Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/i386/i386/db_trace.c
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1 /*- 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/6.2/sys/i386/i386/db_trace.c 161320 2006-08-15 15:59:25Z yar $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kdb.h> 33 #include <sys/proc.h> 34 #include <sys/stack.h> 35 #include <sys/sysent.h> 36 37 #include <machine/cpu.h> 38 #include <machine/md_var.h> 39 #include <machine/pcb.h> 40 #include <machine/reg.h> 41 42 #include <vm/vm.h> 43 #include <vm/vm_param.h> 44 #include <vm/pmap.h> 45 46 #include <ddb/ddb.h> 47 #include <ddb/db_access.h> 48 #include <ddb/db_sym.h> 49 #include <ddb/db_variables.h> 50 51 static db_varfcn_t db_dr0; 52 static db_varfcn_t db_dr1; 53 static db_varfcn_t db_dr2; 54 static db_varfcn_t db_dr3; 55 static db_varfcn_t db_dr4; 56 static db_varfcn_t db_dr5; 57 static db_varfcn_t db_dr6; 58 static db_varfcn_t db_dr7; 59 static db_varfcn_t db_esp; 60 static db_varfcn_t db_frame; 61 static db_varfcn_t db_ss; 62 63 /* 64 * Machine register set. 65 */ 66 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x) 67 struct db_variable db_regs[] = { 68 { "cs", DB_OFFSET(tf_cs), db_frame }, 69 { "ds", DB_OFFSET(tf_ds), db_frame }, 70 { "es", DB_OFFSET(tf_es), db_frame }, 71 { "fs", DB_OFFSET(tf_fs), db_frame }, 72 { "ss", NULL, db_ss }, 73 { "eax", DB_OFFSET(tf_eax), db_frame }, 74 { "ecx", DB_OFFSET(tf_ecx), db_frame }, 75 { "edx", DB_OFFSET(tf_edx), db_frame }, 76 { "ebx", DB_OFFSET(tf_ebx), db_frame }, 77 { "esp", NULL, db_esp }, 78 { "ebp", DB_OFFSET(tf_ebp), db_frame }, 79 { "esi", DB_OFFSET(tf_esi), db_frame }, 80 { "edi", DB_OFFSET(tf_edi), db_frame }, 81 { "eip", DB_OFFSET(tf_eip), db_frame }, 82 { "efl", DB_OFFSET(tf_eflags), db_frame }, 83 { "dr0", NULL, db_dr0 }, 84 { "dr1", NULL, db_dr1 }, 85 { "dr2", NULL, db_dr2 }, 86 { "dr3", NULL, db_dr3 }, 87 { "dr4", NULL, db_dr4 }, 88 { "dr5", NULL, db_dr5 }, 89 { "dr6", NULL, db_dr6 }, 90 { "dr7", NULL, db_dr7 }, 91 }; 92 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]); 93 94 #define DB_DRX_FUNC(reg) \ 95 static int \ 96 db_ ## reg (vp, valuep, op) \ 97 struct db_variable *vp; \ 98 db_expr_t * valuep; \ 99 int op; \ 100 { \ 101 if (op == DB_VAR_GET) \ 102 *valuep = r ## reg (); \ 103 else \ 104 load_ ## reg (*valuep); \ 105 return (1); \ 106 } 107 108 DB_DRX_FUNC(dr0) 109 DB_DRX_FUNC(dr1) 110 DB_DRX_FUNC(dr2) 111 DB_DRX_FUNC(dr3) 112 DB_DRX_FUNC(dr4) 113 DB_DRX_FUNC(dr5) 114 DB_DRX_FUNC(dr6) 115 DB_DRX_FUNC(dr7) 116 117 static __inline int 118 get_esp(struct trapframe *tf) 119 { 120 return ((ISPL(tf->tf_cs)) ? tf->tf_esp : 121 (db_expr_t)tf + (uintptr_t)DB_OFFSET(tf_esp)); 122 } 123 124 static int 125 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 126 { 127 int *reg; 128 129 if (kdb_frame == NULL) 130 return (0); 131 132 reg = (int *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep); 133 if (op == DB_VAR_GET) 134 *valuep = *reg; 135 else 136 *reg = *valuep; 137 return (1); 138 } 139 140 static int 141 db_esp(struct db_variable *vp, db_expr_t *valuep, int op) 142 { 143 144 if (kdb_frame == NULL) 145 return (0); 146 147 if (op == DB_VAR_GET) 148 *valuep = get_esp(kdb_frame); 149 else if (ISPL(kdb_frame->tf_cs)) 150 kdb_frame->tf_esp = *valuep; 151 return (1); 152 } 153 154 static int 155 db_ss(struct db_variable *vp, db_expr_t *valuep, int op) 156 { 157 158 if (kdb_frame == NULL) 159 return (0); 160 161 if (op == DB_VAR_GET) 162 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss(); 163 else if (ISPL(kdb_frame->tf_cs)) 164 kdb_frame->tf_ss = *valuep; 165 return (1); 166 } 167 168 /* 169 * Stack trace. 