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sys_avr32.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/unistd.h>

#include <asm/mman.h>
#include <asm/uaccess.h>
#include <asm/syscalls.h>

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
                    unsigned long prot, unsigned long flags,
                    unsigned long fd, off_t offset)
{
      int error = -EBADF;
      struct file *file = NULL;

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  return error;
      }

      down_write(&current->mm->mmap_sem);
      error = do_mmap_pgoff(file, addr, len, prot, flags, offset);
      up_write(&current->mm->mmap_sem);

      if (file)
            fput(file);
      return error;
}

int kernel_execve(const char *file, char **argv, char **envp)
{
      register long scno asm("r8") = __NR_execve;
      register long sc1 asm("r12") = (long)file;
      register long sc2 asm("r11") = (long)argv;
      register long sc3 asm("r10") = (long)envp;

      asm volatile("scall"
                 : "=r"(sc1)
                 : "r"(scno), "0"(sc1), "r"(sc2), "r"(sc3)
                 : "cc", "memory");
      return sc1;
}

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