Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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("$FreeBSD$"); 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 4 194 195 static void db_nextframe(struct i386_frame **, db_addr_t *, struct thread *); 196 static int db_numargs(struct i386_frame *); 197 static void db_print_stack_entry(const char *, int, char **, int *, db_addr_t, 198 void *); 199 static void decode_syscall(int, struct thread *); 200 201 static const char * watchtype_str(int type); 202 int i386_set_watch(int watchnum, unsigned int watchaddr, int size, int access, 203 struct dbreg *d); 204 int i386_clr_watch(int watchnum, struct dbreg *d); 205 206 /* 207 * Figure out how many arguments were passed into the frame at "fp". 208 */ 209 static int 210 db_numargs(fp) 211 struct i386_frame *fp; 212 { 213 char *argp; 214 int inst; 215 int args; 216 217 argp = (char *)db_get_value((int)&fp->f_retaddr, 4, false); 218 /* 219 * XXX etext is wrong for LKMs. We should attempt to interpret 220 * the instruction at the return address in all cases. This 221 * may require better fault handling. 222 */ 223 if (argp < btext || argp >= etext) { 224 args = -1; 225 } else { 226 retry: 227 inst = db_get_value((int)argp, 4, false); 228 if ((inst & 0xff) == 0x59) /* popl %ecx */ 229 args = 1; 230 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ 231 args = ((inst >> 16) & 0xff) / 4; 232 else if ((inst & 0xf8ff) == 0xc089) { /* movl %eax, %Reg */ 233 argp += 2; 234 goto retry; 235 } else 236 args = -1; 237 } 238 return (args); 239 } 240 241 static void 242 db_print_stack_entry(name, narg, argnp, argp, callpc, frame) 243 const char *name; 244 int narg; 245 char **argnp; 246 int *argp; 247 db_addr_t callpc; 248 void *frame; 249 { 250 int n = narg >= 0 ? narg : 5; 251 252 db_printf("%s(", name); 253 while (n) { 254 if (argnp) 255 db_printf("%s=", *argnp++); 256 db_printf("%r", db_get_value((int)argp, 4, false)); 257 argp++; 258 if (--n != 0) 259 db_printf(","); 260 } 261 if (narg < 0) 262 db_printf(",..."); 263 db_printf(") at "); 264 db_printsym(callpc, DB_STGY_PROC); 265 if (frame != NULL) 266 db_printf("/frame 0x%r", (register_t)frame); 267 db_printf("\n"); 268 } 269 270 static void 271 decode_syscall(int number, struct thread *td) 272 { 273 struct proc *p; 274 c_db_sym_t sym; 275 db_expr_t diff; 276 sy_call_t *f; 277 const char *symname; 278 279 db_printf(" (%d", number); 280 p = (td != NULL) ? td->td_proc : NULL; 281 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) { 282 f = p->p_sysent->sv_table[number].sy_call; 283 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff); 284 if (sym != DB_SYM_NULL && diff == 0) { 285 db_symbol_values(sym, &symname, NULL); 286 db_printf(", %s, %s", p->p_sysent->sv_name, symname); 287 } 288 } 289 db_printf(")"); 290 } 291 292 /* 293 * Figure out the next frame up in the call stack. 