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 79 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 80 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 81 82 struct putchar_arg { 83 int flags; 84 int pri; 85 struct tty *tty; 86 }; 87 88 struct snprintf_arg { 89 char *str; 90 size_t remain; 91 }; 92 93 extern int log_open; 94 95 struct tty *constty; /* pointer to console "window" tty */ 96 97 static void msglogchar(int c, int pri); 98 static void msgaddchar(int c, void *dummy); 99 static void kputchar (int ch, void *arg); 100 static char *ksprintn (char *nbuf, uintmax_t num, int base, int *lenp, 101 int upper); 102 static void snprintf_func (int ch, void *arg); 103 104 static int consintr = 1; /* Ok to handle console interrupts? */ 105 static int msgbufmapped; /* Set when safe to use msgbuf */ 106 static struct spinlock cons_spin = SPINLOCK_INITIALIZER(cons_spin, "cons_spin"); 107 static thread_t constty_td = NULL; 108 109 int msgbuftrigger; 110 111 static int log_console_output = 1; 112 TUNABLE_INT("kern.log_console_output", &log_console_output); 113 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 114 &log_console_output, 0, ""); 115 116 static int unprivileged_read_msgbuf = 1; 117 SYSCTL_INT(_security, OID_AUTO, unprivileged_read_msgbuf, CTLFLAG_RW, 118 &unprivileged_read_msgbuf, 0, 119 "Unprivileged processes may read the kernel message buffer"); 120 121 /* 122 * Warn that a system table is full. 123 */ 124 void 125 tablefull(const char *tab) 126 { 127 128 log(LOG_ERR, "%s: table is full\n", tab); 129 } 130 131 /* 132 * Uprintf prints to the controlling terminal for the current process. 133 */ 134 int 135 uprintf(const char *fmt, ...) 136 { 137 struct proc *p = curproc; 138 __va_list ap; 139 struct putchar_arg pca; 140 int retval = 0; 141 142 if (p && (p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 143 __va_start(ap, fmt); 144 pca.tty = p->p_session->s_ttyp; 145 pca.flags = TOTTY; 146 147 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 148 __va_end(ap); 149 } 150 return (retval); 151 } 152 153 tpr_t 154 tprintf_open(struct proc *p) 155 { 156 if ((p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 157 sess_hold(p->p_session); 158 return ((tpr_t) p->p_session); 159 } 160 return (NULL); 161 } 162 163 void 164 tprintf_close(tpr_t sess) 165 { 166 if (sess) 167 sess_rele((struct session *) sess); 168 } 169 170 /* 171 * tprintf prints on the controlling terminal associated 172 * with the given session. 173 */ 174 int 175 tprintf(tpr_t tpr, const char *fmt, ...) 176 { 177 struct session *sess = (struct session *)tpr; 178 struct tty *tp = NULL; 179 int flags = TOLOG; 180 __va_list ap; 181 struct putchar_arg pca; 182 int retval; 183 184 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 185 flags |= TOTTY; 186 tp = sess->s_ttyp; 187 } 188 __va_start(ap, fmt); 189 pca.tty = tp; 190 pca.flags = flags; 191 pca.pri = LOG_INFO; 192 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 193 __va_end(ap); 194 msgbuftrigger = 1; 195 return (retval); 196 } 197 198 /* 199 * Ttyprintf displays a message on a tty; it should be used only by 200 * the tty driver, or anything that knows the underlying tty will not 201 * be revoke(2)'d away. Other callers should use tprintf. 202 */ 203 int 204 ttyprintf(struct tty *tp, const char *fmt, ...) 205 { 206 __va_list ap; 207 struct putchar_arg pca; 208 int retval; 209 210 __va_start(ap, fmt); 211 pca.tty = tp; 212 pca.flags = TOTTY; 213 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 214 __va_end(ap); 215 return (retval); 216 } 217 218 /* 219 * Log writes to the log buffer, and guarantees not to sleep (so can be 220 * called by interrupt routines). If there is no process reading the 221 * log yet, it writes to the console also. 222 */ 223 int 224 log(int level, const char *fmt, ...) 