linux-kernel - Re: [PATCH 1/1] system call notification with self

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Message-ID: <48CA60FC.8050501@linux.vnet.ibm.com>
Date:	Fri, 12 Sep 2008 14:30:52 +0200
From:	Pierre Morel <pmorel@...ux.vnet.ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
	Roland McGrath <roland@...hat.com>,
	Heiko Carstens <heicars2@...ux.vnet.ibm.com>,
	sameske@...ux.vnet.ibm.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, gregkh@...e.de,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	Cedric Le Goater <clg@...ibm.com>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [PATCH 1/1] system call notification with self_ptrace

Hi Dave,

Dave Hansen wrote:
> On Mon, 2008-09-08 at 14:02 +0200, Pierre Morel wrote:
>   
>> +       if (is_self_ptracing(regs->gprs[2])) {
>> +               if (!entryexit) {
>> +                       struct siginfo info;
>> +
>> +                       memset(&info, 0, sizeof(struct siginfo));
>> +                       info.si_signo = SIGSYS;
>> +                       info.si_code = SYS_SYSCALL;
>> +                       info.si_errno = regs->gprs[2];
>> +                       info.si_addr = (void *)regs->orig_gpr2;
>> +                       send_sig_info(SIGSYS, &info, current);
>> +                       regs->gprs[2] = -1;
>> +               }
>> +               return;
>> +       }
>>     
>
> I see you didn't like my suggestions for consolidating some of these
> repetitive code bits across all the architectures.  Did you give that a
>   
I have read your suggestion, but the actual ptrace() implementation uses 
explicit reference to the different architecture dependent registers and 
I think that this portion of code is more readable if the patch keeps 
the actual conventions used by Roland.
> a shot?  Would you like me to produce a patch on top of what you have
> here before this gets merged into mm?
>   
No Dave, thank you.

regards,

Pierre

> -- Dave
>
> --
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-- 
=============
Pierre Morel
RTOS and Embedded Linux

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