release/src-rt-6.x.4708/linux/linux-2.6.36/arch/um/kernel/syscall.c

   1 /*
   2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/file.h"
   7 #include "linux/fs.h"
   8 #include "linux/mm.h"
   9 #include "linux/sched.h"
  10 #include "linux/utsname.h"
  11 #include "linux/syscalls.h"
  12 #include "asm/current.h"
  13 #include "asm/mman.h"
  14 #include "asm/uaccess.h"
  15 #include "asm/unistd.h"
  16 #include "internal.h"
  17
  18 long sys_fork(void)
  19 {
  20         long ret;
  21
  22         current->thread.forking = 1;
  23         ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
  24                       &current->thread.regs, 0, NULL, NULL);
  25         current->thread.forking = 0;
  26         return ret;
  27 }
  28
  29 long sys_vfork(void)
  30 {
  31         long ret;
  32
  33         current->thread.forking = 1;
  34         ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
  35                       UPT_SP(&current->thread.regs.regs),
  36                       &current->thread.regs, 0, NULL, NULL);
  37         current->thread.forking = 0;
  38         return ret;
  39 }
  40
  41 long old_mmap(unsigned long addr, unsigned long len,
  42               unsigned long prot, unsigned long flags,
  43               unsigned long fd, unsigned long offset)
  44 {
  45         long err = -EINVAL;
  46         if (offset & ~PAGE_MASK)
  47                 goto out;
  48
  49         err = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  50  out:
  51         return err;
  52 }
  53
  54 int kernel_execve(const char *filename,
  55                   const char *const argv[],
  56                   const char *const envp[])
  57 {
  58         mm_segment_t fs;
  59         int ret;
  60
  61         fs = get_fs();
  62         set_fs(KERNEL_DS);
  63         ret = um_execve(filename, (const char __user *const __user *)argv,
  64                         (const char __user *const __user *) envp);
  65         set_fs(fs);
  66
  67         return ret;
  68 }