225 { 226 __va_list ap; 227 int retval; 228 struct putchar_arg pca; 229 230 pca.tty = NULL; 231 pca.pri = level; 232 pca.flags = log_open ? TOLOG : TOCONS; 233 234 __va_start(ap, fmt); 235 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 236 __va_end(ap); 237 238 msgbuftrigger = 1; 239 return (retval); 240 } 241 242 #define CONSCHUNK 128 243 244 void 245 log_console(struct uio *uio) 246 { 247 int c, i, error, iovlen, nl; 248 struct uio muio; 249 struct iovec *miov = NULL; 250 char *consbuffer; 251 int pri; 252 253 if (!log_console_output) 254 return; 255 256 pri = LOG_INFO | LOG_CONSOLE; 257 muio = *uio; 258 iovlen = uio->uio_iovcnt * sizeof (struct iovec); 259 miov = kmalloc(iovlen, M_TEMP, M_WAITOK); 260 consbuffer = kmalloc(CONSCHUNK, M_TEMP, M_WAITOK); 261 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen); 262 muio.uio_iov = miov; 263 uio = &muio; 264 265 nl = 0; 266 while (uio->uio_resid > 0) { 267 c = (int)szmin(uio->uio_resid, CONSCHUNK); 268 error = uiomove(consbuffer, (size_t)c, uio); 269 if (error != 0) 270 break; 271 for (i = 0; i < c; i++) { 272 msglogchar(consbuffer[i], pri); 273 if (consbuffer[i] == '\n') 274 nl = 1; 275 else 276 nl = 0; 277 } 278 } 279 if (!nl) 280 msglogchar('\n', pri); 281 msgbuftrigger = 1; 282 kfree(miov, M_TEMP); 283 kfree(consbuffer, M_TEMP); 284 return; 285 } 286 287 /* 288 * Output to the console. 289 */ 290 int 291 kprintf(const char *fmt, ...) 292 { 293 __va_list ap; 294 int savintr; 295 struct putchar_arg pca; 296 int retval; 297 298 savintr = consintr; /* disable interrupts */ 299 consintr = 0; 300 __va_start(ap, fmt); 301 pca.tty = NULL; 302 pca.flags = TOCONS | TOLOG; 303 pca.pri = -1; 304 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 305 __va_end(ap); 306 if (!panicstr) 307 msgbuftrigger = 1; 308 consintr = savintr; /* reenable interrupts */ 309 return (retval); 310 } 311 312 int 313 kvprintf(const char *fmt, __va_list ap) 314 { 315 int savintr; 316 struct putchar_arg pca; 317 int retval; 318 319 savintr = consintr; /* disable interrupts */ 320 consintr = 0; 321 pca.tty = NULL; 322 pca.flags = TOCONS | TOLOG; 323 pca.pri = -1; 324 retval = kvcprintf(fmt, kputchar, &pca, 10, ap); 325 if (!panicstr) 326 msgbuftrigger = 1; 327 consintr = savintr; /* reenable interrupts */ 328 return (retval); 329 } 330 331 /* 332 * Limited rate kprintf. The passed rate structure must be initialized 333 * with the desired reporting frequency. A frequency of 0 will result in 334 * no output. 335 * 336 * count may be initialized to a negative number to allow an initial 337 * burst. 338 */ 339 void 340 krateprintf(struct krate *rate, const char *fmt, ...) 341 { 342 __va_list ap; 343 344 if (rate->ticks != (int)time_uptime) { 345 rate->ticks = (int)time_uptime; 346 if (rate->count > 0) 347 rate->count = 0; 348 } 349 if (rate->count < rate->freq) { 350 ++rate->count; 351 __va_start(ap, fmt); 352 kvprintf(fmt, ap); 353 __va_end(ap); 354 } 355 } 356 357 /* 358 * Print a character to the dmesg log, the console, and/or the user's 359 * terminal. 360 * 361 * NOTE: TOTTY does not require nonblocking operation, but TOCONS 362 * and TOLOG do. When we have a constty we still output to 363 * the real console but we have a monitoring thread which 364 * we wakeup which tracks the log. 365 */ 366 static void 367 kputchar(int c, void *arg) 368 { 369 struct putchar_arg *ap = (struct putchar_arg*) arg; 370 int flags = ap->flags; 371 struct tty *tp = ap->tty; 372 373 if (panicstr) 374 constty = NULL; 375 if ((flags & TOCONS) && tp == NULL && constty) 376 flags |= TOLOG | TOWAKEUP; 377 if ((flags & TOTTY) && tputchar(c, tp) < 0) 378 ap->flags &= ~TOTTY; 379 if ((flags & TOLOG)) 380 msglogchar(c, ap->pri); 381 if ((flags & TOCONS) && c) 382 cnputc(c); 383 if (flags & TOWAKEUP) 384 wakeup(constty_td); 385 } 386 387 /* 388 * Scaled down version of sprintf(3). 