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