1 /*- 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 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. 21 * 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 32 * SUCH DAMAGE. 33 * 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 $ 36 */ 37 38 #include "opt_ddb.h" 39 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> 45 #include <sys/proc.h> 46 #include <sys/priv.h> 47 #include <sys/tty.h> 48 #include <sys/tprintf.h> 49 #include <sys/stdint.h> 50 #include <sys/syslog.h> 51 #include <sys/cons.h> 52 #include <sys/uio.h> 53 #include <sys/sysctl.h> 54 #include <sys/lock.h> 55 #include <sys/ctype.h> 56 #include <sys/eventhandler.h> 57 #include <sys/kthread.h> 58 #include <sys/cpu_topology.h> 59 60 #include <sys/thread2.h> 61 #include <sys/spinlock2.h> 62 63 #ifdef DDB 64 #include <ddb/ddb.h> 65 #endif 66 67 /* 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. 71 */ 72 #include <machine/stdarg.h> 73 74 #define TOCONS 0x01 75 #define TOTTY 0x02 76 #define TOLOG 0x04 77 #define TOWAKEUP 0x08 78 #define TONOSPIN 0x10 /* avoid serialization */ 79 80 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 81 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 82 83 struct putchar_arg { 84 int flags; 85 int pri; 86 struct tty *tty; 87 }; 88 89 struct snprintf_arg { 90 char *str; 91 size_t remain; 92 }; 93 94 extern int log_open; 95 96 struct tty *constty; /* pointer to console "window" tty */ 97 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, 102 int upper); 103 static void snprintf_func (int ch, void *arg); 104 105 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; 109 110 int msgbuftrigger; 111 112 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, ""); 119 120 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"); 124 125 /* 126 * Warn that a system table is full. 127 */ 128 void 129 tablefull(const char *tab) 130 { 131 132 log(LOG_ERR, "%s: table is full\n", tab); 133 } 134 135 /* 136 * Uprintf prints to the controlling terminal for the current process. 137 */ 138 int 139 uprintf(const char *fmt, ...) 140 { 141 struct proc *p = curproc; 142 __va_list ap; 143 struct putchar_arg pca; 144 int retval = 0; 145 146 if (p && (p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 147 __va_start(ap, fmt); 148 pca.tty = p->p_session->s_ttyp; 149 pca.flags = TOTTY; 150 151 retval = kvcprintf(fmt, kputchar, &pca, ap); 152 __va_end(ap); 153 } 154 return (retval); 155 } 156 157 tpr_t 158 tprintf_open(struct proc *p) 159 { 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); 163 } 164 return (NULL); 165 } 166 167 void 168 tprintf_close(tpr_t sess) 169 { 170 if (sess) 171 sess_rele((struct session *) sess); 172 } 173 174 /* 175 * tprintf prints on the controlling terminal associated 176 * with the given session. 177 */ 178 int 179 tprintf(tpr_t tpr, const char *fmt, ...) 180 { 181 struct session *sess = (struct session *)tpr; 182 struct tty *tp = NULL; 183 int flags = TOLOG; 184 __va_list ap; 185 struct putchar_arg pca; 186 int retval; 187 188 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 189 flags |= TOTTY; 190 tp = sess->s_ttyp; 191 } 192 __va_start(ap, fmt); 193 pca.tty = tp; 194 pca.flags = flags; 195 pca.pri = LOG_INFO; 196 retval = kvcprintf(fmt, kputchar, &pca, ap); 197 __va_end(ap); 198 msgbuftrigger = 1; 199 return (retval); 200 } 201 202 /* 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. 206 */ 207 int 208 ttyprintf(struct tty *tp, const char *fmt, ...) 