xref: /openbmc/linux/arch/powerpc/kernel/sys_ppc32.c (revision 22246614)
1 /*
2  * sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
3  *
4  * Copyright (C) 2001 IBM
5  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
7  *
8  * These routines maintain argument size conversion between 32bit and 64bit
9  * environment.
10  *
11  *      This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16 
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/fs.h>
20 #include <linux/mm.h>
21 #include <linux/file.h>
22 #include <linux/signal.h>
23 #include <linux/resource.h>
24 #include <linux/times.h>
25 #include <linux/utsname.h>
26 #include <linux/smp.h>
27 #include <linux/smp_lock.h>
28 #include <linux/sem.h>
29 #include <linux/msg.h>
30 #include <linux/shm.h>
31 #include <linux/poll.h>
32 #include <linux/personality.h>
33 #include <linux/stat.h>
34 #include <linux/mman.h>
35 #include <linux/in.h>
36 #include <linux/syscalls.h>
37 #include <linux/unistd.h>
38 #include <linux/sysctl.h>
39 #include <linux/binfmts.h>
40 #include <linux/security.h>
41 #include <linux/compat.h>
42 #include <linux/ptrace.h>
43 #include <linux/elf.h>
44 #include <linux/ipc.h>
45 
46 #include <asm/ptrace.h>
47 #include <asm/types.h>
48 #include <asm/uaccess.h>
49 #include <asm/unistd.h>
50 #include <asm/time.h>
51 #include <asm/mmu_context.h>
52 #include <asm/ppc-pci.h>
53 #include <asm/syscalls.h>
54 
55 struct old_linux_dirent32 {
56 	u32		d_ino;
57 	u32		d_offset;
58 	unsigned short	d_namlen;
59 	char		d_name[1];
60 };
61 
62 struct readdir_callback32 {
63 	struct old_linux_dirent32 __user * dirent;
64 	int count;
65 };
66 
67 static int fillonedir(void * __buf, const char * name, int namlen,
68 		                  off_t offset, u64 ino, unsigned int d_type)
69 {
70 	struct readdir_callback32 * buf = (struct readdir_callback32 *) __buf;
71 	struct old_linux_dirent32 __user * dirent;
72 	ino_t d_ino;
73 
74 	if (buf->count)
75 		return -EINVAL;
76 	d_ino = ino;
77 	if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
78 		return -EOVERFLOW;
79 	buf->count++;
80 	dirent = buf->dirent;
81 	put_user(d_ino, &dirent->d_ino);
82 	put_user(offset, &dirent->d_offset);
83 	put_user(namlen, &dirent->d_namlen);
84 	copy_to_user(dirent->d_name, name, namlen);
85 	put_user(0, dirent->d_name + namlen);
86 	return 0;
87 }
88 
89 asmlinkage int old32_readdir(unsigned int fd, struct old_linux_dirent32 __user *dirent, unsigned int count)
90 {
91 	int error = -EBADF;
92 	struct file * file;
93 	struct readdir_callback32 buf;
94 
95 	file = fget(fd);
96 	if (!file)
97 		goto out;
98 
99 	buf.count = 0;
100 	buf.dirent = dirent;
101 
102 	error = vfs_readdir(file, (filldir_t)fillonedir, &buf);
103 	if (error < 0)
104 		goto out_putf;
105 	error = buf.count;
106 
107 out_putf:
108 	fput(file);
109 out:
110 	return error;
111 }
112 
113 asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
114 		compat_ulong_t __user *outp, compat_ulong_t __user *exp,
115 		compat_uptr_t tvp_x)
116 {
117 	/* sign extend n */
118 	return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
119 }
120 
121 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
122 {
123 	compat_ino_t ino;
124 	long err;
125 
126 	if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
127 	    !new_valid_dev(stat->rdev))
128 		return -EOVERFLOW;
129 
130 	ino = stat->ino;
131 	if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
132 		return -EOVERFLOW;
133 
134 	err  = access_ok(VERIFY_WRITE, statbuf, sizeof(*statbuf)) ? 0 : -EFAULT;
135 	err |= __put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
136 	err |= __put_user(ino, &statbuf->st_ino);
137 	err |= __put_user(stat->mode, &statbuf->st_mode);
138 	err |= __put_user(stat->nlink, &statbuf->st_nlink);
139 	err |= __put_user(stat->uid, &statbuf->st_uid);
140 	err |= __put_user(stat->gid, &statbuf->st_gid);
141 	err |= __put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
142 	err |= __put_user(stat->size, &statbuf->st_size);
143 	err |= __put_user(stat->atime.tv_sec, &statbuf->st_atime);
144 	err |= __put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
145 	err |= __put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
146 	err |= __put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
147 	err |= __put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
148 	err |= __put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
149 	err |= __put_user(stat->blksize, &statbuf->st_blksize);
150 	err |= __put_user(stat->blocks, &statbuf->st_blocks);
151 	err |= __put_user(0, &statbuf->__unused4[0]);
152 	err |= __put_user(0, &statbuf->__unused4[1]);
153 
154 	return err;
155 }
156 
157 /* Note: it is necessary to treat option as an unsigned int,
158  * with the corresponding cast to a signed int to insure that the
159  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
160  * and the register representation of a signed int (msr in 64-bit mode) is performed.
