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Re: PowerPC prologue analysis

From: Aleksandar Ristovski <aristovski at qnx dot com>
To: gdb at sources dot redhat dot com
Date: Mon, 28 Jul 2008 16:29:18 -0400
Subject: Re: PowerPC prologue analysis
References: <g6l92j$330$1@ger.gmane.org> <20080728201312.GA3911@caradoc.them.org>

Daniel Jacobowitz wrote:

On Mon, Jul 28, 2008 at 04:09:54PM -0400, Aleksandar Ristovski wrote:
I am not very familiar with PowerPC ABI, but from what I gather reading the "function call" section, but can not see where is it stated that if r30 is saved, then r31 must be saved too? But again, I haven't studied the ABI very thoroughly and might be missing that line.
Might want to look at this patch:

http://sourceware.org/ml/gdb-patches/2007-12/msg00111.html

Thanks for the link! I briefly looked at the patch and it seems to address some of the things I am talking about (r30-r31 issue) but the comment still reads:

+     All gpr's from saved_gpr to gpr31 are saved (except during the
+     prologue).  */

Is that in the ABI? I would think that if it is, then the code I am looking at is not according to it (gcc issue or just me not understanding powerpc assembly?).

Follow-Ups:
- Re: PowerPC prologue analysis
  - From: Daniel Jacobowitz

References:
- PowerPC prologue analysis
  - From: Aleksandar Ristovski
- Re: PowerPC prologue analysis
  - From: Daniel Jacobowitz

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