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/12.0/sys/i386/i386/db_trace.c 332564 2018-04-16 13:52:40Z imp $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kdb.h> 33 #include <sys/proc.h> 34 #include <sys/sysent.h> 35 36 #include <machine/cpu.h> 37 #include <machine/frame.h> 38 #include <machine/md_var.h> 39 #include <machine/pcb.h> 40 #include <machine/reg.h> 41 #include <machine/stack.h> 42 43 #include <vm/vm.h> 44 #include <vm/vm_param.h> 45 #include <vm/pmap.h> 46 47 #include <ddb/ddb.h> 48 #include <ddb/db_access.h> 49 #include <ddb/db_sym.h> 50 #include <ddb/db_variables.h> 51 52 static db_varfcn_t db_esp; 53 static db_varfcn_t db_frame; 54 static db_varfcn_t db_frame_seg; 55 static db_varfcn_t db_gs; 56 static db_varfcn_t db_ss; 57 58 /* 59 * Machine register set. 60 */ 61 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x) 62 struct db_variable db_regs[] = { 63 { "cs", DB_OFFSET(tf_cs), db_frame_seg }, 64 { "ds", DB_OFFSET(tf_ds), db_frame_seg }, 65 { "es", DB_OFFSET(tf_es), db_frame_seg }, 66 { "fs", DB_OFFSET(tf_fs), db_frame_seg }, 67 { "gs", NULL, db_gs }, 68 { "ss", NULL, db_ss }, 69 { "eax", DB_OFFSET(tf_eax), db_frame }, 70 { "ecx", DB_OFFSET(tf_ecx), db_frame }, 71 { "edx", DB_OFFSET(tf_edx), db_frame }, 72 { "ebx", DB_OFFSET(tf_ebx), db_frame }, 73 { "esp", NULL, db_esp }, 74 { "ebp", DB_OFFSET(tf_ebp), db_frame }, 75 { "esi", DB_OFFSET(tf_esi), db_frame }, 76 { "edi", DB_OFFSET(tf_edi), db_frame }, 77 { "eip", DB_OFFSET(tf_eip), db_frame }, 78 { "efl", DB_OFFSET(tf_eflags), db_frame }, 79 }; 80 struct db_variable *db_eregs = db_regs + nitems(db_regs); 81 82 static __inline int 83 get_esp(struct trapframe *tf) 84 { 85 return (TF_HAS_STACKREGS(tf) ? tf->tf_esp : (intptr_t)&tf->tf_esp); 86 } 87 88 static int 89 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 90 { 91 int *reg; 92 93 if (kdb_frame == NULL) 94 return (0); 95 96 reg = (int *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep); 97 if (op == DB_VAR_GET) 98 *valuep = *reg; 99 else 100 *reg = *valuep; 101 return (1); 102 } 103 104 static int 105 db_frame_seg(struct db_variable *vp, db_expr_t *valuep, int op) 106 { 107 struct trapframe_vm86 *tfp; 108 int off; 109 uint16_t *reg; 110 111 if (kdb_frame == NULL) 112 return (0); 113 114 off = (intptr_t)vp->valuep; 115 if (kdb_frame->tf_eflags & PSL_VM) { 116 tfp = (void *)kdb_frame; 117 switch ((intptr_t)vp->valuep) { 118 case (intptr_t)DB_OFFSET(tf_cs): 119 reg = (uint16_t *)&tfp->tf_cs; 120 break; 121 case (intptr_t)DB_OFFSET(tf_ds): 122 reg = (uint16_t *)&tfp->tf_vm86_ds; 123 break; 124 case (intptr_t)DB_OFFSET(tf_es): 125 reg = (uint16_t *)&tfp->tf_vm86_es; 126 break; 127 case (intptr_t)DB_OFFSET(tf_fs): 128 reg = (uint16_t *)&tfp->tf_vm86_fs; 129 break; 130 } 131 } else 132 reg = (uint16_t *)((uintptr_t)kdb_frame + off); 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 (TF_HAS_STACKREGS(kdb_frame)) 150 kdb_frame->tf_esp = *valuep; 151 return (1); 152 } 153 154 static int 155 db_gs(struct db_variable *vp, db_expr_t *valuep, int op) 156 { 157 struct trapframe_vm86 *tfp; 158 159 if (kdb_frame != NULL && kdb_frame->tf_eflags & PSL_VM) { 160 tfp = (void *)kdb_frame; 161 if (op == DB_VAR_GET) 162 *valuep = tfp->tf_vm86_gs; 163 else 164 tfp->tf_vm86_gs = *valuep; 165 