what the heck one last one before i go take a nap...
[dragonfly.git] / sys / platform / pc32 / i386 / db_trace.c
CommitLineData
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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 * $FreeBSD: src/sys/i386/i386/db_trace.c,v 1.35.2.3 2002/02/21 22:31:25 silby Exp $
3ae0cd58 27 * $DragonFly: src/sys/platform/pc32/i386/db_trace.c,v 1.6 2003/08/26 21:42:18 rob Exp $
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28 */
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/linker_set.h>
33#include <sys/lock.h>
34#include <sys/proc.h>
35
36#include <machine/cpu.h>
37#include <machine/md_var.h>
38#include <machine/reg.h>
39
40#include <vm/vm.h>
41#include <vm/vm_param.h>
42#include <vm/pmap.h>
43#include <vm/vm_map.h>
44#include <ddb/ddb.h>
45
46#include <sys/user.h>
47
48#include <ddb/db_access.h>
49#include <ddb/db_sym.h>
50#include <ddb/db_variables.h>
51
52db_varfcn_t db_dr0;
53db_varfcn_t db_dr1;
54db_varfcn_t db_dr2;
55db_varfcn_t db_dr3;
56db_varfcn_t db_dr4;
57db_varfcn_t db_dr5;
58db_varfcn_t db_dr6;
59db_varfcn_t db_dr7;
60
61/*
62 * Machine register set.
63 */
64struct db_variable db_regs[] = {
65 { "cs", &ddb_regs.tf_cs, FCN_NULL },
66 { "ds", &ddb_regs.tf_ds, FCN_NULL },
67 { "es", &ddb_regs.tf_es, FCN_NULL },
68 { "fs", &ddb_regs.tf_fs, FCN_NULL },
69#if 0
70 { "gs", &ddb_regs.tf_gs, FCN_NULL },
71#endif
72 { "ss", &ddb_regs.tf_ss, FCN_NULL },
73 { "eax", &ddb_regs.tf_eax, FCN_NULL },
74 { "ecx", &ddb_regs.tf_ecx, FCN_NULL },
75 { "edx", &ddb_regs.tf_edx, FCN_NULL },
76 { "ebx", &ddb_regs.tf_ebx, FCN_NULL },
77 { "esp", &ddb_regs.tf_esp, FCN_NULL },
78 { "ebp", &ddb_regs.tf_ebp, FCN_NULL },
79 { "esi", &ddb_regs.tf_esi, FCN_NULL },
80 { "edi", &ddb_regs.tf_edi, FCN_NULL },
81 { "eip", &ddb_regs.tf_eip, FCN_NULL },
82 { "efl", &ddb_regs.tf_eflags, FCN_NULL },
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};
92struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
93
94/*
95 * Stack trace.
96 */
97#define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK)
98
99struct i386_frame {
100 struct i386_frame *f_frame;
101 int f_retaddr;
102 int f_arg0;
103};
104
105#define NORMAL 0
106#define TRAP 1
107#define INTERRUPT 2
108#define SYSCALL 3
109
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110static void db_nextframe (struct i386_frame **, db_addr_t *);
111static int db_numargs (struct i386_frame *);
112static void db_print_stack_entry (const char *, int, char **, int *, db_addr_t);
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113
114
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115static char * watchtype_str (int type);
116int i386_set_watch (int watchnum, unsigned int watchaddr,
117 int size, int access, struct dbreg * d);
118int i386_clr_watch (int watchnum, struct dbreg * d);
119int db_md_set_watchpoint (db_expr_t addr, db_expr_t size);
120int db_md_clr_watchpoint (db_expr_t addr, db_expr_t size);
121void db_md_list_watchpoints (void);
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122
123
124/*
125 * Figure out how many arguments were passed into the frame at "fp".
126 */
127static int
128db_numargs(fp)
129 struct i386_frame *fp;
130{
131 int *argp;
132 int inst;
133 int args;
134
135 argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE);
136 /*
137 * XXX etext is wrong for LKMs. We should attempt to interpret
138 * the instruction at the return address in all cases. This
139 * may require better fault handling.
140 */
141 if (argp < (int *)btext || argp >= (int *)etext) {
142 args = 5;
143 } else {
144 inst = db_get_value((int)argp, 4, FALSE);
145 if ((inst & 0xff) == 0x59) /* popl %ecx */
146 args = 1;
147 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
148 args = ((inst >> 16) & 0xff) / 4;
149 else
150 args = 5;
151 }
152 return (args);
153}
154
155static void
156db_print_stack_entry(name, narg, argnp, argp, callpc)
157 const char *name;
158 int narg;
159 char **argnp;
160 int *argp;
161 db_addr_t callpc;
162{
163 db_printf("%s(", name);
164 while (narg) {
165 if (argnp)
166 db_printf("%s=", *argnp++);
167 db_printf("%r", db_get_value((int)argp, 4, FALSE));
168 argp++;
169 if (--narg != 0)
170 db_printf(",");
171 }
172 db_printf(") at ");
173 db_printsym(callpc, DB_STGY_PROC);
174 db_printf("\n");
175}
176
177/*
178 * Figure out the next frame up in the call stack.
