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 ptr_restrict = 0; 121 TUNABLE_INT("security.ptr_restrict", &ptr_restrict); 122 SYSCTL_INT(_security, OID_AUTO, ptr_restrict, CTLFLAG_RW, &ptr_restrict, 0, 123 "Prevent leaking the kernel pointers back to userland"); 124 125 static int unprivileged_read_msgbuf = 1; 126 SYSCTL_INT(_security, OID_AUTO, unprivileged_read_msgbuf, CTLFLAG_RW, 127 &unprivileged_read_msgbuf, 0, 128 "Unprivileged processes may read the kernel message buffer"); 129 130 /* 131 * Warn that a system table is full. 132 */ 133 void 134 tablefull(const char *tab) 135 { 136 137 log(LOG_ERR, "%s: table is full\n", tab); 138 } 139 140 /* 141 * Uprintf prints to the controlling terminal for the current process. 142 */ 143 int 144 uprintf(const char *fmt, ...) 145 { 146 struct proc *p = curproc; 147 __va_list ap; 148 struct putchar_arg pca; 149 int retval = 0; 150 151 if (p && (p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 152 __va_start(ap, fmt); 153 pca.tty = p->p_session->s_ttyp; 154 pca.flags = TOTTY; 155 156 retval = kvcprintf(fmt, kputchar, &pca, ap); 157 __va_end(ap); 158 } 159 return (retval); 160 } 161 162 tpr_t 163 tprintf_open(struct proc *p) 164 { 165 if ((p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 166 sess_hold(p->p_session); 167 return ((tpr_t) p->p_session); 168 } 169 return (NULL); 170 } 171 172 void 173 tprintf_close(tpr_t sess) 174 { 175 if (sess) 176 sess_rele((struct session *) sess); 177 } 178 179 /* 180 * tprintf prints on the controlling terminal associated 181 * with the given session. 182 */ 183 int 184 tprintf(tpr_t tpr, const char *fmt, ...) 185 { 186 struct session *sess = (struct session *)tpr; 187 struct tty *tp = NULL; 188 int flags = TOLOG; 189 __va_list ap; 190 struct putchar_arg pca; 191 int retval; 192 193 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 194 flags |= TOTTY; 195 tp = sess->s_ttyp; 196 } 197 __va_start(ap, fmt); 198 pca.tty = tp; 199 pca.flags = flags; 200 pca.pri = LOG_INFO; 201 retval = kvcprintf(fmt, kputchar, &pca, ap); 202 __va_end(ap); 203 msgbuftrigger = 1; 204 return (retval); 205 } 206 207 /* 208 * Ttyprintf displays a message on a tty; it should be used only by 209 * the tty driver, or anything that knows the underlying tty will not 210 * be revoke(2)'d away. Other callers should use tprintf. 211 */ 212 int 213 ttyprintf(struct tty *tp, const char *fmt, ...) 214 { 215 __va_list ap; 216 struct putchar_arg pca; 217 int retval; 218 219 __va_start(ap, fmt); 220 pca.tty = tp; 221 pca.flags = TOTTY; 222 retval = kvcprintf(fmt, kputchar, &pca, ap); 223 __va_end(ap); 224 return (retval); 225 } 226 227 /* 228 * Log writes to the log buffer, and guarantees not to sleep (so can be 229 * called by interrupt routines). If there is no process reading the 230 * log yet, it writes to the console also. 231 */ 232 int 233 log(int level, const char *fmt, ...) 234 { 235 __va_list ap; 236 int retval; 237 struct putchar_arg pca; 238 239 pca.tty = NULL; 240 pca.pri = level; 241 if ((kprintf_logging & TOCONS) == 0 || log_open) 242 pca.flags = TOLOG; 243 else 244 pca.flags = TOCONS; 245 246 __va_start(ap, fmt); 247 retval = kvcprintf(fmt, kputchar, &pca, ap); 248 __va_end(ap); 249 250 msgbuftrigger = 1; 251 return (retval); 252 } 253 254 #define CONSCHUNK 128 255 256 void 257 log_console(struct uio *uio) 258 { 259 int c, i, error, iovlen, nl; 260 struct uio muio; 261 struct iovec *miov = NULL; 262 char *consbuffer; 263 int pri; 264 265 if (!log_console_output) 266 return; 