2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
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18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/subr_prf.c,v 1.61.2.5 2002/08/31 18:22:08 dwmalone Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/msgbuf.h>
44 #include <sys/malloc.h>
48 #include <sys/tprintf.h>
49 #include <sys/stdint.h>
50 #include <sys/syslog.h>
53 #include <sys/sysctl.h>
55 #include <sys/ctype.h>
56 #include <sys/eventhandler.h>
57 #include <sys/kthread.h>
58 #include <sys/cpu_topology.h>
60 #include <sys/thread2.h>
61 #include <sys/spinlock2.h>
68 * Note that stdarg.h and the ANSI style va_start macro is used for both
69 * ANSI and traditional C compilers. We use the __ machine version to stay
70 * within the kernel header file set.
72 #include <machine/stdarg.h>
78 #define TONOSPIN 0x10 /* avoid serialization */
80 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
81 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
96 struct tty *constty; /* pointer to console "window" tty */
98 static void msglogchar(int c, int pri);
99 static void msgaddchar(int c, void *dummy);
100 static void kputchar (int ch, void *arg);
101 static char *ksprintn (char *nbuf, uintmax_t num, int base, int *lenp,
103 static void snprintf_func (int ch, void *arg);
105 static int consintr = 1; /* Ok to handle console interrupts? */
106 static int msgbufmapped; /* Set when safe to use msgbuf */
107 static struct spinlock cons_spin = SPINLOCK_INITIALIZER(cons_spin, "cons_spin");
108 static thread_t constty_td = NULL;
112 static int log_console_output = 1;
113 TUNABLE_INT("kern.log_console_output", &log_console_output);
114 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
115 &log_console_output, 0, "");
116 static int kprintf_logging = TOLOG | TOCONS;
117 SYSCTL_INT(_kern, OID_AUTO, kprintf_logging, CTLFLAG_RW,
118 &kprintf_logging, 0, "");
120 static int unprivileged_read_msgbuf = 1;
121 SYSCTL_INT(_security, OID_AUTO, unprivileged_read_msgbuf, CTLFLAG_RW,
122 &unprivileged_read_msgbuf, 0,
123 "Unprivileged processes may read the kernel message buffer");
126 * Warn that a system table is full.
129 tablefull(const char *tab)
132 log(LOG_ERR, "%s: table is full\n", tab);
136 * Uprintf prints to the controlling terminal for the current process.
139 uprintf(const char *fmt, ...)
141 struct proc *p = curproc;
143 struct putchar_arg pca;
146 if (p && (p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) {
148 pca.tty = p->p_session->s_ttyp;
151 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
158 tprintf_open(struct proc *p)
160 if ((p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) {
161 sess_hold(p->p_session);
162 return ((tpr_t) p->p_session);
168 tprintf_close(tpr_t sess)
171 sess_rele((struct session *) sess);
175 * tprintf prints on the controlling terminal associated
176 * with the given session.
179 tprintf(tpr_t tpr, const char *fmt, ...)
181 struct session *sess = (struct session *)tpr;
182 struct tty *tp = NULL;
185 struct putchar_arg pca;
188 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
196 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
203 * Ttyprintf displays a message on a tty; it should be used only by
204 * the tty driver, or anything that knows the underlying tty will not
205 * be revoke(2)'d away. Other callers should use tprintf.
208 ttyprintf(struct tty *tp, const char *fmt, ...)
211 struct putchar_arg pca;
217 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
223 * Log writes to the log buffer, and guarantees not to sleep (so can be
224 * called by interrupt routines). If there is no process reading the
225 * log yet, it writes to the console also.
228 log(int level, const char *fmt, ...)
232 struct putchar_arg pca;
236 if ((kprintf_logging & TOCONS) == 0 || log_open)
242 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
249 #define CONSCHUNK 128
252 log_console(struct uio *uio)
254 int c, i, error, iovlen, nl;
256 struct iovec *miov = NULL;
260 if (!log_console_output)
263 pri = LOG_INFO | LOG_CONSOLE;
265 iovlen = uio->uio_iovcnt * sizeof (struct iovec);
266 miov = kmalloc(iovlen, M_TEMP, M_WAITOK);
267 consbuffer = kmalloc(CONSCHUNK, M_TEMP, M_WAITOK);
268 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen);
273 while (uio->uio_resid > 0) {
274 c = (int)szmin(uio->uio_resid, CONSCHUNK);
275 error = uiomove(consbuffer, (size_t)c, uio);
278 for (i = 0; i < c; i++) {
279 msglogchar(consbuffer[i], pri);
280 if (consbuffer[i] == '\n')
287 msglogchar('\n', pri);
290 kfree(consbuffer, M_TEMP);
295 * Output to the console.
