linux-kernel - Re: [10 PATCHES] inline functions to avoid stack overflow

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Message-Id: <20080701.214507.261426026.davem@davemloft.net>
Date:	Tue, 01 Jul 2008 21:45:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mpatocka@...hat.com
Cc:	helge.hafting@...el.hist.no, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: [10 PATCHES] inline functions to avoid stack overflow

From: Mikulas Patocka <mpatocka@...hat.com>
Date: Wed, 2 Jul 2008 00:39:35 -0400 (EDT)

> The ABI is very vague about it. The V9 ABI just displays that 6-word space 
> in a figure bug doesn't say anything about it's usage. The V8 ABI just 
> says that "the function may write incoming arguments there". If it may 
> write anything other, it is unknown --- probably yes, but it is not said 
> in the document.
> 
> The document nicely specifies who owns which registers, but doesn't say 
> that about the stack space :-(

Actually, I know for a fact that you have to have those slots there.

A long time ago in the sparc64 kernel, in the trap entry code, I tried
only giving 128 bytes of stack frame as the trap entry called into C
code.  And it did not work, I had to put the 6 slots there.
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