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/11.2/sys/i386/i386/db_trace.c 308418 2016-11-07 12:10:17Z kib $");
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 sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset);
321 db_symbol_values(sym, &name, NULL);
322 if (name != NULL) {
323 if (strcmp(name, "calltrap") == 0 ||
324 strcmp(name, "fork_trampoline") == 0)
325 frame_type = TRAP;
326 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
327 strncmp(name, "Xapic_isr", 9) == 0)
328 frame_type = INTERRUPT;
329 else if (strcmp(name, "Xlcall_syscall") == 0 ||
330 strcmp(name, "Xint0x80_syscall") == 0)
331 frame_type = SYSCALL;
332 else if (strcmp(name, "dblfault_handler") == 0)
333 frame_type = DOUBLE_FAULT;
334 /* XXX: These are interrupts with trap frames. */
335 else if (strcmp(name, "Xtimerint") == 0)
336 frame_type = TRAP_TIMERINT;
337 else if (strcmp(name, "Xcpustop") == 0 ||
338 strcmp(name, "Xrendezvous") == 0 ||
339 strcmp(name, "Xipi_intr_bitmap_handler") == 0)
340 frame_type = TRAP_INTERRUPT;
341 }
342
343 /*
344 * Normal frames need no special processing.
345 */
346 if (frame_type == NORMAL) {
347 *ip = (db_addr_t) eip;
348 *fp = (struct i386_frame *) ebp;
349 return;
350 }
351
352 db_print_stack_entry(name, 0, 0, 0, eip, &(*fp)->f_frame);
353
354 /*
355 * For a double fault, we have to snag the values from the
356 * previous TSS since a double fault uses a task gate to
357 * switch to a known good state.
358 */
359 if (frame_type == DOUBLE_FAULT) {
360 esp = PCPU_GET(common_tss.tss_esp);
361 eip = PCPU_GET(common_tss.tss_eip);
362 ebp = PCPU_GET(common_tss.tss_ebp);
363 db_printf(
364 "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n",
365 eip, esp, ebp);
366 *ip = (db_addr_t) eip;
367 *fp = (struct i386_frame *) ebp;
368 return;
369 }
370
371 /*
372 * Point to base of trapframe which is just above the
373 * current frame.
374 */
375 if (frame_type == INTERRUPT)
376 tf = (struct trapframe *)((int)*fp + 16);
377 else if (frame_type == TRAP_INTERRUPT)
378 tf = (struct trapframe *)((int)*fp + 8);
379 else
380 tf = (struct trapframe *)((int)*fp + 12);
381
382 if (INKERNEL((int) tf)) {
383 esp = get_esp(tf);
384 eip = tf->tf_eip;
385 ebp = tf->tf_ebp;
386 switch (frame_type) {
387 case TRAP:
388 db_printf("--- trap %#r", tf->tf_trapno);
389 break;
390 case SYSCALL:
391 db_printf("--- syscall");
392 decode_syscall(tf->tf_eax, td);
393 break;
394 case TRAP_TIMERINT:
395 case TRAP_INTERRUPT:
396 case INTERRUPT:
397 db_printf("--- interrupt");
398 break;
399 default:
400 panic("The moon has moved again.");
401 }
402 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip,
403 esp, ebp);
404 }
405
406 *ip = (db_addr_t) eip;
407 *fp = (struct i386_frame *) ebp;
408 }
409
410 static int
411 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame,
412 db_addr_t pc, register_t sp, int count)
413 {
414 struct i386_frame *actframe;
415 #define MAXNARG 16
416 char *argnames[MAXNARG], **argnp = NULL;
417 const char *name;
418 int *argp;
419 db_expr_t offset;
420 c_db_sym_t sym;
421 int instr, narg;
422 boolean_t first;
423
424 if (db_segsize(tf) == 16) {
425 db_printf(
426 "--- 16-bit%s, cs:eip = %#x:%#x, ss:esp = %#x:%#x, ebp = %#x, tf = %p ---\n",
427 (tf->tf_eflags & PSL_VM) ? " (vm86)" : "",
428 tf->tf_cs, tf->tf_eip,
429 TF_HAS_STACKREGS(tf) ? tf->tf_ss : rss(),
430 TF_HAS_STACKREGS(tf) ? tf->tf_esp : (intptr_t)&tf->tf_esp,
431 tf->tf_ebp, tf);
432 return (0);
433 }
434
435 /*
436 * If an indirect call via an invalid pointer caused a trap,
437 * %pc contains the invalid address while the return address
438 * of the unlucky caller has been saved by CPU on the stack
439 * just before the trap frame. In this case, try to recover
440 * the caller's address so that the first frame is assigned
441 * to the right spot in the right function, for that is where
442 * the failure actually happened.
443 *
444 * This trick depends on the fault address stashed in tf_err
445 * by trap_fatal() before entering KDB.
