arch/ppc64/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 #include <linux/init.h>
  38 #include <linux/personality.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/ipc.h>
  42 #include <asm/semaphore.h>
  43 #include <asm/ppcdebug.h>
  44
  45 #include <asm/time.h>
  46
  47 extern unsigned long wall_jiffies;
  48 #define USEC_PER_SEC (1000000)
  49
  50 void
  51 check_bugs(void)
  52 {
  53 }
  54
  55 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
  56 {
  57         return -EIO;
  58 }
  59
  60 /*
  61  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  62  *
  63  * This is really horribly ugly.
  64  */
  65 asmlinkage int
  66 sys_ipc (uint call, int first, int second, long third, void *ptr, long fifth)
  67 {
  68         int version, ret;
  69
  70         PPCDBG(PPCDBG_SYS64X, "sys_ipc - entered - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
  71
  72         version = call >> 16; /* hack for backward compatibility */
  73         call &= 0xffff;
  74
  75         ret = -ENOSYS;
  76         switch (call) {
  77         case SEMOP:
  78                 ret = sys_semop (first, (struct sembuf *)ptr, second);
  79                 break;
  80         case SEMGET:
  81                 ret = sys_semget (first, second, third);
  82                 break;
  83         case SEMCTL: {
  84                 union semun fourth;
  85
  86                 if (!ptr)
  87                         break;
  88                 if ((ret = verify_area (VERIFY_READ, ptr, sizeof(long)))
  89                     || (ret = get_user(fourth.__pad, (void **)ptr)))
  90                         break;
  91                 ret = sys_semctl (first, second, third, fourth);
  92                 break;
  93         }
  94         case MSGSND:
  95                 ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
  96                 break;
  97         case MSGRCV:
  98                 switch (version) {
  99                 case 0: {
 100                         struct ipc_kludge tmp;
 101
 102                         if (!ptr)
 103                                 break;
 104                         if ((ret = verify_area (VERIFY_READ, ptr, sizeof(tmp)))
 105                             || (ret = copy_from_user(&tmp,
 106                                                 (struct ipc_kludge *) ptr,
 107                                                 sizeof (tmp))))
 108                                 break;
 109                         ret = sys_msgrcv (first, (struct msgbuf *)tmp.msgp,
 110                                                 second, tmp.msgtyp, third);
 111                         break;
 112                 }
 113                 default:
 114                         ret = sys_msgrcv (first, (struct msgbuf *) ptr,
 115                                           second, fifth, third);
 116                         break;
 117                 }
 118                 break;
 119         case MSGGET:
 120                 ret = sys_msgget ((key_t) first, second);
 121                 break;
 122         case MSGCTL:
 123                 ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
 124                 break;
 125         case SHMAT:
 126                 switch (version) {
 127                 default: {
 128                         ulong raddr;
 129
 130                         if ((ret = verify_area(VERIFY_WRITE, (ulong*) third,
 131                                                sizeof(ulong))))
 132                                 break;
 133                         ret = sys_shmat (first, (char *) ptr, second, &raddr);
 134                         if (ret)
 135                                 break;
 136                         ret = put_user (raddr, (ulong *) third);
 137                         break;
 138                 }
 139                 case 1: /* iBCS2 emulator entry point */
 140                         if (!segment_eq(get_fs(), get_ds()))
 141                                 break;
 142                         ret = sys_shmat (first, (char *) ptr, second,
 143                                          (ulong *) third);
 144                         break;
 145                 }
 146                 break;
 147         case SHMDT:
 148                 ret = sys_shmdt ((char *)ptr);
 149                 break;
 150         case SHMGET:
 151                 ret = sys_shmget (first, second, third);
 152                 break;
 153         case SHMCTL:
 154                 ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
 155                 break;
 156         }
 157
 158         PPCDBG(PPCDBG_SYS64X, "sys_ipc - exited - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 159         return ret;
 160 }
 161
 162 /*
 163  * sys_pipe() is the normal C calling standard for creating
 164  * a pipe. It's not the way unix traditionally does this, though.
