arch/frv/kernel/sys_frv.c

   1 /* sys_frv.c: FRV arch-specific syscall wrappers
   2  *
   3  * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * - Derived from arch/m68k/kernel/sys_m68k.c
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/smp.h>
  18 #include <linux/sem.h>
  19 #include <linux/msg.h>
  20 #include <linux/shm.h>
  21 #include <linux/stat.h>
  22 #include <linux/mman.h>
  23 #include <linux/file.h>
  24 #include <linux/utsname.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/ipc.h>
  27
  28 #include <asm/setup.h>
  29 #include <asm/uaccess.h>
  30
  31 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  32                           unsigned long prot, unsigned long flags,
  33                           unsigned long fd, unsigned long pgoff)
  34 {
  35         int error = -EBADF;
  36         struct file * file = NULL;
  37
  38         /* As with sparc32, make sure the shift for mmap2 is constant
  39            (12), no matter what PAGE_SIZE we have.... */
  40
  41         /* But unlike sparc32, don't just silently break if we're
  42            trying to map something we can't */
  43         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
  44                 return -EINVAL;
  45         pgoff >>= PAGE_SHIFT - 12;
  46
  47         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  48         if (!(flags & MAP_ANONYMOUS)) {
  49                 file = fget(fd);
  50                 if (!file)
  51                         goto out;
  52         }
  53
  54         down_write(&current->mm->mmap_sem);
  55         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  56         up_write(&current->mm->mmap_sem);
  57
  58         if (file)
  59                 fput(file);
  60 out:
  61         return error;
  62 }
  63
  64 #if 0 /* DAVIDM - do we want this */
  65 struct mmap_arg_struct64 {
  66         __u32 addr;
  67         __u32 len;
  68         __u32 prot;
  69         __u32 flags;
  70         __u64 offset; /* 64 bits */
  71         __u32 fd;
  72 };
  73
  74 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
  75 {
  76         int error = -EFAULT;
  77         struct file * file = NULL;
  78         struct mmap_arg_struct64 a;
  79         unsigned long pgoff;
  80
  81         if (copy_from_user(&a, arg, sizeof(a)))
  82                 return -EFAULT;
  83
  84         if ((long)a.offset & ~PAGE_MASK)
  85                 return -EINVAL;
  86
  87         pgoff = a.offset >> PAGE_SHIFT;
  88         if ((a.offset >> PAGE_SHIFT) != pgoff)
  89                 return -EINVAL;
  90
  91         if (!(a.flags & MAP_ANONYMOUS)) {
  92                 error = -EBADF;
  93                 file = fget(a.fd);
  94                 if (!file)
  95                         goto out;
  96         }
  97         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  98
  99         down_write(&current->mm->mmap_sem);
 100         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 101         up_write(&current->mm->mmap_sem);
 102         if (file)
 103                 fput(file);
 104 out:
 105         return error;
 106 }
 107 #endif
 108
 109 /*
 110  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 111  *
 112  * This is really horribly ugly.
 113  */
 114 asmlinkage long sys_ipc(unsigned long call,
 115                         unsigned long first,
 116                         unsigned long second,
 117                         unsigned long third,
 118                         void __user *ptr,
 119                         unsigned long fifth)
 120 {
 121         int version, ret;
 122
 123         version = call >> 16; /* hack for backward compatibility */
 124         call &= 0xffff;
 125
 126         switch (call) {
 127         case SEMOP:
 128                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
 129         case SEMTIMEDOP:
 130                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
 131                                       (const struct timespec __user *)fifth);
 132
 133         case SEMGET:
 134                 return sys_semget (first, second, third);
 135         case SEMCTL: {
 136                 union semun fourth;
 137                 if (!ptr)
 138                         return -EINVAL;
 139                 if (get_user(fourth.__pad, (void * __user *) ptr))
 140                         return -EFAULT;
 141                 return sys_semctl (first, second, third, fourth);
 142         }
 143
 144         case MSGSND:
 145                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 146                                    second, third);
 147         case MSGRCV:
 148                 switch (version) {
 149                 case 0: {
 150                         struct ipc_kludge tmp;
 151                         if (!ptr)
 152                                 return -EINVAL;
 153
 154                         if (copy_from_user(&tmp,
 155                                            (struct ipc_kludge __user *) ptr,
 156                                            sizeof (tmp)))
 157                                 return -EFAULT;
 158                         return sys_msgrcv (first, tmp.msgp, second,
 159                                            tmp.msgtyp, third);
 160                 }
 161                 default:
 162                         return sys_msgrcv (first,
 163                                            (struct msgbuf __user *) ptr,
 164                                            second, fifth, third);
 165                 }
 166         case MSGGET:
 167                 return sys_msgget ((key_t) first, second);
 168         case MSGCTL:
 169                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 170
 171         case SHMAT:
 172                 switch (version) {
 173                 default: {
 174                         ulong raddr;
 175                         ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 176                         if (ret)
 177                                 return ret;
 178                         return put_user (raddr, (ulong __user *) third);
 179                 }
 180                 case 1: /* iBCS2 emulator entry point */
 181                         if (!segment_eq(get_fs(), get_ds()))
 182                                 return -EINVAL;
 183                         /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
 184                         return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
 185                 }
 186         case SHMDT:
 187                 return sys_shmdt ((char __user *)ptr);
 188         case SHMGET:
 189                 return sys_shmget (first, second, third);
 190         case SHMCTL:
 191                 return sys_shmctl (first, second,
 192                                    (struct shmid_ds __user *) ptr);
 193         default:
 194                 return -ENOSYS;
 195         }
 196 }