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/compat.h>
  36 #include <linux/vfs.h>
  37 #include <linux/ipc.h>
  38
  39 #include <net/sock.h>
  40 #include <net/scm.h>
  41
  42 #include <asm/compat-signal.h>
  43 #include <asm/sim.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/mman.h>
  47
  48 /* Use this to get at 32-bit user passed pointers. */
  49 /* A() macro should be used for places where you e.g.
  50    have some internal variable u32 and just want to get
  51    rid of a compiler warning. AA() has to be used in
  52    places where you want to convert a function argument
  53    to 32bit pointer or when you e.g. access pt_regs
  54    structure and want to consider 32bit registers only.
  55  */
  56 #define A(__x) ((unsigned long)(__x))
  57 #define AA(__x) ((unsigned long)((int)__x))
  58
  59 #ifdef __MIPSEB__
  60 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  61 #endif
  62 #ifdef __MIPSEL__
  63 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  64 #endif
  65
  66 asmlinkage unsigned long
  67 sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  68          unsigned long flags, unsigned long fd, unsigned long pgoff)
  69 {
  70         struct file * file = NULL;
  71         unsigned long error;
  72
  73         error = -EINVAL;
  74         if (pgoff & (~PAGE_MASK >> 12))
  75                 goto out;
  76         pgoff >>= PAGE_SHIFT-12;
  77
  78         if (!(flags & MAP_ANONYMOUS)) {
  79                 error = -EBADF;
  80                 file = fget(fd);
  81                 if (!file)
  82                         goto out;
  83         }
  84         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  85
  86         down_write(&current->mm->mmap_sem);
  87         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  88         up_write(&current->mm->mmap_sem);
  89         if (file)
  90                 fput(file);
  91
  92 out:
  93         return error;
  94 }
  95
  96 /*
  97  * sys_execve() executes a new program.
  98  */
  99 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
 100 {
 101         int error;
 102         char * filename;
 103
 104         filename = getname(compat_ptr(regs.regs[4]));
 105         error = PTR_ERR(filename);
 106         if (IS_ERR(filename))
 107                 goto out;
 108         error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
 109                                  compat_ptr(regs.regs[6]), &regs);
 110         putname(filename);
 111
 112 out:
 113         return error;
 114 }
 115
 116 #define RLIM_INFINITY32 0x7fffffff
 117 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
 118
 119 struct rlimit32 {
 120         int     rlim_cur;
 121         int     rlim_max;
 122 };
 123
 124 asmlinkage long sys32_truncate64(const char __user * path,
 125         unsigned long __dummy, int a2, int a3)
 126 {
 127         return sys_truncate(path, merge_64(a2, a3));
 128 }
 129
 130 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
 131         int a2, int a3)
 132 {
 133         return sys_ftruncate(fd, merge_64(a2, a3));
 134 }
 135
 136 asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
 137                             unsigned int offset_low, loff_t __user * result,
 138                             unsigned int origin)
 139 {
 140         return sys_llseek(fd, offset_high, offset_low, result, origin);
 141 }
 142
 143 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 144    lseek back to original location.  They fail just like lseek does on
 145    non-seekable files.  */
 146
 147 asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
 148                                size_t count, u32 unused, u64 a4, u64 a5)
 149 {
 150         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 151 }
 152
 153 asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
 154                                 size_t count, u32 unused, u64 a4, u64 a5)
 155 {
 156         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 157 }
 158
 159 asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid,
 160         struct compat_timespec __user *interval)
 161 {
 162         struct timespec t;
 163         int ret;
 164         mm_segment_t old_fs = get_fs();
 165
 166         set_fs(KERNEL_DS);
 167         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 168         set_fs(old_fs);
 169         if (put_user (t.tv_sec, &interval->tv_sec) ||
 170             __put_user(t.tv_nsec, &interval->tv_nsec))
 171                 return -EFAULT;
 172         return ret;
 173 }
 174
 175 #ifdef CONFIG_SYSVIPC
 176
 177 asmlinkage long
 178 sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
 179 {
 180         int version, err;
 181
