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machdep.c revision 1.8 
      1 /*	$NetBSD: machdep.c,v 1.8 2023/02/04 14:38:09 tsutsui Exp $	*/
      2 /*
      3  * Copyright (c) 1998 Darrin Jewell
      4  * Copyright (c) 1994 Rolf Grossmann
      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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Rolf Grossmann.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/types.h>
     34 
     35 #include <stand.h>
     36 #include <next68k/next68k/nextrom.h>
     37 
     38 char *mg;
     39 
     40 #define	MON(type, off) (*(type *)((u_int) (mg) + off))
     41 
     42 extern int entry_point;
     43 
     44 #ifdef DEBUG
     45 int debug = 1;
     46 #else
     47 int debug = 0;
     48 #endif
     49 
     50 #ifdef DEBUG
     51 #define DPRINTF(x) printf x
     52 #else
     53 #define DPRINTF(x)
     54 #endif
     55 
     56 void
     57 machdep_start(char *entry, int howto, char *loadaddr, char *ssym, char *esym)
     58 {
     59 	DPRINTF(("machdep_start(entry=%p,howto=0x%x,loadaddr=%p,ssym=%p,esym=%p\n",
     60 		 entry, howto, loadaddr, ssym, esym));
     61 	MON(int,MG_boot_how) = howto;
     62 	entry_point = (int)entry + (int)loadaddr;
     63 	DPRINTF(("start=0x%lx\n", (u_long)entry_point));
     64 
     65 	/* @@@ hack to pass esym to kernel */
     66 	*((u_int *)loadaddr) = (u_int)esym;
     67 
     68 	/* return to exec, so that main can return entry point */
     69 }
     70 
     71 typedef int (*getcptr)(void);
     72 typedef int (*putcptr)(int);
     73 
     74 int
     75 getchar(void)
     76 {
     77 	return(MON(getcptr,MG_getc)());
     78 }
     79 
     80 void
     81 putchar(int c)
     82 {
     83 	MON(putcptr,MG_putc)(c);
     84 }
     85 
     86 __dead void
     87 _rtt(void)
     88 {
     89 	extern __dead void _halt(void);
     90 
     91 	printf("Press any key to halt.\n");
     92 	getchar();
     93 	_halt();
     94 	/* NOTREACHED */
     95 }
     96 
     97 struct trapframe {
     98 	int dregs[8];
     99 	int aregs[8];
    100 	short sr;
    101 	int pc;
    102 	u_short fmt:4,
    103 		vec:12;
    104 	char info[0];
    105 } __attribute__ ((packed));
    106 
    107 int trap(struct trapframe *);
    108 
    109 int
    110 trap(struct trapframe *fp)
    111 {
    112 	static int intrap = 0;
    113 
    114 	if (intrap)
    115 		return 0;
    116 	intrap = 1;
    117 	printf("Got unexpected trap: format=%x vector=%x sr=%x pc=%x\n",
    118 	       fp->fmt, fp->vec, fp->sr, fp->pc);
    119 	printf("dregs: %x %x %x %x %x %x %x %x\n",
    120 	       fp->dregs[0], fp->dregs[1], fp->dregs[2], fp->dregs[3],
    121 	       fp->dregs[4], fp->dregs[5], fp->dregs[6], fp->dregs[7]);
    122 	printf("aregs: %x %x %x %x %x %x %x %x\n",
    123 	       fp->aregs[0], fp->aregs[1], fp->aregs[2], fp->aregs[3],
    124 	       fp->aregs[4], fp->aregs[5], fp->aregs[6], fp->aregs[7]);
    125 	intrap = 0;
    126 #ifdef DEBUG
    127 	if (debug)
    128 	{
    129 		int i;
    130 		int *p;
    131 		p = (int *)(fp->pc);
    132 		for (i = 0; i < 64; i++) {
    133 			if ((i % 8) == 0)
    134 				printf ("\npc %x: ", (int)&p[i-16]);
    135 			printf ("%x ", p[i]);
    136 		}
    137 		p = (int *)(fp->info);
    138 		for (i = 0; i < 64; i++) {
    139 			if ((i % 8) == 0)
    140 				printf ("\nstk %x: ", (int)&p[i-16]);
    141 			printf ("%x ", p[i]);
    142 		}
    143 		printf ("\n");
    144 	}
    145 #endif
    146 	printf("Halting.\n");
    147 	return 0;
    148 }
    149