arch/mips/kernel/linux32.c

   1 /*
   2  * Conversion between 32-bit and 64-bit native system calls.
   3  *
   4  * Copyright (C) 2000 Silicon Graphics, Inc.
   5  * Written by Ulf Carlsson (ulfc@engr.sgi.com)
   6  * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
   7  */
   8 #include <linux/compiler.h>
   9 #include <linux/mm.h>
  10 #include <linux/errno.h>
  11 #include <linux/file.h>
  12 #include <linux/smp_lock.h>
  13 #include <linux/highuid.h>
  14 #include <linux/resource.h>
  15 #include <linux/highmem.h>
  16 #include <linux/time.h>
  17 #include <linux/times.h>
  18 #include <linux/poll.h>
  19 #include <linux/slab.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/filter.h>
  22 #include <linux/shm.h>
  23 #include <linux/sem.h>
  24 #include <linux/msg.h>
  25 #include <linux/icmpv6.h>
  26 #include <linux/syscalls.h>
  27 #include <linux/sysctl.h>
  28 #include <linux/utime.h>
  29 #include <linux/utsname.h>
  30 #include <linux/personality.h>
  31 #include <linux/dnotify.h>
  32 #include <linux/module.h>
  33 #include <linux/binfmts.h>
  34 #include <linux/security.h>
  35 #include <linux/syscalls.h>
  36 #include <linux/compat.h>
  37 #include <linux/vfs.h>
  38 #include <linux/ipc.h>
  39
  40 #include <net/sock.h>
  41 #include <net/scm.h>
  42
  43 #include <asm/compat-signal.h>
  44 #include <asm/sim.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/mmu_context.h>
  47 #include <asm/mman.h>
  48
  49 /* Use this to get at 32-bit user passed pointers. */
  50 /* A() macro should be used for places where you e.g.
  51    have some internal variable u32 and just want to get
  52    rid of a compiler warning. AA() has to be used in
  53    places where you want to convert a function argument
  54    to 32bit pointer or when you e.g. access pt_regs
  55    structure and want to consider 32bit registers only.
  56  */
  57 #define A(__x) ((unsigned long)(__x))
  58 #define AA(__x) ((unsigned long)((int)__x))
  59
  60 #ifdef __MIPSEB__
  61 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  62 #endif
  63 #ifdef __MIPSEL__
  64 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  65 #endif
  66
  67 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  68         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  69         unsigned long, pgoff)
  70 {
  71         struct file * file = NULL;
  72         unsigned long error;
  73
  74         error = -EINVAL;
  75         if (pgoff & (~PAGE_MASK >> 12))
  76                 goto out;
  77         pgoff >>= PAGE_SHIFT-12;
  78
  79         if (!(flags & MAP_ANONYMOUS)) {
  80                 error = -EBADF;
  81                 file = fget(fd);
  82                 if (!file)
  83                         goto out;
  84         }
  85         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  86
  87         down_write(&current->mm->mmap_sem);
  88         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  89         up_write(&current->mm->mmap_sem);
  90         if (file)
  91                 fput(file);
  92
  93 out:
  94         return error;
  95 }
  96
  97 /*
  98  * sys_execve() executes a new program.
