arch/parisc/kernel/sys_parisc.c

   1 /*
   2  * linux/arch/parisc/kernel/sys_parisc.c
   3  *
   4  * this implements the missing syscalls.
   5  */
   6
   7 #include <asm/uaccess.h>
   8 #include <linux/file.h>
   9 #include <linux/fs.h>
  10 #include <linux/linkage.h>
  11 #include <linux/mm.h>
  12 #include <linux/mman.h>
  13 #include <linux/smp_lock.h>
  14
  15 /* for some reason, "old_readdir" is the only syscall which does not begin
  16  * with "sys_", which breaks the ENTRY_* macros in syscall.S so I "fixed"
  17  * it here.
  18  */
  19
  20 int sys_old_readdir(unsigned int fd, void *dirent, unsigned int count)
  21 {
  22     return old_readdir(fd, dirent, count);
  23 }
  24
  25 int sys_pipe(int *fildes)
  26 {
  27         int fd[2];
  28         int error;
  29
  30         lock_kernel();
  31         error = do_pipe(fd);
  32         unlock_kernel();
  33         if (!error) {
  34                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  35                         error = -EFAULT;
  36         }
  37         return error;
  38 }
  39
  40 int sys_pause(void)
  41 {
  42         current->state = TASK_INTERRUPTIBLE;
  43         schedule();
  44         return -ERESTARTNOHAND;
  45 }
  46
  47 int sys_mmap(unsigned long addr, unsigned long len,
  48                 unsigned long prot, unsigned long flags, unsigned long fd,
  49                 unsigned long offset)
  50 {
  51         struct file * file = NULL;
  52         int error;
  53
  54         down(&current->mm->mmap_sem);
  55         lock_kernel();
  56         if (!(flags & MAP_ANONYMOUS)) {
  57                 error = -EBADF;
  58                 file = fget(fd);
  59                 if (!file)
  60                         goto out;
  61         }
  62         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  63         error = do_mmap(file, addr, len, prot, flags, offset);
  64         if (file != NULL)
  65                 fput(file);
  66 out:
  67         unlock_kernel();
  68         up(&current->mm->mmap_sem);
  69         return error;
  70 }
  71
  72 int sys_ioperm(unsigned long from, unsigned long num, int on)
  73 {
  74         return -ENOSYS;
  75 }
  76
  77 long sys_shmat_wrapper(int shmid, void *shmaddr, int shmflag)
  78 {
  79         extern int sys_shmat(int shmid, char *shmaddr, int shmflg,
  80                              unsigned long * raddr);
  81         unsigned long raddr;
  82         int r;
  83
  84         r = sys_shmat(shmid, shmaddr, shmflag, &raddr);
  85         if (r < 0)
  86                 return r;
  87         return raddr;
  88 }