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kdump.c revision 1.48 
      1 /*	$NetBSD: kdump.c,v 1.48 2003/05/15 12:57:54 dsl 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 1.48 2003/05/15 12:57:54 dsl 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 pid_t do_pid = -1;
     77 const char *tracefile = NULL;
     78 struct ktr_header ktr_header;
     79 int emul_changed = 0;
     80 
     81 #define eqs(s1, s2)	(strcmp((s1), (s2)) == 0)
     82 
     83 static const char *ptrace_ops[] = {
     84 	"PT_TRACE_ME",	"PT_READ_I",	"PT_READ_D",	"PT_READ_U",
     85 	"PT_WRITE_I",	"PT_WRITE_D",	"PT_WRITE_U",	"PT_CONTINUE",
     86 	"PT_KILL",	"PT_ATTACH",	"PT_DETACH",
     87 };
     88 
     89 static const char *linux_ptrace_ops[] = {
     90 	"PTRACE_TRACEME",
     91 	"PTRACE_PEEKTEXT", "PTRACE_PEEKDATA", "PTRACE_PEEKUSER",
     92 	"PTRACE_POKETEXT", "PTRACE_POKEDATA", "PTRACE_POKEUSER",
     93 	"PTRACE_CONT", "PTRACE_KILL", "PTRACE_SINGLESTEP",
     94 	NULL, NULL,
     95 	"PTRACE_GETREGS", "PTRACE_SETREGS", "PTRACE_GETFPREGS",
     96 	"PTRACE_SETFPREGS", "PTRACE_ATTACH", "PTRACE_DETACH",
     97 	"PTRACE_SYSCALL",
     98 };
     99 
    100 int	main __P((int, char **));
    101 int	fread_tail __P((char *, int, int));
    102 void	dumpheader __P((struct ktr_header *));
    103 void	ioctldecode __P((u_long));
    104 void	ktrsyscall __P((struct ktr_syscall *));
    105 void	ktrsysret __P((struct ktr_sysret *, int));
    106 void	ktrnamei __P((char *, int));
    107 void	ktremul __P((char *, int, int));
    108 void	ktrgenio __P((struct ktr_genio *, int));
    109 void	ktrpsig __P((struct ktr_psig *));
    110 void	ktrcsw __P((struct ktr_csw *));
    111 void	ktruser __P((struct ktr_user *, int));
    112 void	ktrmmsg __P((struct ktr_mmsg *, int));
    113 void	usage __P((void));
    114 void	eprint __P((int));
    115 void	rprint __P((register_t));
    116 char	*ioctlname __P((long));
    117 static const char *signame __P((long, int));
    118 
    119 int
    120 main(argc, argv)
    121 	int argc;
    122 	char *argv[];
    123 {
    124 	int ch, ktrlen, size;
    125 	void *m;
    126 	int trpoints = ALL_POINTS;
    127 	const char *emul_name = "netbsd";
    128 
    129 	while ((ch = getopt(argc, argv, "e:f:dlm:Nnp:RTt:")) != -1)
    130 		switch (ch) {
    131 		case 'e':
    132 			emul_name = strdup(optarg); /* it's safer to copy it */
    133 			break;
    134 		case 'f':
    135 			tracefile = optarg;
    136 			break;
    137 		case 'd':
    138 			decimal = 1;
    139 			break;
    140 		case 'l':
    141 			tail = 1;
    142 			break;
    143 		case 'p':
    144 			do_pid = atoi(optarg);
    145 			break;
    146 		case 'm':
    147 			maxdata = atoi(optarg);
    148 			break;
    149 		case 'N':
    150 			numeric++;
    151 			break;
    152 		case 'n':
    153 			plain++;
    154 			break;
    155 		case 'R':
    156 			timestamp = 2;	/* relative timestamp */
    157 			break;
    158 		case 'T':
    159 			timestamp = 1;
    160 			break;
    161 		case 't':