209 { 210 __va_list ap; 211 struct putchar_arg pca; 212 int retval; 213 214 __va_start(ap, fmt); 215 pca.tty = tp; 216 pca.flags = TOTTY; 217 retval = kvcprintf(fmt, kputchar, &pca, ap); 218 __va_end(ap); 219 return (retval); 220 } 221 222 /* 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. 226 */ 227 int 228 log(int level, const char *fmt, ...) 229 { 230 __va_list ap; 231 int retval; 232 struct putchar_arg pca; 233 234 pca.tty = NULL; 235 pca.pri = level; 236 if ((kprintf_logging & TOCONS) == 0 || log_open) 237 pca.flags = TOLOG; 238 else 239 pca.flags = TOCONS; 240 241 __va_start(ap, fmt); 242 retval = kvcprintf(fmt, kputchar, &pca, ap); 243 __va_end(ap); 244 245 msgbuftrigger = 1; 246 return (retval); 247 } 248 249 #define CONSCHUNK 128 250 251 void 252 log_console(struct uio *uio) 253 { 254 int c, i, error, iovlen, nl; 255 struct uio muio; 256 struct iovec *miov = NULL; 257 char *consbuffer; 258 int pri; 259 260 if (!log_console_output) 261 return; 262 263 pri = LOG_INFO | LOG_CONSOLE; 264 muio = *uio; 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); 269 muio.uio_iov = miov; 270 uio = &muio; 271 272 nl = 0; 273 while (uio->uio_resid > 0) { 274 c = (int)szmin(uio->uio_resid, CONSCHUNK); 275 error = uiomove(consbuffer, (size_t)c, uio); 276 if (error != 0) 277 break; 278 for (i = 0; i < c; i++) { 279 msglogchar(consbuffer[i], pri); 280 if (consbuffer[i] == '\n') 281 nl = 1; 282 else 283 nl = 0; 284 } 285 } 286 if (!nl) 287 msglogchar('\n', pri); 288 msgbuftrigger = 1; 289 kfree(miov, M_TEMP); 290 kfree(consbuffer, M_TEMP); 291 return; 292 } 293 294 /* 295 * Output to the console. 296 */ 297 int 298 kprintf(const char *fmt, ...) 299 { 300 __va_list ap; 301 int savintr; 302 struct putchar_arg pca; 303 int retval; 304 305 savintr = consintr; /* disable interrupts */ 306 consintr = 0; 307 __va_start(ap, fmt); 308 pca.tty = NULL; 309 pca.flags = kprintf_logging & ~TOTTY; 310 pca.pri = -1; 311 retval = kvcprintf(fmt, kputchar, &pca, ap); 312 __va_end(ap); 313 if (!panicstr) 314 msgbuftrigger = 1; 315 consintr = savintr; /* reenable interrupts */ 316 return (retval); 317 } 318 319 int 320 kvprintf(const char *fmt, __va_list ap) 321 { 322 int savintr; 323 struct putchar_arg pca; 324 int retval; 325 326 savintr = consintr; /* disable interrupts */ 327 consintr = 0; 328 pca.tty = NULL; 329 pca.flags = kprintf_logging & ~TOTTY; 330 pca.pri = -1; 331 retval = kvcprintf(fmt, kputchar, &pca, ap); 332 if (!panicstr) 333 msgbuftrigger = 1; 334 consintr = savintr; /* reenable interrupts */ 335 return (retval); 336 } 337 338 /* 339 * Limited rate kprintf. The passed rate structure must be initialized 340 * with the desired reporting frequency. A frequency of 0 will result in 341 * no output. 342 * 343 * count may be initialized to a negative number to allow an initial 344 * burst. 345 */ 346 void 347 krateprintf(struct krate *rate, const char *fmt, ...) 348 { 349 __va_list ap; 350 351 if (rate->ticks != (int)time_uptime) { 352 rate->ticks = (int)time_uptime; 353 if (rate->count > 0) 354 rate->count = 0; 355 } 356 if (rate->count < rate->freq) { 357 ++rate->count; 358 __va_start(ap, fmt); 359 kvprintf(fmt, ap); 360 __va_end(ap); 361 } 362 } 363 364 /* 365 * Print a character to the dmesg log, the console, and/or the user's 366 * terminal. 367 * 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. 372 */ 373 static void 374 kputchar(int c, void *arg) 375 { 376 struct putchar_arg *ap = (struct putchar_arg*) arg; 377 int flags = ap->flags; 378 struct tty *tp = ap->tty; 379 380 if (panicstr) 381 constty = NULL; 382 if ((flags & TOCONS) && tp == NULL && constty) 383 flags |= TOLOG | TOWAKEUP; 384 if ((flags & TOTTY) && tputchar(c, tp) < 0) 385 ap->flags &= ~TOTTY; 386 if ((flags & TOLOG)) 387 msglogchar(c, ap->pri); 388 if ((flags & TOCONS) && c) 389 cnputc(c); 390 if (flags & TOWAKEUP) 391 wakeup(constty_td); 392 } 393 394 /* 395 * Scaled down version of sprintf(3). 