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/fs.h>
  27 #include <linux/smp.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/syscalls.h>
  42 #include <asm/time.h>
  43 #include <asm/unistd.h>
  44
  45 /*
  46  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  47  *
  48  * This is really horribly ugly.
  49  */
  50 int sys_ipc(uint call, int first, unsigned long second, long third,
  51             void __user *ptr, long fifth)
  52 {
  53         int version, ret;
  54
  55         version = call >> 16; /* hack for backward compatibility */
  56         call &= 0xffff;
  57
  58         ret = -ENOSYS;
  59         switch (call) {
  60         case SEMOP:
  61                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  62                                       (unsigned)second, NULL);
  63                 break;
  64         case SEMTIMEDOP:
  65                 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
  66                                       (unsigned)second,
  67                                       (const struct timespec __user *) fifth);
  68                 break;
  69         case SEMGET:
  70                 ret = sys_semget (first, (int)second, third);
  71                 break;
  72         case SEMCTL: {
  73                 union semun fourth;
  74
  75                 ret = -EINVAL;
  76                 if (!ptr)
  77                         break;
  78                 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
  79                         break;
  80                 ret = sys_semctl(first, (int)second, third, fourth);
  81                 break;
  82         }
  83         case MSGSND:
  84                 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
  85                                  (size_t)second, third);
  86                 break;
  87         case MSGRCV:
  88                 switch (version) {
  89                 case 0: {
  90                         struct ipc_kludge tmp;
  91
  92                         ret = -EINVAL;
  93                         if (!ptr)
  94                                 break;
  95                         if ((ret = copy_from_user(&tmp,
  96                                                 (struct ipc_kludge __user *) ptr,
  97                                                 sizeof (tmp)) ? -EFAULT : 0))
  98                                 break;
  99                         ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
 100                                           tmp.msgtyp, third);
 101                         break;
 102                 }
 103                 default:
 104                         ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
 105                                           (size_t)second, fifth, third);
 106                         break;
 107                 }
 108                 break;
 109         case MSGGET:
 110                 ret = sys_msgget((key_t)first, (int)second);
 111                 break;
 112         case MSGCTL:
 113                 ret = sys_msgctl(first, (int)second,
 114                                   (struct msqid_ds __user *)ptr);
 115                 break;
 116         case SHMAT: {
 117                 ulong raddr;
 118                 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
 119                 if (ret)
 120                         break;
 121                 ret = put_user(raddr, (ulong __user *) third);
 122                 break;
 123         }
 124         case SHMDT:
 125                 ret = sys_shmdt((char __user *)ptr);
 126                 break;
 127         case SHMGET:
 128                 ret = sys_shmget(first, (size_t)second, third);
 129                 break;
 130         case SHMCTL:
 131                 ret = sys_shmctl(first, (int)second,
 132                                  (struct shmid_ds __user *)ptr);
 133                 break;
 134         }
 135
 136         return ret;
 137 }
 138
 139 /*
 140  * sys_pipe() is the normal C calling standard for creating
 141  * a pipe. It's not the way unix traditionally does this, though.
 142  */
 143 int sys_pipe(int __user *fildes)
 144 {
 145         int fd[2];
 146         int error;
 147
 148         error = do_pipe(fd);
 149         if (!error) {
 150                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
 151                         error = -EFAULT;
 152         }
 153         return error;
 154 }
 155
 156 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
 157                         unsigned long prot, unsigned long flags,
 158                         unsigned long fd, unsigned long off, int shift)
 159 {
 160         struct file * file = NULL;
 161         unsigned long ret = -EINVAL;
 162
 163         if (shift) {
 164                 if (off & ((1 << shift) - 1))
 165                         goto out;
 166                 off >>= shift;
 167         }
 168
 169         ret = -EBADF;
 170         if (!(flags & MAP_ANONYMOUS)) {
 171                 if (!(file = fget(fd)))
 172                         goto out;
 173         }
 174
 175         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 176
 177         down_write(&current->mm->mmap_sem);
 178         ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
 179         up_write(&current->mm->mmap_sem);
 180         if (file)
 181                 fput(file);
 182 out:
 183         return ret;
 184 }
 185
