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         return do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
  21                       &current->thread.regs, 0, NULL, NULL);
  22 }
  23
  24 long sys_vfork(void)
  25 {
  26         return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
  27                       UPT_SP(&current->thread.regs.regs),
  28                       &current->thread.regs, 0, NULL, NULL);
  29 }
  30
  31 long sys_clone(unsigned long clone_flags, unsigned long newsp,
  32                void __user *parent_tid, void __user *child_tid)
  33 {
  34         if (!newsp)
  35                 newsp = UPT_SP(&current->thread.regs.regs);
  36
  37         return do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
  38                       child_tid);
  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 }