396 */ 397 int 398 ksprintf(char *buf, const char *cfmt, ...) 399 { 400 int retval; 401 __va_list ap; 402 403 __va_start(ap, cfmt); 404 retval = kvcprintf(cfmt, NULL, buf, ap); 405 buf[retval] = '\0'; 406 __va_end(ap); 407 return (retval); 408 } 409 410 /* 411 * Scaled down version of vsprintf(3). 412 */ 413 int 414 kvsprintf(char *buf, const char *cfmt, __va_list ap) 415 { 416 int retval; 417 418 retval = kvcprintf(cfmt, NULL, buf, ap); 419 buf[retval] = '\0'; 420 return (retval); 421 } 422 423 /* 424 * Scaled down version of snprintf(3). 425 */ 426 int 427 ksnprintf(char *str, size_t size, const char *format, ...) 428 { 429 int retval; 430 __va_list ap; 431 432 __va_start(ap, format); 433 retval = kvsnprintf(str, size, format, ap); 434 __va_end(ap); 435 return(retval); 436 } 437 438 /* 439 * Scaled down version of vsnprintf(3). 440 */ 441 int 442 kvsnprintf(char *str, size_t size, const char *format, __va_list ap) 443 { 444 struct snprintf_arg info; 445 int retval; 446 447 info.str = str; 448 info.remain = size; 449 retval = kvcprintf(format, snprintf_func, &info, ap); 450 if (info.remain >= 1) 451 *info.str++ = '\0'; 452 return (retval); 453 } 454 455 int 456 kvasnprintf(char **strp, size_t size, const char *format, __va_list ap) 457 { 458 struct snprintf_arg info; 459 int retval; 460 461 *strp = kmalloc(size, M_TEMP, M_WAITOK); 462 info.str = *strp; 463 info.remain = size; 464 retval = kvcprintf(format, snprintf_func, &info, ap); 465 if (info.remain >= 1) 466 *info.str++ = '\0'; 467 return (retval); 468 } 469 470 void 471 kvasfree(char **strp) 472 { 473 if (*strp) { 474 kfree(*strp, M_TEMP); 475 *strp = NULL; 476 } 477 } 478 479 static void 480 snprintf_func(int ch, void *arg) 481 { 482 struct snprintf_arg *const info = arg; 483 484 if (info->remain >= 2) { 485 *info->str++ = ch; 486 info->remain--; 487 } 488 } 489 490 /* 491 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 492 * order; return an optional length and a pointer to the last character 493 * written in the buffer (i.e., the first character of the string). 494 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 495 */ 496 static char * 497 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 498 { 499 char *p, c; 500 501 p = nbuf; 502 *p = '\0'; 503 do { 504 c = hex2ascii(num % base); 505 *++p = upper ? toupper(c) : c; 506 } while (num /= base); 507 if (lenp) 508 *lenp = p - nbuf; 509 return (p); 510 } 511 512 /* 513 * Scaled down version of printf(3). 514 * 515 * Two additional formats: 516 * 517 * The format %pb%i is supported to decode error registers. 518 * The use %b format is deprecated. 519 * Its usage is: 520 * 521 * kprintf("reg=%pb%i\n", "<base><arg>*", regval); 522 * 523 * where <base> is the output base expressed as a control character, e.g. 524 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 525 * the first of which gives the bit number to be inspected (origin 1), and 526 * the next characters (up to a control character, i.e. a character <= 32), 527 * give the name of the register. Thus: 528 * 529 * kvcprintf("reg=%pb%i\n", "\10\2BITTWO\1BITONE\n", 3); 530 * 531 * would produce output: 532 * 533 * reg=3<BITTWO,BITONE> 534 */ 535 536 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;} 537 538 int 539 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg, __va_list ap) 540 { 541 char nbuf[MAXNBUF]; 542 char *d; 543 const char *p, *percent, *q; 544 int ch, n; 545 uintmax_t num; 546 int base, tmp, width, ladjust, sharpflag, spaceflag, neg, sign, dot; 547 int cflag, hflag, jflag, lflag, qflag, tflag, zflag; 548 int dwidth, upper; 549 char padc; 550 int retval = 0, stop = 0; 551 int usespin; 552 553 /* 554 * Make a supreme effort to avoid reentrant panics or deadlocks. 