linux/arch/s390/kernel/compat_linux.c
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   1/*
   2 *  arch/s390x/kernel/linux32.c
   3 *
   4 *  S390 version
   5 *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7 *               Gerhard Tonn (ton@de.ibm.com)   
   8 *               Thomas Spatzier (tspat@de.ibm.com)
   9 *
  10 *  Conversion between 31bit and 64bit native syscalls.
  11 *
  12 * Heavily inspired by the 32-bit Sparc compat code which is 
  13 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  14 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
  15 *
  16 */
  17
  18
  19#include <linux/kernel.h>
  20#include <linux/sched.h>
  21#include <linux/fs.h> 
  22#include <linux/mm.h> 
  23#include <linux/file.h> 
  24#include <linux/signal.h>
  25#include <linux/resource.h>
  26#include <linux/times.h>
  27#include <linux/utsname.h>
  28#include <linux/smp.h>
  29#include <linux/smp_lock.h>
  30#include <linux/sem.h>
  31#include <linux/msg.h>
  32#include <linux/shm.h>
  33#include <linux/slab.h>
  34#include <linux/uio.h>
  35#include <linux/nfs_fs.h>
  36#include <linux/quota.h>
  37#include <linux/module.h>
  38#include <linux/sunrpc/svc.h>
  39#include <linux/nfsd/nfsd.h>
  40#include <linux/nfsd/cache.h>
  41#include <linux/nfsd/xdr.h>
  42#include <linux/nfsd/syscall.h>
  43#include <linux/poll.h>
  44#include <linux/personality.h>
  45#include <linux/stat.h>
  46#include <linux/filter.h>
  47#include <linux/highmem.h>
  48#include <linux/highuid.h>
  49#include <linux/mman.h>
  50#include <linux/ipv6.h>
  51#include <linux/in.h>
  52#include <linux/icmpv6.h>
  53#include <linux/syscalls.h>
  54#include <linux/sysctl.h>
  55#include <linux/binfmts.h>
  56#include <linux/capability.h>
  57#include <linux/compat.h>
  58#include <linux/vfs.h>
  59#include <linux/ptrace.h>
  60#include <linux/fadvise.h>
  61#include <linux/ipc.h>
  62
  63#include <asm/types.h>
  64#include <asm/uaccess.h>
  65
  66#include <net/scm.h>
  67#include <net/sock.h>
  68
  69#include "compat_linux.h"
  70
  71long psw_user32_bits    = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  72                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  73                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  74long psw32_user_bits    = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
  75                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
  76                           PSW32_MASK_PSTATE);
  77 
  78/* For this source file, we want overflow handling. */
  79
  80#undef high2lowuid
  81#undef high2lowgid
  82#undef low2highuid
  83#undef low2highgid
  84#undef SET_UID16
  85#undef SET_GID16
  86#undef NEW_TO_OLD_UID
  87#undef NEW_TO_OLD_GID
  88#undef SET_OLDSTAT_UID
  89#undef SET_OLDSTAT_GID
  90#undef SET_STAT_UID
  91#undef SET_STAT_GID
  92
  93#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
  94#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
  95#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
  96#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
  97#define SET_UID16(var, uid)     var = high2lowuid(uid)
  98#define SET_GID16(var, gid)     var = high2lowgid(gid)
  99#define NEW_TO_OLD_UID(uid)     high2lowuid(uid)
 100#define NEW_TO_OLD_GID(gid)     high2lowgid(gid)
 101#define SET_OLDSTAT_UID(stat, uid)      (stat).st_uid = high2lowuid(uid)
 102#define SET_OLDSTAT_GID(stat, gid)      (stat).st_gid = high2lowgid(gid)
 103#define SET_STAT_UID(stat, uid)         (stat).st_uid = high2lowuid(uid)
 104#define SET_STAT_GID(stat, gid)         (stat).st_gid = high2lowgid(gid)
 105
 106asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
 107{
 108        return sys_chown(filename, low2highuid(user), low2highgid(group));
 109}
 110
 111asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
 112{
 113        return sys_lchown(filename, low2highuid(user), low2highgid(group));
 114}
 115
 116asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
 117{
 118        return sys_fchown(fd, low2highuid(user), low2highgid(group));
 119}
 120
 121asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
 122{
 123        return sys_setregid(low2highgid(rgid), low2highgid(egid));
 124}
 125
 126asmlinkage long sys32_setgid16(u16 gid)
 127{
 128        return sys_setgid((gid_t)gid);
