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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/modctl.h> 29 #include <sys/dtrace.h> 30 #include <sys/kobj.h> 31 #include <sys/stat.h> 32 #include <sys/ddi.h> 33 #include <sys/sunddi.h> 34 #include <sys/conf.h> 35 36 #define FBT_PUSHL_EBP 0x55 37 #define FBT_MOVL_ESP_EBP0_V0 0x8b 38 #define FBT_MOVL_ESP_EBP1_V0 0xec 39 #define FBT_MOVL_ESP_EBP0_V1 0x89 40 #define FBT_MOVL_ESP_EBP1_V1 0xe5 41 #define FBT_REX_RSP_RBP 0x48 42 43 #define FBT_POPL_EBP 0x5d 44 #define FBT_RET 0xc3 45 #define FBT_RET_IMM16 0xc2 46 #define FBT_LEAVE 0xc9 47 48 #ifdef __amd64 49 #define FBT_PATCHVAL 0xcc 50 #else 51 #define FBT_PATCHVAL 0xf0 52 #endif 53 54 #define FBT_ENTRY "entry" 55 #define FBT_RETURN "return" 56 #define FBT_ADDR2NDX(addr) ((((uintptr_t)(addr)) >> 4) & fbt_probetab_mask) 57 #define FBT_PROBETAB_SIZE 0x8000 /* 32k entries -- 128K total */ 58 59 typedef struct fbt_probe { 60 struct fbt_probe *fbtp_hashnext; 61 uint8_t *fbtp_patchpoint; 62 int8_t fbtp_rval; 63 uint8_t fbtp_patchval; 64 uint8_t fbtp_savedval; 65 uintptr_t fbtp_roffset; 66 dtrace_id_t fbtp_id; 67 char *fbtp_name; 68 struct modctl *fbtp_ctl; 69 int fbtp_loadcnt; 70 int fbtp_symndx; 71 int fbtp_primary; 72 struct fbt_probe *fbtp_next; 73 } fbt_probe_t; 74 75 static dev_info_t *fbt_devi; 76 static dtrace_provider_id_t fbt_id; 77 static fbt_probe_t **fbt_probetab; 78 static int fbt_probetab_size; 79 static int fbt_probetab_mask; 80 static int fbt_verbose = 0; 81 82 static int 83 fbt_invop(uintptr_t addr, uintptr_t *stack, uintptr_t rval) 84 { 85 uintptr_t stack0, stack1, stack2, stack3, stack4; 86 fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)]; 87 88 for (; fbt != NULL; fbt = fbt->fbtp_hashnext) { 89 if ((uintptr_t)fbt->fbtp_patchpoint == addr) { 90 if (fbt->fbtp_roffset == 0) { 91 int i = 0; 92 /* 93 * When accessing the arguments on the stack, 94 * we must protect against accessing beyond 95 * the stack. We can safely set NOFAULT here 96 * -- we know that interrupts are already 97 * disabled. 98 */ 99 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 100 CPU->cpu_dtrace_caller = stack[i++]; 101 #ifdef __amd64 102 /* 103 * On amd64, stack[0] contains the dereferenced 104 * stack pointer, stack[1] contains savfp, 105 * stack[2] contains savpc. We want to step 106 * over these entries. 107 */ 108 i += 2; 109 #endif 110 stack0 = stack[i++]; 111 stack1 = stack[i++]; 112 stack2 = stack[i++]; 113 stack3 = stack[i++]; 114 stack4 = stack[i++]; 115 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | 116 CPU_DTRACE_BADADDR); 117 118 dtrace_probe(fbt->fbtp_id, stack0, stack1, 119 stack2, stack3, stack4); 120 121 CPU->cpu_dtrace_caller = NULL; 122 } else { 123 #ifdef __amd64 124 /* 125 * On amd64, we instrument the ret, not the 126 * leave. We therefore need to set the caller 127 * to assure that the top frame of a stack() 128 * action is correct. 129 */ 130 DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 131 CPU->cpu_dtrace_caller = stack[0]; 132 DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | 133 CPU_DTRACE_BADADDR); 134 #endif 135 136 dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, 137 rval, 0, 0, 0); 138 CPU->cpu_dtrace_caller = NULL; 139 } 140 141 return (fbt->fbtp_rval); 142 } 143 } 144 145 return (0); 146 } 147 148 /*ARGSUSED*/ 149 static void 150 fbt_provide_module(void *arg, struct modctl *ctl) 151 { 152 struct module *mp = ctl->mod_mp; 153 char *str = mp->strings; 154 int nsyms = mp->nsyms; 155 Shdr *symhdr = mp->symhdr; 156 char *modname = ctl->mod_modname; 157 char *name; 158 fbt_probe_t *fbt, *retfbt; 159 size_t symsize; 160 int i, size; 161 162 /* 163 * Employees of dtrace and their families are ineligible. Void 164 * where prohibited. 