/* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
- Copyright (C) 1988-2012 Free Software Foundation, Inc.
+ Copyright (C) 1988-2019 Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
-#include "gdb_assert.h"
#include "frame.h"
#include "inferior.h"
#include "symtab.h"
#include "symcat.h"
#include "sim-regno.h"
#include "dis-asm.h"
+#include "disasm.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "trad-frame.h"
#include "infcall.h"
-#include "floatformat.h"
#include "remote.h"
#include "target-descriptions.h"
#include "dwarf2-frame.h"
#include "user-regs.h"
#include "valprint.h"
#include "ax.h"
-
-static const struct objfile_data *mips_pdr_data;
+#include "target-float.h"
+#include <algorithm>
static struct type *mips_register_type (struct gdbarch *gdbarch, int regnum);
+static int mips32_instruction_has_delay_slot (struct gdbarch *gdbarch,
+ ULONGEST inst);
+static int micromips_instruction_has_delay_slot (ULONGEST insn, int mustbe32);
+static int mips16_instruction_has_delay_slot (unsigned short inst,
+ int mustbe32);
+
+static int mips32_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch,
+ CORE_ADDR addr);
+static int micromips_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch,
+ CORE_ADDR addr, int mustbe32);
+static int mips16_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch,
+ CORE_ADDR addr, int mustbe32);
+
+static void mips_print_float_info (struct gdbarch *, struct ui_file *,
+ struct frame_info *, const char *);
+
/* A useful bit in the CP0 status register (MIPS_PS_REGNUM). */
/* This bit is set if we are emulating 32-bit FPRs on a 64-bit chip. */
#define ST0_FR (1 << 26)
NULL
};
+/* Enum describing the different kinds of breakpoints. */
+
+enum mips_breakpoint_kind
+{
+ /* 16-bit MIPS16 mode breakpoint. */
+ MIPS_BP_KIND_MIPS16 = 2,
+
+ /* 16-bit microMIPS mode breakpoint. */
+ MIPS_BP_KIND_MICROMIPS16 = 3,
+
+ /* 32-bit standard MIPS mode breakpoint. */
+ MIPS_BP_KIND_MIPS32 = 4,
+
+ /* 32-bit microMIPS mode breakpoint. */
+ MIPS_BP_KIND_MICROMIPS32 = 5,
+};
+
+/* For backwards compatibility we default to MIPS16. This flag is
+ overridden as soon as unambiguous ELF file flags tell us the
+ compressed ISA encoding used. */
+static const char mips_compression_mips16[] = "mips16";
+static const char mips_compression_micromips[] = "micromips";
+static const char *const mips_compression_strings[] =
+{
+ mips_compression_mips16,
+ mips_compression_micromips,
+ NULL
+};
+
+static const char *mips_compression_string = mips_compression_mips16;
+
/* The standard register names, and all the valid aliases for them. */
struct register_alias
{
static int mips_fpu_type_auto = 1;
static enum mips_fpu_type mips_fpu_type = MIPS_DEFAULT_FPU_TYPE;
-static int mips_debug = 0;
+static unsigned int mips_debug = 0;
/* Properties (for struct target_desc) describing the g/G packet
layout. */
struct target_desc *mips_tdesc_gp32;
struct target_desc *mips_tdesc_gp64;
+/* The current set of options to be passed to the disassembler. */
+static char *mips_disassembler_options;
+
+/* Implicit disassembler options for individual ABIs. These tell
+ libopcodes to use general-purpose register names corresponding
+ to the ABI we have selected, perhaps via a `set mips abi ...'
+ override, rather than ones inferred from the ABI set in the ELF
+ headers of the binary file selected for debugging. */
+static const char mips_disassembler_options_o32[] = "gpr-names=32";
+static const char mips_disassembler_options_n32[] = "gpr-names=n32";
+static const char mips_disassembler_options_n64[] = "gpr-names=64";
+
const struct mips_regnum *
mips_regnum (struct gdbarch *gdbarch)
{
/ gdbarch_bfd_arch_info (gdbarch)->bits_per_byte);
}
+/* Max saved register size. */
+#define MAX_MIPS_ABI_REGSIZE 8
+
/* Return the currently configured (or set) saved register size. */
unsigned int
}
}
-/* MIPS16 function addresses are odd (bit 0 is set). Here are some
- functions to test, set, or clear bit 0 of addresses. */
+/* MIPS16/microMIPS function addresses are odd (bit 0 is set). Here
+ are some functions to handle addresses associated with compressed
+ code including but not limited to testing, setting, or clearing
+ bit 0 of such addresses. */
-static CORE_ADDR
-is_mips16_addr (CORE_ADDR addr)
+/* Return one iff compressed code is the MIPS16 instruction set. */
+
+static int
+is_mips16_isa (struct gdbarch *gdbarch)
+{
+ return gdbarch_tdep (gdbarch)->mips_isa == ISA_MIPS16;
+}
+
+/* Return one iff compressed code is the microMIPS instruction set. */
+
+static int
+is_micromips_isa (struct gdbarch *gdbarch)
+{
+ return gdbarch_tdep (gdbarch)->mips_isa == ISA_MICROMIPS;
+}
+
+/* Return one iff ADDR denotes compressed code. */
+
+static int
+is_compact_addr (CORE_ADDR addr)
{
return ((addr) & 1);
}
+/* Return one iff ADDR denotes standard ISA code. */
+
+static int
+is_mips_addr (CORE_ADDR addr)
+{
+ return !is_compact_addr (addr);
+}
+
+/* Return one iff ADDR denotes MIPS16 code. */
+
+static int
+is_mips16_addr (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+ return is_compact_addr (addr) && is_mips16_isa (gdbarch);
+}
+
+/* Return one iff ADDR denotes microMIPS code. */
+
+static int
+is_micromips_addr (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+ return is_compact_addr (addr) && is_micromips_isa (gdbarch);
+}
+
+/* Strip the ISA (compression) bit off from ADDR. */
+
static CORE_ADDR
-unmake_mips16_addr (CORE_ADDR addr)
+unmake_compact_addr (CORE_ADDR addr)
{
return ((addr) & ~(CORE_ADDR) 1);
}
+/* Add the ISA (compression) bit to ADDR. */
+
static CORE_ADDR
-make_mips16_addr (CORE_ADDR addr)
+make_compact_addr (CORE_ADDR addr)
{
return ((addr) | (CORE_ADDR) 1);
}
+/* Extern version of unmake_compact_addr; we use a separate function
+ so that unmake_compact_addr can be inlined throughout this file. */
+
+CORE_ADDR
+mips_unmake_compact_addr (CORE_ADDR addr)
+{
+ return unmake_compact_addr (addr);
+}
+
/* Functions for setting and testing a bit in a minimal symbol that
- marks it as 16-bit function. The MSB of the minimal symbol's
- "info" field is used for this purpose.
+ marks it as MIPS16 or microMIPS function. The MSB of the minimal
+ symbol's "info" field is used for this purpose.
- gdbarch_elf_make_msymbol_special tests whether an ELF symbol is "special",
- i.e. refers to a 16-bit function, and sets a "special" bit in a
- minimal symbol to mark it as a 16-bit function
+ gdbarch_elf_make_msymbol_special tests whether an ELF symbol is
+ "special", i.e. refers to a MIPS16 or microMIPS function, and sets
+ one of the "special" bits in a minimal symbol to mark it accordingly.
+ The test checks an ELF-private flag that is valid for true function
+ symbols only; for synthetic symbols such as for PLT stubs that have
+ no ELF-private part at all the MIPS BFD backend arranges for this
+ information to be carried in the asymbol's udata field instead.
- MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol */
+ msymbol_is_mips16 and msymbol_is_micromips test the "special" bit
+ in a minimal symbol. */
static void
mips_elf_make_msymbol_special (asymbol * sym, struct minimal_symbol *msym)
{
- if (ELF_ST_IS_MIPS16 (((elf_symbol_type *)
- (sym))->internal_elf_sym.st_other))
+ elf_symbol_type *elfsym = (elf_symbol_type *) sym;
+ unsigned char st_other;
+
+ if ((sym->flags & BSF_SYNTHETIC) == 0)
+ st_other = elfsym->internal_elf_sym.st_other;
+ else if ((sym->flags & BSF_FUNCTION) != 0)
+ st_other = sym->udata.i;
+ else
+ return;
+
+ if (ELF_ST_IS_MICROMIPS (st_other))
+ {
+ MSYMBOL_TARGET_FLAG_MICROMIPS (msym) = 1;
+ SET_MSYMBOL_VALUE_ADDRESS (msym, MSYMBOL_VALUE_RAW_ADDRESS (msym) | 1);
+ }
+ else if (ELF_ST_IS_MIPS16 (st_other))
{
- MSYMBOL_TARGET_FLAG_1 (msym) = 1;
+ MSYMBOL_TARGET_FLAG_MIPS16 (msym) = 1;
+ SET_MSYMBOL_VALUE_ADDRESS (msym, MSYMBOL_VALUE_RAW_ADDRESS (msym) | 1);
}
}
+/* Return one iff MSYM refers to standard ISA code. */
+
+static int
+msymbol_is_mips (struct minimal_symbol *msym)
+{
+ return !(MSYMBOL_TARGET_FLAG_MIPS16 (msym)
+ | MSYMBOL_TARGET_FLAG_MICROMIPS (msym));
+}
+
+/* Return one iff MSYM refers to MIPS16 code. */
+
+static int
+msymbol_is_mips16 (struct minimal_symbol *msym)
+{
+ return MSYMBOL_TARGET_FLAG_MIPS16 (msym);
+}
+
+/* Return one iff MSYM refers to microMIPS code. */
+
static int
-msymbol_is_special (struct minimal_symbol *msym)
+msymbol_is_micromips (struct minimal_symbol *msym)
+{
+ return MSYMBOL_TARGET_FLAG_MICROMIPS (msym);
+}
+
+/* Set the ISA bit in the main symbol too, complementing the corresponding
+ minimal symbol setting and reflecting the run-time value of the symbol.
+ The need for comes from the ISA bit having been cleared as code in
+ `_bfd_mips_elf_symbol_processing' separated it into the ELF symbol's
+ `st_other' STO_MIPS16 or STO_MICROMIPS annotation, making the values
+ of symbols referring to compressed code different in GDB to the values
+ used by actual code. That in turn makes them evaluate incorrectly in
+ expressions, producing results different to what the same expressions
+ yield when compiled into the program being debugged. */
+
+static void
+mips_make_symbol_special (struct symbol *sym, struct objfile *objfile)
{
- return MSYMBOL_TARGET_FLAG_1 (msym);
+ if (SYMBOL_CLASS (sym) == LOC_BLOCK)
+ {
+ /* We are in symbol reading so it is OK to cast away constness. */
+ struct block *block = (struct block *) SYMBOL_BLOCK_VALUE (sym);
+ CORE_ADDR compact_block_start;
+ struct bound_minimal_symbol msym;
+
+ compact_block_start = BLOCK_START (block) | 1;
+ msym = lookup_minimal_symbol_by_pc (compact_block_start);
+ if (msym.minsym && !msymbol_is_mips (msym.minsym))
+ {
+ BLOCK_START (block) = compact_block_start;
+ }
+ }
}
/* XFER a value from the big/little/left end of the register.
fprintf_unfiltered (gdb_stdlog, "%02x", out[buf_offset + i]);
}
if (in != NULL)
- regcache_cooked_read_part (regcache, reg_num, reg_offset, length,
- in + buf_offset);
+ regcache->cooked_read_part (reg_num, reg_offset, length, in + buf_offset);
if (out != NULL)
- regcache_cooked_write_part (regcache, reg_num, reg_offset, length,
- out + buf_offset);
+ regcache->cooked_write_part (reg_num, reg_offset, length, out + buf_offset);
if (mips_debug && in != NULL)
{
int i;
static CORE_ADDR heuristic_proc_start (struct gdbarch *, CORE_ADDR);
-static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *);
-
/* The list of available "set mips " and "show mips " commands. */
static struct cmd_list_element *setmipscmdlist = NULL;
"fsr", "fir",
};
-/* Names of IDT R3041 registers. */
-
-static const char *mips_r3041_reg_names[] = {
- "sr", "lo", "hi", "bad", "cause", "pc",
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
- "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
- "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
- "fsr", "fir", "", /*"fp" */ "",
- "", "", "bus", "ccfg", "", "", "", "",
- "", "", "port", "cmp", "", "", "epc", "prid",
-};
-
/* Names of tx39 registers. */
static const char *mips_tx39_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
"", "", "config", "cache", "debug", "depc", "epc",
};
-/* Names of IRIX registers. */
-static const char *mips_irix_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
- "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
- "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
- "pc", "cause", "bad", "hi", "lo", "fsr", "fir"
-};
-
/* Names of registers with Linux kernels. */
static const char *mips_linux_reg_names[NUM_MIPS_PROCESSOR_REGS] = {
"sr", "lo", "hi", "bad", "cause", "pc",
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* GPR names for all ABIs other than n32/n64. */
- static char *mips_gpr_names[] = {
+ static const char *mips_gpr_names[] = {
"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
};
/* GPR names for n32 and n64 ABIs. */
- static char *mips_n32_n64_gpr_names[] = {
+ static const char *mips_n32_n64_gpr_names[] = {
"zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
registers. Take care of alignment and size problems. */
static enum register_status
-mips_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+mips_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
int cookednum, gdb_byte *buf)
{
int rawnum = cookednum % gdbarch_num_regs (gdbarch);
gdb_assert (cookednum >= gdbarch_num_regs (gdbarch)
&& cookednum < 2 * gdbarch_num_regs (gdbarch));
if (register_size (gdbarch, rawnum) == register_size (gdbarch, cookednum))
- return regcache_raw_read (regcache, rawnum, buf);
+ return regcache->raw_read (rawnum, buf);
else if (register_size (gdbarch, rawnum) >
register_size (gdbarch, cookednum))
{
if (gdbarch_tdep (gdbarch)->mips64_transfers_32bit_regs_p)
- return regcache_raw_read_part (regcache, rawnum, 0, 4, buf);
+ return regcache->raw_read_part (rawnum, 0, 4, buf);
else
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
LONGEST regval;
enum register_status status;
- status = regcache_raw_read_signed (regcache, rawnum, ®val);
+ status = regcache->raw_read (rawnum, ®val);
if (status == REG_VALID)
store_signed_integer (buf, 4, byte_order, regval);
return status;
gdb_assert (cookednum >= gdbarch_num_regs (gdbarch)
&& cookednum < 2 * gdbarch_num_regs (gdbarch));
if (register_size (gdbarch, rawnum) == register_size (gdbarch, cookednum))
- regcache_raw_write (regcache, rawnum, buf);
+ regcache->raw_write (rawnum, buf);
else if (register_size (gdbarch, rawnum) >
register_size (gdbarch, cookednum))
{
if (gdbarch_tdep (gdbarch)->mips64_transfers_32bit_regs_p)
- regcache_raw_write_part (regcache, rawnum, 0, 4, buf);
+ regcache->raw_write_part (rawnum, 0, 4, buf);
else
{
/* Sign extend the shortened version of the register prior
return 0;
}
-/* Table to translate MIPS16 register field to actual register number. */
-static int mips16_to_32_reg[8] = { 16, 17, 2, 3, 4, 5, 6, 7 };
+/* Table to translate 3-bit register field to actual register number. */
+static const signed char mips_reg3_to_reg[8] = { 16, 17, 2, 3, 4, 5, 6, 7 };
/* Heuristic_proc_start may hunt through the text section for a long
time across a 2400 baud serial line. Allows the user to limit this
search. */
-static unsigned int heuristic_fence_post = 0;
+static int heuristic_fence_post = 0;
/* Number of bytes of storage in the actual machine representation for
register N. NOTE: This defines the pseudo register type so need to
rebuild the architecture vector. */
-static int mips64_transfers_32bit_regs_p = 0;
+static bool mips64_transfers_32bit_regs_p = false;
static void
-set_mips64_transfers_32bit_regs (char *args, int from_tty,
+set_mips64_transfers_32bit_regs (const char *args, int from_tty,
struct cmd_list_element *c)
{
struct gdbarch_info info;
mips_convert_register_p (struct gdbarch *gdbarch,
int regnum, struct type *type)
{
- return mips_convert_register_float_case_p (gdbarch, regnum, type)
- || mips_convert_register_gpreg_case_p (gdbarch, regnum, type);
+ return (mips_convert_register_float_case_p (gdbarch, regnum, type)
+ || mips_convert_register_gpreg_case_p (gdbarch, regnum, type));
}
static int
if (rawnum == mips_regnum (gdbarch)->fp_control_status
|| rawnum == mips_regnum (gdbarch)->fp_implementation_revision)
return builtin_type (gdbarch)->builtin_int32;
- else if (gdbarch_osabi (gdbarch) != GDB_OSABI_IRIX
- && gdbarch_osabi (gdbarch) != GDB_OSABI_LINUX
+ else if (gdbarch_osabi (gdbarch) != GDB_OSABI_LINUX
&& rawnum >= MIPS_FIRST_EMBED_REGNUM
&& rawnum <= MIPS_LAST_EMBED_REGNUM)
/* The pseudo/cooked view of the embedded registers is always
mips_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
{
const int num_regs = gdbarch_num_regs (gdbarch);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
int rawnum = regnum % num_regs;
struct type *rawtype;
if (TYPE_LENGTH (rawtype) == 0)
return rawtype;
- if (rawnum >= mips_regnum (gdbarch)->fp0
- && rawnum < mips_regnum (gdbarch)->fp0 + 32)
- /* Present the floating point registers however the hardware did;
- do not try to convert between FPU layouts. */
+ /* Present the floating point registers however the hardware did;
+ do not try to convert between FPU layouts. */
+ if (mips_float_register_p (gdbarch, rawnum))
return rawtype;
+ /* Floating-point control registers are always 32-bit even though for
+ backwards compatibility reasons 64-bit targets will transfer them
+ as 64-bit quantities even if using XML descriptions. */
+ if (rawnum == mips_regnum (gdbarch)->fp_control_status
+ || rawnum == mips_regnum (gdbarch)->fp_implementation_revision)
+ return builtin_type (gdbarch)->builtin_int32;
+
/* Use pointer types for registers if we can. For n32 we can not,
since we do not have a 64-bit pointer type. */
if (mips_abi_regsize (gdbarch)
&& rawnum < mips_regnum (gdbarch)->dspacc + 6)))
return builtin_type (gdbarch)->builtin_int32;
- if (gdbarch_osabi (gdbarch) != GDB_OSABI_IRIX
- && gdbarch_osabi (gdbarch) != GDB_OSABI_LINUX
- && rawnum >= MIPS_EMBED_FP0_REGNUM + 32
+ /* The pseudo/cooked view of embedded registers is always
+ 32-bit, even if the target transfers 64-bit values for them.
+ New targets relying on XML descriptions should only transfer
+ the necessary 32 bits, but older versions of GDB expected 64,
+ so allow the target to provide 64 bits without interfering
+ with the displayed type. */
+ if (gdbarch_osabi (gdbarch) != GDB_OSABI_LINUX
+ && rawnum >= MIPS_FIRST_EMBED_REGNUM
&& rawnum <= MIPS_LAST_EMBED_REGNUM)
- {
- /* The pseudo/cooked view of embedded registers is always
- 32-bit, even if the target transfers 64-bit values for them.
- New targets relying on XML descriptions should only transfer
- the necessary 32 bits, but older versions of GDB expected 64,
- so allow the target to provide 64 bits without interfering
- with the displayed type. */
- return builtin_type (gdbarch)->builtin_int32;
- }
+ return builtin_type (gdbarch)->builtin_int32;
/* For all other registers, pass through the hardware type. */
return rawtype;
}
/* Should the upper word of 64-bit addresses be zeroed? */
-enum auto_boolean mask_address_var = AUTO_BOOLEAN_AUTO;
+static enum auto_boolean mask_address_var = AUTO_BOOLEAN_AUTO;
static int
mips_mask_address_p (struct gdbarch_tdep *tdep)
show_mask_address (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
deprecated_show_value_hack (file, from_tty, c, value);
switch (mask_address_var)
}
}
+/* Tell if the program counter value in MEMADDR is in a standard ISA
+ function. */
+
+int
+mips_pc_is_mips (CORE_ADDR memaddr)
+{
+ struct bound_minimal_symbol sym;
+
+ /* Flags indicating that this is a MIPS16 or microMIPS function is
+ stored by elfread.c in the high bit of the info field. Use this
+ to decide if the function is standard MIPS. Otherwise if bit 0
+ of the address is clear, then this is a standard MIPS function. */
+ sym = lookup_minimal_symbol_by_pc (make_compact_addr (memaddr));
+ if (sym.minsym)
+ return msymbol_is_mips (sym.minsym);
+ else
+ return is_mips_addr (memaddr);
+}
+
/* Tell if the program counter value in MEMADDR is in a MIPS16 function. */
int
-mips_pc_is_mips16 (CORE_ADDR memaddr)
+mips_pc_is_mips16 (struct gdbarch *gdbarch, CORE_ADDR memaddr)
{
- struct minimal_symbol *sym;
+ struct bound_minimal_symbol sym;
/* A flag indicating that this is a MIPS16 function is stored by
elfread.c in the high bit of the info field. Use this to decide
- if the function is MIPS16 or normal MIPS. Otherwise if bit 0 of
- the address is set, assume this is a MIPS16 address. */
- sym = lookup_minimal_symbol_by_pc (memaddr);
- if (sym)
- return msymbol_is_special (sym);
+ if the function is MIPS16. Otherwise if bit 0 of the address is
+ set, then ELF file flags will tell if this is a MIPS16 function. */
+ sym = lookup_minimal_symbol_by_pc (make_compact_addr (memaddr));
+ if (sym.minsym)
+ return msymbol_is_mips16 (sym.minsym);
+ else
+ return is_mips16_addr (gdbarch, memaddr);
+}
+
+/* Tell if the program counter value in MEMADDR is in a microMIPS function. */
+
+int
+mips_pc_is_micromips (struct gdbarch *gdbarch, CORE_ADDR memaddr)
+{
+ struct bound_minimal_symbol sym;
+
+ /* A flag indicating that this is a microMIPS function is stored by
+ elfread.c in the high bit of the info field. Use this to decide
+ if the function is microMIPS. Otherwise if bit 0 of the address
+ is set, then ELF file flags will tell if this is a microMIPS
+ function. */
+ sym = lookup_minimal_symbol_by_pc (make_compact_addr (memaddr));
+ if (sym.minsym)
+ return msymbol_is_micromips (sym.minsym);
+ else
+ return is_micromips_addr (gdbarch, memaddr);
+}
+
+/* Tell the ISA type of the function the program counter value in MEMADDR
+ is in. */
+
+static enum mips_isa
+mips_pc_isa (struct gdbarch *gdbarch, CORE_ADDR memaddr)
+{
+ struct bound_minimal_symbol sym;
+
+ /* A flag indicating that this is a MIPS16 or a microMIPS function
+ is stored by elfread.c in the high bit of the info field. Use
+ this to decide if the function is MIPS16 or microMIPS or normal
+ MIPS. Otherwise if bit 0 of the address is set, then ELF file
+ flags will tell if this is a MIPS16 or a microMIPS function. */
+ sym = lookup_minimal_symbol_by_pc (make_compact_addr (memaddr));
+ if (sym.minsym)
+ {
+ if (msymbol_is_micromips (sym.minsym))
+ return ISA_MICROMIPS;
+ else if (msymbol_is_mips16 (sym.minsym))
+ return ISA_MIPS16;
+ else
+ return ISA_MIPS;
+ }
else
- return is_mips16_addr (memaddr);
+ {
+ if (is_mips_addr (memaddr))
+ return ISA_MIPS;
+ else if (is_micromips_addr (gdbarch, memaddr))
+ return ISA_MICROMIPS;
+ else
+ return ISA_MIPS16;
+ }
+}
+
+/* Set the ISA bit correctly in the PC, used by DWARF-2 machinery.
+ The need for comes from the ISA bit having been cleared, making
+ addresses in FDE, range records, etc. referring to compressed code
+ different to those in line information, the symbol table and finally
+ the PC register. That in turn confuses many operations. */
+
+static CORE_ADDR
+mips_adjust_dwarf2_addr (CORE_ADDR pc)
+{
+ pc = unmake_compact_addr (pc);
+ return mips_pc_is_mips (pc) ? pc : make_compact_addr (pc);
+}
+
+/* Recalculate the line record requested so that the resulting PC has
+ the ISA bit set correctly, used by DWARF-2 machinery. The need for
+ this adjustment comes from some records associated with compressed
+ code having the ISA bit cleared, most notably at function prologue
+ ends. The ISA bit is in this context retrieved from the minimal
+ symbol covering the address requested, which in turn has been
+ constructed from the binary's symbol table rather than DWARF-2
+ information. The correct setting of the ISA bit is required for
+ breakpoint addresses to correctly match against the stop PC.