 186 unsigned long sys_mmap2(unsigned long addr, size_t len,
 187                         unsigned long prot, unsigned long flags,
 188                         unsigned long fd, unsigned long pgoff)
 189 {
 190         return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
 191 }
 192
 193 unsigned long sys_mmap(unsigned long addr, size_t len,
 194                        unsigned long prot, unsigned long flags,
 195                        unsigned long fd, off_t offset)
 196 {
 197         return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
 198 }
 199
 200 #ifdef CONFIG_PPC32
 201 /*
 202  * Due to some executables calling the wrong select we sometimes
 203  * get wrong args.  This determines how the args are being passed
 204  * (a single ptr to them all args passed) then calls
 205  * sys_select() with the appropriate args. -- Cort
 206  */
 207 int
 208 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
 209 {
 210         if ( (unsigned long)n >= 4096 )
 211         {
 212                 unsigned long __user *buffer = (unsigned long __user *)n;
 213                 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
 214                     || __get_user(n, buffer)
 215                     || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
 216                     || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
 217                     || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
 218                     || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
 219                         return -EFAULT;
 220         }
 221         return sys_select(n, inp, outp, exp, tvp);
 222 }
 223 #endif
 224
 225 #ifdef CONFIG_PPC64
 226 long ppc64_personality(unsigned long personality)
 227 {
 228         long ret;
 229
 230         if (personality(current->personality) == PER_LINUX32
 231             && personality == PER_LINUX)
 232                 personality = PER_LINUX32;
 233         ret = sys_personality(personality);
 234         if (ret == PER_LINUX32)
 235                 ret = PER_LINUX;
 236         return ret;
 237 }
 238 #endif
 239
 240 #ifdef CONFIG_PPC64
 241 #define OVERRIDE_MACHINE    (personality(current->personality) == PER_LINUX32)
 242 #else
 243 #define OVERRIDE_MACHINE    0
 244 #endif
 245
 246 static inline int override_machine(char __user *mach)
 247 {
 248         if (OVERRIDE_MACHINE) {
 249                 /* change ppc64 to ppc */
 250                 if (__put_user(0, mach+3) || __put_user(0, mach+4))
 251                         return -EFAULT;
 252         }
 253         return 0;
 254 }
 255
 256 long ppc_newuname(struct new_utsname __user * name)
 257 {
 258         int err = 0;
 259
 260         down_read(&uts_sem);
 261         if (copy_to_user(name, utsname(), sizeof(*name)))
 262                 err = -EFAULT;
 263         up_read(&uts_sem);
 264         if (!err)
 265                 err = override_machine(name->machine);
 266         return err;
 267 }
 268
 269 int sys_uname(struct old_utsname __user *name)
 270 {
 271         int err = 0;
 272
 273         down_read(&uts_sem);
 274         if (copy_to_user(name, utsname(), sizeof(*name)))
 275                 err = -EFAULT;
 276         up_read(&uts_sem);
 277         if (!err)
 278                 err = override_machine(name->machine);
 279         return err;
 280 }
 281
 282 int sys_olduname(struct oldold_utsname __user *name)
 283 {
 284         int error;
 285
 286         if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
 287                 return -EFAULT;
 288
 289         down_read(&uts_sem);
 290         error = __copy_to_user(&name->sysname, &utsname()->sysname,
 291                                __OLD_UTS_LEN);
 292         error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
 293         error |= __copy_to_user(&name->nodename, &utsname()->nodename,
 294                                 __OLD_UTS_LEN);
 295         error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
 296         error |= __copy_to_user(&name->release, &utsname()->release,
 297                                 __OLD_UTS_LEN);
 298         error |= __put_user(0, name->release + __OLD_UTS_LEN);
 299         error |= __copy_to_user(&name->version, &utsname()->version,
 300                                 __OLD_UTS_LEN);
 301         error |= __put_user(0, name->version + __OLD_UTS_LEN);
 302         error |= __copy_to_user(&name->machine, &utsname()->machine,
 303                                 __OLD_UTS_LEN);
 304         error |= override_machine(name->machine);
 305         up_read(&uts_sem);
 306
 307         return error? -EFAULT: 0;
 308 }
 309
 310 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 311                       u32 len_high, u32 len_low)
 312 {
 313         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
 314                              (u64)len_high << 32 | len_low, advice);
 315 }
 316
 317 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
 318                      unsigned long r6, unsigned long r7, unsigned long r8,
 319                      struct pt_regs *regs)
 320 {
 321         printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
 322                " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
 323                current, smp_processor_id());
 324 }
 325
 326 void do_show_syscall_exit(unsigned long r3)
 327 {
 328         printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
 329 }