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, "Duplicate console output to the syslog"); 116 static int kprintf_logging = TOLOG | TOCONS; 117 TUNABLE_INT("kern.kprintf_logging", &kprintf_logging); 118 SYSCTL_INT(_kern, OID_AUTO, kprintf_logging, CTLFLAG_RW, 119 &kprintf_logging, 0, "kprintf() target bitmask: 0x1=console 0x4=dmesg"); 120 121 static int ptr_restrict = 0; 122 TUNABLE_INT("security.ptr_restrict", &ptr_restrict); 123 SYSCTL_INT(_security, OID_AUTO, ptr_restrict, CTLFLAG_RW, &ptr_restrict, 0, 124 "Prevent leaking the kernel pointers back to userland"); 125 126 static int unprivileged_read_msgbuf = 1; 127 TUNABLE_INT("security.unprivileged_read_msgbuf", &unprivileged_read_msgbuf); 128 SYSCTL_INT(_security, OID_AUTO, unprivileged_read_msgbuf, CTLFLAG_RW, 129 &unprivileged_read_msgbuf, 0, 130 "Unprivileged processes may read the kernel message buffer"); 131 132 /* 133 * Warn that a system table is full. 134 */ 135 void 136 tablefull(const char *tab) 137 { 138 139 log(LOG_ERR, "%s: table is full\n", tab); 140 } 141 142 /* 143 * Uprintf prints to the controlling terminal for the current process. 144 */ 145 int 146 uprintf(const char *fmt, ...) 147 { 148 struct proc *p = curproc; 149 __va_list ap; 150 struct putchar_arg pca; 151 int retval = 0; 152 153 if (p && (p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 154 __va_start(ap, fmt); 155 pca.tty = p->p_session->s_ttyp; 156 pca.flags = TOTTY; 157 158 retval = kvcprintf(fmt, kputchar, &pca, ap); 159 __va_end(ap); 160 } 161 return (retval); 162 } 163 164 tpr_t 165 tprintf_open(struct proc *p) 166 { 167 if ((p->p_flags & P_CONTROLT) && p->p_session->s_ttyvp) { 168 sess_hold(p->p_session); 169 return ((tpr_t) p->p_session); 170 } 171 return (NULL); 172 } 173 174 void 175 tprintf_close(tpr_t sess) 176 { 177 if (sess) 178 sess_rele((struct session *) sess); 179 } 180 181 /* 182 * tprintf prints on the controlling terminal associated 183 * with the given session. 184 */ 185 int 186 tprintf(tpr_t tpr, const char *fmt, ...) 187 { 188 struct session *sess = (struct session *)tpr; 189 struct tty *tp = NULL; 190 int flags = TOLOG; 191 __va_list ap; 192 struct putchar_arg pca; 193 int retval; 194 195 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 196 flags |= TOTTY; 197 tp = sess->s_ttyp; 198 } 199 __va_start(ap, fmt); 200 pca.tty = tp; 201 pca.flags = flags; 202 pca.pri = LOG_INFO; 203 retval = kvcprintf(fmt, kputchar, &pca, ap); 204 __va_end(ap); 205 msgbuftrigger = 1; 206 return (retval); 207 } 208 209 /* 210 * Ttyprintf displays a message on a tty; it should be used only by 211 * the tty driver, or anything that knows the underlying tty will not 212 * be revoke(2)'d away. Other callers should use tprintf. 213 */ 214 int 215 ttyprintf(struct tty *tp, const char *fmt, ...) 216 { 217 __va_list ap; 218 struct putchar_arg pca; 219 int retval; 220 221 __va_start(ap, fmt); 222 pca.tty = tp; 223 pca.flags = TOTTY; 224 retval = kvcprintf(fmt, kputchar, &pca, ap); 225 __va_end(ap); 226 return (retval); 227 } 228 229 /* 230 * Log writes to the log buffer, and guarantees not to sleep (so can be 231 * called by interrupt routines). If there is no process reading the 232 * log yet, it writes to the console also. 233 */ 234 int 235 log(int level, const char *fmt, ...) 