+
+ As line entries can specify relative address adjustments we need to
+ keep track of the absolute value of the last line address recorded
+ in line information, so that we can calculate the actual address to
+ apply the ISA bit adjustment to. We use PC for this tracking and
+ keep the original address there.
+
+ As such relative address adjustments can be odd within compressed
+ code we need to keep track of the last line address with the ISA
+ bit adjustment applied too, as the original address may or may not
+ have had the ISA bit set. We use ADJ_PC for this tracking and keep
+ the adjusted address there.
+
+ For relative address adjustments we then use these variables to
+ calculate the address intended by line information, which will be
+ PC-relative, and return an updated adjustment carrying ISA bit
+ information, which will be ADJ_PC-relative. For absolute address
+ adjustments we just return the same address that we store in ADJ_PC
+ too.
+
+ As the first line entry can be relative to an implied address value
+ of 0 we need to have the initial address set up that we store in PC
+ and ADJ_PC. This is arranged with a call from `dwarf_decode_lines_1'
+ that sets PC to 0 and ADJ_PC accordingly, usually 0 as well. */
+
+static CORE_ADDR
+mips_adjust_dwarf2_line (CORE_ADDR addr, int rel)
+{
+ static CORE_ADDR adj_pc;
+ static CORE_ADDR pc;
+ CORE_ADDR isa_pc;
+
+ pc = rel ? pc + addr : addr;
+ isa_pc = mips_adjust_dwarf2_addr (pc);
+ addr = rel ? isa_pc - adj_pc : isa_pc;
+ adj_pc = isa_pc;
+ return addr;
}
/* Various MIPS16 thunk (aka stub or trampoline) names. */
return 0;
/* If the PC is in __mips16_call_stub_*, this is a call/return stub. */
- if (strncmp (name, mips_str_mips16_call_stub,
- strlen (mips_str_mips16_call_stub)) == 0)
+ if (startswith (name, mips_str_mips16_call_stub))
return 1;
/* If the PC is in __call_stub_*, this is a call/return or a call stub. */
- if (strncmp (name, mips_str_call_stub, strlen (mips_str_call_stub)) == 0)
+ if (startswith (name, mips_str_call_stub))
return 1;
/* If the PC is in __fn_stub_*, this is a call stub. */
- if (strncmp (name, mips_str_fn_stub, strlen (mips_str_fn_stub)) == 0)
+ if (startswith (name, mips_str_fn_stub))
return 1;
return 0; /* Not a stub. */
all registers should be sign extended for simplicity? */
static CORE_ADDR
-mips_read_pc (struct regcache *regcache)
+mips_read_pc (readable_regcache *regcache)
{
- int regnum = gdbarch_pc_regnum (get_regcache_arch (regcache));
- ULONGEST pc;
+ int regnum = gdbarch_pc_regnum (regcache->arch ());
+ LONGEST pc;
- regcache_cooked_read_signed (regcache, regnum, &pc);
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
+ regcache->cooked_read (regnum, &pc);
return pc;
}
CORE_ADDR pc;
pc = frame_unwind_register_signed (next_frame, gdbarch_pc_regnum (gdbarch));
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
/* macro/2012-04-20: This hack skips over MIPS16 call thunks as
intermediate frames. In this case we can get the caller's address
from $ra, or if $ra contains an address within a thunk as well, then
{
pc = frame_unwind_register_signed
(next_frame, gdbarch_num_regs (gdbarch) + MIPS_RA_REGNUM);
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
if (mips_in_frame_stub (pc))
- {
- pc = frame_unwind_register_signed
- (next_frame, gdbarch_num_regs (gdbarch) + MIPS_S2_REGNUM);
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
- }
+ pc = frame_unwind_register_signed
+ (next_frame, gdbarch_num_regs (gdbarch) + MIPS_S2_REGNUM);
}
return pc;
}
void
mips_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- int regnum = gdbarch_pc_regnum (get_regcache_arch (regcache));
+ int regnum = gdbarch_pc_regnum (regcache->arch ());
- if (mips_pc_is_mips16 (pc))
- regcache_cooked_write_unsigned (regcache, regnum, make_mips16_addr (pc));
- else
- regcache_cooked_write_unsigned (regcache, regnum, pc);
+ regcache_cooked_write_unsigned (regcache, regnum, pc);
}
-/* Fetch and return instruction from the specified location. If the PC
- is odd, assume it's a MIPS16 instruction; otherwise MIPS32. */
+/* Fetch and return instruction from the specified location. Handle
+ MIPS16/microMIPS as appropriate. */
static ULONGEST
-mips_fetch_instruction (struct gdbarch *gdbarch, CORE_ADDR addr)
+mips_fetch_instruction (struct gdbarch *gdbarch,
+ enum mips_isa isa, CORE_ADDR addr, int *errp)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[MIPS_INSN32_SIZE];
int instlen;
- int status;
+ int err;
- if (mips_pc_is_mips16 (addr))
+ switch (isa)
{
+ case ISA_MICROMIPS:
+ case ISA_MIPS16:
instlen = MIPS_INSN16_SIZE;
- addr = unmake_mips16_addr (addr);
+ addr = unmake_compact_addr (addr);
+ break;
+ case ISA_MIPS:
+ instlen = MIPS_INSN32_SIZE;
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid ISA"));
+ break;
+ }
+ err = target_read_memory (addr, buf, instlen);
+ if (errp != NULL)
+ *errp = err;
+ if (err != 0)
+ {
+ if (errp == NULL)
+ memory_error (TARGET_XFER_E_IO, addr);
+ return 0;
}
- else
- instlen = MIPS_INSN32_SIZE;
- status = target_read_memory (addr, buf, instlen);
- if (status)
- memory_error (status, addr);
return extract_unsigned_integer (buf, instlen, byte_order);
}
#define rtype_shamt(x) ((x >> 6) & 0x1f)
#define rtype_funct(x) (x & 0x3f)
+/* MicroMIPS instruction fields. */
+#define micromips_op(x) ((x) >> 10)
+
+/* 16-bit/32-bit-high-part instruction formats, B and S refer to the lowest
+ bit and the size respectively of the field extracted. */
+#define b0s4_imm(x) ((x) & 0xf)
+#define b0s5_imm(x) ((x) & 0x1f)
+#define b0s5_reg(x) ((x) & 0x1f)
+#define b0s7_imm(x) ((x) & 0x7f)
+#define b0s10_imm(x) ((x) & 0x3ff)
+#define b1s4_imm(x) (((x) >> 1) & 0xf)
+#define b1s9_imm(x) (((x) >> 1) & 0x1ff)
+#define b2s3_cc(x) (((x) >> 2) & 0x7)
+#define b4s2_regl(x) (((x) >> 4) & 0x3)
+#define b5s5_op(x) (((x) >> 5) & 0x1f)
+#define b5s5_reg(x) (((x) >> 5) & 0x1f)
+#define b6s4_op(x) (((x) >> 6) & 0xf)
+#define b7s3_reg(x) (((x) >> 7) & 0x7)
+
+/* 32-bit instruction formats, B and S refer to the lowest bit and the size
+ respectively of the field extracted. */
+#define b0s6_op(x) ((x) & 0x3f)
+#define b0s11_op(x) ((x) & 0x7ff)
+#define b0s12_imm(x) ((x) & 0xfff)
+#define b0s16_imm(x) ((x) & 0xffff)
+#define b0s26_imm(x) ((x) & 0x3ffffff)
+#define b6s10_ext(x) (((x) >> 6) & 0x3ff)
+#define b11s5_reg(x) (((x) >> 11) & 0x1f)
+#define b12s4_op(x) (((x) >> 12) & 0xf)
+
+/* Return the size in bytes of the instruction INSN encoded in the ISA
+ instruction set. */
+
+static int
+mips_insn_size (enum mips_isa isa, ULONGEST insn)
+{
+ switch (isa)
+ {
+ case ISA_MICROMIPS:
+ if ((micromips_op (insn) & 0x4) == 0x4
+ || (micromips_op (insn) & 0x7) == 0x0)
+ return 2 * MIPS_INSN16_SIZE;
+ else
+ return MIPS_INSN16_SIZE;
+ case ISA_MIPS16:
+ if ((insn & 0xf800) == 0xf000)
+ return 2 * MIPS_INSN16_SIZE;
+ else
+ return MIPS_INSN16_SIZE;
+ case ISA_MIPS:
+ return MIPS_INSN32_SIZE;
+ }
+ internal_error (__FILE__, __LINE__, _("invalid ISA"));
+}
+
static LONGEST
mips32_relative_offset (ULONGEST inst)
{
number of the floating condition bits tested by the branch. */
static CORE_ADDR
-mips32_bc1_pc (struct gdbarch *gdbarch, struct frame_info *frame,
+mips32_bc1_pc (struct gdbarch *gdbarch, struct regcache *regcache,
ULONGEST inst, CORE_ADDR pc, int count)
{
int fcsr = mips_regnum (gdbarch)->fp_control_status;
/* No way to handle; it'll most likely trap anyway. */
return pc;
- fcs = get_frame_register_unsigned (frame, fcsr);
+ fcs = regcache_raw_get_unsigned (regcache, fcsr);
cond = ((fcs >> 24) & 0xfe) | ((fcs >> 23) & 0x01);
if (((cond >> cnum) & mask) != mask * !tf)
return pc;
}
+/* Return nonzero if the gdbarch is an Octeon series. */
+
+static int
+is_octeon (struct gdbarch *gdbarch)
+{
+ const struct bfd_arch_info *info = gdbarch_bfd_arch_info (gdbarch);
+
+ return (info->mach == bfd_mach_mips_octeon
+ || info->mach == bfd_mach_mips_octeonp
+ || info->mach == bfd_mach_mips_octeon2);
+}
+
+/* Return true if the OP represents the Octeon's BBIT instruction. */
+
+static int
+is_octeon_bbit_op (int op, struct gdbarch *gdbarch)
+{
+ if (!is_octeon (gdbarch))
+ return 0;
+ /* BBIT0 is encoded as LWC2: 110 010. */
+ /* BBIT032 is encoded as LDC2: 110 110. */
+ /* BBIT1 is encoded as SWC2: 111 010. */
+ /* BBIT132 is encoded as SDC2: 111 110. */
+ if (op == 50 || op == 54 || op == 58 || op == 62)
+ return 1;
+ return 0;
+}
+
+
/* Determine where to set a single step breakpoint while considering
branch prediction. */
+
static CORE_ADDR
-mips32_next_pc (struct frame_info *frame, CORE_ADDR pc)
+mips32_next_pc (struct regcache *regcache, CORE_ADDR pc)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
unsigned long inst;
int op;
- inst = mips_fetch_instruction (gdbarch, pc);
+ inst = mips_fetch_instruction (gdbarch, ISA_MIPS, pc, NULL);
+ op = itype_op (inst);
if ((inst & 0xe0000000) != 0) /* Not a special, jump or branch
instruction. */
{
- if (itype_op (inst) >> 2 == 5)
+ if (op >> 2 == 5)
/* BEQL, BNEL, BLEZL, BGTZL: bits 0101xx */
{
- op = (itype_op (inst) & 0x03);
- switch (op)
+ switch (op & 0x03)
{
case 0: /* BEQL */
goto equal_branch;
pc += 4;
}
}
- else if (itype_op (inst) == 17 && itype_rs (inst) == 8)
+ else if (op == 17 && itype_rs (inst) == 8)
/* BC1F, BC1FL, BC1T, BC1TL: 010001 01000 */
- pc = mips32_bc1_pc (gdbarch, frame, inst, pc + 4, 1);
- else if (itype_op (inst) == 17 && itype_rs (inst) == 9
+ pc = mips32_bc1_pc (gdbarch, regcache, inst, pc + 4, 1);
+ else if (op == 17 && itype_rs (inst) == 9
&& (itype_rt (inst) & 2) == 0)
/* BC1ANY2F, BC1ANY2T: 010001 01001 xxx0x */
- pc = mips32_bc1_pc (gdbarch, frame, inst, pc + 4, 2);
- else if (itype_op (inst) == 17 && itype_rs (inst) == 10
+ pc = mips32_bc1_pc (gdbarch, regcache, inst, pc + 4, 2);
+ else if (op == 17 && itype_rs (inst) == 10
&& (itype_rt (inst) & 2) == 0)
/* BC1ANY4F, BC1ANY4T: 010001 01010 xxx0x */
- pc = mips32_bc1_pc (gdbarch, frame, inst, pc + 4, 4);
- else if (itype_op (inst) == 29)
+ pc = mips32_bc1_pc (gdbarch, regcache, inst, pc + 4, 4);
+ else if (op == 29)
/* JALX: 011101 */
/* The new PC will be alternate mode. */
{
/* Add 1 to indicate 16-bit mode -- invert ISA mode. */
pc = ((pc + 4) & ~(CORE_ADDR) 0x0fffffff) + reg + 1;
}
+ else if (is_octeon_bbit_op (op, gdbarch))
+ {
+ int bit, branch_if;
+
+ branch_if = op == 58 || op == 62;
+ bit = itype_rt (inst);
+
+ /* Take into account the *32 instructions. */
+ if (op == 54 || op == 62)
+ bit += 32;
+
+ if (((regcache_raw_get_signed (regcache,
+ itype_rs (inst)) >> bit) & 1)
+ == branch_if)
+ pc += mips32_relative_offset (inst) + 4;
+ else
+ pc += 8; /* After the delay slot. */
+ }
+
else
pc += 4; /* Not a branch, next instruction is easy. */
}
{ /* This gets way messy. */
/* Further subdivide into SPECIAL, REGIMM and other. */
- switch (op = itype_op (inst) & 0x07) /* Extract bits 28,27,26. */
+ switch (op & 0x07) /* Extract bits 28,27,26. */
{
case 0: /* SPECIAL */
op = rtype_funct (inst);
case 8: /* JR */
case 9: /* JALR */
/* Set PC to that address. */
- pc = get_frame_register_signed (frame, rtype_rs (inst));
+ pc = regcache_raw_get_signed (regcache, rtype_rs (inst));
break;
case 12: /* SYSCALL */
{
struct gdbarch_tdep *tdep;
- tdep = gdbarch_tdep (get_frame_arch (frame));
+ tdep = gdbarch_tdep (gdbarch);
if (tdep->syscall_next_pc != NULL)
- pc = tdep->syscall_next_pc (frame);
+ pc = tdep->syscall_next_pc (get_current_frame ());
else
pc += 4;
}
case 16: /* BLTZAL */
case 18: /* BLTZALL */
less_branch:
- if (get_frame_register_signed (frame, itype_rs (inst)) < 0)
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) < 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8; /* after the delay slot */
case 3: /* BGEZL */
case 17: /* BGEZAL */
case 19: /* BGEZALL */
- if (get_frame_register_signed (frame, itype_rs (inst)) >= 0)
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) >= 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8; /* after the delay slot */
/* No way to handle; it'll most likely trap anyway. */
break;
- if ((get_frame_register_unsigned (frame,
- dspctl) & 0x7f) >= pos)
+ if ((regcache_raw_get_unsigned (regcache,
+ dspctl) & 0x7f) >= pos)
pc += mips32_relative_offset (inst);
else
pc += 4;
break;
case 4: /* BEQ, BEQL */
equal_branch:
- if (get_frame_register_signed (frame, itype_rs (inst)) ==
- get_frame_register_signed (frame, itype_rt (inst)))
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) ==
+ regcache_raw_get_signed (regcache, itype_rt (inst)))
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
break;
case 5: /* BNE, BNEL */
neq_branch:
- if (get_frame_register_signed (frame, itype_rs (inst)) !=
- get_frame_register_signed (frame, itype_rt (inst)))
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) !=
+ regcache_raw_get_signed (regcache, itype_rt (inst)))
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
break;
case 6: /* BLEZ, BLEZL */
- if (get_frame_register_signed (frame, itype_rs (inst)) <= 0)
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) <= 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
case 7:
default:
greater_branch: /* BGTZ, BGTZL */
- if (get_frame_register_signed (frame, itype_rs (inst)) > 0)
+ if (regcache_raw_get_signed (regcache, itype_rs (inst)) > 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
return pc;
} /* mips32_next_pc */
-/* Decoding the next place to set a breakpoint is irregular for the
- mips 16 variant, but fortunately, there fewer instructions. We have
- to cope ith extensions for 16 bit instructions and a pair of actual
- 32 bit instructions. We dont want to set a single step instruction
- on the extend instruction either. */
+/* Extract the 7-bit signed immediate offset from the microMIPS instruction
+ INSN. */
-/* Lots of mips16 instruction formats */
-/* Predicting jumps requires itype,ritype,i8type
- and their extensions extItype,extritype,extI8type. */
-enum mips16_inst_fmts
-{
- itype, /* 0 immediate 5,10 */
- ritype, /* 1 5,3,8 */
- rrtype, /* 2 5,3,3,5 */
- rritype, /* 3 5,3,3,5 */
- rrrtype, /* 4 5,3,3,3,2 */
- rriatype, /* 5 5,3,3,1,4 */
- shifttype, /* 6 5,3,3,3,2 */
- i8type, /* 7 5,3,8 */
- i8movtype, /* 8 5,3,3,5 */
- i8mov32rtype, /* 9 5,3,5,3 */
- i64type, /* 10 5,3,8 */
- ri64type, /* 11 5,3,3,5 */
- jalxtype, /* 12 5,1,5,5,16 - a 32 bit instruction */
- exiItype, /* 13 5,6,5,5,1,1,1,1,1,1,5 */
- extRitype, /* 14 5,6,5,5,3,1,1,1,5 */
- extRRItype, /* 15 5,5,5,5,3,3,5 */
- extRRIAtype, /* 16 5,7,4,5,3,3,1,4 */
- EXTshifttype, /* 17 5,5,1,1,1,1,1,1,5,3,3,1,1,1,2 */
- extI8type, /* 18 5,6,5,5,3,1,1,1,5 */
- extI64type, /* 19 5,6,5,5,3,1,1,1,5 */
- extRi64type, /* 20 5,6,5,5,3,3,5 */
- extshift64type /* 21 5,5,1,1,1,1,1,1,5,1,1,1,3,5 */
-};
-/* I am heaping all the fields of the formats into one structure and
- then, only the fields which are involved in instruction extension. */
-struct upk_mips16
+static LONGEST
+micromips_relative_offset7 (ULONGEST insn)
{
- CORE_ADDR offset;
- unsigned int regx; /* Function in i8 type. */
- unsigned int regy;
-};
-
+ return ((b0s7_imm (insn) ^ 0x40) - 0x40) << 1;
+}
-/* The EXT-I, EXT-ri nad EXT-I8 instructions all have the same format
- for the bits which make up the immediate extension. */
+/* Extract the 10-bit signed immediate offset from the microMIPS instruction
+ INSN. */
-static CORE_ADDR
-extended_offset (unsigned int extension)
+static LONGEST
+micromips_relative_offset10 (ULONGEST insn)
{
- CORE_ADDR value;
+ return ((b0s10_imm (insn) ^ 0x200) - 0x200) << 1;
+}
- value = (extension >> 16) & 0x1f; /* Extract 15:11. */
- value = value << 6;
- value |= (extension >> 21) & 0x3f; /* Extract 10:5. */
- value = value << 5;
- value |= extension & 0x1f; /* Extract 4:0. */
+/* Extract the 16-bit signed immediate offset from the microMIPS instruction
+ INSN. */
- return value;
+static LONGEST
+micromips_relative_offset16 (ULONGEST insn)
+{
+ return ((b0s16_imm (insn) ^ 0x8000) - 0x8000) << 1;
}
-/* Only call this function if you know that this is an extendable
- instruction. It won't malfunction, but why make excess remote memory
- references? If the immediate operands get sign extended or something,
- do it after the extension is performed. */
-/* FIXME: Every one of these cases needs to worry about sign extension
- when the offset is to be used in relative addressing. */
+/* Return the size in bytes of the microMIPS instruction at the address PC. */
-static unsigned int
-fetch_mips_16 (struct gdbarch *gdbarch, CORE_ADDR pc)
+static int
+micromips_pc_insn_size (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- gdb_byte buf[8];
- pc &= 0xfffffffe; /* Clear the low order bit. */
- target_read_memory (pc, buf, 2);
- return extract_unsigned_integer (buf, 2, byte_order);
+ ULONGEST insn;
+
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, NULL);
+ return mips_insn_size (ISA_MICROMIPS, insn);
+}
+
+/* Calculate the address of the next microMIPS instruction to execute
+ after the INSN coprocessor 1 conditional branch instruction at the
+ address PC. COUNT denotes the number of coprocessor condition bits
+ examined by the branch. */
+
+static CORE_ADDR
+micromips_bc1_pc (struct gdbarch *gdbarch, struct regcache *regcache,
+ ULONGEST insn, CORE_ADDR pc, int count)
+{
+ int fcsr = mips_regnum (gdbarch)->fp_control_status;
+ int cnum = b2s3_cc (insn >> 16) & (count - 1);
+ int tf = b5s5_op (insn >> 16) & 1;
+ int mask = (1 << count) - 1;
+ ULONGEST fcs;
+ int cond;
+
+ if (fcsr == -1)
+ /* No way to handle; it'll most likely trap anyway. */
+ return pc;
+
+ fcs = regcache_raw_get_unsigned (regcache, fcsr);
+ cond = ((fcs >> 24) & 0xfe) | ((fcs >> 23) & 0x01);
+
+ if (((cond >> cnum) & mask) != mask * !tf)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+
+ return pc;
+}
+
+/* Calculate the address of the next microMIPS instruction to execute
+ after the instruction at the address PC. */
+
+static CORE_ADDR
+micromips_next_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ struct gdbarch *gdbarch = regcache->arch ();
+ ULONGEST insn;
+
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, NULL);
+ pc += MIPS_INSN16_SIZE;
+ switch (mips_insn_size (ISA_MICROMIPS, insn))
+ {
+ /* 32-bit instructions. */
+ case 2 * MIPS_INSN16_SIZE:
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, NULL);
+ pc += MIPS_INSN16_SIZE;
+ switch (micromips_op (insn >> 16))
+ {
+ case 0x00: /* POOL32A: bits 000000 */
+ switch (b0s6_op (insn))
+ {
+ case 0x3c: /* POOL32Axf: bits 000000 ... 111100 */
+ switch (b6s10_ext (insn))
+ {
+ case 0x3c: /* JALR: 000000 0000111100 111100 */
+ case 0x7c: /* JALR.HB: 000000 0001111100 111100 */
+ case 0x13c: /* JALRS: 000000 0100111100 111100 */
+ case 0x17c: /* JALRS.HB: 000000 0101111100 111100 */
+ pc = regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16));
+ break;
+ case 0x22d: /* SYSCALL: 000000 1000101101 111100 */
+ {
+ struct gdbarch_tdep *tdep;
+
+ tdep = gdbarch_tdep (gdbarch);
+ if (tdep->syscall_next_pc != NULL)
+ pc = tdep->syscall_next_pc (get_current_frame ());
+ }
+ break;
+ }
+ break;
+ }
+ break;
+
+ case 0x10: /* POOL32I: bits 010000 */
+ switch (b5s5_op (insn >> 16))
+ {
+ case 0x00: /* BLTZ: bits 010000 00000 */
+ case 0x01: /* BLTZAL: bits 010000 00001 */
+ case 0x11: /* BLTZALS: bits 010000 10001 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) < 0)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x02: /* BGEZ: bits 010000 00010 */
+ case 0x03: /* BGEZAL: bits 010000 00011 */
+ case 0x13: /* BGEZALS: bits 010000 10011 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) >= 0)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x04: /* BLEZ: bits 010000 00100 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) <= 0)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x05: /* BNEZC: bits 010000 00101 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) != 0)
+ pc += micromips_relative_offset16 (insn);
+ break;
+
+ case 0x06: /* BGTZ: bits 010000 00110 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) > 0)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x07: /* BEQZC: bits 010000 00111 */
+ if (regcache_raw_get_signed (regcache,
+ b0s5_reg (insn >> 16)) == 0)