555 * 556 * NOTE! Do nothing that would access mycpu/gd/fs unless the 557 * function is the normal kputchar(), which allows us to 558 * use this function for very early debugging with a special 559 * function. 560 */ 561 if (func == kputchar) { 562 if (mycpu->gd_flags & GDF_KPRINTF) 563 return(0); 564 atomic_set_long(&mycpu->gd_flags, GDF_KPRINTF); 565 } 566 567 num = 0; 568 if (!func) 569 d = (char *) arg; 570 else 571 d = NULL; 572 573 if (fmt == NULL) 574 fmt = "(fmt null)\n"; 575 576 usespin = (func == kputchar && 577 (kprintf_logging & TONOSPIN) == 0 && 578 panic_cpu_gd != mycpu && 579 (((struct putchar_arg *)arg)->flags & TOTTY) == 0); 580 if (usespin) { 581 crit_enter_hard(); 582 spin_lock(&cons_spin); 583 } 584 585 for (;;) { 586 padc = ' '; 587 width = 0; 588 while ((ch = (u_char)*fmt++) != '%' || stop) { 589 if (ch == '\0') 590 goto done; 591 PCHAR(ch); 592 } 593 percent = fmt - 1; 594 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0; 595 spaceflag = 0; 596 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0; 597 598 reswitch: 599 switch (ch = (u_char)*fmt++) { 600 case ' ': 601 spaceflag = 1; 602 goto reswitch; 603 case '.': 604 dot = 1; 605 goto reswitch; 606 case '#': 607 sharpflag = 1; 608 goto reswitch; 609 case '+': 610 sign = 1; 611 goto reswitch; 612 case '-': 613 ladjust = 1; 614 goto reswitch; 615 case '%': 616 PCHAR(ch); 617 break; 618 case '*': 619 if (!dot) { 620 width = __va_arg(ap, int); 621 if (width < 0) { 622 ladjust = !ladjust; 623 width = -width; 624 } 625 } else { 626 dwidth = __va_arg(ap, int); 627 } 628 goto reswitch; 629 case '0': 630 if (!dot) { 631 padc = '0'; 632 goto reswitch; 633 } 634 case '1': case '2': case '3': case '4': 635 case '5': case '6': case '7': case '8': case '9': 636 for (n = 0;; ++fmt) { 637 n = n * 10 + ch - '0'; 638 ch = *fmt; 639 if (ch < '0' || ch > '9') 640 break; 641 } 642 if (dot) 643 dwidth = n; 644 else 645 width = n; 646 goto reswitch; 647 case 'b': 648 num = (u_int)__va_arg(ap, int); 649 p = __va_arg(ap, char *); 650 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 651 PCHAR(*q--); 652 653 if (num == 0) 654 break; 655 656 for (tmp = 0; *p;) { 657 n = *p++; 658 if (num & (1 << (n - 1))) { 659 PCHAR(tmp ? ',' : '<'); 660 for (; (n = *p) > ' '; ++p) 661 PCHAR(n); 662 tmp = 1; 663 } else 664 for (; *p > ' '; ++p) 665 continue; 666 } 667 if (tmp) 668 PCHAR('>'); 669 break; 670 case 'c': 671 PCHAR(__va_arg(ap, int)); 672 break; 673 case 'd': 674 case 'i': 675 base = 10; 676 sign = 1; 677 goto handle_sign; 678 case 'h': 679 if (hflag) { 680 hflag = 0; 681 cflag = 1; 682 } else 683 hflag = 1; 684 goto reswitch; 685 case 'j': 686 jflag = 1; 687 goto reswitch; 688 case 'l': 689 if (lflag) { 690 lflag = 0; 691 qflag = 1; 692 } else 693 lflag = 1; 694 goto reswitch; 695 case 'n': 696 if (cflag) 697 *(__va_arg(ap, char *)) = retval; 698 else if (hflag) 699 *(__va_arg(ap, short *)) = retval; 700 else if (jflag) 701 *(__va_arg(ap, intmax_t *)) = retval; 702 else if (lflag) 703 *(__va_arg(ap, long *)) = retval; 704 else if (qflag) 705 *(__va_arg(ap, quad_t *)) = retval; 706 else 707 *(__va_arg(ap, int *)) = retval; 708 break; 709 case 'o': 710 base = 8; 711 goto handle_nosign; 712 case 'p': 713 /* peek if