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  */
   7 #include <linux/compiler.h>
   8 #include <linux/mm.h>
   9 #include <linux/errno.h>
  10 #include <linux/file.h>
  11 #include <linux/highuid.h>
  12 #include <linux/resource.h>
  13 #include <linux/highmem.h>
  14 #include <linux/time.h>
  15 #include <linux/times.h>
  16 #include <linux/poll.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/filter.h>
  19 #include <linux/shm.h>
  20 #include <linux/sem.h>
  21 #include <linux/msg.h>
  22 #include <linux/icmpv6.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/sysctl.h>
  25 #include <linux/utime.h>
  26 #include <linux/utsname.h>
  27 #include <linux/personality.h>
  28 #include <linux/dnotify.h>
  29 #include <linux/module.h>
  30 #include <linux/binfmts.h>
  31 #include <linux/security.h>
  32 #include <linux/compat.h>
  33 #include <linux/vfs.h>
  34 #include <linux/ipc.h>
  35 #include <linux/slab.h>
  36
  37 #include <net/sock.h>
  38 #include <net/scm.h>
  39
  40 #include <asm/compat-signal.h>
  41 #include <asm/sim.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/mman.h>
  45
  46 /* Use this to get at 32-bit user passed pointers. */
  47 /* A() macro should be used for places where you e.g.
  48    have some internal variable u32 and just want to get
  49    rid of a compiler warning. AA() has to be used in
  50    places where you want to convert a function argument
  51    to 32bit pointer or when you e.g. access pt_regs
  52    structure and want to consider 32bit registers only.
  53  */
  54 #define A(__x) ((unsigned long)(__x))
  55 #define AA(__x) ((unsigned long)((int)__x))
  56
  57 #ifdef __MIPSEB__
  58 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  59 #endif
  60 #ifdef __MIPSEL__
  61 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  62 #endif
  63
  64 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  65         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  66         unsigned long, pgoff)
  67 {
  68         unsigned long error;
  69
  70         error = -EINVAL;
  71         if (pgoff & (~PAGE_MASK >> 12))
  72                 goto out;
  73         error = sys_mmap_pgoff(addr, len, prot, flags, fd,
  74                                pgoff >> (PAGE_SHIFT-12));
  75 out:
  76         return error;
  77 }
  78
  79 #define RLIM_INFINITY32 0x7fffffff
  80 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
  81
  82 struct rlimit32 {
  83         int     rlim_cur;
  84         int     rlim_max;
  85 };
  86
  87 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  88         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  89 {
  90         return sys_truncate(path, merge_64(a2, a3));
  91 }
  92
  93 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  94         unsigned long, a2, unsigned long, a3)
  95 {
  96         return sys_ftruncate(fd, merge_64(a2, a3));
  97 }
  98
  99 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
 100                 unsigned int, offset_low, loff_t __user *, result,
 101                 unsigned int, origin)
 102 {
 103         return sys_llseek(fd, offset_high, offset_low, result, origin);
 104 }
 105
 106 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 107    lseek back to original location.  They fail just like lseek does on
 108    non-seekable files.  */
 109
 110 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 111         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 112 {
 113         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 114 }
 115
 116 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 117         size_t, count, u32, unused, u64, a4, u64, a5)
 118 {
 119         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 120 }
 121
 122 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
 123         struct compat_timespec __user *, interval)
 124 {
 125         struct timespec t;
 126         int ret;
 127         mm_segment_t old_fs = get_fs();
 128
 129         set_fs(KERNEL_DS);
 130         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 131         set_fs(old_fs);
 132         if (put_user (t.tv_sec, &interval->tv_sec) ||
 133             __put_user(t.tv_nsec, &interval->tv_nsec))
 134                 return -EFAULT;
 135         return ret;
 136 }
 137
 138 #ifdef CONFIG_SYSVIPC
 139
 140 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
 141         unsigned long, ptr, unsigned long, fifth)
 142 {
 143         int version, err;
 144
 145         version = call >> 16; /* hack for backward compatibility */
 146         call &= 0xffff;
 147
 148         switch (call) {
 149         case SEMOP:
 150                 /* struct sembuf is the same on 32 and 64bit :)) */
 151                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 152                 break;
 153         case SEMTIMEDOP:
 154                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 155                                             compat_ptr(fifth));
 156                 break;
 157         case SEMGET:
 158                 err = sys_semget(first, second, third);
 159                 break;
 160         case SEMCTL:
 161                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 162                 break;
 163         case MSGSND:
 164                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 165                 break;
 166         case MSGRCV:
 167                 err = compat_sys_msgrcv(first, second, fifth, third,
 168                                         version, compat_ptr(ptr));
 169                 break;
 170         case MSGGET:
