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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 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); 502 } 503 504 dt_free(dtp, prp->pr_mapping); 505 dt_free(dtp, prp->pr_argv); 506 dt_free(dtp, prp); 507 } 508 509 int 510 dt_probe_define(dt_provider_t *pvp, dt_probe_t *prp, 511 const char *fname, const char *rname, uint32_t offset) 512 { 513 dtrace_hdl_t *dtp = pvp->pv_hdl; 514 dt_probe_instance_t *pip; 515 516 assert(fname != NULL); 517 518 for (pip = prp->pr_inst; pip != NULL; pip = pip->pi_next) { 519 if (strcmp(pip->pi_fname, fname) == 0 && 520 ((rname == NULL && pip->pi_rname[0] == '\0') || 521 (rname != NULL && strcmp(pip->pi_rname, rname)) == 0)) 522 break; 523 } 524 525 if (pip == NULL) { 526 if ((pip = dt_zalloc(dtp, sizeof (*pip))) == NULL) 527 return (-1); 528 529 if ((pip->pi_offs = dt_alloc(dtp, sizeof (uint32_t))) == NULL) { 530 dt_free(dtp, pip); 531 return (-1); 532 } 533 534 (void) strlcpy(pip->pi_fname, fname, sizeof (pip->pi_fname)); 535 if (rname != NULL) { 536 if (strlen(rname) + 1 > sizeof (pip->pi_rname)) { 537 dt_free(dtp, pip->pi_offs); 538 dt_free(dtp, pip); 539 return (dt_set_errno(dtp, EDT_COMPILER)); 540 } 541 (void) strcpy(pip->pi_rname, rname); 542 } 543 pip->pi_noffs = 0; 544 pip->pi_maxoffs = 1; 545 pip->pi_next = prp->pr_inst; 546 547 prp->pr_inst = pip; 548 } 549 550 if (pip->pi_noffs == pip->pi_maxoffs) { 551 uint_t new_max = pip->pi_maxoffs * 2; 552 uint32_t *new_offs = dt_alloc(dtp, sizeof (uint32_t) * new_max); 553 554 if (new_offs == NULL) 555 return (-1); 556 557 bcopy(pip->pi_offs, new_offs, 558 sizeof (uint32_t) * pip->pi_maxoffs); 559 560 dt_free(dtp, pip->pi_offs); 561 pip->pi_maxoffs = new_max; 562 pip->pi_offs = new_offs; 563 } 564 565 dt_dprintf("defined probe %s:%s %s() +0x%x (%s)\n", 566 pvp->pv_desc.dtvd_name, prp->pr_ident->di_name, fname, offset, 567 rname != NULL ? rname : fname); 568 569 assert(pip->pi_noffs < pip->pi_maxoffs); 570 pip->pi_offs[pip->pi_noffs++] = offset; 571 572 return (0); 573 } 574 575 /* 576 * Lookup the dynamic translator type tag for the specified probe argument and 577 * assign the type to the specified node. If the type is not yet defined, add 578 * it to the "D" module's type container as a typedef for an unknown type. 579 */ 580 dt_node_t * 581 dt_probe_tag(dt_probe_t *prp, uint_t argn, dt_node_t *dnp) 582 { 583 dtrace_hdl_t *dtp = prp->pr_pvp->pv_hdl; 584 dtrace_typeinfo_t dtt; 585 size_t len; 586 char *tag; 587 588 len = snprintf(NULL, 0, "__dtrace_%s___%s_arg%u", 589 prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn); 590 591 tag = alloca(len + 1); 592 593 (void) snprintf(tag, len + 1, "__dtrace_%s___%s_arg%u", 594 prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn); 595 596 if (dtrace_lookup_by_type(dtp, DTRACE_OBJ_DDEFS, tag, &dtt) != 0) { 597 dtt.dtt_object = DTRACE_OBJ_DDEFS; 598 dtt.dtt_ctfp = DT_DYN_CTFP(dtp); 599 dtt.dtt_type = ctf_add_typedef(DT_DYN_CTFP(dtp), 600 CTF_ADD_ROOT, tag, DT_DYN_TYPE(dtp)); 601 602 if (dtt.dtt_type == CTF_ERR || 603 ctf_update(dtt.dtt_ctfp) == CTF_ERR) { 604 xyerror(D_UNKNOWN, "cannot define type %s: %s\n", 605 tag, ctf_errmsg(ctf_errno(dtt.dtt_ctfp))); 606 } 607 } 608 609 bzero(dnp, sizeof (dt_node_t)); 610 dnp->dn_kind = DT_NODE_TYPE; 611 612 dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type); 613 dt_node_attr_assign(dnp, _dtrace_defattr); 614 615 return (dnp); 616 } 617 618 /*ARGSUSED*/ 619 static int 620 dt_probe_desc(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp, void *arg) 621 { 622 if (((dtrace_probedesc_t *)arg)->dtpd_id == DTRACE_IDNONE) { 623 bcopy(pdp, arg, sizeof (dtrace_probedesc_t)); 624 return (0); 625 } 626 627 return (1); 628 } 629 630 dt_probe_t * 631 dt_probe_info(dtrace_hdl_t *dtp, 632 const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip) 633 { 634 int m_is_glob = pdp->dtpd_mod[0] == '\0' || strisglob(pdp->dtpd_mod); 635 int f_is_glob = pdp->dtpd_func[0] == '\0' || strisglob(pdp->dtpd_func); 636 int n_is_glob = pdp->dtpd_name[0] == '\0' || strisglob(pdp->dtpd_name); 637 638 dt_probe_t *prp = NULL; 639 const dtrace_pattr_t *pap; 640 dt_provider_t *pvp; 641 dt_ident_t *idp; 642 643 /* 644 * Attempt to lookup the probe in our existing cache for this provider. 645 * If none is found and an explicit probe ID was specified, discover 646 * that specific probe and cache its description and arguments. 647 */ 648 if ((pvp = dt_provider_lookup(dtp, pdp->dtpd_provider)) != NULL) { 649 size_t keylen = dt_probe_keylen(pdp); 650 char *key = dt_probe_key(pdp, alloca(keylen)); 651 652 if ((idp = dt_idhash_lookup(pvp->pv_probes, key)) != NULL) 653 prp = idp->di_data; 654 else if (pdp->dtpd_id != DTRACE_IDNONE) 655 prp = dt_probe_discover(pvp, pdp); 656 } 657 658 /* 659 * If no probe was found in our cache, convert the caller's partial 660 * probe description into a fully-formed matching probe description by 661 * iterating over up to at most two probes that match 'pdp'. We then 662 * call dt_probe_discover() on the resulting probe identifier. 663 */ 664 if (prp == NULL) { 665 dtrace_probedesc_t pd; 666 int m; 667 668 bzero(&pd, sizeof (pd)); 669 pd.dtpd_id = DTRACE_IDNONE; 670 671 /* 672 * Call dtrace_probe_iter() to find matching probes. Our 673 * dt_probe_desc() callback will produce the following results: 674 * 675 * m < 0 dtrace_probe_iter() found zero matches (or failed). 676 * m > 0 dtrace_probe_iter() found more than one match. 677 * m = 0 dtrace_probe_iter() found exactly one match. 678 */ 679 if ((m = dtrace_probe_iter(dtp, pdp, dt_probe_desc, &pd)) < 0) 680 return (NULL); /* dt_errno is set for us */ 681 682 if ((pvp = dt_provider_lookup(dtp, pd.dtpd_provider)) == NULL) 683 return (NULL); /* dt_errno is set for us */ 684 685 /* 686 * If more than one probe was matched, then do not report probe 687 * information if either of the following conditions is true: 688 * 689 * (a) The Arguments Data stability of the matched provider is 690 * less than Evolving. 691 * 692 * (b) Any description component that is at least Evolving is 693 * empty or is specified using a globbing expression. 694 * 695 * These conditions imply that providers that provide Evolving 696 * or better Arguments Data stability must guarantee that all 697 * probes with identical field names in a field of Evolving or 698 * better Name stability have identical argument signatures. 699 */ 700 if (m > 0) { 701 if (pvp->pv_desc.dtvd_attr.dtpa_args.dtat_data < 702 DTRACE_STABILITY_EVOLVING) { 703 (void) dt_set_errno(dtp, EDT_UNSTABLE); 704 return (NULL); 705 } 706 707 708 if (pvp->pv_desc.dtvd_attr.dtpa_mod.dtat_name >= 709 DTRACE_STABILITY_EVOLVING && m_is_glob) { 710 (void) dt_set_errno(dtp, EDT_UNSTABLE); 711 return (NULL); 712 } 713 714 if (pvp->pv_desc.dtvd_attr.dtpa_func.dtat_name >= 715 DTRACE_STABILITY_EVOLVING && f_is_glob) { 716 (void) dt_set_errno(dtp, EDT_UNSTABLE); 717 return (NULL); 718 } 719 720 if (pvp->pv_desc.dtvd_attr.dtpa_name.dtat_name >= 721 DTRACE_STABILITY_EVOLVING && n_is_glob) { 722 (void) dt_set_errno(dtp, EDT_UNSTABLE); 723 return (NULL); 724 } 725 } 726 727 /* 728 * If we matched a probe exported by dtrace(7D), then discover 729 * the real attributes. Otherwise grab the static declaration. 