161  */
162 asmlinkage long compat_sys_sysfs(u32 option, u32 arg1, u32 arg2)
163 {
164 	return sys_sysfs((int)option, arg1, arg2);
165 }
166 
167 asmlinkage long compat_sys_pause(void)
168 {
169 	current->state = TASK_INTERRUPTIBLE;
170 	schedule();
171 
172 	return -ERESTARTNOHAND;
173 }
174 
175 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
176 {
177 	long usec;
178 
179 	if (!access_ok(VERIFY_READ, i, sizeof(*i)))
180 		return -EFAULT;
181 	if (__get_user(o->tv_sec, &i->tv_sec))
182 		return -EFAULT;
183 	if (__get_user(usec, &i->tv_usec))
184 		return -EFAULT;
185 	o->tv_nsec = usec * 1000;
186 	return 0;
187 }
188 
189 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
190 {
191 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
192 		(__put_user(i->tv_sec, &o->tv_sec) |
193 		 __put_user(i->tv_usec, &o->tv_usec)));
194 }
195 
196 
197 
198 
199 /* Translations due to time_t size differences.  Which affects all
200    sorts of things, like timeval and itimerval.  */
201 extern struct timezone sys_tz;
202 
203 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
204 {
205 	if (tv) {
206 		struct timeval ktv;
207 		do_gettimeofday(&ktv);
208 		if (put_tv32(tv, &ktv))
209 			return -EFAULT;
210 	}
211 	if (tz) {
212 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
213 			return -EFAULT;
214 	}
215 
216 	return 0;
217 }
218 
219 
220 
221 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
222 {
223 	struct timespec kts;
224 	struct timezone ktz;
225 
226  	if (tv) {
227 		if (get_ts32(&kts, tv))
228 			return -EFAULT;
229 	}
230 	if (tz) {
231 		if (copy_from_user(&ktz, tz, sizeof(ktz)))
232 			return -EFAULT;
233 	}
234 
235 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
236 }
237 
238 #ifdef CONFIG_SYSVIPC
239 long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr,
240 	       u32 fifth)
241 {
242 	int version;
243 
244 	version = call >> 16; /* hack for backward compatibility */
245 	call &= 0xffff;
246 
247 	switch (call) {
248 
249 	case SEMTIMEDOP:
250 		if (fifth)
251 			/* sign extend semid */
252 			return compat_sys_semtimedop((int)first,
253 						     compat_ptr(ptr), second,
254 						     compat_ptr(fifth));
255 		/* else fall through for normal semop() */
256 	case SEMOP:
257 		/* struct sembuf is the same on 32 and 64bit :)) */
258 		/* sign extend semid */
259 		return sys_semtimedop((int)first, compat_ptr(ptr), second,
260 				      NULL);
261 	case SEMGET:
262 		/* sign extend key, nsems */
263 		return sys_semget((int)first, (int)second, third);
264 	case SEMCTL:
265 		/* sign extend semid, semnum */
266 		return compat_sys_semctl((int)first, (int)second, third,
267 					 compat_ptr(ptr));
268 
269 	case MSGSND:
270 		/* sign extend msqid */
271 		return compat_sys_msgsnd((int)first, (int)second, third,
272 					 compat_ptr(ptr));
273 	case MSGRCV:
274 		/* sign extend msqid, msgtyp */
275 		return compat_sys_msgrcv((int)first, second, (int)fifth,
276 					 third, version, compat_ptr(ptr));
277 	case MSGGET:
278 		/* sign extend key */
279 		return sys_msgget((int)first, second);
280 	case MSGCTL:
281 		/* sign extend msqid */
282 		return compat_sys_msgctl((int)first, second, compat_ptr(ptr));
283 
284 	case SHMAT:
285 		/* sign extend shmid */
286 		return compat_sys_shmat((int)first, second, third, version,
287 					compat_ptr(ptr));
288 	case SHMDT:
289 		return sys_shmdt(compat_ptr(ptr));
290 	case SHMGET:
291 		/* sign extend key_t */
292 		return sys_shmget((int)first, second, third);
293 	case SHMCTL:
294 		/* sign extend shmid */
295 		return compat_sys_shmctl((int)first, second, compat_ptr(ptr));
296 
297 	default:
298 		return -ENOSYS;
299 	}
300 
301 	return -ENOSYS;
302 }
303 #endif
304 
305 /* Note: it is necessary to treat out_fd and in_fd as unsigned ints,
306  * with the corresponding cast to a signed int to insure that the
307  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
308  * and the register representation of a signed int (msr in 64-bit mode) is performed.
