linux-kernel - Re: [patch 15/21] ptrace changes

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Message-Id: <1225885284.17430.7.camel@localhost>
Date:	Wed, 05 Nov 2008 12:41:24 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	David Smith <dsmith@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [patch 15/21] ptrace changes

On Mon, 2008-11-03 at 11:14 -0600, David Smith wrote: 

> Is this correct, or should the 1st syscall argument be found in
> regs->orig_gpr2 by syscall_get_arguments()/syscall_set_arguments()?

The question is when do syscall_get_arguments and syscall_set_arguments
functions get called? If they are called on a call chain that started
from do_syscall_trace_enter then we'd have to use orig_gpr2 instead of
gprs[2] but if the functions are not called via do_syscall_trace_enter
the first argument is located in grprs[2]. As far as I can see the sole
user of syscall_get_arguments is collect_syscall which is used to get
the registers of a blocked process. In this case the kernel call chain
does not include do_syscall_trace_enter, therefore the first argument is
in gprs[2], no?

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.

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