 129}
 130
 131asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
 132{
 133        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 134}
 135
 136asmlinkage long sys32_setuid16(u16 uid)
 137{
 138        return sys_setuid((uid_t)uid);
 139}
 140
 141asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
 142{
 143        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 144                low2highuid(suid));
 145}
 146
 147asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
 148{
 149        int retval;
 150
 151        if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
 152            !(retval = put_user(high2lowuid(current->euid), euid)))
 153                retval = put_user(high2lowuid(current->suid), suid);
 154
 155        return retval;
 156}
 157
 158asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
 159{
 160        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 161                low2highgid(sgid));
 162}
 163
 164asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
 165{
 166        int retval;
 167
 168        if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
 169            !(retval = put_user(high2lowgid(current->egid), egid)))
 170                retval = put_user(high2lowgid(current->sgid), sgid);
 171
 172        return retval;
 173}
 174
 175asmlinkage long sys32_setfsuid16(u16 uid)
 176{
 177        return sys_setfsuid((uid_t)uid);
 178}
 179
 180asmlinkage long sys32_setfsgid16(u16 gid)
 181{
 182        return sys_setfsgid((gid_t)gid);
 183}
 184
 185static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
 186{
 187        int i;
 188        u16 group;
 189
 190        for (i = 0; i < group_info->ngroups; i++) {
 191                group = (u16)GROUP_AT(group_info, i);
 192                if (put_user(group, grouplist+i))
 193                        return -EFAULT;
 194        }
 195
 196        return 0;
 197}
 198
 199static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
 200{
 201        int i;
 202        u16 group;
 203
 204        for (i = 0; i < group_info->ngroups; i++) {
 205                if (get_user(group, grouplist+i))
 206                        return  -EFAULT;
 207                GROUP_AT(group_info, i) = (gid_t)group;
 208        }
 209
 210        return 0;
 211}
 212
 213asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
 214{
 215        int i;
 216
 217        if (gidsetsize < 0)
 218                return -EINVAL;
 219
 220        get_group_info(current->group_info);
 221        i = current->group_info->ngroups;
 222        if (gidsetsize) {
 223                if (i > gidsetsize) {
 224                        i = -EINVAL;
 225                        goto out;
 226                }
 227                if (groups16_to_user(grouplist, current->group_info)) {
 228                        i = -EFAULT;
 229                        goto out;
 230                }
 231        }
 232out:
 233        put_group_info(current->group_info);
 234        return i;
 235}
 236
 237asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 238{
 239        struct group_info *group_info;
 240        int retval;
 241
 242        if (!capable(CAP_SETGID))
 243                return -EPERM;
 244        if ((unsigned)gidsetsize > NGROUPS_MAX)
 245                return -EINVAL;
 246
 247        group_info = groups_alloc(gidsetsize);
 248        if (!group_info)
 249                return -ENOMEM;
 250        retval = groups16_from_user(group_info, grouplist);
 251        if (retval) {
 252                put_group_info(group_info);
 253                return retval;
 254        }
 255
 256        retval = set_current_groups(group_info);
 257        put_group_info(group_info);
 258
 259        return retval;
 260}
 261
 262asmlinkage long sys32_getuid16(void)
 263{
 264        return high2lowuid(current->uid);
 265}
 266
 267asmlinkage long sys32_geteuid16(void)
 268{
 269        return high2lowuid(current->euid);
 270}
 271
 272asmlinkage long sys32_getgid16(void)
 273{
 274        return high2lowgid(current->gid);
 275}
 276
 277asmlinkage long sys32_getegid16(void)
 278{
 279        return high2lowgid(current->egid);
 280}
 281
 282/*
 283 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 284 *
 285 * This is really horribly ugly.