267 268 pri = LOG_INFO | LOG_CONSOLE; 269 muio = *uio; 270 iovlen = uio->uio_iovcnt * sizeof (struct iovec); 271 miov = kmalloc(iovlen, M_TEMP, M_WAITOK); 272 consbuffer = kmalloc(CONSCHUNK, M_TEMP, M_WAITOK); 273 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen); 274 muio.uio_iov = miov; 275 uio = &muio; 276 277 nl = 0; 278 while (uio->uio_resid > 0) { 279 c = (int)szmin(uio->uio_resid, CONSCHUNK); 280 error = uiomove(consbuffer, (size_t)c, uio); 281 if (error != 0) 282 break; 283 for (i = 0; i < c; i++) { 284 msglogchar(consbuffer[i], pri); 285 if (consbuffer[i] == '\n') 286 nl = 1; 287 else 288 nl = 0; 289 } 290 } 291 if (!nl) 292 msglogchar('\n', pri); 293 msgbuftrigger = 1; 294 kfree(miov, M_TEMP); 295 kfree(consbuffer, M_TEMP); 296 return; 297 } 298 299 /* 300 * Output to the console. 301 */ 302 int 303 kprintf(const char *fmt, ...) 304 { 305 __va_list ap; 306 int savintr; 307 struct putchar_arg pca; 308 int retval; 309 310 savintr = consintr; /* disable interrupts */ 311 consintr = 0; 312 __va_start(ap, fmt); 313 pca.tty = NULL; 314 pca.flags = kprintf_logging & ~TOTTY; 315 pca.pri = -1; 316 retval = kvcprintf(fmt, kputchar, &pca, ap); 317 __va_end(ap); 318 if (!panicstr) 319 msgbuftrigger = 1; 320 consintr = savintr; /* reenable interrupts */ 321 return (retval); 322 } 323 324 int 325 kvprintf(const char *fmt, __va_list ap) 326 { 327 int savintr; 328 struct putchar_arg pca; 329 int retval; 330 331 savintr = consintr; /* disable interrupts */ 332 consintr = 0; 333 pca.tty = NULL; 334 pca.flags = kprintf_logging & ~TOTTY; 335 pca.pri = -1; 336 retval = kvcprintf(fmt, kputchar, &pca, ap); 337 if (!panicstr) 338 msgbuftrigger = 1; 339 consintr = savintr; /* reenable interrupts */ 340 return (retval); 341 } 342 343 /* 344 * Limited rate kprintf. The passed rate structure must be initialized 345 * with the desired reporting frequency. A frequency of 0 will result in 346 * no output. 347 * 348 * count may be initialized to a negative number to allow an initial 349 * burst. 350 * 351 * Returns 0 if it did not issue the printf, non-zero if it did. 352 */ 353 int 354 krateprintf(struct krate *rate, const char *fmt, ...) 355 { 356 __va_list ap; 357 int res; 358 359 if (rate->ticks != (int)time_uptime) { 360 rate->ticks = (int)time_uptime; 361 if (rate->count > 0) 362 rate->count = 0; 363 } 364 if (rate->count < rate->freq) { 365 ++rate->count; 366 __va_start(ap, fmt); 367 kvprintf(fmt, ap); 368 __va_end(ap); 369 res = 1; 370 } else { 371 res = 0; 372 } 373 return res; 374 } 375 376 /* 377 * Print a character to the dmesg log, the console, and/or the user's 378 * terminal. 379 * 380 * NOTE: TOTTY does not require nonblocking operation, but TOCONS 381 * and TOLOG do. When we have a constty we still output to 382 * the real console but we have a monitoring thread which 383 * we wakeup which tracks the log. 384 */ 385 static void 386 kputchar(int c, void *arg) 387 { 388 struct putchar_arg *ap = (struct putchar_arg*) arg; 389 int flags = ap->flags; 390 struct tty *tp = ap->tty; 391 392 if (panicstr) 393 constty = NULL; 394 if ((flags & TOCONS) && tp == NULL && constty) 395 flags |= TOLOG | TOWAKEUP; 396 if ((flags & TOTTY) && tputchar(c, tp) < 0) 397 ap->flags &= ~TOTTY; 398 if ((flags & TOLOG)) 399 msglogchar(c, ap->pri); 400 if ((flags & TOCONS) && c) 401 cnputc(c); 402 if (flags & TOWAKEUP) 403 wakeup(constty_td); 404 } 405 406 /* 407 * Scaled down version of sprintf(3). 408 */ 409 int 410 ksprintf(char *buf, const char *cfmt, ...) 