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Re: Why does mips define elf_backend_sign_extend_vma to true?


On Tue, Aug 07, 2001 at 09:42:24PM -0400, Andrew Cagney wrote:
> > On Tue, Aug 07, 2001 at 06:24:59PM -0700, H . J . Lu wrote:
> > 
> >> Only elf32-mips.c has
> >> 
> >> #define elf_backend_sign_extend_vma        true
> >> 
> >> and we get
> >> 
> >> # nm vmlinux
> >> ffffffff802e01f0 D C_A_D
> >> ffffffff802df344 D EISA_bus
> >> ....
> >> 
> >> Does anyone know why mips does this?
> >> 
> > 
> > 
> > It seems that it was done on purpose:
> > 
> > http://sources.redhat.com/ml/binutils/1999-11/msg00080.html
> > 
> > I don't believe it is correct for the normal 32bit MIPS SVR4 ABI. I'd like
> > to turn it off. If you want to do sign extension, you should create a new
> > ABI, not break the existing ABI.
> 
> 
> Several ABI's have implied sign extension of addresses.  MIPS is one.
> 

Show me where it is documemnted in the 32bit SVR4 MIPS ABI.


H.J.


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