236 { 237 __va_list ap; 238 int retval; 239 struct putchar_arg pca; 240 241 pca.tty = NULL; 242 pca.pri = level; 243 if ((kprintf_logging & TOCONS) == 0 || log_open) 244 pca.flags = TOLOG; 245 else 246 pca.flags = TOCONS; 247 248 __va_start(ap, fmt); 249 retval = kvcprintf(fmt, kputchar, &pca, ap); 250 __va_end(ap); 251 252 msgbuftrigger = 1; 253 return (retval); 254 } 255 256 #define CONSCHUNK 128 257 258 void 259 log_console(struct uio *uio) 260 { 261 int c, i, error, iovlen, nl; 262 struct uio muio; 263 struct iovec *miov = NULL; 264 char *consbuffer; 265 int pri; 266 267 if (!log_console_output) 268 return; 269 270 pri = LOG_INFO | LOG_CONSOLE; 271 muio = *uio; 272 iovlen = uio->uio_iovcnt * sizeof (struct iovec); 273 miov = kmalloc(iovlen, M_TEMP, M_WAITOK); 274 consbuffer = kmalloc(CONSCHUNK, M_TEMP, M_WAITOK); 275 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen); 276 muio.uio_iov = miov; 277 uio = &muio; 278 279 nl = 0; 280 while (uio->uio_resid > 0) { 281 c = (int)szmin(uio->uio_resid, CONSCHUNK); 282 error = uiomove(consbuffer, (size_t)c, uio); 283 if (error != 0) 284 break; 285 for (i = 0; i < c; i++) { 286 msglogchar(consbuffer[i], pri); 287 if (consbuffer[i] == '\n') 288 nl = 1; 289 else 290 nl = 0; 291 } 292 } 293 if (!nl) 294 msglogchar('\n', pri); 295 msgbuftrigger = 1; 296 kfree(miov, M_TEMP); 297 kfree(consbuffer, M_TEMP); 298 return; 299 } 300 301 /* 302 * Output to the console. 303 */ 304 int 305 kprintf(const char *fmt, ...) 306 { 307 __va_list ap; 308 int savintr; 309 struct putchar_arg pca; 310 int retval; 311 312 savintr = consintr; /* disable interrupts */ 313 consintr = 0; 314 __va_start(ap, fmt); 315 pca.tty = NULL; 316 pca.flags = kprintf_logging & ~TOTTY; 317 pca.pri = -1; 318 retval = kvcprintf(fmt, kputchar, &pca, ap); 319 __va_end(ap); 320 if (!panicstr) 321 msgbuftrigger = 1; 322 consintr = savintr; /* reenable interrupts */ 323 return (retval); 324 } 325 326 int 327 kvprintf(const char *fmt, __va_list ap) 328 { 329 int savintr; 330 struct putchar_arg pca; 331 int retval; 332 333 savintr = consintr; /* disable interrupts */ 334 consintr = 0; 335 pca.tty = NULL; 336 pca.flags = kprintf_logging & ~TOTTY; 337 pca.pri = -1; 338 retval = kvcprintf(fmt, kputchar, &pca, ap); 339 if (!panicstr) 340 msgbuftrigger = 1; 341 consintr = savintr; /* reenable interrupts */ 342 return (retval); 343 } 344 345 /* 346 * Limited rate kprintf. The passed rate structure must be initialized 347 * with the desired reporting frequency. A frequency of 0 will result in 348 * no output. 349 * 350 * count may be initialized to a negative number to allow an initial 351 * burst. 352 * 353 * Returns 0 if it did not issue the printf, non-zero if it did. 354 */ 355 int 356 krateprintf(struct krate *rate, const char *fmt, ...) 357 { 358 __va_list ap; 359 int res; 360 361 if (rate->ticks != (int)time_uptime) { 362 rate->ticks = (int)time_uptime; 363 if (rate->count > 0) 364 rate->count = 0; 365 } 366 if (rate->count < rate->freq) { 367 ++rate->count; 368 __va_start(ap, fmt); 369 kvprintf(fmt, ap); 370 __va_end(ap); 371 res = 1; 372 } else { 373 res = 0; 374 } 375 return res; 376 } 377 378 /* 379 * Print a character to the dmesg log, the console, and/or the user's 380 * terminal. 