Home | History | Annotate | Line # | Download | only in kdump
kdump.c revision 1.53 
      1 /*	$NetBSD: kdump.c,v 1.53 2003/07/11 13:06:11 wiz Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  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 the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)kdump.c	8.4 (Berkeley) 4/28/95";
     45 #else
     46 __RCSID("$NetBSD: kdump.c,v 1.53 2003/07/11 13:06:11 wiz Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/param.h>
     51 #define _KERNEL
     52 #include <sys/errno.h>
     53 #undef _KERNEL
     54 #include <sys/time.h>
     55 #include <sys/uio.h>
     56 #include <sys/ktrace.h>
     57 #include <sys/ioctl.h>
     58 #include <sys/ptrace.h>
     59 
     60 #include <ctype.h>
     61 #include <err.h>
     62 #include <signal.h>
     63 #include <stddef.h>
     64 #include <stdio.h>
     65 #include <stdlib.h>
     66 #include <string.h>
     67 #include <unistd.h>
     68 #include <vis.h>
     69 
     70 #include "ktrace.h"
     71 #include "setemul.h"
     72 
     73 #include <sys/syscall.h>
     74 
     75 int timestamp, decimal, plain, tail, maxdata = -1, numeric;
     76 int hexdump;
     77 pid_t do_pid = -1;
     78 const char *tracefile = NULL;
     79 struct ktr_header ktr_header;
     80 int emul_changed = 0;
     81 
     82 #define eqs(s1, s2)	(strcmp((s1), (s2)) == 0)
     83 
     84 static const char *ptrace_ops[] = {
     85 	"PT_TRACE_ME",	"PT_READ_I",	"PT_READ_D",	"PT_READ_U",
     86 	"PT_WRITE_I",	"PT_WRITE_D",	"PT_WRITE_U",	"PT_CONTINUE",
     87 	"PT_KILL",	"PT_ATTACH",	"PT_DETACH",
     88 };
     89 
     90 static const char *linux_ptrace_ops[] = {
     91 	"PTRACE_TRACEME",
     92 	"PTRACE_PEEKTEXT", "PTRACE_PEEKDATA", "PTRACE_PEEKUSER",
     93 	"PTRACE_POKETEXT", "PTRACE_POKEDATA", "PTRACE_POKEUSER",
     94 	"PTRACE_CONT", "PTRACE_KILL", "PTRACE_SINGLESTEP",
     95 	NULL, NULL,
     96 	"PTRACE_GETREGS", "PTRACE_SETREGS", "PTRACE_GETFPREGS",
     97 	"PTRACE_SETFPREGS", "PTRACE_ATTACH", "PTRACE_DETACH",
     98 	"PTRACE_SYSCALL",
     99 };
    100 
    101 int	main __P((int, char **));
    102 int	fread_tail __P((char *, int, int));
    103 void	dumpheader __P((struct ktr_header *));
    104 void	ioctldecode __P((u_long));
    105 void	ktrsyscall __P((struct ktr_syscall *));
    106 void	ktrsysret __P((struct ktr_sysret *, int));
    107 void	ktrnamei __P((char *, int));
    108 void	ktremul __P((char *, int, int));
    109 void	ktrgenio __P((struct ktr_genio *, int));
    110 void	ktrpsig __P((struct ktr_psig *));
    111 void	ktrcsw __P((struct ktr_csw *));
    112 void	ktruser __P((struct ktr_user *, int));
    113 void	ktrmmsg __P((struct ktr_mmsg *, int));
    114 void	usage __P((void));
    115 void	eprint __P((int));
    116 void	rprint __P((register_t));
    117 char	*ioctlname __P((long));
    118 static const char *signame __P((long, int));
    119 
    120 int
    121 main(argc, argv)
    122 	int argc;
    123 	char *argv[];
    124 {
    125 	int ch, ktrlen, size;
    126 	void *m;
    127 	int trpoints = ALL_POINTS;
    128 	const char *emul_name = "netbsd";
    129 
    130 	while ((ch = getopt(argc, argv, "e:f:dlm:Nnp:RTt:x")) != -1)
    131 		switch (ch) {
    132 		case 'e':
    133 			emul_name = strdup(optarg); /* it's safer to copy it */