return (1); 166 } 167 if (op == DB_VAR_GET) 168 *valuep = rgs(); 169 else 170 load_gs(*valuep); 171 return (1); 172 } 173 174 static int 175 db_ss(struct db_variable *vp, db_expr_t *valuep, int op) 176 { 177 178 if (kdb_frame == NULL) 179 return (0); 180 181 if (op == DB_VAR_GET) 182 *valuep = TF_HAS_STACKREGS(kdb_frame) ? kdb_frame->tf_ss : 183 rss(); 184 else if (TF_HAS_STACKREGS(kdb_frame)) 185 kdb_frame->tf_ss = *valuep; 186 return (1); 187 } 188 189 #define NORMAL 0 190 #define TRAP 1 191 #define INTERRUPT 2 192 #define SYSCALL 3 193 #define DOUBLE_FAULT 4 194 #define TRAP_INTERRUPT 5 195 #define TRAP_TIMERINT 6 196 197 static void db_nextframe(struct i386_frame **, db_addr_t *, struct thread *); 198 static int db_numargs(struct i386_frame *); 199 static void db_print_stack_entry(const char *, int, char **, int *, db_addr_t, 200 void *); 201 static void decode_syscall(int, struct thread *); 202 203 static const char * watchtype_str(int type); 204 int i386_set_watch(int watchnum, unsigned int watchaddr, int size, int access, 205 struct dbreg *d); 206 int i386_clr_watch(int watchnum, struct dbreg *d); 207 208 /* 209 * Figure out how many arguments were passed into the frame at "fp". 210 */ 211 static int 212 db_numargs(fp) 213 struct i386_frame *fp; 214 { 215 char *argp; 216 int inst; 217 int args; 218 219 argp = (char *)db_get_value((int)&fp->f_retaddr, 4, false); 220 /* 221 * XXX etext is wrong for LKMs. We should attempt to interpret 222 * the instruction at the return address in all cases. This 223 * may require better fault handling. 224 */ 225 if (argp < btext || argp >= etext) { 226 args = -1; 227 } else { 228 retry: 229 inst = db_get_value((int)argp, 4, false); 230 if ((inst & 0xff) == 0x59) /* popl %ecx */ 231 args = 1; 232 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ 233 args = ((inst >> 16) & 0xff) / 4; 234 else if ((inst & 0xf8ff) == 0xc089) { /* movl %eax, %Reg */ 235 argp += 2; 236 goto retry; 237 } else 238 args = -1; 239 } 240 return (args); 241 } 242 243 static void 244 db_print_stack_entry(name, narg, argnp, argp, callpc, frame) 245 const char *name; 246 int narg; 247 char **argnp; 248 int *argp; 249 db_addr_t callpc; 250 void *frame; 251 { 252 int n = narg >= 0 ? narg : 5; 253 254 db_printf("%s(", name); 255 while (n) { 256 if (argnp) 257 db_printf("%s=", *argnp++); 258 db_printf("%r", db_get_value((int)argp, 4, false)); 259 argp++; 260 if (--n != 0) 261 db_printf(","); 262 } 263 if (narg < 0) 264 db_printf(",..."); 265 db_printf(") at "); 266 db_printsym(callpc, DB_STGY_PROC); 267 if (frame != NULL) 268 db_printf("/frame 0x%r", (register_t)frame); 269 db_printf("\n"); 270 } 271 272 static void 273 decode_syscall(int number, struct thread *td) 274 { 275 struct proc *p; 276 c_db_sym_t sym; 277 db_expr_t diff; 278 sy_call_t *f; 279 const char *symname; 280 281 db_printf(" (%d", number); 282 p = (td != NULL) ? td->td_proc : NULL; 283 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) { 284 f = p->p_sysent->sv_table[number].sy_call; 285 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff); 286 if (sym != DB_SYM_NULL && diff == 0) { 287 db_symbol_values(sym, &symname, NULL); 288 db_printf(", %s, %s", p->p_sysent->sv_name, symname); 289 } 290 } 291 db_printf(")"); 292 } 293 294 /* 295 * Figure out the next frame up in the call stack. 