446 */
447 if (kdb_frame && pc == kdb_frame->tf_err) {
448 /*
449 * Find where the trap frame actually ends.
450 * It won't contain tf_esp or tf_ss unless crossing rings.
451 */
452 if (TF_HAS_STACKREGS(kdb_frame))
453 instr = (int)(kdb_frame + 1);
454 else
455 instr = (int)&kdb_frame->tf_esp;
456 pc = db_get_value(instr, 4, FALSE);
457 }
458
459 if (count == -1)
460 count = 1024;
461
462 first = TRUE;
463 while (count-- && !db_pager_quit) {
464 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
465 db_symbol_values(sym, &name, NULL);
466
467 /*
468 * Attempt to determine a (possibly fake) frame that gives
469 * the caller's pc. It may differ from `frame' if the
470 * current function never sets up a standard frame or hasn't
471 * set one up yet or has just discarded one. The last two
472 * cases can be guessed fairly reliably for code generated
473 * by gcc. The first case is too much trouble to handle in
474 * general because the amount of junk on the stack depends
475 * on the pc (the special handling of "calltrap", etc. in
476 * db_nextframe() works because the `next' pc is special).
477 */
478 actframe = frame;
479 if (first) {
480 first = FALSE;
481 if (sym == C_DB_SYM_NULL && sp != 0) {
482 /*
483 * If a symbol couldn't be found, we've probably
484 * jumped to a bogus location, so try and use
485 * the return address to find our caller.
486 */
487 db_print_stack_entry(name, 0, 0, 0, pc,
488 NULL);
489 pc = db_get_value(sp, 4, FALSE);
490 if (db_search_symbol(pc, DB_STGY_PROC,
491 &offset) == C_DB_SYM_NULL)
492 break;
493 continue;
494 } else if (tf != NULL) {
495 instr = db_get_value(pc, 4, FALSE);
496 if ((instr & 0xffffff) == 0x00e58955) {
497 /* pushl %ebp; movl %esp, %ebp */
498 actframe = (void *)(get_esp(tf) - 4);
499 } else if ((instr & 0xffff) == 0x0000e589) {
500 /* movl %esp, %ebp */
501 actframe = (void *)get_esp(tf);
502 if (tf->tf_ebp == 0) {
503 /* Fake frame better. */
504 frame = actframe;
505 }
506 } else if ((instr & 0xff) == 0x000000c3) {
507 /* ret */
508 actframe = (void *)(get_esp(tf) - 4);
509 } else if (offset == 0) {
510 /* Probably an assembler symbol. */
511 actframe = (void *)(get_esp(tf) - 4);
512 }
513 } else if (strcmp(name, "fork_trampoline") == 0) {
514 /*
515 * Don't try to walk back on a stack for a
516 * process that hasn't actually been run yet.
517 */
518 db_print_stack_entry(name, 0, 0, 0, pc,
519 actframe);
520 break;
521 }
522 }
523
524 argp = &actframe->f_arg0;
525 narg = MAXNARG;
526 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
527 argnp = argnames;
528 } else {
529 narg = db_numargs(frame);
530 }
531
532 db_print_stack_entry(name, narg, argnp, argp, pc, actframe);
533
534 if (actframe != frame) {
535 /* `frame' belongs to caller. */
536 pc = (db_addr_t)
537 db_get_value((int)&actframe->f_retaddr, 4, FALSE);
538 continue;
539 }
540
541 db_nextframe(&frame, &pc, td);
542
543 if (INKERNEL((int)pc) && !INKERNEL((int) frame)) {
544 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
545 db_symbol_values(sym, &name, NULL);
546 db_print_stack_entry(name, 0, 0, 0, pc, frame);
547 break;
548 }
549 if (!INKERNEL((int) frame)) {
550 break;
551 }
552 }
553
554 return (0);
555 }
556
557 void
558 db_trace_self(void)
559 {
560 struct i386_frame *frame;
561 db_addr_t callpc;
562 register_t ebp;
563
564 __asm __volatile("movl %%ebp,%0" : "=r" (ebp));
565 frame = (struct i386_frame *)ebp;
566 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
567 frame = frame->f_frame;
568 db_backtrace(curthread, NULL, frame, callpc, 0, -1);
569 }
570
571 int
572 db_trace_thread(struct thread *thr, int count)
573 {
574 struct pcb *ctx;
575 struct trapframe *tf;
576
577 ctx = kdb_thr_ctx(thr);
578 tf = thr == kdb_thread ? kdb_frame : NULL;
579 return (db_backtrace(thr, tf, (struct i386_frame *)ctx->pcb_ebp,
580 ctx->pcb_eip, ctx->pcb_esp, count));
581 }