165 */ 166 if (strcmp(modname, "dtrace") == 0) 167 return; 168 169 if (ctl->mod_requisites != NULL) { 170 struct modctl_list *list; 171 172 list = (struct modctl_list *)ctl->mod_requisites; 173 174 for (; list != NULL; list = list->modl_next) { 175 if (strcmp(list->modl_modp->mod_modname, "dtrace") == 0) 176 return; 177 } 178 } 179 180 /* 181 * KMDB is ineligible for instrumentation -- it may execute in 182 * any context, including probe context. 183 */ 184 if (strcmp(modname, "kmdbmod") == 0) 185 return; 186 187 if (str == NULL || symhdr == NULL || symhdr->sh_addr == NULL) { 188 /* 189 * If this module doesn't (yet) have its string or symbol 190 * table allocated, clear out. 191 */ 192 return; 193 } 194 195 symsize = symhdr->sh_entsize; 196 197 if (mp->fbt_nentries) { 198 /* 199 * This module has some FBT entries allocated; we're afraid 200 * to screw with it. 201 */ 202 return; 203 } 204 205 for (i = 1; i < nsyms; i++) { 206 uint8_t *instr, *limit; 207 Sym *sym = (Sym *)(symhdr->sh_addr + i * symsize); 208 #ifdef __amd64 209 int j; 210 #endif 211 212 if (ELF_ST_TYPE(sym->st_info) != STT_FUNC) 213 continue; 214 215 /* 216 * Weak symbols are not candidates. This could be made to 217 * work (where weak functions and their underlying function 218 * appear as two disjoint probes), but it's not simple. 219 */ 220 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) 221 continue; 222 223 name = str + sym->st_name; 224 225 if (strstr(name, "dtrace_") == name && 226 strstr(name, "dtrace_safe_") != name) { 227 /* 228 * Anything beginning with "dtrace_" may be called 229 * from probe context unless it explitly indicates 230 * that it won't be called from probe context by 231 * using the prefix "dtrace_safe_". 232 */ 233 continue; 234 } 235 236 if (strstr(name, "kdi_") == name || 237 strstr(name, "_kdi_") != NULL) { 238 /* 239 * Any function name beginning with "kdi_" or 240 * containing the string "_kdi_" is a part of the 241 * kernel debugger interface and may be called in 242 * arbitrary context -- including probe context. 243 */ 244 continue; 245 } 246 247 /* 248 * Due to 4524008, _init and _fini may have a bloated st_size. 249 * While this bug was fixed quite some time ago, old drivers 250 * may be lurking. We need to develop a better solution to 251 * this problem, such that correct _init and _fini functions 252 * (the vast majority) may be correctly traced. One solution 253 * may be to scan through the entire symbol table to see if 254 * any symbol overlaps with _init. If none does, set a bit in 255 * the module structure that this module has correct _init and 256 * _fini sizes. This will cause some pain the first time a 257 * module is scanned, but at least it would be O(N) instead of 258 * O(N log N)... 