411 { 412 int retval; 413 __va_list ap; 414 415 __va_start(ap, cfmt); 416 retval = kvcprintf(cfmt, NULL, buf, ap); 417 buf[retval] = '\0'; 418 __va_end(ap); 419 return (retval); 420 } 421 422 /* 423 * Scaled down version of vsprintf(3). 424 */ 425 int 426 kvsprintf(char *buf, const char *cfmt, __va_list ap) 427 { 428 int retval; 429 430 retval = kvcprintf(cfmt, NULL, buf, ap); 431 buf[retval] = '\0'; 432 return (retval); 433 } 434 435 /* 436 * Scaled down version of snprintf(3). 437 */ 438 int 439 ksnprintf(char *str, size_t size, const char *format, ...) 440 { 441 int retval; 442 __va_list ap; 443 444 __va_start(ap, format); 445 retval = kvsnprintf(str, size, format, ap); 446 __va_end(ap); 447 return(retval); 448 } 449 450 /* 451 * Scaled down version of vsnprintf(3). 452 */ 453 int 454 kvsnprintf(char *str, size_t size, const char *format, __va_list ap) 455 { 456 struct snprintf_arg info; 457 int retval; 458 459 info.str = str; 460 info.remain = size; 461 retval = kvcprintf(format, snprintf_func, &info, ap); 462 if (info.remain >= 1) 463 *info.str++ = '\0'; 464 return (retval); 465 } 466 467 int 468 kvasnprintf(char **strp, size_t size, const char *format, __va_list ap) 469 { 470 struct snprintf_arg info; 471 int retval; 472 473 *strp = kmalloc(size, M_TEMP, M_WAITOK); 474 info.str = *strp; 475 info.remain = size; 476 retval = kvcprintf(format, snprintf_func, &info, ap); 477 if (info.remain >= 1) 478 *info.str++ = '\0'; 479 return (retval); 480 } 481 482 void 483 kvasfree(char **strp) 484 { 485 if (*strp) { 486 kfree(*strp, M_TEMP); 487 *strp = NULL; 488 } 489 } 490 491 static void 492 snprintf_func(int ch, void *arg) 493 { 494 struct snprintf_arg *const info = arg; 495 496 if (info->remain >= 2) { 497 *info->str++ = ch; 498 info->remain--; 499 } 500 } 501 502 /* 503 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 504 * order; return an optional length and a pointer to the last character 505 * written in the buffer (i.e., the first character of the string). 506 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 507 */ 508 static char * 509 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 510 { 511 char *p, c; 512 513 p = nbuf; 514 *p = '\0'; 515 do { 516 c = hex2ascii(num % base); 517 *++p = upper ? toupper(c) : c; 518 } while (num /= base); 519 if (lenp) 520 *lenp = p - nbuf; 521 return (p); 522 } 523 524 /* 525 * Scaled down version of printf(3). 526 * 527 * Two additional formats: 528 * 529 * The format %pb%i is supported to decode error registers. 530 * Its usage is: 531 * 532 * kprintf("reg=%pb%i\n", "<base><arg>*", regval); 533 * 534 * where <base> is the output base expressed as a control character, e.g. 535 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 536 * the first of which gives the bit number to be inspected (origin 1), and 537 * the next characters (up to a control character, i.e. a character <= 32), 538 * give the name of the register. Thus: 539 * 540 * kvcprintf("reg=%pb%i\n", "\10\2BITTWO\1BITONE\n", 3); 541 * 542 * would produce output: 543 * 544 * reg=3<BITTWO,BITONE> 545 */ 546 547 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;} 548 549 int 550 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg, __va_list ap) 551 { 552 char nbuf[MAXNBUF]; 553 char *d; 554 const char *p, *percent, *q; 555 int ch, n; 556 uintmax_t num; 557 int base, tmp, width, ladjust, sharpflag, spaceflag, neg, sign, dot; 558 int cflag, hflag, jflag, lflag, qflag, tflag, zflag; 559 int dwidth, upper; 560 char padc; 561 int retval = 0, stop = 0; 562 int usespin; 563 int ddb_active; 564 565 /* 566 * Make a supreme effort to avoid reentrant panics or deadlocks. 