298 kprintf(const char *fmt, ...)
302 struct putchar_arg pca;
305 savintr = consintr; /* disable interrupts */
309 pca.flags = kprintf_logging & ~TOTTY;
311 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
315 consintr = savintr; /* reenable interrupts */
320 kvprintf(const char *fmt, __va_list ap)
323 struct putchar_arg pca;
326 savintr = consintr; /* disable interrupts */
329 pca.flags = kprintf_logging & ~TOTTY;
331 retval = kvcprintf(fmt, kputchar, &pca, 10, ap);
334 consintr = savintr; /* reenable interrupts */
339 * Limited rate kprintf. The passed rate structure must be initialized
340 * with the desired reporting frequency. A frequency of 0 will result in
343 * count may be initialized to a negative number to allow an initial
347 krateprintf(struct krate *rate, const char *fmt, ...)
351 if (rate->ticks != (int)time_uptime) {
352 rate->ticks = (int)time_uptime;
356 if (rate->count < rate->freq) {
365 * Print a character to the dmesg log, the console, and/or the user's
368 * NOTE: TOTTY does not require nonblocking operation, but TOCONS
369 * and TOLOG do. When we have a constty we still output to
370 * the real console but we have a monitoring thread which
371 * we wakeup which tracks the log.
374 kputchar(int c, void *arg)
376 struct putchar_arg *ap = (struct putchar_arg*) arg;
377 int flags = ap->flags;
378 struct tty *tp = ap->tty;
382 if ((flags & TOCONS) && tp == NULL && constty)
383 flags |= TOLOG | TOWAKEUP;
384 if ((flags & TOTTY) && tputchar(c, tp) < 0)
387 msglogchar(c, ap->pri);
388 if ((flags & TOCONS) && c)
390 if (flags & TOWAKEUP)
395 * Scaled down version of sprintf(3).
398 ksprintf(char *buf, const char *cfmt, ...)
403 __va_start(ap, cfmt);
404 retval = kvcprintf(cfmt, NULL, buf, 10, ap);
411 * Scaled down version of vsprintf(3).
414 kvsprintf(char *buf, const char *cfmt, __va_list ap)
418 retval = kvcprintf(cfmt, NULL, buf, 10, ap);
424 * Scaled down version of snprintf(3).
427 ksnprintf(char *str, size_t size, const char *format, ...)
432 __va_start(ap, format);
433 retval = kvsnprintf(str, size, format, ap);
439 * Scaled down version of vsnprintf(3).
442 kvsnprintf(char *str, size_t size, const char *format, __va_list ap)
444 struct snprintf_arg info;
449 retval = kvcprintf(format, snprintf_func, &info, 10, ap);
450 if (info.remain >= 1)
456 ksnrprintf(char *str, size_t size, int radix, const char *format, ...)
461 __va_start(ap, format);
462 retval = kvsnrprintf(str, size, radix, format, ap);
468 kvsnrprintf(char *str, size_t size, int radix, const char *format, __va_list ap)
470 struct snprintf_arg info;
475 retval = kvcprintf(format, snprintf_func, &info, radix, ap);
476 if (info.remain >= 1)
482 kvasnrprintf(char **strp, size_t size, int radix,
483 const char *format, __va_list ap)
485 struct snprintf_arg info;
488 *strp = kmalloc(size, M_TEMP, M_WAITOK);
491 retval = kvcprintf(format, snprintf_func, &info, radix, ap);
492 if (info.remain >= 1)
498 kvasfree(char **strp)
501 kfree(*strp, M_TEMP);
507 snprintf_func(int ch, void *arg)
509 struct snprintf_arg *const info = arg;
511 if (info->remain >= 2) {
518 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
519 * order; return an optional length and a pointer to the last character
520 * written in the buffer (i.e., the first character of the string).
521 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
524 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
531 c = hex2ascii(num % base);
532 *++p = upper ? toupper(c) : c;
533 } while (num /= base);
540 * Scaled down version of printf(3).
542 * Two additional formats:
544 * The format %b is supported to decode error registers.
