arch/ppc64/kernel/syscalls.c

   1 /*
   2  * linux/arch/ppc64/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/syscalls.h>
  26 #include <linux/mm.h>
  27 #include <linux/smp.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/sem.h>
  30 #include <linux/msg.h>
  31 #include <linux/shm.h>
  32 #include <linux/stat.h>
  33 #include <linux/mman.h>
  34 #include <linux/sys.h>
  35 #include <linux/ipc.h>
  36 #include <linux/utsname.h>
  37 #include <linux/file.h>
  38 #include <linux/init.h>
  39 #include <linux/personality.h>
  40
  41 #include <asm/uaccess.h>
  42 #include <asm/ipc.h>
  43 #include <asm/semaphore.h>
  44 #include <asm/time.h>
  45 #include <asm/unistd.h>
  46
  47 extern unsigned long wall_jiffies;
  48
  49
  50 /*
  51  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  52  *
  53  * This is really horribly ugly.
  54  */
  55 asmlinkage int
  56 sys_ipc (uint call, int first, unsigned long second, long third,
  57          void __user *ptr, long fifth)
  58 {
  59         int version, ret;
  60
  61         version = call >> 16; /* hack for backward compatibility */
  62         call &= 0xffff;
  63
  64         ret = -ENOSYS;
  65         switch (call) {
  66         case SEMOP:
  67                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  68                                       (unsigned)second, NULL);
  69                 break;
  70         case SEMTIMEDOP:
  71                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  72                                       (unsigned)second,
  73                                       (const struct timespec __user *) fifth);
  74                 break;
  75         case SEMGET:
  76                 ret = sys_semget (first, (int)second, third);
  77                 break;
  78         case SEMCTL: {
  79                 union semun fourth;
  80
  81                 ret = -EINVAL;
  82                 if (!ptr)
  83                         break;
  84                 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
  85                         break;
  86                 ret = sys_semctl(first, (int)second, third, fourth);
  87                 break;
  88         }
  89         case MSGSND:
  90                 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
  91                                   (size_t)second, third);
  92                 break;
  93         case MSGRCV:
  94                 switch (version) {
  95                 case 0: {
  96                         struct ipc_kludge tmp;
  97
  98                         ret = -EINVAL;
  99                         if (!ptr)
 100                                 break;
 101                         if ((ret = copy_from_user(&tmp,
 102                                                 (struct ipc_kludge __user *) ptr,
 103                                                 sizeof (tmp)) ? -EFAULT : 0))
 104                                 break;
 105                         ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
 106                                           tmp.msgtyp, third);
 107                         break;
 108                 }
 109                 default:
 110                         ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
 111                                           (size_t)second, fifth, third);
 112                         break;
 113                 }
 114                 break;
 115         case MSGGET:
 116                 ret = sys_msgget ((key_t)first, (int)second);
 117                 break;
 118         case MSGCTL:
 119                 ret = sys_msgctl(first, (int)second,
 120                                   (struct msqid_ds __user *)ptr);
 121                 break;
 122         case SHMAT:
 123                 switch (version) {
 124                 default: {
 125                         ulong raddr;
 126                         ret = do_shmat(first, (char __user *) ptr,
 127                                         (int)second, &raddr);
 128                         if (ret)
 129                                 break;
 130                         ret = put_user (raddr, (ulong __user *) third);
 131                         break;
 132                 }
 133                 case 1: /* iBCS2 emulator entry point */
 134                         ret = -EINVAL;
 135                         if (!segment_eq(get_fs(), get_ds()))
 136                                 break;
 137                         ret = do_shmat(first, (char __user *)ptr,
 138                                         (int)second, (ulong *)third);
 139                         break;
 140                 }
 141                 break;
 142         case SHMDT:
 143                 ret = sys_shmdt ((char __user *)ptr);
 144                 break;
 145         case SHMGET:
 146                 ret = sys_shmget (first, (size_t)second, third);
 147                 break;
 148         case SHMCTL:
 149                 ret = sys_shmctl(first, (int)second,
 150                                   (struct shmid_ds __user *)ptr);
 151                 break;
 152         }
 153
 154         return ret;
 155 }
 156
 157 /*
 158  * sys_pipe() is the normal C calling standard for creating
 159  * a pipe. It's not the way unix traditionally does this, though.
 160  */
 161 asmlinkage int sys_pipe(int __user *fildes)
 162 {
 163         int fd[2];
 164         int error;
 165
 166         error = do_pipe(fd);
 167         if (!error) {
 168                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
 169                         error = -EFAULT;
 170         }
 171
 172         return error;
 173 }
 174
 175 unsigned long sys_mmap(unsigned long addr, size_t len,
 176                        unsigned long prot, unsigned long flags,
 177                        unsigned long fd, off_t offset)
 178 {
 179         struct file * file = NULL;
 180         unsigned long ret = -EBADF;
 181
 182         if (!(flags & MAP_ANONYMOUS)) {
 183                 if (!(file = fget(fd)))
 184                         goto out;
 185         }
 186
 187         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 188         down_write(&current->mm->mmap_sem);
 189         ret = do_mmap(file, addr, len, prot, flags, offset);
 190         up_write(&current->mm->mmap_sem);
 191         if (file)
 192                 fput(file);
 193
 194 out:
 195         return ret;
 196 }
 197
 198 long ppc64_personality(unsigned long personality)
 199 {
 200         long ret;
 201
 202         if (personality(current->personality) == PER_LINUX32
 203             && personality == PER_LINUX)
 204                 personality = PER_LINUX32;
 205         ret = sys_personality(personality);
 206         if (ret == PER_LINUX32)
 207                 ret = PER_LINUX;
 208         return ret;
 209 }
 210
 211 long ppc64_newuname(struct new_utsname __user * name)
 212 {
 213         int err = 0;
 214
 215         down_read(&uts_sem);
 216         if (copy_to_user(name, &system_utsname, sizeof(*name)))
 217                 err = -EFAULT;
 218         up_read(&uts_sem);
 219         if (!err && personality(current->personality) == PER_LINUX32) {
 220                 /* change ppc64 to ppc */
 221                 if (__put_user(0, name->machine + 3)
 222                     || __put_user(0, name->machine + 4))
 223                         err = -EFAULT;
 224         }
 225         return err;
 226 }
 227
 228 asmlinkage time_t sys64_time(time_t __user * tloc)
 229 {
 230         time_t secs;
 231         time_t usecs;
 232
 233         long tb_delta = tb_ticks_since(tb_last_stamp);
 234         tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
 235
 236         secs  = xtime.tv_sec;
 237         usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
 238         while (usecs >= USEC_PER_SEC) {
 239                 ++secs;
 240                 usecs -= USEC_PER_SEC;
 241         }
 242
 243         if (tloc) {
 244                 if (put_user(secs,tloc))
 245                         secs = -EFAULT;
 246         }
 247
 248         return secs;
 249 }
 250
 251 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
 252                      unsigned long r6, unsigned long r7, unsigned long r8,
 253                      struct pt_regs *regs)
 254 {
 255         printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
 256                " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
 257                current, smp_processor_id());
 258 }
 259
 260 void do_show_syscall_exit(unsigned long r3)
 261 {
 262         printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
 263 }