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Slightly improved i386 instruction decoding

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This commit is contained in:
Pierre Pronchery 2011-04-25 01:02:27 +00:00
parent 69dd017c53
commit 98faecff40
1 changed files with 85 additions and 5 deletions
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90
src/arch/i386.h
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@ -34,6 +34,8 @@ static int _decode_dregister(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i);
static int _decode_immediate(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i);
static int _decode_modrm(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i);
static int _decode_operand(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i);
static int _decode_register(ArchPlugin * plugin, ArchInstructionCall * call,
@ -97,6 +99,9 @@ static int _decode_dregister(ArchPlugin * plugin, ArchInstructionCall * call,
ArchRegister * ar;
uint8_t id;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
/* FIXME check the size */
if(helper->read(helper->arch, &id, sizeof(id)) != sizeof(id))
return -1;
@ -112,27 +117,99 @@ static int _decode_immediate(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i)
{
ArchPluginHelper * helper = plugin->helper;
ArchOperandDefinition aod = call->operands[i].type;
ArchOperand * ao = &call->operands[i];
uint8_t u8;
uint16_t u16;
uint32_t u32;
/* FIXME implement more sizes */
switch(AO_GET_SIZE(aod) >> 3)
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s() size=%u\n", __func__,
AO_GET_SIZE(ao->type) >> 3);
#endif
switch(AO_GET_SIZE(ao->type) >> 3)
{
case sizeof(u8):
if(helper->read(helper->arch, &u8, sizeof(u8))
!= sizeof(u8))
return -1;
ao->value.immediate.value = u8;
break;
case sizeof(u16):
if(helper->read(helper->arch, &u16, sizeof(u16))
!= sizeof(u16))
return -1;
ao->value.immediate.value = _htol16(u16);
break;
case sizeof(u32):
if(helper->read(helper->arch, &u32, sizeof(u32))
!= sizeof(u32))
return -1;
ao->value.immediate.value = _htol32(u32);
break;
default:
return -error_set_code(1, "%s", strerror(ENOSYS));
}
call->operands[i].value.immediate.negative = 0;
return 0;
}
static int _decode_modrm(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i)
{
ArchPluginHelper * helper = plugin->helper;
ArchOperand * ao = &call->operands[i];
uint8_t u8;
uint32_t uW; /* XXX should be uintW_t */
ArchRegister * ar;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
if(helper->read(helper->arch, &u8, sizeof(u8)) != sizeof(u8))
return -1;
call->operands[i].value.immediate.value = u8;
call->operands[i].value.immediate.negative = 0;
if((u8 & 0xc0) == 0xc0)
{
if((ar = helper->get_register_by_id_size(helper->arch,
(u8 & 0x38) >> 3, W)) == NULL)
return -1;
ao->type = AO_REGISTER(0, 32, 0);
ao->value._register.name = ar->name;
}
else if((u8 & 0xc0) == 0x80)
{
if((ar = helper->get_register_by_id_size(helper->arch,
(u8 & 0x38) >> 3, W)) == NULL)
return -1;
if(helper->read(helper->arch, &uW, sizeof(uW)) != sizeof(uW))
return -1;
ao->type = AO_DREGISTER(0, W, W, 0);
ao->value.dregister.name = ar->name;
ao->value.dregister.offset = _htol32(uW); /* XXX _htolW() */
}
else if((u8 & 0xc0) == 0x40)
{
if((ar = helper->get_register_by_id_size(helper->arch,
(u8 & 0x38) >> 3, W)) == NULL)
return -1;
ao->type = AO_DREGISTER(0, 8, W, 0);
ao->value.dregister.name = ar->name;
}
else if((u8 & 0xc0) == 0x00)
{
if((ar = helper->get_register_by_id_size(helper->arch,
(u8 & 0x38) >> 3, W)) == NULL)
return -1;
ao->type = AO_DREGISTER(0, 0, W, 0);
ao->value.dregister.name = ar->name;
}
return 0;
}
static int _decode_operand(ArchPlugin * plugin, ArchInstructionCall * call,
size_t i)
{
if(AO_GET_FLAGS(call->operands[i].type) & AOF_I386_MODRM)
return _decode_modrm(plugin, call, i);
switch(AO_GET_TYPE(call->operands[i].type))
{
/* FIXME implement the rest */
@ -154,6 +231,9 @@ static int _decode_register(ArchPlugin * plugin, ArchInstructionCall * call,
ArchRegister * ar;
uint8_t id;
#ifdef DEBUG
fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
if(AO_GET_FLAGS(aod) & AOF_IMPLICIT)
{
if((ar = helper->get_register_by_id_size(helper->arch,