1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * Intel-specific portions of the debugger fault routines
31 */
32
33 #include <sys/types.h>
34 #include <sys/stack.h>
35 #include <sys/frame.h>
36
37 #include <kmdb/kmdb_fault.h>
38 #include <kmdb/kmdb_asmutil.h>
39 #include <mdb/mdb_kreg.h>
40 #include <mdb/mdb.h>
41
42 #define MAX_STACK_FRAMES 30
43
44 static void
print_frame(uintptr_t pc,int fnum,int safe)45 print_frame(uintptr_t pc, int fnum, int safe)
46 {
47 if (safe) {
48 /*
49 * We exploded the first time around, so we want to try again,
50 * this time without symbol names
51 */
52 mdb_iob_printf(mdb.m_err, " [%2d] %?p()\n", fnum, pc);
53 } else {
54 mdb_iob_printf(mdb.m_err, " [%2d] %?p %A()\n", fnum, pc, pc);
55 }
56 }
57
58 static int
valid_frame(struct frame * fr)59 valid_frame(struct frame *fr)
60 {
61 uintptr_t addr = (uintptr_t)fr;
62
63 if (addr & (STACK_ALIGN - 1)) {
64 mdb_iob_printf(mdb.m_err, " mis-aligned frame (%p)\n", fr);
65 return (0);
66 }
67
68 return (1);
69 }
70
71 static void
print_stack(kreg_t sp,int safe)72 print_stack(kreg_t sp, int safe)
73 {
74 struct frame *fr = (struct frame *)sp;
75 int frnum = 1;
76
77 while (fr != NULL && valid_frame(fr) && fr->fr_savpc != 0 &&
78 frnum < MAX_STACK_FRAMES) {
79 print_frame(fr->fr_savpc, frnum, safe);
80
81 fr = (struct frame *)fr->fr_savfp;
82 frnum++;
83 }
84 }
85
86 void
kmdb_print_stack(void)87 kmdb_print_stack(void)
88 {
89 print_stack(get_fp(), FALSE); /* show sym names */
90 }
91
92 void
kmdb_fault_display(kreg_t trapno,kreg_t pc,kreg_t sp,int safe)93 kmdb_fault_display(kreg_t trapno, kreg_t pc, kreg_t sp, int safe)
94 {
95 mdb_iob_printf(mdb.m_err, " trapno: %d, sp: %p, pc: %p", trapno,
96 sp, pc);
97 if (!safe)
98 mdb_iob_printf(mdb.m_err, " %A", pc);
99 mdb_iob_printf(mdb.m_err, "\n\n");
100
101 if (mdb.m_dseg == NULL || mdb.m_dsegsz == 0) {
102 mdb_iob_printf(mdb.m_err,
103 "\t*** Stack trace omitted because debugger segment size\n"
104 "\t*** and/or length not set.\n");
105 return;
106 }
107
108 if (!(sp - (uintptr_t)mdb.m_dseg < mdb.m_dsegsz)) {
109 mdb_iob_printf(mdb.m_err,
110 "\t*** Stack trace omitted because sp (%p) isn't in the\n"
111 "\t*** debugger segment.\n", sp);
112 return;
113 }
114
115 /*
116 * We were on a kmdb stack when we took this fault. We're going to
117 * assume that there's nothing weird on the stack, and that, therefore,
118 * we can use a simple algorithm to dump it.
119 */
120
121 print_stack(sp, safe);
122 }
123