    162 			trpoints = getpoints(optarg);
    163 			if (trpoints < 0)
    164 				errx(1, "unknown trace point in %s", optarg);
    165 			break;
    166 		default:
    167 			usage();
    168 		}
    169 	argv += optind;
    170 	argc -= optind;
    171 
    172 	if (tracefile == NULL) {
    173 		if (argc == 1) {
    174 			tracefile = argv[0];
    175 			argv++;
    176 			argc--;
    177 		}
    178 		else
    179 			tracefile = DEF_TRACEFILE;
    180 	}
    181 
    182 	if (argc > 0)
    183 		usage();
    184 
    185 	setemul(emul_name, 0, 0);
    186 	mach_lookup_emul();
    187 
    188 	m = malloc(size = 1024);
    189 	if (m == NULL)
    190 		errx(1, "malloc: %s", strerror(ENOMEM));
    191 	if (!freopen(tracefile, "r", stdin))
    192 		err(1, "%s", tracefile);
    193 	while (fread_tail((char *)&ktr_header, sizeof(struct ktr_header), 1)) {
    194 		if (trpoints & (1<<ktr_header.ktr_type))
    195 			if (do_pid == -1 || ktr_header.ktr_pid == do_pid)
    196 				dumpheader(&ktr_header);
    197 		if ((ktrlen = ktr_header.ktr_len) < 0)
    198 			errx(1, "bogus length 0x%x", ktrlen);
    199 		if (ktrlen > size) {
    200 			while(ktrlen > size) size *= 2;
    201 			m = (void *)realloc(m, size);
    202 			if (m == NULL)
    203 				errx(1, "realloc: %s", strerror(ENOMEM));
    204 		}
    205 		if (ktrlen && fread_tail(m, ktrlen, 1) == 0)
    206 			errx(1, "data too short");
    207 		if ((trpoints & (1<<ktr_header.ktr_type)) == 0)
    208 			continue;
    209 
    210 		/* update context to match currently processed record */
    211 		if (do_pid != -1 && ktr_header.ktr_pid != do_pid)
    212 			continue;
    213 		ectx_sanify(ktr_header.ktr_pid);
    214 
    215 		switch (ktr_header.ktr_type) {
    216 		case KTR_SYSCALL:
    217 			ktrsyscall((struct ktr_syscall *)m);
    218 			break;
    219 		case KTR_SYSRET:
    220 			ktrsysret((struct ktr_sysret *)m, ktrlen);
    221 			break;
    222 		case KTR_NAMEI:
    223 			ktrnamei(m, ktrlen);
    224 			break;
    225 		case KTR_GENIO:
    226 			ktrgenio((struct ktr_genio *)m, ktrlen);
    227 			break;
    228 		case KTR_PSIG:
    229 			ktrpsig((struct ktr_psig *)m);
    230 			break;
    231 		case KTR_CSW:
    232 			ktrcsw((struct ktr_csw *)m);
    233 			break;
    234 		case KTR_EMUL:
    235 			ktremul(m, ktrlen, size);
    236 			break;
    237 		case KTR_USER:
    238 			ktruser((struct ktr_user *)m, ktrlen);
    239 			break;
    240 		case KTR_MMSG:
    241 			ktrmmsg((struct ktr_mmsg *)m, ktrlen);
    242 			break;
    243 		}
    244 		if (tail)
    245 			(void)fflush(stdout);
    246 	}
    247 	return (0);
    248 }
    249 
    250 int
    251 fread_tail(buf, size, num)
    252 	char *buf;
    253 	int num, size;
    254 {
    255 	int i;
    256 
    257 	while ((i = fread(buf, size, num, stdin)) == 0 && tail) {
    258 		(void)sleep(1);
    259 		clearerr(stdin);
    260 	}
    261 	return (i);
    262 }
    263 
    264 void
    265 dumpheader(kth)
    266 	struct ktr_header *kth;
    267 {