567 * 568 * NOTE! Do nothing that would access mycpu/gd/fs unless the 569 * function is the normal kputchar(), which allows us to 570 * use this function for very early debugging with a special 571 * function. 572 */ 573 if (func == kputchar) { 574 if (mycpu->gd_flags & GDF_KPRINTF) 575 return(0); 576 atomic_set_long(&mycpu->gd_flags, GDF_KPRINTF); 577 } 578 579 #ifdef DDB 580 ddb_active = db_active; 581 #else 582 ddb_active = 0; 583 #endif 584 585 num = 0; 586 if (!func) 587 d = (char *) arg; 588 else 589 d = NULL; 590 591 if (fmt == NULL) 592 fmt = "(fmt null)\n"; 593 594 usespin = (func == kputchar && 595 (kprintf_logging & TONOSPIN) == 0 && 596 panic_cpu_gd != mycpu && 597 (((struct putchar_arg *)arg)->flags & TOTTY) == 0); 598 if (usespin) { 599 crit_enter_hard(); 600 spin_lock(&cons_spin); 601 } 602 603 for (;;) { 604 padc = ' '; 605 width = 0; 606 while ((ch = (u_char)*fmt++) != '%' || stop) { 607 if (ch == '\0') 608 goto done; 609 PCHAR(ch); 610 } 611 percent = fmt - 1; 612 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0; 613 spaceflag = 0; 614 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0; 615 616 reswitch: 617 switch (ch = (u_char)*fmt++) { 618 case ' ': 619 spaceflag = 1; 620 goto reswitch; 621 case '.': 622 dot = 1; 623 goto reswitch; 624 case '#': 625 sharpflag = 1; 626 goto reswitch; 627 case '+': 628 sign = 1; 629 goto reswitch; 630 case '-': 631 ladjust = 1; 632 goto reswitch; 633 case '%': 634 PCHAR(ch); 635 break; 636 case '*': 637 if (!dot) { 638 width = __va_arg(ap, int); 639 if (width < 0) { 640 ladjust = !ladjust; 641 width = -width; 642 } 643 } else { 644 dwidth = __va_arg(ap, int); 645 } 646 goto reswitch; 647 case '0': 648 if (!dot) { 649 padc = '0'; 650 goto reswitch; 651 } 652 case '1': case '2': case '3': case '4': 653 case '5': case '6': case '7': case '8': case '9': 654 for (n = 0;; ++fmt) { 655 n = n * 10 + ch - '0'; 656 ch = *fmt; 657 if (ch < '0' || ch > '9') 658 break; 659 } 660 if (dot) 661 dwidth = n; 662 else 663 width = n; 664 goto reswitch; 665 case 'c': 666 PCHAR(__va_arg(ap, int)); 667 break; 668 case 'd': 669 case 'i': 670 base = 10; 671 sign = 1; 672 goto handle_sign; 673 case 'h': 674 if (hflag) { 675 hflag = 0; 676 cflag = 1; 677 } else 678 hflag = 1; 679 goto reswitch; 680 case 'j': 681 jflag = 1; 682 goto reswitch; 683 case 'l': 684 if (lflag) { 685 lflag = 0; 686 qflag = 1; 687 } else 688 lflag = 1; 689 goto reswitch; 690 case 'n': 691 if (cflag) 692 *(__va_arg(ap, char *)) = retval; 693 else if (hflag) 694 *(__va_arg(ap, short *)) = retval; 695 else if (jflag) 696 *(__va_arg(ap, intmax_t *)) = retval; 697 else if (lflag) 698 *(__va_arg(ap, long *)) = retval; 699 else if (qflag) 700 *(__va_arg(ap, quad_t *)) = retval; 701 else 702 *(__va_arg(ap, int *)) = retval; 703 break; 704 case 'o': 705 base = 8; 706 goto handle_nosign; 707 case 'p': 708 /* peek if this is a /b/ hiding as /p/ or not */ 709 if (fmt[0] == 'b' && fmt[1] == '%' && fmt[2] == 'i') { 710 fmt += 3; /* consume "b%i" */ 711 p = __va_arg(ap, char *); 712 num = (u_int)__va_arg(ap, int); 713 for (q = ksprintn(nbuf, num, *p++, NULL, 0);*q;) 714 PCHAR(*q--); 715 716 if (num == 0) 717 break; 718 719 for (tmp = 0; *p;) { 720 n = *p++; 721 if (num & (1 << (n - 1))) { 722 PCHAR(tmp ? ',' : '<'); 723 for (; (n = *p) > ' '; ++p) 724 PCHAR(n); 725 tmp = 1; 726 } else { 727 for (; *p > ' '; ++p) 728 continue; 729 } 730 } 731 if (tmp) 732 PCHAR('>'); 733 break; 734 } 735 base = 16; 736 sharpflag = (width == 0); 737 sign = 0; 738 num = (uintptr_t)__va_arg(ap, void *); 739 if (ptr_restrict && fmt[0] != 'x' && 740 !