381 * 382 * NOTE: TOTTY does not require nonblocking operation, but TOCONS 383 * and TOLOG do. When we have a constty we still output to 384 * the real console but we have a monitoring thread which 385 * we wakeup which tracks the log. 386 */ 387 static void 388 kputchar(int c, void *arg) 389 { 390 struct putchar_arg *ap = (struct putchar_arg*) arg; 391 int flags = ap->flags; 392 struct tty *tp = ap->tty; 393 394 if (panicstr) 395 constty = NULL; 396 if ((flags & TOCONS) && tp == NULL && constty) 397 flags |= TOLOG | TOWAKEUP; 398 if ((flags & TOTTY) && tputchar(c, tp) < 0) 399 ap->flags &= ~TOTTY; 400 if ((flags & TOLOG)) 401 msglogchar(c, ap->pri); 402 if ((flags & TOCONS) && c) 403 cnputc(c); 404 if ((flags & TOWAKEUP) && mycpu->gd_intr_nesting_level == 0) 405 wakeup(constty_td); 406 } 407 408 /* 409 * Scaled down version of sprintf(3). 410 */ 411 int 412 ksprintf(char *buf, const char *cfmt, ...) 413 { 414 int retval; 415 __va_list ap; 416 417 __va_start(ap, cfmt); 418 retval = kvcprintf(cfmt, NULL, buf, ap); 419 buf[retval] = '\0'; 420 __va_end(ap); 421 return (retval); 422 } 423 424 /* 425 * Scaled down version of vsprintf(3). 426 */ 427 int 428 kvsprintf(char *buf, const char *cfmt, __va_list ap) 429 { 430 int retval; 431 432 retval = kvcprintf(cfmt, NULL, buf, ap); 433 buf[retval] = '\0'; 434 return (retval); 435 } 436 437 /* 438 * Scaled down version of snprintf(3). 439 */ 440 int 441 ksnprintf(char *str, size_t size, const char *format, ...) 442 { 443 int retval; 444 __va_list ap; 445 446 __va_start(ap, format); 447 retval = kvsnprintf(str, size, format, ap); 448 __va_end(ap); 449 return(retval); 450 } 451 452 /* 453 * Scaled down version of vsnprintf(3). 454 */ 455 int 456 kvsnprintf(char *str, size_t size, const char *format, __va_list ap) 457 { 458 struct snprintf_arg info; 459 int retval; 460 461 info.str = str; 462 info.remain = size; 463 retval = kvcprintf(format, snprintf_func, &info, ap); 464 if (info.remain >= 1) 465 *info.str++ = '\0'; 466 return (retval); 467 } 468 469 int 470 kvasnprintf(char **strp, size_t size, const char *format, __va_list ap) 471 { 472 struct snprintf_arg info; 473 int retval; 474 475 *strp = kmalloc(size, M_TEMP, M_WAITOK); 476 info.str = *strp; 477 info.remain = size; 478 retval = kvcprintf(format, snprintf_func, &info, ap); 479 if (info.remain >= 1) 480 *info.str++ = '\0'; 481 return (retval); 482 } 483 484 void 485 kvasfree(char **strp) 486 { 487 if (*strp) { 488 kfree(*strp, M_TEMP); 489 *strp = NULL; 490 } 491 } 492 493 static void 494 snprintf_func(int ch, void *arg) 495 { 496 struct snprintf_arg *const info = arg; 497 498 if (info->remain >= 2) { 499 *info->str++ = ch; 500 info->remain--; 501 } 502 } 503 504 /* 505 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 506 * order; return an optional length and a pointer to the last character 507 * written in the buffer (i.e., the first character of the string). 