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spidev supports more communications modes
[linux-2.6/kvm.git] / arch / arm / kernel / sys_oabi-compat.c
blob8e2f9bc3368b0600f99c6eef4ae6c3cc70db1fe3
1 /*
2 * arch/arm/kernel/sys_oabi-compat.c
3 *
4 * Compatibility wrappers for syscalls that are used from
5 * old ABI user space binaries with an EABI kernel.
6 *
7 * Author: Nicolas Pitre
8 * Created: Oct 7, 2005
9 * Copyright: MontaVista Software, Inc.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 /*
17 * The legacy ABI and the new ARM EABI have different rules making some
18 * syscalls incompatible especially with structure arguments.
19 * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
20 * simply word aligned. EABI also pads structures to the size of the largest
21 * member it contains instead of the invariant 32-bit.
22 *
23 * The following syscalls are affected:
24 *
25 * sys_stat64:
26 * sys_lstat64:
27 * sys_fstat64:
28 *
29 * struct stat64 has different sizes and some members are shifted
30 * Compatibility wrappers are needed for them and provided below.
31 *
32 * sys_fcntl64:
33 *
34 * struct flock64 has different sizes and some members are shifted
35 * A compatibility wrapper is needed and provided below.
36 *
37 * sys_statfs64:
38 * sys_fstatfs64:
39 *
40 * struct statfs64 has extra padding with EABI growing its size from
41 * 84 to 88. This struct is now __attribute__((packed,aligned(4)))
42 * with a small assembly wrapper to force the sz argument to 84 if it is 88
43 * to avoid copying the extra padding over user space unexpecting it.
44 *
45 * sys_newuname:
46 *
47 * struct new_utsname has no padding with EABI. No problem there.
48 *
49 * sys_epoll_ctl:
50 * sys_epoll_wait:
51 *
52 * struct epoll_event has its second member shifted also affecting the
53 * structure size. Compatibility wrappers are needed and provided below.
54 *
55 * sys_ipc:
56 * sys_semop:
57 * sys_semtimedop:
58 *
59 * struct sembuf loses its padding with EABI. Since arrays of them are
60 * used they have to be copyed to remove the padding. Compatibility wrappers
61 * provided below.
62 *
63 * sys_bind:
64 * sys_connect:
65 * sys_sendmsg:
66 * sys_sendto:
67 * sys_socketcall:
68 *
69 * struct sockaddr_un loses its padding with EABI. Since the size of the
70 * structure is used as a validation test in unix_mkname(), we need to
71 * change the length argument to 110 whenever it is 112. Compatibility
72 * wrappers provided below.
73 */
74
75 #include <linux/syscalls.h>
76 #include <linux/errno.h>
77 #include <linux/fs.h>
78 #include <linux/fcntl.h>
79 #include <linux/eventpoll.h>
80 #include <linux/sem.h>
81 #include <linux/socket.h>
82 #include <linux/net.h>
83 #include <asm/ipc.h>
84 #include <asm/uaccess.h>
85
86 struct oldabi_stat64 {
87 unsigned long long st_dev;
88 unsigned int __pad1;
89 unsigned long __st_ino;
90 unsigned int st_mode;
91 unsigned int st_nlink;
92
93 unsigned long st_uid;
94 unsigned long st_gid;
95
96 unsigned long long st_rdev;
97 unsigned int __pad2;
98
99 long long st_size;
100 unsigned long st_blksize;
101 unsigned long long st_blocks;
102
103 unsigned long st_atime;
104 unsigned long st_atime_nsec;
105
106 unsigned long st_mtime;
107 unsigned long st_mtime_nsec;
108
109 unsigned long st_ctime;
110 unsigned long st_ctime_nsec;
111
112 unsigned long long st_ino;
113 } __attribute__ ((packed,aligned(4)));
114
115 static long cp_oldabi_stat64(struct kstat *stat,
116 struct oldabi_stat64 __user *statbuf)
117 {
118 struct oldabi_stat64 tmp;
119
120 tmp.st_dev = huge_encode_dev(stat->dev);
121 tmp.__pad1 = 0;
122 tmp.__st_ino = stat->ino;
123 tmp.st_mode = stat->mode;
124 tmp.st_nlink = stat->nlink;
125 tmp.st_uid = stat->uid;
126 tmp.st_gid = stat->gid;
127 tmp.st_rdev = huge_encode_dev(stat->rdev);
128 tmp.st_size = stat->size;
129 tmp.st_blocks = stat->blocks;
130 tmp.__pad2 = 0;
131 tmp.st_blksize = stat->blksize;
132 tmp.st_atime = stat->atime.tv_sec;
133 tmp.st_atime_nsec = stat->atime.tv_nsec;
134 tmp.st_mtime = stat->mtime.tv_sec;
135 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
136 tmp.st_ctime = stat->ctime.tv_sec;