547 * kprintf("reg=%b\n", regval, "<base><arg>*");
549 * where <base> is the output base expressed as a control character, e.g.
550 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
551 * the first of which gives the bit number to be inspected (origin 1), and
552 * the next characters (up to a control character, i.e. a character <= 32),
553 * give the name of the register. Thus:
555 * kvcprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
557 * would produce output:
559 * reg=3<BITTWO,BITONE>
562 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;}
565 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg,
566 int radix, __va_list ap)
570 const char *p, *percent, *q;
573 int base, tmp, width, ladjust, sharpflag, spaceflag, neg, sign, dot;
574 int cflag, hflag, jflag, lflag, qflag, tflag, zflag;
577 int retval = 0, stop = 0;
581 * Make a supreme effort to avoid reentrant panics or deadlocks.
583 * NOTE! Do nothing that would access mycpu/gd/fs unless the
584 * function is the normal kputchar(), which allows us to
585 * use this function for very early debugging with a special
588 if (func == kputchar) {
589 if (mycpu->gd_flags & GDF_KPRINTF)
591 atomic_set_long(&mycpu->gd_flags, GDF_KPRINTF);
601 fmt = "(fmt null)\n";
603 if (radix < 2 || radix > 36)
606 usespin = (func == kputchar &&
607 (kprintf_logging & TONOSPIN) == 0 &&
608 panic_cpu_gd != mycpu &&
609 (((struct putchar_arg *)arg)->flags & TOTTY) == 0);
612 spin_lock(&cons_spin);
618 while ((ch = (u_char)*fmt++) != '%' || stop) {
624 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0;
626 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0;
629 switch (ch = (u_char)*fmt++) {
650 width = __va_arg(ap, int);
656 dwidth = __va_arg(ap, int);
664 case '1': case '2': case '3': case '4':
665 case '5': case '6': case '7': case '8': case '9':
666 for (n = 0;; ++fmt) {
667 n = n * 10 + ch - '0';
669 if (ch < '0' || ch > '9')
678 num = (u_int)__va_arg(ap, int);
679 p = __va_arg(ap, char *);
680 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
688 if (num & (1 << (n - 1))) {
689 PCHAR(tmp ? ',' : '<');
690 for (; (n = *p) > ' '; ++p)
694 for (; *p > ' '; ++p)
701 PCHAR(__va_arg(ap, int));
727 *(__va_arg(ap, char *)) = retval;
729 *(__va_arg(ap, short *)) = retval;
731 *(__va_arg(ap, intmax_t *)) = retval;
733 *(__va_arg(ap, long *)) = retval;
735 *(__va_arg(ap, quad_t *)) = retval;
737 *(__va_arg(ap, int *)) = retval;
744 sharpflag = (width == 0);
746 num = (uintptr_t)__va_arg(ap, void *);
757 p = __va_arg(ap, char *);
763 for (n = 0; n < dwidth && p[n]; n++)
768 if (!ladjust && width > 0)
773 if (ladjust && width > 0)
795 num = (u_char)__va_arg(ap, int);
797 num = (u_short)__va_arg(ap, int);
799 num = __va_arg(ap, uintmax_t);
801 num = __va_arg(ap, u_long);
803 num = __va_arg(ap, u_quad_t);
805 num = __va_arg(ap, ptrdiff_t);
807 num = __va_arg(ap, size_t);
809 num = __va_arg(ap, u_int);
813 num = (char)__va_arg(ap, int);
815 num = (short)__va_arg(ap, int);
817 num = __va_arg(ap, intmax_t);
819 num = __va_arg(ap, long);
821 num = __va_arg(ap, quad_t);
823 num = __va_arg(ap, ptrdiff_t);
825 num = __va_arg(ap, ssize_t);
827 num = __va_arg(ap, int);
829 if (sign && (intmax_t)num < 0) {
831 num = -(intmax_t)num;
833 p = ksprintn(nbuf, num, base, &n, upper);
835 if (sharpflag && num != 0) {
841 if (neg || (sign && spaceflag))
844 if (!ladjust && padc == '0')
845 dwidth = width - tmp;
846 width -= tmp + imax(dwidth, n);
853 } else if (sign && spaceflag) {
856 if (sharpflag && num != 0) {
859 } else if (base == 16) {
876 while (percent < fmt)
879 * Since we ignore an formatting argument it is no
880 * longer safe to obey the remaining formatting
881 * arguments as the arguments will no longer match
890 * Cleanup reentrancy issues.