508 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 509 */ 510 static char * 511 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 512 { 513 char *p, c; 514 515 p = nbuf; 516 *p = '\0'; 517 do { 518 c = hex2ascii(num % base); 519 *++p = upper ? toupper(c) : c; 520 } while (num /= base); 521 if (lenp) 522 *lenp = p - nbuf; 523 return (p); 524 } 525 526 /* 527 * Scaled down version of printf(3). 528 * 529 * Two additional formats: 530 * 531 * The format %pb%i is supported to decode error registers. 532 * Its usage is: 533 * 534 * kprintf("reg=%pb%i\n", "<base><arg>*", regval); 535 * 536 * where <base> is the output base expressed as a control character, e.g. 537 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 538 * the first of which gives the bit number to be inspected (origin 1), and 539 * the next characters (up to a control character, i.e. a character <= 32), 540 * give the name of the register. Thus: 541 * 542 * kvcprintf("reg=%pb%i\n", "\10\2BITTWO\1BITONE\n", 3); 543 * 544 * would produce output: 545 * 546 * reg=3<BITTWO,BITONE> 547 */ 548 549 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;} 550 551 int 552 kvcprintf(char const *fmt, void (*func)(int, void*), void *arg, __va_list ap) 553 { 554 char nbuf[MAXNBUF]; 555 char *d; 556 const char *p, *percent, *q; 557 int ch, n; 558 uintmax_t num; 559 int base, tmp, width, ladjust, sharpflag, spaceflag, neg, sign, dot; 560 int cflag, hflag, jflag, lflag, qflag, tflag, zflag; 561 int dwidth, upper; 562 char padc; 563 int retval = 0, stop = 0; 564 int usespin; 565 int ddb_active; 566 567 #ifdef DDB 568 ddb_active = db_active; 569 #else 570 ddb_active = 0; 571 #endif 572 573 num = 0; 574 if (!func) 575 d = (char *) arg; 576 else 577 d = NULL; 578 579 if (fmt == NULL) 580 fmt = "(fmt null)\n"; 581 582 /* 583 * For kputchar just straight-out don't spin, even if it means losing 584 * output from several cpu's posting at the same time. This allows 585 * us to call debugging / warning kprintf()s from the likes of 586 * the Xinvltlb hard interrupt which ignore critical sections. 587 * 588 * This also avoids deadlocking on nested kprintf()s. 589 */ 590 usespin = (func == kputchar && 591 (kprintf_logging & TONOSPIN) == 0 && 592 panic_cpu_gd != mycpu && 593 (((struct putchar_arg *)arg)->flags & TOTTY) == 0); 594 if (usespin) { 595 crit_enter_hard(); 596 if (spin_trylock(&cons_spin) == 0) { 597 goto headoncrash; /* failed */ 598 } 599 } 600 601 for (;;) { 602 padc = ' '; 603 width = 0; 604 while ((ch = (u_char)*fmt++) != '%' || stop) { 605 if (ch == '\0') 606 goto done; 607 PCHAR(ch); 608 } 609 percent = fmt - 1; 610 dot = dwidth = ladjust = neg = sharpflag = sign = upper = 0; 611 spaceflag = 0; 612 cflag = hflag = jflag = lflag = qflag = tflag = zflag = 0; 613 614 reswitch: 615 switch (ch = (u_char)*fmt++) { 616 case ' ': 617 spaceflag = 1; 618 goto reswitch; 619 case '.': 620 dot = 1; 621 goto reswitch; 622 case '#': 623 sharpflag = 1; 624 goto reswitch; 625 case '+': 626 sign = 1; 627 goto reswitch; 628 case '-': 629 ladjust = 1; 630 goto reswitch; 631 case '%': 632 PCHAR(ch); 633 break; 634 case '*': 635 if (!dot) { 636 width = __va_arg(ap, int); 637 if (width < 0) { 638 ladjust = !ladjust; 639 width = -width; 640 } 641 } else { 642 dwidth = __va_arg(ap, int); 643 } 644 goto reswitch; 645 case '0': 646 if (!dot) { 647 padc = '0'; 648 goto reswitch; 