+ pc += micromips_relative_offset16 (insn);
+ break;
+
+ case 0x14: /* BC2F: bits 010000 10100 xxx00 */
+ case 0x15: /* BC2T: bits 010000 10101 xxx00 */
+ if (((insn >> 16) & 0x3) == 0x0)
+ /* BC2F, BC2T: don't know how to handle these. */
+ break;
+ break;
+
+ case 0x1a: /* BPOSGE64: bits 010000 11010 */
+ case 0x1b: /* BPOSGE32: bits 010000 11011 */
+ {
+ unsigned int pos = (b5s5_op (insn >> 16) & 1) ? 32 : 64;
+ int dspctl = mips_regnum (gdbarch)->dspctl;
+
+ if (dspctl == -1)
+ /* No way to handle; it'll most likely trap anyway. */
+ break;
+
+ if ((regcache_raw_get_unsigned (regcache,
+ dspctl) & 0x7f) >= pos)
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ }
+ break;
+
+ case 0x1c: /* BC1F: bits 010000 11100 xxx00 */
+ /* BC1ANY2F: bits 010000 11100 xxx01 */
+ case 0x1d: /* BC1T: bits 010000 11101 xxx00 */
+ /* BC1ANY2T: bits 010000 11101 xxx01 */
+ if (((insn >> 16) & 0x2) == 0x0)
+ pc = micromips_bc1_pc (gdbarch, regcache, insn, pc,
+ ((insn >> 16) & 0x1) + 1);
+ break;
+
+ case 0x1e: /* BC1ANY4F: bits 010000 11110 xxx01 */
+ case 0x1f: /* BC1ANY4T: bits 010000 11111 xxx01 */
+ if (((insn >> 16) & 0x3) == 0x1)
+ pc = micromips_bc1_pc (gdbarch, regcache, insn, pc, 4);
+ break;
+ }
+ break;
+
+ case 0x1d: /* JALS: bits 011101 */
+ case 0x35: /* J: bits 110101 */
+ case 0x3d: /* JAL: bits 111101 */
+ pc = ((pc | 0x7fffffe) ^ 0x7fffffe) | (b0s26_imm (insn) << 1);
+ break;
+
+ case 0x25: /* BEQ: bits 100101 */
+ if (regcache_raw_get_signed (regcache, b0s5_reg (insn >> 16))
+ == regcache_raw_get_signed (regcache, b5s5_reg (insn >> 16)))
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x2d: /* BNE: bits 101101 */
+ if (regcache_raw_get_signed (regcache, b0s5_reg (insn >> 16))
+ != regcache_raw_get_signed (regcache, b5s5_reg (insn >> 16)))
+ pc += micromips_relative_offset16 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ break;
+
+ case 0x3c: /* JALX: bits 111100 */
+ pc = ((pc | 0xfffffff) ^ 0xfffffff) | (b0s26_imm (insn) << 2);
+ break;
+ }
+ break;
+
+ /* 16-bit instructions. */
+ case MIPS_INSN16_SIZE:
+ switch (micromips_op (insn))
+ {
+ case 0x11: /* POOL16C: bits 010001 */
+ if ((b5s5_op (insn) & 0x1c) == 0xc)
+ /* JR16, JRC, JALR16, JALRS16: 010001 011xx */
+ pc = regcache_raw_get_signed (regcache, b0s5_reg (insn));
+ else if (b5s5_op (insn) == 0x18)
+ /* JRADDIUSP: bits 010001 11000 */
+ pc = regcache_raw_get_signed (regcache, MIPS_RA_REGNUM);
+ break;
+
+ case 0x23: /* BEQZ16: bits 100011 */
+ {
+ int rs = mips_reg3_to_reg[b7s3_reg (insn)];
+
+ if (regcache_raw_get_signed (regcache, rs) == 0)
+ pc += micromips_relative_offset7 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ }
+ break;
+
+ case 0x2b: /* BNEZ16: bits 101011 */
+ {
+ int rs = mips_reg3_to_reg[b7s3_reg (insn)];
+
+ if (regcache_raw_get_signed (regcache, rs) != 0)
+ pc += micromips_relative_offset7 (insn);
+ else
+ pc += micromips_pc_insn_size (gdbarch, pc);
+ }
+ break;
+
+ case 0x33: /* B16: bits 110011 */
+ pc += micromips_relative_offset10 (insn);
+ break;
+ }
+ break;
+ }
+
+ return pc;
+}
+
+/* Decoding the next place to set a breakpoint is irregular for the
+ mips 16 variant, but fortunately, there fewer instructions. We have
+ to cope ith extensions for 16 bit instructions and a pair of actual
+ 32 bit instructions. We dont want to set a single step instruction
+ on the extend instruction either. */
+
+/* Lots of mips16 instruction formats */
+/* Predicting jumps requires itype,ritype,i8type
+ and their extensions extItype,extritype,extI8type. */
+enum mips16_inst_fmts
+{
+ itype, /* 0 immediate 5,10 */
+ ritype, /* 1 5,3,8 */
+ rrtype, /* 2 5,3,3,5 */
+ rritype, /* 3 5,3,3,5 */
+ rrrtype, /* 4 5,3,3,3,2 */
+ rriatype, /* 5 5,3,3,1,4 */
+ shifttype, /* 6 5,3,3,3,2 */
+ i8type, /* 7 5,3,8 */
+ i8movtype, /* 8 5,3,3,5 */
+ i8mov32rtype, /* 9 5,3,5,3 */
+ i64type, /* 10 5,3,8 */
+ ri64type, /* 11 5,3,3,5 */
+ jalxtype, /* 12 5,1,5,5,16 - a 32 bit instruction */
+ exiItype, /* 13 5,6,5,5,1,1,1,1,1,1,5 */
+ extRitype, /* 14 5,6,5,5,3,1,1,1,5 */
+ extRRItype, /* 15 5,5,5,5,3,3,5 */
+ extRRIAtype, /* 16 5,7,4,5,3,3,1,4 */
+ EXTshifttype, /* 17 5,5,1,1,1,1,1,1,5,3,3,1,1,1,2 */
+ extI8type, /* 18 5,6,5,5,3,1,1,1,5 */
+ extI64type, /* 19 5,6,5,5,3,1,1,1,5 */
+ extRi64type, /* 20 5,6,5,5,3,3,5 */
+ extshift64type /* 21 5,5,1,1,1,1,1,1,5,1,1,1,3,5 */
+};
+/* I am heaping all the fields of the formats into one structure and
+ then, only the fields which are involved in instruction extension. */
+struct upk_mips16
+{
+ CORE_ADDR offset;
+ unsigned int regx; /* Function in i8 type. */
+ unsigned int regy;
+};
+
+
+/* The EXT-I, EXT-ri nad EXT-I8 instructions all have the same format
+ for the bits which make up the immediate extension. */
+
+static CORE_ADDR
+extended_offset (unsigned int extension)
+{
+ CORE_ADDR value;
+
+ value = (extension >> 16) & 0x1f; /* Extract 15:11. */
+ value = value << 6;
+ value |= (extension >> 21) & 0x3f; /* Extract 10:5. */
+ value = value << 5;
+ value |= extension & 0x1f; /* Extract 4:0. */
+
+ return value;
+}
+
+/* Only call this function if you know that this is an extendable
+ instruction. It won't malfunction, but why make excess remote memory
+ references? If the immediate operands get sign extended or something,
+ do it after the extension is performed. */
+/* FIXME: Every one of these cases needs to worry about sign extension
+ when the offset is to be used in relative addressing. */
+
+static unsigned int
+fetch_mips_16 (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[8];
+
+ pc = unmake_compact_addr (pc); /* Clear the low order bit. */
+ target_read_memory (pc, buf, 2);
+ return extract_unsigned_integer (buf, 2, byte_order);
}
static void
unsigned int nexthalf;
value = ((inst & 0x1f) << 5) | ((inst >> 5) & 0x1f);
value = value << 16;
- nexthalf = mips_fetch_instruction (gdbarch, pc + 2); /* low bit
- still set. */
+ nexthalf = mips_fetch_instruction (gdbarch, ISA_MIPS16, pc + 2, NULL);
+ /* Low bit still set. */
value |= nexthalf;
offset = value;
regx = -1;
}
+/* Calculate the destination of a branch whose 16-bit opcode word is at PC,
+ and having a signed 16-bit OFFSET. */
+
static CORE_ADDR
add_offset_16 (CORE_ADDR pc, int offset)
{
- return ((offset << 2) | ((pc + 2) & (~(CORE_ADDR) 0x0fffffff)));
+ return pc + (offset << 1) + 2;
}
static CORE_ADDR
-extended_mips16_next_pc (struct frame_info *frame, CORE_ADDR pc,
+extended_mips16_next_pc (regcache *regcache, CORE_ADDR pc,
unsigned int extension, unsigned int insn)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
int op = (insn >> 11);
switch (op)
{
{
struct upk_mips16 upk;
unpack_mips16 (gdbarch, pc, extension, insn, itype, &upk);
- pc += (upk.offset << 1) + 2;
+ pc = add_offset_16 (pc, upk.offset);
break;
}
case 3: /* JAL , JALX - Watch out, these are 32 bit
{
struct upk_mips16 upk;
unpack_mips16 (gdbarch, pc, extension, insn, jalxtype, &upk);
- pc = add_offset_16 (pc, upk.offset);
+ pc = ((pc + 2) & (~(CORE_ADDR) 0x0fffffff)) | (upk.offset << 2);
if ((insn >> 10) & 0x01) /* Exchange mode */
pc = pc & ~0x01; /* Clear low bit, indicate 32 bit mode. */
else
struct upk_mips16 upk;
int reg;
unpack_mips16 (gdbarch, pc, extension, insn, ritype, &upk);
- reg = get_frame_register_signed (frame, mips16_to_32_reg[upk.regx]);
+ reg = regcache_raw_get_signed (regcache, mips_reg3_to_reg[upk.regx]);
if (reg == 0)
- pc += (upk.offset << 1) + 2;
+ pc = add_offset_16 (pc, upk.offset);
else
pc += 2;
break;
struct upk_mips16 upk;
int reg;
unpack_mips16 (gdbarch, pc, extension, insn, ritype, &upk);
- reg = get_frame_register_signed (frame, mips16_to_32_reg[upk.regx]);
+ reg = regcache_raw_get_signed (regcache, mips_reg3_to_reg[upk.regx]);
if (reg != 0)
- pc += (upk.offset << 1) + 2;
+ pc = add_offset_16 (pc, upk.offset);
else
pc += 2;
break;
int reg;
unpack_mips16 (gdbarch, pc, extension, insn, i8type, &upk);
/* upk.regx contains the opcode */
- reg = get_frame_register_signed (frame, 24); /* Test register is 24 */
+ /* Test register is 24 */
+ reg = regcache_raw_get_signed (regcache, 24);
if (((upk.regx == 0) && (reg == 0)) /* BTEZ */
|| ((upk.regx == 1) && (reg != 0))) /* BTNEZ */
- /* pc = add_offset_16(pc,upk.offset) ; */
- pc += (upk.offset << 1) + 2;
+ pc = add_offset_16 (pc, upk.offset);
else
pc += 2;
break;
upk.regx = (insn >> 8) & 0x07;
upk.regy = (insn >> 5) & 0x07;
if ((upk.regy & 1) == 0)
- reg = mips16_to_32_reg[upk.regx];
+ reg = mips_reg3_to_reg[upk.regx];
else
reg = 31; /* Function return instruction. */
- pc = get_frame_register_signed (frame, reg);
+ pc = regcache_raw_get_signed (regcache, reg);
}
else
pc += 2;
that. */
{
pc += 2;
- pc = extended_mips16_next_pc (frame, pc, insn,
+ pc = extended_mips16_next_pc (regcache, pc, insn,
fetch_mips_16 (gdbarch, pc));
break;
}
}
static CORE_ADDR
-mips16_next_pc (struct frame_info *frame, CORE_ADDR pc)
+mips16_next_pc (struct regcache *regcache, CORE_ADDR pc)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
unsigned int insn = fetch_mips_16 (gdbarch, pc);
- return extended_mips16_next_pc (frame, pc, 0, insn);
+ return extended_mips16_next_pc (regcache, pc, 0, insn);
}
/* The mips_next_pc function supports single_step when the remote
target monitor or stub is not developed enough to do a single_step.
It works by decoding the current instruction and predicting where a
- branch will go. This isnt hard because all the data is available.
- The MIPS32 and MIPS16 variants are quite different. */
+ branch will go. This isn't hard because all the data is available.
+ The MIPS32, MIPS16 and microMIPS variants are quite different. */
static CORE_ADDR
-mips_next_pc (struct frame_info *frame, CORE_ADDR pc)
+mips_next_pc (struct regcache *regcache, CORE_ADDR pc)
{
- if (mips_pc_is_mips16 (pc))
- return mips16_next_pc (frame, pc);
+ struct gdbarch *gdbarch = regcache->arch ();
+
+ if (mips_pc_is_mips16 (gdbarch, pc))
+ return mips16_next_pc (regcache, pc);
+ else if (mips_pc_is_micromips (gdbarch, pc))
+ return micromips_next_pc (regcache, pc);
else
- return mips32_next_pc (frame, pc);
+ return mips32_next_pc (regcache, pc);
+}
+
+/* Return non-zero if the MIPS16 instruction INSN is a compact branch
+ or jump. */
+
+static int
+mips16_instruction_is_compact_branch (unsigned short insn)
+{
+ switch (insn & 0xf800)
+ {
+ case 0xe800:
+ return (insn & 0x009f) == 0x80; /* JALRC/JRC */
+ case 0x6000:
+ return (insn & 0x0600) == 0; /* BTNEZ/BTEQZ */
+ case 0x2800: /* BNEZ */
+ case 0x2000: /* BEQZ */
+ case 0x1000: /* B */
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+/* Return non-zero if the microMIPS instruction INSN is a compact branch
+ or jump. */
+
+static int
+micromips_instruction_is_compact_branch (unsigned short insn)
+{
+ switch (micromips_op (insn))
+ {
+ case 0x11: /* POOL16C: bits 010001 */
+ return (b5s5_op (insn) == 0x18
+ /* JRADDIUSP: bits 010001 11000 */
+ || b5s5_op (insn) == 0xd);
+ /* JRC: bits 010011 01101 */
+ case 0x10: /* POOL32I: bits 010000 */
+ return (b5s5_op (insn) & 0x1d) == 0x5;
+ /* BEQZC/BNEZC: bits 010000 001x1 */
+ default:
+ return 0;
+ }
}
struct mips_frame_cache
struct frame_info *this_frame,
struct mips_frame_cache *this_cache)
{
+ int prev_non_prologue_insn = 0;
+ int this_non_prologue_insn;
+ int non_prologue_insns = 0;
+ CORE_ADDR prev_pc;
CORE_ADDR cur_pc;
CORE_ADDR frame_addr = 0; /* Value of $r17, used as frame pointer. */
CORE_ADDR sp;
unsigned inst = 0; /* current instruction */
unsigned entry_inst = 0; /* the entry instruction */
unsigned save_inst = 0; /* the save instruction */
+ int prev_delay_slot = 0;
+ int in_delay_slot;
int reg, offset;
int extend_bytes = 0;
- int prev_extend_bytes;
- CORE_ADDR end_prologue_addr = 0;
+ int prev_extend_bytes = 0;
+ CORE_ADDR end_prologue_addr;
/* Can be called when there's no process, and hence when there's no
THIS_FRAME. */
if (limit_pc > start_pc + 200)
limit_pc = start_pc + 200;
+ prev_pc = start_pc;
+ /* Permit at most one non-prologue non-control-transfer instruction
+ in the middle which may have been reordered by the compiler for
+ optimisation. */
for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSN16_SIZE)
{
+ this_non_prologue_insn = 0;
+ in_delay_slot = 0;
+
/* Save the previous instruction. If it's an EXTEND, we'll extract
the immediate offset extension from it in mips16_get_imm. */
prev_inst = inst;
/* Fetch and decode the instruction. */
- inst = (unsigned short) mips_fetch_instruction (gdbarch, cur_pc);
+ inst = (unsigned short) mips_fetch_instruction (gdbarch, ISA_MIPS16,
+ cur_pc, NULL);
/* Normally we ignore extend instructions. However, if it is
not followed by a valid prologue instruction, then this
else if ((inst & 0xf800) == 0xd000) /* sw reg,n($sp) */
{
offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
- reg = mips16_to_32_reg[(inst & 0x700) >> 8];
+ reg = mips_reg3_to_reg[(inst & 0x700) >> 8];
set_reg_offset (gdbarch, this_cache, reg, sp + offset);
}
else if ((inst & 0xff00) == 0xf900) /* sd reg,n($sp) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
- reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
+ reg = mips_reg3_to_reg[(inst & 0xe0) >> 5];
set_reg_offset (gdbarch, this_cache, reg, sp + offset);
}
else if ((inst & 0xff00) == 0x6200) /* sw $ra,n($sp) */
else if ((inst & 0xFF00) == 0xd900) /* sw reg,offset($s1) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 4, 0);
- reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
+ reg = mips_reg3_to_reg[(inst & 0xe0) >> 5];
set_reg_offset (gdbarch, this_cache, reg, frame_addr + offset);
}
else if ((inst & 0xFF00) == 0x7900) /* sd reg,offset($s1) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
- reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
+ reg = mips_reg3_to_reg[(inst & 0xe0) >> 5];
set_reg_offset (gdbarch, this_cache, reg, frame_addr + offset);
}
else if ((inst & 0xf81f) == 0xe809
if (prev_extend_bytes) /* extend */
save_inst |= prev_inst << 16;
}
- else if ((inst & 0xf800) == 0x1800) /* jal(x) */
- cur_pc += MIPS_INSN16_SIZE; /* 32-bit instruction */
else if ((inst & 0xff1c) == 0x6704) /* move reg,$a0-$a3 */
{
/* This instruction is part of the prologue, but we don't
need to do anything special to handle it. */
}
+ else if (mips16_instruction_has_delay_slot (inst, 0))
+ /* JAL/JALR/JALX/JR */
+ {
+ /* The instruction in the delay slot can be a part
+ of the prologue, so move forward once more. */
+ in_delay_slot = 1;
+ if (mips16_instruction_has_delay_slot (inst, 1))
+ /* JAL/JALX */
+ {
+ prev_extend_bytes = MIPS_INSN16_SIZE;
+ cur_pc += MIPS_INSN16_SIZE; /* 32-bit instruction */
+ }
+ }
else
{
- /* This instruction is not an instruction typically found
- in a prologue, so we must have reached the end of the
- prologue. */
- if (end_prologue_addr == 0)
- end_prologue_addr = cur_pc - prev_extend_bytes;
+ this_non_prologue_insn = 1;
}
+
+ non_prologue_insns += this_non_prologue_insn;
+
+ /* A jump or branch, or enough non-prologue insns seen? If so,
+ then we must have reached the end of the prologue by now. */
+ if (prev_delay_slot || non_prologue_insns > 1
+ || mips16_instruction_is_compact_branch (inst))
+ break;
+
+ prev_non_prologue_insn = this_non_prologue_insn;
+ prev_delay_slot = in_delay_slot;
+ prev_pc = cur_pc - prev_extend_bytes;
}
/* The entry instruction is typically the first instruction in a function,
= this_cache->saved_regs[gdbarch_num_regs (gdbarch) + MIPS_RA_REGNUM];
}
- /* If we didn't reach the end of the prologue when scanning the function
- instructions, then set end_prologue_addr to the address of the
- instruction immediately after the last one we scanned. */
- if (end_prologue_addr == 0)
- end_prologue_addr = cur_pc;
+ /* Set end_prologue_addr to the address of the instruction immediately
+ after the last one we scanned. Unless the last one looked like a
+ non-prologue instruction (and we looked ahead), in which case use
+ its address instead. */
+ end_prologue_addr = (prev_non_prologue_insn || prev_delay_slot
+ ? prev_pc : cur_pc - prev_extend_bytes);
return end_prologue_addr;
}
struct mips_frame_cache *cache;
if ((*this_cache) != NULL)
- return (*this_cache);
+ return (struct mips_frame_cache *) (*this_cache);
cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
(*this_cache) = cache;
cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
if (start_addr == 0)
return cache;
- mips16_scan_prologue (gdbarch, start_addr, pc, this_frame, *this_cache);
+ mips16_scan_prologue (gdbarch, start_addr, pc, this_frame,
+ (struct mips_frame_cache *) *this_cache);
}
/* gdbarch_sp_regnum contains the value and not the address. */
gdbarch_num_regs (gdbarch) + MIPS_SP_REGNUM,
cache->base);
- return (*this_cache);
+ return (struct mips_frame_cache *) (*this_cache);
+}
+
+static void
+mips_insn16_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
+ this_cache);
+ /* This marks the outermost frame. */
+ if (info->base == 0)
+ return;
+ (*this_id) = frame_id_build (info->base, get_frame_func (this_frame));
+}
+
+static struct value *
+mips_insn16_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
+ this_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static int
+mips_insn16_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ if (mips_pc_is_mips16 (gdbarch, pc))
+ return 1;
+ return 0;
+}
+
+static const struct frame_unwind mips_insn16_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ mips_insn16_frame_this_id,
+ mips_insn16_frame_prev_register,
+ NULL,
+ mips_insn16_frame_sniffer
+};
+
+static CORE_ADDR
+mips_insn16_frame_base_address (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
+ this_cache);
+ return info->base;
+}
+
+static const struct frame_base mips_insn16_frame_base =
+{
+ &mips_insn16_frame_unwind,
+ mips_insn16_frame_base_address,
+ mips_insn16_frame_base_address,
+ mips_insn16_frame_base_address
+};
+
+static const struct frame_base *
+mips_insn16_frame_base_sniffer (struct frame_info *this_frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ if (mips_pc_is_mips16 (gdbarch, pc))
+ return &mips_insn16_frame_base;
+ else
+ return NULL;
+}
+
+/* Decode a 9-bit signed immediate argument of ADDIUSP -- -2 is mapped
+ to -258, -1 -- to -257, 0 -- to 256, 1 -- to 257 and other values are
+ interpreted directly, and then multiplied by 4. */
+
+static int
+micromips_decode_imm9 (int imm)
+{
+ imm = (imm ^ 0x100) - 0x100;
+ if (imm > -3 && imm < 2)
+ imm ^= 0x100;
+ return imm << 2;
+}
+
+/* Analyze the function prologue from START_PC to LIMIT_PC. Return
+ the address of the first instruction past the prologue. */
+
+static CORE_ADDR
+micromips_scan_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct frame_info *this_frame,
+ struct mips_frame_cache *this_cache)
+{
+ CORE_ADDR end_prologue_addr;
+ int prev_non_prologue_insn = 0;
+ int frame_reg = MIPS_SP_REGNUM;
+ int this_non_prologue_insn;
+ int non_prologue_insns = 0;
+ long frame_offset = 0; /* Size of stack frame. */
+ long frame_adjust = 0; /* Offset of FP from SP. */
+ int prev_delay_slot = 0;
+ int in_delay_slot;
+ CORE_ADDR prev_pc;
+ CORE_ADDR cur_pc;
+ ULONGEST insn; /* current instruction */
+ CORE_ADDR sp;
+ long offset;
+ long sp_adj;
+ long v1_off = 0; /* The assumption is LUI will replace it. */
+ int reglist;
+ int breg;
+ int dreg;
+ int sreg;
+ int treg;
+ int loc;
+ int op;
+ int s;
+ int i;
+
+ /* Can be called when there's no process, and hence when there's no
+ THIS_FRAME. */
+ if (this_frame != NULL)
+ sp = get_frame_register_signed (this_frame,
+ gdbarch_num_regs (gdbarch)
+ + MIPS_SP_REGNUM);
+ else
+ sp = 0;
+
+ if (limit_pc > start_pc + 200)
+ limit_pc = start_pc + 200;
+ prev_pc = start_pc;
+
+ /* Permit at most one non-prologue non-control-transfer instruction
+ in the middle which may have been reordered by the compiler for
+ optimisation. */
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += loc)
+ {
+ this_non_prologue_insn = 0;
+ in_delay_slot = 0;
+ sp_adj = 0;
+ loc = 0;
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, cur_pc, NULL);
+ loc += MIPS_INSN16_SIZE;
+ switch (mips_insn_size (ISA_MICROMIPS, insn))
+ {
+ /* 32-bit instructions. */
+ case 2 * MIPS_INSN16_SIZE:
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch,
