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      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