subr_prf.c revision 1.124.2.2
1 /* $NetBSD: subr_prf.c,v 1.124.2.2 2009/03/03 18:32:56 skrll 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 1.124.2.2 2009/03/03 18:32:56 skrll 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 #ifndef _RUMPKERNEL /* XXXpooka: temporary build fix, see kern/40505 */ 228 DELAY(10); 229 #endif /* _RUMPKERNEL */ 230 } 231 } 232 233 /* 234 * Convert the current thread to a bound thread and prevent all 235 * CPUs from scheduling unbound jobs. Do so without taking any 236 * locks. 237 */ 238 curlwp->l_pflag |= LP_BOUND; 239 for (CPU_INFO_FOREACH(cii, ci)) { 240 ci->ci_schedstate.spc_flags |= SPCF_OFFLINE; 241 } 242 243 bootopt = RB_AUTOBOOT | RB_NOSYNC; 244 if (dumponpanic) 245 bootopt |= RB_DUMP; 246 if (!panicstr) 247 panicstr = fmt; 248 doing_shutdown = 1; 249 250 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 251 panicstart = msgbufp->msg_bufx; 252 253 va_start(ap, fmt); 254 printf("panic: "); 255 vprintf(fmt, ap); 256 printf("\n"); 257 va_end(ap); 258 259 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 260 panicend = msgbufp->msg_bufx; 261 262 #ifdef IPKDB 263 ipkdb_panic(); 264 #endif 265 #ifdef KGDB 266 kgdb_panic(); 267 #endif 268 #ifdef KADB 269 if (boothowto & RB_KDB) 270 kdbpanic(); 271 #endif 272 #ifdef DDB 273 if (db_onpanic == 1) 274 Debugger(); 275 else if (db_onpanic >= 0) { 276 static int intrace = 0; 277 278 if (intrace == 0) { 279 intrace = 1; 280 printf("Begin traceback...\n"); 281 db_stack_trace_print( 282 (db_expr_t)(intptr_t)__builtin_frame_address(0), 283 true, 65535, "", printf); 284 printf("End traceback...\n"); 285 intrace = 0; 286 } else 287 printf("Faulted in mid-traceback; aborting..."); 288 if (db_onpanic == 2) 289 Debugger(); 290 } 291 #endif 292 cpu_reboot(bootopt, NULL); 293 } 294 295 /* 296 * kernel logging functions: log, logpri, addlog 297 */ 298 299 /* 300 * log: write to the log buffer 301 * 302 * => will not sleep [so safe to call from interrupt] 303 * => will log to console if /dev/klog isn't open 304 */ 305 306 void 307 log(int level, const char *fmt, ...) 308 { 309 va_list ap; 310 311 kprintf_lock(); 312 313 klogpri(level); /* log the level first */ 314 va_start(ap, fmt); 315 kprintf(fmt, TOLOG, NULL, NULL, ap); 316 va_end(ap); 317 if (!log_open) { 318 va_start(ap, fmt); 319 kprintf(fmt, TOCONS, NULL, NULL, ap); 320 va_end(ap); 321 } 322 323 kprintf_unlock(); 324 325 logwakeup(); /* wake up anyone waiting for log msgs */ 326 } 327 328 /* 329 * vlog: write to the log buffer [already have va_alist] 330 */ 331 332 void 333 vlog(int level, const char *fmt, va_list ap) 334 { 335 336 kprintf_lock(); 337 338 klogpri(level); /* log the level first */ 339 kprintf(fmt, TOLOG, NULL, NULL, ap); 340 if (!log_open) 341 kprintf(fmt, TOCONS, NULL, NULL, ap); 342 343 kprintf_unlock(); 344 345 logwakeup(); /* wake up anyone waiting for log msgs */ 346 } 347 348 /* 349 * logpri: log the priority level to the klog 350 */ 351 352 void 353 logpri(int level) 354 { 355 356 kprintf_lock(); 357 klogpri(level); 358 kprintf_unlock(); 359 } 360 361 /* 362 * Note: we must be in the mutex here! 363 */ 364 void 365 klogpri(int level) 366 { 367 char *p; 368 char snbuf[KPRINTF_BUFSIZE]; 369 370 putchar('<', TOLOG, NULL); 371 snprintf(snbuf, sizeof(snbuf), "%d", level); 372 for (p = snbuf ; *p ; p++) 373 putchar(*p, TOLOG, NULL); 374 putchar('>', TOLOG, NULL); 375 } 376 377 /* 378 * addlog: add info to previous log message 379 */ 380 381 void 382 addlog(const char *fmt, ...) 