/* Common target dependent code for GDB on ARM systems.
- Copyright (C) 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 1988-2014 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include <ctype.h> /* XXX for isupper () */
-
#include "defs.h"
+
+#include <ctype.h> /* XXX for isupper (). */
+
#include "frame.h"
#include "inferior.h"
#include "gdbcmd.h"
#include "gdbcore.h"
-#include "gdb_string.h"
-#include "dis-asm.h" /* For register styles. */
+#include <string.h>
+#include "dis-asm.h" /* For register styles. */
#include "regcache.h"
+#include "reggroups.h"
#include "doublest.h"
#include "value.h"
#include "arch-utils.h"
#include "dwarf2-frame.h"
#include "gdbtypes.h"
#include "prologue-value.h"
+#include "remote.h"
#include "target-descriptions.h"
#include "user-regs.h"
+#include "observer.h"
#include "arm-tdep.h"
#include "gdb/sim-arm.h"
#include "gdb_assert.h"
#include "vec.h"
+#include "record.h"
+#include "record-full.h"
+
#include "features/arm-with-m.c"
+#include "features/arm-with-m-fpa-layout.c"
+#include "features/arm-with-m-vfp-d16.c"
+#include "features/arm-with-iwmmxt.c"
+#include "features/arm-with-vfpv2.c"
+#include "features/arm-with-vfpv3.c"
+#include "features/arm-with-neon.c"
static int arm_debug;
MSYMBOL_SET_SPECIAL Actually sets the "special" bit.
MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */
-#define MSYMBOL_SET_SPECIAL(msym) \
+#define MSYMBOL_SET_SPECIAL(msym) \
MSYMBOL_TARGET_FLAG_1 (msym) = 1
#define MSYMBOL_IS_SPECIAL(msym) \
/* The type of floating-point to use. Keep this in sync with enum
arm_float_model, and the help string in _initialize_arm_tdep. */
-static const char *fp_model_strings[] =
+static const char *const fp_model_strings[] =
{
"auto",
"softfpa",
static const char *current_fp_model = "auto";
/* The ABI to use. Keep this in sync with arm_abi_kind. */
-static const char *arm_abi_strings[] =
+static const char *const arm_abi_strings[] =
{
"auto",
"APCS",
static const char *arm_abi_string = "auto";
/* The execution mode to assume. */
-static const char *arm_mode_strings[] =
+static const char *const arm_mode_strings[] =
{
"auto",
"arm",
static const char *arm_fallback_mode_string = "auto";
static const char *arm_force_mode_string = "auto";
+/* Internal override of the execution mode. -1 means no override,
+ 0 means override to ARM mode, 1 means override to Thumb mode.
+ The effect is the same as if arm_force_mode has been set by the
+ user (except the internal override has precedence over a user's
+ arm_force_mode override). */
+static int arm_override_mode = -1;
+
/* Number of different reg name sets (options). */
static int num_disassembly_options;
-/* The standard register names, and all the valid aliases for them. */
+/* The standard register names, and all the valid aliases for them. Note
+ that `fp', `sp' and `pc' are not added in this alias list, because they
+ have been added as builtin user registers in
+ std-regs.c:_initialize_frame_reg. */
static const struct
{
const char *name;
{ "tr", 9 },
/* Special names. */
{ "ip", 12 },
- { "sp", 13 },
{ "lr", 14 },
- { "pc", 15 },
/* Names used by GCC (not listed in the ARM EABI). */
{ "sl", 10 },
- { "fp", 11 },
/* A special name from the older ATPCS. */
{ "wr", 7 },
};
static void convert_to_extended (const struct floatformat *, void *,
const void *, int);
-static void arm_neon_quad_read (struct gdbarch *gdbarch,
- struct regcache *regcache,
- int regnum, gdb_byte *buf);
+static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ int regnum, gdb_byte *buf);
static void arm_neon_quad_write (struct gdbarch *gdbarch,
struct regcache *regcache,
int regnum, const gdb_byte *buf);
+static int thumb_insn_size (unsigned short inst1);
+
struct arm_prologue_cache
{
/* The stack pointer at the time this frame was created; i.e. the
/* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
-static int
+int
arm_psr_thumb_bit (struct gdbarch *gdbarch)
{
if (gdbarch_tdep (gdbarch)->is_m)
return 0;
}
-static CORE_ADDR arm_get_next_pc_raw (struct frame_info *frame,
- CORE_ADDR pc, int insert_bkpt);
-
/* Determine if the program counter specified in MEMADDR is in a Thumb
function. This function should be called for addresses unrelated to
any executing frame; otherwise, prefer arm_frame_is_thumb. */
-static int
+int
arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr)
{
- struct obj_section *sec;
- struct minimal_symbol *sym;
+ struct bound_minimal_symbol sym;
char type;
+ struct displaced_step_closure* dsc
+ = get_displaced_step_closure_by_addr(memaddr);
+
+ /* If checking the mode of displaced instruction in copy area, the mode
+ should be determined by instruction on the original address. */
+ if (dsc)
+ {
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: check mode of %.8lx instead of %.8lx\n",
+ (unsigned long) dsc->insn_addr,
+ (unsigned long) memaddr);
+ memaddr = dsc->insn_addr;
+ }
/* If bit 0 of the address is set, assume this is a Thumb address. */
if (IS_THUMB_ADDR (memaddr))
return 1;
+ /* Respect internal mode override if active. */
+ if (arm_override_mode != -1)
+ return arm_override_mode;
+
/* If the user wants to override the symbol table, let him. */
if (strcmp (arm_force_mode_string, "arm") == 0)
return 0;
/* Thumb functions have a "special" bit set in minimal symbols. */
sym = lookup_minimal_symbol_by_pc (memaddr);
- if (sym)
- return (MSYMBOL_IS_SPECIAL (sym));
+ if (sym.minsym)
+ return (MSYMBOL_IS_SPECIAL (sym.minsym));
/* If the user wants to override the fallback mode, let them. */
if (strcmp (arm_fallback_mode_string, "arm") == 0)
target, then trust the current value of $cpsr. This lets
"display/i $pc" always show the correct mode (though if there is
a symbol table we will not reach here, so it still may not be
- displayed in the mode it will be executed).
-
- As a further heuristic if we detect that we are doing a single-step we
- see what state executing the current instruction ends up with us being
- in. */
+ displayed in the mode it will be executed). */
if (target_has_registers)
- {
- struct frame_info *current_frame = get_current_frame ();
- CORE_ADDR current_pc = get_frame_pc (current_frame);
- int is_thumb = arm_frame_is_thumb (current_frame);
- CORE_ADDR next_pc;
- if (memaddr == current_pc)
- return is_thumb;
- else
- {
- struct gdbarch *gdbarch = get_frame_arch (current_frame);
- next_pc = arm_get_next_pc_raw (current_frame, current_pc, FALSE);
- if (memaddr == gdbarch_addr_bits_remove (gdbarch, next_pc))
- return IS_THUMB_ADDR (next_pc);
- else
- return is_thumb;
- }
- }
+ return arm_frame_is_thumb (get_current_frame ());
/* Otherwise we're out of luck; we assume ARM. */
return 0;
static CORE_ADDR
arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
{
+ /* On M-profile devices, do not strip the low bit from EXC_RETURN
+ (the magic exception return address). */
+ if (gdbarch_tdep (gdbarch)->is_m
+ && (val & 0xfffffff0) == 0xfffffff0)
+ return val;
+
if (arm_apcs_32)
return UNMAKE_THUMB_ADDR (val);
else
return (val & 0x03fffffc);
}
-/* When reading symbols, we need to zap the low bit of the address,
- which may be set to 1 for Thumb functions. */
-static CORE_ADDR
-arm_smash_text_address (struct gdbarch *gdbarch, CORE_ADDR val)
-{
- return val & ~1;
-}
-
/* Return 1 if PC is the start of a compiler helper function which
- can be safely ignored during prologue skipping. */
+ can be safely ignored during prologue skipping. IS_THUMB is true
+ if the function is known to be a Thumb function due to the way it
+ is being called. */
static int
-skip_prologue_function (CORE_ADDR pc)
+skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb)
{
- struct minimal_symbol *msym;
- const char *name;
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol_by_pc (pc);
- if (msym == NULL || SYMBOL_VALUE_ADDRESS (msym) != pc)
- return 0;
-
- name = SYMBOL_LINKAGE_NAME (msym);
- if (name == NULL)
- return 0;
+ if (msym.minsym != NULL
+ && SYMBOL_VALUE_ADDRESS (msym.minsym) == pc
+ && SYMBOL_LINKAGE_NAME (msym.minsym) != NULL)
+ {
+ const char *name = SYMBOL_LINKAGE_NAME (msym.minsym);
- /* The GNU linker's Thumb call stub to foo is named
- __foo_from_thumb. */
- if (strstr (name, "_from_thumb") != NULL)
- name += 2;
+ /* The GNU linker's Thumb call stub to foo is named
+ __foo_from_thumb. */
+ if (strstr (name, "_from_thumb") != NULL)
+ name += 2;
- /* On soft-float targets, __truncdfsf2 is called to convert promoted
- arguments to their argument types in non-prototyped
- functions. */
- if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0)
- return 1;
- if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0)
- return 1;
+ /* On soft-float targets, __truncdfsf2 is called to convert promoted
+ arguments to their argument types in non-prototyped
+ functions. */
+ if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0)
+ return 1;
+ if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0)
+ return 1;
- /* Internal functions related to thread-local storage. */
- if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0)
- return 1;
- if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0)
- return 1;
+ /* Internal functions related to thread-local storage. */
+ if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0)
+ return 1;
+ if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0)
+ return 1;
+ }
+ else
+ {
+ /* If we run against a stripped glibc, we may be unable to identify
+ special functions by name. Check for one important case,
+ __aeabi_read_tp, by comparing the *code* against the default
+ implementation (this is hand-written ARM assembler in glibc). */
+
+ if (!is_thumb
+ && read_memory_unsigned_integer (pc, 4, byte_order_for_code)
+ == 0xe3e00a0f /* mov r0, #0xffff0fff */
+ && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code)
+ == 0xe240f01f) /* sub pc, r0, #31 */
+ return 1;
+ }
return 0;
}
#define sbits(obj,st,fn) \
((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
#define BranchDest(addr,instr) \
- ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
+ ((CORE_ADDR) (((unsigned long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
+
+/* Extract the immediate from instruction movw/movt of encoding T. INSN1 is
+ the first 16-bit of instruction, and INSN2 is the second 16-bit of
+ instruction. */
+#define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \
+ ((bits ((insn1), 0, 3) << 12) \
+ | (bits ((insn1), 10, 10) << 11) \
+ | (bits ((insn2), 12, 14) << 8) \
+ | bits ((insn2), 0, 7))
+
+/* Extract the immediate from instruction movw/movt of encoding A. INSN is
+ the 32-bit instruction. */
+#define EXTRACT_MOVW_MOVT_IMM_A(insn) \
+ ((bits ((insn), 16, 19) << 12) \
+ | bits ((insn), 0, 11))
/* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */
constant = read_memory_unsigned_integer (loc, 4, byte_order);
regs[bits (insn, 8, 10)] = pv_constant (constant);
}
- else if ((insn & 0xe000) == 0xe000)
+ else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */
{
unsigned short inst2;
if (bit (inst2, 12) == 0)
nextpc = nextpc & 0xfffffffc;
- if (!skip_prologue_function (nextpc))
+ if (!skip_prologue_function (gdbarch, nextpc,
+ bit (inst2, 12) != 0))
break;
}
- else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, { registers } */
+ else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!},
+ { registers } */
&& pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
{
pv_t addr = regs[bits (insn, 0, 3)];
regs[bits (insn, 0, 3)] = addr;
}
- else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, [Rn, #+/-imm]{!} */
+ else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2,
+ [Rn, #+/-imm]{!} */
&& pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
{
int regno1 = bits (inst2, 12, 15);
/* Ignore stores of argument registers to the stack. */
;
- else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], { registers } */
+ else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!],
+ { registers } */
&& (inst2 & 0x8000) == 0x0000
&& pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
/* Ignore block loads from the stack, potentially copying
parameters from memory. */
;
- else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, [Rn, #+/-imm] */
+ else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2,
+ [Rn, #+/-imm] */
&& pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
/* Similarly ignore dual loads from the stack. */
;
else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */
{
- unsigned int imm = ((bits (insn, 0, 3) << 12)
- | (bits (insn, 10, 10) << 11)
- | (bits (inst2, 12, 14) << 8)
- | bits (inst2, 0, 7));
+ unsigned int imm
+ = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2);
regs[bits (inst2, 8, 11)] = pv_constant (imm);
}
cache->framereg = THUMB_FP_REGNUM;
cache->framesize = -regs[THUMB_FP_REGNUM].k;
}
- else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM))
+ else
{
/* Try the stack pointer... this is a bit desperate. */
cache->framereg = ARM_SP_REGNUM;
cache->framesize = -regs[ARM_SP_REGNUM].k;
}
- else
- {
- /* We're just out of luck. We don't know where the frame is. */
- cache->framereg = -1;
- cache->framesize = 0;
- }
for (i = 0; i < 16; i++)
if (pv_area_find_reg (stack, gdbarch, i, &offset))
return unrecognized_pc;
}
+
+/* Try to analyze the instructions starting from PC, which load symbol
+ __stack_chk_guard. Return the address of instruction after loading this
+ symbol, set the dest register number to *BASEREG, and set the size of
+ instructions for loading symbol in OFFSET. Return 0 if instructions are
+ not recognized. */
+
+static CORE_ADDR
+arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch,
+ unsigned int *destreg, int *offset)
+{
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ int is_thumb = arm_pc_is_thumb (gdbarch, pc);
+ unsigned int low, high, address;
+
+ address = 0;
+ if (is_thumb)
+ {
+ unsigned short insn1
+ = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
+
+ if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */
+ {
+ *destreg = bits (insn1, 8, 10);
+ *offset = 2;
+ address = bits (insn1, 0, 7);
+ }
+ else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */
+ {
+ unsigned short insn2
+ = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code);
+
+ low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2);
+
+ insn1
+ = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code);
+ insn2
+ = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code);
+
+ /* movt Rd, #const */
+ if ((insn1 & 0xfbc0) == 0xf2c0)
+ {
+ high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2);
+ *destreg = bits (insn2, 8, 11);
+ *offset = 8;
+ address = (high << 16 | low);
+ }
+ }
+ }
+ else
+ {
+ unsigned int insn
+ = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
+
+ if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */
+ {
+ address = bits (insn, 0, 11);
+ *destreg = bits (insn, 12, 15);
+ *offset = 4;
+ }
+ else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */
+ {
+ low = EXTRACT_MOVW_MOVT_IMM_A (insn);
+
+ insn
+ = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code);
+
+ if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */
+ {
+ high = EXTRACT_MOVW_MOVT_IMM_A (insn);
+ *destreg = bits (insn, 12, 15);
+ *offset = 8;
+ address = (high << 16 | low);
+ }
+ }
+ }
+
+ return address;
+}
+
+/* Try to skip a sequence of instructions used for stack protector. If PC
+ points to the first instruction of this sequence, return the address of
+ first instruction after this sequence, otherwise, return original PC.
+
+ On arm, this sequence of instructions is composed of mainly three steps,
+ Step 1: load symbol __stack_chk_guard,
+ Step 2: load from address of __stack_chk_guard,
+ Step 3: store it to somewhere else.
+
+ Usually, instructions on step 2 and step 3 are the same on various ARM
+ architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and
+ on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However,
+ instructions in step 1 vary from different ARM architectures. On ARMv7,
+ they are,
+
+ movw Rn, #:lower16:__stack_chk_guard
+ movt Rn, #:upper16:__stack_chk_guard
+
+ On ARMv5t, it is,
+
+ ldr Rn, .Label
+ ....
+ .Lable:
+ .word __stack_chk_guard
+
+ Since ldr/str is a very popular instruction, we can't use them as
+ 'fingerprint' or 'signature' of stack protector sequence. Here we choose
+ sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not
+ stripped, as the 'fingerprint' of a stack protector cdoe sequence. */
+
+static CORE_ADDR
+arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch)
+{
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ unsigned int basereg;
+ struct bound_minimal_symbol stack_chk_guard;
+ int offset;
+ int is_thumb = arm_pc_is_thumb (gdbarch, pc);
+ CORE_ADDR addr;
+
+ /* Try to parse the instructions in Step 1. */
+ addr = arm_analyze_load_stack_chk_guard (pc, gdbarch,
+ &basereg, &offset);
+ if (!addr)
+ return pc;
+
+ stack_chk_guard = lookup_minimal_symbol_by_pc (addr);
+ /* If name of symbol doesn't start with '__stack_chk_guard', this
+ instruction sequence is not for stack protector. If symbol is
+ removed, we conservatively think this sequence is for stack protector. */
+ if (stack_chk_guard.minsym
+ && strncmp (SYMBOL_LINKAGE_NAME (stack_chk_guard.minsym),
+ "__stack_chk_guard",
+ strlen ("__stack_chk_guard")) != 0)
+ return pc;
+
+ if (is_thumb)
+ {
+ unsigned int destreg;
+ unsigned short insn
+ = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code);
+
+ /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */
+ if ((insn & 0xf800) != 0x6800)
+ return pc;
+ if (bits (insn, 3, 5) != basereg)
+ return pc;
+ destreg = bits (insn, 0, 2);
+
+ insn = read_memory_unsigned_integer (pc + offset + 2, 2,
+ byte_order_for_code);
+ /* Step 3: str Rd, [Rn, #immed], encoding T1. */
+ if ((insn & 0xf800) != 0x6000)
+ return pc;
+ if (destreg != bits (insn, 0, 2))
+ return pc;
+ }
+ else
+ {
+ unsigned int destreg;
+ unsigned int insn
+ = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code);
+
+ /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */
+ if ((insn & 0x0e500000) != 0x04100000)
+ return pc;
+ if (bits (insn, 16, 19) != basereg)
+ return pc;
+ destreg = bits (insn, 12, 15);
+ /* Step 3: str Rd, [Rn, #immed], encoding A1. */
+ insn = read_memory_unsigned_integer (pc + offset + 4,
+ 4, byte_order_for_code);
+ if ((insn & 0x0e500000) != 0x04000000)
+ return pc;
+ if (bits (insn, 12, 15) != destreg)
+ return pc;
+ }
+ /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8
+ on arm. */
+ if (is_thumb)
+ return pc + offset + 4;
+ else
+ return pc + offset + 8;
+}
+
/* Advance the PC across any function entry prologue instructions to
reach some "real" code.
[stfe f6, [sp, #-12]!]
[stfe f5, [sp, #-12]!]
[stfe f4, [sp, #-12]!]
- sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn */
+ sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */
static CORE_ADDR
arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
unsigned long inst;
CORE_ADDR skip_pc;
CORE_ADDR func_addr, limit_pc;
- struct symtab_and_line sal;
/* See if we can determine the end of the prologue via the symbol table.
If so, then return either PC, or the PC after the prologue, whichever
= skip_prologue_using_sal (gdbarch, func_addr);
struct symtab *s = find_pc_symtab (func_addr);
+ if (post_prologue_pc)
+ post_prologue_pc
+ = arm_skip_stack_protector (post_prologue_pc, gdbarch);
+
+
/* GCC always emits a line note before the prologue and another
one after, even if the two are at the same address or on the
same line. Take advantage of this so that we do not need to
if (post_prologue_pc
&& (s == NULL
|| s->producer == NULL
- || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0))
+ || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0
+ || strncmp (s->producer, "clang ", sizeof ("clang ") - 1) == 0))
return post_prologue_pc;
if (post_prologue_pc != 0)
/* Find an upper limit on the function prologue using the debug
information. If the debug information could not be used to provide
that bound, then use an arbitrary large number as the upper bound. */
- /* Like arm_scan_prologue, stop no later than pc + 64. */
+ /* Like arm_scan_prologue, stop no later than pc + 64. */
limit_pc = skip_prologue_using_sal (gdbarch, pc);
if (limit_pc == 0)
limit_pc = pc + 64; /* Magic. */
break;
}
- return skip_pc; /* End of prologue */
+ return skip_pc; /* End of prologue. */
}
/* *INDENT-OFF* */
R7 -> 0 local variables (16 bytes)
SP -> -12 additional stack space (12 bytes)
The frame size would thus be 36 bytes, and the frame offset would be
- 12 bytes. The frame register is R7.
+ 12 bytes. The frame register is R7.
The comments for thumb_skip_prolog() describe the algorithm we use
to detect the end of the prolog. */
{
CORE_ADDR prologue_start;
CORE_ADDR prologue_end;
- CORE_ADDR current_pc;
if (find_pc_partial_function (block_addr, NULL, &prologue_start,
&prologue_end))
return 0;
default:
- internal_error (__FILE__, __LINE__, "bad value in switch");
+ internal_error (__FILE__, __LINE__, _("bad value in switch"));
}
}
regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm);
continue;
}
- else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, [sp, #-4]! */
+ else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd,
+ [sp, #-4]! */
{
if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
break;
for (regno = ARM_PC_REGNUM; regno >= 0; regno--)
if (mask & (1 << regno))
{
- regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4);
+ regs[ARM_SP_REGNUM]
+ = pv_add_constant (regs[ARM_SP_REGNUM], -4);
pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]);
}
}
/* No need to add this to saved_regs -- it's just an arg reg. */
continue;
}
- else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, { registers } */
+ else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn,
+ { registers } */
&& pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM))
{
/* No need to add this to saved_regs -- it's just arg regs. */
imm = (imm >> rot) | (imm << (32 - rot));
regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm);
}
- else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, [sp, -#c]! */
+ else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?,
+ [sp, -#c]! */
&& gdbarch_tdep (gdbarch)->have_fpa_registers)
{
if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM]))
regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07);
pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]);
}
- else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, [sp!] */
+ else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4,
+ [sp!] */
&& gdbarch_tdep (gdbarch)->have_fpa_registers)
{
int n_saved_fp_regs;
the stack. */
CORE_ADDR dest = BranchDest (current_pc, insn);
- if (skip_prologue_function (dest))
+ if (skip_prologue_function (gdbarch, dest, 0))
continue;
else
break;
}
else if ((insn & 0xf0000000) != 0xe0000000)
- break; /* Condition not true, exit early */
+ break; /* Condition not true, exit early. */
else if (arm_instruction_changes_pc (insn))
/* Don't scan past anything that might change control flow. */
break;
- else if ((insn & 0xfe500000) == 0xe8100000) /* ldm */
- {
- /* Ignore block loads from the stack, potentially copying
- parameters from memory. */
- if (pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM))
- continue;
- else
- break;
- }
- else if ((insn & 0xfc500000) == 0xe4100000)
- {
- /* Similarly ignore single loads from the stack. */
- if (pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM))
- continue;
- else
- break;
- }
+ else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */
+ && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM))
+ /* Ignore block loads from the stack, potentially copying
+ parameters from memory. */
+ continue;
+ else if ((insn & 0xfc500000) == 0xe4100000
+ && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM))
+ /* Similarly ignore single loads from the stack. */
+ continue;
else if ((insn & 0xffff0ff0) == 0xe1a00000)
/* MOV Rd, Rm. Skip register copies, i.e. saves to another
register instead of the stack. */
framereg = ARM_FP_REGNUM;
framesize = -regs[ARM_FP_REGNUM].k;
}
- else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM))
+ else
{
/* Try the stack pointer... this is a bit desperate. */
framereg = ARM_SP_REGNUM;
framesize = -regs[ARM_SP_REGNUM].k;
}
- else
- {
- /* We're just out of luck. We don't know where the frame is. */
- framereg = -1;
- framesize = 0;
- }
if (cache)
{
if (cache->prev_sp == 0)
return;
+ /* Use function start address as part of the frame ID. If we cannot
+ identify the start address (due to missing symbol information),
+ fall back to just using the current PC. */
func = get_frame_func (this_frame);
+ if (!func)
+ func = pc;
+
id = frame_id_build (cache->prev_sp, func);
*this_id = id;
}
struct frame_unwind arm_prologue_unwind = {
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
arm_prologue_this_id,
arm_prologue_prev_register,
NULL,
default_frame_sniffer
};
-static struct arm_prologue_cache *
-arm_make_stub_cache (struct frame_info *this_frame)
-{
- struct arm_prologue_cache *cache;
-
- cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache);
- cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+/* Maintain a list of ARM exception table entries per objfile, similar to the
+ list of mapping symbols. We only cache entries for standard ARM-defined
+ personality routines; the cache will contain only the frame unwinding
+ instructions associated with the entry (not the descriptors). */
- cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
+static const struct objfile_data *arm_exidx_data_key;
- return cache;
-}
+struct arm_exidx_entry
+{
+ bfd_vma addr;
+ gdb_byte *entry;
+};
+typedef struct arm_exidx_entry arm_exidx_entry_s;
+DEF_VEC_O(arm_exidx_entry_s);
-/* Our frame ID for a stub frame is the current SP and LR. */
+struct arm_exidx_data
+{
+ VEC(arm_exidx_entry_s) **section_maps;
+};
static void
-arm_stub_this_id (struct frame_info *this_frame,
- void **this_cache,
- struct frame_id *this_id)
+arm_exidx_data_free (struct objfile *objfile, void *arg)
{
- struct arm_prologue_cache *cache;
-
- if (*this_cache == NULL)
- *this_cache = arm_make_stub_cache (this_frame);
- cache = *this_cache;
+ struct arm_exidx_data *data = arg;
+ unsigned int i;
- *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame));
+ for (i = 0; i < objfile->obfd->section_count; i++)
+ VEC_free (arm_exidx_entry_s, data->section_maps[i]);
}
-static int
-arm_stub_unwind_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame,
- void **this_prologue_cache)
+static inline int
+arm_compare_exidx_entries (const struct arm_exidx_entry *lhs,
+ const struct arm_exidx_entry *rhs)
{
- CORE_ADDR addr_in_block;
- char dummy[4];
-
- addr_in_block = get_frame_address_in_block (this_frame);
- if (in_plt_section (addr_in_block, NULL)
- /* We also use the stub winder if the target memory is unreadable
- to avoid having the prologue unwinder trying to read it. */
- || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0)
- return 1;
-
- return 0;
+ return lhs->addr < rhs->addr;
}
-struct frame_unwind arm_stub_unwind = {
- NORMAL_FRAME,
- arm_stub_this_id,
- arm_prologue_prev_register,
- NULL,
- arm_stub_unwind_sniffer
-};
-
-static CORE_ADDR
-arm_normal_frame_base (struct frame_info *this_frame, void **this_cache)
+static struct obj_section *
+arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma)
{
- struct arm_prologue_cache *cache;
+ struct obj_section *osect;
- if (*this_cache == NULL)
- *this_cache = arm_make_prologue_cache (this_frame);
- cache = *this_cache;
+ ALL_OBJFILE_OSECTIONS (objfile, osect)
+ if (bfd_get_section_flags (objfile->obfd,
+ osect->the_bfd_section) & SEC_ALLOC)
+ {
+ bfd_vma start, size;
+ start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section);
+ size = bfd_get_section_size (osect->the_bfd_section);
- return cache->prev_sp - cache->framesize;
+ if (start <= vma && vma < start + size)
+ return osect;
+ }
+
+ return NULL;
}
-struct frame_base arm_normal_base = {
- &arm_prologue_unwind,
- arm_normal_frame_base,
- arm_normal_frame_base,
- arm_normal_frame_base
-};
+/* Parse contents of exception table and exception index sections
+ of OBJFILE, and fill in the exception table entry cache.
-/* Assuming THIS_FRAME is a dummy, return the frame ID of that
- dummy frame. The frame ID's base needs to match the TOS value
- saved by save_dummy_frame_tos() and returned from
- arm_push_dummy_call, and the PC needs to match the dummy frame's
- breakpoint. */
+ For each entry that refers to a standard ARM-defined personality
+ routine, extract the frame unwinding instructions (from either
+ the index or the table section). The unwinding instructions
+ are normalized by:
+ - extracting them from the rest of the table data
+ - converting to host endianness
+ - appending the implicit 0xb0 ("Finish") code
-static struct frame_id
-arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
- return frame_id_build (get_frame_register_unsigned (this_frame, ARM_SP_REGNUM),
- get_frame_pc (this_frame));
-}
+ The extracted and normalized instructions are stored for later
+ retrieval by the arm_find_exidx_entry routine. */
+
+static void
+arm_exidx_new_objfile (struct objfile *objfile)
+{
+ struct cleanup *cleanups;
+ struct arm_exidx_data *data;
+ asection *exidx, *extab;
+ bfd_vma exidx_vma = 0, extab_vma = 0;
+ bfd_size_type exidx_size = 0, extab_size = 0;
+ gdb_byte *exidx_data = NULL, *extab_data = NULL;
+ LONGEST i;
+
+ /* If we've already touched this file, do nothing. */
+ if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL)
+ return;
+ cleanups = make_cleanup (null_cleanup, NULL);
-/* Given THIS_FRAME, find the previous frame's resume PC (which will
- be used to construct the previous frame's ID, after looking up the
- containing function). */
+ /* Read contents of exception table and index. */
+ exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx");
+ if (exidx)
+ {
+ exidx_vma = bfd_section_vma (objfile->obfd, exidx);
+ exidx_size = bfd_get_section_size (exidx);
+ exidx_data = xmalloc (exidx_size);
+ make_cleanup (xfree, exidx_data);
-static CORE_ADDR
-arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
- CORE_ADDR pc;
- pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM);
- return arm_addr_bits_remove (gdbarch, pc);
-}
+ if (!bfd_get_section_contents (objfile->obfd, exidx,
+ exidx_data, 0, exidx_size))
+ {
+ do_cleanups (cleanups);
+ return;
+ }
+ }
-static CORE_ADDR
-arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
- return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM);
-}
+ extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab");
+ if (extab)
+ {
+ extab_vma = bfd_section_vma (objfile->obfd, extab);
+ extab_size = bfd_get_section_size (extab);
+ extab_data = xmalloc (extab_size);
+ make_cleanup (xfree, extab_data);
-static struct value *
-arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
- int regnum)
-{
- struct gdbarch * gdbarch = get_frame_arch (this_frame);
- CORE_ADDR lr, cpsr;
- ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
+ if (!bfd_get_section_contents (objfile->obfd, extab,
+ extab_data, 0, extab_size))
+ {
+ do_cleanups (cleanups);
+ return;
+ }
+ }
- switch (regnum)
+ /* Allocate exception table data structure. */
+ data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data);
+ set_objfile_data (objfile, arm_exidx_data_key, data);
+ data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack,
+ objfile->obfd->section_count,
+ VEC(arm_exidx_entry_s) *);
+
+ /* Fill in exception table. */
+ for (i = 0; i < exidx_size / 8; i++)
{
- case ARM_PC_REGNUM:
- /* The PC is normally copied from the return column, which
- describes saves of LR. However, that version may have an
- extra bit set to indicate Thumb state. The bit is not
- part of the PC. */
- lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM);
- return frame_unwind_got_constant (this_frame, regnum,
- arm_addr_bits_remove (gdbarch, lr));
+ struct arm_exidx_entry new_exidx_entry;
+ bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8);
+ bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4);
+ bfd_vma addr = 0, word = 0;
+ int n_bytes = 0, n_words = 0;
+ struct obj_section *sec;
+ gdb_byte *entry = NULL;
- case ARM_PS_REGNUM:
- /* Reconstruct the T bit; see arm_prologue_prev_register for details. */
- cpsr = get_frame_register_unsigned (this_frame, regnum);
- lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM);
- if (IS_THUMB_ADDR (lr))
- cpsr |= t_bit;
- else
- cpsr &= ~t_bit;
- return frame_unwind_got_constant (this_frame, regnum, cpsr);
+ /* Extract address of start of function. */
+ idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000;
+ idx += exidx_vma + i * 8;
- default:
- internal_error (__FILE__, __LINE__,
- _("Unexpected register %d"), regnum);
+ /* Find section containing function and compute section offset. */
+ sec = arm_obj_section_from_vma (objfile, idx);
+ if (sec == NULL)
+ continue;
+ idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section);
+
+ /* Determine address of exception table entry. */
+ if (val == 1)
+ {
+ /* EXIDX_CANTUNWIND -- no exception table entry present. */
+ }
+ else if ((val & 0xff000000) == 0x80000000)
+ {
+ /* Exception table entry embedded in .ARM.exidx
+ -- must be short form. */
+ word = val;
+ n_bytes = 3;
+ }
+ else if (!(val & 0x80000000))
+ {
+ /* Exception table entry in .ARM.extab. */
+ addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000;
+ addr += exidx_vma + i * 8 + 4;
+
+ if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size)
+ {
+ word = bfd_h_get_32 (objfile->obfd,
+ extab_data + addr - extab_vma);
+ addr += 4;
+
+ if ((word & 0xff000000) == 0x80000000)
+ {
+ /* Short form. */
+ n_bytes = 3;
+ }
+ else if ((word & 0xff000000) == 0x81000000
+ || (word & 0xff000000) == 0x82000000)
+ {
+ /* Long form. */
+ n_bytes = 2;
+ n_words = ((word >> 16) & 0xff);
+ }
+ else if (!(word & 0x80000000))
+ {
+ bfd_vma pers;
+ struct obj_section *pers_sec;
+ int gnu_personality = 0;
+
+ /* Custom personality routine. */
+ pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000;
+ pers = UNMAKE_THUMB_ADDR (pers + addr - 4);
+
+ /* Check whether we've got one of the variants of the
+ GNU personality routines. */
+ pers_sec = arm_obj_section_from_vma (objfile, pers);
+ if (pers_sec)
+ {
+ static const char *personality[] =
+ {
+ "__gcc_personality_v0",
+ "__gxx_personality_v0",
+ "__gcj_personality_v0",
+ "__gnu_objc_personality_v0",
+ NULL
+ };
+
+ CORE_ADDR pc = pers + obj_section_offset (pers_sec);
+ int k;
+
+ for (k = 0; personality[k]; k++)
+ if (lookup_minimal_symbol_by_pc_name
+ (pc, personality[k], objfile))
+ {
+ gnu_personality = 1;
+ break;
+ }
+ }
+
+ /* If so, the next word contains a word count in the high
+ byte, followed by the same unwind instructions as the
+ pre-defined forms. */
+ if (gnu_personality
+ && addr + 4 <= extab_vma + extab_size)
+ {
+ word = bfd_h_get_32 (objfile->obfd,
+ extab_data + addr - extab_vma);
+ addr += 4;
+ n_bytes = 3;
+ n_words = ((word >> 24) & 0xff);
+ }
+ }
+ }
+ }
+
+ /* Sanity check address. */
+ if (n_words)
+ if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size)
+ n_words = n_bytes = 0;
+
+ /* The unwind instructions reside in WORD (only the N_BYTES least
+ significant bytes are valid), followed by N_WORDS words in the
+ extab section starting at ADDR. */
+ if (n_bytes || n_words)
+ {
+ gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack,
+ n_bytes + n_words * 4 + 1);
+
+ while (n_bytes--)
+ *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff);
+
+ while (n_words--)
+ {
+ word = bfd_h_get_32 (objfile->obfd,
+ extab_data + addr - extab_vma);
+ addr += 4;
+
+ *p++ = (gdb_byte) ((word >> 24) & 0xff);
+ *p++ = (gdb_byte) ((word >> 16) & 0xff);
+ *p++ = (gdb_byte) ((word >> 8) & 0xff);
+ *p++ = (gdb_byte) (word & 0xff);
+ }
+
+ /* Implied "Finish" to terminate the list. */
+ *p++ = 0xb0;
+ }
+
+ /* Push entry onto vector. They are guaranteed to always
+ appear in order of increasing addresses. */
+ new_exidx_entry.addr = idx;
+ new_exidx_entry.entry = entry;
+ VEC_safe_push (arm_exidx_entry_s,
+ data->section_maps[sec->the_bfd_section->index],
+ &new_exidx_entry);
}
+
+ do_cleanups (cleanups);
}
-static void
-arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
- struct dwarf2_frame_state_reg *reg,
- struct frame_info *this_frame)
+/* Search for the exception table entry covering MEMADDR. If one is found,
+ return a pointer to its data. Otherwise, return 0. If START is non-NULL,
+ set *START to the start of the region covered by this entry. */
+
+static gdb_byte *
+arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start)
{
- switch (regnum)
+ struct obj_section *sec;
+
+ sec = find_pc_section (memaddr);
+ if (sec != NULL)
{
- case ARM_PC_REGNUM:
- case ARM_PS_REGNUM:
- reg->how = DWARF2_FRAME_REG_FN;
- reg->loc.fn = arm_dwarf2_prev_register;
- break;
- case ARM_SP_REGNUM:
- reg->how = DWARF2_FRAME_REG_CFA;
- break;
+ struct arm_exidx_data *data;
+ VEC(arm_exidx_entry_s) *map;
+ struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 };
+ unsigned int idx;
+
+ data = objfile_data (sec->objfile, arm_exidx_data_key);
+ if (data != NULL)
+ {
+ map = data->section_maps[sec->the_bfd_section->index];
+ if (!VEC_empty (arm_exidx_entry_s, map))
+ {
+ struct arm_exidx_entry *map_sym;
+
+ idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key,
+ arm_compare_exidx_entries);
+
+ /* VEC_lower_bound finds the earliest ordered insertion
+ point. If the following symbol starts at this exact
+ address, we use that; otherwise, the preceding
+ exception table entry covers this address. */
+ if (idx < VEC_length (arm_exidx_entry_s, map))
+ {
+ map_sym = VEC_index (arm_exidx_entry_s, map, idx);
+ if (map_sym->addr == map_key.addr)
+ {
+ if (start)
+ *start = map_sym->addr + obj_section_addr (sec);
+ return map_sym->entry;
+ }
+ }
+
+ if (idx > 0)
+ {
+ map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1);
+ if (start)
+ *start = map_sym->addr + obj_section_addr (sec);
+ return map_sym->entry;
+ }
+ }
+ }
}
+
+ return NULL;
}
-/* Return true if we are in the function's epilogue, i.e. after the
- instruction that destroyed the function's stack frame. */
+/* Given the current frame THIS_FRAME, and its associated frame unwinding
+ instruction list from the ARM exception table entry ENTRY, allocate and
+ return a prologue cache structure describing how to unwind this frame.
-static int
-thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+ Return NULL if the unwinding instruction list contains a "spare",
+ "reserved" or "refuse to unwind" instruction as defined in section
+ "9.3 Frame unwinding instructions" of the "Exception Handling ABI
+ for the ARM Architecture" document. */
+
+static struct arm_prologue_cache *
+arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry)
{
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- unsigned int insn, insn2;
- int found_return = 0, found_stack_adjust = 0;
- CORE_ADDR func_start, func_end;
- CORE_ADDR scan_pc;
- gdb_byte buf[4];
+ CORE_ADDR vsp = 0;
+ int vsp_valid = 0;
- if (!find_pc_partial_function (pc, NULL, &func_start, &func_end))
- return 0;
+ struct arm_prologue_cache *cache;
+ cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- /* The epilogue is a sequence of instructions along the following lines:
+ for (;;)
+ {
+ gdb_byte insn;
- - add stack frame size to SP or FP
- - [if frame pointer used] restore SP from FP
- - restore registers from SP [may include PC]
- - a return-type instruction [if PC wasn't already restored]
+ /* Whenever we reload SP, we actually have to retrieve its
+ actual value in the current frame. */
+ if (!vsp_valid)
+ {
+ if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM))
+ {
+ int reg = cache->saved_regs[ARM_SP_REGNUM].realreg;
+ vsp = get_frame_register_unsigned (this_frame, reg);
+ }
+ else
+ {
+ CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr;
+ vsp = get_frame_memory_unsigned (this_frame, addr, 4);
+ }
- In a first pass, we scan forward from the current PC and verify the
- instructions we find as compatible with this sequence, ending in a
- return instruction.
+ vsp_valid = 1;
+ }
- However, this is not sufficient to distinguish indirect function calls
- within a function from indirect tail calls in the epilogue in some cases.
- Therefore, if we didn't already find any SP-changing instruction during
- forward scan, we add a backward scanning heuristic to ensure we actually
- are in the epilogue. */
+ /* Decode next unwind instruction. */
+ insn = *entry++;
- scan_pc = pc;
- while (scan_pc < func_end && !found_return)
- {
- if (target_read_memory (scan_pc, buf, 2))
- break;
+ if ((insn & 0xc0) == 0)
+ {
+ int offset = insn & 0x3f;
+ vsp += (offset << 2) + 4;
+ }
+ else if ((insn & 0xc0) == 0x40)
+ {
+ int offset = insn & 0x3f;
+ vsp -= (offset << 2) + 4;
+ }
+ else if ((insn & 0xf0) == 0x80)
+ {
+ int mask = ((insn & 0xf) << 8) | *entry++;
+ int i;
- scan_pc += 2;
- insn = extract_unsigned_integer (buf, 2, byte_order_for_code);
+ /* The special case of an all-zero mask identifies
+ "Refuse to unwind". We return NULL to fall back
+ to the prologue analyzer. */
+ if (mask == 0)
+ return NULL;
- if ((insn & 0xff80) == 0x4700) /* bx <Rm> */
- found_return = 1;
- else if (insn == 0x46f7) /* mov pc, lr */
- found_return = 1;
- else if (insn == 0x46bd) /* mov sp, r7 */
- found_stack_adjust = 1;
- else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */
- found_stack_adjust = 1;
- else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */
- {
- found_stack_adjust = 1;
- if (insn & 0x0100) /* <registers> include PC. */
- found_return = 1;
+ /* Pop registers r4..r15 under mask. */
+ for (i = 0; i < 12; i++)
+ if (mask & (1 << i))
+ {
+ cache->saved_regs[4 + i].addr = vsp;
+ vsp += 4;
+ }
+
+ /* Special-case popping SP -- we need to reload vsp. */
+ if (mask & (1 << (ARM_SP_REGNUM - 4)))
+ vsp_valid = 0;
}
- else if ((insn & 0xe000) == 0xe000) /* 32-bit Thumb-2 instruction */
+ else if ((insn & 0xf0) == 0x90)
{
- if (target_read_memory (scan_pc, buf, 2))
- break;
+ int reg = insn & 0xf;
- scan_pc += 2;
- insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code);
+ /* Reserved cases. */
+ if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM)
+ return NULL;
- if (insn == 0xe8bd) /* ldm.w sp!, <registers> */
+ /* Set SP from another register and mark VSP for reload. */
+ cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg];
+ vsp_valid = 0;
+ }
+ else if ((insn & 0xf0) == 0xa0)
+ {
+ int count = insn & 0x7;
+ int pop_lr = (insn & 0x8) != 0;
+ int i;
+
+ /* Pop r4..r[4+count]. */
+ for (i = 0; i <= count; i++)
{
- found_stack_adjust = 1;
- if (insn2 & 0x8000) /* <registers> include PC. */
- found_return = 1;
+ cache->saved_regs[4 + i].addr = vsp;
+ vsp += 4;
}
- else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */
- && (insn2 & 0x0fff) == 0x0b04)
+
+ /* If indicated by flag, pop LR as well. */
+ if (pop_lr)
{
- found_stack_adjust = 1;
- if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */
- found_return = 1;
+ cache->saved_regs[ARM_LR_REGNUM].addr = vsp;
+ vsp += 4;
}
- else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */
- && (insn2 & 0x0e00) == 0x0a00)
- found_stack_adjust = 1;
- else
- break;
}
- else
- break;
- }
+ else if (insn == 0xb0)
+ {
+ /* We could only have updated PC by popping into it; if so, it
+ will show up as address. Otherwise, copy LR into PC. */
+ if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM))
+ cache->saved_regs[ARM_PC_REGNUM]
+ = cache->saved_regs[ARM_LR_REGNUM];
- if (!found_return)
- return 0;
+ /* We're done. */
+ break;
+ }
+ else if (insn == 0xb1)
+ {
+ int mask = *entry++;
+ int i;
- /* Since any instruction in the epilogue sequence, with the possible
- exception of return itself, updates the stack pointer, we need to
- scan backwards for at most one instruction. Try either a 16-bit or
- a 32-bit instruction. This is just a heuristic, so we do not worry
- too much about false positives.*/
+ /* All-zero mask and mask >= 16 is "spare". */
+ if (mask == 0 || mask >= 16)
+ return NULL;
- if (!found_stack_adjust)
- {
- if (pc - 4 < func_start)
- return 0;
- if (target_read_memory (pc - 4, buf, 4))
- return 0;
+ /* Pop r0..r3 under mask. */
+ for (i = 0; i < 4; i++)
+ if (mask & (1 << i))
+ {
+ cache->saved_regs[i].addr = vsp;
+ vsp += 4;
+ }
+ }
+ else if (insn == 0xb2)
+ {
+ ULONGEST offset = 0;
+ unsigned shift = 0;
- insn = extract_unsigned_integer (buf, 2, byte_order_for_code);
- insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code);
+ do
+ {
+ offset |= (*entry & 0x7f) << shift;
+ shift += 7;
+ }
+ while (*entry++ & 0x80);
- if (insn2 == 0x46bd) /* mov sp, r7 */
- found_stack_adjust = 1;
- else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */
- found_stack_adjust = 1;
- else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */
- found_stack_adjust = 1;
- else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */
- found_stack_adjust = 1;
- else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */
- && (insn2 & 0x0fff) == 0x0b04)
- found_stack_adjust = 1;
- else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */
- && (insn2 & 0x0e00) == 0x0a00)
- found_stack_adjust = 1;
- }
+ vsp += 0x204 + (offset << 2);
+ }
+ else if (insn == 0xb3)
+ {
+ int start = *entry >> 4;
+ int count = (*entry++) & 0xf;
+ int i;
- return found_stack_adjust;
-}
+ /* Only registers D0..D15 are valid here. */
+ if (start + count >= 16)
+ return NULL;
-/* Return true if we are in the function's epilogue, i.e. after the
- instruction that destroyed the function's stack frame. */
+ /* Pop VFP double-precision registers D[start]..D[start+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp;
+ vsp += 8;
+ }
-static int
-arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
-{
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- unsigned int insn;
- int found_return, found_stack_adjust;
- CORE_ADDR func_start, func_end;
+ /* Add an extra 4 bytes for FSTMFDX-style stack. */
+ vsp += 4;
+ }
+ else if ((insn & 0xf8) == 0xb8)
+ {
+ int count = insn & 0x7;
+ int i;
- if (arm_pc_is_thumb (gdbarch, pc))
- return thumb_in_function_epilogue_p (gdbarch, pc);
+ /* Pop VFP double-precision registers D[8]..D[8+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp;
+ vsp += 8;
+ }
- if (!find_pc_partial_function (pc, NULL, &func_start, &func_end))
- return 0;
+ /* Add an extra 4 bytes for FSTMFDX-style stack. */
+ vsp += 4;
+ }
+ else if (insn == 0xc6)
+ {
+ int start = *entry >> 4;
+ int count = (*entry++) & 0xf;
+ int i;
- /* We are in the epilogue if the previous instruction was a stack
- adjustment and the next instruction is a possible return (bx, mov
- pc, or pop). We could have to scan backwards to find the stack
- adjustment, or forwards to find the return, but this is a decent
- approximation. First scan forwards. */
+ /* Only registers WR0..WR15 are valid. */
+ if (start + count >= 16)
+ return NULL;
- found_return = 0;
- insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
- if (bits (insn, 28, 31) != INST_NV)
- {
- if ((insn & 0x0ffffff0) == 0x012fff10)
- /* BX. */
- found_return = 1;
- else if ((insn & 0x0ffffff0) == 0x01a0f000)
- /* MOV PC. */
- found_return = 1;
- else if ((insn & 0x0fff0000) == 0x08bd0000
- && (insn & 0x0000c000) != 0)
- /* POP (LDMIA), including PC or LR. */
- found_return = 1;
+ /* Pop iwmmx registers WR[start]..WR[start+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp;
+ vsp += 8;
+ }
+ }
+ else if (insn == 0xc7)
+ {
+ int mask = *entry++;
+ int i;
+
+ /* All-zero mask and mask >= 16 is "spare". */
+ if (mask == 0 || mask >= 16)
+ return NULL;
+
+ /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */
+ for (i = 0; i < 4; i++)
+ if (mask & (1 << i))
+ {
+ cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp;
+ vsp += 4;
+ }
+ }
+ else if ((insn & 0xf8) == 0xc0)
+ {
+ int count = insn & 0x7;
+ int i;
+
+ /* Pop iwmmx registers WR[10]..WR[10+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp;
+ vsp += 8;
+ }
+ }
+ else if (insn == 0xc8)
+ {
+ int start = *entry >> 4;
+ int count = (*entry++) & 0xf;
+ int i;
+
+ /* Only registers D0..D31 are valid. */
+ if (start + count >= 16)
+ return NULL;
+
+ /* Pop VFP double-precision registers
+ D[16+start]..D[16+start+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp;
+ vsp += 8;
+ }
+ }
+ else if (insn == 0xc9)
+ {
+ int start = *entry >> 4;
+ int count = (*entry++) & 0xf;
+ int i;
+
+ /* Pop VFP double-precision registers D[start]..D[start+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp;
+ vsp += 8;
+ }
+ }
+ else if ((insn & 0xf8) == 0xd0)
+ {
+ int count = insn & 0x7;
+ int i;
+
+ /* Pop VFP double-precision registers D[8]..D[8+count]. */
+ for (i = 0; i <= count; i++)
+ {
+ cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp;
+ vsp += 8;
+ }
+ }
+ else
+ {
+ /* Everything else is "spare". */
+ return NULL;
+ }
}
- if (!found_return)
- return 0;
+ /* If we restore SP from a register, assume this was the frame register.
+ Otherwise just fall back to SP as frame register. */
+ if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM))
+ cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg;
+ else
+ cache->framereg = ARM_SP_REGNUM;
- /* Scan backwards. This is just a heuristic, so do not worry about
- false positives from mode changes. */
+ /* Determine offset to previous frame. */
+ cache->framesize
+ = vsp - get_frame_register_unsigned (this_frame, cache->framereg);
- if (pc < func_start + 4)
+ /* We already got the previous SP. */
+ cache->prev_sp = vsp;
+
+ return cache;
+}
+
+/* Unwinding via ARM exception table entries. Note that the sniffer
+ already computes a filled-in prologue cache, which is then used
+ with the same arm_prologue_this_id and arm_prologue_prev_register
+ routines also used for prologue-parsing based unwinding. */
+
+static int
+arm_exidx_unwind_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ CORE_ADDR addr_in_block, exidx_region, func_start;
+ struct arm_prologue_cache *cache;
+ gdb_byte *entry;
+
+ /* See if we have an ARM exception table entry covering this address. */
+ addr_in_block = get_frame_address_in_block (this_frame);
+ entry = arm_find_exidx_entry (addr_in_block, &exidx_region);
+ if (!entry)
return 0;
- insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code);
- if (bits (insn, 28, 31) != INST_NV)
+ /* The ARM exception table does not describe unwind information
+ for arbitrary PC values, but is guaranteed to be correct only
+ at call sites. We have to decide here whether we want to use
+ ARM exception table information for this frame, or fall back
+ to using prologue parsing. (Note that if we have DWARF CFI,
+ this sniffer isn't even called -- CFI is always preferred.)
+
+ Before we make this decision, however, we check whether we
+ actually have *symbol* information for the current frame.
+ If not, prologue parsing would not work anyway, so we might
+ as well use the exception table and hope for the best. */
+ if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL))
{
- if ((insn & 0x0df0f000) == 0x0080d000)
- /* ADD SP (register or immediate). */
- found_stack_adjust = 1;
- else if ((insn & 0x0df0f000) == 0x0040d000)
- /* SUB SP (register or immediate). */
- found_stack_adjust = 1;
- else if ((insn & 0x0ffffff0) == 0x01a0d000)
- /* MOV SP. */
- found_return = 1;
- else if ((insn & 0x0fff0000) == 0x08bd0000)
- /* POP (LDMIA). */
- found_stack_adjust = 1;
- }
+ int exc_valid = 0;
+
+ /* If the next frame is "normal", we are at a call site in this
+ frame, so exception information is guaranteed to be valid. */
+ if (get_next_frame (this_frame)
+ && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
+ exc_valid = 1;
+
+ /* We also assume exception information is valid if we're currently
+ blocked in a system call. The system library is supposed to
+ ensure this, so that e.g. pthread cancellation works. */
+ if (arm_frame_is_thumb (this_frame))
+ {
+ LONGEST insn;
- if (found_stack_adjust)
- return 1;
+ if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2,
+ byte_order_for_code, &insn)
+ && (insn & 0xff00) == 0xdf00 /* svc */)
+ exc_valid = 1;
+ }
+ else
+ {
+ LONGEST insn;
- return 0;
-}
+ if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4,
+ byte_order_for_code, &insn)
+ && (insn & 0x0f000000) == 0x0f000000 /* svc */)
+ exc_valid = 1;
+ }
+
+ /* Bail out if we don't know that exception information is valid. */
+ if (!exc_valid)
+ return 0;
+ /* The ARM exception index does not mark the *end* of the region
+ covered by the entry, and some functions will not have any entry.
+ To correctly recognize the end of the covered region, the linker
+ should have inserted dummy records with a CANTUNWIND marker.
+
+ Unfortunately, current versions of GNU ld do not reliably do
+ this, and thus we may have found an incorrect entry above.
+ As a (temporary) sanity check, we only use the entry if it
+ lies *within* the bounds of the function. Note that this check
+ might reject perfectly valid entries that just happen to cover
+ multiple functions; therefore this check ought to be removed
+ once the linker is fixed. */
+ if (func_start > exidx_region)
+ return 0;
+ }
-/* When arguments must be pushed onto the stack, they go on in reverse
- order. The code below implements a FILO (stack) to do this. */
+ /* Decode the list of unwinding instructions into a prologue cache.
