Re: [patch] handle unaligned arm abs relocs

[Mike Frysinger <vapier at gentoo dot org>]

On Monday 19 December 2011 12:45:30 Joseph S. Myers wrote:
> On Mon, 12 Dec 2011, Mike Frysinger wrote:
> > +	    /* Support relocations on mis-aligned offsets.  */
> > +	    memcpy (&reloc_value, reloc_addr_arg, sizeof (reloc_value));
> > +	    reloc_value += value;
> > +	    memcpy (reloc_addr_arg, &reloc_value, sizeof (reloc_value));
> 
> It seems from the discussion that it would be useful to see exactly what
> code ends up getting generated for these memcpy calls.  Is it a function
> call or inlined?  What about all the other memcpy calls in the dynamic
> linker?  For calls to memcpy that really are function calls, do they end
> up going through the PLT, or do they end up as direct calls to the copy of
> memcpy in the dynamic linker (given that it's linked with a version script
> that hides memcpy along with all the other libc functions it uses, so it
> shouldn't be necessary for calls to go through the PLT)?

i was in the process of implementing Richard's suggestion for using a struct 
and gcc attributes.  but i'm hitting unrelated arm build failures which i'm 
trying to resolve before moving on ...
-mike

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