170 */ 171 #define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK && \ 172 ((vm_offset_t)(va)) < VM_MAX_KERNEL_ADDRESS) 173 174 struct i386_frame { 175 struct i386_frame *f_frame; 176 int f_retaddr; 177 int f_arg0; 178 }; 179 180 #define NORMAL 0 181 #define TRAP 1 182 #define INTERRUPT 2 183 #define SYSCALL 3 184 #define DOUBLE_FAULT 4 185 186 static void db_nextframe(struct i386_frame **, db_addr_t *, struct thread *); 187 static int db_numargs(struct i386_frame *); 188 static void db_print_stack_entry(const char *, int, char **, int *, db_addr_t); 189 static void decode_syscall(int, struct thread *); 190 191 static char * watchtype_str(int type); 192 int i386_set_watch(int watchnum, unsigned int watchaddr, int size, int access, 193 struct dbreg * d); 194 int i386_clr_watch(int watchnum, struct dbreg * d); 195 int db_md_set_watchpoint(db_expr_t addr, db_expr_t size); 196 int db_md_clr_watchpoint(db_expr_t addr, db_expr_t size); 197 void db_md_list_watchpoints(void); 198 199 /* 200 * Figure out how many arguments were passed into the frame at "fp". 201 */ 202 static int 203 db_numargs(fp) 204 struct i386_frame *fp; 205 { 206 char *argp; 207 int inst; 208 int args; 209 210 argp = (char *)db_get_value((int)&fp->f_retaddr, 4, FALSE); 211 /* 212 * XXX etext is wrong for LKMs. We should attempt to interpret 213 * the instruction at the return address in all cases. This 214 * may require better fault handling. 215 */ 216 if (argp < btext || argp >= etext) { 217 args = -1; 218 } else { 219 retry: 220 inst = db_get_value((int)argp, 4, FALSE); 221 if ((inst & 0xff) == 0x59) /* popl %ecx */ 222 args = 1; 223 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ 224 args = ((inst >> 16) & 0xff) / 4; 225 else if ((inst & 0xf8ff) == 0xc089) { /* movl %eax, %Reg */ 226 argp += 2; 227 goto retry; 228 } else 229 args = -1; 230 } 231 return (args); 232 } 233 234 static void 235 db_print_stack_entry(name, narg, argnp, argp, callpc) 236 const char *name; 237 int narg; 238 char **argnp; 239 int *argp; 240 db_addr_t callpc; 241 { 242 int n = narg >= 0 ? narg : 5; 243 244 db_printf("%s(", name); 245 while (n) { 246 if (argnp) 247 db_printf("%s=", *argnp++); 248 db_printf("%r", db_get_value((int)argp, 4, FALSE)); 249 argp++; 250 if (--n != 0) 251 db_printf(","); 252 } 253 if (narg < 0) 254 db_printf(",..."); 255 db_printf(") at "); 256 db_printsym(callpc, DB_STGY_PROC); 257 db_printf("\n"); 258 } 259 260 static void 261 decode_syscall(int number, struct thread *td) 262 { 263 struct proc *p; 264 c_db_sym_t sym; 265 db_expr_t diff; 266 sy_call_t *f; 267 const char *symname; 268 269 db_printf(" (%d", number); 270 p = (td != NULL) ? td->td_proc : NULL; 271 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) { 272 f = p->p_sysent->sv_table[number].sy_call; 273 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff); 274 if (sym != DB_SYM_NULL && diff == 0) { 275 db_symbol_values(sym, &symname, NULL); 276 db_printf(", %s, %s", p->p_sysent->sv_name, symname); 277 } 278 } 279 db_printf(")"); 280 } 281 282 /* 283 * Figure out the next frame up in the call stack. 