 286 */
 287#ifdef CONFIG_SYSVIPC
 288asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
 289{
 290        if (call >> 16)         /* hack for backward compatibility */
 291                return -EINVAL;
 292
 293        call &= 0xffff;
 294
 295        switch (call) {
 296        case SEMTIMEDOP:
 297                return compat_sys_semtimedop(first, compat_ptr(ptr),
 298                                             second, compat_ptr(third));
 299        case SEMOP:
 300                /* struct sembuf is the same on 32 and 64bit :)) */
 301                return sys_semtimedop(first, compat_ptr(ptr),
 302                                      second, NULL);
 303        case SEMGET:
 304                return sys_semget(first, second, third);
 305        case SEMCTL:
 306                return compat_sys_semctl(first, second, third,
 307                                         compat_ptr(ptr));
 308        case MSGSND:
 309                return compat_sys_msgsnd(first, second, third,
 310                                         compat_ptr(ptr));
 311        case MSGRCV:
 312                return compat_sys_msgrcv(first, second, 0, third,
 313                                         0, compat_ptr(ptr));
 314        case MSGGET:
 315                return sys_msgget((key_t) first, second);
 316        case MSGCTL:
 317                return compat_sys_msgctl(first, second, compat_ptr(ptr));
 318        case SHMAT:
 319                return compat_sys_shmat(first, second, third,
 320                                        0, compat_ptr(ptr));
 321        case SHMDT:
 322                return sys_shmdt(compat_ptr(ptr));
 323        case SHMGET:
 324                return sys_shmget(first, (unsigned)second, third);
 325        case SHMCTL:
 326                return compat_sys_shmctl(first, second, compat_ptr(ptr));
 327        }
 328
 329        return -ENOSYS;
 330}
 331#endif
 332
 333asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 334{
 335        if ((int)high < 0)
 336                return -EINVAL;
 337        else
 338                return sys_truncate(path, (high << 32) | low);
 339}
 340
 341asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 342{
 343        if ((int)high < 0)
 344                return -EINVAL;
 345        else
 346                return sys_ftruncate(fd, (high << 32) | low);
 347}
 348
 349asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 350                                struct compat_timespec __user *interval)
 351{
 352        struct timespec t;
 353        int ret;
 354        mm_segment_t old_fs = get_fs ();
 355        
 356        set_fs (KERNEL_DS);
 357        ret = sys_sched_rr_get_interval(pid,
 358                                        (struct timespec __force __user *) &t);
 359        set_fs (old_fs);
 360        if (put_compat_timespec(&t, interval))
 361                return -EFAULT;
 362        return ret;
 363}
 364
 365asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 366                        compat_sigset_t __user *oset, size_t sigsetsize)
 367{
 368        sigset_t s;
 369        compat_sigset_t s32;
 370        int ret;
 371        mm_segment_t old_fs = get_fs();
 372        
 373        if (set) {
 374                if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 375                        return -EFAULT;
 376                switch (_NSIG_WORDS) {
 377                case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
 378                case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
 379                case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
 380                case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 381                }
 382        }
 383        set_fs (KERNEL_DS);
 384        ret = sys_rt_sigprocmask(how,
 385                                 set ? (sigset_t __force __user *) &s : NULL,
 386                                 oset ? (sigset_t __force __user *) &s : NULL,
 387                                 sigsetsize);
 388        set_fs (old_fs);
 389        if (ret) return ret;
 390        if (oset) {
 391                switch (_NSIG_WORDS) {
 392                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 393                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 394                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 395                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 396                }
 397                if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 398                        return -EFAULT;
 399        }
 400        return 0;
 401}
 402
 403asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 404                                size_t sigsetsize)
 405{
 406        sigset_t s;
 407        compat_sigset_t s32;
 408        int ret;
 409        mm_segment_t old_fs = get_fs();
 410                
 411        set_fs (KERNEL_DS);
 412        ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 413        set_fs (old_fs);
 414        if (!ret) {
 415                switch (_NSIG_WORDS) {
 416                case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
 417                case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
 418                case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
 419                case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
 420                }
 421                if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 422                        return -EFAULT;
 423        }
 424        return ret;
 425}
 426
 427asmlinkage long
 428sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 429{
 430        siginfo_t info;
 431        int ret;
 432        mm_segment_t old_fs = get_fs();
 433        
 434        if (copy_siginfo_from_user32(&info, uinfo))
 435                return -EFAULT;
 436        set_fs (KERNEL_DS);
 437        ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
 438        set_fs (old_fs);
 439        return ret;
 440}
 441
 442/*
 443 * sys32_execve() executes a new program after the asm stub has set
 444 * things up for us.  This should basically do what I want it to.