383 { 384 va_list ap; 385 386 kprintf_lock(); 387 388 va_start(ap, fmt); 389 kprintf(fmt, TOLOG, NULL, NULL, ap); 390 va_end(ap); 391 if (!log_open) { 392 va_start(ap, fmt); 393 kprintf(fmt, TOCONS, NULL, NULL, ap); 394 va_end(ap); 395 } 396 397 kprintf_unlock(); 398 399 logwakeup(); 400 } 401 402 403 /* 404 * putchar: print a single character on console or user terminal. 405 * 406 * => if console, then the last MSGBUFS chars are saved in msgbuf 407 * for inspection later (e.g. dmesg/syslog) 408 * => we must already be in the mutex! 409 */ 410 static void 411 putchar(int c, int flags, struct tty *tp) 412 { 413 414 if (panicstr) 415 constty = NULL; 416 if ((flags & TOCONS) && tp == NULL && constty) { 417 tp = constty; 418 flags |= TOTTY; 419 } 420 if ((flags & TOTTY) && tp && 421 tputchar(c, flags, tp) < 0 && 422 (flags & TOCONS) && tp == constty) 423 constty = NULL; 424 if ((flags & TOLOG) && 425 c != '\0' && c != '\r' && c != 0177) 426 logputchar(c); 427 if ((flags & TOCONS) && constty == NULL && c != '\0') 428 (*v_putc)(c); 429 #ifdef DDB 430 if (flags & TODDB) 431 db_putchar(c); 432 #endif 433 } 434 435 /* 436 * tablefull: warn that a system table is full 437 */ 438 439 void 440 tablefull(const char *tab, const char *hint) 441 { 442 if (hint) 443 log(LOG_ERR, "%s: table is full - %s\n", tab, hint); 444 else 445 log(LOG_ERR, "%s: table is full\n", tab); 446 } 447 448 449 /* 450 * uprintf: print to the controlling tty of the current process 451 * 452 * => we may block if the tty queue is full 453 * => no message is printed if the queue doesn't clear in a reasonable 454 * time 455 */ 456 457 void 458 uprintf(const char *fmt, ...) 459 { 460 struct proc *p = curproc; 461 va_list ap; 462 463 /* mutex_enter(proc_lock); XXXSMP */ 464 465 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 466 /* No mutex needed; going to process TTY. */ 467 va_start(ap, fmt); 468 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 469 va_end(ap); 470 } 471 472 /* mutex_exit(proc_lock); XXXSMP */ 473 } 474 475 void 476 uprintf_locked(const char *fmt, ...) 477 { 478 struct proc *p = curproc; 479 va_list ap; 480 481 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 482 /* No mutex needed; going to process TTY. */ 483 va_start(ap, fmt); 484 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 485 va_end(ap); 486 } 487 } 488 489 /* 490 * tprintf functions: used to send messages to a specific process 491 * 492 * usage: 493 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 494 * use the handle when calling "tprintf" 495 * when done, do a "tprintf_close" to drop the handle 496 */ 497 498 /* 499 * tprintf_open: get a tprintf handle on a process "p" 500 * 501 * => returns NULL if process can't be printed to 502 */ 503 504 tpr_t 505 tprintf_open(struct proc *p) 506 { 507 tpr_t cookie; 508 509 cookie = NULL; 510 511 mutex_enter(proc_lock); 512 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 513 SESSHOLD(p->p_session); 514 cookie = (tpr_t)p->p_session; 515 } 516 mutex_exit(proc_lock); 517 518 return cookie; 519 } 520 521 /* 522 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 523 */ 524 525 void 526 tprintf_close(tpr_t sess) 527 { 528 529 if (sess) { 530 mutex_enter(proc_lock); 531 SESSRELE((struct session *) sess); 532 mutex_exit(proc_lock); 533 } 534 } 535 536 /* 537 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 538 * send a message to the controlling tty for that process. 539 * 540 * => also sends message to /dev/klog 541 */ 542 void 543 tprintf(tpr_t tpr, const char *fmt, ...) 