    268 	char unknown[64], *type;
    269 	static struct timeval prevtime;
    270 	struct timeval temp;
    271 
    272 	switch (kth->ktr_type) {
    273 	case KTR_SYSCALL:
    274 		type = "CALL";
    275 		break;
    276 	case KTR_SYSRET:
    277 		type = "RET ";
    278 		break;
    279 	case KTR_NAMEI:
    280 		type = "NAMI";
    281 		break;
    282 	case KTR_GENIO:
    283 		type = "GIO ";
    284 		break;
    285 	case KTR_PSIG:
    286 		type = "PSIG";
    287 		break;
    288 	case KTR_CSW:
    289 		type = "CSW";
    290 		break;
    291 	case KTR_EMUL:
    292 		type = "EMUL";
    293 		break;
    294 	case KTR_USER:
    295 		type = "USER";
    296 		break;
    297 	case KTR_MMSG:
    298 		type = "MMSG";
    299 		break;
    300 	default:
    301 		(void)sprintf(unknown, "UNKNOWN(%d)", kth->ktr_type);
    302 		type = unknown;
    303 	}
    304 
    305 	(void)printf("%6d %-8.*s ", kth->ktr_pid, MAXCOMLEN, kth->ktr_comm);
    306 	if (timestamp) {
    307 		if (timestamp == 2) {
    308 			timersub(&kth->ktr_time, &prevtime, &temp);
    309 			prevtime = kth->ktr_time;
    310 		} else
    311 			temp = kth->ktr_time;
    312 		(void)printf("%ld.%06ld ",
    313 		    (long int)temp.tv_sec, (long int)temp.tv_usec);
    314 	}
    315 	(void)printf("%s  ", type);
    316 }
    317 
    318 void
    319 ioctldecode(cmd)
    320 	u_long cmd;
    321 {
    322 	char dirbuf[4], *dir = dirbuf;
    323 
    324 	if (cmd & IOC_IN)
    325 		*dir++ = 'W';
    326 	if (cmd & IOC_OUT)
    327 		*dir++ = 'R';
    328 	*dir = '\0';
    329 
    330 	printf(decimal ? ",_IO%s('%c',%ld" : ",_IO%s('%c',%#lx",
    331 	    dirbuf, (int) ((cmd >> 8) & 0xff), cmd & 0xff);
    332 	if ((cmd & IOC_VOID) == 0)
    333 		printf(decimal ? ",%ld)" : ",%#lx)", (cmd >> 16) & 0xff);
    334 	else
    335 		printf(")");
    336 }
    337 
    338 void
    339 ktrsyscall(ktr)
    340 	struct ktr_syscall *ktr;
    341 {
    342 	int argsize = ktr->ktr_argsize;
    343 	const struct emulation *revelant = current;
    344 	register_t *ap;
    345 
    346 	if (((ktr->ktr_code >= revelant->nsysnames || ktr->ktr_code < 0)
    347 	    && (mach_traps_dispatch(&ktr->ktr_code, &revelant) == 0)) ||
    348 	    numeric)
    349 		(void)printf("[%d]", ktr->ktr_code);
    350 	else
    351 		(void)printf("%s", revelant->sysnames[ktr->ktr_code]);
    352 	ap = (register_t *)((char *)ktr + sizeof(struct ktr_syscall));
    353 	if (argsize) {
    354 		char c = '(';
    355 		if (!plain) {
    356 			char *cp;
    357 
    358 			switch (ktr->ktr_code) {
    359 			case SYS_ioctl:
    360 				if (decimal)
    361 					(void)printf("(%ld", (long)*ap);
    362 				else
    363 					(void)printf("(%#lx", (long)*ap);
    364 				ap++;
    365 				argsize -= sizeof(register_t);
    366 				if ((cp = ioctlname(*ap)) != NULL)
    367 					(void)printf(",%s", cp);
    368 				else
    369 					ioctldecode(*ap);
    370 				c = ',';
    371 				ap++;
    372 				argsize -= sizeof(register_t);
    373 				break;
    374 
