linux/arch/frv/kernel/sys_frv.c
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   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
  31asmlinkage 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);
  60out:
  61        return error;
  62}
  63
  64#if 0 /* DAVIDM - do we want this */
  65struct 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
  74asmlinkage 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);
 104out:
 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 */
 114asmlinkage 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}
 197