    134 			break;
    135 		case 'f':
    136 			tracefile = optarg;
    137 			break;
    138 		case 'd':
    139 			decimal = 1;
    140 			break;
    141 		case 'l':
    142 			tail = 1;
    143 			break;
    144 		case 'p':
    145 			do_pid = atoi(optarg);
    146 			break;
    147 		case 'm':
    148 			maxdata = atoi(optarg);
    149 			break;
    150 		case 'N':
    151 			numeric++;
    152 			break;
    153 		case 'n':
    154 			plain++;
    155 			break;
    156 		case 'R':
    157 			timestamp = 2;	/* relative timestamp */
    158 			break;
    159 		case 'T':
    160 			timestamp = 1;
    161 			break;
    162 		case 't':
    163 			trpoints = getpoints(optarg);
    164 			if (trpoints < 0)
    165 				errx(1, "unknown trace point in %s", optarg);
    166 			break;
    167 		case 'x':
    168 			hexdump = 1;
    169 			break;
    170 		default:
    171 			usage();
    172 		}
    173 	argv += optind;
    174 	argc -= optind;
    175 
    176 	if (tracefile == NULL) {
    177 		if (argc == 1) {
    178 			tracefile = argv[0];
    179 			argv++;
    180 			argc--;
    181 		}
    182 		else
    183 			tracefile = DEF_TRACEFILE;
    184 	}
    185 
    186 	if (argc > 0)
    187 		usage();
    188 
    189 	setemul(emul_name, 0, 0);
    190 	mach_lookup_emul();
    191 
    192 	m = malloc(size = 1024);
    193 	if (m == NULL)
    194 		errx(1, "malloc: %s", strerror(ENOMEM));
    195 	if (!freopen(tracefile, "r", stdin))
    196 		err(1, "%s", tracefile);
    197 	while (fread_tail((char *)&ktr_header, sizeof(struct ktr_header), 1)) {
    198 		if (trpoints & (1<<ktr_header.ktr_type))
    199 			if (do_pid == -1 || ktr_header.ktr_pid == do_pid)
    200 				dumpheader(&ktr_header);
    201 		if ((ktrlen = ktr_header.ktr_len) < 0)
    202 			errx(1, "bogus length 0x%x", ktrlen);
    203 		if (ktrlen > size) {
    204 			while(ktrlen > size) size *= 2;
    205 			m = (void *)realloc(m, size);
    206 			if (m == NULL)
    207 				errx(1, "realloc: %s", strerror(ENOMEM));
    208 		}
    209 		if (ktrlen && fread_tail(m, ktrlen, 1) == 0)
    210 			errx(1, "data too short");
    211 		if ((trpoints & (1<<ktr_header.ktr_type)) == 0)
    212 			continue;
    213 
    214 		/* update context to match currently processed record */
    215 		if (do_pid != -1 && ktr_header.ktr_pid != do_pid)
    216 			continue;
    217 		ectx_sanify(ktr_header.ktr_pid);
    218 
    219 		switch (ktr_header.ktr_type) {
    220 		case KTR_SYSCALL:
    221 			ktrsyscall((struct ktr_syscall *)m);
    222 			break;
    223 		case KTR_SYSRET:
    224 			ktrsysret((struct ktr_sysret *)m, ktrlen);
    225 			break;
    226 		case KTR_NAMEI:
    227 			ktrnamei(m, ktrlen);
    228 			break;
    229 		case KTR_GENIO:
    230 			ktrgenio((struct ktr_genio *)m, ktrlen);
    231 			break;
    232 		case KTR_PSIG:
    233 			ktrpsig((struct ktr_psig *)m);
    234 			break;
    235 		case KTR_CSW:
    236 			ktrcsw((struct ktr_csw *)m);
    237 			break;
    238 		case KTR_EMUL:
    239 			ktremul(m, ktrlen, size);
    240 			break;
    241 		case KTR_USER:
    242 			ktruser((struct ktr_user *)m, ktrlen);
    243 			break;
    244 		case KTR_MMSG:
    245 			ktrmmsg((struct ktr_mmsg *)m, ktrlen);
    246 			break;
