subr_prf.c revision 1.128
1 /* $NetBSD: subr_prf.c,v 1.128 2009/01/02 11:08:32 pooka Exp $ */ 2 3 /*- 4 * Copyright (c) 1986, 1988, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)subr_prf.c 8.4 (Berkeley) 5/4/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.128 2009/01/02 11:08:32 pooka Exp $"); 41 42 #include "opt_ddb.h" 43 #include "opt_ipkdb.h" 44 #include "opt_kgdb.h" 45 #include "opt_dump.h" 46 47 #include <sys/param.h> 48 #include <sys/stdint.h> 49 #include <sys/systm.h> 50 #include <sys/buf.h> 51 #include <sys/device.h> 52 #include <sys/reboot.h> 53 #include <sys/msgbuf.h> 54 #include <sys/proc.h> 55 #include <sys/ioctl.h> 56 #include <sys/vnode.h> 57 #include <sys/file.h> 58 #include <sys/tty.h> 59 #include <sys/tprintf.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/kprintf.h> 63 #include <sys/atomic.h> 64 #include <sys/kernel.h> 65 #include <sys/cpu.h> 66 67 #include <dev/cons.h> 68 69 #include <net/if.h> 70 71 #ifdef DDB 72 #include <ddb/ddbvar.h> 73 #include <machine/db_machdep.h> 74 #include <ddb/db_command.h> 75 #include <ddb/db_interface.h> 76 #endif 77 78 #ifdef IPKDB 79 #include <ipkdb/ipkdb.h> 80 #endif 81 82 static kmutex_t kprintf_mtx; 83 static bool kprintf_inited = false; 84 85 /* 86 * note that stdarg.h and the ansi style va_start macro is used for both 87 * ansi and traditional c complers. 88 * XXX: this requires that stdarg.h define: va_alist and va_dcl 89 */ 90 #include <machine/stdarg.h> 91 92 93 #ifdef KGDB 94 #include <sys/kgdb.h> 95 #endif 96 #ifdef DDB 97 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 98 #endif 99 100 101 /* 102 * defines 103 */ 104 105 106 /* 107 * local prototypes 108 */ 109 110 static void putchar(int, int, struct tty *); 111 112 113 /* 114 * globals 115 */ 116 117 extern struct tty *constty; /* pointer to console "window" tty */ 118 extern int log_open; /* subr_log: is /dev/klog open? */ 119 const char *panicstr; /* arg to first call to panic (used as a flag 120 to indicate that panic has already been called). */ 121 struct cpu_info *paniccpu; /* cpu that first paniced */ 122 long panicstart, panicend; /* position in the msgbuf of the start and 123 end of the formatted panicstr. */ 124 int doing_shutdown; /* set to indicate shutdown in progress */ 125 126 #ifndef DUMP_ON_PANIC 127 #define DUMP_ON_PANIC 1 128 #endif 129 int dumponpanic = DUMP_ON_PANIC; 130 131 /* 132 * v_putc: routine to putc on virtual console 133 * 134 * the v_putc pointer can be used to redirect the console cnputc elsewhere 135 * [e.g. to a "virtual console"]. 136 */ 137 138 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 139 void (*v_flush)(void) = cnflush; /* start with cnflush (normal cons) */ 140 141 const char hexdigits[] = "0123456789abcdef"; 142 const char HEXDIGITS[] = "0123456789ABCDEF"; 143 144 145 /* 146 * functions 147 */ 148 149 /* 150 * Locking is inited fairly early in MI bootstrap. Before that 151 * prints are done unlocked. But that doesn't really matter, 152 * since nothing can preempt us before interrupts are enabled. 153 */ 154 void 155 kprintf_init() 156 { 157 158 KASSERT(!kprintf_inited && cold); /* not foolproof, but ... */ 159 mutex_init(&kprintf_mtx, MUTEX_DEFAULT, IPL_HIGH); 160 kprintf_inited = true; 161 } 162 163 void 164 kprintf_lock() 165 { 166 167 if (__predict_true(kprintf_inited)) 168 mutex_enter(&kprintf_mtx); 169 } 170 171 void 172 kprintf_unlock() 173 { 174 175 if (__predict_true(kprintf_inited)) { 176 /* assert kprintf wasn't somehow inited while we were in */ 177 KASSERT(mutex_owned(&kprintf_mtx)); 178 mutex_exit(&kprintf_mtx); 179 } 180 } 181 182 /* 183 * twiddle: spin a little propellor on the console. 184 */ 185 186 void 187 twiddle(void) 188 { 189 static const char twiddle_chars[] = "|/-\\"; 190 static int pos; 191 192 kprintf_lock(); 193 194 putchar(twiddle_chars[pos++ & 3], TOCONS, NULL); 195 putchar('\b', TOCONS, NULL); 196 197 kprintf_unlock(); 198 } 199 200 /* 201 * panic: handle an unresolvable fatal error 202 * 203 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 204 * call) we avoid trying to sync the disk and just reboot (to avoid 205 * recursive panics). 206 */ 207 208 void 209 panic(const char *fmt, ...) 