 182         version = call >> 16; /* hack for backward compatibility */
 183         call &= 0xffff;
 184
 185         switch (call) {
 186         case SEMOP:
 187                 /* struct sembuf is the same on 32 and 64bit :)) */
 188                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 189                 break;
 190         case SEMTIMEDOP:
 191                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 192                                             compat_ptr(fifth));
 193                 break;
 194         case SEMGET:
 195                 err = sys_semget(first, second, third);
 196                 break;
 197         case SEMCTL:
 198                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 199                 break;
 200         case MSGSND:
 201                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 202                 break;
 203         case MSGRCV:
 204                 err = compat_sys_msgrcv(first, second, fifth, third,
 205                                         version, compat_ptr(ptr));
 206                 break;
 207         case MSGGET:
 208                 err = sys_msgget((key_t) first, second);
 209                 break;
 210         case MSGCTL:
 211                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 212                 break;
 213         case SHMAT:
 214                 err = compat_sys_shmat(first, second, third, version,
 215                                        compat_ptr(ptr));
 216                 break;
 217         case SHMDT:
 218                 err = sys_shmdt(compat_ptr(ptr));
 219                 break;
 220         case SHMGET:
 221                 err = sys_shmget(first, (unsigned)second, third);
 222                 break;
 223         case SHMCTL:
 224                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 225                 break;
 226         default:
 227                 err = -EINVAL;
 228                 break;
 229         }
 230
 231         return err;
 232 }
 233
 234 #else
 235
 236 asmlinkage long
 237 sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
 238 {
 239         return -ENOSYS;
 240 }
 241
 242 #endif /* CONFIG_SYSVIPC */
 243
 244 #ifdef CONFIG_MIPS32_N32
 245 asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
 246 {
 247         /* compat_sys_semctl expects a pointer to union semun */
 248         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 249         if (put_user(arg, uptr))
 250                 return -EFAULT;
 251         return compat_sys_semctl(semid, semnum, cmd, uptr);
 252 }
 253
 254 asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
 255 {
 256         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 257 }
 258
 259 asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
 260                               int msgflg)
 261 {
 262         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 263                                  compat_ptr(msgp));
 264 }
 265 #endif
 266
 267 struct sysctl_args32
 268 {
 269         compat_caddr_t name;
 270         int nlen;
 271         compat_caddr_t oldval;
 272         compat_caddr_t oldlenp;
 273         compat_caddr_t newval;
 274         compat_size_t newlen;
 275         unsigned int __unused[4];
 276 };
 277
 278 #ifdef CONFIG_SYSCTL_SYSCALL
 279
 280 asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
 281 {
 282         struct sysctl_args32 tmp;
 283         int error;
 284         size_t oldlen;
 285         size_t __user *oldlenp = NULL;
 286         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 287
 288         if (copy_from_user(&tmp, args, sizeof(tmp)))
 289                 return -EFAULT;
 290
 291         if (tmp.oldval && tmp.oldlenp) {
 292                 /* Duh, this is ugly and might not work if sysctl_args
 293                    is in read-only memory, but do_sysctl does indirectly
 294                    a lot of uaccess in both directions and we'd have to
 295                    basically copy the whole sysctl.c here, and
 296                    glibc's __sysctl uses rw memory for the structure
 297                    anyway.  */
 298                 if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
 299                     put_user(oldlen, (size_t __user *)addr))
 300                         return -EFAULT;
 301                 oldlenp = (size_t __user *)addr;
 302         }
 303
 304         lock_kernel();
 305         error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
 306                           oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
 307         unlock_kernel();
 308         if (oldlenp) {
 309                 if (!error) {
