X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fmn10300-tdep.c;h=116a03e7d071f573948ecd6b928b2325f4266c5f;hb=691bf19c4ea5b2f5d615c4116649daf32f81cc7d;hp=0cbff1d3448e45fbf62c90c2f425d8c8e1970f4d;hpb=f30992d46d166a62fb5dbb5b86b625ee019a7107;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c
index 0cbff1d344..116a03e7d0 100644
--- a/gdb/mn10300-tdep.c
+++ b/gdb/mn10300-tdep.c
@@ -1,13 +1,12 @@
/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
- Foundation, Inc.
+ Copyright (C) 1996-2005, 2007-2012 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -16,70 +15,238 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see . */
#include "defs.h"
-#include "frame.h"
-#include "inferior.h"
-#include "target.h"
-#include "value.h"
-#include "bfd.h"
-#include "gdb_string.h"
-#include "gdbcore.h"
-#include "symfile.h"
-#include "regcache.h"
#include "arch-utils.h"
-#include "gdb_assert.h"
#include "dis-asm.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "gdbcore.h" /* For write_memory_unsigned_integer. */
+#include "value.h"
+#include "gdbtypes.h"
+#include "frame.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "symtab.h"
+#include "dwarf2-frame.h"
+#include "osabi.h"
+#include "infcall.h"
+#include "prologue-value.h"
+#include "target.h"
+
+#include "mn10300-tdep.h"
-#define D0_REGNUM 0
-#define D2_REGNUM 2
-#define D3_REGNUM 3
-#define A0_REGNUM 4
-#define A2_REGNUM 6
-#define A3_REGNUM 7
-#define MDR_REGNUM 10
-#define PSW_REGNUM 11
-#define LIR_REGNUM 12
-#define LAR_REGNUM 13
-#define MDRQ_REGNUM 14
-#define E0_REGNUM 15
-#define MCRH_REGNUM 26
-#define MCRL_REGNUM 27
-#define MCVF_REGNUM 28
-
-enum movm_register_bits {
- movm_exother_bit = 0x01,
- movm_exreg1_bit = 0x02,
- movm_exreg0_bit = 0x04,
- movm_other_bit = 0x08,
- movm_a3_bit = 0x10,
- movm_a2_bit = 0x20,
- movm_d3_bit = 0x40,
- movm_d2_bit = 0x80
-};
-extern void _initialize_mn10300_tdep (void);
-static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi,
- CORE_ADDR pc);
+/* The am33-2 has 64 registers. */
+#define MN10300_MAX_NUM_REGS 64
-/* mn10300 private data */
-struct gdbarch_tdep
+/* This structure holds the results of a prologue analysis. */
+struct mn10300_prologue
{
- int am33_mode;
-#define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode)
+ /* The architecture for which we generated this prologue info. */
+ struct gdbarch *gdbarch;
+
+ /* The offset from the frame base to the stack pointer --- always
+ zero or negative.
+
+ Calling this a "size" is a bit misleading, but given that the
+ stack grows downwards, using offsets for everything keeps one
+ from going completely sign-crazy: you never change anything's
+ sign for an ADD instruction; always change the second operand's
+ sign for a SUB instruction; and everything takes care of
+ itself. */
+ int frame_size;
+
+ /* Non-zero if this function has initialized the frame pointer from
+ the stack pointer, zero otherwise. */
+ int has_frame_ptr;
+
+ /* If has_frame_ptr is non-zero, this is the offset from the frame
+ base to where the frame pointer points. This is always zero or
+ negative. */
+ int frame_ptr_offset;
+
+ /* The address of the first instruction at which the frame has been
+ set up and the arguments are where the debug info says they are
+ --- as best as we can tell. */
+ CORE_ADDR prologue_end;
+
+ /* reg_offset[R] is the offset from the CFA at which register R is
+ saved, or 1 if register R has not been saved. (Real values are
+ always zero or negative.) */
+ int reg_offset[MN10300_MAX_NUM_REGS];
};
-/* Additional info used by the frame */
-struct frame_extra_info
- {
- int status;
- int stack_size;
- };
+/* Compute the alignment required by a type. */
+
+static int
+mn10300_type_align (struct type *type)
+{
+ int i, align = 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ return TYPE_LENGTH (type);
+
+ case TYPE_CODE_COMPLEX:
+ return TYPE_LENGTH (type) / 2;
+
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
+ while (align < falign)
+ align <<= 1;
+ }
+ return align;
+
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ elligible for returning in registers. */
+ return 256;
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
+
+ default:
+ internal_error (__FILE__, __LINE__, _("bad switch"));
+ }
+}
+
+/* Should call_function allocate stack space for a struct return? */
+static int
+mn10300_use_struct_convention (struct type *type)
+{
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ /* Structures with a single field are handled as the field
+ itself. */
+ if (TYPE_NFIELDS (type) == 1)
+ return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
+
+ /* Structures with word or double-word size are passed in memory, as
+ long as they require at least word alignment. */
+ if (mn10300_type_align (type) >= 4)
+ return 0;
+
+ return 1;
+
+ /* Arrays are addressable, so they're never returned in
+ registers. This condition can only hold when the array is
+ the only field of a struct or union. */
+ case TYPE_CODE_ARRAY:
+ return 1;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_use_struct_convention (check_typedef (type));
+
+ default:
+ return 0;
+ }
+}
+
+static void
+mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, const void *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+
+ if (len <= regsz)
+ regcache_raw_write_part (regcache, reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_write (regcache, reg, valbuf);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_write_part (regcache, reg+1, 0,
+ len - regsz, (char *) valbuf + regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value %d bytes long."), len);
+}
+
+static void
+mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *valbuf)
+{
+ char buf[MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+ if (len <= regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, len);
+ }
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, regsz);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_read (regcache, reg + 1, buf);
+ memcpy ((char *) valbuf + regsz, buf, len - regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value %d bytes long."), len);
+}
+
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+mn10300_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (mn10300_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
static char *
register_name (int reg, char **regs, long sizeof_regs)
@@ -91,7 +258,7 @@ register_name (int reg, char **regs, long sizeof_regs)
}
static const char *
-mn10300_generic_register_name (int reg)
+mn10300_generic_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
@@ -104,7 +271,7 @@ mn10300_generic_register_name (int reg)
static const char *
-am33_register_name (int reg)
+am33_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
@@ -114,78 +281,42 @@ am33_register_name (int reg)
};
return register_name (reg, regs, sizeof regs);
}
-
-static CORE_ADDR
-mn10300_saved_pc_after_call (struct frame_info *fi)
+
+static const char *
+am33_2_register_name (struct gdbarch *gdbarch, int reg)
{
- return read_memory_integer (read_register (SP_REGNUM), 4);
+ static char *regs[] =
+ {
+ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
+ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
+ "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
+ "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
+ "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
+ "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
+ "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
+ };
+ return register_name (reg, regs, sizeof regs);
}
-static void
-mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+static struct type *
+mn10300_register_type (struct gdbarch *gdbarch, int reg)
{
- if (TYPE_CODE (type) == TYPE_CODE_PTR)
- memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (4), TYPE_LENGTH (type));
- else
- memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (0), TYPE_LENGTH (type));
+ return builtin_type (gdbarch)->builtin_int;
}
static CORE_ADDR
-mn10300_extract_struct_value_address (char *regbuf)
+mn10300_read_pc (struct regcache *regcache)
{
- return extract_unsigned_integer (regbuf + DEPRECATED_REGISTER_BYTE (4),
- REGISTER_RAW_SIZE (4));
+ ULONGEST val;
+ regcache_cooked_read_unsigned (regcache, E_PC_REGNUM, &val);
+ return val;
}
static void
-mn10300_store_return_value (struct type *type, char *valbuf)
-{
- if (TYPE_CODE (type) == TYPE_CODE_PTR)
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (4), valbuf,
- TYPE_LENGTH (type));
- else
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (0), valbuf,