 445 */
 446asmlinkage long sys32_execve(void)
 447{
 448        struct pt_regs *regs = task_pt_regs(current);
 449        char *filename;
 450        unsigned long result;
 451        int rc;
 452
 453        filename = getname(compat_ptr(regs->orig_gpr2));
 454        if (IS_ERR(filename)) {
 455                result = PTR_ERR(filename);
 456                goto out;
 457        }
 458        rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
 459                              compat_ptr(regs->gprs[4]), regs);
 460        if (rc) {
 461                result = rc;
 462                goto out_putname;
 463        }
 464        task_lock(current);
 465        current->ptrace &= ~PT_DTRACE;
 466        task_unlock(current);
 467        current->thread.fp_regs.fpc=0;
 468        asm volatile("sfpc %0,0" : : "d" (0));
 469        result = regs->gprs[2];
 470out_putname:
 471        putname(filename);
 472out:
 473        return result;
 474}
 475
 476
 477#ifdef CONFIG_MODULES
 478
 479asmlinkage long
 480sys32_init_module(void __user *umod, unsigned long len,
 481                const char __user *uargs)
 482{
 483        return sys_init_module(umod, len, uargs);
 484}
 485
 486asmlinkage long
 487sys32_delete_module(const char __user *name_user, unsigned int flags)
 488{
 489        return sys_delete_module(name_user, flags);
 490}
 491
 492#else /* CONFIG_MODULES */
 493
 494asmlinkage long
 495sys32_init_module(void __user *umod, unsigned long len,
 496                const char __user *uargs)
 497{
 498        return -ENOSYS;
 499}
 500
 501asmlinkage long
 502sys32_delete_module(const char __user *name_user, unsigned int flags)
 503{
 504        return -ENOSYS;
 505}
 506
 507#endif  /* CONFIG_MODULES */
 508
 509asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 510                                size_t count, u32 poshi, u32 poslo)
 511{
 512        if ((compat_ssize_t) count < 0)
 513                return -EINVAL;
 514        return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 515}
 516
 517asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 518                                size_t count, u32 poshi, u32 poslo)
 519{
 520        if ((compat_ssize_t) count < 0)
 521                return -EINVAL;
 522        return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 523}
 524
 525asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 526{
 527        return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 528}
 529
 530asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
 531{
 532        mm_segment_t old_fs = get_fs();
 533        int ret;
 534        off_t of;
 535        
 536        if (offset && get_user(of, offset))
 537                return -EFAULT;
 538                
 539        set_fs(KERNEL_DS);
 540        ret = sys_sendfile(out_fd, in_fd,
 541                           offset ? (off_t __force __user *) &of : NULL, count);
 542        set_fs(old_fs);
 543        
 544        if (offset && put_user(of, offset))
 545                return -EFAULT;
 546                
 547        return ret;
 548}
 549
 550asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
 551                                compat_loff_t __user *offset, s32 count)
 552{
 553        mm_segment_t old_fs = get_fs();
 554        int ret;
 555        loff_t lof;
 556        
 557        if (offset && get_user(lof, offset))
 558                return -EFAULT;
 559                
 560        set_fs(KERNEL_DS);
 561        ret = sys_sendfile64(out_fd, in_fd,
 562                             offset ? (loff_t __force __user *) &lof : NULL,
 563                             count);
 564        set_fs(old_fs);
 565        
 566        if (offset && put_user(lof, offset))
 567                return -EFAULT;
 568                
 569        return ret;
 570}
 571
 572#ifdef CONFIG_SYSCTL_SYSCALL
 573struct __sysctl_args32 {
 574        u32 name;
 575        int nlen;
 576        u32 oldval;
 577        u32 oldlenp;
 578        u32 newval;
 579        u32 newlen;
 580        u32 __unused[4];
 581};
 582
 583asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 584{
 585        struct __sysctl_args32 tmp;
 586        int error;
 587        size_t oldlen;
 588        size_t __user *oldlenp = NULL;
 589        unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
 590
 591        if (copy_from_user(&tmp, args, sizeof(tmp)))
 592                return -EFAULT;
 593
 594        if (tmp.oldval && tmp.oldlenp) {
 595                /* Duh, this is ugly and might not work if sysctl_args
 596                   is in read-only memory, but do_sysctl does indirectly
