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[S390] smp: introduce LC_ORDER and simplify lowcore handling
[linux-2.6/x86.git] / arch / s390 / kernel / compat_linux.c
blob5519cb7451065595baddd0ef027ef6e5e1f64305
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
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 |
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
106 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
107 {
108 return sys_chown(filename, low2highuid(user), low2highgid(group));
109 }
110
111 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
112 {
113 return sys_lchown(filename, low2highuid(user), low2highgid(group));
114 }
115
116 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
117 {
118 return sys_fchown(fd, low2highuid(user), low2highgid(group));
119 }
120
121 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
122 {
123 return sys_setregid(low2highgid(rgid), low2highgid(egid));
124 }
125
126 asmlinkage long sys32_setgid16(u16 gid)
127 {
128 return sys_setgid((gid_t)gid);
129 }
130
131 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
132 {
133 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
134 }
135
136 asmlinkage long sys32_setuid16(u16 uid)
137 {
138 return sys_setuid((uid_t)uid);
139 }
140
141 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
142 {
143 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
144 low2highuid(suid));
145 }
146
147 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
148 {
149 int retval;
150
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);
154
155 return retval;
156 }
157
158 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
159 {
160 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
161 low2highgid(sgid));
162 }
163
164 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
165 {
166 int retval;
167
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);
171
172 return retval;
173 }
174
175 asmlinkage long sys32_setfsuid16(u16 uid)
176 {
177 return sys_setfsuid((uid_t)uid);
178 }
179
180 asmlinkage long sys32_setfsgid16(u16 gid)
181 {
182 return sys_setfsgid((gid_t)gid);
183 }
184
185 static 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
199 static 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
213 asmlinkage 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->cred->group_info);
221 i = current->cred->group_info->ngroups;
222 if (gidsetsize) {
223 if (i > gidsetsize) {
224 i = -EINVAL;
225 goto out;
226 }
227 if (groups16_to_user(grouplist, current->cred->group_info)) {
228 i = -EFAULT;
229 goto out;
230 }
231 }
232 out:
233 put_group_info(current->cred->group_info);
234 return i;
235 }
236
237 asmlinkage 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
262 asmlinkage long sys32_getuid16(void)
263 {
264 return high2lowuid(current->cred->uid);
265 }
266
267 asmlinkage long sys32_geteuid16(void)
268 {
269 return high2lowuid(current->cred->euid);
270 }
271
272 asmlinkage long sys32_getgid16(void)
273 {
274 return high2lowgid(current->cred->gid);
275 }
276
277 asmlinkage long sys32_getegid16(void)
278 {
279 return high2lowgid(current->cred->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
288 asmlinkage 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
333 asmlinkage 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
341 asmlinkage 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
349 asmlinkage 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
365 asmlinkage 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
403 asmlinkage 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
427 asmlinkage long
428 sys32_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 */
446 asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
447 compat_uptr_t __user *envp)
448 {
449 struct pt_regs *regs = task_pt_regs(current);
450 char *filename;
451 long rc;
452
453 filename = getname(name);
454 rc = PTR_ERR(filename);
455 if (IS_ERR(filename))
456 return rc;
457 rc = compat_do_execve(filename, argv, envp, regs);
458 if (rc)
459 goto out;
460 current->thread.fp_regs.fpc=0;
461 asm volatile("sfpc %0,0" : : "d" (0));
462 rc = regs->gprs[2];
463 out:
464 putname(filename);
465 return rc;
466 }
467
468 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
469 size_t count, u32 poshi, u32 poslo)
470 {
471 if ((compat_ssize_t) count < 0)
472 return -EINVAL;
473 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
474 }
475
476 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
477 size_t count, u32 poshi, u32 poslo)
478 {
479 if ((compat_ssize_t) count < 0)
480 return -EINVAL;
481 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
482 }
483
484 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
485 {
486 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
487 }
488