this is a /b/ hiding as /p/ or not */ 714 if (fmt[0] == 'b' && fmt[1] == '%' && fmt[2] == 'i') { 715 fmt += 3; /* consume "b%i" */ 716 p = __va_arg(ap, char *); 717 num = (u_int)__va_arg(ap, int); 718 for (q = ksprintn(nbuf, num, *p++, NULL, 0);*q;) 719 PCHAR(*q--); 720 721 if (num == 0) 722 break; 723 724 for (tmp = 0; *p;) { 725 n = *p++; 726 if (num & (1 << (n - 1))) { 727 PCHAR(tmp ? ',' : '<'); 728 for (; (n = *p) > ' '; ++p) 729 PCHAR(n); 730 tmp = 1; 731 } else { 732 for (; *p > ' '; ++p) 733 continue; 734 } 735 } 736 if (tmp) 737 PCHAR('>'); 738 break; 739 } 740 base = 16; 741 sharpflag = (width == 0); 742 sign = 0; 743 num = (uintptr_t)__va_arg(ap, void *); 744 goto number; 745 case 'q': 746 qflag = 1; 747 goto reswitch; 748 case 's': 749 p = __va_arg(ap, char *); 750 if (p == NULL) 751 p = "(null)"; 752 if (!dot) 753 n = strlen (p); 754 else 755 for (n = 0; n < dwidth && p[n]; n++) 756 continue; 757 758 width -= n; 759 760 if (!ladjust && width > 0) 761 while (width--) 762 PCHAR(padc); 763 while (n--) 764 PCHAR(*p++); 765 if (ladjust && width > 0) 766 while (width--) 767 PCHAR(padc); 768 break; 769 case 't': 770 tflag = 1; 771 goto reswitch; 772 case 'u': 773 base = 10; 774 goto handle_nosign; 775 case 'X': 776 upper = 1; 777 /* FALLTHROUGH */ 778 case 'x': 779 base = 16; 780 goto handle_nosign; 781 case 'z': 782 zflag = 1; 783 goto reswitch; 784 handle_nosign: 785 sign = 0; 786 if (cflag) 787 num = (u_char)__va_arg(ap, int); 788 else if (hflag) 789 num = (u_short)__va_arg(ap, int); 790 else if (jflag) 791 num = __va_arg(ap, uintmax_t); 792 else if (lflag) 793 num = __va_arg(ap, u_long); 794 else if (qflag) 795 num = __va_arg(ap, u_quad_t); 796 else if (tflag) 797 num = __va_arg(ap, ptrdiff_t); 798 else if (zflag) 799 num = __va_arg(ap, size_t); 800 else 801 num = __va_arg(ap, u_int); 802 goto number; 803 handle_sign: 804 if (cflag) 805 num = (char)__va_arg(ap, int); 806 else if (hflag) 807 num = (short)__va_arg(ap, int); 808 else if (jflag) 809 num = __va_arg(ap, intmax_t); 810 else if (lflag) 811 num = __va_arg(ap, long); 812 else if (qflag) 813 num = __va_arg(ap, quad_t); 814 else if (tflag) 815 num = __va_arg(ap, ptrdiff_t); 816 else if (zflag) 817 num = __va_arg(ap, ssize_t); 818 else 819 num = __va_arg(ap, int); 820 number: 821 if (sign && (intmax_t)num < 0) { 822 neg = 1; 823 num = -(intmax_t)num; 824 } 825 p = ksprintn(nbuf, num, base, &n, upper); 826 tmp = 0; 827 if (sharpflag && num != 0) { 828 if (base == 8) 829 tmp++; 830 else if (base == 16) 831 tmp += 2; 832 } 833 if (neg || (sign && spaceflag)) 834 tmp++; 835 836 if (!ladjust && padc == '0') 837 dwidth = width - tmp; 838 width -= tmp + imax(dwidth, n); 839 dwidth -= n; 840 if (!ladjust) 841 while (width-- > 0) 842 PCHAR(' '); 843 if (neg) { 844 PCHAR('-'); 845 } else if (sign && spaceflag) { 846 PCHAR(' '); 847 } 848 if (sharpflag && num != 0) { 849 if (base == 8) { 850 PCHAR('0'); 851 } else if (base == 16) { 852 PCHAR('0'); 853 PCHAR('x'); 854 } 855 } 856 while (dwidth-- > 0) 857 PCHAR('0'); 858 859 while (*p) 860 PCHAR(*p--); 861 862 if (ladjust) 863 while (width-- > 0) 864 PCHAR(' '); 865 866 break; 867 default: 868 while (percent < fmt) 869 PCHAR(*percent++); 870 /* 871 * Since we ignore an formatting argument it is no 872 * longer safe to obey the remaining formatting 873 * arguments as the arguments will no longer match 874 * the format specs. 875 */ 876 stop = 1; 877 break; 878 } 879 } 880 done: 881 /* 882 * Cleanup reentrancy issues. 