309  */
310 asmlinkage long compat_sys_sendfile(u32 out_fd, u32 in_fd, compat_off_t __user * offset, u32 count)
311 {
312 	mm_segment_t old_fs = get_fs();
313 	int ret;
314 	off_t of;
315 	off_t __user *up;
316 
317 	if (offset && get_user(of, offset))
318 		return -EFAULT;
319 
320 	/* The __user pointer cast is valid because of the set_fs() */
321 	set_fs(KERNEL_DS);
322 	up = offset ? (off_t __user *) &of : NULL;
323 	ret = sys_sendfile((int)out_fd, (int)in_fd, up, count);
324 	set_fs(old_fs);
325 
326 	if (offset && put_user(of, offset))
327 		return -EFAULT;
328 
329 	return ret;
330 }
331 
332 asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
333 {
334 	mm_segment_t old_fs = get_fs();
335 	int ret;
336 	loff_t lof;
337 	loff_t __user *up;
338 
339 	if (offset && get_user(lof, offset))
340 		return -EFAULT;
341 
342 	/* The __user pointer cast is valid because of the set_fs() */
343 	set_fs(KERNEL_DS);
344 	up = offset ? (loff_t __user *) &lof : NULL;
345 	ret = sys_sendfile64(out_fd, in_fd, up, count);
346 	set_fs(old_fs);
347 
348 	if (offset && put_user(lof, offset))
349 		return -EFAULT;
350 
351 	return ret;
352 }
353 
354 long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
355 		  unsigned long a3, unsigned long a4, unsigned long a5,
356 		  struct pt_regs *regs)
357 {
358 	int error;
359 	char * filename;
360 
361 	filename = getname((char __user *) a0);
362 	error = PTR_ERR(filename);
363 	if (IS_ERR(filename))
364 		goto out;
365 	flush_fp_to_thread(current);
366 	flush_altivec_to_thread(current);
367 
368 	error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
369 
370 	putname(filename);
371 
372 out:
373 	return error;
374 }
375 
376 /* Note: it is necessary to treat option as an unsigned int,
377  * with the corresponding cast to a signed int to insure that the
378  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
379  * and the register representation of a signed int (msr in 64-bit mode) is performed.
380  */
381 asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 arg5)
382 {
383 	return sys_prctl((int)option,
384 			 (unsigned long) arg2,
385 			 (unsigned long) arg3,
386 			 (unsigned long) arg4,
387 			 (unsigned long) arg5);
388 }
389 
390 /* Note: it is necessary to treat pid as an unsigned int,
391  * with the corresponding cast to a signed int to insure that the
392  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
393  * and the register representation of a signed int (msr in 64-bit mode) is performed.
394  */
395 asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
396 {
397 	struct timespec t;
398 	int ret;
399 	mm_segment_t old_fs = get_fs ();
400 
401 	/* The __user pointer cast is valid because of the set_fs() */
402 	set_fs (KERNEL_DS);
403 	ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
404 	set_fs (old_fs);
405 	if (put_compat_timespec(&t, interval))
406 		return -EFAULT;
407 	return ret;
408 }
409 
410 /* Note: it is necessary to treat mode as an unsigned int,
411  * with the corresponding cast to a signed int to insure that the
412  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
413  * and the register representation of a signed int (msr in 64-bit mode) is performed.
414  */
415 asmlinkage long compat_sys_access(const char __user * filename, u32 mode)
416 {
417 	return sys_access(filename, (int)mode);
418 }
419 
420 
421 /* Note: it is necessary to treat mode as an unsigned int,
422  * with the corresponding cast to a signed int to insure that the
423  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
424  * and the register representation of a signed int (msr in 64-bit mode) is performed.
