linux-kernel - Re: [PATCH] Fix get ERESTARTSYS with m32 in x86

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Message-ID: <53612634.2070802@zytor.com>
Date:	Wed, 30 Apr 2014 09:35:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mark Kettenis <mark.kettenis@...all.nl>
CC:	pinskia@...il.com, teawater@...il.com, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org, eparis@...hat.com,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	gdb@...rceware.org
Subject: Re: [PATCH] Fix get ERESTARTSYS with m32 in x86_64 when debug by
 GDB

On 04/30/2014 06:35 AM, Mark Kettenis wrote:
> 
> If (and only if) the goal of that TS_COMPAT flag solely is to trigger
> the error code sign-extension in arch/x86/asm/syscall.h:syscall_get_error(),
> we could work around to problem in GDB by checking "orig_ax" to see if
> we're continuing an interrupted system call and sign extend the error
> code in the real "eax" register if we are.
> 

Well... this "if and only if" clause is false, although it might work
specifically in this context.  I need to do a writeup about this... I
should try to do that today.

	-hpa

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