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 } 116