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 2005 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/modctl.h> 30 #include <sys/dtrace.h> 31 #include <sys/kobj.h> 32 #include <sys/stat.h> 33 #include <sys/ddi.h> 34 #include <sys/sunddi.h> 35 #include <sys/conf.h> 36 37 #define FBT_PUSHL_EBP 0x55 38 #define FBT_MOVL_ESP_EBP0_V0 0x8b 39 #define FBT_MOVL_ESP_EBP1_V0 0xec 40 #define FBT_MOVL_ESP_EBP0_V1 0x89 41 #define FBT_MOVL_ESP_EBP1_V1 0xe5 42 #define FBT_REX_RSP_RBP 0x48 43 44 #define FBT_POPL_EBP 0x5d 45 #define FBT_RET 0xc3 46 #define FBT_RET_IMM16 0xc2 47 #define FBT_LEAVE 0xc9 48 49 #ifdef __amd64 50 #define FBT_PATCHVAL 0xcc 51 #else 52 #define FBT_PATCHVAL 0xf0 53 #endif 54 55 #define FBT_ENTRY "entry" 56 #define FBT_RETURN "return" 57 #define FBT_ADDR2NDX(addr) ((((uintptr_t)(addr)) >> 4) & fbt_probetab_mask) 58 #define FBT_PROBETAB_SIZE 0x8000 /* 32k entries -- 128K total */ 59 60 typedef struct fbt_probe { 61 struct fbt_probe *fbtp_hashnext; 62 uint8_t *fbtp_patchpoint; 63 int8_t fbtp_rval; 64 uint8_t fbtp_patchval; 65 uint8_t fbtp_savedval; 66 uintptr_t fbtp_roffset; 67 dtrace_id_t fbtp_id; 68 char *fbtp_name; 69 struct modctl *fbtp_ctl; 70 int fbtp_loadcnt; 71 int fbtp_symndx; 72 int fbtp_primary; 73 struct fbt_probe *fbtp_next; 74 } fbt_probe_t; 75 76 static dev_info_t *fbt_devi; 77 static dtrace_provider_id_t fbt_id; 78 static fbt_probe_t **fbt_probetab; 79 static int fbt_probetab_size; 80 static int fbt_probetab_mask; 81 static int fbt_verbose = 0; 82 83 static int 84 fbt_invop(uintptr_t addr, uintptr_t *stack, uintptr_t rval) 85 { 86 uintptr_t stack0, stack1, stack2, stack3, stack4; 87 fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 88 89 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 90 if ((uintptr_t)fbt->fbtp_patchpoint == addr) { 91 if (fbt->fbtp_roffset == 0) { 92 int i = 0; 93 /* 94 * When accessing the arguments on the stack, 95 * we must protect against accessing beyond 96 * the stack. We can safely set NOFAULT here 97 * -- we know that interrupts are already 98 * disabled. 99 */ 100 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 101 CPU->cpu_dtrace_caller = stack[i++]; 102 #ifdef __amd64 103 /* 104 * On amd64, stack[0] contains the dereferenced 105 * stack pointer, stack[1] contains savfp, 106 * stack[2] contains savpc. We want to step 107 * over these entries. 108 */ 109 i += 2; 110 #endif 111 stack0 = stack[i++]; 112 stack1 = stack[i++]; 113 stack2 = stack[i++]; 114 stack3 = stack[i++]; 115 stack4 = stack[i++]; 116 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | 117 CPU_DTRACE_BADADDR); 118 119 dtrace_probe(fbt->fbtp_id, stack0, stack1, 120 stack2, stack3, stack4); 121 122 CPU->cpu_dtrace_caller = NULL; 123 } else { 124 #ifdef __amd64 125 /* 126 * On amd64, we instrument the ret, not the 127 * leave. We therefore need to set the caller 128 * to assure that the top frame of a stack() 129 * action is correct. 