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/6.1/sys/i386/i386/db_trace.c 158179 2006-04-30 16:44:43Z cvs2svn $"); 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 int *argp; 207 int inst; 208 int args; 209 210 argp = (int *)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 < (int *)btext || argp >= (int *)etext) { 217 args = 5; 218 } else { 219 inst = db_get_value((int)argp, 4, FALSE); 220 if ((inst & 0xff) == 0x59) /* popl %ecx */ 221 args = 1; 222 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ 223 args = ((inst >> 16) & 0xff) / 4; 224 else 225 args = 5; 226 } 227 return (args); 228 } 229 230 static void 231 db_print_stack_entry(name, narg, argnp, argp, callpc) 232 const char *name; 233 int narg; 234 char **argnp; 235 int *argp; 236 db_addr_t callpc; 237 { 238 db_printf("%s(", name); 239 while (narg) { 240 if (argnp) 241 db_printf("%s=", *argnp++); 242 db_printf("%r", db_get_value((int)argp, 4, FALSE)); 243 argp++; 244 if (--narg != 0) 245 db_printf(","); 246 } 247 db_printf(") at "); 248 db_printsym(callpc, DB_STGY_PROC); 249 db_printf("\n"); 250 } 251 252 static void 253 decode_syscall(int number, struct thread *td) 254 { 255 struct proc *p; 256 c_db_sym_t sym; 257 db_expr_t diff; 258 sy_call_t *f; 259 const char *symname; 260 261 db_printf(" (%d", number); 262 p = (td != NULL) ? td->td_proc : NULL; 263 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) { 264 f = p->p_sysent->sv_table[number].sy_call; 265 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff); 266 if (sym != DB_SYM_NULL && diff == 0) { 267 db_symbol_values(sym, &symname, NULL); 268 db_printf(", %s, %s", p->p_sysent->sv_name, symname); 269 } 270 } 271 db_printf(")"); 272 } 273 274 /* 275 * Figure out the next frame up in the call stack. 276 */ 277 static void 278 db_nextframe(struct i386_frame **fp, db_addr_t *ip, struct thread *td) 279 { 280 struct trapframe *tf; 281 int frame_type; 282 int eip, esp, ebp; 283 db_expr_t offset; 284 c_db_sym_t sym; 285 const char *name; 286 287 eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE); 288 ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE); 289 290 /* 291 * Figure out frame type. We look at the address just before 292 * the saved instruction pointer as the saved EIP is after the 293 * call function, and if the function being called is marked as 294 * dead (such as panic() at the end of dblfault_handler()), then 295 * the instruction at the saved EIP will be part of a different 296 * function (syscall() in this example) rather than the one that 297 * actually made the call. 298 */ 299 frame_type = NORMAL; 300 sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset); 301 db_symbol_values(sym, &name, NULL); 302 if (name != NULL) { 303 if (strcmp(name, "calltrap") == 0 || 304 strcmp(name, "fork_trampoline") == 0) 305 frame_type = TRAP; 306 else if (strncmp(name, "Xatpic_intr", 11) == 0 || 307 strncmp(name, "Xapic_isr", 9) == 0) 308 frame_type = INTERRUPT; 309 else if (strcmp(name, "Xlcall_syscall") == 0 || 310 strcmp(name, "Xint0x80_syscall") == 0) 311 frame_type = SYSCALL; 312 else if (strcmp(name, "dblfault_handler") == 0) 313 frame_type = DOUBLE_FAULT; 314 } 315 316 /* 317 * Normal frames need no special processing. 318 */ 319 if (frame_type == NORMAL) { 320 *ip = (db_addr_t) eip; 321 *fp = (struct i386_frame *) ebp; 322 return; 323 } 324 325 db_print_stack_entry(name, 0, 0, 0, eip); 326 327 /* 328 * For a double fault, we have to snag the values from the 329 * previous TSS since a double fault uses a task gate to 330 * switch to a known good state. 331 */ 332 if (frame_type == DOUBLE_FAULT) { 333 esp = PCPU_GET(common_tss.tss_esp); 334 eip = PCPU_GET(common_tss.tss_eip); 335 ebp = PCPU_GET(common_tss.tss_ebp); 336 db_printf( 337 "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n", 338 eip, esp, ebp); 339 *ip = (db_addr_t) eip; 340 *fp = (struct i386_frame *) ebp; 341 return; 342 } 343 344 /* 345 * Point to base of trapframe which is just above the 346 * current frame. 