 171                 err = sys_msgget((key_t) first, second);
 172                 break;
 173         case MSGCTL:
 174                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 175                 break;
 176         case SHMAT:
 177                 err = compat_sys_shmat(first, second, third, version,
 178                                        compat_ptr(ptr));
 179                 break;
 180         case SHMDT:
 181                 err = sys_shmdt(compat_ptr(ptr));
 182                 break;
 183         case SHMGET:
 184                 err = sys_shmget(first, (unsigned)second, third);
 185                 break;
 186         case SHMCTL:
 187                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 188                 break;
 189         default:
 190                 err = -EINVAL;
 191                 break;
 192         }
 193
 194         return err;
 195 }
 196
 197 #else
 198
 199 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
 200         u32, ptr, u32, fifth)
 201 {
 202         return -ENOSYS;
 203 }
 204
 205 #endif /* CONFIG_SYSVIPC */
 206
 207 #ifdef CONFIG_MIPS32_N32
 208 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
 209 {
 210         /* compat_sys_semctl expects a pointer to union semun */
 211         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 212         if (put_user(arg, uptr))
 213                 return -EFAULT;
 214         return compat_sys_semctl(semid, semnum, cmd, uptr);
 215 }
 216
 217 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
 218         int, msgflg)
 219 {
 220         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 221 }
 222
 223 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
 224         int, msgtyp, int, msgflg)
 225 {
 226         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 227                                  compat_ptr(msgp));
 228 }
 229 #endif
 230
 231 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 232 {
 233         unsigned int p = personality & 0xffffffff;
 234         int ret;
 235
 236         if (personality(current->personality) == PER_LINUX32 &&
 237             personality(p) == PER_LINUX)
 238                 p = (p & ~PER_MASK) | PER_LINUX32;
 239         ret = sys_personality(p);
 240         if (ret != -1 && personality(ret) == PER_LINUX32)
 241                 ret = (ret & ~PER_MASK) | PER_LINUX;
 242         return ret;
 243 }
 244
 245 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
 246         compat_off_t __user *, offset, s32, count)
 247 {
 248         mm_segment_t old_fs = get_fs();
 249         int ret;
 250         off_t of;
 251
 252         if (offset && get_user(of, offset))
 253                 return -EFAULT;
 254
 255         set_fs(KERNEL_DS);
 256         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 257         set_fs(old_fs);
 258
 259         if (offset && put_user(of, offset))
 260                 return -EFAULT;
 261
 262         return ret;
 263 }
 264
 265 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 266                                    size_t count)
 267 {
 268         return sys_readahead(fd, merge_64(a2, a3), count);
 269 }
 270
 271 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 272         unsigned long a2, unsigned long a3,
 273         unsigned long a4, unsigned long a5,
 274         int flags)
 275 {
 276         return sys_sync_file_range(fd,
 277                         merge_64(a2, a3), merge_64(a4, a5),
 278                         flags);
 279 }
 280
 281 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 282         unsigned long a2, unsigned long a3,
 283         unsigned long a4, unsigned long a5,
 284         int flags)
 285 {
 286         return sys_fadvise64_64(fd,
 287                         merge_64(a2, a3), merge_64(a4, a5),
 288                         flags);
 289 }
 290
 291 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 292         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 293 {
 294         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 295                              merge_64(len_a4, len_a5));
 296 }
 297
 298 save_static_function(sys32_clone);
 299 static int noinline __used
 300 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 301 {
 302         unsigned long clone_flags;
 303         unsigned long newsp;
 304         int __user *parent_tidptr, *child_tidptr;
 305
 306         clone_flags = regs.regs[4];
 307         newsp = regs.regs[5];
 308         if (!newsp)
 309                 newsp = regs.regs[29];
 310         parent_tidptr = (int __user *) regs.regs[6];
 311
 312         /* Use __dummy4 instead of getting it off the stack, so that
 313            syscall() works.  */
 314         child_tidptr = (int __user *) __dummy4;
 315         return do_fork(clone_flags, newsp, &regs, 0,
 316                        parent_tidptr, child_tidptr);
 317 }
 318
 319 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
 320         size_t len)
 321 {
 322         return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
 323 }
 324
 325 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
 326                 u64, a3, u64, a4, int, dfd, const char  __user *, pathname)
 327 {
 328         return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
 329                                  dfd, pathname);
 330 }
 331
 332 SYSCALL_DEFINE6(32_futex, u32 __user *, uaddr, int, op, u32, val,
 333                 struct compat_timespec __user *, utime, u32 __user *, uaddr2,
 334                 u32, val3)
 335 {
 336         return compat_sys_futex(uaddr, op, val, utime, uaddr2, val3);
 337 }