 597                   a lot of uaccess in both directions and we'd have to
 598                   basically copy the whole sysctl.c here, and
 599                   glibc's __sysctl uses rw memory for the structure
 600                   anyway.  */
 601                if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
 602                    put_user(oldlen, (size_t __user *)addr))
 603                        return -EFAULT;
 604                oldlenp = (size_t __user *)addr;
 605        }
 606
 607        lock_kernel();
 608        error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
 609                          oldlenp, compat_ptr(tmp.newval), tmp.newlen);
 610        unlock_kernel();
 611        if (oldlenp) {
 612                if (!error) {
 613                        if (get_user(oldlen, (size_t __user *)addr) ||
 614                            put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
 615                                error = -EFAULT;
 616                }
 617                if (copy_to_user(args->__unused, tmp.__unused,
 618                                 sizeof(tmp.__unused)))
 619                        error = -EFAULT;
 620        }
 621        return error;
 622}
 623#endif
 624
 625struct stat64_emu31 {
 626        unsigned long long  st_dev;
 627        unsigned int    __pad1;
 628#define STAT64_HAS_BROKEN_ST_INO        1
 629        u32             __st_ino;
 630        unsigned int    st_mode;
 631        unsigned int    st_nlink;
 632        u32             st_uid;
 633        u32             st_gid;
 634        unsigned long long  st_rdev;
 635        unsigned int    __pad3;
 636        long            st_size;
 637        u32             st_blksize;
 638        unsigned char   __pad4[4];
 639        u32             __pad5;     /* future possible st_blocks high bits */
 640        u32             st_blocks;  /* Number 512-byte blocks allocated. */
 641        u32             st_atime;
 642        u32             __pad6;
 643        u32             st_mtime;
 644        u32             __pad7;
 645        u32             st_ctime;
 646        u32             __pad8;     /* will be high 32 bits of ctime someday */
 647        unsigned long   st_ino;
 648};      
 649
 650static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 651{
 652        struct stat64_emu31 tmp;
 653
 654        memset(&tmp, 0, sizeof(tmp));
 655
 656        tmp.st_dev = huge_encode_dev(stat->dev);
 657        tmp.st_ino = stat->ino;
 658        tmp.__st_ino = (u32)stat->ino;
 659        tmp.st_mode = stat->mode;
 660        tmp.st_nlink = (unsigned int)stat->nlink;
 661        tmp.st_uid = stat->uid;
 662        tmp.st_gid = stat->gid;
 663        tmp.st_rdev = huge_encode_dev(stat->rdev);
 664        tmp.st_size = stat->size;
 665        tmp.st_blksize = (u32)stat->blksize;
 666        tmp.st_blocks = (u32)stat->blocks;
 667        tmp.st_atime = (u32)stat->atime.tv_sec;
 668        tmp.st_mtime = (u32)stat->mtime.tv_sec;
 669        tmp.st_ctime = (u32)stat->ctime.tv_sec;
 670
 671        return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
 672}
 673
 674asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
 675{
 676        struct kstat stat;
 677        int ret = vfs_stat(filename, &stat);
 678        if (!ret)
 679                ret = cp_stat64(statbuf, &stat);
 680        return ret;
 681}
 682
 683asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
 684{
 685        struct kstat stat;
 686        int ret = vfs_lstat(filename, &stat);
 687        if (!ret)
 688                ret = cp_stat64(statbuf, &stat);
 689        return ret;
 690}
 691
 692asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 693{
 694        struct kstat stat;
 695        int ret = vfs_fstat(fd, &stat);
 696        if (!ret)
 697                ret = cp_stat64(statbuf, &stat);
 698        return ret;
 699}
 700
 701asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
 702                                struct stat64_emu31 __user* statbuf, int flag)
 703{
 704        struct kstat stat;
 705        int error = -EINVAL;
 706
 707        if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
 708                goto out;
 709
 710        if (flag & AT_SYMLINK_NOFOLLOW)
 711                error = vfs_lstat_fd(dfd, filename, &stat);
 712        else
 713                error = vfs_stat_fd(dfd, filename, &stat);
 714
 715        if (!error)
 716                error = cp_stat64(statbuf, &stat);
 717out:
 718        return error;
 719}
 720
 721/*
 722 * Linux/i386 didn't use to be able to handle more than
 723 * 4 system call parameters, so these system calls used a memory
 724 * block for parameter passing..