883 */ 884 if (func == kputchar) 885 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF); 886 if (usespin) { 887 spin_unlock(&cons_spin); 888 crit_exit_hard(); 889 } 890 return (retval); 891 } 892 893 #undef PCHAR 894 895 /* 896 * Called from the panic code to try to get the console working 897 * again in case we paniced inside a kprintf(). 898 */ 899 void 900 kvcreinitspin(void) 901 { 902 spin_init(&cons_spin, "kvcre"); 903 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF); 904 } 905 906 /* 907 * Console support thread for constty intercepts. This is needed because 908 * console tty intercepts can block. Instead of having kputchar() attempt 909 * to directly write to the console intercept we just force it to log 910 * and wakeup this baby to track and dump the log to constty. 911 */ 912 static void 913 constty_daemon(void) 914 { 915 u_int rindex; 916 u_int xindex; 917 u_int n; 918 struct msgbuf *mbp; 919 struct tty *tp; 920 921 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, 922 constty_td, SHUTDOWN_PRI_FIRST); 923 constty_td->td_flags |= TDF_SYSTHREAD; 924 925 mbp = msgbufp; 926 rindex = mbp->msg_bufr; /* persistent loop variable */ 927 xindex = mbp->msg_bufx - 1; /* anything different than bufx */ 928 cpu_ccfence(); 929 930 for (;;) { 931 kproc_suspend_loop(); 932 933 crit_enter(); 934 if (mbp != msgbufp) 935 mbp = msgbufp; 936 if (xindex == mbp->msg_bufx || 937 mbp == NULL || 938 msgbufmapped == 0) { 939 tsleep(constty_td, 0, "waiting", hz*60); 940 crit_exit(); 941 continue; 942 } 943 crit_exit(); 944 945 /* 946 * Get message buf FIFO indices. rindex is tracking. 947 */ 948 xindex = mbp->msg_bufx; 949 cpu_ccfence(); 950 if ((tp = constty) == NULL) { 951 rindex = xindex; 952 continue; 953 } 954 955 /* 956 * Check if the calculated bytes has rolled the whole 957 * message buffer. 958 */ 959 n = xindex - rindex; 960 if (n > mbp->msg_size - 1024) { 961 rindex = xindex - mbp->msg_size + 2048; 962 n = xindex - rindex; 963 } 964 965 /* 966 * And dump it. If constty gets stuck will give up. 967 */ 968 while (rindex != xindex) { 969 u_int ri = rindex % mbp->msg_size; 970 if (tputchar((uint8_t)mbp->msg_ptr[ri], tp) < 0) { 971 constty = NULL; 972 rindex = xindex; 973 break; 974 } 975 if (tp->t_outq.c_cc >= tp->t_ohiwat) { 976 tsleep(constty_daemon, 0, "blocked", hz / 10); 977 if (tp->t_outq.c_cc >= tp->t_ohiwat) { 978 rindex = xindex; 979 break; 980 } 981 } 982 ++rindex; 983 } 984 } 985 } 986 987 static struct kproc_desc constty_kp = { 988 "consttyd", 989 constty_daemon, 990 &constty_td 991 }; 992 SYSINIT(bufdaemon, SI_SUB_KTHREAD_UPDATE, SI_ORDER_ANY, 993 kproc_start, &constty_kp); 994 995 /* 996 * Put character in log buffer with a particular priority. 997 * 998 * MPSAFE 999 */ 1000 static void 1001 msglogchar(int c, int pri) 1002 { 1003 static int lastpri = -1; 1004 static int dangling; 1005 char nbuf[MAXNBUF]; 1006 char *p; 1007 1008 if (!msgbufmapped) 1009 return; 1010 if (c == '\0' || c == '\r') 1011 return; 1012 if (pri != -1 && pri != lastpri) { 1013 if (dangling) { 1014 msgaddchar('\n', NULL); 1015 dangling = 0; 1016 } 1017 msgaddchar('<', NULL); 1018 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 1019 msgaddchar(*p--, NULL); 1020 msgaddchar('>', NULL); 1021 lastpri = pri; 1022 } 1023 msgaddchar(c, NULL); 1024 if (c == '\n') { 1025 dangling = 0; 1026 lastpri = -1; 1027 } else { 1028 dangling = 1; 1029 } 1030 } 1031 1032 /* 1033 * Put char in log buffer. Make sure nothing blows up beyond repair if 1034 * we have an MP race. 1035 * 1036 * MPSAFE. 