From: Denis Vlasenko <vda@ilport.com.ua>
To: "linux-os \(Dick Johnson\)" <linux-os@analogic.com>
Subject: Re: Segfault on the i386 enter instruction
Date: Fri, 12 May 2006 17:20:13 +0300
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Cc: "Tomasz Malesinski" <tmal@mimuw.edu.pl>, linux-kernel@vger.kernel.org
References: <20060512131654.GB2994@duch.mimuw.edu.pl> <Pine.LNX.4.61.0605121003450.9012@chaos.analogic.com>
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On Friday 12 May 2006 17:07, linux-os (Dick Johnson) wrote:
> > 	.file	"a.c"
> > 	.version	"01.01"
> > gcc2_compiled.:
> > .section	.rodata
> > .LC0:
> > 	.string	"asdf\n"
> > .text
> > 	.align 4
> > .globl main
> > 	.type	 main,@function
> > main:
> > 	enter $10008, $0
> > #	pushl %ebp
> > #	movl %esp,%ebp
> > #	subl $10008,%esp
> > 	addl $-12,%esp
>          ^^^^^^^^^^^^^^____________ WTF
>          adding a negative number is subtracting that positive value.
>          You just subtracted 0xfffffff3 (on a 32-bit machine) from
>          the stack pointer. It damn-well better seg-fault!

No. Try it yourself.
--
vda
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