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Decode prefixes on i386-based architectures

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This commit is contained in:
Pierre Pronchery 2018-09-08 20:08:26 +02:00
parent 4e14c80f0c
commit baa8f5412c
1 changed files with 10 additions and 0 deletions
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10
src/arch/i386.h
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@ -91,6 +91,7 @@ static int _decode_register(AsmArchPlugin * plugin,
static int _i386_decode(AsmArchPlugin * plugin, AsmArchInstructionCall * call)
{
AsmArchPluginHelper * helper = plugin->helper;
AsmArchPrefix const * ap = NULL;
AsmArchInstruction const * ai = NULL;
unsigned int opcode;
uint8_t u8;
@ -101,6 +102,13 @@ static int _i386_decode(AsmArchPlugin * plugin, AsmArchInstructionCall * call)
if(helper->read(helper->arch, &u8, sizeof(u8)) != sizeof(u8))
return -1;
opcode = u8;
if((ap = helper->get_prefix_by_opcode(helper->arch, 8, opcode))
!= NULL)
{
if(helper->read(helper->arch, &u8, sizeof(u8)) != sizeof(u8))
return -1;
opcode = u8;
}
if((ai = helper->get_instruction_by_opcode(helper->arch, 8, opcode))
== NULL)
{
@ -116,6 +124,8 @@ static int _i386_decode(AsmArchPlugin * plugin, AsmArchInstructionCall * call)
}
}
}
/* FIXME ignore prefixes when opcodes are not recognized */
call->prefix = (ap != NULL) ? ap->name : NULL;
if(ai == NULL)
{
/* no opcode was recognized */