137 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
138 tmp.st_ino = stat->ino;
139 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
140 }
141
142 asmlinkage long sys_oabi_stat64(char __user * filename,
143 struct oldabi_stat64 __user * statbuf)
144 {
145 struct kstat stat;
146 int error = vfs_stat(filename, &stat);
147 if (!error)
148 error = cp_oldabi_stat64(&stat, statbuf);
149 return error;
150 }
151
152 asmlinkage long sys_oabi_lstat64(char __user * filename,
153 struct oldabi_stat64 __user * statbuf)
154 {
155 struct kstat stat;
156 int error = vfs_lstat(filename, &stat);
157 if (!error)
158 error = cp_oldabi_stat64(&stat, statbuf);
159 return error;
160 }
161
162 asmlinkage long sys_oabi_fstat64(unsigned long fd,
163 struct oldabi_stat64 __user * statbuf)
164 {
165 struct kstat stat;
166 int error = vfs_fstat(fd, &stat);
167 if (!error)
168 error = cp_oldabi_stat64(&stat, statbuf);
169 return error;
170 }
171
172 struct oabi_flock64 {
173 short l_type;
174 short l_whence;
175 loff_t l_start;
176 loff_t l_len;
177 pid_t l_pid;
178 } __attribute__ ((packed,aligned(4)));
179
180 asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
181 unsigned long arg)
182 {
183 struct oabi_flock64 user;
184 struct flock64 kernel;
185 mm_segment_t fs = USER_DS; /* initialized to kill a warning */
186 unsigned long local_arg = arg;
187 int ret;
188
189 switch (cmd) {
190 case F_GETLK64:
191 case F_SETLK64:
192 case F_SETLKW64:
193 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
194 sizeof(user)))
195 return -EFAULT;
196 kernel.l_type = user.l_type;
197 kernel.l_whence = user.l_whence;
198 kernel.l_start = user.l_start;
199 kernel.l_len = user.l_len;
200 kernel.l_pid = user.l_pid;
201 local_arg = (unsigned long)&kernel;
202 fs = get_fs();
203 set_fs(KERNEL_DS);
204 }
205
206 ret = sys_fcntl64(fd, cmd, local_arg);
207
208 switch (cmd) {
209 case F_GETLK64:
210 if (!ret) {
211 user.l_type = kernel.l_type;
212 user.l_whence = kernel.l_whence;
213 user.l_start = kernel.l_start;
214 user.l_len = kernel.l_len;
215 user.l_pid = kernel.l_pid;
216 if (copy_to_user((struct oabi_flock64 __user *)arg,
217 &user, sizeof(user)))
218 ret = -EFAULT;
219 }
220 case F_SETLK64:
221 case F_SETLKW64:
222 set_fs(fs);
223 }
224
225 return ret;
226 }
227
228 struct oabi_epoll_event {
229 __u32 events;
230 __u64 data;
231 } __attribute__ ((packed,aligned(4)));
232
233 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
234 struct oabi_epoll_event __user *event)
235 {
236 struct oabi_epoll_event user;
237 struct epoll_event kernel;
238 mm_segment_t fs;
239 long ret;
240
241 if (op == EPOLL_CTL_DEL)
242 return sys_epoll_ctl(epfd, op, fd, NULL);
243 if (copy_from_user(&user, event, sizeof(user)))
244 return -EFAULT;
245 kernel.events = user.events;
246 kernel.data = user.data;
247 fs = get_fs();
248 set_fs(KERNEL_DS);
249 ret = sys_epoll_ctl(epfd, op, fd, &kernel);
250 set_fs(fs);
251 return ret;
252 }
253
254 asmlinkage long sys_oabi_epoll_wait(int epfd,
255 struct oabi_epoll_event __user *events,
256 int maxevents, int timeout)
257 {
258 struct epoll_event *kbuf;
259 mm_segment_t fs;
260 long ret, err, i;
261
262 if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event)))
263 return -EINVAL;
264 kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
265 if (!kbuf)
266 return -ENOMEM;
267 fs = get_fs();
268 set_fs(KERNEL_DS);
269 ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
270 set_fs(fs);
271 err = 0;
272 for (i = 0; i < ret; i++) {
273 __put_user_error(kbuf[i].events, &events->events, err);
274 __put_user_error(kbuf[i].data, &events->data, err);
275 events++;
276 }
277 kfree(kbuf);
278 return err ? -EFAULT : ret;
279 }
280
281 struct oabi_sembuf {
282 unsigned short sem_num;
283 short sem_op;
284 short sem_flg;
285 unsigned short __pad;
286 };
287
288 asmlinkage long sys_oabi_semtimedop(int semid,
289 struct oabi_sembuf __user *tsops,
290 unsigned nsops,
291 const struct timespec __user *timeout)
292 {
293 struct sembuf *sops;
294 struct timespec local_timeout;
295 long err;
296 int i;
297
298 if (nsops < 1)
299 return -EINVAL;