 725 */
 726
 727struct mmap_arg_struct_emu31 {
 728        u32     addr;
 729        u32     len;
 730        u32     prot;
 731        u32     flags;
 732        u32     fd;
 733        u32     offset;
 734};
 735
 736/* common code for old and new mmaps */
 737static inline long do_mmap2(
 738        unsigned long addr, unsigned long len,
 739        unsigned long prot, unsigned long flags,
 740        unsigned long fd, unsigned long pgoff)
 741{
 742        struct file * file = NULL;
 743        unsigned long error = -EBADF;
 744
 745        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 746        if (!(flags & MAP_ANONYMOUS)) {
 747                file = fget(fd);
 748                if (!file)
 749                        goto out;
 750        }
 751
 752        down_write(&current->mm->mmap_sem);
 753        error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 754        if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
 755                /* Result is out of bounds.  */
 756                do_munmap(current->mm, addr, len);
 757                error = -ENOMEM;
 758        }
 759        up_write(&current->mm->mmap_sem);
 760
 761        if (file)
 762                fput(file);
 763out:    
 764        return error;
 765}
 766
 767
 768asmlinkage unsigned long
 769old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 770{
 771        struct mmap_arg_struct_emu31 a;
 772        int error = -EFAULT;
 773
 774        if (copy_from_user(&a, arg, sizeof(a)))
 775                goto out;
 776
 777        error = -EINVAL;
 778        if (a.offset & ~PAGE_MASK)
 779                goto out;
 780
 781        error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 
 782out:
 783        return error;
 784}
 785
 786asmlinkage long 
 787sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 788{
 789        struct mmap_arg_struct_emu31 a;
 790        int error = -EFAULT;
 791
 792        if (copy_from_user(&a, arg, sizeof(a)))
 793                goto out;
 794        error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 795out:
 796        return error;
 797}
 798
 799asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 800{
 801        if ((compat_ssize_t) count < 0)
 802                return -EINVAL; 
 803
 804        return sys_read(fd, buf, count);
 805}
 806
 807asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
 808{
 809        if ((compat_ssize_t) count < 0)
 810                return -EINVAL; 
 811
 812        return sys_write(fd, buf, count);
 813}
 814
 815asmlinkage long sys32_clone(void)
 816{
 817        struct pt_regs *regs = task_pt_regs(current);
 818        unsigned long clone_flags;
 819        unsigned long newsp;
 820        int __user *parent_tidptr, *child_tidptr;
 821
 822        clone_flags = regs->gprs[3] & 0xffffffffUL;
 823        newsp = regs->orig_gpr2 & 0x7fffffffUL;
 824        parent_tidptr = compat_ptr(regs->gprs[4]);
 825        child_tidptr = compat_ptr(regs->gprs[5]);
 826        if (!newsp)
 827                newsp = regs->gprs[15];
 828        return do_fork(clone_flags, newsp, regs, 0,
 829                       parent_tidptr, child_tidptr);
 830}
 831
 832/*
 833 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 834 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 835 * because the 31 bit values differ from the 64 bit values.
 836 */
 837
 838asmlinkage long
 839sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 840{
 841        if (advise == 4)
 842                advise = POSIX_FADV_DONTNEED;
 843        else if (advise == 5)
 844                advise = POSIX_FADV_NOREUSE;
 845        return sys_fadvise64(fd, offset, len, advise);
 846}
 847
 848struct fadvise64_64_args {
 849        int fd;
 850        long long offset;
 851        long long len;
 852        int advice;
 853};
 854
 855asmlinkage long
 856sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 857{
 858        struct fadvise64_64_args a;
 859
 860        if ( copy_from_user(&a, args, sizeof(a)) )
 861                return -EFAULT;
 862        if (a.advice == 4)
 863                a.advice = POSIX_FADV_DONTNEED;
 864        else if (a.advice == 5)
 865                a.advice = POSIX_FADV_NOREUSE;
 866        return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 867}
 868