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 /* 29 * isa-dependent portions of the kmdb target 30 */ 31 32 #include <kmdb/kvm.h> 33 #include <kmdb/kvm_cpu.h> 34 #include <kmdb/kmdb_kdi.h> 35 #include <kmdb/kmdb_asmutil.h> 36 #include <mdb/mdb_debug.h> 37 #include <mdb/mdb_err.h> 38 #include <mdb/mdb_list.h> 39 #include <mdb/mdb_target_impl.h> 40 #include <mdb/mdb_isautil.h> 41 #include <mdb/mdb_kreg_impl.h> 42 #include <mdb/mdb.h> 43 44 #include <sys/types.h> 45 #include <sys/frame.h> 46 #include <sys/trap.h> 47 #include <sys/bitmap.h> 48 #include <sys/pci_impl.h> 49 50 /* Higher than the highest trap number for which we have a defined specifier */ 51 #define KMT_MAXTRAPNO 0x20 52 53 #define IOPORTLIMIT 0xffff /* XXX find a new home for this */ 54 55 const char * 56 kmt_def_dismode(void) 57 { 58 #ifdef __amd64 59 return ("amd64"); 60 #else 61 return ("ia32"); 62 #endif 63 } 64 65 int 66 kmt_step_out_validate(mdb_tgt_t *t, uintptr_t pc) 67 { 68 kmt_data_t *kmt = t->t_data; 69 int i; 70 71 for (i = 0; i < sizeof (kmt->kmt_intrsyms) / sizeof (GElf_Sym); i++) { 72 GElf_Sym *sym = (GElf_Sym *)&kmt->kmt_intrsyms + i; 73 74 if (pc >= sym->st_value && pc < sym->st_value + sym->st_size) 75 return (0); 76 } 77 78 return (1); 79 } 80 81 /* 82 * Determine the return address for the current frame. 83 */ 84 int 85 kmt_step_out(mdb_tgt_t *t, uintptr_t *p) 86 { 87 mdb_instr_t instr; 88 kreg_t pc, sp, fp; 89 90 (void) kmdb_dpi_get_register("pc", &pc); 91 (void) kmdb_dpi_get_register("sp", &sp); 92 (void) kmdb_dpi_get_register("fp", &fp); 93 94 if (mdb_tgt_vread(t, &instr, sizeof (mdb_instr_t), pc) != 95 sizeof (mdb_instr_t)) 96 return (-1); /* errno is set for us */ 97 98 if (!kmt_step_out_validate(t, pc)) 99 return (set_errno(EMDB_TGTNOTSUP)); 100 101 return (mdb_isa_step_out(t, p, pc, fp, sp, instr)); 102 } 103 104 int 105 kmt_step_branch(mdb_tgt_t *t) 106 { 107 kmt_data_t *kmt = t->t_data; 108 109 return (kmt_cpu_step_branch(t, kmt->kmt_cpu)); 110 } 111 112 /* 113 * Return the address of the next instruction following a call, or return -1 114 * and set errno to EAGAIN if the target should just single-step. 115 */ 116 int 117 kmt_next(mdb_tgt_t *t, uintptr_t *p) 118 { 119 kreg_t pc; 120 mdb_instr_t instr; 121 122 (void) kmdb_dpi_get_register("pc", &pc); 123 124 if (mdb_tgt_vread(t, &instr, sizeof (mdb_instr_t), pc) != 125 sizeof (mdb_instr_t)) 126 return (-1); /* errno is set for us */ 127 128 return (mdb_isa_next(t, p, pc, instr)); 129 } 130 131 /* 132 * Return a flag indicating if the specified %eip is likely to have an 133 * interrupt frame on the stack. We do this by comparing the address to the 134 * range of addresses spanned by several well-known routines, and looking 135 * to see if the next and previous %ebp values are "far" apart. Sigh. 136 */ 137 int 138 mdb_kvm_intrframe(mdb_tgt_t *t, uintptr_t pc, uintptr_t fp, 139 uintptr_t prevfp) 140 { 141 kmt_data_t *kmt = t->t_data; 142 const size_t dist = 0x800 * sizeof (uintptr_t); 143 144 return ((pc >= kmt->kmt_cmnint.st_value && 145 (pc < kmt->kmt_cmnint.st_value + kmt->kmt_cmnint.st_size)) || 146 (pc >= kmt->kmt_cmntrap.st_value && 147 (pc < kmt->kmt_cmntrap.st_value + kmt->kmt_cmntrap.st_size)) || 148 (fp >= prevfp + dist) || (fp <= prevfp - dist)); 149 } 150 151 /*ARGSUSED*/ 152 static int 153 kmt_stack_common(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv, 154 int cpuid, mdb_tgt_stack_f *func) 155 { 156 const mdb_tgt_gregset_t *grp = NULL; 157 mdb_tgt_gregset_t gregs; 158 void *arg = (void *)(uintptr_t)mdb.m_nargs; 159 160 if (flags & DCMD_ADDRSPEC) { 161 bzero(&gregs, sizeof (gregs)); 162 gregs.kregs[KREG_FP] = addr; 163 grp = &gregs; 164 } else 165 grp = kmdb_dpi_get_gregs(cpuid); 166 167 if (grp == NULL) { 168 warn("failed to retrieve registers for cpu %d", cpuid); 169 return (DCMD_ERR); 170 } 171 172 if (argc != 0) { 173 if (argv->a_type == MDB_TYPE_CHAR || argc > 1) 174 return (DCMD_USAGE); 175 176 if (argv->a_type == MDB_TYPE_STRING) 177 arg = (void *)(uintptr_t)mdb_strtoull(argv->a_un.a_str); 178 else 179 arg = (void *)(uintptr_t)argv->a_un.a_val; 180 } 181 182 (void) mdb_isa_kvm_stack_iter(mdb.m_target, grp, func, arg); 183 184 return (DCMD_OK); 185 } 186 187 int 188 kmt_cpustack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv, 189 int cpuid, int verbose) 190 { 191 return (kmt_stack_common(addr, flags, argc, argv, cpuid, 192 (verbose ? mdb_isa_kvm_framev : mdb_isa_kvm_frame))); 193 } 194 195 int 196 kmt_stack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 197 { 198 return (kmt_stack_common(addr, flags, argc, argv, DPI_MASTER_CPUID, 199 mdb_isa_kvm_frame)); 200 } 201 202 int 203 kmt_stackv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 204 { 205 return (kmt_stack_common(addr, flags, argc, argv, DPI_MASTER_CPUID, 206 mdb_isa_kvm_framev)); 207 } 208 209 int 210 kmt_stackr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 211 { 212 return (kmt_stack_common(addr, flags, argc, argv, DPI_MASTER_CPUID, 213 mdb_isa_kvm_framev)); 214 } 215 216 /*ARGSUSED*/ 217 void 218 kmt_printregs(const mdb_tgt_gregset_t *gregs) 219 { 220 mdb_isa_printregs(gregs); 221 } 222 223 #define IOCHECK_NOWARN 0 224 #define IOCHECK_WARN 1 225 226 static int 227 kmt_io_check(uint64_t nbytes, uintptr_t addr, int dowarn) 228 { 229 if (addr > IOPORTLIMIT) { 230 if (dowarn) 231 warn("port address must be 0-%#x\n", IOPORTLIMIT); 232 return (set_errno(EINVAL)); 233 } 234 235 if (nbytes != 1 && nbytes != 2 && nbytes != 4) { 236 if (dowarn) 237 warn("port access must be 1, 2, or 4 bytes\n"); 238 return (set_errno(EINVAL)); 239 } 240 241 if ((addr & (nbytes - 1)) != 0) { 242 if (dowarn) { 243 warn("address for %llu-byte access must be %llu-byte " 244 "aligned\n", (u_longlong_t)nbytes, 245 (u_longlong_t)nbytes); 246 } 247 return (set_errno(EINVAL)); 248 } 249 250 return (0); 251 } 252 253 /*ARGSUSED1*/ 254 int 255 kmt_in_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 256 { 257 uint64_t len = 0; 258 uint32_t buf; 259 260 if (mdb_getopts(argc, argv, 261 'L', MDB_OPT_UINT64, &len, 262 NULL) != argc) 263 return (DCMD_USAGE); 264 265 if (len == 0) 266 len = mdb.m_dcount; 267 268 if (kmt_io_check(len, addr, IOCHECK_WARN) < 0) 269 return (DCMD_ERR); 270 271 if (mdb_tgt_ioread(mdb.m_target, &buf, len, addr) < 0) { 272 warn("failed to read from port 0x%llx", (u_longlong_t)addr); 273 return (DCMD_ERR); 274 } 275 276 