389 */ 390 int 391 ksprintf(char *buf, const char *cfmt, ...) 392 { 393 int retval; 394 __va_list ap; 395 396 __va_start(ap, cfmt); 397 retval = kvcprintf(cfmt, NULL, buf, 10, ap); 398 buf[retval] = '\0'; 399 __va_end(ap); 400 return (retval); 401 } 402 403 /* 404 * Scaled down version of vsprintf(3). 405 */ 406 int 407 kvsprintf(char *buf, const char *cfmt, __va_list ap) 408 { 409 int retval; 410 411 retval = kvcprintf(cfmt, NULL, buf, 10, ap); 412 buf[retval] = '\0'; 413 return (retval); 414 } 415 416 /* 417 * Scaled down version of snprintf(3). 418 */ 419 int 420 ksnprintf(char *str, size_t size, const char *format, ...) 421 { 422 int retval; 423 __va_list ap; 424 425 __va_start(ap, format); 426 retval = kvsnprintf(str, size, format, ap); 427 __va_end(ap); 428 return(retval); 429 } 430 431 /* 432 * Scaled down version of vsnprintf(3). 433 */ 434 int 435 kvsnprintf(char *str, size_t size, const char *format, __va_list ap) 436 { 437 struct snprintf_arg info; 438 int retval; 439 440 info.str = str; 441 info.remain = size; 442 retval = kvcprintf(format, snprintf_func, &info, 10, ap); 443 if (info.remain >= 1) 444 *info.str++ = '\0'; 445 return (retval); 446 } 447 448 int 449 ksnrprintf(char *str, size_t size, int radix, const char *format, ...) 450 { 451 int retval; 452 __va_list ap; 453 454 __va_start(ap, format); 455 retval = kvsnrprintf(str, size, radix, format, ap); 456 __va_end(ap); 457 return(retval); 458 } 459 460 int 461 kvsnrprintf(char *str, size_t size, int radix, const char *format, __va_list ap) 462 { 463 struct snprintf_arg info; 464 int retval; 465 466 info.str = str; 467 info.remain = size; 468 retval = kvcprintf(format, snprintf_func, &info, radix, ap); 469 if (info.remain >= 1) 470 *info.str++ = '\0'; 471 return (retval); 472 } 473 474 int 475 kvasnrprintf(char **strp, size_t size, int radix, 476 const char *format, __va_list ap) 477 { 478 struct snprintf_arg info; 479 int retval; 480 481 *strp = kmalloc(size, M_TEMP, M_WAITOK); 482 info.str = *strp; 483 info.remain = size; 484 retval = kvcprintf(format, snprintf_func, &info, radix, ap); 485 if (info.remain >= 1) 486 *info.str++ = '\0'; 487 return (retval); 488 } 489 490 void 491 kvasfree(char **strp) 492 { 493 if (*strp) { 494 kfree(*strp, M_TEMP); 495 *strp = NULL; 496 } 497 } 498 499 static void 500 snprintf_func(int ch, void *arg) 501 { 502 struct snprintf_arg *const info = arg; 503 504 if (info->remain >= 2) { 505 *info->str++ = ch; 506 info->remain--; 507 } 508 } 509 510 /* 511 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 512 * order; return an optional length and a pointer to the last character 513 * written in the buffer (i.e., the first character of the string). 514 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 515 */ 516 static char * 517 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 518 { 519 char *p, c; 520 521 p = nbuf; 522 *p = '\0'; 523 do { 524 c = hex2ascii(num % base); 525 *++p = upper ? toupper(c) : c; 526 } while (num /= base); 527 if (lenp) 528 *lenp = p - nbuf; 529 return (p); 530 } 531 532 /* 533 * Scaled down version of printf(3). 534 * 535 * Two additional formats: 536 * 537 * The format %b is supported to decode error registers. 