 310                         if (get_user(oldlen, (size_t __user *)addr) ||
 311                             put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
 312                                 error = -EFAULT;
 313                 }
 314                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 315         }
 316         return error;
 317 }
 318
 319 #endif /* CONFIG_SYSCTL_SYSCALL */
 320
 321 asmlinkage long sys32_newuname(struct new_utsname __user * name)
 322 {
 323         int ret = 0;
 324
 325         down_read(&uts_sem);
 326         if (copy_to_user(name, utsname(), sizeof *name))
 327                 ret = -EFAULT;
 328         up_read(&uts_sem);
 329
 330         if (current->personality == PER_LINUX32 && !ret)
 331                 if (copy_to_user(name->machine, "mips\0\0\0", 8))
 332                         ret = -EFAULT;
 333
 334         return ret;
 335 }
 336
 337 asmlinkage int sys32_personality(unsigned long personality)
 338 {
 339         int ret;
 340         personality &= 0xffffffff;
 341         if (personality(current->personality) == PER_LINUX32 &&
 342             personality == PER_LINUX)
 343                 personality = PER_LINUX32;
 344         ret = sys_personality(personality);
 345         if (ret == PER_LINUX32)
 346                 ret = PER_LINUX;
 347         return ret;
 348 }
 349
 350 /* ustat compatibility */
 351 struct ustat32 {
 352         compat_daddr_t  f_tfree;
 353         compat_ino_t    f_tinode;
 354         char            f_fname[6];
 355         char            f_fpack[6];
 356 };
 357
 358 extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);
 359
 360 asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
 361 {
 362         int err;
 363         struct ustat tmp;
 364         struct ustat32 tmp32;
 365         mm_segment_t old_fs = get_fs();
 366
 367         set_fs(KERNEL_DS);
 368         err = sys_ustat(dev, (struct ustat __user *)&tmp);
 369         set_fs(old_fs);
 370
 371         if (err)
 372                 goto out;
 373
 374         memset(&tmp32, 0, sizeof(struct ustat32));
 375         tmp32.f_tfree = tmp.f_tfree;
 376         tmp32.f_tinode = tmp.f_tinode;
 377
 378         err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;
 379
 380 out:
 381         return err;
 382 }
 383
 384 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
 385         s32 count)
 386 {
 387         mm_segment_t old_fs = get_fs();
 388         int ret;
 389         off_t of;
 390
 391         if (offset && get_user(of, offset))
 392                 return -EFAULT;
 393
 394         set_fs(KERNEL_DS);
 395         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 396         set_fs(old_fs);
 397
 398         if (offset && put_user(of, offset))
 399                 return -EFAULT;
 400
 401         return ret;
 402 }
 403
 404 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 405                                    size_t count)
 406 {
 407         return sys_readahead(fd, merge_64(a2, a3), count);
 408 }
 409
 410 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 411         unsigned long a2, unsigned long a3,
 412         unsigned long a4, unsigned long a5,
 413         int flags)
 414 {
 415         return sys_sync_file_range(fd,
 416                         merge_64(a2, a3), merge_64(a4, a5),
 417                         flags);
 418 }
 419
 420 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 421         unsigned long a2, unsigned long a3,
 422         unsigned long a4, unsigned long a5,
 423         int flags)
 424 {
 425         return sys_fadvise64_64(fd,
 426                         merge_64(a2, a3), merge_64(a4, a5),
 427                         flags);
 428 }
 429
 430 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 431         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 432 {
 433         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 434                              merge_64(len_a4, len_a5));
 435 }
 436
 437 save_static_function(sys32_clone);
 438 static int noinline __used
 439 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 440 {
 441         unsigned long clone_flags;
 442         unsigned long newsp;
 443         int __user *parent_tidptr, *child_tidptr;
 444
 445         clone_flags = regs.regs[4];
 446         newsp = regs.regs[5];
 447         if (!newsp)
 448                 newsp = regs.regs[29];
 449         parent_tidptr = (int __user *) regs.regs[6];
 450
 451         /* Use __dummy4 instead of getting it off the stack, so that
 452            syscall() works.  */
 453         child_tidptr = (int __user *) __dummy4;
 454         return do_fork(clone_flags, newsp, &regs, 0,
 455                        parent_tidptr, child_tidptr);
 456 }