 165  */
 166 asmlinkage int sys_pipe(int *fildes)
 167 {
 168         int fd[2];
 169         int error;
 170
 171         PPCDBG(PPCDBG_SYS64X, "sys_pipe - entered - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 172
 173         error = do_pipe(fd);
 174         if (!error) {
 175                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
 176                         error = -EFAULT;
 177         }
 178
 179         PPCDBG(PPCDBG_SYS64X, "sys_pipe - exited - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 180         return error;
 181 }
 182
 183 asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
 184                                   unsigned long prot, unsigned long flags,
 185                                   unsigned long fd, off_t offset)
 186 {
 187         struct file * file = NULL;
 188         unsigned long ret = -EBADF;
 189
 190         PPCDBG(PPCDBG_SYS64X, "sys_mmap - entered - addr=%lx, len=%lx - pid=%ld, comm=%s \n", addr, len, current->pid, current->comm);
 191
 192         if (!(flags & MAP_ANONYMOUS)) {
 193                 if (!(file = fget(fd)))
 194                         goto out;
 195         }
 196
 197         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 198         down_write(&current->mm->mmap_sem);
 199         ret = do_mmap(file, addr, len, prot, flags, offset);
 200         up_write(&current->mm->mmap_sem);
 201         if (file)
 202                 fput(file);
 203
 204 out:
 205
 206         PPCDBG(PPCDBG_SYS64X, "sys_mmap - exited - ret=%x \n", ret);
 207
 208         return ret;
 209 }
 210
 211 asmlinkage int sys_pause(void)
 212 {
 213
 214         PPCDBG(PPCDBG_SYS64X, "sys_pause - entered - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 215         current->state = TASK_INTERRUPTIBLE;
 216         schedule();
 217
 218         PPCDBG(PPCDBG_SYS64X, "sys_pause - exited - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 219         return -ERESTARTNOHAND;
 220 }
 221
 222 static int __init set_fakeppc(char *str)
 223 {
 224         if (*str)
 225                 return 0;
 226         init_task.personality = PER_LINUX32;
 227         return 1;
 228 }
 229 __setup("fakeppc", set_fakeppc);
 230
 231 asmlinkage int sys_uname(struct old_utsname * name)
 232 {
 233         int err = -EFAULT;
 234
 235         PPCDBG(PPCDBG_SYS64X, "sys_uname - entered - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 236
 237         down_read(&uts_sem);
 238         if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
 239                 err = 0;
 240         up_read(&uts_sem);
 241
 242         PPCDBG(PPCDBG_SYS64X, "sys_uname - exited - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 243         return err;
 244 }
 245
 246 asmlinkage int sys_olduname(struct oldold_utsname * name)
 247 {
 248         int error;
 249
 250         PPCDBG(PPCDBG_SYS64X, "sys_olduname - entered - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 251
 252         if (!name)
 253                 return -EFAULT;
 254         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 255                 return -EFAULT;
 256
 257         down_read(&uts_sem);
 258         error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
 259         error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
 260         error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
 261         error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
 262         error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
 263         error -= __put_user(0,name->release+__OLD_UTS_LEN);
 264         error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
 265         error -= __put_user(0,name->version+__OLD_UTS_LEN);
 266         error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
 267         error = __put_user(0,name->machine+__OLD_UTS_LEN);
 268         up_read(&uts_sem);
 269
 270         error = error ? -EFAULT : 0;
 271
 272         PPCDBG(PPCDBG_SYS64X, "sys_olduname - exited - pid=%ld current=%lx comm=%s \n", current->pid, current, current->comm);
 273         return error;
 274 }
 275
 276 asmlinkage time_t sys64_time(time_t* tloc)
 277 {
 278         time_t secs;
 279         time_t usecs;
 280
 281         long tb_delta = tb_ticks_since(tb_last_stamp);
 282         tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
 283
 284         secs  = xtime.tv_sec;
 285         usecs = xtime.tv_usec + tb_delta / tb_ticks_per_usec;
 286         while (usecs >= USEC_PER_SEC) {
 287                 ++secs;
 288                 usecs -= USEC_PER_SEC;
 289         }
 290
 291         if (tloc) {
 292                 if (put_user(secs,tloc))
 293                         secs = -EFAULT;
 294         }
 295
 296         return secs;
 297 }