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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "opt_compat.h"
32 #include <sys/param.h>
33 #include <sys/systm.h>
37 #include <sys/stack.h>
38 #include <sys/sysent.h>
40 #include <machine/cpu.h>
41 #include <machine/md_var.h>
42 #include <machine/pcb.h>
43 #include <machine/reg.h>
44 #include <machine/stack.h>
47 #include <vm/vm_param.h>
51 #include <ddb/db_access.h>
52 #include <ddb/db_sym.h>
53 #include <ddb/db_variables.h>
55 static db_varfcn_t db_dr0;
56 static db_varfcn_t db_dr1;
57 static db_varfcn_t db_dr2;
58 static db_varfcn_t db_dr3;
59 static db_varfcn_t db_dr4;
60 static db_varfcn_t db_dr5;
61 static db_varfcn_t db_dr6;
62 static db_varfcn_t db_dr7;
63 static db_varfcn_t db_frame;
64 static db_varfcn_t db_rsp;
65 static db_varfcn_t db_ss;
67 CTASSERT(sizeof(struct dbreg) == sizeof(((struct pcpu *)NULL)->pc_dbreg));
70 * Machine register set.
72 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
73 struct db_variable db_regs[] = {
74 { "cs", DB_OFFSET(tf_cs), db_frame },
75 { "ds", DB_OFFSET(tf_ds), db_frame },
76 { "es", DB_OFFSET(tf_es), db_frame },
77 { "fs", DB_OFFSET(tf_fs), db_frame },
78 { "gs", DB_OFFSET(tf_gs), db_frame },
79 { "ss", NULL, db_ss },
80 { "rax", DB_OFFSET(tf_rax), db_frame },
81 { "rcx", DB_OFFSET(tf_rcx), db_frame },
82 { "rdx", DB_OFFSET(tf_rdx), db_frame },
83 { "rbx", DB_OFFSET(tf_rbx), db_frame },
84 { "rsp", NULL, db_rsp },
85 { "rbp", DB_OFFSET(tf_rbp), db_frame },
86 { "rsi", DB_OFFSET(tf_rsi), db_frame },
87 { "rdi", DB_OFFSET(tf_rdi), db_frame },
88 { "r8", DB_OFFSET(tf_r8), db_frame },
89 { "r9", DB_OFFSET(tf_r9), db_frame },
90 { "r10", DB_OFFSET(tf_r10), db_frame },
91 { "r11", DB_OFFSET(tf_r11), db_frame },
92 { "r12", DB_OFFSET(tf_r12), db_frame },
93 { "r13", DB_OFFSET(tf_r13), db_frame },
94 { "r14", DB_OFFSET(tf_r14), db_frame },
95 { "r15", DB_OFFSET(tf_r15), db_frame },
96 { "rip", DB_OFFSET(tf_rip), db_frame },
97 { "rflags", DB_OFFSET(tf_rflags), db_frame },
98 #define DB_N_SHOW_REGS 24 /* Don't show registers after here. */
99 { "dr0", NULL, db_dr0 },
100 { "dr1", NULL, db_dr1 },
101 { "dr2", NULL, db_dr2 },
102 { "dr3", NULL, db_dr3 },
103 { "dr4", NULL, db_dr4 },
104 { "dr5", NULL, db_dr5 },
105 { "dr6", NULL, db_dr6 },
106 { "dr7", NULL, db_dr7 },
108 struct db_variable *db_eregs = db_regs + DB_N_SHOW_REGS;
110 #define DB_DRX_FUNC(reg) \
112 db_ ## reg (vp, valuep, op) \
113 struct db_variable *vp; \
114 db_expr_t * valuep; \
117 if (op == DB_VAR_GET) \
118 *valuep = r ## reg (); \
120 load_ ## reg (*valuep); \
134 get_rsp(struct trapframe *tf)
136 return ((ISPL(tf->tf_cs)) ? tf->tf_rsp :
137 (db_expr_t)tf + offsetof(struct trapframe, tf_rsp));
141 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
145 if (kdb_frame == NULL)
148 reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
149 if (op == DB_VAR_GET)
157 db_rsp(struct db_variable *vp, db_expr_t *valuep, int op)
160 if (kdb_frame == NULL)
163 if (op == DB_VAR_GET)
164 *valuep = get_rsp(kdb_frame);
165 else if (ISPL(kdb_frame->tf_cs))
166 kdb_frame->tf_rsp = *valuep;
171 db_ss(struct db_variable *vp, db_expr_t *valuep, int op)
174 if (kdb_frame == NULL)
177 if (op == DB_VAR_GET)
178 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss();
179 else if (ISPL(kdb_frame->tf_cs))
180 kdb_frame->tf_ss = *valuep;
188 #define TRAP_INTERRUPT 5
190 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *);
191 static int db_numargs(struct amd64_frame *);
192 static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t,
194 static void decode_syscall(int, struct thread *);
196 static const char * watchtype_str(int type);
197 int amd64_set_watch(int watchnum, unsigned long watchaddr, int size,
198 int access, struct dbreg *d);
199 int amd64_clr_watch(int watchnum, struct dbreg *d);
202 * Figure out how many arguments were passed into the frame at "fp".