425  */
426 asmlinkage long compat_sys_creat(const char __user * pathname, u32 mode)
427 {
428 	return sys_creat(pathname, (int)mode);
429 }
430 
431 
432 /* Note: it is necessary to treat pid and options as unsigned ints,
433  * with the corresponding cast to a signed int to insure that the
434  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
435  * and the register representation of a signed int (msr in 64-bit mode) is performed.
436  */
437 asmlinkage long compat_sys_waitpid(u32 pid, unsigned int __user * stat_addr, u32 options)
438 {
439 	return sys_waitpid((int)pid, stat_addr, (int)options);
440 }
441 
442 
443 /* Note: it is necessary to treat gidsetsize as an unsigned int,
444  * with the corresponding cast to a signed int to insure that the
445  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
446  * and the register representation of a signed int (msr in 64-bit mode) is performed.
447  */
448 asmlinkage long compat_sys_getgroups(u32 gidsetsize, gid_t __user *grouplist)
449 {
450 	return sys_getgroups((int)gidsetsize, grouplist);
451 }
452 
453 
454 /* Note: it is necessary to treat pid as an unsigned int,
455  * with the corresponding cast to a signed int to insure that the
456  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
457  * and the register representation of a signed int (msr in 64-bit mode) is performed.
458  */
459 asmlinkage long compat_sys_getpgid(u32 pid)
460 {
461 	return sys_getpgid((int)pid);
462 }
463 
464 
465 
466 /* Note: it is necessary to treat pid as an unsigned int,
467  * with the corresponding cast to a signed int to insure that the
468  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
469  * and the register representation of a signed int (msr in 64-bit mode) is performed.
470  */
471 asmlinkage long compat_sys_getsid(u32 pid)
472 {
473 	return sys_getsid((int)pid);
474 }
475 
476 
477 /* Note: it is necessary to treat pid and sig as unsigned ints,
478  * with the corresponding cast to a signed int to insure that the
479  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
480  * and the register representation of a signed int (msr in 64-bit mode) is performed.
481  */
482 asmlinkage long compat_sys_kill(u32 pid, u32 sig)
483 {
484 	return sys_kill((int)pid, (int)sig);
485 }
486 
487 
488 /* Note: it is necessary to treat mode as an unsigned int,
489  * with the corresponding cast to a signed int to insure that the
490  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
491  * and the register representation of a signed int (msr in 64-bit mode) is performed.
492  */
493 asmlinkage long compat_sys_mkdir(const char __user * pathname, u32 mode)
494 {
495 	return sys_mkdir(pathname, (int)mode);
496 }
497 
498 long compat_sys_nice(u32 increment)
499 {
500 	/* sign extend increment */
501 	return sys_nice((int)increment);
502 }
503 
504 off_t ppc32_lseek(unsigned int fd, u32 offset, unsigned int origin)
505 {
506 	/* sign extend n */
507 	return sys_lseek(fd, (int)offset, origin);
508 }
509 
510 /* Note: it is necessary to treat bufsiz as an unsigned int,
511  * with the corresponding cast to a signed int to insure that the
512  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
513  * and the register representation of a signed int (msr in 64-bit mode) is performed.
514  */
515 asmlinkage long compat_sys_readlink(const char __user * path, char __user * buf, u32 bufsiz)
516 {
517 	return sys_readlink(path, buf, (int)bufsiz);
518 }
519 
520 /* Note: it is necessary to treat option as an unsigned int,
521  * with the corresponding cast to a signed int to insure that the
522  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
523  * and the register representation of a signed int (msr in 64-bit mode) is performed.
524  */
525 asmlinkage long compat_sys_sched_get_priority_max(u32 policy)
526 {
527 	return sys_sched_get_priority_max((int)policy);
528 }
529 
530 
531 /* Note: it is necessary to treat policy as an unsigned int,
532  * with the corresponding cast to a signed int to insure that the
533  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
534  * and the register representation of a signed int (msr in 64-bit mode) is performed.
535  */
536 asmlinkage long compat_sys_sched_get_priority_min(u32 policy)
537 {
538 	return sys_sched_get_priority_min((int)policy);
539 }
540 
541 
542 /* Note: it is necessary to treat pid as an unsigned int,
543  * with the corresponding cast to a signed int to insure that the
544  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
545  * and the register representation of a signed int (msr in 64-bit mode) is performed.
