2 comedi/comedi_compat32.c
3 32-bit ioctl compatibility for 64-bit comedi kernel module.
5 Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
6 Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
8 COMEDI - Linux Control and Measurement Device Interface
9 Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <linux/uaccess.h>
28 #include <linux/compat.h>
31 #include "comedi_compat32.h"
33 #define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct)
34 #define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct)
35 /* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
36 * It's too late to change it now, but it only affects the command number. */
37 #define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct)
38 /* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
39 * It's too late to change it now, but it only affects the command number. */
40 #define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct)
41 #define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct)
42 #define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct)
44 struct comedi32_chaninfo_struct {
46 compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */
47 compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */
48 compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */
49 unsigned int unused[4];
52 struct comedi32_rangeinfo_struct {
53 unsigned int range_type;
54 compat_uptr_t range_ptr; /* 32-bit 'void *' */
57 struct comedi32_cmd_struct {
60 unsigned int start_src;
61 unsigned int start_arg;
62 unsigned int scan_begin_src;
63 unsigned int scan_begin_arg;
64 unsigned int convert_src;
65 unsigned int convert_arg;
66 unsigned int scan_end_src;
67 unsigned int scan_end_arg;
68 unsigned int stop_src;
69 unsigned int stop_arg;
70 compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */
71 unsigned int chanlist_len;
72 compat_uptr_t data; /* 32-bit 'short *' */
73 unsigned int data_len;
76 struct comedi32_insn_struct {
79 compat_uptr_t data; /* 32-bit 'unsigned int *' */
81 unsigned int chanspec;
82 unsigned int unused[3];
85 struct comedi32_insnlist_struct {
87 compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */
90 /* Handle translated ioctl. */
91 static int translated_ioctl(struct file *file, unsigned int cmd,
97 if (file->f_op->unlocked_ioctl)
98 return file->f_op->unlocked_ioctl(file, cmd, arg);
103 /* Handle 32-bit COMEDI_CHANINFO ioctl. */
104 static int compat_chaninfo(struct file *file, unsigned long arg)
106 struct comedi_chaninfo __user *chaninfo;
107 struct comedi32_chaninfo_struct __user *chaninfo32;
114 chaninfo32 = compat_ptr(arg);
115 chaninfo = compat_alloc_user_space(sizeof(*chaninfo));
117 /* Copy chaninfo structure. Ignore unused members. */
118 if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32))
119 || !access_ok(VERIFY_WRITE, chaninfo, sizeof(*chaninfo))) {
123 err |= __get_user(temp.uint, &chaninfo32->subdev);
124 err |= __put_user(temp.uint, &chaninfo->subdev);
125 err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
126 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
127 err |= __get_user(temp.uptr, &chaninfo32->flaglist);
128 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
129 err |= __get_user(temp.uptr, &chaninfo32->rangelist);
130 err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
134 return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
137 /* Handle 32-bit COMEDI_RANGEINFO ioctl. */
138 static int compat_rangeinfo(struct file *file, unsigned long arg)
140 struct comedi_rangeinfo __user *rangeinfo;
141 struct comedi32_rangeinfo_struct __user *rangeinfo32;
148 rangeinfo32 = compat_ptr(arg);
149 rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));
151 /* Copy rangeinfo structure. */
152 if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32))
153 || !access_ok(VERIFY_WRITE, rangeinfo, sizeof(*rangeinfo))) {
157 err |= __get_user(temp.uint, &rangeinfo32->range_type);
158 err |= __put_user(temp.uint, &rangeinfo->range_type);
159 err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
160 err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
164 return translated_ioctl(file, COMEDI_RANGEINFO,