300 sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
301 if (!sops)
302 return -ENOMEM;
303 err = 0;
304 for (i = 0; i < nsops; i++) {
305 __get_user_error(sops[i].sem_num, &tsops->sem_num, err);
306 __get_user_error(sops[i].sem_op, &tsops->sem_op, err);
307 __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
308 tsops++;
309 }
310 if (timeout) {
311 /* copy this as well before changing domain protection */
312 err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
313 timeout = &local_timeout;
314 }
315 if (err) {
316 err = -EFAULT;
317 } else {
318 mm_segment_t fs = get_fs();
319 set_fs(KERNEL_DS);
320 err = sys_semtimedop(semid, sops, nsops, timeout);
321 set_fs(fs);
322 }
323 kfree(sops);
324 return err;
325 }
326
327 asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
328 unsigned nsops)
329 {
330 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
331 }
332
333 extern asmlinkage int sys_ipc(uint call, int first, int second, int third,
334 void __user *ptr, long fifth);
335
336 asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
337 void __user *ptr, long fifth)
338 {
339 switch (call & 0xffff) {
340 case SEMOP:
341 return sys_oabi_semtimedop(first,
342 (struct oabi_sembuf __user *)ptr,
343 second, NULL);
344 case SEMTIMEDOP:
345 return sys_oabi_semtimedop(first,
346 (struct oabi_sembuf __user *)ptr,
347 second,
348 (const struct timespec __user *)fifth);
349 default:
350 return sys_ipc(call, first, second, third, ptr, fifth);
351 }
352 }
353
354 asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
355 {
356 sa_family_t sa_family;
357 if (addrlen == 112 &&
358 get_user(sa_family, &addr->sa_family) == 0 &&
359 sa_family == AF_UNIX)
360 addrlen = 110;
361 return sys_bind(fd, addr, addrlen);
362 }
363
364 asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
365 {
366 sa_family_t sa_family;
367 if (addrlen == 112 &&
368 get_user(sa_family, &addr->sa_family) == 0 &&
369 sa_family == AF_UNIX)
370 addrlen = 110;
371 return sys_connect(fd, addr, addrlen);
372 }
373
374 asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
375 size_t len, unsigned flags,
376 struct sockaddr __user *addr,
377 int addrlen)
378 {
379 sa_family_t sa_family;
380 if (addrlen == 112 &&
381 get_user(sa_family, &addr->sa_family) == 0 &&
382 sa_family == AF_UNIX)
383 addrlen = 110;
384 return sys_sendto(fd, buff, len, flags, addr, addrlen);
385 }
386
387 asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
388 {
389 struct sockaddr __user *addr;
390 int msg_namelen;
391 sa_family_t sa_family;
392 if (msg &&
393 get_user(msg_namelen, &msg->msg_namelen) == 0 &&
394 msg_namelen == 112 &&
395 get_user(addr, &msg->msg_name) == 0 &&
396 get_user(sa_family, &addr->sa_family) == 0 &&
397 sa_family == AF_UNIX)
398 {
399 /*
400 * HACK ALERT: there is a limit to how much backward bending
401 * we should do for what is actually a transitional
402 * compatibility layer. This already has known flaws with
403 * a few ioctls that we don't intend to fix. Therefore
404 * consider this blatent hack as another one... and take care
405 * to run for cover. In most cases it will "just work fine".
406 * If it doesn't, well, tough.
407 */
408 put_user(110, &msg->msg_namelen);
409 }
410 return sys_sendmsg(fd, msg, flags);
411 }
412
413 asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
414 {
415 unsigned long r = -EFAULT, a[6];
416
417 switch (call) {
418 case SYS_BIND:
419 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
420 r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
421 break;
422 case SYS_CONNECT:
423 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
424 r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
425 break;
426 case SYS_SENDTO:
427 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
428 r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
429 (struct sockaddr __user *)a[4], a[5]);
430 break;
431 case SYS_SENDMSG:
432 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
433 r = sys_oabi_sendmsg(a[0], (struct msghdr __user *)a[1], a[2]);
434 break;
435 default:
436 r = sys_socketcall(call, args);
437 }
438
439 return r;
440 }
kernel-based virtual machine