489 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
490 {
491 mm_segment_t old_fs = get_fs();
492 int ret;
493 off_t of;
494
495 if (offset && get_user(of, offset))
496 return -EFAULT;
497
498 set_fs(KERNEL_DS);
499 ret = sys_sendfile(out_fd, in_fd,
500 offset ? (off_t __force __user *) &of : NULL, count);
501 set_fs(old_fs);
502
503 if (offset && put_user(of, offset))
504 return -EFAULT;
505
506 return ret;
507 }
508
509 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
510 compat_loff_t __user *offset, s32 count)
511 {
512 mm_segment_t old_fs = get_fs();
513 int ret;
514 loff_t lof;
515
516 if (offset && get_user(lof, offset))
517 return -EFAULT;
518
519 set_fs(KERNEL_DS);
520 ret = sys_sendfile64(out_fd, in_fd,
521 offset ? (loff_t __force __user *) &lof : NULL,
522 count);
523 set_fs(old_fs);
524
525 if (offset && put_user(lof, offset))
526 return -EFAULT;
527
528 return ret;
529 }
530
531 #ifdef CONFIG_SYSCTL_SYSCALL
532 struct __sysctl_args32 {
533 u32 name;
534 int nlen;
535 u32 oldval;
536 u32 oldlenp;
537 u32 newval;
538 u32 newlen;
539 u32 __unused[4];
540 };
541
542 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
543 {
544 struct __sysctl_args32 tmp;
545 int error;
546 size_t oldlen;
547 size_t __user *oldlenp = NULL;
548 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
549
550 if (copy_from_user(&tmp, args, sizeof(tmp)))
551 return -EFAULT;
552
553 if (tmp.oldval && tmp.oldlenp) {
554 /* Duh, this is ugly and might not work if sysctl_args
555 is in read-only memory, but do_sysctl does indirectly
556 a lot of uaccess in both directions and we'd have to
557 basically copy the whole sysctl.c here, and
558 glibc's __sysctl uses rw memory for the structure
559 anyway. */
560 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
561 put_user(oldlen, (size_t __user *)addr))
562 return -EFAULT;
563 oldlenp = (size_t __user *)addr;
564 }
565
566 lock_kernel();
567 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
568 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
569 unlock_kernel();
570 if (oldlenp) {
571 if (!error) {
572 if (get_user(oldlen, (size_t __user *)addr) ||
573 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
574 error = -EFAULT;
575 }
576 if (copy_to_user(args->__unused, tmp.__unused,
577 sizeof(tmp.__unused)))
578 error = -EFAULT;
579 }
580 return error;
581 }
582 #endif
583
584 struct stat64_emu31 {
585 unsigned long long st_dev;
586 unsigned int __pad1;
587 #define STAT64_HAS_BROKEN_ST_INO 1
588 u32 __st_ino;
589 unsigned int st_mode;
590 unsigned int st_nlink;
591 u32 st_uid;
592 u32 st_gid;
593 unsigned long long st_rdev;
594 unsigned int __pad3;
595 long st_size;
596 u32 st_blksize;
597 unsigned char __pad4[4];
598 u32 __pad5; /* future possible st_blocks high bits */
599 u32 st_blocks; /* Number 512-byte blocks allocated. */
600 u32 st_atime;
601 u32 __pad6;
602 u32 st_mtime;
603 u32 __pad7;
604 u32 st_ctime;
605 u32 __pad8; /* will be high 32 bits of ctime someday */
606 unsigned long st_ino;
607 };
608
609 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
610 {
611 struct stat64_emu31 tmp;
612
613 memset(&tmp, 0, sizeof(tmp));
614
615 tmp.st_dev = huge_encode_dev(stat->dev);
616 tmp.st_ino = stat->ino;
617 tmp.__st_ino = (u32)stat->ino;
618 tmp.st_mode = stat->mode;
619 tmp.st_nlink = (unsigned int)stat->nlink;
620 tmp.st_uid = stat->uid;
621 tmp.st_gid = stat->gid;
622 tmp.st_rdev = huge_encode_dev(stat->rdev);
623 tmp.st_size = stat->size;
624 tmp.st_blksize = (u32)stat->blksize;
625 tmp.st_blocks = (u32)stat->blocks;
626 tmp.st_atime = (u32)stat->atime.tv_sec;
627 tmp.st_mtime = (u32)stat->mtime.tv_sec;
628 tmp.st_ctime = (u32)stat->ctime.tv_sec;
629
630 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
631 }
632
633 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
634 {
635 struct kstat stat;
636 int ret = vfs_stat(filename, &stat);
637 if (!ret)
638 ret = cp_stat64(statbuf, &stat);
639 return ret;
640 }
641
642 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
643 {
644 struct kstat stat;
645 int ret = vfs_lstat(filename, &stat);
646 if (!ret)
647 ret = cp_stat64(statbuf, &stat);
648 return ret;
649 }
650
651 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
652 {
653 struct kstat stat;
654 int ret = vfs_fstat(fd, &stat);
655 if (!ret)
656 ret = cp_stat64(statbuf, &stat);
657 return ret;
658 }
659
660 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
661 struct stat64_emu31 __user* statbuf, int flag)
662 {
663 struct kstat stat;
664 int error;
665
666 error = vfs_fstatat(dfd, filename, &stat, flag);
667 if (error)
668 return error;
669 return cp_stat64(statbuf, &stat);
670 }
671
672 /*
673 * Linux/i386 didn't use to be able to handle more than
674 * 4 system call parameters, so these system calls used a memory
675 * block for parameter passing..