544 { 545 struct session *sess = (struct session *)tpr; 546 struct tty *tp = NULL; 547 int flags = TOLOG; 548 va_list ap; 549 550 /* mutex_enter(proc_lock); XXXSMP */ 551 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 552 flags |= TOTTY; 553 tp = sess->s_ttyp; 554 } 555 556 kprintf_lock(); 557 558 klogpri(LOG_INFO); 559 va_start(ap, fmt); 560 kprintf(fmt, flags, tp, NULL, ap); 561 va_end(ap); 562 563 kprintf_unlock(); 564 /* mutex_exit(proc_lock); XXXSMP */ 565 566 logwakeup(); 567 } 568 569 570 /* 571 * ttyprintf: send a message to a specific tty 572 * 573 * => should be used only by tty driver or anything that knows the 574 * underlying tty will not be revoked(2)'d away. [otherwise, 575 * use tprintf] 576 */ 577 void 578 ttyprintf(struct tty *tp, const char *fmt, ...) 579 { 580 va_list ap; 581 582 /* No mutex needed; going to process TTY. */ 583 va_start(ap, fmt); 584 kprintf(fmt, TOTTY, tp, NULL, ap); 585 va_end(ap); 586 } 587 588 #ifdef DDB 589 590 /* 591 * db_printf: printf for DDB (via db_putchar) 592 */ 593 594 void 595 db_printf(const char *fmt, ...) 596 { 597 va_list ap; 598 599 /* No mutex needed; DDB pauses all processors. */ 600 va_start(ap, fmt); 601 kprintf(fmt, TODDB, NULL, NULL, ap); 602 va_end(ap); 603 604 if (db_tee_msgbuf) { 605 va_start(ap, fmt); 606 kprintf(fmt, TOLOG, NULL, NULL, ap); 607 va_end(ap); 608 }; 609 } 610 611 void 612 db_vprintf(const char *fmt, va_list ap) 613 { 614 615 /* No mutex needed; DDB pauses all processors. */ 616 kprintf(fmt, TODDB, NULL, NULL, ap); 617 if (db_tee_msgbuf) 618 kprintf(fmt, TOLOG, NULL, NULL, ap); 619 } 620 621 #endif /* DDB */ 622 623 static void 624 kprintf_internal(const char *fmt, int oflags, void *vp, char *sbuf, ...) 625 { 626 va_list ap; 627 628 va_start(ap, sbuf); 629 (void)kprintf(fmt, oflags, vp, sbuf, ap); 630 va_end(ap); 631 } 632 633 /* 634 * Device autoconfiguration printf routines. These change their 635 * behavior based on the AB_* flags in boothowto. If AB_SILENT 636 * is set, messages never go to the console (but they still always 637 * go to the log). AB_VERBOSE overrides AB_SILENT. 638 */ 639 640 /* 641 * aprint_normal: Send to console unless AB_QUIET. Always goes 642 * to the log. 643 */ 644 static void 645 aprint_normal_internal(const char *prefix, const char *fmt, va_list ap) 646 { 647 int flags = TOLOG; 648 649 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 650 (boothowto & AB_VERBOSE) != 0) 651 flags |= TOCONS; 652 653 kprintf_lock(); 654 655 if (prefix) 656 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 657 kprintf(fmt, flags, NULL, NULL, ap); 658 659 kprintf_unlock(); 660 661 if (!panicstr) 662 logwakeup(); 663 } 664 665 void 666 aprint_normal(const char *fmt, ...) 667 { 668 va_list ap; 669 670 va_start(ap, fmt); 671 aprint_normal_internal(NULL, fmt, ap); 672 va_end(ap); 673 } 674 675 void 676 aprint_normal_dev(device_t dv, const char *fmt, ...) 677 { 678 va_list ap; 679 680 va_start(ap, fmt); 681 aprint_normal_internal(device_xname(dv), fmt, ap); 682 va_end(ap); 683 } 684 685 void 686 aprint_normal_ifnet(struct ifnet *ifp, const char *fmt, ...) 687 { 688 va_list ap; 689 690 va_start(ap, fmt); 691 aprint_normal_internal(ifp->if_xname, fmt, ap); 692 va_end(ap); 693 } 694 695 /* 696 * aprint_error: Send to console unless AB_QUIET. Always goes 697 * to the log. Also counts the number of times called so other 698 * parts of the kernel can report the number of errors during a 699 * given phase of system startup. 700 */ 701 static int aprint_error_count; 702 703 int 704 aprint_get_error_count(void) 705 { 706 int count; 707 708 kprintf_lock(); 709 710 count = aprint_error_count; 711 aprint_error_count = 0; 712 713 kprintf_unlock(); 714 715 return (count); 716 } 717 718 static void 719 aprint_error_internal(const char *prefix, const char *fmt, va_list ap) 720 { 721 int flags = TOLOG; 722 723 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 724 (boothowto & AB_VERBOSE) != 0) 725 flags |= TOCONS; 726 727 kprintf_lock(); 728 729 aprint_error_count++; 730 731 if (prefix) 732 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 733 kprintf(fmt, flags, NULL, NULL, ap); 734 735 kprintf_unlock(); 736 737 if (!panicstr) 738 logwakeup(); 739 } 740 741 void 742 aprint_error(const char *fmt, ...) 