- TYPE_LENGTH (type));
-}
-
-static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR);
-static struct frame_info *
-analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame)
-{
- static struct frame_info *dummy = NULL;
- if (dummy == NULL)
- {
- struct frame_extra_info *extra_info;
- CORE_ADDR *saved_regs;
- dummy = deprecated_frame_xmalloc ();
- saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS);
- deprecated_set_frame_saved_regs_hack (dummy, saved_regs);
- extra_info = XMALLOC (struct frame_extra_info);
- deprecated_set_frame_extra_info_hack (dummy, extra_info);
- }
- deprecated_set_frame_next_hack (dummy, NULL);
- deprecated_set_frame_prev_hack (dummy, NULL);
- deprecated_update_frame_pc_hack (dummy, pc);
- deprecated_update_frame_base_hack (dummy, frame);
- get_frame_extra_info (dummy)->status = 0;
- get_frame_extra_info (dummy)->stack_size = 0;
- memset (deprecated_get_frame_saved_regs (dummy), '\000', SIZEOF_FRAME_SAVED_REGS);
- mn10300_analyze_prologue (dummy, pc);
- return dummy;
-}
-
-/* Values for frame_info.status */
-
-#define MY_FRAME_IN_SP 0x1
-#define MY_FRAME_IN_FP 0x2
-#define NO_MORE_FRAMES 0x4
-
-
-/* Should call_function allocate stack space for a struct return? */
-static int
-mn10300_use_struct_convention (int gcc_p, struct type *type)
+mn10300_write_pc (struct regcache *regcache, CORE_ADDR val)
{
- return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+ regcache_cooked_write_unsigned (regcache, E_PC_REGNUM, val);
}
/* The breakpoint instruction must be the same size as the smallest
@@ -196,1038 +327,1152 @@ mn10300_use_struct_convention (int gcc_p, struct type *type)
one, so we defined it ourselves. */
const static unsigned char *
-mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+mn10300_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
+ int *bp_size)
{
- static char breakpoint[] =
- {0xff};
+ static char breakpoint[] = {0xff};
*bp_size = 1;
return breakpoint;
}
-
-/* Fix fi->frame if it's bogus at this point. This is a helper
- function for mn10300_analyze_prologue. */
-
+/* Model the semantics of pushing a register onto the stack. This
+ is a helper function for mn10300_analyze_prologue, below. */
static void
-fix_frame_pointer (struct frame_info *fi, int stack_size)
+push_reg (pv_t *regs, struct pv_area *stack, int regnum)
{
- if (fi && get_next_frame (fi) == NULL)
- {
- if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP)
- deprecated_update_frame_base_hack (fi, read_sp () - stack_size);
- else if (get_frame_extra_info (fi)->status & MY_FRAME_IN_FP)
- deprecated_update_frame_base_hack (fi, read_register (A3_REGNUM));
- }
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ pv_area_store (stack, regs[E_SP_REGNUM], 4, regs[regnum]);
}
+/* Translate an "r" register number extracted from an instruction encoding
+ into a GDB register number. Adapted from a simulator function
+ of the same name; see am33.igen. */
+static int
+translate_rreg (int rreg)
+{
+ /* The higher register numbers actually correspond to the
+ basic machine's address and data registers. */
+ if (rreg > 7 && rreg < 12)
+ return E_A0_REGNUM + rreg - 8;
+ else if (rreg > 11 && rreg < 16)
+ return E_D0_REGNUM + rreg - 12;
+ else
+ return E_E0_REGNUM + rreg;
+}
-/* Set offsets of registers saved by movm instruction.
- This is a helper function for mn10300_analyze_prologue. */
+/* Find saved registers in a 'struct pv_area'; we pass this to pv_area_scan.
+ If VALUE is a saved register, ADDR says it was saved at a constant
+ offset from the frame base, and SIZE indicates that the whole
+ register was saved, record its offset in RESULT_UNTYPED. */
static void
-set_movm_offsets (struct frame_info *fi, int movm_args)
+check_for_saved (void *result_untyped, pv_t addr, CORE_ADDR size, pv_t value)
{
- int offset = 0;
+ struct mn10300_prologue *result = (struct mn10300_prologue *) result_untyped;
- if (fi == NULL || movm_args == 0)
- return;
+ if (value.kind == pvk_register
+ && value.k == 0
+ && pv_is_register (addr, E_SP_REGNUM)
+ && size == register_size (result->gdbarch, value.reg))
+ result->reg_offset[value.reg] = addr.k;
+}
- if (movm_args & movm_other_bit)
- {
- /* The `other' bit leaves a blank area of four bytes at the
- beginning of its block of saved registers, making it 32 bytes
- long in total. */
- deprecated_get_frame_saved_regs (fi)[LAR_REGNUM] = get_frame_base (fi) + offset + 4;
- deprecated_get_frame_saved_regs (fi)[LIR_REGNUM] = get_frame_base (fi) + offset + 8;
- deprecated_get_frame_saved_regs (fi)[MDR_REGNUM] = get_frame_base (fi) + offset + 12;
- deprecated_get_frame_saved_regs (fi)[A0_REGNUM + 1] = get_frame_base (fi) + offset + 16;
- deprecated_get_frame_saved_regs (fi)[A0_REGNUM] = get_frame_base (fi) + offset + 20;
- deprecated_get_frame_saved_regs (fi)[D0_REGNUM + 1] = get_frame_base (fi) + offset + 24;
- deprecated_get_frame_saved_regs (fi)[D0_REGNUM] = get_frame_base (fi) + offset + 28;
- offset += 32;
- }
- if (movm_args & movm_a3_bit)
- {
- deprecated_get_frame_saved_regs (fi)[A3_REGNUM] = get_frame_base (fi) + offset;
- offset += 4;
- }
- if (movm_args & movm_a2_bit)
- {
- deprecated_get_frame_saved_regs (fi)[A2_REGNUM] = get_frame_base (fi) + offset;
- offset += 4;
- }
- if (movm_args & movm_d3_bit)
- {
- deprecated_get_frame_saved_regs (fi)[D3_REGNUM] = get_frame_base (fi) + offset;
- offset += 4;
- }
- if (movm_args & movm_d2_bit)
+/* Analyze the prologue to determine where registers are saved,
+ the end of the prologue, etc. The result of this analysis is
+ returned in RESULT. See struct mn10300_prologue above for more
+ information. */
+static void
+mn10300_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct mn10300_prologue *result)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR pc, next_pc;
+ int rn;
+ pv_t regs[MN10300_MAX_NUM_REGS];
+ struct pv_area *stack;
+ struct cleanup *back_to;
+ CORE_ADDR after_last_frame_setup_insn = start_pc;
+ int am33_mode = AM33_MODE (gdbarch);
+
+ memset (result, 0, sizeof (*result));
+ result->gdbarch = gdbarch;
+
+ for (rn = 0; rn < MN10300_MAX_NUM_REGS; rn++)
{
- deprecated_get_frame_saved_regs (fi)[D2_REGNUM] = get_frame_base (fi) + offset;
- offset += 4;
+ regs[rn] = pv_register (rn, 0);
+ result->reg_offset[rn] = 1;
}
- if (AM33_MODE)
+ stack = make_pv_area (E_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+ back_to = make_cleanup_free_pv_area (stack);
+
+ /* The typical call instruction will have saved the return address on the
+ stack. Space for the return address has already been preallocated in
+ the caller's frame. It's possible, such as when using -mrelax with gcc
+ that other registers were saved as well. If this happens, we really
+ have no chance of deciphering the frame. DWARF info can save the day
+ when this happens. */
+ pv_area_store (stack, regs[E_SP_REGNUM], 4, regs[E_PC_REGNUM]);
+
+ pc = start_pc;
+ while (pc < limit_pc)
{
- if (movm_args & movm_exother_bit)
- {
- deprecated_get_frame_saved_regs (fi)[MCVF_REGNUM] = get_frame_base (fi) + offset;
- deprecated_get_frame_saved_regs (fi)[MCRL_REGNUM] = get_frame_base (fi) + offset + 4;
- deprecated_get_frame_saved_regs (fi)[MCRH_REGNUM] = get_frame_base (fi) + offset + 8;
- deprecated_get_frame_saved_regs (fi)[MDRQ_REGNUM] = get_frame_base (fi) + offset + 12;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 1] = get_frame_base (fi) + offset + 16;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 0] = get_frame_base (fi) + offset + 20;
- offset += 24;
- }
- if (movm_args & movm_exreg1_bit)
- {
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 7] = get_frame_base (fi) + offset;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 6] = get_frame_base (fi) + offset + 4;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 5] = get_frame_base (fi) + offset + 8;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 4] = get_frame_base (fi) + offset + 12;
- offset += 16;
- }
- if (movm_args & movm_exreg0_bit)
- {
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 3] = get_frame_base (fi) + offset;
- deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 2] = get_frame_base (fi) + offset + 4;
- offset += 8;
- }
- }
-}
+ int status;
+ gdb_byte instr[2];
+ /* Instructions can be as small as one byte; however, we usually
+ need at least two bytes to do the decoding, so fetch that many
+ to begin with. */
+ status = target_read_memory (pc, instr, 2);
+ if (status != 0)
+ break;
-/* The main purpose of this file is dealing with prologues to extract
- information about stack frames and saved registers.
