2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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.
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.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
26 * $FreeBSD: src/sys/i386/i386/db_trace.c,v 1.35.2.3 2002/02/21 22:31:25 silby Exp $
27 * $DragonFly: src/sys/i386/i386/Attic/db_trace.c,v 1.5 2003/08/03 10:07:40 hmp Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/linker_set.h>
36 #include <machine/cpu.h>
37 #include <machine/md_var.h>
38 #include <machine/reg.h>
41 #include <vm/vm_param.h>
43 #include <vm/vm_map.h>
48 #include <ddb/db_access.h>
49 #include <ddb/db_sym.h>
50 #include <ddb/db_variables.h>
62 * Machine register set.
64 struct 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 },
70 { "gs", &ddb_regs.tf_gs, FCN_NULL },
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 },
92 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
97 #define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK)
100 struct i386_frame *f_frame;
110 static void db_nextframe __P((struct i386_frame **, db_addr_t *));
111 static int db_numargs __P((struct i386_frame *));
112 static void db_print_stack_entry __P((const char *, int, char **, int *, db_addr_t));
115 static char * watchtype_str __P((int type));
116 int i386_set_watch __P((int watchnum, unsigned int watchaddr,
117 int size, int access, struct dbreg * d));
118 int i386_clr_watch __P((int watchnum, struct dbreg * d));
119 int db_md_set_watchpoint __P((db_expr_t addr, db_expr_t size));
120 int db_md_clr_watchpoint __P((db_expr_t addr, db_expr_t size));
121 void db_md_list_watchpoints __P((void));
125 * Figure out how many arguments were passed into the frame at "fp".
129 struct i386_frame *fp;
135 argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE);
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.
141 if (argp < (int *)btext || argp >= (int *)etext) {
144 inst = db_get_value((int)argp, 4, FALSE);
145 if ((inst & 0xff) == 0x59) /* popl %ecx */
147 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
148 args = ((inst >> 16) & 0xff) / 4;
156 db_print_stack_entry(name, narg, argnp, argp, callpc)
163 db_printf("%s(", name);
166 db_printf("%s=", *argnp++);
167 db_printf("%r", db_get_value((int)argp, 4, FALSE));
173 db_printsym(callpc, DB_STGY_PROC);
178 * Figure out the next frame up in the call stack.
182 struct i386_frame **fp; /* in/out */
183 db_addr_t *ip; /* out */
185 struct trapframe *tf;
189 const char *sym, *name;
191 eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE);
192 ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE);
195 * Figure out frame type.
200 sym = db_search_symbol(eip, DB_STGY_ANY, &offset);
201 db_symbol_values(sym, &name, NULL);
203 if (!strcmp(name, "calltrap")) {
205 } else if (!strncmp(name, "Xresume", 7)) {
206 frame_type = INTERRUPT;
207 } else if (!strcmp(name, "_Xsyscall")) {
208 frame_type = SYSCALL;
213 * Normal frames need no special processing.
215 if (frame_type == NORMAL) {
216 *ip = (db_addr_t) eip;
217 *fp = (struct i386_frame *) ebp;
221 db_print_stack_entry(name, 0, 0, 0, eip);
224 * Point to base of trapframe which is just above the
227 tf = (struct trapframe *) ((int)*fp + 8);
229 esp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_esp : (int)&tf->tf_esp;
230 switch (frame_type) {
232 if (INKERNEL((int) tf)) {
236 "--- trap %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
237 tf->tf_trapno, eip, esp, ebp);
241 if (INKERNEL((int) tf)) {
245 "--- syscall %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
246 tf->tf_eax, eip, esp, ebp);
250 tf = (struct trapframe *)((int)*fp + 16);
251 if (INKERNEL((int) tf)) {
255 "--- interrupt, eip = %#r, esp = %#r, ebp = %#r ---\n",
263 *ip = (db_addr_t) eip;
264 *fp = (struct i386_frame *) ebp;
268 db_stack_trace_cmd(addr, have_addr, count, modif)
274 struct i386_frame *frame;
286 frame = (struct i386_frame *)ddb_regs.tf_ebp;
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;
295 * The pcb for curproc is not valid at this point,
296 * so fall back to the default case.
