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 /* 30 * isa-dependent portions of the kmdb target 31 */ 32 33 #include <kmdb/kvm.h> 34 #include <kmdb/kvm_cpu.h> 35 #include <kmdb/kmdb_kdi.h> 36 #include <kmdb/kmdb_asmutil.h> 37 #include <mdb/mdb_debug.h> 38 #include <mdb/mdb_err.h> 39 #include <mdb/mdb_list.h> 40 #include <mdb/mdb_target_impl.h> 41 #include <mdb/mdb_isautil.h> 42 #include <mdb/mdb_kreg_impl.h> 43 #include <mdb/mdb.h> 44 45 #include <sys/types.h> 46 #include <sys/frame.h> 47 #include <sys/trap.h> 48 #include <sys/bitmap.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 /*ARGSUSED1*/ 282 int 283 kmt_out_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 284 { 285 uint64_t len = 0; 286 uint64_t val; 287 288 if (mdb_getopts(argc, argv, 289 'L', MDB_OPT_UINT64, &len, 290 NULL) != argc - 1) 291 return (DCMD_USAGE); 292 293 if (len == 0) 294 len = mdb.m_dcount; 295 296 argv += argc - 1; 297 if (argv->a_type == MDB_TYPE_STRING) 298 val = mdb_strtoull(argv->a_un.a_str); 299 else 300 val = argv->a_un.a_val; 301 302 if (kmt_io_check(len, addr, IOCHECK_WARN) < 0) 303 return (DCMD_ERR); 304 305 if (val > (1ULL << (len * NBBY)) - 1) { 306 warn("value is out of range for port size\n"); 307 return (DCMD_ERR); 308 } 309 310 if (mdb_tgt_iowrite(mdb.m_target, &val, len, addr) < 0) { 311 warn("failed to write to port %llx", (u_longlong_t)addr); 312 return (DCMD_ERR); 313 } 314 315 return (DCMD_OK); 316 } 317 318 static int 319 kmt_rwmsr(uint32_t addr, uint64_t *valp, void (*rw)(uint32_t, uint64_t *)) 320 { 321 jmp_buf pcb, *oldpcb = NULL; 322 323 if (setjmp(pcb) != 0) { 324 kmdb_dpi_restore_fault_hdlr(oldpcb); 325 return (-1); /* errno is set for us */ 326 } 327 328 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb); 329 rw(addr, valp); 330 kmdb_dpi_restore_fault_hdlr(oldpcb); 331 332 return (0); 333 } 334 335 /*ARGSUSED*/ 336 int 337 kmt_rdmsr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 338 { 339 uint64_t val; 340 341 if (!(flags & DCMD_ADDRSPEC)) 342 return (DCMD_USAGE); 343 344 if (kmt_rwmsr(addr, &val, rdmsr) < 0) { 345 warn("rdmsr failed"); 346 return (DCMD_ERR); 347 } 348 349 mdb_printf("%llx\n", (u_longlong_t)val); 350 351 return (DCMD_OK); 352 } 353 354 /*ARGSUSED*/ 355 int 356 kmt_wrmsr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 357 { 358 uint64_t val; 359 360 if (!(flags & DCMD_ADDRSPEC) || argc != 1) 361 return (DCMD_USAGE); 362 363 if (argv->a_type == MDB_TYPE_STRING) 364 val = mdb_strtoull(argv->a_un.a_str); 365 else 366 val = argv->a_un.a_val; 367 368 if (kmt_rwmsr(addr, &val, wrmsr)) { 369 warn("wrmsr failed"); 370 return (DCMD_ERR); 371 } 372 373 return (DCMD_OK); 374 } 375 376 int 377 kmt_msr_validate(const kmdb_msr_t *msr) 378 { 379 uint64_t val; 380 381 for (/* */; msr->msr_num != 0; msr++) { 382 if (kmt_rwmsr(msr->msr_num, &val, rdmsr) < 0) 383 return (0); 384 } 385 386 return (1); 387 } 388 389 /*ARGSUSED*/ 390 ssize_t 391 kmt_write(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 392 { 393 if (!(t->t_flags & MDB_TGT_F_ALLOWIO) && 394 (nbytes = kmdb_kdi_range_is_nontoxic(addr, nbytes, 1)) == 0) 395 return (set_errno(EMDB_NOMAP)); 396 397 return (kmt_rw(t, (void *)buf, nbytes, addr, kmt_writer)); 398 } 399 400 /*ARGSUSED*/ 401 static ssize_t 402 kmt_iorw(mdb_tgt_t *t, void *buf, size_t nbytes, uint64_t addr, 403 void (*iorw)(void *, size_t, uintptr_t)) 404 { 405 jmp_buf pcb, *oldpcb = NULL; 406 407 if (kmt_io_check(nbytes, addr, IOCHECK_NOWARN) < 0) 408 return (-1); /* errno is set for us */ 409 410 if (setjmp(pcb) != 0) { 411 kmdb_dpi_restore_fault_hdlr(oldpcb); 412 return (-1); /* errno is set for us */ 413 } 414 415 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb); 416 iorw(buf, nbytes, addr); 