210 { 211 CPU_INFO_ITERATOR cii; 212 struct cpu_info *ci, *oci; 213 int bootopt; 214 va_list ap; 215 216 /* 217 * Disable preemption. If already panicing on another CPU, sit 218 * here and spin until the system is rebooted. Allow the CPU that 219 * first paniced to panic again. 220 */ 221 kpreempt_disable(); 222 ci = curcpu(); 223 oci = atomic_cas_ptr((void *)&paniccpu, NULL, ci); 224 if (oci != NULL && oci != ci) { 225 /* Give interrupts a chance to try and prevent deadlock. */ 226 for (;;) { 227 DELAY(10); 228 } 229 } 230 231 /* 232 * Convert the current thread to a bound thread and prevent all 233 * CPUs from scheduling unbound jobs. Do so without taking any 234 * locks. 235 */ 236 curlwp->l_pflag |= LP_BOUND; 237 for (CPU_INFO_FOREACH(cii, ci)) { 238 ci->ci_schedstate.spc_flags |= SPCF_OFFLINE; 239 } 240 241 bootopt = RB_AUTOBOOT | RB_NOSYNC; 242 if (dumponpanic) 243 bootopt |= RB_DUMP; 244 if (!panicstr) 245 panicstr = fmt; 246 doing_shutdown = 1; 247 248 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 249 panicstart = msgbufp->msg_bufx; 250 251 va_start(ap, fmt); 252 printf("panic: "); 253 vprintf(fmt, ap); 254 printf("\n"); 255 va_end(ap); 256 257 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 258 panicend = msgbufp->msg_bufx; 259 260 #ifdef IPKDB 261 ipkdb_panic(); 262 #endif 263 #ifdef KGDB 264 kgdb_panic(); 265 #endif 266 #ifdef KADB 267 if (boothowto & RB_KDB) 268 kdbpanic(); 269 #endif 270 #ifdef DDB 271 if (db_onpanic == 1) 272 Debugger(); 273 else if (db_onpanic >= 0) { 274 static int intrace = 0; 275 276 if (intrace == 0) { 277 intrace = 1; 278 printf("Begin traceback...\n"); 279 db_stack_trace_print( 280 (db_expr_t)(intptr_t)__builtin_frame_address(0), 281 true, 65535, "", printf); 282 printf("End traceback...\n"); 283 intrace = 0; 284 } else 285 printf("Faulted in mid-traceback; aborting..."); 286 if (db_onpanic == 2) 287 Debugger(); 288 } 289 #endif 290 cpu_reboot(bootopt, NULL); 291 } 292 293 /* 294 * kernel logging functions: log, logpri, addlog 295 */ 296 297 /* 298 * log: write to the log buffer 299 * 300 * => will not sleep [so safe to call from interrupt] 301 * => will log to console if /dev/klog isn't open 302 */ 303 304 void 305 log(int level, const char *fmt, ...) 306 { 307 va_list ap; 308 309 kprintf_lock(); 310 311 klogpri(level); /* log the level first */ 312 va_start(ap, fmt); 313 kprintf(fmt, TOLOG, NULL, NULL, ap); 314 va_end(ap); 315 if (!log_open) { 316 va_start(ap, fmt); 317 kprintf(fmt, TOCONS, NULL, NULL, ap); 318 va_end(ap); 319 } 320 321 kprintf_unlock(); 322 323 logwakeup(); /* wake up anyone waiting for log msgs */ 324 } 325 326 /* 327 * vlog: write to the log buffer [already have va_alist] 328 */ 329 330 void 331 vlog(int level, const char *fmt, va_list ap) 332 { 333 334 kprintf_lock(); 335 336 klogpri(level); /* log the level first */ 337 kprintf(fmt, TOLOG, NULL, NULL, ap); 338 if (!log_open) 339 kprintf(fmt, TOCONS, NULL, NULL, ap); 340 341 kprintf_unlock(); 342 343 logwakeup(); /* wake up anyone waiting for log msgs */ 344 } 345 346 /* 347 * logpri: log the priority level to the klog 348 */ 349 350 void 351 logpri(int level) 352 { 353 354 kprintf_lock(); 355 klogpri(level); 356 kprintf_unlock(); 357 } 358 359 /* 360 * Note: we must be in the mutex here! 361 */ 362 void 363 klogpri(int level) 364 { 365 char *p; 366 char snbuf[KPRINTF_BUFSIZE]; 367 368 putchar('<', TOLOG, NULL); 369 snprintf(snbuf, sizeof(snbuf), "%d", level); 370 for (p = snbuf ; *p ; p++) 371 putchar(*p, TOLOG, NULL); 372 putchar('>', TOLOG, NULL); 373 } 374 375 /* 376 * addlog: add info to previous log message 377 */ 378 379 void 380 addlog(const char *fmt, ...) 381 { 382 va_list ap; 383 384 kprintf_lock(); 385 386 va_start(ap, fmt); 387 kprintf(fmt, TOLOG, NULL, NULL, ap); 388 va_end(ap); 389 if (!log_open) { 390 va_start(ap, fmt); 391 kprintf(fmt, TOCONS, NULL, NULL, ap); 392 va_end(ap); 393 } 394 395 kprintf_unlock(); 396 397 logwakeup(); 398 } 399 400 401 /* 402 * putchar: print a single character on console or user terminal. 403 * 404 * => if console, then the last MSGBUFS chars are saved in msgbuf 405 * for inspection later (e.g. dmesg/syslog) 406 * => we must already be in the mutex! 