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Re: powerpc64-linux hack

From: Alan Modra <amodra at bigpond dot net dot au>
To: Richard Henderson <rth at redhat dot com>
Cc: binutils at sources dot redhat dot com, mostrows at watson dot ibm dot com
Date: Tue, 12 Aug 2003 09:54:16 +0930
Subject: Re: powerpc64-linux hack
References: <20030811112952.GZ27145@bubble.sa.bigpond.net.au><20030811185734.GB24357@redhat.com>

On Mon, Aug 11, 2003 at 11:57:34AM -0700, Richard Henderson wrote:
> On Mon, Aug 11, 2003 at 08:59:52PM +0930, Alan Modra wrote:
> > +			   && strcmp (h->root.root.string,
> > +				      ".__libc_start_main") == 0)
> 
> You really should use a special branch relocation instead.
> This could be used elsewhere as well, no doubt.

Yeah, well, it didn't seem worth it.  The "right" fix in this instance
is to simply add a nop after the "bl .__libc_start_main" call in crt1.o.
It's not that the nop is needed as a placeholder to restore r2 because
we never return, but that the bl,nop sequence is used for extern calls
and is recognized by the linker.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre

References:
- powerpc64-linux hack
  - From: Alan Modra
- Re: powerpc64-linux hack
  - From: Richard Henderson

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