+ ISA_MICROMIPS, cur_pc + loc, NULL);
+ loc += MIPS_INSN16_SIZE;
+ switch (micromips_op (insn >> 16))
+ {
+ /* Record $sp/$fp adjustment. */
+ /* Discard (D)ADDU $gp,$jp used for PIC code. */
+ case 0x0: /* POOL32A: bits 000000 */
+ case 0x16: /* POOL32S: bits 010110 */
+ op = b0s11_op (insn);
+ sreg = b0s5_reg (insn >> 16);
+ treg = b5s5_reg (insn >> 16);
+ dreg = b11s5_reg (insn);
+ if (op == 0x1d0
+ /* SUBU: bits 000000 00111010000 */
+ /* DSUBU: bits 010110 00111010000 */
+ && dreg == MIPS_SP_REGNUM && sreg == MIPS_SP_REGNUM
+ && treg == 3)
+ /* (D)SUBU $sp, $v1 */
+ sp_adj = v1_off;
+ else if (op != 0x150
+ /* ADDU: bits 000000 00101010000 */
+ /* DADDU: bits 010110 00101010000 */
+ || dreg != 28 || sreg != 28 || treg != MIPS_T9_REGNUM)
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x8: /* POOL32B: bits 001000 */
+ op = b12s4_op (insn);
+ breg = b0s5_reg (insn >> 16);
+ reglist = sreg = b5s5_reg (insn >> 16);
+ offset = (b0s12_imm (insn) ^ 0x800) - 0x800;
+ if ((op == 0x9 || op == 0xc)
+ /* SWP: bits 001000 1001 */
+ /* SDP: bits 001000 1100 */
+ && breg == MIPS_SP_REGNUM && sreg < MIPS_RA_REGNUM)
+ /* S[DW]P reg,offset($sp) */
+ {
+ s = 4 << ((b12s4_op (insn) & 0x4) == 0x4);
+ set_reg_offset (gdbarch, this_cache,
+ sreg, sp + offset);
+ set_reg_offset (gdbarch, this_cache,
+ sreg + 1, sp + offset + s);
+ }
+ else if ((op == 0xd || op == 0xf)
+ /* SWM: bits 001000 1101 */
+ /* SDM: bits 001000 1111 */
+ && breg == MIPS_SP_REGNUM
+ /* SWM reglist,offset($sp) */
+ && ((reglist >= 1 && reglist <= 9)
+ || (reglist >= 16 && reglist <= 25)))
+ {
+ int sreglist = std::min(reglist & 0xf, 8);
+
+ s = 4 << ((b12s4_op (insn) & 0x2) == 0x2);
+ for (i = 0; i < sreglist; i++)
+ set_reg_offset (gdbarch, this_cache, 16 + i, sp + s * i);
+ if ((reglist & 0xf) > 8)
+ set_reg_offset (gdbarch, this_cache, 30, sp + s * i++);
+ if ((reglist & 0x10) == 0x10)
+ set_reg_offset (gdbarch, this_cache,
+ MIPS_RA_REGNUM, sp + s * i++);
+ }
+ else
+ this_non_prologue_insn = 1;
+ break;
+
+ /* Record $sp/$fp adjustment. */
+ /* Discard (D)ADDIU $gp used for PIC code. */
+ case 0xc: /* ADDIU: bits 001100 */
+ case 0x17: /* DADDIU: bits 010111 */
+ sreg = b0s5_reg (insn >> 16);
+ dreg = b5s5_reg (insn >> 16);
+ offset = (b0s16_imm (insn) ^ 0x8000) - 0x8000;
+ if (sreg == MIPS_SP_REGNUM && dreg == MIPS_SP_REGNUM)
+ /* (D)ADDIU $sp, imm */
+ sp_adj = offset;
+ else if (sreg == MIPS_SP_REGNUM && dreg == 30)
+ /* (D)ADDIU $fp, $sp, imm */
+ {
+ frame_adjust = offset;
+ frame_reg = 30;
+ }
+ else if (sreg != 28 || dreg != 28)
+ /* (D)ADDIU $gp, imm */
+ this_non_prologue_insn = 1;
+ break;
+
+ /* LUI $v1 is used for larger $sp adjustments. */
+ /* Discard LUI $gp used for PIC code. */
+ case 0x10: /* POOL32I: bits 010000 */
+ if (b5s5_op (insn >> 16) == 0xd
+ /* LUI: bits 010000 001101 */
+ && b0s5_reg (insn >> 16) == 3)
+ /* LUI $v1, imm */
+ v1_off = ((b0s16_imm (insn) << 16) ^ 0x80000000) - 0x80000000;
+ else if (b5s5_op (insn >> 16) != 0xd
+ /* LUI: bits 010000 001101 */
+ || b0s5_reg (insn >> 16) != 28)
+ /* LUI $gp, imm */
+ this_non_prologue_insn = 1;
+ break;
+
+ /* ORI $v1 is used for larger $sp adjustments. */
+ case 0x14: /* ORI: bits 010100 */
+ sreg = b0s5_reg (insn >> 16);
+ dreg = b5s5_reg (insn >> 16);
+ if (sreg == 3 && dreg == 3)
+ /* ORI $v1, imm */
+ v1_off |= b0s16_imm (insn);
+ else
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x26: /* SWC1: bits 100110 */
+ case 0x2e: /* SDC1: bits 101110 */
+ breg = b0s5_reg (insn >> 16);
+ if (breg != MIPS_SP_REGNUM)
+ /* S[DW]C1 reg,offset($sp) */
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x36: /* SD: bits 110110 */
+ case 0x3e: /* SW: bits 111110 */
+ breg = b0s5_reg (insn >> 16);
+ sreg = b5s5_reg (insn >> 16);
+ offset = (b0s16_imm (insn) ^ 0x8000) - 0x8000;
+ if (breg == MIPS_SP_REGNUM)
+ /* S[DW] reg,offset($sp) */
+ set_reg_offset (gdbarch, this_cache, sreg, sp + offset);
+ else
+ this_non_prologue_insn = 1;
+ break;
+
+ default:
+ /* The instruction in the delay slot can be a part
+ of the prologue, so move forward once more. */
+ if (micromips_instruction_has_delay_slot (insn, 0))
+ in_delay_slot = 1;
+ else
+ this_non_prologue_insn = 1;
+ break;
+ }
+ insn >>= 16;
+ break;
+
+ /* 16-bit instructions. */
+ case MIPS_INSN16_SIZE:
+ switch (micromips_op (insn))
+ {
+ case 0x3: /* MOVE: bits 000011 */
+ sreg = b0s5_reg (insn);
+ dreg = b5s5_reg (insn);
+ if (sreg == MIPS_SP_REGNUM && dreg == 30)
+ /* MOVE $fp, $sp */
+ frame_reg = 30;
+ else if ((sreg & 0x1c) != 0x4)
+ /* MOVE reg, $a0-$a3 */
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x11: /* POOL16C: bits 010001 */
+ if (b6s4_op (insn) == 0x5)
+ /* SWM: bits 010001 0101 */
+ {
+ offset = ((b0s4_imm (insn) << 2) ^ 0x20) - 0x20;
+ reglist = b4s2_regl (insn);
+ for (i = 0; i <= reglist; i++)
+ set_reg_offset (gdbarch, this_cache, 16 + i, sp + 4 * i);
+ set_reg_offset (gdbarch, this_cache,
+ MIPS_RA_REGNUM, sp + 4 * i++);
+ }
+ else
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x13: /* POOL16D: bits 010011 */
+ if ((insn & 0x1) == 0x1)
+ /* ADDIUSP: bits 010011 1 */
+ sp_adj = micromips_decode_imm9 (b1s9_imm (insn));
+ else if (b5s5_reg (insn) == MIPS_SP_REGNUM)
+ /* ADDIUS5: bits 010011 0 */
+ /* ADDIUS5 $sp, imm */
+ sp_adj = (b1s4_imm (insn) ^ 8) - 8;
+ else
+ this_non_prologue_insn = 1;
+ break;
+
+ case 0x32: /* SWSP: bits 110010 */
+ offset = b0s5_imm (insn) << 2;
+ sreg = b5s5_reg (insn);
+ set_reg_offset (gdbarch, this_cache, sreg, sp + offset);
+ break;
+
+ default:
+ /* The instruction in the delay slot can be a part
+ of the prologue, so move forward once more. */
+ if (micromips_instruction_has_delay_slot (insn << 16, 0))
+ in_delay_slot = 1;
+ else
+ this_non_prologue_insn = 1;
+ break;
+ }
+ break;
+ }
+ if (sp_adj < 0)
+ frame_offset -= sp_adj;
+
+ non_prologue_insns += this_non_prologue_insn;
+
+ /* A jump or branch, enough non-prologue insns seen or positive
+ stack adjustment? If so, then we must have reached the end
+ of the prologue by now. */
+ if (prev_delay_slot || non_prologue_insns > 1 || sp_adj > 0
+ || micromips_instruction_is_compact_branch (insn))
+ break;
+
+ prev_non_prologue_insn = this_non_prologue_insn;
+ prev_delay_slot = in_delay_slot;
+ prev_pc = cur_pc;
+ }
+
+ if (this_cache != NULL)
+ {
+ this_cache->base =
+ (get_frame_register_signed (this_frame,
+ gdbarch_num_regs (gdbarch) + frame_reg)
+ + frame_offset - frame_adjust);
+ /* FIXME: brobecker/2004-10-10: Just as in the mips32 case, we should
+ be able to get rid of the assignment below, evetually. But it's
+ still needed for now. */
+ this_cache->saved_regs[gdbarch_num_regs (gdbarch)
+ + mips_regnum (gdbarch)->pc]
+ = this_cache->saved_regs[gdbarch_num_regs (gdbarch) + MIPS_RA_REGNUM];
+ }
+
+ /* Set end_prologue_addr to the address of the instruction immediately
+ after the last one we scanned. Unless the last one looked like a
+ non-prologue instruction (and we looked ahead), in which case use
+ its address instead. */
+ end_prologue_addr
+ = prev_non_prologue_insn || prev_delay_slot ? prev_pc : cur_pc;
+
+ return end_prologue_addr;
+}
+
+/* Heuristic unwinder for procedures using microMIPS instructions.
+ Procedures that use the 32-bit instruction set are handled by the
+ mips_insn32 unwinder. Likewise MIPS16 and the mips_insn16 unwinder. */
+
+static struct mips_frame_cache *
+mips_micro_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct mips_frame_cache *cache;
+
+ if ((*this_cache) != NULL)
+ return (struct mips_frame_cache *) (*this_cache);
+
+ cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
+ (*this_cache) = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ /* Analyze the function prologue. */
+ {
+ const CORE_ADDR pc = get_frame_address_in_block (this_frame);
+ CORE_ADDR start_addr;
+
+ find_pc_partial_function (pc, NULL, &start_addr, NULL);
+ if (start_addr == 0)
+ start_addr = heuristic_proc_start (get_frame_arch (this_frame), pc);
+ /* We can't analyze the prologue if we couldn't find the begining
+ of the function. */
+ if (start_addr == 0)
+ return cache;
+
+ micromips_scan_prologue (gdbarch, start_addr, pc, this_frame,
+ (struct mips_frame_cache *) *this_cache);
+ }
+
+ /* gdbarch_sp_regnum contains the value and not the address. */
+ trad_frame_set_value (cache->saved_regs,
+ gdbarch_num_regs (gdbarch) + MIPS_SP_REGNUM,
+ cache->base);
+
+ return (struct mips_frame_cache *) (*this_cache);
}
static void
-mips_insn16_frame_this_id (struct frame_info *this_frame, void **this_cache,
- struct frame_id *this_id)
+mips_micro_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
{
- struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
- this_cache);
+ struct mips_frame_cache *info = mips_micro_frame_cache (this_frame,
+ this_cache);
/* This marks the outermost frame. */
if (info->base == 0)
return;
}
static struct value *
-mips_insn16_frame_prev_register (struct frame_info *this_frame,
- void **this_cache, int regnum)
+mips_micro_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
{
- struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
- this_cache);
+ struct mips_frame_cache *info = mips_micro_frame_cache (this_frame,
+ this_cache);
return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
static int
-mips_insn16_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame, void **this_cache)
+mips_micro_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame, void **this_cache)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR pc = get_frame_pc (this_frame);
- if (mips_pc_is_mips16 (pc))
+
+ if (mips_pc_is_micromips (gdbarch, pc))
return 1;
return 0;
}
-static const struct frame_unwind mips_insn16_frame_unwind =
+static const struct frame_unwind mips_micro_frame_unwind =
{
NORMAL_FRAME,
default_frame_unwind_stop_reason,
- mips_insn16_frame_this_id,
- mips_insn16_frame_prev_register,
+ mips_micro_frame_this_id,
+ mips_micro_frame_prev_register,
NULL,
- mips_insn16_frame_sniffer
+ mips_micro_frame_sniffer
};
static CORE_ADDR
-mips_insn16_frame_base_address (struct frame_info *this_frame,
- void **this_cache)
+mips_micro_frame_base_address (struct frame_info *this_frame,
+ void **this_cache)
{
- struct mips_frame_cache *info = mips_insn16_frame_cache (this_frame,
- this_cache);
+ struct mips_frame_cache *info = mips_micro_frame_cache (this_frame,
+ this_cache);
return info->base;
}
-static const struct frame_base mips_insn16_frame_base =
+static const struct frame_base mips_micro_frame_base =
{
- &mips_insn16_frame_unwind,
- mips_insn16_frame_base_address,
- mips_insn16_frame_base_address,
- mips_insn16_frame_base_address
+ &mips_micro_frame_unwind,
+ mips_micro_frame_base_address,
+ mips_micro_frame_base_address,
+ mips_micro_frame_base_address
};
static const struct frame_base *
-mips_insn16_frame_base_sniffer (struct frame_info *this_frame)
+mips_micro_frame_base_sniffer (struct frame_info *this_frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR pc = get_frame_pc (this_frame);
- if (mips_pc_is_mips16 (pc))
- return &mips_insn16_frame_base;
+
+ if (mips_pc_is_micromips (gdbarch, pc))
+ return &mips_micro_frame_base;
else
return NULL;
}
struct frame_info *this_frame,
struct mips_frame_cache *this_cache)
{
- CORE_ADDR cur_pc;
+ int prev_non_prologue_insn;
+ int this_non_prologue_insn;
+ int non_prologue_insns;
CORE_ADDR frame_addr = 0; /* Value of $r30. Used by gcc for
frame-pointer. */
+ int prev_delay_slot;
+ CORE_ADDR prev_pc;
+ CORE_ADDR cur_pc;
CORE_ADDR sp;
long frame_offset;
int frame_reg = MIPS_SP_REGNUM;
- CORE_ADDR end_prologue_addr = 0;
+ CORE_ADDR end_prologue_addr;
int seen_sp_adjust = 0;
int load_immediate_bytes = 0;
- int in_delay_slot = 0;
+ int in_delay_slot;
int regsize_is_64_bits = (mips_abi_regsize (gdbarch) == 8);
/* Can be called when there's no process, and hence when there's no
limit_pc = start_pc + 200;
restart:
-
+ prev_non_prologue_insn = 0;
+ non_prologue_insns = 0;
+ prev_delay_slot = 0;
+ prev_pc = start_pc;
+
+ /* Permit at most one non-prologue non-control-transfer instruction
+ in the middle which may have been reordered by the compiler for
+ optimisation. */
frame_offset = 0;
for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSN32_SIZE)
{
- unsigned long inst, high_word, low_word;
+ unsigned long inst, high_word;
+ long offset;
int reg;
+ this_non_prologue_insn = 0;
+ in_delay_slot = 0;
+
/* Fetch the instruction. */
- inst = (unsigned long) mips_fetch_instruction (gdbarch, cur_pc);
+ inst = (unsigned long) mips_fetch_instruction (gdbarch, ISA_MIPS,
+ cur_pc, NULL);
/* Save some code by pre-extracting some useful fields. */
high_word = (inst >> 16) & 0xffff;
- low_word = inst & 0xffff;
+ offset = ((inst & 0xffff) ^ 0x8000) - 0x8000;
reg = high_word & 0x1f;
if (high_word == 0x27bd /* addiu $sp,$sp,-i */
|| high_word == 0x23bd /* addi $sp,$sp,-i */
|| high_word == 0x67bd) /* daddiu $sp,$sp,-i */
{
- if (low_word & 0x8000) /* Negative stack adjustment? */
- frame_offset += 0x10000 - low_word;
+ if (offset < 0) /* Negative stack adjustment? */
+ frame_offset -= offset;
else
/* Exit loop if a positive stack adjustment is found, which
usually means that the stack cleanup code in the function
else if (((high_word & 0xFFE0) == 0xafa0) /* sw reg,offset($sp) */
&& !regsize_is_64_bits)
{
- set_reg_offset (gdbarch, this_cache, reg, sp + low_word);
+ set_reg_offset (gdbarch, this_cache, reg, sp + offset);
}
else if (((high_word & 0xFFE0) == 0xffa0) /* sd reg,offset($sp) */
&& regsize_is_64_bits)
{
/* Irix 6.2 N32 ABI uses sd instructions for saving $gp and $ra. */
- set_reg_offset (gdbarch, this_cache, reg, sp + low_word);
+ set_reg_offset (gdbarch, this_cache, reg, sp + offset);
}
else if (high_word == 0x27be) /* addiu $30,$sp,size */
{
/* Old gcc frame, r30 is virtual frame pointer. */
- if ((long) low_word != frame_offset)
- frame_addr = sp + low_word;
+ if (offset != frame_offset)
+ frame_addr = sp + offset;
else if (this_frame && frame_reg == MIPS_SP_REGNUM)
{
unsigned alloca_adjust;
frame_reg = 30;
frame_addr = get_frame_register_signed
(this_frame, gdbarch_num_regs (gdbarch) + 30);
+ frame_offset = 0;
- alloca_adjust = (unsigned) (frame_addr - (sp + low_word));
+ alloca_adjust = (unsigned) (frame_addr - (sp + offset));
if (alloca_adjust > 0)
{
/* FP > SP + frame_size. This may be because of
else if ((high_word & 0xFFE0) == 0xafc0 /* sw reg,offset($30) */
&& !regsize_is_64_bits)
{
- set_reg_offset (gdbarch, this_cache, reg, frame_addr + low_word);
+ set_reg_offset (gdbarch, this_cache, reg, frame_addr + offset);
}
else if ((high_word & 0xFFE0) == 0xE7A0 /* swc1 freg,n($sp) */
|| (high_word & 0xF3E0) == 0xA3C0 /* sx reg,n($s8) */
initialize a local variable, so we accept them only before
a stack adjustment instruction was seen. */
else if (!seen_sp_adjust
+ && !prev_delay_slot
&& (high_word == 0x3c01 /* lui $at,n */
|| high_word == 0x3c08 /* lui $t0,n */
|| high_word == 0x3421 /* ori $at,$at,n */
|| high_word == 0x3408 /* ori $t0,$zero,n */
))
{
- if (end_prologue_addr == 0)
- load_immediate_bytes += MIPS_INSN32_SIZE; /* FIXME! */
+ load_immediate_bytes += MIPS_INSN32_SIZE; /* FIXME! */
}
+ /* Check for branches and jumps. The instruction in the delay
+ slot can be a part of the prologue, so move forward once more. */
+ else if (mips32_instruction_has_delay_slot (gdbarch, inst))
+ {
+ in_delay_slot = 1;
+ }
+ /* This instruction is not an instruction typically found
+ in a prologue, so we must have reached the end of the
+ prologue. */
else
{
- /* This instruction is not an instruction typically found
- in a prologue, so we must have reached the end of the
- prologue. */
- /* FIXME: brobecker/2004-10-10: Can't we just break out of this
- loop now? Why would we need to continue scanning the function
- instructions? */
- if (end_prologue_addr == 0)
- end_prologue_addr = cur_pc;
-
- /* Check for branches and jumps. For now, only jump to
- register are caught (i.e. returns). */
- if ((itype_op (inst) & 0x07) == 0 && rtype_funct (inst) == 8)
- in_delay_slot = 1;
+ this_non_prologue_insn = 1;
}
- /* If the previous instruction was a jump, we must have reached
- the end of the prologue by now. Stop scanning so that we do
- not go past the function return. */
- if (in_delay_slot)
+ non_prologue_insns += this_non_prologue_insn;
+
+ /* A jump or branch, or enough non-prologue insns seen? If so,
+ then we must have reached the end of the prologue by now. */
+ if (prev_delay_slot || non_prologue_insns > 1)
break;
+
+ prev_non_prologue_insn = this_non_prologue_insn;
+ prev_delay_slot = in_delay_slot;
+ prev_pc = cur_pc;
}
if (this_cache != NULL)
+ MIPS_RA_REGNUM];
}
- /* If we didn't reach the end of the prologue when scanning the function
- instructions, then set end_prologue_addr to the address of the
- instruction immediately after the last one we scanned. */
- /* brobecker/2004-10-10: I don't think this would ever happen, but
- we may as well be careful and do our best if we have a null
- end_prologue_addr. */
- if (end_prologue_addr == 0)
- end_prologue_addr = cur_pc;
+ /* Set end_prologue_addr to the address of the instruction immediately
+ after the last one we scanned. Unless the last one looked like a
+ non-prologue instruction (and we looked ahead), in which case use
+ its address instead. */
+ end_prologue_addr
+ = prev_non_prologue_insn || prev_delay_slot ? prev_pc : cur_pc;
/* In a frameless function, we might have incorrectly
skipped some load immediate instructions. Undo the skipping
/* Heuristic unwinder for procedures using 32-bit instructions (covers
both 32-bit and 64-bit MIPS ISAs). Procedures using 16-bit
instructions (a.k.a. MIPS16) are handled by the mips_insn16
- unwinder. */
+ unwinder. Likewise microMIPS and the mips_micro unwinder. */
static struct mips_frame_cache *
mips_insn32_frame_cache (struct frame_info *this_frame, void **this_cache)
struct mips_frame_cache *cache;
if ((*this_cache) != NULL)
- return (*this_cache);
+ return (struct mips_frame_cache *) (*this_cache);
cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
(*this_cache) = cache;
if (start_addr == 0)
return cache;
- mips32_scan_prologue (gdbarch, start_addr, pc, this_frame, *this_cache);
+ mips32_scan_prologue (gdbarch, start_addr, pc, this_frame,
+ (struct mips_frame_cache *) *this_cache);
}
/* gdbarch_sp_regnum contains the value and not the address. */
gdbarch_num_regs (gdbarch) + MIPS_SP_REGNUM,
cache->base);
- return (*this_cache);
+ return (struct mips_frame_cache *) (*this_cache);
}
static void
struct frame_info *this_frame, void **this_cache)
{
CORE_ADDR pc = get_frame_pc (this_frame);
- if (! mips_pc_is_mips16 (pc))
+ if (mips_pc_is_mips (pc))
return 1;
return 0;
}
mips_insn32_frame_base_sniffer (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
- if (! mips_pc_is_mips16 (pc))
+ if (mips_pc_is_mips (pc))
return &mips_insn32_frame_base;
else
return NULL;
int num_regs = gdbarch_num_regs (gdbarch);
if ((*this_cache) != NULL)
- return (*this_cache);
+ return (struct trad_frame_cache *) (*this_cache);
this_trad_cache = trad_frame_cache_zalloc (this_frame);
(*this_cache) = this_trad_cache;
struct frame_info *this_frame, void **this_cache)
{
gdb_byte dummy[4];
- struct obj_section *s;
CORE_ADDR pc = get_frame_address_in_block (this_frame);
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
/* Use the stub unwinder for unreadable code. */
if (target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0)
return 1;
- if (in_plt_section (pc, NULL))
- return 1;
-
- /* Binutils for MIPS puts lazy resolution stubs into .MIPS.stubs. */
- s = find_pc_section (pc);
-
- if (s != NULL
- && strcmp (bfd_get_section_name (s->objfile->obfd, s->the_bfd_section),
- ".MIPS.stubs") == 0)
+ if (in_plt_section (pc) || in_mips_stubs_section (pc))
return 1;
/* Calling a PIC function from a non-PIC function passes through a
stub. The stub for foo is named ".pic.foo". */
msym = lookup_minimal_symbol_by_pc (pc);
- if (msym != NULL
- && SYMBOL_LINKAGE_NAME (msym) != NULL
- && strncmp (SYMBOL_LINKAGE_NAME (msym), ".pic.", 5) == 0)
+ if (msym.minsym != NULL
+ && msym.minsym->linkage_name () != NULL
+ && startswith (msym.minsym->linkage_name (), ".pic."))
