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 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  67         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  68         unsigned long, pgoff)
  69 {
  70         unsigned long error;
  71
  72         error = -EINVAL;
  73         if (pgoff & (~PAGE_MASK >> 12))
  74                 goto out;
  75         error = sys_mmap_pgoff(addr, len, prot, flags, fd,
  76                                pgoff >> (PAGE_SHIFT-12));
  77 out:
  78         return error;
  79 }
  80
  81 /*
  82  * sys_execve() executes a new program.
  83  */
  84 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
  85 {
  86         int error;
  87         char * filename;
  88
  89         filename = getname(compat_ptr(regs.regs[4]));
  90         error = PTR_ERR(filename);
  91         if (IS_ERR(filename))
  92                 goto out;
  93         error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
  94                                  compat_ptr(regs.regs[6]), &regs);
  95         putname(filename);
  96
  97 out:
  98         return error;
  99 }
 100
 101 #define RLIM_INFINITY32 0x7fffffff
 102 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
 103
 104 struct rlimit32 {
 105         int     rlim_cur;
 106         int     rlim_max;
 107 };
 108
 109 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 110         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
 111 {
 112         return sys_truncate(path, merge_64(a2, a3));
 113 }
 114
 115 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 116         unsigned long, a2, unsigned long, a3)
 117 {
 118         return sys_ftruncate(fd, merge_64(a2, a3));
 119 }
 120
 121 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
 122                 unsigned int, offset_low, loff_t __user *, result,
 123                 unsigned int, origin)
 124 {
 125         return sys_llseek(fd, offset_high, offset_low, result, origin);
 126 }
 127
 128 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 129    lseek back to original location.  They fail just like lseek does on
 130    non-seekable files.  */
 131
 132 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 133         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 134 {
 135         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 136 }
 137
 138 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 139         size_t, count, u32, unused, u64, a4, u64, a5)
 140 {
 141         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 142 }
 143
 144 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
 145         struct compat_timespec __user *, interval)
 146 {
 147         struct timespec t;
 148         int ret;
 149         mm_segment_t old_fs = get_fs();
 150
 151         set_fs(KERNEL_DS);
 152         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 153         set_fs(old_fs);
 154         if (put_user (t.tv_sec, &interval->tv_sec) ||
 155             __put_user(t.tv_nsec, &interval->tv_nsec))
 156                 return -EFAULT;
 157         return ret;
 158 }
 159
 160 #ifdef CONFIG_SYSVIPC
 161
 162 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
 163         unsigned long, ptr, unsigned long, fifth)
 164 {
 165         int version, err;
 166
 167         version = call >> 16; /* hack for backward compatibility */
 168         call &= 0xffff;
 169
 170         switch (call) {
 171         case SEMOP:
 172                 /* struct sembuf is the same on 32 and 64bit :)) */
 173                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 174                 break;
 175         case SEMTIMEDOP:
 176                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 177                                             compat_ptr(fifth));
 178                 break;
 179         case SEMGET:
 180                 err = sys_semget(first, second, third);
 181                 break;
 182         case SEMCTL:
 183                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 184                 break;
 185         case MSGSND:
 186                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 187                 break;
 188         case MSGRCV:
 189                 err = compat_sys_msgrcv(first, second, fifth, third,
 190                                         version, compat_ptr(ptr));
 191                 break;
 192         case MSGGET:
 193                 err = sys_msgget((key_t) first, second);
 194                 break;
 195         case MSGCTL:
 196                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 197                 break;
 198         case SHMAT:
 199                 err = compat_sys_shmat(first, second, third, version,
 200                                        compat_ptr(ptr));
 201                 break;
 202         case SHMDT:
 203                 err = sys_shmdt(compat_ptr(ptr));
 204                 break;
 205         case SHMGET:
 206                 err = sys_shmget(first, (unsigned)second, third);
 207                 break;
 208         case SHMCTL:
 209                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 210                 break;
 211         default:
 212                 err = -EINVAL;
 213                 break;
 214         }
 215
 216         return err;
 217 }
 218
 219 #else
 220
 221 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
 222         u32, ptr, u32, fifth)
 223 {
 224         return -ENOSYS;
 225 }
 226
 227 #endif /* CONFIG_SYSVIPC */
 228
 229 #ifdef CONFIG_MIPS32_N32
 230 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
 231 {
 232         /* compat_sys_semctl expects a pointer to union semun */
 233         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 234         if (put_user(arg, uptr))
 235                 return -EFAULT;
 236         return compat_sys_semctl(semid, semnum, cmd, uptr);
 237 }
 238
 239 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
 240         int, msgflg)
 241 {
 242         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 243 }
 244