179 */
180static void
181db_nextframe(fp, ip)
182 struct i386_frame **fp; /* in/out */
183 db_addr_t *ip; /* out */
184{
185 struct trapframe *tf;
186 int frame_type;
187 int eip, esp, ebp;
188 db_expr_t offset;
189 const char *sym, *name;
190
191 eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE);
192 ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE);
193
194 /*
195 * Figure out frame type.
196 */
197
198 frame_type = NORMAL;
199
200 sym = db_search_symbol(eip, DB_STGY_ANY, &offset);
201 db_symbol_values(sym, &name, NULL);
202 if (name != NULL) {
203 if (!strcmp(name, "calltrap")) {
204 frame_type = TRAP;
205 } else if (!strncmp(name, "Xresume", 7)) {
206 frame_type = INTERRUPT;
207 } else if (!strcmp(name, "_Xsyscall")) {
208 frame_type = SYSCALL;
209 }
210 }
211
212 /*
213 * Normal frames need no special processing.
214 */
215 if (frame_type == NORMAL) {
216 *ip = (db_addr_t) eip;
217 *fp = (struct i386_frame *) ebp;
218 return;
219 }
220
221 db_print_stack_entry(name, 0, 0, 0, eip);
222
223 /*
224 * Point to base of trapframe which is just above the
225 * current frame.
226 */
227 tf = (struct trapframe *) ((int)*fp + 8);
228
229 esp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_esp : (int)&tf->tf_esp;
230 switch (frame_type) {
231 case TRAP:
232 if (INKERNEL((int) tf)) {
233 eip = tf->tf_eip;
234 ebp = tf->tf_ebp;
235 db_printf(
236 "--- trap %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
237 tf->tf_trapno, eip, esp, ebp);
238 }
239 break;
240 case SYSCALL:
241 if (INKERNEL((int) tf)) {
242 eip = tf->tf_eip;
243 ebp = tf->tf_ebp;
244 db_printf(
245 "--- syscall %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
246 tf->tf_eax, eip, esp, ebp);
247 }
248 break;
249 case INTERRUPT:
250 tf = (struct trapframe *)((int)*fp + 16);
251 if (INKERNEL((int) tf)) {
252 eip = tf->tf_eip;
253 ebp = tf->tf_ebp;
254 db_printf(
255 "--- interrupt, eip = %#r, esp = %#r, ebp = %#r ---\n",
256 eip, esp, ebp);
257 }
258 break;
259 default:
260 break;
261 }
262
263 *ip = (db_addr_t) eip;
264 *fp = (struct i386_frame *) ebp;
265}
266
267void
268db_stack_trace_cmd(addr, have_addr, count, modif)
269 db_expr_t addr;
270 boolean_t have_addr;
271 db_expr_t count;
272 char *modif;
273{
274 struct i386_frame *frame;
275 int *argp;
276 db_addr_t callpc;
277 boolean_t first;
278 struct pcb *pcb;
279 struct proc *p;
280 pid_t pid;
281
282 if (count == -1)
283 count = 1024;
284
285 if (!have_addr) {
286 frame = (struct i386_frame *)ddb_regs.tf_ebp;
287 if (frame == NULL)
288 frame = (struct i386_frame *)(ddb_regs.tf_esp - 4);
289 callpc = (db_addr_t)ddb_regs.tf_eip;
290 } else if (!INKERNEL(addr)) {
291 pid = (addr % 16) + ((addr >> 4) % 16) * 10 +
292 ((addr >> 8) % 16) * 100 + ((addr >> 12) % 16) * 1000 +
293 ((addr >> 16) % 16) * 10000;
294 /*
295 * The pcb for curproc is not valid at this point,
296 * so fall back to the default case.