+ /* movm [regs], sp */
+ if (instr[0] == 0xcf)
+ {
+ gdb_byte save_mask;
- In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
- function is pretty readable, and has a nice explanation of how the
- prologue is generated. The prologues generated by that code will
- have the following form (NOTE: the current code doesn't handle all
- this!):
+ save_mask = instr[1];
- + If this is an old-style varargs function, then its arguments
- need to be flushed back to the stack:
-
- mov d0,(4,sp)
- mov d1,(4,sp)
+ if ((save_mask & movm_exreg0_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E2_REGNUM);
+ push_reg (regs, stack, E_E3_REGNUM);
+ }
+ if ((save_mask & movm_exreg1_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E4_REGNUM);
+ push_reg (regs, stack, E_E5_REGNUM);
+ push_reg (regs, stack, E_E6_REGNUM);
+ push_reg (regs, stack, E_E7_REGNUM);
+ }
+ if ((save_mask & movm_exother_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E0_REGNUM);
+ push_reg (regs, stack, E_E1_REGNUM);
+ push_reg (regs, stack, E_MDRQ_REGNUM);
+ push_reg (regs, stack, E_MCRH_REGNUM);
+ push_reg (regs, stack, E_MCRL_REGNUM);
+ push_reg (regs, stack, E_MCVF_REGNUM);
+ }
+ if (save_mask & movm_d2_bit)
+ push_reg (regs, stack, E_D2_REGNUM);
+ if (save_mask & movm_d3_bit)
+ push_reg (regs, stack, E_D3_REGNUM);
+ if (save_mask & movm_a2_bit)
+ push_reg (regs, stack, E_A2_REGNUM);
+ if (save_mask & movm_a3_bit)
+ push_reg (regs, stack, E_A3_REGNUM);
+ if (save_mask & movm_other_bit)
+ {
+ push_reg (regs, stack, E_D0_REGNUM);
+ push_reg (regs, stack, E_D1_REGNUM);
+ push_reg (regs, stack, E_A0_REGNUM);
+ push_reg (regs, stack, E_A1_REGNUM);
+ push_reg (regs, stack, E_MDR_REGNUM);
+ push_reg (regs, stack, E_LIR_REGNUM);
+ push_reg (regs, stack, E_LAR_REGNUM);
+ /* The `other' bit leaves a blank area of four bytes at
+ the beginning of its block of saved registers, making
+ it 32 bytes long in total. */
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ }
- + If we use any of the callee-saved registers, save them now.
-
- movm [some callee-saved registers],(sp)
+ pc += 2;
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov sp, aN */
+ else if ((instr[0] & 0xfc) == 0x3c)
+ {
+ int aN = instr[0] & 0x03;
- + If we have any floating-point registers to save:
+ regs[E_A0_REGNUM + aN] = regs[E_SP_REGNUM];
- - Decrement the stack pointer to reserve space for the registers.
- If the function doesn't need a frame pointer, we may combine
- this with the adjustment that reserves space for the frame.
+ pc += 1;
+ if (aN == 3)
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov aM, aN */
+ else if ((instr[0] & 0xf0) == 0x90
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
+ {
+ int aN = instr[0] & 0x03;
+ int aM = (instr[0] & 0x0c) >> 2;
- add -SIZE, sp
+ regs[E_A0_REGNUM + aN] = regs[E_A0_REGNUM + aM];
- - Save the floating-point registers. We have two possible
- strategies:
+ pc += 1;
+ }
+ /* mov dM, dN */
+ else if ((instr[0] & 0xf0) == 0x80
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
+ {
+ int dN = instr[0] & 0x03;
+ int dM = (instr[0] & 0x0c) >> 2;
- . Save them at fixed offset from the SP:
+ regs[E_D0_REGNUM + dN] = regs[E_D0_REGNUM + dM];
- fmov fsN,(OFFSETN,sp)
- fmov fsM,(OFFSETM,sp)
- ...
+ pc += 1;
+ }
+ /* mov aM, dN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xd0)
+ {
+ int dN = instr[1] & 0x03;
+ int aM = (instr[1] & 0x0c) >> 2;
- Note that, if OFFSETN happens to be zero, you'll get the
- different opcode: fmov fsN,(sp)
+ regs[E_D0_REGNUM + dN] = regs[E_A0_REGNUM + aM];
- . Or, set a0 to the start of the save area, and then use
- post-increment addressing to save the FP registers.
+ pc += 2;
+ }
+ /* mov dM, aN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xe0)
+ {
+ int aN = instr[1] & 0x03;
+ int dM = (instr[1] & 0x0c) >> 2;
- mov sp, a0
- add SIZE, a0
- fmov fsN,(a0+)
- fmov fsM,(a0+)
- ...
+ regs[E_A0_REGNUM + aN] = regs[E_D0_REGNUM + dM];
- + If the function needs a frame pointer, we set it here.
+ pc += 2;
+ }
+ /* add imm8, SP */
+ else if (instr[0] == 0xf8 && instr[1] == 0xfe)
+ {
+ gdb_byte buf[1];
+ LONGEST imm8;
- mov sp, a3
- + Now we reserve space for the stack frame proper. This could be
- merged into the `add -SIZE, sp' instruction for FP saves up
- above, unless we needed to set the frame pointer in the previous
- step, or the frame is so large that allocating the whole thing at
- once would put the FP register save slots out of reach of the
- addressing mode (128 bytes).
-
- add -SIZE, sp
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- One day we might keep the stack pointer constant, that won't
- change the code for prologues, but it will make the frame
- pointerless case much more common. */
+ imm8 = extract_signed_integer (buf, 1, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm8);
-/* Analyze the prologue to determine where registers are saved,
- the end of the prologue, etc etc. Return the end of the prologue
- scanned.