407 */ 408 static void 409 putchar(int c, int flags, struct tty *tp) 410 { 411 412 if (panicstr) 413 constty = NULL; 414 if ((flags & TOCONS) && tp == NULL && constty) { 415 tp = constty; 416 flags |= TOTTY; 417 } 418 if ((flags & TOTTY) && tp && 419 tputchar(c, flags, tp) < 0 && 420 (flags & TOCONS) && tp == constty) 421 constty = NULL; 422 if ((flags & TOLOG) && 423 c != '\0' && c != '\r' && c != 0177) 424 logputchar(c); 425 if ((flags & TOCONS) && constty == NULL && c != '\0') 426 (*v_putc)(c); 427 #ifdef DDB 428 if (flags & TODDB) 429 db_putchar(c); 430 #endif 431 } 432 433 /* 434 * tablefull: warn that a system table is full 435 */ 436 437 void 438 tablefull(const char *tab, const char *hint) 439 { 440 if (hint) 441 log(LOG_ERR, "%s: table is full - %s\n", tab, hint); 442 else 443 log(LOG_ERR, "%s: table is full\n", tab); 444 } 445 446 447 /* 448 * uprintf: print to the controlling tty of the current process 449 * 450 * => we may block if the tty queue is full 451 * => no message is printed if the queue doesn't clear in a reasonable 452 * time 453 */ 454 455 void 456 uprintf(const char *fmt, ...) 457 { 458 struct proc *p = curproc; 459 va_list ap; 460 461 /* mutex_enter(proc_lock); XXXSMP */ 462 463 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 464 /* No mutex needed; going to process TTY. */ 465 va_start(ap, fmt); 466 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 467 va_end(ap); 468 } 469 470 /* mutex_exit(proc_lock); XXXSMP */ 471 } 472 473 void 474 uprintf_locked(const char *fmt, ...) 475 { 476 struct proc *p = curproc; 477 va_list ap; 478 479 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 480 /* No mutex needed; going to process TTY. */ 481 va_start(ap, fmt); 482 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 483 va_end(ap); 484 } 485 } 486 487 /* 488 * tprintf functions: used to send messages to a specific process 489 * 490 * usage: 491 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 492 * use the handle when calling "tprintf" 493 * when done, do a "tprintf_close" to drop the handle 494 */ 495 496 /* 497 * tprintf_open: get a tprintf handle on a process "p" 498 * 499 * => returns NULL if process can't be printed to 500 */ 501 502 tpr_t 503 tprintf_open(struct proc *p) 504 { 505 tpr_t cookie; 506 507 cookie = NULL; 508 509 mutex_enter(proc_lock); 510 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 511 SESSHOLD(p->p_session); 512 cookie = (tpr_t)p->p_session; 513 } 514 mutex_exit(proc_lock); 515 516 return cookie; 517 } 518 519 /* 520 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 521 */ 522 523 void 524 tprintf_close(tpr_t sess) 525 { 526 527 if (sess) { 528 mutex_enter(proc_lock); 529 SESSRELE((struct session *) sess); 530 mutex_exit(proc_lock); 531 } 532 } 533 534 /* 535 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 536 * send a message to the controlling tty for that process. 537 * 538 * => also sends message to /dev/klog 539 */ 540 void 541 tprintf(tpr_t tpr, const char *fmt, ...) 542 { 543 struct session *sess = (struct session *)tpr; 544 struct tty *tp = NULL; 545 int flags = TOLOG; 546 va_list ap; 547 548 /* mutex_enter(proc_lock); XXXSMP */ 549 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 550 flags |= TOTTY; 551 tp = sess->s_ttyp; 552 } 553 554 kprintf_lock(); 555 556 klogpri(LOG_INFO); 557 va_start(ap, fmt); 558 kprintf(fmt, flags, tp, NULL, ap); 559 va_end(ap); 560 561 kprintf_unlock(); 562 /* mutex_exit(proc_lock); XXXSMP */ 563 564 logwakeup(); 565 } 566 567 568 /* 569 * ttyprintf: send a message to a specific tty 570 * 571 * => should be used only by tty driver or anything that knows the 572 * underlying tty will not be revoked(2)'d away. [otherwise, 573 * use tprintf] 574 */ 575 void 576 ttyprintf(struct tty *tp, const char *fmt, ...) 577 { 578 va_list ap; 579 580 /* No mutex needed; going to process TTY. */ 581 va_start(ap, fmt); 582 kprintf(fmt, TOTTY, tp, NULL, ap); 583 va_end(ap); 584 } 585 586 #ifdef DDB 587 588 /* 589 * db_printf: printf for DDB (via db_putchar) 590 */ 591 592 void 593 db_printf(const char *fmt, ...) 