165 (unsigned long)rangeinfo);
168 /* Copy 32-bit cmd structure to native cmd structure. */
169 static int get_compat_cmd(struct comedi_cmd __user *cmd,
170 struct comedi32_cmd_struct __user *cmd32)
178 /* Copy cmd structure. */
179 if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32))
180 || !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) {
184 err |= __get_user(temp.uint, &cmd32->subdev);
185 err |= __put_user(temp.uint, &cmd->subdev);
186 err |= __get_user(temp.uint, &cmd32->flags);
187 err |= __put_user(temp.uint, &cmd->flags);
188 err |= __get_user(temp.uint, &cmd32->start_src);
189 err |= __put_user(temp.uint, &cmd->start_src);
190 err |= __get_user(temp.uint, &cmd32->start_arg);
191 err |= __put_user(temp.uint, &cmd->start_arg);
192 err |= __get_user(temp.uint, &cmd32->scan_begin_src);
193 err |= __put_user(temp.uint, &cmd->scan_begin_src);
194 err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
195 err |= __put_user(temp.uint, &cmd->scan_begin_arg);
196 err |= __get_user(temp.uint, &cmd32->convert_src);
197 err |= __put_user(temp.uint, &cmd->convert_src);
198 err |= __get_user(temp.uint, &cmd32->convert_arg);
199 err |= __put_user(temp.uint, &cmd->convert_arg);
200 err |= __get_user(temp.uint, &cmd32->scan_end_src);
201 err |= __put_user(temp.uint, &cmd->scan_end_src);
202 err |= __get_user(temp.uint, &cmd32->scan_end_arg);
203 err |= __put_user(temp.uint, &cmd->scan_end_arg);
204 err |= __get_user(temp.uint, &cmd32->stop_src);
205 err |= __put_user(temp.uint, &cmd->stop_src);
206 err |= __get_user(temp.uint, &cmd32->stop_arg);
207 err |= __put_user(temp.uint, &cmd->stop_arg);
208 err |= __get_user(temp.uptr, &cmd32->chanlist);
209 err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist);
210 err |= __get_user(temp.uint, &cmd32->chanlist_len);
211 err |= __put_user(temp.uint, &cmd->chanlist_len);
212 err |= __get_user(temp.uptr, &cmd32->data);
213 err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
214 err |= __get_user(temp.uint, &cmd32->data_len);
215 err |= __put_user(temp.uint, &cmd->data_len);
216 return err ? -EFAULT : 0;
219 /* Copy native cmd structure to 32-bit cmd structure. */
220 static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
221 struct comedi_cmd __user *cmd)
226 /* Copy back most of cmd structure. */
227 /* Assume the pointer values are already valid. */
228 /* (Could use ptr_to_compat() to set them, but that wasn't implemented
229 * until kernel version 2.6.11.) */
230 if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd))
231 || !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) {
235 err |= __get_user(temp, &cmd->subdev);
236 err |= __put_user(temp, &cmd32->subdev);
237 err |= __get_user(temp, &cmd->flags);
238 err |= __put_user(temp, &cmd32->flags);
239 err |= __get_user(temp, &cmd->start_src);
240 err |= __put_user(temp, &cmd32->start_src);
241 err |= __get_user(temp, &cmd->start_arg);
242 err |= __put_user(temp, &cmd32->start_arg);
243 err |= __get_user(temp, &cmd->scan_begin_src);
244 err |= __put_user(temp, &cmd32->scan_begin_src);
245 err |= __get_user(temp, &cmd->scan_begin_arg);
246 err |= __put_user(temp, &cmd32->scan_begin_arg);
247 err |= __get_user(temp, &cmd->convert_src);
248 err |= __put_user(temp, &cmd32->convert_src);
249 err |= __get_user(temp, &cmd->convert_arg);
250 err |= __put_user(temp, &cmd32->convert_arg);
251 err |= __get_user(temp, &cmd->scan_end_src);
252 err |= __put_user(temp, &cmd32->scan_end_src);
253 err |= __get_user(temp, &cmd->scan_end_arg);
254 err |= __put_user(temp, &cmd32->scan_end_arg);
255 err |= __get_user(temp, &cmd->stop_src);
256 err |= __put_user(temp, &cmd32->stop_src);
257 err |= __get_user(temp, &cmd->stop_arg);
258 err |= __put_user(temp, &cmd32->stop_arg);
259 /* Assume chanlist pointer is unchanged. */
260 err |= __get_user(temp, &cmd->chanlist_len);
261 err |= __put_user(temp, &cmd32->chanlist_len);
262 /* Assume data pointer is unchanged. */
263 err |= __get_user(temp, &cmd->data_len);
264 err |= __put_user(temp, &cmd32->data_len);
265 return err ? -EFAULT : 0;
268 /* Handle 32-bit COMEDI_CMD ioctl. */