259 */ 260 if (strcmp(name, "_init") == 0) 261 continue; 262 263 if (strcmp(name, "_fini") == 0) 264 continue; 265 266 /* 267 * In order to be eligible, the function must begin with the 268 * following sequence: 269 * 270 * pushl %esp 271 * movl %esp, %ebp 272 * 273 * Note that there are two variants of encodings that generate 274 * the movl; we must check for both. For 64-bit, we would 275 * normally insist that a function begin with the following 276 * sequence: 277 * 278 * pushq %rbp 279 * movq %rsp, %rbp 280 * 281 * However, the compiler for 64-bit often splits these two 282 * instructions -- and the first instruction in the function 283 * is often not the pushq. As a result, on 64-bit we look 284 * for any "pushq %rbp" in the function and we instrument 285 * this with a breakpoint instruction. 286 */ 287 instr = (uint8_t *)sym->st_value; 288 limit = (uint8_t *)(sym->st_value + sym->st_size); 289 290 #ifdef __amd64 291 while (instr < limit) { 292 if (*instr == FBT_PUSHL_EBP) 293 break; 294 295 if ((size = dtrace_instr_size(instr)) <= 0) 296 break; 297 298 instr += size; 299 } 300 301 if (instr >= limit || *instr != FBT_PUSHL_EBP) { 302 /* 303 * We either don't save the frame pointer in this 304 * function, or we ran into some disassembly 305 * screw-up. Either way, we bail. 306 */ 307 continue; 308 } 309 #else 310 if (instr[0] != FBT_PUSHL_EBP) 311 continue; 312 313 if (!(instr[1] == FBT_MOVL_ESP_EBP0_V0 && 314 instr[2] == FBT_MOVL_ESP_EBP1_V0) && 315 !(instr[1] == FBT_MOVL_ESP_EBP0_V1 && 316 instr[2] == FBT_MOVL_ESP_EBP1_V1)) 317 continue; 318 #endif 319 320 fbt = kmem_zalloc(sizeof (fbt_probe_t), KM_SLEEP); 321 fbt->fbtp_name = name; 322 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 323 name, FBT_ENTRY, 3, fbt); 324 fbt->fbtp_patchpoint = instr; 325 fbt->fbtp_ctl = ctl; 326 fbt->fbtp_loadcnt = ctl->mod_loadcnt; 327 fbt->fbtp_rval = DTRACE_INVOP_PUSHL_EBP; 328 fbt->fbtp_savedval = *instr; 329 fbt->fbtp_patchval = FBT_PATCHVAL; 330 331 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 332 fbt->fbtp_symndx = i; 333 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 334 335 mp->fbt_nentries++; 336 337 retfbt = NULL; 338 again: 339 if (instr >= limit) 340 continue; 341 342 /* 343 * If this disassembly fails, then we've likely walked off into 344 * a jump table or some other unsuitable area. Bail out of the 345 * disassembly now. 346 */ 347 if ((size = dtrace_instr_size(instr)) <= 0) 348 continue; 349 350 #ifdef __amd64 351 /* 352 * We only instrument "ret" on amd64 -- we don't yet instrument 353 * ret imm16, largely because the compiler doesn't seem to 354 * (yet) emit them in the kernel... 355 */ 356 if (*instr != FBT_RET) { 357 instr += size; 358 goto again; 359 } 360 361 /* 362 * Because we are only looking for a one-byte marker here, 363 * there is an increased likelihood of erroneously interpreting 364 * a jump table to be an instrumentable instruction. We 365 * obviously want to avoid that, so we resort to some heuristic 366 * sleeze: we'll treat this instruction as being contained 367 * within a pointer, and see if that pointer points to within 368 * the body of the function. If it does, we refuse to 369 * instrument it. 370 */ 371 for (j = 0; j < sizeof (uintptr_t); j++) { 372 uintptr_t check = (uintptr_t)instr - j; 373 uint8_t *ptr; 374 375 if (check < sym->st_value) 376 break; 377 378 if (check + sizeof (uintptr_t) > (uintptr_t)limit) 379 continue; 380 381 ptr = *(uint8_t **)check; 382 383 if (ptr >= (uint8_t *)sym->st_value && ptr < limit) { 384 instr += size; 385 goto again; 386 } 387 } 388 #else 389 if (!(size == 1 && 390 (*instr == FBT_POPL_EBP || *instr == FBT_LEAVE) && 391 (*(instr + 1) == FBT_RET || 392 *(instr + 1) == FBT_RET_IMM16))) { 393 instr += size; 394 goto again; 395 } 396 #endif 397 398 /* 399 * We have a winner! 