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* mips-tdep.c (mips32_in_function_epilogue_p): New function.

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(mips16_in_function_epilogue_p): Likewise.
(mips_in_function_epilogue_p): Likewise.
(mips_gdbarch_init): Register mips_in_function_epilogue_p().
This commit is contained in:
Maciej W. Rozycki 2007-09-20 15:34:19 +00:00
parent 217fe99f7d
commit 97ab0fdd9d
2 changed files with 98 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2007-09-20 Maciej W. Rozycki <macro@mips.com>
* mips-tdep.c (mips32_in_function_epilogue_p): New function.
(mips16_in_function_epilogue_p): Likewise.
(mips_in_function_epilogue_p): Likewise.
(mips_gdbarch_init): Register mips_in_function_epilogue_p().
2007-09-19 Joel Brobecker <brobecker@adacore.com>
* configure.ac: Add check for "etext".

91
gdb/mips-tdep.c
View File

@ -4404,6 +4404,95 @@ mips_skip_prologue (CORE_ADDR pc)
return mips32_scan_prologue (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. */
static int
mips32_in_function_epilogue_p (CORE_ADDR pc)
{
CORE_ADDR func_addr = 0, func_end = 0;
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
{
/* The MIPS epilogue is max. 12 bytes long. */
CORE_ADDR addr = func_end - 12;
if (addr < func_addr + 4)
addr = func_addr + 4;
if (pc < addr)
return 0;
for (; pc < func_end; pc += MIPS_INSN32_SIZE)
{
unsigned long high_word;
unsigned long inst;
inst = mips_fetch_instruction (pc);
high_word = (inst >> 16) & 0xffff;
if (high_word != 0x27bd /* addiu $sp,$sp,offset */
&& high_word != 0x67bd /* daddiu $sp,$sp,offset */
&& inst != 0x03e00008 /* jr $ra */
&& inst != 0x00000000) /* nop */
return 0;
}
return 1;
}
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. */
static int
mips16_in_function_epilogue_p (CORE_ADDR pc)
{
CORE_ADDR func_addr = 0, func_end = 0;
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
{
/* The MIPS epilogue is max. 12 bytes long. */
CORE_ADDR addr = func_end - 12;
if (addr < func_addr + 4)
addr = func_addr + 4;
if (pc < addr)
return 0;
for (; pc < func_end; pc += MIPS_INSN16_SIZE)
{
unsigned short inst;
inst = mips_fetch_instruction (pc);
if ((inst & 0xf800) == 0xf000) /* extend */
continue;
if (inst != 0x6300 /* addiu $sp,offset */
&& inst != 0xfb00 /* daddiu $sp,$sp,offset */
&& inst != 0xe820 /* jr $ra */
&& inst != 0xe8a0 /* jrc $ra */
&& inst != 0x6500) /* nop */
return 0;
}
return 1;
}
return 0;
}
/* 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)
{
if (mips_pc_is_mips16 (pc))
return mips16_in_function_epilogue_p (pc);
else
return mips32_in_function_epilogue_p (pc);
}
/* Root of all "set mips "/"show mips " commands. This will eventually be
used for all MIPS-specific commands. */
@ -5485,6 +5574,8 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_skip_prologue (gdbarch, mips_skip_prologue);
set_gdbarch_in_function_epilogue_p (gdbarch, mips_in_function_epilogue_p);
set_gdbarch_pointer_to_address (gdbarch, signed_pointer_to_address);
set_gdbarch_address_to_pointer (gdbarch, address_to_signed_pointer);
set_gdbarch_integer_to_address (gdbarch, mips_integer_to_address);