sysenter cause a segmentation fault.

[Ying Chu]

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.
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