    247 		}
    248 		if (tail)
    249 			(void)fflush(stdout);
    250 	}
    251 	return (0);
    252 }
    253 
    254 int
    255 fread_tail(buf, size, num)
    256 	char *buf;
    257 	int num, size;
    258 {
    259 	int i;
    260 
    261 	while ((i = fread(buf, size, num, stdin)) == 0 && tail) {
    262 		(void)sleep(1);
    263 		clearerr(stdin);
    264 	}
    265 	return (i);
    266 }
    267 
    268 void
    269 dumpheader(kth)
    270 	struct ktr_header *kth;
    271 {
    272 	char unknown[64], *type;
    273 	static struct timeval prevtime;
    274 	struct timeval temp;
    275 
    276 	switch (kth->ktr_type) {
    277 	case KTR_SYSCALL:
    278 		type = "CALL";
    279 		break;
    280 	case KTR_SYSRET:
    281 		type = "RET ";
    282 		break;
    283 	case KTR_NAMEI:
    284 		type = "NAMI";
    285 		break;
    286 	case KTR_GENIO:
    287 		type = "GIO ";
    288 		break;
    289 	case KTR_PSIG:
    290 		type = "PSIG";
    291 		break;
    292 	case KTR_CSW:
    293 		type = "CSW";
    294 		break;
    295 	case KTR_EMUL:
    296 		type = "EMUL";
    297 		break;
    298 	case KTR_USER:
    299 		type = "USER";
    300 		break;
    301 	case KTR_MMSG:
    302 		type = "MMSG";
    303 		break;
    304 	default:
    305 		(void)sprintf(unknown, "UNKNOWN(%d)", kth->ktr_type);
    306 		type = unknown;
    307 	}
    308 
    309 	(void)printf("%6d %-8.*s ", kth->ktr_pid, MAXCOMLEN, kth->ktr_comm);
    310 	if (timestamp) {
    311 		if (timestamp == 2) {
    312 			timersub(&kth->ktr_time, &prevtime, &temp);
    313 			prevtime = kth->ktr_time;
    314 		} else
    315 			temp = kth->ktr_time;
    316 		(void)printf("%ld.%06ld ",
    317 		    (long int)temp.tv_sec, (long int)temp.tv_usec);
    318 	}
    319 	(void)printf("%s  ", type);
    320 }
    321 
    322 void
    323 ioctldecode(cmd)
    324 	u_long cmd;
    325 {
    326 	char dirbuf[4], *dir = dirbuf;
    327 
    328 	if (cmd & IOC_IN)
    329 		*dir++ = 'W';
    330 	if (cmd & IOC_OUT)
    331 		*dir++ = 'R';
    332 	*dir = '\0';
    333 
    334 	printf(decimal ? ",_IO%s('%c',%ld" : ",_IO%s('%c',%#lx",
    335 	    dirbuf, (int) ((cmd >> 8) & 0xff), cmd & 0xff);
    336 	if ((cmd & IOC_VOID) == 0)
    337 		printf(decimal ? ",%ld)" : ",%#lx)", (cmd >> 16) & 0xff);
    338 	else
    339 		printf(")");
    340 }
    341 
    342 void
    343 ktrsyscall(ktr)
    344 	struct ktr_syscall *ktr;
    345 {
    346 	int argsize = ktr->ktr_argsize;
    347 	const struct emulation *revelant = current;
    348 	register_t *ap;
    349 
    350 	if (((ktr->ktr_code >= revelant->nsysnames || ktr->ktr_code < 0)
    351 	    && (mach_traps_dispatch(&ktr->ktr_code, &revelant) == 0)) ||
    352 	    numeric)
    353 		(void)printf("[%d]", ktr->ktr_code);
    354 	else
    355 		(void)printf("%s", revelant->sysnames[ktr->ktr_code]);
    356 	ap = (register_t *)((char *)ktr + sizeof(struct ktr_syscall));
    357 	if (argsize) {
    358 		char c = '(';
    359 		if (!plain) {
    360 			char *cp;
    361 
    362 			switch (ktr->ktr_code) {
    363 			case SYS_ioctl:
    364 				if (decimal)
    365 					(void)printf("(%ld", (long)*ap);
    366 				else
    367 					(void)printf("(%#lx", (long)*ap);
    368 				ap++;
    369 				argsize -= sizeof(register_t);