417 kmdb_dpi_restore_fault_hdlr(oldpcb); 418 419 return (nbytes); 420 } 421 422 /*ARGSUSED*/ 423 ssize_t 424 kmt_ioread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr) 425 { 426 return (kmt_iorw(t, buf, nbytes, addr, kmt_in)); 427 } 428 429 /*ARGSUSED*/ 430 ssize_t 431 kmt_iowrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 432 { 433 return (kmt_iorw(t, (void *)buf, nbytes, addr, kmt_out)); 434 } 435 436 const char * 437 kmt_trapname(int trapnum) 438 { 439 static char trapname[11]; 440 441 switch (trapnum) { 442 case T_ZERODIV: 443 return ("division by zero (#de) trap"); 444 case T_SGLSTP: 445 return ("single-step (#db) trap"); 446 case T_NMIFLT: 447 return ("NMI"); 448 case T_BPTFLT: 449 return ("breakpoint (#bp) trap"); 450 case T_ILLINST: 451 return ("illegal instruction (#ud) trap"); 452 case T_SEGFLT: 453 return ("segment not present (#np) trap"); 454 case T_STKFLT: 455 return ("stack (#ss) trap"); 456 case T_GPFLT: 457 return ("general protection (#gp) trap"); 458 case T_PGFLT: 459 return ("page fault (#pf) trap"); 460 case T_ALIGNMENT: 461 return ("alignment check (#ac) trap"); 462 case T_MCE: 463 return ("machine check (#mc) trap"); 464 case T_SIMDFPE: 465 return ("SSE/SSE2 (#xm) trap"); 466 case T_DBGENTR: 467 return ("debugger entry trap"); 468 default: 469 (void) mdb_snprintf(trapname, sizeof (trapname), "trap %#x", 470 trapnum); 471 return (trapname); 472 } 473 } 474 475 void 476 kmt_init_isadep(mdb_tgt_t *t) 477 { 478 kmt_data_t *kmt = t->t_data; 479 480 kmt->kmt_rds = mdb_isa_kregs; 481 482 kmt->kmt_trapmax = KMT_MAXTRAPNO; 483 kmt->kmt_trapmap = mdb_zalloc(BT_SIZEOFMAP(kmt->kmt_trapmax), UM_SLEEP); 484 485 /* Traps for which we want to provide an explicit message */ 486 (void) mdb_tgt_add_fault(t, T_ZERODIV, MDB_TGT_SPEC_INTERNAL, 487 no_se_f, NULL); 488 (void) mdb_tgt_add_fault(t, T_ILLINST, MDB_TGT_SPEC_INTERNAL, 489 no_se_f, NULL); 490 (void) mdb_tgt_add_fault(t, T_SEGFLT, MDB_TGT_SPEC_INTERNAL, 491 no_se_f, NULL); 492 (void) mdb_tgt_add_fault(t, T_STKFLT, MDB_TGT_SPEC_INTERNAL, 493 no_se_f, NULL); 494 (void) mdb_tgt_add_fault(t, T_GPFLT, MDB_TGT_SPEC_INTERNAL, 495 no_se_f, NULL); 496 (void) mdb_tgt_add_fault(t, T_PGFLT, MDB_TGT_SPEC_INTERNAL, 497 no_se_f, NULL); 498 (void) mdb_tgt_add_fault(t, T_ALIGNMENT, MDB_TGT_SPEC_INTERNAL, 499 no_se_f, NULL); 500 (void) mdb_tgt_add_fault(t, T_MCE, MDB_TGT_SPEC_INTERNAL, 501 no_se_f, NULL); 502 (void) mdb_tgt_add_fault(t, T_SIMDFPE, MDB_TGT_SPEC_INTERNAL, 503 no_se_f, NULL); 504 505 /* 506 * Traps which will be handled elsewhere, and which therefore don't 507 * need the trap-based message. 508 */ 509 BT_SET(kmt->kmt_trapmap, T_SGLSTP); 510 BT_SET(kmt->kmt_trapmap, T_BPTFLT); 511 BT_SET(kmt->kmt_trapmap, T_DBGENTR); 512 513 /* Catch-all for traps not explicitly listed here */ 514 (void) mdb_tgt_add_fault(t, KMT_TRAP_NOTENUM, MDB_TGT_SPEC_INTERNAL, 515 no_se_f, NULL); 516 } 517 518 void 519 kmt_startup_isadep(mdb_tgt_t *t) 520 { 521 kmt_data_t *kmt = t->t_data; 522 523 /* 524 * The stack trace and ::step out code need to detect "interrupt" 525 * frames. The heuristic they use to detect said frames requires the 526 * addresses of routines that can generate them. 527 */ 528 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 529 "cmnint", &kmt->kmt_intrsyms._kmt_cmnint, NULL); 530 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 531 "cmntrap", &kmt->kmt_intrsyms._kmt_cmntrap, NULL); 532 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 533 "sys_sysenter", &kmt->kmt_intrsyms._kmt_sysenter, NULL); 534 #if defined(__amd64) 535 (void) mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC, 536 "sys_syscall", &kmt->kmt_intrsyms._kmt_syscall, NULL); 537 #endif 538 } 539