From: Bill Gatliff <bgat@billgatliff.com>
To: Bill Gatliff <bgat@billgatliff.com>,
gdb@sourceware.org, linuxppc-embedded@ozlabs.org
Subject: Re: Gdbserver syscall clobber
Date: Thu, 26 Jul 2007 11:28:48 -0500 [thread overview]
Message-ID: <46A8CBC0.8010909@billgatliff.com> (raw)
In-Reply-To: <20070723161512.GA3235@caradoc.them.org>
Daniel Jacobowitz wrote:
> Look around do_signal:
>
> regs->nip -= 4; /* Back up & retry system call */
>
> If your kernel has corrupted the register containing the syscall
> number at this point, that would explain your problem. It will then
> do the wrong syscall. I guess PPC only backs up one instruction.
>
>
Found the code in do_signal, right where you said it would be. I threw
in a printk or two to see what's up when an ERESTARTSYS is detected, and
started getting OOPSes all over the place. Apparently that's not a good
place for printk. :)
Before I go on, can anyone confirm that gdbserver and/or strace _ever_
worked with circa 2.4.16 PPC kernels?
b.g.
--
Bill Gatliff
bgat@billgatliff.com
next prev parent reply other threads:[~2007-07-26 16:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-16 15:43 Gdbserver syscall clobber Bill Gatliff
2007-07-16 15:53 ` Daniel Jacobowitz
2007-07-18 17:42 ` Bill Gatliff
2007-07-18 17:59 ` Bill Gatliff
2007-07-18 18:31 ` Daniel Jacobowitz
2007-07-23 15:37 ` Bill Gatliff
2007-07-23 15:38 ` Bill Gatliff
2007-07-23 16:06 ` Bill Gatliff
2007-07-23 16:15 ` Daniel Jacobowitz
2007-07-26 16:28 ` Bill Gatliff [this message]
2007-07-23 16:19 ` Andreas Schwab
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