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Re: PLT / non-PIC executable support for MIPS


On Sun, 28 Mar 2010, Daniel Jacobowitz wrote:

> > If there is indeed a target-specific ABIVERSION value for MIPS, then ports 
> > needs its own libc-abis file.  Is there something I don't follow about how 
> > the above matches, or is in fact the static linker never generating the 
> > value 1 (which it does seem to have code to generate) in any context for 
> > which the above code is active?
> 
> I suspect that VALID_ELF_HEADER is not used for the executable.  The
> linker only sets it for the executable, since shared libraries don't
> use PLTs or copy relocs.  Either that, or it's only used for the
> executable if ld.so was invoked directly (but if that were the case, I
> think we'd have noticed a problem by now).

Given that it's only set for the executable, should we still say that 
numbers higher than 1 are used for STB_GNU_UNIQUE (and STT_GNU_IFUNC if 
MIPS gets support for that in future) on MIPS to avoid confusion?  With 1 
being accepted with ELFOSABI_SYSV but higher values only for 
ELFOSABI_LINUX.

(I don't actually see any static linker support to set the ABI versions 
for STB_GNU_UNIQUE and STT_GNU_IFUNC that libc now checks for; I presume 
that will be forthcoming in due course.)

-- 
Joseph S. Myers
joseph@codesourcery.com


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