206 struct amd64_frame *fp;
209 return (0); /* regparm, needs dwarf2 info */
215 argp = (long *)db_get_value((long)&fp->f_retaddr, 8, FALSE);
217 * XXX etext is wrong for LKMs. We should attempt to interpret
218 * the instruction at the return address in all cases. This
219 * may require better fault handling.
221 if (argp < (long *)btext || argp >= (long *)etext) {
224 inst = db_get_value((long)argp, 4, FALSE);
225 if ((inst & 0xff) == 0x59) /* popl %ecx */
227 else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */
228 args = ((inst >> 16) & 0xff) / 4;
237 db_print_stack_entry(name, narg, argnp, argp, callpc, frame)
245 db_printf("%s(", name);
249 db_printf("%s=", *argnp++);
250 db_printf("%lr", (long)db_get_value((long)argp, 8, FALSE));
257 db_printsym(callpc, DB_STGY_PROC);
259 db_printf("/frame 0x%lx", (register_t)frame);
264 decode_syscall(int number, struct thread *td)
272 db_printf(" (%d", number);
273 p = (td != NULL) ? td->td_proc : NULL;
274 if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
275 f = p->p_sysent->sv_table[number].sy_call;
276 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
277 if (sym != DB_SYM_NULL && diff == 0) {
278 db_symbol_values(sym, &symname, NULL);
279 db_printf(", %s, %s", p->p_sysent->sv_name, symname);
286 * Figure out the next frame up in the call stack.
289 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td)
291 struct trapframe *tf;
298 rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE);
299 rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE);
302 * Figure out frame type. We look at the address just before
303 * the saved instruction pointer as the saved EIP is after the
304 * call function, and if the function being called is marked as
305 * dead (such as panic() at the end of dblfault_handler()), then
306 * the instruction at the saved EIP will be part of a different
307 * function (syscall() in this example) rather than the one that
308 * actually made the call.
311 sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset);
312 db_symbol_values(sym, &name, NULL);
314 if (strcmp(name, "calltrap") == 0 ||
315 strcmp(name, "fork_trampoline") == 0 ||
316 strcmp(name, "nmi_calltrap") == 0 ||
317 strcmp(name, "Xdblfault") == 0)
319 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
320 strncmp(name, "Xapic_isr", 9) == 0 ||
321 strcmp(name, "Xtimerint") == 0 ||
322 strcmp(name, "Xipi_intr_bitmap_handler") == 0 ||
323 strcmp(name, "Xcpustop") == 0 ||
324 strcmp(name, "Xcpususpend") == 0 ||
325 strcmp(name, "Xrendezvous") == 0)
326 frame_type = INTERRUPT;
327 else if (strcmp(name, "Xfast_syscall") == 0)
328 frame_type = SYSCALL;
329 #ifdef COMPAT_FREEBSD32
330 else if (strcmp(name, "Xint0x80_syscall") == 0)
331 frame_type = SYSCALL;
333 /* XXX: These are interrupts with trap frames. */
334 else if (strcmp(name, "Xtimerint") == 0 ||
335 strcmp(name, "Xcpustop") == 0 ||
336 strcmp(name, "Xcpususpend") == 0 ||
337 strcmp(name, "Xrendezvous") == 0 ||
338 strcmp(name, "Xipi_intr_bitmap_handler") == 0)
339 frame_type = TRAP_INTERRUPT;
343 * Normal frames need no special processing.