400 */ 401 fbt = kmem_zalloc(sizeof (fbt_probe_t), KM_SLEEP); 402 fbt->fbtp_name = name; 403 404 if (retfbt == NULL) { 405 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname, 406 name, FBT_RETURN, 3, fbt); 407 } else { 408 retfbt->fbtp_next = fbt; 409 fbt->fbtp_id = retfbt->fbtp_id; 410 } 411 412 retfbt = fbt; 413 fbt->fbtp_patchpoint = instr; 414 fbt->fbtp_ctl = ctl; 415 fbt->fbtp_loadcnt = ctl->mod_loadcnt; 416 417 #ifndef __amd64 418 if (*instr == FBT_POPL_EBP) { 419 fbt->fbtp_rval = DTRACE_INVOP_POPL_EBP; 420 } else { 421 ASSERT(*instr == FBT_LEAVE); 422 fbt->fbtp_rval = DTRACE_INVOP_LEAVE; 423 } 424 fbt->fbtp_roffset = 425 (uintptr_t)(instr - (uint8_t *)sym->st_value) + 1; 426 427 #else 428 ASSERT(*instr == FBT_RET); 429 fbt->fbtp_rval = DTRACE_INVOP_RET; 430 fbt->fbtp_roffset = 431 (uintptr_t)(instr - (uint8_t *)sym->st_value); 432 #endif 433 434 fbt->fbtp_savedval = *instr; 435 fbt->fbtp_patchval = FBT_PATCHVAL; 436 fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)]; 437 fbt->fbtp_symndx = i; 438 fbt_probetab[FBT_ADDR2NDX(instr)] = fbt; 439 440 mp->fbt_nentries++; 441 442 instr += size; 443 goto again; 444 } 445 } 446 447 /*ARGSUSED*/ 448 static void 449 fbt_destroy(void *arg, dtrace_id_t id, void *parg) 450 { 451 fbt_probe_t *fbt = parg, *next, *hash, *last; 452 struct modctl *ctl = fbt->fbtp_ctl; 453 int ndx; 454 455 do { 456 if (ctl != NULL && ctl->mod_loadcnt == fbt->fbtp_loadcnt) { 457 if ((ctl->mod_loadcnt == fbt->fbtp_loadcnt && 458 ctl->mod_loaded)) { 459 ((struct module *) 460 (ctl->mod_mp))->fbt_nentries--; 461 } 462 } 463 464 /* 465 * Now we need to remove this probe from the fbt_probetab. 466 */ 467 ndx = FBT_ADDR2NDX(fbt->fbtp_patchpoint); 468 last = NULL; 469 hash = fbt_probetab[ndx]; 470 471 while (hash != fbt) { 472 ASSERT(hash != NULL); 473 last = hash; 474 hash = hash->fbtp_hashnext; 475 } 476 477 if (last != NULL) { 478 last->fbtp_hashnext = fbt->fbtp_hashnext; 479 } else { 480 fbt_probetab[ndx] = fbt->fbtp_hashnext; 481 } 482 483 next = fbt->fbtp_next; 484 kmem_free(fbt, sizeof (fbt_probe_t)); 485 486 fbt = next; 487 } while (fbt != NULL); 488 } 489 490 /*ARGSUSED*/ 491 static void 492 fbt_enable(void *arg, dtrace_id_t id, void *parg) 493 { 494 fbt_probe_t *fbt = parg; 495 struct modctl *ctl = fbt->fbtp_ctl; 496 497 ctl->mod_nenabled++; 498 499 if (!ctl->mod_loaded) { 500 if (fbt_verbose) { 501 cmn_err(CE_NOTE, "fbt is failing for probe %s " 502 "(module %s unloaded)", 503 fbt->fbtp_name, ctl->mod_modname); 504 } 505 506 return; 507 } 508 509 /* 510 * Now check that our modctl has the expected load count. If it 511 * doesn't, this module must have been unloaded and reloaded -- and 512 * we're not going to touch it. 513 */ 514 if (ctl->mod_loadcnt != fbt->fbtp_loadcnt) { 515 if (fbt_verbose) { 516 cmn_err(CE_NOTE, "fbt is failing for probe %s " 517 "(module %s reloaded)", 518 fbt->fbtp_name, ctl->mod_modname); 519 } 520 521 return; 522 } 523 524 for (; fbt != NULL; fbt = fbt->fbtp_next) 525 *fbt->fbtp_patchpoint = fbt->fbtp_patchval; 526 } 527 528 /*ARGSUSED*/ 529 static void 530 fbt_disable(void *arg, dtrace_id_t id, void *parg) 531 { 532 fbt_probe_t *fbt = parg; 533 struct modctl *ctl = fbt->fbtp_ctl; 534 535 ASSERT(ctl->mod_nenabled > 0); 536 ctl->mod_nenabled--; 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_savedval; 