(panicstr || dumping || ddb_active)) { 741 if (ptr_restrict == 1) { 742 /* zero out upper bits */ 743 num &= 0xffffffUL; 744 } else { 745 num = 0xc0ffee; 746 } 747 } 748 goto number; 749 case 'q': 750 qflag = 1; 751 goto reswitch; 752 case 's': 753 p = __va_arg(ap, char *); 754 if (p == NULL) 755 p = "(null)"; 756 if (!dot) 757 n = strlen (p); 758 else 759 for (n = 0; n < dwidth && p[n]; n++) 760 continue; 761 762 width -= n; 763 764 if (!ladjust && width > 0) 765 while (width--) 766 PCHAR(padc); 767 while (n--) 768 PCHAR(*p++); 769 if (ladjust && width > 0) 770 while (width--) 771 PCHAR(padc); 772 break; 773 case 't': 774 tflag = 1; 775 goto reswitch; 776 case 'u': 777 base = 10; 778 goto handle_nosign; 779 case 'X': 780 upper = 1; 781 /* FALLTHROUGH */ 782 case 'x': 783 base = 16; 784 goto handle_nosign; 785 case 'z': 786 zflag = 1; 787 goto reswitch; 788 handle_nosign: 789 sign = 0; 790 if (cflag) 791 num = (u_char)__va_arg(ap, int); 792 else if (hflag) 793 num = (u_short)__va_arg(ap, int); 794 else if (jflag) 795 num = __va_arg(ap, uintmax_t); 796 else if (lflag) 797 num = __va_arg(ap, u_long); 798 else if (qflag) 799 num = __va_arg(ap, u_quad_t); 800 else if (tflag) 801 num = __va_arg(ap, ptrdiff_t); 802 else if (zflag) 803 num = __va_arg(ap, size_t); 804 else 805 num = __va_arg(ap, u_int); 806 goto number; 807 handle_sign: 808 if (cflag) 809 num = (char)__va_arg(ap, int); 810 else if (hflag) 811 num = (short)__va_arg(ap, int); 812 else if (jflag) 813 num = __va_arg(ap, intmax_t); 814 else if (lflag) 815 num = __va_arg(ap, long); 816 else if (qflag) 817 num = __va_arg(ap, quad_t); 818 else if (tflag) 819 num = __va_arg(ap, ptrdiff_t); 820 else if (zflag) 821 num = __va_arg(ap, ssize_t); 822 else 823 num = __va_arg(ap, int); 824 number: 825 if (sign && (intmax_t)num < 0) { 826 neg = 1; 827 num = -(intmax_t)num; 828 } 829 p = ksprintn(nbuf, num, base, &n, upper); 830 tmp = 0; 831 if (sharpflag && num != 0) { 832 if (base == 8) 833 tmp++; 834 else if (base == 16) 835 tmp += 2; 836 } 837 if (neg || (sign && spaceflag)) 838 tmp++; 839 840 if (!ladjust && padc == '0') 841 dwidth = width - tmp; 842 width -= tmp + imax(dwidth, n); 843 dwidth -= n; 844 if (!ladjust) 845 while (width-- > 0) 846 PCHAR(' '); 847 if (neg) { 848 PCHAR('-'); 849 } else if (sign && spaceflag) { 850 PCHAR(' '); 851 } 852 if (sharpflag && num != 0) { 853 if (base == 8) { 854 PCHAR('0'); 855 } else if (base == 16) { 856 PCHAR('0'); 857 PCHAR('x'); 858 } 859 } 860 while (dwidth-- > 0) 861 PCHAR('0'); 862 863 while (*p) 864 PCHAR(*p--); 865 866 if (ladjust) 867 while (width-- > 0) 868 PCHAR(' '); 869 870 break; 871 default: 872 while (percent < fmt) 873 PCHAR(*percent++); 874 /* 875 * Since we ignore an formatting argument it is no 876 * longer safe to obey the remaining formatting 877 * arguments as the arguments will no longer match 878 * the format specs. 879 */ 880 stop = 1; 881 break; 882 } 883 } 884 done: 885 /* 886 * Cleanup reentrancy issues. 887 */ 888 if (func == kputchar) 889 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF); 890 if (usespin) { 891 spin_unlock(&cons_spin); 892 crit_exit_hard(); 893 } 894 return (retval); 895 } 896 897 #undef PCHAR 898 899 /* 900 * Called from the panic code to try to get the console working 901 * again in case we paniced inside a kprintf(). 