1 /* $NetBSD: exception.c,v 1.1 2011/10/30 20:42:09 phx Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Frank Wille. 5 * All rights reserved. 6 * 7 * Written by Frank Wille for The NetBSD Project. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 33 #include <lib/libsa/stand.h> 34 #include <lib/libsa/loadfile.h> 35 #include <lib/libkern/libkern.h> 36 37 #include "globals.h" 38 39 #ifdef DEBUG 40 struct cpu_state { 41 uint32_t gpr[32]; 42 uint32_t cr, xer, lr, ctr; 43 uint32_t srr0, srr1, dar, dsisr; 44 uint32_t dmiss, dcmp, hash1, hash2; 45 uint32_t imiss, icmp, rpa; 46 }; 47 48 void init_vectors(void); /* called from early startup */ 49 void exception_handler(unsigned, struct cpu_state *); 50 51 52 void 53 init_vectors(void) 54 { 55 extern uint8_t trap[], trap_end[]; 56 uint8_t *exc; 57 uint32_t *ip; 58 59 /* install exception handlers */ 60 for (exc = (uint8_t *)0x100; exc <= (uint8_t *)0x1400; exc += 0x100) 61 memcpy(exc, trap, trap_end - trap); 62 63 /* handle NULL-ptr calls from 0x0 to 0xfc */ 64 for (ip = 0; ip < (uint32_t *)0x100; ip++) 65 *ip = 0x48000002 | (uint32_t)trap; 66 67 __syncicache(0, 0x1400); 68 } 69 70 void 71 exception_handler(unsigned vector, struct cpu_state *st) 72 { 73 static bool in_exception = false; 74 uint32_t *fp; 75 int i; 76 77 if (vector > 0x1400) 78 printf("\nCALL TO NULL POINTER FROM %08x\n", st->lr - 4); 79 else 80 printf("\nEXCEPTION VECTOR %04x\n", vector); 81 if (in_exception) { 82 printf("caused in exception handler! Restarting...\n"); 83 _rtt(); 84 } 85 in_exception = true; 86 87 /* register dump */ 88 printf("\n SRR0=%08x SRR1=%08x DAR=%08x DSISR=%08x\n" 89 " CR=%08x XER=%08x LR=%08x CTR=%08x\n" 90 "DMISS=%08x DCMP=%08x HASH1=%08x HASH2=%08x\n" 91 "IMISS=%08x ICMP=%08x RPA=%08x\n\n", 92 st->srr0, st->srr1, st->dar, st->dsisr, 93 st->cr, st->xer, st->lr, st->ctr, 94 st->dmiss,st->dcmp,st->hash1,st->hash2, 95 st->imiss,st->icmp,st->rpa); 96 for (i = 0; i < 32; i++) { 97 if ((i & 7) == 0) 98 printf("GPR%02d:", i); 99 printf("%c%08x", (i & 7) == 4 ? ':' : ' ', st->gpr[i]); 100 if ((i & 7) == 7) 101 printf("\n"); 102 } 103 104 /* V.4-ABI stack frame back trace */ 105 printf("\nBacktrace:\n"); 106 i = 0; 107 fp = (uint32_t *)st->gpr[1]; 108 while ((fp = *(uint32_t **)fp) != NULL && i++ < 10) 109 printf("%p: called from %08x\n", fp, *(fp + 1) - 4); 110 111 printf("\nHit any key to reboot.\n"); 112 (void)getchar(); 113 _rtt(); 114 } 115 116 #endif /* DEBUG */ 117