294 */ 295 static void 296 db_nextframe(struct i386_frame **fp, db_addr_t *ip, struct thread *td) 297 { 298 struct trapframe *tf; 299 int frame_type; 300 int eip, esp, ebp; 301 db_expr_t offset; 302 c_db_sym_t sym; 303 const char *name; 304 305 eip = db_get_value((int) &(*fp)->f_retaddr, 4, false); 306 ebp = db_get_value((int) &(*fp)->f_frame, 4, false); 307 308 /* 309 * Figure out frame type. We look at the address just before 310 * the saved instruction pointer as the saved EIP is after the 311 * call function, and if the function being called is marked as 312 * dead (such as panic() at the end of dblfault_handler()), then 313 * the instruction at the saved EIP will be part of a different 314 * function (syscall() in this example) rather than the one that 315 * actually made the call. 316 */ 317 frame_type = NORMAL; 318 319 if (eip >= PMAP_TRM_MIN_ADDRESS) { 320 sym = db_search_symbol(eip - 1 - setidt_disp, DB_STGY_ANY, 321 &offset); 322 } else { 323 sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset); 324 } 325 db_symbol_values(sym, &name, NULL); 326 if (name != NULL) { 327 if (strcmp(name, "calltrap") == 0 || 328 strcmp(name, "fork_trampoline") == 0) 329 frame_type = TRAP; 330 else if (strncmp(name, "Xatpic_intr", 11) == 0 || 331 strncmp(name, "Xapic_isr", 9) == 0) { 332 frame_type = INTERRUPT; 333 } else if (strcmp(name, "Xlcall_syscall") == 0 || 334 strcmp(name, "Xint0x80_syscall") == 0) 335 frame_type = SYSCALL; 336 else if (strcmp(name, "dblfault_handler") == 0) 337 frame_type = DOUBLE_FAULT; 338 else if (strcmp(name, "Xtimerint") == 0 || 339 strcmp(name, "Xxen_intr_upcall") == 0) 340 frame_type = INTERRUPT; 341 else if (strcmp(name, "Xcpustop") == 0 || 342 strcmp(name, "Xrendezvous") == 0 || 343 strcmp(name, "Xipi_intr_bitmap_handler") == 0) { 344 /* No arguments. */ 345 frame_type = INTERRUPT; 346 } 347 } 348 349 /* 350 * Normal frames need no special processing. 351 */ 352 if (frame_type == NORMAL) { 353 *ip = (db_addr_t) eip; 354 *fp = (struct i386_frame *) ebp; 355 return; 356 } 357 358 db_print_stack_entry(name, 0, 0, 0, eip, &(*fp)->f_frame); 359 360 /* 361 * For a double fault, we have to snag the values from the 362 * previous TSS since a double fault uses a task gate to 363 * switch to a known good state. 364 */ 365 if (frame_type == DOUBLE_FAULT) { 366 esp = PCPU_GET(common_tssp)->tss_esp; 367 eip = PCPU_GET(common_tssp)->tss_eip; 368 ebp = PCPU_GET(common_tssp)->tss_ebp; 369 db_printf( 370 "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n", 371 eip, esp, ebp); 372 *ip = (db_addr_t) eip; 373 *fp = (struct i386_frame *) ebp; 374 return; 375 } 376 377 /* 378 * Point to base of trapframe which is just above the current 379 * frame. Pointer to it was put into %ebp by the kernel entry 380 * code. 381 */ 382 tf = (struct trapframe *)(*fp)->f_frame; 383 384 /* 385 * This can be the case for e.g. fork_trampoline, last frame 386 * of a kernel thread stack. 387 */ 388 if (tf == NULL) { 389 *ip = 0; 390 *fp = 0; 391 db_printf("--- kthread start\n"); 392 return; 393 } 394 395 esp = get_esp(tf); 396 eip = tf->tf_eip; 397 ebp = tf->tf_ebp; 398 switch (frame_type) { 399 case TRAP: 400 db_printf("--- trap %#r", tf->tf_trapno); 401 break; 402 case SYSCALL: 403 db_printf("--- syscall"); 404 decode_syscall(tf->tf_eax, td); 405 break; 406 case INTERRUPT: 407 db_printf("--- interrupt"); 408 break; 409 default: 410 panic("The moon has moved again."); 411 } 412 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip, esp, ebp); 413 414 /* 415 * Detect the last (trap) frame on the kernel