902 */ 903 void 904 kvcreinitspin(void) 905 { 906 spin_init(&cons_spin, "kvcre"); 907 atomic_clear_long(&mycpu->gd_flags, GDF_KPRINTF); 908 } 909 910 /* 911 * Console support thread for constty intercepts. This is needed because 912 * console tty intercepts can block. Instead of having kputchar() attempt 913 * to directly write to the console intercept we just force it to log 914 * and wakeup this baby to track and dump the log to constty. 915 */ 916 static void 917 constty_daemon(void) 918 { 919 u_int rindex; 920 u_int xindex; 921 u_int n; 922 struct msgbuf *mbp; 923 struct tty *tp; 924 925 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, 926 constty_td, SHUTDOWN_PRI_FIRST); 927 constty_td->td_flags |= TDF_SYSTHREAD; 928 929 mbp = msgbufp; 930 rindex = mbp->msg_bufr; /* persistent loop variable */ 931 xindex = mbp->msg_bufx - 1; /* anything different than bufx */ 932 cpu_ccfence(); 933 934 for (;;) { 935 kproc_suspend_loop(); 936 937 crit_enter(); 938 if (mbp != msgbufp) 939 mbp = msgbufp; 940 if (xindex == mbp->msg_bufx || 941 mbp == NULL || 942 msgbufmapped == 0) { 943 tsleep(constty_td, 0, "waiting", hz*60); 944 crit_exit(); 945 continue; 946 } 947 crit_exit(); 948 949 /* 950 * Get message buf FIFO indices. rindex is tracking. 951 */ 952 xindex = mbp->msg_bufx; 953 cpu_ccfence(); 954 if ((tp = constty) == NULL) { 955 rindex = xindex; 956 continue; 957 } 958 959 /* 960 * Check if the calculated bytes has rolled the whole 961 * message buffer. 962 */ 963 n = xindex - rindex; 964 if (n > mbp->msg_size - 1024) { 965 rindex = xindex - mbp->msg_size + 2048; 966 n = xindex - rindex; 967 } 968 969 /* 970 * And dump it. If constty gets stuck will give up. 971 */ 972 while (rindex != xindex) { 973 u_int ri = rindex % mbp->msg_size; 974 if (tputchar((uint8_t)mbp->msg_ptr[ri], tp) < 0) { 975 constty = NULL; 976 rindex = xindex; 977 break; 978 } 979 if (tp->t_outq.c_cc >= tp->t_ohiwat) { 980 tsleep(constty_daemon, 0, "blocked", hz / 10); 981 if (tp->t_outq.c_cc >= tp->t_ohiwat) { 982 rindex = xindex; 983 break; 984 } 985 } 986 ++rindex; 987 } 988 } 989 } 990 991 static struct kproc_desc constty_kp = { 992 "consttyd", 993 constty_daemon, 994 &constty_td 995 }; 996 SYSINIT(bufdaemon, SI_SUB_KTHREAD_UPDATE, SI_ORDER_ANY, 997 kproc_start, &constty_kp); 998 999 /* 1000 * Put character in log buffer with a particular priority. 1001 * 1002 * MPSAFE 1003 */ 1004 static void 1005 msglogchar(int c, int pri) 1006 { 1007 static int lastpri = -1; 1008 static int dangling; 1009 char nbuf[MAXNBUF]; 1010 char *p; 1011 1012 if (!msgbufmapped) 1013 return; 1014 if (c == '\0' || c == '\r') 1015 return; 1016 if (pri != -1 && pri != lastpri) { 1017 if (dangling) { 1018 msgaddchar('\n', NULL); 1019 dangling = 0; 1020 } 1021 msgaddchar('<', NULL); 1022 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 1023 msgaddchar(*p--, NULL); 1024 msgaddchar('>', NULL); 1025 lastpri = pri; 1026 } 1027 msgaddchar(c, NULL); 1028 if (c == '\n') { 1029 dangling = 0; 1030 lastpri = -1; 1031 } else { 1032 dangling = 1; 1033 } 1034 } 1035 1036 /* 1037 * Put char in log buffer. Make sure nothing blows up beyond repair if 1038 * we have an MP race. 1039 * 1040 * MPSAFE. 