130 */ 131 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 132 CPU->cpu_dtrace_caller = stack[0]; 133 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | 134 CPU_DTRACE_BADADDR); 135 #endif 136 137 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, 138 rval, 0, 0, 0); 139 CPU->cpu_dtrace_caller = NULL; 140 } 141 142 return (fbt->fbtp_rval); 143 } 144 } 145 146 return (0); 147 } 148 149 /*ARGSUSED*/ 150 static void 151 fbt_provide_module(void *arg, struct modctl *ctl) 152 { 153 struct module *mp = ctl->mod_mp; 154 char *str = mp->strings; 155 int nsyms = mp->nsyms; 156 Shdr *symhdr = mp->symhdr; 157 char *modname = ctl->mod_modname; 158 char *name; 159 fbt_probe_t *fbt, *retfbt; 160 size_t symsize; 161 int i, size; 162 163 /* 164 * Employees of dtrace and their families are ineligible. Void 165 * where prohibited. 166 */ 167 if (strcmp(modname, "dtrace") == 0) 168 return; 169 170 if (ctl->mod_requisites != NULL) { 171 struct modctl_list *list; 172 173 list = (struct modctl_list *)ctl->mod_requisites; 174 175 for (; list != NULL; list = list->modl_next) { 176 if (strcmp(list->modl_modp->mod_modname, "dtrace") == 0) 177 return; 178 } 179 } 180 181 /* 182 * KMDB is ineligible for instrumentation -- it may execute in 183 * any context, including probe context. 184 */ 185 if (strcmp(modname, "kmdbmod") == 0) 186 return; 187 188 if (str == NULL || symhdr == NULL || symhdr->sh_addr == NULL) { 189 /* 190 * If this module doesn't (yet) have its string or symbol 191 * table allocated, clear out. 192 */ 193 return; 194 } 195 196 symsize = symhdr->sh_entsize; 197 198 if (mp->fbt_nentries) { 199 /* 200 * This module has some FBT entries allocated; we're afraid 201 * to screw with it. 202 */ 203 return; 204 } 205 206 for (i = 1; i < nsyms; i++) { 207 uint8_t *instr, *limit; 208 Sym *sym = (Sym *)(symhdr->sh_addr + i * symsize); 209 210 if (ELF_ST_TYPE(sym->st_info) != STT_FUNC) 211 continue; 212 213 /* 214 * Weak symbols are not candidates. This could be made to 215 * work (where weak functions and their underlying function 216 * appear as two disjoint probes), but it's not simple. 217 */ 218 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) 219 continue; 220 221 name = str + sym->st_name; 222 223 if (strstr(name, "dtrace_") == name && 224 strstr(name, "dtrace_safe_") != name) { 225 /* 226 * Anything beginning with "dtrace_" may be called 227 * from probe context unless it explitly indicates 228 * that it won't be called from probe context by 229 * using the prefix "dtrace_safe_". 230 */ 231 continue; 232 } 233 234 if (strstr(name, "kdi_") == name) { 235 /* 236 * Anything beginning with "kdi_" is a part of the 237 * kernel debugger interface and may be called in 238 * arbitrary context -- including probe context. 239 */ 240 continue; 241 } 242 243 /* 244 * Due to 4524008, _init and _fini may have a bloated st_size. 245 * While this bug was fixed quite some time ago, old drivers 246 * may be lurking. We need to develop a better solution to 247 * this problem, such that correct _init and _fini functions 248 * (the vast majority) may be correctly traced. One solution 249 * may be to scan through the entire symbol table to see if 250 * any symbol overlaps with _init. If none does, set a bit in 251 * the module structure that this module has correct _init and 252 * _fini sizes. This will cause some pain the first time a 253 * module is scanned, but at least it would be O(N) instead of 254 * O(N log N)... 