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/smp.h>
28 #include <linux/smp_lock.h>
29 #include <linux/sem.h>
30 #include <linux/msg.h>
31 #include <linux/shm.h>
32 #include <linux/slab.h>
33 #include <linux/uio.h>
34 #include <linux/quota.h>
35 #include <linux/module.h>
36 #include <linux/poll.h>
37 #include <linux/personality.h>
38 #include <linux/stat.h>
39 #include <linux/filter.h>
40 #include <linux/highmem.h>
41 #include <linux/highuid.h>
42 #include <linux/mman.h>
43 #include <linux/ipv6.h>
45 #include <linux/icmpv6.h>
46 #include <linux/syscalls.h>
47 #include <linux/sysctl.h>
48 #include <linux/binfmts.h>
49 #include <linux/capability.h>
50 #include <linux/compat.h>
51 #include <linux/vfs.h>
52 #include <linux/ptrace.h>
53 #include <linux/fadvise.h>
54 #include <linux/ipc.h>
56 #include <asm/types.h>
57 #include <asm/uaccess.h>
62 #include "compat_linux.h"
64 long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
65 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
66 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
67 long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
68 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
71 /* For this source file, we want overflow handling. */
81 #undef SET_OLDSTAT_UID
82 #undef SET_OLDSTAT_GID
86 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
87 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
88 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
89 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
90 #define SET_UID16(var, uid) var = high2lowuid(uid)
91 #define SET_GID16(var, gid) var = high2lowgid(gid)
92 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
93 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
94 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
95 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
96 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
97 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
99 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
101 return sys_chown(filename, low2highuid(user), low2highgid(group));
104 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
106 return sys_lchown(filename, low2highuid(user), low2highgid(group));
109 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
111 return sys_fchown(fd, low2highuid(user), low2highgid(group));
114 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
116 return sys_setregid(low2highgid(rgid), low2highgid(egid));
119 asmlinkage long sys32_setgid16(u16 gid)
121 return sys_setgid((gid_t)gid);
124 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
126 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
129 asmlinkage long sys32_setuid16(u16 uid)
131 return sys_setuid((uid_t)uid);
134 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
136 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
140 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
144 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
145 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
146 retval = put_user(high2lowuid(current->cred->suid), suid);
151 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
153 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
157 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
161 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
162 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
163 retval = put_user(high2lowgid(current->cred->sgid), sgid);
168 asmlinkage long sys32_setfsuid16(u16 uid)
170 return sys_setfsuid((uid_t)uid);
173 asmlinkage long sys32_setfsgid16(u16 gid)
175 return sys_setfsgid((gid_t)gid);
178 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
183 for (i = 0; i < group_info->ngroups; i++) {
184 group = (u16)GROUP_AT(group_info, i);
185 if (put_user(group, grouplist+i))
192 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
197 for (i = 0; i < group_info->ngroups; i++) {
198 if (get_user(group, grouplist+i))
200 GROUP_AT(group_info, i) = (gid_t)group;
206 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
213 get_group_info(current->cred->group_info);
214 i = current->cred->group_info->ngroups;
216 if (i > gidsetsize) {
220 if (groups16_to_user(grouplist, current->cred->group_info)) {
226 put_group_info(current->cred->group_info);
230 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
232 struct group_info *group_info;
235 if (!capable(CAP_SETGID))
237 if ((unsigned)gidsetsize > NGROUPS_MAX)
240 group_info = groups_alloc(gidsetsize);
243 retval = groups16_from_user(group_info, grouplist);
245 put_group_info(group_info);
249 retval = set_current_groups(group_info);
250 put_group_info(group_info);
255 asmlinkage long sys32_getuid16(void)
257 return high2lowuid(current->cred->uid);
260 asmlinkage long sys32_geteuid16(void)
262 return high2lowuid(current->cred->euid);
265 asmlinkage long sys32_getgid16(void)
267 return high2lowgid(current->cred->gid);
270 asmlinkage long sys32_getegid16(void)
272 return high2lowgid(current->cred->egid);
276 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
278 * This is really horribly ugly.
280 #ifdef CONFIG_SYSVIPC
281 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
283 if (call >> 16) /* hack for backward compatibility */
290 return compat_sys_semtimedop(first, compat_ptr(ptr),
291 second, compat_ptr(third));
293 /* struct sembuf is the same on 32 and 64bit :)) */
294 return sys_semtimedop(first, compat_ptr(ptr),
297 return sys_semget(first, second, third);
299 return compat_sys_semctl(first, second, third,
302 return compat_sys_msgsnd(first, second, third,
305 return compat_sys_msgrcv(first, second, 0, third,
308 return sys_msgget((key_t) first, second);
310 return compat_sys_msgctl(first, second, compat_ptr(ptr));
312 return compat_sys_shmat(first, second, third,
315 return sys_shmdt(compat_ptr(ptr));
317 return sys_shmget(first, (unsigned)second, third);
319 return compat_sys_shmctl(first, second, compat_ptr(ptr));
326 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
331 return sys_truncate(path, (high << 32) | low);
334 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
339 return sys_ftruncate(fd, (high << 32) | low);
342 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
343 struct compat_timespec __user *interval)
347 mm_segment_t old_fs = get_fs ();
350 ret = sys_sched_rr_get_interval(pid,
351 (struct timespec __force __user *) &t);
353 if (put_compat_timespec(&t, interval))
358 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
359 compat_sigset_t __user *oset, size_t sigsetsize)
364 mm_segment_t old_fs = get_fs();
367 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
369 switch (_NSIG_WORDS) {
370 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
371 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
372 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
373 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
377 ret = sys_rt_sigprocmask(how,
378 set ? (sigset_t __force __user *) &s : NULL,
379 oset ? (sigset_t __force __user *) &s : NULL,
384 switch (_NSIG_WORDS) {
385 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
386 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
387 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
388 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
390 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
396 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
402 mm_segment_t old_fs = get_fs();
405 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
408 switch (_NSIG_WORDS) {
409 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
410 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
411 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
412 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
414 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
421 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
425 mm_segment_t old_fs = get_fs();
427 if (copy_siginfo_from_user32(&info, uinfo))
430 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
436 * sys32_execve() executes a new program after the asm stub has set
437 * things up for us. This should basically do what I want it to.
