10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #include <sys/types.h>
31 #include <sys/t_lock.h>
32 #include <sys/param.h>
33 #include <sys/cred.h>
34 #include <sys/debug.h>
35 #include <sys/inline.h>
36 #include <sys/kmem.h>
37 #include <sys/proc.h>
38 #include <sys/regset.h>
39 #include <sys/privregs.h>
40 #include <sys/sysmacros.h>
41 #include <sys/systm.h>
42 #include <sys/vfs.h>
43 #include <sys/vnode.h>
44 #include <sys/psw.h>
45 #include <sys/pcb.h>
46 #include <sys/buf.h>
47 #include <sys/signal.h>
48 #include <sys/user.h>
49 #include <sys/cpuvar.h>
50
51 #include <sys/fault.h>
52 #include <sys/syscall.h>
53 #include <sys/procfs.h>
54 #include <sys/cmn_err.h>
55 #include <sys/stack.h>
56 #include <sys/debugreg.h>
57 #include <sys/copyops.h>
58
59 #include <sys/vmem.h>
60 #include <sys/mman.h>
61 #include <sys/vmparam.h>
62 #include <sys/fp.h>
63 #include <sys/archsystm.h>
64 #include <sys/vmsystm.h>
65 #include <vm/hat.h>
66 #include <vm/as.h>
67 #include <vm/seg.h>
68 #include <vm/seg_kmem.h>
69 #include <vm/seg_kp.h>
219
220 /*
221 * Set floating-point registers.
222 * (Note: This can be an alias to setfpregs().)
223 */
224 void
225 prsetprfpregs(klwp_t *lwp, prfpregset_t *pfp)
226 {
227 setfpregs(lwp, pfp);
228 }
229
230 #if defined(_SYSCALL32_IMPL)
231 void
232 prsetprfpregs32(klwp_t *lwp, prfpregset32_t *pfp)
233 {
234 setfpregs32(lwp, pfp);
235 }
236 #endif /* _SYSCALL32_IMPL */
237
238 /*
239 * Does the system support extra register state?
240 */
241 /* ARGSUSED */
242 int
243 prhasx(proc_t *p)
244 {
245 return (0);
246 }
247
248 /*
249 * Get the size of the extra registers.
250 */
251 /* ARGSUSED */
252 int
253 prgetprxregsize(proc_t *p)
254 {
255 return (0);
256 }
257
258 /*
259 * Get extra registers.
260 */
261 /*ARGSUSED*/
262 void
263 prgetprxregs(klwp_t *lwp, caddr_t prx)
264 {
265 /* no extra registers */
266 }
267
268 /*
269 * Set extra registers.
270 */
271 /*ARGSUSED*/
272 void
273 prsetprxregs(klwp_t *lwp, caddr_t prx)
274 {
275 /* no extra registers */
276 }
277
278 /*
279 * Return the base (lower limit) of the process stack.
280 */
281 caddr_t
282 prgetstackbase(proc_t *p)
283 {
284 return (p->p_usrstack - p->p_stksize);
285 }
286
287 /*
288 * Return the "addr" field for pr_addr in prpsinfo_t.
289 * This is a vestige of the past, so whatever we return is OK.
290 */
291 caddr_t
292 prgetpsaddr(proc_t *p)
293 {
294 return ((caddr_t)p);
295 }
|
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Copyright 2023 Oxide Computer Company
32 */
33
34 #include <sys/types.h>
35 #include <sys/t_lock.h>
36 #include <sys/param.h>
37 #include <sys/cred.h>
38 #include <sys/debug.h>
39 #include <sys/inline.h>
40 #include <sys/kmem.h>
41 #include <sys/proc.h>
42 #include <sys/regset.h>
43 #include <sys/privregs.h>
44 #include <sys/sysmacros.h>
45 #include <sys/systm.h>
46 #include <sys/vfs.h>
47 #include <sys/vnode.h>
48 #include <sys/psw.h>
49 #include <sys/pcb.h>
50 #include <sys/buf.h>
51 #include <sys/signal.h>
52 #include <sys/user.h>
53 #include <sys/cpuvar.h>
54 #include <sys/stdalign.h>
55
56 #include <sys/fault.h>
57 #include <sys/syscall.h>
58 #include <sys/procfs.h>
59 #include <sys/cmn_err.h>
60 #include <sys/stack.h>
61 #include <sys/debugreg.h>
62 #include <sys/copyops.h>
63
64 #include <sys/vmem.h>
65 #include <sys/mman.h>
66 #include <sys/vmparam.h>
67 #include <sys/fp.h>
68 #include <sys/archsystm.h>
69 #include <sys/vmsystm.h>
70 #include <vm/hat.h>
71 #include <vm/as.h>
72 #include <vm/seg.h>
73 #include <vm/seg_kmem.h>
74 #include <vm/seg_kp.h>
224
225 /*
226 * Set floating-point registers.
