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 $
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/linker_set.h>
35 #include <machine/cpu.h>
36 #include <machine/md_var.h>
37 #include <machine/reg.h>
40 #include <vm/vm_param.h>
42 #include <vm/vm_map.h>
47 #include <ddb/db_access.h>
48 #include <ddb/db_sym.h>
49 #include <ddb/db_variables.h>
61 * Machine register set.
63 struct db_variable db_regs[] = {
64 { "cs", &ddb_regs.tf_cs, FCN_NULL },
65 { "ds", &ddb_regs.tf_ds, FCN_NULL },
66 { "es", &ddb_regs.tf_es, FCN_NULL },
67 { "fs", &ddb_regs.tf_fs, FCN_NULL },
69 { "gs", &ddb_regs.tf_gs, FCN_NULL },
71 { "ss", &ddb_regs.tf_ss, FCN_NULL },
72 { "eax", &ddb_regs.tf_eax, FCN_NULL },
73 { "ecx", &ddb_regs.tf_ecx, FCN_NULL },
74 { "edx", &ddb_regs.tf_edx, FCN_NULL },
75 { "ebx", &ddb_regs.tf_ebx, FCN_NULL },
76 { "esp", &ddb_regs.tf_esp, FCN_NULL },
77 { "ebp", &ddb_regs.tf_ebp, FCN_NULL },
78 { "esi", &ddb_regs.tf_esi, FCN_NULL },
79 { "edi", &ddb_regs.tf_edi, FCN_NULL },
80 { "eip", &ddb_regs.tf_eip, FCN_NULL },
81 { "efl", &ddb_regs.tf_eflags, FCN_NULL },
82 { "dr0", NULL, db_dr0 },
83 { "dr1", NULL, db_dr1 },
84 { "dr2", NULL, db_dr2 },
85 { "dr3", NULL, db_dr3 },
86 { "dr4", NULL, db_dr4 },
87 { "dr5", NULL, db_dr5 },
88 { "dr6", NULL, db_dr6 },
89 { "dr7", NULL, db_dr7 },
91 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
96 #define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK)
99 struct i386_frame *f_frame;
109 static void db_nextframe __P((struct i386_frame **, db_addr_t *));
110 static int db_numargs __P((struct i386_frame *));
111 static void db_print_stack_entry __P((const char *, int, char **, int *, db_addr_t));
114 static char * watchtype_str __P((int type));
115 int i386_set_watch __P((int watchnum, unsigned int watchaddr,
116 int size, int access, struct dbreg * d));
117 int i386_clr_watch __P((int watchnum, struct dbreg * d));
118 int db_md_set_watchpoint __P((db_expr_t addr, db_expr_t size));
119 int db_md_clr_watchpoint __P((db_expr_t addr, db_expr_t size));
120 void db_md_list_watchpoints __P((void));
124 * Figure out how many arguments were passed into the frame at "fp".
128 struct i386_frame *fp;
134 argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE);
136 * XXX etext is wrong for LKMs. We should attempt to interpret
137 * the instruction at the return address in all cases. This
138 * may require better fault handling.
140 if (argp < (int *)btext || argp >= (int *)etext) {
143 inst = db_get_value((int)argp, 4, FALSE);
144 if ((inst & 0xff) == 0x59) /* popl %ecx */
146 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
147 args = ((inst >> 16) & 0xff) / 4;
155 db_print_stack_entry(name, narg, argnp, argp, callpc)
162 db_printf("%s(", name);
165 db_printf("%s=", *argnp++);
166 db_printf("%r", db_get_value((int)argp, 4, FALSE));
172 db_printsym(callpc, DB_STGY_PROC);
177 * Figure out the next frame up in the call stack.
181 struct i386_frame **fp; /* in/out */
182 db_addr_t *ip; /* out */
184 struct trapframe *tf;
188 const char *sym, *name;
190 eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE);
191 ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE);
194 * Figure out frame type.
199 sym = db_search_symbol(eip, DB_STGY_ANY, &offset);
200 db_symbol_values(sym, &name, NULL);
202 if (!strcmp(name, "calltrap")) {
204 } else if (!strncmp(name, "Xresume", 7)) {
205 frame_type = INTERRUPT;
206 } else if (!strcmp(name, "_Xsyscall")) {
207 frame_type = SYSCALL;
212 * Normal frames need no special processing.
