Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/amd64/amd64/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/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_frame; 60 static db_varfcn_t db_rsp; 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 #if 0 70 { "ds", DB_OFFSET(tf_ds), db_frame }, 71 { "es", DB_OFFSET(tf_es), db_frame }, 72 { "fs", DB_OFFSET(tf_fs), db_frame }, 73 { "gs", DB_OFFSET(tf_gs), db_frame }, 74 #endif 75 { "ss", NULL, db_ss }, 76 { "rax", DB_OFFSET(tf_rax), db_frame }, 77 { "rcx", DB_OFFSET(tf_rcx), db_frame }, 78 { "rdx", DB_OFFSET(tf_rdx), db_frame }, 79 { "rbx", DB_OFFSET(tf_rbx), db_frame }, 80 { "rsp", NULL, db_rsp }, 81 { "rbp", DB_OFFSET(tf_rbp), db_frame }, 82 { "rsi", DB_OFFSET(tf_rsi), db_frame }, 83 { "rdi", DB_OFFSET(tf_rdi), db_frame }, 84 { "r8", DB_OFFSET(tf_r8), db_frame }, 85 { "r9", DB_OFFSET(tf_r9), db_frame }, 86 { "r10", DB_OFFSET(tf_r10), db_frame }, 87 { "r11", DB_OFFSET(tf_r11), db_frame }, 88 { "r12", DB_OFFSET(tf_r12), db_frame }, 89 { "r13", DB_OFFSET(tf_r13), db_frame }, 90 { "r14", DB_OFFSET(tf_r14), db_frame }, 91 { "r15", DB_OFFSET(tf_r15), db_frame }, 92 { "rip", DB_OFFSET(tf_rip), db_frame }, 93 { "rflags", DB_OFFSET(tf_rflags), db_frame }, 94 #define DB_N_SHOW_REGS 20 /* Don't show registers after here. */ 95 { "dr0", NULL, db_dr0 }, 96 { "dr1", NULL, db_dr1 }, 97 { "dr2", NULL, db_dr2 }, 98 { "dr3", NULL, db_dr3 }, 99 { "dr4", NULL, db_dr4 }, 100 { "dr5", NULL, db_dr5 }, 101 { "dr6", NULL, db_dr6 }, 102 { "dr7", NULL, db_dr7 }, 103 }; 104 struct db_variable *db_eregs = db_regs + DB_N_SHOW_REGS; 105 106 #define DB_DRX_FUNC(reg) \ 107 static int \ 108 db_ ## reg (vp, valuep, op) \ 109 struct db_variable *vp; \ 110 db_expr_t * valuep; \ 111 int op; \ 112 { \ 113 if (op == DB_VAR_GET) \ 114 *valuep = r ## reg (); \ 115 else \ 116 load_ ## reg (*valuep); \ 117 return (1); \ 118 } 119 120 DB_DRX_FUNC(dr0) 121 DB_DRX_FUNC(dr1) 122 DB_DRX_FUNC(dr2) 123 DB_DRX_FUNC(dr3) 124 DB_DRX_FUNC(dr4) 125 DB_DRX_FUNC(dr5) 126 DB_DRX_FUNC(dr6) 127 DB_DRX_FUNC(dr7) 128 129 static __inline long 130 get_rsp(struct trapframe *tf) 131 { 132 return ((ISPL(tf->tf_cs)) ? tf->tf_rsp : 133 (db_expr_t)tf + offsetof(struct trapframe, tf_rsp)); 134 } 135 136 static int 137 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 138 { 139 long *reg; 140 141 if (kdb_frame == NULL) 142 return (0); 143 144 reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep); 145 if (op == DB_VAR_GET) 146 *valuep = *reg; 147 else 148 *reg = *valuep; 149 return (1); 150 } 151 152 static int 153 db_rsp(struct db_variable *vp, db_expr_t *valuep, int op) 154 { 155 156 if (kdb_frame == NULL) 157 return (0); 158 159 if (op == DB_VAR_GET) 160 *valuep = get_rsp(kdb_frame); 161 else if (ISPL(kdb_frame->tf_cs)) 162 kdb_frame->tf_rsp = *valuep; 163 return (1); 164 } 165 166 static int 167 db_ss(struct db_variable *vp, db_expr_t *valuep, int op) 168 { 169 170 if (kdb_frame == NULL) 171 return (0); 172 173 if (op == DB_VAR_GET) 174 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss(); 175 else if (ISPL(kdb_frame->tf_cs)) 176 kdb_frame->tf_ss = *valuep; 177 return (1); 178 } 179 180 /* 181 * Stack trace. 