297 */
298 if ((curproc != NULL) && (pid == curproc->p_pid)) {
299 frame = (struct i386_frame *)ddb_regs.tf_ebp;
300 if (frame == NULL)
301 frame = (struct i386_frame *)
302 (ddb_regs.tf_esp - 4);
303 callpc = (db_addr_t)ddb_regs.tf_eip;
304 } else {
305
306 /* sx_slock(&allproc_lock); */
f62004ad 307 FOREACH_PROC_IN_SYSTEM(p) {
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308 if (p->p_pid == pid)
309 break;
310 }
311 /* sx_sunlock(&allproc_lock); */
312 if (p == NULL) {
313 db_printf("pid %d not found\n", pid);
314 return;
315 }
316 if ((p->p_flag & P_INMEM) == 0) {
317 db_printf("pid %d swapped out\n", pid);
318 return;
319 }
b7c628e4 320 pcb = p->p_thread->td_pcb;
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321 frame = (struct i386_frame *)pcb->pcb_ebp;
322 if (frame == NULL)
323 frame = (struct i386_frame *)
324 (pcb->pcb_esp - 4);
325 callpc = (db_addr_t)pcb->pcb_eip;
326 }
327 } else {
328 frame = (struct i386_frame *)addr;
329 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
330 }
331
332 first = TRUE;
333 while (count--) {
334 struct i386_frame *actframe;
335 int narg;
336 const char * name;
337 db_expr_t offset;
338 c_db_sym_t sym;
339#define MAXNARG 16
340 char *argnames[MAXNARG], **argnp = NULL;
341
342 sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
343 db_symbol_values(sym, &name, NULL);
344
345 /*
346 * Attempt to determine a (possibly fake) frame that gives
347 * the caller's pc. It may differ from `frame' if the
348 * current function never sets up a standard frame or hasn't
349 * set one up yet or has just discarded one. The last two
350 * cases can be guessed fairly reliably for code generated
351 * by gcc. The first case is too much trouble to handle in
352 * general because the amount of junk on the stack depends
353 * on the pc (the special handling of "calltrap", etc. in
354 * db_nextframe() works because the `next' pc is special).
355 */
356 actframe = frame;
357 if (first) {
358 if (!have_addr) {
359 int instr;
360
361 instr = db_get_value(callpc, 4, FALSE);
362 if ((instr & 0x00ffffff) == 0x00e58955) {
363 /* pushl %ebp; movl %esp, %ebp */
364 actframe = (struct i386_frame *)
365 (ddb_regs.tf_esp - 4);
366 } else if ((instr & 0x0000ffff) == 0x0000e589) {
367 /* movl %esp, %ebp */
368 actframe = (struct i386_frame *)
369 ddb_regs.tf_esp;
370 if (ddb_regs.tf_ebp == 0) {
371 /* Fake caller's frame better. */
372 frame = actframe;
373 }
374 } else if ((instr & 0x000000ff) == 0x000000c3) {
375 /* ret */
376 actframe = (struct i386_frame *)
377 (ddb_regs.tf_esp - 4);
378 } else if (offset == 0) {
379 /* Probably a symbol in assembler code. */
380 actframe = (struct i386_frame *)
381 (ddb_regs.tf_esp - 4);
382 }
383 } else if (!strcmp(name, "fork_trampoline")) {
384 /*
385 * Don't try to walk back on a stack for a
386 * process that hasn't actually been run yet.
387 */
388 db_print_stack_entry(name, 0, 0, 0, callpc);
389 break;
390 }
391 first = FALSE;
392 }
393
394 argp = &actframe->f_arg0;
395 narg = MAXNARG;
396 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
397 argnp = argnames;
398 } else {
399 narg = db_numargs(frame);
400 }
401
402 db_print_stack_entry(name, narg, argnp, argp, callpc);
403
404 if (actframe != frame) {
405 /* `frame' belongs to caller. */
406 callpc = (db_addr_t)
407 db_get_value((int)&actframe->f_retaddr, 4, FALSE);
408 continue;
409 }
410
411 db_nextframe(&frame, &callpc);
412
413 if (INKERNEL((int) callpc) && !INKERNEL((int) frame)) {
414 sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
415 db_symbol_values(sym, &name, NULL);
416 db_print_stack_entry(name, 0, 0, 0, callpc);
417 break;
418 }
419 if (!INKERNEL((int) frame)) {
420 break;
421 }
422 }
423}
424
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425void
426db_print_backtrace(void)
427{
428 register_t ebp;
429
430 __asm __volatile("movl %%ebp, %0" : "=r" (ebp));
431 db_stack_trace_cmd(ebp, 1, -1, NULL);
432}
433
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434#define DB_DRX_FUNC(reg) \
435int \
436db_ ## reg (vp, valuep, op) \