+ pc += 3;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm16, SP */
+ else if (instr[0] == 0xfa && instr[1] == 0xfe)
+ {
+ gdb_byte buf[2];
+ LONGEST imm16;
- We store into FI (if non-null) several tidbits of information:
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- * stack_size -- size of this stack frame. Note that if we stop in
- certain parts of the prologue/epilogue we may claim the size of the
- current frame is zero. This happens when the current frame has
- not been allocated yet or has already been deallocated.
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm16);
- * fsr -- Addresses of registers saved in the stack by this frame.
+ pc += 4;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm32, SP */
+ else if (instr[0] == 0xfc && instr[1] == 0xfe)
+ {
+ gdb_byte buf[4];
+ LONGEST imm32;
- * status -- A (relatively) generic status indicator. It's a bitmask
- with the following bits:
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- MY_FRAME_IN_SP: The base of the current frame is actually in
- the stack pointer. This can happen for frame pointerless
- functions, or cases where we're stopped in the prologue/epilogue
- itself. For these cases mn10300_analyze_prologue will need up
- update fi->frame before returning or analyzing the register
- save instructions.
- MY_FRAME_IN_FP: The base of the current frame is in the
- frame pointer register ($a3).
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm32);
- NO_MORE_FRAMES: Set this if the current frame is "start" or
- if the first instruction looks like mov ,sp. This tells
- frame chain to not bother trying to unwind past this frame. */
+ pc += 6;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm8, aN */
+ else if ((instr[0] & 0xfc) == 0x20)
+ {
+ int aN;
+ LONGEST imm8;
-static CORE_ADDR
-mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc)
-{
- CORE_ADDR func_addr, func_end, addr, stop;
- CORE_ADDR stack_size;
- int imm_size;
- unsigned char buf[4];
- int status, movm_args = 0;
- char *name;
-
- /* Use the PC in the frame if it's provided to look up the
- start of this function.
-
- Note: kevinb/2003-07-16: We used to do the following here:
- pc = (fi ? get_frame_pc (fi) : pc);
- But this is (now) badly broken when called from analyze_dummy_frame().
- */
- pc = (pc ? pc : get_frame_pc (fi));
-
- /* Find the start of this function. */
- status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
-
- /* Do nothing if we couldn't find the start of this function or if we're
- stopped at the first instruction in the prologue. */
- if (status == 0)
- {
- return pc;
- }
+ aN = instr[0] & 0x03;
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
- /* If we're in start, then give up. */
- if (strcmp (name, "start") == 0)
- {
- if (fi != NULL)
- get_frame_extra_info (fi)->status = NO_MORE_FRAMES;
- return pc;
- }
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm8);
- /* At the start of a function our frame is in the stack pointer. */
- if (fi)
- get_frame_extra_info (fi)->status = MY_FRAME_IN_SP;
+ pc += 2;
+ }
+ /* add imm16, aN */
+ else if (instr[0] == 0xfa && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm16;
+ gdb_byte buf[2];
- /* Get the next two bytes into buf, we need two because rets is a two
- byte insn and the first isn't enough to uniquely identify it. */
- status = read_memory_nobpt (pc, buf, 2);
- if (status != 0)
- return pc;
+ aN = instr[1] & 0x03;
-#if 0
- /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of
- changes to the frame in prologue examination code. */
- /* If we're physically on an "rets" instruction, then our frame has
- already been deallocated. Note this can also be true for retf
- and ret if they specify a size of zero.
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- In this case fi->frame is bogus, we need to fix it. */
- if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
- }
- /* Similarly if we're stopped on the first insn of a prologue as our
- frame hasn't been allocated yet. */
- if (fi && get_frame_pc (fi) == func_addr)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
- }
-#endif
+ imm16 = extract_signed_integer (buf, 2, byte_order);
- /* Figure out where to stop scanning. */
- stop = fi ? pc : func_end;
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm16);
- /* Don't walk off the end of the function. */
- stop = stop > func_end ? func_end : stop;
+ pc += 4;
+ }
+ /* add imm32, aN */
+ else if (instr[0] == 0xfc && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm32;
+ gdb_byte buf[4];
- /* Start scanning on the first instruction of this function. */
- addr = func_addr;
+ aN = instr[1] & 0x03;
- /* Suck in two bytes. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- fix_frame_pointer (fi, 0);
- return addr;
- }
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- /* First see if this insn sets the stack pointer from a register; if
- so, it's probably the initialization of the stack pointer in _start,
- so mark this as the bottom-most frame. */
- if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
- {
- if (fi)
- get_frame_extra_info (fi)->status = NO_MORE_FRAMES;
- return addr;
- }
+ imm32 = extract_signed_integer (buf, 2, byte_order);
- /* Now look for movm [regs],sp, which saves the callee saved registers.
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm32);
+ pc += 6;
+ }
+ /* fmov fsM, (rN) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ gdb_byte buf[1];
- At this time we don't know if fi->frame is valid, so we only note
- that we encountered a movm instruction. Later, we'll set the entries
- in fsr.regs as needed. */
- if (buf[0] == 0xcf)
- {
- /* Extract the register list for the movm instruction. */
- status = read_memory_nobpt (addr + 1, buf, 1);
- movm_args = *buf;
+ Y = (instr[1] & 0x02) >> 1;
- addr += 2;
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
- {
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ pv_area_store (stack, regs[translate_rreg (rN)], 4,
+ regs[E_FS0_REGNUM + fsM]);
- /* Get the next two bytes so the prologue scan can continue. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
+ pc += 3;
+ }
+ /* fmov fsM, (sp) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x34)
{
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
+ int fsM, sM, Y;
+ gdb_byte buf[1];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
- }
+ Y = (instr[1] & 0x02) >> 1;
- /* Now see if we set up a frame pointer via "mov sp,a3" */
- if (buf[0] == 0x3f)
- {
- addr += 1;
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- /* The frame pointer is now valid. */
- if (fi)
- {
- get_frame_extra_info (fi)->status |= MY_FRAME_IN_FP;
- get_frame_extra_info (fi)->status &= ~MY_FRAME_IN_SP;
- }
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ pv_area_store (stack, regs[E_SP_REGNUM], 4,
+ regs[E_FS0_REGNUM + fsM]);
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
+ pc += 3;
}
-
- /* Get two more bytes so scanning can continue. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
+ /* fmov fsM, (rN, rI) */
+ else if (instr[0] == 0xfb && instr[1] == 0x37)
{
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ int fsM, sM, Z, rN, rI;
+ gdb_byte buf[2];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
- }
- /* Next we should allocate the local frame. No more prologue insns
- are found after allocating the local frame.
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- Search for add imm8,sp (0xf8feXX)
- or add imm16,sp (0xfafeXXXX)
- or add imm32,sp (0xfcfeXXXXXXXX).