743 { 744 va_list ap; 745 746 va_start(ap, fmt); 747 aprint_error_internal(NULL, fmt, ap); 748 va_end(ap); 749 } 750 751 void 752 aprint_error_dev(device_t dv, const char *fmt, ...) 753 { 754 va_list ap; 755 756 va_start(ap, fmt); 757 aprint_error_internal(device_xname(dv), fmt, ap); 758 va_end(ap); 759 } 760 761 void 762 aprint_error_ifnet(struct ifnet *ifp, const char *fmt, ...) 763 { 764 va_list ap; 765 766 va_start(ap, fmt); 767 aprint_error_internal(ifp->if_xname, fmt, ap); 768 va_end(ap); 769 } 770 771 /* 772 * aprint_naive: Send to console only if AB_QUIET. Never goes 773 * to the log. 774 */ 775 static void 776 aprint_naive_internal(const char *prefix, const char *fmt, va_list ap) 777 { 778 779 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET) 780 return; 781 782 kprintf_lock(); 783 784 if (prefix) 785 kprintf_internal("%s: ", TOCONS, NULL, NULL, prefix); 786 kprintf(fmt, TOCONS, NULL, NULL, ap); 787 788 kprintf_unlock(); 789 } 790 791 void 792 aprint_naive(const char *fmt, ...) 793 { 794 va_list ap; 795 796 va_start(ap, fmt); 797 aprint_naive_internal(NULL, fmt, ap); 798 va_end(ap); 799 } 800 801 void 802 aprint_naive_dev(device_t dv, const char *fmt, ...) 803 { 804 va_list ap; 805 806 va_start(ap, fmt); 807 aprint_naive_internal(device_xname(dv), fmt, ap); 808 va_end(ap); 809 } 810 811 void 812 aprint_naive_ifnet(struct ifnet *ifp, const char *fmt, ...) 813 { 814 va_list ap; 815 816 va_start(ap, fmt); 817 aprint_naive_internal(ifp->if_xname, fmt, ap); 818 va_end(ap); 819 } 820 821 /* 822 * aprint_verbose: Send to console only if AB_VERBOSE. Always 823 * goes to the log. 824 */ 825 static void 826 aprint_verbose_internal(const char *prefix, const char *fmt, va_list ap) 827 { 828 int flags = TOLOG; 829 830 if (boothowto & AB_VERBOSE) 831 flags |= TOCONS; 832 833 kprintf_lock(); 834 835 if (prefix) 836 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 837 kprintf(fmt, flags, NULL, NULL, ap); 838 839 kprintf_unlock(); 840 841 if (!panicstr) 842 logwakeup(); 843 } 844 845 void 846 aprint_verbose(const char *fmt, ...) 847 { 848 va_list ap; 849 850 va_start(ap, fmt); 851 aprint_verbose_internal(NULL, fmt, ap); 852 va_end(ap); 853 } 854 855 void 856 aprint_verbose_dev(device_t dv, const char *fmt, ...) 857 { 858 va_list ap; 859 860 va_start(ap, fmt); 861 aprint_verbose_internal(device_xname(dv), fmt, ap); 862 va_end(ap); 863 } 864 865 void 866 aprint_verbose_ifnet(struct ifnet *ifp, const char *fmt, ...) 867 { 868 va_list ap; 869 870 va_start(ap, fmt); 871 aprint_verbose_internal(ifp->if_xname, fmt, ap); 872 va_end(ap); 873 } 874 875 /* 876 * aprint_debug: Send to console and log only if AB_DEBUG. 877 */ 878 static void 879 aprint_debug_internal(const char *prefix, const char *fmt, va_list ap) 880 { 881 882 if ((boothowto & AB_DEBUG) == 0) 883 return; 884 885 kprintf_lock(); 886 887 if (prefix) 888 kprintf_internal("%s: ", TOCONS | TOLOG, NULL, NULL, prefix); 889 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 890 891 kprintf_unlock(); 892 } 893 894 void 895 aprint_debug(const char *fmt, ...) 896 { 897 va_list ap; 898 899 va_start(ap, fmt); 900 aprint_debug_internal(NULL, fmt, ap); 901 va_end(ap); 902 } 903 904 void 905 aprint_debug_dev(device_t dv, const char *fmt, ...) 