594 { 595 va_list ap; 596 597 /* No mutex needed; DDB pauses all processors. */ 598 va_start(ap, fmt); 599 kprintf(fmt, TODDB, NULL, NULL, ap); 600 va_end(ap); 601 602 if (db_tee_msgbuf) { 603 va_start(ap, fmt); 604 kprintf(fmt, TOLOG, NULL, NULL, ap); 605 va_end(ap); 606 }; 607 } 608 609 void 610 db_vprintf(const char *fmt, va_list ap) 611 { 612 613 /* No mutex needed; DDB pauses all processors. */ 614 kprintf(fmt, TODDB, NULL, NULL, ap); 615 if (db_tee_msgbuf) 616 kprintf(fmt, TOLOG, NULL, NULL, ap); 617 } 618 619 #endif /* DDB */ 620 621 static void 622 kprintf_internal(const char *fmt, int oflags, void *vp, char *sbuf, ...) 623 { 624 va_list ap; 625 626 va_start(ap, sbuf); 627 (void)kprintf(fmt, oflags, vp, sbuf, ap); 628 va_end(ap); 629 } 630 631 /* 632 * Device autoconfiguration printf routines. These change their 633 * behavior based on the AB_* flags in boothowto. If AB_SILENT 634 * is set, messages never go to the console (but they still always 635 * go to the log). AB_VERBOSE overrides AB_SILENT. 636 */ 637 638 /* 639 * aprint_normal: Send to console unless AB_QUIET. Always goes 640 * to the log. 641 */ 642 static void 643 aprint_normal_internal(const char *prefix, const char *fmt, va_list ap) 644 { 645 int flags = TOLOG; 646 647 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 648 (boothowto & AB_VERBOSE) != 0) 649 flags |= TOCONS; 650 651 kprintf_lock(); 652 653 if (prefix) 654 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 655 kprintf(fmt, flags, NULL, NULL, ap); 656 657 kprintf_unlock(); 658 659 if (!panicstr) 660 logwakeup(); 661 } 662 663 void 664 aprint_normal(const char *fmt, ...) 665 { 666 va_list ap; 667 668 va_start(ap, fmt); 669 aprint_normal_internal(NULL, fmt, ap); 670 va_end(ap); 671 } 672 673 void 674 aprint_normal_dev(device_t dv, const char *fmt, ...) 675 { 676 va_list ap; 677 678 va_start(ap, fmt); 679 aprint_normal_internal(device_xname(dv), fmt, ap); 680 va_end(ap); 681 } 682 683 void 684 aprint_normal_ifnet(struct ifnet *ifp, const char *fmt, ...) 685 { 686 va_list ap; 687 688 va_start(ap, fmt); 689 aprint_normal_internal(ifp->if_xname, fmt, ap); 690 va_end(ap); 691 } 692 693 /* 694 * aprint_error: Send to console unless AB_QUIET. Always goes 695 * to the log. Also counts the number of times called so other 696 * parts of the kernel can report the number of errors during a 697 * given phase of system startup. 698 */ 699 static int aprint_error_count; 700 701 int 702 aprint_get_error_count(void) 703 { 704 int count; 705 706 kprintf_lock(); 707 708 count = aprint_error_count; 709 aprint_error_count = 0; 710 711 kprintf_unlock(); 712 713 return (count); 714 } 715 716 static void 717 aprint_error_internal(const char *prefix, const char *fmt, va_list ap) 718 { 719 int flags = TOLOG; 720 721 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 722 (boothowto & AB_VERBOSE) != 0) 723 flags |= TOCONS; 724 725 kprintf_lock(); 726 727 aprint_error_count++; 728 729 if (prefix) 730 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 731 kprintf(fmt, flags, NULL, NULL, ap); 732 733 kprintf_unlock(); 734 735 if (!panicstr) 736 logwakeup(); 737 } 738 739 void 740 aprint_error(const char *fmt, ...) 741 { 742 va_list ap; 743 744 va_start(ap, fmt); 745 aprint_error_internal(NULL, fmt, ap); 746 va_end(ap); 747 } 748 749 void 750 aprint_error_dev(device_t dv, const char *fmt, ...) 751 { 752 va_list ap; 753 754 va_start(ap, fmt); 755 aprint_error_internal(device_xname(dv), fmt, ap); 756 va_end(ap); 757 } 758 759 void 760 aprint_error_ifnet(struct ifnet *ifp, const char *fmt, ...) 761 { 762 va_list ap; 763 764 va_start(ap, fmt); 765 aprint_error_internal(ifp->if_xname, fmt, ap); 766 va_end(ap); 767 } 768 769 /* 770 * aprint_naive: Send to console only if AB_QUIET. Never goes 771 * to the log. 772 */ 773 static void 774 aprint_naive_internal(const char *prefix, const char *fmt, va_list ap) 775 { 776 777 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET) 778 return; 779 780 kprintf_lock(); 781 782 if (prefix) 783 kprintf_internal("%s: ", TOCONS, NULL, NULL, prefix); 784 kprintf(fmt, TOCONS, NULL, NULL, ap); 785 786 kprintf_unlock(); 787 } 788 789 void 790 aprint_naive(const char *fmt, ...) 791 { 792 va_list ap; 793 794 va_start(ap, fmt); 795 aprint_naive_internal(NULL, fmt, ap); 796 va_end(ap); 797 } 798 799 void 800 aprint_naive_dev(device_t dv, const char *fmt, ...) 