345 if (frame_type == NORMAL) {
346 *ip = (db_addr_t) rip;
347 *fp = (struct amd64_frame *) rbp;
351 db_print_stack_entry(name, 0, 0, 0, rip, &(*fp)->f_frame);
354 * Point to base of trapframe which is just above the
357 tf = (struct trapframe *)((long)*fp + 16);
359 if (INKERNEL((long) tf)) {
363 switch (frame_type) {
365 db_printf("--- trap %#r", tf->tf_trapno);
368 db_printf("--- syscall");
369 decode_syscall(tf->tf_rax, td);
373 db_printf("--- interrupt");
376 panic("The moon has moved again.");
378 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip,
382 *ip = (db_addr_t) rip;
383 *fp = (struct amd64_frame *) rbp;
387 db_backtrace(struct thread *td, struct trapframe *tf,
388 struct amd64_frame *frame, db_addr_t pc, int count)
390 struct amd64_frame *actframe;
392 char *argnames[MAXNARG], **argnp = NULL;
404 while (count-- && !db_pager_quit) {
405 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
406 db_symbol_values(sym, &name, NULL);
409 * Attempt to determine a (possibly fake) frame that gives
410 * the caller's pc. It may differ from `frame' if the
411 * current function never sets up a standard frame or hasn't
412 * set one up yet or has just discarded one. The last two
413 * cases can be guessed fairly reliably for code generated
414 * by gcc. The first case is too much trouble to handle in
415 * general because the amount of junk on the stack depends
416 * on the pc (the special handling of "calltrap", etc. in
417 * db_nextframe() works because the `next' pc is special).
424 instr = db_get_value(pc, 4, FALSE);
425 if ((instr & 0xffffffff) == 0xe5894855) {
426 /* pushq %rbp; movq %rsp, %rbp */
427 actframe = (void *)(get_rsp(tf) - 8);
428 } else if ((instr & 0xffffff) == 0xe58948) {
429 /* movq %rsp, %rbp */
430 actframe = (void *)get_rsp(tf);
431 if (tf->tf_rbp == 0) {
432 /* Fake frame better. */
435 } else if ((instr & 0xff) == 0xc3) {
437 actframe = (void *)(get_rsp(tf) - 8);
438 } else if (offset == 0) {
439 /* Probably an assembler symbol. */
440 actframe = (void *)(get_rsp(tf) - 8);
442 } else if (strcmp(name, "fork_trampoline") == 0) {
444 * Don't try to walk back on a stack for a
445 * process that hasn't actually been run yet.
447 db_print_stack_entry(name, 0, 0, 0, pc,
454 argp = &actframe->f_arg0;
456 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
459 narg = db_numargs(frame);
462 db_print_stack_entry(name, narg, argnp, argp, pc, actframe);
464 if (actframe != frame) {
465 /* `frame' belongs to caller. */
467 db_get_value((long)&actframe->f_retaddr, 8, FALSE);
471 db_nextframe(&frame, &pc, td);
473 if (INKERNEL((long)pc) && !INKERNEL((long)frame)) {
474 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
475 db_symbol_values(sym, &name, NULL);
476 db_print_stack_entry(name, 0, 0, 0, pc, frame);
479 if (!INKERNEL((long) frame)) {
490 struct amd64_frame *frame;
494 __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
495 frame = (struct amd64_frame *)rbp;
496 callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE);
497 frame = frame->f_frame;
498 db_backtrace(curthread, NULL, frame, callpc, -1);