906 { 907 va_list ap; 908 909 va_start(ap, fmt); 910 aprint_debug_internal(device_xname(dv), fmt, ap); 911 va_end(ap); 912 } 913 914 void 915 aprint_debug_ifnet(struct ifnet *ifp, const char *fmt, ...) 916 { 917 va_list ap; 918 919 va_start(ap, fmt); 920 aprint_debug_internal(ifp->if_xname, fmt, ap); 921 va_end(ap); 922 } 923 924 void 925 printf_tolog(const char *fmt, ...) 926 { 927 va_list ap; 928 929 kprintf_lock(); 930 931 va_start(ap, fmt); 932 (void)kprintf(fmt, TOLOG, NULL, NULL, ap); 933 va_end(ap); 934 935 kprintf_unlock(); 936 } 937 938 /* 939 * printf_nolog: Like printf(), but does not send message to the log. 940 */ 941 942 void 943 printf_nolog(const char *fmt, ...) 944 { 945 va_list ap; 946 947 kprintf_lock(); 948 949 va_start(ap, fmt); 950 kprintf(fmt, TOCONS, NULL, NULL, ap); 951 va_end(ap); 952 953 kprintf_unlock(); 954 } 955 956 /* 957 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 958 */ 959 960 /* 961 * printf: print a message to the console and the log 962 */ 963 void 964 printf(const char *fmt, ...) 965 { 966 va_list ap; 967 968 kprintf_lock(); 969 970 va_start(ap, fmt); 971 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 972 va_end(ap); 973 974 kprintf_unlock(); 975 976 if (!panicstr) 977 logwakeup(); 978 } 979 980 /* 981 * vprintf: print a message to the console and the log [already have 982 * va_alist] 983 */ 984 985 void 986 vprintf(const char *fmt, va_list ap) 987 { 988 989 kprintf_lock(); 990 991 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 992 993 kprintf_unlock(); 994 995 if (!panicstr) 996 logwakeup(); 997 } 998 999 /* 1000 * sprintf: print a message to a buffer 1001 */ 1002 int 1003 sprintf(char *bf, const char *fmt, ...) 1004 { 1005 int retval; 1006 va_list ap; 1007 1008 va_start(ap, fmt); 1009 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 1010 va_end(ap); 1011 *(bf + retval) = 0; /* null terminate */ 1012 return(retval); 1013 } 1014 1015 /* 1016 * vsprintf: print a message to a buffer [already have va_alist] 1017 */ 1018 1019 int 1020 vsprintf(char *bf, const char *fmt, va_list ap) 1021 { 1022 int retval; 1023 1024 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 1025 *(bf + retval) = 0; /* null terminate */ 1026 return (retval); 1027 } 1028 1029 /* 1030 * snprintf: print a message to a buffer 1031 */ 1032 int 1033 snprintf(char *bf, size_t size, const char *fmt, ...) 1034 { 1035 int retval; 1036 va_list ap; 1037 char *p; 1038 1039 if (size < 1) 1040 return (-1); 1041 p = bf + size - 1; 1042 va_start(ap, fmt); 1043 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1044 va_end(ap); 1045 *(p) = 0; /* null terminate */ 1046 return(retval); 1047 } 1048 1049 /* 1050 * vsnprintf: print a message to a buffer [already have va_alist] 1051 */ 1052 int 1053 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 1054 { 1055 int retval; 1056 char *p; 1057 1058 if (size < 1) 1059 return (-1); 1060 p = bf + size - 1; 1061 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1062 *(p) = 0; /* null terminate */ 1063 return(retval); 1064 } 1065 1066 /* 1067 * kprintf: scaled down version of printf(3). 1068 * 1069 * this version based on vfprintf() from libc which was derived from 1070 * software contributed to Berkeley by Chris Torek. 1071 * 1072 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 1073 */ 1074 1075 /* 1076 * macros for converting digits to letters and vice versa 1077 */ 1078 #define to_digit(c) ((c) - '0') 1079 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1080 #define to_char(n) ((n) + '0') 1081 1082 /* 1083 * flags used during conversion. 