182 */ 183 #define INKERNEL(va) (((va) >= DMAP_MIN_ADDRESS && (va) < DMAP_MAX_ADDRESS) \ 184 || ((va) >= KERNBASE && (va) < VM_MAX_KERNEL_ADDRESS)) 185 186 struct amd64_frame { 187 struct amd64_frame *f_frame; 188 long f_retaddr; 189 long f_arg0; 190 }; 191 192 #define NORMAL 0 193 #define TRAP 1 194 #define INTERRUPT 2 195 #define SYSCALL 3 196 #define TRAP_INTERRUPT 5 197 198 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *); 199 static int db_numargs(struct amd64_frame *); 200 static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t); 201 static void decode_syscall(int, struct thread *); 202 203 static const char * watchtype_str(int type); 204 int amd64_set_watch(int watchnum, unsigned long watchaddr, int size, 205 int access, struct dbreg *d); 206 int amd64_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 amd64_frame *fp; 214 { 215 #if 1 216 return (0); /* regparm, needs dwarf2 info */ 217 #else 218 long *argp; 219 int inst; 220 int args; 221 222 argp = (long *)db_get_value((long)&fp->f_retaddr, 8, FALSE); 223 /* 224 * XXX etext is wrong for LKMs. We should attempt to interpret 225 * the instruction at the return address in all cases. This 226 * may require better fault handling. 227 */ 228 if (argp < (long *)btext || argp >= (long *)etext) { 229 args = 5; 230 } else { 231 inst = db_get_value((long)argp, 4, FALSE); 232 if ((inst & 0xff) == 0x59) /* popl %ecx */ 233 args = 1; 234 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ 235 args = ((inst >> 16) & 0xff) / 4; 236 else 237 args = 5; 238 } 239 return (args); 240 #endif 241 } 242 243 static void 244 db_print_stack_entry(name, narg, argnp, argp, callpc) 245 const char *name; 246 int narg; 247 char **argnp; 248 long *argp; 249 db_addr_t callpc; 250 { 251 db_printf("%s(", name); 252 #if 0 253 while (narg) { 254 if (argnp) 255 db_printf("%s=", *argnp++); 256 db_printf("%lr", (long)db_get_value((long)argp, 8, FALSE)); 257 argp++; 258 if (--narg != 0) 259 db_printf(","); 260 } 261 #endif 262 db_printf(") at "); 263 db_printsym(callpc, DB_STGY_PROC); 264 db_printf("\n"); 265 } 266 267 static void 268 decode_syscall(int number, struct thread *td) 269 { 270 struct proc *p; 271 c_db_sym_t sym; 272 db_expr_t diff; 273 sy_call_t *f; 274 const char *symname; 275 276 db_printf(" (%d", number); 277 p = (td != NULL) ? td->td_proc : NULL; 278 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) { 279 f = p->p_sysent->sv_table[number].sy_call; 280 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff); 281 if (sym != DB_SYM_NULL && diff == 0) { 282 db_symbol_values(sym, &symname, NULL); 283 db_printf(", %s, %s", p->p_sysent->sv_name, symname); 284 } 285 } 286 db_printf(")"); 287 } 288 289 /* 290 * Figure out the next frame up in the call stack. 291 */ 292 static void 293 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td) 294 { 295 struct trapframe *tf; 296 int frame_type; 297 long rip, rsp, rbp; 298 db_expr_t offset; 299 c_db_sym_t sym; 300 const char *name; 301 302 rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE); 303 rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE); 304 305 /* 306 * Figure out frame type. We look at the address just before 307 * the saved instruction pointer as the saved EIP is after the 308 * call function, and if the function being called is marked as 309 * dead (such as panic() at the end of dblfault_handler()), then 310 * the instruction at the saved EIP will be part of a different 311 * function (syscall() in this example) rather than the one that 312 * actually made the call. 313 */ 314 frame_type = NORMAL; 315 sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset); 316 db_symbol_values(sym, &name, NULL); 317 if (name != NULL) { 318 if (strcmp(name, "calltrap") == 0 || 319 strcmp(name, "fork_trampoline") == 0 || 320 strcmp(name, "nmi_calltrap") == 0 || 321 strcmp(name, "Xdblfault") == 0) 322 frame_type = TRAP; 323 else if (strncmp(name, "Xatpic_intr", 11) == 0 || 324 strncmp(name, "Xapic_isr", 9) == 0 || 325 strcmp(name, "Xtimerint") == 0 || 326 strcmp(name, "Xipi_intr_bitmap_handler") == 0 || 327 strcmp(name, "Xcpustop") == 0 || 328 strcmp(name, "Xrendezvous") == 0) 329 frame_type = INTERRUPT; 330 else if (strcmp(name, "Xfast_syscall") == 0) 331 frame_type = SYSCALL; 332 /* XXX: These are interrupts with trap frames. */ 333 else if (strcmp(name, "Xtimerint") == 0 || 334 strcmp(name, "Xcpustop") == 0 || 335 strcmp(name, "Xrendezvous") == 0 || 336 strcmp(name, "Xipi_intr_bitmap_handler") == 0) 337 frame_type = TRAP_INTERRUPT; 338 } 339 340 /* 341 * Normal frames need no special processing. 342 */ 343 if (frame_type == NORMAL) { 344 *ip = (db_addr_t) rip; 345 *fp = (struct amd64_frame *) rbp; 346 return; 347 } 348 349 db_print_stack_entry(name, 0, 0, 0, rip); 350 351 /* 352 * Point to base of trapframe which is just above the 353 * current frame. 354 */ 355 tf = (struct trapframe *)((long)*fp + 16); 356 357 if (INKERNEL((long) tf)) { 358 rsp = get_rsp(tf); 359 rip = tf->tf_rip; 360 rbp = tf->tf_rbp; 361 switch (frame_type) { 362 case TRAP: 363 db_printf("--- trap %#lr", tf->tf_trapno); 364 break; 365 case SYSCALL: 366 db_printf("--- syscall"); 367 decode_syscall(tf->tf_rax, td); 368 break; 369 case TRAP_INTERRUPT: 370 case INTERRUPT: 371 db_printf("--- interrupt"); 372 break; 373 default: 374 panic("The moon has moved again."); 375 } 376 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip, 377 rsp, rbp); 378 } 379 380 *ip = (db_addr_t) rip; 381 *fp = (struct amd64_frame *) rbp; 382 } 383 384 static int 385 db_backtrace(struct thread *td, struct trapframe *tf, 386 struct amd64_frame *frame, db_addr_t pc, int count) 387 { 388 struct amd64_frame *actframe; 389 #define MAXNARG 16 390 char *argnames[MAXNARG], **argnp = NULL; 391 const char *name; 392 long *argp; 393 db_expr_t offset; 394 c_db_sym_t sym; 395 int narg; 396 boolean_t first; 397 398 if (count == -1) 399 count = 1024; 400 401 first = TRUE; 402 while (count-- && !db_pager_quit) { 403 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 404 db_symbol_values(sym, &name, NULL); 405 406 /* 407 * Attempt to determine a (possibly fake) frame that gives 408 * the caller's pc. It may differ from `frame' if the 409 * current function never sets up a standard frame or hasn't 410 * set one up yet or has just discarded one. The last two 411 * cases can be guessed fairly reliably for code generated 412 * by gcc. The first case is too much trouble to handle in 413 * general because the amount of junk on the stack depends 414 * on the pc (the special handling of "calltrap", etc. in 415 * db_nextframe() works because the `next' pc is special). 