    370 				if ((cp = ioctlname(*ap)) != NULL)
    371 					(void)printf(",%s", cp);
    372 				else
    373 					ioctldecode(*ap);
    374 				c = ',';
    375 				ap++;
    376 				argsize -= sizeof(register_t);
    377 				break;
    378 
    379 			case SYS_ptrace:
    380 				if (strcmp(revelant->name, "linux") == 0) {
    381 				  if (*ap >= 0 && *ap <=
    382 				      sizeof(linux_ptrace_ops) /
    383 				      sizeof(linux_ptrace_ops[0]))
    384 					(void)printf("(%s",
    385 					    linux_ptrace_ops[*ap]);
    386 				  else
    387 					(void)printf("(%ld", (long)*ap);
    388 				} else {
    389 				  if (*ap >= 0 && *ap <=
    390 				    sizeof(ptrace_ops) / sizeof(ptrace_ops[0]))
    391 					(void)printf("(%s", ptrace_ops[*ap]);
    392 				  else
    393 					(void)printf("(%ld", (long)*ap);
    394 				}
    395 				c = ',';
    396 				ap++;
    397 				argsize -= sizeof(register_t);
    398 				break;
    399 
    400 			case SYS_kill:
    401 				if (decimal)
    402 					(void)printf("(%ld, SIG%s",
    403 					    (long)ap[0], signame(ap[1], 1));
    404 				else
    405 					(void)printf("(%#lx, SIG%s",
    406 					    (long)ap[0], signame(ap[1], 1));
    407 				ap += 2;
    408 				argsize -= 2 * sizeof(register_t);
    409 				break;
    410 
    411 			default:
    412 				/* No special handling */
    413 				break;
    414 			}
    415 		}
    416 		while (argsize) {
    417 			if (decimal)
    418 				(void)printf("%c%ld", c, (long)*ap);
    419 			else
    420 				(void)printf("%c%#lx", c, (long)*ap);
    421 			c = ',';
    422 			ap++;
    423 			argsize -= sizeof(register_t);
    424 		}
    425 		(void)putchar(')');
    426 	}
    427 	(void)putchar('\n');
    428 }
    429 
    430 void
    431 ktrsysret(ktr, len)
    432 	struct ktr_sysret *ktr;
    433 	int len;
    434 {
    435 	const struct emulation *revelant;
    436 	int error = ktr->ktr_error;
    437 	int code = ktr->ktr_code;
    438 
    439 	if (emul_changed)
    440 		revelant = previous;
    441 	else
    442 		revelant = current;
    443 	emul_changed = 0;
    444 
    445 	if ((code >= revelant->nsysnames || code < 0 || plain > 1)
    446 	    && (mach_traps_dispatch(&code, &revelant) == 0))
    447 		(void)printf("[%d] ", code);
    448 	else
    449 		(void)printf("%s ", revelant->sysnames[code]);
    450 
    451 	switch (error) {
    452 	case 0:
    453 		rprint(ktr->ktr_retval);
    454 		if (len > offsetof(struct ktr_sysret, ktr_retval_1) &&
    455 		    ktr->ktr_retval_1 != 0) {
    456 			(void)printf(", ");
    457 			rprint(ktr->ktr_retval_1);
    458 		}
    459 		break;
    460 
    461 	default:
    462 		eprint(error);
    463 		break;
    464 	}
    465 	(void)putchar('\n');
    466 }
    467 
    468 void
    469 rprint(register_t ret)
    470 {
    471 	if (!plain) {
    472 		(void)printf("%ld", (long)ret);
    473 		if (ret < 0 || ret > 9)
    474 			(void)printf("/%#lx", (long)ret);
    475 	} else {
    476 		if (decimal)
    477 			(void)printf("%ld", (long)ret);
    478 		else
    479 			(void)printf("%#lx", (long)ret);
    480 	}
    481 }
    482 
    483 /*
    484  * We print the original emulation's error numerically, but we
    485  * translate it to netbsd to print it symbolically.
