xref: /openbmc/linux/arch/parisc/kernel/sys_parisc32.c (revision 96de0e252cedffad61b3cb5e05662c591898e69a) 
1 /*
2  * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
3  *
4  * Copyright (C) 2000-2001 Hewlett Packard Company
5  * Copyright (C) 2000 John Marvin
6  * Copyright (C) 2001 Matthew Wilcox
7  *
8  * These routines maintain argument size conversion between 32bit and 64bit
9  * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
10  */
11 
12 #include <linux/compat.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/fs.h>
16 #include <linux/mm.h>
17 #include <linux/file.h>
18 #include <linux/signal.h>
19 #include <linux/resource.h>
20 #include <linux/times.h>
21 #include <linux/utsname.h>
22 #include <linux/time.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/sem.h>
26 #include <linux/msg.h>
27 #include <linux/shm.h>
28 #include <linux/slab.h>
29 #include <linux/uio.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/ncp_fs.h>
32 #include <linux/sunrpc/svc.h>
33 #include <linux/nfsd/nfsd.h>
34 #include <linux/nfsd/cache.h>
35 #include <linux/nfsd/xdr.h>
36 #include <linux/nfsd/syscall.h>
37 #include <linux/poll.h>
38 #include <linux/personality.h>
39 #include <linux/stat.h>
40 #include <linux/highmem.h>
41 #include <linux/highuid.h>
42 #include <linux/mman.h>
43 #include <linux/binfmts.h>
44 #include <linux/namei.h>
45 #include <linux/vfs.h>
46 #include <linux/ptrace.h>
47 #include <linux/swap.h>
48 #include <linux/syscalls.h>
49 
50 #include <asm/types.h>
51 #include <asm/uaccess.h>
52 #include <asm/semaphore.h>
53 #include <asm/mmu_context.h>
54 
55 #include "sys32.h"
56 
57 #undef DEBUG
58 
59 #ifdef DEBUG
60 #define DBG(x)	printk x
61 #else
62 #define DBG(x)
63 #endif
64 
65 /*
66  * sys32_execve() executes a new program.
67  */
68 
69 asmlinkage int sys32_execve(struct pt_regs *regs)
70 {
71 	int error;
72 	char *filename;
73 
74 	DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
75 	filename = getname((const char __user *) regs->gr[26]);
76 	error = PTR_ERR(filename);
77 	if (IS_ERR(filename))
78 		goto out;
79 	error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
80 				 compat_ptr(regs->gr[24]), regs);
81 	if (error == 0) {
82 		task_lock(current);
83 		current->ptrace &= ~PT_DTRACE;
84 		task_unlock(current);
85 	}
86 	putname(filename);
87 out:
88 
89 	return error;
90 }
91 
92 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
93 	int r22, int r21, int r20)
94 {
95     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
96     	current->comm, current->pid, r20);
97     return -ENOSYS;
98 }
99 
100 #ifdef CONFIG_SYSCTL
101 
102 struct __sysctl_args32 {
103 	u32 name;
104 	int nlen;
105 	u32 oldval;
106 	u32 oldlenp;
107 	u32 newval;
108 	u32 newlen;
109 	u32 __unused[4];
110 };
111 
112 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
113 {
114 #ifndef CONFIG_SYSCTL_SYSCALL
115 	return -ENOSYS;
116 #else
117 	struct __sysctl_args32 tmp;
118 	int error;
119 	unsigned int oldlen32;
120 	size_t oldlen, __user *oldlenp = NULL;
121 	unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
122 
123 	DBG(("sysctl32(%p)\n", args));
124 
125 	if (copy_from_user(&tmp, args, sizeof(tmp)))
126 		return -EFAULT;
127 
128 	if (tmp.oldval && tmp.oldlenp) {
129 		/* Duh, this is ugly and might not work if sysctl_args
130 		   is in read-only memory, but do_sysctl does indirectly
131 		   a lot of uaccess in both directions and we'd have to
132 		   basically copy the whole sysctl.c here, and
133 		   glibc's __sysctl uses rw memory for the structure
134 		   anyway.  */
135 		/* a possibly better hack than this, which will avoid the
136 		 * problem if the struct is read only, is to push the
137 		 * 'oldlen' value out to the user's stack instead. -PB
138 		 */
139 		if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
140 			return -EFAULT;
141 		oldlen = oldlen32;
142 		if (put_user(oldlen, (size_t *)addr))
143 			return -EFAULT;
144 		oldlenp = (size_t *)addr;
145 	}
146 
147 	lock_kernel();
148 	error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
149 			  (void __user *)(u64)tmp.oldval, oldlenp,
150 			  (void __user *)(u64)tmp.newval, tmp.newlen);
151 	unlock_kernel();
152 	if (oldlenp) {
153 		if (!error) {