214 if (frame_type == NORMAL) {
215 *ip = (db_addr_t) eip;
216 *fp = (struct i386_frame *) ebp;
220 db_print_stack_entry(name, 0, 0, 0, eip);
223 * Point to base of trapframe which is just above the
226 tf = (struct trapframe *) ((int)*fp + 8);
228 esp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_esp : (int)&tf->tf_esp;
229 switch (frame_type) {
231 if (INKERNEL((int) tf)) {
235 "--- trap %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
236 tf->tf_trapno, eip, esp, ebp);
240 if (INKERNEL((int) tf)) {
244 "--- syscall %#r, eip = %#r, esp = %#r, ebp = %#r ---\n",
245 tf->tf_eax, eip, esp, ebp);
249 tf = (struct trapframe *)((int)*fp + 16);
250 if (INKERNEL((int) tf)) {
254 "--- interrupt, eip = %#r, esp = %#r, ebp = %#r ---\n",
262 *ip = (db_addr_t) eip;
263 *fp = (struct i386_frame *) ebp;
267 db_stack_trace_cmd(addr, have_addr, count, modif)
273 struct i386_frame *frame;
285 frame = (struct i386_frame *)ddb_regs.tf_ebp;
287 frame = (struct i386_frame *)(ddb_regs.tf_esp - 4);
288 callpc = (db_addr_t)ddb_regs.tf_eip;
289 } else if (!INKERNEL(addr)) {
290 pid = (addr % 16) + ((addr >> 4) % 16) * 10 +
291 ((addr >> 8) % 16) * 100 + ((addr >> 12) % 16) * 1000 +
292 ((addr >> 16) % 16) * 10000;
294 * The pcb for curproc is not valid at this point,
295 * so fall back to the default case.
297 if ((curproc != NULL) && (pid == curproc->p_pid)) {
298 frame = (struct i386_frame *)ddb_regs.tf_ebp;
300 frame = (struct i386_frame *)
301 (ddb_regs.tf_esp - 4);
302 callpc = (db_addr_t)ddb_regs.tf_eip;
305 /* sx_slock(&allproc_lock); */
306 LIST_FOREACH(p, &allproc, p_list) {
310 /* sx_sunlock(&allproc_lock); */
312 db_printf("pid %d not found\n", pid);
315 if ((p->p_flag & P_INMEM) == 0) {
316 db_printf("pid %d swapped out\n", pid);
319 pcb = &p->p_addr->u_pcb;
320 frame = (struct i386_frame *)pcb->pcb_ebp;
322 frame = (struct i386_frame *)
324 callpc = (db_addr_t)pcb->pcb_eip;
327 frame = (struct i386_frame *)addr;
328 callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
333 struct i386_frame *actframe;
339 char *argnames[MAXNARG], **argnp = NULL;
341 sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
342 db_symbol_values(sym, &name, NULL);
345 * Attempt to determine a (possibly fake) frame that gives
346 * the caller's pc. It may differ from `frame' if the
347 * current function never sets up a standard frame or hasn't
348 * set one up yet or has just discarded one. The last two
349 * cases can be guessed fairly reliably for code generated
350 * by gcc. The first case is too much trouble to handle in
351 * general because the amount of junk on the stack depends
352 * on the pc (the special handling of "calltrap", etc. in
353 * db_nextframe() works because the `next' pc is special).
360 instr = db_get_value(callpc, 4, FALSE);
361 if ((instr & 0x00ffffff) == 0x00e58955) {
362 /* pushl %ebp; movl %esp, %ebp */
363 actframe = (struct i386_frame *)
364 (ddb_regs.tf_esp - 4);
365 } else if ((instr & 0x0000ffff) == 0x0000e589) {
366 /* movl %esp, %ebp */
367 actframe = (struct i386_frame *)
369 if (ddb_regs.tf_ebp == 0) {
370 /* Fake caller's frame better. */
373 } else if ((instr & 0x000000ff) == 0x000000c3) {
375 actframe = (struct i386_frame *)
376 (ddb_regs.tf_esp - 4);
377 } else if (offset == 0) {
378 /* Probably a symbol in assembler code. */
379 actframe = (struct i386_frame *)
380 (ddb_regs.tf_esp - 4);
382 } else if (!strcmp(name, "fork_trampoline")) {
384 * Don't try to walk back on a stack for a
385 * process that hasn't actually been run yet.