1041 */ 1042 static void 1043 msgaddchar(int c, void *dummy) 1044 { 1045 struct msgbuf *mbp; 1046 u_int lindex; 1047 u_int rindex; 1048 u_int xindex; 1049 u_int n; 1050 1051 if (!msgbufmapped) 1052 return; 1053 mbp = msgbufp; 1054 lindex = mbp->msg_bufl; 1055 rindex = mbp->msg_bufr; 1056 xindex = mbp->msg_bufx++; /* Allow SMP race */ 1057 cpu_ccfence(); 1058 1059 mbp->msg_ptr[xindex % mbp->msg_size] = c; 1060 n = xindex - lindex; 1061 if (n > mbp->msg_size - 1024) { 1062 lindex = xindex - mbp->msg_size + 2048; 1063 cpu_ccfence(); 1064 mbp->msg_bufl = lindex; 1065 } 1066 n = xindex - rindex; 1067 if (n > mbp->msg_size - 1024) { 1068 rindex = xindex - mbp->msg_size + 2048; 1069 cpu_ccfence(); 1070 mbp->msg_bufr = rindex; 1071 } 1072 } 1073 1074 static void 1075 msgbufcopy(struct msgbuf *oldp) 1076 { 1077 u_int rindex; 1078 u_int xindex; 1079 u_int n; 1080 1081 rindex = oldp->msg_bufr; 1082 xindex = oldp->msg_bufx; 1083 cpu_ccfence(); 1084 1085 n = xindex - rindex; 1086 if (n > oldp->msg_size - 1024) 1087 rindex = xindex - oldp->msg_size + 2048; 1088 while (rindex != xindex) { 1089 msglogchar(oldp->msg_ptr[rindex % oldp->msg_size], -1); 1090 ++rindex; 1091 } 1092 } 1093 1094 void 1095 msgbufinit(void *ptr, size_t size) 1096 { 1097 char *cp; 1098 static struct msgbuf *oldp = NULL; 1099 1100 size -= sizeof(*msgbufp); 1101 cp = (char *)ptr; 1102 msgbufp = (struct msgbuf *) (cp + size); 1103 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size) { 1104 bzero(cp, size); 1105 bzero(msgbufp, sizeof(*msgbufp)); 1106 msgbufp->msg_magic = MSG_MAGIC; 1107 msgbufp->msg_size = (char *)msgbufp - cp; 1108 } 1109 msgbufp->msg_ptr = cp; 1110 if (msgbufmapped && oldp != msgbufp) 1111 msgbufcopy(oldp); 1112 cpu_mfence(); 1113 msgbufmapped = 1; 1114 oldp = msgbufp; 1115 } 1116 1117 /* Sysctls for accessing/clearing the msgbuf */ 1118 1119 static int 1120 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 1121 { 1122 struct msgbuf *mbp; 1123 struct ucred *cred; 1124 int error; 1125 u_int rindex_modulo; 1126 u_int xindex_modulo; 1127 u_int rindex; 1128 u_int xindex; 1129 u_int n; 1130 1131 /* 1132 * Only wheel or root can access the message log. 1133 */ 1134 if (unprivileged_read_msgbuf == 0) { 1135 KKASSERT(req->td->td_proc); 1136 cred = req->td->td_proc->p_ucred; 1137 1138 if ((cred->cr_prison || groupmember(0, cred) == 0) && 1139 priv_check(req->td, PRIV_ROOT) != 0 1140 ) { 1141 return (EPERM); 1142 } 1143 } 1144 1145 /* 1146 * Unwind the buffer, so that it's linear (possibly starting with 1147 * some initial nulls). 1148 * 1149 * We don't push the entire buffer like we did before because 1150 * bufr (and bufl) now advance in chunks when the fifo is full, 1151 * rather than one character. 1152 */ 1153 mbp = msgbufp; 1154 rindex = mbp->msg_bufr; 1155 xindex = mbp->msg_bufx; 1156 n = xindex - rindex; 1157 if (n > mbp->msg_size - 1024) { 1158 rindex = xindex - mbp->msg_size + 2048; 1159 n = xindex - rindex; 1160 } 1161 rindex_modulo = rindex % mbp->msg_size; 1162 xindex_modulo = xindex % mbp->msg_size; 1163 1164 if (rindex_modulo < xindex_modulo) { 1165 /* 1166 * Can handle in one linear section. 1167 */ 1168 error = sysctl_handle_opaque(oidp, 1169 mbp->msg_ptr + rindex_modulo, 1170 xindex_modulo - rindex_modulo, 1171 req); 1172 } else if (rindex_modulo == xindex_modulo) { 1173 /* 1174 * Empty buffer, just return a single newline 1175 */ 1176 error = sysctl_handle_opaque(oidp, "\n", 1, req); 1177 } else if (n <= mbp->msg_size - rindex_modulo) { 1178 /* 1179 * Can handle in one linear section. 1180 */ 1181 error = sysctl_handle_opaque(oidp, 1182 mbp->msg_ptr + rindex_modulo, 1183 n - rindex_modulo, 1184 req); 1185 } else { 1186 /* 1187 * Glue together two linear sections into one contiguous 1188 * output. 