x86_ldasm is a relatively compact x86-64 instruction length disassembler (LDE) based on a stripped down and heavily modified version of x86_dasm. It is fully C99 compliant.
- No external library dependencies
- No dynamic memory allocation
- Supports all x86 and x86-64/AMD64 instructions and most ISA extensions
- Extended information such as PREFIXES (incl. VEX/XOP), OPCODE, MODRM, SIB, DISP
- Single-header precompiled position independent code (32/64 bit)
- @
include/x86_ldasm_precompiled.h - Sources
- @
NB: This library is not particularly well-suited for disassembling "hostile" code (malformed, invalid, undefined behavior, etc.) since most of the error detection logic has been stripped out in favor of a smaller size. It should have no problems in correctly disassembling regular compiler-generated code.
make clean && make allx86_dasm_context_t x86_dctx = {0};
uint8_t code[] = {
0xeb, 0xfe
};
// Use the regular C library
// Disassemble 32-bit code
int len = x86_ldasm(&x86_dctx, X86_DMODE_32BIT, code);
if(len > 0)
{
printf("Instruction's length: %02i", len);
//
// Print additional info such as:
// OPCODE, MODRM, SIB, DISP (see main.c)
//
}
// Use the single-header precompiled library
#include "x86_ldasm_precompiled.h"
x86_ldasm_t x86_ldasm_pre = (x86_ldasm_t)x86_ldasm_lin64_bin;
// Disassemble 64-bit code, don't provide any dasm context struct
int len = x86_ldasm_pre(NULL, 64, code);
if(len > 0)
{
printf("Instruction's length: %02i", len);
}0000 | 6A 60 | LEN: 02 | OPCODE: 6A
0002 | 5A | LEN: 01 | OPCODE: 5A
0003 | 68 63 61 6C 63 | LEN: 05 | OPCODE: 68
0008 | 54 | LEN: 01 | OPCODE: 54
0009 | 59 | LEN: 01 | OPCODE: 59
000A | 48 29 D4 | LEN: 03 | OPCODE: 29 | MODRM: D4
000D | 65 48 8B 32 | LEN: 04 | OPCODE: 8B | MODRM: 32
0011 | 48 8B 76 18 | LEN: 04 | OPCODE: 8B | MODRM: 76 | DISP: 18
0015 | 48 8B 76 10 | LEN: 04 | OPCODE: 8B | MODRM: 76 | DISP: 10
0019 | 48 AD | LEN: 02 | OPCODE: AD
001B | 48 8B 30 | LEN: 03 | OPCODE: 8B | MODRM: 30
001E | 48 8B 7E 30 | LEN: 04 | OPCODE: 8B | MODRM: 7E | DISP: 30
0022 | 03 57 3C | LEN: 03 | OPCODE: 03 | MODRM: 57 | DISP: 3C
0025 | 8B 5C 17 28 | LEN: 04 | OPCODE: 8B | MODRM: 5C | SIB: 17 | DISP: 28
0029 | 8B 74 1F 20 | LEN: 04 | OPCODE: 8B | MODRM: 74 | SIB: 1F | DISP: 20
x86_ldasm is licensed under the Apache License, Version 2.0