730 */ 731 if (pd.dtpd_id != DTRACE_IDNONE) 732 prp = dt_probe_discover(pvp, &pd); 733 else 734 prp = dt_probe_lookup(pvp, pd.dtpd_name); 735 736 if (prp == NULL) 737 return (NULL); /* dt_errno is set for us */ 738 } 739 740 assert(pvp != NULL && prp != NULL); 741 742 /* 743 * Compute the probe description attributes by taking the minimum of 744 * the attributes of the specified fields. If no provider is specified 745 * or a glob pattern is used for the provider, use Unstable attributes. 746 */ 747 if (pdp->dtpd_provider[0] == '\0' || strisglob(pdp->dtpd_provider)) 748 pap = &_dtrace_prvdesc; 749 else 750 pap = &pvp->pv_desc.dtvd_attr; 751 752 pip->dtp_attr = pap->dtpa_provider; 753 754 if (!m_is_glob) 755 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_mod); 756 if (!f_is_glob) 757 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_func); 758 if (!n_is_glob) 759 pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_name); 760 761 pip->dtp_arga = pap->dtpa_args; 762 pip->dtp_argv = prp->pr_argv; 763 pip->dtp_argc = prp->pr_argc; 764 765 return (prp); 766 } 767 768 int 769 dtrace_probe_info(dtrace_hdl_t *dtp, 770 const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip) 771 { 772 return (dt_probe_info(dtp, pdp, pip) != NULL ? 0 : -1); 773 } 774 775 /*ARGSUSED*/ 776 static int 777 dt_probe_iter(dt_idhash_t *ihp, dt_ident_t *idp, dt_probe_iter_t *pit) 778 { 779 const dt_probe_t *prp = idp->di_data; 780 781 if (!dt_gmatch(prp->pr_name, pit->pit_pat)) 782 return (0); /* continue on and examine next probe in hash */ 783 784 (void) strlcpy(pit->pit_desc.dtpd_name, prp->pr_name, DTRACE_NAMELEN); 785 pit->pit_desc.dtpd_id = idp->di_id; 786 pit->pit_matches++; 787 788 return (pit->pit_func(pit->pit_hdl, &pit->pit_desc, pit->pit_arg)); 789 } 790 791 int 792 dtrace_probe_iter(dtrace_hdl_t *dtp, 793 const dtrace_probedesc_t *pdp, dtrace_probe_f *func, void *arg) 794 { 795 const char *provider = pdp ? pdp->dtpd_provider : NULL; 796 dtrace_id_t id = DTRACE_IDNONE; 797 798 dtrace_probedesc_t pd; 799 dt_probe_iter_t pit; 800 int cmd, rv; 801 802 bzero(&pit, sizeof (pit)); 803 pit.pit_hdl = dtp; 804 pit.pit_func = func; 805 pit.pit_arg = arg; 806 pit.pit_pat = pdp ? pdp->dtpd_name : NULL; 807 808 for (pit.pit_pvp = dt_list_next(&dtp->dt_provlist); 809 pit.pit_pvp != NULL; pit.pit_pvp = dt_list_next(pit.pit_pvp)) { 810 811 if (pit.pit_pvp->pv_flags & DT_PROVIDER_IMPL) 812 continue; /* we'll get these later using dt_ioctl() */ 813 814 if (!dt_gmatch(pit.pit_pvp->pv_desc.dtvd_name, provider)) 815 continue; 816 817 (void) strlcpy(pit.pit_desc.dtpd_provider, 818 pit.pit_pvp->pv_desc.dtvd_name, DTRACE_PROVNAMELEN); 819 820 if ((rv = dt_idhash_iter(pit.pit_pvp->pv_probes, 821 (dt_idhash_f *)dt_probe_iter, &pit)) != 0) 822 return (rv); 823 } 824 825 if (pdp != NULL) 826 cmd = DTRACEIOC_PROBEMATCH; 827 else 828 cmd = DTRACEIOC_PROBES; 829 830 for (;;) { 831 if (pdp != NULL) 832 bcopy(pdp, &pd, sizeof (pd)); 833 834 pd.dtpd_id = id; 835 836 if (dt_ioctl(dtp, cmd, &pd) != 0) 837 break; 838 else if ((rv = func(dtp, &pd, arg)) != 0) 839 return (rv); 840 841 pit.pit_matches++; 842 id = pd.dtpd_id + 1; 843 } 844 845 switch (errno) { 846 case ESRCH: 847 case EBADF: 848 return (pit.pit_matches ? 0 : dt_set_errno(dtp, EDT_NOPROBE)); 849 case EINVAL: 850 return (dt_set_errno(dtp, EDT_BADPGLOB)); 851 default: 852 return (dt_set_errno(dtp, errno)); 853 } 854 } 855