892 if (func == kputchar)
893 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF);
895 spin_unlock(&cons_spin);
904 * Called from the panic code to try to get the console working
905 * again in case we paniced inside a kprintf().
910 spin_init(&cons_spin, "kvcre");
911 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF);
915 * Console support thread for constty intercepts. This is needed because
916 * console tty intercepts can block. Instead of having kputchar() attempt
917 * to directly write to the console intercept we just force it to log
918 * and wakeup this baby to track and dump the log to constty.
929 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc,
930 constty_td, SHUTDOWN_PRI_FIRST);
931 constty_td->td_flags |= TDF_SYSTHREAD;
934 rindex = mbp->msg_bufr; /* persistent loop variable */
935 xindex = mbp->msg_bufx - 1; /* anything different than bufx */
939 kproc_suspend_loop();
944 if (xindex == mbp->msg_bufx ||
947 tsleep(constty_td, 0, "waiting", hz*60);
954 * Get message buf FIFO indices. rindex is tracking.
956 xindex = mbp->msg_bufx;
958 if ((tp = constty) == NULL) {
964 * Check if the calculated bytes has rolled the whole
968 if (n > mbp->msg_size - 1024) {
969 rindex = xindex - mbp->msg_size + 2048;
974 * And dump it. If constty gets stuck will give up.
976 while (rindex != xindex) {
977 u_int ri = rindex % mbp->msg_size;
978 if (tputchar((uint8_t)mbp->msg_ptr[ri], tp) < 0) {
983 if (tp->t_outq.c_cc >= tp->t_ohiwat) {
984 tsleep(constty_daemon, 0, "blocked", hz / 10);
985 if (tp->t_outq.c_cc >= tp->t_ohiwat) {
995 static struct kproc_desc constty_kp = {
1000 SYSINIT(bufdaemon, SI_SUB_KTHREAD_UPDATE, SI_ORDER_ANY,
1001 kproc_start, &constty_kp);
1004 * Put character in log buffer with a particular priority.
1009 msglogchar(int c, int pri)
1011 static int lastpri = -1;
1012 static int dangling;
1018 if (c == '\0' || c == '\r')
1020 if (pri != -1 && pri != lastpri) {
1022 msgaddchar('\n', NULL);
1025 msgaddchar('<', NULL);
1026 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
1027 msgaddchar(*p--, NULL);
1028 msgaddchar('>', NULL);
1031 msgaddchar(c, NULL);
1041 * Put char in log buffer. Make sure nothing blows up beyond repair if
1042 * we have an MP race.
1047 msgaddchar(int c, void *dummy)
1058 lindex = mbp->msg_bufl;
1059 rindex = mbp->msg_bufr;
1060 xindex = mbp->msg_bufx++; /* Allow SMP race */
1063 mbp->msg_ptr[xindex % mbp->msg_size] = c;
1064 n = xindex - lindex;
1065 if (n > mbp->msg_size - 1024) {
1066 lindex = xindex - mbp->msg_size + 2048;
1068 mbp->msg_bufl = lindex;
1070 n = xindex - rindex;
1071 if (n > mbp->msg_size - 1024) {
1072 rindex = xindex - mbp->msg_size + 2048;
1074 mbp->msg_bufr = rindex;
1079 msgbufcopy(struct msgbuf *oldp)
1085 rindex = oldp->msg_bufr;
1086 xindex = oldp->msg_bufx;
1089 n = xindex - rindex;
1090 if (n > oldp->msg_size - 1024)
1091 rindex = xindex - oldp->msg_size + 2048;
1092 while (rindex != xindex) {
1093 msglogchar(oldp->msg_ptr[rindex % oldp->msg_size], -1);
1099 msgbufinit(void *ptr, size_t size)
1102 static struct msgbuf *oldp = NULL;
1104 size -= sizeof(*msgbufp);
1106 msgbufp = (struct msgbuf *) (cp + size);
1107 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size) {
1109 bzero(msgbufp, sizeof(*msgbufp));
1110 msgbufp->msg_magic = MSG_MAGIC;
1111 msgbufp->msg_size = (char *)msgbufp - cp;
1113 msgbufp->msg_ptr = cp;
1114 if (msgbufmapped && oldp != msgbufp)
1121 /* Sysctls for accessing/clearing the msgbuf */
1124 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1129 u_int rindex_modulo;
1130 u_int xindex_modulo;
1136 * Only wheel or root can access the message log.