+ rI = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ sM = (buf[1] & 0xf0) >> 4;
+ Z = (buf[1] & 0x02) >> 1;
+ fsM = (Z << 4) | sM;
- If none of the above was found, then this prologue has no
- additional stack. */
+ pv_area_store (stack,
+ pv_add (regs[translate_rreg (rN)],
+ regs[translate_rreg (rI)]),
+ 4, regs[E_FS0_REGNUM + fsM]);
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ pc += 4;
+ }
+ /* fmov fsM, (d8, rN) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d8;
+ gdb_byte buf[2];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ Y = (instr[1] & 0x02) >> 1;
- imm_size = 0;
- if (buf[0] == 0xf8 && buf[1] == 0xfe)
- imm_size = 1;
- else if (buf[0] == 0xfa && buf[1] == 0xfe)
- imm_size = 2;
- else if (buf[0] == 0xfc && buf[1] == 0xfe)
- imm_size = 4;
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- if (imm_size != 0)
- {
- /* Suck in imm_size more bytes, they'll hold the size of the
- current frame. */
- status = read_memory_nobpt (addr + 2, buf, imm_size);
- if (status != 0)
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 4;
+ }
+ /* fmov fsM, (d24, rN) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x30)
{
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ int fsM, sM, Y, rN;
+ LONGEST d24;
+ gdb_byte buf[4];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 6;
}
+ /* fmov fsM, (d32, rN) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d32;
+ gdb_byte buf[5];
- /* Note the size of the stack in the frame info structure. */
- stack_size = extract_signed_integer (buf, imm_size);
- if (fi)
- get_frame_extra_info (fi)->stack_size = stack_size;
+ Y = (instr[1] & 0x02) >> 1;
- /* We just consumed 2 + imm_size bytes. */
- addr += 2 + imm_size;
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
- /* No more prologue insns follow, so begin preparation to return. */
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, stack_size);
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
- /* We never found an insn which allocates local stack space, regardless
- this is the end of the prologue. */
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ pc += 7;
+ }
+ /* fmov fsM, (d8, SP) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d8;
+ gdb_byte buf[2];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
-}
+ Y = (instr[1] & 0x02) >> 1;
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
-/* Function: saved_regs_size
- Return the size in bytes of the register save area, based on the
- saved_regs array in FI. */
-static int
-saved_regs_size (struct frame_info *fi)
-{
- int adjust = 0;
- int i;
-
- /* Reserve four bytes for every register saved. */
- for (i = 0; i < NUM_REGS; i++)
- if (deprecated_get_frame_saved_regs (fi)[i])
- adjust += 4;
-
- /* If we saved LIR, then it's most likely we used a `movm'
- instruction with the `other' bit set, in which case the SP is
- decremented by an extra four bytes, "to simplify calculation
- of the transfer area", according to the processor manual. */
- if (deprecated_get_frame_saved_regs (fi)[LIR_REGNUM])
- adjust += 4;
-
- return adjust;
-}
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
-/* Function: frame_chain
- Figure out and return the caller's frame pointer given current
- frame_info struct.
+ pc += 4;
+ }
+ /* fmov fsM, (d24, SP) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d24;
+ gdb_byte buf[4];
- We don't handle dummy frames yet but we would probably just return the
- stack pointer that was in use at the time the function call was made? */
+ Y = (instr[1] & 0x02) >> 1;
-static CORE_ADDR
-mn10300_frame_chain (struct frame_info *fi)
-{
- struct frame_info *dummy;
- /* Walk through the prologue to determine the stack size,
- location of saved registers, end of the prologue, etc. */
- if (get_frame_extra_info (fi)->status == 0)
- mn10300_analyze_prologue (fi, (CORE_ADDR) 0);
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
- if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES)
- return 0;
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
- /* Now that we've analyzed our prologue, determine the frame
- pointer for our caller.
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
- If our caller has a frame pointer, then we need to
- find the entry value of $a3 to our function.
+ pc += 6;
+ }
+ /* fmov fsM, (d32, SP) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d32;
+ gdb_byte buf[5];
- If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
- location pointed to by fsr.regs[A3_REGNUM].
+ Y = (instr[1] & 0x02) >> 1;
- Else it's still in $a3.
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
- If our caller does not have a frame pointer, then his
- frame base is fi->frame + -caller's stack size. */
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
- /* The easiest way to get that info is to analyze our caller's frame.
- So we set up a dummy frame and call mn10300_analyze_prologue to
- find stuff for us. */
- dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi));
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
- if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP)
- {
- /* Our caller has a frame pointer. So find the frame in $a3 or
- in the stack. */
- if (deprecated_get_frame_saved_regs (fi)[A3_REGNUM])
- return (read_memory_integer (deprecated_get_frame_saved_regs (fi)[A3_REGNUM],
- DEPRECATED_REGISTER_SIZE));
- else
- return read_register (A3_REGNUM);
- }
- else
- {
- int adjust = saved_regs_size (fi);
+ pc += 7;
+ }
+ /* fmov fsM, (rN+) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ gdb_byte buf[1];
- /* Our caller does not have a frame pointer. So his frame starts
- at the base of our frame (fi->frame) + register save space
- + . */
- return get_frame_base (fi) + adjust + -get_frame_extra_info (dummy)->stack_size;
- }
-}
+ Y = (instr[1] & 0x02) >> 1;
-/* Function: skip_prologue
- Return the address of the first inst past the prologue of the function. */
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
-static CORE_ADDR
-mn10300_skip_prologue (CORE_ADDR pc)
-{
- /* We used to check the debug symbols, but that can lose if
- we have a null prologue. */
- return mn10300_analyze_prologue (NULL, pc);
-}
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
-/* generic_pop_current_frame calls this function if the current
- frame isn't a dummy frame. */
-static void
-mn10300_pop_frame_regular (struct frame_info *frame)
-{
- int regnum;
+ rN_regnum = translate_rreg (rN);
- write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
+ pv_area_store (stack, regs[rN_regnum], 4,
+ regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], 4);
- /* Restore any saved registers. */
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (deprecated_get_frame_saved_regs (frame)[regnum] != 0)
- {
- ULONGEST value;
+ pc += 3;
+ }
+ /* fmov fsM, (rN+, imm8) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm8;
+ gdb_byte buf[2];
- value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
+ Y = (instr[1] & 0x02) >> 1;
- /* Actually cut back the stack. */
- write_register (SP_REGNUM, get_frame_base (frame));
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- /* Don't we need to set the PC?!? XXX FIXME. */
-}
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm8 = extract_signed_integer (&buf[1], 1, byte_order);
-/* Function: pop_frame
- This routine gets called when either the user uses the `return'
- command, or the call dummy breakpoint gets hit. */
-static void
-mn10300_pop_frame (void)
-{
- /* This function checks for and handles generic dummy frames, and
- calls back to our function for ordinary frames. */
- generic_pop_current_frame (mn10300_pop_frame_regular);
+ rN_regnum = translate_rreg (rN);
- /* Throw away any cached frame information. */
- flush_cached_frames ();
-}
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm8);
-/* Function: push_arguments
- Setup arguments for a call to the target. Arguments go in
- order on the stack. */
+ pc += 4;
+ }
+ /* fmov fsM, (rN+, imm24) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm24;
+ gdb_byte buf[4];
-static CORE_ADDR
-mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
-{
- int argnum = 0;
- int len = 0;
- int stack_offset = 0;
- int regsused = struct_return ? 1 : 0;
+ Y = (instr[1] & 0x02) >> 1;
- /* This should be a nop, but align the stack just in case something
- went wrong. Stacks are four byte aligned on the mn10300. */
- sp &= ~3;
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- /* Now make space on the stack for the args.