502 db_trace_thread(struct thread *thr, int count)
506 ctx = kdb_thr_ctx(thr);
507 return (db_backtrace(thr, NULL, (struct amd64_frame *)ctx->pcb_rbp,
508 ctx->pcb_rip, count));
512 amd64_set_watch(watchnum, watchaddr, size, access, d)
514 unsigned long watchaddr;
521 if (watchnum == -1) {
522 for (i = 0; i < 4; i++)
523 if (!DBREG_DR7_ENABLED(d->dr[7], i))
533 size = 1; /* size must be 1 for an execution breakpoint */
535 case DBREG_DR7_WRONLY:
543 * we can watch a 1, 2, 4, or 8 byte sized location
547 len = DBREG_DR7_LEN_1;
550 len = DBREG_DR7_LEN_2;
553 len = DBREG_DR7_LEN_4;
556 len = DBREG_DR7_LEN_8;
562 /* clear the bits we are about to affect */
563 d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
565 /* set drN register to the address, N=watchnum */
566 DBREG_DRX(d, watchnum) = watchaddr;
568 /* enable the watchpoint */
569 d->dr[7] |= DBREG_DR7_SET(watchnum, len, access,
570 DBREG_DR7_GLOBAL_ENABLE);
577 amd64_clr_watch(watchnum, d)
582 if (watchnum < 0 || watchnum >= 4)
585 d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
586 DBREG_DRX(d, watchnum) = 0;
593 db_md_set_watchpoint(addr, size)
599 int avail, c, cpu, i, wsize;
601 d = (struct dbreg *)PCPU_PTR(dbreg);
602 cpu = PCPU_GET(cpuid);
603 fill_dbregs(NULL, d);
606 for (i = 0; i < 4; i++) {
607 if (!DBREG_DR7_ENABLED(d->dr[7], i))
611 if (avail * 8 < size)
614 for (i = 0; i < 4 && size > 0; i++) {
615 if (!DBREG_DR7_ENABLED(d->dr[7], i)) {
616 if (size >= 8 || (avail == 1 && size > 4))
622 amd64_set_watch(i, addr, wsize, DBREG_DR7_WRONLY, d);
634 memcpy(pc->pc_dbreg, d, sizeof(*d));
635 pc->pc_dbreg_cmd = PC_DBREG_CMD_LOAD;
642 db_md_clr_watchpoint(addr, size)
650 d = (struct dbreg *)PCPU_PTR(dbreg);
651 cpu = PCPU_GET(cpuid);
652 fill_dbregs(NULL, d);
654 for (i = 0; i < 4; i++) {
655 if (DBREG_DR7_ENABLED(d->dr[7], i)) {
656 if (DBREG_DRX((d), i) >= addr &&
657 DBREG_DRX((d), i) < addr + size)
658 amd64_clr_watch(i, d);
668 memcpy(pc->pc_dbreg, d, sizeof(*d));
669 pc->pc_dbreg_cmd = PC_DBREG_CMD_LOAD;
681 case DBREG_DR7_EXEC : return "execute"; break;
682 case DBREG_DR7_RDWR : return "read/write"; break;
683 case DBREG_DR7_WRONLY : return "write"; break;
684 default : return "invalid"; break;
690 db_md_list_watchpoints()
695 fill_dbregs(NULL, &d);
697 db_printf("\nhardware watchpoints:\n");
698 db_printf(" watch status type len address\n");
699 db_printf(" ----- -------- ---------- --- ------------------\n");
700 for (i = 0; i < 4; i++) {
701 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
702 type = DBREG_DR7_ACCESS(d.dr[7], i);
703 len = DBREG_DR7_LEN(d.dr[7], i);
704 if (len == DBREG_DR7_LEN_8)
708 db_printf(" %-5d %-8s %10s %3d ",
709 i, "enabled", watchtype_str(type), len);
710 db_printsym((db_addr_t)DBREG_DRX((&d), i), DB_STGY_ANY);
713 db_printf(" %-5d disabled\n", i);
717 db_printf("\ndebug register values:\n");
718 for (i = 0; i < 8; i++) {
719 db_printf(" dr%d 0x%016lx\n", i, DBREG_DRX((&d), i));
725 amd64_db_resume_dbreg(void)
729 switch (PCPU_GET(dbreg_cmd)) {
730 case PC_DBREG_CMD_LOAD:
731 d = (struct dbreg *)PCPU_PTR(dbreg);
733 PCPU_SET(dbreg_cmd, PC_DBREG_CMD_NONE);