801 { 802 va_list ap; 803 804 va_start(ap, fmt); 805 aprint_naive_internal(device_xname(dv), fmt, ap); 806 va_end(ap); 807 } 808 809 void 810 aprint_naive_ifnet(struct ifnet *ifp, const char *fmt, ...) 811 { 812 va_list ap; 813 814 va_start(ap, fmt); 815 aprint_naive_internal(ifp->if_xname, fmt, ap); 816 va_end(ap); 817 } 818 819 /* 820 * aprint_verbose: Send to console only if AB_VERBOSE. Always 821 * goes to the log. 822 */ 823 static void 824 aprint_verbose_internal(const char *prefix, const char *fmt, va_list ap) 825 { 826 int flags = TOLOG; 827 828 if (boothowto & AB_VERBOSE) 829 flags |= TOCONS; 830 831 kprintf_lock(); 832 833 if (prefix) 834 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 835 kprintf(fmt, flags, NULL, NULL, ap); 836 837 kprintf_unlock(); 838 839 if (!panicstr) 840 logwakeup(); 841 } 842 843 void 844 aprint_verbose(const char *fmt, ...) 845 { 846 va_list ap; 847 848 va_start(ap, fmt); 849 aprint_verbose_internal(NULL, fmt, ap); 850 va_end(ap); 851 } 852 853 void 854 aprint_verbose_dev(device_t dv, const char *fmt, ...) 855 { 856 va_list ap; 857 858 va_start(ap, fmt); 859 aprint_verbose_internal(device_xname(dv), fmt, ap); 860 va_end(ap); 861 } 862 863 void 864 aprint_verbose_ifnet(struct ifnet *ifp, const char *fmt, ...) 865 { 866 va_list ap; 867 868 va_start(ap, fmt); 869 aprint_verbose_internal(ifp->if_xname, fmt, ap); 870 va_end(ap); 871 } 872 873 /* 874 * aprint_debug: Send to console and log only if AB_DEBUG. 875 */ 876 static void 877 aprint_debug_internal(const char *prefix, const char *fmt, va_list ap) 878 { 879 880 if ((boothowto & AB_DEBUG) == 0) 881 return; 882 883 kprintf_lock(); 884 885 if (prefix) 886 kprintf_internal("%s: ", TOCONS | TOLOG, NULL, NULL, prefix); 887 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 888 889 kprintf_unlock(); 890 } 891 892 void 893 aprint_debug(const char *fmt, ...) 894 { 895 va_list ap; 896 897 va_start(ap, fmt); 898 aprint_debug_internal(NULL, fmt, ap); 899 va_end(ap); 900 } 901 902 void 903 aprint_debug_dev(device_t dv, const char *fmt, ...) 904 { 905 va_list ap; 906 907 va_start(ap, fmt); 908 aprint_debug_internal(device_xname(dv), fmt, ap); 909 va_end(ap); 910 } 911 912 void 913 aprint_debug_ifnet(struct ifnet *ifp, const char *fmt, ...) 914 { 915 va_list ap; 916 917 va_start(ap, fmt); 918 aprint_debug_internal(ifp->if_xname, fmt, ap); 919 va_end(ap); 920 } 921 922 void 923 printf_tolog(const char *fmt, ...) 924 { 925 va_list ap; 926 927 kprintf_lock(); 928 929 va_start(ap, fmt); 930 (void)kprintf(fmt, TOLOG, NULL, NULL, ap); 931 va_end(ap); 932 933 kprintf_unlock(); 934 } 935 936 /* 937 * printf_nolog: Like printf(), but does not send message to the log. 938 */ 939 940 void 941 printf_nolog(const char *fmt, ...) 942 { 943 va_list ap; 944 945 kprintf_lock(); 946 947 va_start(ap, fmt); 948 kprintf(fmt, TOCONS, NULL, NULL, ap); 949 va_end(ap); 950 951 kprintf_unlock(); 952 } 953 954 /* 955 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 956 */ 957 958 /* 959 * printf: print a message to the console and the log 960 */ 961 void 962 printf(const char *fmt, ...) 963 { 964 va_list ap; 965 966 kprintf_lock(); 967 968 va_start(ap, fmt); 969 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 970 va_end(ap); 971 972 kprintf_unlock(); 973 974 if (!panicstr) 975 logwakeup(); 976 } 977 978 /* 979 * vprintf: print a message to the console and the log [already have 980 * va_alist] 981 */ 982 983 void 984 vprintf(const char *fmt, va_list ap) 985 { 986 987 kprintf_lock(); 988 989 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 990 991 kprintf_unlock(); 992 993 if (!panicstr) 994 logwakeup(); 995 } 996 997 /* 998 * sprintf: print a message to a buffer 999 */ 1000 int 1001 sprintf(char *bf, const char *fmt, ...) 1002 { 1003 int retval; 1004 va_list ap; 1005 1006 va_start(ap, fmt); 1007 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 1008 va_end(ap); 1009 *(bf + retval) = 0; /* null terminate */ 1010 return(retval); 1011 } 1012 1013 /* 1014 * vsprintf: print a message to a buffer [already have va_alist] 1015 */ 1016 1017 int 1018 vsprintf(char *bf, const char *fmt, va_list ap) 1019 { 1020 int retval; 1021 1022 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 1023 *(bf + retval) = 0; /* null terminate */ 1024 return (retval); 1025 } 1026 1027 /* 1028 * snprintf: print a message to a buffer 1029 */ 1030 int 1031 snprintf(char *bf, size_t size, const char *fmt, ...) 