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 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
 140                         unsigned long prot, unsigned long flags,
 141                         unsigned long fd, unsigned long off, int shift)
 142 {
 143         struct file * file = NULL;
 144         unsigned long ret = -EINVAL;
 145
 146         if (!arch_validate_prot(prot))
 147                 goto out;
 148
 149         if (shift) {
 150                 if (off & ((1 << shift) - 1))
 151                         goto out;
 152                 off >>= shift;
 153         }
 154
 155         ret = -EBADF;
 156         if (!(flags & MAP_ANONYMOUS)) {
 157                 if (!(file = fget(fd)))
 158                         goto out;
 159         }
 160
 161         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 162
 163         down_write(&current->mm->mmap_sem);
 164         ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
 165         up_write(&current->mm->mmap_sem);
 166         if (file)
 167                 fput(file);
 168 out:
 169         return ret;
 170 }
 171
 172 unsigned long sys_mmap2(unsigned long addr, size_t len,
 173                         unsigned long prot, unsigned long flags,
 174                         unsigned long fd, unsigned long pgoff)
 175 {
 176         return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
 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         return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
 184 }
 185
 186 #ifdef CONFIG_PPC32
 187 /*
 188  * Due to some executables calling the wrong select we sometimes
 189  * get wrong args.  This determines how the args are being passed
 190  * (a single ptr to them all args passed) then calls
 191  * sys_select() with the appropriate args. -- Cort
 192  */
 193 int
 194 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
 195 {
 196         if ( (unsigned long)n >= 4096 )
 197         {
 198                 unsigned long __user *buffer = (unsigned long __user *)n;
 199                 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
 200                     || __get_user(n, buffer)
 201                     || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
 202                     || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
 203                     || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
 204                     || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
 205                         return -EFAULT;
 206         }
 207         return sys_select(n, inp, outp, exp, tvp);
 208 }
 209 #endif
 210
 211 #ifdef CONFIG_PPC64
 212 long ppc64_personality(unsigned long personality)
 213 {
 214         long ret;
 215
 216         if (personality(current->personality) == PER_LINUX32
 217             && personality == PER_LINUX)
 218                 personality = PER_LINUX32;
 219         ret = sys_personality(personality);
 220         if (ret == PER_LINUX32)
 221                 ret = PER_LINUX;
 222         return ret;
 223 }
 224 #endif
 225
 226 #ifdef CONFIG_PPC64
 227 #define OVERRIDE_MACHINE    (personality(current->personality) == PER_LINUX32)
 228 #else
 229 #define OVERRIDE_MACHINE    0
 230 #endif
 231
 232 static inline int override_machine(char __user *mach)
 233 {
 234         if (OVERRIDE_MACHINE) {
 235                 /* change ppc64 to ppc */
 236                 if (__put_user(0, mach+3) || __put_user(0, mach+4))
 237                         return -EFAULT;
 238         }
 239         return 0;
 240 }
 241
 242 long ppc_newuname(struct new_utsname __user * name)
 243 {
 244         int err = 0;
 245
 246         down_read(&uts_sem);
 247         if (copy_to_user(name, utsname(), sizeof(*name)))
 248                 err = -EFAULT;
 249         up_read(&uts_sem);
 250         if (!err)
 251                 err = override_machine(name->machine);
 252         return err;
 253 }
 254
 255 int sys_uname(struct old_utsname __user *name)
 256 {
 257         int err = 0;
 258
 259         down_read(&uts_sem);
 260         if (copy_to_user(name, utsname(), sizeof(*name)))
 261                 err = -EFAULT;
 262         up_read(&uts_sem);
 263         if (!err)
 264                 err = override_machine(name->machine);
 265         return err;
 266 }
 267
 268 int sys_olduname(struct oldold_utsname __user *name)
 269 {
 270         int error;
 271
 272         if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
 273                 return -EFAULT;
 274
 275         down_read(&uts_sem);
 276         error = __copy_to_user(&name->sysname, &utsname()->sysname,
 277                                __OLD_UTS_LEN);
 278         error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
 279         error |= __copy_to_user(&name->nodename, &utsname()->nodename,
 280                                 __OLD_UTS_LEN);
 281         error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
 282         error |= __copy_to_user(&name->release, &utsname()->release,
 283                                 __OLD_UTS_LEN);
 284         error |= __put_user(0, name->release + __OLD_UTS_LEN);
 285         error |= __copy_to_user(&name->version, &utsname()->version,
 286                                 __OLD_UTS_LEN);
 287         error |= __put_user(0, name->version + __OLD_UTS_LEN);
 288         error |= __copy_to_user(&name->machine, &utsname()->machine,
 289                                 __OLD_UTS_LEN);
 290         error |= override_machine(name->machine);
 291         up_read(&uts_sem);
 292
 293         return error? -EFAULT: 0;
 294 }
 295
 296 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 297                       u32 len_high, u32 len_low)
 298 {
 299         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
 300                              (u64)len_high << 32 | len_low, advice);
 301 }
 302
 303 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
 304                      unsigned long r6, unsigned long r7, unsigned long r8,
 305                      struct pt_regs *regs)
 306 {
 307         printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
 308                " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
 309                current, smp_processor_id());
 310 }
 311
 312 void do_show_syscall_exit(unsigned long r3)
 313 {
 314         printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
 315 }