2 * arch/s390x/kernel/linux32.c
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)
10 * Conversion between 31bit and 64bit native syscalls.
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)
19 #include <linux/kernel.h>
20 #include <linux/sched.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>
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>
62 #include <asm/types.h>
64 #include <asm/uaccess.h>
65 #include <asm/semaphore.h>
70 #include "compat_linux.h"
73 /* For this source file, we want overflow handling. */
83 #undef SET_OLDSTAT_UID
84 #undef SET_OLDSTAT_GID
88 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
89 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
90 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
91 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
92 #define SET_UID16(var, uid) var = high2lowuid(uid)
93 #define SET_GID16(var, gid) var = high2lowgid(gid)
94 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
95 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
96 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
97 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
98 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
99 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
101 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
103 return sys_chown(filename, low2highuid(user), low2highgid(group));
106 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
108 return sys_lchown(filename, low2highuid(user), low2highgid(group));
111 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
113 return sys_fchown(fd, low2highuid(user), low2highgid(group));
116 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
118 return sys_setregid(low2highgid(rgid), low2highgid(egid));
121 asmlinkage long sys32_setgid16(u16 gid)
123 return sys_setgid((gid_t)gid);
126 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
128 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
131 asmlinkage long sys32_setuid16(u16 uid)
133 return sys_setuid((uid_t)uid);
136 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
138 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
142 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
146 if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
147 !(retval = put_user(high2lowuid(current->euid), euid)))
148 retval = put_user(high2lowuid(current->suid), suid);
153 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
155 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
159 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
163 if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
164 !(retval = put_user(high2lowgid(current->egid), egid)))
165 retval = put_user(high2lowgid(current->sgid), sgid);
170 asmlinkage long sys32_setfsuid16(u16 uid)
172 return sys_setfsuid((uid_t)uid);
175 asmlinkage long sys32_setfsgid16(u16 gid)
177 return sys_setfsgid((gid_t)gid);
180 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
185 for (i = 0; i < group_info->ngroups; i++) {
186 group = (u16)GROUP_AT(group_info, i);
187 if (put_user(group, grouplist+i))
194 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
199 for (i = 0; i < group_info->ngroups; i++) {
200 if (get_user(group, grouplist+i))
202 GROUP_AT(group_info, i) = (gid_t)group;
208 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
215 get_group_info(current->group_info);
216 i = current->group_info->ngroups;
218 if (i > gidsetsize) {
222 if (groups16_to_user(grouplist, current->group_info)) {
228 put_group_info(current->group_info);
232 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
234 struct group_info *group_info;
237 if (!capable(CAP_SETGID))
239 if ((unsigned)gidsetsize > NGROUPS_MAX)
242 group_info = groups_alloc(gidsetsize);
245 retval = groups16_from_user(group_info, grouplist);
247 put_group_info(group_info);
251 retval = set_current_groups(group_info);
252 put_group_info(group_info);
257 asmlinkage long sys32_getuid16(void)
259 return high2lowuid(current->uid);
262 asmlinkage long sys32_geteuid16(void)
264 return high2lowuid(current->euid);
267 asmlinkage long sys32_getgid16(void)
269 return high2lowgid(current->gid);
272 asmlinkage long sys32_getegid16(void)
274 return high2lowgid(current->egid);
277 /* 32-bit timeval and related flotsam. */
279 static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
281 return (!access_ok(VERIFY_READ, o, sizeof(*o)) ||
282 (__get_user(o->tv_sec, &i->tv_sec) ||
283 __get_user(o->tv_usec, &i->tv_usec)));
286 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
288 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
289 (__put_user(i->tv_sec, &o->tv_sec) ||
290 __put_user(i->tv_usec, &o->tv_usec)));
294 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
296 * This is really horribly ugly.
