Re: debugging gcc-generated assembly

Re: debugging gcc-generated assembly

[Jason Spencer]

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Hi, Gang. 
 
I'm trying to chase a nasty bug in code generated by
GCC 2.7.2 on a Motorola PowerPC 603 core.  I have to
understand the register usage conventions the compiler
uses, but I can't find that in any of the docs. 
Specifically, I'm interested in things like which
register is the "this" pointer, which are used for
parameters, return values, etc.  Is there an easily
accessible doc that goes through those details for my
architecture?
 
Thanks.

Re: debugging gcc-generated assembly

[Ian Lance Taylor]

Jason Spencer <spencer8@sbcglobal.net> writes:

> I'm trying to chase a nasty bug in code generated by
> GCC 2.7.2 on a Motorola PowerPC 603 core.  I have to
> understand the register usage conventions the compiler
> uses, but I can't find that in any of the docs. 
> Specifically, I'm interested in things like which
> register is the "this" pointer, which are used for
> parameters, return values, etc.  Is there an easily
> accessible doc that goes through those details for my
> architecture?

See the "Function Calling Sequence" chapter in
    http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi-1.7.html

The "this" pointer is normally treated as an invisible first
argument.

Ian