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>
61 #include <linux/ipc.h>
63 #include <asm/types.h>
64 #include <asm/uaccess.h>
69 #include "compat_linux.h"
71 long 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);
74 long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
75 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
78 /* For this source file, we want overflow handling. */
88 #undef SET_OLDSTAT_UID
89 #undef SET_OLDSTAT_GID
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)
106 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
108 return sys_chown(filename, low2highuid(user), low2highgid(group));
111 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
113 return sys_lchown(filename, low2highuid(user), low2highgid(group));
116 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
118 return sys_fchown(fd, low2highuid(user), low2highgid(group));
121 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
123 return sys_setregid(low2highgid(rgid), low2highgid(egid));
126 asmlinkage long sys32_setgid16(u16 gid)
128 return sys_setgid((gid_t)gid);
131 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
133 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
136 asmlinkage long sys32_setuid16(u16 uid)
138 return sys_setuid((uid_t)uid);
141 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
143 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
147 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
151 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
152 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
153 retval = put_user(high2lowuid(current->cred->suid), suid);
158 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
160 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
164 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
168 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
169 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
170 retval = put_user(high2lowgid(current->cred->sgid), sgid);
175 asmlinkage long sys32_setfsuid16(u16 uid)
177 return sys_setfsuid((uid_t)uid);
180 asmlinkage long sys32_setfsgid16(u16 gid)
182 return sys_setfsgid((gid_t)gid);
185 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
190 for (i = 0; i < group_info->ngroups; i++) {
191 group = (u16)GROUP_AT(group_info, i);
192 if (put_user(group, grouplist+i))
199 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
204 for (i = 0; i < group_info->ngroups; i++) {
205 if (get_user(group, grouplist+i))
207 GROUP_AT(group_info, i) = (gid_t)group;
213 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
220 get_group_info(current->cred->group_info);
221 i = current->cred->group_info->ngroups;
223 if (i > gidsetsize) {
227 if (groups16_to_user(grouplist, current->cred->group_info)) {
233 put_group_info(current->cred->group_info);
237 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
239 struct group_info *group_info;
242 if (!capable(CAP_SETGID))
244 if ((unsigned)gidsetsize > NGROUPS_MAX)
247 group_info = groups_alloc(gidsetsize);
250 retval = groups16_from_user(group_info, grouplist);
252 put_group_info(group_info);
256 retval = set_current_groups(group_info);
257 put_group_info(group_info);
262 asmlinkage long sys32_getuid16(void)
264 return high2lowuid(current->cred->uid);
267 asmlinkage long sys32_geteuid16(void)
269 return high2lowuid(current->cred->euid);
272 asmlinkage long sys32_getgid16(void)
274 return high2lowgid(current->cred->gid);
277 asmlinkage long sys32_getegid16(void)
279 return high2lowgid(current->cred->egid);
283 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
285 * This is really horribly ugly.
287 #ifdef CONFIG_SYSVIPC
288 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
290 if (call >> 16) /* hack for backward compatibility */
297 return compat_sys_semtimedop(first, compat_ptr(ptr),
298 second, compat_ptr(third));
300 /* struct sembuf is the same on 32 and 64bit :)) */
301 return sys_semtimedop(first, compat_ptr(ptr),
304 return sys_semget(first, second, third);
306 return compat_sys_semctl(first, second, third,
309 return compat_sys_msgsnd(first, second, third,
312 return compat_sys_msgrcv(first, second, 0, third,
315 return sys_msgget((key_t) first, second);
317 return compat_sys_msgctl(first, second, compat_ptr(ptr));
319 return compat_sys_shmat(first, second, third,
322 return sys_shmdt(compat_ptr(ptr));
324 return sys_shmget(first, (unsigned)second, third);
326 return compat_sys_shmctl(first, second, compat_ptr(ptr));
333 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
338 return sys_truncate(path, (high << 32) | low);
341 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
346 return sys_ftruncate(fd, (high << 32) | low);
349 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
350 struct compat_timespec __user *interval)
354 mm_segment_t old_fs = get_fs ();
357 ret = sys_sched_rr_get_interval(pid,
358 (struct timespec __force __user *) &t);
360 if (put_compat_timespec(&t, interval))
365 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
366 compat_sigset_t __user *oset, size_t sigsetsize)
371 mm_segment_t old_fs = get_fs();
374 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
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);
384 ret = sys_rt_sigprocmask(how,
385 set ? (sigset_t __force __user *) &s : NULL,
386 oset ? (sigset_t __force __user *) &s : NULL,
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];
397 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
403 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
409 mm_segment_t old_fs = get_fs();
412 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
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];
421 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
428 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
432 mm_segment_t old_fs = get_fs();
434 if (copy_siginfo_from_user32(&info, uinfo))
437 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
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.