298 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
300 if (call >> 16) /* hack for backward compatibility */
307 return compat_sys_semtimedop(first, compat_ptr(ptr),
308 second, compat_ptr(third));
310 /* struct sembuf is the same on 32 and 64bit :)) */
311 return sys_semtimedop(first, compat_ptr(ptr),
314 return sys_semget(first, second, third);
316 return compat_sys_semctl(first, second, third,
319 return compat_sys_msgsnd(first, second, third,
322 return compat_sys_msgrcv(first, second, 0, third,
325 return sys_msgget((key_t) first, second);
327 return compat_sys_msgctl(first, second, compat_ptr(ptr));
329 return compat_sys_shmat(first, second, third,
332 return sys_shmdt(compat_ptr(ptr));
334 return sys_shmget(first, (unsigned)second, third);
336 return compat_sys_shmctl(first, second, compat_ptr(ptr));
342 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
347 return sys_truncate(path, (high << 32) | low);
350 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
355 return sys_ftruncate(fd, (high << 32) | low);
358 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
362 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
365 err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
366 err |= put_user(stat->ino, &statbuf->st_ino);
367 err |= put_user(stat->mode, &statbuf->st_mode);
368 err |= put_user(stat->nlink, &statbuf->st_nlink);
369 err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
370 err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
371 err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
372 err |= put_user(stat->size, &statbuf->st_size);
373 err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
374 err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
375 err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
376 err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
377 err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
378 err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
379 err |= put_user(stat->blksize, &statbuf->st_blksize);
380 err |= put_user(stat->blocks, &statbuf->st_blocks);
382 err |= put_user(0, &statbuf->__unused4[0]);
383 err |= put_user(0, &statbuf->__unused4[1]);
397 unsigned short procs;
401 unsigned int mem_unit;
405 asmlinkage long sys32_sysinfo(struct sysinfo32 __user *info)
409 mm_segment_t old_fs = get_fs ();
412 ret = sys_sysinfo((struct sysinfo __user *) &s);
414 err = put_user (s.uptime, &info->uptime);
415 err |= __put_user (s.loads[0], &info->loads[0]);
416 err |= __put_user (s.loads[1], &info->loads[1]);
417 err |= __put_user (s.loads[2], &info->loads[2]);
418 err |= __put_user (s.totalram, &info->totalram);
419 err |= __put_user (s.freeram, &info->freeram);
420 err |= __put_user (s.sharedram, &info->sharedram);
421 err |= __put_user (s.bufferram, &info->bufferram);
422 err |= __put_user (s.totalswap, &info->totalswap);
423 err |= __put_user (s.freeswap, &info->freeswap);
424 err |= __put_user (s.procs, &info->procs);
425 err |= __put_user (s.totalhigh, &info->totalhigh);
426 err |= __put_user (s.freehigh, &info->freehigh);
427 err |= __put_user (s.mem_unit, &info->mem_unit);
433 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
434 struct compat_timespec __user *interval)
438 mm_segment_t old_fs = get_fs ();
441 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *) &t);
443 if (put_compat_timespec(&t, interval))
448 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
449 compat_sigset_t __user *oset, size_t sigsetsize)
454 mm_segment_t old_fs = get_fs();
457 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
459 switch (_NSIG_WORDS) {
460 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
461 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
462 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
463 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
467 ret = sys_rt_sigprocmask(how,
468 set ? (sigset_t __user *) &s : NULL,
469 oset ? (sigset_t __user *) &s : NULL,
474 switch (_NSIG_WORDS) {
475 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
476 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
477 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
478 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
480 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
486 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
492 mm_segment_t old_fs = get_fs();
495 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
498 switch (_NSIG_WORDS) {
499 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
500 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
501 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
502 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
504 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
511 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
515 mm_segment_t old_fs = get_fs();
517 if (copy_siginfo_from_user32(&info, uinfo))
520 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
526 * sys32_execve() executes a new program after the asm stub has set
527 * things up for us. This should basically do what I want it to.
