[RFC/PATCH 5/5] powerpc: Allow ptrace write to pt_regs trap

[Ulrich Weigand]

Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote on 05/29/2007 
11:41:40 PM:

> On Tue, 2007-05-29 at 17:41 +0200, Ulrich Weigand wrote:
> > This doesn't look sufficient.  If you want GDB to use the save/ 
> > restore style means of handling interrupted calls (like i386), 
> > at the very least we also need the capability to *write* the 
> > orig_gpr3 field, which is currently prohibited.  (I don't know 
> > why this is case, though.) 
> 
> It's not prohibited afaik ... we allow writing to everything <= MQ (39)
> on 32 bits and <= CCR (38) on 64 bits and ORIG_R3 qualifies (34)

Um?  I see this in the PTRACE_POKEUSR case in arch_ptrace:

                if (index == PT_ORIG_R3)
                        break;



Mit freundlichen Gruessen / Best Regards

Ulrich Weigand

-- 
  Dr. Ulrich Weigand | Phone: +49-7031/16-3727
  GNU compiler/toolchain for Linux on System z and Cell BE
  IBM Deutschland Entwicklung GmbH
  Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: 
Herbert Kircher
  Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht 
Stuttgart, HRB 243294
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ozlabs.org/pipermail/linuxppc-dev/attachments/20070530/b5a6f23e/attachment.htm>