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Date: Wed, 31 Oct 2001 09:43:43 +0000
From: Christophe Rhodes <csr21@cam.ac.uk>
To: "David S. Miller" <davem@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SPARC and SA_SIGINFO signal handling
Message-ID: <20011031094342.A27520@cam.ac.uk>
In-Reply-To: <20011029190027.A21372@cam.ac.uk> <20011030.125134.93645850.davem@redhat.com>
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On Tue, Oct 30, 2001 at 12:51:34PM -0800, David S. Miller wrote:
> 
> You're doing something really wrong, it works perfectly
> fine here:
> 
> ? cat test.c
> #include <stdlib.h>
> #include <sys/ucontext.h>
> #include <signal.h>
> 
> void sigsegv_handler (int signo, siginfo_t *info, void *data) {
> 	if (info != 0)
        ^^^^

This gets me the siginfo struct; this is fine, and I'm happy with this
part.

However, what I don't see to get at is the usercontext/ucontext
structure containing register contents and so on, which as far as I am
aware should be in the third (data) argument to the sa_sigaction-type
sighandler; that's where I'm getting my problems.

> 		exit(1);
> 	exit(0);
> }
> [...]

Change the info above to data, and...

[ x86 does what I expect... ]
csr21@lambda:~$ uname -a
Linux lambda 2.4.13-ac4 #1 Mon Oct 29 18:26:51 GMT 2001 i686 unknown
csr21@lambda:~$ ./foo
csr21@lambda:~$ echo $?
1

[ sparc doesn't ]
csr21@caligula:~$ uname -a
Linux caligula 2.4.6 #1 SMP Sun Sep 30 16:40:07 BST 2001 sparc64
unknown
csr21@caligula:~$ ./foo
csr21@caligula:~$ echo $?
0

Thanks,

Christophe
-- 
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