296 */ 297 static void 298 db_nextframe(struct i386_frame **fp, db_addr_t *ip, struct thread *td) 299 { 300 struct trapframe *tf; 301 int frame_type; 302 int eip, esp, ebp; 303 db_expr_t offset; 304 c_db_sym_t sym; 305 const char *name; 306 307 eip = db_get_value((int) &(*fp)->f_retaddr, 4, false); 308 ebp = db_get_value((int) &(*fp)->f_frame, 4, false); 309 310 /* 311 * Figure out frame type. We look at the address just before 312 * the saved instruction pointer as the saved EIP is after the 313 * call function, and if the function being called is marked as 314 * dead (such as panic() at the end of dblfault_handler()), then 315 * the instruction at the saved EIP will be part of a different 316 * function (syscall() in this example) rather than the one that 317 * actually made the call. 318 */ 319 frame_type = NORMAL; 320 if (eip >= PMAP_TRM_MIN_ADDRESS) { 321 sym = db_search_symbol(eip - 1 - setidt_disp, DB_STGY_ANY, 322 &offset); 323 } else { 324 sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset); 325 } 326 db_symbol_values(sym, &name, NULL); 327 if (name != NULL) { 328 if (strcmp(name, "calltrap") == 0 || 329 strcmp(name, "fork_trampoline") == 0) 330 frame_type = TRAP; 331 else if (strncmp(name, "Xatpic_intr", 11) == 0 || 332 strncmp(name, "Xapic_isr", 9) == 0) 333 frame_type = INTERRUPT; 334 else if (strcmp(name, "Xlcall_syscall") == 0 || 335 strcmp(name, "Xint0x80_syscall") == 0) 336 frame_type = SYSCALL; 337 else if (strcmp(name, "dblfault_handler") == 0) 338 frame_type = DOUBLE_FAULT; 339 /* XXX: These are interrupts with trap frames. */ 340 else if (strcmp(name, "Xtimerint") == 0) 341 frame_type = TRAP_TIMERINT; 342 else if (strcmp(name, "Xcpustop") == 0 || 343 strcmp(name, "Xrendezvous") == 0 || 344 strcmp(name, "Xipi_intr_bitmap_handler") == 0) 345 frame_type = TRAP_INTERRUPT; 346 } 347 348 /* 349 * Normal frames need no special processing. 350 */ 351 if (frame_type == NORMAL) { 352 *ip = (db_addr_t) eip; 353 *fp = (struct i386_frame *) ebp; 354 return; 355 } 356 357 db_print_stack_entry(name, 0, 0, 0, eip, &(*fp)->f_frame); 358 359 /* 360 * For a double fault, we have to snag the values from the 361 * previous TSS since a double fault uses a task gate to 362 * switch to a known good state. 363 */ 364 if (frame_type == DOUBLE_FAULT) { 365 esp = PCPU_GET(common_tssp)->tss_esp; 366 eip = PCPU_GET(common_tssp)->tss_eip; 367 ebp = PCPU_GET(common_tssp)->tss_ebp; 368 db_printf( 369 "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n", 370 eip, esp, ebp); 371 *ip = (db_addr_t) eip; 372 *fp = (struct i386_frame *) ebp; 373 return; 374 } 375 376 /* 377 * Point to base of trapframe which is just above the 378 * current frame. 379 */ 380 if (frame_type == INTERRUPT) 381 tf = (struct trapframe *)((int)*fp + 16); 382 else if (frame_type == TRAP_INTERRUPT) 383 tf = (struct trapframe *)((int)*fp + 8); 384 else 385 tf = (struct trapframe *)((int)*fp + 12); 386 387 esp = get_esp(tf); 388 eip = tf->tf_eip; 389 ebp = tf->tf_ebp; 390 switch (frame_type) { 391 case TRAP: 392 db_printf("--- trap %#r", tf->tf_trapno); 393 break; 394 case SYSCALL: 395 db_printf("--- syscall"); 396 decode_syscall(tf->tf_eax, td); 397 break; 398 case TRAP_TIMERINT: 399 case TRAP_INTERRUPT: 