1084 */ 1085 #define ALT 0x001 /* alternate form */ 1086 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1087 #define LADJUST 0x004 /* left adjustment */ 1088 #define LONGDBL 0x008 /* long double; unimplemented */ 1089 #define LONGINT 0x010 /* long integer */ 1090 #define QUADINT 0x020 /* quad integer */ 1091 #define SHORTINT 0x040 /* short integer */ 1092 #define MAXINT 0x080 /* intmax_t */ 1093 #define PTRINT 0x100 /* intptr_t */ 1094 #define SIZEINT 0x200 /* size_t */ 1095 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1096 #define FPT 0x800 /* Floating point number */ 1097 1098 /* 1099 * To extend shorts properly, we need both signed and unsigned 1100 * argument extraction methods. 1101 */ 1102 #define SARG() \ 1103 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1104 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1105 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1106 flags&QUADINT ? va_arg(ap, quad_t) : \ 1107 flags&LONGINT ? va_arg(ap, long) : \ 1108 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1109 (long)va_arg(ap, int)) 1110 #define UARG() \ 1111 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1112 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1113 flags&SIZEINT ? va_arg(ap, size_t) : \ 1114 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1115 flags&LONGINT ? va_arg(ap, u_long) : \ 1116 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1117 (u_long)va_arg(ap, u_int)) 1118 1119 #define KPRINTF_PUTCHAR(C) { \ 1120 if (oflags == TOBUFONLY) { \ 1121 if ((vp != NULL) && (sbuf == tailp)) { \ 1122 ret += 1; /* indicate error */ \ 1123 goto overflow; \ 1124 } \ 1125 *sbuf++ = (C); \ 1126 } else { \ 1127 putchar((C), oflags, (struct tty *)vp); \ 1128 } \ 1129 } 1130 1131 /* 1132 * Guts of kernel printf. Note, we already expect to be in a mutex! 1133 */ 1134 int 1135 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1136 { 1137 const char *fmt; /* format string */ 1138 int ch; /* character from fmt */ 1139 int n; /* handy integer (short term usage) */ 1140 char *cp; /* handy char pointer (short term usage) */ 1141 int flags; /* flags as above */ 1142 int ret; /* return value accumulator */ 1143 int width; /* width from format (%8d), or 0 */ 1144 int prec; /* precision from format (%.3d), or -1 */ 1145 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1146 1147 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1148 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1149 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1150 int realsz; /* field size expanded by dprec */ 1151 int size; /* size of converted field or string */ 1152 const char *xdigs; /* digits for [xX] conversion */ 1153 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1154 char *tailp; /* tail pointer for snprintf */ 1155 1156 tailp = NULL; /* XXX: shutup gcc */ 1157 if (oflags == TOBUFONLY && (vp != NULL)) 1158 tailp = *(char **)vp; 1159 1160 cp = NULL; /* XXX: shutup gcc */ 1161 size = 0; /* XXX: shutup gcc */ 1162 1163 fmt = fmt0; 1164 ret = 0; 1165 1166 xdigs = NULL; /* XXX: shut up gcc warning */ 1167 1168 /* 1169 * Scan the format for conversions (`%' character). 1170 */ 1171 for (;;) { 1172 while (*fmt != '%' && *fmt) { 1173 ret++; 1174 KPRINTF_PUTCHAR(*fmt++); 1175 } 1176 if (*fmt == 0) 1177 goto done; 1178 1179 fmt++; /* skip over '%' */ 1180 1181 flags = 0; 1182 dprec = 0; 1183 width = 0; 1184 prec = -1; 1185 sign = '\0'; 1186 1187 rflag: ch = *fmt++; 1188 reswitch: switch (ch) { 1189 case ' ': 1190 /* 1191 * ``If the space and + flags both appear, the space 1192 * flag will be ignored.'' 1193 * -- ANSI X3J11 1194 */ 1195 if (!sign) 1196 sign = ' '; 1197 goto rflag; 1198 case '#': 1199 flags |= ALT; 1200 goto rflag; 1201 case '*': 1202 /* 1203 * ``A negative field width argument is taken as a 1204 * - flag followed by a positive field width.'' 