530 sys32_execve(struct pt_regs regs)
535 filename = getname(compat_ptr(regs.orig_gpr2));
536 error = PTR_ERR(filename);
537 if (IS_ERR(filename))
539 error = compat_do_execve(filename, compat_ptr(regs.gprs[3]),
540 compat_ptr(regs.gprs[4]), ®s);
544 current->ptrace &= ~PT_DTRACE;
545 task_unlock(current);
546 current->thread.fp_regs.fpc=0;
558 #ifdef CONFIG_MODULES
561 sys32_init_module(void __user *umod, unsigned long len,
562 const char __user *uargs)
564 return sys_init_module(umod, len, uargs);
568 sys32_delete_module(const char __user *name_user, unsigned int flags)
570 return sys_delete_module(name_user, flags);
573 #else /* CONFIG_MODULES */
576 sys32_init_module(void __user *umod, unsigned long len,
577 const char __user *uargs)
583 sys32_delete_module(const char __user *name_user, unsigned int flags)
588 #endif /* CONFIG_MODULES */
590 /* Translations due to time_t size differences. Which affects all
591 sorts of things, like timeval and itimerval. */
593 extern struct timezone sys_tz;
595 asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
599 do_gettimeofday(&ktv);
600 if (put_tv32(tv, &ktv))
604 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
610 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
614 if (!access_ok(VERIFY_READ, i, sizeof(*i)))
616 if (__get_user(o->tv_sec, &i->tv_sec))
618 if (__get_user(usec, &i->tv_usec))
620 o->tv_nsec = usec * 1000;
624 asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
630 if (get_ts32(&kts, tv))
634 if (copy_from_user(&ktz, tz, sizeof(ktz)))
638 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
641 /* These are here just in case some old sparc32 binary calls it. */
642 asmlinkage long sys32_pause(void)
644 current->state = TASK_INTERRUPTIBLE;
646 return -ERESTARTNOHAND;
649 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
650 size_t count, u32 poshi, u32 poslo)
652 if ((compat_ssize_t) count < 0)
654 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
657 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
658 size_t count, u32 poshi, u32 poslo)
660 if ((compat_ssize_t) count < 0)
662 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
665 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
667 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
670 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
672 mm_segment_t old_fs = get_fs();
676 if (offset && get_user(of, offset))
680 ret = sys_sendfile(out_fd, in_fd,
681 offset ? (off_t __user *) &of : NULL, count);
684 if (offset && put_user(of, offset))
690 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
691 compat_loff_t __user *offset, s32 count)
693 mm_segment_t old_fs = get_fs();
697 if (offset && get_user(lof, offset))
701 ret = sys_sendfile64(out_fd, in_fd,
702 offset ? (loff_t __user *) &lof : NULL, count);
705 if (offset && put_user(lof, offset))
711 #ifdef CONFIG_SYSCTL_SYSCALL
712 struct __sysctl_args32 {
722 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
724 struct __sysctl_args32 tmp;
727 size_t __user *oldlenp = NULL;
728 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
730 if (copy_from_user(&tmp, args, sizeof(tmp)))
733 if (tmp.oldval && tmp.oldlenp) {
734 /* Duh, this is ugly and might not work if sysctl_args
735 is in read-only memory, but do_sysctl does indirectly
736 a lot of uaccess in both directions and we'd have to
737 basically copy the whole sysctl.c here, and
738 glibc's __sysctl uses rw memory for the structure
740 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
741 put_user(oldlen, (size_t __user *)addr))
743 oldlenp = (size_t __user *)addr;
747 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
748 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
752 if (get_user(oldlen, (size_t __user *)addr) ||
753 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
756 copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
762 struct stat64_emu31 {
763 unsigned long long st_dev;
765 #define STAT64_HAS_BROKEN_ST_INO 1
767 unsigned int st_mode;
768 unsigned int st_nlink;
771 unsigned long long st_rdev;
775 unsigned char __pad4[4];
776 u32 __pad5; /* future possible st_blocks high bits */
777 u32 st_blocks; /* Number 512-byte blocks allocated. */