1189 */ 1190 error = sysctl_handle_opaque(oidp, 1191 mbp->msg_ptr + rindex_modulo, 1192 mbp->msg_size - rindex_modulo, 1193 req); 1194 n -= mbp->msg_size - rindex_modulo; 1195 if (error == 0) 1196 error = sysctl_handle_opaque(oidp, mbp->msg_ptr, 1197 n, req); 1198 } 1199 return (error); 1200 } 1201 1202 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 1203 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 1204 1205 static int msgbuf_clear; 1206 1207 static int 1208 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 1209 { 1210 int error; 1211 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 1212 if (!error && req->newptr) { 1213 /* Clear the buffer and reset write pointer */ 1214 msgbufp->msg_bufr = msgbufp->msg_bufx; 1215 msgbufp->msg_bufl = msgbufp->msg_bufx; 1216 bzero(msgbufp->msg_ptr, msgbufp->msg_size); 1217 msgbuf_clear = 0; 1218 } 1219 return (error); 1220 } 1221 1222 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 1223 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0, 1224 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 1225 1226 #ifdef DDB 1227 1228 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 1229 { 1230 u_int rindex; 1231 u_int i; 1232 u_int j; 1233 1234 if (!msgbufmapped) { 1235 db_printf("msgbuf not mapped yet\n"); 1236 return; 1237 } 1238 db_printf("msgbufp = %p\n", msgbufp); 1239 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", 1240 msgbufp->msg_magic, msgbufp->msg_size, 1241 msgbufp->msg_bufr % msgbufp->msg_size, 1242 msgbufp->msg_bufx % msgbufp->msg_size, 1243 msgbufp->msg_ptr); 1244 1245 rindex = msgbufp->msg_bufr; 1246 for (i = 0; i < msgbufp->msg_size; i++) { 1247 j = (i + rindex) % msgbufp->msg_size; 1248 db_printf("%c", msgbufp->msg_ptr[j]); 1249 } 1250 db_printf("\n"); 1251 } 1252 1253 #endif /* DDB */ 1254 1255 1256 void 1257 hexdump(const void *ptr, int length, const char *hdr, int flags) 1258 { 1259 int i, j, k; 1260 int cols; 1261 const unsigned char *cp; 1262 char delim; 1263 1264 if ((flags & HD_DELIM_MASK) != 0) 1265 delim = (flags & HD_DELIM_MASK) >> 8; 1266 else 1267 delim = ' '; 1268 1269 if ((flags & HD_COLUMN_MASK) != 0) 1270 cols = flags & HD_COLUMN_MASK; 1271 else 1272 cols = 16; 1273 1274 cp = ptr; 1275 for (i = 0; i < length; i+= cols) { 1276 if (hdr != NULL) 1277 kprintf("%s", hdr); 1278 1279 if ((flags & HD_OMIT_COUNT) == 0) 1280 kprintf("%04x ", i); 1281 1282 if ((flags & HD_OMIT_HEX) == 0) { 1283 for (j = 0; j < cols; j++) { 1284 k = i + j; 1285 if (k < length) 1286 kprintf("%c%02x", delim, cp[k]); 1287 else 1288 kprintf(" "); 1289 } 1290 } 1291 1292 if ((flags & HD_OMIT_CHARS) == 0) { 1293 kprintf(" |"); 1294 for (j = 0; j < cols; j++) { 1295 k = i + j; 1296 if (k >= length) 1297 kprintf(" "); 1298 else if (cp[k] >= ' ' && cp[k] <= '~') 1299 kprintf("%c", cp[k]); 1300 else 1301 kprintf("."); 1302 } 1303 kprintf("|"); 1304 } 1305 kprintf("\n"); 1306 } 1307 } 1308 1309 void 1310 kprint_cpuset(cpumask_t *mask) 1311 { 1312 int i; 1313 int b = -1; 1314 int e = -1; 1315 int more = 0; 1316 1317 kprintf("cpus("); 1318 CPUSET_FOREACH(i, *mask) { 1319 if (b < 0) { 1320 b = i; 1321 e = b + 1; 1322 continue; 1323 } 1324 if (e == i) { 1325 ++e; 1326 continue; 1327 } 1328 if (more) 1329 kprintf(", "); 1330 if (b == e - 1) { 1331 kprintf("%d", b); 1332 } else { 1333 kprintf("%d-%d", b, e - 1); 1334 } 1335 more = 1; 1336 b = i; 1337 e = b + 1; 1338 } 1339 if (more) 1340 kprintf(", "); 1341 if (b >= 0) { 1342 if (b == e - 1) { 1343 kprintf("%d", b); 1344 } else { 1345 kprintf("%d-%d", b, e - 1); 1346 } 1347 } 1348 kprintf(") "); 1349 } 1350