arch/xtensa/kernel/syscall.c

   1 /*
   2  * arch/xtensa/kernel/syscall.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  * Copyright (C) 2000 Silicon Graphics, Inc.
  10  * Copyright (C) 1995 - 2000 by Ralf Baechle
  11  *
  12  * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
  13  * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
  14  * Chris Zankel <chris@zankel.net>
  15  * Kevin Chea
  16  *
  17  */
  18 #include <asm/uaccess.h>
  19 #include <asm/syscall.h>
  20 #include <asm/unistd.h>
  21 #include <linux/linkage.h>
  22 #include <linux/stringify.h>
  23 #include <linux/errno.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/file.h>
  26 #include <linux/fs.h>
  27 #include <linux/mman.h>
  28 #include <linux/shm.h>
  29
  30 typedef void (*syscall_t)(void);
  31
  32 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
  33         [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
  34
  35 #undef __SYSCALL
  36 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
  37 #undef _XTENSA_UNISTD_H
  38 #undef  __KERNEL_SYSCALLS__
  39 #include <asm/unistd.h>
  40 };
  41
  42 /*
  43  * xtensa_pipe() is the normal C calling standard for creating a pipe. It's not
  44  * the way unix traditional does this, though.
  45  */
  46
  47 asmlinkage long xtensa_pipe(int __user *userfds)
  48 {
  49         int fd[2];
  50         int error;
  51
  52         error = do_pipe(fd);
  53         if (!error) {
  54                 if (copy_to_user(userfds, fd, 2 * sizeof(int)))
  55                         error = -EFAULT;
  56         }
  57         return error;
  58 }
  59
  60
  61 asmlinkage long xtensa_mmap2(unsigned long addr, unsigned long len,
  62                              unsigned long prot, unsigned long flags,
  63                              unsigned long fd, unsigned long pgoff)
  64 {
  65         int error = -EBADF;
  66         struct file * file = NULL;
  67
  68         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  69         if (!(flags & MAP_ANONYMOUS)) {
  70                 file = fget(fd);
  71                 if (!file)
  72                         goto out;
  73         }
  74
  75         down_write(&current->mm->mmap_sem);
  76         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  77         up_write(&current->mm->mmap_sem);
  78
  79         if (file)
  80                 fput(file);
  81 out:
  82         return error;
  83 }
  84
  85 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
  86 {
  87         unsigned long ret;
  88         long err;
  89
  90         err = do_shmat(shmid, shmaddr, shmflg, &ret);
  91         if (err)
  92                 return err;
  93         return (long)ret;
  94 }
  95