400 case INTERRUPT: 401 db_printf("--- interrupt"); 402 break; 403 default: 404 panic("The moon has moved again."); 405 } 406 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip, esp, ebp); 407 408 switch (frame_type) { 409 case TRAP: 410 case TRAP_TIMERINT: 411 case TRAP_INTERRUPT: 412 case INTERRUPT: 413 if ((tf->tf_eflags & PSL_VM) != 0 || 414 (tf->tf_cs & SEL_RPL_MASK) != 0) 415 ebp = 0; 416 break; 417 case SYSCALL: 418 ebp = 0; 419 break; 420 } 421 422 *ip = (db_addr_t) eip; 423 *fp = (struct i386_frame *) ebp; 424 } 425 426 static int 427 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame, 428 db_addr_t pc, register_t sp, int count) 429 { 430 struct i386_frame *actframe; 431 #define MAXNARG 16 432 char *argnames[MAXNARG], **argnp = NULL; 433 const char *name; 434 int *argp; 435 db_expr_t offset; 436 c_db_sym_t sym; 437 int instr, narg; 438 bool first; 439 440 if (db_segsize(tf) == 16) { 441 db_printf( 442 "--- 16-bit%s, cs:eip = %#x:%#x, ss:esp = %#x:%#x, ebp = %#x, tf = %p ---\n", 443 (tf->tf_eflags & PSL_VM) ? " (vm86)" : "", 444 tf->tf_cs, tf->tf_eip, 445 TF_HAS_STACKREGS(tf) ? tf->tf_ss : rss(), 446 TF_HAS_STACKREGS(tf) ? tf->tf_esp : (intptr_t)&tf->tf_esp, 447 tf->tf_ebp, tf); 448 return (0); 449 } 450 451 /* 'frame' can be null initially. Just print the pc then. */ 452 if (frame == NULL) 453 goto out; 454 455 /* 456 * If an indirect call via an invalid pointer caused a trap, 457 * %pc contains the invalid address while the return address 458 * of the unlucky caller has been saved by CPU on the stack 459 * just before the trap frame. In this case, try to recover 460 * the caller's address so that the first frame is assigned 461 * to the right spot in the right function, for that is where 462 * the failure actually happened. 463 * 464 * This trick depends on the fault address stashed in tf_err 465 * by trap_fatal() before entering KDB. 466 */ 467 if (kdb_frame && pc == kdb_frame->tf_err) { 468 /* 469 * Find where the trap frame actually ends. 470 * It won't contain tf_esp or tf_ss unless crossing rings. 471 */ 472 if (TF_HAS_STACKREGS(kdb_frame)) 473 instr = (int)(kdb_frame + 1); 474 else 475 instr = (int)&kdb_frame->tf_esp; 476 pc = db_get_value(instr, 4, false); 477 } 478 479 if (count == -1) 480 count = 1024; 481 482 first = true; 483 while (count-- && !db_pager_quit) { 484 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 485 db_symbol_values(sym, &name, NULL); 486 487 /* 488 * Attempt to determine a (possibly fake) frame that gives 489 * the caller's pc. It may differ from `frame' if the 490 * current function never sets up a standard frame or hasn't 491 * set one up yet or has just discarded one. The last two 492 * cases can be guessed fairly reliably for code generated 493 * by gcc. The first case is too much trouble to handle in 494 * general because the amount of junk on the stack depends 495 * on the pc (the special handling of "calltrap", etc. in 496 * db_nextframe() works because the `next' pc is special). 497 */ 498 actframe = frame; 499 if (first) { 500 first = false; 501 if (sym == C_DB_SYM_NULL && sp != 0) { 502 /* 503 * If a symbol couldn't be found, we've probably 504 * jumped to a bogus location, so try and use 505 * the return address to find our caller. 