676 */
677
678 struct mmap_arg_struct_emu31 {
679 u32 addr;
680 u32 len;
681 u32 prot;
682 u32 flags;
683 u32 fd;
684 u32 offset;
685 };
686
687 /* common code for old and new mmaps */
688 static inline long do_mmap2(
689 unsigned long addr, unsigned long len,
690 unsigned long prot, unsigned long flags,
691 unsigned long fd, unsigned long pgoff)
692 {
693 struct file * file = NULL;
694 unsigned long error = -EBADF;
695
696 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
697 if (!(flags & MAP_ANONYMOUS)) {
698 file = fget(fd);
699 if (!file)
700 goto out;
701 }
702
703 down_write(&current->mm->mmap_sem);
704 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
705 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
706 /* Result is out of bounds. */
707 do_munmap(current->mm, addr, len);
708 error = -ENOMEM;
709 }
710 up_write(&current->mm->mmap_sem);
711
712 if (file)
713 fput(file);
714 out:
715 return error;
716 }
717
718
719 asmlinkage unsigned long
720 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
721 {
722 struct mmap_arg_struct_emu31 a;
723 int error = -EFAULT;
724
725 if (copy_from_user(&a, arg, sizeof(a)))
726 goto out;
727
728 error = -EINVAL;
729 if (a.offset & ~PAGE_MASK)
730 goto out;
731
732 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
733 out:
734 return error;
735 }
736
737 asmlinkage long
738 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
739 {
740 struct mmap_arg_struct_emu31 a;
741 int error = -EFAULT;
742
743 if (copy_from_user(&a, arg, sizeof(a)))
744 goto out;
745 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
746 out:
747 return error;
748 }
749
750 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
751 {
752 if ((compat_ssize_t) count < 0)
753 return -EINVAL;
754
755 return sys_read(fd, buf, count);
756 }
757
758 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
759 {
760 if ((compat_ssize_t) count < 0)
761 return -EINVAL;
762
763 return sys_write(fd, buf, count);
764 }
765
766 /*
767 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
768 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
769 * because the 31 bit values differ from the 64 bit values.
770 */
771
772 asmlinkage long
773 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
774 {
775 if (advise == 4)
776 advise = POSIX_FADV_DONTNEED;
777 else if (advise == 5)
778 advise = POSIX_FADV_NOREUSE;
779 return sys_fadvise64(fd, offset, len, advise);
780 }
781
782 struct fadvise64_64_args {
783 int fd;
784 long long offset;
785 long long len;
786 int advice;
787 };
788
789 asmlinkage long
790 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
791 {
792 struct fadvise64_64_args a;
793
794 if ( copy_from_user(&a, args, sizeof(a)) )
795 return -EFAULT;
796 if (a.advice == 4)
797 a.advice = POSIX_FADV_DONTNEED;
798 else if (a.advice == 5)
799 a.advice = POSIX_FADV_NOREUSE;
800 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
801 }
x86 "subsystem" repository