    486  */
    487 void
    488 eprint(e)
    489 	int e;
    490 {
    491 	int i = e;
    492 
    493 	if (current->errnomap) {
    494 
    495 		/* No remapping for ERESTART and EJUSTRETURN */
    496 		/* Kludge for linux that has negative error numbers */
    497 		if (current->errnomap[2] > 0 && e < 0)
    498 			goto normal;
    499 
    500 		for (i = 0; i < current->nerrnomap; i++)
    501 			if (e == current->errnomap[i])
    502 				break;
    503 
    504 		if (i == current->nerrnomap) {
    505 			printf("-1 unknown errno %d", e);
    506 			return;
    507 		}
    508 	}
    509 
    510 normal:
    511 	switch (i) {
    512 	case ERESTART:
    513 		(void)printf("RESTART");
    514 		break;
    515 
    516 	case EJUSTRETURN:
    517 		(void)printf("JUSTRETURN");
    518 		break;
    519 
    520 	default:
    521 		(void)printf("-1 errno %d", e);
    522 		if (!plain)
    523 			(void)printf(" %s", strerror(i));
    524 	}
    525 }
    526 
    527 void
    528 ktrnamei(cp, len)
    529 	char *cp;
    530 	int len;
    531 {
    532 
    533 	(void)printf("\"%.*s\"\n", len, cp);
    534 }
    535 
    536 void
    537 ktremul(name, len, bufsize)
    538 	char *name;
    539 	int len, bufsize;
    540 {
    541 	if (len >= bufsize)
    542 		len = bufsize - 1;
    543 
    544 	name[len] = '\0';
    545 	setemul(name, ktr_header.ktr_pid, 1);
    546 	emul_changed = 1;
    547 
    548 	(void)printf("\"%s\"\n", name);
    549 }
    550 
    551 static void
    552 hexdump_buf(void *vdp, int datalen)
    553 {
    554 	char chars[16];
    555 	unsigned char *dp = vdp;
    556 	int line_len, i, l, c;
    557 	char *cp;
    558 
    559 	for (; datalen > 0; datalen -= 16) {
    560 		line_len = 16;
    561 		printf("\t");
    562 		if (line_len > datalen)
    563 			line_len = datalen;
    564 		cp = chars;
    565 		l = 0;
    566 		for (i = 0; i < line_len; i++) {
    567 			c = *dp++;
    568 			if (i == 8)
    569 				l += printf(" ");
    570 			l += printf("%2.2x ", c);
    571 			*cp++ = isgraph(c) ? c : '.';
    572 		} while (--i);
    573 		printf("%*s %.*s\n", 50 - l, "", cp - chars, chars);
    574 	}
    575 }
    576 
    577 void
    578 ktrgenio(ktr, len)
    579 	struct ktr_genio *ktr;
    580 	int len;
    581 {
    582 	int datalen = len - sizeof (struct ktr_genio);
    583 	char *dp = (char *)ktr + sizeof (struct ktr_genio);
    584 	char *cp;
    585 	int col = 0;
    586 	int width;
    587 	char visbuf[5];
    588 	static int screenwidth = 0;
    589 
    590 	if (screenwidth == 0) {
    591 		struct winsize ws;
    592 
    593 		if (!plain && ioctl(fileno(stderr), TIOCGWINSZ, &ws) != -1 &&
    594 		    ws.ws_col > 8)
    595 			screenwidth = ws.ws_col;
    596 		else
    597 			screenwidth = 80;
    598 	}
    599 	printf("fd %d %s %d bytes\n", ktr->ktr_fd,
    600 		ktr->ktr_rw == UIO_READ ? "read" : "wrote", datalen);
    601 	if (maxdata == 0)
    602 		return;
    603 	if (maxdata > 0 && datalen > maxdata)
    604 		datalen = maxdata;
    605 	if (hexdump) {
    606 		hexdump_buf(dp, datalen);
    607 		return;
    608 	}
    609 	(void)printf("       \"");
    610 	col = 8;
    611 	for (; datalen > 0; datalen--, dp++) {
    612 		(void) vis(visbuf, *dp, VIS_CSTYLE, datalen>1?*(dp+1):0);
    613 		cp = visbuf;
    614 		/*
    615 		 * Keep track of printables and
    616 		 * space chars (like fold(1)).