    375 			case SYS_ptrace:
    376 				if (strcmp(revelant->name, "linux") == 0) {
    377 				  if (*ap >= 0 && *ap <=
    378 				      sizeof(linux_ptrace_ops) /
    379 				      sizeof(linux_ptrace_ops[0]))
    380 					(void)printf("(%s",
    381 					    linux_ptrace_ops[*ap]);
    382 				  else
    383 					(void)printf("(%ld", (long)*ap);
    384 				} else {
    385 				  if (*ap >= 0 && *ap <=
    386 				    sizeof(ptrace_ops) / sizeof(ptrace_ops[0]))
    387 					(void)printf("(%s", ptrace_ops[*ap]);
    388 				  else
    389 					(void)printf("(%ld", (long)*ap);
    390 				}
    391 				c = ',';
    392 				ap++;
    393 				argsize -= sizeof(register_t);
    394 				break;
    395 
    396 			case SYS_kill:
    397 				if (decimal)
    398 					(void)printf("(%ld, SIG%s",
    399 					    (long)ap[0], signame(ap[1], 1));
    400 				else
    401 					(void)printf("(%#lx, SIG%s",
    402 					    (long)ap[0], signame(ap[1], 1));
    403 				ap += 2;
    404 				argsize -= 2 * sizeof(register_t);
    405 				break;
    406 
    407 			default:
    408 				/* No special handling */
    409 				break;
    410 			}
    411 		}
    412 		while (argsize) {
    413 			if (decimal)
    414 				(void)printf("%c%ld", c, (long)*ap);
    415 			else
    416 				(void)printf("%c%#lx", c, (long)*ap);
    417 			c = ',';
    418 			ap++;
    419 			argsize -= sizeof(register_t);
    420 		}
    421 		(void)putchar(')');
    422 	}
    423 	(void)putchar('\n');
    424 }
    425 
    426 void
    427 ktrsysret(ktr, len)
    428 	struct ktr_sysret *ktr;
    429 	int len;
    430 {
    431 	const struct emulation *revelant;
    432 	int error = ktr->ktr_error;
    433 	int code = ktr->ktr_code;
    434 
    435 	if (emul_changed)
    436 		revelant = previous;
    437 	else
    438 		revelant = current;
    439 	emul_changed = 0;
    440 
    441 	if ((code >= revelant->nsysnames || code < 0 || plain > 1)
    442 	    && (mach_traps_dispatch(&code, &revelant) == 0))
    443 		(void)printf("[%d] ", code);
    444 	else
    445 		(void)printf("%s ", revelant->sysnames[code]);
    446 
    447 	switch (error) {
    448 	case 0:
    449 		rprint(ktr->ktr_retval);
    450 		if (len > offsetof(struct ktr_sysret, ktr_retval_1) &&
    451 		    ktr->ktr_retval_1 != 0) {
    452 			(void)printf(", ");
    453 			rprint(ktr->ktr_retval_1);
    454 		}
    455 		break;
    456 
    457 	default:
    458 		eprint(error);
    459 		break;
    460 	}
    461 	(void)putchar('\n');
    462 }
    463 
    464 void
    465 rprint(register_t ret)
    466 {
    467 	if (!plain) {
    468 		(void)printf("%ld", (long)ret);
    469 		if (ret < 0 || ret > 9)
    470 			(void)printf("/%#lx", (long)ret);
    471 	} else {
    472 		if (decimal)
    473 			(void)printf("%ld", (long)ret);
    474 		else
    475 			(void)printf("%#lx", (long)ret);
    476 	}
    477 }
    478 
    479 /*
    480  * We print the original emulation's error numerically, but we
    481  * translate it to netbsd to print it symbolically.
