Zydis  v2.0
Zydis Documentation
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Fast and lightweight x86/x86-64 disassembler library.


Quick Example

The following example program uses Zydis to disassemble a given memory buffer and prints the output to the console.

#include <stdio.h>
#include <inttypes.h>
#include <Zydis/Zydis.h>
int main()
uint8_t data[] =
0x51, 0x8D, 0x45, 0xFF, 0x50, 0xFF, 0x75, 0x0C, 0xFF, 0x75,
0x08, 0xFF, 0x15, 0xA0, 0xA5, 0x48, 0x76, 0x85, 0xC0, 0x0F,
0x88, 0xFC, 0xDA, 0x02, 0x00
// Initialize decoder context.
ZydisDecoder decoder;
// Initialize formatter. Only required when you actually plan to
// do instruction formatting ("disassembling"), like we do here.
ZydisFormatter formatter;
// Loop over the instructions in our buffer.
// The IP is chosen arbitrary here in order to better visualize
// relative addressing.
uint64_t instructionPointer = 0x007FFFFFFF400000;
size_t offset = 0;
size_t length = sizeof(data);
while (ZYDIS_SUCCESS(ZydisDecoderDecodeBuffer(
&decoder, data + offset, length - offset,
instructionPointer, &instruction)))
// Print current instruction pointer.
printf("%016" PRIX64 " ", instructionPointer);
// Format & print the binary instruction
// structure to human readable format.
char buffer[256];
&formatter, &instruction, buffer, sizeof(buffer));
offset += instruction.length;
instructionPointer += instruction.length;

Sample Output

The above example program generates the following output:

007FFFFFFF400000 push rcx
007FFFFFFF400001 lea eax, [rbp-0x01]
007FFFFFFF400004 push rax
007FFFFFFF400005 push qword ptr [rbp+0x0C]
007FFFFFFF400008 push qword ptr [rbp+0x08]
007FFFFFFF40000B call [0x008000007588A5B1]
007FFFFFFF400011 test eax, eax
007FFFFFFF400013 js 0x007FFFFFFF42DB15



Zydis builds cleanly on most platforms without any external dependencies. You can use CMake to generate project files for your favorite C99 compiler.

git clone 'https://github.com/zyantific/zydis.git'
cd zydis
mkdir build && cd build
cmake ..


Either use the Visual Studio 2017 project or build Zydis using CMake (video guide).

ZydisInfo tool




Zydis is licensed under the MIT license.