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm24 = extract_signed_integer (&buf[1], 3, byte_order);
- XXX This doesn't appear to handle pass-by-invisible reference
- arguments. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm24);
- while (regsused < 2 && arg_length > 0)
+ pc += 6;
+ }
+ /* fmov fsM, (rN+, imm32) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x31)
{
- regsused++;
- arg_length -= 4;
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm32 = extract_signed_integer (&buf[1], 4, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm32);
+
+ pc += 7;
}
- len += arg_length;
- }
+ /* mov imm8, aN */
+ else if ((instr[0] & 0xf0) == 0x90)
+ {
+ int aN = instr[0] & 0x03;
+ LONGEST imm8;
- /* Allocate stack space. */
- sp -= len;
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
- regsused = struct_return ? 1 : 0;
- /* Push all arguments onto the stack. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int len;
- char *val;
+ regs[E_A0_REGNUM + aN] = pv_constant (imm8);
+ pc += 2;
+ }
+ /* mov imm16, aN */
+ else if ((instr[0] & 0xfc) == 0x24)
+ {
+ int aN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
- /* XXX Check this. What about UNIONS? */
- if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
- && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
- {
- /* XXX Wrong, we want a pointer to this argument. */
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *) VALUE_CONTENTS (*args);
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm16);
+ pc += 3;
}
- else
- {
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *) VALUE_CONTENTS (*args);
+ /* mov imm32, aN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xdc))
+ {
+ int aN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm32);
+ pc += 6;
}
+ /* mov imm8, dN */
+ else if ((instr[0] & 0xf0) == 0x80)
+ {
+ int dN = instr[0] & 0x03;
+ LONGEST imm8;
- while (regsused < 2 && len > 0)
- {
- write_register (regsused, extract_unsigned_integer (val, 4));
- val += 4;
- len -= 4;
- regsused++;
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
+
+ regs[E_D0_REGNUM + dN] = pv_constant (imm8);
+ pc += 2;
}
+ /* mov imm16, dN */
+ else if ((instr[0] & 0xfc) == 0x2c)
+ {
+ int dN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
- while (len > 0)
- {
- write_memory (sp + stack_offset, val, 4);
- len -= 4;
- val += 4;
- stack_offset += 4;
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm16);
+ pc += 3;
}
+ /* mov imm32, dN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xcc))
+ {
+ int dN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
- args++;
- }
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- /* Make space for the flushback area. */
- sp -= 8;
- return sp;
-}
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm32);
+ pc += 6;
+ }
+ else
+ {
+ /* We've hit some instruction that we don't recognize. Hopefully,
+ we have enough to do prologue analysis. */
+ break;
+ }
+ }
-/* Function: push_return_address (pc)
- Set up the return address for the inferior function call.
- Needed for targets where we don't actually execute a JSR/BSR instruction */
+ /* Is the frame size (offset, really) a known constant? */
+ if (pv_is_register (regs[E_SP_REGNUM], E_SP_REGNUM))
+ result->frame_size = regs[E_SP_REGNUM].k;
-static CORE_ADDR
-mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
-{
- unsigned char buf[4];
+ /* Was the frame pointer initialized? */
+ if (pv_is_register (regs[E_A3_REGNUM], E_SP_REGNUM))
+ {
+ result->has_frame_ptr = 1;
+ result->frame_ptr_offset = regs[E_A3_REGNUM].k;
+ }
- store_unsigned_integer (buf, 4, entry_point_address ());
- write_memory (sp - 4, buf, 4);
- return sp - 4;
-}
+ /* Record where all the registers were saved. */
+ pv_area_scan (stack, check_for_saved, (void *) result);
-/* Function: store_struct_return (addr,sp)
- Store the structure value return address for an inferior function
- call. */
+ result->prologue_end = after_last_frame_setup_insn;
-static void
-mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- /* The structure return address is passed as the first argument. */
- write_register (0, addr);
+ do_cleanups (back_to);
}
-/* Function: frame_saved_pc
- Find the caller of this frame. We do this by seeing if RP_REGNUM
- is saved in the stack anywhere, otherwise we get it from the
- registers. If the inner frame is a dummy frame, return its PC
- instead of RP, because that's where "caller" of the dummy-frame
- will be found. */
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
static CORE_ADDR
-mn10300_frame_saved_pc (struct frame_info *fi)
+mn10300_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- int adjust = saved_regs_size (fi);
-
- return (read_memory_integer (get_frame_base (fi) + adjust,
- DEPRECATED_REGISTER_SIZE));
-}
-
-/* Function: mn10300_init_extra_frame_info
- Setup the frame's frame pointer, pc, and frame addresses for saved
- registers. Most of the work is done in mn10300_analyze_prologue().
+ const char *name;
+ CORE_ADDR func_addr, func_end;
+ struct mn10300_prologue p;
- Note that when we are called for the last frame (currently active frame),
- that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will
- be valid only if this routine uses FP. For previous frames, fi-frame will
- always be correct. mn10300_analyze_prologue will fix fi->frame if
- it's not valid.
+ /* Try to find the extent of the function that contains PC. */
+ if (!find_pc_partial_function (pc, &name, &func_addr, &func_end))
+ return pc;
- We can be called with the PC in the call dummy under two
- circumstances. First, during normal backtracing, second, while
- figuring out the frame pointer just prior to calling the target
- function (see call_function_by_hand). */
+ mn10300_analyze_prologue (gdbarch, pc, func_end, &p);
+ return p.prologue_end;
+}
-static void
-mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+/* Wrapper for mn10300_analyze_prologue: find the function start;
+ use the current frame PC as the limit, then
+ invoke mn10300_analyze_prologue and return its result. */
+static struct mn10300_prologue *
+mn10300_analyze_frame_prologue (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- if (get_next_frame (fi))
- deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));
+ if (!*this_prologue_cache)
+ {
+ CORE_ADDR func_start, stop_addr;
- frame_saved_regs_zalloc (fi);
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
+ *this_prologue_cache = FRAME_OBSTACK_ZALLOC (struct mn10300_prologue);
- get_frame_extra_info (fi)->status = 0;
- get_frame_extra_info (fi)->stack_size = 0;
+ func_start = get_frame_func (this_frame);
+ stop_addr = get_frame_pc (this_frame);
- mn10300_analyze_prologue (fi, 0);
-}
+ /* If we couldn't find any function containing the PC, then
+ just initialize the prologue cache, but don't do anything. */
+ if (!func_start)
+ stop_addr = func_start;
+ mn10300_analyze_prologue (get_frame_arch (this_frame),
+ func_start, stop_addr, *this_prologue_cache);
+ }
-/* This function's job is handled by init_extra_frame_info. */
-static void
-mn10300_frame_init_saved_regs (struct frame_info *frame)
-{
+ return *this_prologue_cache;
}
-
-/* Function: mn10300_virtual_frame_pointer
- Return the register that the function uses for a frame pointer,
- plus any necessary offset to be applied to the register before
- any frame pointer offsets. */
-
-static void
-mn10300_virtual_frame_pointer (CORE_ADDR pc,
- int *reg,
- LONGEST *offset)
+/* Given the next frame and a prologue cache, return this frame's
+ base. */
+static CORE_ADDR
+mn10300_frame_base (struct frame_info *this_frame, void **this_prologue_cache)
{
- struct frame_info *dummy = analyze_dummy_frame (pc, 0);
- /* Set up a dummy frame_info, Analyze the prolog and fill in the
- extra info. */
- /* Results will tell us which type of frame it uses. */
- if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP)
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+
+ /* In functions that use alloca, the distance between the stack
+ pointer and the frame base varies dynamically, so we can't use
+ the SP plus static information like prologue analysis to find the
+ frame base. However, such functions must have a frame pointer,
+ to be able to restore the SP on exit. So whenever we do have a
+ frame pointer, use that to find the base. */
+ if (p->has_frame_ptr)
{
- *reg = SP_REGNUM;
- *offset = -(get_frame_extra_info (dummy)->stack_size);
+ CORE_ADDR fp = get_frame_register_unsigned (this_frame, E_A3_REGNUM);
+ return fp - p->frame_ptr_offset;
}
else
{
- *reg = A3_REGNUM;
- *offset = 0;
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ return sp - p->frame_size;
}
}
-static int
-mn10300_reg_struct_has_addr (int gcc_p, struct type *type)
+/* Here is a dummy implementation. */
+static struct frame_id
+mn10300_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- return (TYPE_LENGTH (type) > 8);
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ CORE_ADDR pc = get_frame_register_unsigned (this_frame, E_PC_REGNUM);
+ return frame_id_build (sp, pc);
}
-static struct type *
-mn10300_register_virtual_type (int reg)
+static void
+mn10300_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- return builtin_type_int;
-}
+ *this_id = frame_id_build (mn10300_frame_base (this_frame,
+ this_prologue_cache),
+ get_frame_func (this_frame));
-static int
-mn10300_register_byte (int reg)
-{
- return (reg * 4);
}
-static int
-mn10300_register_virtual_size (int reg)
+static struct value *
+mn10300_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
- return 4;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame));
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+ CORE_ADDR frame_base = mn10300_frame_base (this_frame, this_prologue_cache);
+ int reg_size = register_size (get_frame_arch (this_frame), regnum);
+
+ if (regnum == E_SP_REGNUM)
+ return frame_unwind_got_constant (this_frame, regnum, frame_base);
+
+ /* If prologue analysis says we saved this register somewhere,
+ return a description of the stack slot holding it. */
+ if (p->reg_offset[regnum] != 1)
+ return frame_unwind_got_memory (this_frame, regnum,
+ frame_base + p->reg_offset[regnum]);
+
+ /* Otherwise, presume we haven't changed the value of this
+ register, and get it from the next frame. */
+ return frame_unwind_got_register (this_frame, regnum, regnum);
}
-static int
-mn10300_register_raw_size (int reg)
+static const struct frame_unwind mn10300_frame_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ mn10300_frame_this_id,
+ mn10300_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+static CORE_ADDR
+mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- return 4;
+ ULONGEST pc;
+
+ pc = frame_unwind_register_unsigned (this_frame, E_PC_REGNUM);
+ return pc;
}
-/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
- mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
- register number. Why don't Dwarf2 and GDB use the same numbering?