227 * (Note: This can be an alias to setfpregs().)
228 */
229 void
230 prsetprfpregs(klwp_t *lwp, prfpregset_t *pfp)
231 {
232 setfpregs(lwp, pfp);
233 }
234
235 #if defined(_SYSCALL32_IMPL)
236 void
237 prsetprfpregs32(klwp_t *lwp, prfpregset32_t *pfp)
238 {
239 setfpregs32(lwp, pfp);
240 }
241 #endif /* _SYSCALL32_IMPL */
242
243 /*
244 * This is a general function that the main part of /proc and the rest of the
245 * system uses to ask does a given process actually have extended state. Right
246 * now, this question is not process-specific, but rather CPU specific. We look
247 * at whether xsave has been enabled to determine that. While strictly speaking
248 * one could make the argument that all amd64 CPUs support fxsave and we could
249 * emulate something that only supports that, we don't think that makes sense.
250 */
251 int
252 prhasx(proc_t *p)
253 {
254 return (fpu_xsave_enabled());
255 }
256
257 /*
258 * Return the minimum size that we need to determine the full size of a
259 * prxregset_t.
260 */
261 boolean_t
262 prwriteminxreg(size_t *sizep)
263 {
264 *sizep = sizeof (prxregset_hdr_t);
265 return (B_TRUE);
266 }
267
268 /*
269 * This routine services both ILP32 and LP64 callers. We cannot assume anything
270 * about the alignment of argp and must bcopy things to known structures that we
271 * care about. We are guaranteed we have prxregset_hdr_t bytes because we asked
272 * for them above.
273 */
274 boolean_t
275 prwritesizexreg(const void *argp, size_t *sizep)
276 {
277 prxregset_hdr_t hdr;
278
279 /*
280 * While it's tempting to validate everything here, the only thing we
281 * care about is that we understand the type and the size meets our
282 * constraints:
283 *
284 * o We actually have an item of type PR_TYPE_XSAVE, otherwise we
285 * don't know what this is.
286 * o The indicated size actually contains at least the
287 * prxregset_hdr_t.
288 * o The indicated size isn't larger than what the FPU tells us is
289 * allowed.
290 *
291 * We do not check if the reset of the structure makes semantic sense at
292 * this point. We save all other validation for the normal set function
293 * as that's when we'll have the rest of our data.
294 */
295 bcopy(argp, &hdr, sizeof (hdr));
296 if (hdr.pr_type != PR_TYPE_XSAVE ||
297 hdr.pr_size > fpu_proc_xregs_max_size() ||
298 hdr.pr_size < sizeof (prxregset_hdr_t)) {
299 return (B_FALSE);
300 }
301
302 *sizep = hdr.pr_size - sizeof (prxregset_hdr_t);
303 return (B_TRUE);
304 }
305
306 /*
307 * Get the size of the extra registers. The ultimate size here depends on a
308 * combination of a few different things. Right now the xregs always have our
309 * header, the illumos-specific XCR information, the xsave information, and then
310 * otherwise this varies based on the items that the CPU supports.
311 *
312 * The ultimate size here is going to be:
313 *
314 * o 1x prxregset_hdr_t
315 * o n prxregset_info_t structures
316 * o The individual data for each one
317 */
318 size_t
319 prgetprxregsize(proc_t *p)
320 {
321 uint32_t size;
322
323 fpu_proc_xregs_info(p, NULL, &size, NULL);
324 return (size);
325 }
326
327 /*
328 * Get extra registers.
329 */
330 void
331 prgetprxregs(klwp_t *lwp, prxregset_t *prx)
332 {
333 fpu_proc_xregs_get(lwp, prx);
334 }
335
336 /*
337 * Set extra registers.
338 *
339 * We've been given a regset to set. Before we hand it off to the FPU, we have
340 * to go through and make sure that the different parts of this actually make
341 * sense. The kernel has guaranteed us through the functions above that we have
342 * the number of bytes that the header indicates are present. In particular we
343 * need to validate:
344 *
345 * o The information in the header is reasonable: we have a known type, flags
346 * and padding are zero, and there is at least one info structure.
347 * o Each of the info structures has a valid type, size, and fits within the
348 * data we were given.
349 * o We do not validate or modify the actual data in the different pieces for
350 * validity. That is considered something that the FPU does. Similarly if
351 * something is read-only or not used, that is something that it checks.
352 *
353 * While we would like to return something other than EINVAL, the /proc APIs
354 * pretty much lead that to being the primary errno for all sorts of situations.
355 */
356 int
357 prsetprxregs(klwp_t *lwp, prxregset_t *prx)
358 {
359 size_t infosz;
360 prxregset_hdr_t *hdr = (prxregset_hdr_t *)prx;
361
362 if (hdr->pr_type != PR_TYPE_XSAVE || hdr->pr_flags != 0 ||
363 hdr->pr_pad[0] != 0 || hdr->pr_pad[1] != 0 || hdr->pr_pad[2] != 0 ||
364 hdr->pr_pad[3] != 0 || hdr->pr_ninfo == 0) {
365 return (EINVAL);
366 }
367
368 infosz = hdr->pr_ninfo * sizeof (prxregset_info_t) +
369 sizeof (prxregset_hdr_t);
370 if (infosz > hdr->pr_size) {
371 return (EINVAL);
372 }
373
374 for (uint32_t i = 0; i < hdr->pr_ninfo; i++) {
375 uint32_t exp_size;
376 size_t need_len, exp_align;
377 const prxregset_info_t *info = &hdr->pr_info[i];
378
379 switch (info->pri_type) {
380 case PRX_INFO_XCR:
381 exp_size = sizeof (prxregset_xcr_t);
382 exp_align = alignof (prxregset_xcr_t);
383 break;
384 case PRX_INFO_XSAVE:
385 exp_size = sizeof (prxregset_xsave_t);
386 exp_align = alignof (prxregset_xsave_t);
387 break;
388 case PRX_INFO_YMM:
389 exp_size = sizeof (prxregset_ymm_t);
390 exp_align = alignof (prxregset_ymm_t);
391 break;
392 case PRX_INFO_OPMASK:
393 exp_size = sizeof (prxregset_opmask_t);
394 exp_align = alignof (prxregset_opmask_t);
395 break;
396 case PRX_INFO_ZMM:
397 exp_size = sizeof (prxregset_zmm_t);
398 exp_align = alignof (prxregset_zmm_t);
399 break;
400 case PRX_INFO_HI_ZMM:
401 exp_size = sizeof (prxregset_hi_zmm_t);
402 exp_align = alignof (prxregset_hi_zmm_t);
403 break;
404 default:
405 return (EINVAL);
406 }
407
408 if (info->pri_flags != 0 || info->pri_size != exp_size) {
409 return (EINVAL);
410 }
411
412 if ((info->pri_offset % exp_align) != 0) {
413 return (EINVAL);
414 }
415
416 /*
417 * No bytes of this item's entry should overlap with the
418 * information area. If users want to overlap the actual data
419 * information for some odd reason, we don't check that and let
420 * them do what they want. However, the total data for this
421 * region must actually fit. Because exp_size and pri_offset are
422 * uint32_t's, we can sum them without overflow worries in an
423 * LP64 environment.
424 *
425 * While we try to grantee alignment when writing this structure
426 * out to userland, that is in no way a requirement and users
427 * are allowed to start these structures wherever they want.
428 * Hence that is not checked here.
429 */
430 need_len = (size_t)exp_size + (size_t)info->pri_offset;
431 if (info->pri_offset < infosz ||
432 need_len > (size_t)hdr->pr_size) {
433 return (EINVAL);
434 }
435 }
436
437 return (fpu_proc_xregs_set(lwp, prx));
438 }
439
440 /*
441 * Return the base (lower limit) of the process stack.
442 */
443 caddr_t
444 prgetstackbase(proc_t *p)
445 {
446 return (p->p_usrstack - p->p_stksize);
447 }
448
449 /*
450 * Return the "addr" field for pr_addr in prpsinfo_t.
451 * This is a vestige of the past, so whatever we return is OK.
452 */
453 caddr_t
454 prgetpsaddr(proc_t *p)
455 {
456 return ((caddr_t)p);
457 }
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