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
init_vectors(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
exception_handler(unsigned vector,struct cpu_state * st)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