284 */ 285 static void 286 db_nextframe(struct i386_frame **fp, db_addr_t *ip, struct thread *td) 287 { 288 struct trapframe *tf; 289 int frame_type; 290 int eip, esp, ebp; 291 db_expr_t offset; 292 c_db_sym_t sym; 293 const char *name; 294 295 eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE); 296 ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE); 297 298 /* 299 * Figure out frame type. We look at the address just before 300 * the saved instruction pointer as the saved EIP is after the 301 * call function, and if the function being called is marked as 302 * dead (such as panic() at the end of dblfault_handler()), then 303 * the instruction at the saved EIP will be part of a different 304 * function (syscall() in this example) rather than the one that 305 * actually made the call. 306 */ 307 frame_type = NORMAL; 308 sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset); 309 db_symbol_values(sym, &name, NULL); 310 if (name != NULL) { 311 if (strcmp(name, "calltrap") == 0 || 312 strcmp(name, "fork_trampoline") == 0) 313 frame_type = TRAP; 314 else if (strncmp(name, "Xatpic_intr", 11) == 0 || 315 strncmp(name, "Xapic_isr", 9) == 0) 316 frame_type = INTERRUPT; 317 else if (strcmp(name, "Xlcall_syscall") == 0 || 318 strcmp(name, "Xint0x80_syscall") == 0) 319 frame_type = SYSCALL; 320 else if (strcmp(name, "dblfault_handler") == 0) 321 frame_type = DOUBLE_FAULT; 322 } 323 324 /* 325 * Normal frames need no special processing. 326 */ 327 if (frame_type == NORMAL) { 328 *ip = (db_addr_t) eip; 329 *fp = (struct i386_frame *) ebp; 330 return; 331 } 332 333 db_print_stack_entry(name, 0, 0, 0, eip); 334 335 /* 336 * For a double fault, we have to snag the values from the 337 * previous TSS since a double fault uses a task gate to 338 * switch to a known good state. 339 */ 340 if (frame_type == DOUBLE_FAULT) { 341 esp = PCPU_GET(common_tss.tss_esp); 342 eip = PCPU_GET(common_tss.tss_eip); 343 ebp = PCPU_GET(common_tss.tss_ebp); 344 db_printf( 345 "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n", 346 eip, esp, ebp); 347 *ip = (db_addr_t) eip; 348 *fp = (struct i386_frame *) ebp; 349 return; 350 } 351 352 /* 353 * Point to base of trapframe which is just above the 354 * current frame. 355 */ 356 if (frame_type == INTERRUPT) 357 tf = (struct trapframe *)((int)*fp + 12); 358 else 359 tf = (struct trapframe *)((int)*fp + 8); 360 361 if (INKERNEL((int) tf)) { 362 esp = get_esp(tf); 363 eip = tf->tf_eip; 364 ebp = tf->tf_ebp; 365 switch (frame_type) { 366 case TRAP: 367 db_printf("--- trap %#r", tf->tf_trapno); 368 break; 369 case SYSCALL: 370 db_printf("--- syscall"); 371 decode_syscall(tf->tf_eax, td); 372 break; 373 case INTERRUPT: 374 db_printf("--- interrupt"); 375 break; 376 default: 377 panic("The moon has moved again."); 378 } 379 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip, 380 esp, ebp); 381 } 382 383 *ip = (db_addr_t) eip; 384 *fp = (struct i386_frame *) ebp; 385 } 386 387 static int 388 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame, 389 db_addr_t pc, int count) 390 { 391 struct i386_frame *actframe; 392 #define MAXNARG 16 393 char *argnames[MAXNARG], **argnp = NULL; 394 const char *name; 395 int *argp; 396 db_expr_t offset; 397 c_db_sym_t sym; 398 int narg, quit; 399 boolean_t first; 400 401 if (count == -1) 402 count = 1024; 403 404 first = TRUE; 405 quit = 0; 406 db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 407 while (count-- && !quit) { 408 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 409 db_symbol_values(sym, &name, NULL); 410 411 /* 412 * Attempt to determine a (possibly fake) frame that gives 413 * the caller's pc. It may differ from `frame' if the 414 * current function never sets up a standard frame or hasn't 415 * set one up yet or has just discarded one. The last two 416 * cases can be guessed fairly reliably for code generated 417 * by gcc. The first case is too much trouble to handle in 418 * general because the amount of junk on the stack depends 419 * on the pc (the special handling of "calltrap", etc. in 420 * db_nextframe() works because the `next' pc is special). 