582
583 int
584 i386_set_watch(watchnum, watchaddr, size, access, d)
585 int watchnum;
586 unsigned int watchaddr;
587 int size;
588 int access;
589 struct dbreg *d;
590 {
591 int i, len;
592
593 if (watchnum == -1) {
594 for (i = 0; i < 4; i++)
595 if (!DBREG_DR7_ENABLED(d->dr[7], i))
596 break;
597 if (i < 4)
598 watchnum = i;
599 else
600 return (-1);
601 }
602
603 switch (access) {
604 case DBREG_DR7_EXEC:
605 size = 1; /* size must be 1 for an execution breakpoint */
606 /* fall through */
607 case DBREG_DR7_WRONLY:
608 case DBREG_DR7_RDWR:
609 break;
610 default:
611 return (-1);
612 }
613
614 /*
615 * we can watch a 1, 2, or 4 byte sized location
616 */
617 switch (size) {
618 case 1:
619 len = DBREG_DR7_LEN_1;
620 break;
621 case 2:
622 len = DBREG_DR7_LEN_2;
623 break;
624 case 4:
625 len = DBREG_DR7_LEN_4;
626 break;
627 default:
628 return (-1);
629 }
630
631 /* clear the bits we are about to affect */
632 d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
633
634 /* set drN register to the address, N=watchnum */
635 DBREG_DRX(d, watchnum) = watchaddr;
636
637 /* enable the watchpoint */
638 d->dr[7] |= DBREG_DR7_SET(watchnum, len, access,
639 DBREG_DR7_GLOBAL_ENABLE);
640
641 return (watchnum);
642 }
643
644
645 int
646 i386_clr_watch(watchnum, d)
647 int watchnum;
648 struct dbreg *d;
649 {
650
651 if (watchnum < 0 || watchnum >= 4)
652 return (-1);
653
654 d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
655 DBREG_DRX(d, watchnum) = 0;
656
657 return (0);
658 }
659
660
661 int
662 db_md_set_watchpoint(addr, size)
663 db_expr_t addr;
664 db_expr_t size;
665 {
666 struct dbreg d;
667 int avail, i, wsize;
668
669 fill_dbregs(NULL, &d);
670
671 avail = 0;
672 for(i = 0; i < 4; i++) {
673 if (!DBREG_DR7_ENABLED(d.dr[7], i))
674 avail++;
675 }
676
677 if (avail * 4 < size)
678 return (-1);
679
680 for (i = 0; i < 4 && (size > 0); i++) {
681 if (!DBREG_DR7_ENABLED(d.dr[7], i)) {
682 if (size > 2)
683 wsize = 4;
684 else
685 wsize = size;
686 i386_set_watch(i, addr, wsize,
687 DBREG_DR7_WRONLY, &d);
688 addr += wsize;
689 size -= wsize;
690 }
691 }
692
693 set_dbregs(NULL, &d);
694
695 return(0);
696 }
697
698
699 int
700 db_md_clr_watchpoint(addr, size)
701 db_expr_t addr;
702 db_expr_t size;
703 {
704 struct dbreg d;
705 int i;
706
707 fill_dbregs(NULL, &d);
708
709 for(i = 0; i < 4; i++) {
710 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
711 if ((DBREG_DRX((&d), i) >= addr) &&
712 (DBREG_DRX((&d), i) < addr+size))
713 i386_clr_watch(i, &d);
714
715 }
716 }
717
718 set_dbregs(NULL, &d);
719
720 return(0);
721 }
722
723
724 static const char *
725 watchtype_str(type)
726 int type;
727 {
728 switch (type) {
729 case DBREG_DR7_EXEC : return "execute"; break;
730 case DBREG_DR7_RDWR : return "read/write"; break;
731 case DBREG_DR7_WRONLY : return "write"; break;
732 default : return "invalid"; break;
733 }
734 }
735
736
737 void
738 db_md_list_watchpoints()
739 {
740 struct dbreg d;
741 int i, len, type;
742
743 fill_dbregs(NULL, &d);
744
745 db_printf("\nhardware watchpoints:\n");
746 db_printf(" watch status type len address\n");
747 db_printf(" ----- -------- ---------- --- ----------\n");
748 for (i = 0; i < 4; i++) {
749 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
750 type = DBREG_DR7_ACCESS(d.dr[7], i);
751 len = DBREG_DR7_LEN(d.dr[7], i);
752 db_printf(" %-5d %-8s %10s %3d ",
753 i, "enabled", watchtype_str(type), len + 1);
754 db_printsym((db_addr_t)DBREG_DRX((&d), i), DB_STGY_ANY);
755 db_printf("\n");
756 } else {
757 db_printf(" %-5d disabled\n", i);
758 }
759 }
760
761 db_printf("\ndebug register values:\n");
762 for (i = 0; i < 8; i++) {
763 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d), i));
764 }
765 db_printf("\n");
766 }
767
768
Cache object: 764c84e0802ef6805df8d6093250f793
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