446 asmlinkage long sys32_execve(void)
448 struct pt_regs *regs = task_pt_regs(current);
450 unsigned long result;
453 filename = getname(compat_ptr(regs->orig_gpr2));
454 if (IS_ERR(filename)) {
455 result = PTR_ERR(filename);
458 rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
459 compat_ptr(regs->gprs[4]), regs);
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];
477 #ifdef CONFIG_MODULES
480 sys32_init_module(void __user *umod, unsigned long len,
481 const char __user *uargs)
483 return sys_init_module(umod, len, uargs);
487 sys32_delete_module(const char __user *name_user, unsigned int flags)
489 return sys_delete_module(name_user, flags);
492 #else /* CONFIG_MODULES */
495 sys32_init_module(void __user *umod, unsigned long len,
496 const char __user *uargs)
502 sys32_delete_module(const char __user *name_user, unsigned int flags)
507 #endif /* CONFIG_MODULES */
509 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
510 size_t count, u32 poshi, u32 poslo)
512 if ((compat_ssize_t) count < 0)
514 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
517 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
518 size_t count, u32 poshi, u32 poslo)
520 if ((compat_ssize_t) count < 0)
522 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
525 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
527 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
530 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
532 mm_segment_t old_fs = get_fs();
536 if (offset && get_user(of, offset))
540 ret = sys_sendfile(out_fd, in_fd,
541 offset ? (off_t __force __user *) &of : NULL, count);
544 if (offset && put_user(of, offset))
550 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
551 compat_loff_t __user *offset, s32 count)
553 mm_segment_t old_fs = get_fs();
557 if (offset && get_user(lof, offset))
561 ret = sys_sendfile64(out_fd, in_fd,
562 offset ? (loff_t __force __user *) &lof : NULL,
566 if (offset && put_user(lof, offset))
572 #ifdef CONFIG_SYSCTL_SYSCALL
573 struct __sysctl_args32 {
583 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
585 struct __sysctl_args32 tmp;
588 size_t __user *oldlenp = NULL;
589 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
591 if (copy_from_user(&tmp, args, sizeof(tmp)))
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
601 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
602 put_user(oldlen, (size_t __user *)addr))
604 oldlenp = (size_t __user *)addr;
608 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
609 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
613 if (get_user(oldlen, (size_t __user *)addr) ||
614 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
617 if (copy_to_user(args->__unused, tmp.__unused,
618 sizeof(tmp.__unused)))
625 struct stat64_emu31 {
626 unsigned long long st_dev;
628 #define STAT64_HAS_BROKEN_ST_INO 1
630 unsigned int st_mode;
631 unsigned int st_nlink;
634 unsigned long long st_rdev;
638 unsigned char __pad4[4];
639 u32 __pad5; /* future possible st_blocks high bits */
640 u32 st_blocks; /* Number 512-byte blocks allocated. */
646 u32 __pad8; /* will be high 32 bits of ctime someday */
647 unsigned long st_ino;
650 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
652 struct stat64_emu31 tmp;
654 memset(&tmp, 0, sizeof(tmp));
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;
671 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
674 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
677 int ret = vfs_stat(filename, &stat);
679 ret = cp_stat64(statbuf, &stat);
683 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
686 int ret = vfs_lstat(filename, &stat);
688 ret = cp_stat64(statbuf, &stat);
692 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
695 int ret = vfs_fstat(fd, &stat);
697 ret = cp_stat64(statbuf, &stat);
701 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
702 struct stat64_emu31 __user* statbuf, int flag)
707 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
710 if (flag & AT_SYMLINK_NOFOLLOW)
711 error = vfs_lstat_fd(dfd, filename, &stat);
713 error = vfs_stat_fd(dfd, filename, &stat);
716 error = cp_stat64(statbuf, &stat);
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..
727 struct mmap_arg_struct_emu31 {
736 /* common code for old and new mmaps */
737 static 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)
742 struct file * file = NULL;
743 unsigned long error = -EBADF;
745 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
746 if (!(flags & MAP_ANONYMOUS)) {
752 down_write(¤t->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);
759 up_write(¤t->mm->mmap_sem);
768 asmlinkage unsigned long
769 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
771 struct mmap_arg_struct_emu31 a;
774 if (copy_from_user(&a, arg, sizeof(a)))
778 if (a.offset & ~PAGE_MASK)
781 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
787 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
789 struct mmap_arg_struct_emu31 a;
792 if (copy_from_user(&a, arg, sizeof(a)))
794 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
799 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
801 if ((compat_ssize_t) count < 0)
804 return sys_read(fd, buf, count);
807 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
809 if ((compat_ssize_t) count < 0)
812 return sys_write(fd, buf, count);
815 asmlinkage long sys32_clone(void)
817 struct pt_regs *regs = task_pt_regs(current);
818 unsigned long clone_flags;
820 int __user *parent_tidptr, *child_tidptr;
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]);
827 newsp = regs->gprs[15];
828 return do_fork(clone_flags, newsp, regs, 0,
829 parent_tidptr, child_tidptr);
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.
839 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
842 advise = POSIX_FADV_DONTNEED;
843 else if (advise == 5)
844 advise = POSIX_FADV_NOREUSE;
845 return sys_fadvise64(fd, offset, len, advise);
848 struct fadvise64_64_args {
856 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
858 struct fadvise64_64_args a;
860 if ( copy_from_user(&a, args, sizeof(a)) )
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);