421 */ 422 actframe = frame; 423 if (first) { 424 if (tf != NULL) { 425 int instr; 426 427 instr = db_get_value(pc, 4, FALSE); 428 if ((instr & 0xffffff) == 0x00e58955) { 429 /* pushl %ebp; movl %esp, %ebp */ 430 actframe = (void *)(get_esp(tf) - 4); 431 } else if ((instr & 0xffff) == 0x0000e589) { 432 /* movl %esp, %ebp */ 433 actframe = (void *)get_esp(tf); 434 if (tf->tf_ebp == 0) { 435 /* Fake frame better. */ 436 frame = actframe; 437 } 438 } else if ((instr & 0xff) == 0x000000c3) { 439 /* ret */ 440 actframe = (void *)(get_esp(tf) - 4); 441 } else if (offset == 0) { 442 /* Probably an assembler symbol. */ 443 actframe = (void *)(get_esp(tf) - 4); 444 } 445 } else if (strcmp(name, "fork_trampoline") == 0) { 446 /* 447 * Don't try to walk back on a stack for a 448 * process that hasn't actually been run yet. 449 */ 450 db_print_stack_entry(name, 0, 0, 0, pc); 451 break; 452 } 453 first = FALSE; 454 } 455 456 argp = &actframe->f_arg0; 457 narg = MAXNARG; 458 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { 459 argnp = argnames; 460 } else { 461 narg = db_numargs(frame); 462 } 463 464 db_print_stack_entry(name, narg, argnp, argp, pc); 465 466 if (actframe != frame) { 467 /* `frame' belongs to caller. */ 468 pc = (db_addr_t) 469 db_get_value((int)&actframe->f_retaddr, 4, FALSE); 470 continue; 471 } 472 473 db_nextframe(&frame, &pc, td); 474 475 if (INKERNEL((int)pc) && !INKERNEL((int) frame)) { 476 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 477 db_symbol_values(sym, &name, NULL); 478 db_print_stack_entry(name, 0, 0, 0, pc); 479 break; 480 } 481 if (!INKERNEL((int) frame)) { 482 break; 483 } 484 } 485 486 return (0); 487 } 488 489 void 490 db_trace_self(void) 491 { 492 struct i386_frame *frame; 493 db_addr_t callpc; 494 register_t ebp; 495 496 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 497 frame = (struct i386_frame *)ebp; 498 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE); 499 frame = frame->f_frame; 500 db_backtrace(curthread, NULL, frame, callpc, -1); 501 } 502 503 int 504 db_trace_thread(struct thread *thr, int count) 505 { 506 struct pcb *ctx; 507 508 ctx = kdb_thr_ctx(thr); 509 return (db_backtrace(thr, NULL, (struct i386_frame *)ctx->pcb_ebp, 510 ctx->pcb_eip, count)); 511 } 512 513 void 514 stack_save(struct stack *st) 515 { 516 struct i386_frame *frame; 517 vm_offset_t callpc; 518 register_t ebp; 519 520 stack_zero(st); 521 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 522 frame = (struct i386_frame *)ebp; 523 while (1) { 524 if (!INKERNEL(frame)) 525 break; 526 callpc = frame->f_retaddr; 527 if (!INKERNEL(callpc)) 528 break; 529 if (stack_put(st, callpc) == -1) 530 break; 531 if (frame->f_frame <= frame || 532 (vm_offset_t)frame->f_frame >= 533 (vm_offset_t)ebp + KSTACK_PAGES * PAGE_SIZE) 534 break; 535 frame = frame->f_frame; 536 } 537 } 538 539 int 540 i386_set_watch(watchnum, watchaddr, size, access, d) 541 int watchnum; 542 unsigned int watchaddr; 543 int size; 544 int access; 545 struct dbreg * d; 546 { 547 int i; 548 unsigned int mask; 549 550 if (watchnum == -1) { 551 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2) 