437 struct db_variable *vp; \
438 db_expr_t * valuep; \
439 int op; \
440{ \
441 if (op == DB_VAR_GET) \
442 *valuep = r ## reg (); \
443 else \
444 load_ ## reg (*valuep); \
445 \
446 return(0); \
447}
448
449DB_DRX_FUNC(dr0)
450DB_DRX_FUNC(dr1)
451DB_DRX_FUNC(dr2)
452DB_DRX_FUNC(dr3)
453DB_DRX_FUNC(dr4)
454DB_DRX_FUNC(dr5)
455DB_DRX_FUNC(dr6)
456DB_DRX_FUNC(dr7)
457
458
459
460int
461i386_set_watch(watchnum, watchaddr, size, access, d)
462 int watchnum;
463 unsigned int watchaddr;
464 int size;
465 int access;
466 struct dbreg * d;
467{
468 int i;
469 unsigned int mask;
470
471 if (watchnum == -1) {
472 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
473 if ((d->dr7 & mask) == 0)
474 break;
475 if (i < 4)
476 watchnum = i;
477 else
478 return (-1);
479 }
480
481 switch (access) {
482 case DBREG_DR7_EXEC:
483 size = 1; /* size must be 1 for an execution breakpoint */
484 /* fall through */
485 case DBREG_DR7_WRONLY:
486 case DBREG_DR7_RDWR:
487 break;
488 default : return (-1); break;
489 }
490
491 /*
492 * we can watch a 1, 2, or 4 byte sized location
493 */
494 switch (size) {
495 case 1 : mask = 0x00; break;
496 case 2 : mask = 0x01 << 2; break;
497 case 4 : mask = 0x03 << 2; break;
498 default : return (-1); break;
499 }
500
501 mask |= access;
502
503 /* clear the bits we are about to affect */
504 d->dr7 &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
505
506 /* set drN register to the address, N=watchnum */
507 DBREG_DRX(d,watchnum) = watchaddr;
508
509 /* enable the watchpoint */
510 d->dr7 |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
511
512 return (watchnum);
513}
514
515
516int
517i386_clr_watch(watchnum, d)
518 int watchnum;
519 struct dbreg * d;
520{
521
522 if (watchnum < 0 || watchnum >= 4)
523 return (-1);
524
525 d->dr7 = d->dr7 & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
526 DBREG_DRX(d,watchnum) = 0;
527
528 return (0);
529}
530
531
532int
533db_md_set_watchpoint(addr, size)
534 db_expr_t addr;
535 db_expr_t size;
536{
537 int avail, wsize;
538 int i;
539 struct dbreg d;
540
541 fill_dbregs(NULL, &d);
542
543 avail = 0;
544 for(i=0; i<4; i++) {
545 if ((d.dr7 & (3 << (i*2))) == 0)
546 avail++;
547 }
548
549 if (avail*4 < size)
550 return (-1);
551
552 for (i=0; i<4 && (size != 0); i++) {
553 if ((d.dr7 & (3<<(i*2))) == 0) {
554 if (size > 4)
555 wsize = 4;
556 else
557 wsize = size;
558 if (wsize == 3)
559 wsize++;
560 i386_set_watch(i, addr, wsize,
561 DBREG_DR7_WRONLY, &d);
562 addr += wsize;
563 size -= wsize;
564 }
565 }
566
567 set_dbregs(NULL, &d);
568
569 return(0);
570}
571
572
573int
574db_md_clr_watchpoint(addr, size)
575 db_expr_t addr;
576 db_expr_t size;
577{
578 int i;
579 struct dbreg d;
580
581 fill_dbregs(NULL, &d);
582
583 for(i=0; i<4; i++) {
584 if (d.dr7 & (3 << (i*2))) {
585 if ((DBREG_DRX((&d), i) >= addr) &&
586 (DBREG_DRX((&d), i) < addr+size))
587 i386_clr_watch(i, &d);
588
589 }
590 }
591
592 set_dbregs(NULL, &d);
593
594 return(0);
595}
596
597
598static
599char *
600watchtype_str(type)
601 int type;
602{
603 switch (type) {
604 case DBREG_DR7_EXEC : return "execute"; break;
605 case DBREG_DR7_RDWR : return "read/write"; break;
606 case DBREG_DR7_WRONLY : return "write"; break;
607 default : return "invalid"; break;
608 }
609}
610
611
612void
613db_md_list_watchpoints()
614{
615 int i;
616 struct dbreg d;
617
618 fill_dbregs(NULL, &d);
619
620 db_printf("\nhardware watchpoints:\n");
621 db_printf(" watch status type len address\n"
622 " ----- -------- ---------- --- ----------\n");
623 for (i=0; i<4; i++) {
624 if (d.dr7 & (0x03 << (i*2))) {
625 unsigned type, len;
626 type = (d.dr7 >> (16+(i*4))) & 3;
627 len = (d.dr7 >> (16+(i*4)+2)) & 3;
628 db_printf(" %-5d %-8s %10s %3d 0x%08x\n",
629 i, "enabled", watchtype_str(type),
630 len+1, DBREG_DRX((&d),i));
631 }
632 else {
633 db_printf(" %-5d disabled\n", i);
634 }
635 }
636
637 db_printf("\ndebug register values:\n");
638 for (i=0; i<8; i++) {
639 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d),i));
640 }
641 db_printf("\n");
642}
643
644