return 1;
return 0;
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (is_mips16_addr (addr))
- addr = unmake_mips16_addr (addr);
-
if (mips_mask_address_p (tdep) && (((ULONGEST) addr) >> 32 == 0xffffffffUL))
/* This hack is a work-around for existing boards using PMON, the
simulator, and any other 64-bit targets that doesn't have true
return addr;
}
-/* Instructions used during single-stepping of atomic sequences. */
-#define LL_OPCODE 0x30
-#define LLD_OPCODE 0x34
-#define SC_OPCODE 0x38
-#define SCD_OPCODE 0x3c
/* Checks for an atomic sequence of instructions beginning with a LL/LLD
instruction and ending with a SC/SCD instruction. If such a sequence
is found, attempt to step through it. A breakpoint is placed at the end of
the sequence. */
-static int
-deal_with_atomic_sequence (struct gdbarch *gdbarch,
- struct address_space *aspace, CORE_ADDR pc)
+/* Instructions used during single-stepping of atomic sequences, standard
+ ISA version. */
+#define LL_OPCODE 0x30
+#define LLD_OPCODE 0x34
+#define SC_OPCODE 0x38
+#define SCD_OPCODE 0x3c
+
+static std::vector<CORE_ADDR>
+mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- CORE_ADDR breaks[2] = {-1, -1};
+ CORE_ADDR breaks[2] = {CORE_ADDR_MAX, CORE_ADDR_MAX};
CORE_ADDR loc = pc;
CORE_ADDR branch_bp; /* Breakpoint at branch instruction's destination. */
- unsigned long insn;
+ ULONGEST 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. */
- if (pc & 0x01)
- return 0;
-
- insn = mips_fetch_instruction (gdbarch, loc);
+ insn = mips_fetch_instruction (gdbarch, ISA_MIPS, loc, NULL);
/* Assume all atomic sequences start with a ll/lld instruction. */
if (itype_op (insn) != LL_OPCODE && itype_op (insn) != LLD_OPCODE)
- return 0;
+ return {};
/* Assume that no atomic sequence is longer than "atomic_sequence_length"
instructions. */
{
int is_branch = 0;
loc += MIPS_INSN32_SIZE;
- insn = mips_fetch_instruction (gdbarch, loc);
+ insn = mips_fetch_instruction (gdbarch, ISA_MIPS, loc, NULL);
/* Assume that there is at most one branch in the atomic
sequence. If a branch is found, put a breakpoint in its
{
case 0: /* SPECIAL */
if (rtype_funct (insn) >> 1 == 4) /* JR, JALR */
- return 0; /* fallback to the standard single-step code. */
+ return {}; /* fallback to the standard single-step code. */
break;
case 1: /* REGIMM */
is_branch = ((itype_rt (insn) & 0xc) == 0 /* B{LT,GE}Z* */
break;
case 2: /* J */
case 3: /* JAL */
- return 0; /* fallback to the standard single-step code. */
+ return {}; /* fallback to the standard single-step code. */
case 4: /* BEQ */
case 5: /* BNE */
case 6: /* BLEZ */
{
branch_bp = loc + mips32_relative_offset (insn) + 4;
if (last_breakpoint >= 1)
- return 0; /* More than one branch found, fallback to the
- standard single-step code. */
+ return {}; /* More than one branch found, fallback to the
+ standard single-step code. */
breaks[1] = branch_bp;
last_breakpoint++;
}
/* Assume that the atomic sequence ends with a sc/scd instruction. */
if (itype_op (insn) != SC_OPCODE && itype_op (insn) != SCD_OPCODE)
- return 0;
+ return {};
loc += MIPS_INSN32_SIZE;
if (last_breakpoint && pc <= breaks[1] && breaks[1] <= breaks[0])
last_breakpoint = 0;
+ std::vector<CORE_ADDR> next_pcs;
+
/* Effectively inserts the breakpoints. */
for (index = 0; index <= last_breakpoint; index++)
- insert_single_step_breakpoint (gdbarch, aspace, breaks[index]);
+ next_pcs.push_back (breaks[index]);
- return 1;
+ return next_pcs;
+}
+
+static std::vector<CORE_ADDR>
+micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
+ CORE_ADDR pc)
+{
+ const int atomic_sequence_length = 16; /* Instruction sequence length. */
+ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
+ CORE_ADDR breaks[2] = {CORE_ADDR_MAX, CORE_ADDR_MAX};
+ CORE_ADDR branch_bp = 0; /* Breakpoint at branch instruction's
+ destination. */
+ CORE_ADDR loc = pc;
+ int sc_found = 0;
+ ULONGEST insn;
+ int insn_count;
+ int index;
+
+ /* Assume all atomic sequences start with a ll/lld instruction. */
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, loc, NULL);
+ if (micromips_op (insn) != 0x18) /* POOL32C: bits 011000 */
+ return {};
+ loc += MIPS_INSN16_SIZE;
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch, ISA_MICROMIPS, loc, NULL);
+ if ((b12s4_op (insn) & 0xb) != 0x3) /* LL, LLD: bits 011000 0x11 */
+ return {};
+ loc += MIPS_INSN16_SIZE;
+
+ /* Assume all atomic sequences end with an sc/scd instruction. Assume
+ that no atomic sequence is longer than "atomic_sequence_length"
+ instructions. */
+ for (insn_count = 0;
+ !sc_found && insn_count < atomic_sequence_length;
+ ++insn_count)
+ {
+ int is_branch = 0;
+
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, loc, NULL);
+ loc += MIPS_INSN16_SIZE;
+
+ /* Assume that there is at most one conditional branch in the
+ atomic sequence. If a branch is found, put a breakpoint in
+ its destination address. */
+ switch (mips_insn_size (ISA_MICROMIPS, insn))
+ {
+ /* 32-bit instructions. */
+ case 2 * MIPS_INSN16_SIZE:
+ switch (micromips_op (insn))
+ {
+ case 0x10: /* POOL32I: bits 010000 */
+ if ((b5s5_op (insn) & 0x18) != 0x0
+ /* BLTZ, BLTZAL, BGEZ, BGEZAL: 010000 000xx */
+ /* BLEZ, BNEZC, BGTZ, BEQZC: 010000 001xx */
+ && (b5s5_op (insn) & 0x1d) != 0x11
+ /* BLTZALS, BGEZALS: bits 010000 100x1 */
+ && ((b5s5_op (insn) & 0x1e) != 0x14
+ || (insn & 0x3) != 0x0)
+ /* BC2F, BC2T: bits 010000 1010x xxx00 */
+ && (b5s5_op (insn) & 0x1e) != 0x1a
+ /* BPOSGE64, BPOSGE32: bits 010000 1101x */
+ && ((b5s5_op (insn) & 0x1e) != 0x1c
+ || (insn & 0x3) != 0x0)
+ /* BC1F, BC1T: bits 010000 1110x xxx00 */
+ && ((b5s5_op (insn) & 0x1c) != 0x1c
+ || (insn & 0x3) != 0x1))
+ /* BC1ANY*: bits 010000 111xx xxx01 */
+ break;
+ /* Fall through. */
+
+ case 0x25: /* BEQ: bits 100101 */
+ case 0x2d: /* BNE: bits 101101 */
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch,
+ ISA_MICROMIPS, loc, NULL);
+ branch_bp = (loc + MIPS_INSN16_SIZE
+ + micromips_relative_offset16 (insn));
+ is_branch = 1;
+ break;
+
+ case 0x00: /* POOL32A: bits 000000 */
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch,
+ ISA_MICROMIPS, loc, NULL);
+ if (b0s6_op (insn) != 0x3c
+ /* POOL32Axf: bits 000000 ... 111100 */
+ || (b6s10_ext (insn) & 0x2bf) != 0x3c)
+ /* JALR, JALR.HB: 000000 000x111100 111100 */
+ /* JALRS, JALRS.HB: 000000 010x111100 111100 */
+ break;
+ /* Fall through. */
+
+ case 0x1d: /* JALS: bits 011101 */
+ case 0x35: /* J: bits 110101 */
+ case 0x3d: /* JAL: bits 111101 */
+ case 0x3c: /* JALX: bits 111100 */
+ return {}; /* Fall back to the standard single-step code. */
+
+ case 0x18: /* POOL32C: bits 011000 */
+ if ((b12s4_op (insn) & 0xb) == 0xb)
+ /* SC, SCD: bits 011000 1x11 */
+ sc_found = 1;
+ break;
+ }
+ loc += MIPS_INSN16_SIZE;
+ break;
+
+ /* 16-bit instructions. */
+ case MIPS_INSN16_SIZE:
+ switch (micromips_op (insn))
+ {
+ case 0x23: /* BEQZ16: bits 100011 */
+ case 0x2b: /* BNEZ16: bits 101011 */
+ branch_bp = loc + micromips_relative_offset7 (insn);
+ is_branch = 1;
+ break;
+
+ case 0x11: /* POOL16C: bits 010001 */
+ if ((b5s5_op (insn) & 0x1c) != 0xc
+ /* JR16, JRC, JALR16, JALRS16: 010001 011xx */
+ && b5s5_op (insn) != 0x18)
+ /* JRADDIUSP: bits 010001 11000 */
+ break;
+ return {}; /* Fall back to the standard single-step code. */
+
+ case 0x33: /* B16: bits 110011 */
+ return {}; /* Fall back to the standard single-step code. */
+ }
+ break;
+ }
+ if (is_branch)
+ {
+ if (last_breakpoint >= 1)
+ return {}; /* More than one branch found, fallback to the
+ standard single-step code. */
+ breaks[1] = branch_bp;
+ last_breakpoint++;
+ }
+ }
+ if (!sc_found)
+ return {};
+
+ /* 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) in the atomic sequence */
+ if (last_breakpoint && pc <= breaks[1] && breaks[1] <= breaks[0])
+ last_breakpoint = 0;
+
+ std::vector<CORE_ADDR> next_pcs;
+
+ /* Effectively inserts the breakpoints. */
+ for (index = 0; index <= last_breakpoint; index++)
+ next_pcs.push_back (breaks[index]);
+
+ return next_pcs;
+}
+
+static std::vector<CORE_ADDR>
+deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ if (mips_pc_is_mips (pc))
+ return mips_deal_with_atomic_sequence (gdbarch, pc);
+ else if (mips_pc_is_micromips (gdbarch, pc))
+ return micromips_deal_with_atomic_sequence (gdbarch, pc);
+ else
+ return {};
}
/* mips_software_single_step() is called just before we want to resume
or kernel single-step support (MIPS on GNU/Linux for example). We find
the target of the coming instruction and breakpoint it. */
-int
-mips_software_single_step (struct frame_info *frame)
+std::vector<CORE_ADDR>
+mips_software_single_step (struct regcache *regcache)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct address_space *aspace = get_frame_address_space (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
CORE_ADDR pc, next_pc;
- pc = get_frame_pc (frame);
- if (deal_with_atomic_sequence (gdbarch, aspace, pc))
- return 1;
+ pc = regcache_read_pc (regcache);
+ std::vector<CORE_ADDR> next_pcs = deal_with_atomic_sequence (gdbarch, pc);
- next_pc = mips_next_pc (frame, pc);
+ if (!next_pcs.empty ())
+ return next_pcs;
- insert_single_step_breakpoint (gdbarch, aspace, next_pc);
- return 1;
+ next_pc = mips_next_pc (regcache, pc);
+
+ return {next_pc};
}
/* Test whether the PC points to the return instruction at the
ULONGEST hint;
/* This used to check for MIPS16, but this piece of code is never
- called for MIPS16 functions. */
- gdb_assert (!mips_pc_is_mips16 (pc));
+ called for MIPS16 functions. And likewise microMIPS ones. */
+ gdb_assert (mips_pc_is_mips (pc));
- insn = mips_fetch_instruction (gdbarch, pc);
+ insn = mips_fetch_instruction (gdbarch, ISA_MIPS, pc, NULL);
hint = 0x7c0;
return (insn & ~hint) == 0x3e00008; /* jr(.hb) $ra */
}
if (start_pc == 0)
return 0;
- if (heuristic_fence_post == UINT_MAX || fence < VM_MIN_ADDRESS)
+ if (heuristic_fence_post == -1 || fence < VM_MIN_ADDRESS)
fence = VM_MIN_ADDRESS;
- instlen = mips_pc_is_mips16 (pc) ? MIPS_INSN16_SIZE : MIPS_INSN32_SIZE;
+ instlen = mips_pc_is_mips (pc) ? MIPS_INSN32_SIZE : MIPS_INSN16_SIZE;
inf = current_inferior ();
return 0;
}
- else if (mips_pc_is_mips16 (start_pc))
+ else if (mips_pc_is_mips16 (gdbarch, start_pc))
{
unsigned short inst;
addiu sp,-n
daddiu sp,-n
extend -n followed by 'addiu sp,+n' or 'daddiu sp,+n'. */
- inst = mips_fetch_instruction (gdbarch, start_pc);
+ inst = mips_fetch_instruction (gdbarch, ISA_MIPS16, start_pc, NULL);
if ((inst & 0xff80) == 0x6480) /* save */
{
if (start_pc - instlen >= fence)
{
- inst = mips_fetch_instruction (gdbarch, start_pc - instlen);
+ inst = mips_fetch_instruction (gdbarch, ISA_MIPS16,
+ start_pc - instlen, NULL);
if ((inst & 0xf800) == 0xf000) /* extend */
start_pc -= instlen;
}
else
seen_adjsp = 0;
}
+ else if (mips_pc_is_micromips (gdbarch, start_pc))
+ {
+ ULONGEST insn;
+ int stop = 0;
+ long offset;
+ int dreg;
+ int sreg;
+
+ /* On microMIPS, any one of the following is likely to be the
+ start of a function:
+ ADDIUSP -imm
+ (D)ADDIU $sp, -imm
+ LUI $gp, imm */
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, NULL);
+ switch (micromips_op (insn))
+ {
+ case 0xc: /* ADDIU: bits 001100 */
+ case 0x17: /* DADDIU: bits 010111 */
+ sreg = b0s5_reg (insn);
+ dreg = b5s5_reg (insn);
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch, ISA_MICROMIPS,
+ pc + MIPS_INSN16_SIZE, NULL);
+ offset = (b0s16_imm (insn) ^ 0x8000) - 0x8000;
+ if (sreg == MIPS_SP_REGNUM && dreg == MIPS_SP_REGNUM
+ /* (D)ADDIU $sp, imm */
+ && offset < 0)
+ stop = 1;
+ break;
+
+ case 0x10: /* POOL32I: bits 010000 */
+ if (b5s5_op (insn) == 0xd
+ /* LUI: bits 010000 001101 */
+ && b0s5_reg (insn >> 16) == 28)
+ /* LUI $gp, imm */
+ stop = 1;
+ break;
+
+ case 0x13: /* POOL16D: bits 010011 */
+ if ((insn & 0x1) == 0x1)
+ /* ADDIUSP: bits 010011 1 */
+ {
+ offset = micromips_decode_imm9 (b1s9_imm (insn));
+ if (offset < 0)
+ /* ADDIUSP -imm */
+ stop = 1;
+ }
+ else
+ /* ADDIUS5: bits 010011 0 */
+ {
+ dreg = b5s5_reg (insn);
+ offset = (b1s4_imm (insn) ^ 8) - 8;
+ if (dreg == MIPS_SP_REGNUM && offset < 0)
+ /* ADDIUS5 $sp, -imm */
+ stop = 1;
+ }
+ break;
+ }
+ if (stop)
+ break;
+ }
else if (mips_about_to_return (gdbarch, start_pc))
{
/* Skip return and its delay slot. */
CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
struct regcache *regcache)
{
- CORE_ADDR nop_addr;
static gdb_byte nop_insn[] = { 0, 0, 0, 0 };
+ CORE_ADDR nop_addr;
+ CORE_ADDR bp_slot;
/* Reserve enough room on the stack for our breakpoint instruction. */
- *bp_addr = sp - sizeof (nop_insn);
+ bp_slot = sp - sizeof (nop_insn);
+
+ /* Return to microMIPS mode if calling microMIPS code to avoid
+ triggering an address error exception on processors that only
+ support microMIPS execution. */
+ *bp_addr = (mips_pc_is_micromips (gdbarch, funaddr)
+ ? make_compact_addr (bp_slot) : bp_slot);
/* The breakpoint layer automatically adjusts the address of
breakpoints inserted in a branch delay slot. With enough
trigger the adjustement, and break the function call entirely.
So, we reserve those 4 bytes and write a nop instruction
to prevent that from happening. */
- nop_addr = *bp_addr - sizeof (nop_insn);
+ nop_addr = bp_slot - sizeof (nop_insn);
write_memory (nop_addr, nop_insn, sizeof (nop_insn));
sp = mips_frame_align (gdbarch, nop_addr);
mips_eabi_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)
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
int argreg;
int float_argreg;
int argnum;
- int len = 0;
+ int arg_space = 0;
int stack_offset = 0;
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR func_addr = find_function_addr (function, NULL);
- int regsize = mips_abi_regsize (gdbarch);
+ int abi_regsize = mips_abi_regsize (gdbarch);
/* For shared libraries, "t9" needs to point at the function
address. */
than necessary for EABI, because the first few arguments are
passed in registers, but that's OK. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (value_type (args[argnum])), regsize);
- sp -= align_up (len, 16);
+ arg_space += align_up (TYPE_LENGTH (value_type (args[argnum])), abi_regsize);
+ sp -= align_up (arg_space, 16);
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
"mips_eabi_push_dummy_call: sp=%s allocated %ld\n",
- paddress (gdbarch, sp), (long) align_up (len, 16));
+ paddress (gdbarch, sp),
+ (long) align_up (arg_space, 16));
/* Initialize the integer and float register pointers. */
argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
for (argnum = 0; argnum < nargs; argnum++)
{
const gdb_byte *val;
- gdb_byte valbuf[MAX_REGISTER_SIZE];
+ /* This holds the address of structures that are passed by
+ reference. */
+ gdb_byte ref_valbuf[MAX_MIPS_ABI_REGSIZE];
struct value *arg = args[argnum];
struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
"mips_eabi_push_dummy_call: %d len=%d type=%d",
argnum + 1, len, (int) typecode);
- /* Function pointer arguments to mips16 code need to be made into
- mips16 pointers. */
- if (typecode == TYPE_CODE_PTR
- && TYPE_CODE (TYPE_TARGET_TYPE (arg_type)) == TYPE_CODE_FUNC)
- {
- CORE_ADDR addr = extract_signed_integer (value_contents (arg),
- len, byte_order);
- if (mips_pc_is_mips16 (addr))
- {
- store_signed_integer (valbuf, len, byte_order,
- make_mips16_addr (addr));
- val = valbuf;
- }
- else
- val = value_contents (arg);
- }
/* The EABI passes structures that do not fit in a register by
reference. */
- else if (len > regsize
+ if (len > abi_regsize
&& (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION))
{
- store_unsigned_integer (valbuf, regsize, byte_order,
+ gdb_assert (abi_regsize <= ARRAY_SIZE (ref_valbuf));
+ store_unsigned_integer (ref_valbuf, abi_regsize, byte_order,
value_address (arg));
typecode = TYPE_CODE_PTR;
- len = regsize;
- val = valbuf;
+ len = abi_regsize;
+ val = ref_valbuf;
if (mips_debug)
fprintf_unfiltered (gdb_stdlog, " push");
}
up before the check to see if there are any FP registers
left. Non MIPS_EABI targets also pass the FP in the integer
registers so also round up normal registers. */
- if (regsize < 8 && fp_register_arg_p (gdbarch, typecode, arg_type))
+ if (abi_regsize < 8 && fp_register_arg_p (gdbarch, typecode, arg_type))
{
if ((float_argreg & 1))
float_argreg++;
/* Copy the argument to general registers or the stack in
register-sized pieces. Large arguments are split between
registers and stack. */
- /* Note: structs whose size is not a multiple of regsize
+ /* Note: structs whose size is not a multiple of abi_regsize
are treated specially: Irix cc passes
them in registers where gcc sometimes puts them on the
stack. For maximum compatibility, we will put them in
both places. */
- int odd_sized_struct = (len > regsize && len % regsize != 0);
+ int odd_sized_struct = (len > abi_regsize && len % abi_regsize != 0);
/* Note: Floating-point values that didn't fit into an FP
register are only written to memory. */
{
/* Remember if the argument was written to the stack. */
int stack_used_p = 0;
- int partial_len = (len < regsize ? len : regsize);
+ int partial_len = (len < abi_regsize ? len : abi_regsize);
if (mips_debug)
fprintf_unfiltered (gdb_stdlog, " -- partial=%d",
stack_used_p = 1;
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
{
- if (regsize == 8
+ if (abi_regsize == 8
&& (typecode == TYPE_CODE_INT
|| typecode == TYPE_CODE_PTR
|| typecode == TYPE_CODE_FLT) && len <= 4)
- longword_offset = regsize - len;
+ longword_offset = abi_regsize - len;
else if ((typecode == TYPE_CODE_STRUCT
|| typecode == TYPE_CODE_UNION)
- && TYPE_LENGTH (arg_type) < regsize)
- longword_offset = regsize - len;
+ && TYPE_LENGTH (arg_type) < abi_regsize)
+ longword_offset = abi_regsize - len;
}
if (mips_debug)
if (mips_debug)
fprintf_filtered (gdb_stdlog, " - reg=%d val=%s",
argreg,
- phex (regval, regsize));
+ phex (regval, abi_regsize));
regcache_cooked_write_signed (regcache, argreg, regval);
argreg++;
}
only needs to be adjusted when it has been used. */
if (stack_used_p)
- stack_offset += align_up (partial_len, regsize);
+ stack_offset += align_up (partial_len, abi_regsize);
}
}
if (mips_debug)
mips_n32n64_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)
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
int argreg;
int float_argreg;
int argnum;
- int len = 0;
+ int arg_space = 0;
int stack_offset = 0;
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR func_addr = find_function_addr (function, NULL);
/* Now make space on the stack for the args. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (value_type (args[argnum])), MIPS64_REGSIZE);
- sp -= align_up (len, 16);
+ arg_space += align_up (TYPE_LENGTH (value_type (args[argnum])), MIPS64_REGSIZE);
+ sp -= align_up (arg_space, 16);
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
"mips_n32n64_push_dummy_call: sp=%s allocated %ld\n",
- paddress (gdbarch, sp), (long) align_up (len, 16));
+ paddress (gdbarch, sp),
+ (long) align_up (arg_space, 16));
/* Initialize the integer and float register pointers. */
argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
mips_o32_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)
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
int argreg;
int float_argreg;
int argnum;
- int len = 0;
+ int arg_space = 0;
int stack_offset = 0;