546  */
547 asmlinkage long compat_sys_sched_getparam(u32 pid, struct sched_param __user *param)
548 {
549 	return sys_sched_getparam((int)pid, param);
550 }
551 
552 
553 /* Note: it is necessary to treat pid as an unsigned int,
554  * with the corresponding cast to a signed int to insure that the
555  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
556  * and the register representation of a signed int (msr in 64-bit mode) is performed.
557  */
558 asmlinkage long compat_sys_sched_getscheduler(u32 pid)
559 {
560 	return sys_sched_getscheduler((int)pid);
561 }
562 
563 
564 /* Note: it is necessary to treat pid as an unsigned int,
565  * with the corresponding cast to a signed int to insure that the
566  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
567  * and the register representation of a signed int (msr in 64-bit mode) is performed.
568  */
569 asmlinkage long compat_sys_sched_setparam(u32 pid, struct sched_param __user *param)
570 {
571 	return sys_sched_setparam((int)pid, param);
572 }
573 
574 
575 /* Note: it is necessary to treat pid and policy as unsigned ints,
576  * with the corresponding cast to a signed int to insure that the
577  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
578  * and the register representation of a signed int (msr in 64-bit mode) is performed.
579  */
580 asmlinkage long compat_sys_sched_setscheduler(u32 pid, u32 policy, struct sched_param __user *param)
581 {
582 	return sys_sched_setscheduler((int)pid, (int)policy, param);
583 }
584 
585 
586 /* Note: it is necessary to treat len as an unsigned int,
587  * with the corresponding cast to a signed int to insure that the
588  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
589  * and the register representation of a signed int (msr in 64-bit mode) is performed.
590  */
591 asmlinkage long compat_sys_setdomainname(char __user *name, u32 len)
592 {
593 	return sys_setdomainname(name, (int)len);
594 }
595 
596 
597 /* Note: it is necessary to treat gidsetsize as an unsigned int,
598  * with the corresponding cast to a signed int to insure that the
599  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
600  * and the register representation of a signed int (msr in 64-bit mode) is performed.
601  */
602 asmlinkage long compat_sys_setgroups(u32 gidsetsize, gid_t __user *grouplist)
603 {
604 	return sys_setgroups((int)gidsetsize, grouplist);
605 }
606 
607 
608 asmlinkage long compat_sys_sethostname(char __user *name, u32 len)
609 {
610 	/* sign extend len */
611 	return sys_sethostname(name, (int)len);
612 }
613 
614 
615 /* Note: it is necessary to treat pid and pgid as unsigned ints,
616  * with the corresponding cast to a signed int to insure that the
617  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
618  * and the register representation of a signed int (msr in 64-bit mode) is performed.
619  */
620 asmlinkage long compat_sys_setpgid(u32 pid, u32 pgid)
621 {
622 	return sys_setpgid((int)pid, (int)pgid);
623 }
624 
625 long compat_sys_getpriority(u32 which, u32 who)
626 {
627 	/* sign extend which and who */
628 	return sys_getpriority((int)which, (int)who);
629 }
630 
631 long compat_sys_setpriority(u32 which, u32 who, u32 niceval)
632 {
633 	/* sign extend which, who and niceval */
634 	return sys_setpriority((int)which, (int)who, (int)niceval);
635 }
636 
637 long compat_sys_ioprio_get(u32 which, u32 who)
638 {
639 	/* sign extend which and who */
640 	return sys_ioprio_get((int)which, (int)who);
641 }
642 
643 long compat_sys_ioprio_set(u32 which, u32 who, u32 ioprio)
644 {
645 	/* sign extend which, who and ioprio */
646 	return sys_ioprio_set((int)which, (int)who, (int)ioprio);
647 }
648 
649 /* Note: it is necessary to treat newmask as an unsigned int,
650  * with the corresponding cast to a signed int to insure that the
651  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
652  * and the register representation of a signed int (msr in 64-bit mode) is performed.
653  */
654 asmlinkage long compat_sys_ssetmask(u32 newmask)
655 {
656 	return sys_ssetmask((int) newmask);
657 }
658 
659 asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
660 {
661 	/* sign extend len */
662 	return sys_syslog(type, buf, (int)len);
663 }
664 
665 
666 /* Note: it is necessary to treat mask as an unsigned int,
667  * with the corresponding cast to a signed int to insure that the
668  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
669  * and the register representation of a signed int (msr in 64-bit mode) is performed.