416 */ 417 actframe = frame; 418 if (first) { 419 if (tf != NULL) { 420 int instr; 421 422 instr = db_get_value(pc, 4, FALSE); 423 if ((instr & 0xffffffff) == 0xe5894855) { 424 /* pushq %rbp; movq %rsp, %rbp */ 425 actframe = (void *)(get_rsp(tf) - 8); 426 } else if ((instr & 0xffffff) == 0xe58948) { 427 /* movq %rsp, %rbp */ 428 actframe = (void *)get_rsp(tf); 429 if (tf->tf_rbp == 0) { 430 /* Fake frame better. */ 431 frame = actframe; 432 } 433 } else if ((instr & 0xff) == 0xc3) { 434 /* ret */ 435 actframe = (void *)(get_rsp(tf) - 8); 436 } else if (offset == 0) { 437 /* Probably an assembler symbol. */ 438 actframe = (void *)(get_rsp(tf) - 8); 439 } 440 } else if (strcmp(name, "fork_trampoline") == 0) { 441 /* 442 * Don't try to walk back on a stack for a 443 * process that hasn't actually been run yet. 444 */ 445 db_print_stack_entry(name, 0, 0, 0, pc); 446 break; 447 } 448 first = FALSE; 449 } 450 451 argp = &actframe->f_arg0; 452 narg = MAXNARG; 453 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { 454 argnp = argnames; 455 } else { 456 narg = db_numargs(frame); 457 } 458 459 db_print_stack_entry(name, narg, argnp, argp, pc); 460 461 if (actframe != frame) { 462 /* `frame' belongs to caller. */ 463 pc = (db_addr_t) 464 db_get_value((long)&actframe->f_retaddr, 8, FALSE); 465 continue; 466 } 467 468 db_nextframe(&frame, &pc, td); 469 470 if (INKERNEL((long)pc) && !INKERNEL((long)frame)) { 471 sym = db_search_symbol(pc, DB_STGY_ANY, &offset); 472 db_symbol_values(sym, &name, NULL); 473 db_print_stack_entry(name, 0, 0, 0, pc); 474 break; 475 } 476 if (!INKERNEL((long) frame)) { 477 break; 478 } 479 } 480 481 return (0); 482 } 483 484 void 485 db_trace_self(void) 486 { 487 struct amd64_frame *frame; 488 db_addr_t callpc; 489 register_t rbp; 490 491 __asm __volatile("movq %%rbp,%0" : "=r" (rbp)); 492 frame = (struct amd64_frame *)rbp; 493 callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE); 494 frame = frame->f_frame; 495 db_backtrace(curthread, NULL, frame, callpc, -1); 496 } 497 498 int 499 db_trace_thread(struct thread *thr, int count) 500 { 501 struct pcb *ctx; 502 503 ctx = kdb_thr_ctx(thr); 504 return (db_backtrace(thr, NULL, (struct amd64_frame *)ctx->pcb_rbp, 505 ctx->pcb_rip, count)); 506 } 507 508 void 509 stack_save(struct stack *st) 510 { 511 struct amd64_frame *frame; 512 vm_offset_t callpc; 513 register_t rbp; 514 515 stack_zero(st); 516 __asm __volatile("movq %%rbp,%0" : "=r" (rbp)); 517 frame = (struct amd64_frame *)rbp; 518 while (1) { 519 if (!INKERNEL((long)frame)) 520 break; 521 callpc = frame->f_retaddr; 522 if (!INKERNEL(callpc)) 523 break; 524 if (stack_put(st, callpc) == -1) 525 break; 526 if (frame->f_frame <= frame || 527 (vm_offset_t)frame->f_frame >= 528 (vm_offset_t)rbp + KSTACK_PAGES * PAGE_SIZE) 529 break; 530 frame = frame->f_frame; 531 } 532 } 533 534 int 535 amd64_set_watch(watchnum, watchaddr, size, access, d) 536 int watchnum; 537 unsigned long watchaddr; 538 int size; 539 int access; 540 struct dbreg *d; 541 { 542 int i, len; 543 544 if (watchnum == -1) { 545 for (i = 0; i < 4; i++) 546 if (!DBREG_DR7_ENABLED(d->dr[7], i)) 547 break; 548 if (i < 4) 549 watchnum = i; 550 else 551 return (-1); 552 } 553 554 switch (access) { 555 case DBREG_DR7_EXEC: 556 size = 1; /* size must be 1 for an execution breakpoint */ 557 /* fall through */ 558 case DBREG_DR7_WRONLY: 559 case DBREG_DR7_RDWR: 560 break; 561 default: 562 return (-1); 563 } 564 565 /* 566 * we can watch a 1, 2, 4, or 