    482  */
    483 void
    484 eprint(e)
    485 	int e;
    486 {
    487 	int i = e;
    488 
    489 	if (current->errnomap) {
    490 
    491 		/* No remapping for ERESTART and EJUSTRETURN */
    492 		/* Kludge for linux that has negative error numbers */
    493 		if (current->errnomap[2] > 0 && e < 0)
    494 			goto normal;
    495 
    496 		for (i = 0; i < current->nerrnomap; i++)
    497 			if (e == current->errnomap[i])
    498 				break;
    499 
    500 		if (i == current->nerrnomap) {
    501 			printf("-1 unknown errno %d", e);
    502 			return;
    503 		}
    504 	}
    505 
    506 normal:
    507 	switch (i) {
    508 	case ERESTART:
    509 		(void)printf("RESTART");
    510 		break;
    511 
    512 	case EJUSTRETURN:
    513 		(void)printf("JUSTRETURN");
    514 		break;
    515 
    516 	default:
    517 		(void)printf("-1 errno %d", e);
    518 		if (!plain)
    519 			(void)printf(" %s", strerror(i));
    520 	}
    521 }
    522 
    523 void
    524 ktrnamei(cp, len)
    525 	char *cp;
    526 	int len;
    527 {
    528 
    529 	(void)printf("\"%.*s\"\n", len, cp);
    530 }
    531 
    532 void
    533 ktremul(name, len, bufsize)
    534 	char *name;
    535 	int len, bufsize;
    536 {
    537 	if (len >= bufsize)
    538 		len = bufsize - 1;
    539 
    540 	name[len] = '\0';
    541 	setemul(name, ktr_header.ktr_pid, 1);
    542 	emul_changed = 1;
    543 
    544 	(void)printf("\"%s\"\n", name);
    545 }
    546 
    547 void
    548 ktrgenio(ktr, len)
    549 	struct ktr_genio *ktr;
    550 	int len;
    551 {
    552 	int datalen = len - sizeof (struct ktr_genio);
    553 	char *dp = (char *)ktr + sizeof (struct ktr_genio);
    554 	char *cp;
    555 	int col = 0;
    556 	int width;
    557 	char visbuf[5];
    558 	static int screenwidth = 0;
    559 
    560 	if (screenwidth == 0) {
    561 		struct winsize ws;
    562 
    563 		if (!plain && ioctl(fileno(stderr), TIOCGWINSZ, &ws) != -1 &&
    564 		    ws.ws_col > 8)
    565 			screenwidth = ws.ws_col;
    566 		else
    567 			screenwidth = 80;
    568 	}
    569 	printf("fd %d %s %d bytes\n", ktr->ktr_fd,
    570 		ktr->ktr_rw == UIO_READ ? "read" : "wrote", datalen);
    571 	if (maxdata == 0)
    572 		return;
    573 	if (maxdata > 0 && datalen > maxdata)
    574 		datalen = maxdata;
    575 	(void)printf("       \"");
    576 	col = 8;
    577 	for (; datalen > 0; datalen--, dp++) {
    578 		(void) vis(visbuf, *dp, VIS_CSTYLE, datalen>1?*(dp+1):0);
    579 		cp = visbuf;
    580 		/*
    581 		 * Keep track of printables and
    582 		 * space chars (like fold(1)).
