perl modules for CUBINs patching

After playing a bit with my ced I came to the conclusion that implemented DSL for editing is not enough - like it would be good to have subroutines to patch repeated/similar instructions, check that patched instruction is what I want, patch attributes/relocs etc

In other words, I need full-fledged PL. Although I've read books series "modern compiler implementation" from Andrew Appel and "crafting interpreters" I think making my own PL is overkill, so I made several XS modules to edit/patch CUBIN files for Perl. Why Perl?

• I am able to write on it almost all I want
• when I can't - I can always to develop my own module(s)
  
• yet I don't feel sick like from pseudo languages like python
• and it damn good and fast when you try to sketch out prototypes for things you have no idea how to make
  

 

ELF::FatBinary

source

for extracting/replacing CUBIN files from FatBinaries

see details here

Cubin::Ced 

source

In essence this is wrapper around Ced - it allows you to disasm/patch SASS instructions

Currently it don't support registers tracking

See doc in POD format 

Cubin::Attrs

source

Module to extract/patch attributes of CUBIN files + also relocs

doc in POD format

Sample

to get a taste see this script - it

• loads CUBIN file and sets up right sections
  
• patches special registers in dedicated subroutine patch_s2r
• then patches relocs 
  

Note that you must setup SM_DIR env var to full directory with SASS disasm smXXX.so shared libraries

Installation

All 3 modules depend from ELFIO and base module Elf::Reader

For this reason you need patch all Makefile.PL files for path to ELFIO in INC var

Also I used dirty hack to embed full path of Elf::Reader so you need to build and install it first 

Next standard process:

perl Makefile.PL

make

sudo make install 

 

Happy hacking!