+ Note that this may fail due to e.g. a "refuse to unwind" code. */
+ cache = arm_exidx_fill_cache (this_frame, entry);
+ if (!cache)
+ return 0;
-struct stack_item
-{
- int len;
- struct stack_item *prev;
- void *data;
+ *this_prologue_cache = cache;
+ return 1;
+}
+
+struct frame_unwind arm_exidx_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ arm_prologue_this_id,
+ arm_prologue_prev_register,
+ NULL,
+ arm_exidx_unwind_sniffer
};
-static struct stack_item *
-push_stack_item (struct stack_item *prev, const void *contents, int len)
+static struct arm_prologue_cache *
+arm_make_stub_cache (struct frame_info *this_frame)
{
- struct stack_item *si;
- si = xmalloc (sizeof (struct stack_item));
- si->data = xmalloc (len);
- si->len = len;
- si->prev = prev;
- memcpy (si->data, contents, len);
- return si;
+ struct arm_prologue_cache *cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
+
+ return cache;
}
-static struct stack_item *
-pop_stack_item (struct stack_item *si)
+/* Our frame ID for a stub frame is the current SP and LR. */
+
+static void
+arm_stub_this_id (struct frame_info *this_frame,
+ void **this_cache,
+ struct frame_id *this_id)
{
- struct stack_item *dead = si;
- si = si->prev;
- xfree (dead->data);
- xfree (dead);
- return si;
-}
+ struct arm_prologue_cache *cache;
+ if (*this_cache == NULL)
+ *this_cache = arm_make_stub_cache (this_frame);
+ cache = *this_cache;
-/* Return the alignment (in bytes) of the given type. */
+ *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame));
+}
static int
-arm_type_align (struct type *t)
+arm_stub_unwind_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- int n;
- int align;
- int falign;
+ CORE_ADDR addr_in_block;
+ gdb_byte dummy[4];
- t = check_typedef (t);
- switch (TYPE_CODE (t))
- {
- default:
- /* Should never happen. */
- internal_error (__FILE__, __LINE__, _("unknown type alignment"));
- return 4;
+ addr_in_block = get_frame_address_in_block (this_frame);
+ if (in_plt_section (addr_in_block)
+ /* We also use the stub winder if the target memory is unreadable
+ to avoid having the prologue unwinder trying to read it. */
+ || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0)
+ return 1;
- case TYPE_CODE_PTR:
- case TYPE_CODE_ENUM:
- case TYPE_CODE_INT:
- case TYPE_CODE_FLT:
- case TYPE_CODE_SET:
- case TYPE_CODE_RANGE:
- case TYPE_CODE_BITSTRING:
- case TYPE_CODE_REF:
- case TYPE_CODE_CHAR:
- case TYPE_CODE_BOOL:
- return TYPE_LENGTH (t);
+ return 0;
+}
- case TYPE_CODE_ARRAY:
- case TYPE_CODE_COMPLEX:
- /* TODO: What about vector types? */
- return arm_type_align (TYPE_TARGET_TYPE (t));
+struct frame_unwind arm_stub_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ arm_stub_this_id,
+ arm_prologue_prev_register,
+ NULL,
+ arm_stub_unwind_sniffer
+};
- case TYPE_CODE_STRUCT:
- case TYPE_CODE_UNION:
- align = 1;
- for (n = 0; n < TYPE_NFIELDS (t); n++)
- {
- falign = arm_type_align (TYPE_FIELD_TYPE (t, n));
- if (falign > align)
- align = falign;
- }
- return align;
- }
+/* Put here the code to store, into CACHE->saved_regs, the addresses
+ of the saved registers of frame described by THIS_FRAME. CACHE is
+ returned. */
+
+static struct arm_prologue_cache *
+arm_m_exception_cache (struct frame_info *this_frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct arm_prologue_cache *cache;
+ CORE_ADDR unwound_sp;
+ LONGEST xpsr;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ unwound_sp = get_frame_register_unsigned (this_frame,
+ ARM_SP_REGNUM);
+
+ /* The hardware saves eight 32-bit words, comprising xPSR,
+ ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in
+ "B1.5.6 Exception entry behavior" in
+ "ARMv7-M Architecture Reference Manual". */
+ cache->saved_regs[0].addr = unwound_sp;
+ cache->saved_regs[1].addr = unwound_sp + 4;
+ cache->saved_regs[2].addr = unwound_sp + 8;
+ cache->saved_regs[3].addr = unwound_sp + 12;
+ cache->saved_regs[12].addr = unwound_sp + 16;
+ cache->saved_regs[14].addr = unwound_sp + 20;
+ cache->saved_regs[15].addr = unwound_sp + 24;
+ cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28;
+
+ /* If bit 9 of the saved xPSR is set, then there is a four-byte
+ aligner between the top of the 32-byte stack frame and the
+ previous context's stack pointer. */
+ cache->prev_sp = unwound_sp + 32;
+ if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr)
+ && (xpsr & (1 << 9)) != 0)
+ cache->prev_sp += 4;
+
+ return cache;
}
-/* Possible base types for a candidate for passing and returning in
- VFP registers. */
+/* Implementation of function hook 'this_id' in
+ 'struct frame_uwnind'. */
-enum arm_vfp_cprc_base_type
+static void
+arm_m_exception_this_id (struct frame_info *this_frame,
+ void **this_cache,
+ struct frame_id *this_id)
{
- VFP_CPRC_UNKNOWN,
- VFP_CPRC_SINGLE,
- VFP_CPRC_DOUBLE,
- VFP_CPRC_VEC64,
- VFP_CPRC_VEC128
-};
+ struct arm_prologue_cache *cache;
-/* The length of one element of base type B. */
+ if (*this_cache == NULL)
+ *this_cache = arm_m_exception_cache (this_frame);
+ cache = *this_cache;
-static unsigned
-arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b)
+ /* Our frame ID for a stub frame is the current SP and LR. */
+ *this_id = frame_id_build (cache->prev_sp,
+ get_frame_pc (this_frame));
+}
+
+/* Implementation of function hook 'prev_register' in
+ 'struct frame_uwnind'. */
+
+static struct value *
+arm_m_exception_prev_register (struct frame_info *this_frame,
+ void **this_cache,
+ int prev_regnum)
{
- switch (b)
- {
- case VFP_CPRC_SINGLE:
- return 4;
- case VFP_CPRC_DOUBLE:
- return 8;
- case VFP_CPRC_VEC64:
- return 8;
- case VFP_CPRC_VEC128:
- return 16;
- default:
- internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
- (int) b);
- }
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct arm_prologue_cache *cache;
+
+ if (*this_cache == NULL)
+ *this_cache = arm_m_exception_cache (this_frame);
+ cache = *this_cache;
+
+ /* The value was already reconstructed into PREV_SP. */
+ if (prev_regnum == ARM_SP_REGNUM)
+ return frame_unwind_got_constant (this_frame, prev_regnum,
+ cache->prev_sp);
+
+ return trad_frame_get_prev_register (this_frame, cache->saved_regs,
+ prev_regnum);
}
-/* The character ('s', 'd' or 'q') for the type of VFP register used
- for passing base type B. */
+/* Implementation of function hook 'sniffer' in
+ 'struct frame_uwnind'. */
static int
-arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b)
+arm_m_exception_unwind_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- switch (b)
- {
- case VFP_CPRC_SINGLE:
- return 's';
- case VFP_CPRC_DOUBLE:
- return 'd';
- case VFP_CPRC_VEC64:
- return 'd';
- case VFP_CPRC_VEC128:
- return 'q';
- default:
- internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
- (int) b);
- }
-}
-
-/* Determine whether T may be part of a candidate for passing and
- returning in VFP registers, ignoring the limit on the total number
- of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the
- classification of the first valid component found; if it is not
- VFP_CPRC_UNKNOWN, all components must have the same classification
- as *BASE_TYPE. If it is found that T contains a type not permitted
- for passing and returning in VFP registers, a type differently
- classified from *BASE_TYPE, or two types differently classified
- from each other, return -1, otherwise return the total number of
- base-type elements found (possibly 0 in an empty structure or
- array). Vectors and complex types are not currently supported,
- matching the generic AAPCS support. */
+ CORE_ADDR this_pc = get_frame_pc (this_frame);
-static int
-arm_vfp_cprc_sub_candidate (struct type *t,
- enum arm_vfp_cprc_base_type *base_type)
-{
- t = check_typedef (t);
- switch (TYPE_CODE (t))
- {
- case TYPE_CODE_FLT:
- switch (TYPE_LENGTH (t))
- {
- case 4:
- if (*base_type == VFP_CPRC_UNKNOWN)
- *base_type = VFP_CPRC_SINGLE;
- else if (*base_type != VFP_CPRC_SINGLE)
- return -1;
- return 1;
+ /* No need to check is_m; this sniffer is only registered for
+ M-profile architectures. */
- case 8:
- if (*base_type == VFP_CPRC_UNKNOWN)
- *base_type = VFP_CPRC_DOUBLE;
- else if (*base_type != VFP_CPRC_DOUBLE)
- return -1;
- return 1;
+ /* Exception frames return to one of these magic PCs. Other values
+ are not defined as of v7-M. See details in "B1.5.8 Exception
+ return behavior" in "ARMv7-M Architecture Reference Manual". */
+ if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9
+ || this_pc == 0xfffffffd)
+ return 1;
- default:
- return -1;
- }
- break;
+ return 0;
+}
- case TYPE_CODE_ARRAY:
- {
- int count;
- unsigned unitlen;
- count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type);
- if (count == -1)
- return -1;
- if (TYPE_LENGTH (t) == 0)
- {
- gdb_assert (count == 0);
- return 0;
- }
- else if (count == 0)
- return -1;
- unitlen = arm_vfp_cprc_unit_length (*base_type);
- gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0);
- return TYPE_LENGTH (t) / unitlen;
- }
- break;
+/* Frame unwinder for M-profile exceptions. */
- case TYPE_CODE_STRUCT:
- {
- int count = 0;
- unsigned unitlen;
- int i;
- for (i = 0; i < TYPE_NFIELDS (t); i++)
- {
- int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
- base_type);
- if (sub_count == -1)
- return -1;
- count += sub_count;
- }
- if (TYPE_LENGTH (t) == 0)
- {
- gdb_assert (count == 0);
- return 0;
- }
- else if (count == 0)
- return -1;
- unitlen = arm_vfp_cprc_unit_length (*base_type);
- if (TYPE_LENGTH (t) != unitlen * count)
- return -1;
- return count;
- }
+struct frame_unwind arm_m_exception_unwind =
+{
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ arm_m_exception_this_id,
+ arm_m_exception_prev_register,
+ NULL,
+ arm_m_exception_unwind_sniffer
+};
- case TYPE_CODE_UNION:
- {
- int count = 0;
- unsigned unitlen;
- int i;
- for (i = 0; i < TYPE_NFIELDS (t); i++)
- {
- int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
- base_type);
- if (sub_count == -1)
- return -1;
- count = (count > sub_count ? count : sub_count);
- }
- if (TYPE_LENGTH (t) == 0)
- {
- gdb_assert (count == 0);
- return 0;
- }
- else if (count == 0)
- return -1;
- unitlen = arm_vfp_cprc_unit_length (*base_type);
- if (TYPE_LENGTH (t) != unitlen * count)
- return -1;
- return count;
- }
+static CORE_ADDR
+arm_normal_frame_base (struct frame_info *this_frame, void **this_cache)
+{
+ struct arm_prologue_cache *cache;
- default:
- break;
- }
+ if (*this_cache == NULL)
+ *this_cache = arm_make_prologue_cache (this_frame);
+ cache = *this_cache;
- return -1;
+ return cache->prev_sp - cache->framesize;
}
-/* Determine whether T is a VFP co-processor register candidate (CPRC)
- if passed to or returned from a non-variadic function with the VFP
- ABI in effect. Return 1 if it is, 0 otherwise. If it is, set
- *BASE_TYPE to the base type for T and *COUNT to the number of
- elements of that base type before returning. */
+struct frame_base arm_normal_base = {
+ &arm_prologue_unwind,
+ arm_normal_frame_base,
+ arm_normal_frame_base,
+ arm_normal_frame_base
+};
-static int
-arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type,
- int *count)
+/* Assuming THIS_FRAME is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ saved by save_dummy_frame_tos() and returned from
+ arm_push_dummy_call, and the PC needs to match the dummy frame's
+ breakpoint. */
+
+static struct frame_id
+arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN;
- int c = arm_vfp_cprc_sub_candidate (t, &b);
- if (c <= 0 || c > 4)
- return 0;
- *base_type = b;
- *count = c;
- return 1;
+ return frame_id_build (get_frame_register_unsigned (this_frame,
+ ARM_SP_REGNUM),
+ get_frame_pc (this_frame));
}
-/* Return 1 if the VFP ABI should be used for passing arguments to and
- returning values from a function of type FUNC_TYPE, 0
- otherwise. */
+/* Given THIS_FRAME, find the previous frame's resume PC (which will
+ be used to construct the previous frame's ID, after looking up the
+ containing function). */
-static int
-arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type)
+static CORE_ADDR
+arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Variadic functions always use the base ABI. Assume that functions
- without debug info are not variadic. */
- if (func_type && TYPE_VARARGS (check_typedef (func_type)))
- return 0;
- /* The VFP ABI is only supported as a variant of AAPCS. */
- if (tdep->arm_abi != ARM_ABI_AAPCS)
- return 0;
- return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP;
+ CORE_ADDR pc;
+ pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM);
+ return arm_addr_bits_remove (gdbarch, pc);
}
-/* We currently only support passing parameters in integer registers, which
- conforms with GCC's default model, and VFP argument passing following
- the VFP variant of AAPCS. Several other variants exist and
- we should probably support some of them based on the selected ABI. */
-
static CORE_ADDR
-arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
- struct value **args, CORE_ADDR sp, int struct_return,
- CORE_ADDR struct_addr)
+arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int argnum;
- int argreg;
- int nstack;
- struct stack_item *si = NULL;
- int use_vfp_abi;
- struct type *ftype;
- unsigned vfp_regs_free = (1 << 16) - 1;
-
- /* Determine the type of this function and whether the VFP ABI
- applies. */
- ftype = check_typedef (value_type (function));
- if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
- ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
- use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype);
+ return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM);
+}
- /* Set the return address. For the ARM, the return breakpoint is
- always at BP_ADDR. */
- if (arm_pc_is_thumb (gdbarch, bp_addr))
- bp_addr |= 1;
- regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr);
+static struct value *
+arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
+ int regnum)
+{
+ struct gdbarch * gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR lr, cpsr;
+ ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
- /* Walk through the list of args and determine how large a temporary
- stack is required. Need to take care here as structs may be
- passed on the stack, and we have to to push them. */
- nstack = 0;
+ switch (regnum)
+ {
+ case ARM_PC_REGNUM:
+ /* The PC is normally copied from the return column, which
+ describes saves of LR. However, that version may have an
+ extra bit set to indicate Thumb state. The bit is not
+ part of the PC. */
+ lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM);
+ return frame_unwind_got_constant (this_frame, regnum,
+ arm_addr_bits_remove (gdbarch, lr));
- argreg = ARM_A1_REGNUM;
- nstack = 0;
+ case ARM_PS_REGNUM:
+ /* Reconstruct the T bit; see arm_prologue_prev_register for details. */
+ cpsr = get_frame_register_unsigned (this_frame, regnum);
+ lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM);
+ if (IS_THUMB_ADDR (lr))
+ cpsr |= t_bit;
+ else
+ cpsr &= ~t_bit;
+ return frame_unwind_got_constant (this_frame, regnum, cpsr);
- /* The struct_return pointer occupies the first parameter
- passing register. */
- if (struct_return)
- {
- if (arm_debug)
- fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n",
- gdbarch_register_name (gdbarch, argreg),
- paddress (gdbarch, struct_addr));
- regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
- argreg++;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("Unexpected register %d"), regnum);
}
+}
- for (argnum = 0; argnum < nargs; argnum++)
+static void
+arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *this_frame)
+{
+ switch (regnum)
{
- int len;
- struct type *arg_type;
- struct type *target_type;
- enum type_code typecode;
- const bfd_byte *val;
- int align;
- enum arm_vfp_cprc_base_type vfp_base_type;
- int vfp_base_count;
- int may_use_core_reg = 1;
+ case ARM_PC_REGNUM:
+ case ARM_PS_REGNUM:
+ reg->how = DWARF2_FRAME_REG_FN;
+ reg->loc.fn = arm_dwarf2_prev_register;
+ break;
+ case ARM_SP_REGNUM:
+ reg->how = DWARF2_FRAME_REG_CFA;
+ break;
+ }
+}
- arg_type = check_typedef (value_type (args[argnum]));
- len = TYPE_LENGTH (arg_type);
- target_type = TYPE_TARGET_TYPE (arg_type);
- typecode = TYPE_CODE (arg_type);
- val = value_contents (args[argnum]);
+/* Return true if we are in the function's epilogue, i.e. after the
+ instruction that destroyed the function's stack frame. */
- align = arm_type_align (arg_type);
- /* Round alignment up to a whole number of words. */
- align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1);
- /* Different ABIs have different maximum alignments. */
- if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS)
- {
- /* The APCS ABI only requires word alignment. */
- align = INT_REGISTER_SIZE;
- }
- else
- {
- /* The AAPCS requires at most doubleword alignment. */
- if (align > INT_REGISTER_SIZE * 2)
- align = INT_REGISTER_SIZE * 2;
- }
+static int
+thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ unsigned int insn, insn2;
+ int found_return = 0, found_stack_adjust = 0;
+ CORE_ADDR func_start, func_end;
+ CORE_ADDR scan_pc;
+ gdb_byte buf[4];
- if (use_vfp_abi
- && arm_vfp_call_candidate (arg_type, &vfp_base_type,
- &vfp_base_count))
- {
- int regno;
- int unit_length;
- int shift;
- unsigned mask;
+ if (!find_pc_partial_function (pc, NULL, &func_start, &func_end))
+ return 0;
- /* Because this is a CPRC it cannot go in a core register or
- cause a core register to be skipped for alignment.
- Either it goes in VFP registers and the rest of this loop
- iteration is skipped for this argument, or it goes on the
- stack (and the stack alignment code is correct for this
- case). */
- may_use_core_reg = 0;
+ /* The epilogue is a sequence of instructions along the following lines:
- unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
- shift = unit_length / 4;
- mask = (1 << (shift * vfp_base_count)) - 1;
- for (regno = 0; regno < 16; regno += shift)
- if (((vfp_regs_free >> regno) & mask) == mask)
- break;
+ - add stack frame size to SP or FP
+ - [if frame pointer used] restore SP from FP
+ - restore registers from SP [may include PC]
+ - a return-type instruction [if PC wasn't already restored]
- if (regno < 16)
- {
- int reg_char;
- int reg_scaled;
- int i;
+ In a first pass, we scan forward from the current PC and verify the
+ instructions we find as compatible with this sequence, ending in a
+ return instruction.
- vfp_regs_free &= ~(mask << regno);
- reg_scaled = regno / shift;
- reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
- for (i = 0; i < vfp_base_count; i++)
- {
- char name_buf[4];
- int regnum;
- if (reg_char == 'q')
- arm_neon_quad_write (gdbarch, regcache, reg_scaled + i,
- val + i * unit_length);
- else
- {
- sprintf (name_buf, "%c%d", reg_char, reg_scaled + i);
- regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
- regcache_cooked_write (regcache, regnum,
- val + i * unit_length);
- }
- }
- continue;
- }
- else
- {
- /* This CPRC could not go in VFP registers, so all VFP
- registers are now marked as used. */
- vfp_regs_free = 0;
- }
- }
+ However, this is not sufficient to distinguish indirect function calls
+ within a function from indirect tail calls in the epilogue in some cases.
+ Therefore, if we didn't already find any SP-changing instruction during
+ forward scan, we add a backward scanning heuristic to ensure we actually
+ are in the epilogue. */
- /* Push stack padding for dowubleword alignment. */
- if (nstack & (align - 1))
- {
- si = push_stack_item (si, val, INT_REGISTER_SIZE);
- nstack += INT_REGISTER_SIZE;
- }
-
- /* Doubleword aligned quantities must go in even register pairs. */
- if (may_use_core_reg
- && argreg <= ARM_LAST_ARG_REGNUM
- && align > INT_REGISTER_SIZE
- && argreg & 1)
- argreg++;
+ scan_pc = pc;
+ while (scan_pc < func_end && !found_return)
+ {
+ if (target_read_memory (scan_pc, buf, 2))
+ break;
- /* If the argument is a pointer to a function, and it is a
- Thumb function, create a LOCAL copy of the value and set
- the THUMB bit in it. */
- if (TYPE_CODE_PTR == typecode
- && target_type != NULL
- && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type)))
+ scan_pc += 2;
+ insn = extract_unsigned_integer (buf, 2, byte_order_for_code);
+
+ if ((insn & 0xff80) == 0x4700) /* bx <Rm> */
+ found_return = 1;
+ else if (insn == 0x46f7) /* mov pc, lr */
+ found_return = 1;
+ else if (insn == 0x46bd) /* mov sp, r7 */
+ found_stack_adjust = 1;
+ else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */
+ found_stack_adjust = 1;
+ else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */
{
- CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order);
- if (arm_pc_is_thumb (gdbarch, regval))
- {
- bfd_byte *copy = alloca (len);
- store_unsigned_integer (copy, len, byte_order,
- MAKE_THUMB_ADDR (regval));
- val = copy;
- }
+ found_stack_adjust = 1;
+ if (insn & 0x0100) /* <registers> include PC. */
+ found_return = 1;
}
-
- /* Copy the argument to general registers or the stack in
- register-sized pieces. Large arguments are split between
- registers and stack. */
- while (len > 0)
+ else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */
{
- int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE;
+ if (target_read_memory (scan_pc, buf, 2))
+ break;
- if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM)
+ scan_pc += 2;
+ insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code);
+
+ if (insn == 0xe8bd) /* ldm.w sp!, <registers> */
{
- /* The argument is being passed in a general purpose
- register. */
- CORE_ADDR regval
- = extract_unsigned_integer (val, partial_len, byte_order);
- if (byte_order == BFD_ENDIAN_BIG)
- regval <<= (INT_REGISTER_SIZE - partial_len) * 8;
- if (arm_debug)
- fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n",
- argnum,
- gdbarch_register_name
- (gdbarch, argreg),
- phex (regval, INT_REGISTER_SIZE));
- regcache_cooked_write_unsigned (regcache, argreg, regval);
- argreg++;
+ found_stack_adjust = 1;
+ if (insn2 & 0x8000) /* <registers> include PC. */
+ found_return = 1;
}
- else
+ else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */
+ && (insn2 & 0x0fff) == 0x0b04)
{
- /* Push the arguments onto the stack. */
- if (arm_debug)
- fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n",
- argnum, nstack);
- si = push_stack_item (si, val, INT_REGISTER_SIZE);
- nstack += INT_REGISTER_SIZE;
+ found_stack_adjust = 1;
+ if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */
+ found_return = 1;
}
-
- len -= partial_len;
- val += partial_len;
+ else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */
+ && (insn2 & 0x0e00) == 0x0a00)
+ found_stack_adjust = 1;
+ else
+ break;
}
+ else
+ break;
}
- /* If we have an odd number of words to push, then decrement the stack
- by one word now, so first stack argument will be dword aligned. */
- if (nstack & 4)
- sp -= 4;
- while (si)
- {
- sp -= si->len;
- write_memory (sp, si->data, si->len);
- si = pop_stack_item (si);
- }
+ if (!found_return)
+ return 0;
- /* Finally, update teh SP register. */
- regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp);
-
- return sp;
-}
+ /* Since any instruction in the epilogue sequence, with the possible
+ exception of return itself, updates the stack pointer, we need to
+ scan backwards for at most one instruction. Try either a 16-bit or
+ a 32-bit instruction. This is just a heuristic, so we do not worry
+ too much about false positives. */
+ if (!found_stack_adjust)
+ {
+ if (pc - 4 < func_start)
+ return 0;
+ if (target_read_memory (pc - 4, buf, 4))
+ return 0;
-/* Always align the frame to an 8-byte boundary. This is required on
- some platforms and harmless on the rest. */
+ insn = extract_unsigned_integer (buf, 2, byte_order_for_code);
+ insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code);
-static CORE_ADDR
-arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
-{
- /* Align the stack to eight bytes. */
- return sp & ~ (CORE_ADDR) 7;
-}
+ if (insn2 == 0x46bd) /* mov sp, r7 */
+ found_stack_adjust = 1;
+ else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */
+ found_stack_adjust = 1;
+ else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */
+ found_stack_adjust = 1;
+ else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */
+ found_stack_adjust = 1;
+ else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */
+ && (insn2 & 0x0fff) == 0x0b04)
+ found_stack_adjust = 1;
+ else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */
+ && (insn2 & 0x0e00) == 0x0a00)
+ found_stack_adjust = 1;
+ }
-static void
-print_fpu_flags (int flags)
-{
- if (flags & (1 << 0))
- fputs ("IVO ", stdout);
- if (flags & (1 << 1))
- fputs ("DVZ ", stdout);
- if (flags & (1 << 2))
- fputs ("OFL ", stdout);
- if (flags & (1 << 3))
- fputs ("UFL ", stdout);
- if (flags & (1 << 4))
- fputs ("INX ", stdout);
- putchar ('\n');
+ return found_stack_adjust;
}
-/* Print interesting information about the floating point processor
- (if present) or emulator. */
-static void
-arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
- struct frame_info *frame, const char *args)
-{
- unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM);
- int type;
-
- type = (status >> 24) & 127;
- if (status & (1 << 31))
- printf (_("Hardware FPU type %d\n"), type);
- else
- printf (_("Software FPU type %d\n"), type);
- /* i18n: [floating point unit] mask */
- fputs (_("mask: "), stdout);
- print_fpu_flags (status >> 16);
- /* i18n: [floating point unit] flags */
- fputs (_("flags: "), stdout);
- print_fpu_flags (status);
-}
+/* Return true if we are in the function's epilogue, i.e. after the
+ instruction that destroyed the function's stack frame. */
-/* Construct the ARM extended floating point type. */
-static struct type *
-arm_ext_type (struct gdbarch *gdbarch)
+static int
+arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ unsigned int insn;
+ int found_return, found_stack_adjust;
+ CORE_ADDR func_start, func_end;
- if (!tdep->arm_ext_type)
- tdep->arm_ext_type
- = arch_float_type (gdbarch, -1, "builtin_type_arm_ext",
- floatformats_arm_ext);
+ if (arm_pc_is_thumb (gdbarch, pc))
+ return thumb_in_function_epilogue_p (gdbarch, pc);
- return tdep->arm_ext_type;
-}
+ if (!find_pc_partial_function (pc, NULL, &func_start, &func_end))
+ return 0;
-static struct type *
-arm_neon_double_type (struct gdbarch *gdbarch)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ /* We are in the epilogue if the previous instruction was a stack
+ adjustment and the next instruction is a possible return (bx, mov
+ pc, or pop). We could have to scan backwards to find the stack
+ adjustment, or forwards to find the return, but this is a decent
+ approximation. First scan forwards. */
- if (tdep->neon_double_type == NULL)
+ found_return = 0;
+ insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
+ if (bits (insn, 28, 31) != INST_NV)
{
- struct type *t, *elem;
-
- t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d",
- TYPE_CODE_UNION);
- elem = builtin_type (gdbarch)->builtin_uint8;
- append_composite_type_field (t, "u8", init_vector_type (elem, 8));
- elem = builtin_type (gdbarch)->builtin_uint16;
- append_composite_type_field (t, "u16", init_vector_type (elem, 4));
- elem = builtin_type (gdbarch)->builtin_uint32;
- append_composite_type_field (t, "u32", init_vector_type (elem, 2));
- elem = builtin_type (gdbarch)->builtin_uint64;
- append_composite_type_field (t, "u64", elem);
- elem = builtin_type (gdbarch)->builtin_float;
- append_composite_type_field (t, "f32", init_vector_type (elem, 2));
- elem = builtin_type (gdbarch)->builtin_double;
- append_composite_type_field (t, "f64", elem);
-
- TYPE_VECTOR (t) = 1;
- TYPE_NAME (t) = "neon_d";
- tdep->neon_double_type = t;
+ if ((insn & 0x0ffffff0) == 0x012fff10)
+ /* BX. */
+ found_return = 1;
+ else if ((insn & 0x0ffffff0) == 0x01a0f000)
+ /* MOV PC. */
+ found_return = 1;
+ else if ((insn & 0x0fff0000) == 0x08bd0000
+ && (insn & 0x0000c000) != 0)
+ /* POP (LDMIA), including PC or LR. */
+ found_return = 1;
}
- return tdep->neon_double_type;
-}
+ if (!found_return)
+ return 0;
-/* FIXME: The vector types are not correctly ordered on big-endian
- targets. Just as s0 is the low bits of d0, d0[0] is also the low
- bits of d0 - regardless of what unit size is being held in d0. So
- the offset of the first uint8 in d0 is 7, but the offset of the
- first float is 4. This code works as-is for little-endian
- targets. */
+ /* Scan backwards. This is just a heuristic, so do not worry about
+ false positives from mode changes. */
-static struct type *
-arm_neon_quad_type (struct gdbarch *gdbarch)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ if (pc < func_start + 4)
+ return 0;
- if (tdep->neon_quad_type == NULL)
+ found_stack_adjust = 0;
+ insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code);
+ if (bits (insn, 28, 31) != INST_NV)
{
- struct type *t, *elem;
-
- t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q",
- TYPE_CODE_UNION);
- elem = builtin_type (gdbarch)->builtin_uint8;
- append_composite_type_field (t, "u8", init_vector_type (elem, 16));
- elem = builtin_type (gdbarch)->builtin_uint16;
- append_composite_type_field (t, "u16", init_vector_type (elem, 8));
- elem = builtin_type (gdbarch)->builtin_uint32;
- append_composite_type_field (t, "u32", init_vector_type (elem, 4));
- elem = builtin_type (gdbarch)->builtin_uint64;
- append_composite_type_field (t, "u64", init_vector_type (elem, 2));
- elem = builtin_type (gdbarch)->builtin_float;
- append_composite_type_field (t, "f32", init_vector_type (elem, 4));
- elem = builtin_type (gdbarch)->builtin_double;
- append_composite_type_field (t, "f64", init_vector_type (elem, 2));
-
- TYPE_VECTOR (t) = 1;
- TYPE_NAME (t) = "neon_q";
- tdep->neon_quad_type = t;
+ if ((insn & 0x0df0f000) == 0x0080d000)
+ /* ADD SP (register or immediate). */
+ found_stack_adjust = 1;
+ else if ((insn & 0x0df0f000) == 0x0040d000)
+ /* SUB SP (register or immediate). */
+ found_stack_adjust = 1;
+ else if ((insn & 0x0ffffff0) == 0x01a0d000)
+ /* MOV SP. */
+ found_stack_adjust = 1;
+ else if ((insn & 0x0fff0000) == 0x08bd0000)
+ /* POP (LDMIA). */
+ found_stack_adjust = 1;
+ else if ((insn & 0x0fff0000) == 0x049d0000)
+ /* POP of a single register. */
+ found_stack_adjust = 1;
}
- return tdep->neon_quad_type;
+ if (found_stack_adjust)
+ return 1;
+
+ return 0;
}
-/* Return the GDB type object for the "standard" data type of data in
- register N. */
-static struct type *
-arm_register_type (struct gdbarch *gdbarch, int regnum)
+/* When arguments must be pushed onto the stack, they go on in reverse
+ order. The code below implements a FILO (stack) to do this. */
+
+struct stack_item
{
- int num_regs = gdbarch_num_regs (gdbarch);
+ int len;
+ struct stack_item *prev;
+ void *data;
+};
- if (gdbarch_tdep (gdbarch)->have_vfp_pseudos
- && regnum >= num_regs && regnum < num_regs + 32)
- return builtin_type (gdbarch)->builtin_float;
+static struct stack_item *
+push_stack_item (struct stack_item *prev, const void *contents, int len)
+{
+ struct stack_item *si;
+ si = xmalloc (sizeof (struct stack_item));
+ si->data = xmalloc (len);
+ si->len = len;
+ si->prev = prev;
+ memcpy (si->data, contents, len);
+ return si;
+}
- if (gdbarch_tdep (gdbarch)->have_neon_pseudos
- && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16)
- return arm_neon_quad_type (gdbarch);
+static struct stack_item *
+pop_stack_item (struct stack_item *si)
+{
+ struct stack_item *dead = si;
+ si = si->prev;
+ xfree (dead->data);
+ xfree (dead);
+ return si;
+}
- /* If the target description has register information, we are only
- in this function so that we can override the types of
- double-precision registers for NEON. */
- if (tdesc_has_registers (gdbarch_target_desc (gdbarch)))
- {
- struct type *t = tdesc_register_type (gdbarch, regnum);
- if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32
- && TYPE_CODE (t) == TYPE_CODE_FLT
- && gdbarch_tdep (gdbarch)->have_neon)
- return arm_neon_double_type (gdbarch);
- else
- return t;
- }
+/* Return the alignment (in bytes) of the given type. */
- if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS)
+static int
+arm_type_align (struct type *t)
+{
+ int n;
+ int align;
+ int falign;
+
+ t = check_typedef (t);
+ switch (TYPE_CODE (t))
{
- if (!gdbarch_tdep (gdbarch)->have_fpa_registers)
- return builtin_type (gdbarch)->builtin_void;
+ default:
+ /* Should never happen. */
+ internal_error (__FILE__, __LINE__, _("unknown type alignment"));
+ return 4;
- return arm_ext_type (gdbarch);
- }
- else if (regnum == ARM_SP_REGNUM)
- return builtin_type (gdbarch)->builtin_data_ptr;
- else if (regnum == ARM_PC_REGNUM)
- return builtin_type (gdbarch)->builtin_func_ptr;
- else if (regnum >= ARRAY_SIZE (arm_register_names))
- /* These registers are only supported on targets which supply
- an XML description. */
- return builtin_type (gdbarch)->builtin_int0;
- else
- return builtin_type (gdbarch)->builtin_uint32;
-}
-
-/* Map a DWARF register REGNUM onto the appropriate GDB register
- number. */
-
-static int
-arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
-{
- /* Core integer regs. */
- if (reg >= 0 && reg <= 15)
- return reg;
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_INT:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_REF:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ return TYPE_LENGTH (t);
- /* Legacy FPA encoding. These were once used in a way which
- overlapped with VFP register numbering, so their use is
- discouraged, but GDB doesn't support the ARM toolchain
- which used them for VFP. */
- if (reg >= 16 && reg <= 23)
- return ARM_F0_REGNUM + reg - 16;
+ case TYPE_CODE_ARRAY:
+ case TYPE_CODE_COMPLEX:
+ /* TODO: What about vector types? */
+ return arm_type_align (TYPE_TARGET_TYPE (t));
- /* New assignments for the FPA registers. */
- if (reg >= 96 && reg <= 103)
- return ARM_F0_REGNUM + reg - 96;
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ align = 1;
+ for (n = 0; n < TYPE_NFIELDS (t); n++)
+ {
+ falign = arm_type_align (TYPE_FIELD_TYPE (t, n));
+ if (falign > align)
+ align = falign;
+ }
+ return align;
+ }
+}
- /* WMMX register assignments. */
- if (reg >= 104 && reg <= 111)
- return ARM_WCGR0_REGNUM + reg - 104;
+/* Possible base types for a candidate for passing and returning in
+ VFP registers. */
- if (reg >= 112 && reg <= 127)
- return ARM_WR0_REGNUM + reg - 112;
+enum arm_vfp_cprc_base_type
+{
+ VFP_CPRC_UNKNOWN,
+ VFP_CPRC_SINGLE,
+ VFP_CPRC_DOUBLE,
+ VFP_CPRC_VEC64,
+ VFP_CPRC_VEC128
+};
- if (reg >= 192 && reg <= 199)
- return ARM_WC0_REGNUM + reg - 192;
+/* The length of one element of base type B. */
- /* VFP v2 registers. A double precision value is actually
- in d1 rather than s2, but the ABI only defines numbering
- for the single precision registers. This will "just work"
- in GDB for little endian targets (we'll read eight bytes,
- starting in s0 and then progressing to s1), but will be
- reversed on big endian targets with VFP. This won't
- be a problem for the new Neon quad registers; you're supposed
- to use DW_OP_piece for those. */
- if (reg >= 64 && reg <= 95)
+static unsigned
+arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b)
+{
+ switch (b)
{
- char name_buf[4];
-
- sprintf (name_buf, "s%d", reg - 64);
- return user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
+ case VFP_CPRC_SINGLE:
+ return 4;
+ case VFP_CPRC_DOUBLE:
+ return 8;
+ case VFP_CPRC_VEC64:
+ return 8;
+ case VFP_CPRC_VEC128:
+ return 16;
+ default:
+ internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
+ (int) b);
}
+}
- /* VFP v3 / Neon registers. This range is also used for VFP v2
- registers, except that it now describes d0 instead of s0. */
- if (reg >= 256 && reg <= 287)
- {
- char name_buf[4];
+/* The character ('s', 'd' or 'q') for the type of VFP register used
+ for passing base type B. */
- sprintf (name_buf, "d%d", reg - 256);
- return user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
+static int
+arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b)
+{
+ switch (b)
+ {
+ case VFP_CPRC_SINGLE:
+ return 's';
+ case VFP_CPRC_DOUBLE:
+ return 'd';
+ case VFP_CPRC_VEC64:
+ return 'd';
+ case VFP_CPRC_VEC128:
+ return 'q';
+ default:
+ internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
+ (int) b);
}
-
- return -1;
}
-/* Map GDB internal REGNUM onto the Arm simulator register numbers. */
+/* Determine whether T may be part of a candidate for passing and
+ returning in VFP registers, ignoring the limit on the total number
+ of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the
+ classification of the first valid component found; if it is not
+ VFP_CPRC_UNKNOWN, all components must have the same classification
+ as *BASE_TYPE. If it is found that T contains a type not permitted
+ for passing and returning in VFP registers, a type differently
+ classified from *BASE_TYPE, or two types differently classified
+ from each other, return -1, otherwise return the total number of
+ base-type elements found (possibly 0 in an empty structure or
+ array). Vectors and complex types are not currently supported,
+ matching the generic AAPCS support. */
+
static int
-arm_register_sim_regno (struct gdbarch *gdbarch, int regnum)
+arm_vfp_cprc_sub_candidate (struct type *t,
+ enum arm_vfp_cprc_base_type *base_type)
{
- int reg = regnum;
- gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch));
+ t = check_typedef (t);
+ switch (TYPE_CODE (t))
+ {
+ case TYPE_CODE_FLT:
+ switch (TYPE_LENGTH (t))
+ {
+ case 4:
+ if (*base_type == VFP_CPRC_UNKNOWN)
+ *base_type = VFP_CPRC_SINGLE;
+ else if (*base_type != VFP_CPRC_SINGLE)
+ return -1;
+ return 1;
- if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM)
- return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM;
+ case 8:
+ if (*base_type == VFP_CPRC_UNKNOWN)
+ *base_type = VFP_CPRC_DOUBLE;
+ else if (*base_type != VFP_CPRC_DOUBLE)
+ return -1;
+ return 1;
- if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM)
- return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM;
+ default:
+ return -1;
+ }
+ break;
- if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM)
- return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM;
+ case TYPE_CODE_ARRAY:
+ {
+ int count;
+ unsigned unitlen;
+ count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type);
+ if (count == -1)
+ return -1;
+ if (TYPE_LENGTH (t) == 0)
+ {
+ gdb_assert (count == 0);
+ return 0;
+ }
+ else if (count == 0)
+ return -1;
+ unitlen = arm_vfp_cprc_unit_length (*base_type);
+ gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0);
+ return TYPE_LENGTH (t) / unitlen;
+ }
+ break;
- if (reg < NUM_GREGS)
- return SIM_ARM_R0_REGNUM + reg;
- reg -= NUM_GREGS;
+ case TYPE_CODE_STRUCT:
+ {
+ int count = 0;
+ unsigned unitlen;
+ int i;
+ for (i = 0; i < TYPE_NFIELDS (t); i++)
+ {
+ int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
+ base_type);
+ if (sub_count == -1)
+ return -1;
+ count += sub_count;
+ }
+ if (TYPE_LENGTH (t) == 0)
+ {
+ gdb_assert (count == 0);
+ return 0;
+ }
+ else if (count == 0)
+ return -1;
+ unitlen = arm_vfp_cprc_unit_length (*base_type);
+ if (TYPE_LENGTH (t) != unitlen * count)
+ return -1;
+ return count;
+ }
- if (reg < NUM_FREGS)
- return SIM_ARM_FP0_REGNUM + reg;
- reg -= NUM_FREGS;
+ case TYPE_CODE_UNION:
+ {
+ int count = 0;
+ unsigned unitlen;
+ int i;
+ for (i = 0; i < TYPE_NFIELDS (t); i++)
+ {
+ int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
+ base_type);
+ if (sub_count == -1)
+ return -1;
+ count = (count > sub_count ? count : sub_count);
+ }
+ if (TYPE_LENGTH (t) == 0)
+ {
+ gdb_assert (count == 0);
+ return 0;
+ }
+ else if (count == 0)
+ return -1;
+ unitlen = arm_vfp_cprc_unit_length (*base_type);
+ if (TYPE_LENGTH (t) != unitlen * count)
+ return -1;
+ return count;
+ }
- if (reg < NUM_SREGS)
- return SIM_ARM_FPS_REGNUM + reg;
- reg -= NUM_SREGS;
+ default:
+ break;
+ }
- internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum);
+ return -1;
}
-/* NOTE: cagney/2001-08-20: Both convert_from_extended() and
- convert_to_extended() use floatformat_arm_ext_littlebyte_bigword.
- It is thought that this is is the floating-point register format on
- little-endian systems. */
+/* Determine whether T is a VFP co-processor register candidate (CPRC)
+ if passed to or returned from a non-variadic function with the VFP
+ ABI in effect. Return 1 if it is, 0 otherwise. If it is, set
+ *BASE_TYPE to the base type for T and *COUNT to the number of
+ elements of that base type before returning. */
-static void
-convert_from_extended (const struct floatformat *fmt, const void *ptr,
- void *dbl, int endianess)
+static int
+arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type,
+ int *count)
{
- DOUBLEST d;
-
- if (endianess == BFD_ENDIAN_BIG)
- floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d);
- else
- floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword,
- ptr, &d);
- floatformat_from_doublest (fmt, &d, dbl);
+ enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN;
+ int c = arm_vfp_cprc_sub_candidate (t, &b);
+ if (c <= 0 || c > 4)
+ return 0;
+ *base_type = b;
+ *count = c;
+ return 1;
}
-static void
-convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr,
- int endianess)
-{
- DOUBLEST d;
-
- floatformat_to_doublest (fmt, ptr, &d);
- if (endianess == BFD_ENDIAN_BIG)
- floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl);
- else
- floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword,
- &d, dbl);
-}
+/* Return 1 if the VFP ABI should be used for passing arguments to and
+ returning values from a function of type FUNC_TYPE, 0
+ otherwise. */
static int
-condition_true (unsigned long cond, unsigned long status_reg)
+arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type)
{
- if (cond == INST_AL || cond == INST_NV)
- return 1;
-
- switch (cond)
- {
- case INST_EQ:
- return ((status_reg & FLAG_Z) != 0);
- case INST_NE:
- return ((status_reg & FLAG_Z) == 0);
- case INST_CS:
- return ((status_reg & FLAG_C) != 0);
- case INST_CC:
- return ((status_reg & FLAG_C) == 0);
- case INST_MI:
- return ((status_reg & FLAG_N) != 0);
- case INST_PL:
- return ((status_reg & FLAG_N) == 0);
- case INST_VS:
- return ((status_reg & FLAG_V) != 0);
- case INST_VC:
- return ((status_reg & FLAG_V) == 0);
- case INST_HI:
- return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C);
- case INST_LS:
- return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
- case INST_GE:
- return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
- case INST_LT:
- return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
- case INST_GT:
- return (((status_reg & FLAG_Z) == 0)
- && (((status_reg & FLAG_N) == 0)
- == ((status_reg & FLAG_V) == 0)));
- case INST_LE:
- return (((status_reg & FLAG_Z) != 0)
- || (((status_reg & FLAG_N) == 0)
- != ((status_reg & FLAG_V) == 0)));
- }
- return 1;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ /* Variadic functions always use the base ABI. Assume that functions
+ without debug info are not variadic. */
+ if (func_type && TYPE_VARARGS (check_typedef (func_type)))
+ return 0;
+ /* The VFP ABI is only supported as a variant of AAPCS. */
+ if (tdep->arm_abi != ARM_ABI_AAPCS)
+ return 0;
+ return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP;
}
-static unsigned long
-shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry,
- unsigned long pc_val, unsigned long status_reg)
-{
- unsigned long res, shift;
- int rm = bits (inst, 0, 3);
- unsigned long shifttype = bits (inst, 5, 6);
+/* We currently only support passing parameters in integer registers, which
+ conforms with GCC's default model, and VFP argument passing following
+ the VFP variant of AAPCS. Several other variants exist and
+ we should probably support some of them based on the selected ABI. */
- if (bit (inst, 4))
- {
- int rs = bits (inst, 8, 11);
- shift = (rs == 15 ? pc_val + 8
- : get_frame_register_unsigned (frame, rs)) & 0xFF;
- }
- else
- shift = bits (inst, 7, 11);
+static CORE_ADDR
+arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int argnum;
+ int argreg;
+ int nstack;
+ struct stack_item *si = NULL;
+ int use_vfp_abi;
+ struct type *ftype;
+ unsigned vfp_regs_free = (1 << 16) - 1;
- res = (rm == 15
- ? (pc_val + (bit (inst, 4) ? 12 : 8))
- : get_frame_register_unsigned (frame, rm));
+ /* Determine the type of this function and whether the VFP ABI
+ applies. */
+ ftype = check_typedef (value_type (function));
+ if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
+ ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
+ use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype);
- switch (shifttype)
- {
- case 0: /* LSL */
- res = shift >= 32 ? 0 : res << shift;
- break;
+ /* Set the return address. For the ARM, the return breakpoint is
+ always at BP_ADDR. */
+ if (arm_pc_is_thumb (gdbarch, bp_addr))
+ bp_addr |= 1;
+ regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr);
- case 1: /* LSR */
- res = shift >= 32 ? 0 : res >> shift;
- break;
+ /* Walk through the list of args and determine how large a temporary
+ stack is required. Need to take care here as structs may be
+ passed on the stack, and we have to push them. */
+ nstack = 0;
- case 2: /* ASR */
- if (shift >= 32)
- shift = 31;
- res = ((res & 0x80000000L)
- ? ~((~res) >> shift) : res >> shift);
- break;
+ argreg = ARM_A1_REGNUM;
+ nstack = 0;
- case 3: /* ROR/RRX */
- shift &= 31;
- if (shift == 0)
- res = (res >> 1) | (carry ? 0x80000000L : 0);
- else
- res = (res >> shift) | (res << (32 - shift));
- break;
+ /* The struct_return pointer occupies the first parameter
+ passing register. */
+ if (struct_return)
+ {
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n",
+ gdbarch_register_name (gdbarch, argreg),
+ paddress (gdbarch, struct_addr));
+ regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
+ argreg++;
}
- return res & 0xffffffff;
-}
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ int len;
+ struct type *arg_type;
+ struct type *target_type;
+ enum type_code typecode;
+ const bfd_byte *val;
+ int align;
+ enum arm_vfp_cprc_base_type vfp_base_type;
+ int vfp_base_count;
+ int may_use_core_reg = 1;
-/* Return number of 1-bits in VAL. */
+ arg_type = check_typedef (value_type (args[argnum]));
+ len = TYPE_LENGTH (arg_type);
+ target_type = TYPE_TARGET_TYPE (arg_type);
+ typecode = TYPE_CODE (arg_type);
+ val = value_contents (args[argnum]);
-static int
-bitcount (unsigned long val)
-{
- int nbits;
- for (nbits = 0; val != 0; nbits++)
- val &= val - 1; /* delete rightmost 1-bit in val */
- return nbits;
-}
+ align = arm_type_align (arg_type);
+ /* Round alignment up to a whole number of words. */
+ align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1);
+ /* Different ABIs have different maximum alignments. */
+ if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS)
+ {
+ /* The APCS ABI only requires word alignment. */
+ align = INT_REGISTER_SIZE;
+ }
+ else
+ {
+ /* The AAPCS requires at most doubleword alignment. */
+ if (align > INT_REGISTER_SIZE * 2)
+ align = INT_REGISTER_SIZE * 2;
+ }
-/* Return the size in bytes of the complete Thumb instruction whose
- first halfword is INST1. */
+ if (use_vfp_abi
+ && arm_vfp_call_candidate (arg_type, &vfp_base_type,
+ &vfp_base_count))
+ {
+ int regno;
+ int unit_length;
+ int shift;
+ unsigned mask;
-static int
-thumb_insn_size (unsigned short inst1)
-{
- if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
- return 4;
- else
- return 2;
-}
+ /* Because this is a CPRC it cannot go in a core register or
+ cause a core register to be skipped for alignment.
+ Either it goes in VFP registers and the rest of this loop
+ iteration is skipped for this argument, or it goes on the
+ stack (and the stack alignment code is correct for this
+ case). */
+ may_use_core_reg = 0;
-static int
-thumb_advance_itstate (unsigned int itstate)
-{
- /* Preserve IT[7:5], the first three bits of the condition. Shift
- the upcoming condition flags left by one bit. */
- itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f);
+ unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
+ shift = unit_length / 4;
+ mask = (1 << (shift * vfp_base_count)) - 1;
+ for (regno = 0; regno < 16; regno += shift)
+ if (((vfp_regs_free >> regno) & mask) == mask)
+ break;
- /* If we have finished the IT block, clear the state. */
- if ((itstate & 0x0f) == 0)
- itstate = 0;
-
- return itstate;
-}
-
-/* Find the next PC after the current instruction executes. In some
- cases we can not statically determine the answer (see the IT state
- handling in this function); in that case, a breakpoint may be
- inserted in addition to the returned PC, which will be used to set
- another breakpoint by our caller. */
-
-static CORE_ADDR
-thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc, int insert_bkpt)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct address_space *aspace = get_frame_address_space (frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */
- unsigned short inst1;
- CORE_ADDR nextpc = pc + 2; /* default is next instruction */
- unsigned long offset;
- ULONGEST status, itstate;
-
- nextpc = MAKE_THUMB_ADDR (nextpc);
- pc_val = MAKE_THUMB_ADDR (pc_val);
-
- inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
-
- /* Thumb-2 conditional execution support. There are eight bits in
- the CPSR which describe conditional execution state. Once
- reconstructed (they're in a funny order), the low five bits
- describe the low bit of the condition for each instruction and
- how many instructions remain. The high three bits describe the
- base condition. One of the low four bits will be set if an IT
- block is active. These bits read as zero on earlier
- processors. */
- status = get_frame_register_unsigned (frame, ARM_PS_REGNUM);
- itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3);
-
- /* If-Then handling. On GNU/Linux, where this routine is used, we
- use an undefined instruction as a breakpoint. Unlike BKPT, IT
- can disable execution of the undefined instruction. So we might
- miss the breakpoint if we set it on a skipped conditional
- instruction. Because conditional instructions can change the
- flags, affecting the execution of further instructions, we may
- need to set two breakpoints. */
-
- if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL)
- {
- if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
- {
- /* An IT instruction. Because this instruction does not
- modify the flags, we can accurately predict the next
- executed instruction. */
- itstate = inst1 & 0x00ff;
- pc += thumb_insn_size (inst1);
-
- while (itstate != 0 && ! condition_true (itstate >> 4, status))
- {
- inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
- pc += thumb_insn_size (inst1);
- itstate = thumb_advance_itstate (itstate);
- }
-
- return MAKE_THUMB_ADDR (pc);
- }
- else if (itstate != 0)
- {
- /* We are in a conditional block. Check the condition. */
- if (! condition_true (itstate >> 4, status))
+ if (regno < 16)
{
- /* Advance to the next executed instruction. */
- pc += thumb_insn_size (inst1);
- itstate = thumb_advance_itstate (itstate);
+ int reg_char;
+ int reg_scaled;
+ int i;
- while (itstate != 0 && ! condition_true (itstate >> 4, status))
+ vfp_regs_free &= ~(mask << regno);
+ reg_scaled = regno / shift;
+ reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
+ for (i = 0; i < vfp_base_count; i++)
{
- inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
- pc += thumb_insn_size (inst1);
- itstate = thumb_advance_itstate (itstate);
+ char name_buf[4];
+ int regnum;
+ if (reg_char == 'q')
+ arm_neon_quad_write (gdbarch, regcache, reg_scaled + i,
+ val + i * unit_length);
+ else
+ {
+ xsnprintf (name_buf, sizeof (name_buf), "%c%d",
+ reg_char, reg_scaled + i);
+ regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
+ regcache_cooked_write (regcache, regnum,
+ val + i * unit_length);
+ }
}
-
- return MAKE_THUMB_ADDR (pc);
- }
- else if ((itstate & 0x0f) == 0x08)
- {
- /* This is the last instruction of the conditional
- block, and it is executed. We can handle it normally
- because the following instruction is not conditional,
- and we must handle it normally because it is
- permitted to branch. Fall through. */
+ continue;
}
else
{
- int cond_negated;
-
- /* There are conditional instructions after this one.
- If this instruction modifies the flags, then we can
- not predict what the next executed instruction will
- be. Fortunately, this instruction is architecturally
- forbidden to branch; we know it will fall through.
- Start by skipping past it. */
- pc += thumb_insn_size (inst1);
- itstate = thumb_advance_itstate (itstate);
-
- /* Set a breakpoint on the following instruction. */
- gdb_assert ((itstate & 0x0f) != 0);
- if (insert_bkpt)
- insert_single_step_breakpoint (gdbarch, aspace, pc);
- cond_negated = (itstate >> 4) & 1;
+ /* This CPRC could not go in VFP registers, so all VFP
+ registers are now marked as used. */
+ vfp_regs_free = 0;
+ }
+ }
- /* Skip all following instructions with the same
- condition. If there is a later instruction in the IT
- block with the opposite condition, set the other
- breakpoint there. If not, then set a breakpoint on
- the instruction after the IT block. */
- do
- {
- inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
- pc += thumb_insn_size (inst1);
- itstate = thumb_advance_itstate (itstate);
- }
- while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated);
+ /* Push stack padding for dowubleword alignment. */
+ if (nstack & (align - 1))
+ {
+ si = push_stack_item (si, val, INT_REGISTER_SIZE);
+ nstack += INT_REGISTER_SIZE;
+ }
+
+ /* Doubleword aligned quantities must go in even register pairs. */
+ if (may_use_core_reg
+ && argreg <= ARM_LAST_ARG_REGNUM
+ && align > INT_REGISTER_SIZE
+ && argreg & 1)
+ argreg++;
- return MAKE_THUMB_ADDR (pc);
+ /* If the argument is a pointer to a function, and it is a
+ Thumb function, create a LOCAL copy of the value and set
+ the THUMB bit in it. */
+ if (TYPE_CODE_PTR == typecode
+ && target_type != NULL
+ && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type)))
+ {
+ CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order);
+ if (arm_pc_is_thumb (gdbarch, regval))
+ {
+ bfd_byte *copy = alloca (len);
+ store_unsigned_integer (copy, len, byte_order,
+ MAKE_THUMB_ADDR (regval));
+ val = copy;
}
}
- }
- else if (itstate & 0x0f)
- {
- /* We are in a conditional block. Check the condition. */
- int cond = itstate >> 4;
- if (! condition_true (cond, status))
+ /* Copy the argument to general registers or the stack in
+ register-sized pieces. Large arguments are split between
+ registers and stack. */
+ while (len > 0)
{
- /* Advance to the next instruction. All the 32-bit
- instructions share a common prefix. */
- if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
- return MAKE_THUMB_ADDR (pc + 4);
+ int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE;
+
+ if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM)
+ {
+ /* The argument is being passed in a general purpose
+ register. */
+ CORE_ADDR regval
+ = extract_unsigned_integer (val, partial_len, byte_order);
+ if (byte_order == BFD_ENDIAN_BIG)
+ regval <<= (INT_REGISTER_SIZE - partial_len) * 8;
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n",
+ argnum,
+ gdbarch_register_name
+ (gdbarch, argreg),
+ phex (regval, INT_REGISTER_SIZE));
+ regcache_cooked_write_unsigned (regcache, argreg, regval);
+ argreg++;
+ }
else
- return MAKE_THUMB_ADDR (pc + 2);
+ {
+ /* Push the arguments onto the stack. */
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n",
+ argnum, nstack);
+ si = push_stack_item (si, val, INT_REGISTER_SIZE);
+ nstack += INT_REGISTER_SIZE;
+ }
+
+ len -= partial_len;
+ val += partial_len;
}
-
- /* Otherwise, handle the instruction normally. */
}
+ /* If we have an odd number of words to push, then decrement the stack
+ by one word now, so first stack argument will be dword aligned. */
+ if (nstack & 4)
+ sp -= 4;
- if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */
+ while (si)
{
- CORE_ADDR sp;
-
- /* Fetch the saved PC from the stack. It's stored above
- all of the other registers. */
- offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE;
- sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM);
- nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order);
+ sp -= si->len;
+ write_memory (sp, si->data, si->len);
+ si = pop_stack_item (si);
}
- else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */
- {
- unsigned long cond = bits (inst1, 8, 11);
- if (cond == 0x0f) /* 0x0f = SWI */
- {
- struct gdbarch_tdep *tdep;
- tdep = gdbarch_tdep (gdbarch);
- if (tdep->syscall_next_pc != NULL)
- nextpc = tdep->syscall_next_pc (frame);
+ /* Finally, update teh SP register. */
+ regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp);
- }
- else if (cond != 0x0f && condition_true (cond, status))
- nextpc = pc_val + (sbits (inst1, 0, 7) << 1);
- }
- else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */
- {
- nextpc = pc_val + (sbits (inst1, 0, 10) << 1);
- }
- else if ((inst1 & 0xe000) == 0xe000) /* 32-bit instruction */
- {
- unsigned short inst2;
- inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code);
+ return sp;
+}
- /* Default to the next instruction. */
- nextpc = pc + 4;
- nextpc = MAKE_THUMB_ADDR (nextpc);
- if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000)
- {
- /* Branches and miscellaneous control instructions. */
+/* Always align the frame to an 8-byte boundary. This is required on
+ some platforms and harmless on the rest. */
- if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000)
+static CORE_ADDR
+arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+ /* Align the stack to eight bytes. */
+ return sp & ~ (CORE_ADDR) 7;
+}
+
+static void
+print_fpu_flags (struct ui_file *file, int flags)
+{
+ if (flags & (1 << 0))
+ fputs_filtered ("IVO ", file);
+ if (flags & (1 << 1))
+ fputs_filtered ("DVZ ", file);
+ if (flags & (1 << 2))
+ fputs_filtered ("OFL ", file);
+ if (flags & (1 << 3))
+ fputs_filtered ("UFL ", file);
+ if (flags & (1 << 4))
+ fputs_filtered ("INX ", file);
+ fputc_filtered ('\n', file);
+}
+
+/* Print interesting information about the floating point processor
+ (if present) or emulator. */
+static void
+arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
+ struct frame_info *frame, const char *args)
+{
+ unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM);
+ int type;
+
+ type = (status >> 24) & 127;
+ if (status & (1 << 31))
+ fprintf_filtered (file, _("Hardware FPU type %d\n"), type);
+ else
+ fprintf_filtered (file, _("Software FPU type %d\n"), type);
+ /* i18n: [floating point unit] mask */
+ fputs_filtered (_("mask: "), file);
+ print_fpu_flags (file, status >> 16);
+ /* i18n: [floating point unit] flags */
+ fputs_filtered (_("flags: "), file);
+ print_fpu_flags (file, status);
+}
+
+/* Construct the ARM extended floating point type. */
+static struct type *
+arm_ext_type (struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (!tdep->arm_ext_type)
+ tdep->arm_ext_type
+ = arch_float_type (gdbarch, -1, "builtin_type_arm_ext",
+ floatformats_arm_ext);
+
+ return tdep->arm_ext_type;
+}
+
+static struct type *
+arm_neon_double_type (struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->neon_double_type == NULL)
+ {
+ struct type *t, *elem;
+
+ t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d",
+ TYPE_CODE_UNION);
+ elem = builtin_type (gdbarch)->builtin_uint8;
+ append_composite_type_field (t, "u8", init_vector_type (elem, 8));
+ elem = builtin_type (gdbarch)->builtin_uint16;
+ append_composite_type_field (t, "u16", init_vector_type (elem, 4));
+ elem = builtin_type (gdbarch)->builtin_uint32;
+ append_composite_type_field (t, "u32", init_vector_type (elem, 2));
+ elem = builtin_type (gdbarch)->builtin_uint64;
+ append_composite_type_field (t, "u64", elem);
+ elem = builtin_type (gdbarch)->builtin_float;
+ append_composite_type_field (t, "f32", init_vector_type (elem, 2));
+ elem = builtin_type (gdbarch)->builtin_double;
+ append_composite_type_field (t, "f64", elem);
+
+ TYPE_VECTOR (t) = 1;
+ TYPE_NAME (t) = "neon_d";
+ tdep->neon_double_type = t;
+ }
+
+ return tdep->neon_double_type;
+}
+
+/* FIXME: The vector types are not correctly ordered on big-endian
+ targets. Just as s0 is the low bits of d0, d0[0] is also the low
+ bits of d0 - regardless of what unit size is being held in d0. So
+ the offset of the first uint8 in d0 is 7, but the offset of the
+ first float is 4. This code works as-is for little-endian
+ targets. */
+
+static struct type *
+arm_neon_quad_type (struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->neon_quad_type == NULL)
+ {
+ struct type *t, *elem;
+
+ t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q",
+ TYPE_CODE_UNION);
+ elem = builtin_type (gdbarch)->builtin_uint8;
+ append_composite_type_field (t, "u8", init_vector_type (elem, 16));
+ elem = builtin_type (gdbarch)->builtin_uint16;
+ append_composite_type_field (t, "u16", init_vector_type (elem, 8));
+ elem = builtin_type (gdbarch)->builtin_uint32;
+ append_composite_type_field (t, "u32", init_vector_type (elem, 4));
+ elem = builtin_type (gdbarch)->builtin_uint64;
+ append_composite_type_field (t, "u64", init_vector_type (elem, 2));
+ elem = builtin_type (gdbarch)->builtin_float;
+ append_composite_type_field (t, "f32", init_vector_type (elem, 4));
+ elem = builtin_type (gdbarch)->builtin_double;
+ append_composite_type_field (t, "f64", init_vector_type (elem, 2));
+
+ TYPE_VECTOR (t) = 1;
+ TYPE_NAME (t) = "neon_q";
+ tdep->neon_quad_type = t;
+ }
+
+ return tdep->neon_quad_type;
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+ register N. */
+
+static struct type *
+arm_register_type (struct gdbarch *gdbarch, int regnum)
+{
+ int num_regs = gdbarch_num_regs (gdbarch);
+
+ if (gdbarch_tdep (gdbarch)->have_vfp_pseudos
+ && regnum >= num_regs && regnum < num_regs + 32)
+ return builtin_type (gdbarch)->builtin_float;
+
+ if (gdbarch_tdep (gdbarch)->have_neon_pseudos
+ && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16)
+ return arm_neon_quad_type (gdbarch);
+
+ /* If the target description has register information, we are only
+ in this function so that we can override the types of
+ double-precision registers for NEON. */
+ if (tdesc_has_registers (gdbarch_target_desc (gdbarch)))
+ {
+ struct type *t = tdesc_register_type (gdbarch, regnum);
+
+ if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32
+ && TYPE_CODE (t) == TYPE_CODE_FLT
+ && gdbarch_tdep (gdbarch)->have_neon)
+ return arm_neon_double_type (gdbarch);
+ else
+ return t;
+ }
+
+ if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS)
+ {
+ if (!gdbarch_tdep (gdbarch)->have_fpa_registers)
+ return builtin_type (gdbarch)->builtin_void;
+
+ return arm_ext_type (gdbarch);
+ }
+ else if (regnum == ARM_SP_REGNUM)
+ return builtin_type (gdbarch)->builtin_data_ptr;
+ else if (regnum == ARM_PC_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
+ else if (regnum >= ARRAY_SIZE (arm_register_names))
+ /* These registers are only supported on targets which supply
+ an XML description. */
+ return builtin_type (gdbarch)->builtin_int0;
+ else
+ return builtin_type (gdbarch)->builtin_uint32;
+}
+
+/* Map a DWARF register REGNUM onto the appropriate GDB register
+ number. */
+
+static int
+arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+ /* Core integer regs. */
+ if (reg >= 0 && reg <= 15)
+ return reg;
+
+ /* Legacy FPA encoding. These were once used in a way which
+ overlapped with VFP register numbering, so their use is
+ discouraged, but GDB doesn't support the ARM toolchain
+ which used them for VFP. */
+ if (reg >= 16 && reg <= 23)
+ return ARM_F0_REGNUM + reg - 16;
+
+ /* New assignments for the FPA registers. */
+ if (reg >= 96 && reg <= 103)
+ return ARM_F0_REGNUM + reg - 96;
+
+ /* WMMX register assignments. */
+ if (reg >= 104 && reg <= 111)
+ return ARM_WCGR0_REGNUM + reg - 104;
+
+ if (reg >= 112 && reg <= 127)
+ return ARM_WR0_REGNUM + reg - 112;
+
+ if (reg >= 192 && reg <= 199)
+ return ARM_WC0_REGNUM + reg - 192;
+
+ /* VFP v2 registers. A double precision value is actually
+ in d1 rather than s2, but the ABI only defines numbering
+ for the single precision registers. This will "just work"
+ in GDB for little endian targets (we'll read eight bytes,
+ starting in s0 and then progressing to s1), but will be
+ reversed on big endian targets with VFP. This won't
+ be a problem for the new Neon quad registers; you're supposed
+ to use DW_OP_piece for those. */
+ if (reg >= 64 && reg <= 95)
+ {
+ char name_buf[4];
+
+ xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64);
+ return user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
+ }
+
+ /* VFP v3 / Neon registers. This range is also used for VFP v2
+ registers, except that it now describes d0 instead of s0. */
+ if (reg >= 256 && reg <= 287)
+ {
+ char name_buf[4];
+
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256);
+ return user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
+ }
+
+ return -1;
+}
+
+/* Map GDB internal REGNUM onto the Arm simulator register numbers. */
+static int
+arm_register_sim_regno (struct gdbarch *gdbarch, int regnum)
+{
+ int reg = regnum;
+ gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch));
+
+ if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM)
+ return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM;
+
+ if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM)
+ return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM;
+
+ if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM)
+ return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM;
+
+ if (reg < NUM_GREGS)
+ return SIM_ARM_R0_REGNUM + reg;
+ reg -= NUM_GREGS;
+
+ if (reg < NUM_FREGS)
+ return SIM_ARM_FP0_REGNUM + reg;
+ reg -= NUM_FREGS;
+
+ if (reg < NUM_SREGS)
+ return SIM_ARM_FPS_REGNUM + reg;
+ reg -= NUM_SREGS;
+
+ internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum);
+}
+
+/* NOTE: cagney/2001-08-20: Both convert_from_extended() and
+ convert_to_extended() use floatformat_arm_ext_littlebyte_bigword.
+ It is thought that this is is the floating-point register format on
+ little-endian systems. */
+
+static void
+convert_from_extended (const struct floatformat *fmt, const void *ptr,
+ void *dbl, int endianess)
+{
+ DOUBLEST d;
+
+ if (endianess == BFD_ENDIAN_BIG)
+ floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d);
+ else
+ floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword,
+ ptr, &d);
+ floatformat_from_doublest (fmt, &d, dbl);
+}
+
+static void
+convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr,
+ int endianess)
+{
+ DOUBLEST d;
+
+ floatformat_to_doublest (fmt, ptr, &d);
+ if (endianess == BFD_ENDIAN_BIG)
+ floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl);
+ else
+ floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword,
+ &d, dbl);
+}
+
+static int
+condition_true (unsigned long cond, unsigned long status_reg)
+{
+ if (cond == INST_AL || cond == INST_NV)
+ return 1;
+
+ switch (cond)
+ {
+ case INST_EQ:
+ return ((status_reg & FLAG_Z) != 0);
+ case INST_NE:
+ return ((status_reg & FLAG_Z) == 0);
+ case INST_CS:
+ return ((status_reg & FLAG_C) != 0);
+ case INST_CC:
+ return ((status_reg & FLAG_C) == 0);
+ case INST_MI:
+ return ((status_reg & FLAG_N) != 0);
+ case INST_PL:
+ return ((status_reg & FLAG_N) == 0);
+ case INST_VS:
+ return ((status_reg & FLAG_V) != 0);
+ case INST_VC:
+ return ((status_reg & FLAG_V) == 0);
+ case INST_HI:
+ return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C);
+ case INST_LS:
+ return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
+ case INST_GE:
+ return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
+ case INST_LT:
+ return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
+ case INST_GT:
+ return (((status_reg & FLAG_Z) == 0)
+ && (((status_reg & FLAG_N) == 0)
+ == ((status_reg & FLAG_V) == 0)));
+ case INST_LE:
+ return (((status_reg & FLAG_Z) != 0)
+ || (((status_reg & FLAG_N) == 0)
+ != ((status_reg & FLAG_V) == 0)));
+ }
+ return 1;
+}
+
+static unsigned long
+shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry,
+ unsigned long pc_val, unsigned long status_reg)
+{
+ unsigned long res, shift;
+ int rm = bits (inst, 0, 3);
+ unsigned long shifttype = bits (inst, 5, 6);
+
+ if (bit (inst, 4))
+ {
+ int rs = bits (inst, 8, 11);
+ shift = (rs == 15 ? pc_val + 8
+ : get_frame_register_unsigned (frame, rs)) & 0xFF;
+ }
+ else
+ shift = bits (inst, 7, 11);
+
+ res = (rm == ARM_PC_REGNUM
+ ? (pc_val + (bit (inst, 4) ? 12 : 8))
+ : get_frame_register_unsigned (frame, rm));
+
+ switch (shifttype)
+ {
+ case 0: /* LSL */
+ res = shift >= 32 ? 0 : res << shift;
+ break;
+
+ case 1: /* LSR */
+ res = shift >= 32 ? 0 : res >> shift;
+ break;
+
+ case 2: /* ASR */
+ if (shift >= 32)
+ shift = 31;
+ res = ((res & 0x80000000L)
+ ? ~((~res) >> shift) : res >> shift);
+ break;
+
+ case 3: /* ROR/RRX */
+ shift &= 31;
+ if (shift == 0)
+ res = (res >> 1) | (carry ? 0x80000000L : 0);
+ else
+ res = (res >> shift) | (res << (32 - shift));
+ break;
+ }
+
+ return res & 0xffffffff;
+}
+
+/* Return number of 1-bits in VAL. */
+
+static int
+bitcount (unsigned long val)
+{
+ int nbits;
+ for (nbits = 0; val != 0; nbits++)
+ val &= val - 1; /* Delete rightmost 1-bit in val. */
+ return nbits;
+}
+
+/* Return the size in bytes of the complete Thumb instruction whose
+ first halfword is INST1. */
+
+static int
+thumb_insn_size (unsigned short inst1)
+{
+ if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
+ return 4;
+ else
+ return 2;
+}
+
+static int
+thumb_advance_itstate (unsigned int itstate)
+{
+ /* Preserve IT[7:5], the first three bits of the condition. Shift
+ the upcoming condition flags left by one bit. */
+ itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f);
+
+ /* If we have finished the IT block, clear the state. */
+ if ((itstate & 0x0f) == 0)
+ itstate = 0;
+
+ return itstate;
+}
+
+/* Find the next PC after the current instruction executes. In some
+ cases we can not statically determine the answer (see the IT state
+ handling in this function); in that case, a breakpoint may be
+ inserted in addition to the returned PC, which will be used to set
+ another breakpoint by our caller. */
+
+static CORE_ADDR
+thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct address_space *aspace = get_frame_address_space (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */
+ unsigned short inst1;
+ CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */
+ unsigned long offset;
+ ULONGEST status, itstate;
+
+ nextpc = MAKE_THUMB_ADDR (nextpc);
+ pc_val = MAKE_THUMB_ADDR (pc_val);
+
+ inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code);
+
+ /* Thumb-2 conditional execution support. There are eight bits in
+ the CPSR which describe conditional execution state. Once
+ reconstructed (they're in a funny order), the low five bits
+ describe the low bit of the condition for each instruction and
+ how many instructions remain. The high three bits describe the
+ base condition. One of the low four bits will be set if an IT
+ block is active. These bits read as zero on earlier
+ processors. */
+ status = get_frame_register_unsigned (frame, ARM_PS_REGNUM);
+ itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3);
+
+ /* If-Then handling. On GNU/Linux, where this routine is used, we
+ use an undefined instruction as a breakpoint. Unlike BKPT, IT
+ can disable execution of the undefined instruction. So we might
+ miss the breakpoint if we set it on a skipped conditional
+ instruction. Because conditional instructions can change the
+ flags, affecting the execution of further instructions, we may
+ need to set two breakpoints. */
+
+ if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL)
+ {
+ if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
+ {
+ /* An IT instruction. Because this instruction does not
+ modify the flags, we can accurately predict the next
+ executed instruction. */
+ itstate = inst1 & 0x00ff;
+ pc += thumb_insn_size (inst1);
+
+ while (itstate != 0 && ! condition_true (itstate >> 4, status))
+ {
+ inst1 = read_memory_unsigned_integer (pc, 2,
+ byte_order_for_code);
+ pc += thumb_insn_size (inst1);
+ itstate = thumb_advance_itstate (itstate);
+ }
+
+ return MAKE_THUMB_ADDR (pc);
+ }
+ else if (itstate != 0)
+ {
+ /* We are in a conditional block. Check the condition. */
+ if (! condition_true (itstate >> 4, status))
+ {
+ /* Advance to the next executed instruction. */
+ pc += thumb_insn_size (inst1);
+ itstate = thumb_advance_itstate (itstate);
+
+ while (itstate != 0 && ! condition_true (itstate >> 4, status))
+ {
+ inst1 = read_memory_unsigned_integer (pc, 2,
+ byte_order_for_code);
+ pc += thumb_insn_size (inst1);
+ itstate = thumb_advance_itstate (itstate);
+ }
+
+ return MAKE_THUMB_ADDR (pc);
+ }
+ else if ((itstate & 0x0f) == 0x08)
+ {
+ /* This is the last instruction of the conditional
+ block, and it is executed. We can handle it normally
+ because the following instruction is not conditional,
+ and we must handle it normally because it is
+ permitted to branch. Fall through. */
+ }
+ else
+ {
+ int cond_negated;
+
+ /* There are conditional instructions after this one.
+ If this instruction modifies the flags, then we can
+ not predict what the next executed instruction will
+ be. Fortunately, this instruction is architecturally
+ forbidden to branch; we know it will fall through.
+ Start by skipping past it. */
+ pc += thumb_insn_size (inst1);
+ itstate = thumb_advance_itstate (itstate);
+
+ /* Set a breakpoint on the following instruction. */
+ gdb_assert ((itstate & 0x0f) != 0);
+ arm_insert_single_step_breakpoint (gdbarch, aspace,
+ MAKE_THUMB_ADDR (pc));
+ cond_negated = (itstate >> 4) & 1;
+
+ /* Skip all following instructions with the same
+ condition. If there is a later instruction in the IT
+ block with the opposite condition, set the other
+ breakpoint there. If not, then set a breakpoint on
+ the instruction after the IT block. */
+ do
+ {
+ inst1 = read_memory_unsigned_integer (pc, 2,
+ byte_order_for_code);
+ pc += thumb_insn_size (inst1);
+ itstate = thumb_advance_itstate (itstate);
+ }
+ while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated);
+
+ return MAKE_THUMB_ADDR (pc);
+ }
+ }
+ }
+ else if (itstate & 0x0f)
+ {
+ /* We are in a conditional block. Check the condition. */
+ int cond = itstate >> 4;
+
+ if (! condition_true (cond, status))
+ /* Advance to the next instruction. All the 32-bit
+ instructions share a common prefix. */
+ return MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1));
+
+ /* Otherwise, handle the instruction normally. */
+ }
+
+ if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */
+ {
+ CORE_ADDR sp;
+
+ /* Fetch the saved PC from the stack. It's stored above
+ all of the other registers. */
+ offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE;
+ sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM);
+ nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order);
+ }
+ else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */
+ {
+ unsigned long cond = bits (inst1, 8, 11);
+ if (cond == 0x0f) /* 0x0f = SWI */
+ {
+ struct gdbarch_tdep *tdep;
+ tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->syscall_next_pc != NULL)
+ nextpc = tdep->syscall_next_pc (frame);
+
+ }
+ else if (cond != 0x0f && condition_true (cond, status))
+ nextpc = pc_val + (sbits (inst1, 0, 7) << 1);
+ }
+ else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */
+ {
+ nextpc = pc_val + (sbits (inst1, 0, 10) << 1);
+ }
+ else if (thumb_insn_size (inst1) == 4) /* 32-bit instruction */
+ {
+ unsigned short inst2;
+ inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code);
+
+ /* Default to the next instruction. */
+ nextpc = pc + 4;
+ nextpc = MAKE_THUMB_ADDR (nextpc);
+
+ if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000)
+ {
+ /* Branches and miscellaneous control instructions. */
+
+ if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000)
+ {
+ /* B, BL, BLX. */
+ int j1, j2, imm1, imm2;
+
+ imm1 = sbits (inst1, 0, 10);
+ imm2 = bits (inst2, 0, 10);
+ j1 = bit (inst2, 13);
+ j2 = bit (inst2, 11);
+
+ offset = ((imm1 << 12) + (imm2 << 1));
+ offset ^= ((!j2) << 22) | ((!j1) << 23);
+
+ nextpc = pc_val + offset;
+ /* For BLX make sure to clear the low bits. */
+ if (bit (inst2, 12) == 0)
+ nextpc = nextpc & 0xfffffffc;
+ }
+ else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00)
+ {
+ /* SUBS PC, LR, #imm8. */
+ nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM);
+ nextpc -= inst2 & 0x00ff;
+ }
+ else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380)
+ {
+ /* Conditional branch. */
+ if (condition_true (bits (inst1, 6, 9), status))
+ {
+ int sign, j1, j2, imm1, imm2;
+
+ sign = sbits (inst1, 10, 10);
+ imm1 = bits (inst1, 0, 5);
+ imm2 = bits (inst2, 0, 10);
+ j1 = bit (inst2, 13);
+ j2 = bit (inst2, 11);
+
+ offset = (sign << 20) + (j2 << 19) + (j1 << 18);
+ offset += (imm1 << 12) + (imm2 << 1);
+
+ nextpc = pc_val + offset;
+ }
+ }
+ }
+ else if ((inst1 & 0xfe50) == 0xe810)
+ {
+ /* Load multiple or RFE. */
+ int rn, offset, load_pc = 1;
+
+ rn = bits (inst1, 0, 3);
+ if (bit (inst1, 7) && !bit (inst1, 8))
+ {
+ /* LDMIA or POP */
+ if (!bit (inst2, 15))
+ load_pc = 0;
+ offset = bitcount (inst2) * 4 - 4;
+ }
+ else if (!bit (inst1, 7) && bit (inst1, 8))
+ {
+ /* LDMDB */
+ if (!bit (inst2, 15))
+ load_pc = 0;
+ offset = -4;
+ }
+ else if (bit (inst1, 7) && bit (inst1, 8))
+ {
+ /* RFEIA */
+ offset = 0;
+ }
+ else if (!bit (inst1, 7) && !bit (inst1, 8))
+ {
+ /* RFEDB */
+ offset = -8;
+ }
+ else
+ load_pc = 0;
+
+ if (load_pc)
+ {
+ CORE_ADDR addr = get_frame_register_unsigned (frame, rn);
+ nextpc = get_frame_memory_unsigned (frame, addr + offset, 4);
+ }
+ }
+ else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00)
+ {
+ /* MOV PC or MOVS PC. */
+ nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3));
+ nextpc = MAKE_THUMB_ADDR (nextpc);
+ }
+ else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000)
+ {
+ /* LDR PC. */
+ CORE_ADDR base;
+ int rn, load_pc = 1;
+
+ rn = bits (inst1, 0, 3);
+ base = get_frame_register_unsigned (frame, rn);
+ if (rn == ARM_PC_REGNUM)
+ {
+ base = (base + 4) & ~(CORE_ADDR) 0x3;
+ if (bit (inst1, 7))
+ base += bits (inst2, 0, 11);
+ else
+ base -= bits (inst2, 0, 11);
+ }
+ else if (bit (inst1, 7))
+ base += bits (inst2, 0, 11);
+ else if (bit (inst2, 11))
+ {
+ if (bit (inst2, 10))
+ {
+ if (bit (inst2, 9))
+ base += bits (inst2, 0, 7);
+ else
+ base -= bits (inst2, 0, 7);
+ }
+ }
+ else if ((inst2 & 0x0fc0) == 0x0000)
+ {
+ int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3);
+ base += get_frame_register_unsigned (frame, rm) << shift;
+ }
+ else
+ /* Reserved. */
+ load_pc = 0;
+
+ if (load_pc)
+ nextpc = get_frame_memory_unsigned (frame, base, 4);
+ }
+ else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000)
+ {
+ /* TBB. */
+ CORE_ADDR tbl_reg, table, offset, length;
+
+ tbl_reg = bits (inst1, 0, 3);
+ if (tbl_reg == 0x0f)
+ table = pc + 4; /* Regcache copy of PC isn't right yet. */
+ else
+ table = get_frame_register_unsigned (frame, tbl_reg);
+
+ offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3));
+ length = 2 * get_frame_memory_unsigned (frame, table + offset, 1);
+ nextpc = pc_val + length;
+ }
+ else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010)
+ {
+ /* TBH. */
+ CORE_ADDR tbl_reg, table, offset, length;
+
+ tbl_reg = bits (inst1, 0, 3);
+ if (tbl_reg == 0x0f)
+ table = pc + 4; /* Regcache copy of PC isn't right yet. */
+ else
+ table = get_frame_register_unsigned (frame, tbl_reg);
+
+ offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3));
+ length = 2 * get_frame_memory_unsigned (frame, table + offset, 2);
+ nextpc = pc_val + length;
+ }
+ }
+ else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */
+ {
+ if (bits (inst1, 3, 6) == 0x0f)
+ nextpc = UNMAKE_THUMB_ADDR (pc_val);
+ else
+ nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6));
+ }
+ else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */
+ {
+ if (bits (inst1, 3, 6) == 0x0f)
+ nextpc = pc_val;
+ else
+ nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6));
+
+ nextpc = MAKE_THUMB_ADDR (nextpc);
+ }
+ else if ((inst1 & 0xf500) == 0xb100)
+ {
+ /* CBNZ or CBZ. */
+ int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1);
+ ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2));
+
+ if (bit (inst1, 11) && reg != 0)
+ nextpc = pc_val + imm;
+ else if (!bit (inst1, 11) && reg == 0)
+ nextpc = pc_val + imm;
+ }
+ return nextpc;
+}
+
+/* Get the raw next address. PC is the current program counter, in
+ FRAME, which is assumed to be executing in ARM mode.
+
+ The value returned has the execution state of the next instruction
+ encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is
+ in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory
+ address. */
+
+static CORE_ADDR
+arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ unsigned long pc_val;
+ unsigned long this_instr;
+ unsigned long status;
+ CORE_ADDR nextpc;
+
+ pc_val = (unsigned long) pc;
+ this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
+
+ status = get_frame_register_unsigned (frame, ARM_PS_REGNUM);
+ nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */
+
+ if (bits (this_instr, 28, 31) == INST_NV)
+ switch (bits (this_instr, 24, 27))
+ {
+ case 0xa:
+ case 0xb:
+ {
+ /* Branch with Link and change to Thumb. */
+ nextpc = BranchDest (pc, this_instr);
+ nextpc |= bit (this_instr, 24) << 1;
+ nextpc = MAKE_THUMB_ADDR (nextpc);
+ break;
+ }
+ case 0xc:
+ case 0xd:
+ case 0xe:
+ /* Coprocessor register transfer. */
+ if (bits (this_instr, 12, 15) == 15)
+ error (_("Invalid update to pc in instruction"));
+ break;
+ }
+ else if (condition_true (bits (this_instr, 28, 31), status))
+ {
+ switch (bits (this_instr, 24, 27))
+ {
+ case 0x0:
+ case 0x1: /* data processing */
+ case 0x2:
+ case 0x3:
+ {
+ unsigned long operand1, operand2, result = 0;
+ unsigned long rn;
+ int c;
+
+ if (bits (this_instr, 12, 15) != 15)
+ break;
+
+ if (bits (this_instr, 22, 25) == 0
+ && bits (this_instr, 4, 7) == 9) /* multiply */
+ error (_("Invalid update to pc in instruction"));
+
+ /* BX <reg>, BLX <reg> */
+ if (bits (this_instr, 4, 27) == 0x12fff1
+ || bits (this_instr, 4, 27) == 0x12fff3)
+ {
+ rn = bits (this_instr, 0, 3);
+ nextpc = ((rn == ARM_PC_REGNUM)
+ ? (pc_val + 8)
+ : get_frame_register_unsigned (frame, rn));
+
+ return nextpc;
+ }
+
+ /* Multiply into PC. */
+ c = (status & FLAG_C) ? 1 : 0;
+ rn = bits (this_instr, 16, 19);
+ operand1 = ((rn == ARM_PC_REGNUM)
+ ? (pc_val + 8)
+ : get_frame_register_unsigned (frame, rn));
+
+ if (bit (this_instr, 25))
+ {
+ unsigned long immval = bits (this_instr, 0, 7);
+ unsigned long rotate = 2 * bits (this_instr, 8, 11);
+ operand2 = ((immval >> rotate) | (immval << (32 - rotate)))
+ & 0xffffffff;
+ }
+ else /* operand 2 is a shifted register. */
+ operand2 = shifted_reg_val (frame, this_instr, c,
+ pc_val, status);
+
+ switch (bits (this_instr, 21, 24))
+ {
+ case 0x0: /*and */
+ result = operand1 & operand2;
+ break;
+
+ case 0x1: /*eor */
+ result = operand1 ^ operand2;
+ break;
+
+ case 0x2: /*sub */
+ result = operand1 - operand2;
+ break;
+
+ case 0x3: /*rsb */
+ result = operand2 - operand1;
+ break;
+
+ case 0x4: /*add */
+ result = operand1 + operand2;
+ break;
+
+ case 0x5: /*adc */
+ result = operand1 + operand2 + c;
+ break;
+
+ case 0x6: /*sbc */
+ result = operand1 - operand2 + c;
+ break;
+
+ case 0x7: /*rsc */
+ result = operand2 - operand1 + c;
+ break;
+
+ case 0x8:
+ case 0x9:
+ case 0xa:
+ case 0xb: /* tst, teq, cmp, cmn */
+ result = (unsigned long) nextpc;
+ break;
+
+ case 0xc: /*orr */
+ result = operand1 | operand2;
+ break;
+
+ case 0xd: /*mov */
+ /* Always step into a function. */
+ result = operand2;
+ break;
+
+ case 0xe: /*bic */
+ result = operand1 & ~operand2;
+ break;
+
+ case 0xf: /*mvn */
+ result = ~operand2;
+ break;
+ }
+
+ /* In 26-bit APCS the bottom two bits of the result are
+ ignored, and we always end up in ARM state. */
+ if (!arm_apcs_32)
+ nextpc = arm_addr_bits_remove (gdbarch, result);
+ else
+ nextpc = result;
+
+ break;
+ }
+
+ case 0x4:
+ case 0x5: /* data transfer */
+ case 0x6:
+ case 0x7:
+ if (bit (this_instr, 20))
+ {
+ /* load */
+ if (bits (this_instr, 12, 15) == 15)
+ {
+ /* rd == pc */
+ unsigned long rn;
+ unsigned long base;
+
+ if (bit (this_instr, 22))
+ error (_("Invalid update to pc in instruction"));
+
+ /* byte write to PC */
+ rn = bits (this_instr, 16, 19);
+ base = ((rn == ARM_PC_REGNUM)
+ ? (pc_val + 8)
+ : get_frame_register_unsigned (frame, rn));
+
+ if (bit (this_instr, 24))
+ {
+ /* pre-indexed */
+ int c = (status & FLAG_C) ? 1 : 0;
+ unsigned long offset =
+ (bit (this_instr, 25)
+ ? shifted_reg_val (frame, this_instr, c, pc_val, status)
+ : bits (this_instr, 0, 11));
+
+ if (bit (this_instr, 23))
+ base += offset;
+ else
+ base -= offset;
+ }
+ nextpc =
+ (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) base,
+ 4, byte_order);
+ }
+ }
+ break;
+
+ case 0x8:
+ case 0x9: /* block transfer */
+ if (bit (this_instr, 20))
+ {
+ /* LDM */
+ if (bit (this_instr, 15))
+ {
+ /* loading pc */
+ int offset = 0;
+ unsigned long rn_val
+ = get_frame_register_unsigned (frame,
+ bits (this_instr, 16, 19));
+
+ if (bit (this_instr, 23))
+ {
+ /* up */
+ unsigned long reglist = bits (this_instr, 0, 14);
+ offset = bitcount (reglist) * 4;
+ if (bit (this_instr, 24)) /* pre */
+ offset += 4;
+ }
+ else if (bit (this_instr, 24))
+ offset = -4;
+
+ nextpc =
+ (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR)
+ (rn_val + offset),
+ 4, byte_order);
+ }
+ }
+ break;
+
+ case 0xb: /* branch & link */
+ case 0xa: /* branch */
+ {
+ nextpc = BranchDest (pc, this_instr);
+ break;
+ }
+
+ case 0xc:
+ case 0xd:
+ case 0xe: /* coproc ops */
+ break;
+ case 0xf: /* SWI */
+ {
+ struct gdbarch_tdep *tdep;
+ tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->syscall_next_pc != NULL)
+ nextpc = tdep->syscall_next_pc (frame);
+
+ }
+ break;
+
+ default:
+ fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n"));
+ return (pc);
+ }
+ }
+
+ return nextpc;
+}
+
+/* Determine next PC after current instruction executes. Will call either
+ arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite
+ loop is detected. */
+
+CORE_ADDR
+arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc)
+{
+ CORE_ADDR nextpc;
+
+ if (arm_frame_is_thumb (frame))
+ nextpc = thumb_get_next_pc_raw (frame, pc);
+ else
+ nextpc = arm_get_next_pc_raw (frame, pc);
+
+ return nextpc;
+}
+
+/* Like insert_single_step_breakpoint, but make sure we use a breakpoint
+ of the appropriate mode (as encoded in the PC value), even if this
+ differs from what would be expected according to the symbol tables. */
+
+void
+arm_insert_single_step_breakpoint (struct gdbarch *gdbarch,
+ struct address_space *aspace,
+ CORE_ADDR pc)
+{
+ struct cleanup *old_chain
+ = make_cleanup_restore_integer (&arm_override_mode);
+
+ arm_override_mode = IS_THUMB_ADDR (pc);
+ pc = gdbarch_addr_bits_remove (gdbarch, pc);
+
+ insert_single_step_breakpoint (gdbarch, aspace, pc);
+
+ do_cleanups (old_chain);
+}
+
+/* Checks for an atomic sequence of instructions beginning with a LDREX{,B,H,D}
+ instruction and ending with a STREX{,B,H,D} instruction. If such a sequence
+ is found, attempt to step through it. A breakpoint is placed at the end of
+ the sequence. */
+
+static int
+thumb_deal_with_atomic_sequence_raw (struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct address_space *aspace = get_frame_address_space (frame);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ CORE_ADDR pc = get_frame_pc (frame);
+ CORE_ADDR breaks[2] = {-1, -1};
+ CORE_ADDR loc = pc;
+ unsigned short insn1, insn2;
+ int insn_count;
+ int index;
+ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
+ const int atomic_sequence_length = 16; /* Instruction sequence length. */
+ ULONGEST status, itstate;
+
+ /* We currently do not support atomic sequences within an IT block. */
+ status = get_frame_register_unsigned (frame, ARM_PS_REGNUM);
+ itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3);
+ if (itstate & 0x0f)
+ return 0;
+
+ /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. */
+ insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code);
+ loc += 2;
+ if (thumb_insn_size (insn1) != 4)
+ return 0;
+
+ insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code);
+ loc += 2;
+ if (!((insn1 & 0xfff0) == 0xe850
+ || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040)))
+ return 0;
+
+ /* Assume that no atomic sequence is longer than "atomic_sequence_length"
+ instructions. */
+ for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
+ {
+ insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code);
+ loc += 2;
+
+ if (thumb_insn_size (insn1) != 4)
+ {
+ /* Assume that there is at most one conditional branch in the
+ atomic sequence. If a conditional branch is found, put a
+ breakpoint in its destination address. */
+ if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f)
+ {
+ if (last_breakpoint > 0)
+ return 0; /* More than one conditional branch found,
+ fallback to the standard code. */
+
+ breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1);
+ last_breakpoint++;
+ }
+
+ /* We do not support atomic sequences that use any *other*
+ instructions but conditional branches to change the PC.
+ Fall back to standard code to avoid losing control of
+ execution. */
+ else if (thumb_instruction_changes_pc (insn1))
+ return 0;
+ }
+ else
+ {
+ insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code);
+ loc += 2;
+
+ /* Assume that there is at most one conditional branch in the
+ atomic sequence. If a conditional branch is found, put a
+ breakpoint in its destination address. */
+ if ((insn1 & 0xf800) == 0xf000
+ && (insn2 & 0xd000) == 0x8000
+ && (insn1 & 0x0380) != 0x0380)
+ {
+ int sign, j1, j2, imm1, imm2;
+ unsigned int offset;
+
+ sign = sbits (insn1, 10, 10);
+ imm1 = bits (insn1, 0, 5);
+ imm2 = bits (insn2, 0, 10);
+ j1 = bit (insn2, 13);
+ j2 = bit (insn2, 11);
+
+ offset = (sign << 20) + (j2 << 19) + (j1 << 18);
+ offset += (imm1 << 12) + (imm2 << 1);
+
+ if (last_breakpoint > 0)
+ return 0; /* More than one conditional branch found,
+ fallback to the standard code. */
+
+ breaks[1] = loc + offset;
+ last_breakpoint++;
+ }
+
+ /* We do not support atomic sequences that use any *other*
+ instructions but conditional branches to change the PC.
+ Fall back to standard code to avoid losing control of
+ execution. */
+ else if (thumb2_instruction_changes_pc (insn1, insn2))
+ return 0;
+
+ /* If we find a strex{,b,h,d}, we're done. */
+ if ((insn1 & 0xfff0) == 0xe840
+ || ((insn1 & 0xfff0) == 0xe8c0 && (insn2 & 0x00c0) == 0x0040))
+ break;
+ }
+ }
+
+ /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */
+ if (insn_count == atomic_sequence_length)
+ return 0;
+
+ /* Insert a breakpoint right after the end of the atomic sequence. */
+ breaks[0] = loc;
+
+ /* Check for duplicated breakpoints. Check also for a breakpoint
+ placed (branch instruction's destination) anywhere in sequence. */
+ if (last_breakpoint
+ && (breaks[1] == breaks[0]
+ || (breaks[1] >= pc && breaks[1] < loc)))
+ last_breakpoint = 0;
+
+ /* Effectively inserts the breakpoints. */
+ for (index = 0; index <= last_breakpoint; index++)
+ arm_insert_single_step_breakpoint (gdbarch, aspace,
+ MAKE_THUMB_ADDR (breaks[index]));
+
+ return 1;
+}
+
+static int
+arm_deal_with_atomic_sequence_raw (struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct address_space *aspace = get_frame_address_space (frame);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ CORE_ADDR pc = get_frame_pc (frame);
+ CORE_ADDR breaks[2] = {-1, -1};
+ CORE_ADDR loc = pc;
+ unsigned int insn;
+ int insn_count;
+ int index;
+ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
+ const int atomic_sequence_length = 16; /* Instruction sequence length. */
+
+ /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction.
+ Note that we do not currently support conditionally executed atomic
+ instructions. */
+ insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code);
+ loc += 4;
+ if ((insn & 0xff9000f0) != 0xe1900090)
+ return 0;
+
+ /* Assume that no atomic sequence is longer than "atomic_sequence_length"
+ instructions. */
+ for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
+ {
+ insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code);
+ loc += 4;
+
+ /* Assume that there is at most one conditional branch in the atomic
+ sequence. If a conditional branch is found, put a breakpoint in
+ its destination address. */
+ if (bits (insn, 24, 27) == 0xa)
+ {
+ if (last_breakpoint > 0)
+ return 0; /* More than one conditional branch found, fallback
+ to the standard single-step code. */
+
+ breaks[1] = BranchDest (loc - 4, insn);
+ last_breakpoint++;
+ }
+
+ /* We do not support atomic sequences that use any *other* instructions
+ but conditional branches to change the PC. Fall back to standard
+ code to avoid losing control of execution. */
+ else if (arm_instruction_changes_pc (insn))
+ return 0;
+
+ /* If we find a strex{,b,h,d}, we're done. */
+ if ((insn & 0xff9000f0) == 0xe1800090)
+ break;
+ }
+
+ /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */
+ if (insn_count == atomic_sequence_length)
+ return 0;
+
+ /* Insert a breakpoint right after the end of the atomic sequence. */
+ breaks[0] = loc;
+
+ /* Check for duplicated breakpoints. Check also for a breakpoint
+ placed (branch instruction's destination) anywhere in sequence. */
+ if (last_breakpoint
+ && (breaks[1] == breaks[0]
+ || (breaks[1] >= pc && breaks[1] < loc)))
+ last_breakpoint = 0;
+
+ /* Effectively inserts the breakpoints. */
+ for (index = 0; index <= last_breakpoint; index++)
+ arm_insert_single_step_breakpoint (gdbarch, aspace, breaks[index]);
+
+ return 1;
+}
+
+int
+arm_deal_with_atomic_sequence (struct frame_info *frame)
+{
+ if (arm_frame_is_thumb (frame))
+ return thumb_deal_with_atomic_sequence_raw (frame);
+ else
+ return arm_deal_with_atomic_sequence_raw (frame);
+}
+
+/* single_step() is called just before we want to resume the inferior,
+ if we want to single-step it but there is no hardware or kernel
+ single-step support. We find the target of the coming instruction
+ and breakpoint it. */
+
+int
+arm_software_single_step (struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct address_space *aspace = get_frame_address_space (frame);
+ CORE_ADDR next_pc;
+
+ if (arm_deal_with_atomic_sequence (frame))
+ return 1;
+
+ next_pc = arm_get_next_pc (frame, get_frame_pc (frame));
+ arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc);
+
+ return 1;
+}
+
+/* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand
+ the buffer to be NEW_LEN bytes ending at ENDADDR. Return
+ NULL if an error occurs. BUF is freed. */
+
+static gdb_byte *
+extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr,
+ int old_len, int new_len)
+{
+ gdb_byte *new_buf;
+ int bytes_to_read = new_len - old_len;
+
+ new_buf = xmalloc (new_len);
+ memcpy (new_buf + bytes_to_read, buf, old_len);
+ xfree (buf);
+ if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0)
+ {
+ xfree (new_buf);
+ return NULL;
+ }
+ return new_buf;
+}
+
+/* An IT block is at most the 2-byte IT instruction followed by
+ four 4-byte instructions. The furthest back we must search to
+ find an IT block that affects the current instruction is thus
+ 2 + 3 * 4 == 14 bytes. */
+#define MAX_IT_BLOCK_PREFIX 14
+
+/* Use a quick scan if there are more than this many bytes of
+ code. */
+#define IT_SCAN_THRESHOLD 32
+
+/* Adjust a breakpoint's address to move breakpoints out of IT blocks.
+ A breakpoint in an IT block may not be hit, depending on the
+ condition flags. */
+static CORE_ADDR
+arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
+{
+ gdb_byte *buf;
+ char map_type;
+ CORE_ADDR boundary, func_start;
+ int buf_len;
+ enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch);
+ int i, any, last_it, last_it_count;
+
+ /* If we are using BKPT breakpoints, none of this is necessary. */
+ if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL)
+ return bpaddr;
+
+ /* ARM mode does not have this problem. */
+ if (!arm_pc_is_thumb (gdbarch, bpaddr))
+ return bpaddr;
+
+ /* We are setting a breakpoint in Thumb code that could potentially
+ contain an IT block. The first step is to find how much Thumb
+ code there is; we do not need to read outside of known Thumb
+ sequences. */
+ map_type = arm_find_mapping_symbol (bpaddr, &boundary);
+ if (map_type == 0)
+ /* Thumb-2 code must have mapping symbols to have a chance. */
+ return bpaddr;
+
+ bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr);
+
+ if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL)
+ && func_start > boundary)
+ boundary = func_start;
+
+ /* Search for a candidate IT instruction. We have to do some fancy
+ footwork to distinguish a real IT instruction from the second
+ half of a 32-bit instruction, but there is no need for that if
+ there's no candidate. */
+ buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX);
+ if (buf_len == 0)
+ /* No room for an IT instruction. */
+ return bpaddr;
+
+ buf = xmalloc (buf_len);
+ if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0)
+ return bpaddr;
+ any = 0;
+ for (i = 0; i < buf_len; i += 2)
+ {
+ unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
+ if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
+ {
+ any = 1;
+ break;
+ }
+ }
+ if (any == 0)
+ {
+ xfree (buf);
+ return bpaddr;
+ }
+
+ /* OK, the code bytes before this instruction contain at least one
+ halfword which resembles an IT instruction. We know that it's
+ Thumb code, but there are still two possibilities. Either the
+ halfword really is an IT instruction, or it is the second half of
+ a 32-bit Thumb instruction. The only way we can tell is to
+ scan forwards from a known instruction boundary. */
+ if (bpaddr - boundary > IT_SCAN_THRESHOLD)
+ {
+ int definite;
+
+ /* There's a lot of code before this instruction. Start with an
+ optimistic search; it's easy to recognize halfwords that can
+ not be the start of a 32-bit instruction, and use that to
+ lock on to the instruction boundaries. */
+ buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD);
+ if (buf == NULL)
+ return bpaddr;
+ buf_len = IT_SCAN_THRESHOLD;
+
+ definite = 0;
+ for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2)
+ {
+ unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
+ if (thumb_insn_size (inst1) == 2)
{
- /* B, BL, BLX. */
- int j1, j2, imm1, imm2;
+ definite = 1;
+ break;
+ }
+ }
+
+ /* At this point, if DEFINITE, BUF[I] is the first place we
+ are sure that we know the instruction boundaries, and it is far
+ enough from BPADDR that we could not miss an IT instruction
+ affecting BPADDR. If ! DEFINITE, give up - start from a
+ known boundary. */
+ if (! definite)
+ {
+ buf = extend_buffer_earlier (buf, bpaddr, buf_len,
+ bpaddr - boundary);
+ if (buf == NULL)
+ return bpaddr;
+ buf_len = bpaddr - boundary;
+ i = 0;
+ }
+ }
+ else
+ {
+ buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary);
+ if (buf == NULL)
+ return bpaddr;
+ buf_len = bpaddr - boundary;
+ i = 0;
+ }
+
+ /* Scan forwards. Find the last IT instruction before BPADDR. */
+ last_it = -1;
+ last_it_count = 0;
+ while (i < buf_len)
+ {
+ unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
+ last_it_count--;
+ if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
+ {
+ last_it = i;
+ if (inst1 & 0x0001)
+ last_it_count = 4;
+ else if (inst1 & 0x0002)
+ last_it_count = 3;
+ else if (inst1 & 0x0004)
+ last_it_count = 2;
+ else
+ last_it_count = 1;
+ }
+ i += thumb_insn_size (inst1);
+ }
+
+ xfree (buf);
+
+ if (last_it == -1)
+ /* There wasn't really an IT instruction after all. */
+ return bpaddr;
+
+ if (last_it_count < 1)
+ /* It was too far away. */
+ return bpaddr;
+
+ /* This really is a trouble spot. Move the breakpoint to the IT
+ instruction. */
+ return bpaddr - buf_len + last_it;
+}
+
+/* ARM displaced stepping support.
+
+ Generally ARM displaced stepping works as follows:
+
+ 1. When an instruction is to be single-stepped, it is first decoded by
+ arm_process_displaced_insn (called from arm_displaced_step_copy_insn).
+ Depending on the type of instruction, it is then copied to a scratch
+ location, possibly in a modified form. The copy_* set of functions
+ performs such modification, as necessary. A breakpoint is placed after
+ the modified instruction in the scratch space to return control to GDB.
+ Note in particular that instructions which modify the PC will no longer
+ do so after modification.
+
+ 2. The instruction is single-stepped, by setting the PC to the scratch
+ location address, and resuming. Control returns to GDB when the
+ breakpoint is hit.
+
+ 3. A cleanup function (cleanup_*) is called corresponding to the copy_*
+ function used for the current instruction. This function's job is to
+ put the CPU/memory state back to what it would have been if the
+ instruction had been executed unmodified in its original location. */
+
+/* NOP instruction (mov r0, r0). */
+#define ARM_NOP 0xe1a00000
+#define THUMB_NOP 0x4600
+
+/* Helper for register reads for displaced stepping. In particular, this
+ returns the PC as it would be seen by the instruction at its original
+ location. */
+
+ULONGEST
+displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc,
+ int regno)
+{
+ ULONGEST ret;
+ CORE_ADDR from = dsc->insn_addr;
+
+ if (regno == ARM_PC_REGNUM)
+ {
+ /* Compute pipeline offset:
+ - When executing an ARM instruction, PC reads as the address of the
+ current instruction plus 8.
+ - When executing a Thumb instruction, PC reads as the address of the
+ current instruction plus 4. */
+
+ if (!dsc->is_thumb)
+ from += 8;
+ else
+ from += 4;
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n",
+ (unsigned long) from);
+ return (ULONGEST) from;
+ }
+ else
+ {
+ regcache_cooked_read_unsigned (regs, regno, &ret);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n",
+ regno, (unsigned long) ret);
+ return ret;
+ }
+}
+
+static int
+displaced_in_arm_mode (struct regcache *regs)
+{
+ ULONGEST ps;
+ ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs));
+
+ regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps);
+
+ return (ps & t_bit) == 0;
+}
+
+/* Write to the PC as from a branch instruction. */
+
+static void
+branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc,
+ ULONGEST val)
+{
+ if (!dsc->is_thumb)
+ /* Note: If bits 0/1 are set, this branch would be unpredictable for
+ architecture versions < 6. */
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM,
+ val & ~(ULONGEST) 0x3);
+ else
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM,
+ val & ~(ULONGEST) 0x1);
+}
+
+/* Write to the PC as from a branch-exchange instruction. */
+
+static void
+bx_write_pc (struct regcache *regs, ULONGEST val)
+{
+ ULONGEST ps;
+ ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs));
+
+ regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps);
+
+ if ((val & 1) == 1)
+ {
+ regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit);
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe);
+ }
+ else if ((val & 2) == 0)
+ {
+ regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit);
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val);
+ }
+ else
+ {
+ /* Unpredictable behaviour. Try to do something sensible (switch to ARM
+ mode, align dest to 4 bytes). */
+ warning (_("Single-stepping BX to non-word-aligned ARM instruction."));
+ regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit);
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc);
+ }
+}
+
+/* Write to the PC as if from a load instruction. */
+
+static void
+load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc,
+ ULONGEST val)
+{
+ if (DISPLACED_STEPPING_ARCH_VERSION >= 5)
+ bx_write_pc (regs, val);
+ else
+ branch_write_pc (regs, dsc, val);
+}
+
+/* Write to the PC as if from an ALU instruction. */
+
+static void
+alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc,
+ ULONGEST val)
+{
+ if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb)
+ bx_write_pc (regs, val);
+ else
+ branch_write_pc (regs, dsc, val);
+}
+
+/* Helper for writing to registers for displaced stepping. Writing to the PC
+ has a varying effects depending on the instruction which does the write:
+ this is controlled by the WRITE_PC argument. */
+
+void
+displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc,
+ int regno, ULONGEST val, enum pc_write_style write_pc)
+{
+ if (regno == ARM_PC_REGNUM)
+ {
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n",
+ (unsigned long) val);
+ switch (write_pc)
+ {
+ case BRANCH_WRITE_PC:
+ branch_write_pc (regs, dsc, val);
+ break;
+
+ case BX_WRITE_PC:
+ bx_write_pc (regs, val);
+ break;
+
+ case LOAD_WRITE_PC:
+ load_write_pc (regs, dsc, val);
+ break;
+
+ case ALU_WRITE_PC:
+ alu_write_pc (regs, dsc, val);
+ break;
+
+ case CANNOT_WRITE_PC:
+ warning (_("Instruction wrote to PC in an unexpected way when "
+ "single-stepping"));
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("Invalid argument to displaced_write_reg"));
+ }
+
+ dsc->wrote_to_pc = 1;
+ }
+ else
+ {
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n",
+ regno, (unsigned long) val);
+ regcache_cooked_write_unsigned (regs, regno, val);
+ }
+}
+
+/* This function is used to concisely determine if an instruction INSN
+ references PC. Register fields of interest in INSN should have the
+ corresponding fields of BITMASK set to 0b1111. The function
+ returns return 1 if any of these fields in INSN reference the PC
+ (also 0b1111, r15), else it returns 0. */
+
+static int
+insn_references_pc (uint32_t insn, uint32_t bitmask)
+{
+ uint32_t lowbit = 1;
+
+ while (bitmask != 0)
+ {
+ uint32_t mask;
+
+ for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1)
+ ;
+
+ if (!lowbit)
+ break;
+
+ mask = lowbit * 0xf;
+
+ if ((insn & mask) == mask)
+ return 1;
+
+ bitmask &= ~mask;
+ }
+
+ return 0;
+}
+
+/* The simplest copy function. Many instructions have the same effect no
+ matter what address they are executed at: in those cases, use this. */
+
+static int
+arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn,
+ const char *iname, struct displaced_step_closure *dsc)
+{
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, "
+ "opcode/class '%s' unmodified\n", (unsigned long) insn,
+ iname);
+
+ dsc->modinsn[0] = insn;
+
+ return 0;
+}
+
+static int
+thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, const char *iname,
+ struct displaced_step_closure *dsc)
+{
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, "
+ "opcode/class '%s' unmodified\n", insn1, insn2,
+ iname);
+
+ dsc->modinsn[0] = insn1;
+ dsc->modinsn[1] = insn2;
+ dsc->numinsns = 2;
+
+ return 0;
+}
+
+/* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any
+ modification. */
+static int
+thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, unsigned int insn,
+ const char *iname,
+ struct displaced_step_closure *dsc)
+{
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, "
+ "opcode/class '%s' unmodified\n", insn,
+ iname);
+
+ dsc->modinsn[0] = insn;
+
+ return 0;
+}
+
+/* Preload instructions with immediate offset. */
+
+static void
+cleanup_preload (struct gdbarch *gdbarch,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+ if (!dsc->u.preload.immed)
+ displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
+}
+
+static void
+install_preload (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc, unsigned int rn)
+{
+ ULONGEST rn_val;
+ /* Preload instructions:
+
+ {pli/pld} [rn, #+/-imm]
+ ->
+ {pli/pld} [r0, #+/-imm]. */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
+ dsc->u.preload.immed = 1;
+
+ dsc->cleanup = &cleanup_preload;
+}
+
+static int
+arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn, 16, 19);
+
+ if (!insn_references_pc (insn, 0x000f0000ul))
+ return arm_copy_unmodified (gdbarch, insn, "preload", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n",
+ (unsigned long) insn);
+
+ dsc->modinsn[0] = insn & 0xfff0ffff;
+
+ install_preload (gdbarch, regs, dsc, rn);
+
+ return 0;
+}
+
+static int
+thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn1, 0, 3);
+ unsigned int u_bit = bit (insn1, 7);
+ int imm12 = bits (insn2, 0, 11);
+ ULONGEST pc_val;
+
+ if (rn != ARM_PC_REGNUM)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc);
+
+ /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and
+ PLD (literal) Encoding T1. */
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n",
+ (unsigned int) dsc->insn_addr, u_bit ? '+' : '-',
+ imm12);
+
+ if (!u_bit)
+ imm12 = -1 * imm12;
+
+ /* Rewrite instruction {pli/pld} PC imm12 into:
+ Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12
+
+ {pli/pld} [r0, r1]
+
+ Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+
+ pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM);
+
+ displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC);
+ dsc->u.preload.immed = 0;
+
+ /* {pli/pld} [r0, r1] */
+ dsc->modinsn[0] = insn1 & 0xfff0;
+ dsc->modinsn[1] = 0xf001;
+ dsc->numinsns = 2;
+
+ dsc->cleanup = &cleanup_preload;
+ return 0;
+}
+
+/* Preload instructions with register offset. */
+
+static void
+install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc, unsigned int rn,
+ unsigned int rm)
+{
+ ULONGEST rn_val, rm_val;
+
+ /* Preload register-offset instructions:
+
+ {pli/pld} [rn, rm {, shift}]
+ ->
+ {pli/pld} [r0, r1 {, shift}]. */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ rm_val = displaced_read_reg (regs, dsc, rm);
+ displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC);
+ dsc->u.preload.immed = 0;
+
+ dsc->cleanup = &cleanup_preload;
+}
+
+static int
+arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn, 16, 19);
+ unsigned int rm = bits (insn, 0, 3);
+
+
+ if (!insn_references_pc (insn, 0x000f000ful))
+ return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n",
+ (unsigned long) insn);
+
+ dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1;
+
+ install_preload_reg (gdbarch, regs, dsc, rn, rm);
+ return 0;
+}
+
+/* Copy/cleanup coprocessor load and store instructions. */
+
+static void
+cleanup_copro_load_store (struct gdbarch *gdbarch,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ ULONGEST rn_val = displaced_read_reg (regs, dsc, 0);
+
+ displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+
+ if (dsc->u.ldst.writeback)
+ displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC);
+}
+
+static void
+install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ int writeback, unsigned int rn)
+{
+ ULONGEST rn_val;
+
+ /* Coprocessor load/store instructions:
+
+ {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes)
+ ->
+ {stc/stc2} [r0, #+/-imm].
+
+ ldc/ldc2 are handled identically. */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ /* PC should be 4-byte aligned. */
+ rn_val = rn_val & 0xfffffffc;
+ displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
+
+ dsc->u.ldst.writeback = writeback;
+ dsc->u.ldst.rn = rn;
+
+ dsc->cleanup = &cleanup_copro_load_store;
+}
+
+static int
+arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn, 16, 19);
+
+ if (!insn_references_pc (insn, 0x000f0000ul))
+ return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor "
+ "load/store insn %.8lx\n", (unsigned long) insn);
+
+ dsc->modinsn[0] = insn & 0xfff0ffff;
+
+ install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn);
+
+ return 0;
+}
+
+static int
+thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn1, 0, 3);
+
+ if (rn != ARM_PC_REGNUM)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "copro load/store", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor "
+ "load/store insn %.4x%.4x\n", insn1, insn2);
+
+ dsc->modinsn[0] = insn1 & 0xfff0;
+ dsc->modinsn[1] = insn2;
+ dsc->numinsns = 2;
+
+ /* This function is called for copying instruction LDC/LDC2/VLDR, which
+ doesn't support writeback, so pass 0. */
+ install_copro_load_store (gdbarch, regs, dsc, 0, rn);
+
+ return 0;
+}
+
+/* Clean up branch instructions (actually perform the branch, by setting
+ PC). */
+
+static void
+cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
+ int branch_taken = condition_true (dsc->u.branch.cond, status);
+ enum pc_write_style write_pc = dsc->u.branch.exchange
+ ? BX_WRITE_PC : BRANCH_WRITE_PC;
+
+ if (!branch_taken)
+ return;
+
+ if (dsc->u.branch.link)
+ {
+ /* The value of LR should be the next insn of current one. In order
+ not to confuse logic hanlding later insn `bx lr', if current insn mode
+ is Thumb, the bit 0 of LR value should be set to 1. */
+ ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size;
+
+ if (dsc->is_thumb)
+ next_insn_addr |= 0x1;
+
+ displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr,
+ CANNOT_WRITE_PC);
+ }
+
+ displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc);
+}
+
+/* Copy B/BL/BLX instructions with immediate destinations. */
+
+static void
+install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ unsigned int cond, int exchange, int link, long offset)
+{
+ /* Implement "BL<cond> <label>" as:
+
+ Preparation: cond <- instruction condition
+ Insn: mov r0, r0 (nop)
+ Cleanup: if (condition true) { r14 <- pc; pc <- label }.
+
+ B<cond> similar, but don't set r14 in cleanup. */
+
+ dsc->u.branch.cond = cond;
+ dsc->u.branch.link = link;
+ dsc->u.branch.exchange = exchange;
+
+ dsc->u.branch.dest = dsc->insn_addr;
+ if (link && exchange)
+ /* For BLX, offset is computed from the Align (PC, 4). */
+ dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc;
+
+ if (dsc->is_thumb)
+ dsc->u.branch.dest += 4 + offset;
+ else
+ dsc->u.branch.dest += 8 + offset;
+
+ dsc->cleanup = &cleanup_branch;
+}
+static int
+arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ unsigned int cond = bits (insn, 28, 31);
+ int exchange = (cond == 0xf);
+ int link = exchange || bit (insn, 24);
+ long offset;
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn "
+ "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b",
+ (unsigned long) insn);
+ if (exchange)
+ /* For BLX, set bit 0 of the destination. The cleanup_branch function will
+ then arrange the switch into Thumb mode. */
+ offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1;
+ else
+ offset = bits (insn, 0, 23) << 2;
+
+ if (bit (offset, 25))
+ offset = offset | ~0x3ffffff;
+
+ dsc->modinsn[0] = ARM_NOP;
+
+ install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset);
+ return 0;
+}
+
+static int
+thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int link = bit (insn2, 14);
+ int exchange = link && !bit (insn2, 12);
+ int cond = INST_AL;
+ long offset = 0;
+ int j1 = bit (insn2, 13);
+ int j2 = bit (insn2, 11);
+ int s = sbits (insn1, 10, 10);
+ int i1 = !(j1 ^ bit (insn1, 10));
+ int i2 = !(j2 ^ bit (insn1, 10));
+
+ if (!link && !exchange) /* B */
+ {
+ offset = (bits (insn2, 0, 10) << 1);
+ if (bit (insn2, 12)) /* Encoding T4 */
+ {
+ offset |= (bits (insn1, 0, 9) << 12)
+ | (i2 << 22)
+ | (i1 << 23)
+ | (s << 24);
+ cond = INST_AL;
+ }
+ else /* Encoding T3 */
+ {
+ offset |= (bits (insn1, 0, 5) << 12)
+ | (j1 << 18)
+ | (j2 << 19)
+ | (s << 20);
+ cond = bits (insn1, 6, 9);
+ }
+ }
+ else
+ {
+ offset = (bits (insn1, 0, 9) << 12);
+ offset |= ((i2 << 22) | (i1 << 23) | (s << 24));
+ offset |= exchange ?
+ (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1);
+ }
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn "
+ "%.4x %.4x with offset %.8lx\n",
+ link ? (exchange) ? "blx" : "bl" : "b",
+ insn1, insn2, offset);
+
+ dsc->modinsn[0] = THUMB_NOP;
+
+ install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset);
+ return 0;
+}
+
+/* Copy B Thumb instructions. */
+static int
+thumb_copy_b (struct gdbarch *gdbarch, unsigned short insn,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int cond = 0;
+ int offset = 0;
+ unsigned short bit_12_15 = bits (insn, 12, 15);
+ CORE_ADDR from = dsc->insn_addr;
+
+ if (bit_12_15 == 0xd)
+ {
+ /* offset = SignExtend (imm8:0, 32) */
+ offset = sbits ((insn << 1), 0, 8);
+ cond = bits (insn, 8, 11);
+ }
+ else if (bit_12_15 == 0xe) /* Encoding T2 */
+ {
+ offset = sbits ((insn << 1), 0, 11);
+ cond = INST_AL;
+ }
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying b immediate insn %.4x "
+ "with offset %d\n", insn, offset);
+
+ dsc->u.branch.cond = cond;
+ dsc->u.branch.link = 0;
+ dsc->u.branch.exchange = 0;
+ dsc->u.branch.dest = from + 4 + offset;
+
+ dsc->modinsn[0] = THUMB_NOP;
+
+ dsc->cleanup = &cleanup_branch;
+
+ return 0;
+}
+
+/* Copy BX/BLX with register-specified destinations. */
+
+static void
+install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc, int link,
+ unsigned int cond, unsigned int rm)
+{
+ /* Implement {BX,BLX}<cond> <reg>" as:
+
+ Preparation: cond <- instruction condition
+ Insn: mov r0, r0 (nop)
+ Cleanup: if (condition true) { r14 <- pc; pc <- dest; }.
+
+ Don't set r14 in cleanup for BX. */
+
+ dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm);
+
+ dsc->u.branch.cond = cond;
+ dsc->u.branch.link = link;
+
+ dsc->u.branch.exchange = 1;
+
+ dsc->cleanup = &cleanup_branch;
+}
+
+static int
+arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ unsigned int cond = bits (insn, 28, 31);
+ /* BX: x12xxx1x
+ BLX: x12xxx3x. */
+ int link = bit (insn, 5);
+ unsigned int rm = bits (insn, 0, 3);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx",
+ (unsigned long) insn);
+
+ dsc->modinsn[0] = ARM_NOP;
+
+ install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm);
+ return 0;
+}
+
+static int
+thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int link = bit (insn, 7);
+ unsigned int rm = bits (insn, 3, 6);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x",
+ (unsigned short) insn);
+
+ dsc->modinsn[0] = THUMB_NOP;
+
+ install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm);
+
+ return 0;
+}
+
+
+/* Copy/cleanup arithmetic/logic instruction with immediate RHS. */
+
+static void
+cleanup_alu_imm (struct gdbarch *gdbarch,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ ULONGEST rd_val = displaced_read_reg (regs, dsc, 0);
+ displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+}
+
+static int
+arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rn = bits (insn, 16, 19);
+ unsigned int rd = bits (insn, 12, 15);
+ unsigned int op = bits (insn, 21, 24);
+ int is_mov = (op == 0xd);
+ ULONGEST rd_val, rn_val;
+
+ if (!insn_references_pc (insn, 0x000ff000ul))
+ return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn "
+ "%.8lx\n", is_mov ? "move" : "ALU",
+ (unsigned long) insn);
+
+ /* Instruction is of form:
+
+ <op><cond> rd, [rn,] #imm
+
+ Rewrite as:
+
+ Preparation: tmp1, tmp2 <- r0, r1;
+ r0, r1 <- rd, rn
+ Insn: <op><cond> r0, r1, #imm
+ Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
+ */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ rd_val = displaced_read_reg (regs, dsc, rd);
+ displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
+ dsc->rd = rd;
+
+ if (is_mov)
+ dsc->modinsn[0] = insn & 0xfff00fff;
+ else
+ dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000;
+
+ dsc->cleanup = &cleanup_alu_imm;
+
+ return 0;
+}
+
+static int
+thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int op = bits (insn1, 5, 8);
+ unsigned int rn, rm, rd;
+ ULONGEST rd_val, rn_val;
+
+ rn = bits (insn1, 0, 3); /* Rn */
+ rm = bits (insn2, 0, 3); /* Rm */
+ rd = bits (insn2, 8, 11); /* Rd */
+
+ /* This routine is only called for instruction MOV. */
+ gdb_assert (op == 0x2 && rn == 0xf);
+
+ if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n",
+ "ALU", insn1, insn2);
+
+ /* Instruction is of form:
+
+ <op><cond> rd, [rn,] #imm
+
+ Rewrite as:
+
+ Preparation: tmp1, tmp2 <- r0, r1;
+ r0, r1 <- rd, rn
+ Insn: <op><cond> r0, r1, #imm
+ Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
+ */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ rd_val = displaced_read_reg (regs, dsc, rd);
+ displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
+ dsc->rd = rd;
+
+ dsc->modinsn[0] = insn1;
+ dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1);
+ dsc->numinsns = 2;
+
+ dsc->cleanup = &cleanup_alu_imm;
+
+ return 0;
+}
+
+/* Copy/cleanup arithmetic/logic insns with register RHS. */
+
+static void
+cleanup_alu_reg (struct gdbarch *gdbarch,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ ULONGEST rd_val;
+ int i;
+
+ rd_val = displaced_read_reg (regs, dsc, 0);
+
+ for (i = 0; i < 3; i++)
+ displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC);
+
+ displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+}
+
+static void
+install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ unsigned int rd, unsigned int rn, unsigned int rm)
+{
+ ULONGEST rd_val, rn_val, rm_val;
+
+ /* Instruction is of form:
+
+ <op><cond> rd, [rn,] rm [, <shift>]
+
+ Rewrite as:
+
+ Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2;
+ r0, r1, r2 <- rd, rn, rm
+ Insn: <op><cond> r0, r1, r2 [, <shift>]
+ Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3
+ */
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+ dsc->tmp[2] = displaced_read_reg (regs, dsc, 2);
+ rd_val = displaced_read_reg (regs, dsc, rd);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ rm_val = displaced_read_reg (regs, dsc, rm);
+ displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC);
+ dsc->rd = rd;
+
+ dsc->cleanup = &cleanup_alu_reg;
+}
+
+static int
+arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int op = bits (insn, 21, 24);
+ int is_mov = (op == 0xd);
+
+ if (!insn_references_pc (insn, 0x000ff00ful))
+ return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n",
+ is_mov ? "move" : "ALU", (unsigned long) insn);
+
+ if (is_mov)
+ dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2;
+ else
+ dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002;
+
+ install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19),
+ bits (insn, 0, 3));
+ return 0;
+}
+
+static int
+thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned rn, rm, rd;
+
+ rd = bits (insn, 3, 6);
+ rn = (bit (insn, 7) << 3) | bits (insn, 0, 2);
+ rm = 2;
+
+ if (rd != ARM_PC_REGNUM && rn != ARM_PC_REGNUM)
+ return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x\n",
+ "ALU", (unsigned short) insn);
+
+ dsc->modinsn[0] = ((insn & 0xff00) | 0x08);
+
+ install_alu_reg (gdbarch, regs, dsc, rd, rn, rm);
+
+ return 0;
+}
+
+/* Cleanup/copy arithmetic/logic insns with shifted register RHS. */
+
+static void
+cleanup_alu_shifted_reg (struct gdbarch *gdbarch,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ ULONGEST rd_val = displaced_read_reg (regs, dsc, 0);
+ int i;
+
+ for (i = 0; i < 4; i++)
+ displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC);
+
+ displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+}
+
+static void
+install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ unsigned int rd, unsigned int rn, unsigned int rm,
+ unsigned rs)
+{
+ int i;
+ ULONGEST rd_val, rn_val, rm_val, rs_val;
+
+ /* Instruction is of form:
+
+ <op><cond> rd, [rn,] rm, <shift> rs
+
+ Rewrite as:
+
+ Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3
+ r0, r1, r2, r3 <- rd, rn, rm, rs
+ Insn: <op><cond> r0, r1, r2, <shift> r3
+ Cleanup: tmp5 <- r0
+ r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4
+ rd <- tmp5
+ */
+
+ for (i = 0; i < 4; i++)
+ dsc->tmp[i] = displaced_read_reg (regs, dsc, i);
+
+ rd_val = displaced_read_reg (regs, dsc, rd);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ rm_val = displaced_read_reg (regs, dsc, rm);
+ rs_val = displaced_read_reg (regs, dsc, rs);
+ displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC);
+ dsc->rd = rd;
+ dsc->cleanup = &cleanup_alu_shifted_reg;
+}
+
+static int
+arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int op = bits (insn, 21, 24);
+ int is_mov = (op == 0xd);
+ unsigned int rd, rn, rm, rs;
+
+ if (!insn_references_pc (insn, 0x000fff0ful))
+ return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn "
+ "%.8lx\n", is_mov ? "move" : "ALU",
+ (unsigned long) insn);
+
+ rn = bits (insn, 16, 19);
+ rm = bits (insn, 0, 3);
+ rs = bits (insn, 8, 11);
+ rd = bits (insn, 12, 15);
+
+ if (is_mov)
+ dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302;
+ else
+ dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302;
+
+ install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs);
+
+ return 0;
+}
+
+/* Clean up load instructions. */
+
+static void
+cleanup_load (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ ULONGEST rt_val, rt_val2 = 0, rn_val;
+
+ rt_val = displaced_read_reg (regs, dsc, 0);
+ if (dsc->u.ldst.xfersize == 8)
+ rt_val2 = displaced_read_reg (regs, dsc, 1);
+ rn_val = displaced_read_reg (regs, dsc, 2);
+
+ displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+ if (dsc->u.ldst.xfersize > 4)
+ displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC);
+ if (!dsc->u.ldst.immed)
+ displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC);
+
+ /* Handle register writeback. */
+ if (dsc->u.ldst.writeback)
+ displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC);
+ /* Put result in right place. */
+ displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC);
+ if (dsc->u.ldst.xfersize == 8)
+ displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC);
+}
+
+/* Clean up store instructions. */
+
+static void
+cleanup_store (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ ULONGEST rn_val = displaced_read_reg (regs, dsc, 2);
+
+ displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+ if (dsc->u.ldst.xfersize > 4)
+ displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC);
+ if (!dsc->u.ldst.immed)
+ displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC);
+ if (!dsc->u.ldst.restore_r4)
+ displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC);
+
+ /* Writeback. */
+ if (dsc->u.ldst.writeback)
+ displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC);
+}
+
+/* Copy "extra" load/store instructions. These are halfword/doubleword
+ transfers, which have a different encoding to byte/word transfers. */
+
+static int
+arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
+ unsigned int op1 = bits (insn, 20, 24);
+ unsigned int op2 = bits (insn, 5, 6);
+ unsigned int rt = bits (insn, 12, 15);
+ unsigned int rn = bits (insn, 16, 19);
+ unsigned int rm = bits (insn, 0, 3);
+ char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1};
+ char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2};
+ int immed = (op1 & 0x4) != 0;
+ int opcode;
+ ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0;
+
+ if (!insn_references_pc (insn, 0x000ff00ful))
+ return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store "
+ "insn %.8lx\n", unpriveleged ? "unpriveleged " : "",
+ (unsigned long) insn);
+
+ opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4;
+
+ if (opcode < 0)
+ internal_error (__FILE__, __LINE__,
+ _("copy_extra_ld_st: instruction decode error"));
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[1] = displaced_read_reg (regs, dsc, 1);
+ dsc->tmp[2] = displaced_read_reg (regs, dsc, 2);
+ if (!immed)
+ dsc->tmp[3] = displaced_read_reg (regs, dsc, 3);
+
+ rt_val = displaced_read_reg (regs, dsc, rt);
+ if (bytesize[opcode] == 8)
+ rt_val2 = displaced_read_reg (regs, dsc, rt + 1);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ if (!immed)
+ rm_val = displaced_read_reg (regs, dsc, rm);
+
+ displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC);
+ if (bytesize[opcode] == 8)
+ displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC);
+ if (!immed)
+ displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC);
+
+ dsc->rd = rt;
+ dsc->u.ldst.xfersize = bytesize[opcode];
+ dsc->u.ldst.rn = rn;
+ dsc->u.ldst.immed = immed;
+ dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0;
+ dsc->u.ldst.restore_r4 = 0;
+
+ if (immed)
+ /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm]
+ ->
+ {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */
+ dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000;
+ else
+ /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm]
+ ->
+ {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */
+ dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003;
+
+ dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store;
+
+ return 0;
+}
+
+/* Copy byte/half word/word loads and stores. */
+
+static void
+install_load_store (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc, int load,
+ int immed, int writeback, int size, int usermode,
+ int rt, int rm, int rn)
+{
+ ULONGEST rt_val, rn_val, rm_val = 0;
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[2] = displaced_read_reg (regs, dsc, 2);
+ if (!immed)
+ dsc->tmp[3] = displaced_read_reg (regs, dsc, 3);
+ if (!load)
+ dsc->tmp[4] = displaced_read_reg (regs, dsc, 4);
+
+ rt_val = displaced_read_reg (regs, dsc, rt);
+ rn_val = displaced_read_reg (regs, dsc, rn);
+ if (!immed)
+ rm_val = displaced_read_reg (regs, dsc, rm);
+
+ displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC);
+ if (!immed)
+ displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC);
+ dsc->rd = rt;
+ dsc->u.ldst.xfersize = size;
+ dsc->u.ldst.rn = rn;
+ dsc->u.ldst.immed = immed;
+ dsc->u.ldst.writeback = writeback;
+
+ /* To write PC we can do:
+
+ Before this sequence of instructions:
+ r0 is the PC value got from displaced_read_reg, so r0 = from + 8;
+ r2 is the Rn value got from dispalced_read_reg.
+
+ Insn1: push {pc} Write address of STR instruction + offset on stack
+ Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset
+ Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc
+ = addr(Insn1) + offset - addr(Insn3) - 8
+ = offset - 16
+ Insn4: add r4, r4, #8 r4 = offset - 8
+ Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8
+ = from + offset
+ Insn6: str r0, [r2, #imm] (or str r0, [r2, r3])
+
+ Otherwise we don't know what value to write for PC, since the offset is
+ architecture-dependent (sometimes PC+8, sometimes PC+12). More details
+ of this can be found in Section "Saving from r15" in
+ http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */
+
+ dsc->cleanup = load ? &cleanup_load : &cleanup_store;
+}
+
+
+static int
+thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc, int size)
+{
+ unsigned int u_bit = bit (insn1, 7);
+ unsigned int rt = bits (insn2, 12, 15);
+ int imm12 = bits (insn2, 0, 11);
+ ULONGEST pc_val;
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n",
+ (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-',
+ imm12);
+
+ if (!u_bit)
+ imm12 = -1 * imm12;
+
+ /* Rewrite instruction LDR Rt imm12 into:
+
+ Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12
+
+ LDR R0, R2, R3,
+
+ Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */
+
+
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[2] = displaced_read_reg (regs, dsc, 2);
+ dsc->tmp[3] = displaced_read_reg (regs, dsc, 3);
+
+ pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM);
+
+ pc_val = pc_val & 0xfffffffc;
+
+ displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC);
+
+ dsc->rd = rt;
+
+ dsc->u.ldst.xfersize = size;
+ dsc->u.ldst.immed = 0;
+ dsc->u.ldst.writeback = 0;
+ dsc->u.ldst.restore_r4 = 0;
+
+ /* LDR R0, R2, R3 */
+ dsc->modinsn[0] = 0xf852;
+ dsc->modinsn[1] = 0x3;
+ dsc->numinsns = 2;
+
+ dsc->cleanup = &cleanup_load;
+
+ return 0;
+}
+
+static int
+thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ int writeback, int immed)
+{
+ unsigned int rt = bits (insn2, 12, 15);
+ unsigned int rn = bits (insn1, 0, 3);
+ unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */
+ /* In LDR (register), there is also a register Rm, which is not allowed to
+ be PC, so we don't have to check it. */
+
+ if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load",
+ dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n",
+ rt, rn, insn1, insn2);
+
+ install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4,
+ 0, rt, rm, rn);
+
+ dsc->u.ldst.restore_r4 = 0;
+
+ if (immed)
+ /* ldr[b]<cond> rt, [rn, #imm], etc.
+ ->
+ ldr[b]<cond> r0, [r2, #imm]. */
+ {
+ dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2;
+ dsc->modinsn[1] = insn2 & 0x0fff;
+ }
+ else
+ /* ldr[b]<cond> rt, [rn, rm], etc.
+ ->
+ ldr[b]<cond> r0, [r2, r3]. */
+ {
+ dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2;
+ dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3;
+ }
+
+ dsc->numinsns = 2;
+
+ return 0;
+}
+
+
+static int
+arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ int load, int size, int usermode)
+{
+ int immed = !bit (insn, 25);
+ int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0);
+ unsigned int rt = bits (insn, 12, 15);
+ unsigned int rn = bits (insn, 16, 19);
+ unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */
+
+ if (!insn_references_pc (insn, 0x000ff00ful))
+ return arm_copy_unmodified (gdbarch, insn, "load/store", dsc);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying %s%s r%d [r%d] insn %.8lx\n",
+ load ? (size == 1 ? "ldrb" : "ldr")
+ : (size == 1 ? "strb" : "str"), usermode ? "t" : "",
+ rt, rn,
+ (unsigned long) insn);
+
+ install_load_store (gdbarch, regs, dsc, load, immed, writeback, size,
+ usermode, rt, rm, rn);
+
+ if (load || rt != ARM_PC_REGNUM)
+ {
+ dsc->u.ldst.restore_r4 = 0;
+
+ if (immed)
+ /* {ldr,str}[b]<cond> rt, [rn, #imm], etc.
+ ->
+ {ldr,str}[b]<cond> r0, [r2, #imm]. */
+ dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000;
+ else
+ /* {ldr,str}[b]<cond> rt, [rn, rm], etc.
+ ->
+ {ldr,str}[b]<cond> r0, [r2, r3]. */
+ dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003;
+ }
+ else
+ {
+ /* We need to use r4 as scratch. Make sure it's restored afterwards. */
+ dsc->u.ldst.restore_r4 = 1;
+ dsc->modinsn[0] = 0xe92d8000; /* push {pc} */
+ dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */
+ dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */
+ dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */
+ dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */
+
+ /* As above. */
+ if (immed)
+ dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000;
+ else
+ dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003;
+
+ dsc->numinsns = 6;
+ }
+
+ dsc->cleanup = load ? &cleanup_load : &cleanup_store;
+
+ return 0;
+}
+
+/* Cleanup LDM instructions with fully-populated register list. This is an
+ unfortunate corner case: it's impossible to implement correctly by modifying
+ the instruction. The issue is as follows: we have an instruction,
+
+ ldm rN, {r0-r15}
+
+ which we must rewrite to avoid loading PC. A possible solution would be to
+ do the load in two halves, something like (with suitable cleanup
+ afterwards):
+
+ mov r8, rN
+ ldm[id][ab] r8!, {r0-r7}
+ str r7, <temp>
+ ldm[id][ab] r8, {r7-r14}
+ <bkpt>
+
+ but at present there's no suitable place for <temp>, since the scratch space
+ is overwritten before the cleanup routine is called. For now, we simply
+ emulate the instruction. */
+
+static void
+cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int inc = dsc->u.block.increment;
+ int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0;
+ int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4);
+ uint32_t regmask = dsc->u.block.regmask;
+ int regno = inc ? 0 : 15;
+ CORE_ADDR xfer_addr = dsc->u.block.xfer_addr;
+ int exception_return = dsc->u.block.load && dsc->u.block.user
+ && (regmask & 0x8000) != 0;
+ uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
+ int do_transfer = condition_true (dsc->u.block.cond, status);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ if (!do_transfer)
+ return;
+
+ /* If the instruction is ldm rN, {...pc}^, I don't think there's anything
+ sensible we can do here. Complain loudly. */
+ if (exception_return)
+ error (_("Cannot single-step exception return"));
+
+ /* We don't handle any stores here for now. */
+ gdb_assert (dsc->u.block.load != 0);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: "
+ "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm",
+ dsc->u.block.increment ? "inc" : "dec",
+ dsc->u.block.before ? "before" : "after");
+
+ while (regmask)
+ {
+ uint32_t memword;
+
+ if (inc)
+ while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0)
+ regno++;
+ else
+ while (regno >= 0 && (regmask & (1 << regno)) == 0)
+ regno--;
+
+ xfer_addr += bump_before;
+
+ memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order);
+ displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC);
+
+ xfer_addr += bump_after;
+
+ regmask &= ~(1 << regno);
+ }
+
+ if (dsc->u.block.writeback)
+ displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr,
+ CANNOT_WRITE_PC);
+}
+
+/* Clean up an STM which included the PC in the register list. */
+
+static void
+cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
+ int store_executed = condition_true (dsc->u.block.cond, status);
+ CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask);
+ CORE_ADDR stm_insn_addr;
+ uint32_t pc_val;
+ long offset;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ /* If condition code fails, there's nothing else to do. */
+ if (!store_executed)
+ return;
+
+ if (dsc->u.block.increment)
+ {
+ pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs;
- imm1 = sbits (inst1, 0, 10);
- imm2 = bits (inst2, 0, 10);
- j1 = bit (inst2, 13);
- j2 = bit (inst2, 11);
+ if (dsc->u.block.before)
+ pc_stored_at += 4;
+ }
+ else
+ {
+ pc_stored_at = dsc->u.block.xfer_addr;
- offset = ((imm1 << 12) + (imm2 << 1));
- offset ^= ((!j2) << 22) | ((!j1) << 23);
+ if (dsc->u.block.before)
+ pc_stored_at -= 4;
+ }
- nextpc = pc_val + offset;
- /* For BLX make sure to clear the low bits. */
- if (bit (inst2, 12) == 0)
- nextpc = nextpc & 0xfffffffc;
- }
- else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00)
- {
- /* SUBS PC, LR, #imm8. */
- nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM);
- nextpc -= inst2 & 0x00ff;
- }
- else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380)
- {
- /* Conditional branch. */
- if (condition_true (bits (inst1, 6, 9), status))
- {
- int sign, j1, j2, imm1, imm2;
+ pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order);
+ stm_insn_addr = dsc->scratch_base;
+ offset = pc_val - stm_insn_addr;
- sign = sbits (inst1, 10, 10);
- imm1 = bits (inst1, 0, 5);
- imm2 = bits (inst2, 0, 10);
- j1 = bit (inst2, 13);
- j2 = bit (inst2, 11);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for "
+ "STM instruction\n", offset);
- offset = (sign << 20) + (j2 << 19) + (j1 << 18);
- offset += (imm1 << 12) + (imm2 << 1);
+ /* Rewrite the stored PC to the proper value for the non-displaced original
+ instruction. */
+ write_memory_unsigned_integer (pc_stored_at, 4, byte_order,
+ dsc->insn_addr + offset);
+}
- nextpc = pc_val + offset;
- }
- }
- }
- else if ((inst1 & 0xfe50) == 0xe810)
- {
- /* Load multiple or RFE. */
- int rn, offset, load_pc = 1;
+/* Clean up an LDM which includes the PC in the register list. We clumped all
+ the registers in the transferred list into a contiguous range r0...rX (to
+ avoid loading PC directly and losing control of the debugged program), so we
+ must undo that here. */
- rn = bits (inst1, 0, 3);
- if (bit (inst1, 7) && !bit (inst1, 8))
- {
- /* LDMIA or POP */
- if (!bit (inst2, 15))
- load_pc = 0;
- offset = bitcount (inst2) * 4 - 4;
- }
- else if (!bit (inst1, 7) && bit (inst1, 8))
- {
- /* LDMDB */
- if (!bit (inst2, 15))
- load_pc = 0;
- offset = -4;
- }
- else if (bit (inst1, 7) && bit (inst1, 8))
- {
- /* RFEIA */
- offset = 0;
- }
- else if (!bit (inst1, 7) && !bit (inst1, 8))
- {
- /* RFEDB */
- offset = -8;
- }
- else
- load_pc = 0;
+static void
+cleanup_block_load_pc (struct gdbarch *gdbarch,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
+ int load_executed = condition_true (dsc->u.block.cond, status);
+ unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM;
+ unsigned int regs_loaded = bitcount (mask);
+ unsigned int num_to_shuffle = regs_loaded, clobbered;
- if (load_pc)
- {
- CORE_ADDR addr = get_frame_register_unsigned (frame, rn);
- nextpc = get_frame_memory_unsigned (frame, addr + offset, 4);
- }
- }
- else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00)
- {
- /* MOV PC or MOVS PC. */
- nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3));
- nextpc = MAKE_THUMB_ADDR (nextpc);
- }
- else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000)
+ /* The method employed here will fail if the register list is fully populated
+ (we need to avoid loading PC directly). */
+ gdb_assert (num_to_shuffle < 16);
+
+ if (!load_executed)
+ return;
+
+ clobbered = (1 << num_to_shuffle) - 1;
+
+ while (num_to_shuffle > 0)
+ {
+ if ((mask & (1 << write_reg)) != 0)
{
- /* LDR PC. */
- CORE_ADDR base;
- int rn, load_pc = 1;
+ unsigned int read_reg = num_to_shuffle - 1;
- rn = bits (inst1, 0, 3);
- base = get_frame_register_unsigned (frame, rn);
- if (rn == 15)
- {
- base = (base + 4) & ~(CORE_ADDR) 0x3;
- if (bit (inst1, 7))
- base += bits (inst2, 0, 11);
- else
- base -= bits (inst2, 0, 11);
- }
- else if (bit (inst1, 7))
- base += bits (inst2, 0, 11);
- else if (bit (inst2, 11))
- {
- if (bit (inst2, 10))
- {
- if (bit (inst2, 9))
- base += bits (inst2, 0, 7);
- else
- base -= bits (inst2, 0, 7);
- }
- }
- else if ((inst2 & 0x0fc0) == 0x0000)
+ if (read_reg != write_reg)
{
- int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3);
- base += get_frame_register_unsigned (frame, rm) << shift;
+ ULONGEST rval = displaced_read_reg (regs, dsc, read_reg);
+ displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move "
+ "loaded register r%d to r%d\n"), read_reg,
+ write_reg);
}
- else
- /* Reserved. */
- load_pc = 0;
-
- if (load_pc)
- nextpc = get_frame_memory_unsigned (frame, base, 4);
- }
- else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000)
- {
- /* TBB. */
- CORE_ADDR tbl_reg, table, offset, length;
+ else if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register "
+ "r%d already in the right place\n"),
+ write_reg);
- tbl_reg = bits (inst1, 0, 3);
- if (tbl_reg == 0x0f)
- table = pc + 4; /* Regcache copy of PC isn't right yet. */
- else
- table = get_frame_register_unsigned (frame, tbl_reg);
+ clobbered &= ~(1 << write_reg);
- offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3));
- length = 2 * get_frame_memory_unsigned (frame, table + offset, 1);
- nextpc = pc_val + length;
+ num_to_shuffle--;
}
- else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010)
- {
- /* TBH. */
- CORE_ADDR tbl_reg, table, offset, length;
-
- tbl_reg = bits (inst1, 0, 3);
- if (tbl_reg == 0x0f)
- table = pc + 4; /* Regcache copy of PC isn't right yet. */
- else
- table = get_frame_register_unsigned (frame, tbl_reg);
- offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3));
- length = 2 * get_frame_memory_unsigned (frame, table + offset, 2);
- nextpc = pc_val + length;
- }
+ write_reg--;
}
- else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */
+
+ /* Restore any registers we scribbled over. */
+ for (write_reg = 0; clobbered != 0; write_reg++)
{
- if (bits (inst1, 3, 6) == 0x0f)
- nextpc = pc_val;
- else
- nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6));
+ if ((clobbered & (1 << write_reg)) != 0)
+ {
+ displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg],
+ CANNOT_WRITE_PC);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored "
+ "clobbered register r%d\n"), write_reg);
+ clobbered &= ~(1 << write_reg);
+ }
}
- else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */
- {
- if (bits (inst1, 3, 6) == 0x0f)
- nextpc = pc_val;
- else
- nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6));
- nextpc = MAKE_THUMB_ADDR (nextpc);
- }
- else if ((inst1 & 0xf500) == 0xb100)
+ /* Perform register writeback manually. */
+ if (dsc->u.block.writeback)
{
- /* CBNZ or CBZ. */
- int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1);
- ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2));
+ ULONGEST new_rn_val = dsc->u.block.xfer_addr;
- if (bit (inst1, 11) && reg != 0)
- nextpc = pc_val + imm;
- else if (!bit (inst1, 11) && reg == 0)
- nextpc = pc_val + imm;
+ if (dsc->u.block.increment)
+ new_rn_val += regs_loaded * 4;
+ else
+ new_rn_val -= regs_loaded * 4;
+
+ displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val,
+ CANNOT_WRITE_PC);
}
- return nextpc;
}
-/* Get the raw next address. PC is the current program counter, in
- FRAME. INSERT_BKPT should be TRUE if we want a breakpoint set on
- the alternative next instruction if there are two options.
-
- The value returned has the execution state of the next instruction
- encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is
- in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory
- address.
-*/
-static CORE_ADDR
-arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc, int insert_bkpt)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- unsigned long pc_val;
- unsigned long this_instr;
- unsigned long status;
- CORE_ADDR nextpc;
-
- if (arm_frame_is_thumb (frame))
- return thumb_get_next_pc_raw (frame, pc, insert_bkpt);
+/* Handle ldm/stm, apart from some tricky cases which are unlikely to occur
+ in user-level code (in particular exception return, ldm rn, {...pc}^). */
- pc_val = (unsigned long) pc;
- this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code);
+static int
+arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int load = bit (insn, 20);
+ int user = bit (insn, 22);
+ int increment = bit (insn, 23);
+ int before = bit (insn, 24);
+ int writeback = bit (insn, 21);
+ int rn = bits (insn, 16, 19);
- status = get_frame_register_unsigned (frame, ARM_PS_REGNUM);
- nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */
+ /* Block transfers which don't mention PC can be run directly
+ out-of-line. */
+ if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0)
+ return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc);
- if (bits (this_instr, 28, 31) == INST_NV)
- switch (bits (this_instr, 24, 27))
- {
- case 0xa:
- case 0xb:
- {
- /* Branch with Link and change to Thumb. */
- nextpc = BranchDest (pc, this_instr);
- nextpc |= bit (this_instr, 24) << 1;
- nextpc = MAKE_THUMB_ADDR (nextpc);
- break;
- }
- case 0xc:
- case 0xd:
- case 0xe:
- /* Coprocessor register transfer. */
- if (bits (this_instr, 12, 15) == 15)
- error (_("Invalid update to pc in instruction"));
- break;
- }
- else if (condition_true (bits (this_instr, 28, 31), status))
+ if (rn == ARM_PC_REGNUM)
{
- switch (bits (this_instr, 24, 27))
- {
- case 0x0:
- case 0x1: /* data processing */
- case 0x2:
- case 0x3:
- {
- unsigned long operand1, operand2, result = 0;
- unsigned long rn;
- int c;
+ warning (_("displaced: Unpredictable LDM or STM with "
+ "base register r15"));
+ return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc);
+ }
- if (bits (this_instr, 12, 15) != 15)
- break;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn "
+ "%.8lx\n", (unsigned long) insn);
- if (bits (this_instr, 22, 25) == 0
- && bits (this_instr, 4, 7) == 9) /* multiply */
- error (_("Invalid update to pc in instruction"));
+ dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn);
+ dsc->u.block.rn = rn;
- /* BX <reg>, BLX <reg> */
- if (bits (this_instr, 4, 27) == 0x12fff1
- || bits (this_instr, 4, 27) == 0x12fff3)
- {
- rn = bits (this_instr, 0, 3);
- nextpc = (rn == 15) ? pc_val + 8
- : get_frame_register_unsigned (frame, rn);
- return nextpc;
- }
+ dsc->u.block.load = load;
+ dsc->u.block.user = user;
+ dsc->u.block.increment = increment;
+ dsc->u.block.before = before;
+ dsc->u.block.writeback = writeback;
+ dsc->u.block.cond = bits (insn, 28, 31);
- /* Multiply into PC */
- c = (status & FLAG_C) ? 1 : 0;
- rn = bits (this_instr, 16, 19);
- operand1 = (rn == 15) ? pc_val + 8
- : get_frame_register_unsigned (frame, rn);
+ dsc->u.block.regmask = insn & 0xffff;
- if (bit (this_instr, 25))
- {
- unsigned long immval = bits (this_instr, 0, 7);
- unsigned long rotate = 2 * bits (this_instr, 8, 11);
- operand2 = ((immval >> rotate) | (immval << (32 - rotate)))
- & 0xffffffff;
- }
- else /* operand 2 is a shifted register */
- operand2 = shifted_reg_val (frame, this_instr, c, pc_val, status);
+ if (load)
+ {
+ if ((insn & 0xffff) == 0xffff)
+ {
+ /* LDM with a fully-populated register list. This case is
+ particularly tricky. Implement for now by fully emulating the
+ instruction (which might not behave perfectly in all cases, but
+ these instructions should be rare enough for that not to matter
+ too much). */
+ dsc->modinsn[0] = ARM_NOP;
- switch (bits (this_instr, 21, 24))
- {
- case 0x0: /*and */
- result = operand1 & operand2;
- break;
+ dsc->cleanup = &cleanup_block_load_all;
+ }
+ else
+ {
+ /* LDM of a list of registers which includes PC. Implement by
+ rewriting the list of registers to be transferred into a
+ contiguous chunk r0...rX before doing the transfer, then shuffling
+ registers into the correct places in the cleanup routine. */
+ unsigned int regmask = insn & 0xffff;
+ unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1;
+ unsigned int to = 0, from = 0, i, new_rn;
- case 0x1: /*eor */
- result = operand1 ^ operand2;
- break;
+ for (i = 0; i < num_in_list; i++)
+ dsc->tmp[i] = displaced_read_reg (regs, dsc, i);
- case 0x2: /*sub */
- result = operand1 - operand2;
- break;
+ /* Writeback makes things complicated. We need to avoid clobbering
+ the base register with one of the registers in our modified
+ register list, but just using a different register can't work in
+ all cases, e.g.:
- case 0x3: /*rsb */
- result = operand2 - operand1;
- break;
+ ldm r14!, {r0-r13,pc}
- case 0x4: /*add */
- result = operand1 + operand2;
- break;
+ which would need to be rewritten as:
- case 0x5: /*adc */
- result = operand1 + operand2 + c;
- break;
+ ldm rN!, {r0-r14}
- case 0x6: /*sbc */
- result = operand1 - operand2 + c;
- break;
+ but that can't work, because there's no free register for N.
- case 0x7: /*rsc */
- result = operand2 - operand1 + c;
- break;
+ Solve this by turning off the writeback bit, and emulating
+ writeback manually in the cleanup routine. */
- case 0x8:
- case 0x9:
- case 0xa:
- case 0xb: /* tst, teq, cmp, cmn */
- result = (unsigned long) nextpc;
- break;
+ if (writeback)
+ insn &= ~(1 << 21);
- case 0xc: /*orr */
- result = operand1 | operand2;
- break;
+ new_regmask = (1 << num_in_list) - 1;
- case 0xd: /*mov */
- /* Always step into a function. */
- result = operand2;
- break;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, "
+ "{..., pc}: original reg list %.4x, modified "
+ "list %.4x\n"), rn, writeback ? "!" : "",
+ (int) insn & 0xffff, new_regmask);
- case 0xe: /*bic */
- result = operand1 & ~operand2;
- break;
+ dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff);
- case 0xf: /*mvn */
- result = ~operand2;
- break;
- }
+ dsc->cleanup = &cleanup_block_load_pc;
+ }
+ }
+ else
+ {
+ /* STM of a list of registers which includes PC. Run the instruction
+ as-is, but out of line: this will store the wrong value for the PC,
+ so we must manually fix up the memory in the cleanup routine.
+ Doing things this way has the advantage that we can auto-detect
+ the offset of the PC write (which is architecture-dependent) in
+ the cleanup routine. */
+ dsc->modinsn[0] = insn;
- /* In 26-bit APCS the bottom two bits of the result are
- ignored, and we always end up in ARM state. */
- if (!arm_apcs_32)
- nextpc = arm_addr_bits_remove (gdbarch, result);
- else
- nextpc = result;
+ dsc->cleanup = &cleanup_block_store_pc;
+ }
- break;
- }
+ return 0;
+}
- case 0x4:
- case 0x5: /* data transfer */
- case 0x6:
- case 0x7:
- if (bit (this_instr, 20))
- {
- /* load */
- if (bits (this_instr, 12, 15) == 15)
- {
- /* rd == pc */
- unsigned long rn;
- unsigned long base;
+static int
+thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int rn = bits (insn1, 0, 3);
+ int load = bit (insn1, 4);
+ int writeback = bit (insn1, 5);
- if (bit (this_instr, 22))
- error (_("Invalid update to pc in instruction"));
+ /* Block transfers which don't mention PC can be run directly
+ out-of-line. */
+ if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc);
- /* byte write to PC */
- rn = bits (this_instr, 16, 19);
- base = (rn == 15) ? pc_val + 8
- : get_frame_register_unsigned (frame, rn);
- if (bit (this_instr, 24))
- {
- /* pre-indexed */
- int c = (status & FLAG_C) ? 1 : 0;
- unsigned long offset =
- (bit (this_instr, 25)
- ? shifted_reg_val (frame, this_instr, c, pc_val, status)
- : bits (this_instr, 0, 11));
+ if (rn == ARM_PC_REGNUM)
+ {
+ warning (_("displaced: Unpredictable LDM or STM with "
+ "base register r15"));
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "unpredictable ldm/stm", dsc);
+ }
- if (bit (this_instr, 23))
- base += offset;
- else
- base -= offset;
- }
- nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base,
- 4, byte_order);
- }
- }
- break;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn "
+ "%.4x%.4x\n", insn1, insn2);
- case 0x8:
- case 0x9: /* block transfer */
- if (bit (this_instr, 20))
- {
- /* LDM */
- if (bit (this_instr, 15))
- {
- /* loading pc */
- int offset = 0;
+ /* Clear bit 13, since it should be always zero. */
+ dsc->u.block.regmask = (insn2 & 0xdfff);
+ dsc->u.block.rn = rn;
- if (bit (this_instr, 23))
- {
- /* up */
- unsigned long reglist = bits (this_instr, 0, 14);
- offset = bitcount (reglist) * 4;
- if (bit (this_instr, 24)) /* pre */
- offset += 4;
- }
- else if (bit (this_instr, 24))
- offset = -4;
+ dsc->u.block.load = load;
+ dsc->u.block.user = 0;
+ dsc->u.block.increment = bit (insn1, 7);
+ dsc->u.block.before = bit (insn1, 8);
+ dsc->u.block.writeback = writeback;
+ dsc->u.block.cond = INST_AL;
+ dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn);
+
+ if (load)
+ {
+ if (dsc->u.block.regmask == 0xffff)
+ {
+ /* This branch is impossible to happen. */
+ gdb_assert (0);
+ }
+ else
+ {
+ unsigned int regmask = dsc->u.block.regmask;
+ unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1;
+ unsigned int to = 0, from = 0, i, new_rn;
- {
- unsigned long rn_val =
- get_frame_register_unsigned (frame,
- bits (this_instr, 16, 19));
- nextpc =
- (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val
- + offset),
- 4, byte_order);
- }
- }
- }
- break;
+ for (i = 0; i < num_in_list; i++)
+ dsc->tmp[i] = displaced_read_reg (regs, dsc, i);
- case 0xb: /* branch & link */
- case 0xa: /* branch */
- {
- nextpc = BranchDest (pc, this_instr);
- break;
- }
+ if (writeback)
+ insn1 &= ~(1 << 5);
- case 0xc:
- case 0xd:
- case 0xe: /* coproc ops */
- break;
- case 0xf: /* SWI */
- {
- struct gdbarch_tdep *tdep;
- tdep = gdbarch_tdep (gdbarch);
+ new_regmask = (1 << num_in_list) - 1;
- if (tdep->syscall_next_pc != NULL)
- nextpc = tdep->syscall_next_pc (frame);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, "
+ "{..., pc}: original reg list %.4x, modified "
+ "list %.4x\n"), rn, writeback ? "!" : "",
+ (int) dsc->u.block.regmask, new_regmask);
- }
- break;
+ dsc->modinsn[0] = insn1;
+ dsc->modinsn[1] = (new_regmask & 0xffff);
+ dsc->numinsns = 2;
- default:
- fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n"));
- return (pc);
+ dsc->cleanup = &cleanup_block_load_pc;
}
}
-
- return nextpc;
-}
-
-CORE_ADDR
-arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- CORE_ADDR nextpc =
- gdbarch_addr_bits_remove (gdbarch,
- arm_get_next_pc_raw (frame, pc, TRUE));
- if (nextpc == pc)
- error (_("Infinite loop detected"));
- return nextpc;
+ else
+ {
+ dsc->modinsn[0] = insn1;
+ dsc->modinsn[1] = insn2;
+ dsc->numinsns = 2;
+ dsc->cleanup = &cleanup_block_store_pc;
+ }
+ return 0;
}
-/* single_step() is called just before we want to resume the inferior,
- if we want to single-step it but there is no hardware or kernel
- single-step support. We find the target of the coming instruction
- and breakpoint it. */
+/* Cleanup/copy SVC (SWI) instructions. These two functions are overridden
+ for Linux, where some SVC instructions must be treated specially. */
-int
-arm_software_single_step (struct frame_info *frame)
+static void
+cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct address_space *aspace = get_frame_address_space (frame);
-
- /* NOTE: This may insert the wrong breakpoint instruction when
- single-stepping over a mode-changing instruction, if the
- CPSR heuristics are used. */
+ CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size;
- CORE_ADDR next_pc = arm_get_next_pc (frame, get_frame_pc (frame));
- insert_single_step_breakpoint (gdbarch, aspace, next_pc);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at "
+ "%.8lx\n", (unsigned long) resume_addr);
- return 1;
+ displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC);
}
-/* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand
- the buffer to be NEW_LEN bytes ending at ENDADDR. Return
- NULL if an error occurs. BUF is freed. */
-static gdb_byte *
-extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr,
- int old_len, int new_len)
+/* Common copy routine for svc instruciton. */
+
+static int
+install_svc (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- gdb_byte *new_buf, *middle;
- int bytes_to_read = new_len - old_len;
+ /* Preparation: none.
+ Insn: unmodified svc.
+ Cleanup: pc <- insn_addr + insn_size. */
- new_buf = xmalloc (new_len);
- memcpy (new_buf + bytes_to_read, buf, old_len);
- xfree (buf);
- if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0)
+ /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
+ instruction. */
+ dsc->wrote_to_pc = 1;
+
+ /* Allow OS-specific code to override SVC handling. */
+ if (dsc->u.svc.copy_svc_os)
+ return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc);
+ else
{
- xfree (new_buf);
- return NULL;
+ dsc->cleanup = &cleanup_svc;
+ return 0;
}
- return new_buf;
}
-/* An IT block is at most the 2-byte IT instruction followed by
- four 4-byte instructions. The furthest back we must search to
- find an IT block that affects the current instruction is thus
- 2 + 3 * 4 == 14 bytes. */
-#define MAX_IT_BLOCK_PREFIX 14
+static int
+arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs, struct displaced_step_closure *dsc)
+{
-/* Use a quick scan if there are more than this many bytes of
- code. */
-#define IT_SCAN_THRESHOLD 32
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n",
+ (unsigned long) insn);
-/* Adjust a breakpoint's address to move breakpoints out of IT blocks.
- A breakpoint in an IT block may not be hit, depending on the
- condition flags. */
-static CORE_ADDR
-arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
+ dsc->modinsn[0] = insn;
+
+ return install_svc (gdbarch, regs, dsc);
+}
+
+static int
+thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn,
+ struct regcache *regs, struct displaced_step_closure *dsc)
{
- gdb_byte *buf;
- char map_type;
- CORE_ADDR boundary, func_start;
- int buf_len, buf2_len;
- enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch);
- int i, any, last_it, last_it_count;
- /* If we are using BKPT breakpoints, none of this is necessary. */
- if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL)
- return bpaddr;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n",
+ insn);
- /* ARM mode does not have this problem. */
- if (!arm_pc_is_thumb (gdbarch, bpaddr))
- return bpaddr;
+ dsc->modinsn[0] = insn;
- /* We are setting a breakpoint in Thumb code that could potentially
- contain an IT block. The first step is to find how much Thumb
- code there is; we do not need to read outside of known Thumb
- sequences. */
- map_type = arm_find_mapping_symbol (bpaddr, &boundary);
- if (map_type == 0)
- /* Thumb-2 code must have mapping symbols to have a chance. */
- return bpaddr;
+ return install_svc (gdbarch, regs, dsc);
+}
- bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr);
+/* Copy undefined instructions. */
- if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL)
- && func_start > boundary)
- boundary = func_start;
+static int
+arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn,
+ struct displaced_step_closure *dsc)
+{
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying undefined insn %.8lx\n",
+ (unsigned long) insn);
- /* Search for a candidate IT instruction. We have to do some fancy
- footwork to distinguish a real IT instruction from the second
- half of a 32-bit instruction, but there is no need for that if
- there's no candidate. */
- buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX);
- if (buf_len == 0)
- /* No room for an IT instruction. */
- return bpaddr;
+ dsc->modinsn[0] = insn;
- buf = xmalloc (buf_len);
- if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0)
- return bpaddr;
- any = 0;
- for (i = 0; i < buf_len; i += 2)
- {
- unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
- if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
- {
- any = 1;
- break;
- }
- }
- if (any == 0)
- {
- xfree (buf);
- return bpaddr;
- }
+ return 0;
+}
- /* OK, the code bytes before this instruction contain at least one
- halfword which resembles an IT instruction. We know that it's
- Thumb code, but there are still two possibilities. Either the
- halfword really is an IT instruction, or it is the second half of
- a 32-bit Thumb instruction. The only way we can tell is to
- scan forwards from a known instruction boundary. */
- if (bpaddr - boundary > IT_SCAN_THRESHOLD)
- {
- int definite;
+static int
+thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
+ struct displaced_step_closure *dsc)
+{
- /* There's a lot of code before this instruction. Start with an
- optimistic search; it's easy to recognize halfwords that can
- not be the start of a 32-bit instruction, and use that to
- lock on to the instruction boundaries. */
- buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD);
- if (buf == NULL)
- return bpaddr;
- buf_len = IT_SCAN_THRESHOLD;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn "
+ "%.4x %.4x\n", (unsigned short) insn1,
+ (unsigned short) insn2);
- definite = 0;
- for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2)
- {
- unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
- if (thumb_insn_size (inst1) == 2)
- {
- definite = 1;
- break;
- }
- }
+ dsc->modinsn[0] = insn1;
+ dsc->modinsn[1] = insn2;
+ dsc->numinsns = 2;
- /* At this point, if DEFINITE, BUF[I] is the first place we
- are sure that we know the instruction boundaries, and it is far
- enough from BPADDR that we could not miss an IT instruction
- affecting BPADDR. If ! DEFINITE, give up - start from a
- known boundary. */
- if (! definite)
- {
- buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary);
- if (buf == NULL)
- return bpaddr;
- buf_len = bpaddr - boundary;
- i = 0;
- }
- }
- else
+ return 0;
+}
+
+/* Copy unpredictable instructions. */
+
+static int
+arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn,
+ struct displaced_step_closure *dsc)
+{
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn "
+ "%.8lx\n", (unsigned long) insn);
+
+ dsc->modinsn[0] = insn;
+
+ return 0;
+}
+
+/* The decode_* functions are instruction decoding helpers. They mostly follow
+ the presentation in the ARM ARM. */
+
+static int
+arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7);
+ unsigned int rn = bits (insn, 16, 19);
+
+ if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0)
+ return arm_copy_unmodified (gdbarch, insn, "cps", dsc);
+ else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1)
+ return arm_copy_unmodified (gdbarch, insn, "setend", dsc);
+ else if ((op1 & 0x60) == 0x20)
+ return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc);
+ else if ((op1 & 0x71) == 0x40)
+ return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store",
+ dsc);
+ else if ((op1 & 0x77) == 0x41)
+ return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc);
+ else if ((op1 & 0x77) == 0x45)
+ return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */
+ else if ((op1 & 0x77) == 0x51)
{
- buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary);
- if (buf == NULL)
- return bpaddr;
- buf_len = bpaddr - boundary;
- i = 0;
+ if (rn != 0xf)
+ return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */
+ else
+ return arm_copy_unpred (gdbarch, insn, dsc);
}
+ else if ((op1 & 0x77) == 0x55)
+ return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */
+ else if (op1 == 0x57)
+ switch (op2)
+ {
+ case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc);
+ case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc);
+ case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc);
+ case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc);
+ default: return arm_copy_unpred (gdbarch, insn, dsc);
+ }
+ else if ((op1 & 0x63) == 0x43)
+ return arm_copy_unpred (gdbarch, insn, dsc);
+ else if ((op2 & 0x1) == 0x0)
+ switch (op1 & ~0x80)
+ {
+ case 0x61:
+ return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc);
+ case 0x65:
+ return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */
+ case 0x71: case 0x75:
+ /* pld/pldw reg. */
+ return arm_copy_preload_reg (gdbarch, insn, regs, dsc);
+ case 0x63: case 0x67: case 0x73: case 0x77:
+ return arm_copy_unpred (gdbarch, insn, dsc);
+ default:
+ return arm_copy_undef (gdbarch, insn, dsc);
+ }
+ else
+ return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */
+}
- /* Scan forwards. Find the last IT instruction before BPADDR. */
- last_it = -1;
- last_it_count = 0;
- while (i < buf_len)
+static int
+arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ if (bit (insn, 27) == 0)
+ return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc);
+ /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */
+ else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20))
{
- unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order);
- last_it_count--;
- if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0)
- {
- last_it = i;
- if (inst1 & 0x0001)
- last_it_count = 4;
- else if (inst1 & 0x0002)
- last_it_count = 3;
- else if (inst1 & 0x0004)
- last_it_count = 2;
- else
- last_it_count = 1;
- }
- i += thumb_insn_size (inst1);
- }
+ case 0x0: case 0x2:
+ return arm_copy_unmodified (gdbarch, insn, "srs", dsc);
- xfree (buf);
+ case 0x1: case 0x3:
+ return arm_copy_unmodified (gdbarch, insn, "rfe", dsc);
- if (last_it == -1)
- /* There wasn't really an IT instruction after all. */
- return bpaddr;
+ case 0x4: case 0x5: case 0x6: case 0x7:
+ return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc);
- if (last_it_count < 1)
- /* It was too far away. */
- return bpaddr;
+ case 0x8:
+ switch ((insn & 0xe00000) >> 21)
+ {
+ case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7:
+ /* stc/stc2. */
+ return arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
- /* This really is a trouble spot. Move the breakpoint to the IT
- instruction. */
- return bpaddr - buf_len + last_it;
-}
+ case 0x2:
+ return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc);
-/* ARM displaced stepping support.
+ default:
+ return arm_copy_undef (gdbarch, insn, dsc);
+ }
- Generally ARM displaced stepping works as follows:
+ case 0x9:
+ {
+ int rn_f = (bits (insn, 16, 19) == 0xf);
+ switch ((insn & 0xe00000) >> 21)
+ {
+ case 0x1: case 0x3:
+ /* ldc/ldc2 imm (undefined for rn == pc). */
+ return rn_f ? arm_copy_undef (gdbarch, insn, dsc)
+ : arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
- 1. When an instruction is to be single-stepped, it is first decoded by
- arm_process_displaced_insn (called from arm_displaced_step_copy_insn).
- Depending on the type of instruction, it is then copied to a scratch
- location, possibly in a modified form. The copy_* set of functions
- performs such modification, as necessary. A breakpoint is placed after
- the modified instruction in the scratch space to return control to GDB.
- Note in particular that instructions which modify the PC will no longer
- do so after modification.
+ case 0x2:
+ return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc);
- 2. The instruction is single-stepped, by setting the PC to the scratch
- location address, and resuming. Control returns to GDB when the
- breakpoint is hit.
+ case 0x4: case 0x5: case 0x6: case 0x7:
+ /* ldc/ldc2 lit (undefined for rn != pc). */
+ return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc)
+ : arm_copy_undef (gdbarch, insn, dsc);
- 3. A cleanup function (cleanup_*) is called corresponding to the copy_*
- function used for the current instruction. This function's job is to
- put the CPU/memory state back to what it would have been if the
- instruction had been executed unmodified in its original location. */
+ default:
+ return arm_copy_undef (gdbarch, insn, dsc);
+ }
+ }
-/* NOP instruction (mov r0, r0). */
-#define ARM_NOP 0xe1a00000
+ case 0xa:
+ return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc);
-/* Helper for register reads for displaced stepping. In particular, this
- returns the PC as it would be seen by the instruction at its original
- location. */
+ case 0xb:
+ if (bits (insn, 16, 19) == 0xf)
+ /* ldc/ldc2 lit. */
+ return arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
-ULONGEST
-displaced_read_reg (struct regcache *regs, CORE_ADDR from, int regno)
-{
- ULONGEST ret;
+ case 0xc:
+ if (bit (insn, 4))
+ return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc);
+ else
+ return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
- if (regno == 15)
- {
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n",
- (unsigned long) from + 8);
- return (ULONGEST) from + 8; /* Pipeline offset. */
- }
- else
- {
- regcache_cooked_read_unsigned (regs, regno, &ret);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n",
- regno, (unsigned long) ret);
- return ret;
+ case 0xd:
+ if (bit (insn, 4))
+ return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc);
+ else
+ return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
+
+ default:
+ return arm_copy_undef (gdbarch, insn, dsc);
}
}
+/* Decode miscellaneous instructions in dp/misc encoding space. */
+
static int
-displaced_in_arm_mode (struct regcache *regs)
+arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- ULONGEST ps;
- ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs));
+ unsigned int op2 = bits (insn, 4, 6);
+ unsigned int op = bits (insn, 21, 22);
+ unsigned int op1 = bits (insn, 16, 19);
- regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps);
+ switch (op2)
+ {
+ case 0x0:
+ return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc);
- return (ps & t_bit) == 0;
-}
+ case 0x1:
+ if (op == 0x1) /* bx. */
+ return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc);
+ else if (op == 0x3)
+ return arm_copy_unmodified (gdbarch, insn, "clz", dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
-/* Write to the PC as from a branch instruction. */
+ case 0x2:
+ if (op == 0x1)
+ /* Not really supported. */
+ return arm_copy_unmodified (gdbarch, insn, "bxj", dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
-static void
-branch_write_pc (struct regcache *regs, ULONGEST val)
-{
- if (displaced_in_arm_mode (regs))
- /* Note: If bits 0/1 are set, this branch would be unpredictable for
- architecture versions < 6. */
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & ~(ULONGEST) 0x3);
- else
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & ~(ULONGEST) 0x1);
-}
+ case 0x3:
+ if (op == 0x1)
+ return arm_copy_bx_blx_reg (gdbarch, insn,
+ regs, dsc); /* blx register. */
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
-/* Write to the PC as from a branch-exchange instruction. */
+ case 0x5:
+ return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc);
-static void
-bx_write_pc (struct regcache *regs, ULONGEST val)
+ case 0x7:
+ if (op == 0x1)
+ return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc);
+ else if (op == 0x3)
+ /* Not really supported. */
+ return arm_copy_unmodified (gdbarch, insn, "smc", dsc);
+
+ default:
+ return arm_copy_undef (gdbarch, insn, dsc);
+ }
+}
+
+static int
+arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- ULONGEST ps;
- ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs));
+ if (bit (insn, 25))
+ switch (bits (insn, 20, 24))
+ {
+ case 0x10:
+ return arm_copy_unmodified (gdbarch, insn, "movw", dsc);
- regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps);
+ case 0x14:
+ return arm_copy_unmodified (gdbarch, insn, "movt", dsc);
- if ((val & 1) == 1)
- {
- regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit);
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe);
- }
- else if ((val & 2) == 0)
- {
- regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit);
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val);
- }
+ case 0x12: case 0x16:
+ return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc);
+
+ default:
+ return arm_copy_alu_imm (gdbarch, insn, regs, dsc);
+ }
else
{
- /* Unpredictable behaviour. Try to do something sensible (switch to ARM
- mode, align dest to 4 bytes). */
- warning (_("Single-stepping BX to non-word-aligned ARM instruction."));
- regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit);
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc);
- }
-}
+ uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7);
-/* Write to the PC as if from a load instruction. */
+ if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0)
+ return arm_copy_alu_reg (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1)
+ return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0)
+ return arm_decode_miscellaneous (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8)
+ return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc);
+ else if ((op1 & 0x10) == 0x00 && op2 == 0x9)
+ return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc);
+ else if ((op1 & 0x10) == 0x10 && op2 == 0x9)
+ return arm_copy_unmodified (gdbarch, insn, "synch", dsc);
+ else if (op2 == 0xb || (op2 & 0xd) == 0xd)
+ /* 2nd arg means "unpriveleged". */
+ return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs,
+ dsc);
+ }
-static void
-load_write_pc (struct regcache *regs, ULONGEST val)
-{
- if (DISPLACED_STEPPING_ARCH_VERSION >= 5)
- bx_write_pc (regs, val);
- else
- branch_write_pc (regs, val);
+ /* Should be unreachable. */
+ return 1;
}
-/* Write to the PC as if from an ALU instruction. */
-
-static void
-alu_write_pc (struct regcache *regs, ULONGEST val)
+static int
+arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && displaced_in_arm_mode (regs))
- bx_write_pc (regs, val);
- else
- branch_write_pc (regs, val);
-}
+ int a = bit (insn, 25), b = bit (insn, 4);
+ uint32_t op1 = bits (insn, 20, 24);
+ int rn_f = bits (insn, 16, 19) == 0xf;
+
+ if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02)
+ || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0);
+ else if ((!a && (op1 & 0x17) == 0x02)
+ || (a && (op1 & 0x17) == 0x02 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1);
+ else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03)
+ || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0);
+ else if ((!a && (op1 & 0x17) == 0x03)
+ || (a && (op1 & 0x17) == 0x03 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1);
+ else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06)
+ || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0);
+ else if ((!a && (op1 & 0x17) == 0x06)
+ || (a && (op1 & 0x17) == 0x06 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1);
+ else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07)
+ || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0);
+ else if ((!a && (op1 & 0x17) == 0x07)
+ || (a && (op1 & 0x17) == 0x07 && !b))
+ return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1);
-/* Helper for writing to registers for displaced stepping. Writing to the PC
- has a varying effects depending on the instruction which does the write:
- this is controlled by the WRITE_PC argument. */
+ /* Should be unreachable. */
+ return 1;
+}
-void
-displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc,
- int regno, ULONGEST val, enum pc_write_style write_pc)
+static int
+arm_decode_media (struct gdbarch *gdbarch, uint32_t insn,
+ struct displaced_step_closure *dsc)
{
- if (regno == 15)
+ switch (bits (insn, 20, 24))
{
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n",
- (unsigned long) val);
- switch (write_pc)
- {
- case BRANCH_WRITE_PC:
- branch_write_pc (regs, val);
- break;
+ case 0x00: case 0x01: case 0x02: case 0x03:
+ return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc);
- case BX_WRITE_PC:
- bx_write_pc (regs, val);
- break;
+ case 0x04: case 0x05: case 0x06: case 0x07:
+ return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc);
- case LOAD_WRITE_PC:
- load_write_pc (regs, val);
- break;
+ case 0x08: case 0x09: case 0x0a: case 0x0b:
+ case 0x0c: case 0x0d: case 0x0e: case 0x0f:
+ return arm_copy_unmodified (gdbarch, insn,
+ "decode/pack/unpack/saturate/reverse", dsc);
- case ALU_WRITE_PC:
- alu_write_pc (regs, val);
- break;
+ case 0x18:
+ if (bits (insn, 5, 7) == 0) /* op2. */
+ {
+ if (bits (insn, 12, 15) == 0xf)
+ return arm_copy_unmodified (gdbarch, insn, "usad8", dsc);
+ else
+ return arm_copy_unmodified (gdbarch, insn, "usada8", dsc);
+ }
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
- case CANNOT_WRITE_PC:
- warning (_("Instruction wrote to PC in an unexpected way when "
- "single-stepping"));
- break;
+ case 0x1a: case 0x1b:
+ if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */
+ return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
- default:
- internal_error (__FILE__, __LINE__,
- _("Invalid argument to displaced_write_reg"));
+ case 0x1c: case 0x1d:
+ if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */
+ {
+ if (bits (insn, 0, 3) == 0xf)
+ return arm_copy_unmodified (gdbarch, insn, "bfc", dsc);
+ else
+ return arm_copy_unmodified (gdbarch, insn, "bfi", dsc);
}
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
- dsc->wrote_to_pc = 1;
- }
- else
- {
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n",
- regno, (unsigned long) val);
- regcache_cooked_write_unsigned (regs, regno, val);
+ case 0x1e: case 0x1f:
+ if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */
+ return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc);
}
+
+ /* Should be unreachable. */
+ return 1;
}
-/* This function is used to concisely determine if an instruction INSN
- references PC. Register fields of interest in INSN should have the
- corresponding fields of BITMASK set to 0b1111. The function returns return 1
- if any of these fields in INSN reference the PC (also 0b1111, r15), else it
- returns 0. */
+static int
+arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ if (bit (insn, 25))
+ return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc);
+ else
+ return arm_copy_block_xfer (gdbarch, insn, regs, dsc);
+}
static int
-insn_references_pc (uint32_t insn, uint32_t bitmask)
+arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- uint32_t lowbit = 1;
+ unsigned int opcode = bits (insn, 20, 24);
- while (bitmask != 0)
+ switch (opcode)
{
- uint32_t mask;
-
- for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1)
- ;
-
- if (!lowbit)
- break;
+ case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */
+ return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc);
- mask = lowbit * 0xf;
+ case 0x08: case 0x0a: case 0x0c: case 0x0e:
+ case 0x12: case 0x16:
+ return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc);
- if ((insn & mask) == mask)
- return 1;
+ case 0x09: case 0x0b: case 0x0d: case 0x0f:
+ case 0x13: case 0x17:
+ return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc);
- bitmask &= ~mask;
+ case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
+ case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
+ /* Note: no writeback for these instructions. Bit 25 will always be
+ zero though (via caller), so the following works OK. */
+ return arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
}
- return 0;
+ /* Should be unreachable. */
+ return 1;
}
-/* The simplest copy function. Many instructions have the same effect no
- matter what address they are executed at: in those cases, use this. */
+/* Decode shifted register instructions. */
static int
-copy_unmodified (struct gdbarch *gdbarch, uint32_t insn,
- const char *iname, struct displaced_step_closure *dsc)
+thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, "
- "opcode/class '%s' unmodified\n", (unsigned long) insn,
- iname);
+ /* PC is only allowed to be used in instruction MOV. */
- dsc->modinsn[0] = insn;
+ unsigned int op = bits (insn1, 5, 8);
+ unsigned int rn = bits (insn1, 0, 3);
- return 0;
+ if (op == 0x2 && rn == 0xf) /* MOV */
+ return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc);
+ else
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "dp (shift reg)", dsc);
}
-/* Preload instructions with immediate offset. */
-static void
-cleanup_preload (struct gdbarch *gdbarch,
- struct regcache *regs, struct displaced_step_closure *dsc)
-{
- displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
- if (!dsc->u.preload.immed)
- displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
-}
+/* Decode extension register load/store. Exactly the same as
+ arm_decode_ext_reg_ld_st. */
static int
-copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int rn = bits (insn, 16, 19);
- ULONGEST rn_val;
- CORE_ADDR from = dsc->insn_addr;
-
- if (!insn_references_pc (insn, 0x000f0000ul))
- return copy_unmodified (gdbarch, insn, "preload", dsc);
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n",
- (unsigned long) insn);
-
- /* Preload instructions:
-
- {pli/pld} [rn, #+/-imm]
- ->
- {pli/pld} [r0, #+/-imm]. */
-
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- rn_val = displaced_read_reg (regs, from, rn);
- displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
-
- dsc->u.preload.immed = 1;
+ unsigned int opcode = bits (insn1, 4, 8);
- dsc->modinsn[0] = insn & 0xfff0ffff;
+ switch (opcode)
+ {
+ case 0x04: case 0x05:
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "vfp/neon vmov", dsc);
+
+ case 0x08: case 0x0c: /* 01x00 */
+ case 0x0a: case 0x0e: /* 01x10 */
+ case 0x12: case 0x16: /* 10x10 */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "vfp/neon vstm/vpush", dsc);
+
+ case 0x09: case 0x0d: /* 01x01 */
+ case 0x0b: case 0x0f: /* 01x11 */
+ case 0x13: case 0x17: /* 10x11 */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "vfp/neon vldm/vpop", dsc);
- dsc->cleanup = &cleanup_preload;
+ case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "vstr", dsc);
+ case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
+ return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc);
+ }
- return 0;
+ /* Should be unreachable. */
+ return 1;
}
-/* Preload instructions with register offset. */
-
static int
-copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
+ struct regcache *regs, struct displaced_step_closure *dsc)
{
+ unsigned int op1 = bits (insn, 20, 25);
+ int op = bit (insn, 4);
+ unsigned int coproc = bits (insn, 8, 11);
unsigned int rn = bits (insn, 16, 19);
- unsigned int rm = bits (insn, 0, 3);
- ULONGEST rn_val, rm_val;
- CORE_ADDR from = dsc->insn_addr;
-
- if (!insn_references_pc (insn, 0x000f000ful))
- return copy_unmodified (gdbarch, insn, "preload reg", dsc);
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n",
- (unsigned long) insn);
-
- /* Preload register-offset instructions:
-
- {pli/pld} [rn, rm {, shift}]
- ->
- {pli/pld} [r0, r1 {, shift}]. */
-
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- dsc->tmp[1] = displaced_read_reg (regs, from, 1);
- rn_val = displaced_read_reg (regs, from, rn);
- rm_val = displaced_read_reg (regs, from, rm);
- displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC);
- dsc->u.preload.immed = 0;
+ if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa)
+ return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00
+ && (coproc & 0xe) != 0xa)
+ /* stc/stc2. */
+ return arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00
+ && (coproc & 0xe) != 0xa)
+ /* ldc/ldc2 imm/lit. */
+ return arm_copy_copro_load_store (gdbarch, insn, regs, dsc);
+ else if ((op1 & 0x3e) == 0x00)
+ return arm_copy_undef (gdbarch, insn, dsc);
+ else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc);
+ else if (op1 == 0x04 && (coproc & 0xe) != 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc);
+ else if (op1 == 0x05 && (coproc & 0xe) != 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc);
+ else if ((op1 & 0x30) == 0x20 && !op)
+ {
+ if ((coproc & 0xe) == 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc);
+ else
+ return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
+ }
+ else if ((op1 & 0x30) == 0x20 && op)
+ return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc);
+ else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc);
+ else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa)
+ return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc);
+ else if ((op1 & 0x30) == 0x30)
+ return arm_copy_svc (gdbarch, insn, regs, dsc);
+ else
+ return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */
+}
- dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1;
+static int
+thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int coproc = bits (insn2, 8, 11);
+ unsigned int op1 = bits (insn1, 4, 9);
+ unsigned int bit_5_8 = bits (insn1, 5, 8);
+ unsigned int bit_9 = bit (insn1, 9);
+ unsigned int bit_4 = bit (insn1, 4);
+ unsigned int rn = bits (insn1, 0, 3);
- dsc->cleanup = &cleanup_preload;
+ if (bit_9 == 0)
+ {
+ if (bit_5_8 == 2)
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2",
+ dsc);
+ else if (bit_5_8 == 0) /* UNDEFINED. */
+ return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc);
+ else
+ {
+ /*coproc is 101x. SIMD/VFP, ext registers load/store. */
+ if ((coproc & 0xe) == 0xa)
+ return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs,
+ dsc);
+ else /* coproc is not 101x. */
+ {
+ if (bit_4 == 0) /* STC/STC2. */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "stc/stc2", dsc);
+ else /* LDC/LDC2 {literal, immeidate}. */
+ return thumb2_copy_copro_load_store (gdbarch, insn1, insn2,
+ regs, dsc);
+ }
+ }
+ }
+ else
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc);
return 0;
}
-/* Copy/cleanup coprocessor load and store instructions. */
-
static void
-cleanup_copro_load_store (struct gdbarch *gdbarch,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
+install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc, int rd)
{
- ULONGEST rn_val = displaced_read_reg (regs, dsc->insn_addr, 0);
+ /* ADR Rd, #imm
- displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
+ Rewrite as:
- if (dsc->u.ldst.writeback)
- displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC);
+ Preparation: Rd <- PC
+ Insn: ADD Rd, #imm
+ Cleanup: Null.
+ */
+
+ /* Rd <- PC */
+ int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM);
+ displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC);
}
static int
-copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
+thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc,
+ int rd, unsigned int imm)
{
- unsigned int rn = bits (insn, 16, 19);
- ULONGEST rn_val;
- CORE_ADDR from = dsc->insn_addr;
-
- if (!insn_references_pc (insn, 0x000f0000ul))
- return copy_unmodified (gdbarch, insn, "copro load/store", dsc);
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor "
- "load/store insn %.8lx\n", (unsigned long) insn);
-
- /* Coprocessor load/store instructions:
-
- {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes)
- ->
- {stc/stc2} [r0, #+/-imm].
- ldc/ldc2 are handled identically. */
+ /* Encoding T2: ADDS Rd, #imm */
+ dsc->modinsn[0] = (0x3000 | (rd << 8) | imm);
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- rn_val = displaced_read_reg (regs, from, rn);
- displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC);
+ install_pc_relative (gdbarch, regs, dsc, rd);
- dsc->u.ldst.writeback = bit (insn, 25);
- dsc->u.ldst.rn = rn;
+ return 0;
+}
- dsc->modinsn[0] = insn & 0xfff0ffff;
+static int
+thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rd = bits (insn, 8, 10);
+ unsigned int imm8 = bits (insn, 0, 7);
- dsc->cleanup = &cleanup_copro_load_store;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying thumb adr r%d, #%d insn %.4x\n",
+ rd, imm8, insn);
- return 0;
+ return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8);
}
-/* Clean up branch instructions (actually perform the branch, by setting
- PC). */
-
-static void
-cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
-{
- ULONGEST from = dsc->insn_addr;
- uint32_t status = displaced_read_reg (regs, from, ARM_PS_REGNUM);
- int branch_taken = condition_true (dsc->u.branch.cond, status);
- enum pc_write_style write_pc = dsc->u.branch.exchange
- ? BX_WRITE_PC : BRANCH_WRITE_PC;
+static int
+thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ unsigned int rd = bits (insn2, 8, 11);
+ /* Since immediate has the same encoding in ADR ADD and SUB, so we simply
+ extract raw immediate encoding rather than computing immediate. When
+ generating ADD or SUB instruction, we can simply perform OR operation to
+ set immediate into ADD. */
+ unsigned int imm_3_8 = insn2 & 0x70ff;
+ unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */
- if (!branch_taken)
- return;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n",
+ rd, imm_i, imm_3_8, insn1, insn2);
- if (dsc->u.branch.link)
+ if (bit (insn1, 7)) /* Encoding T2 */
+ {
+ /* Encoding T3: SUB Rd, Rd, #imm */
+ dsc->modinsn[0] = (0xf1a0 | rd | imm_i);
+ dsc->modinsn[1] = ((rd << 8) | imm_3_8);
+ }
+ else /* Encoding T3 */
{
- ULONGEST pc = displaced_read_reg (regs, from, 15);
- displaced_write_reg (regs, dsc, 14, pc - 4, CANNOT_WRITE_PC);
+ /* Encoding T3: ADD Rd, Rd, #imm */
+ dsc->modinsn[0] = (0xf100 | rd | imm_i);
+ dsc->modinsn[1] = ((rd << 8) | imm_3_8);
}
+ dsc->numinsns = 2;
- displaced_write_reg (regs, dsc, 15, dsc->u.branch.dest, write_pc);
-}
+ install_pc_relative (gdbarch, regs, dsc, rd);
-/* Copy B/BL/BLX instructions with immediate destinations. */
+ return 0;
+}
static int
-copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, unsigned short insn1,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int cond = bits (insn, 28, 31);
- int exchange = (cond == 0xf);
- int link = exchange || bit (insn, 24);
+ unsigned int rt = bits (insn1, 8, 10);
+ unsigned int pc;
+ int imm8 = (bits (insn1, 0, 7) << 2);
CORE_ADDR from = dsc->insn_addr;
- long offset;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn "
- "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b",
- (unsigned long) insn);
+ /* LDR Rd, #imm8
- /* Implement "BL<cond> <label>" as:
+ Rwrite as:
- Preparation: cond <- instruction condition
- Insn: mov r0, r0 (nop)
- Cleanup: if (condition true) { r14 <- pc; pc <- label }.
+ Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8;
- B<cond> similar, but don't set r14 in cleanup. */
+ Insn: LDR R0, [R2, R3];
+ Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */
- if (exchange)
- /* For BLX, set bit 0 of the destination. The cleanup_branch function will
- then arrange the switch into Thumb mode. */
- offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1;
- else
- offset = bits (insn, 0, 23) << 2;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying thumb ldr r%d [pc #%d]\n"
+ , rt, imm8);
- if (bit (offset, 25))
- offset = offset | ~0x3ffffff;
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 0);
+ dsc->tmp[2] = displaced_read_reg (regs, dsc, 2);
+ dsc->tmp[3] = displaced_read_reg (regs, dsc, 3);
+ pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM);
+ /* The assembler calculates the required value of the offset from the
+ Align(PC,4) value of this instruction to the label. */
+ pc = pc & 0xfffffffc;
- dsc->u.branch.cond = cond;
- dsc->u.branch.link = link;
- dsc->u.branch.exchange = exchange;
- dsc->u.branch.dest = from + 8 + offset;
+ displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC);
+ displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC);
- dsc->modinsn[0] = ARM_NOP;
+ dsc->rd = rt;
+ dsc->u.ldst.xfersize = 4;
+ dsc->u.ldst.rn = 0;
+ dsc->u.ldst.immed = 0;
+ dsc->u.ldst.writeback = 0;
+ dsc->u.ldst.restore_r4 = 0;
- dsc->cleanup = &cleanup_branch;
+ dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/
+
+ dsc->cleanup = &cleanup_load;
return 0;
}
-/* Copy BX/BLX with register-specified destinations. */
+/* Copy Thumb cbnz/cbz insruction. */
static int
-copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int cond = bits (insn, 28, 31);
- /* BX: x12xxx1x
- BLX: x12xxx3x. */
- int link = bit (insn, 5);
- unsigned int rm = bits (insn, 0, 3);
+ int non_zero = bit (insn1, 11);
+ unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1);
CORE_ADDR from = dsc->insn_addr;
+ int rn = bits (insn1, 0, 2);
+ int rn_val = displaced_read_reg (regs, dsc, rn);
+
+ dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero);
+ /* CBNZ and CBZ do not affect the condition flags. If condition is true,
+ set it INST_AL, so cleanup_branch will know branch is taken, otherwise,
+ condition is false, let it be, cleanup_branch will do nothing. */
+ if (dsc->u.branch.cond)
+ {
+ dsc->u.branch.cond = INST_AL;
+ dsc->u.branch.dest = from + 4 + imm5;
+ }
+ else
+ dsc->u.branch.dest = from + 2;
+
+ dsc->u.branch.link = 0;
+ dsc->u.branch.exchange = 0;
if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying %s register insn "
- "%.8lx\n", (link) ? "blx" : "bx", (unsigned long) insn);
+ fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]"
+ " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz",
+ rn, rn_val, insn1, dsc->u.branch.dest);
- /* Implement {BX,BLX}<cond> <reg>" as:
+ dsc->modinsn[0] = THUMB_NOP;
- Preparation: cond <- instruction condition
- Insn: mov r0, r0 (nop)
- Cleanup: if (condition true) { r14 <- pc; pc <- dest; }.
+ dsc->cleanup = &cleanup_branch;
+ return 0;
+}
- Don't set r14 in cleanup for BX. */
+/* Copy Table Branch Byte/Halfword */
+static int
+thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ ULONGEST rn_val, rm_val;
+ int is_tbh = bit (insn2, 4);
+ CORE_ADDR halfwords = 0;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- dsc->u.branch.dest = displaced_read_reg (regs, from, rm);
+ rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3));
+ rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3));
- dsc->u.branch.cond = cond;
- dsc->u.branch.link = link;
- dsc->u.branch.exchange = 1;
+ if (is_tbh)
+ {
+ gdb_byte buf[2];
- dsc->modinsn[0] = ARM_NOP;
+ target_read_memory (rn_val + 2 * rm_val, buf, 2);
+ halfwords = extract_unsigned_integer (buf, 2, byte_order);
+ }
+ else
+ {
+ gdb_byte buf[1];
+
+ target_read_memory (rn_val + rm_val, buf, 1);
+ halfwords = extract_unsigned_integer (buf, 1, byte_order);
+ }
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x"
+ " offset 0x%x\n", is_tbh ? "tbh" : "tbb",
+ (unsigned int) rn_val, (unsigned int) rm_val,
+ (unsigned int) halfwords);
+
+ dsc->u.branch.cond = INST_AL;
+ dsc->u.branch.link = 0;
+ dsc->u.branch.exchange = 0;
+ dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords;
dsc->cleanup = &cleanup_branch;
return 0;
}
-/* Copy/cleanup arithmetic/logic instruction with immediate RHS. */
-
static void
-cleanup_alu_imm (struct gdbarch *gdbarch,
- struct regcache *regs, struct displaced_step_closure *dsc)
+cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- ULONGEST rd_val = displaced_read_reg (regs, dsc->insn_addr, 0);
- displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+ /* PC <- r7 */
+ int val = displaced_read_reg (regs, dsc, 7);
+ displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC);
+
+ /* r7 <- r8 */
+ val = displaced_read_reg (regs, dsc, 8);
+ displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC);
+
+ /* r8 <- tmp[0] */
+ displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC);
+
}
static int
-copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, unsigned short insn1,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int rn = bits (insn, 16, 19);
- unsigned int rd = bits (insn, 12, 15);
- unsigned int op = bits (insn, 21, 24);
- int is_mov = (op == 0xd);
- ULONGEST rd_val, rn_val;
- CORE_ADDR from = dsc->insn_addr;
+ dsc->u.block.regmask = insn1 & 0x00ff;
- if (!insn_references_pc (insn, 0x000ff000ul))
- return copy_unmodified (gdbarch, insn, "ALU immediate", dsc);
+ /* Rewrite instruction: POP {rX, rY, ...,rZ, PC}
+ to :
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn "
- "%.8lx\n", is_mov ? "move" : "ALU",
- (unsigned long) insn);
+ (1) register list is full, that is, r0-r7 are used.
+ Prepare: tmp[0] <- r8
- /* Instruction is of form:
+ POP {r0, r1, ...., r6, r7}; remove PC from reglist
+ MOV r8, r7; Move value of r7 to r8;
+ POP {r7}; Store PC value into r7.
- <op><cond> rd, [rn,] #imm
+ Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0]
- Rewrite as:
+ (2) register list is not full, supposing there are N registers in
+ register list (except PC, 0 <= N <= 7).
+ Prepare: for each i, 0 - N, tmp[i] <- ri.
- Preparation: tmp1, tmp2 <- r0, r1;
- r0, r1 <- rd, rn
- Insn: <op><cond> r0, r1, #imm
- Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
+ POP {r0, r1, ...., rN};
+
+ Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN
+ from tmp[] properly.
*/
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: copying thumb pop {%.8x, pc} insn %.4x\n",
+ dsc->u.block.regmask, insn1);
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- dsc->tmp[1] = displaced_read_reg (regs, from, 1);
- rn_val = displaced_read_reg (regs, from, rn);
- rd_val = displaced_read_reg (regs, from, rd);
- displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
- dsc->rd = rd;
+ if (dsc->u.block.regmask == 0xff)
+ {
+ dsc->tmp[0] = displaced_read_reg (regs, dsc, 8);
- if (is_mov)
- dsc->modinsn[0] = insn & 0xfff00fff;
+ dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */
+ dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */
+ dsc->modinsn[2] = 0xbc80; /* POP {r7} */
+
+ dsc->numinsns = 3;
+ dsc->cleanup = &cleanup_pop_pc_16bit_all;
+ }
else
- dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000;
+ {
+ unsigned int num_in_list = bitcount (dsc->u.block.regmask);
+ unsigned int new_regmask, bit = 1;
+ unsigned int to = 0, from = 0, i, new_rn;
- dsc->cleanup = &cleanup_alu_imm;
+ for (i = 0; i < num_in_list + 1; i++)
+ dsc->tmp[i] = displaced_read_reg (regs, dsc, i);
- return 0;
-}
+ new_regmask = (1 << (num_in_list + 1)) - 1;
-/* Copy/cleanup arithmetic/logic insns with register RHS. */
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, _("displaced: POP "
+ "{..., pc}: original reg list %.4x,"
+ " modified list %.4x\n"),
+ (int) dsc->u.block.regmask, new_regmask);
-static void
-cleanup_alu_reg (struct gdbarch *gdbarch,
- struct regcache *regs, struct displaced_step_closure *dsc)
-{
- ULONGEST rd_val;
- int i;
+ dsc->u.block.regmask |= 0x8000;
+ dsc->u.block.writeback = 0;
+ dsc->u.block.cond = INST_AL;
- rd_val = displaced_read_reg (regs, dsc->insn_addr, 0);
+ dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff);
- for (i = 0; i < 3; i++)
- displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC);
+ dsc->cleanup = &cleanup_block_load_pc;
+ }
- displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+ return 0;
}
-static int
-copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+static void
+thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int rn = bits (insn, 16, 19);
- unsigned int rm = bits (insn, 0, 3);
- unsigned int rd = bits (insn, 12, 15);
- unsigned int op = bits (insn, 21, 24);
- int is_mov = (op == 0xd);
- ULONGEST rd_val, rn_val, rm_val;
- CORE_ADDR from = dsc->insn_addr;
+ unsigned short op_bit_12_15 = bits (insn1, 12, 15);
+ unsigned short op_bit_10_11 = bits (insn1, 10, 11);
+ int err = 0;
- if (!insn_references_pc (insn, 0x000ff00ful))
- return copy_unmodified (gdbarch, insn, "ALU reg", dsc);
+ /* 16-bit thumb instructions. */
+ switch (op_bit_12_15)
+ {
+ /* Shift (imme), add, subtract, move and compare. */
+ case 0: case 1: case 2: case 3:
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1,
+ "shift/add/sub/mov/cmp",
+ dsc);
+ break;
+ case 4:
+ switch (op_bit_10_11)
+ {
+ case 0: /* Data-processing */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1,
+ "data-processing",
+ dsc);
+ break;
+ case 1: /* Special data instructions and branch and exchange. */
+ {
+ unsigned short op = bits (insn1, 7, 9);
+ if (op == 6 || op == 7) /* BX or BLX */
+ err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc);
+ else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */
+ err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc);
+ else
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data",
+ dsc);
+ }
+ break;
+ default: /* LDR (literal) */
+ err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc);
+ }
+ break;
+ case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc);
+ break;
+ case 10:
+ if (op_bit_10_11 < 2) /* Generate PC-relative address */
+ err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc);
+ else /* Generate SP-relative address */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc);
+ break;
+ case 11: /* Misc 16-bit instructions */
+ {
+ switch (bits (insn1, 8, 11))
+ {
+ case 1: case 3: case 9: case 11: /* CBNZ, CBZ */
+ err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc);
+ break;
+ case 12: case 13: /* POP */
+ if (bit (insn1, 8)) /* PC is in register list. */
+ err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc);
+ else
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc);
+ break;
+ case 15: /* If-Then, and hints */
+ if (bits (insn1, 0, 3))
+ /* If-Then makes up to four following instructions conditional.
+ IT instruction itself is not conditional, so handle it as a
+ common unmodified instruction. */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then",
+ dsc);
+ else
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc);
+ break;
+ default:
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc);
+ }
+ }
+ break;
+ case 12:
+ if (op_bit_10_11 < 2) /* Store multiple registers */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc);
+ else /* Load multiple registers */
+ err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc);
+ break;
+ case 13: /* Conditional branch and supervisor call */
+ if (bits (insn1, 9, 11) != 7) /* conditional branch */
+ err = thumb_copy_b (gdbarch, insn1, dsc);
+ else
+ err = thumb_copy_svc (gdbarch, insn1, regs, dsc);
+ break;
+ case 14: /* Unconditional branch */
+ err = thumb_copy_b (gdbarch, insn1, dsc);
+ break;
+ default:
+ err = 1;
+ }
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n",
- is_mov ? "move" : "ALU", (unsigned long) insn);
+ if (err)
+ internal_error (__FILE__, __LINE__,
+ _("thumb_process_displaced_16bit_insn: Instruction decode error"));
+}
- /* Instruction is of form:
+static int
+decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch,
+ uint16_t insn1, uint16_t insn2,
+ struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int rt = bits (insn2, 12, 15);
+ int rn = bits (insn1, 0, 3);
+ int op1 = bits (insn1, 7, 8);
+ int err = 0;
- <op><cond> rd, [rn,] rm [, <shift>]
+ switch (bits (insn1, 5, 6))
+ {
+ case 0: /* Load byte and memory hints */
+ if (rt == 0xf) /* PLD/PLI */
+ {
+ if (rn == 0xf)
+ /* PLD literal or Encoding T3 of PLI(immediate, literal). */
+ return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc);
+ else
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "pli/pld", dsc);
+ }
+ else
+ {
+ if (rn == 0xf) /* LDRB/LDRSB (literal) */
+ return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc,
+ 1);
+ else
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "ldrb{reg, immediate}/ldrbt",
+ dsc);
+ }
- Rewrite as:
+ break;
+ case 1: /* Load halfword and memory hints. */
+ if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "pld/unalloc memhint", dsc);
+ else
+ {
+ if (rn == 0xf)
+ return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc,
+ 2);
+ else
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "ldrh/ldrht", dsc);
+ }
+ break;
+ case 2: /* Load word */
+ {
+ int insn2_bit_8_11 = bits (insn2, 8, 11);
+
+ if (rn == 0xf)
+ return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4);
+ else if (op1 == 0x1) /* Encoding T3 */
+ return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc,
+ 0, 1);
+ else /* op1 == 0x0 */
+ {
+ if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9)
+ /* LDR (immediate) */
+ return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs,
+ dsc, bit (insn2, 8), 1);
+ else if (insn2_bit_8_11 == 0xe) /* LDRT */
+ return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "ldrt", dsc);
+ else
+ /* LDR (register) */
+ return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs,
+ dsc, 0, 0);
+ }
+ break;
+ }
+ default:
+ return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc);
+ break;
+ }
+ return 0;
+}
- Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2;
- r0, r1, r2 <- rd, rn, rm
- Insn: <op><cond> r0, r1, r2 [, <shift>]
- Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3
- */
+static void
+thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1,
+ uint16_t insn2, struct regcache *regs,
+ struct displaced_step_closure *dsc)
+{
+ int err = 0;
+ unsigned short op = bit (insn2, 15);
+ unsigned int op1 = bits (insn1, 11, 12);
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- dsc->tmp[1] = displaced_read_reg (regs, from, 1);
- dsc->tmp[2] = displaced_read_reg (regs, from, 2);
- rd_val = displaced_read_reg (regs, from, rd);
- rn_val = displaced_read_reg (regs, from, rn);
- rm_val = displaced_read_reg (regs, from, rm);
- displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC);
- dsc->rd = rd;
+ switch (op1)
+ {
+ case 1:
+ {
+ switch (bits (insn1, 9, 10))
+ {
+ case 0:
+ if (bit (insn1, 6))
+ {
+ /* Load/store {dual, execlusive}, table branch. */
+ if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1
+ && bits (insn2, 5, 7) == 0)
+ err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs,
+ dsc);
+ else
+ /* PC is not allowed to use in load/store {dual, exclusive}
+ instructions. */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "load/store dual/ex", dsc);
+ }
+ else /* load/store multiple */
+ {
+ switch (bits (insn1, 7, 8))
+ {
+ case 0: case 3: /* SRS, RFE */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "srs/rfe", dsc);
+ break;
+ case 1: case 2: /* LDM/STM/PUSH/POP */
+ err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc);
+ break;
+ }
+ }
+ break;
- if (is_mov)
- dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2;
- else
- dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002;
+ case 1:
+ /* Data-processing (shift register). */
+ err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs,
+ dsc);
+ break;
+ default: /* Coprocessor instructions. */
+ err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc);
+ break;
+ }
+ break;
+ }
+ case 2: /* op1 = 2 */
+ if (op) /* Branch and misc control. */
+ {
+ if (bit (insn2, 14) /* BLX/BL */
+ || bit (insn2, 12) /* Unconditional branch */
+ || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */
+ err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc);
+ else
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "misc ctrl", dsc);
+ }
+ else
+ {
+ if (bit (insn1, 9)) /* Data processing (plain binary imm). */
+ {
+ int op = bits (insn1, 4, 8);
+ int rn = bits (insn1, 0, 3);
+ if ((op == 0 || op == 0xa) && rn == 0xf)
+ err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2,
+ regs, dsc);
+ else
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "dp/pb", dsc);
+ }
+ else /* Data processing (modified immeidate) */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "dp/mi", dsc);
+ }
+ break;
+ case 3: /* op1 = 3 */
+ switch (bits (insn1, 9, 10))
+ {
+ case 0:
+ if (bit (insn1, 4))
+ err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2,
+ regs, dsc);
+ else /* NEON Load/Store and Store single data item */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "neon elt/struct load/store",
+ dsc);
+ break;
+ case 1: /* op1 = 3, bits (9, 10) == 1 */
+ switch (bits (insn1, 7, 8))
+ {
+ case 0: case 1: /* Data processing (register) */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "dp(reg)", dsc);
+ break;
+ case 2: /* Multiply and absolute difference */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "mul/mua/diff", dsc);
+ break;
+ case 3: /* Long multiply and divide */
+ err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2,
+ "lmul/lmua", dsc);
+ break;
+ }
+ break;
+ default: /* Coprocessor instructions */
+ err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc);
+ break;
+ }
+ break;
+ default:
+ err = 1;
+ }
- dsc->cleanup = &cleanup_alu_reg;
+ if (err)
+ internal_error (__FILE__, __LINE__,
+ _("thumb_process_displaced_32bit_insn: Instruction decode error"));
- return 0;
}
-/* Cleanup/copy arithmetic/logic insns with shifted register RHS. */
-
static void
-cleanup_alu_shifted_reg (struct gdbarch *gdbarch,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
+thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
+ CORE_ADDR to, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- ULONGEST rd_val = displaced_read_reg (regs, dsc->insn_addr, 0);
- int i;
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ uint16_t insn1
+ = read_memory_unsigned_integer (from, 2, byte_order_for_code);
- for (i = 0; i < 4; i++)
- displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x "
+ "at %.8lx\n", insn1, (unsigned long) from);
- displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC);
+ dsc->is_thumb = 1;
+ dsc->insn_size = thumb_insn_size (insn1);
+ if (thumb_insn_size (insn1) == 4)
+ {
+ uint16_t insn2
+ = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code);
+ thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc);
+ }
+ else
+ thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc);
}
-static int
-copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+void
+arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
+ CORE_ADDR to, struct regcache *regs,
+ struct displaced_step_closure *dsc)
{
- unsigned int rn = bits (insn, 16, 19);
- unsigned int rm = bits (insn, 0, 3);
- unsigned int rd = bits (insn, 12, 15);
- unsigned int rs = bits (insn, 8, 11);
- unsigned int op = bits (insn, 21, 24);
- int is_mov = (op == 0xd), i;
- ULONGEST rd_val, rn_val, rm_val, rs_val;
- CORE_ADDR from = dsc->insn_addr;
-
- if (!insn_references_pc (insn, 0x000fff0ful))
- return copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc);
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn "
- "%.8lx\n", is_mov ? "move" : "ALU",
- (unsigned long) insn);
+ int err = 0;
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ uint32_t insn;
- /* Instruction is of form:
+ /* Most displaced instructions use a 1-instruction scratch space, so set this
+ here and override below if/when necessary. */
+ dsc->numinsns = 1;
+ dsc->insn_addr = from;
+ dsc->scratch_base = to;
+ dsc->cleanup = NULL;
+ dsc->wrote_to_pc = 0;
- <op><cond> rd, [rn,] rm, <shift> rs
+ if (!displaced_in_arm_mode (regs))
+ return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc);
- Rewrite as:
+ dsc->is_thumb = 0;
+ dsc->insn_size = 4;
+ insn = read_memory_unsigned_integer (from, 4, byte_order_for_code);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx "
+ "at %.8lx\n", (unsigned long) insn,
+ (unsigned long) from);
- Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3
- r0, r1, r2, r3 <- rd, rn, rm, rs
- Insn: <op><cond> r0, r1, r2, <shift> r3
- Cleanup: tmp5 <- r0
- r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4
- rd <- tmp5
- */
+ if ((insn & 0xf0000000) == 0xf0000000)
+ err = arm_decode_unconditional (gdbarch, insn, regs, dsc);
+ else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24))
+ {
+ case 0x0: case 0x1: case 0x2: case 0x3:
+ err = arm_decode_dp_misc (gdbarch, insn, regs, dsc);
+ break;
- for (i = 0; i < 4; i++)
- dsc->tmp[i] = displaced_read_reg (regs, from, i);
+ case 0x4: case 0x5: case 0x6:
+ err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc);
+ break;
- rd_val = displaced_read_reg (regs, from, rd);
- rn_val = displaced_read_reg (regs, from, rn);
- rm_val = displaced_read_reg (regs, from, rm);
- rs_val = displaced_read_reg (regs, from, rs);
- displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC);
- dsc->rd = rd;
+ case 0x7:
+ err = arm_decode_media (gdbarch, insn, dsc);
+ break;
- if (is_mov)
- dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302;
- else
- dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302;
+ case 0x8: case 0x9: case 0xa: case 0xb:
+ err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc);
+ break;
- dsc->cleanup = &cleanup_alu_shifted_reg;
+ case 0xc: case 0xd: case 0xe: case 0xf:
+ err = arm_decode_svc_copro (gdbarch, insn, to, regs, dsc);
+ break;
+ }
- return 0;
+ if (err)
+ internal_error (__FILE__, __LINE__,
+ _("arm_process_displaced_insn: Instruction decode error"));
}
-/* Clean up load instructions. */
+/* Actually set up the scratch space for a displaced instruction. */
-static void
-cleanup_load (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
+void
+arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
+ CORE_ADDR to, struct displaced_step_closure *dsc)
{
- ULONGEST rt_val, rt_val2 = 0, rn_val;
- CORE_ADDR from = dsc->insn_addr;
-
- rt_val = displaced_read_reg (regs, from, 0);
- if (dsc->u.ldst.xfersize == 8)
- rt_val2 = displaced_read_reg (regs, from, 1);
- rn_val = displaced_read_reg (regs, from, 2);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ unsigned int i, len, offset;
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ int size = dsc->is_thumb? 2 : 4;
+ const gdb_byte *bkp_insn;
- displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
- if (dsc->u.ldst.xfersize > 4)
- displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC);
- if (!dsc->u.ldst.immed)
- displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC);
+ offset = 0;
+ /* Poke modified instruction(s). */
+ for (i = 0; i < dsc->numinsns; i++)
+ {
+ if (debug_displaced)
+ {
+ fprintf_unfiltered (gdb_stdlog, "displaced: writing insn ");
+ if (size == 4)
+ fprintf_unfiltered (gdb_stdlog, "%.8lx",
+ dsc->modinsn[i]);
+ else if (size == 2)
+ fprintf_unfiltered (gdb_stdlog, "%.4x",
+ (unsigned short)dsc->modinsn[i]);
- /* Handle register writeback. */
- if (dsc->u.ldst.writeback)
- displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC);
- /* Put result in right place. */
- displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC);
- if (dsc->u.ldst.xfersize == 8)
- displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC);
-}
+ fprintf_unfiltered (gdb_stdlog, " at %.8lx\n",
+ (unsigned long) to + offset);
-/* Clean up store instructions. */
+ }
+ write_memory_unsigned_integer (to + offset, size,
+ byte_order_for_code,
+ dsc->modinsn[i]);
+ offset += size;
+ }
-static void
-cleanup_store (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
-{
- CORE_ADDR from = dsc->insn_addr;
- ULONGEST rn_val = displaced_read_reg (regs, from, 2);
+ /* Choose the correct breakpoint instruction. */
+ if (dsc->is_thumb)
+ {
+ bkp_insn = tdep->thumb_breakpoint;
+ len = tdep->thumb_breakpoint_size;
+ }
+ else
+ {
+ bkp_insn = tdep->arm_breakpoint;
+ len = tdep->arm_breakpoint_size;
+ }
- displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
- if (dsc->u.ldst.xfersize > 4)
- displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC);
- if (!dsc->u.ldst.immed)
- displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC);
- if (!dsc->u.ldst.restore_r4)
- displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC);
+ /* Put breakpoint afterwards. */
+ write_memory (to + offset, bkp_insn, len);
- /* Writeback. */
- if (dsc->u.ldst.writeback)
- displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC);
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ",
+ paddress (gdbarch, from), paddress (gdbarch, to));
}
-/* Copy "extra" load/store instructions. These are halfword/doubleword
- transfers, which have a different encoding to byte/word transfers. */
+/* Entry point for copying an instruction into scratch space for displaced
+ stepping. */
-static int
-copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged,
- struct regcache *regs, struct displaced_step_closure *dsc)
+struct displaced_step_closure *
+arm_displaced_step_copy_insn (struct gdbarch *gdbarch,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs)
{
- unsigned int op1 = bits (insn, 20, 24);
- unsigned int op2 = bits (insn, 5, 6);
- unsigned int rt = bits (insn, 12, 15);
- unsigned int rn = bits (insn, 16, 19);
- unsigned int rm = bits (insn, 0, 3);
- char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1};
- char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2};
- int immed = (op1 & 0x4) != 0;
- int opcode;
- ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0;
- CORE_ADDR from = dsc->insn_addr;
-
- if (!insn_references_pc (insn, 0x000ff00ful))
- return copy_unmodified (gdbarch, insn, "extra load/store", dsc);
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store "
- "insn %.8lx\n", unpriveleged ? "unpriveleged " : "",
- (unsigned long) insn);
-
- opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4;
-
- if (opcode < 0)
- internal_error (__FILE__, __LINE__,
- _("copy_extra_ld_st: instruction decode error"));
-
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- dsc->tmp[1] = displaced_read_reg (regs, from, 1);
- dsc->tmp[2] = displaced_read_reg (regs, from, 2);
- if (!immed)
- dsc->tmp[3] = displaced_read_reg (regs, from, 3);
-
- rt_val = displaced_read_reg (regs, from, rt);
- if (bytesize[opcode] == 8)
- rt_val2 = displaced_read_reg (regs, from, rt + 1);
- rn_val = displaced_read_reg (regs, from, rn);
- if (!immed)
- rm_val = displaced_read_reg (regs, from, rm);
+ struct displaced_step_closure *dsc
+ = xmalloc (sizeof (struct displaced_step_closure));
+ arm_process_displaced_insn (gdbarch, from, to, regs, dsc);
+ arm_displaced_init_closure (gdbarch, from, to, dsc);
- displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC);
- if (bytesize[opcode] == 8)
- displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC);
- if (!immed)
- displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC);
+ return dsc;
+}
- dsc->rd = rt;
- dsc->u.ldst.xfersize = bytesize[opcode];
- dsc->u.ldst.rn = rn;
- dsc->u.ldst.immed = immed;
- dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0;
- dsc->u.ldst.restore_r4 = 0;
+/* Entry point for cleaning things up after a displaced instruction has been
+ single-stepped. */
- if (immed)
- /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm]
- ->
- {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */
- dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000;
- else
- /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm]
- ->
- {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */
- dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003;
+void
+arm_displaced_step_fixup (struct gdbarch *gdbarch,
+ struct displaced_step_closure *dsc,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs)
+{
+ if (dsc->cleanup)
+ dsc->cleanup (gdbarch, regs, dsc);
- dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store;
+ if (!dsc->wrote_to_pc)
+ regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM,
+ dsc->insn_addr + dsc->insn_size);
- return 0;
}
-/* Copy byte/word loads and stores. */
+#include "bfd-in2.h"
+#include "libcoff.h"
static int
-copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs,
- struct displaced_step_closure *dsc, int load, int byte,
- int usermode)
+gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info)
{
- int immed = !bit (insn, 25);
- unsigned int rt = bits (insn, 12, 15);
- unsigned int rn = bits (insn, 16, 19);
- unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */
- ULONGEST rt_val, rn_val, rm_val = 0;
- CORE_ADDR from = dsc->insn_addr;
+ struct gdbarch *gdbarch = info->application_data;
- if (!insn_references_pc (insn, 0x000ff00ful))
- return copy_unmodified (gdbarch, insn, "load/store", dsc);
+ if (arm_pc_is_thumb (gdbarch, memaddr))
+ {
+ static asymbol *asym;
+ static combined_entry_type ce;
+ static struct coff_symbol_struct csym;
+ static struct bfd fake_bfd;
+ static bfd_target fake_target;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying %s%s insn %.8lx\n",
- load ? (byte ? "ldrb" : "ldr")
- : (byte ? "strb" : "str"), usermode ? "t" : "",
- (unsigned long) insn);
+ if (csym.native == NULL)
+ {
+ /* Create a fake symbol vector containing a Thumb symbol.
+ This is solely so that the code in print_insn_little_arm()
+ and print_insn_big_arm() in opcodes/arm-dis.c will detect
+ the presence of a Thumb symbol and switch to decoding
+ Thumb instructions. */
- dsc->tmp[0] = displaced_read_reg (regs, from, 0);
- dsc->tmp[2] = displaced_read_reg (regs, from, 2);
- if (!immed)
- dsc->tmp[3] = displaced_read_reg (regs, from, 3);
- if (!load)
- dsc->tmp[4] = displaced_read_reg (regs, from, 4);
+ fake_target.flavour = bfd_target_coff_flavour;
+ fake_bfd.xvec = &fake_target;
+ ce.u.syment.n_sclass = C_THUMBEXTFUNC;
+ csym.native = &ce;
+ csym.symbol.the_bfd = &fake_bfd;
+ csym.symbol.name = "fake";
+ asym = (asymbol *) & csym;
+ }
- rt_val = displaced_read_reg (regs, from, rt);
- rn_val = displaced_read_reg (regs, from, rn);
- if (!immed)
- rm_val = displaced_read_reg (regs, from, rm);
+ memaddr = UNMAKE_THUMB_ADDR (memaddr);
+ info->symbols = &asym;
+ }
+ else
+ info->symbols = NULL;
- displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC);
- displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC);
- if (!immed)
- displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC);
+ if (info->endian == BFD_ENDIAN_BIG)
+ return print_insn_big_arm (memaddr, info);
+ else
+ return print_insn_little_arm (memaddr, info);
+}
- dsc->rd = rt;
- dsc->u.ldst.xfersize = byte ? 1 : 4;
- dsc->u.ldst.rn = rn;
- dsc->u.ldst.immed = immed;
- dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0;
+/* The following define instruction sequences that will cause ARM
+ cpu's to take an undefined instruction trap. These are used to
+ signal a breakpoint to GDB.
+
+ The newer ARMv4T cpu's are capable of operating in ARM or Thumb
+ modes. A different instruction is required for each mode. The ARM
+ cpu's can also be big or little endian. Thus four different
+ instructions are needed to support all cases.
+
+ Note: ARMv4 defines several new instructions that will take the
+ undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
+ not in fact add the new instructions. The new undefined
+ instructions in ARMv4 are all instructions that had no defined
+ behaviour in earlier chips. There is no guarantee that they will
+ raise an exception, but may be treated as NOP's. In practice, it
+ may only safe to rely on instructions matching:
+
+ 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
+ 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
+
+ Even this may only true if the condition predicate is true. The
+ following use a condition predicate of ALWAYS so it is always TRUE.
+
+ There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
+ and NetBSD all use a software interrupt rather than an undefined
+ instruction to force a trap. This can be handled by by the
+ abi-specific code during establishment of the gdbarch vector. */
- /* To write PC we can do:
+#define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
+#define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
+#define THUMB_LE_BREAKPOINT {0xbe,0xbe}
+#define THUMB_BE_BREAKPOINT {0xbe,0xbe}
- scratch+0: str pc, temp (*temp = scratch + 8 + offset)
- scratch+4: ldr r4, temp
- scratch+8: sub r4, r4, pc (r4 = scratch + 8 + offset - scratch - 8 - 8)
- scratch+12: add r4, r4, #8 (r4 = offset)
- scratch+16: add r0, r0, r4
- scratch+20: str r0, [r2, #imm] (or str r0, [r2, r3])
- scratch+24: <temp>
+static const gdb_byte arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT;
+static const gdb_byte arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT;
+static const gdb_byte arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
+static const gdb_byte arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
- Otherwise we don't know what value to write for PC, since the offset is
- architecture-dependent (sometimes PC+8, sometimes PC+12). */
+/* Determine the type and size of breakpoint to insert at PCPTR. Uses
+ the program counter value to determine whether a 16-bit or 32-bit
+ breakpoint should be used. It returns a pointer to a string of
+ bytes that encode a breakpoint instruction, stores the length of
+ the string to *lenptr, and adjusts the program counter (if
+ necessary) to point to the actual memory location where the
+ breakpoint should be inserted. */
+
+static const unsigned char *
+arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- if (load || rt != 15)
+ if (arm_pc_is_thumb (gdbarch, *pcptr))
{
- dsc->u.ldst.restore_r4 = 0;
+ *pcptr = UNMAKE_THUMB_ADDR (*pcptr);
- if (immed)
- /* {ldr,str}[b]<cond> rt, [rn, #imm], etc.
- ->
- {ldr,str}[b]<cond> r0, [r2, #imm]. */
- dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000;
- else
- /* {ldr,str}[b]<cond> rt, [rn, rm], etc.
- ->
- {ldr,str}[b]<cond> r0, [r2, r3]. */
- dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003;
+ /* If we have a separate 32-bit breakpoint instruction for Thumb-2,
+ check whether we are replacing a 32-bit instruction. */
+ if (tdep->thumb2_breakpoint != NULL)
+ {
+ gdb_byte buf[2];
+ if (target_read_memory (*pcptr, buf, 2) == 0)
+ {
+ unsigned short inst1;
+ inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code);
+ if (thumb_insn_size (inst1) == 4)
+ {
+ *lenptr = tdep->thumb2_breakpoint_size;
+ return tdep->thumb2_breakpoint;
+ }
+ }
+ }
+
+ *lenptr = tdep->thumb_breakpoint_size;
+ return tdep->thumb_breakpoint;
}
else
{
- /* We need to use r4 as scratch. Make sure it's restored afterwards. */
- dsc->u.ldst.restore_r4 = 1;
-
- dsc->modinsn[0] = 0xe58ff014; /* str pc, [pc, #20]. */
- dsc->modinsn[1] = 0xe59f4010; /* ldr r4, [pc, #16]. */
- dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */
- dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */
- dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */
+ *lenptr = tdep->arm_breakpoint_size;
+ return tdep->arm_breakpoint;
+ }
+}
- /* As above. */
- if (immed)
- dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000;
- else
- dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003;
+static void
+arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
+ int *kindptr)
+{
+ arm_breakpoint_from_pc (gdbarch, pcptr, kindptr);
- dsc->modinsn[6] = 0x0; /* breakpoint location. */
- dsc->modinsn[7] = 0x0; /* scratch space. */
+ if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4)
+ /* The documented magic value for a 32-bit Thumb-2 breakpoint, so
+ that this is not confused with a 32-bit ARM breakpoint. */
+ *kindptr = 3;
+}
- dsc->numinsns = 6;
- }
+/* Extract from an array REGBUF containing the (raw) register state a
+ function return value of type TYPE, and copy that, in virtual
+ format, into VALBUF. */
- dsc->cleanup = load ? &cleanup_load : &cleanup_store;
+static void
+arm_extract_return_value (struct type *type, struct regcache *regs,
+ gdb_byte *valbuf)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regs);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- return 0;
-}
+ if (TYPE_CODE_FLT == TYPE_CODE (type))
+ {
+ switch (gdbarch_tdep (gdbarch)->fp_model)
+ {
+ case ARM_FLOAT_FPA:
+ {
+ /* The value is in register F0 in internal format. We need to
+ extract the raw value and then convert it to the desired
+ internal type. */
+ bfd_byte tmpbuf[FP_REGISTER_SIZE];
-/* Cleanup LDM instructions with fully-populated register list. This is an
- unfortunate corner case: it's impossible to implement correctly by modifying
- the instruction. The issue is as follows: we have an instruction,
+ regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf);
+ convert_from_extended (floatformat_from_type (type), tmpbuf,
+ valbuf, gdbarch_byte_order (gdbarch));
+ }
+ break;
- ldm rN, {r0-r15}
+ case ARM_FLOAT_SOFT_FPA:
+ case ARM_FLOAT_SOFT_VFP:
+ /* ARM_FLOAT_VFP can arise if this is a variadic function so
+ not using the VFP ABI code. */
+ case ARM_FLOAT_VFP:
+ regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf);
+ if (TYPE_LENGTH (type) > 4)
+ regcache_cooked_read (regs, ARM_A1_REGNUM + 1,
+ valbuf + INT_REGISTER_SIZE);
+ break;
- which we must rewrite to avoid loading PC. A possible solution would be to
- do the load in two halves, something like (with suitable cleanup
- afterwards):
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("arm_extract_return_value: "
+ "Floating point model not supported"));
+ break;
+ }
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_INT
+ || TYPE_CODE (type) == TYPE_CODE_CHAR
+ || TYPE_CODE (type) == TYPE_CODE_BOOL
+ || TYPE_CODE (type) == TYPE_CODE_PTR
+ || TYPE_CODE (type) == TYPE_CODE_REF
+ || TYPE_CODE (type) == TYPE_CODE_ENUM)
+ {
+ /* If the type is a plain integer, then the access is
+ straight-forward. Otherwise we have to play around a bit
+ more. */
+ int len = TYPE_LENGTH (type);
+ int regno = ARM_A1_REGNUM;
+ ULONGEST tmp;
- mov r8, rN
- ldm[id][ab] r8!, {r0-r7}
- str r7, <temp>
- ldm[id][ab] r8, {r7-r14}
- <bkpt>
+ while (len > 0)
+ {
+ /* By using store_unsigned_integer we avoid having to do
+ anything special for small big-endian values. */
+ regcache_cooked_read_unsigned (regs, regno++, &tmp);
+ store_unsigned_integer (valbuf,
+ (len > INT_REGISTER_SIZE
+ ? INT_REGISTER_SIZE : len),
+ byte_order, tmp);
+ len -= INT_REGISTER_SIZE;
+ valbuf += INT_REGISTER_SIZE;
+ }
+ }
+ else
+ {
+ /* For a structure or union the behaviour is as if the value had
+ been stored to word-aligned memory and then loaded into
+ registers with 32-bit load instruction(s). */
+ int len = TYPE_LENGTH (type);
+ int regno = ARM_A1_REGNUM;
+ bfd_byte tmpbuf[INT_REGISTER_SIZE];
- but at present there's no suitable place for <temp>, since the scratch space
- is overwritten before the cleanup routine is called. For now, we simply
- emulate the instruction. */
+ while (len > 0)
+ {
+ regcache_cooked_read (regs, regno++, tmpbuf);
+ memcpy (valbuf, tmpbuf,
+ len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len);
+ len -= INT_REGISTER_SIZE;
+ valbuf += INT_REGISTER_SIZE;
+ }
+ }
+}
-static void
-cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
+
+/* Will a function return an aggregate type in memory or in a
+ register? Return 0 if an aggregate type can be returned in a
+ register, 1 if it must be returned in memory. */
+
+static int
+arm_return_in_memory (struct gdbarch *gdbarch, struct type *type)
{
- ULONGEST from = dsc->insn_addr;
- int inc = dsc->u.block.increment;
- int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0;
- int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4);
- uint32_t regmask = dsc->u.block.regmask;
- int regno = inc ? 0 : 15;
- CORE_ADDR xfer_addr = dsc->u.block.xfer_addr;
- int exception_return = dsc->u.block.load && dsc->u.block.user
- && (regmask & 0x8000) != 0;
- uint32_t status = displaced_read_reg (regs, from, ARM_PS_REGNUM);
- int do_transfer = condition_true (dsc->u.block.cond, status);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int nRc;
+ enum type_code code;
- if (!do_transfer)
- return;
+ CHECK_TYPEDEF (type);
- /* If the instruction is ldm rN, {...pc}^, I don't think there's anything
- sensible we can do here. Complain loudly. */
- if (exception_return)
- error (_("Cannot single-step exception return"));
+ /* In the ARM ABI, "integer" like aggregate types are returned in
+ registers. For an aggregate type to be integer like, its size
+ must be less than or equal to INT_REGISTER_SIZE and the
+ offset of each addressable subfield must be zero. Note that bit
+ fields are not addressable, and all addressable subfields of
+ unions always start at offset zero.
- /* We don't handle any stores here for now. */
- gdb_assert (dsc->u.block.load != 0);
+ This function is based on the behaviour of GCC 2.95.1.
+ See: gcc/arm.c: arm_return_in_memory() for details.
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: "
- "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm",
- dsc->u.block.increment ? "inc" : "dec",
- dsc->u.block.before ? "before" : "after");
+ Note: All versions of GCC before GCC 2.95.2 do not set up the
+ parameters correctly for a function returning the following
+ structure: struct { float f;}; This should be returned in memory,
+ not a register. Richard Earnshaw sent me a patch, but I do not
+ know of any way to detect if a function like the above has been
+ compiled with the correct calling convention. */
- while (regmask)
+ /* All aggregate types that won't fit in a register must be returned
+ in memory. */
+ if (TYPE_LENGTH (type) > INT_REGISTER_SIZE)
{
- uint32_t memword;
+ return 1;
+ }
- if (inc)
- while (regno <= 15 && (regmask & (1 << regno)) == 0)
- regno++;
- else
- while (regno >= 0 && (regmask & (1 << regno)) == 0)
- regno--;
+ /* The AAPCS says all aggregates not larger than a word are returned
+ in a register. */
+ if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS)
+ return 0;
- xfer_addr += bump_before;
+ /* The only aggregate types that can be returned in a register are
+ structs and unions. Arrays must be returned in memory. */
+ code = TYPE_CODE (type);
+ if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code))
+ {
+ return 1;
+ }
- memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order);
- displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC);
+ /* Assume all other aggregate types can be returned in a register.
+ Run a check for structures, unions and arrays. */
+ nRc = 0;
- xfer_addr += bump_after;
+ if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code))
+ {
+ int i;
+ /* Need to check if this struct/union is "integer" like. For
+ this to be true, its size must be less than or equal to
+ INT_REGISTER_SIZE and the offset of each addressable
+ subfield must be zero. Note that bit fields are not
+ addressable, and unions always start at offset zero. If any
+ of the subfields is a floating point type, the struct/union
+ cannot be an integer type. */
- regmask &= ~(1 << regno);
+ /* For each field in the object, check:
+ 1) Is it FP? --> yes, nRc = 1;
+ 2) Is it addressable (bitpos != 0) and
+ not packed (bitsize == 0)?
+ --> yes, nRc = 1
+ */
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ enum type_code field_type_code;
+ field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type,
+ i)));
+
+ /* Is it a floating point type field? */
+ if (field_type_code == TYPE_CODE_FLT)
+ {
+ nRc = 1;
+ break;
+ }
+
+ /* If bitpos != 0, then we have to care about it. */
+ if (TYPE_FIELD_BITPOS (type, i) != 0)
+ {
+ /* Bitfields are not addressable. If the field bitsize is
+ zero, then the field is not packed. Hence it cannot be
+ a bitfield or any other packed type. */
+ if (TYPE_FIELD_BITSIZE (type, i) == 0)
+ {
+ nRc = 1;
+ break;
+ }
+ }
+ }
}
- if (dsc->u.block.writeback)
- displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr,
- CANNOT_WRITE_PC);
+ return nRc;
}
-/* Clean up an STM which included the PC in the register list. */
+/* Write into appropriate registers a function return value of type
+ TYPE, given in virtual format. */
static void
-cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
+arm_store_return_value (struct type *type, struct regcache *regs,
+ const gdb_byte *valbuf)
{
- ULONGEST from = dsc->insn_addr;
- uint32_t status = displaced_read_reg (regs, from, ARM_PS_REGNUM);
- int store_executed = condition_true (dsc->u.block.cond, status);
- CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask);
- CORE_ADDR stm_insn_addr;
- uint32_t pc_val;
- long offset;
+ struct gdbarch *gdbarch = get_regcache_arch (regs);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- /* If condition code fails, there's nothing else to do. */
- if (!store_executed)
- return;
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ gdb_byte buf[MAX_REGISTER_SIZE];
- if (dsc->u.block.increment)
+ switch (gdbarch_tdep (gdbarch)->fp_model)
+ {
+ case ARM_FLOAT_FPA:
+
+ convert_to_extended (floatformat_from_type (type), buf, valbuf,
+ gdbarch_byte_order (gdbarch));
+ regcache_cooked_write (regs, ARM_F0_REGNUM, buf);
+ break;
+
+ case ARM_FLOAT_SOFT_FPA:
+ case ARM_FLOAT_SOFT_VFP:
+ /* ARM_FLOAT_VFP can arise if this is a variadic function so
+ not using the VFP ABI code. */
+ case ARM_FLOAT_VFP:
+ regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf);
+ if (TYPE_LENGTH (type) > 4)
+ regcache_cooked_write (regs, ARM_A1_REGNUM + 1,
+ valbuf + INT_REGISTER_SIZE);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("arm_store_return_value: Floating "
+ "point model not supported"));
+ break;
+ }
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_INT
+ || TYPE_CODE (type) == TYPE_CODE_CHAR
+ || TYPE_CODE (type) == TYPE_CODE_BOOL
+ || TYPE_CODE (type) == TYPE_CODE_PTR
+ || TYPE_CODE (type) == TYPE_CODE_REF
+ || TYPE_CODE (type) == TYPE_CODE_ENUM)
{
- pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs;
+ if (TYPE_LENGTH (type) <= 4)
+ {
+ /* Values of one word or less are zero/sign-extended and
+ returned in r0. */
+ bfd_byte tmpbuf[INT_REGISTER_SIZE];
+ LONGEST val = unpack_long (type, valbuf);
- if (dsc->u.block.before)
- pc_stored_at += 4;
+ store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val);
+ regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf);
+ }
+ else
+ {
+ /* Integral values greater than one word are stored in consecutive
+ registers starting with r0. This will always be a multiple of
+ the regiser size. */
+ int len = TYPE_LENGTH (type);
+ int regno = ARM_A1_REGNUM;
+
+ while (len > 0)
+ {
+ regcache_cooked_write (regs, regno++, valbuf);
+ len -= INT_REGISTER_SIZE;
+ valbuf += INT_REGISTER_SIZE;
+ }
+ }
}
else
{
- pc_stored_at = dsc->u.block.xfer_addr;
+ /* For a structure or union the behaviour is as if the value had
+ been stored to word-aligned memory and then loaded into
+ registers with 32-bit load instruction(s). */
+ int len = TYPE_LENGTH (type);
+ int regno = ARM_A1_REGNUM;
+ bfd_byte tmpbuf[INT_REGISTER_SIZE];
- if (dsc->u.block.before)
- pc_stored_at -= 4;
+ while (len > 0)
+ {
+ memcpy (tmpbuf, valbuf,
+ len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len);
+ regcache_cooked_write (regs, regno++, tmpbuf);
+ len -= INT_REGISTER_SIZE;
+ valbuf += INT_REGISTER_SIZE;
+ }
}
-
- pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order);
- stm_insn_addr = dsc->scratch_base;
- offset = pc_val - stm_insn_addr;
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for "
- "STM instruction\n", offset);
-
- /* Rewrite the stored PC to the proper value for the non-displaced original
- instruction. */
- write_memory_unsigned_integer (pc_stored_at, 4, byte_order,
- dsc->insn_addr + offset);
}
-/* Clean up an LDM which includes the PC in the register list. We clumped all
- the registers in the transferred list into a contiguous range r0...rX (to
- avoid loading PC directly and losing control of the debugged program), so we
- must undo that here. */
-
-static void
-cleanup_block_load_pc (struct gdbarch *gdbarch,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
-{
- ULONGEST from = dsc->insn_addr;
- uint32_t status = displaced_read_reg (regs, from, ARM_PS_REGNUM);
- int load_executed = condition_true (dsc->u.block.cond, status), i;
- unsigned int mask = dsc->u.block.regmask, write_reg = 15;
- unsigned int regs_loaded = bitcount (mask);
- unsigned int num_to_shuffle = regs_loaded, clobbered;
-
- /* The method employed here will fail if the register list is fully populated
- (we need to avoid loading PC directly). */
- gdb_assert (num_to_shuffle < 16);
- if (!load_executed)
- return;
+/* Handle function return values. */
- clobbered = (1 << num_to_shuffle) - 1;
+static enum return_value_convention
+arm_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *valtype, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ struct type *func_type = function ? value_type (function) : NULL;
+ enum arm_vfp_cprc_base_type vfp_base_type;
+ int vfp_base_count;
- while (num_to_shuffle > 0)
+ if (arm_vfp_abi_for_function (gdbarch, func_type)
+ && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count))
{
- if ((mask & (1 << write_reg)) != 0)
+ int reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
+ int unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
+ int i;
+ for (i = 0; i < vfp_base_count; i++)
{
- unsigned int read_reg = num_to_shuffle - 1;
-
- if (read_reg != write_reg)
+ if (reg_char == 'q')
{
- ULONGEST rval = displaced_read_reg (regs, from, read_reg);
- displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move "
- "loaded register r%d to r%d\n"), read_reg,
- write_reg);
- }
- else if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register "
- "r%d already in the right place\n"),
- write_reg);
+ if (writebuf)
+ arm_neon_quad_write (gdbarch, regcache, i,
+ writebuf + i * unit_length);
- clobbered &= ~(1 << write_reg);
+ if (readbuf)
+ arm_neon_quad_read (gdbarch, regcache, i,
+ readbuf + i * unit_length);
+ }
+ else
+ {
+ char name_buf[4];
+ int regnum;
- num_to_shuffle--;
+ xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i);
+ regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
+ if (writebuf)
+ regcache_cooked_write (regcache, regnum,
+ writebuf + i * unit_length);
+ if (readbuf)
+ regcache_cooked_read (regcache, regnum,
+ readbuf + i * unit_length);
+ }
}
-
- write_reg--;
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
- /* Restore any registers we scribbled over. */
- for (write_reg = 0; clobbered != 0; write_reg++)
+ if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
+ || TYPE_CODE (valtype) == TYPE_CODE_UNION
+ || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
{
- if ((clobbered & (1 << write_reg)) != 0)
- {
- displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg],
- CANNOT_WRITE_PC);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored "
- "clobbered register r%d\n"), write_reg);
- clobbered &= ~(1 << write_reg);
- }
+ if (tdep->struct_return == pcc_struct_return
+ || arm_return_in_memory (gdbarch, valtype))
+ return RETURN_VALUE_STRUCT_CONVENTION;
}
- /* Perform register writeback manually. */
- if (dsc->u.block.writeback)
- {
- ULONGEST new_rn_val = dsc->u.block.xfer_addr;
+ /* AAPCS returns complex types longer than a register in memory. */
+ if (tdep->arm_abi != ARM_ABI_APCS
+ && TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
+ && TYPE_LENGTH (valtype) > INT_REGISTER_SIZE)
+ return RETURN_VALUE_STRUCT_CONVENTION;
- if (dsc->u.block.increment)
- new_rn_val += regs_loaded * 4;
- else
- new_rn_val -= regs_loaded * 4;
+ if (writebuf)
+ arm_store_return_value (valtype, regcache, writebuf);
- displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val,
- CANNOT_WRITE_PC);
- }
+ if (readbuf)
+ arm_extract_return_value (valtype, regcache, readbuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
-/* Handle ldm/stm, apart from some tricky cases which are unlikely to occur
- in user-level code (in particular exception return, ldm rn, {...pc}^). */
static int
-copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
- int load = bit (insn, 20);
- int user = bit (insn, 22);
- int increment = bit (insn, 23);
- int before = bit (insn, 24);
- int writeback = bit (insn, 21);
- int rn = bits (insn, 16, 19);
- CORE_ADDR from = dsc->insn_addr;
-
- /* Block transfers which don't mention PC can be run directly out-of-line. */
- if (rn != 15 && (insn & 0x8000) == 0)
- return copy_unmodified (gdbarch, insn, "ldm/stm", dsc);
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR jb_addr;
+ gdb_byte buf[INT_REGISTER_SIZE];
+
+ jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM);
- if (rn == 15)
- {
- warning (_("displaced: Unpredictable LDM or STM with base register r15"));
- return copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc);
- }
+ if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf,
+ INT_REGISTER_SIZE))
+ return 0;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn "
- "%.8lx\n", (unsigned long) insn);
+ *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order);
+ return 1;
+}
- dsc->u.block.xfer_addr = displaced_read_reg (regs, from, rn);
- dsc->u.block.rn = rn;
+/* Recognize GCC and GNU ld's trampolines. If we are in a trampoline,
+ return the target PC. Otherwise return 0. */
- dsc->u.block.load = load;
- dsc->u.block.user = user;
- dsc->u.block.increment = increment;
- dsc->u.block.before = before;
- dsc->u.block.writeback = writeback;
- dsc->u.block.cond = bits (insn, 28, 31);
+CORE_ADDR
+arm_skip_stub (struct frame_info *frame, CORE_ADDR pc)
+{
+ const char *name;
+ int namelen;
+ CORE_ADDR start_addr;
- dsc->u.block.regmask = insn & 0xffff;
+ /* Find the starting address and name of the function containing the PC. */
+ if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0)
+ return 0;
- if (load)
+ /* If PC is in a Thumb call or return stub, return the address of the
+ target PC, which is in a register. The thunk functions are called
+ _call_via_xx, where x is the register name. The possible names
+ are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar
+ functions, named __ARM_call_via_r[0-7]. */
+ if (strncmp (name, "_call_via_", 10) == 0
+ || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0)
{
- if ((insn & 0xffff) == 0xffff)
- {
- /* LDM with a fully-populated register list. This case is
- particularly tricky. Implement for now by fully emulating the
- instruction (which might not behave perfectly in all cases, but
- these instructions should be rare enough for that not to matter
- too much). */
- dsc->modinsn[0] = ARM_NOP;
-
- dsc->cleanup = &cleanup_block_load_all;
- }
- else
- {
- /* LDM of a list of registers which includes PC. Implement by
- rewriting the list of registers to be transferred into a
- contiguous chunk r0...rX before doing the transfer, then shuffling
- registers into the correct places in the cleanup routine. */
- unsigned int regmask = insn & 0xffff;
- unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1;
- unsigned int to = 0, from = 0, i, new_rn;
-
- for (i = 0; i < num_in_list; i++)
- dsc->tmp[i] = displaced_read_reg (regs, from, i);
-
- /* Writeback makes things complicated. We need to avoid clobbering
- the base register with one of the registers in our modified
- register list, but just using a different register can't work in
- all cases, e.g.:
-
- ldm r14!, {r0-r13,pc}
-
- which would need to be rewritten as:
-
- ldm rN!, {r0-r14}
-
- but that can't work, because there's no free register for N.
-
- Solve this by turning off the writeback bit, and emulating
- writeback manually in the cleanup routine. */
+ /* Use the name suffix to determine which register contains the
+ target PC. */
+ static char *table[15] =
+ {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "sl", "fp", "ip", "sp", "lr"
+ };
+ int regno;
+ int offset = strlen (name) - 2;
- if (writeback)
- insn &= ~(1 << 21);
+ for (regno = 0; regno <= 14; regno++)
+ if (strcmp (&name[offset], table[regno]) == 0)
+ return get_frame_register_unsigned (frame, regno);
+ }
- new_regmask = (1 << num_in_list) - 1;
+ /* GNU ld generates __foo_from_arm or __foo_from_thumb for
+ non-interworking calls to foo. We could decode the stubs
+ to find the target but it's easier to use the symbol table. */
+ namelen = strlen (name);
+ if (name[0] == '_' && name[1] == '_'
+ && ((namelen > 2 + strlen ("_from_thumb")
+ && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb",
+ strlen ("_from_thumb")) == 0)
+ || (namelen > 2 + strlen ("_from_arm")
+ && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm",
+ strlen ("_from_arm")) == 0)))
+ {
+ char *target_name;
+ int target_len = namelen - 2;
+ struct minimal_symbol *minsym;
+ struct objfile *objfile;
+ struct obj_section *sec;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, "
- "{..., pc}: original reg list %.4x, modified "
- "list %.4x\n"), rn, writeback ? "!" : "",
- (int) insn & 0xffff, new_regmask);
+ if (name[namelen - 1] == 'b')
+ target_len -= strlen ("_from_thumb");
+ else
+ target_len -= strlen ("_from_arm");
- dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff);
+ target_name = alloca (target_len + 1);
+ memcpy (target_name, name + 2, target_len);
+ target_name[target_len] = '\0';
- dsc->cleanup = &cleanup_block_load_pc;
- }
+ sec = find_pc_section (pc);
+ objfile = (sec == NULL) ? NULL : sec->objfile;
+ minsym = lookup_minimal_symbol (target_name, NULL, objfile);
+ if (minsym != NULL)
+ return SYMBOL_VALUE_ADDRESS (minsym);
+ else
+ return 0;
}
- else
- {
- /* STM of a list of registers which includes PC. Run the instruction
- as-is, but out of line: this will store the wrong value for the PC,
- so we must manually fix up the memory in the cleanup routine.
- Doing things this way has the advantage that we can auto-detect
- the offset of the PC write (which is architecture-dependent) in
- the cleanup routine. */
- dsc->modinsn[0] = insn;
- dsc->cleanup = &cleanup_block_store_pc;
- }
+ return 0; /* not a stub */
+}
- return 0;
+static void
+set_arm_command (char *args, int from_tty)
+{
+ printf_unfiltered (_("\
+\"set arm\" must be followed by an apporpriate subcommand.\n"));
+ help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout);
+}
+
+static void
+show_arm_command (char *args, int from_tty)
+{
+ cmd_show_list (showarmcmdlist, from_tty, "");
}
-/* Cleanup/copy SVC (SWI) instructions. These two functions are overridden
- for Linux, where some SVC instructions must be treated specially. */
-
static void
-cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs,
- struct displaced_step_closure *dsc)
+arm_update_current_architecture (void)
{
- CORE_ADDR from = dsc->insn_addr;
- CORE_ADDR resume_addr = from + 4;
+ struct gdbarch_info info;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at "
- "%.8lx\n", (unsigned long) resume_addr);
+ /* If the current architecture is not ARM, we have nothing to do. */
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm)
+ return;
- displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC);
+ /* Update the architecture. */
+ gdbarch_info_init (&info);
+
+ if (!gdbarch_update_p (info))
+ internal_error (__FILE__, __LINE__, _("could not update architecture"));
}
-static int
-copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
- struct regcache *regs, struct displaced_step_closure *dsc)
+static void
+set_fp_model_sfunc (char *args, int from_tty,
+ struct cmd_list_element *c)
{
- CORE_ADDR from = dsc->insn_addr;
-
- /* Allow OS-specific code to override SVC handling. */
- if (dsc->u.svc.copy_svc_os)
- return dsc->u.svc.copy_svc_os (gdbarch, insn, to, regs, dsc);
+ enum arm_float_model fp_model;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n",
- (unsigned long) insn);
+ for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++)
+ if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0)
+ {
+ arm_fp_model = fp_model;
+ break;
+ }
- /* Preparation: none.
- Insn: unmodified svc.
- Cleanup: pc <- insn_addr + 4. */
+ if (fp_model == ARM_FLOAT_LAST)
+ internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."),
+ current_fp_model);
- dsc->modinsn[0] = insn;
+ arm_update_current_architecture ();
+}
- dsc->cleanup = &cleanup_svc;
- /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
- instruction. */
- dsc->wrote_to_pc = 1;
+static void
+show_fp_model (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
- return 0;
+ if (arm_fp_model == ARM_FLOAT_AUTO
+ && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm)
+ fprintf_filtered (file, _("\
+The current ARM floating point model is \"auto\" (currently \"%s\").\n"),
+ fp_model_strings[tdep->fp_model]);
+ else
+ fprintf_filtered (file, _("\
+The current ARM floating point model is \"%s\".\n"),
+ fp_model_strings[arm_fp_model]);
}
-/* Copy undefined instructions. */
-
-static int
-copy_undef (struct gdbarch *gdbarch, uint32_t insn,
- struct displaced_step_closure *dsc)
+static void
+arm_set_abi (char *args, int from_tty,
+ struct cmd_list_element *c)
{
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn %.8lx\n",
- (unsigned long) insn);
+ enum arm_abi_kind arm_abi;
- dsc->modinsn[0] = insn;
+ for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++)
+ if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0)
+ {
+ arm_abi_global = arm_abi;
+ break;
+ }
- return 0;
+ if (arm_abi == ARM_ABI_LAST)
+ internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."),
+ arm_abi_string);
+
+ arm_update_current_architecture ();
}
-/* Copy unpredictable instructions. */
+static void
+arm_show_abi (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
-static int
-copy_unpred (struct gdbarch *gdbarch, uint32_t insn,
- struct displaced_step_closure *dsc)
+ if (arm_abi_global == ARM_ABI_AUTO
+ && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm)
+ fprintf_filtered (file, _("\
+The current ARM ABI is \"auto\" (currently \"%s\").\n"),
+ arm_abi_strings[tdep->arm_abi]);
+ else
+ fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"),
+ arm_abi_string);
+}
+
+static void
+arm_show_fallback_mode (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
{
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn "
- "%.8lx\n", (unsigned long) insn);
+ fprintf_filtered (file,
+ _("The current execution mode assumed "
+ "(when symbols are unavailable) is \"%s\".\n"),
+ arm_fallback_mode_string);
+}
- dsc->modinsn[0] = insn;
+static void
+arm_show_force_mode (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
- return 0;
+ fprintf_filtered (file,
+ _("The current execution mode assumed "
+ "(even when symbols are available) is \"%s\".\n"),
+ arm_force_mode_string);
}
-/* The decode_* functions are instruction decoding helpers. They mostly follow
- the presentation in the ARM ARM. */
+/* If the user changes the register disassembly style used for info
+ register and other commands, we have to also switch the style used
+ in opcodes for disassembly output. This function is run in the "set
+ arm disassembly" command, and does that. */
-static int
-decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
+static void
+set_disassembly_style_sfunc (char *args, int from_tty,
+ struct cmd_list_element *c)
{
- unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7);
- unsigned int rn = bits (insn, 16, 19);
+ set_disassembly_style ();
+}
+\f
+/* Return the ARM register name corresponding to register I. */
+static const char *
+arm_register_name (struct gdbarch *gdbarch, int i)
+{
+ const int num_regs = gdbarch_num_regs (gdbarch);
- if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0)
- return copy_unmodified (gdbarch, insn, "cps", dsc);
- else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1)
- return copy_unmodified (gdbarch, insn, "setend", dsc);
- else if ((op1 & 0x60) == 0x20)
- return copy_unmodified (gdbarch, insn, "neon dataproc", dsc);
- else if ((op1 & 0x71) == 0x40)
- return copy_unmodified (gdbarch, insn, "neon elt/struct load/store", dsc);
- else if ((op1 & 0x77) == 0x41)
- return copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc);
- else if ((op1 & 0x77) == 0x45)
- return copy_preload (gdbarch, insn, regs, dsc); /* pli. */
- else if ((op1 & 0x77) == 0x51)
+ if (gdbarch_tdep (gdbarch)->have_vfp_pseudos
+ && i >= num_regs && i < num_regs + 32)
{
- if (rn != 0xf)
- return copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */
- else
- return copy_unpred (gdbarch, insn, dsc);
+ static const char *const vfp_pseudo_names[] = {
+ "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
+ "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
+ "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
+ "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
+ };
+
+ return vfp_pseudo_names[i - num_regs];
}
- else if ((op1 & 0x77) == 0x55)
- return copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */
- else if (op1 == 0x57)
- switch (op2)
- {
- case 0x1: return copy_unmodified (gdbarch, insn, "clrex", dsc);
- case 0x4: return copy_unmodified (gdbarch, insn, "dsb", dsc);
- case 0x5: return copy_unmodified (gdbarch, insn, "dmb", dsc);
- case 0x6: return copy_unmodified (gdbarch, insn, "isb", dsc);
- default: return copy_unpred (gdbarch, insn, dsc);
- }
- else if ((op1 & 0x63) == 0x43)
- return copy_unpred (gdbarch, insn, dsc);
- else if ((op2 & 0x1) == 0x0)
- switch (op1 & ~0x80)
- {
- case 0x61:
- return copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc);
- case 0x65:
- return copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */
- case 0x71: case 0x75:
- /* pld/pldw reg. */
- return copy_preload_reg (gdbarch, insn, regs, dsc);
- case 0x63: case 0x67: case 0x73: case 0x77:
- return copy_unpred (gdbarch, insn, dsc);
- default:
- return copy_undef (gdbarch, insn, dsc);
- }
- else
- return copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */
+
+ if (gdbarch_tdep (gdbarch)->have_neon_pseudos
+ && i >= num_regs + 32 && i < num_regs + 32 + 16)
+ {
+ static const char *const neon_pseudo_names[] = {
+ "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7",
+ "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15",
+ };
+
+ return neon_pseudo_names[i - num_regs - 32];
+ }
+
+ if (i >= ARRAY_SIZE (arm_register_names))
+ /* These registers are only supported on targets which supply
+ an XML description. */
+ return "";
+
+ return arm_register_names[i];
}
-static int
-decode_unconditional (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+static void
+set_disassembly_style (void)
{
- if (bit (insn, 27) == 0)
- return decode_misc_memhint_neon (gdbarch, insn, regs, dsc);
- /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */
- else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20))
- {
- case 0x0: case 0x2:
- return copy_unmodified (gdbarch, insn, "srs", dsc);
+ int current;
- case 0x1: case 0x3:
- return copy_unmodified (gdbarch, insn, "rfe", dsc);
+ /* Find the style that the user wants. */
+ for (current = 0; current < num_disassembly_options; current++)
+ if (disassembly_style == valid_disassembly_styles[current])
+ break;
+ gdb_assert (current < num_disassembly_options);
- case 0x4: case 0x5: case 0x6: case 0x7:
- return copy_b_bl_blx (gdbarch, insn, regs, dsc);
+ /* Synchronize the disassembler. */
+ set_arm_regname_option (current);
+}
- case 0x8:
- switch ((insn & 0xe00000) >> 21)
- {
- case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7:
- /* stc/stc2. */
- return copy_copro_load_store (gdbarch, insn, regs, dsc);
+/* Test whether the coff symbol specific value corresponds to a Thumb
+ function. */
- case 0x2:
- return copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc);
+static int
+coff_sym_is_thumb (int val)
+{
+ return (val == C_THUMBEXT
+ || val == C_THUMBSTAT
+ || val == C_THUMBEXTFUNC
+ || val == C_THUMBSTATFUNC
+ || val == C_THUMBLABEL);
+}
- default:
- return copy_undef (gdbarch, insn, dsc);
- }
+/* arm_coff_make_msymbol_special()
+ arm_elf_make_msymbol_special()
+
+ These functions test whether the COFF or ELF symbol corresponds to
+ an address in thumb code, and set a "special" bit in a minimal
+ symbol to indicate that it does. */
+
+static void
+arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym)
+{
+ if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym)
+ == ST_BRANCH_TO_THUMB)
+ MSYMBOL_SET_SPECIAL (msym);
+}
- case 0x9:
- {
- int rn_f = (bits (insn, 16, 19) == 0xf);
- switch ((insn & 0xe00000) >> 21)
- {
- case 0x1: case 0x3:
- /* ldc/ldc2 imm (undefined for rn == pc). */
- return rn_f ? copy_undef (gdbarch, insn, dsc)
- : copy_copro_load_store (gdbarch, insn, regs, dsc);
+static void
+arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym)
+{
+ if (coff_sym_is_thumb (val))
+ MSYMBOL_SET_SPECIAL (msym);
+}
- case 0x2:
- return copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc);
+static void
+arm_objfile_data_free (struct objfile *objfile, void *arg)
+{
+ struct arm_per_objfile *data = arg;
+ unsigned int i;
- case 0x4: case 0x5: case 0x6: case 0x7:
- /* ldc/ldc2 lit (undefined for rn != pc). */
- return rn_f ? copy_copro_load_store (gdbarch, insn, regs, dsc)
- : copy_undef (gdbarch, insn, dsc);
+ for (i = 0; i < objfile->obfd->section_count; i++)
+ VEC_free (arm_mapping_symbol_s, data->section_maps[i]);
+}
- default:
- return copy_undef (gdbarch, insn, dsc);
- }
- }
+static void
+arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile,
+ asymbol *sym)
+{
+ const char *name = bfd_asymbol_name (sym);
+ struct arm_per_objfile *data;
+ VEC(arm_mapping_symbol_s) **map_p;
+ struct arm_mapping_symbol new_map_sym;
- case 0xa:
- return copy_unmodified (gdbarch, insn, "stc/stc2", dsc);
+ gdb_assert (name[0] == '$');
+ if (name[1] != 'a' && name[1] != 't' && name[1] != 'd')
+ return;
- case 0xb:
- if (bits (insn, 16, 19) == 0xf)
- /* ldc/ldc2 lit. */
- return copy_copro_load_store (gdbarch, insn, regs, dsc);
- else
- return copy_undef (gdbarch, insn, dsc);
+ data = objfile_data (objfile, arm_objfile_data_key);
+ if (data == NULL)
+ {
+ data = OBSTACK_ZALLOC (&objfile->objfile_obstack,
+ struct arm_per_objfile);
+ set_objfile_data (objfile, arm_objfile_data_key, data);
+ data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack,
+ objfile->obfd->section_count,
+ VEC(arm_mapping_symbol_s) *);
+ }
+ map_p = &data->section_maps[bfd_get_section (sym)->index];
- case 0xc:
- if (bit (insn, 4))
- return copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc);
- else
- return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
+ new_map_sym.value = sym->value;
+ new_map_sym.type = name[1];
- case 0xd:
- if (bit (insn, 4))
- return copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc);
- else
- return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
+ /* Assume that most mapping symbols appear in order of increasing
+ value. If they were randomly distributed, it would be faster to
+ always push here and then sort at first use. */
+ if (!VEC_empty (arm_mapping_symbol_s, *map_p))
+ {
+ struct arm_mapping_symbol *prev_map_sym;
- default:
- return copy_undef (gdbarch, insn, dsc);
+ prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p);
+ if (prev_map_sym->value >= sym->value)
+ {
+ unsigned int idx;
+ idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym,
+ arm_compare_mapping_symbols);
+ VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym);
+ return;
+ }
}
-}
-/* Decode miscellaneous instructions in dp/misc encoding space. */
+ VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym);
+}
-static int
-decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+static void
+arm_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- unsigned int op2 = bits (insn, 4, 6);
- unsigned int op = bits (insn, 21, 22);
- unsigned int op1 = bits (insn, 16, 19);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc);
- switch (op2)
+ /* If necessary, set the T bit. */
+ if (arm_apcs_32)
{
- case 0x0:
- return copy_unmodified (gdbarch, insn, "mrs/msr", dsc);
-
- case 0x1:
- if (op == 0x1) /* bx. */
- return copy_bx_blx_reg (gdbarch, insn, regs, dsc);
- else if (op == 0x3)
- return copy_unmodified (gdbarch, insn, "clz", dsc);
+ ULONGEST val, t_bit;
+ regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val);
+ t_bit = arm_psr_thumb_bit (gdbarch);
+ if (arm_pc_is_thumb (gdbarch, pc))
+ regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM,
+ val | t_bit);
else
- return copy_undef (gdbarch, insn, dsc);
+ regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM,
+ val & ~t_bit);
+ }
+}
- case 0x2:
- if (op == 0x1)
- /* Not really supported. */
- return copy_unmodified (gdbarch, insn, "bxj", dsc);
- else
- return copy_undef (gdbarch, insn, dsc);
+/* Read the contents of a NEON quad register, by reading from two
+ double registers. This is used to implement the quad pseudo
+ registers, and for argument passing in case the quad registers are
+ missing; vectors are passed in quad registers when using the VFP
+ ABI, even if a NEON unit is not present. REGNUM is the index of
+ the quad register, in [0, 15]. */
- case 0x3:
- if (op == 0x1)
- return copy_bx_blx_reg (gdbarch, insn, regs, dsc); /* blx register. */
- else
- return copy_undef (gdbarch, insn, dsc);
+static enum register_status
+arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
+{
+ char name_buf[4];
+ gdb_byte reg_buf[8];
+ int offset, double_regnum;
+ enum register_status status;
- case 0x5:
- return copy_unmodified (gdbarch, insn, "saturating add/sub", dsc);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1);
+ double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
- case 0x7:
- if (op == 0x1)
- return copy_unmodified (gdbarch, insn, "bkpt", dsc);
- else if (op == 0x3)
- /* Not really supported. */
- return copy_unmodified (gdbarch, insn, "smc", dsc);
+ /* d0 is always the least significant half of q0. */
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+ offset = 8;
+ else
+ offset = 0;
- default:
- return copy_undef (gdbarch, insn, dsc);
- }
+ status = regcache_raw_read (regcache, double_regnum, reg_buf);
+ if (status != REG_VALID)
+ return status;
+ memcpy (buf + offset, reg_buf, 8);
+
+ offset = 8 - offset;
+ status = regcache_raw_read (regcache, double_regnum + 1, reg_buf);
+ if (status != REG_VALID)
+ return status;
+ memcpy (buf + offset, reg_buf, 8);
+
+ return REG_VALID;
}
-static int
-decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
- struct displaced_step_closure *dsc)
+static enum register_status
+arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
- if (bit (insn, 25))
- switch (bits (insn, 20, 24))
- {
- case 0x10:
- return copy_unmodified (gdbarch, insn, "movw", dsc);
-
- case 0x14:
- return copy_unmodified (gdbarch, insn, "movt", dsc);
+ const int num_regs = gdbarch_num_regs (gdbarch);
+ char name_buf[4];
+ gdb_byte reg_buf[8];
+ int offset, double_regnum;
- case 0x12: case 0x16:
- return copy_unmodified (gdbarch, insn, "msr imm", dsc);
+ gdb_assert (regnum >= num_regs);
+ regnum -= num_regs;
- default:
- return copy_alu_imm (gdbarch, insn, regs, dsc);
- }
+ if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48)
+ /* Quad-precision register. */
+ return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf);
else
{
- uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7);
+ enum register_status status;
- if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0)
- return copy_alu_reg (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1)
- return copy_alu_shifted_reg (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0)
- return decode_miscellaneous (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8)
- return copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc);
- else if ((op1 & 0x10) == 0x00 && op2 == 0x9)
- return copy_unmodified (gdbarch, insn, "mul/mla", dsc);
- else if ((op1 & 0x10) == 0x10 && op2 == 0x9)
- return copy_unmodified (gdbarch, insn, "synch", dsc);
- else if (op2 == 0xb || (op2 & 0xd) == 0xd)
- /* 2nd arg means "unpriveleged". */
- return copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs,
- dsc);
- }
+ /* Single-precision register. */
+ gdb_assert (regnum < 32);
- /* Should be unreachable. */
- return 1;
+ /* s0 is always the least significant half of d0. */
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+ offset = (regnum & 1) ? 0 : 4;
+ else
+ offset = (regnum & 1) ? 4 : 0;
+
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1);
+ double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
+
+ status = regcache_raw_read (regcache, double_regnum, reg_buf);
+ if (status == REG_VALID)
+ memcpy (buf, reg_buf + offset, 4);
+ return status;
+ }
}
-static int
-decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs,
- struct displaced_step_closure *dsc)
+/* Store the contents of BUF to a NEON quad register, by writing to
+ two double registers. This is used to implement the quad pseudo
+ registers, and for argument passing in case the quad registers are
+ missing; vectors are passed in quad registers when using the VFP
+ ABI, even if a NEON unit is not present. REGNUM is the index
+ of the quad register, in [0, 15]. */
+
+static void
+arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
{
- int a = bit (insn, 25), b = bit (insn, 4);
- uint32_t op1 = bits (insn, 20, 24);
- int rn_f = bits (insn, 16, 19) == 0xf;
+ char name_buf[4];
+ int offset, double_regnum;
- if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02)
- || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 0, 0);
- else if ((!a && (op1 & 0x17) == 0x02)
- || (a && (op1 & 0x17) == 0x02 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 0, 1);
- else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03)
- || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 0, 0);
- else if ((!a && (op1 & 0x17) == 0x03)
- || (a && (op1 & 0x17) == 0x03 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 0, 1);
- else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06)
- || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0);
- else if ((!a && (op1 & 0x17) == 0x06)
- || (a && (op1 & 0x17) == 0x06 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1);
- else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07)
- || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0);
- else if ((!a && (op1 & 0x17) == 0x07)
- || (a && (op1 & 0x17) == 0x07 && !b))
- return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1);
+ double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
- /* Should be unreachable. */
- return 1;
+ /* d0 is always the least significant half of q0. */
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+ offset = 8;
+ else
+ offset = 0;
+
+ regcache_raw_write (regcache, double_regnum, buf + offset);
+ offset = 8 - offset;
+ regcache_raw_write (regcache, double_regnum + 1, buf + offset);
}
-static int
-decode_media (struct gdbarch *gdbarch, uint32_t insn,
- struct displaced_step_closure *dsc)
+static void
+arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
{
- switch (bits (insn, 20, 24))
- {
- case 0x00: case 0x01: case 0x02: case 0x03:
- return copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc);
-
- case 0x04: case 0x05: case 0x06: case 0x07:
- return copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc);
+ const int num_regs = gdbarch_num_regs (gdbarch);
+ char name_buf[4];
+ gdb_byte reg_buf[8];
+ int offset, double_regnum;
- case 0x08: case 0x09: case 0x0a: case 0x0b:
- case 0x0c: case 0x0d: case 0x0e: case 0x0f:
- return copy_unmodified (gdbarch, insn,
- "decode/pack/unpack/saturate/reverse", dsc);
+ gdb_assert (regnum >= num_regs);
+ regnum -= num_regs;
- case 0x18:
- if (bits (insn, 5, 7) == 0) /* op2. */
- {
- if (bits (insn, 12, 15) == 0xf)
- return copy_unmodified (gdbarch, insn, "usad8", dsc);
- else
- return copy_unmodified (gdbarch, insn, "usada8", dsc);
- }
- else
- return copy_undef (gdbarch, insn, dsc);
+ if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48)
+ /* Quad-precision register. */
+ arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf);
+ else
+ {
+ /* Single-precision register. */
+ gdb_assert (regnum < 32);
- case 0x1a: case 0x1b:
- if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */
- return copy_unmodified (gdbarch, insn, "sbfx", dsc);
+ /* s0 is always the least significant half of d0. */
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+ offset = (regnum & 1) ? 0 : 4;
else
- return copy_undef (gdbarch, insn, dsc);
+ offset = (regnum & 1) ? 4 : 0;
- case 0x1c: case 0x1d:
- if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */
- {
- if (bits (insn, 0, 3) == 0xf)
- return copy_unmodified (gdbarch, insn, "bfc", dsc);
- else
- return copy_unmodified (gdbarch, insn, "bfi", dsc);
- }
- else
- return copy_undef (gdbarch, insn, dsc);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1);
+ double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
+ strlen (name_buf));
- case 0x1e: case 0x1f:
- if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */
- return copy_unmodified (gdbarch, insn, "ubfx", dsc);
- else
- return copy_undef (gdbarch, insn, dsc);
+ regcache_raw_read (regcache, double_regnum, reg_buf);
+ memcpy (reg_buf + offset, buf, 4);
+ regcache_raw_write (regcache, double_regnum, reg_buf);
}
-
- /* Should be unreachable. */
- return 1;
}
-static int
-decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+static struct value *
+value_of_arm_user_reg (struct frame_info *frame, const void *baton)
{
- if (bit (insn, 25))
- return copy_b_bl_blx (gdbarch, insn, regs, dsc);
- else
- return copy_block_xfer (gdbarch, insn, regs, dsc);
+ const int *reg_p = baton;
+ return value_of_register (*reg_p, frame);
}
-
-static int
-decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn,
- struct regcache *regs, struct displaced_step_closure *dsc)
+\f
+static enum gdb_osabi
+arm_elf_osabi_sniffer (bfd *abfd)
{
- unsigned int opcode = bits (insn, 20, 24);
-
- switch (opcode)
- {
- case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */
- return copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc);
-
- case 0x08: case 0x0a: case 0x0c: case 0x0e:
- case 0x12: case 0x16:
- return copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc);
+ unsigned int elfosabi;
+ enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
- case 0x09: case 0x0b: case 0x0d: case 0x0f:
- case 0x13: case 0x17:
- return copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc);
+ elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
- case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
- case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
- /* Note: no writeback for these instructions. Bit 25 will always be
- zero though (via caller), so the following works OK. */
- return copy_copro_load_store (gdbarch, insn, regs, dsc);
- }
+ if (elfosabi == ELFOSABI_ARM)
+ /* GNU tools use this value. Check note sections in this case,
+ as well. */
+ bfd_map_over_sections (abfd,
+ generic_elf_osabi_sniff_abi_tag_sections,
+ &osabi);
- /* Should be unreachable. */
- return 1;
+ /* Anything else will be handled by the generic ELF sniffer. */
+ return osabi;
}
static int
-decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
- struct regcache *regs, struct displaced_step_closure *dsc)
-{
- unsigned int op1 = bits (insn, 20, 25);
- int op = bit (insn, 4);
- unsigned int coproc = bits (insn, 8, 11);
- unsigned int rn = bits (insn, 16, 19);
+arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
+{
+ /* FPS register's type is INT, but belongs to float_reggroup. Beside
+ this, FPS register belongs to save_regroup, restore_reggroup, and
+ all_reggroup, of course. */
+ if (regnum == ARM_FPS_REGNUM)
+ return (group == float_reggroup
+ || group == save_reggroup
+ || group == restore_reggroup
+ || group == all_reggroup);
+ else
+ return default_register_reggroup_p (gdbarch, regnum, group);
+}
- if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa)
- return decode_ext_reg_ld_st (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00
- && (coproc & 0xe) != 0xa)
- /* stc/stc2. */
- return copy_copro_load_store (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00
- && (coproc & 0xe) != 0xa)
- /* ldc/ldc2 imm/lit. */
- return copy_copro_load_store (gdbarch, insn, regs, dsc);
- else if ((op1 & 0x3e) == 0x00)
- return copy_undef (gdbarch, insn, dsc);
- else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa)
- return copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc);
- else if (op1 == 0x04 && (coproc & 0xe) != 0xa)
- return copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc);
- else if (op1 == 0x05 && (coproc & 0xe) != 0xa)
- return copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc);
- else if ((op1 & 0x30) == 0x20 && !op)
+\f
+/* For backward-compatibility we allow two 'g' packet lengths with
+ the remote protocol depending on whether FPA registers are
+ supplied. M-profile targets do not have FPA registers, but some
+ stubs already exist in the wild which use a 'g' packet which
+ supplies them albeit with dummy values. The packet format which
+ includes FPA registers should be considered deprecated for
+ M-profile targets. */
+
+static void
+arm_register_g_packet_guesses (struct gdbarch *gdbarch)
+{
+ if (gdbarch_tdep (gdbarch)->is_m)
{
- if ((coproc & 0xe) == 0xa)
- return copy_unmodified (gdbarch, insn, "vfp dataproc", dsc);
- else
- return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc);
+ /* If we know from the executable this is an M-profile target,
+ cater for remote targets whose register set layout is the
+ same as the FPA layout. */
+ register_remote_g_packet_guess (gdbarch,
+ /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */
+ (16 * INT_REGISTER_SIZE)
+ + (8 * FP_REGISTER_SIZE)
+ + (2 * INT_REGISTER_SIZE),
+ tdesc_arm_with_m_fpa_layout);
+
+ /* The regular M-profile layout. */
+ register_remote_g_packet_guess (gdbarch,
+ /* r0-r12,sp,lr,pc; xpsr */
+ (16 * INT_REGISTER_SIZE)
+ + INT_REGISTER_SIZE,
+ tdesc_arm_with_m);
+
+ /* M-profile plus M4F VFP. */
+ register_remote_g_packet_guess (gdbarch,
+ /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */
+ (16 * INT_REGISTER_SIZE)
+ + (16 * VFP_REGISTER_SIZE)
+ + (2 * INT_REGISTER_SIZE),
+ tdesc_arm_with_m_vfp_d16);
}
- else if ((op1 & 0x30) == 0x20 && op)
- return copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc);
- else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa)
- return copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc);
- else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa)
- return copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc);
- else if ((op1 & 0x30) == 0x30)
- return copy_svc (gdbarch, insn, to, regs, dsc);
- else
- return copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */
+
+ /* Otherwise we don't have a useful guess. */
}
-void
-arm_process_displaced_insn (struct gdbarch *gdbarch, uint32_t insn,
- CORE_ADDR from, CORE_ADDR to, struct regcache *regs,
- struct displaced_step_closure *dsc)
-{
- int err = 0;
+\f
+/* Initialize the current architecture based on INFO. If possible,
+ re-use an architecture from ARCHES, which is a list of
+ architectures already created during this debugging session.
- if (!displaced_in_arm_mode (regs))
- error (_("Displaced stepping is only supported in ARM mode"));
+ Called e.g. at program startup, when reading a core file, and when
+ reading a binary file. */
- /* Most displaced instructions use a 1-instruction scratch space, so set this
- here and override below if/when necessary. */
- dsc->numinsns = 1;
- dsc->insn_addr = from;
- dsc->scratch_base = to;
- dsc->cleanup = NULL;
- dsc->wrote_to_pc = 0;
+static struct gdbarch *
+arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch_tdep *tdep;
+ struct gdbarch *gdbarch;
+ struct gdbarch_list *best_arch;
+ enum arm_abi_kind arm_abi = arm_abi_global;
+ enum arm_float_model fp_model = arm_fp_model;
+ struct tdesc_arch_data *tdesc_data = NULL;
+ int i, is_m = 0;
+ int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0;
+ int have_neon = 0;
+ int have_fpa_registers = 1;
+ const struct target_desc *tdesc = info.target_desc;
- if ((insn & 0xf0000000) == 0xf0000000)
- err = decode_unconditional (gdbarch, insn, regs, dsc);
- else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24))
- {
- case 0x0: case 0x1: case 0x2: case 0x3:
- err = decode_dp_misc (gdbarch, insn, regs, dsc);
- break;
+ /* If we have an object to base this architecture on, try to determine
+ its ABI. */
- case 0x4: case 0x5: case 0x6:
- err = decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc);
- break;
+ if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL)
+ {
+ int ei_osabi, e_flags;
- case 0x7:
- err = decode_media (gdbarch, insn, dsc);
- break;
+ switch (bfd_get_flavour (info.abfd))
+ {
+ case bfd_target_aout_flavour:
+ /* Assume it's an old APCS-style ABI. */
+ arm_abi = ARM_ABI_APCS;
+ break;
- case 0x8: case 0x9: case 0xa: case 0xb:
- err = decode_b_bl_ldmstm (gdbarch, insn, regs, dsc);
- break;
+ case bfd_target_coff_flavour:
+ /* Assume it's an old APCS-style ABI. */
+ /* XXX WinCE? */
+ arm_abi = ARM_ABI_APCS;
+ break;
- case 0xc: case 0xd: case 0xe: case 0xf:
- err = decode_svc_copro (gdbarch, insn, to, regs, dsc);
- break;
- }
+ case bfd_target_elf_flavour:
+ ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI];
+ e_flags = elf_elfheader (info.abfd)->e_flags;
- if (err)
- internal_error (__FILE__, __LINE__,
- _("arm_process_displaced_insn: Instruction decode error"));
-}
+ if (ei_osabi == ELFOSABI_ARM)
+ {
+ /* GNU tools used to use this value, but do not for EABI
+ objects. There's nowhere to tag an EABI version
+ anyway, so assume APCS. */
+ arm_abi = ARM_ABI_APCS;
+ }
+ else if (ei_osabi == ELFOSABI_NONE)
+ {
+ int eabi_ver = EF_ARM_EABI_VERSION (e_flags);
+ int attr_arch, attr_profile;
-/* Actually set up the scratch space for a displaced instruction. */
+ switch (eabi_ver)
+ {
+ case EF_ARM_EABI_UNKNOWN:
+ /* Assume GNU tools. */
+ arm_abi = ARM_ABI_APCS;
+ break;
-void
-arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
- CORE_ADDR to, struct displaced_step_closure *dsc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- unsigned int i;
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ case EF_ARM_EABI_VER4:
+ case EF_ARM_EABI_VER5:
+ arm_abi = ARM_ABI_AAPCS;
+ /* EABI binaries default to VFP float ordering.
+ They may also contain build attributes that can
+ be used to identify if the VFP argument-passing
+ ABI is in use. */
+ if (fp_model == ARM_FLOAT_AUTO)
+ {
+#ifdef HAVE_ELF
+ switch (bfd_elf_get_obj_attr_int (info.abfd,
+ OBJ_ATTR_PROC,
+ Tag_ABI_VFP_args))
+ {
+ case 0:
+ /* "The user intended FP parameter/result
+ passing to conform to AAPCS, base
+ variant". */
+ fp_model = ARM_FLOAT_SOFT_VFP;
+ break;
+ case 1:
+ /* "The user intended FP parameter/result
+ passing to conform to AAPCS, VFP
+ variant". */
+ fp_model = ARM_FLOAT_VFP;
+ break;
+ case 2:
+ /* "The user intended FP parameter/result
+ passing to conform to tool chain-specific
+ conventions" - we don't know any such
+ conventions, so leave it as "auto". */
+ break;
+ default:
+ /* Attribute value not mentioned in the
+ October 2008 ABI, so leave it as
+ "auto". */
+ break;
+ }
+#else
+ fp_model = ARM_FLOAT_SOFT_VFP;
+#endif
+ }
+ break;
- /* Poke modified instruction(s). */
- for (i = 0; i < dsc->numinsns; i++)
- {
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: writing insn %.8lx at "
- "%.8lx\n", (unsigned long) dsc->modinsn[i],
- (unsigned long) to + i * 4);
- write_memory_unsigned_integer (to + i * 4, 4, byte_order_for_code,
- dsc->modinsn[i]);
- }
+ default:
+ /* Leave it as "auto". */
+ warning (_("unknown ARM EABI version 0x%x"), eabi_ver);
+ break;
+ }
- /* Put breakpoint afterwards. */
- write_memory (to + dsc->numinsns * 4, tdep->arm_breakpoint,
- tdep->arm_breakpoint_size);
+#ifdef HAVE_ELF
+ /* Detect M-profile programs. This only works if the
+ executable file includes build attributes; GCC does
+ copy them to the executable, but e.g. RealView does
+ not. */
+ attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC,
+ Tag_CPU_arch);
+ attr_profile = bfd_elf_get_obj_attr_int (info.abfd,
+ OBJ_ATTR_PROC,
+ Tag_CPU_arch_profile);
+ /* GCC specifies the profile for v6-M; RealView only
+ specifies the profile for architectures starting with
+ V7 (as opposed to architectures with a tag
+ numerically greater than TAG_CPU_ARCH_V7). */
+ if (!tdesc_has_registers (tdesc)
+ && (attr_arch == TAG_CPU_ARCH_V6_M
+ || attr_arch == TAG_CPU_ARCH_V6S_M
+ || attr_profile == 'M'))
+ is_m = 1;
+#endif
+ }
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ",
- paddress (gdbarch, from), paddress (gdbarch, to));
-}
+ if (fp_model == ARM_FLOAT_AUTO)
+ {
+ int e_flags = elf_elfheader (info.abfd)->e_flags;
-/* Entry point for copying an instruction into scratch space for displaced
- stepping. */
+ switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT))
+ {
+ case 0:
+ /* Leave it as "auto". Strictly speaking this case
+ means FPA, but almost nobody uses that now, and
+ many toolchains fail to set the appropriate bits
+ for the floating-point model they use. */
+ break;
+ case EF_ARM_SOFT_FLOAT:
+ fp_model = ARM_FLOAT_SOFT_FPA;
+ break;
+ case EF_ARM_VFP_FLOAT:
+ fp_model = ARM_FLOAT_VFP;
+ break;
+ case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT:
+ fp_model = ARM_FLOAT_SOFT_VFP;
+ break;
+ }
+ }
-struct displaced_step_closure *
-arm_displaced_step_copy_insn (struct gdbarch *gdbarch,
- CORE_ADDR from, CORE_ADDR to,
- struct regcache *regs)
-{
- struct displaced_step_closure *dsc
- = xmalloc (sizeof (struct displaced_step_closure));
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
- uint32_t insn = read_memory_unsigned_integer (from, 4, byte_order_for_code);
+ if (e_flags & EF_ARM_BE8)
+ info.byte_order_for_code = BFD_ENDIAN_LITTLE;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx "
- "at %.8lx\n", (unsigned long) insn,
- (unsigned long) from);
+ break;
- arm_process_displaced_insn (gdbarch, insn, from, to, regs, dsc);
- arm_displaced_init_closure (gdbarch, from, to, dsc);
+ default:
+ /* Leave it as "auto". */
+ break;
+ }
+ }
- return dsc;
-}
+ /* Check any target description for validity. */
+ if (tdesc_has_registers (tdesc))
+ {
+ /* For most registers we require GDB's default names; but also allow
+ the numeric names for sp / lr / pc, as a convenience. */
+ static const char *const arm_sp_names[] = { "r13", "sp", NULL };
+ static const char *const arm_lr_names[] = { "r14", "lr", NULL };
+ static const char *const arm_pc_names[] = { "r15", "pc", NULL };
-/* Entry point for cleaning things up after a displaced instruction has been
- single-stepped. */
+ const struct tdesc_feature *feature;
+ int valid_p;
-void
-arm_displaced_step_fixup (struct gdbarch *gdbarch,
- struct displaced_step_closure *dsc,
- CORE_ADDR from, CORE_ADDR to,
- struct regcache *regs)
-{
- if (dsc->cleanup)
- dsc->cleanup (gdbarch, regs, dsc);
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.arm.core");
+ if (feature == NULL)
+ {
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.arm.m-profile");
+ if (feature == NULL)
+ return NULL;
+ else
+ is_m = 1;
+ }
- if (!dsc->wrote_to_pc)
- regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, dsc->insn_addr + 4);
-}
+ tdesc_data = tdesc_data_alloc ();
-#include "bfd-in2.h"
-#include "libcoff.h"
+ valid_p = 1;
+ for (i = 0; i < ARM_SP_REGNUM; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ arm_register_names[i]);
+ valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
+ ARM_SP_REGNUM,
+ arm_sp_names);
+ valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
+ ARM_LR_REGNUM,
+ arm_lr_names);
+ valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
+ ARM_PC_REGNUM,
+ arm_pc_names);
+ if (is_m)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ ARM_PS_REGNUM, "xpsr");
+ else
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ ARM_PS_REGNUM, "cpsr");
-static int
-gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info)
-{
- struct gdbarch *gdbarch = info->application_data;
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
- if (arm_pc_is_thumb (gdbarch, memaddr))
- {
- static asymbol *asym;
- static combined_entry_type ce;
- static struct coff_symbol_struct csym;
- static struct bfd fake_bfd;
- static bfd_target fake_target;
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.arm.fpa");
+ if (feature != NULL)
+ {
+ valid_p = 1;
+ for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ arm_register_names[i]);
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
+ else
+ have_fpa_registers = 0;
- if (csym.native == NULL)
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.xscale.iwmmxt");
+ if (feature != NULL)
{
- /* Create a fake symbol vector containing a Thumb symbol.
- This is solely so that the code in print_insn_little_arm()
- and print_insn_big_arm() in opcodes/arm-dis.c will detect
- the presence of a Thumb symbol and switch to decoding
- Thumb instructions. */
+ static const char *const iwmmxt_names[] = {
+ "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7",
+ "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15",
+ "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "",
+ "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "",
+ };
- fake_target.flavour = bfd_target_coff_flavour;
- fake_bfd.xvec = &fake_target;
- ce.u.syment.n_sclass = C_THUMBEXTFUNC;
- csym.native = &ce;
- csym.symbol.the_bfd = &fake_bfd;
- csym.symbol.name = "fake";
- asym = (asymbol *) & csym;
- }
+ valid_p = 1;
+ for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++)
+ valid_p
+ &= tdesc_numbered_register (feature, tdesc_data, i,
+ iwmmxt_names[i - ARM_WR0_REGNUM]);
- memaddr = UNMAKE_THUMB_ADDR (memaddr);
- info->symbols = &asym;
- }
- else
- info->symbols = NULL;
+ /* Check for the control registers, but do not fail if they
+ are missing. */
+ for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++)
+ tdesc_numbered_register (feature, tdesc_data, i,
+ iwmmxt_names[i - ARM_WR0_REGNUM]);
- if (info->endian == BFD_ENDIAN_BIG)
- return print_insn_big_arm (memaddr, info);
- else
- return print_insn_little_arm (memaddr, info);
-}
+ for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++)
+ valid_p
+ &= tdesc_numbered_register (feature, tdesc_data, i,
+ iwmmxt_names[i - ARM_WR0_REGNUM]);
-/* The following define instruction sequences that will cause ARM
- cpu's to take an undefined instruction trap. These are used to
- signal a breakpoint to GDB.
-
- The newer ARMv4T cpu's are capable of operating in ARM or Thumb
- modes. A different instruction is required for each mode. The ARM
- cpu's can also be big or little endian. Thus four different
- instructions are needed to support all cases.
-
- Note: ARMv4 defines several new instructions that will take the
- undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
- not in fact add the new instructions. The new undefined
- instructions in ARMv4 are all instructions that had no defined
- behaviour in earlier chips. There is no guarantee that they will
- raise an exception, but may be treated as NOP's. In practice, it
- may only safe to rely on instructions matching:
-
- 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
- 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
-
- Even this may only true if the condition predicate is true. The
- following use a condition predicate of ALWAYS so it is always TRUE.
-
- There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
- and NetBSD all use a software interrupt rather than an undefined
- instruction to force a trap. This can be handled by by the
- abi-specific code during establishment of the gdbarch vector. */
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
-#define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
-#define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
-#define THUMB_LE_BREAKPOINT {0xbe,0xbe}
-#define THUMB_BE_BREAKPOINT {0xbe,0xbe}
+ /* If we have a VFP unit, check whether the single precision registers
+ are present. If not, then we will synthesize them as pseudo
+ registers. */
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.arm.vfp");
+ if (feature != NULL)
+ {
+ static const char *const vfp_double_names[] = {
+ "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
+ "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
+ "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
+ "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
+ };
-static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT;
-static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT;
-static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
-static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
+ /* Require the double precision registers. There must be either
+ 16 or 32. */
+ valid_p = 1;
+ for (i = 0; i < 32; i++)
+ {
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ ARM_D0_REGNUM + i,
+ vfp_double_names[i]);
+ if (!valid_p)
+ break;
+ }
+ if (!valid_p && i == 16)
+ valid_p = 1;
-/* Determine the type and size of breakpoint to insert at PCPTR. Uses
- the program counter value to determine whether a 16-bit or 32-bit
- breakpoint should be used. It returns a pointer to a string of
- bytes that encode a breakpoint instruction, stores the length of
- the string to *lenptr, and adjusts the program counter (if
- necessary) to point to the actual memory location where the
- breakpoint should be inserted. */
+ /* Also require FPSCR. */
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ ARM_FPSCR_REGNUM, "fpscr");
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
-static const unsigned char *
-arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+ if (tdesc_unnumbered_register (feature, "s0") == 0)
+ have_vfp_pseudos = 1;
- if (arm_pc_is_thumb (gdbarch, *pcptr))
- {
- *pcptr = UNMAKE_THUMB_ADDR (*pcptr);
+ have_vfp_registers = 1;
- /* If we have a separate 32-bit breakpoint instruction for Thumb-2,
- check whether we are replacing a 32-bit instruction. */
- if (tdep->thumb2_breakpoint != NULL)
- {
- gdb_byte buf[2];
- if (target_read_memory (*pcptr, buf, 2) == 0)
+ /* If we have VFP, also check for NEON. The architecture allows
+ NEON without VFP (integer vector operations only), but GDB
+ does not support that. */
+ feature = tdesc_find_feature (tdesc,
+ "org.gnu.gdb.arm.neon");
+ if (feature != NULL)
{
- unsigned short inst1;
- inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code);
- if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0)
+ /* NEON requires 32 double-precision registers. */
+ if (i != 32)
{
- *lenptr = tdep->thumb2_breakpoint_size;
- return tdep->thumb2_breakpoint;
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
}
+
+ /* If there are quad registers defined by the stub, use
+ their type; otherwise (normally) provide them with
+ the default type. */
+ if (tdesc_unnumbered_register (feature, "q0") == 0)
+ have_neon_pseudos = 1;
+
+ have_neon = 1;
}
}
-
- *lenptr = tdep->thumb_breakpoint_size;
- return tdep->thumb_breakpoint;
- }
- else
- {
- *lenptr = tdep->arm_breakpoint_size;
- return tdep->arm_breakpoint;
}
-}
-static void
-arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
- int *kindptr)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ /* If there is already a candidate, use it. */
+ for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
+ best_arch != NULL;
+ best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
+ {
+ if (arm_abi != ARM_ABI_AUTO
+ && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi)
+ continue;
- arm_breakpoint_from_pc (gdbarch, pcptr, kindptr);
+ if (fp_model != ARM_FLOAT_AUTO
+ && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model)
+ continue;
- if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4)
- /* The documented magic value for a 32-bit Thumb-2 breakpoint, so
- that this is not confused with a 32-bit ARM breakpoint. */
- *kindptr = 3;
-}
+ /* There are various other properties in tdep that we do not
+ need to check here: those derived from a target description,
+ since gdbarches with a different target description are
+ automatically disqualified. */
-/* Extract from an array REGBUF containing the (raw) register state a
- function return value of type TYPE, and copy that, in virtual
- format, into VALBUF. */
+ /* Do check is_m, though, since it might come from the binary. */
+ if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m)
+ continue;
-static void
-arm_extract_return_value (struct type *type, struct regcache *regs,
- gdb_byte *valbuf)
-{
- struct gdbarch *gdbarch = get_regcache_arch (regs);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ /* Found a match. */
+ break;
+ }
- if (TYPE_CODE_FLT == TYPE_CODE (type))
+ if (best_arch != NULL)
{
- switch (gdbarch_tdep (gdbarch)->fp_model)
- {
- case ARM_FLOAT_FPA:
- {
- /* The value is in register F0 in internal format. We need to
- extract the raw value and then convert it to the desired
- internal type. */
- bfd_byte tmpbuf[FP_REGISTER_SIZE];
+ if (tdesc_data != NULL)
+ tdesc_data_cleanup (tdesc_data);
+ return best_arch->gdbarch;
+ }
- regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf);
- convert_from_extended (floatformat_from_type (type), tmpbuf,
- valbuf, gdbarch_byte_order (gdbarch));
- }
- break;
+ tdep = xcalloc (1, sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
- case ARM_FLOAT_SOFT_FPA:
- case ARM_FLOAT_SOFT_VFP:
- /* ARM_FLOAT_VFP can arise if this is a variadic function so
- not using the VFP ABI code. */
- case ARM_FLOAT_VFP:
- regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf);
- if (TYPE_LENGTH (type) > 4)
- regcache_cooked_read (regs, ARM_A1_REGNUM + 1,
- valbuf + INT_REGISTER_SIZE);
- break;
+ /* Record additional information about the architecture we are defining.
+ These are gdbarch discriminators, like the OSABI. */
+ tdep->arm_abi = arm_abi;
+ tdep->fp_model = fp_model;
+ tdep->is_m = is_m;
+ tdep->have_fpa_registers = have_fpa_registers;
+ tdep->have_vfp_registers = have_vfp_registers;
+ tdep->have_vfp_pseudos = have_vfp_pseudos;
+ tdep->have_neon_pseudos = have_neon_pseudos;
+ tdep->have_neon = have_neon;
- default:
- internal_error
- (__FILE__, __LINE__,
- _("arm_extract_return_value: Floating point model not supported"));
- break;
- }
- }
- else if (TYPE_CODE (type) == TYPE_CODE_INT
- || TYPE_CODE (type) == TYPE_CODE_CHAR
- || TYPE_CODE (type) == TYPE_CODE_BOOL
- || TYPE_CODE (type) == TYPE_CODE_PTR
- || TYPE_CODE (type) == TYPE_CODE_REF
- || TYPE_CODE (type) == TYPE_CODE_ENUM)
- {
- /* If the the type is a plain integer, then the access is
- straight-forward. Otherwise we have to play around a bit more. */
- int len = TYPE_LENGTH (type);
- int regno = ARM_A1_REGNUM;
- ULONGEST tmp;
+ arm_register_g_packet_guesses (gdbarch);
- while (len > 0)
- {
- /* By using store_unsigned_integer we avoid having to do
- anything special for small big-endian values. */
- regcache_cooked_read_unsigned (regs, regno++, &tmp);
- store_unsigned_integer (valbuf,
- (len > INT_REGISTER_SIZE
- ? INT_REGISTER_SIZE : len),
- byte_order, tmp);
- len -= INT_REGISTER_SIZE;
- valbuf += INT_REGISTER_SIZE;
- }
- }
- else
+ /* Breakpoints. */
+ switch (info.byte_order_for_code)
{
- /* For a structure or union the behaviour is as if the value had
- been stored to word-aligned memory and then loaded into
- registers with 32-bit load instruction(s). */
- int len = TYPE_LENGTH (type);
- int regno = ARM_A1_REGNUM;
- bfd_byte tmpbuf[INT_REGISTER_SIZE];
+ case BFD_ENDIAN_BIG:
+ tdep->arm_breakpoint = arm_default_arm_be_breakpoint;
+ tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint);
+ tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint);
- while (len > 0)
- {
- regcache_cooked_read (regs, regno++, tmpbuf);
- memcpy (valbuf, tmpbuf,
- len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len);
- len -= INT_REGISTER_SIZE;
- valbuf += INT_REGISTER_SIZE;
- }
+ break;
+
+ case BFD_ENDIAN_LITTLE:
+ tdep->arm_breakpoint = arm_default_arm_le_breakpoint;
+ tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint);
+ tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint);
+
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("arm_gdbarch_init: bad byte order for float format"));
}
-}
+ /* On ARM targets char defaults to unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
-/* Will a function return an aggregate type in memory or in a
- register? Return 0 if an aggregate type can be returned in a
- register, 1 if it must be returned in memory. */
+ /* Note: for displaced stepping, this includes the breakpoint, and one word
+ of additional scratch space. This setting isn't used for anything beside
+ displaced stepping at present. */
+ set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS);
-static int
-arm_return_in_memory (struct gdbarch *gdbarch, struct type *type)
-{
- int nRc;
- enum type_code code;
+ /* This should be low enough for everything. */
+ tdep->lowest_pc = 0x20;
+ tdep->jb_pc = -1; /* Longjump support not enabled by default. */
- CHECK_TYPEDEF (type);
+ /* The default, for both APCS and AAPCS, is to return small
+ structures in registers. */
+ tdep->struct_return = reg_struct_return;
- /* In the ARM ABI, "integer" like aggregate types are returned in
- registers. For an aggregate type to be integer like, its size
- must be less than or equal to INT_REGISTER_SIZE and the
- offset of each addressable subfield must be zero. Note that bit
- fields are not addressable, and all addressable subfields of
- unions always start at offset zero.
+ set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call);
+ set_gdbarch_frame_align (gdbarch, arm_frame_align);
- This function is based on the behaviour of GCC 2.95.1.
- See: gcc/arm.c: arm_return_in_memory() for details.
+ set_gdbarch_write_pc (gdbarch, arm_write_pc);
+
+ /* Frame handling. */
+ set_gdbarch_dummy_id (gdbarch, arm_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp);
+
+ frame_base_set_default (gdbarch, &arm_normal_base);
+
+ /* Address manipulation. */
+ set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove);
+
+ /* Advance PC across function entry code. */
+ set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue);
+
+ /* Detect whether PC is in function epilogue. */
+ set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p);
+
+ /* Skip trampolines. */
+ set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub);
- Note: All versions of GCC before GCC 2.95.2 do not set up the
- parameters correctly for a function returning the following
- structure: struct { float f;}; This should be returned in memory,
- not a register. Richard Earnshaw sent me a patch, but I do not
- know of any way to detect if a function like the above has been
- compiled with the correct calling convention. */
+ /* The stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- /* All aggregate types that won't fit in a register must be returned
- in memory. */
- if (TYPE_LENGTH (type) > INT_REGISTER_SIZE)
- {
- return 1;
- }
+ /* Breakpoint manipulation. */
+ set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc);
+ set_gdbarch_remote_breakpoint_from_pc (gdbarch,
+ arm_remote_breakpoint_from_pc);
- /* The AAPCS says all aggregates not larger than a word are returned
- in a register. */
- if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS)
- return 0;
+ /* Information about registers, etc. */
+ set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM);
+ set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS);
+ set_gdbarch_register_type (gdbarch, arm_register_type);
+ set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p);
- /* The only aggregate types that can be returned in a register are
- structs and unions. Arrays must be returned in memory. */
- code = TYPE_CODE (type);
- if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code))
- {
- return 1;
- }
+ /* This "info float" is FPA-specific. Use the generic version if we
+ do not have FPA. */
+ if (gdbarch_tdep (gdbarch)->have_fpa_registers)
+ set_gdbarch_print_float_info (gdbarch, arm_print_float_info);
- /* Assume all other aggregate types can be returned in a register.
- Run a check for structures, unions and arrays. */
- nRc = 0;
+ /* Internal <-> external register number maps. */
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum);
+ set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno);
- if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code))
- {
- int i;
- /* Need to check if this struct/union is "integer" like. For
- this to be true, its size must be less than or equal to
- INT_REGISTER_SIZE and the offset of each addressable
- subfield must be zero. Note that bit fields are not
- addressable, and unions always start at offset zero. If any
- of the subfields is a floating point type, the struct/union
- cannot be an integer type. */
+ set_gdbarch_register_name (gdbarch, arm_register_name);
- /* For each field in the object, check:
- 1) Is it FP? --> yes, nRc = 1;
- 2) Is it addressable (bitpos != 0) and
- not packed (bitsize == 0)?
- --> yes, nRc = 1
- */
+ /* Returning results. */
+ set_gdbarch_return_value (gdbarch, arm_return_value);
- for (i = 0; i < TYPE_NFIELDS (type); i++)
- {
- enum type_code field_type_code;
- field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, i)));
+ /* Disassembly. */
+ set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm);
- /* Is it a floating point type field? */
- if (field_type_code == TYPE_CODE_FLT)
- {
- nRc = 1;
- break;
- }
+ /* Minsymbol frobbing. */
+ set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special);
+ set_gdbarch_coff_make_msymbol_special (gdbarch,
+ arm_coff_make_msymbol_special);
+ set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol);
- /* If bitpos != 0, then we have to care about it. */
- if (TYPE_FIELD_BITPOS (type, i) != 0)
- {
- /* Bitfields are not addressable. If the field bitsize is
- zero, then the field is not packed. Hence it cannot be
- a bitfield or any other packed type. */
- if (TYPE_FIELD_BITSIZE (type, i) == 0)
- {
- nRc = 1;
- break;
- }
- }
- }
- }
+ /* Thumb-2 IT block support. */
+ set_gdbarch_adjust_breakpoint_address (gdbarch,
+ arm_adjust_breakpoint_address);
- return nRc;
-}
+ /* Virtual tables. */
+ set_gdbarch_vbit_in_delta (gdbarch, 1);
-/* Write into appropriate registers a function return value of type
- TYPE, given in virtual format. */
+ /* Hook in the ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
-static void
-arm_store_return_value (struct type *type, struct regcache *regs,
- const gdb_byte *valbuf)
-{
- struct gdbarch *gdbarch = get_regcache_arch (regs);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg);
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
- {
- char buf[MAX_REGISTER_SIZE];
+ /* Add some default predicates. */
+ if (is_m)
+ frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind);
+ frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind);
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind);
+ frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind);
- switch (gdbarch_tdep (gdbarch)->fp_model)
- {
- case ARM_FLOAT_FPA:
+ /* Now we have tuned the configuration, set a few final things,
+ based on what the OS ABI has told us. */
- convert_to_extended (floatformat_from_type (type), buf, valbuf,
- gdbarch_byte_order (gdbarch));
- regcache_cooked_write (regs, ARM_F0_REGNUM, buf);
- break;
+ /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI
+ binaries are always marked. */
+ if (tdep->arm_abi == ARM_ABI_AUTO)
+ tdep->arm_abi = ARM_ABI_APCS;
- case ARM_FLOAT_SOFT_FPA:
- case ARM_FLOAT_SOFT_VFP:
- /* ARM_FLOAT_VFP can arise if this is a variadic function so
- not using the VFP ABI code. */
- case ARM_FLOAT_VFP:
- regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf);
- if (TYPE_LENGTH (type) > 4)
- regcache_cooked_write (regs, ARM_A1_REGNUM + 1,
- valbuf + INT_REGISTER_SIZE);
- break;
+ /* Watchpoints are not steppable. */
+ set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
- default:
- internal_error
- (__FILE__, __LINE__,
- _("arm_store_return_value: Floating point model not supported"));
- break;
- }
- }
- else if (TYPE_CODE (type) == TYPE_CODE_INT
- || TYPE_CODE (type) == TYPE_CODE_CHAR
- || TYPE_CODE (type) == TYPE_CODE_BOOL
- || TYPE_CODE (type) == TYPE_CODE_PTR
- || TYPE_CODE (type) == TYPE_CODE_REF
- || TYPE_CODE (type) == TYPE_CODE_ENUM)
- {
- if (TYPE_LENGTH (type) <= 4)
- {
- /* Values of one word or less are zero/sign-extended and
- returned in r0. */
- bfd_byte tmpbuf[INT_REGISTER_SIZE];
- LONGEST val = unpack_long (type, valbuf);
+ /* We used to default to FPA for generic ARM, but almost nobody
+ uses that now, and we now provide a way for the user to force
+ the model. So default to the most useful variant. */
+ if (tdep->fp_model == ARM_FLOAT_AUTO)
+ tdep->fp_model = ARM_FLOAT_SOFT_FPA;
- store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val);
- regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf);
- }
- else
- {
- /* Integral values greater than one word are stored in consecutive
- registers starting with r0. This will always be a multiple of
- the regiser size. */
- int len = TYPE_LENGTH (type);
- int regno = ARM_A1_REGNUM;
+ if (tdep->jb_pc >= 0)
+ set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target);
- while (len > 0)
- {
- regcache_cooked_write (regs, regno++, valbuf);
- len -= INT_REGISTER_SIZE;
- valbuf += INT_REGISTER_SIZE;
- }
- }
+ /* Floating point sizes and format. */
+ set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
+ if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA)
+ {
+ set_gdbarch_double_format
+ (gdbarch, floatformats_ieee_double_littlebyte_bigword);
+ set_gdbarch_long_double_format
+ (gdbarch, floatformats_ieee_double_littlebyte_bigword);
}
else
{
- /* For a structure or union the behaviour is as if the value had
- been stored to word-aligned memory and then loaded into
- registers with 32-bit load instruction(s). */
- int len = TYPE_LENGTH (type);
- int regno = ARM_A1_REGNUM;
- bfd_byte tmpbuf[INT_REGISTER_SIZE];
-
- while (len > 0)
- {
- memcpy (tmpbuf, valbuf,
- len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len);
- regcache_cooked_write (regs, regno++, tmpbuf);
- len -= INT_REGISTER_SIZE;
- valbuf += INT_REGISTER_SIZE;
- }
+ set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
}
-}
-
-/* Handle function return values. */
-
-static enum return_value_convention
-arm_return_value (struct gdbarch *gdbarch, struct type *func_type,
- struct type *valtype, struct regcache *regcache,
- gdb_byte *readbuf, const gdb_byte *writebuf)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- enum arm_vfp_cprc_base_type vfp_base_type;
- int vfp_base_count;
-
- if (arm_vfp_abi_for_function (gdbarch, func_type)
- && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count))
+ if (have_vfp_pseudos)
{
- int reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
- int unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
- int i;
- for (i = 0; i < vfp_base_count; i++)
- {
- if (reg_char == 'q')
- {
- if (writebuf)
- arm_neon_quad_write (gdbarch, regcache, i,
- writebuf + i * unit_length);
-
- if (readbuf)
- arm_neon_quad_read (gdbarch, regcache, i,
- readbuf + i * unit_length);
- }
- else
- {
- char name_buf[4];
- int regnum;
-
- sprintf (name_buf, "%c%d", reg_char, i);
- regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
- if (writebuf)
- regcache_cooked_write (regcache, regnum,
- writebuf + i * unit_length);
- if (readbuf)
- regcache_cooked_read (regcache, regnum,
- readbuf + i * unit_length);
- }
- }
- return RETURN_VALUE_REGISTER_CONVENTION;
+ /* NOTE: These are the only pseudo registers used by
+ the ARM target at the moment. If more are added, a
+ little more care in numbering will be needed. */
+
+ int num_pseudos = 32;
+ if (have_neon_pseudos)
+ num_pseudos += 16;
+ set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos);
+ set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read);
+ set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write);
}
- if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
- || TYPE_CODE (valtype) == TYPE_CODE_UNION
- || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
+ if (tdesc_data)
{
- if (tdep->struct_return == pcc_struct_return
- || arm_return_in_memory (gdbarch, valtype))
- return RETURN_VALUE_STRUCT_CONVENTION;
- }
+ set_tdesc_pseudo_register_name (gdbarch, arm_register_name);
- if (writebuf)
- arm_store_return_value (valtype, regcache, writebuf);
+ tdesc_use_registers (gdbarch, tdesc, tdesc_data);
- if (readbuf)
- arm_extract_return_value (valtype, regcache, readbuf);
+ /* Override tdesc_register_type to adjust the types of VFP
+ registers for NEON. */
+ set_gdbarch_register_type (gdbarch, arm_register_type);
+ }
- return RETURN_VALUE_REGISTER_CONVENTION;
-}
+ /* Add standard register aliases. We add aliases even for those
+ nanes which are used by the current architecture - it's simpler,
+ and does no harm, since nothing ever lists user registers. */
+ for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++)
+ user_reg_add (gdbarch, arm_register_aliases[i].name,
+ value_of_arm_user_reg, &arm_register_aliases[i].regnum);
+ return gdbarch;
+}
-static int
-arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
+static void
+arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR jb_addr;
- char buf[INT_REGISTER_SIZE];
-
- jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM);
- if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf,
- INT_REGISTER_SIZE))
- return 0;
+ if (tdep == NULL)
+ return;
- *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order);
- return 1;
+ fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"),
+ (unsigned long) tdep->lowest_pc);
}
-/* Recognize GCC and GNU ld's trampolines. If we are in a trampoline,
- return the target PC. Otherwise return 0. */
+extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */
-CORE_ADDR
-arm_skip_stub (struct frame_info *frame, CORE_ADDR pc)
+void
+_initialize_arm_tdep (void)
{
- char *name;
- int namelen;
- CORE_ADDR start_addr;
-
- /* Find the starting address and name of the function containing the PC. */
- if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0)
- return 0;
+ struct ui_file *stb;
+ long length;
+ struct cmd_list_element *new_set, *new_show;
+ const char *setname;
+ const char *setdesc;
+ const char *const *regnames;
+ int numregs, i, j;
+ static char *helptext;
+ char regdesc[1024], *rdptr = regdesc;
+ size_t rest = sizeof (regdesc);
- /* If PC is in a Thumb call or return stub, return the address of the
- target PC, which is in a register. The thunk functions are called
- _call_via_xx, where x is the register name. The possible names
- are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar
- functions, named __ARM_call_via_r[0-7]. */
- if (strncmp (name, "_call_via_", 10) == 0
- || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0)
- {
- /* Use the name suffix to determine which register contains the
- target PC. */
- static char *table[15] =
- {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "sl", "fp", "ip", "sp", "lr"
- };
- int regno;
- int offset = strlen (name) - 2;
+ gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep);
- for (regno = 0; regno <= 14; regno++)
- if (strcmp (&name[offset], table[regno]) == 0)
- return get_frame_register_unsigned (frame, regno);
- }
+ arm_objfile_data_key
+ = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free);
- /* GNU ld generates __foo_from_arm or __foo_from_thumb for
- non-interworking calls to foo. We could decode the stubs
- to find the target but it's easier to use the symbol table. */
- namelen = strlen (name);
- if (name[0] == '_' && name[1] == '_'
- && ((namelen > 2 + strlen ("_from_thumb")
- && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb",
- strlen ("_from_thumb")) == 0)
- || (namelen > 2 + strlen ("_from_arm")
- && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm",
- strlen ("_from_arm")) == 0)))
- {
- char *target_name;
- int target_len = namelen - 2;
- struct minimal_symbol *minsym;
- struct objfile *objfile;
- struct obj_section *sec;
+ /* Add ourselves to objfile event chain. */
+ observer_attach_new_objfile (arm_exidx_new_objfile);
+ arm_exidx_data_key
+ = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free);
- if (name[namelen - 1] == 'b')
- target_len -= strlen ("_from_thumb");
- else
- target_len -= strlen ("_from_arm");
+ /* Register an ELF OS ABI sniffer for ARM binaries. */
+ gdbarch_register_osabi_sniffer (bfd_arch_arm,
+ bfd_target_elf_flavour,
+ arm_elf_osabi_sniffer);
- target_name = alloca (target_len + 1);
- memcpy (target_name, name + 2, target_len);
- target_name[target_len] = '\0';
+ /* Initialize the standard target descriptions. */
+ initialize_tdesc_arm_with_m ();
+ initialize_tdesc_arm_with_m_fpa_layout ();
+ initialize_tdesc_arm_with_m_vfp_d16 ();
+ initialize_tdesc_arm_with_iwmmxt ();
+ initialize_tdesc_arm_with_vfpv2 ();
+ initialize_tdesc_arm_with_vfpv3 ();
+ initialize_tdesc_arm_with_neon ();
- sec = find_pc_section (pc);
- objfile = (sec == NULL) ? NULL : sec->objfile;
- minsym = lookup_minimal_symbol (target_name, NULL, objfile);
- if (minsym != NULL)
- return SYMBOL_VALUE_ADDRESS (minsym);
- else
- return 0;
- }
+ /* Get the number of possible sets of register names defined in opcodes. */
+ num_disassembly_options = get_arm_regname_num_options ();
- return 0; /* not a stub */
-}
+ /* Add root prefix command for all "set arm"/"show arm" commands. */
+ add_prefix_cmd ("arm", no_class, set_arm_command,
+ _("Various ARM-specific commands."),
+ &setarmcmdlist, "set arm ", 0, &setlist);
-static void
-set_arm_command (char *args, int from_tty)
-{
- printf_unfiltered (_("\
-\"set arm\" must be followed by an apporpriate subcommand.\n"));
- help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout);
-}
+ add_prefix_cmd ("arm", no_class, show_arm_command,
+ _("Various ARM-specific commands."),
+ &showarmcmdlist, "show arm ", 0, &showlist);
-static void
-show_arm_command (char *args, int from_tty)
-{
- cmd_show_list (showarmcmdlist, from_tty, "");
-}
+ /* Sync the opcode insn printer with our register viewer. */
+ parse_arm_disassembler_option ("reg-names-std");
-static void
-arm_update_current_architecture (void)
-{
- struct gdbarch_info info;
+ /* Initialize the array that will be passed to
+ add_setshow_enum_cmd(). */
+ valid_disassembly_styles
+ = xmalloc ((num_disassembly_options + 1) * sizeof (char *));
+ for (i = 0; i < num_disassembly_options; i++)
+ {
+ numregs = get_arm_regnames (i, &setname, &setdesc, ®names);
+ valid_disassembly_styles[i] = setname;
+ length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc);
+ rdptr += length;
+ rest -= length;
+ /* When we find the default names, tell the disassembler to use
+ them. */
+ if (!strcmp (setname, "std"))
+ {
+ disassembly_style = setname;
+ set_arm_regname_option (i);
+ }
+ }
+ /* Mark the end of valid options. */
+ valid_disassembly_styles[num_disassembly_options] = NULL;
- /* If the current architecture is not ARM, we have nothing to do. */
- if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_arm)
- return;
+ /* Create the help text. */
+ stb = mem_fileopen ();
+ fprintf_unfiltered (stb, "%s%s%s",
+ _("The valid values are:\n"),
+ regdesc,
+ _("The default is \"std\"."));
+ helptext = ui_file_xstrdup (stb, NULL);
+ ui_file_delete (stb);
- /* Update the architecture. */
- gdbarch_info_init (&info);
+ add_setshow_enum_cmd("disassembler", no_class,
+ valid_disassembly_styles, &disassembly_style,
+ _("Set the disassembly style."),
+ _("Show the disassembly style."),
+ helptext,
+ set_disassembly_style_sfunc,
+ NULL, /* FIXME: i18n: The disassembly style is
+ \"%s\". */
+ &setarmcmdlist, &showarmcmdlist);
- if (!gdbarch_update_p (info))
- internal_error (__FILE__, __LINE__, "could not update architecture");
-}
+ add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32,
+ _("Set usage of ARM 32-bit mode."),
+ _("Show usage of ARM 32-bit mode."),
+ _("When off, a 26-bit PC will be used."),
+ NULL,
+ NULL, /* FIXME: i18n: Usage of ARM 32-bit
+ mode is %s. */
+ &setarmcmdlist, &showarmcmdlist);
-static void
-set_fp_model_sfunc (char *args, int from_tty,
- struct cmd_list_element *c)
-{
- enum arm_float_model fp_model;
+ /* Add a command to allow the user to force the FPU model. */
+ add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model,
+ _("Set the floating point type."),
+ _("Show the floating point type."),
+ _("auto - Determine the FP typefrom the OS-ABI.\n\
+softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\
+fpa - FPA co-processor (GCC compiled).\n\
+softvfp - Software FP with pure-endian doubles.\n\
+vfp - VFP co-processor."),
+ set_fp_model_sfunc, show_fp_model,
+ &setarmcmdlist, &showarmcmdlist);
- for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++)
- if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0)
- {
- arm_fp_model = fp_model;
- break;
- }
+ /* Add a command to allow the user to force the ABI. */
+ add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string,
+ _("Set the ABI."),
+ _("Show the ABI."),
+ NULL, arm_set_abi, arm_show_abi,
+ &setarmcmdlist, &showarmcmdlist);
- if (fp_model == ARM_FLOAT_LAST)
- internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."),
- current_fp_model);
+ /* Add two commands to allow the user to force the assumed
+ execution mode. */
+ add_setshow_enum_cmd ("fallback-mode", class_support,
+ arm_mode_strings, &arm_fallback_mode_string,
+ _("Set the mode assumed when symbols are unavailable."),
+ _("Show the mode assumed when symbols are unavailable."),
+ NULL, NULL, arm_show_fallback_mode,
+ &setarmcmdlist, &showarmcmdlist);
+ add_setshow_enum_cmd ("force-mode", class_support,
+ arm_mode_strings, &arm_force_mode_string,
+ _("Set the mode assumed even when symbols are available."),
+ _("Show the mode assumed even when symbols are available."),
+ NULL, NULL, arm_show_force_mode,
+ &setarmcmdlist, &showarmcmdlist);
- arm_update_current_architecture ();
+ /* Debugging flag. */
+ add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug,
+ _("Set ARM debugging."),
+ _("Show ARM debugging."),
+ _("When on, arm-specific debugging is enabled."),
+ NULL,
+ NULL, /* FIXME: i18n: "ARM debugging is %s. */
+ &setdebuglist, &showdebuglist);
}
-static void
-show_fp_model (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
+/* ARM-reversible process record data structures. */
+
+#define ARM_INSN_SIZE_BYTES 4
+#define THUMB_INSN_SIZE_BYTES 2
+#define THUMB2_INSN_SIZE_BYTES 4
+
+
+#define INSN_S_L_BIT_NUM 20
+
+#define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \
+ do \
+ { \
+ unsigned int reg_len = LENGTH; \
+ if (reg_len) \
+ { \
+ REGS = XNEWVEC (uint32_t, reg_len); \
+ memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \
+ } \
+ } \
+ while (0)
+
+#define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \
+ do \
+ { \
+ unsigned int mem_len = LENGTH; \
+ if (mem_len) \
+ { \
+ MEMS = XNEWVEC (struct arm_mem_r, mem_len); \
+ memcpy(&MEMS->len, &RECORD_BUF[0], \
+ sizeof(struct arm_mem_r) * LENGTH); \
+ } \
+ } \
+ while (0)
+
+/* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */
+#define INSN_RECORDED(ARM_RECORD) \
+ (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count)
+
+/* ARM memory record structure. */
+struct arm_mem_r
+{
+ uint32_t len; /* Record length. */
+ uint32_t addr; /* Memory address. */
+};
+
+/* ARM instruction record contains opcode of current insn
+ and execution state (before entry to decode_insn()),
+ contains list of to-be-modified registers and
+ memory blocks (on return from decode_insn()). */
+
+typedef struct insn_decode_record_t
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ struct gdbarch *gdbarch;
+ struct regcache *regcache;
+ CORE_ADDR this_addr; /* Address of the insn being decoded. */
+ uint32_t arm_insn; /* Should accommodate thumb. */
+ uint32_t cond; /* Condition code. */
+ uint32_t opcode; /* Insn opcode. */
+ uint32_t decode; /* Insn decode bits. */
+ uint32_t mem_rec_count; /* No of mem records. */
+ uint32_t reg_rec_count; /* No of reg records. */
+ uint32_t *arm_regs; /* Registers to be saved for this record. */
+ struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */
+} insn_decode_record;
- if (arm_fp_model == ARM_FLOAT_AUTO
- && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm)
- fprintf_filtered (file, _("\
-The current ARM floating point model is \"auto\" (currently \"%s\").\n"),
- fp_model_strings[tdep->fp_model]);
- else
- fprintf_filtered (file, _("\
-The current ARM floating point model is \"%s\".\n"),
- fp_model_strings[arm_fp_model]);
-}
-static void
-arm_set_abi (char *args, int from_tty,
- struct cmd_list_element *c)
+/* Checks ARM SBZ and SBO mandatory fields. */
+
+static int
+sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo)
{
- enum arm_abi_kind arm_abi;
+ uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1));
- for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++)
- if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0)
- {
- arm_abi_global = arm_abi;
- break;
- }
+ if (!len)
+ return 1;
- if (arm_abi == ARM_ABI_LAST)
- internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."),
- arm_abi_string);
+ if (!sbo)
+ ones = ~ones;
- arm_update_current_architecture ();
+ while (ones)
+ {
+ if (!(ones & sbo))
+ {
+ return 0;
+ }
+ ones = ones >> 1;
+ }
+ return 1;
}
-static void
-arm_show_abi (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
+typedef enum
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
-
- if (arm_abi_global == ARM_ABI_AUTO
- && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm)
- fprintf_filtered (file, _("\
-The current ARM ABI is \"auto\" (currently \"%s\").\n"),
- arm_abi_strings[tdep->arm_abi]);
- else
- fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"),
- arm_abi_string);
-}
+ ARM_RECORD_STRH=1,
+ ARM_RECORD_STRD
+} arm_record_strx_t;
-static void
-arm_show_fallback_mode (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
+typedef enum
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ ARM_RECORD=1,
+ THUMB_RECORD,
+ THUMB2_RECORD
+} record_type_t;
- fprintf_filtered (file, _("\
-The current execution mode assumed (when symbols are unavailable) is \"%s\".\n"),
- arm_fallback_mode_string);
-}
-static void
-arm_show_force_mode (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
+static int
+arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf,
+ uint32_t *record_buf_mem, arm_record_strx_t str_type)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
- fprintf_filtered (file, _("\
-The current execution mode assumed (even when symbols are available) is \"%s\".\n"),
- arm_force_mode_string);
-}
+ struct regcache *reg_cache = arm_insn_r->regcache;
+ ULONGEST u_regval[2]= {0};
-/* If the user changes the register disassembly style used for info
- register and other commands, we have to also switch the style used
- in opcodes for disassembly output. This function is run in the "set
- arm disassembly" command, and does that. */
+ uint32_t reg_src1 = 0, reg_src2 = 0;
+ uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0;
+ uint32_t opcode1 = 0;
-static void
-set_disassembly_style_sfunc (char *args, int from_tty,
- struct cmd_list_element *c)
-{
- set_disassembly_style ();
-}
-\f
-/* Return the ARM register name corresponding to register I. */
-static const char *
-arm_register_name (struct gdbarch *gdbarch, int i)
-{
- const int num_regs = gdbarch_num_regs (gdbarch);
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
+ arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
+ opcode1 = bits (arm_insn_r->arm_insn, 20, 24);
- if (gdbarch_tdep (gdbarch)->have_vfp_pseudos
- && i >= num_regs && i < num_regs + 32)
- {
- static const char *const vfp_pseudo_names[] = {
- "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
- "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
- "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
- "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
- };
- return vfp_pseudo_names[i - num_regs];
+ if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
+ {
+ /* 1) Handle misc store, immediate offset. */
+ immed_low = bits (arm_insn_r->arm_insn, 0, 3);
+ immed_high = bits (arm_insn_r->arm_insn, 8, 11);
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1,
+ &u_regval[0]);
+ if (ARM_PC_REGNUM == reg_src1)
+ {
+ /* If R15 was used as Rn, hence current PC+8. */
+ u_regval[0] = u_regval[0] + 8;
+ }
+ offset_8 = (immed_high << 4) | immed_low;
+ /* Calculate target store address. */
+ if (14 == arm_insn_r->opcode)
+ {
+ tgt_mem_addr = u_regval[0] + offset_8;
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[0] - offset_8;
+ }
+ if (ARM_RECORD_STRH == str_type)
+ {
+ record_buf_mem[0] = 2;
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+ }
+ else if (ARM_RECORD_STRD == str_type)
+ {
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = tgt_mem_addr;
+ record_buf_mem[2] = 4;
+ record_buf_mem[3] = tgt_mem_addr + 4;
+ arm_insn_r->mem_rec_count = 2;
+ }
}
-
- if (gdbarch_tdep (gdbarch)->have_neon_pseudos
- && i >= num_regs + 32 && i < num_regs + 32 + 16)
+ else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode)
{
- static const char *const neon_pseudo_names[] = {
- "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7",
- "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15",
- };
-
- return neon_pseudo_names[i - num_regs - 32];
+ /* 2) Store, register offset. */
+ /* Get Rm. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
+ /* Get Rn. */
+ reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
+ if (15 == reg_src2)
+ {
+ /* If R15 was used as Rn, hence current PC+8. */
+ u_regval[0] = u_regval[0] + 8;
+ }
+ /* Calculate target store address, Rn +/- Rm, register offset. */
+ if (12 == arm_insn_r->opcode)
+ {
+ tgt_mem_addr = u_regval[0] + u_regval[1];
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[1] - u_regval[0];
+ }
+ if (ARM_RECORD_STRH == str_type)
+ {
+ record_buf_mem[0] = 2;
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+ }
+ else if (ARM_RECORD_STRD == str_type)
+ {
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = tgt_mem_addr;
+ record_buf_mem[2] = 4;
+ record_buf_mem[3] = tgt_mem_addr + 4;
+ arm_insn_r->mem_rec_count = 2;
+ }
}
-
- if (i >= ARRAY_SIZE (arm_register_names))
- /* These registers are only supported on targets which supply
- an XML description. */
- return "";
-
- return arm_register_names[i];
+ else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
+ || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode)
+ {
+ /* 3) Store, immediate pre-indexed. */
+ /* 5) Store, immediate post-indexed. */
+ immed_low = bits (arm_insn_r->arm_insn, 0, 3);
+ immed_high = bits (arm_insn_r->arm_insn, 8, 11);
+ offset_8 = (immed_high << 4) | immed_low;
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ /* Calculate target store address, Rn +/- Rm, register offset. */
+ if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode)
+ {
+ tgt_mem_addr = u_regval[0] + offset_8;
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[0] - offset_8;
+ }
+ if (ARM_RECORD_STRH == str_type)
+ {
+ record_buf_mem[0] = 2;
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+ }
+ else if (ARM_RECORD_STRD == str_type)
+ {
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = tgt_mem_addr;
+ record_buf_mem[2] = 4;
+ record_buf_mem[3] = tgt_mem_addr + 4;
+ arm_insn_r->mem_rec_count = 2;
+ }
+ /* Record Rn also as it changes. */
+ *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode
+ || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode)
+ {
+ /* 4) Store, register pre-indexed. */
+ /* 6) Store, register post -indexed. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
+ reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
+ /* Calculate target store address, Rn +/- Rm, register offset. */
+ if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode)
+ {
+ tgt_mem_addr = u_regval[0] + u_regval[1];
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[1] - u_regval[0];
+ }
+ if (ARM_RECORD_STRH == str_type)
+ {
+ record_buf_mem[0] = 2;
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+ }
+ else if (ARM_RECORD_STRD == str_type)
+ {
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = tgt_mem_addr;
+ record_buf_mem[2] = 4;
+ record_buf_mem[3] = tgt_mem_addr + 4;
+ arm_insn_r->mem_rec_count = 2;
+ }
+ /* Record Rn also as it changes. */
+ *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ return 0;
}
-static void
-set_disassembly_style (void)
-{
- int current;
+/* Handling ARM extension space insns. */
- /* Find the style that the user wants. */
- for (current = 0; current < num_disassembly_options; current++)
- if (disassembly_style == valid_disassembly_styles[current])
- break;
- gdb_assert (current < num_disassembly_options);
+static int
+arm_record_extension_space (insn_decode_record *arm_insn_r)
+{
+ uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */
+ uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0;
+ uint32_t record_buf[8], record_buf_mem[8];
+ uint32_t reg_src1 = 0;
+ uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0;
+ struct regcache *reg_cache = arm_insn_r->regcache;
+ ULONGEST u_regval = 0;
+
+ gdb_assert (!INSN_RECORDED(arm_insn_r));
+ /* Handle unconditional insn extension space. */
+
+ opcode1 = bits (arm_insn_r->arm_insn, 20, 27);
+ opcode2 = bits (arm_insn_r->arm_insn, 4, 7);
+ if (arm_insn_r->cond)
+ {
+ /* PLD has no affect on architectural state, it just affects
+ the caches. */
+ if (5 == ((opcode1 & 0xE0) >> 5))
+ {
+ /* BLX(1) */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */
+ }
- /* Synchronize the disassembler. */
- set_arm_regname_option (current);
-}
-/* Test whether the coff symbol specific value corresponds to a Thumb
- function. */
+ opcode1 = bits (arm_insn_r->arm_insn, 25, 27);
+ if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4))
+ {
+ ret = -1;
+ /* Undefined instruction on ARM V5; need to handle if later
+ versions define it. */
+ }
-static int
-coff_sym_is_thumb (int val)
-{
- return (val == C_THUMBEXT
- || val == C_THUMBSTAT
- || val == C_THUMBEXTFUNC
- || val == C_THUMBSTATFUNC
- || val == C_THUMBLABEL);
-}
+ opcode1 = bits (arm_insn_r->arm_insn, 24, 27);
+ opcode2 = bits (arm_insn_r->arm_insn, 4, 7);
+ insn_op1 = bits (arm_insn_r->arm_insn, 20, 23);
-/* arm_coff_make_msymbol_special()
- arm_elf_make_msymbol_special()
-
- These functions test whether the COFF or ELF symbol corresponds to
- an address in thumb code, and set a "special" bit in a minimal
- symbol to indicate that it does. */
-
-static void
-arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym)
-{
- /* Thumb symbols are of type STT_LOPROC, (synonymous with
- STT_ARM_TFUNC). */
- if (ELF_ST_TYPE (((elf_symbol_type *)sym)->internal_elf_sym.st_info)
- == STT_LOPROC)
- MSYMBOL_SET_SPECIAL (msym);
-}
+ /* Handle arithmetic insn extension space. */
+ if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond
+ && !INSN_RECORDED(arm_insn_r))
+ {
+ /* Handle MLA(S) and MUL(S). */
+ if (0 <= insn_op1 && 3 >= insn_op1)
+ {
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (4 <= insn_op1 && 15 >= insn_op1)
+ {
+ /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
+ record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[2] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 3;
+ }
+ }
-static void
-arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym)
-{
- if (coff_sym_is_thumb (val))
- MSYMBOL_SET_SPECIAL (msym);
-}
+ opcode1 = bits (arm_insn_r->arm_insn, 26, 27);
+ opcode2 = bits (arm_insn_r->arm_insn, 23, 24);
+ insn_op1 = bits (arm_insn_r->arm_insn, 21, 22);
-static void
-arm_objfile_data_free (struct objfile *objfile, void *arg)
-{
- struct arm_per_objfile *data = arg;
- unsigned int i;
+ /* Handle control insn extension space. */
- for (i = 0; i < objfile->obfd->section_count; i++)
- VEC_free (arm_mapping_symbol_s, data->section_maps[i]);
-}
+ if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20)
+ && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r))
+ {
+ if (!bit (arm_insn_r->arm_insn,25))
+ {
+ if (!bits (arm_insn_r->arm_insn, 4, 7))
+ {
+ if ((0 == insn_op1) || (2 == insn_op1))
+ {
+ /* MRS. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (1 == insn_op1)
+ {
+ /* CSPR is going to be changed. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (3 == insn_op1)
+ {
+ /* SPSR is going to be changed. */
+ /* We need to get SPSR value, which is yet to be done. */
+ printf_unfiltered (_("Process record does not support "
+ "instruction 0x%0x at address %s.\n"),
+ arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch,
+ arm_insn_r->this_addr));
+ return -1;
+ }
+ }
+ else if (1 == bits (arm_insn_r->arm_insn, 4, 7))
+ {
+ if (1 == insn_op1)
+ {
+ /* BX. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (3 == insn_op1)
+ {
+ /* CLZ. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ }
+ else if (3 == bits (arm_insn_r->arm_insn, 4, 7))
+ {
+ /* BLX. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (5 == bits (arm_insn_r->arm_insn, 4, 7))
+ {
+ /* QADD, QSUB, QDADD, QDSUB */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (7 == bits (arm_insn_r->arm_insn, 4, 7))
+ {
+ /* BKPT. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+
+ /* Save SPSR also;how? */
+ printf_unfiltered (_("Process record does not support "
+ "instruction 0x%0x at address %s.\n"),
+ arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
+ return -1;
+ }
+ else if(8 == bits (arm_insn_r->arm_insn, 4, 7)
+ || 10 == bits (arm_insn_r->arm_insn, 4, 7)
+ || 12 == bits (arm_insn_r->arm_insn, 4, 7)
+ || 14 == bits (arm_insn_r->arm_insn, 4, 7)
+ )
+ {
+ if (0 == insn_op1 || 1 == insn_op1)
+ {
+ /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */
+ /* We dont do optimization for SMULW<y> where we
+ need only Rd. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (2 == insn_op1)
+ {
+ /* SMLAL<x><y>. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19);
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (3 == insn_op1)
+ {
+ /* SMUL<x><y>. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ }
+ }
+ else
+ {
+ /* MSR : immediate form. */
+ if (1 == insn_op1)
+ {
+ /* CSPR is going to be changed. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (3 == insn_op1)
+ {
+ /* SPSR is going to be changed. */
+ /* we need to get SPSR value, which is yet to be done */
+ printf_unfiltered (_("Process record does not support "
+ "instruction 0x%0x at address %s.\n"),
+ arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch,
+ arm_insn_r->this_addr));
+ return -1;
+ }
+ }
+ }
-static void
-arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile,
- asymbol *sym)
-{
- const char *name = bfd_asymbol_name (sym);
- struct arm_per_objfile *data;
- VEC(arm_mapping_symbol_s) **map_p;
- struct arm_mapping_symbol new_map_sym;
+ opcode1 = bits (arm_insn_r->arm_insn, 25, 27);
+ opcode2 = bits (arm_insn_r->arm_insn, 20, 24);
+ insn_op1 = bits (arm_insn_r->arm_insn, 5, 6);
- gdb_assert (name[0] == '$');
- if (name[1] != 'a' && name[1] != 't' && name[1] != 'd')
- return;
+ /* Handle load/store insn extension space. */
- data = objfile_data (objfile, arm_objfile_data_key);
- if (data == NULL)
+ if (!opcode1 && bit (arm_insn_r->arm_insn, 7)
+ && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond
+ && !INSN_RECORDED(arm_insn_r))
+ {
+ /* SWP/SWPB. */
+ if (0 == insn_op1)
+ {
+ /* These insn, changes register and memory as well. */
+ /* SWP or SWPB insn. */
+ /* Get memory address given by Rn. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
+ /* SWP insn ?, swaps word. */
+ if (8 == arm_insn_r->opcode)
+ {
+ record_buf_mem[0] = 4;
+ }
+ else
+ {
+ /* SWPB insn, swaps only byte. */
+ record_buf_mem[0] = 1;
+ }
+ record_buf_mem[1] = u_regval;
+ arm_insn_r->mem_rec_count = 1;
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
+ {
+ /* STRH. */
+ arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
+ ARM_RECORD_STRH);
+ }
+ else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
+ {
+ /* LDRD. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = record_buf[0] + 1;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
+ {
+ /* STRD. */
+ arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
+ ARM_RECORD_STRD);
+ }
+ else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3)
+ {
+ /* LDRH, LDRSB, LDRSH. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+
+ }
+
+ opcode1 = bits (arm_insn_r->arm_insn, 23, 27);
+ if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21)
+ && !INSN_RECORDED(arm_insn_r))
{
- data = OBSTACK_ZALLOC (&objfile->objfile_obstack,
- struct arm_per_objfile);
- set_objfile_data (objfile, arm_objfile_data_key, data);
- data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack,
- objfile->obfd->section_count,
- VEC(arm_mapping_symbol_s) *);
+ ret = -1;
+ /* Handle coprocessor insn extension space. */
}
- map_p = &data->section_maps[bfd_get_section (sym)->index];
- new_map_sym.value = sym->value;
- new_map_sym.type = name[1];
+ /* To be done for ARMv5 and later; as of now we return -1. */
+ if (-1 == ret)
+ printf_unfiltered (_("Process record does not support instruction x%0x "
+ "at address %s.\n"),arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
- /* Assume that most mapping symbols appear in order of increasing
- value. If they were randomly distributed, it would be faster to
- always push here and then sort at first use. */
- if (!VEC_empty (arm_mapping_symbol_s, *map_p))
- {
- struct arm_mapping_symbol *prev_map_sym;
- prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p);
- if (prev_map_sym->value >= sym->value)
- {
- unsigned int idx;
- idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym,
- arm_compare_mapping_symbols);
- VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym);
- return;
- }
- }
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
- VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym);
+ return ret;
}
-static void
-arm_write_pc (struct regcache *regcache, CORE_ADDR pc)
+/* Handling opcode 000 insns. */
+
+static int
+arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc);
+ struct regcache *reg_cache = arm_insn_r->regcache;
+ uint32_t record_buf[8], record_buf_mem[8];
+ ULONGEST u_regval[2] = {0};
- /* If necessary, set the T bit. */
- if (arm_apcs_32)
+ uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0;
+ uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0;
+ uint32_t opcode1 = 0;
+
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
+ arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
+ opcode1 = bits (arm_insn_r->arm_insn, 20, 24);
+
+ /* Data processing insn /multiply insn. */
+ if (9 == arm_insn_r->decode
+ && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode)
+ || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode)))
{
- ULONGEST val, t_bit;
- regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val);
- t_bit = arm_psr_thumb_bit (gdbarch);
- if (arm_pc_is_thumb (gdbarch, pc))
- regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM,
- val | t_bit);
+ /* Handle multiply instructions. */
+ /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */
+ if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode)
+ {
+ /* Handle MLA and MUL. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode)
+ {
+ /* Handle SMLAL, SMULL, UMLAL, UMULL. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
+ record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[2] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 3;
+ }
+ }
+ else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)
+ && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode))
+ {
+ /* Handle misc load insns, as 20th bit (L = 1). */
+ /* LDR insn has a capability to do branching, if
+ MOV LR, PC is precceded by LDR insn having Rn as R15
+ in that case, it emulates branch and link insn, and hence we
+ need to save CSPR and PC as well. I am not sure this is right
+ place; as opcode = 010 LDR insn make this happen, if R15 was
+ used. */
+ reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
+ if (15 != reg_dest)
+ {
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
else
- regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM,
- val & ~t_bit);
+ {
+ record_buf[0] = reg_dest;
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ }
+ else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode)
+ && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0)
+ && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1)
+ && 2 == bits (arm_insn_r->arm_insn, 20, 21))
+ {
+ /* Handle MSR insn. */
+ if (9 == arm_insn_r->opcode)
+ {
+ /* CSPR is going to be changed. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ /* SPSR is going to be changed. */
+ /* How to read SPSR value? */
+ printf_unfiltered (_("Process record does not support instruction "
+ "0x%0x at address %s.\n"),
+ arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
+ return -1;
+ }
+ }
+ else if (9 == arm_insn_r->decode
+ && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
+ && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
+ {
+ /* Handling SWP, SWPB. */
+ /* These insn, changes register and memory as well. */
+ /* SWP or SWPB insn. */
+
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ /* SWP insn ?, swaps word. */
+ if (8 == arm_insn_r->opcode)
+ {
+ record_buf_mem[0] = 4;
+ }
+ else
+ {
+ /* SWPB insn, swaps only byte. */
+ record_buf_mem[0] = 1;
+ }
+ record_buf_mem[1] = u_regval[0];
+ arm_insn_r->mem_rec_count = 1;
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
}
+ else if (3 == arm_insn_r->decode && 0x12 == opcode1
+ && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1))
+ {
+ /* Handle BLX, branch and link/exchange. */
+ if (9 == arm_insn_r->opcode)
+ {
+ /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm,
+ and R14 stores the return address. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ }
+ else if (7 == arm_insn_r->decode && 0x12 == opcode1)
+ {
+ /* Handle enhanced software breakpoint insn, BKPT. */
+ /* CPSR is changed to be executed in ARM state, disabling normal
+ interrupts, entering abort mode. */
+ /* According to high vector configuration PC is set. */
+ /* user hit breakpoint and type reverse, in
+ that case, we need to go back with previous CPSR and
+ Program Counter. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+
+ /* Save SPSR also; how? */
+ printf_unfiltered (_("Process record does not support instruction "
+ "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch,
+ arm_insn_r->this_addr));
+ return -1;
+ }
+ else if (11 == arm_insn_r->decode
+ && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
+ {
+ /* Handle enhanced store insns and DSP insns (e.g. LDRD). */
+
+ /* Handle str(x) insn */
+ arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
+ ARM_RECORD_STRH);
+ }
+ else if (1 == arm_insn_r->decode && 0x12 == opcode1
+ && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1))
+ {
+ /* Handle BX, branch and link/exchange. */
+ /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (1 == arm_insn_r->decode && 0x16 == opcode1
+ && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1)
+ && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1))
+ {
+ /* Count leading zeros: CLZ. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)
+ && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
+ && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)
+ && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0)
+ )
+ {
+ /* Handle MRS insn. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else if (arm_insn_r->opcode <= 15)
+ {
+ /* Normal data processing insns. */
+ /* Out of 11 shifter operands mode, all the insn modifies destination
+ register, which is specified by 13-16 decode. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ else
+ {
+ return -1;
+ }
+
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
+ return 0;
}
-/* Read the contents of a NEON quad register, by reading from two
- double registers. This is used to implement the quad pseudo
- registers, and for argument passing in case the quad registers are
- missing; vectors are passed in quad registers when using the VFP
- ABI, even if a NEON unit is not present. REGNUM is the index of
- the quad register, in [0, 15]. */
+/* Handling opcode 001 insns. */
-static void
-arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, gdb_byte *buf)
+static int
+arm_record_data_proc_imm (insn_decode_record *arm_insn_r)
{
- char name_buf[4];
- gdb_byte reg_buf[8];
- int offset, double_regnum;
+ uint32_t record_buf[8], record_buf_mem[8];
- sprintf (name_buf, "d%d", regnum << 1);
- double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
+ arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
- /* d0 is always the least significant half of q0. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- offset = 8;
+ if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode)
+ && 2 == bits (arm_insn_r->arm_insn, 20, 21)
+ && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1)
+ )
+ {
+ /* Handle MSR insn. */
+ if (9 == arm_insn_r->opcode)
+ {
+ /* CSPR is going to be changed. */
+ record_buf[0] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ /* SPSR is going to be changed. */
+ }
+ }
+ else if (arm_insn_r->opcode <= 15)
+ {
+ /* Normal data processing insns. */
+ /* Out of 11 shifter operands mode, all the insn modifies destination
+ register, which is specified by 13-16 decode. */
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
else
- offset = 0;
-
- regcache_raw_read (regcache, double_regnum, reg_buf);
- memcpy (buf + offset, reg_buf, 8);
+ {
+ return -1;
+ }
- offset = 8 - offset;
- regcache_raw_read (regcache, double_regnum + 1, reg_buf);
- memcpy (buf + offset, reg_buf, 8);
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
+ return 0;
}
-static void
-arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, gdb_byte *buf)
+/* Handling opcode 010 insns. */
+
+static int
+arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r)
{
- const int num_regs = gdbarch_num_regs (gdbarch);
- char name_buf[4];
- gdb_byte reg_buf[8];
- int offset, double_regnum;
+ struct regcache *reg_cache = arm_insn_r->regcache;
- gdb_assert (regnum >= num_regs);
- regnum -= num_regs;
+ uint32_t reg_src1 = 0 , reg_dest = 0;
+ uint32_t offset_12 = 0, tgt_mem_addr = 0;
+ uint32_t record_buf[8], record_buf_mem[8];
- if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48)
- /* Quad-precision register. */
- arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf);
+ ULONGEST u_regval = 0;
+
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
+ arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
+
+ if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
+ {
+ reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
+ /* LDR insn has a capability to do branching, if
+ MOV LR, PC is precedded by LDR insn having Rn as R15
+ in that case, it emulates branch and link insn, and hence we
+ need to save CSPR and PC as well. */
+ if (ARM_PC_REGNUM != reg_dest)
+ {
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ record_buf[0] = reg_dest;
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ }
else
{
- /* Single-precision register. */
- gdb_assert (regnum < 32);
-
- /* s0 is always the least significant half of d0. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- offset = (regnum & 1) ? 0 : 4;
+ /* Store, immediate offset, immediate pre-indexed,
+ immediate post-indexed. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ offset_12 = bits (arm_insn_r->arm_insn, 0, 11);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
+ /* U == 1 */
+ if (bit (arm_insn_r->arm_insn, 23))
+ {
+ tgt_mem_addr = u_regval + offset_12;
+ }
else
- offset = (regnum & 1) ? 4 : 0;
-
- sprintf (name_buf, "d%d", regnum >> 1);
- double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
+ {
+ tgt_mem_addr = u_regval - offset_12;
+ }
- regcache_raw_read (regcache, double_regnum, reg_buf);
- memcpy (buf, reg_buf + offset, 4);
+ switch (arm_insn_r->opcode)
+ {
+ /* STR. */
+ case 8:
+ case 12:
+ /* STR. */
+ case 9:
+ case 13:
+ /* STRT. */
+ case 1:
+ case 5:
+ /* STR. */
+ case 4:
+ case 0:
+ record_buf_mem[0] = 4;
+ break;
+
+ /* STRB. */
+ case 10:
+ case 14:
+ /* STRB. */
+ case 11:
+ case 15:
+ /* STRBT. */
+ case 3:
+ case 7:
+ /* STRB. */
+ case 2:
+ case 6:
+ record_buf_mem[0] = 1;
+ break;
+
+ default:
+ gdb_assert_not_reached ("no decoding pattern found");
+ break;
+ }
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+
+ if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
+ || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
+ || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
+ || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
+ || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
+ || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
+ )
+ {
+ /* We are handling pre-indexed mode; post-indexed mode;
+ where Rn is going to be changed. */
+ record_buf[0] = reg_src1;
+ arm_insn_r->reg_rec_count = 1;
+ }
}
+
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
+ return 0;
}
-/* Store the contents of BUF to a NEON quad register, by writing to
- two double registers. This is used to implement the quad pseudo
- registers, and for argument passing in case the quad registers are
- missing; vectors are passed in quad registers when using the VFP
- ABI, even if a NEON unit is not present. REGNUM is the index
- of the quad register, in [0, 15]. */
+/* Handling opcode 011 insns. */
-static void
-arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, const gdb_byte *buf)
+static int
+arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r)
{
- char name_buf[4];
- gdb_byte reg_buf[8];
- int offset, double_regnum;
-
- sprintf (name_buf, "d%d", regnum << 1);
- double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
+ struct regcache *reg_cache = arm_insn_r->regcache;
- /* d0 is always the least significant half of q0. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- offset = 8;
- else
- offset = 0;
+ uint32_t shift_imm = 0;
+ uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0;
+ uint32_t offset_12 = 0, tgt_mem_addr = 0;
+ uint32_t record_buf[8], record_buf_mem[8];
- regcache_raw_write (regcache, double_regnum, buf + offset);
- offset = 8 - offset;
- regcache_raw_write (regcache, double_regnum + 1, buf + offset);
-}
+ LONGEST s_word;
+ ULONGEST u_regval[2];
-static void
-arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, const gdb_byte *buf)
-{
- const int num_regs = gdbarch_num_regs (gdbarch);
- char name_buf[4];
- gdb_byte reg_buf[8];
- int offset, double_regnum;
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
+ arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
- gdb_assert (regnum >= num_regs);
- regnum -= num_regs;
+ /* Handle enhanced store insns and LDRD DSP insn,
+ order begins according to addressing modes for store insns
+ STRH insn. */
- if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48)
- /* Quad-precision register. */
- arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf);
+ /* LDR or STR? */
+ if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
+ {
+ reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
+ /* LDR insn has a capability to do branching, if
+ MOV LR, PC is precedded by LDR insn having Rn as R15
+ in that case, it emulates branch and link insn, and hence we
+ need to save CSPR and PC as well. */
+ if (15 != reg_dest)
+ {
+ record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
+ arm_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ record_buf[0] = reg_dest;
+ record_buf[1] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = 2;
+ }
+ }
else
{
- /* Single-precision register. */
- gdb_assert (regnum < 32);
-
- /* s0 is always the least significant half of d0. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- offset = (regnum & 1) ? 0 : 4;
+ if (! bits (arm_insn_r->arm_insn, 4, 11))
+ {
+ /* Store insn, register offset and register pre-indexed,
+ register post-indexed. */
+ /* Get Rm. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
+ /* Get Rn. */
+ reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1
+ , &u_regval[0]);
+ regcache_raw_read_unsigned (reg_cache, reg_src2
+ , &u_regval[1]);
+ if (15 == reg_src2)
+ {
+ /* If R15 was used as Rn, hence current PC+8. */
+ /* Pre-indexed mode doesnt reach here ; illegal insn. */
+ u_regval[0] = u_regval[0] + 8;
+ }
+ /* Calculate target store address, Rn +/- Rm, register offset. */
+ /* U == 1. */
+ if (bit (arm_insn_r->arm_insn, 23))
+ {
+ tgt_mem_addr = u_regval[0] + u_regval[1];
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[1] - u_regval[0];
+ }
+
+ switch (arm_insn_r->opcode)
+ {
+ /* STR. */
+ case 8:
+ case 12:
+ /* STR. */
+ case 9:
+ case 13:
+ /* STRT. */
+ case 1:
+ case 5:
+ /* STR. */
+ case 0:
+ case 4:
+ record_buf_mem[0] = 4;
+ break;
+
+ /* STRB. */
+ case 10:
+ case 14:
+ /* STRB. */
+ case 11:
+ case 15:
+ /* STRBT. */
+ case 3:
+ case 7:
+ /* STRB. */
+ case 2:
+ case 6:
+ record_buf_mem[0] = 1;
+ break;
+
+ default:
+ gdb_assert_not_reached ("no decoding pattern found");
+ break;
+ }
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+
+ if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
+ || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
+ || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
+ || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
+ || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
+ || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
+ )
+ {
+ /* Rn is going to be changed in pre-indexed mode and
+ post-indexed mode as well. */
+ record_buf[0] = reg_src2;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ }
else
- offset = (regnum & 1) ? 4 : 0;
-
- sprintf (name_buf, "d%d", regnum >> 1);
- double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
- strlen (name_buf));
-
- regcache_raw_read (regcache, double_regnum, reg_buf);
- memcpy (reg_buf + offset, buf, 4);
- regcache_raw_write (regcache, double_regnum, reg_buf);
+ {
+ /* Store insn, scaled register offset; scaled pre-indexed. */
+ offset_12 = bits (arm_insn_r->arm_insn, 5, 6);
+ /* Get Rm. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
+ /* Get Rn. */
+ reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
+ /* Get shift_imm. */
+ shift_imm = bits (arm_insn_r->arm_insn, 7, 11);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ regcache_raw_read_signed (reg_cache, reg_src1, &s_word);
+ regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
+ /* Offset_12 used as shift. */
+ switch (offset_12)
+ {
+ case 0:
+ /* Offset_12 used as index. */
+ offset_12 = u_regval[0] << shift_imm;
+ break;
+
+ case 1:
+ offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm;
+ break;
+
+ case 2:
+ if (!shift_imm)
+ {
+ if (bit (u_regval[0], 31))
+ {
+ offset_12 = 0xFFFFFFFF;
+ }
+ else
+ {
+ offset_12 = 0;
+ }
+ }
+ else
+ {
+ /* This is arithmetic shift. */
+ offset_12 = s_word >> shift_imm;
+ }
+ break;
+
+ case 3:
+ if (!shift_imm)
+ {
+ regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM,
+ &u_regval[1]);
+ /* Get C flag value and shift it by 31. */
+ offset_12 = (((bit (u_regval[1], 29)) << 31) \
+ | (u_regval[0]) >> 1);
+ }
+ else
+ {
+ offset_12 = (u_regval[0] >> shift_imm) \
+ | (u_regval[0] <<
+ (sizeof(uint32_t) - shift_imm));
+ }
+ break;
+
+ default:
+ gdb_assert_not_reached ("no decoding pattern found");
+ break;
+ }
+
+ regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
+ /* bit U set. */
+ if (bit (arm_insn_r->arm_insn, 23))
+ {
+ tgt_mem_addr = u_regval[1] + offset_12;
+ }
+ else
+ {
+ tgt_mem_addr = u_regval[1] - offset_12;
+ }
+
+ switch (arm_insn_r->opcode)
+ {
+ /* STR. */
+ case 8:
+ case 12:
+ /* STR. */
+ case 9:
+ case 13:
+ /* STRT. */
+ case 1:
+ case 5:
+ /* STR. */
+ case 0:
+ case 4:
+ record_buf_mem[0] = 4;
+ break;
+
+ /* STRB. */
+ case 10:
+ case 14:
+ /* STRB. */
+ case 11:
+ case 15:
+ /* STRBT. */
+ case 3:
+ case 7:
+ /* STRB. */
+ case 2:
+ case 6:
+ record_buf_mem[0] = 1;
+ break;
+
+ default:
+ gdb_assert_not_reached ("no decoding pattern found");
+ break;
+ }
+ record_buf_mem[1] = tgt_mem_addr;
+ arm_insn_r->mem_rec_count = 1;
+
+ if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
+ || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
+ || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
+ || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
+ || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
+ || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
+ )
+ {
+ /* Rn is going to be changed in register scaled pre-indexed
+ mode,and scaled post indexed mode. */
+ record_buf[0] = reg_src2;
+ arm_insn_r->reg_rec_count = 1;
+ }
+ }
}
-}
-static struct value *
-value_of_arm_user_reg (struct frame_info *frame, const void *baton)
-{
- const int *reg_p = baton;
- return value_of_register (*reg_p, frame);
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
+ return 0;
}
-\f
-static enum gdb_osabi
-arm_elf_osabi_sniffer (bfd *abfd)
-{
- unsigned int elfosabi;
- enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
- elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
+/* Handling opcode 100 insns. */
- if (elfosabi == ELFOSABI_ARM)
- /* GNU tools use this value. Check note sections in this case,
- as well. */
- bfd_map_over_sections (abfd,
- generic_elf_osabi_sniff_abi_tag_sections,
- &osabi);
+static int
+arm_record_ld_st_multiple (insn_decode_record *arm_insn_r)
+{
+ struct regcache *reg_cache = arm_insn_r->regcache;
- /* Anything else will be handled by the generic ELF sniffer. */
- return osabi;
-}
+ uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0;
+ uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0;
+ uint32_t start_address = 0, index = 0;
+ uint32_t record_buf[24], record_buf_mem[48];
-\f
-/* Initialize the current architecture based on INFO. If possible,
- re-use an architecture from ARCHES, which is a list of
- architectures already created during this debugging session.
+ ULONGEST u_regval[2] = {0};
- Called e.g. at program startup, when reading a core file, and when
- reading a binary file. */
+ /* This mode is exclusively for load and store multiple. */
+ /* Handle incremenrt after/before and decrment after.before mode;
+ Rn is changing depending on W bit, but as of now we store Rn too
+ without optimization. */
-static struct gdbarch *
-arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
-{
- struct gdbarch_tdep *tdep;
- struct gdbarch *gdbarch;
- struct gdbarch_list *best_arch;
- enum arm_abi_kind arm_abi = arm_abi_global;
- enum arm_float_model fp_model = arm_fp_model;
- struct tdesc_arch_data *tdesc_data = NULL;
- int i, is_m = 0;
- int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0;
- int have_neon = 0;
- int have_fpa_registers = 1;
- const struct target_desc *tdesc = info.target_desc;
+ if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
+ {
+ /* LDM (1,2,3) where LDM (3) changes CPSR too. */
- /* If we have an object to base this architecture on, try to determine
- its ABI. */
+ if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn, 22))
+ {
+ register_bits = bits (arm_insn_r->arm_insn, 0, 15);
+ no_of_regs = 15;
+ }
+ else
+ {
+ register_bits = bits (arm_insn_r->arm_insn, 0, 14);
+ no_of_regs = 14;
+ }
+ /* Get Rn. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ record_buf[index++] = register_count;
+ register_bits = register_bits >> 1;
+ register_count++;
+ }
- if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL)
+ /* Extra space for Base Register and CPSR; wihtout optimization. */
+ record_buf[index++] = reg_src1;
+ record_buf[index++] = ARM_PS_REGNUM;
+ arm_insn_r->reg_rec_count = index;
+ }
+ else
{
- int ei_osabi, e_flags;
+ /* It handles both STM(1) and STM(2). */
+ addr_mode = bits (arm_insn_r->arm_insn, 23, 24);
+
+ register_bits = bits (arm_insn_r->arm_insn, 0, 15);
+ /* Get Rn. */
+ reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ register_count++;
+ register_bits = register_bits >> 1;
+ }
- switch (bfd_get_flavour (info.abfd))
- {
- case bfd_target_aout_flavour:
- /* Assume it's an old APCS-style ABI. */
- arm_abi = ARM_ABI_APCS;
- break;
+ switch (addr_mode)
+ {
+ /* Decrement after. */
+ case 0:
+ start_address = (u_regval[0]) - (register_count * 4) + 4;
+ arm_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ break;
+
+ /* Increment after. */
+ case 1:
+ start_address = u_regval[0];
+ arm_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ break;
+
+ /* Decrement before. */
+ case 2:
+
+ start_address = (u_regval[0]) - (register_count * 4);
+ arm_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ break;
+
+ /* Increment before. */
+ case 3:
+ start_address = u_regval[0] + 4;
+ arm_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ break;
+
+ default:
+ gdb_assert_not_reached ("no decoding pattern found");
+ break;
+ }
- case bfd_target_coff_flavour:
- /* Assume it's an old APCS-style ABI. */
- /* XXX WinCE? */
- arm_abi = ARM_ABI_APCS;
- break;
+ /* Base register also changes; based on condition and W bit. */
+ /* We save it anyway without optimization. */
+ record_buf[0] = reg_src1;
+ arm_insn_r->reg_rec_count = 1;
+ }
- case bfd_target_elf_flavour:
- ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI];
- e_flags = elf_elfheader (info.abfd)->e_flags;
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem);
+ return 0;
+}
- if (ei_osabi == ELFOSABI_ARM)
- {
- /* GNU tools used to use this value, but do not for EABI
- objects. There's nowhere to tag an EABI version
- anyway, so assume APCS. */
- arm_abi = ARM_ABI_APCS;
- }
- else if (ei_osabi == ELFOSABI_NONE)
- {
- int eabi_ver = EF_ARM_EABI_VERSION (e_flags);
- int attr_arch, attr_profile;
+/* Handling opcode 101 insns. */
- switch (eabi_ver)
- {
- case EF_ARM_EABI_UNKNOWN:
- /* Assume GNU tools. */
- arm_abi = ARM_ABI_APCS;
- break;
+static int
+arm_record_b_bl (insn_decode_record *arm_insn_r)
+{
+ uint32_t record_buf[8];
- case EF_ARM_EABI_VER4:
- case EF_ARM_EABI_VER5:
- arm_abi = ARM_ABI_AAPCS;
- /* EABI binaries default to VFP float ordering.
- They may also contain build attributes that can
- be used to identify if the VFP argument-passing
- ABI is in use. */
- if (fp_model == ARM_FLOAT_AUTO)
- {
-#ifdef HAVE_ELF
- switch (bfd_elf_get_obj_attr_int (info.abfd,
- OBJ_ATTR_PROC,
- Tag_ABI_VFP_args))
- {
- case 0:
- /* "The user intended FP parameter/result
- passing to conform to AAPCS, base
- variant". */
- fp_model = ARM_FLOAT_SOFT_VFP;
- break;
- case 1:
- /* "The user intended FP parameter/result
- passing to conform to AAPCS, VFP
- variant". */
- fp_model = ARM_FLOAT_VFP;
- break;
- case 2:
- /* "The user intended FP parameter/result
- passing to conform to tool chain-specific
- conventions" - we don't know any such
- conventions, so leave it as "auto". */
- break;
- default:
- /* Attribute value not mentioned in the
- October 2008 ABI, so leave it as
- "auto". */
- break;
- }
-#else
- fp_model = ARM_FLOAT_SOFT_VFP;
-#endif
- }
- break;
+ /* Handle B, BL, BLX(1) insns. */
+ /* B simply branches so we do nothing here. */
+ /* Note: BLX(1) doesnt fall here but instead it falls into
+ extension space. */
+ if (bit (arm_insn_r->arm_insn, 24))
+ {
+ record_buf[0] = ARM_LR_REGNUM;
+ arm_insn_r->reg_rec_count = 1;
+ }
- default:
- /* Leave it as "auto". */
- warning (_("unknown ARM EABI version 0x%x"), eabi_ver);
- break;
- }
+ REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
-#ifdef HAVE_ELF
- /* Detect M-profile programs. This only works if the
- executable file includes build attributes; GCC does
- copy them to the executable, but e.g. RealView does
- not. */
- attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC,
- Tag_CPU_arch);
- attr_profile = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC,
- Tag_CPU_arch_profile);
- /* GCC specifies the profile for v6-M; RealView only
- specifies the profile for architectures starting with
- V7 (as opposed to architectures with a tag
- numerically greater than TAG_CPU_ARCH_V7). */
- if (!tdesc_has_registers (tdesc)
- && (attr_arch == TAG_CPU_ARCH_V6_M
- || attr_arch == TAG_CPU_ARCH_V6S_M
- || attr_profile == 'M'))
- tdesc = tdesc_arm_with_m;
-#endif
- }
+ return 0;
+}
- if (fp_model == ARM_FLOAT_AUTO)
- {
- int e_flags = elf_elfheader (info.abfd)->e_flags;
+/* Handling opcode 110 insns. */
- switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT))
- {
- case 0:
- /* Leave it as "auto". Strictly speaking this case
- means FPA, but almost nobody uses that now, and
- many toolchains fail to set the appropriate bits
- for the floating-point model they use. */
- break;
- case EF_ARM_SOFT_FLOAT:
- fp_model = ARM_FLOAT_SOFT_FPA;
- break;
- case EF_ARM_VFP_FLOAT:
- fp_model = ARM_FLOAT_VFP;
- break;
- case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT:
- fp_model = ARM_FLOAT_SOFT_VFP;
- break;
- }
- }
+static int
+arm_record_coproc (insn_decode_record *arm_insn_r)
+{
+ printf_unfiltered (_("Process record does not support instruction "
+ "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
- if (e_flags & EF_ARM_BE8)
- info.byte_order_for_code = BFD_ENDIAN_LITTLE;
+ return -1;
+}
- break;
+/* Handling opcode 111 insns. */
- default:
- /* Leave it as "auto". */
- break;
- }
- }
+static int
+arm_record_coproc_data_proc (insn_decode_record *arm_insn_r)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch);
+ struct regcache *reg_cache = arm_insn_r->regcache;
+ uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */
- /* Check any target description for validity. */
- if (tdesc_has_registers (tdesc))
- {
- /* For most registers we require GDB's default names; but also allow
- the numeric names for sp / lr / pc, as a convenience. */
- static const char *const arm_sp_names[] = { "r13", "sp", NULL };
- static const char *const arm_lr_names[] = { "r14", "lr", NULL };
- static const char *const arm_pc_names[] = { "r15", "pc", NULL };
+ /* Handle SWI insn; system call would be handled over here. */
- const struct tdesc_feature *feature;
- int valid_p;
+ arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27);
+ if (15 == arm_insn_r->opcode)
+ {
+ /* Handle arm syscall insn. */
+ if (tdep->arm_swi_record != NULL)
+ {
+ ret = tdep->arm_swi_record(reg_cache);
+ }
+ else
+ {
+ printf_unfiltered (_("no syscall record support\n"));
+ ret = -1;
+ }
+ }
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.arm.core");
- if (feature == NULL)
- {
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.arm.m-profile");
- if (feature == NULL)
- return NULL;
- else
- is_m = 1;
- }
+ printf_unfiltered (_("Process record does not support instruction "
+ "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
+ paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
+ return ret;
+}
- tdesc_data = tdesc_data_alloc ();
+/* Handling opcode 000 insns. */
- valid_p = 1;
- for (i = 0; i < ARM_SP_REGNUM; i++)
- valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
- arm_register_names[i]);
- valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
- ARM_SP_REGNUM,
- arm_sp_names);
- valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
- ARM_LR_REGNUM,
- arm_lr_names);
- valid_p &= tdesc_numbered_register_choices (feature, tdesc_data,
- ARM_PC_REGNUM,
- arm_pc_names);
- if (is_m)
- valid_p &= tdesc_numbered_register (feature, tdesc_data,
- ARM_PS_REGNUM, "xpsr");
- else
- valid_p &= tdesc_numbered_register (feature, tdesc_data,
- ARM_PS_REGNUM, "cpsr");
+static int
+thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r)
+{
+ uint32_t record_buf[8];
+ uint32_t reg_src1 = 0;
- if (!valid_p)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
+ reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.arm.fpa");
- if (feature != NULL)
- {
- valid_p = 1;
- for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++)
- valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
- arm_register_names[i]);
- if (!valid_p)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
- }
- else
- have_fpa_registers = 0;
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = reg_src1;
+ thumb_insn_r->reg_rec_count = 2;
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.xscale.iwmmxt");
- if (feature != NULL)
- {
- static const char *const iwmmxt_names[] = {
- "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7",
- "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15",
- "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "",
- "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "",
- };
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+
+ return 0;
+}
- valid_p = 1;
- for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++)
- valid_p
- &= tdesc_numbered_register (feature, tdesc_data, i,
- iwmmxt_names[i - ARM_WR0_REGNUM]);
- /* Check for the control registers, but do not fail if they
- are missing. */
- for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++)
- tdesc_numbered_register (feature, tdesc_data, i,
- iwmmxt_names[i - ARM_WR0_REGNUM]);
+/* Handling opcode 001 insns. */
- for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++)
- valid_p
- &= tdesc_numbered_register (feature, tdesc_data, i,
- iwmmxt_names[i - ARM_WR0_REGNUM]);
+static int
+thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r)
+{
+ uint32_t record_buf[8];
+ uint32_t reg_src1 = 0;
- if (!valid_p)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
- }
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
- /* If we have a VFP unit, check whether the single precision registers
- are present. If not, then we will synthesize them as pseudo
- registers. */
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.arm.vfp");
- if (feature != NULL)
- {
- static const char *const vfp_double_names[] = {
- "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
- "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
- "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
- "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
- };
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = reg_src1;
+ thumb_insn_r->reg_rec_count = 2;
- /* Require the double precision registers. There must be either
- 16 or 32. */
- valid_p = 1;
- for (i = 0; i < 32; i++)
- {
- valid_p &= tdesc_numbered_register (feature, tdesc_data,
- ARM_D0_REGNUM + i,
- vfp_double_names[i]);
- if (!valid_p)
- break;
- }
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
- if (!valid_p && i != 16)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
+ return 0;
+}
- if (tdesc_unnumbered_register (feature, "s0") == 0)
- have_vfp_pseudos = 1;
+/* Handling opcode 010 insns. */
- have_vfp_registers = 1;
+static int
+thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r)
+{
+ struct regcache *reg_cache = thumb_insn_r->regcache;
+ uint32_t record_buf[8], record_buf_mem[8];
- /* If we have VFP, also check for NEON. The architecture allows
- NEON without VFP (integer vector operations only), but GDB
- does not support that. */
- feature = tdesc_find_feature (tdesc,
- "org.gnu.gdb.arm.neon");
- if (feature != NULL)
- {
- /* NEON requires 32 double-precision registers. */
- if (i != 32)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
+ uint32_t reg_src1 = 0, reg_src2 = 0;
+ uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0;
- /* If there are quad registers defined by the stub, use
- their type; otherwise (normally) provide them with
- the default type. */
- if (tdesc_unnumbered_register (feature, "q0") == 0)
- have_neon_pseudos = 1;
+ ULONGEST u_regval[2] = {0};
- have_neon = 1;
- }
- }
- }
+ opcode1 = bits (thumb_insn_r->arm_insn, 10, 12);
- /* If there is already a candidate, use it. */
- for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
- best_arch != NULL;
- best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
+ if (bit (thumb_insn_r->arm_insn, 12))
{
- if (arm_abi != ARM_ABI_AUTO
- && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi)
- continue;
+ /* Handle load/store register offset. */
+ opcode2 = bits (thumb_insn_r->arm_insn, 9, 10);
+ if (opcode2 >= 12 && opcode2 <= 15)
+ {
+ /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */
+ reg_src1 = bits (thumb_insn_r->arm_insn,0, 2);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (opcode2 >= 8 && opcode2 <= 10)
+ {
+ /* STR(2), STRB(2), STRH(2) . */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
+ reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
+ regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
+ if (8 == opcode2)
+ record_buf_mem[0] = 4; /* STR (2). */
+ else if (10 == opcode2)
+ record_buf_mem[0] = 1; /* STRB (2). */
+ else if (9 == opcode2)
+ record_buf_mem[0] = 2; /* STRH (2). */
+ record_buf_mem[1] = u_regval[0] + u_regval[1];
+ thumb_insn_r->mem_rec_count = 1;
+ }
+ }
+ else if (bit (thumb_insn_r->arm_insn, 11))
+ {
+ /* Handle load from literal pool. */
+ /* LDR(3). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (opcode1)
+ {
+ opcode2 = bits (thumb_insn_r->arm_insn, 8, 9);
+ opcode3 = bits (thumb_insn_r->arm_insn, 0, 2);
+ if ((3 == opcode2) && (!opcode3))
+ {
+ /* Branch with exchange. */
+ record_buf[0] = ARM_PS_REGNUM;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ /* Format 8; special data processing insns. */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = reg_src1;
+ thumb_insn_r->reg_rec_count = 2;
+ }
+ }
+ else
+ {
+ /* Format 5; data processing insns. */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
+ if (bit (thumb_insn_r->arm_insn, 7))
+ {
+ reg_src1 = reg_src1 + 8;
+ }
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = reg_src1;
+ thumb_insn_r->reg_rec_count = 2;
+ }
- if (fp_model != ARM_FLOAT_AUTO
- && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model)
- continue;
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
+ record_buf_mem);
- /* There are various other properties in tdep that we do not
- need to check here: those derived from a target description,
- since gdbarches with a different target description are
- automatically disqualified. */
+ return 0;
+}
- /* Do check is_m, though, since it might come from the binary. */
- if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m)
- continue;
+/* Handling opcode 001 insns. */
- /* Found a match. */
- break;
- }
+static int
+thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r)
+{
+ struct regcache *reg_cache = thumb_insn_r->regcache;
+ uint32_t record_buf[8], record_buf_mem[8];
- if (best_arch != NULL)
+ uint32_t reg_src1 = 0;
+ uint32_t opcode = 0, immed_5 = 0;
+
+ ULONGEST u_regval = 0;
+
+ opcode = bits (thumb_insn_r->arm_insn, 11, 12);
+
+ if (opcode)
{
- if (tdesc_data != NULL)
- tdesc_data_cleanup (tdesc_data);
- return best_arch->gdbarch;
+ /* LDR(1). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else
+ {
+ /* STR(1). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
+ immed_5 = bits (thumb_insn_r->arm_insn, 6, 10);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = u_regval + (immed_5 * 4);
+ thumb_insn_r->mem_rec_count = 1;
}
- tdep = xcalloc (1, sizeof (struct gdbarch_tdep));
- gdbarch = gdbarch_alloc (&info, tdep);
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
+ record_buf_mem);
- /* Record additional information about the architecture we are defining.
- These are gdbarch discriminators, like the OSABI. */
- tdep->arm_abi = arm_abi;
- tdep->fp_model = fp_model;
- tdep->is_m = is_m;
- tdep->have_fpa_registers = have_fpa_registers;
- tdep->have_vfp_registers = have_vfp_registers;
- tdep->have_vfp_pseudos = have_vfp_pseudos;
- tdep->have_neon_pseudos = have_neon_pseudos;
- tdep->have_neon = have_neon;
+ return 0;
+}
- /* Breakpoints. */
- switch (info.byte_order_for_code)
- {
- case BFD_ENDIAN_BIG:
- tdep->arm_breakpoint = arm_default_arm_be_breakpoint;
- tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint);
- tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint;
- tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint);
+/* Handling opcode 100 insns. */
- break;
+static int
+thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r)
+{
+ struct regcache *reg_cache = thumb_insn_r->regcache;
+ uint32_t record_buf[8], record_buf_mem[8];
- case BFD_ENDIAN_LITTLE:
- tdep->arm_breakpoint = arm_default_arm_le_breakpoint;
- tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint);
- tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint;
- tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint);
+ uint32_t reg_src1 = 0;
+ uint32_t opcode = 0, immed_8 = 0, immed_5 = 0;
- break;
+ ULONGEST u_regval = 0;
- default:
- internal_error (__FILE__, __LINE__,
- _("arm_gdbarch_init: bad byte order for float format"));
+ opcode = bits (thumb_insn_r->arm_insn, 11, 12);
+
+ if (3 == opcode)
+ {
+ /* LDR(4). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (1 == opcode)
+ {
+ /* LDRH(1). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (2 == opcode)
+ {
+ /* STR(3). */
+ immed_8 = bits (thumb_insn_r->arm_insn, 0, 7);
+ regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval);
+ record_buf_mem[0] = 4;
+ record_buf_mem[1] = u_regval + (immed_8 * 4);
+ thumb_insn_r->mem_rec_count = 1;
+ }
+ else if (0 == opcode)
+ {
+ /* STRH(1). */
+ immed_5 = bits (thumb_insn_r->arm_insn, 6, 10);
+ reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
+ record_buf_mem[0] = 2;
+ record_buf_mem[1] = u_regval + (immed_5 * 2);
+ thumb_insn_r->mem_rec_count = 1;
}
- /* On ARM targets char defaults to unsigned. */
- set_gdbarch_char_signed (gdbarch, 0);
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
+ record_buf_mem);
- /* Note: for displaced stepping, this includes the breakpoint, and one word
- of additional scratch space. This setting isn't used for anything beside
- displaced stepping at present. */
- set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS);
+ return 0;
+}
- /* This should be low enough for everything. */
- tdep->lowest_pc = 0x20;
- tdep->jb_pc = -1; /* Longjump support not enabled by default. */
+/* Handling opcode 101 insns. */
- /* The default, for both APCS and AAPCS, is to return small
- structures in registers. */
- tdep->struct_return = reg_struct_return;
+static int
+thumb_record_misc (insn_decode_record *thumb_insn_r)
+{
+ struct regcache *reg_cache = thumb_insn_r->regcache;
- set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call);
- set_gdbarch_frame_align (gdbarch, arm_frame_align);
+ uint32_t opcode = 0, opcode1 = 0, opcode2 = 0;
+ uint32_t register_bits = 0, register_count = 0;
+ uint32_t register_list[8] = {0}, index = 0, start_address = 0;
+ uint32_t record_buf[24], record_buf_mem[48];
+ uint32_t reg_src1;
- set_gdbarch_write_pc (gdbarch, arm_write_pc);
+ ULONGEST u_regval = 0;
- /* Frame handling. */
- set_gdbarch_dummy_id (gdbarch, arm_dummy_id);
- set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc);
- set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp);
+ opcode = bits (thumb_insn_r->arm_insn, 11, 12);
+ opcode1 = bits (thumb_insn_r->arm_insn, 8, 12);
+ opcode2 = bits (thumb_insn_r->arm_insn, 9, 12);
- frame_base_set_default (gdbarch, &arm_normal_base);
+ if (14 == opcode2)
+ {
+ /* POP. */
+ register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ record_buf[index++] = register_count;
+ register_bits = register_bits >> 1;
+ register_count++;
+ }
+ record_buf[index++] = ARM_PS_REGNUM;
+ record_buf[index++] = ARM_SP_REGNUM;
+ thumb_insn_r->reg_rec_count = index;
+ }
+ else if (10 == opcode2)
+ {
+ /* PUSH. */
+ register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
+ regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ register_count++;
+ register_bits = register_bits >> 1;
+ }
+ start_address = u_regval - \
+ (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count));
+ thumb_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ record_buf[0] = ARM_SP_REGNUM;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (0x1E == opcode1)
+ {
+ /* BKPT insn. */
+ /* Handle enhanced software breakpoint insn, BKPT. */
+ /* CPSR is changed to be executed in ARM state, disabling normal
+ interrupts, entering abort mode. */
+ /* According to high vector configuration PC is set. */
+ /* User hits breakpoint and type reverse, in that case, we need to go back with
+ previous CPSR and Program Counter. */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ thumb_insn_r->reg_rec_count = 2;
+ /* We need to save SPSR value, which is not yet done. */
+ printf_unfiltered (_("Process record does not support instruction "
+ "0x%0x at address %s.\n"),
+ thumb_insn_r->arm_insn,
+ paddress (thumb_insn_r->gdbarch,
+ thumb_insn_r->this_addr));
+ return -1;
+ }
+ else if ((0 == opcode) || (1 == opcode))
+ {
+ /* ADD(5), ADD(6). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ record_buf[0] = reg_src1;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (2 == opcode)
+ {
+ /* ADD(7), SUB(4). */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ record_buf[0] = ARM_SP_REGNUM;
+ thumb_insn_r->reg_rec_count = 1;
+ }
- /* Address manipulation. */
- set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address);
- set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove);
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
+ record_buf_mem);
- /* Advance PC across function entry code. */
- set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue);
+ return 0;
+}
- /* Detect whether PC is in function epilogue. */
- set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p);
+/* Handling opcode 110 insns. */
- /* Skip trampolines. */
- set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub);
+static int
+thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch);
+ struct regcache *reg_cache = thumb_insn_r->regcache;
- /* The stack grows downward. */
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */
+ uint32_t reg_src1 = 0;
+ uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0;
+ uint32_t register_list[8] = {0}, index = 0, start_address = 0;
+ uint32_t record_buf[24], record_buf_mem[48];
- /* Breakpoint manipulation. */
- set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc);
- set_gdbarch_remote_breakpoint_from_pc (gdbarch,
- arm_remote_breakpoint_from_pc);
+ ULONGEST u_regval = 0;
- /* Information about registers, etc. */
- set_gdbarch_deprecated_fp_regnum (gdbarch, ARM_FP_REGNUM); /* ??? */
- set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM);
- set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM);
- set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS);
- set_gdbarch_register_type (gdbarch, arm_register_type);
+ opcode1 = bits (thumb_insn_r->arm_insn, 8, 12);
+ opcode2 = bits (thumb_insn_r->arm_insn, 11, 12);
+
+ if (1 == opcode2)
+ {
+
+ /* LDMIA. */
+ register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
+ /* Get Rn. */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ record_buf[index++] = register_count;
+ register_bits = register_bits >> 1;
+ register_count++;
+ }
+ record_buf[index++] = reg_src1;
+ thumb_insn_r->reg_rec_count = index;
+ }
+ else if (0 == opcode2)
+ {
+ /* It handles both STMIA. */
+ register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
+ /* Get Rn. */
+ reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
+ regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
+ while (register_bits)
+ {
+ if (register_bits & 0x00000001)
+ register_count++;
+ register_bits = register_bits >> 1;
+ }
+ start_address = u_regval;
+ thumb_insn_r->mem_rec_count = register_count;
+ while (register_count)
+ {
+ record_buf_mem[(register_count * 2) - 1] = start_address;
+ record_buf_mem[(register_count * 2) - 2] = 4;
+ start_address = start_address + 4;
+ register_count--;
+ }
+ }
+ else if (0x1F == opcode1)
+ {
+ /* Handle arm syscall insn. */
+ if (tdep->arm_swi_record != NULL)
+ {
+ ret = tdep->arm_swi_record(reg_cache);
+ }
+ else
+ {
+ printf_unfiltered (_("no syscall record support\n"));
+ return -1;
+ }
+ }
+
+ /* B (1), conditional branch is automatically taken care in process_record,
+ as PC is saved there. */
+
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
+ MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
+ record_buf_mem);
+
+ return ret;
+}
+
+/* Handling opcode 111 insns. */
- /* This "info float" is FPA-specific. Use the generic version if we
- do not have FPA. */
- if (gdbarch_tdep (gdbarch)->have_fpa_registers)
- set_gdbarch_print_float_info (gdbarch, arm_print_float_info);
+static int
+thumb_record_branch (insn_decode_record *thumb_insn_r)
+{
+ uint32_t record_buf[8];
+ uint32_t bits_h = 0;
- /* Internal <-> external register number maps. */
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum);
- set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno);
+ bits_h = bits (thumb_insn_r->arm_insn, 11, 12);
- set_gdbarch_register_name (gdbarch, arm_register_name);
+ if (2 == bits_h || 3 == bits_h)
+ {
+ /* BL */
+ record_buf[0] = ARM_LR_REGNUM;
+ thumb_insn_r->reg_rec_count = 1;
+ }
+ else if (1 == bits_h)
+ {
+ /* BLX(1). */
+ record_buf[0] = ARM_PS_REGNUM;
+ record_buf[1] = ARM_LR_REGNUM;
+ thumb_insn_r->reg_rec_count = 2;
+ }
- /* Returning results. */
- set_gdbarch_return_value (gdbarch, arm_return_value);
+ /* B(2) is automatically taken care in process_record, as PC is
+ saved there. */
- /* Disassembly. */
- set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm);
+ REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf);
- /* Minsymbol frobbing. */
- set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special);
- set_gdbarch_coff_make_msymbol_special (gdbarch,
- arm_coff_make_msymbol_special);
- set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol);
+ return 0;
+}
- /* Thumb-2 IT block support. */
- set_gdbarch_adjust_breakpoint_address (gdbarch,
- arm_adjust_breakpoint_address);
- /* Virtual tables. */
- set_gdbarch_vbit_in_delta (gdbarch, 1);
+/* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success
+and positive val on fauilure. */
- /* Hook in the ABI-specific overrides, if they have been registered. */
- gdbarch_init_osabi (info, gdbarch);
+static int
+extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size)
+{
+ gdb_byte buf[insn_size];
- dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg);
+ memset (&buf[0], 0, insn_size);
+
+ if (target_read_memory (insn_record->this_addr, &buf[0], insn_size))
+ return 1;
+ insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0],
+ insn_size,
+ gdbarch_byte_order (insn_record->gdbarch));
+ return 0;
+}
- /* Add some default predicates. */
- frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind);
- dwarf2_append_unwinders (gdbarch);
- frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind);
+typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*);
- /* Now we have tuned the configuration, set a few final things,
- based on what the OS ABI has told us. */
+/* Decode arm/thumb insn depending on condition cods and opcodes; and
+ dispatch it. */
- /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI
- binaries are always marked. */
- if (tdep->arm_abi == ARM_ABI_AUTO)
- tdep->arm_abi = ARM_ABI_APCS;
+static int
+decode_insn (insn_decode_record *arm_record, record_type_t record_type,
+ uint32_t insn_size)
+{
- /* We used to default to FPA for generic ARM, but almost nobody
- uses that now, and we now provide a way for the user to force
- the model. So default to the most useful variant. */
- if (tdep->fp_model == ARM_FLOAT_AUTO)
- tdep->fp_model = ARM_FLOAT_SOFT_FPA;
+ /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm instruction. */
+ static const sti_arm_hdl_fp_t const arm_handle_insn[8] =
+ {
+ arm_record_data_proc_misc_ld_str, /* 000. */
+ arm_record_data_proc_imm, /* 001. */
+ arm_record_ld_st_imm_offset, /* 010. */
+ arm_record_ld_st_reg_offset, /* 011. */
+ arm_record_ld_st_multiple, /* 100. */
+ arm_record_b_bl, /* 101. */
+ arm_record_coproc, /* 110. */
+ arm_record_coproc_data_proc /* 111. */
+ };
- if (tdep->jb_pc >= 0)
- set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target);
+ /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb instruction. */
+ static const sti_arm_hdl_fp_t const thumb_handle_insn[8] =
+ { \
+ thumb_record_shift_add_sub, /* 000. */
+ thumb_record_add_sub_cmp_mov, /* 001. */
+ thumb_record_ld_st_reg_offset, /* 010. */
+ thumb_record_ld_st_imm_offset, /* 011. */
+ thumb_record_ld_st_stack, /* 100. */
+ thumb_record_misc, /* 101. */
+ thumb_record_ldm_stm_swi, /* 110. */
+ thumb_record_branch /* 111. */
+ };
- /* Floating point sizes and format. */
- set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
- if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA)
+ uint32_t ret = 0; /* return value: negative:failure 0:success. */
+ uint32_t insn_id = 0;
+
+ if (extract_arm_insn (arm_record, insn_size))
{
- set_gdbarch_double_format
- (gdbarch, floatformats_ieee_double_littlebyte_bigword);
- set_gdbarch_long_double_format
- (gdbarch, floatformats_ieee_double_littlebyte_bigword);
+ if (record_debug)
+ {
+ printf_unfiltered (_("Process record: error reading memory at "
+ "addr %s len = %d.\n"),
+ paddress (arm_record->gdbarch, arm_record->this_addr), insn_size);
+ }
+ return -1;
}
- else
+ else if (ARM_RECORD == record_type)
{
- set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
- set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
+ arm_record->cond = bits (arm_record->arm_insn, 28, 31);
+ insn_id = bits (arm_record->arm_insn, 25, 27);
+ ret = arm_record_extension_space (arm_record);
+ /* If this insn has fallen into extension space
+ then we need not decode it anymore. */
+ if (ret != -1 && !INSN_RECORDED(arm_record))
+ {
+ ret = arm_handle_insn[insn_id] (arm_record);
+ }
}
-
- if (have_vfp_pseudos)
+ else if (THUMB_RECORD == record_type)
{
- /* NOTE: These are the only pseudo registers used by
- the ARM target at the moment. If more are added, a
- little more care in numbering will be needed. */
-
- int num_pseudos = 32;
- if (have_neon_pseudos)
- num_pseudos += 16;
- set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos);
- set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read);
- set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write);
+ /* As thumb does not have condition codes, we set negative. */
+ arm_record->cond = -1;
+ insn_id = bits (arm_record->arm_insn, 13, 15);
+ ret = thumb_handle_insn[insn_id] (arm_record);
}
-
- if (tdesc_data)
+ else if (THUMB2_RECORD == record_type)
{
- set_tdesc_pseudo_register_name (gdbarch, arm_register_name);
-
- tdesc_use_registers (gdbarch, tdesc, tdesc_data);
-
- /* Override tdesc_register_type to adjust the types of VFP
- registers for NEON. */
- set_gdbarch_register_type (gdbarch, arm_register_type);
+ printf_unfiltered (_("Process record doesnt support thumb32 instruction "
+ "0x%0x at address %s.\n"),arm_record->arm_insn,
+ paddress (arm_record->gdbarch,
+ arm_record->this_addr));
+ ret = -1;
+ }
+ else
+ {
+ /* Throw assertion. */
+ gdb_assert_not_reached ("not a valid instruction, could not decode");
}
- /* Add standard register aliases. We add aliases even for those
- nanes which are used by the current architecture - it's simpler,
- and does no harm, since nothing ever lists user registers. */
- for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++)
- user_reg_add (gdbarch, arm_register_aliases[i].name,
- value_of_arm_user_reg, &arm_register_aliases[i].regnum);
-
- return gdbarch;
+ return ret;
}
-static void
-arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (tdep == NULL)
- return;
+/* Cleans up local record registers and memory allocations. */
- fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"),
- (unsigned long) tdep->lowest_pc);
+static void
+deallocate_reg_mem (insn_decode_record *record)
+{
+ xfree (record->arm_regs);
+ xfree (record->arm_mems);
}
-extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */
-
-void
-_initialize_arm_tdep (void)
-{
- struct ui_file *stb;
- long length;
- struct cmd_list_element *new_set, *new_show;
- const char *setname;
- const char *setdesc;
- const char *const *regnames;
- int numregs, i, j;
- static char *helptext;
- char regdesc[1024], *rdptr = regdesc;
- size_t rest = sizeof (regdesc);
- gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep);
+/* Parse the current instruction and record the values of the registers and
+ memory that will be changed in current instruction to record_arch_list".
+ Return -1 if something is wrong. */
- arm_objfile_data_key
- = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free);
+int
+arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
+ CORE_ADDR insn_addr)
+{
- /* Register an ELF OS ABI sniffer for ARM binaries. */
- gdbarch_register_osabi_sniffer (bfd_arch_arm,
- bfd_target_elf_flavour,
- arm_elf_osabi_sniffer);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ uint32_t no_of_rec = 0;
+ uint32_t ret = 0; /* return value: -1:record failure ; 0:success */
+ ULONGEST t_bit = 0, insn_id = 0;
- /* Initialize the standard target descriptions. */
- initialize_tdesc_arm_with_m ();
+ ULONGEST u_regval = 0;
- /* Get the number of possible sets of register names defined in opcodes. */
- num_disassembly_options = get_arm_regname_num_options ();
+ insn_decode_record arm_record;
- /* Add root prefix command for all "set arm"/"show arm" commands. */
- add_prefix_cmd ("arm", no_class, set_arm_command,
- _("Various ARM-specific commands."),
- &setarmcmdlist, "set arm ", 0, &setlist);
+ memset (&arm_record, 0, sizeof (insn_decode_record));
+ arm_record.regcache = regcache;
+ arm_record.this_addr = insn_addr;
+ arm_record.gdbarch = gdbarch;
- add_prefix_cmd ("arm", no_class, show_arm_command,
- _("Various ARM-specific commands."),
- &showarmcmdlist, "show arm ", 0, &showlist);
- /* Sync the opcode insn printer with our register viewer. */
- parse_arm_disassembler_option ("reg-names-std");
+ if (record_debug > 1)
+ {
+ fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record "
+ "addr = %s\n",
+ paddress (gdbarch, arm_record.this_addr));
+ }
- /* Initialize the array that will be passed to
- add_setshow_enum_cmd(). */
- valid_disassembly_styles
- = xmalloc ((num_disassembly_options + 1) * sizeof (char *));
- for (i = 0; i < num_disassembly_options; i++)
+ if (extract_arm_insn (&arm_record, 2))
{
- numregs = get_arm_regnames (i, &setname, &setdesc, ®names);
- valid_disassembly_styles[i] = setname;
- length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc);
- rdptr += length;
- rest -= length;
- /* When we find the default names, tell the disassembler to use
- them. */
- if (!strcmp (setname, "std"))
- {
- disassembly_style = setname;
- set_arm_regname_option (i);
- }
+ if (record_debug)
+ {
+ printf_unfiltered (_("Process record: error reading memory at "
+ "addr %s len = %d.\n"),
+ paddress (arm_record.gdbarch,
+ arm_record.this_addr), 2);
+ }
+ return -1;
}
- /* Mark the end of valid options. */
- valid_disassembly_styles[num_disassembly_options] = NULL;
- /* Create the help text. */
- stb = mem_fileopen ();
- fprintf_unfiltered (stb, "%s%s%s",
- _("The valid values are:\n"),
- regdesc,
- _("The default is \"std\"."));
- helptext = ui_file_xstrdup (stb, NULL);
- ui_file_delete (stb);
+ /* Check the insn, whether it is thumb or arm one. */
- add_setshow_enum_cmd("disassembler", no_class,
- valid_disassembly_styles, &disassembly_style,
- _("Set the disassembly style."),
- _("Show the disassembly style."),
- helptext,
- set_disassembly_style_sfunc,
- NULL, /* FIXME: i18n: The disassembly style is \"%s\". */
- &setarmcmdlist, &showarmcmdlist);
+ t_bit = arm_psr_thumb_bit (arm_record.gdbarch);
+ regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval);
- add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32,
- _("Set usage of ARM 32-bit mode."),
- _("Show usage of ARM 32-bit mode."),
- _("When off, a 26-bit PC will be used."),
- NULL,
- NULL, /* FIXME: i18n: Usage of ARM 32-bit mode is %s. */
- &setarmcmdlist, &showarmcmdlist);
- /* Add a command to allow the user to force the FPU model. */
- add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model,
- _("Set the floating point type."),
- _("Show the floating point type."),
- _("auto - Determine the FP typefrom the OS-ABI.\n\
-softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\
-fpa - FPA co-processor (GCC compiled).\n\
-softvfp - Software FP with pure-endian doubles.\n\
-vfp - VFP co-processor."),
- set_fp_model_sfunc, show_fp_model,
- &setarmcmdlist, &showarmcmdlist);
+ if (!(u_regval & t_bit))
+ {
+ /* We are decoding arm insn. */
+ ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES);
+ }
+ else
+ {
+ insn_id = bits (arm_record.arm_insn, 11, 15);
+ /* is it thumb2 insn? */
+ if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id))
+ {
+ ret = decode_insn (&arm_record, THUMB2_RECORD,
+ THUMB2_INSN_SIZE_BYTES);
+ }
+ else
+ {
+ /* We are decoding thumb insn. */
+ ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES);
+ }
+ }
- /* Add a command to allow the user to force the ABI. */
- add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string,
- _("Set the ABI."),
- _("Show the ABI."),
- NULL, arm_set_abi, arm_show_abi,
- &setarmcmdlist, &showarmcmdlist);
+ if (0 == ret)
+ {
+ /* Record registers. */
+ record_full_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM);
+ if (arm_record.arm_regs)
+ {
+ for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++)
+ {
+ if (record_full_arch_list_add_reg
+ (arm_record.regcache , arm_record.arm_regs[no_of_rec]))
+ ret = -1;
+ }
+ }
+ /* Record memories. */
+ if (arm_record.arm_mems)
+ {
+ for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++)
+ {
+ if (record_full_arch_list_add_mem
+ ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr,
+ arm_record.arm_mems[no_of_rec].len))
+ ret = -1;
+ }
+ }
- /* Add two commands to allow the user to force the assumed
- execution mode. */
- add_setshow_enum_cmd ("fallback-mode", class_support,
- arm_mode_strings, &arm_fallback_mode_string,
- _("Set the mode assumed when symbols are unavailable."),
- _("Show the mode assumed when symbols are unavailable."),
- NULL, NULL, arm_show_fallback_mode,
- &setarmcmdlist, &showarmcmdlist);
- add_setshow_enum_cmd ("force-mode", class_support,
- arm_mode_strings, &arm_force_mode_string,
- _("Set the mode assumed even when symbols are available."),
- _("Show the mode assumed even when symbols are available."),
- NULL, NULL, arm_show_force_mode,
- &setarmcmdlist, &showarmcmdlist);
+ if (record_full_arch_list_add_end ())
+ ret = -1;
+ }
- /* Debugging flag. */
- add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug,
- _("Set ARM debugging."),
- _("Show ARM debugging."),
- _("When on, arm-specific debugging is enabled."),
- NULL,
- NULL, /* FIXME: i18n: "ARM debugging is %s. */
- &setdebuglist, &showdebuglist);
+
+ deallocate_reg_mem (&arm_record);
+
+ return ret;
}
+
projects / deliverable / binutils-gdb.git / blobdiff