  99  */
 100 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
 101 {
 102         int error;
 103         char * filename;
 104
 105         filename = getname(compat_ptr(regs.regs[4]));
 106         error = PTR_ERR(filename);
 107         if (IS_ERR(filename))
 108                 goto out;
 109         error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
 110                                  compat_ptr(regs.regs[6]), &regs);
 111         putname(filename);
 112
 113 out:
 114         return error;
 115 }
 116
 117 #define RLIM_INFINITY32 0x7fffffff
 118 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
 119
 120 struct rlimit32 {
 121         int     rlim_cur;
 122         int     rlim_max;
 123 };
 124
 125 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 126         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
 127 {
 128         return sys_truncate(path, merge_64(a2, a3));
 129 }
 130
 131 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 132         unsigned long, a2, unsigned long, a3)
 133 {
 134         return sys_ftruncate(fd, merge_64(a2, a3));
 135 }
 136
 137 SYSCALL_DEFINE5(32_llseek, unsigned long, fd, unsigned long, offset_high,
 138         unsigned long, offset_low, loff_t __user *, result,
 139         unsigned long, origin)
 140 {
 141         return sys_llseek(fd, offset_high, offset_low, result, origin);
 142 }
 143
 144 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 145    lseek back to original location.  They fail just like lseek does on
 146    non-seekable files.  */
 147
 148 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 149         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 150 {
 151         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 152 }
 153
 154 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 155         size_t, count, u32, unused, u64, a4, u64, a5)
 156 {
 157         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 158 }
 159
 160 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
 161         struct compat_timespec __user *, interval)
 162 {
 163         struct timespec t;
 164         int ret;
 165         mm_segment_t old_fs = get_fs();
 166
 167         set_fs(KERNEL_DS);
 168         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 169         set_fs(old_fs);
 170         if (put_user (t.tv_sec, &interval->tv_sec) ||
 171             __put_user(t.tv_nsec, &interval->tv_nsec))
 172                 return -EFAULT;
 173         return ret;
 174 }
 175
 176 #ifdef CONFIG_SYSVIPC
 177
 178 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
 179         unsigned long, ptr, unsigned long, fifth)
 180 {
 181         int version, err;
 182
 183         version = call >> 16; /* hack for backward compatibility */
 184         call &= 0xffff;
 185
 186         switch (call) {
 187         case SEMOP:
 188                 /* struct sembuf is the same on 32 and 64bit :)) */
 189                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 190                 break;
 191         case SEMTIMEDOP:
 192                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 193                                             compat_ptr(fifth));
 194                 break;
 195         case SEMGET:
 196                 err = sys_semget(first, second, third);
 197                 break;
 198         case SEMCTL:
 199                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 200                 break;
 201         case MSGSND:
 202                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 203                 break;
 204         case MSGRCV:
 205                 err = compat_sys_msgrcv(first, second, fifth, third,
 206                                         version, compat_ptr(ptr));
 207                 break;
 208         case MSGGET:
 209                 err = sys_msgget((key_t) first, second);
 210                 break;
 211         case MSGCTL:
 212                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 213                 break;
 214         case SHMAT:
 215                 err = compat_sys_shmat(first, second, third, version,
 216                                        compat_ptr(ptr));
 217                 break;
 218         case SHMDT:
 219                 err = sys_shmdt(compat_ptr(ptr));
 220                 break;
 221         case SHMGET:
 222                 err = sys_shmget(first, (unsigned)second, third);
 223                 break;
 224         case SHMCTL:
 225                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 226                 break;
 227         default:
 228                 err = -EINVAL;
 229                 break;
 230         }
 231
 232         return err;
 233 }
 234
 235 #else
 236
 237 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
 238         u32, ptr, u32, fifth)
 239 {
 240         return -ENOSYS;
 241 }
 242
 243 #endif /* CONFIG_SYSVIPC */
 244
 245 #ifdef CONFIG_MIPS32_N32
 246 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
 247 {
 248         /* compat_sys_semctl expects a pointer to union semun */
 249         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 250         if (put_user(arg, uptr))
 251                 return -EFAULT;
 252         return compat_sys_semctl(semid, semnum, cmd, uptr);
 253 }
 254
 255 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
 256         int, msgflg)
 257 {
 258         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 259 }
 260
 261 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
 262         int, msgtyp, int, msgflg)
 263 {
 264         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 265                                  compat_ptr(msgp));
 266 }
 267 #endif
 268
 269 struct sysctl_args32
 270 {
 271         compat_caddr_t name;
 272         int nlen;
 273         compat_caddr_t oldval;
 274         compat_caddr_t oldlenp;
 275         compat_caddr_t newval;
 276         compat_size_t newlen;
 277         unsigned int __unused[4];
 278 };
 279
 280 #ifdef CONFIG_SYSCTL_SYSCALL
 281
 282 SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
 283 {
 284         struct sysctl_args32 tmp;