stack, where we 416 * entered kernel from usermode. Terminate tracing in this 417 * case. 418 */ 419 switch (frame_type) { 420 case TRAP: 421 case INTERRUPT: 422 if (!TRAPF_USERMODE(tf)) 423 break; 424 /* FALLTHROUGH */ 425 case SYSCALL: 426 ebp = 0; 427 eip = 0; 428 break; 429 } 430 431 *ip = (db_addr_t) eip; 432 *fp = (struct i386_frame *) ebp; 433 } 434 435 static int 436 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame, 437 db_addr_t pc, register_t sp, int count) 438 { 439 struct i386_frame *actframe; 440 #define MAXNARG 16 441 char *argnames[MAXNARG], **argnp = NULL; 442 const char *name; 443 int *argp; 444 db_expr_t offset; 445 c_db_sym_t sym; 446 int instr, narg; 447 bool first; 448 449 if (db_segsize(tf) == 16) { 450 db_printf( 451 "--- 16-bit%s, cs:eip = %#x:%#x, ss:esp = %#x:%#x, ebp = %#x, tf = %p ---\n", 452 (tf->tf_eflags & PSL_VM) ? " (vm86)" : "", 453 tf->tf_cs, tf->tf_eip, 454 TF_HAS_STACKREGS(tf) ? tf->tf_ss : rss(), 455 TF_HAS_STACKREGS(tf) ? tf->tf_esp : (intptr_t)&tf->tf_esp, 456 tf->tf_ebp, tf); 457 return (0); 458 } 459 460 /* 'frame' can be null initially. Just print the pc then. */ 461 if (frame == NULL) 462 goto out; 463 464 /* 465 * If an indirect call via an invalid pointer caused a trap, 466 * %pc contains the invalid address while the return address 467 * of the unlucky caller has been saved by CPU on the stack 468 * just before the trap frame. In this case, try to recover 469 * the caller's address so that the first frame is assigned 470 * to the right spot in the right function, for that is where 471 * the failure actually happened. 472 * 473 * This trick depends on the fault address stashed in tf_err 474 * by trap_fatal() before entering KDB. 475 */ 476 if (kdb_frame && pc == kdb_frame->tf_err) { 477 /* 478 * Find where the trap frame actually ends. 479 * It won't contain tf_esp or tf_ss unless crossing rings. 480 */ 481 if (TF_HAS_STACKREGS(kdb_frame)) 482 instr = (int)(kdb_frame + 1); 483 else 484 instr = (int)&kdb_frame->tf_esp; 485 pc = db_get_value(instr, 4, false); 486 } 487 488 if (count == -1) 489 count = 1024; 490 491 first = true; 492 while (count-- && !db_pager_quit) { 493 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 494 db_symbol_values(sym, &name, NULL); 495 496 /* 497 * Attempt to determine a (possibly fake) frame that gives 498 * the caller's pc. It may differ from `frame' if the 499 * current function never sets up a standard frame or hasn't 500 * set one up yet or has just discarded one. The last two 501 * cases can be guessed fairly reliably for code generated 502 * by gcc. The first case is too much trouble to handle in 503 * general because the amount of junk on the stack depends 504 * on the pc (the special handling of "calltrap", etc. in 505 * db_nextframe() works because the `next' pc is special). 506 */ 507 actframe = frame; 508 if (first) { 509 first = false; 510 if (sym == C_DB_SYM_NULL && sp != 0) { 511 /* 512 * If a symbol couldn't be found, we've probably 513 * jumped to a bogus location, so try and use 514 * the return address to find our caller. 