mdb_printf("%x\n", buf); 277 278 return (DCMD_OK); 279 } 280 281 static uint64_t 282 kmt_numarg(const mdb_arg_t *arg) 283 { 284 if (arg->a_type == MDB_TYPE_STRING) 285 return (mdb_strtoull(arg->a_un.a_str)); 286 else 287 return (arg->a_un.a_val); 288 } 289 290 /*ARGSUSED1*/ 291 int 292 kmt_out_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 293 { 294 uint64_t len = 0; 295 uint64_t val; 296 297 if (mdb_getopts(argc, argv, 298 'L', MDB_OPT_UINT64, &len, 299 NULL) != argc - 1) 300 return (DCMD_USAGE); 301 302 if (len == 0) 303 len = mdb.m_dcount; 304 305 argv += argc - 1; 306 val = kmt_numarg(argv); 307 308 if (kmt_io_check(len, addr, IOCHECK_WARN) < 0) 309 return (DCMD_ERR); 310 311 if (val > (1ULL << (len * NBBY)) - 1) { 312 warn("value is out of range for port size\n"); 313 return (DCMD_ERR); 314 } 315 316 if (mdb_tgt_iowrite(mdb.m_target, &val, len, addr) < 0) { 317 warn("failed to write to port %llx", (u_longlong_t)addr); 318 return (DCMD_ERR); 319 } 320 321 return (DCMD_OK); 322 } 323 324 static int 325 kmt_rwmsr(uint32_t addr, uint64_t *valp, void (*rw)(uint32_t, uint64_t *)) 326 { 327 jmp_buf pcb, *oldpcb = NULL; 328 329 if (setjmp(pcb) != 0) { 330 kmdb_dpi_restore_fault_hdlr(oldpcb); 331 return (-1); /* errno is set for us */ 332 } 333 334 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb); 335 rw(addr, valp); 336 kmdb_dpi_restore_fault_hdlr(oldpcb); 337 338 return (0); 339 } 340 341 /*ARGSUSED*/ 342 int 343 kmt_rdmsr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 344 { 345 uint64_t val; 346 347 if (!(flags & DCMD_ADDRSPEC)) 348 return (DCMD_USAGE); 349 350 if (kmt_rwmsr(addr, &val, rdmsr) < 0) { 351 warn("rdmsr failed"); 352 return (DCMD_ERR); 353 } 354 355 mdb_printf("%llx\n", (u_longlong_t)val); 356 357 return (DCMD_OK); 358 } 359 360 /*ARGSUSED*/ 361 int 362 kmt_wrmsr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 363 { 364 uint64_t val; 365 366 if (!(flags & DCMD_ADDRSPEC) || argc != 1) 367 return (DCMD_USAGE); 368 369 val = kmt_numarg(argv); 370 371 if (kmt_rwmsr(addr, &val, wrmsr)) { 372 warn("wrmsr failed"); 373 return (DCMD_ERR); 374 } 375 376 return (DCMD_OK); 377 } 378 379 int 380 kmt_msr_validate(const kmdb_msr_t *msr) 381 { 382 uint64_t val; 383 384 for (/* */; msr->msr_num != 0; msr++) { 385 if (kmt_rwmsr(msr->msr_num, &val, rdmsr) < 0) 386 return (0); 387 } 388 389 return (1); 390 } 391 392 /*ARGSUSED*/ 393 ssize_t 394 kmt_write(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 395 { 396 if (!(t->t_flags & MDB_TGT_F_ALLOWIO) && 397 (nbytes = kmdb_kdi_range_is_nontoxic(addr, nbytes, 1)) == 0) 398 return (set_errno(EMDB_NOMAP)); 399 400 /* 401 * No writes to user space are allowed. If we were to allow it, we'd 402 * be in the unfortunate situation where kmdb could place a breakpoint 403 * on a userspace executable page; this dirty page would end up being 404 * flushed back to disk, incurring sadness when it's next executed. 405 * Besides, we can't allow trapping in from userspace anyway. 