linux-kernel - Re: [GIT]: Sparc

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Date:	Thu, 24 Apr 2008 08:39:37 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	akpm@...ux-foundation.org, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT]: Sparc



On Thu, 24 Apr 2008, David Miller wrote:
> 
> 2) Make use of an unused field in pt_regs to store both
>    a magic number, and the trap number, this allows:
> 
>    a) Removing the funny passing of the "restart_syscall"
>       boolean in the trap return paths to the signal dispatch.
> 
>    b) Allow more accurate stack backtraces, since we have the
>       magic cookie, we can detect trap frames accurately.
> 
>    c) The UTRACE guys want to be able to detect if a thread
>       off the cpu is in a system call, they can do that trivially
>       now just like they can on x86.
> 
>    In fact much of this idea is from Roland McGrath.

Heh. This is what x86 has done since day#1. I wonder why other 
architectures wouldn't have copied that part..

That's "orig_eax". It's a strange name, it really has nothing to do with 
"eax" except for the fact that the system call number comes from that 
register - for traps etc it's a negative value.

			Linus
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