347 */ 348 if (frame_type == INTERRUPT) 349 tf = (struct trapframe *)((int)*fp + 12); 350 else 351 tf = (struct trapframe *)((int)*fp + 8); 352 353 if (INKERNEL((int) tf)) { 354 esp = get_esp(tf); 355 eip = tf->tf_eip; 356 ebp = tf->tf_ebp; 357 switch (frame_type) { 358 case TRAP: 359 db_printf("--- trap %#r", tf->tf_trapno); 360 break; 361 case SYSCALL: 362 db_printf("--- syscall"); 363 decode_syscall(tf->tf_eax, td); 364 break; 365 case INTERRUPT: 366 db_printf("--- interrupt"); 367 break; 368 default: 369 panic("The moon has moved again."); 370 } 371 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip, 372 esp, ebp); 373 } 374 375 *ip = (db_addr_t) eip; 376 *fp = (struct i386_frame *) ebp; 377 } 378 379 static int 380 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame, 381 db_addr_t pc, int count) 382 { 383 struct i386_frame *actframe; 384 #define MAXNARG 16 385 char *argnames[MAXNARG], **argnp = NULL; 386 const char *name; 387 int *argp; 388 db_expr_t offset; 389 c_db_sym_t sym; 390 int narg, quit; 391 boolean_t first; 392 393 if (count == -1) 394 count = 1024; 395 396 first = TRUE; 397 quit = 0; 398 db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 399 while (count-- && !quit) { 400 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 401 db_symbol_values(sym, &name, NULL); 402 403 /* 404 * Attempt to determine a (possibly fake) frame that gives 405 * the caller's pc. It may differ from `frame' if the 406 * current function never sets up a standard frame or hasn't 407 * set one up yet or has just discarded one. The last two 408 * cases can be guessed fairly reliably for code generated 409 * by gcc. The first case is too much trouble to handle in 410 * general because the amount of junk on the stack depends 411 * on the pc (the special handling of "calltrap", etc. in 412 * db_nextframe() works because the `next' pc is special). 413 */ 414 actframe = frame; 415 if (first) { 416 if (tf != NULL) { 417 int instr; 418 419 instr = db_get_value(pc, 4, FALSE); 420 if ((instr & 0xffffff) == 0x00e58955) { 421 /* pushl %ebp; movl %esp, %ebp */ 422 actframe = (void *)(get_esp(tf) - 4); 423 } else if ((instr & 0xffff) == 0x0000e589) { 424 /* movl %esp, %ebp */ 425 actframe = (void *)get_esp(tf); 426 if (tf->tf_ebp == 0) { 427 /* Fake frame better. */ 428 frame = actframe; 429 } 430 } else if ((instr & 0xff) == 0x000000c3) { 431 /* ret */ 432 actframe = (void *)(get_esp(tf) - 4); 433 } else if (offset == 0) { 434 /* Probably an assembler symbol. */ 435 actframe = (void *)(get_esp(tf) - 4); 436 } 437 } else if (strcmp(name, "fork_trampoline") == 0) { 438 /* 439 * Don't try to walk back on a stack for a 440 * process that hasn't actually been run yet. 441 */ 442 db_print_stack_entry(name, 0, 0, 0, pc); 443 break; 444 } 445 first = FALSE; 446 } 447 448 argp = &actframe->f_arg0; 449 narg = MAXNARG; 450 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { 451 argnp = argnames; 452 } else { 453 narg = db_numargs(frame); 454 } 455 456 db_print_stack_entry(name, narg, argnp, argp, pc); 457 458 if (actframe != frame) { 459 /* `frame' belongs to caller. */ 460 pc = (db_addr_t) 461 db_get_value((int)&actframe->f_retaddr, 4, FALSE); 462 continue; 463 } 464 465 db_nextframe(&frame, &pc, td); 466 467 if (INKERNEL((int)pc) && !INKERNEL((int) frame)) { 468 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 469 db_symbol_values(sym, &name, NULL); 470 db_print_stack_entry(name, 0, 0, 0, pc); 471 break; 472 } 473 if (!INKERNEL((int) frame)) { 474 break; 475 } 476 } 477 478 return (0); 479 } 480 481 void 482 db_trace_self(void) 483 { 484 struct i386_frame *frame; 485 db_addr_t callpc; 486 register_t ebp; 487 488 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 489 frame = (struct i386_frame *)ebp; 490 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE); 491 frame = frame->f_frame; 492 db_backtrace(curthread, NULL, frame, callpc, -1); 493 } 494 495 int 496 db_trace_thread(struct thread *thr, int count) 497 { 498 struct pcb *ctx; 499 500 ctx = kdb_thr_ctx(thr); 501 return (db_backtrace(thr, NULL, (struct i386_frame *)ctx->pcb_ebp, 502 ctx->pcb_eip, count)); 503 } 504 505 void 506 stack_save(struct stack *st) 507 { 508 struct i386_frame *frame; 509 vm_offset_t callpc; 510 register_t ebp; 511 512 stack_zero(st); 513 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 