- Who knows? But since people have object files lying around with
- the existing Dwarf2 numbering, and other people have written stubs
- to work with the existing GDB, neither of them can change. So we
- just have to cope. */
-static int
-mn10300_dwarf2_reg_to_regnum (int dwarf2)
+static CORE_ADDR
+mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- /* This table is supposed to be shaped like the REGISTER_NAMES
- initializer in gcc/config/mn10300/mn10300.h. Registers which
- appear in GCC's numbering, but have no counterpart in GDB's
- world, are marked with a -1. */
- static int dwarf2_to_gdb[] = {
- 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
- 15, 16, 17, 18, 19, 20, 21, 22
- };
- int gdb;
+ ULONGEST sp;
- if (dwarf2 < 0
- || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0]))
- || dwarf2_to_gdb[dwarf2] == -1)
- internal_error (__FILE__, __LINE__,
- "bogus register number in debug info: %d", dwarf2);
-
- return dwarf2_to_gdb[dwarf2];
+ sp = frame_unwind_register_unsigned (this_frame, E_SP_REGNUM);
+ return sp;
}
static void
-mn10300_print_register (const char *name, int regnum, int reg_width)
+mn10300_frame_unwind_init (struct gdbarch *gdbarch)
{
- char raw_buffer[MAX_REGISTER_SIZE];
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &mn10300_frame_unwind);
+ set_gdbarch_dummy_id (gdbarch, mn10300_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
+}
- if (reg_width)
- printf_filtered ("%*s: ", reg_width, name);
- else
- printf_filtered ("%s: ", name);
+/* Function: push_dummy_call
+ *
+ * Set up machine state for a target call, including
+ * function arguments, stack, return address, etc.
+ *
+ */
+
+static CORE_ADDR
+mn10300_push_dummy_call (struct gdbarch *gdbarch,
+ struct value *target_func,
+ struct regcache *regcache,
+ CORE_ADDR bp_addr,
+ int nargs, struct value **args,
+ CORE_ADDR sp,
+ int struct_return,
+ CORE_ADDR struct_addr)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ const int push_size = register_size (gdbarch, E_PC_REGNUM);
+ int regs_used;
+ int len, arg_len;
+ int stack_offset = 0;
+ int argnum;
+ char *val, valbuf[MAX_REGISTER_SIZE];
- /* Get the data */
- if (!frame_register_read (deprecated_selected_frame, regnum, raw_buffer))
+ /* This should be a nop, but align the stack just in case something
+ went wrong. Stacks are four byte aligned on the mn10300. */
+ sp &= ~3;
+
+ /* Now make space on the stack for the args.
+
+ XXX This doesn't appear to handle pass-by-invisible reference
+ arguments. */
+ regs_used = struct_return ? 1 : 0;
+ for (len = 0, argnum = 0; argnum < nargs; argnum++)
+ {
+ arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
+ while (regs_used < 2 && arg_len > 0)
+ {
+ regs_used++;
+ arg_len -= push_size;
+ }
+ len += arg_len;
+ }
+
+ /* Allocate stack space. */
+ sp -= len;
+
+ if (struct_return)
{
- printf_filtered ("[invalid]");
- return;
+ regs_used = 1;
+ regcache_cooked_write_unsigned (regcache, E_D0_REGNUM, struct_addr);
}
else
+ regs_used = 0;
+
+ /* Push all arguments onto the stack. */
+ for (argnum = 0; argnum < nargs; argnum++)
{
- int byte;
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ /* FIXME what about structs? Unions? */
+ if (TYPE_CODE (value_type (*args)) == TYPE_CODE_STRUCT
+ && TYPE_LENGTH (value_type (*args)) > 8)
{
- for (byte = REGISTER_RAW_SIZE (regnum) - DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum);
- byte < REGISTER_RAW_SIZE (regnum);
- byte++)
- printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
+ /* Change to pointer-to-type. */
+ arg_len = push_size;
+ store_unsigned_integer (valbuf, push_size, byte_order,
+ value_address (*args));
+ val = &valbuf[0];
}
else
{
- for (byte = DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum) - 1;
- byte >= 0;
- byte--)
- printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
+ arg_len = TYPE_LENGTH (value_type (*args));
+ val = (char *) value_contents (*args);
}
- }
-}
-static void
-mn10300_do_registers_info (int regnum, int fpregs)
-{
- if (regnum >= 0)
- {
- const char *name = REGISTER_NAME (regnum);
- if (name == NULL || name[0] == '\0')
- error ("Not a valid register for the current processor type");
- mn10300_print_register (name, regnum, 0);
- printf_filtered ("\n");
- }
- else
- {
- /* print registers in an array 4x8 */
- int r;
- int reg;
- const int nr_in_row = 4;
- const int reg_width = 4;
- for (r = 0; r < NUM_REGS; r += nr_in_row)
+ while (regs_used < 2 && arg_len > 0)
{
- int c;
- int printing = 0;
- int padding = 0;
- for (c = r; c < r + nr_in_row; c++)
- {
- const char *name = REGISTER_NAME (c);
- if (name != NULL && *name != '\0')
- {
- printing = 1;
- while (padding > 0)
- {
- printf_filtered (" ");
- padding--;
- }
- mn10300_print_register (name, c, reg_width);
- printf_filtered (" ");
- }
- else
- {
- padding += (reg_width + 2 + 8 + 1);
- }
- }
- if (printing)
- printf_filtered ("\n");
+ regcache_cooked_write_unsigned (regcache, regs_used,
+ extract_unsigned_integer (val, push_size, byte_order));
+ val += push_size;
+ arg_len -= push_size;
+ regs_used++;
}
+
+ while (arg_len > 0)
+ {
+ write_memory (sp + stack_offset, val, push_size);
+ arg_len -= push_size;
+ val += push_size;
+ stack_offset += push_size;
+ }
+
+ args++;
}
+
+ /* Make space for the flushback area. */
+ sp -= 8;
+
+ /* Push the return address that contains the magic breakpoint. */
+ sp -= 4;
+ write_memory_unsigned_integer (sp, push_size, byte_order, bp_addr);
+
+ /* The CPU also writes the return address always into the
+ MDR register on "call". */
+ regcache_cooked_write_unsigned (regcache, E_MDR_REGNUM, bp_addr);
+
+ /* Update $sp. */
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
+
+ /* On the mn10300, it's possible to move some of the stack adjustment
+ and saving of the caller-save registers out of the prologue and
+ into the call sites. (When using gcc, this optimization can
+ occur when using the -mrelax switch.) If this occurs, the dwarf2
+ info will reflect this fact. We can test to see if this is the
+ case by creating a new frame using the current stack pointer and
+ the address of the function that we're about to call. We then
+ unwind SP and see if it's different than the SP of our newly
+ created frame. If the SP values are the same, the caller is not
+ expected to allocate any additional stack. On the other hand, if
+ the SP values are different, the difference determines the
+ additional stack that must be allocated.
