release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/kernel/sys_i386_32.c

   1 /*
   2  * This file contains various random system calls that
   3  * have a non-standard calling sequence on the Linux/i386
   4  * platform.
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/sched.h>
   9 #include <linux/mm.h>
  10 #include <linux/fs.h>
  11 #include <linux/smp.h>
  12 #include <linux/sem.h>
  13 #include <linux/msg.h>
  14 #include <linux/shm.h>
  15 #include <linux/stat.h>
  16 #include <linux/syscalls.h>
  17 #include <linux/mman.h>
  18 #include <linux/file.h>
  19 #include <linux/utsname.h>
  20 #include <linux/ipc.h>
  21
  22 #include <linux/uaccess.h>
  23 #include <linux/unistd.h>
  24
  25 #include <asm/syscalls.h>
  26
  27 /*
  28  * Do a system call from kernel instead of calling sys_execve so we
  29  * end up with proper pt_regs.
  30  */
  31 int kernel_execve(const char *filename,
  32                   const char *const argv[],
  33                   const char *const envp[])
  34 {
  35         long __res;
  36         asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
  37         : "=a" (__res)
  38         : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
  39         return __res;
  40 }