543 } 544 545 /*ARGSUSED*/ 546 static void 547 fbt_suspend(void *arg, dtrace_id_t id, void *parg) 548 { 549 fbt_probe_t *fbt = parg; 550 struct modctl *ctl = fbt->fbtp_ctl; 551 552 ASSERT(ctl->mod_nenabled > 0); 553 554 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 555 return; 556 557 for (; fbt != NULL; fbt = fbt->fbtp_next) 558 *fbt->fbtp_patchpoint = fbt->fbtp_savedval; 559 } 560 561 /*ARGSUSED*/ 562 static void 563 fbt_resume(void *arg, dtrace_id_t id, void *parg) 564 { 565 fbt_probe_t *fbt = parg; 566 struct modctl *ctl = fbt->fbtp_ctl; 567 568 ASSERT(ctl->mod_nenabled > 0); 569 570 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 571 return; 572 573 for (; fbt != NULL; fbt = fbt->fbtp_next) 574 *fbt->fbtp_patchpoint = fbt->fbtp_patchval; 575 } 576 577 /*ARGSUSED*/ 578 static void 579 fbt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc) 580 { 581 fbt_probe_t *fbt = parg; 582 struct modctl *ctl = fbt->fbtp_ctl; 583 struct module *mp = ctl->mod_mp; 584 ctf_file_t *fp = NULL, *pfp; 585 ctf_funcinfo_t f; 586 int error; 587 ctf_id_t argv[32], type; 588 int argc = sizeof (argv) / sizeof (ctf_id_t); 589 const char *parent; 590 591 if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt)) 592 goto err; 593 594 if (fbt->fbtp_roffset != 0 && desc->dtargd_ndx == 0) { 595 (void) strcpy(desc->dtargd_native, "int"); 596 return; 597 } 598 599 if ((fp = ctf_modopen(mp, &error)) == NULL) { 600 /* 601 * We have no CTF information for this module -- and therefore 602 * no args[] information. 603 */ 604 goto err; 605 } 606 607 /* 608 * If we have a parent container, we must manually import it. 609 */ 610 if ((parent = ctf_parent_name(fp)) != NULL) { 611 struct modctl *mod; 612 613 /* 614 * We must iterate over all modules to find the module that 615 * is our parent. 616 */ 617 for (mod = &modules; mod != NULL; mod = mod->mod_next) { 618 if (strcmp(mod->mod_filename, parent) == 0) 619 break; 620 } 621 622 if (mod == NULL) 623 goto err; 624 625 if ((pfp = ctf_modopen(mod->mod_mp, &error)) == NULL) 626 goto err; 627 628 if (ctf_import(fp, pfp) != 0) { 629 ctf_close(pfp); 630 goto err; 631 } 632 633 ctf_close(pfp); 634 } 635 636 if (ctf_func_info(fp, fbt->fbtp_symndx, &f) == CTF_ERR) 637 goto err; 638 639 if (fbt->fbtp_roffset != 0) { 640 if (desc->dtargd_ndx > 1) 641 goto err; 642 643 ASSERT(desc->dtargd_ndx == 1); 644 type = f.ctc_return; 645 } else { 646 if (desc->dtargd_ndx + 1 > f.ctc_argc) 647 goto err; 648 649 if (ctf_func_args(fp, fbt->fbtp_symndx, argc, argv) == CTF_ERR) 650 goto err; 651 652 type = argv[desc->dtargd_ndx]; 653 } 654 655 if (ctf_type_name(fp, type, desc->dtargd_native, 656 DTRACE_ARGTYPELEN) != NULL) { 657 ctf_close(fp); 658 return; 659 } 660 err: 661 if (fp != NULL) 662 ctf_close(fp); 663 664 desc->dtargd_ndx = DTRACE_ARGNONE; 665 } 666 667 static dtrace_pattr_t fbt_attr = { 668 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA }, 669 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 670 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 671 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA }, 672 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA }, 673 }; 674 675 static dtrace_pops_t fbt_pops = { 676 NULL, 677 fbt_provide_module, 678 fbt_enable, 679 fbt_disable, 680 fbt_suspend, 681 fbt_resume, 682 fbt_getargdesc, 683 NULL, 684 NULL, 685 fbt_destroy 686 }; 687 688 static void 689 