From: "Ying Chu" <xjtuychu@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: sysenter cause a segmentation fault.
Date: Sun, 18 Mar 2007 16:08:43 +0800 [thread overview]
Message-ID: <b965e8580703180108t6bc50b0eg895c5464463ab09@mail.gmail.com> (raw)
A simple code running on PIII 800,kernel 2.6.20 with SEP enabled
causes a segmentation fault.
The slice is as following.
#include <stdio.h>
#include <sys/syacall.h>
int main()
{
unsigned long ret=0;
__asm__ __volatile__ ("movl %1,%%eax\n\tpushl %%ecx\n\t"
"pushl %%edx\n\tpush %%ebp\n\t"
"movl %%esp,%%ebp\n\t" "sysenter\n\t"
"movl %%eax,%0"
:"=m"(ret)
:"b"(SYS_getuid));
printf("%d\n",ret);
return 0;
}
More, when i enabled Kdb and set "bp sysenter_entry",it went with a
catastrophic error errupted.
next reply other threads:[~2007-03-18 8:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-18 8:08 Ying Chu [this message]
2007-03-18 15:51 ` Andi Kleen
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