670  */
671 asmlinkage long compat_sys_umask(u32 mask)
672 {
673 	return sys_umask((int)mask);
674 }
675 
676 #ifdef CONFIG_SYSCTL_SYSCALL
677 struct __sysctl_args32 {
678 	u32 name;
679 	int nlen;
680 	u32 oldval;
681 	u32 oldlenp;
682 	u32 newval;
683 	u32 newlen;
684 	u32 __unused[4];
685 };
686 
687 asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
688 {
689 	struct __sysctl_args32 tmp;
690 	int error;
691 	size_t oldlen;
692 	size_t __user *oldlenp = NULL;
693 	unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
694 
695 	if (copy_from_user(&tmp, args, sizeof(tmp)))
696 		return -EFAULT;
697 
698 	if (tmp.oldval && tmp.oldlenp) {
699 		/* Duh, this is ugly and might not work if sysctl_args
700 		   is in read-only memory, but do_sysctl does indirectly
701 		   a lot of uaccess in both directions and we'd have to
702 		   basically copy the whole sysctl.c here, and
703 		   glibc's __sysctl uses rw memory for the structure
704 		   anyway.  */
705 		oldlenp = (size_t __user *)addr;
706 		if (get_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)) ||
707 		    put_user(oldlen, oldlenp))
708 			return -EFAULT;
709 	}
710 
711 	lock_kernel();
712 	error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
713 			  compat_ptr(tmp.oldval), oldlenp,
714 			  compat_ptr(tmp.newval), tmp.newlen);
715 	unlock_kernel();
716 	if (oldlenp) {
717 		if (!error) {
718 			if (get_user(oldlen, oldlenp) ||
719 			    put_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)))
720 				error = -EFAULT;
721 		}
722 		copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
723 	}
724 	return error;
725 }
726 #endif
727 
728 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
729 			  unsigned long prot, unsigned long flags,
730 			  unsigned long fd, unsigned long pgoff)
731 {
732 	/* This should remain 12 even if PAGE_SIZE changes */
733 	return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
734 }
735 
736 long compat_sys_tgkill(u32 tgid, u32 pid, int sig)
737 {
738 	/* sign extend tgid, pid */
739 	return sys_tgkill((int)tgid, (int)pid, sig);
740 }
741 
742 /*
743  * long long munging:
744  * The 32 bit ABI passes long longs in an odd even register pair.
745  */
746 
747 compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
748 			     u32 reg6, u32 poshi, u32 poslo)
749 {
750 	return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
751 }
752 
753 compat_ssize_t compat_sys_pwrite64(unsigned int fd, char __user *ubuf, compat_size_t count,
754 			      u32 reg6, u32 poshi, u32 poslo)
755 {
756 	return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
757 }
758 
759 compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
760 {
761 	return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
762 }
763 
764 asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
765 				unsigned long high, unsigned long low)
766 {
767 	return sys_truncate(path, (high << 32) | low);
768 }
769 
770 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
771 				     u32 lenhi, u32 lenlo)
772 {
773 	return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
774 			     ((loff_t)lenhi << 32) | lenlo);
775 }
776 
777 asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
778 				 unsigned long low)
779 {
780 	return sys_ftruncate(fd, (high << 32) | low);
781 }
782 
783 long ppc32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
784 			  size_t len)
785 {
786 	return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
787 				  buf, len);
788 }
789 
790 long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
791 		     size_t len, int advice)
792 {
793 	return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, len,
794 			     advice);
795 }
796 
797 asmlinkage long compat_sys_add_key(const char __user *_type,
798 			      const char __user *_description,
799 			      const void __user *_payload,
800 			      u32 plen,
801 			      u32 ringid)
802 {
803 	return sys_add_key(_type, _description, _payload, plen, ringid);
804 }
805 
806 asmlinkage long compat_sys_request_key(const char __user *_type,
807 				  const char __user *_description,
808 				  const char __user *_callout_info,
809 				  u32 destringid)
810 {
811 	return sys_request_key(_type, _description, _callout_info, destringid);
812 }
813 
814 asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
815 				   unsigned offset_hi, unsigned offset_lo,
816 				   unsigned nbytes_hi, unsigned nbytes_lo)
817 {
818 	loff_t offset = ((loff_t)offset_hi << 32) | offset_lo;
819 	loff_t nbytes = ((loff_t)nbytes_hi << 32) | nbytes_lo;
820 
821 	return sys_sync_file_range(fd, offset, nbytes, flags);
822 }
823