target/linux/ubicom32/files/arch/ubicom32/kernel/sys_ubicom32.c

   1 /*
   2  * arch/ubicom32/kernel/sys_ubicom32.c
   3  *   Ubicom32 architecture system call support implementation.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  *
  28  * This file contains various random system calls that
  29  * have a non-standard calling sequence on the Linux/ubicom32
  30  * platform.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/sched.h>
  36 #include <linux/mm.h>
  37 #include <linux/smp.h>
  38 #include <linux/sem.h>
  39 #include <linux/msg.h>
  40 #include <linux/shm.h>
  41 #include <linux/stat.h>
  42 #include <linux/syscalls.h>
  43 #include <linux/mman.h>
  44 #include <linux/file.h>
  45 #include <linux/utsname.h>
  46 #include <linux/ipc.h>
  47 #include <linux/fs.h>
  48 #include <linux/uaccess.h>
  49 #include <linux/unistd.h>
  50
  51 #include <asm/setup.h>
  52 #include <asm/traps.h>
  53 #include <asm/cacheflush.h>
  54
  55 /* common code for old and new mmaps */
  56 static inline long do_mmap2(
  57         unsigned long addr, unsigned long len,
  58         unsigned long prot, unsigned long flags,
  59         unsigned long fd, unsigned long pgoff)
  60 {
  61         int error = -EBADF;
  62         struct file *file = NULL;
  63
  64         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  65         if (!(flags & MAP_ANONYMOUS)) {
  66                 file = fget(fd);
  67                 if (!file)
  68                         goto out;
  69         }
  70
  71         down_write(&current->mm->mmap_sem);
  72         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  73         up_write(&current->mm->mmap_sem);
  74
  75         if (file)
  76                 fput(file);
  77 out:
  78         return error;
  79 }
  80
  81 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  82         unsigned long prot, unsigned long flags,
  83         unsigned long fd, unsigned long pgoff)
  84 {
  85         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  86 }
  87
  88 /*
  89  * Perform the select(nd, in, out, ex, tv) and mmap() system
  90  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  91  * handle more than 4 system call parameters, so these system calls
  92  * used a memory block for parameter passing..
  93  */
  94
  95 struct mmap_arg_struct {
  96         unsigned long addr;
  97         unsigned long len;
  98         unsigned long prot;
  99         unsigned long flags;
 100         unsigned long fd;
 101         unsigned long offset;
 102 };
 103
 104 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
 105 {
 106         struct mmap_arg_struct a;
 107         int error = -EFAULT;
 108
 109         if (copy_from_user(&a, arg, sizeof(a)))
 110                 goto out;
 111
 112         error = -EINVAL;
 113         if (a.offset & ~PAGE_MASK)
 114                 goto out;
 115
 116         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 117
 118         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd,
 119                          a.offset >> PAGE_SHIFT);
 120 out:
 121         return error;
 122 }
 123
 124 struct sel_arg_struct {
 125         unsigned long n;
 126         fd_set *inp, *outp, *exp;
 127         struct timeval *tvp;
 128 };
 129
 130 asmlinkage int old_select(struct sel_arg_struct *arg)
 131 {
 132         struct sel_arg_struct a;
 133
 134         if (copy_from_user(&a, arg, sizeof(a)))
 135                 return -EFAULT;
 136         /* sys_select() does the appropriate kernel locking */
 137         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 138 }
 139
 140 /*
 141  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 142  *
 143  * This is really horribly ugly.
 144  */
 145 asmlinkage int sys_ipc(uint call, int first, int second,
 146                         int third, void *ptr, long fifth)
 147 {
 148         int version, ret;
 149
 150         version = call >> 16; /* hack for backward compatibility */
 151         call &= 0xffff;
 152
 153         if (call <= SEMCTL)
 154                 switch (call) {
 155                 case SEMOP:
 156                         return sys_semop(first, (struct sembuf *)ptr, second);
 157                 case SEMGET:
 158                         return sys_semget(first, second, third);
 159                 case SEMCTL: {
 160                         union semun fourth;
 161                         if (!ptr)
 162                                 return -EINVAL;
 163                         if (get_user(fourth.__pad, (void **) ptr))
 164                                 return -EFAULT;
 165                         return sys_semctl(first, second, third, fourth);
 166                         }
 167                 default:
 168                         return -EINVAL;
 169                 }
 170         if (call <= MSGCTL)
 171                 switch (call) {
 172                 case MSGSND:
 173                         return sys_msgsnd(first, (struct msgbuf *) ptr,
 174                                           second, third);
 175                 case MSGRCV:
 176                         switch (version) {
 177                         case 0: {
 178                                 struct ipc_kludge tmp;
 179                                 if (!ptr)
 180                                         return -EINVAL;
 181                                 if (copy_from_user(&tmp,
 182                                                    (struct ipc_kludge *)ptr,
 183                                                    sizeof(tmp)))
 184                                         return -EFAULT;
 185                                 return sys_msgrcv(first, tmp.msgp, second,
 186                                                    tmp.msgtyp, third);
 187                                 }
 188                         default:
 189                                 return sys_msgrcv(first,
 190                                                   (struct msgbuf *) ptr,
 191                                                   second, fifth, third);
 192                         }
 193                 case MSGGET:
 194                         return sys_msgget((key_t) first, second);
 195                 case MSGCTL:
 196                         return sys_msgctl(first, second,
 197                                            (struct msqid_ds *) ptr);
 198                 default:
 199                         return -EINVAL;
 200                 }
 201         if (call <= SHMCTL)
 202                 switch (call) {
 203                 case SHMAT:
 204                         switch (version) {
 205                         default: {
 206                                 ulong raddr;
 207                                 ret = do_shmat(first, ptr, second, &raddr);
 208                                 if (ret)
 209                                         return ret;
 210                                 return put_user(raddr, (ulong __user *) third);
 211                         }
 212                         }
 213                 case SHMDT:
 214                         return sys_shmdt(ptr);
 215                 case SHMGET:
 216                         return sys_shmget(first, second, third);
 217                 case SHMCTL:
 218                         return sys_shmctl(first, second, ptr);
 219                 default:
 220                         return -ENOSYS;
 221                 }
 222
 223         return -EINVAL;
 224 }
 225
 226 /* sys_cacheflush -- flush (part of) the processor cache.  */
 227 asmlinkage int
 228 sys_cacheflush(unsigned long addr, int scope, int cache, unsigned long len)
 229 {
 230         flush_cache_all();
 231         return 0;
 232 }
 233
 234 asmlinkage int sys_getpagesize(void)
 235 {
 236         return PAGE_SIZE;
 237 }