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/highuid.h>
  13 #include <linux/resource.h>
  14 #include <linux/highmem.h>
  15 #include <linux/time.h>
  16 #include <linux/times.h>
  17 #include <linux/poll.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/filter.h>
  20 #include <linux/shm.h>
  21 #include <linux/sem.h>
  22 #include <linux/msg.h>
  23 #include <linux/icmpv6.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/utime.h>
  27 #include <linux/utsname.h>
  28 #include <linux/personality.h>
  29 #include <linux/dnotify.h>
  30 #include <linux/module.h>
  31 #include <linux/binfmts.h>
  32 #include <linux/security.h>
  33 #include <linux/compat.h>
  34 #include <linux/vfs.h>
  35 #include <linux/ipc.h>
  36 #include <linux/slab.h>
  37
  38 #include <net/sock.h>
  39 #include <net/scm.h>
  40
  41 #include <asm/compat-signal.h>
  42 #include <asm/sim.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/mmu_context.h>
  45 #include <asm/mman.h>
  46
  47 /* Use this to get at 32-bit user passed pointers. */
  48 /* A() macro should be used for places where you e.g.
  49    have some internal variable u32 and just want to get
  50    rid of a compiler warning. AA() has to be used in
  51    places where you want to convert a function argument
  52    to 32bit pointer or when you e.g. access pt_regs
  53    structure and want to consider 32bit registers only.
  54  */
  55 #define A(__x) ((unsigned long)(__x))
  56 #define AA(__x) ((unsigned long)((int)__x))
  57
  58 #ifdef __MIPSEB__
  59 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  60 #endif
  61 #ifdef __MIPSEL__
  62 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  63 #endif
  64
  65 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  66         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  67         unsigned long, pgoff)
  68 {
  69         unsigned long error;
  70
  71         error = -EINVAL;
  72         if (pgoff & (~PAGE_MASK >> 12))
  73                 goto out;
  74         error = sys_mmap_pgoff(addr, len, prot, flags, fd,
  75                                pgoff >> (PAGE_SHIFT-12));
  76 out:
  77         return error;
  78 }
  79
  80 /*
  81  * sys_execve() executes a new program.
  82  */
  83 asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
  84 {
  85         int error;
  86         char * filename;
  87
  88         filename = getname(compat_ptr(regs.regs[4]));
  89         error = PTR_ERR(filename);
  90         if (IS_ERR(filename))
  91                 goto out;
  92         error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
  93                                  compat_ptr(regs.regs[6]), &regs);
  94         putname(filename);
  95
  96 out:
  97         return error;
  98 }
  99
 100 #define RLIM_INFINITY32 0x7fffffff
 101 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
 102
 103 struct rlimit32 {
 104         int     rlim_cur;
 105         int     rlim_max;
 106 };
 107
 108 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 109         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
 110 {
 111         return sys_truncate(path, merge_64(a2, a3));
 112 }
 113
 114 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 115         unsigned long, a2, unsigned long, a3)
 116 {
 117         return sys_ftruncate(fd, merge_64(a2, a3));
 118 }
 119
 120 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
 121                 unsigned int, offset_low, loff_t __user *, result,
 122                 unsigned int, origin)
 123 {
 124         return sys_llseek(fd, offset_high, offset_low, result, origin);
 125 }
 126
 127 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 128    lseek back to original location.  They fail just like lseek does on
 129    non-seekable files.  */
 130
 131 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 132         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 133 {
 134         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 135 }
 136
 137 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 138         size_t, count, u32, unused, u64, a4, u64, a5)
 139 {
 140         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 141 }
 142
 143 SYSCALL_DEFINE2(32_sched_rr_get_interval, compat_pid_t, pid,
 144         struct compat_timespec __user *, interval)
 145 {
 146         struct timespec t;
 147         int ret;
 148         mm_segment_t old_fs = get_fs();
 149
 150         set_fs(KERNEL_DS);
 151         ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
 152         set_fs(old_fs);
 153         if (put_user (t.tv_sec, &interval->tv_sec) ||
 154             __put_user(t.tv_nsec, &interval->tv_nsec))
 155                 return -EFAULT;
 156         return ret;
 157 }
 158
 159 #ifdef CONFIG_SYSVIPC
 160
 161 SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
 162         unsigned long, ptr, unsigned long, fifth)
 163 {
 164         int version, err;
 165
 166         version = call >> 16; /* hack for backward compatibility */
 167         call &= 0xffff;
 168
 169         switch (call) {
 170         case SEMOP:
 171                 /* struct sembuf is the same on 32 and 64bit :)) */
 172                 err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
 173                 break;
 174         case SEMTIMEDOP:
 175                 err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
 176                                             compat_ptr(fifth));
 177                 break;
 178         case SEMGET:
 179                 err = sys_semget(first, second, third);
 180                 break;
 181         case SEMCTL:
 182                 err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
 183                 break;