506 */ 507 db_print_stack_entry(name, 0, 0, 0, pc, 508 NULL); 509 pc = db_get_value(sp, 4, false); 510 if (db_search_symbol(pc, DB_STGY_PROC, 511 &offset) == C_DB_SYM_NULL) 512 break; 513 continue; 514 } else if (tf != NULL) { 515 instr = db_get_value(pc, 4, false); 516 if ((instr & 0xffffff) == 0x00e58955) { 517 /* pushl %ebp; movl %esp, %ebp */ 518 actframe = (void *)(get_esp(tf) - 4); 519 } else if ((instr & 0xffff) == 0x0000e589) { 520 /* movl %esp, %ebp */ 521 actframe = (void *)get_esp(tf); 522 if (tf->tf_ebp == 0) { 523 /* Fake frame better. */ 524 frame = actframe; 525 } 526 } else if ((instr & 0xff) == 0x000000c3) { 527 /* ret */ 528 actframe = (void *)(get_esp(tf) - 4); 529 } else if (offset == 0) { 530 /* Probably an assembler symbol. */ 531 actframe = (void *)(get_esp(tf) - 4); 532 } 533 } else if (strcmp(name, "fork_trampoline") == 0) { 534 /* 535 * Don't try to walk back on a stack for a 536 * process that hasn't actually been run yet. 537 */ 538 db_print_stack_entry(name, 0, 0, 0, pc, 539 actframe); 540 break; 541 } 542 } 543 544 argp = &actframe->f_arg0; 545 narg = MAXNARG; 546 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { 547 argnp = argnames; 548 } else { 549 narg = db_numargs(frame); 550 } 551 552 db_print_stack_entry(name, narg, argnp, argp, pc, actframe); 553 554 if (actframe != frame) { 555 /* `frame' belongs to caller. */ 556 pc = (db_addr_t) 557 db_get_value((int)&actframe->f_retaddr, 4, false); 558 continue; 559 } 560 561 db_nextframe(&frame, &pc, td); 562 563 out: 564 /* 565 * 'frame' can be null here, either because it was initially 566 * null or because db_nextframe() found no frame. 567 * db_nextframe() may also have found a non-kernel frame. 568 * !INKERNEL() classifies both. Stop tracing if either, 569 * after printing the pc if it is the kernel. 570 */ 571 if (frame == NULL || frame <= actframe) { 572 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 573 db_symbol_values(sym, &name, NULL); 574 db_print_stack_entry(name, 0, 0, 0, pc, frame); 575 break; 576 } 577 } 578 579 return (0); 580 } 581 582 void 583 db_trace_self(void) 584 { 585 struct i386_frame *frame; 586 db_addr_t callpc; 587 register_t ebp; 588 589 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 590 frame = (struct i386_frame *)ebp; 591 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, false); 592 frame = frame->f_frame; 593 db_backtrace(curthread, NULL, frame, callpc, 0, -1); 594 } 595 596 int 597 db_trace_thread(struct thread *thr, int count) 598 { 599 struct pcb *ctx; 600 struct trapframe *tf; 601 602 ctx = kdb_thr_ctx(thr); 603 tf = thr == kdb_thread ? kdb_frame : NULL; 604 return (db_backtrace(thr, tf, (struct i386_frame *)ctx->pcb_ebp, 605 ctx->pcb_eip, ctx->pcb_esp, count)); 606 } 607 608 int 609 i386_set_watch(watchnum, watchaddr, size, access, d) 610 int watchnum; 611 unsigned int watchaddr; 612 int size; 613 int access; 614 struct dbreg *d; 615 { 616 int i, len; 617 618 if (watchnum == -1) { 619 for (i = 0; i < 4; i++) 620 if (!DBREG_DR7_ENABLED(d->dr[7], i)) 621 break; 622 if (i < 4) 623 watchnum = i; 624 else 625 return (-1); 626 } 627 628 switch (access) { 629 case DBREG_DR7_EXEC: 630 size = 1; /* size must be 1 for an execution breakpoint */ 631 /* fall through */ 632 case DBREG_DR7_WRONLY: 633 case DBREG_DR7_RDWR: 