255 */ 256 if (strcmp(name, "_init") == 0) 257 continue; 258 259 if (strcmp(name, "_fini") == 0) 260 continue; 261 262 /* 263 * In order to be eligible, the function must begin with the 264 * following sequence: 265 * 266 * pushl %esp 267 * movl %esp, %ebp 268 * 269 * Note that there are two variants of encodings that generate 270 * the movl; we must check for both. For 64-bit, we would 271 * normally insist that a function begin with the following 272 * sequence: 273 * 274 * pushq %rbp 275 * movq %rsp, %rbp 276 * 277 * However, the compiler for 64-bit often splits these two 278 * instructions -- and the first instruction in the function 279 * is often not the pushq. As a result, on 64-bit we look 280 * for any "pushq %rbp" in the function and we instrument 281 * this with a breakpoint instruction. 282 */ 283 instr = (uint8_t *)sym->st_value; 284 limit = (uint8_t *)(sym->st_value + sym->st_size); 285 286 #ifdef __amd64 287 while (instr < limit) { 288 if (*instr == FBT_PUSHL_EBP) 289 break; 290 291 if ((size = dtrace_instr_size(instr)) <= 0) 292 break; 293 294 instr += size; 295 } 296 297 if (instr >= limit || *instr != FBT_PUSHL_EBP) { 298 /* 299 * We either don't save the frame pointer in this 300 * function, or we ran into some disassembly 301 * screw-up. Either way, we bail. 302 */ 303 continue; 304 } 305 #else 306 if (instr[0] != FBT_PUSHL_EBP) 307 continue; 308 309 if (!(instr[1] == FBT_MOVL_ESP_EBP0_V0 && 310 instr[2] == FBT_MOVL_ESP_EBP1_V0) && 311 !(instr[1] == FBT_MOVL_ESP_EBP0_V1 && 312 instr[2] == FBT_MOVL_ESP_EBP1_V1)) 313 continue; 314 #endif 315 316 fbt = kmem_zalloc(sizeof (fbt_probe_t), KM_SLEEP); 317 fbt->fbtp_name = name; 318 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 319 name, FBT_ENTRY, 3, fbt); 320 fbt->fbtp_patchpoint = instr; 321 fbt->fbtp_ctl = ctl; 322 fbt->fbtp_loadcnt = ctl->mod_loadcnt; 323 fbt->fbtp_rval = DTRACE_INVOP_PUSHL_EBP; 324 fbt->fbtp_savedval = *instr; 325 fbt->fbtp_patchval = FBT_PATCHVAL; 326 327 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 328 fbt->fbtp_symndx = i; 329 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 330 331 mp->fbt_nentries++; 332 333 retfbt = NULL; 334 again: 335 if (instr >= limit) 336 continue; 337 338 /* 339 * If this disassembly fails, then we've likely walked off into 340 * a jump table or some other unsuitable area. Bail out of the 341 * disassembly now. 342 */ 343 if ((size = dtrace_instr_size(instr)) <= 0) 344 continue; 345 346 #ifdef __amd64 347 /* 348 * We only instrument "ret" on amd64 -- we don't yet instrument 349 * ret imm16, largely because the compiler doesn't seem to 350 * (yet) emit them in the kernel... 351 */ 352 if (*instr != FBT_RET) { 353 instr += size; 354 goto again; 355 } 356 #else 357 if (!(size == 1 && 358 (*instr == FBT_POPL_EBP || *instr == FBT_LEAVE) && 359 (*(instr + 1) == FBT_RET || 360 *(instr + 1) == FBT_RET_IMM16))) { 361 instr += size; 362 goto again; 363 } 364 #endif 365 366 /* 367 * We have a winner! 