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR func_addr = find_function_addr (function, NULL);
for (argnum = 0; argnum < nargs; argnum++)
{
struct type *arg_type = check_typedef (value_type (args[argnum]));
- int arglen = TYPE_LENGTH (arg_type);
/* Align to double-word if necessary. */
if (mips_type_needs_double_align (arg_type))
- len = align_up (len, MIPS32_REGSIZE * 2);
+ arg_space = align_up (arg_space, MIPS32_REGSIZE * 2);
/* Allocate space on the stack. */
- len += align_up (arglen, MIPS32_REGSIZE);
+ arg_space += align_up (TYPE_LENGTH (arg_type), MIPS32_REGSIZE);
}
- sp -= align_up (len, 16);
+ sp -= align_up (arg_space, 16);
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
"mips_o32_push_dummy_call: sp=%s allocated %ld\n",
- paddress (gdbarch, sp), (long) align_up (len, 16));
+ paddress (gdbarch, sp),
+ (long) align_up (arg_space, 16));
/* Initialize the integer and float register pointers. */
argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
}
while (len > 0)
{
- /* Remember if the argument was written to the stack. */
- int stack_used_p = 0;
int partial_len = (len < MIPS32_REGSIZE ? len : MIPS32_REGSIZE);
if (mips_debug)
promoted to int before being stored? */
int longword_offset = 0;
CORE_ADDR addr;
- stack_used_p = 1;
if (mips_debug)
{
gdb_byte *readbuf, const gdb_byte *writebuf)
{
CORE_ADDR func_addr = function ? find_function_addr (function, NULL) : 0;
+ int mips16 = mips_pc_is_mips16 (gdbarch, func_addr);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- int mips16 = mips_pc_is_mips16 (func_addr);
enum mips_fval_reg fval_reg;
fval_reg = readbuf ? mips16 ? mips_fval_gpr : mips_fval_fpr : mips_fval_both;
/* A struct that contains one or two floats. Each value is part
in the least significant part of their floating point
register.. */
- gdb_byte reg[MAX_REGISTER_SIZE];
int regnum;
int field;
for (field = 0, regnum = mips_regnum (gdbarch)->fp0;
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs,
struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+ function_call_return_method return_method, CORE_ADDR struct_addr)
{
int argreg;
int float_argreg;
int argnum;
- int len = 0;
+ int arg_space = 0;
int stack_offset = 0;
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR func_addr = find_function_addr (function, NULL);
for (argnum = 0; argnum < nargs; argnum++)
{
struct type *arg_type = check_typedef (value_type (args[argnum]));
- int arglen = TYPE_LENGTH (arg_type);
/* Allocate space on the stack. */
- len += align_up (arglen, MIPS64_REGSIZE);
+ arg_space += align_up (TYPE_LENGTH (arg_type), MIPS64_REGSIZE);
}
- sp -= align_up (len, 16);
+ sp -= align_up (arg_space, 16);
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
"mips_o64_push_dummy_call: sp=%s allocated %ld\n",
- paddress (gdbarch, sp), (long) align_up (len, 16));
+ paddress (gdbarch, sp),
+ (long) align_up (arg_space, 16));
/* Initialize the integer and float register pointers. */
argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
if (mips_debug)
fprintf_unfiltered (gdb_stdlog,
for (argnum = 0; argnum < nargs; argnum++)
{
const gdb_byte *val;
- gdb_byte valbuf[MAX_REGISTER_SIZE];
struct value *arg = args[argnum];
struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
val = value_contents (arg);
- /* Function pointer arguments to mips16 code need to be made into
- mips16 pointers. */
- if (typecode == TYPE_CODE_PTR
- && TYPE_CODE (TYPE_TARGET_TYPE (arg_type)) == TYPE_CODE_FUNC)
- {
- CORE_ADDR addr = extract_signed_integer (value_contents (arg),
- len, byte_order);
- if (mips_pc_is_mips16 (addr))
- {
- store_signed_integer (valbuf, len, byte_order,
- make_mips16_addr (addr));
- val = valbuf;
- }
- }
-
/* Floating point arguments passed in registers have to be
treated specially. On 32-bit architectures, doubles are
passed in register pairs; the even FP register gets the
&& len % MIPS64_REGSIZE != 0);
while (len > 0)
{
- /* Remember if the argument was written to the stack. */
- int stack_used_p = 0;
int partial_len = (len < MIPS64_REGSIZE ? len : MIPS64_REGSIZE);
if (mips_debug)
promoted to int before being stored? */
int longword_offset = 0;
CORE_ADDR addr;
- stack_used_p = 1;
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
{
if ((typecode == TYPE_CODE_INT
gdb_byte *readbuf, const gdb_byte *writebuf)
{
CORE_ADDR func_addr = function ? find_function_addr (function, NULL) : 0;
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- int mips16 = mips_pc_is_mips16 (func_addr);
+ int mips16 = mips_pc_is_mips16 (gdbarch, func_addr);
enum mips_fval_reg fval_reg;
fval_reg = readbuf ? mips16 ? mips_fval_gpr : mips_fval_fpr : mips_fval_both;
{
struct gdbarch *gdbarch = get_frame_arch (frame);
int raw_size = register_size (gdbarch, regno);
- gdb_byte *raw_buffer = alloca (raw_size);
+ gdb_byte *raw_buffer = (gdb_byte *) alloca (raw_size);
- if (!frame_register_read (frame, regno, raw_buffer))
+ if (!deprecated_frame_register_read (frame, regno, raw_buffer))
error (_("can't read register %d (%s)"),
regno, gdbarch_register_name (gdbarch, regno));
if (raw_size == 8)
{
/* We have a 64-bit value for this register, and we should use
all 64 bits. */
- if (!frame_register_read (frame, regno, rare_buffer))
+ if (!deprecated_frame_register_read (frame, regno, rare_buffer))
error (_("can't read register %d (%s)"),
regno, gdbarch_register_name (gdbarch, regno));
}
{ /* Do values for FP (float) regs. */
struct gdbarch *gdbarch = get_frame_arch (frame);
gdb_byte *raw_buffer;
- double doub, flt1; /* Doubles extracted from raw hex data. */
- int inv1, inv2;
+ std::string flt_str, dbl_str;
- raw_buffer = alloca (2 * register_size (gdbarch,
- mips_regnum (gdbarch)->fp0));
+ const struct type *flt_type = builtin_type (gdbarch)->builtin_float;
+ const struct type *dbl_type = builtin_type (gdbarch)->builtin_double;
+
+ raw_buffer
+ = ((gdb_byte *)
+ alloca (2 * register_size (gdbarch, mips_regnum (gdbarch)->fp0)));
fprintf_filtered (file, "%s:", gdbarch_register_name (gdbarch, regnum));
fprintf_filtered (file, "%*s",
/* 4-byte registers: Print hex and floating. Also print even
numbered registers as doubles. */
mips_read_fp_register_single (frame, regnum, raw_buffer);
- flt1 = unpack_double (builtin_type (gdbarch)->builtin_float,
- raw_buffer, &inv1);
+ flt_str = target_float_to_string (raw_buffer, flt_type, "%-17.9g");
get_formatted_print_options (&opts, 'x');
print_scalar_formatted (raw_buffer,
builtin_type (gdbarch)->builtin_uint32,
&opts, 'w', file);
- fprintf_filtered (file, " flt: ");
- if (inv1)
- fprintf_filtered (file, " <invalid float> ");
- else
- fprintf_filtered (file, "%-17.9g", flt1);
+ fprintf_filtered (file, " flt: %s", flt_str.c_str ());
if ((regnum - gdbarch_num_regs (gdbarch)) % 2 == 0)
{
mips_read_fp_register_double (frame, regnum, raw_buffer);
- doub = unpack_double (builtin_type (gdbarch)->builtin_double,
- raw_buffer, &inv2);
+ dbl_str = target_float_to_string (raw_buffer, dbl_type, "%-24.17g");
- fprintf_filtered (file, " dbl: ");
- if (inv2)
- fprintf_filtered (file, "<invalid double>");
- else
- fprintf_filtered (file, "%-24.17g", doub);
+ fprintf_filtered (file, " dbl: %s", dbl_str.c_str ());
}
}
else
/* Eight byte registers: print each one as hex, float and double. */
mips_read_fp_register_single (frame, regnum, raw_buffer);
- flt1 = unpack_double (builtin_type (gdbarch)->builtin_float,
- raw_buffer, &inv1);
+ flt_str = target_float_to_string (raw_buffer, flt_type, "%-17.9g");
mips_read_fp_register_double (frame, regnum, raw_buffer);
- doub = unpack_double (builtin_type (gdbarch)->builtin_double,
- raw_buffer, &inv2);
+ dbl_str = target_float_to_string (raw_buffer, dbl_type, "%-24.17g");
get_formatted_print_options (&opts, 'x');
print_scalar_formatted (raw_buffer,
builtin_type (gdbarch)->builtin_uint64,
&opts, 'g', file);
- fprintf_filtered (file, " flt: ");
- if (inv1)
- fprintf_filtered (file, "<invalid float>");
- else
- fprintf_filtered (file, "%-17.9g", flt1);
-
- fprintf_filtered (file, " dbl: ");
- if (inv2)
- fprintf_filtered (file, "<invalid double>");
- else
- fprintf_filtered (file, "%-24.17g", doub);
+ fprintf_filtered (file, " flt: %s", flt_str.c_str ());
+ fprintf_filtered (file, " dbl: %s", dbl_str.c_str ());
}
}
}
val = get_frame_register_value (frame, regnum);
- if (value_optimized_out (val))
- {
- fprintf_filtered (file, "%s: [Invalid]",
- gdbarch_register_name (gdbarch, regnum));
- return;
- }
fputs_filtered (gdbarch_register_name (gdbarch, regnum), file);
get_formatted_print_options (&opts, 'x');
val_print_scalar_formatted (value_type (val),
- value_contents_for_printing (val),
value_embedded_offset (val),
val,
&opts, 0, file);
}
+/* Print IEEE exception condition bits in FLAGS. */
+
+static void
+print_fpu_flags (struct ui_file *file, int flags)
+{
+ if (flags & (1 << 0))
+ fputs_filtered (" inexact", file);
+ if (flags & (1 << 1))
+ fputs_filtered (" uflow", file);
+ if (flags & (1 << 2))
+ fputs_filtered (" oflow", file);
+ if (flags & (1 << 3))
+ fputs_filtered (" div0", file);
+ if (flags & (1 << 4))
+ fputs_filtered (" inval", file);
+ if (flags & (1 << 5))
+ fputs_filtered (" unimp", file);
+ fputc_filtered ('\n', file);
+}
+
+/* Print interesting information about the floating point processor
+ (if present) or emulator. */
+
+static void
+mips_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
+ struct frame_info *frame, const char *args)
+{
+ int fcsr = mips_regnum (gdbarch)->fp_control_status;
+ enum mips_fpu_type type = MIPS_FPU_TYPE (gdbarch);
+ ULONGEST fcs = 0;
+ int i;
+
+ if (fcsr == -1 || !read_frame_register_unsigned (frame, fcsr, &fcs))
+ type = MIPS_FPU_NONE;
+
+ fprintf_filtered (file, "fpu type: %s\n",
+ type == MIPS_FPU_DOUBLE ? "double-precision"
+ : type == MIPS_FPU_SINGLE ? "single-precision"
+ : "none / unused");
+
+ if (type == MIPS_FPU_NONE)
+ return;
+
+ fprintf_filtered (file, "reg size: %d bits\n",
+ register_size (gdbarch, mips_regnum (gdbarch)->fp0) * 8);
+
+ fputs_filtered ("cond :", file);
+ if (fcs & (1 << 23))
+ fputs_filtered (" 0", file);
+ for (i = 1; i <= 7; i++)
+ if (fcs & (1 << (24 + i)))
+ fprintf_filtered (file, " %d", i);
+ fputc_filtered ('\n', file);
+
+ fputs_filtered ("cause :", file);
+ print_fpu_flags (file, (fcs >> 12) & 0x3f);
+ fputs ("mask :", stdout);
+ print_fpu_flags (file, (fcs >> 7) & 0x1f);
+ fputs ("flags :", stdout);
+ print_fpu_flags (file, (fcs >> 2) & 0x1f);
+
+ fputs_filtered ("rounding: ", file);
+ switch (fcs & 3)
+ {
+ case 0: fputs_filtered ("nearest\n", file); break;
+ case 1: fputs_filtered ("zero\n", file); break;
+ case 2: fputs_filtered ("+inf\n", file); break;
+ case 3: fputs_filtered ("-inf\n", file); break;
+ }
+
+ fputs_filtered ("flush :", file);
+ if (fcs & (1 << 21))
+ fputs_filtered (" nearest", file);
+ if (fcs & (1 << 22))
+ fputs_filtered (" override", file);
+ if (fcs & (1 << 24))
+ fputs_filtered (" zero", file);
+ if ((fcs & (0xb << 21)) == 0)
+ fputs_filtered (" no", file);
+ fputc_filtered ('\n', file);
+
+ fprintf_filtered (file, "nan2008 : %s\n", fcs & (1 << 18) ? "yes" : "no");
+ fprintf_filtered (file, "abs2008 : %s\n", fcs & (1 << 19) ? "yes" : "no");
+ fputc_filtered ('\n', file);
+
+ default_print_float_info (gdbarch, file, frame, args);
+}
+
/* Replacement for generic do_registers_info.
Print regs in pretty columns. */
{
struct gdbarch *gdbarch = get_frame_arch (frame);
/* Do values for GP (int) regs. */
- gdb_byte raw_buffer[MAX_REGISTER_SIZE];
+ const gdb_byte *raw_buffer;
+ struct value *value;
int ncols = (mips_abi_regsize (gdbarch) == 8 ? 4 : 8); /* display cols
per row. */
int col, byte;
/* For GP registers, we print a separate row of names above the vals. */
for (col = 0, regnum = start_regnum;
- col < ncols && regnum < gdbarch_num_regs (gdbarch)
- + gdbarch_num_pseudo_regs (gdbarch);
+ col < ncols && regnum < gdbarch_num_cooked_regs (gdbarch);
regnum++)
{
if (*gdbarch_register_name (gdbarch, regnum) == '\0')
/* Now print the values in hex, 4 or 8 to the row. */
for (col = 0, regnum = start_regnum;
- col < ncols && regnum < gdbarch_num_regs (gdbarch)
- + gdbarch_num_pseudo_regs (gdbarch);
+ col < ncols && regnum < gdbarch_num_cooked_regs (gdbarch);
regnum++)
{
if (*gdbarch_register_name (gdbarch, regnum) == '\0')
break; /* End row: large register. */
/* OK: get the data in raw format. */
- if (!frame_register_read (frame, regnum, raw_buffer))
- error (_("can't read register %d (%s)"),
- regnum, gdbarch_register_name (gdbarch, regnum));
+ value = get_frame_register_value (frame, regnum);
+ if (value_optimized_out (value)
+ || !value_entirely_available (value))
+ {
+ fprintf_filtered (file, "%*s ",
+ (int) mips_abi_regsize (gdbarch) * 2,
+ (mips_abi_regsize (gdbarch) == 4 ? "<unavl>"
+ : "<unavailable>"));
+ col++;
+ continue;
+ }
+ raw_buffer = value_contents_all (value);
/* pad small registers */
for (byte = 0;
byte < (mips_abi_regsize (gdbarch)
- register_size (gdbarch, regnum)); byte++)
- printf_filtered (" ");
+ fprintf_filtered (file, " ");
/* Now print the register value in hex, endian order. */
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
for (byte =
/* Do all (or most) registers. */
{
regnum = gdbarch_num_regs (gdbarch);
- while (regnum < gdbarch_num_regs (gdbarch)
- + gdbarch_num_pseudo_regs (gdbarch))
+ while (regnum < gdbarch_num_cooked_regs (gdbarch))
{
if (mips_float_register_p (gdbarch, regnum))
{
}
}
-/* Is this a branch with a delay slot? */
-
-static int
-is_delayed (unsigned long insn)
-{
- int i;
- for (i = 0; i < NUMOPCODES; ++i)
- if (mips_opcodes[i].pinfo != INSN_MACRO
- && (insn & mips_opcodes[i].mask) == mips_opcodes[i].match)
- break;
- return (i < NUMOPCODES
- && (mips_opcodes[i].pinfo & (INSN_UNCOND_BRANCH_DELAY
- | INSN_COND_BRANCH_DELAY
- | INSN_COND_BRANCH_LIKELY)));
-}
-
static int
mips_single_step_through_delay (struct gdbarch *gdbarch,
struct frame_info *frame)
{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR pc = get_frame_pc (frame);
- gdb_byte buf[MIPS_INSN32_SIZE];
-
- /* There is no branch delay slot on MIPS16. */
- if (mips_pc_is_mips16 (pc))
+ enum mips_isa isa;
+ ULONGEST insn;
+ int size;
+
+ if ((mips_pc_is_mips (pc)
+ && !mips32_insn_at_pc_has_delay_slot (gdbarch, pc))
+ || (mips_pc_is_micromips (gdbarch, pc)
+ && !micromips_insn_at_pc_has_delay_slot (gdbarch, pc, 0))
+ || (mips_pc_is_mips16 (gdbarch, pc)
+ && !mips16_insn_at_pc_has_delay_slot (gdbarch, pc, 0)))
return 0;
- if (!breakpoint_here_p (get_frame_address_space (frame), pc + 4))
- return 0;
+ isa = mips_pc_isa (gdbarch, pc);
+ /* _has_delay_slot above will have validated the read. */
+ insn = mips_fetch_instruction (gdbarch, isa, pc, NULL);
+ size = mips_insn_size (isa, insn);
- if (!safe_frame_unwind_memory (frame, pc, buf, sizeof buf))
- /* If error reading memory, guess that it is not a delayed
- branch. */
- return 0;
- return is_delayed (extract_unsigned_integer (buf, sizeof buf, byte_order));
+ const address_space *aspace = get_frame_address_space (frame);
+
+ return breakpoint_here_p (aspace, pc + size) != no_breakpoint_here;
}
/* To skip prologues, I use this predicate. Returns either PC itself
CORE_ADDR post_prologue_pc
= skip_prologue_using_sal (gdbarch, func_addr);
if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ return std::max (pc, post_prologue_pc);
}
/* Can't determine prologue from the symbol table, need to examine
if (limit_pc == 0)
limit_pc = pc + 100; /* Magic. */
- if (mips_pc_is_mips16 (pc))
+ if (mips_pc_is_mips16 (gdbarch, pc))
return mips16_scan_prologue (gdbarch, pc, limit_pc, NULL, NULL);
+ else if (mips_pc_is_micromips (gdbarch, pc))
+ return micromips_scan_prologue (gdbarch, pc, limit_pc, NULL, NULL);
else
return mips32_scan_prologue (gdbarch, pc, limit_pc, NULL, NULL);
}
-/* Check whether the PC is in a function epilogue (32-bit version).
- This is a helper function for mips_in_function_epilogue_p. */
+/* Implement the stack_frame_destroyed_p gdbarch method (32-bit version).
+ This is a helper function for mips_stack_frame_destroyed_p. */
+
static int
-mips32_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+mips32_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
CORE_ADDR func_addr = 0, func_end = 0;
unsigned long high_word;
unsigned long inst;
- inst = mips_fetch_instruction (gdbarch, pc);
+ inst = mips_fetch_instruction (gdbarch, ISA_MIPS, pc, NULL);
high_word = (inst >> 16) & 0xffff;
if (high_word != 0x27bd /* addiu $sp,$sp,offset */
return 0;
}
-/* Check whether the PC is in a function epilogue (16-bit version).
- This is a helper function for mips_in_function_epilogue_p. */
+/* Implement the stack_frame_destroyed_p gdbarch method (microMIPS version).
+ This is a helper function for mips_stack_frame_destroyed_p. */
+
+static int
+micromips_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ CORE_ADDR func_addr = 0;
+ CORE_ADDR func_end = 0;
+ CORE_ADDR addr;
+ ULONGEST insn;
+ long offset;
+ int dreg;
+ int sreg;
+ int loc;
+
+ if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ return 0;
+
+ /* The microMIPS epilogue is max. 12 bytes long. */
+ addr = func_end - 12;
+
+ if (addr < func_addr + 2)
+ addr = func_addr + 2;
+ if (pc < addr)
+ return 0;
+
+ for (; pc < func_end; pc += loc)
+ {
+ loc = 0;
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, NULL);
+ loc += MIPS_INSN16_SIZE;
+ switch (mips_insn_size (ISA_MICROMIPS, insn))
+ {
+ /* 32-bit instructions. */
+ case 2 * MIPS_INSN16_SIZE:
+ insn <<= 16;
+ insn |= mips_fetch_instruction (gdbarch,
+ ISA_MICROMIPS, pc + loc, NULL);
+ loc += MIPS_INSN16_SIZE;
+ switch (micromips_op (insn >> 16))
+ {
+ case 0xc: /* ADDIU: bits 001100 */
+ case 0x17: /* DADDIU: bits 010111 */
+ sreg = b0s5_reg (insn >> 16);
+ dreg = b5s5_reg (insn >> 16);
+ offset = (b0s16_imm (insn) ^ 0x8000) - 0x8000;
+ if (sreg == MIPS_SP_REGNUM && dreg == MIPS_SP_REGNUM
+ /* (D)ADDIU $sp, imm */
+ && offset >= 0)
+ break;
+ return 0;
+
+ default:
+ return 0;
+ }
+ break;
+
+ /* 16-bit instructions. */
+ case MIPS_INSN16_SIZE:
+ switch (micromips_op (insn))
+ {
+ case 0x3: /* MOVE: bits 000011 */
+ sreg = b0s5_reg (insn);
+ dreg = b5s5_reg (insn);
+ if (sreg == 0 && dreg == 0)
+ /* MOVE $zero, $zero aka NOP */
+ break;
+ return 0;
+
+ case 0x11: /* POOL16C: bits 010001 */
+ if (b5s5_op (insn) == 0x18
+ /* JRADDIUSP: bits 010011 11000 */
+ || (b5s5_op (insn) == 0xd
+ /* JRC: bits 010011 01101 */
+ && b0s5_reg (insn) == MIPS_RA_REGNUM))
+ /* JRC $ra */
+ break;
+ return 0;
+
+ case 0x13: /* POOL16D: bits 010011 */
+ offset = micromips_decode_imm9 (b1s9_imm (insn));
+ if ((insn & 0x1) == 0x1
+ /* ADDIUSP: bits 010011 1 */
+ && offset > 0)
+ break;
+ return 0;
+
+ default:
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+/* Implement the stack_frame_destroyed_p gdbarch method (16-bit version).
+ This is a helper function for mips_stack_frame_destroyed_p. */
+
static int
-mips16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+mips16_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
CORE_ADDR func_addr = 0, func_end = 0;
{
unsigned short inst;
- inst = mips_fetch_instruction (gdbarch, pc);
+ inst = mips_fetch_instruction (gdbarch, ISA_MIPS16, pc, NULL);
if ((inst & 0xf800) == 0xf000) /* extend */
continue;
return 0;
}
-/* The epilogue is defined here as the area at the end of a function,
+/* Implement the stack_frame_destroyed_p gdbarch method.