634 break; 635 default: 636 return (-1); 637 } 638 639 /* 640 * we can watch a 1, 2, or 4 byte sized location 641 */ 642 switch (size) { 643 case 1: 644 len = DBREG_DR7_LEN_1; 645 break; 646 case 2: 647 len = DBREG_DR7_LEN_2; 648 break; 649 case 4: 650 len = DBREG_DR7_LEN_4; 651 break; 652 default: 653 return (-1); 654 } 655 656 /* clear the bits we are about to affect */ 657 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 658 659 /* set drN register to the address, N=watchnum */ 660 DBREG_DRX(d, watchnum) = watchaddr; 661 662 /* enable the watchpoint */ 663 d->dr[7] |= DBREG_DR7_SET(watchnum, len, access, 664 DBREG_DR7_GLOBAL_ENABLE); 665 666 return (watchnum); 667 } 668 669 670 int 671 i386_clr_watch(watchnum, d) 672 int watchnum; 673 struct dbreg *d; 674 { 675 676 if (watchnum < 0 || watchnum >= 4) 677 return (-1); 678 679 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 680 DBREG_DRX(d, watchnum) = 0; 681 682 return (0); 683 } 684 685 686 int 687 db_md_set_watchpoint(addr, size) 688 db_expr_t addr; 689 db_expr_t size; 690 { 691 struct dbreg d; 692 int avail, i, wsize; 693 694 fill_dbregs(NULL, &d); 695 696 avail = 0; 697 for(i = 0; i < 4; i++) { 698 if (!DBREG_DR7_ENABLED(d.dr[7], i)) 699 avail++; 700 } 701 702 if (avail * 4 < size) 703 return (-1); 704 705 for (i = 0; i < 4 && (size > 0); i++) { 706 if (!DBREG_DR7_ENABLED(d.dr[7], i)) { 707 if (size > 2) 708 wsize = 4; 709 else 710 wsize = size; 711 i386_set_watch(i, addr, wsize, 712 DBREG_DR7_WRONLY, &d); 713 addr += wsize; 714 size -= wsize; 715 } 716 } 717 718 set_dbregs(NULL, &d); 719 720 return(0); 721 } 722 723 724 int 725 db_md_clr_watchpoint(addr, size) 726 db_expr_t addr; 727 db_expr_t size; 728 { 729 struct dbreg d; 730 int i; 731 732 fill_dbregs(NULL, &d); 733 734 for(i = 0; i < 4; i++) { 735 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 736 if ((DBREG_DRX((&d), i) >= addr) && 737 (DBREG_DRX((&d), i) < addr+size)) 738 i386_clr_watch(i, &d); 739 740 } 741 } 742 743 set_dbregs(NULL, &d); 744 745 return(0); 746 } 747 748 749 static const char * 750 watchtype_str(type) 751 int type; 752 { 753 switch (type) { 754 case DBREG_DR7_EXEC : return "execute"; break; 755 case DBREG_DR7_RDWR : return "read/write"; break; 756 case DBREG_DR7_WRONLY : return "write"; break; 757 default : return "invalid"; break; 758 } 759 } 760 761 762 void 763 db_md_list_watchpoints(void) 764 { 765 struct dbreg d; 766 int i, len, type; 767 768 fill_dbregs(NULL, &d); 769 770 db_printf("\nhardware watchpoints:\n"); 771 db_printf(" watch status type len address\n"); 772 db_printf(" ----- -------- ---------- --- ----------\n"); 773 for (i = 0; i < 4; i++) { 774 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 775 type = DBREG_DR7_ACCESS(d.dr[7], i); 776 len = DBREG_DR7_LEN(d.dr[7], i); 777 db_printf(" %-5d %-8s %10s %3d ", 778 i, "enabled", watchtype_str(type), len + 1); 779 db_printsym((db_addr_t)DBREG_DRX(&d, i), DB_STGY_ANY); 780 db_printf("\n"); 781 } else { 782 db_printf(" %-5d disabled\n", i); 783 } 784 } 785 786 db_printf("\ndebug register values:\n"); 787 for (i = 0; i < 8; i++) 788 if (i != 4 && i != 5) 789 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX(&d, i)); 790 db_printf("\n"); 791 }
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