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* Flag T-bit for syscall restart
@ 2008-12-27  3:02 SUGIOKA Toshinobu
  2008-12-27  5:25 ` Paul Mundt
  2008-12-30  0:10 ` Kaz Kojima
  0 siblings, 2 replies; 3+ messages in thread
From: SUGIOKA Toshinobu @ 2008-12-27  3:02 UTC (permalink / raw)
  To: linux-sh

Hi,

Could someone explain me about the patch
http://kerneltrap.org/mailarchive/git-commits-head/2008/10/20/3733624

I can't understand why T-bit(regs->sr & 1) is used
as the condition about restarting syscall at the last hunk.

Thanks.

SUGIOKA Toshinobu


^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: Flag T-bit for syscall restart
  2008-12-27  3:02 Flag T-bit for syscall restart SUGIOKA Toshinobu
@ 2008-12-27  5:25 ` Paul Mundt
  2008-12-30  0:10 ` Kaz Kojima
  1 sibling, 0 replies; 3+ messages in thread
From: Paul Mundt @ 2008-12-27  5:25 UTC (permalink / raw)
  To: linux-sh

On Sat, Dec 27, 2008 at 12:02:01PM +0900, SUGIOKA Toshinobu wrote:
> Hi,
> 
> Could someone explain me about the patch
> http://kerneltrap.org/mailarchive/git-commits-head/2008/10/20/3733624
> 
> I can't understand why T-bit(regs->sr & 1) is used
> as the condition about restarting syscall at the last hunk.
> 
Look at arch/sh/include/asm/syscall_32.h, it is used for syscall error
detection by the regset interface.

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: Flag T-bit for syscall restart
  2008-12-27  3:02 Flag T-bit for syscall restart SUGIOKA Toshinobu
  2008-12-27  5:25 ` Paul Mundt
@ 2008-12-30  0:10 ` Kaz Kojima
  1 sibling, 0 replies; 3+ messages in thread
From: Kaz Kojima @ 2008-12-30  0:10 UTC (permalink / raw)
  To: linux-sh

Paul Mundt <lethal@linux-sh.org> wrote:
> On Sat, Dec 27, 2008 at 12:02:01PM +0900, SUGIOKA Toshinobu wrote:
>> Hi,
>> 
>> Could someone explain me about the patch
>> http://kerneltrap.org/mailarchive/git-commits-head/2008/10/20/3733624
>> 
>> I can't understand why T-bit(regs->sr & 1) is used
>> as the condition about restarting syscall at the last hunk.
>> 
> Look at arch/sh/include/asm/syscall_32.h, it is used for syscall error
> detection by the regset interface.

BTW, I've missed this change for a while.  It means that now T
register is clobbered with syscalls, right?  If so, the clobber
list of the asm statements for syscall in the userland should be
updated, for example.

Regards,
	kaz

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2008-12-30  0:10 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2008-12-27  3:02 Flag T-bit for syscall restart SUGIOKA Toshinobu
2008-12-27  5:25 ` Paul Mundt
2008-12-30  0:10 ` Kaz Kojima

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