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dbghelp: Add support for jump instructions in function epilogs on x86_64.

This commit is contained in:
Alexandre Julliard 2012-03-16 13:15:38 +01:00
parent 58fe32e1ea
commit 0a7827b8b2
1 changed files with 34 additions and 13 deletions
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47
dlls/dbghelp/cpu_x86_64.c
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@ -290,9 +290,11 @@ static int get_opcode_size(UNWIND_CODE op)
}
}
static BOOL is_inside_epilog(struct cpu_stack_walk* csw, DWORD64 pc)
static BOOL is_inside_epilog(struct cpu_stack_walk* csw, DWORD64 pc,
DWORD64 base, const RUNTIME_FUNCTION *function )
{
BYTE op0, op1, op2;
BYTE op0, op1, op2;
LONG val32;
if (!sw_read_mem(csw, pc, &op0, 1)) return FALSE;
@ -338,12 +340,9 @@ static BOOL is_inside_epilog(struct cpu_stack_walk* csw, DWORD64 pc)
/* now check for various pop instructions */
for (;;)
{
BYTE rex = 0;
if (!sw_read_mem(csw, pc, &op0, 1)) return FALSE;
if ((op0 & 0xf0) == 0x40)
if ((op0 & 0xf0) == 0x40) /* rex prefix */
{
rex = op0 & 0x0f; /* rex prefix */
if (!sw_read_mem(csw, ++pc, &op0, 1)) return FALSE;
}
@ -362,7 +361,21 @@ static BOOL is_inside_epilog(struct cpu_stack_walk* csw, DWORD64 pc)
case 0xc2: /* ret $nn */
case 0xc3: /* ret */
return TRUE;
/* FIXME: add various jump instructions */
case 0xe9: /* jmp nnnn */
if (!sw_read_mem(csw, pc + 1, &val32, sizeof(LONG))) return FALSE;
pc += 5 + val32;
if (pc - base >= function->BeginAddress && pc - base < function->EndAddress)
continue;
break;
case 0xeb: /* jmp n */
if (!sw_read_mem(csw, pc + 1, &op1, 1)) return FALSE;
pc += 2 + (signed char)op1;
if (pc - base >= function->BeginAddress && pc - base < function->EndAddress)
continue;
break;
case 0xf3: /* rep; ret (for amd64 prediction bug) */
if (!sw_read_mem(csw, pc + 1, &op1, 1)) return FALSE;
return op1 == 0xc3;
}
return FALSE;
}
@ -402,8 +415,8 @@ static BOOL interpret_epilog(struct cpu_stack_walk* csw, ULONG64 pc, CONTEXT *co
pc++;
continue;
case 0x81: /* add $nnnn,%rsp */
if (!sw_read_mem(csw, pc + 2, &val32, sizeof(ULONG))) return FALSE;
context->Rsp += (LONG)val32;
if (!sw_read_mem(csw, pc + 2, &val32, sizeof(LONG))) return FALSE;
context->Rsp += val32;
pc += 2 + sizeof(LONG);
continue;
case 0x83: /* add $n,%rsp */
@ -421,8 +434,8 @@ static BOOL interpret_epilog(struct cpu_stack_walk* csw, ULONG64 pc, CONTEXT *co
}
else /* lea nnnn(reg),%rsp */
{
if (!sw_read_mem(csw, pc + 2, &val32, sizeof(ULONG))) return FALSE;
context->Rsp = get_int_reg( context, (insn & 7) + (rex & 1) * 8 ) + (LONG)val32;
if (!sw_read_mem(csw, pc + 2, &val32, sizeof(LONG))) return FALSE;
context->Rsp = get_int_reg( context, (insn & 7) + (rex & 1) * 8 ) + val32;
pc += 2 + sizeof(LONG);
}
continue;
@ -433,11 +446,19 @@ static BOOL interpret_epilog(struct cpu_stack_walk* csw, ULONG64 pc, CONTEXT *co
context->Rsp += sizeof(ULONG64) + val16;
return TRUE;
case 0xc3: /* ret */
case 0xf3: /* rep; ret */
if (!sw_read_mem(csw, context->Rsp, &val64, sizeof(DWORD64))) return FALSE;
context->Rip = val64;
context->Rsp += sizeof(ULONG64);
return TRUE;
/* FIXME: add various jump instructions */
case 0xe9: /* jmp nnnn */
if (!sw_read_mem(csw, pc + 1, &val32, sizeof(LONG))) return FALSE;
pc += 5 + val32;
continue;
case 0xeb: /* jmp n */
if (!sw_read_mem(csw, pc + 1, &val8, sizeof(BYTE))) return FALSE;
pc += 2 + (signed char)val8;
continue;
}
FIXME("unsupported insn %x\n", insn);
return FALSE;
@ -497,7 +518,7 @@ static BOOL interpret_function_table_entry(struct cpu_stack_walk* csw,
else
{
prolog_offset = ~0;
if (is_inside_epilog(csw, context->Rip))
if (is_inside_epilog(csw, context->Rip, base, function))
{
interpret_epilog(csw, context->Rip, context);
return TRUE;