linux-kernel - Re: [PATCH 8/14] microblaze: use generic ptrace

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Date:	Wed, 03 Feb 2010 12:00:22 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Christoph Hellwig <hch@....de>
CC:	roland@...hat.com, oleg@...hat.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 8/14] microblaze: use generic ptrace_resume code

Acked-by: Michal Simek <monstr@...str.eu>

Christoph Hellwig wrote:
> Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT and
> PTRACE_KILL.  This also makes PTRACE_SINGLESTEP return -EIO while it
> previously succeeded despite not actually causing any kind of single
> stepping.
> 
> Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL
> which it previously wasn't which is consistent with all architectures
> using the modern ptrace code.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> 
> Index: linux-2.6/arch/microblaze/kernel/ptrace.c
> ===================================================================
> --- linux-2.6.orig/arch/microblaze/kernel/ptrace.c	2010-02-02 11:23:56.002003861 +0100
> +++ linux-2.6/arch/microblaze/kernel/ptrace.c	2010-02-02 19:20:16.997254566 +0100
> @@ -110,43 +110,6 @@ long arch_ptrace(struct task_struct *chi
>  		if (rval == 0 && request == PTRACE_PEEKUSR)
>  			rval = put_user(val, (unsigned long *)data);
>  		break;
> -	/* Continue and stop at next (return from) syscall */
> -	case PTRACE_SYSCALL:
> -		pr_debug("PTRACE_SYSCALL\n");
> -	case PTRACE_SINGLESTEP:
> -		pr_debug("PTRACE_SINGLESTEP\n");
> -	/* Restart after a signal.  */
> -	case PTRACE_CONT:
> -		pr_debug("PTRACE_CONT\n");
> -		rval = -EIO;
> -		if (!valid_signal(data))
> -			break;
> -
> -		if (request == PTRACE_SYSCALL)
> -			set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
> -		else
> -			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
> -
> -		child->exit_code = data;
> -		pr_debug("wakeup_process\n");
> -		wake_up_process(child);
> -		rval = 0;
> -		break;
> -
> -	/*
> -	 * make the child exit.  Best I can do is send it a sigkill.
> -	 * perhaps it should be put in the status that it wants to
> -	 * exit.
> -	 */
> -	case PTRACE_KILL:
> -		pr_debug("PTRACE_KILL\n");
> -		rval = 0;
> -		if (child->exit_state == EXIT_ZOMBIE)	/* already dead */
> -			break;
> -		child->exit_code = SIGKILL;
> -		wake_up_process(child);
> -		break;
> -
>  	default:
>  		rval = ptrace_request(child, request, addr, data);
>  	}


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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