154 			if (get_user(oldlen, (size_t *)addr)) {
155 				error = -EFAULT;
156 			} else {
157 				oldlen32 = oldlen;
158 				if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
159 					error = -EFAULT;
160 			}
161 		}
162 		if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
163 			error = -EFAULT;
164 	}
165 	return error;
166 #endif
167 }
168 
169 #endif /* CONFIG_SYSCTL */
170 
171 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
172 	struct compat_timespec __user *interval)
173 {
174 	struct timespec t;
175 	int ret;
176 
177 	KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
178 	if (put_compat_timespec(&t, interval))
179 		return -EFAULT;
180 	return ret;
181 }
182 
183 static int
184 put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
185 {
186 	struct compat_timeval t32;
187 	t32.tv_sec = t->tv_sec;
188 	t32.tv_usec = t->tv_usec;
189 	return copy_to_user(u, &t32, sizeof t32);
190 }
191 
192 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
193 {
194 	long usec;
195 
196 	if (__get_user(o->tv_sec, &i->tv_sec))
197 		return -EFAULT;
198 	if (__get_user(usec, &i->tv_usec))
199 		return -EFAULT;
200 	o->tv_nsec = usec * 1000;
201 	return 0;
202 }
203 
204 asmlinkage int
205 sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
206 {
207     extern void do_gettimeofday(struct timeval *tv);
208 
209     if (tv) {
210 	    struct timeval ktv;
211 	    do_gettimeofday(&ktv);
212 	    if (put_compat_timeval(tv, &ktv))
213 		    return -EFAULT;
214     }
215     if (tz) {
216 	    extern struct timezone sys_tz;
217 	    if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
218 		    return -EFAULT;
219     }
220     return 0;
221 }
222 
223 asmlinkage
224 int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
225 {
226 	struct timespec kts;
227 	struct timezone ktz;
228 
229  	if (tv) {
230 		if (get_ts32(&kts, tv))
231 			return -EFAULT;
232 	}
233 	if (tz) {
234 		if (copy_from_user(&ktz, tz, sizeof(ktz)))
235 			return -EFAULT;
236 	}
237 
238 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
239 }
240 
241 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
242 {
243 	compat_ino_t ino;
244 	int err;
245 
246 	if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
247 	    !new_valid_dev(stat->rdev))
248 		return -EOVERFLOW;
249 
250 	ino = stat->ino;
251 	if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
252 		return -EOVERFLOW;
253 
254 	err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
255 	err |= put_user(ino, &statbuf->st_ino);
256 	err |= put_user(stat->mode, &statbuf->st_mode);
257 	err |= put_user(stat->nlink, &statbuf->st_nlink);
258 	err |= put_user(0, &statbuf->st_reserved1);
259 	err |= put_user(0, &statbuf->st_reserved2);
260 	err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
261 	err |= put_user(stat->size, &statbuf->st_size);
262 	err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
263 	err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
264 	err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
265 	err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
266 	err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
267 	err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
268 	err |= put_user(stat->blksize, &statbuf->st_blksize);
269 	err |= put_user(stat->blocks, &statbuf->st_blocks);
270 	err |= put_user(0, &statbuf->__unused1);
271 	err |= put_user(0, &statbuf->__unused2);
272 	err |= put_user(0, &statbuf->__unused3);
273 	err |= put_user(0, &statbuf->__unused4);
274 	err |= put_user(0, &statbuf->__unused5);
275 	err |= put_user(0, &statbuf->st_fstype); /* not avail */
276 	err |= put_user(0, &statbuf->st_realdev); /* not avail */
277 	err |= put_user(0, &statbuf->st_basemode); /* not avail */
278 	err |= put_user(0, &statbuf->st_spareshort);
279 	err |= put_user(stat->uid, &statbuf->st_uid);
280 	err |= put_user(stat->gid, &statbuf->st_gid);
281 	err |= put_user(0, &statbuf->st_spare4[0]);
282 	err |= put_user(0, &statbuf->st_spare4[1]);
283 	err |= put_user(0, &statbuf->st_spare4[2]);
284 
285 	return err;
286 }
287 
288 /*** copied from mips64 ***/
289 /*
290  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
291  * 64-bit unsigned longs.
