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gdbarch: add instruction predicate methods

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Add new methods to gdbarch for analyzing the instruction at a given address.
Implement those methods for i386 and amd64 architectures.

This is needed by "record btrace" to detect function calls in the
execution trace.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* amd64-tdep.c (amd64_classify_insn_at, amd64_insn_is_call)
	(amd64_insn_is_ret, amd64_insn_is_jump, amd64_jmp_p): New.
	(amd64_init_abi): Add insn_is_call, insn_is_ret, and insn_is_jump
	to gdbarch.
	* i386-tdep.c (i386_insn_is_call, i386_insn_is_ret)
	(i386_insn_is_jump, i386_jmp_p): New.
	(i386_gdbarch_init): Add insn_is_call, insn_is_ret, and
	insn_is_jump to gdbarch.
	* gdbarch.sh (insn_is_call, insn_is_ret, insn_is_jump): New.
	* gdbarch.h: Regenerated.
	* gdbarch.c: Regenerated.
	* arch-utils.h (default_insn_is_call, default_insn_is_ret)
	(default_insn_is_jump): New.
	* arch-utils.c (default_insn_is_call, default_insn_is_ret)
	(default_insn_is_jump): New.
This commit is contained in:
Markus Metzger
2013-03-22 15:56:56 +01:00
parent 864089d2f6
commit c2170eeffa
8 changed files with 262 additions and 0 deletions
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59
gdb/i386-tdep.c
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@ -530,6 +530,22 @@ i386_absolute_jmp_p (const gdb_byte *insn)
return 0;
}
/* Return non-zero if INSN is a jump, zero otherwise. */
static int
i386_jmp_p (const gdb_byte *insn)
{
/* jump short, relative. */
if (insn[0] == 0xeb)
return 1;
/* jump near, relative. */
if (insn[0] == 0xe9)
return 1;
return i386_absolute_jmp_p (insn);
}
static int
i386_absolute_call_p (const gdb_byte *insn)
{
@ -601,6 +617,45 @@ i386_syscall_p (const gdb_byte *insn, int *lengthp)
return 0;
}
/* The gdbarch insn_is_call method. */
static int
i386_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr)
{
gdb_byte buf[I386_MAX_INSN_LEN], *insn;
read_code (addr, buf, I386_MAX_INSN_LEN);
insn = i386_skip_prefixes (buf, I386_MAX_INSN_LEN);
return i386_call_p (insn);
}
/* The gdbarch insn_is_ret method. */
static int
i386_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr)
{
gdb_byte buf[I386_MAX_INSN_LEN], *insn;
read_code (addr, buf, I386_MAX_INSN_LEN);
insn = i386_skip_prefixes (buf, I386_MAX_INSN_LEN);
return i386_ret_p (insn);
}
/* The gdbarch insn_is_jump method. */
static int
i386_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
{
gdb_byte buf[I386_MAX_INSN_LEN], *insn;
read_code (addr, buf, I386_MAX_INSN_LEN);
insn = i386_skip_prefixes (buf, I386_MAX_INSN_LEN);
return i386_jmp_p (insn);
}
/* Some kernels may run one past a syscall insn, so we have to cope.
Otherwise this is just simple_displaced_step_copy_insn. */
@ -8017,6 +8072,10 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_gen_return_address (gdbarch, i386_gen_return_address);
set_gdbarch_insn_is_call (gdbarch, i386_insn_is_call);
set_gdbarch_insn_is_ret (gdbarch, i386_insn_is_ret);
set_gdbarch_insn_is_jump (gdbarch, i386_insn_is_jump);
/* Hook in ABI-specific overrides, if they have been registered. */
info.tdep_info = (void *) tdesc_data;
gdbarch_init_osabi (info, gdbarch);