fbt_cleanup(dev_info_t *devi) 690 { 691 dtrace_invop_remove(fbt_invop); 692 ddi_remove_minor_node(devi, NULL); 693 kmem_free(fbt_probetab, fbt_probetab_size * sizeof (fbt_probe_t *)); 694 fbt_probetab = NULL; 695 fbt_probetab_mask = 0; 696 } 697 698 static int 699 fbt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 700 { 701 switch (cmd) { 702 case DDI_ATTACH: 703 break; 704 case DDI_RESUME: 705 return (DDI_SUCCESS); 706 default: 707 return (DDI_FAILURE); 708 } 709 710 if (fbt_probetab_size == 0) 711 fbt_probetab_size = FBT_PROBETAB_SIZE; 712 713 fbt_probetab_mask = fbt_probetab_size - 1; 714 fbt_probetab = 715 kmem_zalloc(fbt_probetab_size * sizeof (fbt_probe_t *), KM_SLEEP); 716 717 dtrace_invop_add(fbt_invop); 718 719 if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0, 720 DDI_PSEUDO, NULL) == DDI_FAILURE || 721 dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, NULL, 722 &fbt_pops, NULL, &fbt_id) != 0) { 723 fbt_cleanup(devi); 724 return (DDI_FAILURE); 725 } 726 727 ddi_report_dev(devi); 728 fbt_devi = devi; 729 730 return (DDI_SUCCESS); 731 } 732 733 static int 734 fbt_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 735 { 736 switch (cmd) { 737 case DDI_DETACH: 738 break; 739 case DDI_SUSPEND: 740 return (DDI_SUCCESS); 741 default: 742 return (DDI_FAILURE); 743 } 744 745 if (dtrace_unregister(fbt_id) != 0) 746 return (DDI_FAILURE); 747 748 fbt_cleanup(devi); 749 750 return (DDI_SUCCESS); 751 } 752 753 /*ARGSUSED*/ 754 static int 755 fbt_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 756 { 757 int error; 758 759 switch (infocmd) { 760 case DDI_INFO_DEVT2DEVINFO: 761 *result = (void *)fbt_devi; 762 error = DDI_SUCCESS; 763 break; 764 case DDI_INFO_DEVT2INSTANCE: 765 *result = (void *)0; 766 error = DDI_SUCCESS; 767 break; 768 default: 769 error = DDI_FAILURE; 770 } 771 return (error); 772 } 773 774 /*ARGSUSED*/ 775 static int 776 fbt_open(dev_t *devp, int flag, int otyp, cred_t *cred_p) 777 { 778 return (0); 779 } 780 781 static struct cb_ops fbt_cb_ops = { 782 fbt_open, /* open */ 783 nodev, /* close */ 784 nulldev, /* strategy */ 785 nulldev, /* print */ 786 nodev, /* dump */ 787 nodev, /* read */ 788 nodev, /* write */ 789 nodev, /* ioctl */ 790 nodev, /* devmap */ 791 nodev, /* mmap */ 792 nodev, /* segmap */ 793 nochpoll, /* poll */ 794 ddi_prop_op, /* cb_prop_op */ 795 0, /* streamtab */ 796 D_NEW | D_MP /* Driver compatibility flag */ 797 }; 798 799 static struct dev_ops fbt_ops = { 800 DEVO_REV, /* devo_rev */ 801 0, /* refcnt */ 802 fbt_info, /* get_dev_info */ 803 nulldev, /* identify */ 804 nulldev, /* probe */ 805 fbt_attach, /* attach */ 806 fbt_detach, /* detach */ 807 nodev, /* reset */ 808 &fbt_cb_ops, /* driver operations */ 809 NULL, /* bus operations */ 810 nodev /* dev power */ 811 }; 812 813 /* 814 * Module linkage information for the kernel. 815 */ 816 static struct modldrv modldrv = { 817 &mod_driverops, /* module type (this is a pseudo driver) */ 818 "Function Boundary Tracing", /* name of module */ 819 &fbt_ops, /* driver ops */ 820 }; 821 822 static struct modlinkage modlinkage = { 823 MODREV_1, 824 (void *)&modldrv, 825 NULL 826 }; 827 828 int 829 _init(void) 830 { 831 return (mod_install(&modlinkage)); 832 } 833 834 int 835 _info(struct modinfo *modinfop) 836 { 837 return (mod_info(&modlinkage, modinfop)); 838 } 839 840 int 841 _fini(void) 842 { 843 return (mod_remove(&modlinkage)); 844 } 845