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Re: RFA: Add readelf --unwind support for ARM


Hi Daniel,

+  if (elf_header.e_machine == EM_ARM)
+    addr.offset&= ~1;

I suspect that this behaviour might be needed for other architectures as well (MIPS16 maybe ?). So you might as well use a macro that tests e_machine and returns an unmangled offset.

Could you give me an example of what you mean? Something like this?


#define REMOVE_ARCH_BITS(ADDR) do { \
   if (elf_header.e_machine == EM_ARM) \
     ADDR&= ~1; \
   } while (0)

Yeah, exactly that.



Just curious - are there any ARM binaries that use REL relocations
and have unwind tables ?

In practice, I'm not sure. I know there are REL ARM binaries - VxWorks uses REL, but last I checked it wasn't on the EABI yet.

Hmm, well no reason to penalize them if they do change, so I guess supporting both types of relocation is worthwhile.


Cheers
  Nick



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