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A tool for automatic synthesis of DWARF.
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Théophile Bastian 11fa3fab40 Check_gen: patch for flat vs pyramid clang tables 
clang generates tables like this

      LOC           CFA      rbx   rbp   r14   r15   ra
   00000000000028a0 rsp+8    u     u     u     u     c-8
   00000000000028a1 rsp+16   u     u     u     u     c-8
   00000000000028a3 rsp+24   u     u     u     u     c-8
   00000000000028a5 rsp+32   u     u     u     u     c-8
   00000000000028a6 rsp+40   u     u     u     u     c-8
   00000000000028aa rsp+64   c-40  c-16  c-32  c-24  c-8
2019-04-05 16:32:00 +02:00
csmith Check_gen: patch for flat vs pyramid clang tables 2019-04-05 16:32:00 +02:00
curiosities/mov_rsp_rbp_falsepos Curiosities: mov %rsp, %rbp not switching to rbp tracking 2019-04-04 11:51:57 +02:00
DwarfSynth Ignore ghost subroutines for clang 2019-04-05 11:23:18 +02:00
libdwarfw@322e118261 Add libdwarfw as submodule 2018-12-07 17:16:18 +01:00
.gitignore Add synthesize_dwarf.sh 2019-03-18 14:27:24 +01:00
.gitmodules Add libdwarfw as submodule 2018-12-07 17:16:18 +01:00
.merlin Generate CFA tracking with RIP 2018-10-23 19:22:19 +02:00
_tags initial commit of ocaml->c wrappers. as bap linking is already complicated, two independent binaries communicate via a tmp.marshall file for now. 2018-12-30 10:10:51 -08:00
dwarfsynth.ml Add flag to never go back to undefined rbp 2019-04-04 11:52:47 +02:00
DwarfSynth.mlpack initial commit of ocaml->c wrappers. as bap linking is already complicated, two independent binaries communicate via a tmp.marshall file for now. 2018-12-30 10:10:51 -08:00
LICENSE Initial commit 2018-10-12 18:45:04 +02:00
Makefile Add synthesize_dwarf.sh 2019-03-18 14:27:24 +01:00
README.md Add synthesize_dwarf.sh 2019-03-18 14:27:24 +01:00
synthesize_dwarf.sh Add flag to never go back to undefined rbp 2019-04-04 11:52:47 +02:00

README.md

dwarf-synthesis

A tool for automatic synthesis of DWARF.

The purpose of this tool is to take any given binary program or library, examine its assembly code and, based solely on that, generate the corresponding .eh_frame DWARF data.

Dependencies

This tool relies on BAP, which is available through OPAM.

Compiling

Simply run make to compile all the necessary tools, including compiling and installing the BAP plugin dwarfsynth.

Running with a wrapper script

To generate an .eh_frame section for some binary foo.bin and write the output as foo.eh.bin, you can run

./synthesize_dwarf foo.bin foo.eh.bin

You can also omit the second parameter to simply overwrite foo.bin.

Running by hand

If you want, for some reason, to run by hand the multiple components, you can follow this procedure (by using more appropriate file names, and, possibly, a temporary directory -- see mktemp -d).

Running the BAP plugin

bap prog_to_analyze.bin -p dwarfsynth --dwarfsynth-output tmp.marshal

Running ml_dwarf_write

You can get a help text with ./ml_dwarf_write.bin. Otherwise, you can run

./ml_dwarf_write.bin tmp.marshal prog_to_analyze.bin eh_frame_section`

Stitching the section into a binary

objcopy --add-section .eh_frame=eh_frame_section prog_to_analyze.bin prog_to_analyze.eh.bin

Commonly used commands

List a binary sections

objdump -h blah.bin

Strip a binary of its eh_frame

objcopy --remove-section '.eh_frame' --remove-section '.eh_frame_hdr' blah.bin