arch/powerpc/kernel/syscalls.c

   1 /*
   2  *  Implementation of various system calls for Linux/PowerPC
   3  *
   4  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   5  *
   6  * Derived from "arch/i386/kernel/sys_i386.c"
   7  * Adapted from the i386 version by Gary Thomas
   8  * Modified by Cort Dougan (cort@cs.nmt.edu)
   9  * and Paul Mackerras (paulus@cs.anu.edu.au).
  10  *
  11  * This file contains various random system calls that
  12  * have a non-standard calling sequence on the Linux/PPC
  13  * platform.
  14  *
  15  *  This program is free software; you can redistribute it and/or
  16  *  modify it under the terms of the GNU General Public License
  17  *  as published by the Free Software Foundation; either version
  18  *  2 of the License, or (at your option) any later version.
  19  *
  20  */
  21
  22 #include <linux/errno.h>
  23 #include <linux/sched.h>
  24 #include <linux/syscalls.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/time.h>
  44 #include <asm/unistd.h>
  45
  46 extern unsigned long wall_jiffies;
  47
  48
  49 /*
  50  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  51  *
  52  * This is really horribly ugly.
  53  */
  54 int sys_ipc(uint call, int first, unsigned long second, long third,
  55             void __user *ptr, long fifth)
  56 {
  57         int version, ret;
  58
  59         version = call >> 16; /* hack for backward compatibility */
  60         call &= 0xffff;
  61
  62         ret = -ENOSYS;
  63         switch (call) {
  64         case SEMOP:
  65                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  66                                       (unsigned)second, NULL);
  67                 break;
  68         case SEMTIMEDOP:
  69                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  70                                       (unsigned)second,
  71                                       (const struct timespec __user *) fifth);
  72                 break;
  73         case SEMGET:
  74                 ret = sys_semget (first, (int)second, third);
  75                 break;
  76         case SEMCTL: {
  77                 union semun fourth;
  78
  79                 ret = -EINVAL;
  80                 if (!ptr)
  81                         break;
  82                 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
  83                         break;
  84                 ret = sys_semctl(first, (int)second, third, fourth);
  85                 break;
  86         }
  87         case MSGSND:
  88                 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
  89                                  (size_t)second, third);
  90                 break;
  91         case MSGRCV:
  92                 switch (version) {
  93                 case 0: {
  94                         struct ipc_kludge tmp;
  95
  96                         ret = -EINVAL;
  97                         if (!ptr)
  98                                 break;
  99                         if ((ret = copy_from_user(&tmp,
 100                                                 (struct ipc_kludge __user *) ptr,
 101                                                 sizeof (tmp)) ? -EFAULT : 0))
 102                                 break;
 103                         ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
 104                                           tmp.msgtyp, third);
 105                         break;
 106                 }
 107                 default:
 108                         ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
 109                                           (size_t)second, fifth, third);
 110                         break;
 111                 }
 112                 break;
 113         case MSGGET:
 114                 ret = sys_msgget((key_t)first, (int)second);
 115                 break;
 116         case MSGCTL:
 117                 ret = sys_msgctl(first, (int)second,
 118                                   (struct msqid_ds __user *)ptr);
 119                 break;
 120         case SHMAT: {
 121                 ulong raddr;
 122                 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
 123                 if (ret)
 124                         break;
 125                 ret = put_user(raddr, (ulong __user *) third);
 126                 break;
 127         }
 128         case SHMDT:
 129                 ret = sys_shmdt((char __user *)ptr);
 130                 break;
 131         case SHMGET:
 132                 ret = sys_shmget(first, (size_t)second, third);
 133                 break;
 134         case SHMCTL:
 135                 ret = sys_shmctl(first, (int)second,
 136                                  (struct shmid_ds __user *)ptr);
 137                 break;
 138         }
 139
 140         return ret;
 141 }
 142
 143 /*
 144  * sys_pipe() is the normal C calling standard for creating
 145  * a pipe. It's not the way unix traditionally does this, though.