368 */ 369 fbt = kmem_zalloc(sizeof (fbt_probe_t), KM_SLEEP); 370 fbt->fbtp_name = name; 371 372 if (retfbt == NULL) { 373 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 374 name, FBT_RETURN, 3, fbt); 375 } else { 376 retfbt->fbtp_next = fbt; 377 fbt->fbtp_id = retfbt->fbtp_id; 378 } 379 380 retfbt = fbt; 381 fbt->fbtp_patchpoint = instr; 382 fbt->fbtp_ctl = ctl; 383 fbt->fbtp_loadcnt = ctl->mod_loadcnt; 384 385 #ifndef __amd64 386 if (*instr == FBT_POPL_EBP) { 387 fbt->fbtp_rval = DTRACE_INVOP_POPL_EBP; 388 } else { 389 ASSERT(*instr == FBT_LEAVE); 390 fbt->fbtp_rval = DTRACE_INVOP_LEAVE; 391 } 392 fbt->fbtp_roffset = 393 (uintptr_t)(instr - (uint8_t *)sym->st_value) + 1; 394 395 #else 396 ASSERT(*instr == FBT_RET); 397 fbt->fbtp_rval = DTRACE_INVOP_RET; 398 fbt->fbtp_roffset = 399 (uintptr_t)(instr - (uint8_t *)sym->st_value); 400 #endif 401 402 fbt->fbtp_savedval = *instr; 403 fbt->fbtp_patchval = FBT_PATCHVAL; 404 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 405 fbt->fbtp_symndx = i; 406 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 407 408 mp->fbt_nentries++; 409 410 instr += size; 411 goto again; 412 } 413 } 414 415 /*ARGSUSED*/ 416 static void 417 fbt_destroy(void *arg, dtrace_id_t id, void *parg) 418 { 419 fbt_probe_t *fbt = parg, *next, *hash, *last; 420 struct modctl *ctl = fbt->fbtp_ctl; 421 int ndx; 422 423 do { 424 if (ctl != NULL && ctl->mod_loadcnt == fbt->fbtp_loadcnt) { 425 if ((ctl->mod_loadcnt == fbt->fbtp_loadcnt && 426 ctl->mod_loaded)) { 427 ((struct module *) 428 (ctl->mod_mp))->fbt_nentries--; 429 } 430 } 431 432 /* 433 * Now we need to remove this probe from the fbt_probetab. 434 */ 435 ndx = FBT_ADDR2NDX(fbt->fbtp_patchpoint); 436 last = NULL; 437 hash = fbt_probetab[ndx]; 438 439 while (hash != fbt) { 440 ASSERT(hash != NULL); 441 last = hash; 442 hash = hash->fbtp_hashnext; 443 } 444 445 if (last != NULL) { 446 last->fbtp_hashnext = fbt->fbtp_hashnext; 447 } else { 448 fbt_probetab[ndx] = fbt->fbtp_hashnext; 449 } 450 451 next = fbt->fbtp_next; 452 kmem_free(fbt, sizeof (fbt_probe_t)); 453 454 fbt = next; 455 } while (fbt != NULL); 456 } 457 458 /*ARGSUSED*/ 459 static void 460 fbt_enable(void *arg, dtrace_id_t id, void *parg) 461 { 462 fbt_probe_t *fbt = parg; 463 struct modctl *ctl = fbt->fbtp_ctl; 464 465 ctl->mod_nenabled++; 466 467 if (!ctl->mod_loaded) { 468 if (fbt_verbose) { 469 cmn_err(CE_NOTE, "fbt is failing for probe %s " 470 "(module %s unloaded)", 471 fbt->fbtp_name, ctl->mod_modname); 472 } 473 474 return; 475 } 476 477 /* 478 * Now check that our modctl has the expected load count. If it 479 * doesn't, this module must have been unloaded and reloaded -- and 480 * we're not going to touch it. 481 */ 482 if (ctl->mod_loadcnt != fbt->fbtp_loadcnt) { 483 if (fbt_verbose) { 484 cmn_err(CE_NOTE, "fbt is failing for probe %s " 485 "(module %s reloaded)", 486 fbt->fbtp_name, ctl->mod_modname); 487 } 488 489 return; 490 } 491 492 for (; fbt != NULL; fbt = fbt->fbtp_next) 493 *fbt->fbtp_patchpoint = fbt->fbtp_patchval; 494 } 495 496 /*ARGSUSED*/ 497 static void 498 fbt_disable(void *arg, dtrace_id_t id, void *parg) 499 { 500 fbt_probe_t *fbt = parg; 501 struct modctl *ctl = fbt->fbtp_ctl; 502 503 ASSERT(ctl->mod_nenabled > 0); 504 ctl->mod_nenabled--; 505 506 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 507 return; 508 509 for (; fbt != NULL; fbt = fbt->fbtp_next) 510 *fbt->fbtp_patchpoint = fbt->fbtp_savedval; 511 } 512 513 /*ARGSUSED*/ 514 static void 515 fbt_suspend(void *arg, dtrace_id_t id, void *parg) 516 { 517 fbt_probe_t *fbt = parg; 518 struct modctl *ctl = fbt->fbtp_ctl; 519 520 ASSERT(ctl->mod_nenabled > 0); 521 522 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 