783 u32 __pad8; /* will be high 32 bits of ctime someday */
784 unsigned long st_ino;
787 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
789 struct stat64_emu31 tmp;
791 memset(&tmp, 0, sizeof(tmp));
793 tmp.st_dev = huge_encode_dev(stat->dev);
794 tmp.st_ino = stat->ino;
795 tmp.__st_ino = (u32)stat->ino;
796 tmp.st_mode = stat->mode;
797 tmp.st_nlink = (unsigned int)stat->nlink;
798 tmp.st_uid = stat->uid;
799 tmp.st_gid = stat->gid;
800 tmp.st_rdev = huge_encode_dev(stat->rdev);
801 tmp.st_size = stat->size;
802 tmp.st_blksize = (u32)stat->blksize;
803 tmp.st_blocks = (u32)stat->blocks;
804 tmp.st_atime = (u32)stat->atime.tv_sec;
805 tmp.st_mtime = (u32)stat->mtime.tv_sec;
806 tmp.st_ctime = (u32)stat->ctime.tv_sec;
808 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
811 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
814 int ret = vfs_stat(filename, &stat);
816 ret = cp_stat64(statbuf, &stat);
820 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
823 int ret = vfs_lstat(filename, &stat);
825 ret = cp_stat64(statbuf, &stat);
829 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
832 int ret = vfs_fstat(fd, &stat);
834 ret = cp_stat64(statbuf, &stat);
838 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
839 struct stat64_emu31 __user* statbuf, int flag)
844 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
847 if (flag & AT_SYMLINK_NOFOLLOW)
848 error = vfs_lstat_fd(dfd, filename, &stat);
850 error = vfs_stat_fd(dfd, filename, &stat);
853 error = cp_stat64(statbuf, &stat);
859 * Linux/i386 didn't use to be able to handle more than
860 * 4 system call parameters, so these system calls used a memory
861 * block for parameter passing..
864 struct mmap_arg_struct_emu31 {
873 /* common code for old and new mmaps */
874 static inline long do_mmap2(
875 unsigned long addr, unsigned long len,
876 unsigned long prot, unsigned long flags,
877 unsigned long fd, unsigned long pgoff)
879 struct file * file = NULL;
880 unsigned long error = -EBADF;
882 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
883 if (!(flags & MAP_ANONYMOUS)) {
889 down_write(¤t->mm->mmap_sem);
890 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
891 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
892 /* Result is out of bounds. */
893 do_munmap(current->mm, addr, len);
896 up_write(¤t->mm->mmap_sem);
905 asmlinkage unsigned long
906 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
908 struct mmap_arg_struct_emu31 a;
911 if (copy_from_user(&a, arg, sizeof(a)))
915 if (a.offset & ~PAGE_MASK)
918 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
924 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
926 struct mmap_arg_struct_emu31 a;
929 if (copy_from_user(&a, arg, sizeof(a)))
931 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
936 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
938 if ((compat_ssize_t) count < 0)
941 return sys_read(fd, buf, count);
944 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
946 if ((compat_ssize_t) count < 0)
949 return sys_write(fd, buf, count);
952 asmlinkage long sys32_clone(struct pt_regs regs)
954 unsigned long clone_flags;
956 int __user *parent_tidptr, *child_tidptr;
958 clone_flags = regs.gprs[3] & 0xffffffffUL;
959 newsp = regs.orig_gpr2 & 0x7fffffffUL;
960 parent_tidptr = compat_ptr(regs.gprs[4]);
961 child_tidptr = compat_ptr(regs.gprs[5]);
963 newsp = regs.gprs[15];
964 return do_fork(clone_flags, newsp, ®s, 0,
965 parent_tidptr, child_tidptr);
969 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
970 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
971 * because the 31 bit values differ from the 64 bit values.
975 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
978 advise = POSIX_FADV_DONTNEED;
979 else if (advise == 5)
980 advise = POSIX_FADV_NOREUSE;
981 return sys_fadvise64(fd, offset, len, advise);
984 struct fadvise64_64_args {
992 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
994 struct fadvise64_64_args a;
996 if ( copy_from_user(&a, args, sizeof(a)) )
999 a.advice = POSIX_FADV_DONTNEED;
1000 else if (a.advice == 5)
1001 a.advice = POSIX_FADV_NOREUSE;
1002 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);