 285         int error;
 286         size_t oldlen;
 287         size_t __user *oldlenp = NULL;
 288         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 289
 290         if (copy_from_user(&tmp, args, sizeof(tmp)))
 291                 return -EFAULT;
 292
 293         if (tmp.oldval && tmp.oldlenp) {
 294                 /* Duh, this is ugly and might not work if sysctl_args
 295                    is in read-only memory, but do_sysctl does indirectly
 296                    a lot of uaccess in both directions and we'd have to
 297                    basically copy the whole sysctl.c here, and
 298                    glibc's __sysctl uses rw memory for the structure
 299                    anyway.  */
 300                 if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
 301                     put_user(oldlen, (size_t __user *)addr))
 302                         return -EFAULT;
 303                 oldlenp = (size_t __user *)addr;
 304         }
 305
 306         lock_kernel();
 307         error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
 308                           oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
 309         unlock_kernel();
 310         if (oldlenp) {
 311                 if (!error) {
 312                         if (get_user(oldlen, (size_t __user *)addr) ||
 313                             put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
 314                                 error = -EFAULT;
 315                 }
 316                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 317         }
 318         return error;
 319 }
 320
 321 #else
 322
 323 SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
 324 {
 325         return -ENOSYS;
 326 }
 327
 328 #endif /* CONFIG_SYSCTL_SYSCALL */
 329
 330 SYSCALL_DEFINE1(32_newuname, struct new_utsname __user *, name)
 331 {
 332         int ret = 0;
 333
 334         down_read(&uts_sem);
 335         if (copy_to_user(name, utsname(), sizeof *name))
 336                 ret = -EFAULT;
 337         up_read(&uts_sem);
 338
 339         if (current->personality == PER_LINUX32 && !ret)
 340                 if (copy_to_user(name->machine, "mips\0\0\0", 8))
 341                         ret = -EFAULT;
 342
 343         return ret;
 344 }
 345
 346 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 347 {
 348         int ret;
 349         personality &= 0xffffffff;
 350         if (personality(current->personality) == PER_LINUX32 &&
 351             personality == PER_LINUX)
 352                 personality = PER_LINUX32;
 353         ret = sys_personality(personality);
 354         if (ret == PER_LINUX32)
 355                 ret = PER_LINUX;
 356         return ret;
 357 }
 358
 359 /* ustat compatibility */
 360 struct ustat32 {
 361         compat_daddr_t  f_tfree;
 362         compat_ino_t    f_tinode;
 363         char            f_fname[6];
 364         char            f_fpack[6];
 365 };
 366
 367 extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);
 368
 369 SYSCALL_DEFINE2(32_ustat, dev_t, dev, struct ustat32 __user *, ubuf32)
 370 {
 371         int err;
 372         struct ustat tmp;
 373         struct ustat32 tmp32;
 374         mm_segment_t old_fs = get_fs();
 375
 376         set_fs(KERNEL_DS);
 377         err = sys_ustat(dev, (struct ustat __user *)&tmp);
 378         set_fs(old_fs);
 379
 380         if (err)
 381                 goto out;
 382
 383         memset(&tmp32, 0, sizeof(struct ustat32));
 384         tmp32.f_tfree = tmp.f_tfree;
 385         tmp32.f_tinode = tmp.f_tinode;
 386
 387         err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;
 388
 389 out:
 390         return err;
 391 }
 392
 393 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
 394         compat_off_t __user *, offset, s32, count)
 395 {
 396         mm_segment_t old_fs = get_fs();
 397         int ret;
 398         off_t of;
 399
 400         if (offset && get_user(of, offset))
 401                 return -EFAULT;
 402
 403         set_fs(KERNEL_DS);
 404         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 405         set_fs(old_fs);
 406
 407         if (offset && put_user(of, offset))
 408                 return -EFAULT;
 409
 410         return ret;
 411 }
 412
 413 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 414                                    size_t count)
 415 {
 416         return sys_readahead(fd, merge_64(a2, a3), count);
 417 }
 418
 419 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 420         unsigned long a2, unsigned long a3,
 421         unsigned long a4, unsigned long a5,
 422         int flags)
 423 {
 424         return sys_sync_file_range(fd,
 425                         merge_64(a2, a3), merge_64(a4, a5),
 426                         flags);
 427 }
 428
 429 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 430         unsigned long a2, unsigned long a3,
 431         unsigned long a4, unsigned long a5,
 432         int flags)
 433 {
 434         return sys_fadvise64_64(fd,
 435                         merge_64(a2, a3), merge_64(a4, a5),
 436                         flags);
 437 }
 438
 439 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 440         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 441 {
 442         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 443                              merge_64(len_a4, len_a5));
 444 }
 445
 446 save_static_function(sys32_clone);
 447 static int noinline __used
 448 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 449 {
 450         unsigned long clone_flags;
 451         unsigned long newsp;
 452         int __user *parent_tidptr, *child_tidptr;
 453
 454         clone_flags = regs.regs[4];
 455         newsp = regs.regs[5];
 456         if (!newsp)
 457                 newsp = regs.regs[29];
 458         parent_tidptr = (int __user *) regs.regs[6];
 459
 460         /* Use __dummy4 instead of getting it off the stack, so that
 461            syscall() works.  */
 462         child_tidptr = (int __user *) __dummy4;
 463         return do_fork(clone_flags, newsp, &regs, 0,
 464                        parent_tidptr, child_tidptr);
 465 }