538 * Its usage is: 539 * 540 * kprintf("reg=%b\n", regval, "<base><arg>*"); 541 * 542 * where <base> is the output base expressed as a control character, e.g. 543 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 544 * the first of which gives the bit number to be inspected (origin 1), and 545 * the next characters (up to a control character, i.e. a character <= 32), 546 * give the name of the register. Thus: 547 * 548 * kvcprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 549 * 550 * would produce output: 551 * 552 * reg=3<BITTWO,BITONE> 553 */ 554 555 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;} 556 557 int 558 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg, 559 int radix, __va_list ap) 560 { 561 char nbuf[MAXNBUF]; 562 char *d; 563 const char *p, *percent, *q; 564 int ch, n; 565 uintmax_t num; 566 int base, tmp, width, ladjust, sharpflag, spaceflag, neg, sign, dot; 567 int cflag, hflag, jflag, lflag, qflag, tflag, zflag; 568 int dwidth, upper; 569 char padc; 570 int retval = 0, stop = 0; 571 int usespin; 572 573 /* 574 * Make a supreme effort to avoid reentrant panics or deadlocks. 575 * 576 * NOTE! Do nothing that would access mycpu/gd/fs unless the 577 * function is the normal kputchar(), which allows us to 578 * use this function for very early debugging with a special 579 * function. 580 */ 581 if (func == kputchar) { 582 if (mycpu->gd_flags & GDF_KPRINTF) 583 return(0); 584 atomic_set_long(&mycpu->gd_flags, GDF_KPRINTF); 585 } 586 587 num = 0; 588 if (!func) 589 d = (char *) arg; 590 else 591 d = NULL; 592 593 if (fmt == NULL) 594 fmt = "(fmt null)\n"; 595 596 if (radix < 2 || radix > 36) 597 radix = 10; 598 599 usespin = (func == kputchar && 600 panic_cpu_gd != mycpu && 601 (((struct putchar_arg *)arg)->flags & TOTTY) == 0); 602 if (usespin) { 603 crit_enter_hard(); 604 spin_lock(&cons_spin); 605 } 606 607 for (;;) { 608 padc = ' '; 609 width = 0; 610 while ((ch = (u_char)*fmt++) != '%' || stop) { 611 if (ch == '\0') 612 goto done; 613 PCHAR(ch); 614 } 615 percent = fmt - 1; 616 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0; 617 spaceflag = 0; 618 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0; 619 620 reswitch: 621 switch (ch = (u_char)*fmt++) { 622 case ' ': 623 spaceflag = 1; 624 goto reswitch; 625 case '.': 626 dot = 1; 627 goto reswitch; 628 case '#': 629 sharpflag = 1; 630 goto reswitch; 631 case '+': 632 sign = 1; 633 goto reswitch; 634 case '-': 635 ladjust = 1; 636 goto reswitch; 637 case '%': 638 PCHAR(ch); 639 break; 640 case '*': 641 if (!dot) { 642 width = __va_arg(ap, int); 643 if (width < 0) { 644 ladjust = !ladjust; 645 width = -width; 646 } 647 } else { 648 dwidth = __va_arg(ap, int); 649 } 650 goto reswitch; 651 case '0': 652 if (!dot) { 653 padc = '0'; 654 goto reswitch; 655 } 656 case '1': case '2': case '3': case '4': 657 case '5': case '6': case '7': case '8': case '9': 658 for (n = 0;; ++fmt) { 659 n = n * 10 + ch - '0'; 660 ch = *fmt; 661 if (ch < '0' || ch > '9') 662 break; 663 } 664 if (dot) 665 dwidth = n; 666 else 667 width = n; 668 goto reswitch; 669 case 'b': 670 num = (u_int)__va_arg(ap, int); 671 p = __va_arg(ap, char *); 672 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 673 PCHAR(*q--); 674 675 if (num == 0) 676 break; 677 678 for (tmp = 0; *p;) { 679 n = *p++; 680 if (num & (1 << (n - 1))) { 681 PCHAR(tmp ? ',' : '<'); 682 for (; (n = *p) > ' '; ++p) 683 PCHAR(n); 684 tmp = 1; 685 } else 686 for (; *p > ' '; ++p) 687 continue; 688 } 689 if (tmp) 690 PCHAR('>'); 691 break; 692 case 'c': 693 PCHAR(__va_arg(ap, int)); 694 break; 695 case 'd': 696 case 'i': 697 base = 10; 698 sign = 1; 699 goto handle_sign; 700 case 'h': 701 if (hflag) { 702 hflag = 0; 703 cflag = 1; 704 } else 705 hflag = 1; 706 goto reswitch; 707 case 'j': 708 jflag = 1; 709 goto reswitch; 710 case 'l': 711 if (lflag) { 712 lflag = 0; 713 qflag = 1; 714 } else 715 lflag = 1; 716 goto reswitch; 717 case 'n': 718 if (cflag) 719 *(__va_arg(ap, char *)) = retval; 720 else if (hflag) 721 *(__va_arg(ap, short *)) = retval; 722 else if (jflag) 723 *(__va_arg(ap, intmax_t *)) = retval; 724 else if (lflag) 725 *(__va_arg(ap, long *)) = retval; 726 else if (qflag) 727 *(__va_arg(ap, quad_t *)) = retval; 728 