406 */ 407 if (addr < kmdb_kdi_get_userlimit()) 408 return (set_errno(EMDB_TGTNOTSUP)); 409 410 return (kmt_rw(t, (void *)buf, nbytes, addr, kmt_writer)); 411 } 412 413 /*ARGSUSED*/ 414 static ssize_t 415 kmt_iorw(mdb_tgt_t *t, void *buf, size_t nbytes, uint64_t addr, 416 void (*iorw)(void *, size_t, uintptr_t)) 417 { 418 jmp_buf pcb, *oldpcb = NULL; 419 420 if (kmt_io_check(nbytes, addr, IOCHECK_NOWARN) < 0) 421 return (-1); /* errno is set for us */ 422 423 if (setjmp(pcb) != 0) { 424 kmdb_dpi_restore_fault_hdlr(oldpcb); 425 return (-1); /* errno is set for us */ 426 } 427 428 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb); 429 iorw(buf, nbytes, addr); 430 kmdb_dpi_restore_fault_hdlr(oldpcb); 431 432 return (nbytes); 433 } 434 435 /*ARGSUSED*/ 436 ssize_t 437 kmt_ioread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr) 438 { 439 return (kmt_iorw(t, buf, nbytes, addr, kmt_in)); 440 } 441 442 /*ARGSUSED*/ 443 ssize_t 444 kmt_iowrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 445 { 446 return (kmt_iorw(t, (void *)buf, nbytes, addr, kmt_out)); 447 } 448 449 static int 450 kmt_pcicfg_common(uintptr_t off, uint32_t *valp, const mdb_arg_t *argv, 451 void (*rw)(void *, size_t, uintptr_t)) 452 { 453 uint32_t bus, dev, func; 454 uint32_t addr; 455 456 bus = kmt_numarg(&argv[0]); 457 dev = kmt_numarg(&argv[1]); 458 func = kmt_numarg(&argv[2]); 459 460 if ((bus & 0xffff) != bus) { 461 warn("invalid bus number (must be 0-0xffff)\n"); 462 return (DCMD_ERR); 463 } 464 465 if ((dev & 0x1f) != dev) { 466 warn("invalid device number (must be 0-0x1f)\n"); 467 return (DCMD_ERR); 468 } 469 470 if ((func & 0x7) != func) { 471 warn("invalid function number (must be 0-7)\n"); 472 return (DCMD_ERR); 473 } 474 475 if ((off & 0xfc) != off) { 476 warn("invalid register number (must be 0-0xff, and 4-byte " 477 "aligned\n"); 478 return (DCMD_ERR); 479 } 480 481 addr = PCI_CADDR1(bus, dev, func, off); 482 483 if (kmt_iowrite(mdb.m_target, &addr, sizeof (addr), PCI_CONFADD) != 484 sizeof (addr)) { 485 warn("write of PCI_CONFADD failed"); 486 return (DCMD_ERR); 487 } 488 489 if (kmt_iorw(mdb.m_target, valp, sizeof (*valp), PCI_CONFDATA, rw) != 490 sizeof (*valp)) { 491 warn("access to PCI_CONFDATA failed"); 492 return (DCMD_ERR); 493 } 494 495 return (DCMD_OK); 496 } 497 498 /*ARGSUSED*/ 499 int 500 kmt_rdpcicfg(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 501 { 502 uint32_t val; 503 504 if (argc != 3 || !(flags & DCMD_ADDRSPEC)) 505 return (DCMD_USAGE); 506 507 if (kmt_pcicfg_common(addr, &val, argv, kmt_in) != DCMD_OK) 508 return (DCMD_ERR); 509 510 mdb_printf("%llx\n", (u_longlong_t)val); 511 512 return (DCMD_OK); 513 } 514 515 /*ARGSUSED*/ 516 int 517 kmt_wrpcicfg(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 518 { 519 uint32_t val; 520 521 if (argc != 4 || !(flags & DCMD_ADDRSPEC)) 522 return (DCMD_USAGE); 523 524 val = (uint32_t)kmt_numarg(&argv[3]); 525 526 if (kmt_pcicfg_common(addr, &val, argv, kmt_out) != DCMD_OK) 527 return (DCMD_ERR); 528 529 return (DCMD_OK); 530 } 531 532 const char * 533 kmt_trapname(int trapnum) 534 { 535 static char trapname[11]; 536 537 switch (trapnum) { 538 case T_ZERODIV: 539 return ("division by zero (#de) trap"); 540 case T_SGLSTP: 541 return ("single-step (#db) trap"); 542 case T_NMIFLT: 543 return ("NMI"); 544 case T_BPTFLT: 545 return ("breakpoint (#bp) trap"); 546 case T_ILLINST: 547 