+
+ Note that we don't update the return value though because that's
+ the value of the stack just after pushing the arguments, but prior
+ to performing the call. This value is needed in order to
+ construct the frame ID of the dummy call. */
+ {
+ CORE_ADDR func_addr = find_function_addr (target_func, NULL);
+ CORE_ADDR unwound_sp
+ = mn10300_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
+ if (sp != unwound_sp)
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
+ sp - (unwound_sp - sp));
+ }
+
+ return sp;
}
-static CORE_ADDR
-mn10300_read_fp (void)
+/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
+ mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
+ register number. Why don't Dwarf2 and GDB use the same numbering?
+ Who knows? But since people have object files lying around with
+ the existing Dwarf2 numbering, and other people have written stubs
+ to work with the existing GDB, neither of them can change. So we
+ just have to cope. */
+static int
+mn10300_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2)
{
- /* That's right, we're using the stack pointer as our frame pointer. */
- gdb_assert (SP_REGNUM >= 0);
- return read_register (SP_REGNUM);
-}
+ /* This table is supposed to be shaped like the gdbarch_register_name
+ initializer in gcc/config/mn10300/mn10300.h. Registers which
+ appear in GCC's numbering, but have no counterpart in GDB's
+ world, are marked with a -1. */
+ static int dwarf2_to_gdb[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
+ 15, 16, 17, 18, 19, 20, 21, 22,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ 9, 11
+ };
-/* Dump out the mn10300 speciic architecture information. */
+ if (dwarf2 < 0
+ || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
+ {
+ warning (_("Bogus register number in debug info: %d"), dwarf2);
+ return -1;
+ }
-static void
-mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
- tdep->am33_mode);
+ return dwarf2_to_gdb[dwarf2];
}
static struct gdbarch *
mn10300_gdbarch_init (struct gdbarch_info info,
struct gdbarch_list *arches)
{
- static LONGEST mn10300_call_dummy_words[] = { 0 };
struct gdbarch *gdbarch;
- struct gdbarch_tdep *tdep = NULL;
- int am33_mode;
- gdbarch_register_name_ftype *register_name;
- int mach;
+ struct gdbarch_tdep *tdep;
int num_regs;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
+
tdep = xmalloc (sizeof (struct gdbarch_tdep));
gdbarch = gdbarch_alloc (&info, tdep);
- if (info.bfd_arch_info != NULL
- && info.bfd_arch_info->arch == bfd_arch_mn10300)
- mach = info.bfd_arch_info->mach;
- else
- mach = 0;
- switch (mach)
+ switch (info.bfd_arch_info->mach)
{
case 0:
case bfd_mach_mn10300:
- am33_mode = 0;
- register_name = mn10300_generic_register_name;
+ set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
+ tdep->am33_mode = 0;
num_regs = 32;
break;
case bfd_mach_am33:
- am33_mode = 1;
- register_name = am33_register_name;
+ set_gdbarch_register_name (gdbarch, am33_register_name);
+ tdep->am33_mode = 1;
num_regs = 32;
break;
+ case bfd_mach_am33_2:
+ set_gdbarch_register_name (gdbarch, am33_2_register_name);
+ tdep->am33_mode = 2;
+ num_regs = 64;
+ set_gdbarch_fp0_regnum (gdbarch, 32);
+ break;
default:
internal_error (__FILE__, __LINE__,
- "mn10300_gdbarch_init: Unknown mn10300 variant");
- return NULL; /* keep GCC happy. */
+ _("mn10300_gdbarch_init: Unknown mn10300 variant"));
+ break;
}
+ /* By default, chars are unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
+
/* Registers. */
set_gdbarch_num_regs (gdbarch, num_regs);
- set_gdbarch_register_name (gdbarch, register_name);
- set_gdbarch_deprecated_register_size (gdbarch, 4);
- set_gdbarch_deprecated_register_bytes (gdbarch, num_regs * gdbarch_deprecated_register_size (gdbarch));
- set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4);
- set_gdbarch_deprecated_register_raw_size (gdbarch, mn10300_register_raw_size);
- set_gdbarch_deprecated_register_byte (gdbarch, mn10300_register_byte);
- set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 4);
- set_gdbarch_deprecated_register_virtual_size (gdbarch, mn10300_register_virtual_size);
- set_gdbarch_deprecated_register_virtual_type (gdbarch, mn10300_register_virtual_type);
+ set_gdbarch_register_type (gdbarch, mn10300_register_type);
+ set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
+ set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
+ set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
- set_gdbarch_deprecated_do_registers_info (gdbarch, mn10300_do_registers_info);
- set_gdbarch_sp_regnum (gdbarch, 8);
- set_gdbarch_pc_regnum (gdbarch, 9);
- set_gdbarch_deprecated_fp_regnum (gdbarch, 31);
- set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer);
+ /* Stack unwinding. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
/* Breakpoints. */
set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_decr_pc_after_break (gdbarch, 0);
+ /* decr_pc_after_break? */
+ /* Disassembly. */
+ set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
- /* Stack unwinding. */
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_deprecated_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs);
- set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain);
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc);
- set_gdbarch_deprecated_extract_return_value (gdbarch, mn10300_extract_return_value);
- set_gdbarch_deprecated_extract_struct_value_address
- (gdbarch, mn10300_extract_struct_value_address);
- set_gdbarch_deprecated_store_return_value (gdbarch, mn10300_store_return_value);
- set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return);
- set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame);
- set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- /* That's right, we're using the stack pointer as our frame pointer. */
- set_gdbarch_deprecated_target_read_fp (gdbarch, mn10300_read_fp);
-
- /* Calling functions in the inferior from GDB. */
- set_gdbarch_deprecated_call_dummy_words (gdbarch, mn10300_call_dummy_words);
- set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (mn10300_call_dummy_words));
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
- set_gdbarch_deprecated_push_arguments (gdbarch, mn10300_push_arguments);
- set_gdbarch_deprecated_reg_struct_has_addr
- (gdbarch, mn10300_reg_struct_has_addr);
- set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address);
- set_gdbarch_deprecated_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_use_struct_convention (gdbarch, mn10300_use_struct_convention);
-
- tdep->am33_mode = am33_mode;
-
- /* Should be using push_dummy_call. */
- set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
+ /* Stage 2 */
+ set_gdbarch_return_value (gdbarch, mn10300_return_value);
+
+ /* Stage 3 -- get target calls working. */
+ set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
+ /* set_gdbarch_return_value (store, extract) */
- set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
+
+ mn10300_frame_unwind_init (gdbarch);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
return gdbarch;
}
+/* Dump out the mn10300 specific architecture information. */
+
+static void
+mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
+ tdep->am33_mode);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_mn10300_tdep;
+
void
_initialize_mn10300_tdep (void)
{
-/* printf("_initialize_mn10300_tdep\n"); */
-
- register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init);
+ gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
}
+