292  */
293 
294 static inline int
295 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
296 {
297 	n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
298 	if (ufdset) {
299 		unsigned long odd;
300 
301 		if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
302 			return -EFAULT;
303 
304 		odd = n & 1UL;
305 		n &= ~1UL;
306 		while (n) {
307 			unsigned long h, l;
308 			__get_user(l, ufdset);
309 			__get_user(h, ufdset+1);
310 			ufdset += 2;
311 			*fdset++ = h << 32 | l;
312 			n -= 2;
313 		}
314 		if (odd)
315 			__get_user(*fdset, ufdset);
316 	} else {
317 		/* Tricky, must clear full unsigned long in the
318 		 * kernel fdset at the end, this makes sure that
319 		 * actually happens.
320 		 */
321 		memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
322 	}
323 	return 0;
324 }
325 
326 static inline void
327 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
328 {
329 	unsigned long odd;
330 	n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
331 
332 	if (!ufdset)
333 		return;
334 
335 	odd = n & 1UL;
336 	n &= ~1UL;
337 	while (n) {
338 		unsigned long h, l;
339 		l = *fdset++;
340 		h = l >> 32;
341 		__put_user(l, ufdset);
342 		__put_user(h, ufdset+1);
343 		ufdset += 2;
344 		n -= 2;
345 	}
346 	if (odd)
347 		__put_user(*fdset, ufdset);
348 }
349 
350 struct msgbuf32 {
351     int mtype;
352     char mtext[1];
353 };
354 
355 asmlinkage long sys32_msgsnd(int msqid,
356 				struct msgbuf32 __user *umsgp32,
357 				size_t msgsz, int msgflg)
358 {
359 	struct msgbuf *mb;
360 	struct msgbuf32 mb32;
361 	int err;
362 
363 	if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
364 		return -ENOMEM;
365 
366 	err = get_user(mb32.mtype, &umsgp32->mtype);
367 	mb->mtype = mb32.mtype;
368 	err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
369 
370 	if (err)
371 		err = -EFAULT;
372 	else
373 		KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
374 
375 	kfree(mb);
376 	return err;
377 }
378 
379 asmlinkage long sys32_msgrcv(int msqid,
380 				struct msgbuf32 __user *umsgp32,
381 				size_t msgsz, long msgtyp, int msgflg)
382 {
383 	struct msgbuf *mb;
384 	struct msgbuf32 mb32;
385 	int err, len;
386 
387 	if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
388 		return -ENOMEM;
389 
390 	KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
391 
392 	if (err >= 0) {
393 		len = err;
394 		mb32.mtype = mb->mtype;
395 		err = put_user(mb32.mtype, &umsgp32->mtype);
396 		err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
397 		if (err)
398 			err = -EFAULT;
399 		else
400 			err = len;
401 	}
402 
403 	kfree(mb);
404 	return err;
405 }
406 
407 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
408 {
409         mm_segment_t old_fs = get_fs();
410         int ret;
411         off_t of;
412 
413         if (offset && get_user(of, offset))
414                 return -EFAULT;
415 
416         set_fs(KERNEL_DS);
417         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
418         set_fs(old_fs);
419 
420         if (offset && put_user(of, offset))
421                 return -EFAULT;
422 
423         return ret;
424 }
425 
426 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
427 {
428 	mm_segment_t old_fs = get_fs();
429 	int ret;
430 	loff_t lof;
431 
432 	if (offset && get_user(lof, offset))
433 		return -EFAULT;
434 
435 	set_fs(KERNEL_DS);
436 	ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
437 	set_fs(old_fs);
438 
439 	if (offset && put_user(lof, offset))
440 		return -EFAULT;
441 
442 	return ret;
443 }
444 
445 
446 /* lseek() needs a wrapper because 'offset' can be negative, but the top
447  * half of the argument has been zeroed by syscall.S.
448  */
449 
450 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
451 {
452 	return sys_lseek(fd, offset, origin);
453 }
454 
455 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
456 {
457         union semun u;
458 
459         if (cmd == SETVAL) {
460                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
461                  * The int should be in the first 4, but our argument
462                  * frobbing has left it in the last 4.
463                  */
464                 u.val = *((int *)&arg + 1);
465                 return sys_semctl (semid, semnum, cmd, u);
466 	}
467 	return sys_semctl (semid, semnum, cmd, arg);
468 }
469 
470 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
471 			  size_t len)
472 {
473 	return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
474 				  buf, len);
475 }
476