 146  */
 147 int sys_pipe(int __user *fildes)
 148 {
 149         int fd[2];
 150         int error;
 151
 152         error = do_pipe(fd);
 153         if (!error) {
 154                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
 155                         error = -EFAULT;
 156         }
 157         return error;
 158 }
 159
 160 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
 161                         unsigned long prot, unsigned long flags,
 162                         unsigned long fd, unsigned long off, int shift)
 163 {
 164         struct file * file = NULL;
 165         unsigned long ret = -EINVAL;
 166
 167         if (shift) {
 168                 if (off & ((1 << shift) - 1))
 169                         goto out;
 170                 off >>= shift;
 171         }
 172
 173         ret = -EBADF;
 174         if (!(flags & MAP_ANONYMOUS)) {
 175                 if (!(file = fget(fd)))
 176                         goto out;
 177         }
 178
 179         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 180
 181         down_write(&current->mm->mmap_sem);
 182         ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
 183         up_write(&current->mm->mmap_sem);
 184         if (file)
 185                 fput(file);
 186 out:
 187         return ret;
 188 }
 189
 190 unsigned long sys_mmap2(unsigned long addr, size_t len,
 191                         unsigned long prot, unsigned long flags,
 192                         unsigned long fd, unsigned long pgoff)
 193 {
 194         return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
 195 }
 196
 197 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         return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
 202 }
 203
 204 #ifdef CONFIG_PPC32
 205 /*
 206  * Due to some executables calling the wrong select we sometimes
 207  * get wrong args.  This determines how the args are being passed
 208  * (a single ptr to them all args passed) then calls
 209  * sys_select() with the appropriate args. -- Cort
 210  */
 211 int
 212 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
 213 {
 214         if ( (unsigned long)n >= 4096 )
 215         {
 216                 unsigned long __user *buffer = (unsigned long __user *)n;
 217                 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
 218                     || __get_user(n, buffer)
 219                     || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
 220                     || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
 221                     || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
 222                     || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
 223                         return -EFAULT;
 224         }
 225         return sys_select(n, inp, outp, exp, tvp);
 226 }
 227 #endif
 228
 229 #ifdef CONFIG_PPC64
 230 long ppc64_personality(unsigned long personality)
 231 {
 232         long ret;
 233
 234         if (personality(current->personality) == PER_LINUX32
 235             && personality == PER_LINUX)
 236                 personality = PER_LINUX32;
 237         ret = sys_personality(personality);
 238         if (ret == PER_LINUX32)
 239                 ret = PER_LINUX;
 240         return ret;
 241 }
 242 #endif
 243
 244 #ifdef CONFIG_PPC64
 245 #define OVERRIDE_MACHINE    (personality(current->personality) == PER_LINUX32)
 246 #else
 247 #define OVERRIDE_MACHINE    0
 248 #endif
 249
 250 static inline int override_machine(char *mach)
 251 {
 252         if (OVERRIDE_MACHINE) {
 253                 /* change ppc64 to ppc */
 254                 if (__put_user(0, mach+3) || __put_user(0, mach+4))
 255                         return -EFAULT;
 256         }
 257         return 0;
 258 }
 259
 260 long ppc_newuname(struct new_utsname __user * name)
 261 {
 262         int err = 0;
 263
 264         down_read(&uts_sem);
 265         if (copy_to_user(name, &system_utsname, sizeof(*name)))
 266                 err = -EFAULT;
 267         up_read(&uts_sem);
 268         if (!err)
 269                 err = override_machine(name->machine);
 270         return err;
 271 }
 272
 273 int sys_uname(struct old_utsname __user *name)
 274 {
 275         int err = 0;
 276
 277         down_read(&uts_sem);
 278         if (copy_to_user(name, &system_utsname, sizeof(*name)))
 279                 err = -EFAULT;
 280         up_read(&uts_sem);
 281         if (!err)
 282                 err = override_machine(name->machine);
 283         return err;
 284 }
 285
 286 int sys_olduname(struct oldold_utsname __user *name)
 287 {
 288         int error;
 289
 290         if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
 291                 return -EFAULT;
 292
 293         down_read(&uts_sem);
 294         error = __copy_to_user(&name->sysname, &system_utsname.sysname,
 295                                __OLD_UTS_LEN);
 296         error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
 297         error |= __copy_to_user(&name->nodename, &system_utsname.nodename,
 298                                 __OLD_UTS_LEN);
 299         error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
 300         error |= __copy_to_user(&name->release, &system_utsname.release,
 301                                 __OLD_UTS_LEN);
 302         error |= __put_user(0, name->release + __OLD_UTS_LEN);
 303         error |= __copy_to_user(&name->version, &system_utsname.version,
 304                                 __OLD_UTS_LEN);
 305         error |= __put_user(0, name->version + __OLD_UTS_LEN);
 306         error |= __copy_to_user(&name->machine, &system_utsname.machine,
 307                                 __OLD_UTS_LEN);
 308         error |= override_machine(name->machine);
 309         up_read(&uts_sem);
 310
 311         return error? -EFAULT: 0;
 312 }
 313
 314 #ifdef CONFIG_PPC64
 315 time_t sys64_time(time_t __user * tloc)
 316 {
 317         time_t secs;
 318         time_t usecs;
 319
 320         long tb_delta = tb_ticks_since(tb_last_stamp);
 321         tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
 322
 323         secs  = xtime.tv_sec;
 324         usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
 325         while (usecs >= USEC_PER_SEC) {
 326                 ++secs;
 327                 usecs -= USEC_PER_SEC;
 328         }
 329
 330         if (tloc) {
 331                 if (put_user(secs,tloc))
 332                         secs = -EFAULT;
 333         }
 334
 335         return secs;
 336 }
 337 #endif
 338
 339 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 340                       u32 len_high, u32 len_low)
 341 {
 342         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
 343                              (u64)len_high << 32 | len_low, advice);
 344 }
 345
 346 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
 347                      unsigned long r6, unsigned long r7, unsigned long r8,
 348                      struct pt_regs *regs)
 349 {
 350         printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
 351                " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
 352                current, smp_processor_id());
 353 }
 354
 355 void do_show_syscall_exit(unsigned long r3)
 356 {
 357         printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
 358 }