387 db_print_stack_entry(name, 0, 0, 0, callpc);
393 argp = &actframe->f_arg0;
395 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
398 narg = db_numargs(frame);
401 db_print_stack_entry(name, narg, argnp, argp, callpc);
403 if (actframe != frame) {
404 /* `frame' belongs to caller. */
406 db_get_value((int)&actframe->f_retaddr, 4, FALSE);
410 db_nextframe(&frame, &callpc);
412 if (INKERNEL((int) callpc) && !INKERNEL((int) frame)) {
413 sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
414 db_symbol_values(sym, &name, NULL);
415 db_print_stack_entry(name, 0, 0, 0, callpc);
418 if (!INKERNEL((int) frame)) {
424 #define DB_DRX_FUNC(reg) \
426 db_ ## reg (vp, valuep, op) \
427 struct db_variable *vp; \
428 db_expr_t * valuep; \
431 if (op == DB_VAR_GET) \
432 *valuep = r ## reg (); \
434 load_ ## reg (*valuep); \
451 i386_set_watch(watchnum, watchaddr, size, access, d)
453 unsigned int watchaddr;
461 if (watchnum == -1) {
462 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
463 if ((d->dr7 & mask) == 0)
473 size = 1; /* size must be 1 for an execution breakpoint */
475 case DBREG_DR7_WRONLY:
478 default : return (-1); break;
482 * we can watch a 1, 2, or 4 byte sized location
485 case 1 : mask = 0x00; break;
486 case 2 : mask = 0x01 << 2; break;
487 case 4 : mask = 0x03 << 2; break;
488 default : return (-1); break;
493 /* clear the bits we are about to affect */
494 d->dr7 &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
496 /* set drN register to the address, N=watchnum */
497 DBREG_DRX(d,watchnum) = watchaddr;
499 /* enable the watchpoint */
500 d->dr7 |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
507 i386_clr_watch(watchnum, d)
512 if (watchnum < 0 || watchnum >= 4)
515 d->dr7 = d->dr7 & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
516 DBREG_DRX(d,watchnum) = 0;
523 db_md_set_watchpoint(addr, size)
531 fill_dbregs(NULL, &d);
535 if ((d.dr7 & (3 << (i*2))) == 0)
542 for (i=0; i<4 && (size != 0); i++) {
543 if ((d.dr7 & (3<<(i*2))) == 0) {
550 i386_set_watch(i, addr, wsize,
551 DBREG_DR7_WRONLY, &d);
557 set_dbregs(NULL, &d);
564 db_md_clr_watchpoint(addr, size)
571 fill_dbregs(NULL, &d);
574 if (d.dr7 & (3 << (i*2))) {
575 if ((DBREG_DRX((&d), i) >= addr) &&
576 (DBREG_DRX((&d), i) < addr+size))
577 i386_clr_watch(i, &d);
582 set_dbregs(NULL, &d);
594 case DBREG_DR7_EXEC : return "execute"; break;
595 case DBREG_DR7_RDWR : return "read/write"; break;
596 case DBREG_DR7_WRONLY : return "write"; break;
597 default : return "invalid"; break;
603 db_md_list_watchpoints()
608 fill_dbregs(NULL, &d);
610 db_printf("\nhardware watchpoints:\n");
611 db_printf(" watch status type len address\n"
612 " ----- -------- ---------- --- ----------\n");
613 for (i=0; i<4; i++) {
614 if (d.dr7 & (0x03 << (i*2))) {
616 type = (d.dr7 >> (16+(i*4))) & 3;
617 len = (d.dr7 >> (16+(i*4)+2)) & 3;
618 db_printf(" %-5d %-8s %10s %3d 0x%08x\n",
619 i, "enabled", watchtype_str(type),
620 len+1, DBREG_DRX((&d),i));
623 db_printf(" %-5d disabled\n", i);
627 db_printf("\ndebug register values:\n");
628 for (i=0; i<8; i++) {
629 db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d),i));