    583 		 */
    584 		if (col == 0) {
    585 			(void)putchar('\t');
    586 			col = 8;
    587 		}
    588 		switch(*cp) {
    589 		case '\n':
    590 			col = 0;
    591 			(void)putchar('\n');
    592 			continue;
    593 		case '\t':
    594 			width = 8 - (col&07);
    595 			break;
    596 		default:
    597 			width = strlen(cp);
    598 		}
    599 		if (col + width > (screenwidth-2)) {
    600 			(void)printf("\\\n\t");
    601 			col = 8;
    602 		}
    603 		col += width;
    604 		do {
    605 			(void)putchar(*cp++);
    606 		} while (*cp);
    607 	}
    608 	if (col == 0)
    609 		(void)printf("       ");
    610 	(void)printf("\"\n");
    611 }
    612 
    613 void
    614 ktrpsig(psig)
    615 	struct ktr_psig *psig;
    616 {
    617 	int signo, first;
    618 
    619 	(void)printf("SIG%s ", signame(psig->signo, 0));
    620 	if (psig->action == SIG_DFL)
    621 		(void)printf("SIG_DFL\n");
    622 	else {
    623 		(void)printf("caught handler=0x%lx mask=(",
    624 		    (u_long)psig->action);
    625 		first = 1;
    626 		for (signo = 1; signo < NSIG; signo++) {
    627 			if (sigismember(&psig->mask, signo)) {
    628 				if (first)
    629 					first = 0;
    630 				else
    631 					(void)printf(",");
    632 				(void)printf("%d", signo);
    633 			}
    634 		}
    635 		(void)printf(") code=0x%x\n", psig->code);
    636 	}
    637 }
    638 
    639 void
    640 ktrcsw(cs)
    641 	struct ktr_csw *cs;
    642 {
    643 
    644 	(void)printf("%s %s\n", cs->out ? "stop" : "resume",
    645 	    cs->user ? "user" : "kernel");
    646 }
    647 
    648 void
    649 ktruser(usr, len)
    650 	struct ktr_user *usr;
    651 	int len;
    652 {
    653 	int i;
    654 	unsigned char *dta;
    655 
    656 	printf("\"%.*s: %d, ", KTR_USER_MAXIDLEN, usr->ktr_id, len);
    657 	dta = (unsigned char *)usr;
    658 	for(i=sizeof(struct ktr_user); i < len; i++)
    659 		printf("%02x", (unsigned int) dta[i]);
    660 	printf("\"\n");
    661 }
    662 
    663 void
    664 ktrmmsg(mmsg, len)
    665 	struct ktr_mmsg *mmsg;
    666 	int len;
    667 {
    668 	int i,j;
    669 	unsigned char *data;
    670 	int row_len = 16;
    671 	int aligned_len;
    672 
    673 	printf("id %d [0x%x -> 0x%x] %d bytes, flags 0x%x",
    674 	    mmsg->ktr_id, mmsg->ktr_local_port,
    675 	    mmsg->ktr_remote_port, mmsg->ktr_size, mmsg->ktr_bits);
    676 
    677 	data = (unsigned char *)mmsg;
    678 	aligned_len = (len & ~(row_len - 1)) + row_len;
    679 	for (i = 0; i < aligned_len; i += row_len) {
    680 		printf("\n\t0x%04x  ", i);
    681 
    682 		for (j = 0; j < row_len; j += sizeof(int))
    683 			if ((i + j) < len)
    684 				printf("0x%08x ", *((int *)&data[i + j]));
    685 			else
    686 				printf("           ");
    687 
    688 		printf("  ");
    689 
    690 		for (j = 0; j < row_len; j++) {
    691 			if ((i + j) < len) {
    692 				if (isprint(data[i + j]))
    693 					printf("%c", data[i + j]);
    694 				else
    695 					printf(".");
    696 			} else {
    697 				printf(" ");
    698 			}
    699 		}
    700 	}
    701 
    702 	if (aligned_len != sizeof(struct ktr_mmsg))
    703 		printf("\n");
    704 }
    705 
    706 static const char *
    707 signame(long sig, int xlat)
    708 {
    709 	static char buf[64];
    710 	if (sig == 0)
    711 		return " 0";
    712 	else if (sig < 0 || sig >= NSIG) {
    713 		(void)snprintf(buf, sizeof(buf), "*unknown %ld*", sig);
    714 		return buf;
    715 	} else
    716 		return sys_signame[(xlat && current->signalmap != NULL) ?
    717 		    current->signalmap[sig] : sig];
    718 }
    719 
    720 void
    721 usage()
    722 {
    723 
    724 	(void)fprintf(stderr, "usage: kdump [-dlNnRT] [-e emulation] "
    725 	   "[-f file] [-m maxdata] [-p pid]\n             [-t trstr] "
    726 	   "[file]\n");
    727 	exit(1);
    728 }
    729