elf2djgpp

What is this?

• A command line tool, elf2djgpp, that will convert x86 ELF object files to DJGPP COFF-GO32 objects.
• An example project where both C and Rust functions are used, and DJGPP is used as Rust's global allocator.

What does it do?

1. An ELF object is loaded using the elf crate
2. Symbols get prefixed with _ as DJGPP expects.
3. Code sections with relative relocations are modified so that the address operands point to the section start as DJGPP expects.
4. Missing compiler_builtins symbols are replaced with DJGPP functions.

How do I try it?

You'll need these installed:

• Rust nightly
• DJGPP (i586-pc-msdosdjgpp-djgpp in your $PATH)

Build release or debug binaries:

$ cd example
$ make release  # creates build/release/example.exe
$ make debug    # creates build/debug/example.exe (much larger)

Should I use this for anything serious?

No. This is an exploration of file formats that ended up producing a useful script, but it's untested and probably not complete.