1037 */ 1038 static void 1039 msgaddchar(int c, void *dummy) 1040 { 1041 struct msgbuf *mbp; 1042 u_int lindex; 1043 u_int rindex; 1044 u_int xindex; 1045 u_int n; 1046 1047 if (!msgbufmapped) 1048 return; 1049 mbp = msgbufp; 1050 lindex = mbp->msg_bufl; 1051 rindex = mbp->msg_bufr; 1052 xindex = mbp->msg_bufx++; /* Allow SMP race */ 1053 cpu_ccfence(); 1054 1055 mbp->msg_ptr[xindex % mbp->msg_size] = c; 1056 n = xindex - lindex; 1057 if (n > mbp->msg_size - 1024) { 1058 lindex = xindex - mbp->msg_size + 2048; 1059 cpu_ccfence(); 1060 mbp->msg_bufl = lindex; 1061 } 1062 n = xindex - rindex; 1063 if (n > mbp->msg_size - 1024) { 1064 rindex = xindex - mbp->msg_size + 2048; 1065 cpu_ccfence(); 1066 mbp->msg_bufr = rindex; 1067 } 1068 } 1069 1070 static void 1071 msgbufcopy(struct msgbuf *oldp) 1072 { 1073 u_int rindex; 1074 u_int xindex; 1075 u_int n; 1076 1077 rindex = oldp->msg_bufr; 1078 xindex = oldp->msg_bufx; 1079 cpu_ccfence(); 1080 1081 n = xindex - rindex; 1082 if (n > oldp->msg_size - 1024) 1083 rindex = xindex - oldp->msg_size + 2048; 1084 while (rindex != xindex) { 1085 msglogchar(oldp->msg_ptr[rindex % oldp->msg_size], -1); 1086 ++rindex; 1087 } 1088 } 1089 1090 void 1091 msgbufinit(void *ptr, size_t size) 1092 { 1093 char *cp; 1094 static struct msgbuf *oldp = NULL; 1095 1096 size -= sizeof(*msgbufp); 1097 cp = (char *)ptr; 1098 msgbufp = (struct msgbuf *) (cp + size); 1099 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size) { 1100 bzero(cp, size); 1101 bzero(msgbufp, sizeof(*msgbufp)); 1102 msgbufp->msg_magic = MSG_MAGIC; 1103 msgbufp->msg_size = (char *)msgbufp - cp; 1104 } 1105 msgbufp->msg_ptr = cp; 1106 if (msgbufmapped && oldp != msgbufp) 1107 msgbufcopy(oldp); 1108 cpu_mfence(); 1109 msgbufmapped = 1; 1110 oldp = msgbufp; 1111 } 1112 1113 /* Sysctls for accessing/clearing the msgbuf */ 1114 1115 static int 1116 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 1117 { 1118 struct msgbuf *mbp; 1119 struct ucred *cred; 1120 int error; 1121 u_int rindex_modulo; 1122 u_int xindex_modulo; 1123 u_int rindex; 1124 u_int xindex; 1125 u_int n; 1126 1127 /* 1128 * Only wheel or root can access the message log. 1129 */ 1130 if (unprivileged_read_msgbuf == 0) { 1131 KKASSERT(req->td->td_proc); 1132 cred = req->td->td_proc->p_ucred; 1133 1134 if ((cred->cr_prison || groupmember(0, cred) == 0) && 1135 priv_check(req->td, PRIV_ROOT) != 0 1136 ) { 1137 return (EPERM); 1138 } 1139 } 1140 1141 /* 1142 * Unwind the buffer, so that it's linear (possibly starting with 1143 * some initial nulls). 1144 * 1145 * We don't push the entire buffer like we did before because 1146 * bufr (and bufl) now advance in chunks when the fifo is full, 1147 * rather than one character. 1148 */ 1149 mbp = msgbufp; 1150 rindex = mbp->msg_bufr; 1151 xindex = mbp->msg_bufx; 1152 n = xindex - rindex; 1153 if (n > mbp->msg_size - 1024) { 1154 rindex = xindex - mbp->msg_size + 2048; 1155 n = xindex - rindex; 1156 } 1157 rindex_modulo = rindex % mbp->msg_size; 1158 xindex_modulo = xindex % mbp->msg_size; 1159 1160 if (rindex_modulo < xindex_modulo) { 1161 /* 1162 * Can handle in one linear section. 1163 */ 1164 error = sysctl_handle_opaque(oidp, 1165 mbp->msg_ptr + rindex_modulo, 1166 xindex_modulo - rindex_modulo, 1167 req); 1168 } else if (rindex_modulo == xindex_modulo) { 1169 /* 1170 * Empty buffer, just return a single newline 1171 */ 1172 error = sysctl_handle_opaque(oidp, "\n", 1, req); 1173 } else if (n <= mbp->msg_size - rindex_modulo) { 1174 /* 1175 * Can handle in one linear section. 1176 */ 1177 error = sysctl_handle_opaque(oidp, 1178 mbp->msg_ptr + rindex_modulo, 1179 n - rindex_modulo, 1180 req); 1181 } else { 1182 /* 1183 * Glue together two linear sections into one contiguous 1184 * output. 