269 static int compat_cmd(struct file *file, unsigned long arg)
271 struct comedi_cmd __user *cmd;
272 struct comedi32_cmd_struct __user *cmd32;
275 cmd32 = compat_ptr(arg);
276 cmd = compat_alloc_user_space(sizeof(*cmd));
278 rc = get_compat_cmd(cmd, cmd32);
282 return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
285 /* Handle 32-bit COMEDI_CMDTEST ioctl. */
286 static int compat_cmdtest(struct file *file, unsigned long arg)
288 struct comedi_cmd __user *cmd;
289 struct comedi32_cmd_struct __user *cmd32;
292 cmd32 = compat_ptr(arg);
293 cmd = compat_alloc_user_space(sizeof(*cmd));
295 rc = get_compat_cmd(cmd, cmd32);
299 rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
303 err = put_compat_cmd(cmd32, cmd);
310 /* Copy 32-bit insn structure to native insn structure. */
311 static int get_compat_insn(struct comedi_insn __user *insn,
312 struct comedi32_insn_struct __user *insn32)
320 /* Copy insn structure. Ignore the unused members. */
322 if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32))
323 || !access_ok(VERIFY_WRITE, insn, sizeof(*insn)))
326 err |= __get_user(temp.uint, &insn32->insn);
327 err |= __put_user(temp.uint, &insn->insn);
328 err |= __get_user(temp.uint, &insn32->n);
329 err |= __put_user(temp.uint, &insn->n);
330 err |= __get_user(temp.uptr, &insn32->data);
331 err |= __put_user(compat_ptr(temp.uptr), &insn->data);
332 err |= __get_user(temp.uint, &insn32->subdev);
333 err |= __put_user(temp.uint, &insn->subdev);
334 err |= __get_user(temp.uint, &insn32->chanspec);
335 err |= __put_user(temp.uint, &insn->chanspec);
336 return err ? -EFAULT : 0;
339 /* Handle 32-bit COMEDI_INSNLIST ioctl. */
340 static int compat_insnlist(struct file *file, unsigned long arg)
342 struct combined_insnlist {
343 struct comedi_insnlist insnlist;
344 struct comedi_insn insn[1];
346 struct comedi32_insnlist_struct __user *insnlist32;
347 struct comedi32_insn_struct __user *insn32;
349 unsigned int n_insns, n;
352 insnlist32 = compat_ptr(arg);
354 /* Get 32-bit insnlist structure. */
355 if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32)))
359 err |= __get_user(n_insns, &insnlist32->n_insns);
360 err |= __get_user(uptr, &insnlist32->insns);
361 insn32 = compat_ptr(uptr);
365 /* Allocate user memory to copy insnlist and insns into. */
366 s = compat_alloc_user_space(offsetof(struct combined_insnlist,
369 /* Set native insnlist structure. */
370 if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist)))
373 err |= __put_user(n_insns, &s->insnlist.n_insns);
374 err |= __put_user(&s->insn[0], &s->insnlist.insns);
378 /* Copy insn structures. */
379 for (n = 0; n < n_insns; n++) {
380 rc = get_compat_insn(&s->insn[n], &insn32[n]);
385 return translated_ioctl(file, COMEDI_INSNLIST,
386 (unsigned long)&s->insnlist);
389 /* Handle 32-bit COMEDI_INSN ioctl. */
390 static int compat_insn(struct file *file, unsigned long arg)
392 struct comedi_insn __user *insn;
393 struct comedi32_insn_struct __user *insn32;
396 insn32 = compat_ptr(arg);
397 insn = compat_alloc_user_space(sizeof(*insn));
399 rc = get_compat_insn(insn, insn32);
403 return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
406 /* Process untranslated ioctl. */
407 /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */
408 static inline int raw_ioctl(struct file *file, unsigned int cmd,
414 case COMEDI_DEVCONFIG:
416 case COMEDI_SUBDINFO:
417 case COMEDI_BUFCONFIG:
419 /* Just need to translate the pointer argument. */
420 arg = (unsigned long)compat_ptr(arg);
421 rc = translated_ioctl(file, cmd, arg);
427 /* No translation needed. */
428 rc = translated_ioctl(file, cmd, arg);
430 case COMEDI32_CHANINFO:
431 rc = compat_chaninfo(file, arg);
433 case COMEDI32_RANGEINFO:
434 rc = compat_rangeinfo(file, arg);
437 rc = compat_cmd(file, arg);
439 case COMEDI32_CMDTEST:
440 rc = compat_cmdtest(file, arg);
442 case COMEDI32_INSNLIST:
443 rc = compat_insnlist(file, arg);
446 rc = compat_insn(file, arg);
455 /* compat_ioctl file operation. */
456 /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */
457 long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
459 return raw_ioctl(file, cmd, arg);