8 byte sized location 567 */ 568 switch (size) { 569 case 1: 570 len = DBREG_DR7_LEN_1; 571 break; 572 case 2: 573 len = DBREG_DR7_LEN_2; 574 break; 575 case 4: 576 len = DBREG_DR7_LEN_4; 577 break; 578 case 8: 579 len = DBREG_DR7_LEN_8; 580 break; 581 default: 582 return (-1); 583 } 584 585 /* clear the bits we are about to affect */ 586 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 587 588 /* set drN register to the address, N=watchnum */ 589 DBREG_DRX(d, watchnum) = watchaddr; 590 591 /* enable the watchpoint */ 592 d->dr[7] |= DBREG_DR7_SET(watchnum, len, access, 593 DBREG_DR7_GLOBAL_ENABLE); 594 595 return (watchnum); 596 } 597 598 599 int 600 amd64_clr_watch(watchnum, d) 601 int watchnum; 602 struct dbreg *d; 603 { 604 605 if (watchnum < 0 || watchnum >= 4) 606 return (-1); 607 608 d->dr[7] &= ~DBREG_DR7_MASK(watchnum); 609 DBREG_DRX(d, watchnum) = 0; 610 611 return (0); 612 } 613 614 615 int 616 db_md_set_watchpoint(addr, size) 617 db_expr_t addr; 618 db_expr_t size; 619 { 620 struct dbreg d; 621 int avail, i, wsize; 622 623 fill_dbregs(NULL, &d); 624 625 avail = 0; 626 for(i = 0; i < 4; i++) { 627 if (!DBREG_DR7_ENABLED(d.dr[7], i)) 628 avail++; 629 } 630 631 if (avail * 8 < size) 632 return (-1); 633 634 for (i = 0; i < 4 && (size > 0); i++) { 635 if (!DBREG_DR7_ENABLED(d.dr[7], i)) { 636 if (size >= 8 || (avail == 1 && size > 4)) 637 wsize = 8; 638 else if (size > 2) 639 wsize = 4; 640 else 641 wsize = size; 642 amd64_set_watch(i, addr, wsize, 643 DBREG_DR7_WRONLY, &d); 644 addr += wsize; 645 size -= wsize; 646 avail--; 647 } 648 } 649 650 set_dbregs(NULL, &d); 651 652 return(0); 653 } 654 655 656 int 657 db_md_clr_watchpoint(addr, size) 658 db_expr_t addr; 659 db_expr_t size; 660 { 661 struct dbreg d; 662 int i; 663 664 fill_dbregs(NULL, &d); 665 666 for(i = 0; i < 4; i++) { 667 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 668 if ((DBREG_DRX((&d), i) >= addr) && 669 (DBREG_DRX((&d), i) < addr+size)) 670 amd64_clr_watch(i, &d); 671 672 } 673 } 674 675 set_dbregs(NULL, &d); 676 677 return(0); 678 } 679 680 681 static const char * 682 watchtype_str(type) 683 int type; 684 { 685 switch (type) { 686 case DBREG_DR7_EXEC : return "execute"; break; 687 case DBREG_DR7_RDWR : return "read/write"; break; 688 case DBREG_DR7_WRONLY : return "write"; break; 689 default : return "invalid"; break; 690 } 691 } 692 693 694 void 695 db_md_list_watchpoints() 696 { 697 struct dbreg d; 698 int i, len, type; 699 700 fill_dbregs(NULL, &d); 701 702 db_printf("\nhardware watchpoints:\n"); 703 db_printf(" watch status type len address\n"); 704 db_printf(" ----- -------- ---------- --- ------------------\n"); 705 for (i = 0; i < 4; i++) { 706 if (DBREG_DR7_ENABLED(d.dr[7], i)) { 707 type = DBREG_DR7_ACCESS(d.dr[7], i); 708 len = DBREG_DR7_LEN(d.dr[7], i); 709 if (len == DBREG_DR7_LEN_8) 710 len = 8; 711 else 712 len++; 713 db_printf(" %-5d %-8s %10s %3d ", 714 i, "enabled", watchtype_str(type), len); 715 db_printsym((db_addr_t)DBREG_DRX((&d), i), DB_STGY_ANY); 716 db_printf("\n"); 717 } else { 718 db_printf(" %-5d disabled\n", i); 719 } 720 } 721 722 db_printf("\ndebug register values:\n"); 723 for (i = 0; i < 8; i++) { 724 db_printf(" dr%d 0x%016lx\n", i, DBREG_DRX((&d), i)); 725 } 726 db_printf("\n"); 727 }
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