From: Paul Mundt <lethal@linux-sh.org>
To: linux-sh@vger.kernel.org
Subject: Re: strace not working with latest git
Date: Fri, 12 Sep 2008 09:35:14 +0000 [thread overview]
Message-ID: <20080912093514.GA10594@linux-sh.org> (raw)
In-Reply-To: <37C9A1F7C45F1F498E9CB8295E7B305C513CBB@em-srv1-kaha.intern.emtrion.de>
On Thu, Sep 11, 2008 at 04:00:16PM +0200, Nylund, Martin wrote:
>
> > I haven't bee able to get strace working on my sh7722 target:
> >
> > $> uname -a
> > Linux 192.168.105.52 2.6.27-rc6-00008-g3ed6d13-dirty #184 Wed
> > Sep 10 17:31:44 CEST 2008 sh4al-dsp unknown
> >
> > $> strace ls
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > .
> > . <repeating many times>
> > .
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > bin etc linuxrc mplayer sbin tmp
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > boot include man opt share usr
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > dev lib mnt proc sys var
> > restart_syscall(<... resuming interrupted call ...>) = 0
> > ~ #
> >
> >
> > I traced the problem a bit and in strace sources, the ptrace
> > call PTRACE_PEEKUSR always returns 0 when fetching the
> > syscall number. I also added a printk to PTRACE_PEEKUSR in
> > arch/sh/kernel/ptrace_32.c and the returned value is always 0.
> >
>
> I got strace now working with following hack. Still don't know why this
> is needed though. get_stack_long() seemst to read data from wrong
> offset...
>
> diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
> index 035cb30..950b7e2 100644
> --- a/arch/sh/kernel/ptrace_32.c
> +++ b/arch/sh/kernel/ptrace_32.c
> @@ -107,6 +107,9 @@ long arch_ptrace(struct task_struct *child, long
> request, long addr, long data)
> struct user * dummy = NULL;
> int ret;
>
> + if(addr<0xff)
> + addr=(addr+0x34);
> +
> switch (request) {
> /* read the word at location addr in the USER area. */
> case PTRACE_PEEKUSR: {
>
This looks very much like the sizeof struct pt_dspregs. What is your
CONFIG_SH_DSP setting? Have you tried changing it and comparing?
next prev parent reply other threads:[~2008-09-12 9:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-10 15:52 strace not working with latest git Nylund, Martin
2008-09-11 9:43 ` AW: " Nylund, Martin
2008-09-11 14:00 ` Nylund, Martin
2008-09-12 9:35 ` Paul Mundt [this message]
2008-09-12 9:54 ` Nylund, Martin
2008-09-12 10:39 ` Paul Mundt
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