439 asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
440 compat_uptr_t __user *envp)
442 struct pt_regs *regs = task_pt_regs(current);
446 filename = getname(name);
447 rc = PTR_ERR(filename);
448 if (IS_ERR(filename))
450 rc = compat_do_execve(filename, argv, envp, regs);
453 current->thread.fp_regs.fpc=0;
454 asm volatile("sfpc %0,0" : : "d" (0));
461 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
462 size_t count, u32 poshi, u32 poslo)
464 if ((compat_ssize_t) count < 0)
466 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
469 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
470 size_t count, u32 poshi, u32 poslo)
472 if ((compat_ssize_t) count < 0)
474 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
477 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
479 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
482 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
484 mm_segment_t old_fs = get_fs();
488 if (offset && get_user(of, offset))
492 ret = sys_sendfile(out_fd, in_fd,
493 offset ? (off_t __force __user *) &of : NULL, count);
496 if (offset && put_user(of, offset))
502 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
503 compat_loff_t __user *offset, s32 count)
505 mm_segment_t old_fs = get_fs();
509 if (offset && get_user(lof, offset))
513 ret = sys_sendfile64(out_fd, in_fd,
514 offset ? (loff_t __force __user *) &lof : NULL,
518 if (offset && put_user(lof, offset))
524 struct stat64_emu31 {
525 unsigned long long st_dev;
527 #define STAT64_HAS_BROKEN_ST_INO 1
529 unsigned int st_mode;
530 unsigned int st_nlink;
533 unsigned long long st_rdev;
537 unsigned char __pad4[4];
538 u32 __pad5; /* future possible st_blocks high bits */
539 u32 st_blocks; /* Number 512-byte blocks allocated. */
545 u32 __pad8; /* will be high 32 bits of ctime someday */
546 unsigned long st_ino;
549 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
551 struct stat64_emu31 tmp;
553 memset(&tmp, 0, sizeof(tmp));
555 tmp.st_dev = huge_encode_dev(stat->dev);
556 tmp.st_ino = stat->ino;
557 tmp.__st_ino = (u32)stat->ino;
558 tmp.st_mode = stat->mode;
559 tmp.st_nlink = (unsigned int)stat->nlink;
560 tmp.st_uid = stat->uid;
561 tmp.st_gid = stat->gid;
562 tmp.st_rdev = huge_encode_dev(stat->rdev);
563 tmp.st_size = stat->size;
564 tmp.st_blksize = (u32)stat->blksize;
565 tmp.st_blocks = (u32)stat->blocks;
566 tmp.st_atime = (u32)stat->atime.tv_sec;
567 tmp.st_mtime = (u32)stat->mtime.tv_sec;
568 tmp.st_ctime = (u32)stat->ctime.tv_sec;
570 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
573 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
576 int ret = vfs_stat(filename, &stat);
578 ret = cp_stat64(statbuf, &stat);
582 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
585 int ret = vfs_lstat(filename, &stat);
587 ret = cp_stat64(statbuf, &stat);
591 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
594 int ret = vfs_fstat(fd, &stat);
596 ret = cp_stat64(statbuf, &stat);
600 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
601 struct stat64_emu31 __user* statbuf, int flag)
606 error = vfs_fstatat(dfd, filename, &stat, flag);
609 return cp_stat64(statbuf, &stat);
613 * Linux/i386 didn't use to be able to handle more than
614 * 4 system call parameters, so these system calls used a memory
615 * block for parameter passing..
618 struct mmap_arg_struct_emu31 {
627 /* common code for old and new mmaps */
628 static inline long do_mmap2(
629 unsigned long addr, unsigned long len,
630 unsigned long prot, unsigned long flags,
631 unsigned long fd, unsigned long pgoff)
633 struct file * file = NULL;
634 unsigned long error = -EBADF;
636 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
637 if (!(flags & MAP_ANONYMOUS)) {
643 down_write(¤t->mm->mmap_sem);
644 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
645 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
646 /* Result is out of bounds. */
647 do_munmap(current->mm, addr, len);
650 up_write(¤t->mm->mmap_sem);
659 asmlinkage unsigned long
660 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
662 struct mmap_arg_struct_emu31 a;
665 if (copy_from_user(&a, arg, sizeof(a)))
669 if (a.offset & ~PAGE_MASK)
672 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
678 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
680 struct mmap_arg_struct_emu31 a;
683 if (copy_from_user(&a, arg, sizeof(a)))
685 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
690 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
692 if ((compat_ssize_t) count < 0)
695 return sys_read(fd, buf, count);
698 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
700 if ((compat_ssize_t) count < 0)
703 return sys_write(fd, buf, count);
707 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
708 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
709 * because the 31 bit values differ from the 64 bit values.
713 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
716 advise = POSIX_FADV_DONTNEED;
717 else if (advise == 5)
718 advise = POSIX_FADV_NOREUSE;
719 return sys_fadvise64(fd, offset, len, advise);
722 struct fadvise64_64_args {
730 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
732 struct fadvise64_64_args a;
734 if ( copy_from_user(&a, args, sizeof(a)) )
737 a.advice = POSIX_FADV_DONTNEED;
738 else if (a.advice == 5)
739 a.advice = POSIX_FADV_NOREUSE;
740 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);