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/***************************************************************************************************
Zyan Disassembler Library (Zydis)
Original Author : Florian Bernd
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
/**
* @file
* Demonstrates basic hooking functionality of the `ZydisFormatter` class by implementing
* a custom symbol-resolver.
*/
#include <inttypes.h>
#include <Zycore/Format.h>
#include <Zycore/LibC.h>
#include <Zydis/Zydis.h>
/* ============================================================================================== */
/* Enums and Types */
/* ============================================================================================== */
/**
* Defines the `ZydisSymbol` struct.
*/
typedef struct ZydisSymbol_
{
/**
* The symbol address.
*/
ZyanU64 address;
/**
* The symbol name.
*/
const char* name;
} ZydisSymbol;
/* ============================================================================================== */
/* Static data */
/* ============================================================================================== */
/**
* A static symbol table with some dummy symbols.
*/
static const ZydisSymbol SYMBOL_TABLE[3] =
{
{ 0x007FFFFFFF401000, "SomeModule.EntryPoint" },
{ 0x007FFFFFFF530040, "SomeModule.SomeData" },
{ 0x007FFFFFFF401100, "SomeModule.SomeFunction" }
};
/* ============================================================================================== */
/* Hook callbacks */
/* ============================================================================================== */
ZydisFormatterFunc default_print_address_absolute;
static ZyanStatus ZydisFormatterPrintAddressAbsolute(const ZydisFormatter* formatter,
ZydisFormatterBuffer* buffer, ZydisFormatterContext* context)
{
ZyanU64 address;
ZYAN_CHECK(ZydisCalcAbsoluteAddress(context->instruction, context->operand,
context->runtime_address, &address));
for (ZyanUSize i = 0; i < ZYAN_ARRAY_LENGTH(SYMBOL_TABLE); ++i)
{
if (SYMBOL_TABLE[i].address == address)
{
ZYAN_CHECK(ZydisFormatterBufferAppend(buffer, ZYDIS_TOKEN_SYMBOL));
ZyanString* string;
ZYAN_CHECK(ZydisFormatterBufferGetString(buffer, &string));
return ZyanStringAppendFormat(string, "<%s>", SYMBOL_TABLE[i].name);
}
}
return default_print_address_absolute(formatter, buffer, context);
}
/* ============================================================================================== */
/* Helper functions */
/* ============================================================================================== */
static void DisassembleBuffer(ZydisDecoder* decoder, ZyanU8* data, ZyanUSize length)
{
ZydisFormatter formatter;
ZydisFormatterInit(&formatter, ZYDIS_FORMATTER_STYLE_INTEL);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_FORCE_SEGMENT, ZYAN_TRUE);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_FORCE_SIZE, ZYAN_TRUE);
// Replace the `ZYDIS_FORMATTER_FUNC_PRINT_ADDRESS_ABS` function that formats the absolute
// addresses
default_print_address_absolute = (ZydisFormatterFunc)&ZydisFormatterPrintAddressAbsolute;
ZydisFormatterSetHook(&formatter, ZYDIS_FORMATTER_FUNC_PRINT_ADDRESS_ABS,
(const void**)&default_print_address_absolute);
ZyanU64 runtime_address = 0x007FFFFFFF400000;
ZydisDecodedInstruction instruction;
ZydisDecodedOperand operands[ZYDIS_MAX_OPERAND_COUNT];
char buffer[256];
while (ZYAN_SUCCESS(ZydisDecoderDecodeFull(decoder, data, length, &instruction, operands)))
{
ZYAN_PRINTF("%016" PRIX64 " ", runtime_address);
// We have to pass a `runtime_address` different to `ZYDIS_RUNTIME_ADDRESS_NONE` to
// enable printing of absolute addresses
ZydisFormatterFormatInstruction(&formatter, &instruction, operands,
instruction.operand_count_visible, &buffer[0], sizeof(buffer), runtime_address,
ZYAN_NULL);
ZYAN_PRINTF(" %s\n", &buffer[0]);
data += instruction.length;
length -= instruction.length;
runtime_address += instruction.length;
}
}
/* ============================================================================================== */
/* Entry point */
/* ============================================================================================== */
int main(void)
{
if (ZydisGetVersion() != ZYDIS_VERSION)
{
fputs("Invalid zydis version\n", ZYAN_STDERR);
return EXIT_FAILURE;
}
ZyanU8 data[] =
{
0x48, 0x8B, 0x05, 0x39, 0x00, 0x13, 0x00, // mov rax, qword ptr ds:[<SomeModule.SomeData>]
0x50, // push rax
0xFF, 0x15, 0xF2, 0x10, 0x00, 0x00, // call qword ptr ds:[<SomeModule.SomeFunction>]
0x85, 0xC0, // test eax, eax
0x0F, 0x84, 0x00, 0x00, 0x00, 0x00, // jz 0x007FFFFFFF400016
0xE9, 0xE5, 0x0F, 0x00, 0x00 // jmp <SomeModule.EntryPoint>
};
ZydisDecoder decoder;
ZydisDecoderInit(&decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_STACK_WIDTH_64);
DisassembleBuffer(&decoder, &data[0], sizeof(data));
return 0;
}
/* ============================================================================================== */
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