1205 * -- ANSI X3J11 1206 * They don't exclude field widths read from args. 1207 */ 1208 if ((width = va_arg(ap, int)) >= 0) 1209 goto rflag; 1210 width = -width; 1211 /* FALLTHROUGH */ 1212 case '-': 1213 flags |= LADJUST; 1214 goto rflag; 1215 case '+': 1216 sign = '+'; 1217 goto rflag; 1218 case '.': 1219 if ((ch = *fmt++) == '*') { 1220 n = va_arg(ap, int); 1221 prec = n < 0 ? -1 : n; 1222 goto rflag; 1223 } 1224 n = 0; 1225 while (is_digit(ch)) { 1226 n = 10 * n + to_digit(ch); 1227 ch = *fmt++; 1228 } 1229 prec = n < 0 ? -1 : n; 1230 goto reswitch; 1231 case '0': 1232 /* 1233 * ``Note that 0 is taken as a flag, not as the 1234 * beginning of a field width.'' 1235 * -- ANSI X3J11 1236 */ 1237 flags |= ZEROPAD; 1238 goto rflag; 1239 case '1': case '2': case '3': case '4': 1240 case '5': case '6': case '7': case '8': case '9': 1241 n = 0; 1242 do { 1243 n = 10 * n + to_digit(ch); 1244 ch = *fmt++; 1245 } while (is_digit(ch)); 1246 width = n; 1247 goto reswitch; 1248 case 'h': 1249 flags |= SHORTINT; 1250 goto rflag; 1251 case 'j': 1252 flags |= MAXINT; 1253 goto rflag; 1254 case 'l': 1255 if (*fmt == 'l') { 1256 fmt++; 1257 flags |= QUADINT; 1258 } else { 1259 flags |= LONGINT; 1260 } 1261 goto rflag; 1262 case 'q': 1263 flags |= QUADINT; 1264 goto rflag; 1265 case 't': 1266 flags |= PTRINT; 1267 goto rflag; 1268 case 'z': 1269 flags |= SIZEINT; 1270 goto rflag; 1271 case 'c': 1272 *(cp = bf) = va_arg(ap, int); 1273 size = 1; 1274 sign = '\0'; 1275 break; 1276 case 'D': 1277 flags |= LONGINT; 1278 /*FALLTHROUGH*/ 1279 case 'd': 1280 case 'i': 1281 _uquad = SARG(); 1282 if ((quad_t)_uquad < 0) { 1283 _uquad = -_uquad; 1284 sign = '-'; 1285 } 1286 base = DEC; 1287 goto number; 1288 case 'n': 1289 if (flags & MAXINT) 1290 *va_arg(ap, intmax_t *) = ret; 1291 else if (flags & PTRINT) 1292 *va_arg(ap, intptr_t *) = ret; 1293 else if (flags & SIZEINT) 1294 *va_arg(ap, ssize_t *) = ret; 1295 else if (flags & QUADINT) 1296 *va_arg(ap, quad_t *) = ret; 1297 else if (flags & LONGINT) 1298 *va_arg(ap, long *) = ret; 1299 else if (flags & SHORTINT) 1300 *va_arg(ap, short *) = ret; 1301 else 1302 *va_arg(ap, int *) = ret; 1303 continue; /* no output */ 1304 case 'O': 1305 flags |= LONGINT; 1306 /*FALLTHROUGH*/ 1307 case 'o': 1308 _uquad = UARG(); 1309 base = OCT; 1310 goto nosign; 1311 case 'p': 1312 /* 1313 * ``The argument shall be a pointer to void. The 1314 * value of the pointer is converted to a sequence 1315 * of printable characters, in an implementation- 1316 * defined manner.'' 1317 * -- ANSI X3J11 1318 */ 1319 /* NOSTRICT */ 1320 _uquad = (u_long)va_arg(ap, void *); 1321 base = HEX; 1322 xdigs = hexdigits; 1323 flags |= HEXPREFIX; 1324 ch = 'x'; 1325 goto nosign; 1326 case 's': 1327 if ((cp = va_arg(ap, char *)) == NULL) 1328 /*XXXUNCONST*/ 1329 cp = __UNCONST("(null)"); 1330 if (prec >= 0) { 1331 /* 1332 * can't use strlen; can only look for the 1333 * NUL in the first `prec' characters, and 1334 * strlen() will go further. 1335 */ 1336 char *p = memchr(cp, 0, prec); 1337 1338 if (p != NULL) { 1339 size = p - cp; 1340 if (size > prec) 1341 size = prec; 1342 } else 1343 size = prec; 1344 } else 1345 size = strlen(cp); 1346 sign = '\0'; 1347 break; 1348 case 'U': 1349 flags |= LONGINT; 1350 /*FALLTHROUGH*/ 1351 case 'u': 1352 _uquad = UARG(); 1353 base = DEC; 1354 goto nosign; 1355 case 'X': 1356 xdigs = HEXDIGITS; 1357 goto hex; 1358 case 'x': 1359 xdigs = hexdigits; 1360 hex: _uquad = UARG(); 1361 base = HEX; 1362 /* leading 0x/X only if non-zero */ 1363 if (flags & ALT && _uquad != 0) 1364 flags |= HEXPREFIX; 1365 1366 /* unsigned conversions */ 1367 nosign: sign = '\0'; 1368 /* 1369 * ``... diouXx conversions ... if a precision is 1370 * specified, the 0 flag will be ignored.'' 