arch/ppc/kernel/syscalls.c

   1 /*
   2  * linux/arch/ppc/kernel/sys_ppc.c
   3  *
   4  *  PowerPC version
   5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   6  *
   7  * Derived from "arch/i386/kernel/sys_i386.c"
   8  * Adapted from the i386 version by Gary Thomas
   9  * Modified by Cort Dougan (cort@cs.nmt.edu)
  10  * and Paul Mackerras (paulus@cs.anu.edu.au).
  11  *
  12  * This file contains various random system calls that
  13  * have a non-standard calling sequence on the Linux/PPC
  14  * platform.
  15  *
  16  *  This program is free software; you can redistribute it and/or
  17  *  modify it under the terms of the GNU General Public License
  18  *  as published by the Free Software Foundation; either version
  19  *  2 of the License, or (at your option) any later version.
  20  *
  21  */
  22
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/mm.h>
  26 #include <linux/smp.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/sem.h>
  29 #include <linux/msg.h>
  30 #include <linux/shm.h>
  31 #include <linux/stat.h>
  32 #include <linux/mman.h>
  33 #include <linux/sys.h>
  34 #include <linux/ipc.h>
  35 #include <linux/utsname.h>
  36 #include <linux/file.h>
  37
  38 #include <asm/uaccess.h>
  39 #include <asm/ipc.h>
  40 #include <asm/semaphore.h>
  41
  42 void
  43 check_bugs(void)
  44 {
  45 }
  46
  47 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
  48 {
  49         printk(KERN_ERR "sys_ioperm()\n");
  50         return -EIO;
  51 }
  52
  53 int sys_iopl(int a1, int a2, int a3, int a4)
  54 {
  55         lock_kernel();
  56         printk(KERN_ERR "sys_iopl(%x, %x, %x, %x)!\n", a1, a2, a3, a4);
  57         unlock_kernel();
  58         return (-ENOSYS);
  59 }
  60
  61 int sys_vm86(int a1, int a2, int a3, int a4)
  62 {
  63         lock_kernel();
  64         printk(KERN_ERR "sys_vm86(%x, %x, %x, %x)!\n", a1, a2, a3, a4);
  65         unlock_kernel();
  66         return (-ENOSYS);
  67 }
  68
  69 int sys_modify_ldt(int a1, int a2, int a3, int a4)
  70 {
  71         lock_kernel();
  72         printk(KERN_ERR "sys_modify_ldt(%x, %x, %x, %x)!\n", a1, a2, a3, a4);
  73         unlock_kernel();
  74         return (-ENOSYS);
  75 }
  76
  77 /*
  78  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  79  *
  80  * This is really horribly ugly.
  81  */
  82 asmlinkage int
  83 sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
  84 {
  85         int version, ret;
  86
  87         lock_kernel();
  88         version = call >> 16; /* hack for backward compatibility */
  89         call &= 0xffff;
  90
  91         ret = -EINVAL;
  92         switch (call) {
  93         case SEMOP:
  94                 ret = sys_semop (first, (struct sembuf *)ptr, second);
  95                 break;
  96         case SEMGET:
  97                 ret = sys_semget (first, second, third);
  98                 break;
  99         case SEMCTL: {
 100                 union semun fourth;
 101
 102                 if (!ptr)
 103                         break;
 104                 if ((ret = verify_area (VERIFY_READ, ptr, sizeof(long)))
 105                     || (ret = get_user(fourth.__pad, (void **)ptr)))
 106                         break;
 107                 ret = sys_semctl (first, second, third, fourth);
 108                 break;
 109                 }
 110         case MSGSND:
 111                 ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
 112                 break;
 113         case MSGRCV:
 114                 switch (version) {
 115                 case 0: {
 116                         struct ipc_kludge tmp;
 117
 118                         if (!ptr)
 119                                 break;
 120                         if ((ret = verify_area (VERIFY_READ, ptr, sizeof(tmp)))
 121                             || (ret = copy_from_user(&tmp,
 122                                                 (struct ipc_kludge *) ptr,
 123                                                 sizeof (tmp))))
 124                                 break;
 125                         ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
 126                                           third);
 127                         break;
 128                         }
 129                 default:
 130                         ret = sys_msgrcv (first, (struct msgbuf *) ptr,
 131                                           second, fifth, third);
 132                         break;
 133                 }
 134                 break;
 135         case MSGGET:
 136                 ret = sys_msgget ((key_t) first, second);
 137                 break;
 138         case MSGCTL:
 139                 ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
 140                 break;
 141         case SHMAT:
 142                 switch (version) {
 143                 default: {
 144                         ulong raddr;
 145
 146                         if ((ret = verify_area(VERIFY_WRITE, (ulong*) third,
 147                                                sizeof(ulong))))
 148                                 break;
 149                         ret = sys_shmat (first, (char *) ptr, second, &raddr);
 150                         if (ret)
 151                                 break;
 152                         ret = put_user (raddr, (ulong *) third);
 153                         break;
 154                         }
 155                 case 1: /* iBCS2 emulator entry point */
 156                         if (!segment_eq(get_fs(), get_ds()))
 157                                 break;
 158                         ret = sys_shmat (first, (char *) ptr, second,
 159                                          (ulong *) third);
 160                         break;
 161                 }
 162                 break;
 163         case SHMDT:
 164                 ret = sys_shmdt ((char *)ptr);
 165                 break;
 166         case SHMGET:
 167                 ret = sys_shmget (first, second, third);
 168                 break;
 169         case SHMCTL:
 170                 ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
 171                 break;
 172         }
 173
 174         unlock_kernel();
 175         return ret;
 176 }
 177
 178 /*
 179  * sys_pipe() is the normal C calling standard for creating
 180  * a pipe. It's not the way unix traditionally does this, though.
