From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
David Miller <davem@davemloft.net>,
richm@oldelvet.org.uk, 609371@bugs.debian.org,
ben@decadent.org.uk, sparclinux@vger.kernel.org,
linux-kernel@vger.kernel.org, fweisbec@gmail.com,
mingo@redhat.com
Subject: Re: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36
Date: Wed, 19 Jan 2011 17:34:40 -0500 [thread overview]
Message-ID: <20110119223440.GE23544@Krystal> (raw)
In-Reply-To: <20110119223234.GA20218@merkur.ravnborg.org>
* Sam Ravnborg (sam@ravnborg.org) wrote:
> >
> > I still wonder how a 32-bit system can generate an unaligned access trap for an
> > access to a 64-bit variable aligned on 32-bit, given that there is, by
> > definition, no 64-bit memory accesses available on the architecture ?
>
> From the SPARC V8 manual (this is the 32 bit version of SPARC):
>
> Load/Store Instructions
>
> ...
> Integer load and store instructions support byte (8-bit), halfword (16-bit), word
> (32-bit), and doubleword (64-bit) accesses.
> ...
>
> Alignment Restrictions
>
> Halfword accesses must be aligned on a 2-byte boundary, word accesses (which
> include instruction fetches) must be aligned on a 4-byte boundary, and doubleword
> accesses must be aligned on an 8-byte boundary. An improperly aligned
> address causes a load or store instruction to generate a mem_address_not_aligned
> trap.
Ah! There is always an odd case ;) Thanks!
Mathieu
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
next prev parent reply other threads:[~2011-01-19 22:34 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20110113.155700.102679408.davem@davemloft.net>
[not found] ` <4D302B2F.7030108@oldelvet.org.uk>
[not found] ` <4D3074FE.3030707@oldelvet.org.uk>
2011-01-16 5:17 ` Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36 David Miller
2011-01-16 14:17 ` Richard Mortimer
2011-01-16 19:39 ` David Miller
2011-01-17 14:11 ` Steven Rostedt
2011-01-17 14:37 ` Bastian Blank
2011-01-17 19:35 ` Mathieu Desnoyers
2011-01-18 6:36 ` David Miller
2011-01-18 5:34 ` David Miller
2011-01-18 6:00 ` David Miller
2011-01-18 6:08 ` David Miller
2011-01-18 16:46 ` Mathieu Desnoyers
2011-01-18 17:33 ` Steven Rostedt
2011-01-18 18:16 ` Steven Rostedt
2011-01-18 18:26 ` Steven Rostedt
2011-01-18 20:13 ` Mathieu Desnoyers
2011-01-18 20:22 ` Steven Rostedt
2011-01-19 5:08 ` Mathieu Desnoyers
2011-01-19 5:16 ` David Miller
2011-01-19 15:10 ` Mathieu Desnoyers
2011-01-19 16:14 ` Sam Ravnborg
2011-01-19 16:18 ` Mathieu Desnoyers
2011-01-19 6:32 ` David Miller
2011-01-19 7:20 ` David Miller
2011-01-19 15:33 ` Mathieu Desnoyers
2011-01-19 21:40 ` David Miller
2011-01-19 22:00 ` Steven Rostedt
2011-01-19 22:09 ` David Miller
2011-01-19 22:21 ` Mathieu Desnoyers
2011-01-19 22:23 ` David Miller
2011-01-19 22:32 ` Sam Ravnborg
2011-01-19 22:34 ` Mathieu Desnoyers [this message]
2011-01-19 22:13 ` Mathieu Desnoyers
2011-01-19 22:21 ` David Miller
2011-01-19 22:33 ` Mathieu Desnoyers
2011-01-20 0:41 ` David Miller
2011-01-21 0:04 ` Mathieu Desnoyers
2011-01-21 18:06 ` Richard Mortimer
2011-01-21 18:52 ` Mathieu Desnoyers
2011-01-21 19:15 ` Mathieu Desnoyers
2011-01-21 20:14 ` Richard Mortimer
2011-01-21 20:40 ` Mathieu Desnoyers
2011-01-21 22:50 ` Richard Mortimer
2011-01-22 18:42 ` Richard Mortimer
2011-01-22 18:53 ` Mathieu Desnoyers
2011-01-19 15:46 ` Steven Rostedt
2011-01-19 16:15 ` Mathieu Desnoyers
2011-01-19 18:13 ` Steven Rostedt
2011-01-19 18:20 ` Mathieu Desnoyers
2011-01-19 21:44 ` David Miller
2011-01-19 22:15 ` Mathieu Desnoyers
2011-01-19 22:22 ` David Miller
2011-01-19 15:11 ` Mathieu Desnoyers
2011-01-19 15:27 ` Richard Mortimer
2011-01-17 6:07 ` David Miller
2011-01-17 9:05 ` Jesper Nilsson
2011-02-01 5:11 ` David Miller
2011-02-01 10:03 ` Jesper Nilsson
2011-01-17 10:22 ` Richard Mortimer
2011-01-17 14:15 ` Steven Rostedt
2011-01-18 6:35 ` David Miller
2011-01-18 17:30 ` Steven Rostedt
2011-01-17 19:46 ` R_SPARC_13 (Re: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36) Richard Mortimer
2011-01-17 21:02 ` R_SPARC_13 David Miller
2011-01-17 23:34 ` R_SPARC_13 Richard Mortimer
2011-01-18 0:18 ` R_SPARC_13 David Miller
2011-01-18 0:37 ` R_SPARC_13 David Miller
2011-01-18 1:28 ` R_SPARC_13 Richard Mortimer
2011-01-18 6:50 ` R_SPARC_13 David Miller
2011-01-18 10:52 ` R_SPARC_13 Richard Mortimer
2011-01-18 13:23 ` R_SPARC_13 Richard Mortimer
2011-01-18 21:00 ` R_SPARC_13 David Miller
2011-01-19 4:12 ` R_SPARC_13 David Miller
2011-01-17 14:39 ` Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36 Bernhard R. Link
2011-01-18 5:24 ` David Miller
2011-01-18 9:26 ` Jesper Nilsson
2011-01-18 6:27 ` David Miller
2011-01-18 17:05 ` Steven Rostedt
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