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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "debug.h"
#include "x64trace.h"
#include "box64context.h"
#include "x64emu_private.h"
#ifdef HAVE_TRACE
#ifdef ZYDIS3
#include "x86zydis.h"
#else
#include <Zydis/Zydis.h>
#endif
/* We cannot use
#if ZYDIS_VERSION_MAJOR(ZYDIS_VERSION) == 4
... to check the version, as it's defineed with typecasts, for details, see: https://github.com/zyantific/zydis/pull/577
*/
#ifndef ZYDIS3 // Zydis 4.x
typedef ZyanStatus (*PFNZydisDecoderInit)(ZydisDecoder* decoder, ZydisMachineMode machine_mode, ZydisStackWidth stack_width);
typedef ZyanStatus (*PFNZydisFormatterInit)(ZydisFormatter* formatter, ZydisFormatterStyle style);
typedef ZyanStatus (*PFNZydisDecoderDecodeFull)(const ZydisDecoder* decoder, const void* buffer, ZyanUSize length, ZydisDecodedInstruction* instruction, ZydisDecodedOperand* operands);
typedef ZyanStatus (*PFNZydisFormatterFormatInstruction)(const ZydisFormatter* formatter, const ZydisDecodedInstruction* instruction, const ZydisDecodedOperand* operands, ZyanU8 operand_count, char* buffer, ZyanUSize length, ZyanU64 runtime_address, void* user_data);
typedef struct zydis_s {
void* lib;
PFNZydisDecoderInit ZydisDecoderInit;
PFNZydisFormatterInit ZydisFormatterInit;
PFNZydisDecoderDecodeFull ZydisDecoderDecodeFull;
PFNZydisFormatterFormatInstruction ZydisFormatterFormatInstruction;
} zydis_t;
typedef struct zydis_dec_s {
ZydisDecoder decoder;
ZydisFormatter formatter;
ZydisDecodedInstruction instruction;
ZydisDecodedOperand operands[ZYDIS_MAX_OPERAND_COUNT];
PFNZydisDecoderDecodeFull ZydisDecoderDecodeFull;
PFNZydisFormatterFormatInstruction ZydisFormatterFormatInstruction;
} zydis_dec_t;
#else
typedef ZyanStatus (*PFNZydisDecoderInit)(ZydisDecoder* decoder, ZydisMachineMode machine_mode, ZydisAddressWidth address_width);
typedef ZyanStatus (*PFNZydisFormatterInit)(ZydisFormatter* formatter, ZydisFormatterStyle style);
typedef ZyanStatus (*PFNZydisDecoderDecodeBuffer)(const ZydisDecoder* decoder, const void* buffer, ZyanUSize length, ZydisDecodedInstruction* instruction);
typedef ZyanStatus (*PFNZydisFormatterFormatInstruction)(const ZydisFormatter* formatter, const ZydisDecodedInstruction* instruction, char* buffer, ZyanUSize length, ZyanU64 runtime_address);
typedef struct zydis_s {
void* lib;
PFNZydisDecoderInit ZydisDecoderInit;
PFNZydisFormatterInit ZydisFormatterInit;
PFNZydisDecoderDecodeBuffer ZydisDecoderDecodeBuffer;
PFNZydisFormatterFormatInstruction ZydisFormatterFormatInstruction;
} zydis_t;
typedef struct zydis_dec_s {
ZydisDecoder decoder;
ZydisFormatter formatter;
ZydisDecodedInstruction instruction;
PFNZydisDecoderDecodeBuffer ZydisDecoderDecodeBuffer;
PFNZydisFormatterFormatInstruction ZydisFormatterFormatInstruction;
} zydis_dec_t;
#endif
#else
typedef struct zydis_s {
int dummy;
} zydis_t;
typedef struct zydis_dec_s {
int dummy;
} zydis_dec_t;
#endif
int InitX64Trace(box64context_t* context)
{
#ifndef HAVE_TRACE
return 1;
#else
if (context->zydis)
return 0;
context->zydis = (zydis_t*)box_calloc(1, sizeof(zydis_t));
if (!context->zydis)
return 1;
#ifndef ZYDIS3
context->zydis->lib = dlopen("libZydis.so.4", RTLD_LAZY);
#else
context->zydis->lib = dlopen("libZydis.so.3", RTLD_LAZY);
#endif
if(!context->zydis->lib)
context->zydis->lib = dlopen("libZydis.so", RTLD_LAZY);
if (!context->zydis->lib) {
printf_log(LOG_INFO, "Failed to open libZydis: %s\n", dlerror());
return 1;
}
#define GO(f) \
context->zydis->f = (PFN##f)dlsym(context->zydis->lib, #f); \
if (!context->zydis->f) { \
printf_log(LOG_INFO, "Fail to load Zydis function %s\n", #f); \
dlclose(context->zydis->lib); \
context->zydis->lib = NULL; \
return 1; \
}
GO(ZydisDecoderInit);
GO(ZydisFormatterInit);
#ifndef ZYDIS3
GO(ZydisDecoderDecodeFull);
#else
GO(ZydisDecoderDecodeBuffer);
#endif
GO(ZydisFormatterFormatInstruction);
#undef GO