 181  */
 182 asmlinkage int sys_pipe(int *fildes)
 183 {
 184         int fd[2];
 185         int error;
 186
 187         lock_kernel();
 188         error = do_pipe(fd);
 189         unlock_kernel();
 190         if (!error) {
 191                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
 192                         error = -EFAULT;
 193         }
 194         return error;
 195 }
 196
 197 asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
 198                                   unsigned long prot, unsigned long flags,
 199                                   unsigned long fd, off_t offset)
 200 {
 201         struct file * file = NULL;
 202         int ret = -EBADF;
 203
 204         lock_kernel();
 205         if (!(flags & MAP_ANONYMOUS)) {
 206                 if (!(file = fget(fd)))
 207                         goto out;
 208         }
 209
 210         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 211         down(&current->mm->mmap_sem);
 212         ret = do_mmap(file, addr, len, prot, flags, offset);
 213         up(&current->mm->mmap_sem);
 214         if (file)
 215                 fput(file);
 216 out:
 217         unlock_kernel();
 218         return ret;
 219 }
 220
 221 extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
 222
 223 /*
 224  * Due to some executables calling the wrong select we sometimes
 225  * get wrong args.  This determines how the args are being passed
 226  * (a single ptr to them all args passed) then calls
 227  * sys_select() with the appropriate args. -- Cort
 228  */
 229 asmlinkage int
 230 ppc_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
 231 {
 232         if ( (unsigned long)n >= 4096 )
 233         {
 234                 unsigned long *buffer = (unsigned long *)n;
 235                 if (verify_area(VERIFY_READ, buffer, 5*sizeof(unsigned long))
 236                     || __get_user(n, buffer)
 237                     || __get_user(inp, ((fd_set **)(buffer+1)))
 238                     || __get_user(outp, ((fd_set **)(buffer+2)))
 239                     || __get_user(exp, ((fd_set **)(buffer+3)))
 240                     || __get_user(tvp, ((struct timeval **)(buffer+4))))
 241                         return -EFAULT;
 242         }
 243         return sys_select(n, inp, outp, exp, tvp);
 244 }
 245
 246 asmlinkage int sys_pause(void)
 247 {
 248         current->state = TASK_INTERRUPTIBLE;
 249         schedule();
 250         return -ERESTARTNOHAND;
 251 }
 252
 253 asmlinkage int sys_uname(struct old_utsname * name)
 254 {
 255         if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
 256                 return 0;
 257         return -EFAULT;
 258 }
 259
 260 asmlinkage int sys_olduname(struct oldold_utsname * name)
 261 {
 262         int error;
 263
 264         if (!name)
 265                 return -EFAULT;
 266         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 267                 return -EFAULT;
 268
 269         error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
 270         error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
 271         error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
 272         error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
 273         error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
 274         error -= __put_user(0,name->release+__OLD_UTS_LEN);
 275         error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
 276         error -= __put_user(0,name->version+__OLD_UTS_LEN);
 277         error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
 278         error = __put_user(0,name->machine+__OLD_UTS_LEN);
 279         error = error ? -EFAULT : 0;
 280
 281         return error;
 282 }