arch/avr32/kernel/sys_avr32.c

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/errno.h>
   9 #include <linux/fs.h>
  10 #include <linux/file.h>
  11 #include <linux/mm.h>
  12 #include <linux/unistd.h>
  13
  14 #include <asm/mman.h>
  15 #include <asm/uaccess.h>
  16
  17 asmlinkage int sys_pipe(unsigned long __user *filedes)
  18 {
  19         int fd[2];
  20         int error;
  21
  22         error = do_pipe(fd);
  23         if (!error) {
  24                 if (copy_to_user(filedes, fd, sizeof(fd)))
  25                         error = -EFAULT;
  26         }
  27         return error;
  28 }
  29
  30 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  31                           unsigned long prot, unsigned long flags,
  32                           unsigned long fd, off_t offset)
  33 {
  34         int error = -EBADF;
  35         struct file *file = NULL;
  36
  37         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  38         if (!(flags & MAP_ANONYMOUS)) {
  39                 file = fget(fd);
  40                 if (!file)
  41                         return error;
  42         }
  43
  44         down_write(&current->mm->mmap_sem);
  45         error = do_mmap_pgoff(file, addr, len, prot, flags, offset);
  46         up_write(&current->mm->mmap_sem);
  47
  48         if (file)
  49                 fput(file);
  50         return error;
  51 }
  52
  53 int kernel_execve(const char *file, char **argv, char **envp)
  54 {
  55         register long scno asm("r8") = __NR_execve;
  56         register long sc1 asm("r12") = (long)file;
  57         register long sc2 asm("r11") = (long)argv;
  58         register long sc3 asm("r10") = (long)envp;
  59
  60         asm volatile("scall"
  61                      : "=r"(sc1)
  62                      : "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
  63                      : "cc", "memory");
  64         return sc1;
  65 }