523 return; 524 525 for (; fbt != NULL; fbt = fbt->fbtp_next) 526 *fbt->fbtp_patchpoint = fbt->fbtp_savedval; 527 } 528 529 /*ARGSUSED*/ 530 static void 531 fbt_resume(void *arg, dtrace_id_t id, void *parg) 532 { 533 fbt_probe_t *fbt = parg; 534 struct modctl *ctl = fbt->fbtp_ctl; 535 536 ASSERT(ctl->mod_nenabled > 0); 537 538 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 539 return; 540 541 for (; fbt != NULL; fbt = fbt->fbtp_next) 542 *fbt->fbtp_patchpoint = fbt->fbtp_patchval; 543 } 544 545 /*ARGSUSED*/ 546 static void 547 fbt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc) 548 { 549 fbt_probe_t *fbt = parg; 550 struct modctl *ctl = fbt->fbtp_ctl; 551 struct module *mp = ctl->mod_mp; 552 ctf_file_t *fp = NULL, *pfp; 553 ctf_funcinfo_t f; 554 int error; 555 ctf_id_t argv[32], type; 556 int argc = sizeof (argv) / sizeof (ctf_id_t); 557 const char *parent; 558 559 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 560 goto err; 561 562 if (fbt->fbtp_roffset != 0 && desc->dtargd_ndx == 0) { 563 (void) strcpy(desc->dtargd_native, "int"); 564 return; 565 } 566 567 if ((fp = ctf_modopen(mp, &error)) == NULL) { 568 /* 569 * We have no CTF information for this module -- and therefore 570 * no args[] information. 571 */ 572 goto err; 573 } 574 575 /* 576 * If we have a parent container, we must manually import it. 577 */ 578 if ((parent = ctf_parent_name(fp)) != NULL) { 579 struct modctl *mod; 580 581 /* 582 * We must iterate over all modules to find the module that 583 * is our parent. 584 */ 585 for (mod = &modules; mod != NULL; mod = mod->mod_next) { 586 if (strcmp(mod->mod_filename, parent) == 0) 587 break; 588 } 589 590 if (mod == NULL) 591 goto err; 592 593 if ((pfp = ctf_modopen(mod->mod_mp, &error)) == NULL) 594 goto err; 595 596 if (ctf_import(fp, pfp) != 0) { 597 ctf_close(pfp); 598 goto err; 599 } 600 601 ctf_close(pfp); 602 } 603 604 if (ctf_func_info(fp, fbt->fbtp_symndx, &f) == CTF_ERR) 605 goto err; 606 607 if (fbt->fbtp_roffset != 0) { 608 if (desc->dtargd_ndx > 1) 609 goto err; 610 611 ASSERT(desc->dtargd_ndx == 1); 612 type = f.ctc_return; 613 } else { 614 if (desc->dtargd_ndx + 1 > f.ctc_argc) 615 goto err; 616 617 if (ctf_func_args(fp, fbt->fbtp_symndx, argc, argv) == CTF_ERR) 618 goto err; 619 620 type = argv[desc->dtargd_ndx]; 621 } 622 623 if (ctf_type_name(fp, type, desc->dtargd_native, 624 DTRACE_ARGTYPELEN) != NULL) { 625 ctf_close(fp); 626 return; 627 } 628 err: 629 if (fp != NULL) 630 ctf_close(fp); 631 632 desc->dtargd_ndx = DTRACE_ARGNONE; 633 } 634 635 static dtrace_pattr_t fbt_attr = { 636 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA }, 637 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 638 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 639 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA }, 640 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA }, 641 }; 642 643 static dtrace_pops_t fbt_pops = { 644 NULL, 645 fbt_provide_module, 646 fbt_enable, 647 fbt_disable, 648 fbt_suspend, 649 fbt_resume, 650 fbt_getargdesc, 651 NULL, 652 NULL, 653 fbt_destroy 654 }; 655 656 static void 657 fbt_cleanup(dev_info_t *devi) 658 { 659 dtrace_invop_remove(fbt_invop); 660 ddi_remove_minor_node(devi, NULL); 661 kmem_free(fbt_probetab, fbt_probetab_size * sizeof (fbt_probe_t *)); 662 fbt_probetab = NULL; 663 fbt_probetab_mask = 0; 664 } 665 666 static int 667 fbt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 668 { 669 switch (cmd) { 670 case DDI_ATTACH: 671 break; 672 case DDI_RESUME: 673 return (DDI_SUCCESS); 674 default: 675 return (DDI_FAILURE); 676 } 677 678 if (fbt_probetab_size == 0) 679 fbt_probetab_size = FBT_PROBETAB_SIZE; 680 681 fbt_probetab_mask = fbt_probetab_size - 1; 682 fbt_probetab = 683 kmem_zalloc(fbt_probetab_size * sizeof (fbt_probe_t *), KM_SLEEP); 684 685 dtrace_invop_add(fbt_invop); 686 687 if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0, 688 DDI_PSEUDO, NULL) == DDI_FAILURE || 689 dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, 0, 690 &fbt_pops, NULL, &fbt_id) != 0) { 691 fbt_cleanup(devi); 692 return (DDI_FAILURE); 693 } 694 695 ddi_report_dev(devi); 696 fbt_devi = devi; 697 698 return (DDI_SUCCESS); 699 } 700 701 static int 702 fbt_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 703 { 704 switch (cmd) { 705 case DDI_DETACH: 706 break; 707 case DDI_SUSPEND: 708 return (DDI_SUCCESS); 709 default: 710 return (DDI_FAILURE); 711 } 712 713 if (dtrace_unregister(fbt_id) != 0) 714 return (DDI_FAILURE); 715 716 fbt_cleanup(devi); 717 718 return (DDI_SUCCESS); 719 } 720 721 /*ARGSUSED*/ 722 static int 723 fbt_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 724 { 725 int error; 726 727 switch (infocmd) { 728 case DDI_INFO_DEVT2DEVINFO: 729 *result = (void *)fbt_devi; 730 error = DDI_SUCCESS; 731 break; 732 case DDI_INFO_DEVT2INSTANCE: 733 *result = (void *)0; 734 error = DDI_SUCCESS; 735 break; 736 default: 737 error = DDI_FAILURE; 738 } 739 return (error); 740 } 741 742 /*ARGSUSED*/ 743 static int 744 fbt_open(dev_t *devp, int flag, int otyp, cred_t *cred_p) 745 { 746 return (0); 747 } 748 749 static struct cb_ops fbt_cb_ops = { 750 fbt_open, /* open */ 751 nodev, /* close */ 752 nulldev, /* strategy */ 753 nulldev, /* print */ 754 nodev, /* dump */ 755 nodev, /* read */ 756 nodev, /* write */ 757 nodev, /* ioctl */ 758 nodev, /* devmap */ 759 nodev, /* mmap */ 760 nodev, /* segmap */ 761 nochpoll, /* poll */ 762 ddi_prop_op, /* cb_prop_op */ 763 0, /* streamtab */ 764 D_NEW | D_MP /* Driver compatibility flag */ 765 }; 766 767 static struct dev_ops fbt_ops = { 768 DEVO_REV, /* devo_rev */ 769 0, /* refcnt */ 770 fbt_info, /* get_dev_info */ 771 nulldev, /* identify */ 772 nulldev, /* probe */ 773 fbt_attach, /* attach */ 774 fbt_detach, /* detach */ 775 nodev, /* reset */ 776 &fbt_cb_ops, /* driver operations */ 777 NULL, /* bus operations */ 778 nodev /* dev power */ 779 }; 780 781 /* 782 * Module linkage information for the kernel. 783 */ 784 static struct modldrv modldrv = { 785 &mod_driverops, /* module type (this is a pseudo driver) */ 786 "Function Boundary Tracing", /* name of module */ 787 &fbt_ops, /* driver ops */ 788 }; 789 790 static struct modlinkage modlinkage = { 791 MODREV_1, 792 (void *)&modldrv, 793 NULL 794 }; 795 796 int 797 _init(void) 798 { 799 return (mod_install(&modlinkage)); 800 } 801 802 int 803 _info(struct modinfo *modinfop) 804 { 805 return (mod_info(&modlinkage, modinfop)); 806 } 807 808 int 809 _fini(void) 810 { 811 return (mod_remove(&modlinkage)); 812 } 813