649 } 650 case '1': case '2': case '3': case '4': 651 case '5': case '6': case '7': case '8': case '9': 652 for (n = 0;; ++fmt) { 653 n = n * 10 + ch - '0'; 654 ch = *fmt; 655 if (ch < '0' || ch > '9') 656 break; 657 } 658 if (dot) 659 dwidth = n; 660 else 661 width = n; 662 goto reswitch; 663 case 'c': 664 PCHAR(__va_arg(ap, int)); 665 break; 666 case 'd': 667 case 'i': 668 base = 10; 669 sign = 1; 670 goto handle_sign; 671 case 'h': 672 if (hflag) { 673 hflag = 0; 674 cflag = 1; 675 } else 676 hflag = 1; 677 goto reswitch; 678 case 'j': 679 jflag = 1; 680 goto reswitch; 681 case 'l': 682 if (lflag) { 683 lflag = 0; 684 qflag = 1; 685 } else 686 lflag = 1; 687 goto reswitch; 688 case 'n': 689 if (cflag) 690 *(__va_arg(ap, char *)) = retval; 691 else if (hflag) 692 *(__va_arg(ap, short *)) = retval; 693 else if (jflag) 694 *(__va_arg(ap, intmax_t *)) = retval; 695 else if (lflag) 696 *(__va_arg(ap, long *)) = retval; 697 else if (qflag) 698 *(__va_arg(ap, quad_t *)) = retval; 699 else 700 *(__va_arg(ap, int *)) = retval; 701 break; 702 case 'o': 703 base = 8; 704 goto handle_nosign; 705 case 'p': 706 /* peek if this is a /b/ hiding as /p/ or not */ 707 if (fmt[0] == 'b' && fmt[1] == '%' && fmt[2] == 'i') { 708 fmt += 3; /* consume "b%i" */ 709 p = __va_arg(ap, char *); 710 num = (u_int)__va_arg(ap, int); 711 for (q = ksprintn(nbuf, num, *p++, NULL, 0);*q;) 712 PCHAR(*q--); 713 714 if (num == 0) 715 break; 716 717 for (tmp = 0; *p;) { 718 n = *p++; 719 if (num & (1 << (n - 1))) { 720 PCHAR(tmp ? ',' : '<'); 721 for (; (n = *p) > ' '; ++p) 722 PCHAR(n); 723 tmp = 1; 724 } else { 725 for (; *p > ' '; ++p) 726 continue; 727 } 728 } 729 if (tmp) 730 PCHAR('>'); 731 break; 732 } 733 base = 16; 734 sharpflag = (width == 0); 735 sign = 0; 736 num = (uintptr_t)__va_arg(ap, void *); 737 if (ptr_restrict && fmt[0] != 'x' && 738 !(panicstr || dumping || ddb_active)) { 739 if (ptr_restrict == 1) { 740 /* zero out upper bits */ 741 num &= 0xffffffUL; 742 } else { 743 num = 0xc0ffee; 744 } 745 } 746 goto number; 747 case 'q': 748 qflag = 1; 749 goto reswitch; 750 case 's': 751 p = __va_arg(ap, char *); 752 if (p == NULL) 753 p = "(null)"; 754 if (!dot) 755 n = strlen (p); 756 else 757 for (n = 0; n < dwidth && p[n]; n++) 758 continue; 759 760 width -= n; 761 762 if (!ladjust && width > 0) 763 while (width--) 764 PCHAR(padc); 765 while (n--) 766 PCHAR(*p++); 767 if (ladjust && width > 0) 768 while (width--) 769 PCHAR(padc); 770 break; 771 case 't': 772 tflag = 1; 773 goto reswitch; 774 case 'u': 775 base = 10; 776 goto handle_nosign; 777 case 'X': 778 upper = 1; 779 /* FALLTHROUGH */ 780 case 'x': 781 base = 16; 782 goto handle_nosign; 783 case 'z': 784 zflag = 1; 785 goto reswitch; 786 handle_nosign: 787 sign = 0; 788 if (cflag) 789 num = (u_char)__va_arg(ap, int); 790 else if (hflag) 791 num = (u_short)__va_arg(ap, int); 792 else if (jflag) 793 num = __va_arg(ap, uintmax_t); 794 else if (lflag) 795 num = __va_arg(ap, u_long); 796 else if (qflag) 797 num = __va_arg(ap, u_quad_t); 798 else if (tflag) 799 num = __va_arg(ap, ptrdiff_t); 800 else if (zflag) 801 num = __va_arg(ap, size_t); 802 else 803 num = __va_arg(ap, u_int); 804 goto number; 805 handle_sign: 