context->dec = InitX64TraceDecoder(context);
context->dec32 = InitX86TraceDecoder(context);
return 0;
#endif
}
void DeleteX64Trace(box64context_t* context)
{
#ifdef HAVE_TRACE
if (!context->zydis)
return;
if (context->zydis->lib)
dlclose(context->zydis->lib);
box_free(context->zydis);
context->zydis = NULL;
#endif
}
zydis_dec_t* InitX86TraceDecoder(box64context_t* context)
{
#ifndef HAVE_TRACE
return NULL;
#else
if (!context->zydis)
return NULL;
zydis_dec_t* dec = (zydis_dec_t*)box_calloc(1, sizeof(zydis_dec_t));
#ifndef ZYDIS3
dec->ZydisDecoderDecodeFull = context->zydis->ZydisDecoderDecodeFull;
dec->ZydisFormatterFormatInstruction = context->zydis->ZydisFormatterFormatInstruction;
context->zydis->ZydisDecoderInit(&dec->decoder, ZYDIS_MACHINE_MODE_LEGACY_32, ZYDIS_STACK_WIDTH_32);
context->zydis->ZydisFormatterInit(&dec->formatter, ZYDIS_FORMATTER_STYLE_INTEL);
#else
dec->ZydisDecoderDecodeBuffer = context->zydis->ZydisDecoderDecodeBuffer;
dec->ZydisFormatterFormatInstruction = context->zydis->ZydisFormatterFormatInstruction;
context->zydis->ZydisDecoderInit(&dec->decoder, ZYDIS_MACHINE_MODE_LEGACY_32, ZYDIS_ADDRESS_WIDTH_32);
context->zydis->ZydisFormatterInit(&dec->formatter, ZYDIS_FORMATTER_STYLE_INTEL);
#endif
return dec;
#endif
}
void DeleteX86TraceDecoder(zydis_dec_t** dec)
{
#ifdef HAVE_TRACE
box_free(*dec);
*dec = NULL;
#endif
}
zydis_dec_t* InitX64TraceDecoder(box64context_t* context)
{
#ifndef HAVE_TRACE
return NULL;
#else
if (!context->zydis)
return NULL;
zydis_dec_t* dec = (zydis_dec_t*)box_calloc(1, sizeof(zydis_dec_t));
#ifndef ZYDIS3
dec->ZydisDecoderDecodeFull = context->zydis->ZydisDecoderDecodeFull;
dec->ZydisFormatterFormatInstruction = context->zydis->ZydisFormatterFormatInstruction;
context->zydis->ZydisDecoderInit(&dec->decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_STACK_WIDTH_64);
context->zydis->ZydisFormatterInit(&dec->formatter, ZYDIS_FORMATTER_STYLE_INTEL);
#else
dec->ZydisDecoderDecodeBuffer = context->zydis->ZydisDecoderDecodeBuffer;
dec->ZydisFormatterFormatInstruction = context->zydis->ZydisFormatterFormatInstruction;
context->zydis->ZydisDecoderInit(&dec->decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64);
context->zydis->ZydisFormatterInit(&dec->formatter, ZYDIS_FORMATTER_STYLE_INTEL);
#endif
return dec;
#endif
}
void DeleteX64TraceDecoder(zydis_dec_t** dec)
{
#ifdef HAVE_TRACE
box_free(*dec);
*dec = NULL;
#endif
}
const char* DecodeX64Trace(zydis_dec_t* dec, uintptr_t p, int withhex)
{
#ifndef HAVE_TRACE
return "???";
#else
static char buff[512];
#ifndef ZYDIS3
if (ZYAN_SUCCESS(dec->ZydisDecoderDecodeFull(&dec->decoder, (char*)p, 15,
&dec->instruction, dec->operands)))
#else
if (ZYAN_SUCCESS(dec->ZydisDecoderDecodeBuffer(&dec->decoder, (char*)p, 15,
&dec->instruction)))
#endif
{
char tmp[511];
buff[0] = '\0';
if (withhex) {
for (int i = 0; i < dec->instruction.length; ++i) {
sprintf(tmp, "%02X ", *((unsigned char*)p + i));
strcat(buff, tmp);
}
}
#ifndef ZYDIS3
dec->ZydisFormatterFormatInstruction(&dec->formatter, &dec->instruction, dec->operands, dec->instruction.operand_count, tmp, sizeof(tmp), p, ZYAN_NULL);
#else
dec->ZydisFormatterFormatInstruction(&dec->formatter, &dec->instruction, tmp, sizeof(tmp), p);
#endif
strncat(buff, tmp, sizeof(buff)-1);
} else {
snprintf(buff, sizeof(buff), "Decoder failed @%p: ", (void*)p);
if (withhex) {
char tmp[10];
for (int i = 0; i < 15; ++i) {
sprintf(tmp, "%02X ", *((unsigned char*)p + i));
strcat(buff, tmp);
}
}
}
return buff;
#endif
}
int OpcodeOK(zydis_dec_t* dec, uintptr_t p)
{
#ifndef HAVE_TRACE
return 1;
#else
#ifndef ZYDIS3
if (ZYAN_SUCCESS(dec->ZydisDecoderDecodeFull(&dec->decoder, (char*)p, 15,
&dec->instruction, dec->operands)))
#else
if (ZYAN_SUCCESS(dec->ZydisDecoderDecodeBuffer(&dec->decoder, (char*)p, 15,
&dec->instruction)))
#endif
return 1;
return 0;
#endif
}
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