Converts asm to pseudo-C code.
Requires radare2
Follow the following steps to install r2dec via r2pm
# initialize the r2pm database
$ r2pm -U
# install r2dec via r2pm
$ r2pm -i r2dec- clone this repository
- Run
meson setup buildto create the build folder - Run
ninja -C build installto build the shared library and to install it
- Open your file with radare2
- Analyze the function you want to disassemble (
af) - Run the plugin via
pdd
[0x00000000]> pdd?
Usage: pdd [args] - core plugin for r2dec
pdd - decompile current function
pdd? - show this help
pdd* - the decompiled code is returned to r2 as comment (via CCu)
pdda - decompile current function side by side with assembly
pddb - decompile current function but shows only scopes
pddo - decompile current function side by side with offsets
pddu - install/upgrade r2dec via r2pm
pdds <branch> - switches r2dec branch
pddi - generates the issue data
Environment
R2DEC_HOME defaults to the root directory of the r2dec repo
[0x00000000]> pdd --help
r2dec [options]
--help | this help message
--assembly | shows pseudo next to the assembly
--blocks | shows only scopes blocks
--casts | shows all casts in the pseudo code
--colors | enables syntax colors
--debug | do not catch exceptions
--html | outputs html data instead of text
--issue | generates the json used for the test suite
--offsets | shows pseudo next to the assembly offset
--paddr | all xrefs uses physical addresses instead of virtual addresses
--xrefs | shows also instruction xrefs in the pseudo code
--as-comment | the decompiled code is returned to r2 as comment (via CCu)
--as-opcode | the decompiled code is returned to r2 as opcode (via aho)
You can use these in your .radare2rc file.
r2dec.asm | if true, shows pseudo next to the assembly.
r2dec.blocks | if true, shows only scopes blocks.
r2dec.casts | if false, hides all casts in the pseudo code.
r2dec.debug | do not catch exceptions in r2dec.
r2dec.paddr | if true, all xrefs uses physical addresses compare.
r2dec.slow | if true load all the data before to avoid multirequests to r2.
r2dec.theme | defines the color theme to be used on r2dec.
r2dec.xrefs | if true, shows all xrefs in the pseudo code.
e scr.html | outputs html data instead of text.
e scr.color | enables syntax colors.
- Open your file with radare2
- Analyze the function you want to disassemble (
af) - Give the data to the plugin via
pddiorpdd --issue - Insert the JSON returned by the previous command into the issue (you can also upload the output)
6502 (experimental)
8051 (experimental)
arm 16/32/64 bit
avr
dalvik
m68k (experimental)
mips
ppc 32/64 bit (VLE included)
superh (experimental)
sparc
v850
wasm (experimental)
x86/x64
This example shows a possible dump of the plugin.
#include <stdio.h>
int main(int argc, char const *argv[]) {
int var = 0;
while(var < 0x90) {
if(var < 0x10) {
var += 0x50;
}
var += 0x10;
}
return 0;
}╭ (fcn) main 50
│ main (int arg1, int arg2);
│ ; var int local_20h @ rbp-0x20
│ ; var int local_14h @ rbp-0x14
│ ; var signed int local_4h @ rbp-0x4
│ ; DATA XREF from entry0 (0x1041)
│ 0x00001119 55 push rbp
│ 0x0000111a 4889e5 mov rbp, rsp
│ 0x0000111d 897dec mov dword [local_14h], edi ; arg1
│ 0x00001120 488975e0 mov qword [local_20h], rsi ; arg2
│ 0x00001124 c745fc000000. mov dword [local_4h], 0
│ ╭─< 0x0000112b eb0e jmp 0x113b
│ │ ; CODE XREF from main (0x1142)
│ ╭──> 0x0000112d 837dfc0f cmp dword [local_4h], 0xf ; [0xf:4]=0x3e000300
│ ╭───< 0x00001131 7f04 jg 0x1137
│ │⋮│ 0x00001133 8345fc50 add dword [local_4h], 0x50 ; 'P'
│ │⋮│ ; CODE XREF from main (0x1131)
│ ╰───> 0x00001137 8345fc10 add dword [local_4h], 0x10
│ ⋮│ ; CODE XREF from main (0x112b)
│ ⋮╰─> 0x0000113b 817dfc8f0000. cmp dword [local_4h], 0x8f ; [0x8f:4]=0x2a800
│ ╰──< 0x00001142 7ee9 jle 0x112d
│ 0x00001144 b800000000 mov eax, 0
│ 0x00001149 5d pop rbp
╰ 0x0000114a c3 ret
/* r2dec pseudo C output */
#include <stdint.h>
int32_t main (int32_t argc, char ** argv) {
char ** local_20h;
int32_t local_14h;
int32_t local_4h;
local_14h = edi;
local_20h = rsi;
local_4h = 0;
while (local_4h <= 0x8f) {
if (local_4h <= 0xf) {
local_4h += 0x50;
}
local_4h += 0x10;
}
eax = 0;
return eax;
}