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 /*
  32  * sys_pipe() is the normal C calling standard for creating
  33  * a pipe. It's not the way unix traditionally does this, though.
  34  */
  35 asmlinkage long sys_pipe(unsigned long __user * fildes)
  36 {
  37         int fd[2];
  38         int error;
  39
  40         error = do_pipe(fd);
  41         if (!error) {
  42                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  43                         error = -EFAULT;
  44         }
  45         return error;
  46 }
  47
  48 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  49                           unsigned long prot, unsigned long flags,
  50                           unsigned long fd, unsigned long pgoff)
  51 {
  52         int error = -EBADF;
  53         struct file * file = NULL;
  54
  55         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  56         if (!(flags & MAP_ANONYMOUS)) {
  57                 file = fget(fd);
  58                 if (!file)
  59                         goto out;
  60         }
  61
  62         /* As with sparc32, make sure the shift for mmap2 is constant
  63            (12), no matter what PAGE_SIZE we have.... */
  64
  65         /* But unlike sparc32, don't just silently break if we're
  66            trying to map something we can't */
  67         if (pgoff & ((1<<(PAGE_SHIFT-12))-1))
  68                 return -EINVAL;
  69
  70         pgoff >>= (PAGE_SHIFT - 12);
  71
  72         down_write(&current->mm->mmap_sem);
  73         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  74         up_write(&current->mm->mmap_sem);
  75
  76         if (file)
  77                 fput(file);
  78 out:
  79         return error;
  80 }
  81
  82 #if 0 /* DAVIDM - do we want this */
  83 struct mmap_arg_struct64 {
  84         __u32 addr;
  85         __u32 len;
  86         __u32 prot;
  87         __u32 flags;
  88         __u64 offset; /* 64 bits */
  89         __u32 fd;
  90 };
  91
  92 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
  93 {
  94         int error = -EFAULT;
  95         struct file * file = NULL;
  96         struct mmap_arg_struct64 a;
  97         unsigned long pgoff;
  98
  99         if (copy_from_user(&a, arg, sizeof(a)))
 100                 return -EFAULT;
 101
 102         if ((long)a.offset & ~PAGE_MASK)
 103                 return -EINVAL;
 104
 105         pgoff = a.offset >> PAGE_SHIFT;
 106         if ((a.offset >> PAGE_SHIFT) != pgoff)
 107                 return -EINVAL;
 108
 109         if (!(a.flags & MAP_ANONYMOUS)) {
 110                 error = -EBADF;
 111                 file = fget(a.fd);
 112                 if (!file)
 113                         goto out;
 114         }
 115         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 116
 117         down_write(&current->mm->mmap_sem);
 118         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 119         up_write(&current->mm->mmap_sem);
 120         if (file)
 121                 fput(file);
 122 out:
 123         return error;
 124 }
 125 #endif
 126
 127 /*
 128  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 129  *
 130  * This is really horribly ugly.
 131  */
 132 asmlinkage long sys_ipc(unsigned long call,
 133                         unsigned long first,
 134                         unsigned long second,
 135                         unsigned long third,
 136                         void __user *ptr,
 137                         unsigned long fifth)
 138 {
 139         int version, ret;
 140
 141         version = call >> 16; /* hack for backward compatibility */
 142         call &= 0xffff;
 143
 144         switch (call) {
 145         case SEMOP:
 146                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
 147         case SEMTIMEDOP:
 148                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
 149                                       (const struct timespec __user *)fifth);
 150
 151         case SEMGET:
 152                 return sys_semget (first, second, third);
 153         case SEMCTL: {
 154                 union semun fourth;
 155                 if (!ptr)
 156                         return -EINVAL;
 157                 if (get_user(fourth.__pad, (void * __user *) ptr))
 158                         return -EFAULT;
 159                 return sys_semctl (first, second, third, fourth);
 160         }
 161
 162         case MSGSND:
 163                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 164                                    second, third);
 165         case MSGRCV:
 166                 switch (version) {
 167                 case 0: {
 168                         struct ipc_kludge tmp;
 169                         if (!ptr)
 170                                 return -EINVAL;
 171
 172                         if (copy_from_user(&tmp,
 173                                            (struct ipc_kludge __user *) ptr,
 174                                            sizeof (tmp)))
 175                                 return -EFAULT;
 176                         return sys_msgrcv (first, tmp.msgp, second,
 177                                            tmp.msgtyp, third);
 178                 }
 179                 default:
 180                         return sys_msgrcv (first,
 181                                            (struct msgbuf __user *) ptr,
 182                                            second, fifth, third);
 183                 }
 184         case MSGGET:
 185                 return sys_msgget ((key_t) first, second);
 186         case MSGCTL:
 187                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 188
 189         case SHMAT:
 190                 switch (version) {
 191                 default: {
 192                         ulong raddr;
 193                         ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 194                         if (ret)
 195                                 return ret;
 196                         return put_user (raddr, (ulong __user *) third);
 197                 }
 198                 case 1: /* iBCS2 emulator entry point */
 199                         if (!segment_eq(get_fs(), get_ds()))
 200                                 return -EINVAL;
 201                         /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
 202                         return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
 203                 }
 204         case SHMDT:
 205                 return sys_shmdt ((char __user *)ptr);
 206         case SHMGET:
 207                 return sys_shmget (first, second, third);
 208         case SHMCTL:
 209                 return sys_shmctl (first, second,
 210                                    (struct shmid_ds __user *) ptr);
 211         default:
 212                 return -ENOSYS;
 213         }
 214 }