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pending/2543: RE: ARM single step problem with instruction 0xa5ffffeb
- From: "Lincy Julien \(Neo-Soft\)" <Julien dot Lincy at thomson dot net>
- To: "Daniel Jacobowitz" <dan at codesourcery dot com>
- Cc: <gdb-gnats at sources dot redhat dot com>
- Date: Wed, 22 Oct 2008 16:37:44 +0200
- Subject: pending/2543: RE: ARM single step problem with instruction 0xa5ffffeb
>Number: 2543
>Category: pending
>Synopsis: RE: ARM single step problem with instruction 0xa5ffffeb
>Confidential: yes
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: change-request
>Submitter-Id: unknown
>Arrival-Date: Wed Oct 22 14:48:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:
>Release:
>Organization:
>Environment:
>Description:
Okay thanks for answering
We are going to look for an endianness problem in our environment=20
-----Original Message-----
From: Daniel Jacobowitz [mailto:dan@codesourcery.com]=20
Sent: mercredi 22 octobre 2008 15:00
To: Lincy Julien (Neo-Soft)
Cc: gdb-gnats@sources.redhat.com
Subject: Re: ARM single step problem with instruction 0xa5ffffeb
On Wed, Oct 22, 2008 at 11:41:01AM -0000, julien.lincy@thomson.net
wrote:
> >Description:
> I have a problem single stepping with a simple C program on ARM, with
the instruction 0xa5ffffeb.
>=20
> 8538: a5ffffeb ldrgeb pc, [pc, #4075]! ; 952b
<__clz_tab+0x6b>
>=20
> GDB stops with the error "Invalid update to pc in instruction".
>=20
> The C program i'm trying to test is attached.
> The ARM I use is an ARM v1136 (a bit specific...).
I think there's something wrong with your environment. That's not a
valid instruction; PC is always aligned, so pc+4075 is unaligned.
The middle of __clz_tab doesn't have function pointers in it. And you
can't do PC-relative loads with writeback.
GDB is right to complain about that instruction.
--=20
Daniel Jacobowitz
CodeSourcery
>How-To-Repeat:
>Fix:
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