/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <sys/types.h>
#include <sys/msgbuf.h>
#include <sys/sysctl.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <locale.h>
#include <nlist.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>

void usage(void) __dead2;

int
main(int argc, char *argv[])
{
	kvm_t *kd;
	char *memf, *nlistf;
	uint8_t *bp;
	size_t addr, size;
	size_t i;
	int ch;

	(void) setlocale(LC_CTYPE, "");
	memf = nlistf = NULL;
	while ((ch = getopt(argc, argv, "M:N:")) != -1)
		switch(ch) {
		case 'M':
			memf = optarg;
			break;
		case 'N':
			nlistf = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;
	if (argc != 2)
		usage();
	printf("debug: args: %s %s\n", argv[0], argv[1]);
	addr = strtoul(argv[0], NULL, 0);
	size = strtoul(argv[1], NULL, 0);
	printf("debug: args: addr=%zx size=%zx\n", addr, size);
	bp = malloc(size);

	/* Read in kernel message buffer and do sanity checks. */
	kd = kvm_open(nlistf, memf, NULL, O_RDONLY, "vmcore_read");
	if (kd == NULL)
		exit (1);
	if (kvm_read(kd, (long)addr, bp, size) != (ssize_t)size)
		errx(1, "kvm_read: %s", kvm_geterr(kd));
	kvm_close(kd);
	for (i = 0; i < size; i++)
		printf("%02x ", bp[i]);
	printf("\n");
	exit(0);
}

void
usage(void)
{
	fprintf(stderr, "usage: vmcore_read -M core -N system addr size\n");
	exit(1);
}