298 if ((curproc != NULL) && (pid == curproc->p_pid)) {
299 frame = (struct i386_frame *)ddb_regs.tf_ebp;
301 frame = (struct i386_frame *)
302 (ddb_regs.tf_esp - 4);
303 callpc = (db_addr_t)ddb_regs.tf_eip;
306 /* sx_slock(&allproc_lock); */
307 FOREACH_PROC_IN_SYSTEM(p) {
311 /* sx_sunlock(&allproc_lock); */
313 db_printf("pid %d not found\n", pid);
316 if ((p->p_flag & P_INMEM) == 0) {
317 db_printf("pid %d swapped out\n", pid);
320 pcb = p->p_thread->td_pcb;
321 frame = (struct i386_frame *)pcb->pcb_ebp;
323 frame = (struct i386_frame *)
325 callpc = (db_addr_t)pcb->pcb_eip;
328 frame = (struct i386_frame *)addr;
329 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
334 struct i386_frame *actframe;
340 char *argnames[MAXNARG], **argnp = NULL;
342 sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
343 db_symbol_values(sym, &name, NULL);
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).
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 *)
370 if (ddb_regs.tf_ebp == 0) {
371 /* Fake caller's frame better. */
374 } else if ((instr & 0x000000ff) == 0x000000c3) {
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);
383 } else if (!strcmp(name, "fork_trampoline")) {
385 * Don't try to walk back on a stack for a
386 * process that hasn't actually been run yet.
388 db_print_stack_entry(name, 0, 0, 0, callpc);
394 argp = &actframe->f_arg0;
396 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
399 narg = db_numargs(frame);
402 db_print_stack_entry(name, narg, argnp, argp, callpc);
404 if (actframe != frame) {
405 /* `frame' belongs to caller. */
407 db_get_value((int)&actframe->f_retaddr, 4, FALSE);
411 db_nextframe(&frame, &callpc);
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);
419 if (!INKERNEL((int) frame)) {
426 db_print_backtrace(void)
430 __asm __volatile("movl %%ebp, %0" : "=r" (ebp));
431 db_stack_trace_cmd(ebp, 1, -1, NULL);
434 #define DB_DRX_FUNC(reg) \
436 db_ ## reg (vp, valuep, op) \
437 struct db_variable *vp; \
438 db_expr_t * valuep; \
441 if (op == DB_VAR_GET) \
442 *valuep = r ## reg (); \
444 load_ ## reg (*valuep); \
461 i386_set_watch(watchnum, watchaddr, size, access, d)
463 unsigned int watchaddr;
471 if (watchnum == -1) {
472 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
473 if ((d->dr7 & mask) == 0)
483 size = 1; /* size must be 1 for an execution breakpoint */
485 case DBREG_DR7_WRONLY:
488 default : return (-1); break;
492 * we can watch a 1, 2, or 4 byte sized location
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;
503 /* clear the bits we are about to affect */
504 d->dr7 &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
506 /* set drN register to the address, N=watchnum */
507 DBREG_DRX(d,watchnum) = watchaddr;
509 /* enable the watchpoint */
510 d->dr7 |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
517 i386_clr_watch(watchnum, d)
522 if (watchnum < 0 || watchnum >= 4)
525 d->dr7 = d->dr7 & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
526 DBREG_DRX(d,watchnum) = 0;
533 db_md_set_watchpoint(addr, size)
541 fill_dbregs(NULL, &d);
545 if ((d.dr7 & (3 << (i*2))) == 0)
552 for (i=0; i<4 && (size != 0); i++) {
553 if ((d.dr7 & (3<<(i*2))) == 0) {
560 i386_set_watch(i, addr, wsize,
561 DBREG_DR7_WRONLY, &d);
567 set_dbregs(NULL, &d);
574 db_md_clr_watchpoint(addr, size)
581 fill_dbregs(NULL, &d);
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);
592 set_dbregs(NULL, &d);
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;
613 db_md_list_watchpoints()
618 fill_dbregs(NULL, &d);
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))) {
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));
633 db_printf(" %-5d disabled\n", i);
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));