+
+ The epilogue is defined here as the area at the end of a function,
after an instruction which destroys the function's stack frame. */
+
static int
-mips_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+mips_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- if (mips_pc_is_mips16 (pc))
- return mips16_in_function_epilogue_p (gdbarch, pc);
+ if (mips_pc_is_mips16 (gdbarch, pc))
+ return mips16_stack_frame_destroyed_p (gdbarch, pc);
+ else if (mips_pc_is_micromips (gdbarch, pc))
+ return micromips_stack_frame_destroyed_p (gdbarch, pc);
else
- return mips32_in_function_epilogue_p (gdbarch, pc);
+ return mips32_stack_frame_destroyed_p (gdbarch, pc);
}
/* Root of all "set mips "/"show mips " commands. This will eventually be
used for all MIPS-specific commands. */
static void
-show_mips_command (char *args, int from_tty)
+show_mips_command (const char *args, int from_tty)
{
help_list (showmipscmdlist, "show mips ", all_commands, gdb_stdout);
}
static void
-set_mips_command (char *args, int from_tty)
+set_mips_command (const char *args, int from_tty)
{
printf_unfiltered
("\"set mips\" must be followed by an appropriate subcommand.\n");
/* Commands to show/set the MIPS FPU type. */
static void
-show_mipsfpu_command (char *args, int from_tty)
+show_mipsfpu_command (const char *args, int from_tty)
{
- char *fpu;
+ const char *fpu;
- if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_mips)
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_mips)
{
printf_unfiltered
("The MIPS floating-point coprocessor is unknown "
return;
}
- switch (MIPS_FPU_TYPE (target_gdbarch))
+ switch (MIPS_FPU_TYPE (target_gdbarch ()))
{
case MIPS_FPU_SINGLE:
fpu = "single-precision";
static void
-set_mipsfpu_command (char *args, int from_tty)
+set_mipsfpu_command (const char *args, int from_tty)
{
printf_unfiltered ("\"set mipsfpu\" must be followed by \"double\", "
"\"single\",\"none\" or \"auto\".\n");
}
static void
-set_mipsfpu_single_command (char *args, int from_tty)
+set_mipsfpu_single_command (const char *args, int from_tty)
{
struct gdbarch_info info;
gdbarch_info_init (&info);
}
static void
-set_mipsfpu_double_command (char *args, int from_tty)
+set_mipsfpu_double_command (const char *args, int from_tty)
{
struct gdbarch_info info;
gdbarch_info_init (&info);
}
static void
-set_mipsfpu_none_command (char *args, int from_tty)
+set_mipsfpu_none_command (const char *args, int from_tty)
{
struct gdbarch_info info;
gdbarch_info_init (&info);
handle the search for this specific architecture. */
if (!gdbarch_update_p (info))
internal_error (__FILE__, __LINE__, _("set mipsfpu failed"));
-}
-
-static void
-set_mipsfpu_auto_command (char *args, int from_tty)
-{
- mips_fpu_type_auto = 1;
-}
-
-/* Attempt to identify the particular processor model by reading the
- processor id. NOTE: cagney/2003-11-15: Firstly it isn't clear that
- the relevant processor still exists (it dates back to '94) and
- secondly this is not the way to do this. The processor type should
- be set by forcing an architecture change. */
-
-void
-deprecated_mips_set_processor_regs_hack (void)
-{
- struct regcache *regcache = get_current_regcache ();
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- ULONGEST prid;
+}
- regcache_cooked_read_unsigned (regcache, MIPS_PRID_REGNUM, &prid);
- if ((prid & ~0xf) == 0x700)
- tdep->mips_processor_reg_names = mips_r3041_reg_names;
+static void
+set_mipsfpu_auto_command (const char *args, int from_tty)
+{
+ mips_fpu_type_auto = 1;
}
/* Just like reinit_frame_cache, but with the right arguments to be
callable as an sfunc. */
static void
-reinit_frame_cache_sfunc (char *args, int from_tty,
+reinit_frame_cache_sfunc (const char *args, int from_tty,
struct cmd_list_element *c)
{
reinit_frame_cache ();
static int
gdb_print_insn_mips (bfd_vma memaddr, struct disassemble_info *info)
{
+ gdb_disassembler *di
+ = static_cast<gdb_disassembler *>(info->application_data);
+ struct gdbarch *gdbarch = di->arch ();
+
/* FIXME: cagney/2003-06-26: Is this even necessary? The
disassembler needs to be able to locally determine the ISA, and
not rely on GDB. Otherwize the stand-alone 'objdump -d' will not
work. */
- if (mips_pc_is_mips16 (memaddr))
+ if (mips_pc_is_mips16 (gdbarch, memaddr))
info->mach = bfd_mach_mips16;
+ else if (mips_pc_is_micromips (gdbarch, memaddr))
+ info->mach = bfd_mach_mips_micromips;
/* Round down the instruction address to the appropriate boundary. */
- memaddr &= (info->mach == bfd_mach_mips16 ? ~1 : ~3);
-
- /* Set the disassembler options. */
- if (!info->disassembler_options)
- /* This string is not recognized explicitly by the disassembler,
- but it tells the disassembler to not try to guess the ABI from
- the bfd elf headers, such that, if the user overrides the ABI
- of a program linked as NewABI, the disassembly will follow the
- register naming conventions specified by the user. */
- info->disassembler_options = "gpr-names=32";
-
- /* Call the appropriate disassembler based on the target endian-ness. */
- if (info->endian == BFD_ENDIAN_BIG)
- return print_insn_big_mips (memaddr, info);
- else
- return print_insn_little_mips (memaddr, info);
-}
-
-static int
-gdb_print_insn_mips_n32 (bfd_vma memaddr, struct disassemble_info *info)
-{
- /* Set up the disassembler info, so that we get the right
- register names from libopcodes. */
- info->disassembler_options = "gpr-names=n32";
- info->flavour = bfd_target_elf_flavour;
+ memaddr &= (info->mach == bfd_mach_mips16
+ || info->mach == bfd_mach_mips_micromips) ? ~1 : ~3;
- return gdb_print_insn_mips (memaddr, info);
+ return default_print_insn (memaddr, info);
}
+/* Implement the breakpoint_kind_from_pc gdbarch method. */
+
static int
-gdb_print_insn_mips_n64 (bfd_vma memaddr, struct disassemble_info *info)
+mips_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
{
- /* Set up the disassembler info, so that we get the right
- register names from libopcodes. */
- info->disassembler_options = "gpr-names=64";
- info->flavour = bfd_target_elf_flavour;
+ CORE_ADDR pc = *pcptr;
+
+ if (mips_pc_is_mips16 (gdbarch, pc))
+ {
+ *pcptr = unmake_compact_addr (pc);
+ return MIPS_BP_KIND_MIPS16;
+ }
+ else if (mips_pc_is_micromips (gdbarch, pc))
+ {
+ ULONGEST insn;
+ int status;
- return gdb_print_insn_mips (memaddr, info);
+ *pcptr = unmake_compact_addr (pc);
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, pc, &status);
+ if (status || (mips_insn_size (ISA_MICROMIPS, insn) == 2))
+ return MIPS_BP_KIND_MICROMIPS16;
+ else
+ return MIPS_BP_KIND_MICROMIPS32;
+ }
+ else
+ return MIPS_BP_KIND_MIPS32;
}
-/* This function implements gdbarch_breakpoint_from_pc. It uses the
- program counter value to determine whether a 16- 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 pc (if necessary) to point to the actual memory location where
- the breakpoint should be inserted. */
+/* Implement the sw_breakpoint_from_kind gdbarch method. */
static const gdb_byte *
-mips_breakpoint_from_pc (struct gdbarch *gdbarch,
- CORE_ADDR *pcptr, int *lenptr)
+mips_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
{
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
+ enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
+
+ switch (kind)
{
- if (mips_pc_is_mips16 (*pcptr))
- {
- static gdb_byte mips16_big_breakpoint[] = { 0xe8, 0xa5 };
- *pcptr = unmake_mips16_addr (*pcptr);
- *lenptr = sizeof (mips16_big_breakpoint);
+ case MIPS_BP_KIND_MIPS16:
+ {
+ static gdb_byte mips16_big_breakpoint[] = { 0xe8, 0xa5 };
+ static gdb_byte mips16_little_breakpoint[] = { 0xa5, 0xe8 };
+
+ *size = 2;
+ if (byte_order_for_code == BFD_ENDIAN_BIG)
return mips16_big_breakpoint;
- }
- else
- {
- /* The IDT board uses an unusual breakpoint value, and
- sometimes gets confused when it sees the usual MIPS
- breakpoint instruction. */
- static gdb_byte big_breakpoint[] = { 0, 0x5, 0, 0xd };
- static gdb_byte pmon_big_breakpoint[] = { 0, 0, 0, 0xd };
- static gdb_byte idt_big_breakpoint[] = { 0, 0, 0x0a, 0xd };
- /* Likewise, IRIX appears to expect a different breakpoint,
- although this is not apparent until you try to use pthreads. */
- static gdb_byte irix_big_breakpoint[] = { 0, 0, 0, 0xd };
-
- *lenptr = sizeof (big_breakpoint);
-
- if (strcmp (target_shortname, "mips") == 0)
- return idt_big_breakpoint;
- else if (strcmp (target_shortname, "ddb") == 0
- || strcmp (target_shortname, "pmon") == 0
- || strcmp (target_shortname, "lsi") == 0)
- return pmon_big_breakpoint;
- else if (gdbarch_osabi (gdbarch) == GDB_OSABI_IRIX)
- return irix_big_breakpoint;
- else
- return big_breakpoint;
- }
- }
- else
- {
- if (mips_pc_is_mips16 (*pcptr))
- {
- static gdb_byte mips16_little_breakpoint[] = { 0xa5, 0xe8 };
- *pcptr = unmake_mips16_addr (*pcptr);
- *lenptr = sizeof (mips16_little_breakpoint);
+ else
return mips16_little_breakpoint;
- }
- else
- {
- static gdb_byte little_breakpoint[] = { 0xd, 0, 0x5, 0 };
- static gdb_byte pmon_little_breakpoint[] = { 0xd, 0, 0, 0 };
- static gdb_byte idt_little_breakpoint[] = { 0xd, 0x0a, 0, 0 };
-
- *lenptr = sizeof (little_breakpoint);
-
- if (strcmp (target_shortname, "mips") == 0)
- return idt_little_breakpoint;
- else if (strcmp (target_shortname, "ddb") == 0
- || strcmp (target_shortname, "pmon") == 0
- || strcmp (target_shortname, "lsi") == 0)
- return pmon_little_breakpoint;
- else
- return little_breakpoint;
- }
- }
+ }
+ case MIPS_BP_KIND_MICROMIPS16:
+ {
+ static gdb_byte micromips16_big_breakpoint[] = { 0x46, 0x85 };
+ static gdb_byte micromips16_little_breakpoint[] = { 0x85, 0x46 };
+
+ *size = 2;
+
+ if (byte_order_for_code == BFD_ENDIAN_BIG)
+ return micromips16_big_breakpoint;
+ else
+ return micromips16_little_breakpoint;
+ }
+ case MIPS_BP_KIND_MICROMIPS32:
+ {
+ static gdb_byte micromips32_big_breakpoint[] = { 0, 0x5, 0, 0x7 };
+ static gdb_byte micromips32_little_breakpoint[] = { 0x5, 0, 0x7, 0 };
+
+ *size = 4;
+ if (byte_order_for_code == BFD_ENDIAN_BIG)
+ return micromips32_big_breakpoint;
+ else
+ return micromips32_little_breakpoint;
+ }
+ case MIPS_BP_KIND_MIPS32:
+ {
+ static gdb_byte big_breakpoint[] = { 0, 0x5, 0, 0xd };
+ static gdb_byte little_breakpoint[] = { 0xd, 0, 0x5, 0 };
+
+ *size = 4;
+ if (byte_order_for_code == BFD_ENDIAN_BIG)
+ return big_breakpoint;
+ else
+ return little_breakpoint;
+ }
+ default:
+ gdb_assert_not_reached ("unexpected mips breakpoint kind");
+ };
}
-/* Return non-zero if the ADDR instruction has a branch delay slot
- (i.e. it is a jump or branch instruction). This function is based
- on mips32_next_pc. */
+/* Return non-zero if the standard MIPS instruction INST has a branch
+ delay slot (i.e. it is a jump or branch instruction). This function
+ is based on mips32_next_pc. */
static int
-mips32_instruction_has_delay_slot (struct gdbarch *gdbarch, CORE_ADDR addr)
+mips32_instruction_has_delay_slot (struct gdbarch *gdbarch, ULONGEST inst)
{
- gdb_byte buf[MIPS_INSN32_SIZE];
- unsigned long inst;
- int status;
int op;
int rs;
int rt;
- status = target_read_memory (addr, buf, MIPS_INSN32_SIZE);
- if (status)
- return 0;
-
- inst = mips_fetch_instruction (gdbarch, addr);
op = itype_op (inst);
if ((inst & 0xe0000000) != 0)
{
rs = itype_rs (inst);
rt = itype_rt (inst);
- return (op >> 2 == 5 /* BEQL, BNEL, BLEZL, BGTZL: bits 0101xx */
+ return (is_octeon_bbit_op (op, gdbarch)
+ || op >> 2 == 5 /* BEQL, BNEL, BLEZL, BGTZL: bits 0101xx */
|| op == 29 /* JALX: bits 011101 */
|| (op == 17
&& (rs == 8
}
}
-/* Return non-zero if the ADDR instruction, which must be a 32-bit
- instruction if MUSTBE32 is set or can be any instruction otherwise,
- has a branch delay slot (i.e. it is a non-compact jump instruction). */
+/* Return non-zero if a standard MIPS instruction at ADDR has a branch
+ delay slot (i.e. it is a jump or branch instruction). */
+
+static int
+mips32_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+ ULONGEST insn;
+ int status;
+
+ insn = mips_fetch_instruction (gdbarch, ISA_MIPS, addr, &status);
+ if (status)
+ return 0;
+
+ return mips32_instruction_has_delay_slot (gdbarch, insn);
+}
+
+/* Return non-zero if the microMIPS instruction INSN, comprising the
+ 16-bit major opcode word in the high 16 bits and any second word
+ in the low 16 bits, has a branch delay slot (i.e. it is a non-compact
+ jump or branch instruction). The instruction must be 32-bit if
+ MUSTBE32 is set or can be any instruction otherwise. */
+
+static int
+micromips_instruction_has_delay_slot (ULONGEST insn, int mustbe32)
+{
+ ULONGEST major = insn >> 16;
+
+ switch (micromips_op (major))
+ {
+ /* 16-bit instructions. */
+ case 0x33: /* B16: bits 110011 */
+ case 0x2b: /* BNEZ16: bits 101011 */
+ case 0x23: /* BEQZ16: bits 100011 */
+ return !mustbe32;
+ case 0x11: /* POOL16C: bits 010001 */
+ return (!mustbe32
+ && ((b5s5_op (major) == 0xc
+ /* JR16: bits 010001 01100 */
+ || (b5s5_op (major) & 0x1e) == 0xe)));
+ /* JALR16, JALRS16: bits 010001 0111x */
+ /* 32-bit instructions. */
+ case 0x3d: /* JAL: bits 111101 */
+ case 0x3c: /* JALX: bits 111100 */
+ case 0x35: /* J: bits 110101 */
+ case 0x2d: /* BNE: bits 101101 */
+ case 0x25: /* BEQ: bits 100101 */
+ case 0x1d: /* JALS: bits 011101 */
+ return 1;
+ case 0x10: /* POOL32I: bits 010000 */
+ return ((b5s5_op (major) & 0x1c) == 0x0
+ /* BLTZ, BLTZAL, BGEZ, BGEZAL: 010000 000xx */
+ || (b5s5_op (major) & 0x1d) == 0x4
+ /* BLEZ, BGTZ: bits 010000 001x0 */
+ || (b5s5_op (major) & 0x1d) == 0x11
+ /* BLTZALS, BGEZALS: bits 010000 100x1 */
+ || ((b5s5_op (major) & 0x1e) == 0x14
+ && (major & 0x3) == 0x0)
+ /* BC2F, BC2T: bits 010000 1010x xxx00 */
+ || (b5s5_op (major) & 0x1e) == 0x1a
+ /* BPOSGE64, BPOSGE32: bits 010000 1101x */
+ || ((b5s5_op (major) & 0x1e) == 0x1c
+ && (major & 0x3) == 0x0)
+ /* BC1F, BC1T: bits 010000 1110x xxx00 */
+ || ((b5s5_op (major) & 0x1c) == 0x1c
+ && (major & 0x3) == 0x1));
+ /* BC1ANY*: bits 010000 111xx xxx01 */
+ case 0x0: /* POOL32A: bits 000000 */
+ return (b0s6_op (insn) == 0x3c
+ /* POOL32Axf: bits 000000 ... 111100 */
+ && (b6s10_ext (insn) & 0x2bf) == 0x3c);
+ /* JALR, JALR.HB: 000000 000x111100 111100 */
+ /* JALRS, JALRS.HB: 000000 010x111100 111100 */
+ default:
+ return 0;
+ }
+}
+
+/* Return non-zero if a microMIPS instruction at ADDR has a branch delay
+ slot (i.e. it is a non-compact jump instruction). The instruction
+ must be 32-bit if MUSTBE32 is set or can be any instruction otherwise. */
static int
-mips16_instruction_has_delay_slot (struct gdbarch *gdbarch, CORE_ADDR addr,
- int mustbe32)
+micromips_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch,
+ CORE_ADDR addr, int mustbe32)
{
- gdb_byte buf[MIPS_INSN16_SIZE];
- unsigned short inst;
+ ULONGEST insn;
int status;
+ int size;
- status = target_read_memory (addr, buf, MIPS_INSN16_SIZE);
+ insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, addr, &status);
if (status)
return 0;
+ size = mips_insn_size (ISA_MICROMIPS, insn);
+ insn <<= 16;
+ if (size == 2 * MIPS_INSN16_SIZE)
+ {
+ insn |= mips_fetch_instruction (gdbarch, ISA_MICROMIPS, addr, &status);
+ if (status)
+ return 0;
+ }
+
+ return micromips_instruction_has_delay_slot (insn, mustbe32);
+}
+
+/* Return non-zero if the MIPS16 instruction INST, which must be
+ a 32-bit instruction if MUSTBE32 is set or can be any instruction
+ otherwise, has a branch delay slot (i.e. it is a non-compact jump
+ instruction). This function is based on mips16_next_pc. */
- inst = mips_fetch_instruction (gdbarch, addr);
- if (!mustbe32)
- return (inst & 0xf89f) == 0xe800; /* JR/JALR (16-bit instruction) */
+static int
+mips16_instruction_has_delay_slot (unsigned short inst, int mustbe32)
+{
+ if ((inst & 0xf89f) == 0xe800) /* JR/JALR (16-bit instruction) */
+ return !mustbe32;
return (inst & 0xf800) == 0x1800; /* JAL/JALX (32-bit instruction) */
}
+/* Return non-zero if a MIPS16 instruction at ADDR has a branch delay
+ slot (i.e. it is a non-compact jump instruction). The instruction
+ must be 32-bit if MUSTBE32 is set or can be any instruction otherwise. */
+
+static int
+mips16_insn_at_pc_has_delay_slot (struct gdbarch *gdbarch,
+ CORE_ADDR addr, int mustbe32)
+{
+ unsigned short insn;
+ int status;
+
+ insn = mips_fetch_instruction (gdbarch, ISA_MIPS16, addr, &status);
+ if (status)
+ return 0;
+
+ return mips16_instruction_has_delay_slot (insn, mustbe32);
+}
+
/* Calculate the starting address of the MIPS memory segment BPADDR is in.
This assumes KSSEG exists. */
&& func_addr > boundary && func_addr <= bpaddr)
boundary = func_addr;
- if (!mips_pc_is_mips16 (bpaddr))
+ if (mips_pc_is_mips (bpaddr))
{
if (bpaddr == boundary)
return bpaddr;
/* If the previous instruction has a branch delay slot, we have
to move the breakpoint to the branch instruction. */
prev_addr = bpaddr - 4;
- if (mips32_instruction_has_delay_slot (gdbarch, prev_addr))
+ if (mips32_insn_at_pc_has_delay_slot (gdbarch, prev_addr))
bpaddr = prev_addr;
}
else
{
+ int (*insn_at_pc_has_delay_slot) (struct gdbarch *, CORE_ADDR, int);
CORE_ADDR addr, jmpaddr;
int i;
- boundary = unmake_mips16_addr (boundary);
+ boundary = unmake_compact_addr (boundary);
/* The only MIPS16 instructions with delay slots are JAL, JALX,
JALR and JR. An absolute JAL/JALX is always 4 bytes long,
so try for that first, then try the 2 byte JALR/JR.
+ The microMIPS ASE has a whole range of jumps and branches
+ with delay slots, some of which take 4 bytes and some take
+ 2 bytes, so the idea is the same.
FIXME: We have to assume that bpaddr is not the second half
of an extended instruction. */
+ insn_at_pc_has_delay_slot = (mips_pc_is_micromips (gdbarch, bpaddr)
+ ? micromips_insn_at_pc_has_delay_slot
+ : mips16_insn_at_pc_has_delay_slot);
jmpaddr = 0;
addr = bpaddr;
for (i = 1; i < 4; i++)
{
- if (unmake_mips16_addr (addr) == boundary)
+ if (unmake_compact_addr (addr) == boundary)
break;
- addr -= 2;
- if (i == 1 && mips16_instruction_has_delay_slot (gdbarch, addr, 0))
+ addr -= MIPS_INSN16_SIZE;
+ if (i == 1 && insn_at_pc_has_delay_slot (gdbarch, addr, 0))
/* Looks like a JR/JALR at [target-1], but it could be
the second word of a previous JAL/JALX, so record it
and check back one more. */
jmpaddr = addr;
- else if (i > 1
- && mips16_instruction_has_delay_slot (gdbarch, addr, 1))
+ else if (i > 1 && insn_at_pc_has_delay_slot (gdbarch, addr, 1))
{
if (i == 2)
/* Looks like a JAL/JALX at [target-2], but it could also
status == 0 && target_pc == 0 && i < 20;
i++, pc += MIPS_INSN32_SIZE)
{
- ULONGEST inst = mips_fetch_instruction (gdbarch, pc);
+ ULONGEST inst = mips_fetch_instruction (gdbarch, ISA_MIPS, pc, NULL);
CORE_ADDR imm;
int rt;
int rs;
/* If the PC is in __call_stub_* or __fn_stub*, this is one of the
compiler-generated call or call/return stubs. */
- if (strncmp (name, mips_str_fn_stub, strlen (mips_str_fn_stub)) == 0
- || strncmp (name, mips_str_call_stub, strlen (mips_str_call_stub)) == 0)
+ if (startswith (name, mips_str_fn_stub)
+ || startswith (name, mips_str_call_stub))
{
if (pc == start_addr)
/* This is the 'call' part of a call stub. Call this helper
{
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
int i;
gdb_byte stub_code[16];
int32_t stub_words[4];
instructions inserted before foo or a three instruction sequence
which jumps to foo. */
msym = lookup_minimal_symbol_by_pc (pc);
- if (msym == NULL
- || SYMBOL_VALUE_ADDRESS (msym) != pc
- || SYMBOL_LINKAGE_NAME (msym) == NULL
- || strncmp (SYMBOL_LINKAGE_NAME (msym), ".pic.", 5) != 0)
+ if (msym.minsym == NULL
+ || BMSYMBOL_VALUE_ADDRESS (msym) != pc
+ || msym.minsym->linkage_name () == NULL
+ || !startswith (msym.minsym->linkage_name (), ".pic."))
return 0;
/* A two-instruction header. */
- if (MSYMBOL_SIZE (msym) == 8)
+ if (MSYMBOL_SIZE (msym.minsym) == 8)
return pc + 8;
/* A three-instruction (plus delay slot) trampoline. */
- if (MSYMBOL_SIZE (msym) == 16)
+ if (MSYMBOL_SIZE (msym.minsym) == 16)
{
if (target_read_memory (pc, stub_code, 16) != 0)
return 0;
new_pc = mips_skip_mips16_trampoline_code (frame, pc);
if (new_pc)
- {
- pc = new_pc;
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
- }
+ pc = new_pc;
new_pc = find_solib_trampoline_target (frame, pc);
if (new_pc)
- {
- pc = new_pc;
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
- }
+ pc = new_pc;
new_pc = mips_skip_pic_trampoline_code (frame, pc);
if (new_pc)
- {
- pc = new_pc;
- if (is_mips16_addr (pc))
- pc = unmake_mips16_addr (pc);
- }
+ pc = new_pc;
}
while (pc != target_pc);
else if (mips_regnum (gdbarch)->dspacc != -1 && num >= 72 && num < 78)
regnum = num + mips_regnum (gdbarch)->dspacc - 72;
else
- /* This will hopefully (eventually) provoke a warning. Should
- we be calling complaint() here? */
- return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
+ return -1;
return gdbarch_num_regs (gdbarch) + regnum;
}
else if (mips_regnum (gdbarch)->dspacc != -1 && num >= 66 && num < 72)
regnum = num + mips_regnum (gdbarch)->dspacc - 66;
else
- /* This will hopefully (eventually) provoke a warning. Should we
- be calling complaint() here? */
- return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
+ return -1;
return gdbarch_num_regs (gdbarch) + regnum;
}
mips_find_abi_section (bfd *abfd, asection *sect, void *obj)
{
enum mips_abi *abip = (enum mips_abi *) obj;
- const char *name = bfd_get_section_name (abfd, sect);
+ const char *name = bfd_section_name (sect);
if (*abip != MIPS_ABI_UNKNOWN)
return;
- if (strncmp (name, ".mdebug.", 8) != 0)
+ if (!startswith (name, ".mdebug."))