552 if ((d->dr[7] & mask) == 0) 553 break; 554 if (i < 4) 555 watchnum = i; 556 else 557 return (-1); 558 } 559 560 switch (access) { 561 case DBREG_DR7_EXEC: 562 size = 1; /* size must be 1 for an execution breakpoint */ 563 /* fall through */ 564 case DBREG_DR7_WRONLY: 565 case DBREG_DR7_RDWR: 566 break; 567 default : return (-1); 568 } 569 570 /* 571 * we can watch a 1, 2, or 4 byte sized location 572 */ 573 switch (size) { 574 case 1 : mask = 0x00; break; 575 case 2 : mask = 0x01 << 2; break; 576 case 4 : mask = 0x03 << 2; break; 577 default : return (-1); 578 } 579 580 mask |= access; 581 582 /* clear the bits we are about to affect */ 583 d->dr[7] &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); 584 585 /* set drN register to the address, N=watchnum */ 586 DBREG_DRX(d,watchnum) = watchaddr; 587 588 /* enable the watchpoint */ 589 d->dr[7] |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16)); 590 591 return (watchnum); 592 } 593 594 595 int 596 i386_clr_watch(watchnum, d) 597 int watchnum; 598 struct dbreg * d; 599 { 600 601 if (watchnum < 0 || watchnum >= 4) 602 return (-1); 603 604 d->dr[7] = d->dr[7] & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); 605 DBREG_DRX(d,watchnum) = 0; 606 607 return (0); 608 } 609 610 611 int 612 db_md_set_watchpoint(addr, size) 613 db_expr_t addr; 614 db_expr_t size; 615 { 616 int avail, wsize; 617 int i; 618 struct dbreg d; 619 620 fill_dbregs(NULL, &d); 621 622 avail = 0; 623 for(i=0; i<4; i++) { 624 if ((d.dr[7] & (3 << (i*2))) == 0) 625 avail++; 626 } 627 628 if (avail*4 < size) 629 return (-1); 630 631 for (i=0; i<4 && (size != 0); i++) { 632 if ((d.dr[7] & (3<<(i*2))) == 0) { 633 if (size > 4) 634 wsize = 4; 635 else 636 wsize = size; 637 if (wsize == 3) 638 wsize++; 639 i386_set_watch(i, addr, wsize, 640 DBREG_DR7_WRONLY, &d); 641 addr += wsize; 642 size -= wsize; 643 } 644 } 645 646 set_dbregs(NULL, &d); 647 648 return(0); 649 } 650 651 652 int 653 db_md_clr_watchpoint(addr, size) 654 db_expr_t addr; 655 db_expr_t size; 656 { 657 int i; 658 struct dbreg d; 659 660 fill_dbregs(NULL, &d); 661 662 for(i=0; i<4; i++) { 663 if (d.dr[7] & (3 << (i*2))) { 664 if ((DBREG_DRX((&d), i) >= addr) && 665 (DBREG_DRX((&d), i) < addr+size)) 666 i386_clr_watch(i, &d); 667 668 } 669 } 670 671 set_dbregs(NULL, &d); 672 673 return(0); 674 } 675 676 677 static 678 char * 679 watchtype_str(type) 680 int type; 681 { 682 switch (type) { 683 case DBREG_DR7_EXEC : return "execute"; break; 684 case DBREG_DR7_RDWR : return "read/write"; break; 685 case DBREG_DR7_WRONLY : return "write"; break; 686 default : return "invalid"; break; 687 } 688 } 689 690 691 void 692 db_md_list_watchpoints() 693 { 694 int i; 695 struct dbreg d; 696 697 fill_dbregs(NULL, &d); 698 699 db_printf("\nhardware watchpoints:\n"); 700 db_printf(" watch status type len address\n"); 701 db_printf(" ----- -------- ---------- --- ----------\n"); 702 for (i=0; i<4; i++) { 703 if (d.dr[7] & (0x03 << (i*2))) { 704 unsigned type, len; 705 type = (d.dr[7] >> (16+(i*4))) & 3; 706 len = (d.dr[7] >> (16+(i*4)+2)) & 3; 707 db_printf(" %-5d %-8s %10s %3d 0x%08x\n", 708 i, "enabled", watchtype_str(type), 709 len+1, DBREG_DRX((&d),i)); 710 } 711 else { 712 db_printf(" %-5d disabled\n", i); 713 } 714 } 715 716 db_printf("\ndebug register values:\n"); 717 for (i=0; i<8; i++) { 718 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d),i)); 719 } 720 db_printf("\n"); 721 } 722 723
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