1138 if (unprivileged_read_msgbuf == 0) {
1139 KKASSERT(req->td->td_proc);
1140 cred = req->td->td_proc->p_ucred;
1142 if ((cred->cr_prison || groupmember(0, cred) == 0) &&
1143 priv_check(req->td, PRIV_ROOT) != 0
1150 * Unwind the buffer, so that it's linear (possibly starting with
1151 * some initial nulls).
1153 * We don't push the entire buffer like we did before because
1154 * bufr (and bufl) now advance in chunks when the fifo is full,
1155 * rather than one character.
1158 rindex = mbp->msg_bufr;
1159 xindex = mbp->msg_bufx;
1160 n = xindex - rindex;
1161 if (n > mbp->msg_size - 1024) {
1162 rindex = xindex - mbp->msg_size + 2048;
1163 n = xindex - rindex;
1165 rindex_modulo = rindex % mbp->msg_size;
1166 xindex_modulo = xindex % mbp->msg_size;
1168 if (rindex_modulo < xindex_modulo) {
1170 * Can handle in one linear section.
1172 error = sysctl_handle_opaque(oidp,
1173 mbp->msg_ptr + rindex_modulo,
1174 xindex_modulo - rindex_modulo,
1176 } else if (rindex_modulo == xindex_modulo) {
1178 * Empty buffer, just return a single newline
1180 error = sysctl_handle_opaque(oidp, "\n", 1, req);
1181 } else if (n <= mbp->msg_size - rindex_modulo) {
1183 * Can handle in one linear section.
1185 error = sysctl_handle_opaque(oidp,
1186 mbp->msg_ptr + rindex_modulo,
1191 * Glue together two linear sections into one contiguous
1194 error = sysctl_handle_opaque(oidp,
1195 mbp->msg_ptr + rindex_modulo,
1196 mbp->msg_size - rindex_modulo,
1198 n -= mbp->msg_size - rindex_modulo;
1200 error = sysctl_handle_opaque(oidp, mbp->msg_ptr,
1208 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
1209 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1211 static int msgbuf_clear;
1214 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1217 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1218 if (!error && req->newptr) {
1219 /* Clear the buffer and reset write pointer */
1220 msgbufp->msg_bufr = msgbufp->msg_bufx;
1221 msgbufp->msg_bufl = msgbufp->msg_bufx;
1222 bzero(msgbufp->msg_ptr, msgbufp->msg_size);
1228 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1229 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0,
1230 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
1234 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1240 if (!msgbufmapped) {
1241 db_printf("msgbuf not mapped yet\n");
1244 db_printf("msgbufp = %p\n", msgbufp);
1245 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n",
1246 msgbufp->msg_magic, msgbufp->msg_size,
1247 msgbufp->msg_bufr % msgbufp->msg_size,
1248 msgbufp->msg_bufx % msgbufp->msg_size,
1251 rindex = msgbufp->msg_bufr;
1252 for (i = 0; i < msgbufp->msg_size; i++) {
1253 j = (i + rindex) % msgbufp->msg_size;
1254 db_printf("%c", msgbufp->msg_ptr[j]);
1263 hexdump(const void *ptr, int length, const char *hdr, int flags)
1267 const unsigned char *cp;
1270 if ((flags & HD_DELIM_MASK) != 0)
1271 delim = (flags & HD_DELIM_MASK) >> 8;
1275 if ((flags & HD_COLUMN_MASK) != 0)
1276 cols = flags & HD_COLUMN_MASK;
1281 for (i = 0; i < length; i+= cols) {
1285 if ((flags & HD_OMIT_COUNT) == 0)
1286 kprintf("%04x ", i);
1288 if ((flags & HD_OMIT_HEX) == 0) {
1289 for (j = 0; j < cols; j++) {
1292 kprintf("%c%02x", delim, cp[k]);
1298 if ((flags & HD_OMIT_CHARS) == 0) {
1300 for (j = 0; j < cols; j++) {
1304 else if (cp[k] >= ' ' && cp[k] <= '~')
1305 kprintf("%c", cp[k]);
1316 kprint_cpuset(cpumask_t *mask)
1324 CPUSET_FOREACH(i, *mask) {
1339 kprintf("%d-%d", b, e - 1);
1351 kprintf("%d-%d", b, e - 1);