return;
if (strcmp (name, ".mdebug.abi32") == 0)
mips_find_long_section (bfd *abfd, asection *sect, void *obj)
{
int *lbp = (int *) obj;
- const char *name = bfd_get_section_name (abfd, sect);
+ const char *name = bfd_section_name (sect);
- if (strncmp (name, ".gcc_compiled_long32", 20) == 0)
+ if (startswith (name, ".gcc_compiled_long32"))
*lbp = 32;
- else if (strncmp (name, ".gcc_compiled_long64", 20) == 0)
+ else if (startswith (name, ".gcc_compiled_long64"))
*lbp = 64;
- else if (strncmp (name, ".gcc_compiled_long", 18) == 0)
+ else if (startswith (name, ".gcc_compiled_long"))
warning (_("unrecognized .gcc_compiled_longXX"));
}
internal_error (__FILE__, __LINE__, _("unknown ABI string"));
}
+/* Return the default compressed instruction set, either of MIPS16
+ or microMIPS, selected when none could have been determined from
+ the ELF header of the binary being executed (or no binary has been
+ selected. */
+
+static enum mips_isa
+global_mips_compression (void)
+{
+ int i;
+
+ for (i = 0; mips_compression_strings[i] != NULL; i++)
+ if (mips_compression_strings[i] == mips_compression_string)
+ return (enum mips_isa) i;
+
+ internal_error (__FILE__, __LINE__, _("unknown compressed ISA string"));
+}
+
static void
mips_register_g_packet_guesses (struct gdbarch *gdbarch)
{
/* Otherwise we don't have a useful guess. */
}
-static struct value *
-value_of_mips_user_reg (struct frame_info *frame, const void *baton)
-{
- const int *reg_p = baton;
- return value_of_register (*reg_p, frame);
-}
+static struct value *
+value_of_mips_user_reg (struct frame_info *frame, const void *baton)
+{
+ const int *reg_p = (const int *) baton;
+ return value_of_register (*reg_p, frame);
+}
+
+static struct gdbarch *
+mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep;
+ int elf_flags;
+ enum mips_abi mips_abi, found_abi, wanted_abi;
+ int i, num_regs;
+ enum mips_fpu_type fpu_type;
+ struct tdesc_arch_data *tdesc_data = NULL;
+ int elf_fpu_type = Val_GNU_MIPS_ABI_FP_ANY;
+ const char **reg_names;
+ struct mips_regnum mips_regnum, *regnum;
+ enum mips_isa mips_isa;
+ int dspacc;
+ int dspctl;
+
+ /* First of all, extract the elf_flags, if available. */
+ if (info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
+ elf_flags = elf_elfheader (info.abfd)->e_flags;
+ else if (arches != NULL)
+ elf_flags = gdbarch_tdep (arches->gdbarch)->elf_flags;
+ else
+ elf_flags = 0;
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "mips_gdbarch_init: elf_flags = 0x%08x\n", elf_flags);
+
+ /* Check ELF_FLAGS to see if it specifies the ABI being used. */
+ switch ((elf_flags & EF_MIPS_ABI))
+ {
+ case E_MIPS_ABI_O32:
+ found_abi = MIPS_ABI_O32;
+ break;
+ case E_MIPS_ABI_O64:
+ found_abi = MIPS_ABI_O64;
+ break;
+ case E_MIPS_ABI_EABI32:
+ found_abi = MIPS_ABI_EABI32;
+ break;
+ case E_MIPS_ABI_EABI64:
+ found_abi = MIPS_ABI_EABI64;
+ break;
+ default:
+ if ((elf_flags & EF_MIPS_ABI2))
+ found_abi = MIPS_ABI_N32;
+ else
+ found_abi = MIPS_ABI_UNKNOWN;
+ break;
+ }
+
+ /* GCC creates a pseudo-section whose name describes the ABI. */
+ if (found_abi == MIPS_ABI_UNKNOWN && info.abfd != NULL)
+ bfd_map_over_sections (info.abfd, mips_find_abi_section, &found_abi);
+
+ /* If we have no useful BFD information, use the ABI from the last
+ MIPS architecture (if there is one). */
+ if (found_abi == MIPS_ABI_UNKNOWN && info.abfd == NULL && arches != NULL)
+ found_abi = gdbarch_tdep (arches->gdbarch)->found_abi;
+
+ /* Try the architecture for any hint of the correct ABI. */
+ if (found_abi == MIPS_ABI_UNKNOWN
+ && info.bfd_arch_info != NULL
+ && info.bfd_arch_info->arch == bfd_arch_mips)
+ {
+ switch (info.bfd_arch_info->mach)
+ {
+ case bfd_mach_mips3900:
+ found_abi = MIPS_ABI_EABI32;
+ break;
+ case bfd_mach_mips4100:
+ case bfd_mach_mips5000:
+ found_abi = MIPS_ABI_EABI64;
+ break;
+ case bfd_mach_mips8000:
+ case bfd_mach_mips10000:
+ /* On Irix, ELF64 executables use the N64 ABI. The
+ pseudo-sections which describe the ABI aren't present
+ on IRIX. (Even for executables created by gcc.) */
+ if (info.abfd != NULL
+ && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
+ && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
+ found_abi = MIPS_ABI_N64;
+ else
+ found_abi = MIPS_ABI_N32;
+ break;
+ }
+ }
+
+ /* Default 64-bit objects to N64 instead of O32. */
+ if (found_abi == MIPS_ABI_UNKNOWN
+ && info.abfd != NULL
+ && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
+ && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
+ found_abi = MIPS_ABI_N64;
+
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: found_abi = %d\n",
+ found_abi);
+
+ /* What has the user specified from the command line? */
+ wanted_abi = global_mips_abi ();
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: wanted_abi = %d\n",
+ wanted_abi);
+
+ /* Now that we have found what the ABI for this binary would be,
+ check whether the user is overriding it. */
+ if (wanted_abi != MIPS_ABI_UNKNOWN)
+ mips_abi = wanted_abi;
+ else if (found_abi != MIPS_ABI_UNKNOWN)
+ mips_abi = found_abi;
+ else
+ mips_abi = MIPS_ABI_O32;
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: mips_abi = %d\n",
+ mips_abi);
+
+ /* Make sure we don't use a 32-bit architecture with a 64-bit ABI. */
+ if (mips_abi != MIPS_ABI_EABI32
+ && mips_abi != MIPS_ABI_O32
+ && info.bfd_arch_info != NULL
+ && info.bfd_arch_info->arch == bfd_arch_mips
+ && info.bfd_arch_info->bits_per_word < 64)
+ info.bfd_arch_info = bfd_lookup_arch (bfd_arch_mips, bfd_mach_mips4000);
+
+ /* Determine the default compressed ISA. */
+ if ((elf_flags & EF_MIPS_ARCH_ASE_MICROMIPS) != 0
+ && (elf_flags & EF_MIPS_ARCH_ASE_M16) == 0)
+ mips_isa = ISA_MICROMIPS;
+ else if ((elf_flags & EF_MIPS_ARCH_ASE_M16) != 0
+ && (elf_flags & EF_MIPS_ARCH_ASE_MICROMIPS) == 0)
+ mips_isa = ISA_MIPS16;
+ else
+ mips_isa = global_mips_compression ();
+ mips_compression_string = mips_compression_strings[mips_isa];
+
+ /* Also used when doing an architecture lookup. */
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "mips_gdbarch_init: "
+ "mips64_transfers_32bit_regs_p = %d\n",
+ mips64_transfers_32bit_regs_p);
+
+ /* Determine the MIPS FPU type. */
+#ifdef HAVE_ELF
+ if (info.abfd
+ && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
+ elf_fpu_type = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU,
+ Tag_GNU_MIPS_ABI_FP);
+#endif /* HAVE_ELF */
+
+ if (!mips_fpu_type_auto)
+ fpu_type = mips_fpu_type;
+ else if (elf_fpu_type != Val_GNU_MIPS_ABI_FP_ANY)
+ {
+ switch (elf_fpu_type)
+ {
+ case Val_GNU_MIPS_ABI_FP_DOUBLE:
+ fpu_type = MIPS_FPU_DOUBLE;
+ break;
+ case Val_GNU_MIPS_ABI_FP_SINGLE:
+ fpu_type = MIPS_FPU_SINGLE;
+ break;
+ case Val_GNU_MIPS_ABI_FP_SOFT:
+ default:
+ /* Soft float or unknown. */
+ fpu_type = MIPS_FPU_NONE;
+ break;
+ }
+ }
+ else if (info.bfd_arch_info != NULL
+ && info.bfd_arch_info->arch == bfd_arch_mips)
+ switch (info.bfd_arch_info->mach)
+ {
+ case bfd_mach_mips3900:
+ case bfd_mach_mips4100:
+ case bfd_mach_mips4111:
+ case bfd_mach_mips4120:
+ fpu_type = MIPS_FPU_NONE;
+ break;
+ case bfd_mach_mips4650:
+ fpu_type = MIPS_FPU_SINGLE;
+ break;
+ default:
+ fpu_type = MIPS_FPU_DOUBLE;
+ break;
+ }
+ else if (arches != NULL)
+ fpu_type = MIPS_FPU_TYPE (arches->gdbarch);
+ else
+ fpu_type = MIPS_FPU_DOUBLE;
+ if (gdbarch_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "mips_gdbarch_init: fpu_type = %d\n", fpu_type);
+
+ /* Check for blatant incompatibilities. */
-static struct gdbarch *
-mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
-{
- struct gdbarch *gdbarch;
- struct gdbarch_tdep *tdep;
- int elf_flags;
- enum mips_abi mips_abi, found_abi, wanted_abi;
- int i, num_regs;
- enum mips_fpu_type fpu_type;
- struct tdesc_arch_data *tdesc_data = NULL;
- int elf_fpu_type = 0;
- const char **reg_names;
- struct mips_regnum mips_regnum, *regnum;
- int dspacc;
- int dspctl;
+ /* If we have only 32-bit registers, then we can't debug a 64-bit
+ ABI. */
+ if (info.target_desc
+ && tdesc_property (info.target_desc, PROPERTY_GP32) != NULL
+ && mips_abi != MIPS_ABI_EABI32
+ && mips_abi != MIPS_ABI_O32)
+ return NULL;
/* Fill in the OS dependent register numbers and names. */
- if (info.osabi == GDB_OSABI_IRIX)
- {
- mips_regnum.fp0 = 32;
- mips_regnum.pc = 64;
- mips_regnum.cause = 65;
- mips_regnum.badvaddr = 66;
- mips_regnum.hi = 67;
- mips_regnum.lo = 68;
- mips_regnum.fp_control_status = 69;
- mips_regnum.fp_implementation_revision = 70;
- mips_regnum.dspacc = dspacc = -1;
- mips_regnum.dspctl = dspctl = -1;
- num_regs = 71;
- reg_names = mips_irix_reg_names;
- }
- else if (info.osabi == GDB_OSABI_LINUX)
+ if (info.osabi == GDB_OSABI_LINUX)
{
mips_regnum.fp0 = 38;
mips_regnum.pc = 37;
mips_regnum.dspctl = -1;
dspacc = 72;
dspctl = 78;
- num_regs = 79;
+ num_regs = 90;
reg_names = mips_linux_reg_names;
}
else
return NULL;
}
+ num_regs = mips_regnum.fp_implementation_revision + 1;
+
if (dspacc >= 0)
{
feature = tdesc_find_feature (info.target_desc,
mips_regnum.dspacc = dspacc;
mips_regnum.dspctl = dspctl;
+
+ num_regs = mips_regnum.dspctl + 1;
}
}
reg_names = NULL;
}
- /* First of all, extract the elf_flags, if available. */
- if (info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
- elf_flags = elf_elfheader (info.abfd)->e_flags;
- else if (arches != NULL)
- elf_flags = gdbarch_tdep (arches->gdbarch)->elf_flags;
- else
- elf_flags = 0;
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog,
- "mips_gdbarch_init: elf_flags = 0x%08x\n", elf_flags);
-
- /* Check ELF_FLAGS to see if it specifies the ABI being used. */
- switch ((elf_flags & EF_MIPS_ABI))
- {
- case E_MIPS_ABI_O32:
- found_abi = MIPS_ABI_O32;
- break;
- case E_MIPS_ABI_O64:
- found_abi = MIPS_ABI_O64;
- break;
- case E_MIPS_ABI_EABI32:
- found_abi = MIPS_ABI_EABI32;
- break;
- case E_MIPS_ABI_EABI64:
- found_abi = MIPS_ABI_EABI64;
- break;
- default:
- if ((elf_flags & EF_MIPS_ABI2))
- found_abi = MIPS_ABI_N32;
- else
- found_abi = MIPS_ABI_UNKNOWN;
- break;
- }
-
- /* GCC creates a pseudo-section whose name describes the ABI. */
- if (found_abi == MIPS_ABI_UNKNOWN && info.abfd != NULL)
- bfd_map_over_sections (info.abfd, mips_find_abi_section, &found_abi);
-
- /* If we have no useful BFD information, use the ABI from the last
- MIPS architecture (if there is one). */
- if (found_abi == MIPS_ABI_UNKNOWN && info.abfd == NULL && arches != NULL)
- found_abi = gdbarch_tdep (arches->gdbarch)->found_abi;
-
- /* Try the architecture for any hint of the correct ABI. */
- if (found_abi == MIPS_ABI_UNKNOWN
- && info.bfd_arch_info != NULL
- && info.bfd_arch_info->arch == bfd_arch_mips)
- {
- switch (info.bfd_arch_info->mach)
- {
- case bfd_mach_mips3900:
- found_abi = MIPS_ABI_EABI32;
- break;
- case bfd_mach_mips4100:
- case bfd_mach_mips5000:
- found_abi = MIPS_ABI_EABI64;
- break;
- case bfd_mach_mips8000:
- case bfd_mach_mips10000:
- /* On Irix, ELF64 executables use the N64 ABI. The
- pseudo-sections which describe the ABI aren't present
- on IRIX. (Even for executables created by gcc.) */
- if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
- && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
- found_abi = MIPS_ABI_N64;
- else
- found_abi = MIPS_ABI_N32;
- break;
- }
- }
-
- /* Default 64-bit objects to N64 instead of O32. */
- if (found_abi == MIPS_ABI_UNKNOWN
- && info.abfd != NULL
- && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
- && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
- found_abi = MIPS_ABI_N64;
-
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: found_abi = %d\n",
- found_abi);
-
- /* What has the user specified from the command line? */
- wanted_abi = global_mips_abi ();
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: wanted_abi = %d\n",
- wanted_abi);
-
- /* Now that we have found what the ABI for this binary would be,
- check whether the user is overriding it. */
- if (wanted_abi != MIPS_ABI_UNKNOWN)
- mips_abi = wanted_abi;
- else if (found_abi != MIPS_ABI_UNKNOWN)
- mips_abi = found_abi;
- else
- mips_abi = MIPS_ABI_O32;
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: mips_abi = %d\n",
- mips_abi);
-
- /* Also used when doing an architecture lookup. */
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog,
- "mips_gdbarch_init: "
- "mips64_transfers_32bit_regs_p = %d\n",
- mips64_transfers_32bit_regs_p);
-
- /* Determine the MIPS FPU type. */
-#ifdef HAVE_ELF
- if (info.abfd
- && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
- elf_fpu_type = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU,
- Tag_GNU_MIPS_ABI_FP);
-#endif /* HAVE_ELF */
-
- if (!mips_fpu_type_auto)
- fpu_type = mips_fpu_type;
- else if (elf_fpu_type != 0)
- {
- switch (elf_fpu_type)
- {
- case 1:
- fpu_type = MIPS_FPU_DOUBLE;
- break;
- case 2:
- fpu_type = MIPS_FPU_SINGLE;
- break;
- case 3:
- default:
- /* Soft float or unknown. */
- fpu_type = MIPS_FPU_NONE;
- break;
- }
- }
- else if (info.bfd_arch_info != NULL
- && info.bfd_arch_info->arch == bfd_arch_mips)
- switch (info.bfd_arch_info->mach)
- {
- case bfd_mach_mips3900:
- case bfd_mach_mips4100:
- case bfd_mach_mips4111:
- case bfd_mach_mips4120:
- fpu_type = MIPS_FPU_NONE;
- break;
- case bfd_mach_mips4650:
- fpu_type = MIPS_FPU_SINGLE;
- break;
- default:
- fpu_type = MIPS_FPU_DOUBLE;
- break;
- }
- else if (arches != NULL)
- fpu_type = gdbarch_tdep (arches->gdbarch)->mips_fpu_type;
- else
- fpu_type = MIPS_FPU_DOUBLE;
- if (gdbarch_debug)
- fprintf_unfiltered (gdb_stdlog,
- "mips_gdbarch_init: fpu_type = %d\n", fpu_type);
-
- /* Check for blatant incompatibilities. */
-
- /* If we have only 32-bit registers, then we can't debug a 64-bit
- ABI. */
- if (info.target_desc
- && tdesc_property (info.target_desc, PROPERTY_GP32) != NULL
- && mips_abi != MIPS_ABI_EABI32
- && mips_abi != MIPS_ABI_O32)
- {
- if (tdesc_data != NULL)
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
-
/* Try to find a pre-existing architecture. */
for (arches = gdbarch_list_lookup_by_info (arches, &info);
arches != NULL;
arches = gdbarch_list_lookup_by_info (arches->next, &info))
{
- /* MIPS needs to be pedantic about which ABI the object is
- using. */
+ /* MIPS needs to be pedantic about which ABI and the compressed
+ ISA variation the object is using. */
if (gdbarch_tdep (arches->gdbarch)->elf_flags != elf_flags)
continue;
if (gdbarch_tdep (arches->gdbarch)->mips_abi != mips_abi)
continue;
+ if (gdbarch_tdep (arches->gdbarch)->mips_isa != mips_isa)
+ continue;
/* Need to be pedantic about which register virtual size is
used. */
if (gdbarch_tdep (arches->gdbarch)->mips64_transfers_32bit_regs_p
!= mips64_transfers_32bit_regs_p)
continue;
/* Be pedantic about which FPU is selected. */
- if (gdbarch_tdep (arches->gdbarch)->mips_fpu_type != fpu_type)
+ if (MIPS_FPU_TYPE (arches->gdbarch) != fpu_type)
continue;
if (tdesc_data != NULL)
}
/* Need a new architecture. Fill in a target specific vector. */
- tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
+ tdep = XCNEW (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
tdep->elf_flags = elf_flags;
tdep->mips64_transfers_32bit_regs_p = mips64_transfers_32bit_regs_p;
tdep->found_abi = found_abi;
tdep->mips_abi = mips_abi;
+ tdep->mips_isa = mips_isa;
tdep->mips_fpu_type = fpu_type;
tdep->register_size_valid_p = 0;
tdep->register_size = 0;
- tdep->gregset = NULL;
- tdep->gregset64 = NULL;
- tdep->fpregset = NULL;
- tdep->fpregset64 = NULL;
if (info.target_desc)
{
set_gdbarch_elf_make_msymbol_special (gdbarch,
mips_elf_make_msymbol_special);
+ set_gdbarch_make_symbol_special (gdbarch, mips_make_symbol_special);
+ set_gdbarch_adjust_dwarf2_addr (gdbarch, mips_adjust_dwarf2_addr);
+ set_gdbarch_adjust_dwarf2_line (gdbarch, mips_adjust_dwarf2_line);
regnum = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct mips_regnum);
*regnum = mips_regnum;
set_gdbarch_push_dummy_code (gdbarch, mips_push_dummy_code);
set_gdbarch_frame_align (gdbarch, mips_frame_align);
+ set_gdbarch_print_float_info (gdbarch, mips_print_float_info);
+
set_gdbarch_convert_register_p (gdbarch, mips_convert_register_p);
set_gdbarch_register_to_value (gdbarch, mips_register_to_value);
set_gdbarch_value_to_register (gdbarch, mips_value_to_register);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_breakpoint_from_pc (gdbarch, mips_breakpoint_from_pc);
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch, mips_breakpoint_kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch, mips_sw_breakpoint_from_kind);
set_gdbarch_adjust_breakpoint_address (gdbarch,
mips_adjust_breakpoint_address);
set_gdbarch_skip_prologue (gdbarch, mips_skip_prologue);
- set_gdbarch_in_function_epilogue_p (gdbarch, mips_in_function_epilogue_p);
+ set_gdbarch_stack_frame_destroyed_p (gdbarch, mips_stack_frame_destroyed_p);
set_gdbarch_pointer_to_address (gdbarch, signed_pointer_to_address);
set_gdbarch_address_to_pointer (gdbarch, address_to_signed_pointer);
set_gdbarch_print_registers_info (gdbarch, mips_print_registers_info);
- if (mips_abi == MIPS_ABI_N32)
- set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips_n32);
- else if (mips_abi == MIPS_ABI_N64)
- set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips_n64);
+ set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips);
+ if (mips_abi == MIPS_ABI_N64)
+ set_gdbarch_disassembler_options_implicit
+ (gdbarch, (const char *) mips_disassembler_options_n64);
+ else if (mips_abi == MIPS_ABI_N32)
+ set_gdbarch_disassembler_options_implicit
+ (gdbarch, (const char *) mips_disassembler_options_n32);
else
- set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips);
+ set_gdbarch_disassembler_options_implicit
+ (gdbarch, (const char *) mips_disassembler_options_o32);
+ set_gdbarch_disassembler_options (gdbarch, &mips_disassembler_options);
+ set_gdbarch_valid_disassembler_options (gdbarch,
+ disassembler_options_mips ());
/* FIXME: cagney/2003-08-29: The macros target_have_steppable_watchpoint,
HAVE_NONSTEPPABLE_WATCHPOINT, and target_have_continuable_watchpoint
mips_register_g_packet_guesses (gdbarch);
/* Hook in OS ABI-specific overrides, if they have been registered. */
- info.tdep_info = (void *) tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
/* The hook may have adjusted num_regs, fetch the final value and
dwarf2_append_unwinders (gdbarch);
frame_unwind_append_unwinder (gdbarch, &mips_stub_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &mips_insn16_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &mips_micro_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &mips_insn32_frame_unwind);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
frame_base_append_sniffer (gdbarch, mips_stub_frame_base_sniffer);
frame_base_append_sniffer (gdbarch, mips_insn16_frame_base_sniffer);
+ frame_base_append_sniffer (gdbarch, mips_micro_frame_base_sniffer);
frame_base_append_sniffer (gdbarch, mips_insn32_frame_base_sniffer);
if (tdesc_data)
}
static void
-mips_abi_update (char *ignore_args, int from_tty, struct cmd_list_element *c)
+mips_abi_update (const char *ignore_args,
+ int from_tty, struct cmd_list_element *c)
{
struct gdbarch_info info;
struct cmd_list_element *ignored_cmd,
const char *ignored_value)
{
- if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_mips)
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_mips)
fprintf_filtered
(file,
"The MIPS ABI is unknown because the current architecture "
else
{
enum mips_abi global_abi = global_mips_abi ();
- enum mips_abi actual_abi = mips_abi (target_gdbarch);
+ enum mips_abi actual_abi = mips_abi (target_gdbarch ());
const char *actual_abi_str = mips_abi_strings[actual_abi];
if (global_abi == MIPS_ABI_UNKNOWN)
}
}
+/* Print out which MIPS compressed ISA encoding is used. */
+
+static void
+show_mips_compression (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("The compressed ISA encoding used is %s.\n"),
+ value);
+}
+
+/* Return a textual name for MIPS FPU type FPU_TYPE. */
+
+static const char *
+mips_fpu_type_str (enum mips_fpu_type fpu_type)
+{
+ switch (fpu_type)
+ {
+ case MIPS_FPU_NONE:
+ return "none";
+ case MIPS_FPU_SINGLE:
+ return "single";
+ case MIPS_FPU_DOUBLE:
+ return "double";
+ default:
+ return "???";
+ }
+}
+
static void
mips_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
{
fprintf_unfiltered (file,
"mips_dump_tdep: MIPS_DEFAULT_FPU_TYPE = %d (%s)\n",
MIPS_DEFAULT_FPU_TYPE,
- (MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_NONE ? "none"
- : MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_SINGLE ? "single"
- : MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_DOUBLE ? "double"
- : "???"));
+ mips_fpu_type_str (MIPS_DEFAULT_FPU_TYPE));
fprintf_unfiltered (file, "mips_dump_tdep: MIPS_EABI = %d\n",
MIPS_EABI (gdbarch));
fprintf_unfiltered (file,
"mips_dump_tdep: MIPS_FPU_TYPE = %d (%s)\n",
MIPS_FPU_TYPE (gdbarch),
- (MIPS_FPU_TYPE (gdbarch) == MIPS_FPU_NONE ? "none"
- : MIPS_FPU_TYPE (gdbarch) == MIPS_FPU_SINGLE ? "single"
- : MIPS_FPU_TYPE (gdbarch) == MIPS_FPU_DOUBLE ? "double"
- : "???"));
+ mips_fpu_type_str (MIPS_FPU_TYPE (gdbarch)));
}
-extern initialize_file_ftype _initialize_mips_tdep; /* -Wmissing-prototypes */
-
void
_initialize_mips_tdep (void)
{
static struct cmd_list_element *mipsfpulist = NULL;
- struct cmd_list_element *c;
mips_abi_string = mips_abi_strings[MIPS_ABI_UNKNOWN];
if (MIPS_ABI_LAST + 1
gdbarch_register (bfd_arch_mips, mips_gdbarch_init, mips_dump_tdep);
- mips_pdr_data = register_objfile_data ();
-
/* Create feature sets with the appropriate properties. The values
are not important. */
mips_tdesc_gp32 = allocate_target_description ();
show_mips_abi,
&setmipscmdlist, &showmipscmdlist);
+ /* Allow the user to set the ISA to assume for compressed code if ELF
+ file flags don't tell or there is no program file selected. This
+ setting is updated whenever unambiguous ELF file flags are interpreted,
+ and carried over to subsequent sessions. */
+ add_setshow_enum_cmd ("compression", class_obscure, mips_compression_strings,
+ &mips_compression_string, _("\
+Set the compressed ISA encoding used by MIPS code."), _("\
+Show the compressed ISA encoding used by MIPS code."), _("\
+Select the compressed ISA encoding used in functions that have no symbol\n\
+information available. The encoding can be set to either of:\n\
+ mips16\n\
+ micromips\n\
+and is updated automatically from ELF file flags if available."),
+ mips_abi_update,
+ show_mips_compression,
+ &setmipscmdlist, &showmipscmdlist);
+
/* Let the user turn off floating point and set the fence post for
heuristic_proc_start. */
&setlist, &showlist);
/* Debug this files internals. */
- add_setshow_zinteger_cmd ("mips", class_maintenance,
- &mips_debug, _("\
+ add_setshow_zuinteger_cmd ("mips", class_maintenance,
+ &mips_debug, _("\
Set mips debugging."), _("\
Show mips debugging."), _("\
When non-zero, mips specific debugging is enabled."),
- NULL,
- NULL, /* FIXME: i18n: Mips debugging is
- currently %s. */
- &setdebuglist, &showdebuglist);
+ NULL,
+ NULL, /* FIXME: i18n: Mips debugging is
+ currently %s. */
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff