1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
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 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <sys/types.h>
30 #include <sys/sysmacros.h>
31
32 #include <assert.h>
33 #include <limits.h>
34 #include <strings.h>
35 #include <stdlib.h>
36 #include <alloca.h>
37 #include <unistd.h>
38 #include <errno.h>
39
40 #include <dt_provider.h>
41 #include <dt_module.h>
42 #include <dt_string.h>
43 #include <dt_list.h>
44
45 static dt_provider_t *
46 dt_provider_insert(dtrace_hdl_t *dtp, dt_provider_t *pvp, uint_t h)
47 {
48 dt_list_append(&dtp->dt_provlist, pvp);
49
50 pvp->pv_next = dtp->dt_provs[h];
51 dtp->dt_provs[h] = pvp;
52 dtp->dt_nprovs++;
53
54 return (pvp);
55 }
56
57 dt_provider_t *
58 dt_provider_lookup(dtrace_hdl_t *dtp, const char *name)
59 {
60 uint_t h = dt_strtab_hash(name, NULL) % dtp->dt_provbuckets;
61 dtrace_providerdesc_t desc;
62 dt_provider_t *pvp;
63
64 for (pvp = dtp->dt_provs[h]; pvp != NULL; pvp = pvp->pv_next) {
65 if (strcmp(pvp->pv_desc.dtvd_name, name) == 0)
66 return (pvp);
67 }
68
69 if (strisglob(name) || name[0] == '\0') {
70 (void) dt_set_errno(dtp, EDT_NOPROV);
71 return (NULL);
72 }
73
74 bzero(&desc, sizeof (desc));
75 (void) strlcpy(desc.dtvd_name, name, DTRACE_PROVNAMELEN);
76
77 if (dt_ioctl(dtp, DTRACEIOC_PROVIDER, &desc) == -1) {
78 (void) dt_set_errno(dtp, errno == ESRCH ? EDT_NOPROV : errno);
79 return (NULL);
80 }
81
82 if ((pvp = dt_provider_create(dtp, name)) == NULL)
83 return (NULL); /* dt_errno is set for us */
84
85 bcopy(&desc, &pvp->pv_desc, sizeof (desc));
86 pvp->pv_flags |= DT_PROVIDER_IMPL;
87 return (pvp);
88 }
89
90 dt_provider_t *
91 dt_provider_create(dtrace_hdl_t *dtp, const char *name)
92 {
93 dt_provider_t *pvp;
94
95 if ((pvp = dt_zalloc(dtp, sizeof (dt_provider_t))) == NULL)
96 return (NULL);
97
98 (void) strlcpy(pvp->pv_desc.dtvd_name, name, DTRACE_PROVNAMELEN);
99 pvp->pv_probes = dt_idhash_create(pvp->pv_desc.dtvd_name, NULL, 0, 0);
100 pvp->pv_gen = dtp->dt_gen;
101 pvp->pv_hdl = dtp;
102
103 if (pvp->pv_probes == NULL) {
104 dt_free(dtp, pvp);
105 (void) dt_set_errno(dtp, EDT_NOMEM);
106 return (NULL);
107 }
108
109 pvp->pv_desc.dtvd_attr.dtpa_provider = _dtrace_prvattr;
110 pvp->pv_desc.dtvd_attr.dtpa_mod = _dtrace_prvattr;
111 pvp->pv_desc.dtvd_attr.dtpa_func = _dtrace_prvattr;
112 pvp->pv_desc.dtvd_attr.dtpa_name = _dtrace_prvattr;
113 pvp->pv_desc.dtvd_attr.dtpa_args = _dtrace_prvattr;
114
115 return (dt_provider_insert(dtp, pvp,
116 dt_strtab_hash(name, NULL) % dtp->dt_provbuckets));
117 }
118
119 void
120 dt_provider_destroy(dtrace_hdl_t *dtp, dt_provider_t *pvp)
121 {
122 dt_provider_t **pp;
123 uint_t h;
124
125 assert(pvp->pv_hdl == dtp);
126
127 h = dt_strtab_hash(pvp->pv_desc.dtvd_name, NULL) % dtp->dt_provbuckets;
128 pp = &dtp->dt_provs[h];
129
130 while (*pp != NULL && *pp != pvp)
131 pp = &(*pp)->pv_next;
132
133 assert(*pp != NULL && *pp == pvp);
134 *pp = pvp->pv_next;
135
136 dt_list_delete(&dtp->dt_provlist, pvp);
137 dtp->dt_nprovs--;
138
139 if (pvp->pv_probes != NULL)
140 dt_idhash_destroy(pvp->pv_probes);
141
142 dt_node_link_free(&pvp->pv_nodes);
143 dt_free(dtp, pvp->pv_xrefs);
144 dt_free(dtp, pvp);
145 }
146
147 int
148 dt_provider_xref(dtrace_hdl_t *dtp, dt_provider_t *pvp, id_t id)
149 {
150 size_t oldsize = BT_SIZEOFMAP(pvp->pv_xrmax);
151 size_t newsize = BT_SIZEOFMAP(dtp->dt_xlatorid);
152
153 assert(id >= 0 && id < dtp->dt_xlatorid);
154
155 if (newsize > oldsize) {
156 ulong_t *xrefs = dt_zalloc(dtp, newsize);
157
158 if (xrefs == NULL)
159 return (-1);
160
161 bcopy(pvp->pv_xrefs, xrefs, oldsize);
162 dt_free(dtp, pvp->pv_xrefs);
163
164 pvp->pv_xrefs = xrefs;
165 pvp->pv_xrmax = dtp->dt_xlatorid;
166 }
167
168 BT_SET(pvp->pv_xrefs, id);
169 return (0);
170 }
171
172 static uint8_t
173 dt_probe_argmap(dt_node_t *xnp, dt_node_t *nnp)
174 {
175 uint8_t i;
176
177 for (i = 0; nnp != NULL; i++) {
178 if (nnp->dn_string != NULL &&
179 strcmp(nnp->dn_string, xnp->dn_string) == 0)
180 break;
181 else
182 nnp = nnp->dn_list;
183 }
184
185 return (i);
186 }
187
188 static dt_node_t *
189 dt_probe_alloc_args(dt_provider_t *pvp, int argc)
190 {
191 dt_node_t *args = NULL, *pnp = NULL, *dnp;
192 int i;
193
194 for (i = 0; i < argc; i++, pnp = dnp) {
195 if ((dnp = dt_node_xalloc(pvp->pv_hdl, DT_NODE_TYPE)) == NULL)
196 return (NULL);
197
198 dnp->dn_link = pvp->pv_nodes;
199 pvp->pv_nodes = dnp;
200
201 if (args == NULL)
202 args = dnp;
203 else
204 pnp->dn_list = dnp;
205 }
206
207 return (args);
208 }
209
210 static size_t
211 dt_probe_keylen(const dtrace_probedesc_t *pdp)
212 {
213 return (strlen(pdp->dtpd_mod) + 1 +
214 strlen(pdp->dtpd_func) + 1 + strlen(pdp->dtpd_name) + 1);
215 }
216
217 static char *
218 dt_probe_key(const dtrace_probedesc_t *pdp, char *s)
219 {
220 (void) snprintf(s, INT_MAX, "%s:%s:%s",
221 pdp->dtpd_mod, pdp->dtpd_func, pdp->dtpd_name);
222 return (s);
223 }
224
225 /*
226 * If a probe was discovered from the kernel, ask dtrace(7D) for a description
227 * of each of its arguments, including native and translated types.
228 */
229 static dt_probe_t *
230 dt_probe_discover(dt_provider_t *pvp, const dtrace_probedesc_t *pdp)
231 {
232 dtrace_hdl_t *dtp = pvp->pv_hdl;
233 char *name = dt_probe_key(pdp, alloca(dt_probe_keylen(pdp)));
234
235 dt_node_t *xargs, *nargs;
236 dt_ident_t *idp;
237 dt_probe_t *prp;
238
239 dtrace_typeinfo_t dtt;
240 int i, nc, xc;
241
242 int adc = _dtrace_argmax;
243 dtrace_argdesc_t *adv = alloca(sizeof (dtrace_argdesc_t) * adc);
244 dtrace_argdesc_t *adp = adv;
245
246 assert(strcmp(pvp->pv_desc.dtvd_name, pdp->dtpd_provider) == 0);
247 assert(pdp->dtpd_id != DTRACE_IDNONE);
248
249 dt_dprintf("discovering probe %s:%s id=%d\n",
250 pvp->pv_desc.dtvd_name, name, pdp->dtpd_id);
251
252 for (nc = -1, i = 0; i < adc; i++, adp++) {
253 bzero(adp, sizeof (dtrace_argdesc_t));
254 adp->dtargd_ndx = i;
255 adp->dtargd_id = pdp->dtpd_id;
256
257 if (dt_ioctl(dtp, DTRACEIOC_PROBEARG, adp) != 0) {
258 (void) dt_set_errno(dtp, errno);
259 return (NULL);
260 }
261
262 if (adp->dtargd_ndx == DTRACE_ARGNONE)
263 break; /* all argument descs have been retrieved */
264
265 nc = MAX(nc, adp->dtargd_mapping);
266 }
267
268 xc = i;
269 nc++;
270
271 /*
272 * Now that we have discovered the number of native and translated
273 * arguments from the argument descriptions, allocate a new probe ident
274 * and corresponding dt_probe_t and hash it into the provider.
275 */
276 xargs = dt_probe_alloc_args(pvp, xc);
277 nargs = dt_probe_alloc_args(pvp, nc);
278
279 if ((xc != 0 && xargs == NULL) || (nc != 0 && nargs == NULL))
280 return (NULL); /* dt_errno is set for us */
281
282 idp = dt_ident_create(name, DT_IDENT_PROBE,
283 DT_IDFLG_ORPHAN, pdp->dtpd_id, _dtrace_defattr, 0,
284 &dt_idops_probe, NULL, dtp->dt_gen);
285
286 if (idp == NULL) {
287 (void) dt_set_errno(dtp, EDT_NOMEM);
288 return (NULL);
289 }
290
291 if ((prp = dt_probe_create(dtp, idp, 2,
292 nargs, nc, xargs, xc)) == NULL) {
293 dt_ident_destroy(idp);
294 return (NULL);
295 }
296
297 dt_probe_declare(pvp, prp);
298
299 /*
300 * Once our new dt_probe_t is fully constructed, iterate over the
301 * cached argument descriptions and assign types to prp->pr_nargv[]
302 * and prp->pr_xargv[] and assign mappings to prp->pr_mapping[].
303 */
304 for (adp = adv, i = 0; i < xc; i++, adp++) {
305 if (dtrace_type_strcompile(dtp,
306 adp->dtargd_native, &dtt) != 0) {
307 dt_dprintf("failed to resolve input type %s "
308 "for %s:%s arg #%d: %s\n", adp->dtargd_native,
309 pvp->pv_desc.dtvd_name, name, i + 1,
310 dtrace_errmsg(dtp, dtrace_errno(dtp)));
311
312 dtt.dtt_object = NULL;
313 dtt.dtt_ctfp = NULL;
314 dtt.dtt_type = CTF_ERR;
315 } else {
316 dt_node_type_assign(prp->pr_nargv[adp->dtargd_mapping],
317 dtt.dtt_ctfp, dtt.dtt_type);
318 }
319
320 if (dtt.dtt_type != CTF_ERR && (adp->dtargd_xlate[0] == '\0' ||
321 strcmp(adp->dtargd_native, adp->dtargd_xlate) == 0)) {
322 dt_node_type_propagate(prp->pr_nargv[
323 adp->dtargd_mapping], prp->pr_xargv[i]);
324 } else if (dtrace_type_strcompile(dtp,
325 adp->dtargd_xlate, &dtt) != 0) {
326 dt_dprintf("failed to resolve output type %s "
327 "for %s:%s arg #%d: %s\n", adp->dtargd_xlate,
328 pvp->pv_desc.dtvd_name, name, i + 1,
329 dtrace_errmsg(dtp, dtrace_errno(dtp)));
330
331 dtt.dtt_object = NULL;
332 dtt.dtt_ctfp = NULL;
333 dtt.dtt_type = CTF_ERR;
334 } else {
335 dt_node_type_assign(prp->pr_xargv[i],
336 dtt.dtt_ctfp, dtt.dtt_type);
337 }
338
339 prp->pr_mapping[i] = adp->dtargd_mapping;
340 prp->pr_argv[i] = dtt;
341 }
342
343 return (prp);
344 }
345
346 /*
347 * Lookup a probe declaration based on a known provider and full or partially
348 * specified module, function, and name. If the probe is not known to us yet,
349 * ask dtrace(7D) to match the description and then cache any useful results.
350 */
351 dt_probe_t *
352 dt_probe_lookup(dt_provider_t *pvp, const char *s)
353 {
354 dtrace_hdl_t *dtp = pvp->pv_hdl;
355 dtrace_probedesc_t pd;
356 dt_ident_t *idp;
357 size_t keylen;
358 char *key;
359
360 if (dtrace_str2desc(dtp, DTRACE_PROBESPEC_NAME, s, &pd) != 0)
361 return (NULL); /* dt_errno is set for us */
362
363 keylen = dt_probe_keylen(&pd);
364 key = dt_probe_key(&pd, alloca(keylen));
365
366 /*
367 * If the probe is already declared, then return the dt_probe_t from
368 * the existing identifier. This could come from a static declaration
369 * or it could have been cached from an earlier call to this function.
370 */
371 if ((idp = dt_idhash_lookup(pvp->pv_probes, key)) != NULL)
372 return (idp->di_data);
373
374 /*
375 * If the probe isn't known, use the probe description computed above
376 * to ask dtrace(7D) to find the first matching probe.
377 */
378 if (dt_ioctl(dtp, DTRACEIOC_PROBEMATCH, &pd) == 0)
379 return (dt_probe_discover(pvp, &pd));
380
381 if (errno == ESRCH || errno == EBADF)
382 (void) dt_set_errno(dtp, EDT_NOPROBE);
383 else
384 (void) dt_set_errno(dtp, errno);
385
386 return (NULL);
387 }
388
389 dt_probe_t *
390 dt_probe_create(dtrace_hdl_t *dtp, dt_ident_t *idp, int protoc,
391 dt_node_t *nargs, uint_t nargc, dt_node_t *xargs, uint_t xargc)
392 {
393 dt_module_t *dmp;
394 dt_probe_t *prp;
395 const char *p;
396 uint_t i;
397
398 assert(idp->di_kind == DT_IDENT_PROBE);
399 assert(idp->di_data == NULL);
400
401 /*
402 * If only a single prototype is given, set xargc/s to nargc/s to
403 * simplify subsequent use. Note that we can have one or both of nargs
404 * and xargs be specified but set to NULL, indicating a void prototype.
405 */
406 if (protoc < 2) {
407 assert(xargs == NULL);
408 assert(xargc == 0);
409 xargs = nargs;
410 xargc = nargc;
411 }
412
413 if ((prp = dt_alloc(dtp, sizeof (dt_probe_t))) == NULL)
414 return (NULL);
415
416 prp->pr_pvp = NULL;
417 prp->pr_ident = idp;
418
419 p = strrchr(idp->di_name, ':');
420 assert(p != NULL);
421 prp->pr_name = p + 1;
422
423 prp->pr_nargs = nargs;
424 prp->pr_nargv = dt_alloc(dtp, sizeof (dt_node_t *) * nargc);
425 prp->pr_nargc = nargc;
426 prp->pr_xargs = xargs;
427 prp->pr_xargv = dt_alloc(dtp, sizeof (dt_node_t *) * xargc);
428 prp->pr_xargc = xargc;
429 prp->pr_mapping = dt_alloc(dtp, sizeof (uint8_t) * xargc);
430 prp->pr_inst = NULL;
431 prp->pr_argv = dt_alloc(dtp, sizeof (dtrace_typeinfo_t) * xargc);
432 prp->pr_argc = xargc;
433
434 if ((prp->pr_nargc != 0 && prp->pr_nargv == NULL) ||
435 (prp->pr_xargc != 0 && prp->pr_xargv == NULL) ||
436 (prp->pr_xargc != 0 && prp->pr_mapping == NULL) ||
437 (prp->pr_argc != 0 && prp->pr_argv == NULL)) {
438 dt_probe_destroy(prp);
439 return (NULL);
440 }
441
442 for (i = 0; i < xargc; i++, xargs = xargs->dn_list) {
443 if (xargs->dn_string != NULL)
444 prp->pr_mapping[i] = dt_probe_argmap(xargs, nargs);
445 else
446 prp->pr_mapping[i] = i;
447
448 prp->pr_xargv[i] = xargs;
449
450 if ((dmp = dt_module_lookup_by_ctf(dtp,
451 xargs->dn_ctfp)) != NULL)
452 prp->pr_argv[i].dtt_object = dmp->dm_name;
453 else
454 prp->pr_argv[i].dtt_object = NULL;
455
456 prp->pr_argv[i].dtt_ctfp = xargs->dn_ctfp;
457 prp->pr_argv[i].dtt_type = xargs->dn_type;
458 }
459
460 for (i = 0; i < nargc; i++, nargs = nargs->dn_list)
461 prp->pr_nargv[i] = nargs;
462
463 idp->di_data = prp;
464 return (prp);
465 }
466
467 void
468 dt_probe_declare(dt_provider_t *pvp, dt_probe_t *prp)
469 {
470 assert(prp->pr_ident->di_kind == DT_IDENT_PROBE);
471 assert(prp->pr_ident->di_data == prp);
472 assert(prp->pr_pvp == NULL);
473
474 if (prp->pr_xargs != prp->pr_nargs)
475 pvp->pv_flags &= ~DT_PROVIDER_INTF;
476
477 prp->pr_pvp = pvp;
478 dt_idhash_xinsert(pvp->pv_probes, prp->pr_ident);
479 }
480
481 void
482 dt_probe_destroy(dt_probe_t *prp)
483 {
484 dt_probe_instance_t *pip, *pip_next;
485 dtrace_hdl_t *dtp;
486
487 if (prp->pr_pvp != NULL)
488 dtp = prp->pr_pvp->pv_hdl;
489 else
490 dtp = yypcb->pcb_hdl;
491
492 dt_node_list_free(&prp->pr_nargs);
493 dt_node_list_free(&prp->pr_xargs);
494
495 dt_free(dtp, prp->pr_nargv);
496 dt_free(dtp, prp->pr_xargv);
497
498 for (pip = prp->pr_inst; pip != NULL; pip = pip_next) {
499 pip_next = pip->pi_next;
500 dt_free(dtp, pip->pi_offs);
501 dt_free(dtp, pip->pi_enoffs);
502 dt_free(dtp, pip);
503 }
504
505 dt_free(dtp, prp->pr_mapping);
506 dt_free(dtp, prp->pr_argv);
507 dt_free(dtp, prp);
508 }
509
510 int
511 dt_probe_define(dt_provider_t *pvp, dt_probe_t *prp,
512 const char *fname, const char *rname, uint32_t offset, int isenabled)
513 {
514 dtrace_hdl_t *dtp = pvp->pv_hdl;
515 dt_probe_instance_t *pip;
516 uint32_t **offs;
517 uint_t *noffs, *maxoffs;
518
519 assert(fname != NULL);
520
521 for (pip = prp->pr_inst; pip != NULL; pip = pip->pi_next) {
522 if (strcmp(pip->pi_fname, fname) == 0 &&
523 ((rname == NULL && pip->pi_rname[0] == '\0') ||
524 (rname != NULL && strcmp(pip->pi_rname, rname)) == 0))
525 break;
526 }
527
528 if (pip == NULL) {
529 if ((pip = dt_zalloc(dtp, sizeof (*pip))) == NULL)
530 return (-1);
531
532 if ((pip->pi_offs = dt_zalloc(dtp,
533 sizeof (uint32_t))) == NULL) {
534 dt_free(dtp, pip);
535 return (-1);
536 }
537
538 if ((pip->pi_enoffs = dt_zalloc(dtp,
539 sizeof (uint32_t))) == NULL) {
540 dt_free(dtp, pip->pi_offs);
541 dt_free(dtp, pip);
542 return (-1);
543 }
544
545 (void) strlcpy(pip->pi_fname, fname, sizeof (pip->pi_fname));
546 if (rname != NULL) {
547 if (strlen(rname) + 1 > sizeof (pip->pi_rname)) {
548 dt_free(dtp, pip->pi_offs);
549 dt_free(dtp, pip);
550 return (dt_set_errno(dtp, EDT_COMPILER));
551 }
552 (void) strcpy(pip->pi_rname, rname);
553 }
554
555 pip->pi_noffs = 0;
556 pip->pi_maxoffs = 1;
557 pip->pi_nenoffs = 0;
558 pip->pi_maxenoffs = 1;
559
560 pip->pi_next = prp->pr_inst;
561
562 prp->pr_inst = pip;
563 }
564
565 if (isenabled) {
566 offs = &pip->pi_enoffs;
567 noffs = &pip->pi_nenoffs;
568 maxoffs = &pip->pi_maxenoffs;
569 } else {
570 offs = &pip->pi_offs;
571 noffs = &pip->pi_noffs;
572 maxoffs = &pip->pi_maxoffs;
573 }
574
575 if (*noffs == *maxoffs) {
576 uint_t new_max = *maxoffs * 2;
577 uint32_t *new_offs = dt_alloc(dtp, sizeof (uint32_t) * new_max);
578
579 if (new_offs == NULL)
580 return (-1);
581
582 bcopy(*offs, new_offs, sizeof (uint32_t) * *maxoffs);
583
584 dt_free(dtp, *offs);
585 *maxoffs = new_max;
586 *offs = new_offs;
587 }
588
589 dt_dprintf("defined probe %s %s:%s %s() +0x%x (%s)\n",
590 isenabled ? "(is-enabled)" : "",
591 pvp->pv_desc.dtvd_name, prp->pr_ident->di_name, fname, offset,
592 rname != NULL ? rname : fname);
593
594 assert(*noffs < *maxoffs);
595 (*offs)[(*noffs)++] = offset;
596
597 return (0);
598 }
599
600 /*
601 * Lookup the dynamic translator type tag for the specified probe argument and
602 * assign the type to the specified node. If the type is not yet defined, add
603 * it to the "D" module's type container as a typedef for an unknown type.
604 */
605 dt_node_t *
606 dt_probe_tag(dt_probe_t *prp, uint_t argn, dt_node_t *dnp)
607 {
608 dtrace_hdl_t *dtp = prp->pr_pvp->pv_hdl;
609 dtrace_typeinfo_t dtt;
610 size_t len;
611 char *tag;
612
613 len = snprintf(NULL, 0, "__dtrace_%s___%s_arg%u",
614 prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn);
615
616 tag = alloca(len + 1);
617
618 (void) snprintf(tag, len + 1, "__dtrace_%s___%s_arg%u",
619 prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn);
620
621 if (dtrace_lookup_by_type(dtp, DTRACE_OBJ_DDEFS, tag, &dtt) != 0) {
622 dtt.dtt_object = DTRACE_OBJ_DDEFS;
623 dtt.dtt_ctfp = DT_DYN_CTFP(dtp);
624 dtt.dtt_type = ctf_add_typedef(DT_DYN_CTFP(dtp),
625 CTF_ADD_ROOT, tag, DT_DYN_TYPE(dtp));
626
627 if (dtt.dtt_type == CTF_ERR ||
628 ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
629 xyerror(D_UNKNOWN, "cannot define type %s: %s\n",
630 tag, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
631 }
632 }
633
634 bzero(dnp, sizeof (dt_node_t));
635 dnp->dn_kind = DT_NODE_TYPE;
636
637 dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type);
638 dt_node_attr_assign(dnp, _dtrace_defattr);
639
640 return (dnp);
641 }
642
643 /*ARGSUSED*/
644 static int
645 dt_probe_desc(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp, void *arg)
646 {
647 if (((dtrace_probedesc_t *)arg)->dtpd_id == DTRACE_IDNONE) {
648 bcopy(pdp, arg, sizeof (dtrace_probedesc_t));
649 return (0);
650 }
651
652 return (1);
653 }
654
655 dt_probe_t *
656 dt_probe_info(dtrace_hdl_t *dtp,
657 const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip)
658 {
659 int m_is_glob = pdp->dtpd_mod[0] == '\0' || strisglob(pdp->dtpd_mod);
660 int f_is_glob = pdp->dtpd_func[0] == '\0' || strisglob(pdp->dtpd_func);
661 int n_is_glob = pdp->dtpd_name[0] == '\0' || strisglob(pdp->dtpd_name);
662
663 dt_probe_t *prp = NULL;
664 const dtrace_pattr_t *pap;
665 dt_provider_t *pvp;
666 dt_ident_t *idp;
667
668 /*
669 * Attempt to lookup the probe in our existing cache for this provider.
670 * If none is found and an explicit probe ID was specified, discover
671 * that specific probe and cache its description and arguments.
672 */
673 if ((pvp = dt_provider_lookup(dtp, pdp->dtpd_provider)) != NULL) {
674 size_t keylen = dt_probe_keylen(pdp);
675 char *key = dt_probe_key(pdp, alloca(keylen));
676
677 if ((idp = dt_idhash_lookup(pvp->pv_probes, key)) != NULL)
678 prp = idp->di_data;
679 else if (pdp->dtpd_id != DTRACE_IDNONE)
680 prp = dt_probe_discover(pvp, pdp);
681 }
682
683 /*
684 * If no probe was found in our cache, convert the caller's partial
685 * probe description into a fully-formed matching probe description by
686 * iterating over up to at most two probes that match 'pdp'. We then
687 * call dt_probe_discover() on the resulting probe identifier.
688 */
689 if (prp == NULL) {
690 dtrace_probedesc_t pd;
691 int m;
692
693 bzero(&pd, sizeof (pd));
694 pd.dtpd_id = DTRACE_IDNONE;
695
696 /*
697 * Call dtrace_probe_iter() to find matching probes. Our
698 * dt_probe_desc() callback will produce the following results:
699 *
700 * m < 0 dtrace_probe_iter() found zero matches (or failed).
701 * m > 0 dtrace_probe_iter() found more than one match.
702 * m = 0 dtrace_probe_iter() found exactly one match.
703 */
704 if ((m = dtrace_probe_iter(dtp, pdp, dt_probe_desc, &pd)) < 0)
705 return (NULL); /* dt_errno is set for us */
706
707 if ((pvp = dt_provider_lookup(dtp, pd.dtpd_provider)) == NULL)
708 return (NULL); /* dt_errno is set for us */
709
710 /*
711 * If more than one probe was matched, then do not report probe
712 * information if either of the following conditions is true:
713 *
714 * (a) The Arguments Data stability of the matched provider is
715 * less than Evolving.
716 *
717 * (b) Any description component that is at least Evolving is
718 * empty or is specified using a globbing expression.
719 *
720 * These conditions imply that providers that provide Evolving
721 * or better Arguments Data stability must guarantee that all
722 * probes with identical field names in a field of Evolving or
723 * better Name stability have identical argument signatures.
724 */
725 if (m > 0) {
726 if (pvp->pv_desc.dtvd_attr.dtpa_args.dtat_data <
727 DTRACE_STABILITY_EVOLVING) {
728 (void) dt_set_errno(dtp, EDT_UNSTABLE);
729 return (NULL);
730 }
731
732
733 if (pvp->pv_desc.dtvd_attr.dtpa_mod.dtat_name >=
734 DTRACE_STABILITY_EVOLVING && m_is_glob) {
735 (void) dt_set_errno(dtp, EDT_UNSTABLE);
736 return (NULL);
737 }
738
739 if (pvp->pv_desc.dtvd_attr.dtpa_func.dtat_name >=
740 DTRACE_STABILITY_EVOLVING && f_is_glob) {
741 (void) dt_set_errno(dtp, EDT_UNSTABLE);
742 return (NULL);
743 }
744
745 if (pvp->pv_desc.dtvd_attr.dtpa_name.dtat_name >=
746 DTRACE_STABILITY_EVOLVING && n_is_glob) {
747 (void) dt_set_errno(dtp, EDT_UNSTABLE);
748 return (NULL);
749 }
750 }
751
752 /*
753 * If we matched a probe exported by dtrace(7D), then discover
754 * the real attributes. Otherwise grab the static declaration.
755 */
756 if (pd.dtpd_id != DTRACE_IDNONE)
757 prp = dt_probe_discover(pvp, &pd);
758 else
759 prp = dt_probe_lookup(pvp, pd.dtpd_name);
760
761 if (prp == NULL)
762 return (NULL); /* dt_errno is set for us */
763 }
764
765 assert(pvp != NULL && prp != NULL);
766
767 /*
768 * Compute the probe description attributes by taking the minimum of
769 * the attributes of the specified fields. If no provider is specified
770 * or a glob pattern is used for the provider, use Unstable attributes.
771 */
772 if (pdp->dtpd_provider[0] == '\0' || strisglob(pdp->dtpd_provider))
773 pap = &_dtrace_prvdesc;
774 else
775 pap = &pvp->pv_desc.dtvd_attr;
776
777 pip->dtp_attr = pap->dtpa_provider;
778
779 if (!m_is_glob)
780 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_mod);
781 if (!f_is_glob)
782 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_func);
783 if (!n_is_glob)
784 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_name);
785
786 pip->dtp_arga = pap->dtpa_args;
787 pip->dtp_argv = prp->pr_argv;
788 pip->dtp_argc = prp->pr_argc;
789
790 return (prp);
791 }
792
793 int
794 dtrace_probe_info(dtrace_hdl_t *dtp,
795 const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip)
796 {
797 return (dt_probe_info(dtp, pdp, pip) != NULL ? 0 : -1);
798 }
799
800 /*ARGSUSED*/
801 static int
802 dt_probe_iter(dt_idhash_t *ihp, dt_ident_t *idp, dt_probe_iter_t *pit)
803 {
804 const dt_probe_t *prp = idp->di_data;
805
806 if (!dt_gmatch(prp->pr_name, pit->pit_pat))
807 return (0); /* continue on and examine next probe in hash */
808
809 (void) strlcpy(pit->pit_desc.dtpd_name, prp->pr_name, DTRACE_NAMELEN);
810 pit->pit_desc.dtpd_id = idp->di_id;
811 pit->pit_matches++;
812
813 return (pit->pit_func(pit->pit_hdl, &pit->pit_desc, pit->pit_arg));
814 }
815
816 int
817 dtrace_probe_iter(dtrace_hdl_t *dtp,
818 const dtrace_probedesc_t *pdp, dtrace_probe_f *func, void *arg)
819 {
820 const char *provider = pdp ? pdp->dtpd_provider : NULL;
821 dtrace_id_t id = DTRACE_IDNONE;
822
823 dtrace_probedesc_t pd;
824 dt_probe_iter_t pit;
825 int cmd, rv;
826
827 bzero(&pit, sizeof (pit));
828 pit.pit_hdl = dtp;
829 pit.pit_func = func;
830 pit.pit_arg = arg;
831 pit.pit_pat = pdp ? pdp->dtpd_name : NULL;
832
833 for (pit.pit_pvp = dt_list_next(&dtp->dt_provlist);
834 pit.pit_pvp != NULL; pit.pit_pvp = dt_list_next(pit.pit_pvp)) {
835
836 if (pit.pit_pvp->pv_flags & DT_PROVIDER_IMPL)
837 continue; /* we'll get these later using dt_ioctl() */
838
839 if (!dt_gmatch(pit.pit_pvp->pv_desc.dtvd_name, provider))
840 continue;
841
842 (void) strlcpy(pit.pit_desc.dtpd_provider,
843 pit.pit_pvp->pv_desc.dtvd_name, DTRACE_PROVNAMELEN);
844
845 if ((rv = dt_idhash_iter(pit.pit_pvp->pv_probes,
846 (dt_idhash_f *)dt_probe_iter, &pit)) != 0)
847 return (rv);
848 }
849
850 if (pdp != NULL)
851 cmd = DTRACEIOC_PROBEMATCH;
852 else
853 cmd = DTRACEIOC_PROBES;
854
855 for (;;) {
856 if (pdp != NULL)
857 bcopy(pdp, &pd, sizeof (pd));
858
859 pd.dtpd_id = id;
860
861 if (dt_ioctl(dtp, cmd, &pd) != 0)
862 break;
863 else if ((rv = func(dtp, &pd, arg)) != 0)
864 return (rv);
865
866 pit.pit_matches++;
867 id = pd.dtpd_id + 1;
868 }
869
870 switch (errno) {
871 case ESRCH:
872 case EBADF:
873 return (pit.pit_matches ? 0 : dt_set_errno(dtp, EDT_NOPROBE));
874 case EINVAL:
875 return (dt_set_errno(dtp, EDT_BADPGLOB));
876 default:
877 return (dt_set_errno(dtp, errno));
878 }
879 }