return ("illegal instruction (#ud) trap"); 548 case T_SEGFLT: 549 return ("segment not present (#np) trap"); 550 case T_STKFLT: 551 return ("stack (#ss) trap"); 552 case T_GPFLT: 553 return ("general protection (#gp) trap"); 554 case T_PGFLT: 555 return ("page fault (#pf) trap"); 556 case T_ALIGNMENT: 557 return ("alignment check (#ac) trap"); 558 case T_MCE: 559 return ("machine check (#mc) trap"); 560 case T_SIMDFPE: 561 return ("SSE/SSE2 (#xm) trap"); 562 case T_DBGENTR: 563 return ("debugger entry trap"); 564 default: 565 (void) mdb_snprintf(trapname, sizeof (trapname), "trap %#x", 566 trapnum); 567 return (trapname); 568 } 569 } 570 571 void 572 kmt_init_isadep(mdb_tgt_t *t) 573 { 574 kmt_data_t *kmt = t->t_data; 575 576 kmt->kmt_rds = mdb_isa_kregs; 577 578 kmt->kmt_trapmax = KMT_MAXTRAPNO; 579 kmt->kmt_trapmap = mdb_zalloc(BT_SIZEOFMAP(kmt->kmt_trapmax), UM_SLEEP); 580 581 /* Traps for which we want to provide an explicit message */ 582 (void) mdb_tgt_add_fault(t, T_ZERODIV, MDB_TGT_SPEC_INTERNAL, 583 no_se_f, NULL); 584 (void) mdb_tgt_add_fault(t, T_ILLINST, MDB_TGT_SPEC_INTERNAL, 585 no_se_f, NULL); 586 (void) mdb_tgt_add_fault(t, T_SEGFLT, MDB_TGT_SPEC_INTERNAL, 587 no_se_f, NULL); 588 (void) mdb_tgt_add_fault(t, T_STKFLT, MDB_TGT_SPEC_INTERNAL, 589 no_se_f, NULL); 590 (void) mdb_tgt_add_fault(t, T_GPFLT, MDB_TGT_SPEC_INTERNAL, 591 no_se_f, NULL); 592 (void) mdb_tgt_add_fault(t, T_PGFLT, MDB_TGT_SPEC_INTERNAL, 593 no_se_f, NULL); 594 (void) mdb_tgt_add_fault(t, T_ALIGNMENT, MDB_TGT_SPEC_INTERNAL, 595 no_se_f, NULL); 596 (void) mdb_tgt_add_fault(t, T_MCE, MDB_TGT_SPEC_INTERNAL, 597 no_se_f, NULL); 598 (void) mdb_tgt_add_fault(t, T_SIMDFPE, MDB_TGT_SPEC_INTERNAL, 599 no_se_f, NULL); 600 601 /* 602 * Traps which will be handled elsewhere, and which therefore don't 603 * need the trap-based message. 604 */ 605 BT_SET(kmt->kmt_trapmap, T_SGLSTP); 606 BT_SET(kmt->kmt_trapmap, T_BPTFLT); 607 BT_SET(kmt->kmt_trapmap, T_DBGENTR); 608 609 /* Catch-all for traps not explicitly listed here */ 610 (void) mdb_tgt_add_fault(t, KMT_TRAP_NOTENUM, MDB_TGT_SPEC_INTERNAL, 611 no_se_f, NULL); 612 } 613 614 void 615 kmt_startup_isadep(mdb_tgt_t *t) 616 { 617 kmt_data_t *kmt = t->t_data; 618 619 /* 620 * The stack trace and ::step out code need to detect "interrupt" 621 * frames. The heuristic they use to detect said frames requires the 622 * addresses of routines that can generate them. 623 */ 624 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 625 "cmnint", &kmt->kmt_intrsyms._kmt_cmnint, NULL); 626 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 627 "cmntrap", &kmt->kmt_intrsyms._kmt_cmntrap, NULL); 628 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 629 "sys_sysenter", &kmt->kmt_intrsyms._kmt_sysenter, NULL); 630 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 631 "brand_sys_sysenter", &kmt->kmt_intrsyms._kmt_brand_sysenter, NULL); 632 #if defined(__amd64) 633 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 634 "sys_syscall", &kmt->kmt_intrsyms._kmt_syscall, NULL); 635 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 636 "brand_sys_syscall", &kmt->kmt_intrsyms._kmt_brand_syscall, NULL); 637 #endif 638 } 639