1 /* $OpenBSD: debug.c,v 1.13 2004/03/09 19:12:12 tom Exp $ */
2
3 /*
4 * Copyright (c) 1997 Michael Shalayeff
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <lib/libsa/stand.h>
31 #include <debug.h>
32 #include <dev/cons.h>
33
34 #define VBASE (0xb8000)
35
36 char *const reg_names[] = { REG_NAMES };
37 const int nreg = NENTS(reg_names);
38 struct reg reg;
39 u_int32_t *const reg_values[] = { REG_VALUES(reg) };
40 char *const trap_names[] = { TRAP_NAMES };
41
42 void d_putc(dev_t, int);
43
44 #ifdef DEBUG_DEBUG
45 #define CKPT(c) (*(u_short volatile *)(VBASE+160) = (0x1700 | (c)))
46 #else
47 #define CKPT(c) /* c */
48 #endif
49
50 void
51 debug_init(void)
52 {
53 }
54
55
56 void
57 dump_regs(u_int trapno, u_int arg)
58 {
59 register int i;
60 /* make it local, so it won't rely on .data/.bss corruption */
61 struct consdev d_cons, *save_cons;
62
63 /* init cons mod */
64 save_cons = cn_tab;
65 bzero(&d_cons, sizeof(d_cons));
66 d_cons.cn_putc = &d_putc;
67 cn_tab = &d_cons;
68
69 /* Trap info */
70 printf("\ftrap: %u(%x): %s\ncn_tab=%p\n",
71 trapno, arg, trap_names[trapno], save_cons);
72
73 /* Register dump */
74 for (i = 1; i <= nreg; i++)
75 printf("%s\t%x%c", reg_names[i-1], *reg_values[i-1],
76 ((i%4)? ' ': '\n'));
77
78 dump_mem("Code dump", (void *)*reg_values[8], 8);
79 /* %ebx (void *)((*reg_values[3] + 15) & ~0x0F) */
80 dump_mem("Memory dump", (void *)0x1a000, 48);
81 dump_mem("Stack trace", (void *)(*reg_values[4]), 48);
82
83 /* restore the console */
84 cn_tab = save_cons;
85 }
86
87 void
88 dump_mem(char *l, void *p, size_t n)
89 {
90 register int i;
91
92 printf("%s [%p]:%s", l, p, (n > 6? "\n":" "));
93 for (i = 1; i <= n; i++)
94 printf("%x%c", *(u_int32_t *)p++, ((i%8)? ' ': '\n'));
95 if (n % 8)
96 printf("\n");
97 }
98
99
100 u_int d_pos;
101
102 void
103 d_putc(dev_t d, int c)
104 {
105 switch (c) {
106 case '\n': d_pos += 80; break;
107 case '\r': d_pos -= d_pos % 80; break;
108 case '\b': d_pos--; break;
109 case '\f': bzero((void *)VBASE, 80*25*2); d_pos = 0; break;
110 /* print it */
111 default:
112 ((u_int16_t volatile *)VBASE)[d_pos++] = 0x0700 | (u_char)c;
113 break;
114 }
115 }