806 if (cflag) 807 num = (char)__va_arg(ap, int); 808 else if (hflag) 809 num = (short)__va_arg(ap, int); 810 else if (jflag) 811 num = __va_arg(ap, intmax_t); 812 else if (lflag) 813 num = __va_arg(ap, long); 814 else if (qflag) 815 num = __va_arg(ap, quad_t); 816 else if (tflag) 817 num = __va_arg(ap, ptrdiff_t); 818 else if (zflag) 819 num = __va_arg(ap, ssize_t); 820 else 821 num = __va_arg(ap, int); 822 number: 823 if (sign && (intmax_t)num < 0) { 824 neg = 1; 825 num = -(intmax_t)num; 826 } 827 p = ksprintn(nbuf, num, base, &n, upper); 828 tmp = 0; 829 if (sharpflag && num != 0) { 830 if (base == 8) 831 tmp++; 832 else if (base == 16) 833 tmp += 2; 834 } 835 if (neg || (sign && spaceflag)) 836 tmp++; 837 838 if (!ladjust && padc == '0') 839 dwidth = width - tmp; 840 width -= tmp + imax(dwidth, n); 841 dwidth -= n; 842 if (!ladjust) 843 while (width-- > 0) 844 PCHAR(' '); 845 if (neg) { 846 PCHAR('-'); 847 } else if (sign && spaceflag) { 848 PCHAR(' '); 849 } 850 if (sharpflag && num != 0) { 851 if (base == 8) { 852 PCHAR('0'); 853 } else if (base == 16) { 854 PCHAR('0'); 855 PCHAR('x'); 856 } 857 } 858 while (dwidth-- > 0) 859 PCHAR('0'); 860 861 while (*p) 862 PCHAR(*p--); 863 864 if (ladjust) 865 while (width-- > 0) 866 PCHAR(' '); 867 868 break; 869 default: 870 while (percent < fmt) 871 PCHAR(*percent++); 872 /* 873 * Since we ignore an formatting argument it is no 874 * longer safe to obey the remaining formatting 875 * arguments as the arguments will no longer match 876 * the format specs. 877 */ 878 stop = 1; 879 break; 880 } 881 } 882 done: 883 /* 884 * Cleanup reentrancy issues. 885 */ 886 if (usespin) { 887 spin_unlock(&cons_spin); 888 headoncrash: 889 crit_exit_hard(); 890 } 891 return (retval); 892 } 893 894 #undef PCHAR 895 896 /* 897 * Called from the panic code to try to get the console working 898 * again in case we paniced inside a kprintf(). 899 */ 900 void 901 kvcreinitspin(void) 902 { 903 spin_init(&cons_spin, "kvcre"); 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); 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, HARD INTERRUPT SAFE, NESTING SAFE 999 * CRITICAL SECTIONS MIGHT BE IGNORED! MUST NOT USE NORMAL 1000 * SPIN_LOCK MECHANISMS. 1001 */ 1002 static void 1003 msglogchar(int c, int pri) 1004 { 1005 static int lastpri = -1; 1006 static int dangling; 1007 char nbuf[MAXNBUF]; 1008 char *p; 1009 1010 if (!msgbufmapped) 1011 return; 1012 if (c == '\0' || c == '\r') 1013 return; 1014 if (pri != -1 && pri != lastpri) { 1015 if (dangling) { 1016 msgaddchar('\n', NULL); 1017 dangling = 0; 1018 } 1019 msgaddchar('<', NULL); 1020 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 1021 msgaddchar(*p--, NULL); 1022 msgaddchar('>', NULL); 1023 lastpri = pri; 1024 } 1025 msgaddchar(c, NULL); 1026 if (c == '\n') { 1027 dangling = 0; 1028 lastpri = -1; 1029 } else { 1030 dangling = 1; 1031 } 1032 } 1033 1034 /* 1035 * Put char in log buffer. Make sure nothing blows up beyond repair if 1036 * we have an MP race. 1037 * 1038 * MPSAFE, HARD INTERRUPT SAFE, NESTING SAFE 1039 * CRITICAL SECTIONS MIGHT BE IGNORED! MUST NOT USE NORMAL 1040 * SPIN_LOCK MECHANISMS. 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