    617 		 */
    618 		if (col == 0) {
    619 			(void)putchar('\t');
    620 			col = 8;
    621 		}
    622 		switch(*cp) {
    623 		case '\n':
    624 			col = 0;
    625 			(void)putchar('\n');
    626 			continue;
    627 		case '\t':
    628 			width = 8 - (col&07);
    629 			break;
    630 		default:
    631 			width = strlen(cp);
    632 		}
    633 		if (col + width > (screenwidth-2)) {
    634 			(void)printf("\\\n\t");
    635 			col = 8;
    636 		}
    637 		col += width;
    638 		do {
    639 			(void)putchar(*cp++);
    640 		} while (*cp);
    641 	}
    642 	if (col == 0)
    643 		(void)printf("       ");
    644 	(void)printf("\"\n");
    645 }
    646 
    647 void
    648 ktrpsig(psig)
    649 	struct ktr_psig *psig;
    650 {
    651 	int signo, first;
    652 
    653 	(void)printf("SIG%s ", signame(psig->signo, 0));
    654 	if (psig->action == SIG_DFL)
    655 		(void)printf("SIG_DFL\n");
    656 	else {
    657 		(void)printf("caught handler=0x%lx mask=(",
    658 		    (u_long)psig->action);
    659 		first = 1;
    660 		for (signo = 1; signo < NSIG; signo++) {
    661 			if (sigismember(&psig->mask, signo)) {
    662 				if (first)
    663 					first = 0;
    664 				else
    665 					(void)printf(",");
    666 				(void)printf("%d", signo);
    667 			}
    668 		}
    669 		(void)printf(") code=0x%x\n", psig->code);
    670 	}
    671 }
    672 
    673 void
    674 ktrcsw(cs)
    675 	struct ktr_csw *cs;
    676 {
    677 
    678 	(void)printf("%s %s\n", cs->out ? "stop" : "resume",
    679 	    cs->user ? "user" : "kernel");
    680 }
    681 
    682 void
    683 ktruser(usr, len)
    684 	struct ktr_user *usr;
    685 	int len;
    686 {
    687 	int i;
    688 	unsigned char *dta;
    689 
    690 	printf("\"%.*s: %d, ", KTR_USER_MAXIDLEN, usr->ktr_id, len);
    691 	dta = (unsigned char *)usr;
    692 	for(i=sizeof(struct ktr_user); i < len; i++)
    693 		printf("%02x", (unsigned int) dta[i]);
    694 	printf("\"\n");
    695 }
    696 
    697 void
    698 ktrmmsg(mmsg, len)
    699 	struct ktr_mmsg *mmsg;
    700 	int len;
    701 {
    702 	int i,j;
    703 	unsigned char *data;
    704 	int row_len = 16;
    705 	int aligned_len;
    706 
    707 	printf("id %d [0x%x -> 0x%x] %d bytes, flags 0x%x",
    708 	    mmsg->ktr_id, mmsg->ktr_local_port,
    709 	    mmsg->ktr_remote_port, mmsg->ktr_size, mmsg->ktr_bits);
    710 
    711 	data = (unsigned char *)mmsg;
    712 	aligned_len = (len & ~(row_len - 1)) + row_len;
    713 	for (i = 0; i < aligned_len; i += row_len) {
    714 		printf("\n\t0x%04x  ", i);
    715 
    716 		for (j = 0; j < row_len; j += sizeof(int))
    717 			if ((i + j) < len)
    718 				printf("0x%08x ", *((int *)&data[i + j]));
    719 			else
    720 				printf("           ");
    721 
    722 		printf("  ");
    723 
    724 		for (j = 0; j < row_len; j++) {
    725 			if ((i + j) < len) {
    726 				if (isprint(data[i + j]))
    727 					printf("%c", data[i + j]);
    728 				else
    729 					printf(".");
    730 			} else {
    731 				printf(" ");
    732 			}
    733 		}
    734 	}
    735 
    736 	if (aligned_len != sizeof(struct ktr_mmsg))
    737 		printf("\n");
    738 }
    739 
    740 static const char *
    741 signame(long sig, int xlat)
    742 {
    743 	static char buf[64];
    744 	if (sig == 0)
    745 		return " 0";
    746 	else if (sig < 0 || sig >= NSIG) {
    747 		(void)snprintf(buf, sizeof(buf), "*unknown %ld*", sig);
    748 		return buf;
    749 	} else
    750 		return sys_signame[(xlat && current->signalmap != NULL) ?
    751 		    current->signalmap[sig] : sig];
    752 }
    753 
    754 void
    755 usage()
    756 {
    757 
    758 	(void)fprintf(stderr, "usage: kdump [-dlNnRTx] [-e emulation] "
    759 	   "[-f file] [-m maxdata] [-p pid]\n             [-t trstr] "
    760 	   "[file]\n");
    761 	exit(1);
    762 }
    763