515 */ 516 db_print_stack_entry(name, 0, 0, 0, pc, 517 NULL); 518 pc = db_get_value(sp, 4, false); 519 if (db_search_symbol(pc, DB_STGY_PROC, 520 &offset) == C_DB_SYM_NULL) 521 break; 522 continue; 523 } else if (tf != NULL) { 524 instr = db_get_value(pc, 4, false); 525 if ((instr & 0xffffff) == 0x00e58955) { 526 /* pushl %ebp; movl %esp, %ebp */ 527 actframe = (void *)(get_esp(tf) - 4); 528 } else if ((instr & 0xffff) == 0x0000e589) { 529 /* movl %esp, %ebp */ 530 actframe = (void *)get_esp(tf); 531 if (tf->tf_ebp == 0) { 532 /* Fake frame better. */ 533 frame = actframe; 534 } 535 } else if ((instr & 0xff) == 0x000000c3) { 536 /* ret */ 537 actframe = (void *)(get_esp(tf) - 4); 538 } else if (offset == 0) { 539 /* Probably an assembler symbol. */ 540 actframe = (void *)(get_esp(tf) - 4); 541 } 542 } else if (strcmp(name, "fork_trampoline") == 0) { 543 /* 544 * Don't try to walk back on a stack for a 545 * process that hasn't actually been run yet. 546 */ 547 db_print_stack_entry(name, 0, 0, 0, pc, 548 actframe); 549 break; 550 } 551 } 552 553 argp = &actframe->f_arg0; 554 narg = MAXNARG; 555 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { 556 argnp = argnames; 557 } else { 558 narg = db_numargs(frame); 559 } 560 561 db_print_stack_entry(name, narg, argnp, argp, pc, actframe); 562 563 if (actframe != frame) { 564 /* `frame' belongs to caller. */ 565 pc = (db_addr_t) 566 db_get_value((int)&actframe->f_retaddr, 4, false); 567 continue; 568 } 569 570 db_nextframe(&frame, &pc, td); 571 572 out: 573 /* 574 * 'frame' can be null here, either because it was initially 575 * null or because db_nextframe() found no frame. 576 * db_nextframe() may also have found a non-kernel frame. 577 * !INKERNEL() classifies both. Stop tracing if either, 578 * after printing the pc if it is the kernel. 579 */ 580 if (frame == NULL || frame <= actframe) { 581 if (pc != 0) { 582 sym = db_search_symbol(pc, DB_STGY_ANY, 583 &offset); 584 db_symbol_values(sym, &name, NULL); 585 db_print_stack_entry(name, 0, 0, 0, pc, frame); 586 } 587 break; 588 } 589 } 590 591 return (0); 592 } 593 594 void 595 db_trace_self(void) 596 { 597 struct i386_frame *frame; 598 db_addr_t callpc; 599 register_t ebp; 600 601 __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); 602 frame = (struct i386_frame *)ebp; 603 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, false); 604 frame = frame->f_frame; 605 db_backtrace(curthread, NULL, frame, callpc, 0, -1); 606 } 607 608 int 609 db_trace_thread(struct thread *thr, int count) 610 { 611 struct pcb *ctx; 612 struct trapframe *tf; 613 614 ctx = kdb_thr_ctx(thr); 615 tf = thr == kdb_thread ? kdb_frame : NULL; 616 return (db_backtrace(thr, tf, (struct i386_frame *)ctx->pcb_ebp, 617 ctx->pcb_eip, ctx->pcb_esp, count)); 618 } 619 620 int 621 i386_set_watch(watchnum, watchaddr, size, access, d) 622 int watchnum; 623 unsigned int watchaddr; 624 int size; 625 int access; 626 struct dbreg *d; 627 { 628 int i, len; 629 630 if (watchnum == -1) { 631 for (i = 0; i < 4; i++) 632 if (!DBREG_DR7_ENABLED(d->dr[7], i)) 633 break; 634 if (i < 4) 635 watchnum = i; 636 else 637 return (-1); 638 } 639 640 switch (access) { 641 case DBREG_DR7_EXEC: 642 size = 1; /* size must be 1 for an execution breakpoint */ 643 /* fall through */ 644 case DBREG_DR7_WRONLY: 645 case DBREG_DR7_RDWR: 646 break; 647 default: 648 return (-1); 649 } 650 651 /* 652 * we can watch a 1, 2, or 4 byte sized location 653 */ 654 switch (size) { 655 case 1: 656 len = DBREG_DR7_LEN_1; 657 break; 658 case 2: 659 len = DBREG_DR7_LEN_2; 660 break; 661 case 4: 662 len = DBREG_DR7_LEN_4; 663 break; 664 default: 665 return (-1); 666 } 667 668 /* clear the bits we are about to affect */ 669 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 670 671 /* set drN register to the address, N=watchnum */ 672 DBREG_DRX(d, watchnum) = watchaddr; 673 674 /* enable the watchpoint */ 675 d->dr[7] |= DBREG_DR7_SET(watchnum, len, access, 676 DBREG_DR7_GLOBAL_ENABLE); 677 678 return (watchnum); 679 } 680 681 int 682 i386_clr_watch(watchnum, d) 683 int watchnum; 684 struct dbreg *d; 685 { 686 687 if (watchnum < 0 || watchnum >= 4) 688 return (-1); 689 690 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 691 DBREG_DRX(d, watchnum) = 0; 692 693 return (0); 694 } 695 696 int 697 db_md_set_watchpoint(addr, size) 698 db_expr_t addr; 699 db_expr_t size; 700 { 701 struct dbreg d; 702 int avail, i, wsize; 703 704 fill_dbregs(NULL, &d); 705 706 avail = 0; 707 for(i = 0; i < 4; i++) { 708 if (!DBREG_DR7_ENABLED(d.dr[7], i)) 709 avail++; 710 } 711 712 if (avail * 4 < size) 713 return (-1); 714 715 for (i = 0; i < 4 && (size > 0); i++) { 716 if (!DBREG_DR7_ENABLED(d.dr[7], i)) { 717 if (size > 2) 718 wsize = 4; 719 else 720 wsize = size; 721 i386_set_watch(i, addr, wsize, 722 DBREG_DR7_WRONLY, &d); 723 addr += wsize; 724 size -= wsize; 725 } 726 } 727 728 set_dbregs(NULL, &d); 729 730 return(0); 731 } 732 733 int 734 db_md_clr_watchpoint(addr, size) 735 db_expr_t addr; 736 db_expr_t size; 737 { 738 struct dbreg d; 739 int i; 740 741 fill_dbregs(NULL, &d); 742 743 for(i = 0; i < 4; i++) { 744 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 745 if ((DBREG_DRX((&d), i) >= addr) && 746 (DBREG_DRX((&d), i) < addr+size)) 747 i386_clr_watch(i, &d); 748 } 749 } 750 751 set_dbregs(NULL, &d); 752 753 return(0); 754 } 755 756 static const char * 757 watchtype_str(type) 758 int type; 759 { 760 switch (type) { 761 case DBREG_DR7_EXEC : return "execute"; break; 762 case DBREG_DR7_RDWR : return "read/write"; break; 763 case DBREG_DR7_WRONLY : return "write"; break; 764 default : return "invalid"; break; 765 } 766 } 767 768 void 769 db_md_list_watchpoints(void) 770 { 771 struct dbreg d; 772 int i, len, type; 773 774 fill_dbregs(NULL, &d); 775 776 db_printf("\nhardware watchpoints:\n"); 777 db_printf(" watch status type len address\n"); 778 db_printf(" ----- -------- ---------- --- ----------\n"); 779 for (i = 0; i < 4; i++) { 780 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 781 type = DBREG_DR7_ACCESS(d.dr[7], i); 782 len = DBREG_DR7_LEN(d.dr[7], i); 783 db_printf(" %-5d %-8s %10s %3d ", 784 i, "enabled", watchtype_str(type), len + 1); 785 db_printsym((db_addr_t)DBREG_DRX(&d, i), DB_STGY_ANY); 786 db_printf("\n"); 787 } else { 788 db_printf(" %-5d disabled\n", i); 789 } 790 } 791 792 db_printf("\ndebug register values:\n"); 793 for (i = 0; i < 8; i++) 794 if (i != 4 && i != 5) 795 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX(&d, i)); 796 db_printf("\n"); 797 }
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