Issue decompiling from PowerPC ASM generated by IDA Pro

[kernaltrap8]

Hello,
I disassembled a ELF from a Playstation 3 and exported it as ASM, however when running it through m2c it gives me this error:

PS C:\cygwin\home\693982\m2c> python3 m2c.py ..\WoRmod\binary\src\EBOOT.asm --target ppc-mwcc-c
/*
Decompilation failure:

unsupported non-nop instruction outside of function (OPDEntry struc)
*/

I don't know why this isn't working. Does m2c not support AltiVec PowerPC?

[SeekyCt]

Yeah, it's just the gc/wii instruction set currently, no altivec

[kernaltrap8]

ah i see. thank you for replying. let me know when AltiVec support is added.

…

On Mon, Aug 28, 2023 at 12:31 PM Seeky ***@***.***> wrote: Yeah, it's just the gc/wii instruction set currently, no altivec — Reply to this email directly, view it on GitHub <#264 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AWQYZDSUXCKYLP6BTNREZN3XXTIWHANCNFSM6AAAAAA4BWXMXU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[simonlindholm]

Can you post the asm you're trying? The issue you're hitting isn't about altivec, it looks like a formatting thing. I imagine altivec instructions won't occur very commonly so m2c might work alright most of the time (although probably not as well as ghidra; we haven't put too much effort into ppc support).

[kernaltrap8]

Can you post the asm you're trying? The issue you're hitting isn't about altivec, it looks like a formatting thing. I imagine altivec instructions won't occur very commonly so m2c might work alright most of the time (although probably not as well as ghidra; we haven't put too much effort into ppc support).

its a whole program, about 250MB of assembly. i can upload it and send it here, if you like. its just the direct dump from the ELF in IDA Pro.

[simonlindholm]

can you try to run m2c on just the first function of it, and post that here if it doesn't work?

[kernaltrap8]

can you try to run m2c on just the first function of it, and post that here if it doesn't work?

how do i specify just a function? sorta like this?
python3 m2c.py EBOOT.asm [function]

[simonlindholm]

Yes, that works. But I was thinking you could modify the .asm file to include just a single function, to have something to post here that's easier to work with and less infringing on copyright.