else 729 *(__va_arg(ap, int *)) = retval; 730 break; 731 case 'o': 732 base = 8; 733 goto handle_nosign; 734 case 'p': 735 base = 16; 736 sharpflag = (width == 0); 737 sign = 0; 738 num = (uintptr_t)__va_arg(ap, void *); 739 goto number; 740 case 'q': 741 qflag = 1; 742 goto reswitch; 743 case 'r': 744 base = radix; 745 if (sign) 746 goto handle_sign; 747 goto handle_nosign; 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 if (error) 1196 return (error); 1197 return (error); 1198 } 1199 1200 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 1201 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 1202 1203 static int msgbuf_clear; 1204 1205 static int 1206 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 1207 { 1208 int error; 1209 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 1210 if (!error && req->newptr) { 1211 /* Clear the buffer and reset write pointer */ 1212 msgbufp->msg_bufr = msgbufp->msg_bufx; 1213 msgbufp->msg_bufl = msgbufp->msg_bufx; 1214 bzero(msgbufp->msg_ptr, msgbufp->msg_size); 1215 msgbuf_clear = 0; 1216 } 1217 return (error); 1218 } 1219 1220 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 1221 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0, 1222 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 1223 1224 #ifdef DDB 1225 1226 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 1227 { 1228 u_int rindex; 1229 u_int i; 1230 u_int j; 1231 1232 if (!msgbufmapped) { 1233 db_printf("msgbuf not mapped yet\n"); 1234 return; 1235 } 1236 db_printf("msgbufp = %p\n", msgbufp); 1237 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", 1238 msgbufp->msg_magic, msgbufp->msg_size, 1239 msgbufp->msg_bufr % msgbufp->msg_size, 1240 msgbufp->msg_bufx % msgbufp->msg_size, 1241 msgbufp->msg_ptr); 1242 1243 rindex = msgbufp->msg_bufr; 1244 for (i = 0; i < msgbufp->msg_size; i++) { 1245 j = (i + rindex) % msgbufp->msg_size; 1246 db_printf("%c", msgbufp->msg_ptr[j]); 1247 } 1248 db_printf("\n"); 1249 } 1250 1251 #endif /* DDB */ 1252 1253 1254 void 1255 hexdump(const void *ptr, int length, const char *hdr, int flags) 1256 { 1257 int i, j, k; 1258 int cols; 1259 const unsigned char *cp; 1260 char delim; 1261 1262 if ((flags & HD_DELIM_MASK) != 0) 1263 delim = (flags & HD_DELIM_MASK) >> 8; 1264 else 1265 delim = ' '; 1266 1267 if ((flags & HD_COLUMN_MASK) != 0) 1268 cols = flags & HD_COLUMN_MASK; 1269 else 1270 cols = 16; 1271 1272 cp = ptr; 1273 for (i = 0; i < length; i+= cols) { 1274 if (hdr != NULL) 1275 kprintf("%s", hdr); 1276 1277 if ((flags & HD_OMIT_COUNT) == 0) 1278 kprintf("%04x ", i); 1279 1280 if ((flags & HD_OMIT_HEX) == 0) { 1281 for (j = 0; j < cols; j++) { 1282 k = i + j; 1283 if (k < length) 1284 kprintf("%c%02x", delim, cp[k]); 1285 else 1286 kprintf(" "); 1287 } 1288 } 1289 1290 if ((flags & HD_OMIT_CHARS) == 0) { 1291 kprintf(" |"); 1292 for (j = 0; j < cols; j++) { 1293 k = i + j; 1294 if (k >= length) 1295 kprintf(" "); 1296 else if (cp[k] >= ' ' && cp[k] <= '~') 1297 kprintf("%c", cp[k]); 1298 else 1299 kprintf("."); 1300 } 1301 kprintf("|"); 1302 } 1303 kprintf("\n"); 1304 } 1305 } 1306 1307 void 1308 kprint_cpuset(cpumask_t *mask) 1309 { 1310 int i; 1311 int b = -1; 1312 int e = -1; 1313 int more = 0; 1314 1315 kprintf("cpus("); 1316 CPUSET_FOREACH(i, *mask) { 1317 if (b < 0) { 1318 b = i; 1319 e = b + 1; 1320 continue; 1321 } 1322 if (e == i) { 1323 ++e; 1324 continue; 1325 } 1326 if (more) 1327 kprintf(", "); 1328 if (b == e - 1) { 1329 kprintf("%d", b); 1330 } else { 1331 kprintf("%d-%d", b, e - 1); 1332 } 1333 more = 1; 1334 b = i; 1335 e = b + 1; 1336 } 1337 if (more) 1338 kprintf(", "); 1339 if (b >= 0) { 1340 if (b == e - 1) { 1341 kprintf("%d", b); 1342 } else { 1343 kprintf("%d-%d", b, e - 1); 1344 } 1345 } 1346 kprintf(") "); 1347 } 1348