1371 * -- ANSI X3J11 1372 */ 1373 number: if ((dprec = prec) >= 0) 1374 flags &= ~ZEROPAD; 1375 1376 /* 1377 * ``The result of converting a zero value with an 1378 * explicit precision of zero is no characters.'' 1379 * -- ANSI X3J11 1380 */ 1381 cp = bf + KPRINTF_BUFSIZE; 1382 if (_uquad != 0 || prec != 0) { 1383 /* 1384 * Unsigned mod is hard, and unsigned mod 1385 * by a constant is easier than that by 1386 * a variable; hence this switch. 1387 */ 1388 switch (base) { 1389 case OCT: 1390 do { 1391 *--cp = to_char(_uquad & 7); 1392 _uquad >>= 3; 1393 } while (_uquad); 1394 /* handle octal leading 0 */ 1395 if (flags & ALT && *cp != '0') 1396 *--cp = '0'; 1397 break; 1398 1399 case DEC: 1400 /* many numbers are 1 digit */ 1401 while (_uquad >= 10) { 1402 *--cp = to_char(_uquad % 10); 1403 _uquad /= 10; 1404 } 1405 *--cp = to_char(_uquad); 1406 break; 1407 1408 case HEX: 1409 do { 1410 *--cp = xdigs[_uquad & 15]; 1411 _uquad >>= 4; 1412 } while (_uquad); 1413 break; 1414 1415 default: 1416 /*XXXUNCONST*/ 1417 cp = __UNCONST("bug in kprintf: bad base"); 1418 size = strlen(cp); 1419 goto skipsize; 1420 } 1421 } 1422 size = bf + KPRINTF_BUFSIZE - cp; 1423 skipsize: 1424 break; 1425 default: /* "%?" prints ?, unless ? is NUL */ 1426 if (ch == '\0') 1427 goto done; 1428 /* pretend it was %c with argument ch */ 1429 cp = bf; 1430 *cp = ch; 1431 size = 1; 1432 sign = '\0'; 1433 break; 1434 } 1435 1436 /* 1437 * All reasonable formats wind up here. At this point, `cp' 1438 * points to a string which (if not flags&LADJUST) should be 1439 * padded out to `width' places. If flags&ZEROPAD, it should 1440 * first be prefixed by any sign or other prefix; otherwise, 1441 * it should be blank padded before the prefix is emitted. 1442 * After any left-hand padding and prefixing, emit zeroes 1443 * required by a decimal [diouxX] precision, then print the 1444 * string proper, then emit zeroes required by any leftover 1445 * floating precision; finally, if LADJUST, pad with blanks. 1446 * 1447 * Compute actual size, so we know how much to pad. 1448 * size excludes decimal prec; realsz includes it. 1449 */ 1450 realsz = dprec > size ? dprec : size; 1451 if (sign) 1452 realsz++; 1453 else if (flags & HEXPREFIX) 1454 realsz+= 2; 1455 1456 /* adjust ret */ 1457 ret += width > realsz ? width : realsz; 1458 1459 /* right-adjusting blank padding */ 1460 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1461 n = width - realsz; 1462 while (n-- > 0) 1463 KPRINTF_PUTCHAR(' '); 1464 } 1465 1466 /* prefix */ 1467 if (sign) { 1468 KPRINTF_PUTCHAR(sign); 1469 } else if (flags & HEXPREFIX) { 1470 KPRINTF_PUTCHAR('0'); 1471 KPRINTF_PUTCHAR(ch); 1472 } 1473 1474 /* right-adjusting zero padding */ 1475 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1476 n = width - realsz; 1477 while (n-- > 0) 1478 KPRINTF_PUTCHAR('0'); 1479 } 1480 1481 /* leading zeroes from decimal precision */ 1482 n = dprec - size; 1483 while (n-- > 0) 1484 KPRINTF_PUTCHAR('0'); 1485 1486 /* the string or number proper */ 1487 while (size--) 1488 KPRINTF_PUTCHAR(*cp++); 1489 /* left-adjusting padding (always blank) */ 1490 if (flags & LADJUST) { 1491 n = width - realsz; 1492 while (n-- > 0) 1493 KPRINTF_PUTCHAR(' '); 1494 } 1495 } 1496 1497 done: 1498 if ((oflags == TOBUFONLY) && (vp != NULL)) 1499 *(char **)vp = sbuf; 1500 (*v_flush)(); 1501 overflow: 1502 return (ret); 1503 /* NOTREACHED */ 1504 } 1505
Indexes created Sun Sep 21 18:09:52 GMT 2025