 245 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
 246         int, msgtyp, int, msgflg)
 247 {
 248         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 249                                  compat_ptr(msgp));
 250 }
 251 #endif
 252
 253 struct sysctl_args32
 254 {
 255         compat_caddr_t name;
 256         int nlen;
 257         compat_caddr_t oldval;
 258         compat_caddr_t oldlenp;
 259         compat_caddr_t newval;
 260         compat_size_t newlen;
 261         unsigned int __unused[4];
 262 };
 263
 264 #ifdef CONFIG_SYSCTL_SYSCALL
 265
 266 SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
 267 {
 268         struct sysctl_args32 tmp;
 269         int error;
 270         size_t oldlen;
 271         size_t __user *oldlenp = NULL;
 272         unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 273
 274         if (copy_from_user(&tmp, args, sizeof(tmp)))
 275                 return -EFAULT;
 276
 277         if (tmp.oldval && tmp.oldlenp) {
 278                 /* Duh, this is ugly and might not work if sysctl_args
 279                    is in read-only memory, but do_sysctl does indirectly
 280                    a lot of uaccess in both directions and we'd have to
 281                    basically copy the whole sysctl.c here, and
 282                    glibc's __sysctl uses rw memory for the structure
 283                    anyway.  */
 284                 if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
 285                     put_user(oldlen, (size_t __user *)addr))
 286                         return -EFAULT;
 287                 oldlenp = (size_t __user *)addr;
 288         }
 289
 290         lock_kernel();
 291         error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
 292                           oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
 293         unlock_kernel();
 294         if (oldlenp) {
 295                 if (!error) {
 296                         if (get_user(oldlen, (size_t __user *)addr) ||
 297                             put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
 298                                 error = -EFAULT;
 299                 }
 300                 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
 301         }
 302         return error;
 303 }
 304
 305 #else
 306
 307 SYSCALL_DEFINE1(32_sysctl, struct sysctl_args32 __user *, args)
 308 {
 309         return -ENOSYS;
 310 }
 311
 312 #endif /* CONFIG_SYSCTL_SYSCALL */
 313
 314 SYSCALL_DEFINE1(32_newuname, struct new_utsname __user *, name)
 315 {
 316         int ret = 0;
 317
 318         down_read(&uts_sem);
 319         if (copy_to_user(name, utsname(), sizeof *name))
 320                 ret = -EFAULT;
 321         up_read(&uts_sem);
 322
 323         if (current->personality == PER_LINUX32 && !ret)
 324                 if (copy_to_user(name->machine, "mips\0\0\0", 8))
 325                         ret = -EFAULT;
 326
 327         return ret;
 328 }
 329
 330 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 331 {
 332         int ret;
 333         personality &= 0xffffffff;
 334         if (personality(current->personality) == PER_LINUX32 &&
 335             personality == PER_LINUX)
 336                 personality = PER_LINUX32;
 337         ret = sys_personality(personality);
 338         if (ret == PER_LINUX32)
 339                 ret = PER_LINUX;
 340         return ret;
 341 }
 342
 343 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
 344         compat_off_t __user *, offset, s32, count)
 345 {
 346         mm_segment_t old_fs = get_fs();
 347         int ret;
 348         off_t of;
 349
 350         if (offset && get_user(of, offset))
 351                 return -EFAULT;
 352
 353         set_fs(KERNEL_DS);
 354         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 355         set_fs(old_fs);
 356
 357         if (offset && put_user(of, offset))
 358                 return -EFAULT;
 359
 360         return ret;
 361 }
 362
 363 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 364                                    size_t count)
 365 {
 366         return sys_readahead(fd, merge_64(a2, a3), count);
 367 }
 368
 369 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 370         unsigned long a2, unsigned long a3,
 371         unsigned long a4, unsigned long a5,
 372         int flags)
 373 {
 374         return sys_sync_file_range(fd,
 375                         merge_64(a2, a3), merge_64(a4, a5),
 376                         flags);
 377 }
 378
 379 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 380         unsigned long a2, unsigned long a3,
 381         unsigned long a4, unsigned long a5,
 382         int flags)
 383 {
 384         return sys_fadvise64_64(fd,
 385                         merge_64(a2, a3), merge_64(a4, a5),
 386                         flags);
 387 }
 388
 389 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 390         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 391 {
 392         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 393                              merge_64(len_a4, len_a5));
 394 }
 395
 396 save_static_function(sys32_clone);
 397 static int noinline __used
 398 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 399 {
 400         unsigned long clone_flags;
 401         unsigned long newsp;
 402         int __user *parent_tidptr, *child_tidptr;
 403
 404         clone_flags = regs.regs[4];
 405         newsp = regs.regs[5];
 406         if (!newsp)
 407                 newsp = regs.regs[29];
 408         parent_tidptr = (int __user *) regs.regs[6];
 409
 410         /* Use __dummy4 instead of getting it off the stack, so that
 411            syscall() works.  */
 412         child_tidptr = (int __user *) __dummy4;
 413         return do_fork(clone_flags, newsp, &regs, 0,
 414                        parent_tidptr, child_tidptr);
 415 }
 416
 417 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
 418         size_t len)
 419 {
 420         return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
 421 }