1185 */ 1186 error = sysctl_handle_opaque(oidp, 1187 mbp->msg_ptr + rindex_modulo, 1188 mbp->msg_size - rindex_modulo, 1189 req); 1190 n -= mbp->msg_size - rindex_modulo; 1191 if (error == 0) 1192 error = sysctl_handle_opaque(oidp, mbp->msg_ptr, 1193 n, req); 1194 } 1195 return (error); 1196 } 1197 1198 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 1199 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 1200 1201 static int msgbuf_clear; 1202 1203 static int 1204 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 1205 { 1206 int error; 1207 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 1208 if (!error && req->newptr) { 1209 /* Clear the buffer and reset write pointer */ 1210 msgbufp->msg_bufr = msgbufp->msg_bufx; 1211 msgbufp->msg_bufl = msgbufp->msg_bufx; 1212 bzero(msgbufp->msg_ptr, msgbufp->msg_size); 1213 msgbuf_clear = 0; 1214 } 1215 return (error); 1216 } 1217 1218 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 1219 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0, 1220 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 1221 1222 #ifdef DDB 1223 1224 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 1225 { 1226 u_int rindex; 1227 u_int i; 1228 u_int j; 1229 1230 if (!msgbufmapped) { 1231 db_printf("msgbuf not mapped yet\n"); 1232 return; 1233 } 1234 db_printf("msgbufp = %p\n", msgbufp); 1235 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", 1236 msgbufp->msg_magic, msgbufp->msg_size, 1237 msgbufp->msg_bufr % msgbufp->msg_size, 1238 msgbufp->msg_bufx % msgbufp->msg_size, 1239 msgbufp->msg_ptr); 1240 1241 rindex = msgbufp->msg_bufr; 1242 for (i = 0; i < msgbufp->msg_size; i++) { 1243 j = (i + rindex) % msgbufp->msg_size; 1244 db_printf("%c", msgbufp->msg_ptr[j]); 1245 } 1246 db_printf("\n"); 1247 } 1248 1249 #endif /* DDB */ 1250 1251 1252 void 1253 hexdump(const void *ptr, int length, const char *hdr, int flags) 1254 { 1255 int i, j, k; 1256 int cols; 1257 const unsigned char *cp; 1258 char delim; 1259 1260 if ((flags & HD_DELIM_MASK) != 0) 1261 delim = (flags & HD_DELIM_MASK) >> 8; 1262 else 1263 delim = ' '; 1264 1265 if ((flags & HD_COLUMN_MASK) != 0) 1266 cols = flags & HD_COLUMN_MASK; 1267 else 1268 cols = 16; 1269 1270 cp = ptr; 1271 for (i = 0; i < length; i+= cols) { 1272 if (hdr != NULL) 1273 kprintf("%s", hdr); 1274 1275 if ((flags & HD_OMIT_COUNT) == 0) 1276 kprintf("%04x ", i); 1277 1278 if ((flags & HD_OMIT_HEX) == 0) { 1279 for (j = 0; j < cols; j++) { 1280 k = i + j; 1281 if (k < length) 1282 kprintf("%c%02x", delim, cp[k]); 1283 else 1284 kprintf(" "); 1285 } 1286 } 1287 1288 if ((flags & HD_OMIT_CHARS) == 0) { 1289 kprintf(" |"); 1290 for (j = 0; j < cols; j++) { 1291 k = i + j; 1292 if (k >= length) 1293 kprintf(" "); 1294 else if (cp[k] >= ' ' && cp[k] <= '~') 1295 kprintf("%c", cp[k]); 1296 else 1297 kprintf("."); 1298 } 1299 kprintf("|"); 1300 } 1301 kprintf("\n"); 1302 } 1303 } 1304 1305 void 1306 kprint_cpuset(cpumask_t *mask) 1307 { 1308 int i; 1309 int b = -1; 1310 int e = -1; 1311 int more = 0; 1312 1313 kprintf("cpus("); 1314 CPUSET_FOREACH(i, *mask) { 1315 if (b < 0) { 1316 b = i; 1317 e = b + 1; 1318 continue; 1319 } 1320 if (e == i) { 1321 ++e; 1322 continue; 1323 } 1324 if (more) 1325 kprintf(", "); 1326 if (b == e - 1) { 1327 kprintf("%d", b); 1328 } else { 1329 kprintf("%d-%d", b, e - 1); 1330 } 1331 more = 1; 1332 b = i; 1333 e = b + 1; 1334 } 1335 if (more) 1336 kprintf(", "); 1337 if (b >= 0) { 1338 if (b == e - 1) { 1339 kprintf("%d", b); 1340 } else { 1341 kprintf("%d-%d", b, e - 1); 1342 } 1343 } 1344 kprintf(") "); 1345 } 1346