514 frame = (struct i386_frame *)ebp; 515 while (1) { 516 if (!INKERNEL(frame)) 517 break; 518 callpc = frame->f_retaddr; 519 if (!INKERNEL(callpc)) 520 break; 521 if (stack_put(st, callpc) == -1) 522 break; 523 if (frame->f_frame <= frame || 524 (vm_offset_t)frame->f_frame >= 525 (vm_offset_t)ebp + KSTACK_PAGES * PAGE_SIZE) 526 break; 527 frame = frame->f_frame; 528 } 529 } 530 531 int 532 i386_set_watch(watchnum, watchaddr, size, access, d) 533 int watchnum; 534 unsigned int watchaddr; 535 int size; 536 int access; 537 struct dbreg * d; 538 { 539 int i; 540 unsigned int mask; 541 542 if (watchnum == -1) { 543 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2) 544 if ((d->dr[7] & mask) == 0) 545 break; 546 if (i < 4) 547 watchnum = i; 548 else 549 return (-1); 550 } 551 552 switch (access) { 553 case DBREG_DR7_EXEC: 554 size = 1; /* size must be 1 for an execution breakpoint */ 555 /* fall through */ 556 case DBREG_DR7_WRONLY: 557 case DBREG_DR7_RDWR: 558 break; 559 default : return (-1); 560 } 561 562 /* 563 * we can watch a 1, 2, or 4 byte sized location 564 */ 565 switch (size) { 566 case 1 : mask = 0x00; break; 567 case 2 : mask = 0x01 << 2; break; 568 case 4 : mask = 0x03 << 2; break; 569 default : return (-1); 570 } 571 572 mask |= access; 573 574 /* clear the bits we are about to affect */ 575 d->dr[7] &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); 576 577 /* set drN register to the address, N=watchnum */ 578 DBREG_DRX(d,watchnum) = watchaddr; 579 580 /* enable the watchpoint */ 581 d->dr[7] |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16)); 582 583 return (watchnum); 584 } 585 586 587 int 588 i386_clr_watch(watchnum, d) 589 int watchnum; 590 struct dbreg * d; 591 { 592 593 if (watchnum < 0 || watchnum >= 4) 594 return (-1); 595 596 d->dr[7] = d->dr[7] & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); 597 DBREG_DRX(d,watchnum) = 0; 598 599 return (0); 600 } 601 602 603 int 604 db_md_set_watchpoint(addr, size) 605 db_expr_t addr; 606 db_expr_t size; 607 { 608 int avail, wsize; 609 int i; 610 struct dbreg d; 611 612 fill_dbregs(NULL, &d); 613 614 avail = 0; 615 for(i=0; i<4; i++) { 616 if ((d.dr[7] & (3 << (i*2))) == 0) 617 avail++; 618 } 619 620 if (avail*4 < size) 621 return (-1); 622 623 for (i=0; i<4 && (size != 0); i++) { 624 if ((d.dr[7] & (3<<(i*2))) == 0) { 625 if (size > 4) 626 wsize = 4; 627 else 628 wsize = size; 629 if (wsize == 3) 630 wsize++; 631 i386_set_watch(i, addr, wsize, 632 DBREG_DR7_WRONLY, &d); 633 addr += wsize; 634 size -= wsize; 635 } 636 } 637 638 set_dbregs(NULL, &d); 639 640 return(0); 641 } 642 643 644 int 645 db_md_clr_watchpoint(addr, size) 646 db_expr_t addr; 647 db_expr_t size; 648 { 649 int i; 650 struct dbreg d; 651 652 fill_dbregs(NULL, &d); 653 654 for(i=0; i<4; i++) { 655 if (d.dr[7] & (3 << (i*2))) { 656 if ((DBREG_DRX((&d), i) >= addr) && 657 (DBREG_DRX((&d), i) < addr+size)) 658 i386_clr_watch(i, &d); 659 660 } 661 } 662 663 set_dbregs(NULL, &d); 664 665 return(0); 666 } 667 668 669 static 670 char * 671 watchtype_str(type) 672 int type; 673 { 674 switch (type) { 675 case DBREG_DR7_EXEC : return "execute"; break; 676 case DBREG_DR7_RDWR : return "read/write"; break; 677 case DBREG_DR7_WRONLY : return "write"; break; 678 default : return "invalid"; break; 679 } 680 } 681 682 683 void 684 db_md_list_watchpoints() 685 { 686 int i; 687 struct dbreg d; 688 689 fill_dbregs(NULL, &d); 690 691 db_printf("\nhardware watchpoints:\n"); 692 db_printf(" watch status type len address\n"); 693 db_printf(" ----- -------- ---------- --- ----------\n"); 694 for (i=0; i<4; i++) { 695 if (d.dr[7] & (0x03 << (i*2))) { 696 unsigned type, len; 697 type = (d.dr[7] >> (16+(i*4))) & 3; 698 len = (d.dr[7] >> (16+(i*4)+2)) & 3; 699 db_printf(" %-5d %-8s %10s %3d 0x%08x\n", 700 i, "enabled", watchtype_str(type), 701 len+1, DBREG_DRX((&d),i)); 702 } 703 else { 704 db_printf(" %-5d disabled\n", i); 705 } 706 } 707 708 db_printf("\ndebug register values:\n"); 709 for (i=0; i<8; i++) { 710 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d),i)); 711 } 712 db_printf("\n"); 713 } 714 715
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