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sys_frv.c

/* sys_frv.c: FRV arch-specific syscall wrappers
 *
 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from arch/m68k/kernel/sys_m68k.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>

#include <asm/setup.h>
#include <asm/uaccess.h>

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

      /* As with sparc32, make sure the shift for mmap2 is constant
         (12), no matter what PAGE_SIZE we have.... */

      /* But unlike sparc32, don't just silently break if we're
         trying to map something we can't */
      if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
            return -EINVAL;
      pgoff >>= PAGE_SHIFT - 12;

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

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

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

#if 0 /* DAVIDM - do we want this */
struct mmap_arg_struct64 {
      __u32 addr;
      __u32 len;
      __u32 prot;
      __u32 flags;
      __u64 offset; /* 64 bits */
      __u32 fd;
};

asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
{
      int error = -EFAULT;
      struct file * file = NULL;
      struct mmap_arg_struct64 a;
      unsigned long pgoff;

      if (copy_from_user(&a, arg, sizeof(a)))
            return -EFAULT;

      if ((long)a.offset & ~PAGE_MASK)
            return -EINVAL;

      pgoff = a.offset >> PAGE_SHIFT;
      if ((a.offset >> PAGE_SHIFT) != pgoff)
            return -EINVAL;

      if (!(a.flags & MAP_ANONYMOUS)) {
            error = -EBADF;
            file = fget(a.fd);
            if (!file)
                  goto out;
      }
      a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      down_write(&current->mm->mmap_sem);
      error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
      up_write(&current->mm->mmap_sem);
      if (file)
            fput(file);
out:
      return error;
}
#endif

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
asmlinkage long sys_ipc(unsigned long call,
                  unsigned long first,
                  unsigned long second,
                  unsigned long third,
                  void __user *ptr,
                  unsigned long fifth)
{
      int version, ret;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      switch (call) {
      case SEMOP:
            return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
      case SEMTIMEDOP:
            return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
                              (const struct timespec __user *)fifth);

      case SEMGET:
            return sys_semget (first, second, third);
      case SEMCTL: {
            union semun fourth;
            if (!ptr)
                  return -EINVAL;
            if (get_user(fourth.__pad, (void * __user *) ptr))
                  return -EFAULT;
            return sys_semctl (first, second, third, fourth);
      }

      case MSGSND:
            return sys_msgsnd (first, (struct msgbuf __user *) ptr,
                           second, third);
      case MSGRCV:
            switch (version) {
            case 0: {
                  struct ipc_kludge tmp;
                  if (!ptr)
                        return -EINVAL;

                  if (copy_from_user(&tmp,
                                 (struct ipc_kludge __user *) ptr,
                                 sizeof (tmp)))
                        return -EFAULT;
                  return sys_msgrcv (first, tmp.msgp, second,
                                 tmp.msgtyp, third);
            }
            default:
                  return sys_msgrcv (first,
                                 (struct msgbuf __user *) ptr,
                                 second, fifth, third);
            }
      case MSGGET:
            return sys_msgget ((key_t) first, second);
      case MSGCTL:
            return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);

      case SHMAT:
            switch (version) {
            default: {
                  ulong raddr;
                  ret = do_shmat (first, (char __user *) ptr, second, &raddr);
                  if (ret)
                        return ret;
                  return put_user (raddr, (ulong __user *) third);
            }
            case 1:     /* iBCS2 emulator entry point */
                  if (!segment_eq(get_fs(), get_ds()))
                        return -EINVAL;
                  /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
                  return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
            }
      case SHMDT:
            return sys_shmdt ((char __user *)ptr);
      case SHMGET:
            return sys_shmget (first, second, third);
      case SHMCTL:
            return sys_shmctl (first, second,
                           (struct shmid_ds __user *) ptr);
      default:
            return -ENOSYS;
      }
}

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