 184         case MSGSND:
 185                 err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
 186                 break;
 187         case MSGRCV:
 188                 err = compat_sys_msgrcv(first, second, fifth, third,
 189                                         version, compat_ptr(ptr));
 190                 break;
 191         case MSGGET:
 192                 err = sys_msgget((key_t) first, second);
 193                 break;
 194         case MSGCTL:
 195                 err = compat_sys_msgctl(first, second, compat_ptr(ptr));
 196                 break;
 197         case SHMAT:
 198                 err = compat_sys_shmat(first, second, third, version,
 199                                        compat_ptr(ptr));
 200                 break;
 201         case SHMDT:
 202                 err = sys_shmdt(compat_ptr(ptr));
 203                 break;
 204         case SHMGET:
 205                 err = sys_shmget(first, (unsigned)second, third);
 206                 break;
 207         case SHMCTL:
 208                 err = compat_sys_shmctl(first, second, compat_ptr(ptr));
 209                 break;
 210         default:
 211                 err = -EINVAL;
 212                 break;
 213         }
 214
 215         return err;
 216 }
 217
 218 #else
 219
 220 SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
 221         u32, ptr, u32, fifth)
 222 {
 223         return -ENOSYS;
 224 }
 225
 226 #endif /* CONFIG_SYSVIPC */
 227
 228 #ifdef CONFIG_MIPS32_N32
 229 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
 230 {
 231         /* compat_sys_semctl expects a pointer to union semun */
 232         u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
 233         if (put_user(arg, uptr))
 234                 return -EFAULT;
 235         return compat_sys_semctl(semid, semnum, cmd, uptr);
 236 }
 237
 238 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
 239         int, msgflg)
 240 {
 241         return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
 242 }
 243
 244 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
 245         int, msgtyp, int, msgflg)
 246 {
 247         return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
 248                                  compat_ptr(msgp));
 249 }
 250 #endif
 251
 252 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 253 {
 254         unsigned int p = personality & 0xffffffff;
 255         int ret;
 256
 257         if (personality(current->personality) == PER_LINUX32 &&
 258             personality(p) == PER_LINUX)
 259                 p = (p & ~PER_MASK) | PER_LINUX32;
 260         ret = sys_personality(p);
 261         if (ret != -1 && personality(ret) == PER_LINUX32)
 262                 ret = (ret & ~PER_MASK) | PER_LINUX;
 263         return ret;
 264 }
 265
 266 SYSCALL_DEFINE4(32_sendfile, long, out_fd, long, in_fd,
 267         compat_off_t __user *, offset, s32, count)
 268 {
 269         mm_segment_t old_fs = get_fs();
 270         int ret;
 271         off_t of;
 272
 273         if (offset && get_user(of, offset))
 274                 return -EFAULT;
 275
 276         set_fs(KERNEL_DS);
 277         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 278         set_fs(old_fs);
 279
 280         if (offset && put_user(of, offset))
 281                 return -EFAULT;
 282
 283         return ret;
 284 }
 285
 286 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 287                                    size_t count)
 288 {
 289         return sys_readahead(fd, merge_64(a2, a3), count);
 290 }
 291
 292 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 293         unsigned long a2, unsigned long a3,
 294         unsigned long a4, unsigned long a5,
 295         int flags)
 296 {
 297         return sys_sync_file_range(fd,
 298                         merge_64(a2, a3), merge_64(a4, a5),
 299                         flags);
 300 }
 301
 302 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 303         unsigned long a2, unsigned long a3,
 304         unsigned long a4, unsigned long a5,
 305         int flags)
 306 {
 307         return sys_fadvise64_64(fd,
 308                         merge_64(a2, a3), merge_64(a4, a5),
 309                         flags);
 310 }
 311
 312 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 313         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 314 {
 315         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 316                              merge_64(len_a4, len_a5));
 317 }
 318
 319 save_static_function(sys32_clone);
 320 static int noinline __used
 321 _sys32_clone(nabi_no_regargs struct pt_regs regs)
 322 {
 323         unsigned long clone_flags;
 324         unsigned long newsp;
 325         int __user *parent_tidptr, *child_tidptr;
 326
 327         clone_flags = regs.regs[4];
 328         newsp = regs.regs[5];
 329         if (!newsp)
 330                 newsp = regs.regs[29];
 331         parent_tidptr = (int __user *) regs.regs[6];
 332
 333         /* Use __dummy4 instead of getting it off the stack, so that
 334            syscall() works.  */
 335         child_tidptr = (int __user *) __dummy4;
 336         return do_fork(clone_flags, newsp, &regs, 0,
 337                        parent_tidptr, child_tidptr);
 338 }
 339
 340 asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
 341         size_t len)
 342 {
 343         return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
 344 }
 345
 346 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
 347                 u64, a3, u64, a4, int, dfd, const char  __user *, pathname)
 348 {
 349         return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
 350                                  dfd, pathname);
 351 }