1032 { 1033 int retval; 1034 va_list ap; 1035 char *p; 1036 1037 if (size < 1) 1038 return (-1); 1039 p = bf + size - 1; 1040 va_start(ap, fmt); 1041 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1042 va_end(ap); 1043 *(p) = 0; /* null terminate */ 1044 return(retval); 1045 } 1046 1047 /* 1048 * vsnprintf: print a message to a buffer [already have va_alist] 1049 */ 1050 int 1051 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 1052 { 1053 int retval; 1054 char *p; 1055 1056 if (size < 1) 1057 return (-1); 1058 p = bf + size - 1; 1059 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1060 *(p) = 0; /* null terminate */ 1061 return(retval); 1062 } 1063 1064 /* 1065 * kprintf: scaled down version of printf(3). 1066 * 1067 * this version based on vfprintf() from libc which was derived from 1068 * software contributed to Berkeley by Chris Torek. 1069 * 1070 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 1071 */ 1072 1073 /* 1074 * macros for converting digits to letters and vice versa 1075 */ 1076 #define to_digit(c) ((c) - '0') 1077 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1078 #define to_char(n) ((n) + '0') 1079 1080 /* 1081 * flags used during conversion. 1082 */ 1083 #define ALT 0x001 /* alternate form */ 1084 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1085 #define LADJUST 0x004 /* left adjustment */ 1086 #define LONGDBL 0x008 /* long double; unimplemented */ 1087 #define LONGINT 0x010 /* long integer */ 1088 #define QUADINT 0x020 /* quad integer */ 1089 #define SHORTINT 0x040 /* short integer */ 1090 #define MAXINT 0x080 /* intmax_t */ 1091 #define PTRINT 0x100 /* intptr_t */ 1092 #define SIZEINT 0x200 /* size_t */ 1093 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1094 #define FPT 0x800 /* Floating point number */ 1095 1096 /* 1097 * To extend shorts properly, we need both signed and unsigned 1098 * argument extraction methods. 1099 */ 1100 #define SARG() \ 1101 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1102 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1103 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1104 flags&QUADINT ? va_arg(ap, quad_t) : \ 1105 flags&LONGINT ? va_arg(ap, long) : \ 1106 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1107 (long)va_arg(ap, int)) 1108 #define UARG() \ 1109 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1110 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1111 flags&SIZEINT ? va_arg(ap, size_t) : \ 1112 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1113 flags&LONGINT ? va_arg(ap, u_long) : \ 1114 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1115 (u_long)va_arg(ap, u_int)) 1116 1117 #define KPRINTF_PUTCHAR(C) { \ 1118 if (oflags == TOBUFONLY) { \ 1119 if ((vp != NULL) && (sbuf == tailp)) { \ 1120 ret += 1; /* indicate error */ \ 1121 goto overflow; \ 1122 } \ 1123 *sbuf++ = (C); \ 1124 } else { \ 1125 putchar((C), oflags, (struct tty *)vp); \ 1126 } \ 1127 } 1128 1129 /* 1130 * Guts of kernel printf. Note, we already expect to be in a mutex! 1131 */ 1132 int 1133 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1134 { 1135 const char *fmt; /* format string */ 1136 int ch; /* character from fmt */ 1137 int n; /* handy integer (short term usage) */ 1138 char *cp; /* handy char pointer (short term usage) */ 1139 int flags; /* flags as above */ 1140 int ret; /* return value accumulator */ 1141 int width; /* width from format (%8d), or 0 */ 1142 int prec; /* precision from format (%.3d), or -1 */ 1143 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1144 1145 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1146 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1147 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1148 int realsz; /* field size expanded by dprec */ 1149 int size; /* size of converted field or string */ 1150 const char *xdigs; /* digits for [xX] conversion */ 1151 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1152 char *tailp; /* tail pointer for snprintf */ 1153 1154 tailp = NULL; /* XXX: shutup gcc */ 1155 if (oflags == TOBUFONLY && (vp != NULL)) 1156 tailp = *(char **)vp; 1157 1158 cp = NULL; /* XXX: shutup gcc */ 1159 size = 0; /* XXX: shutup gcc */ 1160 1161 fmt = fmt0; 1162 ret = 0; 1163 1164 xdigs = NULL; /* XXX: shut up gcc warning */ 1165 1166 /* 1167 * Scan the format for conversions (`%' character). 1168 */ 1169 for (;;) { 1170 while (*fmt != '%' && *fmt) { 1171 ret++; 1172 KPRINTF_PUTCHAR(*fmt++); 1173 } 1174 if (*fmt == 0) 1175 goto done; 1176 1177 fmt++; /* skip over '%' */ 1178 1179 flags = 0; 1180 dprec = 0; 1181 width = 0; 1182 prec = -1; 1183 sign = '\0'; 1184 1185 rflag: ch = *fmt++; 1186 reswitch: switch (ch) { 1187 case ' ': 1188 /* 1189 * ``If the space and + flags both appear, the space 1190 * flag will be ignored.'' 1191 * -- ANSI X3J11 1192 */ 1193 if (!sign) 1194 sign = ' '; 1195 goto rflag; 1196 case '#': 1197 flags |= ALT; 1198 goto rflag; 1199 case '*': 1200 /* 1201 * ``A negative field width argument is taken as a 1202 * - flag followed by a positive field width.'' 1203 * -- ANSI X3J11 1204 * They don't exclude field widths read from args. 1205 */ 1206 if ((width = va_arg(ap, int)) >= 0) 1207 goto rflag; 1208 width = -width; 1209 /* FALLTHROUGH */ 1210 case '-': 1211 flags |= LADJUST; 1212 goto rflag; 1213 case '+': 1214 sign = '+'; 1215 goto rflag; 1216 case '.': 1217 if ((ch = *fmt++) == '*') { 1218 n = va_arg(ap, int); 1219 prec = n < 0 ? -1 : n; 1220 goto rflag; 1221 } 1222 n = 0; 1223 while (is_digit(ch)) { 1224 n = 10 * n + to_digit(ch); 1225 ch = *fmt++; 1226 } 1227 prec = n < 0 ? -1 : n; 1228 goto reswitch; 1229 case '0': 1230 /* 1231 * ``Note that 0 is taken as a flag, not as the 1232 * beginning of a field width.'' 1233 * -- ANSI X3J11 1234 */ 1235 flags |= ZEROPAD; 1236 goto rflag; 1237 case '1': case '2': case '3': case '4': 1238 case '5': case '6': case '7': case '8': case '9': 1239 n = 0; 1240 do { 1241 n = 10 * n + to_digit(ch); 1242 ch = *fmt++; 1243 } while (is_digit(ch)); 1244 width = n; 1245 goto reswitch; 1246 case 'h': 1247 flags |= SHORTINT; 1248 goto rflag; 1249 case 'j': 1250 flags |= MAXINT; 1251 goto rflag; 1252 case 'l': 1253 if (*fmt == 'l') { 1254 fmt++; 1255 flags |= QUADINT; 1256 } else { 1257 flags |= LONGINT; 1258 } 1259 goto rflag; 1260 case 'q': 1261 flags |= QUADINT; 1262 goto rflag; 1263 case 't': 1264 flags |= PTRINT; 1265 goto rflag; 1266 case 'z': 1267 flags |= SIZEINT; 1268 goto rflag; 1269 case 'c': 1270 *(cp = bf) = va_arg(ap, int); 1271 size = 1; 1272 sign = '\0'; 1273 break; 1274 case 'D': 1275 flags |= LONGINT; 1276 /*FALLTHROUGH*/ 1277 case 'd': 1278 case 'i': 1279 _uquad = SARG(); 1280 if ((quad_t)_uquad < 0) { 1281 _uquad = -_uquad; 1282 sign = '-'; 1283 } 1284 base = DEC; 1285 goto number; 1286 case 'n': 1287 if (flags & MAXINT) 1288 *va_arg(ap, intmax_t *) = ret; 1289 else if (flags & PTRINT) 1290 *va_arg(ap, intptr_t *) = ret; 1291 else if (flags & SIZEINT) 1292 *va_arg(ap, ssize_t *) = ret; 1293 else if (flags & QUADINT) 1294 *va_arg(ap, quad_t *) = ret; 1295 else if (flags & LONGINT) 1296 *va_arg(ap, long *) = ret; 1297 else if (flags & SHORTINT) 1298 *va_arg(ap, short *) = ret; 1299 else 1300 *va_arg(ap, int *) = ret; 1301 continue; /* no output */ 1302 case 'O': 1303 flags |= LONGINT; 1304 /*FALLTHROUGH*/ 1305 case 'o': 1306 _uquad = UARG(); 1307 base = OCT; 1308 goto nosign; 1309 case 'p': 1310 /* 1311 * ``The argument shall be a pointer to void. The 1312 * value of the pointer is converted to a sequence 1313 * of printable characters, in an implementation- 1314 * defined manner.'' 1315 * -- ANSI X3J11 1316 */ 1317 /* NOSTRICT */ 1318 _uquad = (u_long)va_arg(ap, void *); 1319 base = HEX; 1320 xdigs = hexdigits; 1321 flags |= HEXPREFIX; 1322 ch = 'x'; 1323 goto nosign; 1324 case 's': 1325 if ((cp = va_arg(ap, char *)) == NULL) 1326 /*XXXUNCONST*/ 1327 cp = __UNCONST("(null)"); 1328 if (prec >= 0) { 1329 /* 1330 * can't use strlen; can only look for the 1331 * NUL in the first `prec' characters, and 1332 * strlen() will go further. 1333 */ 1334 char *p = memchr(cp, 0, prec); 1335 1336 if (p != NULL) { 1337 size = p - cp; 1338 if (size > prec) 1339 size = prec; 1340 } else 1341 size = prec; 1342 } else 1343 size = strlen(cp); 1344 sign = '\0'; 1345 break; 1346 case 'U': 1347 flags |= LONGINT; 1348 /*FALLTHROUGH*/ 1349 case 'u': 1350 _uquad = UARG(); 1351 base = DEC; 1352 goto nosign; 1353 case 'X': 1354 xdigs = HEXDIGITS; 1355 goto hex; 1356 case 'x': 1357 xdigs = hexdigits; 1358 hex: _uquad = UARG(); 1359 base = HEX; 1360 /* leading 0x/X only if non-zero */ 1361 if (flags & ALT && _uquad != 0) 1362 flags |= HEXPREFIX; 1363 1364 /* unsigned conversions */ 1365 nosign: sign = '\0'; 1366 /* 1367 * ``... diouXx conversions ... if a precision is 1368 * specified, the 0 flag will be ignored.'' 1369 * -- ANSI X3J11 1370 */ 1371 number: if ((dprec = prec) >= 0) 1372 flags &= ~ZEROPAD; 1373 1374 /* 1375 * ``The result of converting a zero value with an 1376 * explicit precision of zero is no characters.'' 1377 * -- ANSI X3J11 1378 */ 1379 cp = bf + KPRINTF_BUFSIZE; 1380 if (_uquad != 0 || prec != 0) { 1381 /* 1382 * Unsigned mod is hard, and unsigned mod 1383 * by a constant is easier than that by 1384 * a variable; hence this switch. 1385 */ 1386 switch (base) { 1387 case OCT: 1388 do { 1389 *--cp = to_char(_uquad & 7); 1390 _uquad >>= 3; 1391 } while (_uquad); 1392 /* handle octal leading 0 */ 1393 if (flags & ALT && *cp != '0') 1394 *--cp = '0'; 1395 break; 1396 1397 case DEC: 1398 /* many numbers are 1 digit */ 1399 while (_uquad >= 10) { 1400 *--cp = to_char(_uquad % 10); 1401 _uquad /= 10; 1402 } 1403 *--cp = to_char(_uquad); 1404 break; 1405 1406 case HEX: 1407 do { 1408 *--cp = xdigs[_uquad & 15]; 1409 _uquad >>= 4; 1410 } while (_uquad); 1411 break; 1412 1413 default: 1414 /*XXXUNCONST*/ 1415 cp = __UNCONST("bug in kprintf: bad base"); 1416 size = strlen(cp); 1417 goto skipsize; 1418 } 1419 } 1420 size = bf + KPRINTF_BUFSIZE - cp; 1421 skipsize: 1422 break; 1423 default: /* "%?" prints ?, unless ? is NUL */ 1424 if (ch == '\0') 1425 goto done; 1426 /* pretend it was %c with argument ch */ 1427 cp = bf; 1428 *cp = ch; 1429 size = 1; 1430 sign = '\0'; 1431 break; 1432 } 1433 1434 /* 1435 * All reasonable formats wind up here. At this point, `cp' 1436 * points to a string which (if not flags&LADJUST) should be 1437 * padded out to `width' places. If flags&ZEROPAD, it should 1438 * first be prefixed by any sign or other prefix; otherwise, 1439 * it should be blank padded before the prefix is emitted. 1440 * After any left-hand padding and prefixing, emit zeroes 1441 * required by a decimal [diouxX] precision, then print the 1442 * string proper, then emit zeroes required by any leftover 1443 * floating precision; finally, if LADJUST, pad with blanks. 1444 * 1445 * Compute actual size, so we know how much to pad. 1446 * size excludes decimal prec; realsz includes it. 1447 */ 1448 realsz = dprec > size ? dprec : size; 1449 if (sign) 1450 realsz++; 1451 else if (flags & HEXPREFIX) 1452 realsz+= 2; 1453 1454 /* adjust ret */ 1455 ret += width > realsz ? width : realsz; 1456 1457 /* right-adjusting blank padding */ 1458 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1459 n = width - realsz; 1460 while (n-- > 0) 1461 KPRINTF_PUTCHAR(' '); 1462 } 1463 1464 /* prefix */ 1465 if (sign) { 1466 KPRINTF_PUTCHAR(sign); 1467 } else if (flags & HEXPREFIX) { 1468 KPRINTF_PUTCHAR('0'); 1469 KPRINTF_PUTCHAR(ch); 1470 } 1471 1472 /* right-adjusting zero padding */ 1473 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1474 n = width - realsz; 1475 while (n-- > 0) 1476 KPRINTF_PUTCHAR('0'); 1477 } 1478 1479 /* leading zeroes from decimal precision */ 1480 n = dprec - size; 1481 while (n-- > 0) 1482 KPRINTF_PUTCHAR('0'); 1483 1484 /* the string or number proper */ 1485 while (size--) 1486 KPRINTF_PUTCHAR(*cp++); 1487 /* left-adjusting padding (always blank) */ 1488 if (flags & LADJUST) { 1489 n = width - realsz; 1490 while (n-- > 0) 1491 KPRINTF_PUTCHAR(' '); 1492 } 1493 } 1494 1495 done: 1496 if ((oflags == TOBUFONLY) && (vp != NULL)) 1497 *(char **)vp = sbuf; 1498 (*v_flush)(); 1499 overflow: 1500 return (ret); 1501 /* NOTREACHED */ 1502 } 1503
Indexes created Wed Sep 24 05:09:52 GMT 2025