subr_prf.c revision 1.122
1 /* $NetBSD: subr_prf.c,v 1.122 2008/05/19 17:06:02 ad 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 1.122 2008/05/19 17:06:02 ad 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/cpu.h> 65 66 #include <dev/cons.h> 67 68 #include <net/if.h> 69 70 #ifdef DDB 71 #include <ddb/ddbvar.h> 72 #include <machine/db_machdep.h> 73 #include <ddb/db_command.h> 74 #include <ddb/db_interface.h> 75 #endif 76 77 #ifdef IPKDB 78 #include <ipkdb/ipkdb.h> 79 #endif 80 81 struct simplelock kprintf_slock = SIMPLELOCK_INITIALIZER; 82 83 /* 84 * note that stdarg.h and the ansi style va_start macro is used for both 85 * ansi and traditional c complers. 86 * XXX: this requires that stdarg.h define: va_alist and va_dcl 87 */ 88 #include <machine/stdarg.h> 89 90 91 #ifdef KGDB 92 #include <sys/kgdb.h> 93 #endif 94 #ifdef DDB 95 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 96 #endif 97 98 99 /* 100 * defines 101 */ 102 103 104 /* 105 * local prototypes 106 */ 107 108 static void putchar(int, int, struct tty *); 109 110 111 /* 112 * globals 113 */ 114 115 extern struct tty *constty; /* pointer to console "window" tty */ 116 extern int log_open; /* subr_log: is /dev/klog open? */ 117 const char *panicstr; /* arg to first call to panic (used as a flag 118 to indicate that panic has already been called). */ 119 struct cpu_info *paniccpu; /* cpu that first paniced */ 120 long panicstart, panicend; /* position in the msgbuf of the start and 121 end of the formatted panicstr. */ 122 int doing_shutdown; /* set to indicate shutdown in progress */ 123 124 #ifndef DUMP_ON_PANIC 125 #define DUMP_ON_PANIC 1 126 #endif 127 int dumponpanic = DUMP_ON_PANIC; 128 129 /* 130 * v_putc: routine to putc on virtual console 131 * 132 * the v_putc pointer can be used to redirect the console cnputc elsewhere 133 * [e.g. to a "virtual console"]. 134 */ 135 136 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 137 void (*v_flush)(void) = cnflush; /* start with cnflush (normal cons) */ 138 139 const char hexdigits[] = "0123456789abcdef"; 140 const char HEXDIGITS[] = "0123456789ABCDEF"; 141 142 143 /* 144 * functions 145 */ 146 147 /* 148 * twiddle: spin a little propellor on the console. 149 */ 150 151 void 152 twiddle(void) 153 { 154 static const char twiddle_chars[] = "|/-\\"; 155 static int pos; 156 int s; 157 158 KPRINTF_MUTEX_ENTER(s); 159 160 putchar(twiddle_chars[pos++ & 3], TOCONS, NULL); 161 putchar('\b', TOCONS, NULL); 162 163 KPRINTF_MUTEX_EXIT(s); 164 } 165 166 /* 167 * panic: handle an unresolvable fatal error 168 * 169 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 170 * call) we avoid trying to sync the disk and just reboot (to avoid 171 * recursive panics). 172 */ 173 174 void 175 panic(const char *fmt, ...) 176 { 177 CPU_INFO_ITERATOR cii; 178 struct cpu_info *ci, *oci; 179 int bootopt; 180 va_list ap; 181 182 /* 183 * Disable preemption. If already panicing on another CPU, sit 184 * here and spin until the system is rebooted. Allow the CPU that 185 * first paniced to panic again. 186 */ 187 kpreempt_disable(); 188 ci = curcpu(); 189 oci = atomic_cas_ptr((void *)&paniccpu, NULL, ci); 190 if (oci != NULL && oci != ci) { 191 /* Give interrupts a chance to try and prevent deadlock. */ 192 for (;;) { 193 DELAY(10); 194 } 195 } 196 197 /* 198 * Convert the current thread to a bound thread and prevent all 199 * CPUs from scheduling unbound jobs. Do so without taking any 200 * locks. 201 */ 202 curlwp->l_pflag |= LP_BOUND; 203 for (CPU_INFO_FOREACH(cii, ci)) { 204 ci->ci_schedstate.spc_flags |= SPCF_OFFLINE; 205 } 206 207 bootopt = RB_AUTOBOOT; 208 if (dumponpanic) 209 bootopt |= RB_DUMP; 210 if (doing_shutdown) 211 bootopt |= RB_NOSYNC; 212 if (!panicstr) 213 panicstr = fmt; 214 doing_shutdown = 1; 215 216 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 217 panicstart = msgbufp->msg_bufx; 218 219 va_start(ap, fmt); 220 printf("panic: "); 221 vprintf(fmt, ap); 222 printf("\n"); 223 va_end(ap); 224 225 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 226 panicend = msgbufp->msg_bufx; 227 228 #ifdef IPKDB 229 ipkdb_panic(); 230 #endif 231 #ifdef KGDB 232 kgdb_panic(); 233 #endif 234 #ifdef KADB 235 if (boothowto & RB_KDB) 236 kdbpanic(); 237 #endif 238 #ifdef DDB 239 if (db_onpanic == 1) 240 Debugger(); 241 else if (db_onpanic >= 0) { 242 static int intrace = 0; 243 244 if (intrace == 0) { 245 intrace = 1; 246 printf("Begin traceback...\n"); 247 db_stack_trace_print( 248 (db_expr_t)(intptr_t)__builtin_frame_address(0), 249 true, 65535, "", printf); 250 printf("End traceback...\n"); 251 intrace = 0; 252 } else 253 printf("Faulted in mid-traceback; aborting..."); 254 if (db_onpanic == 2) 255 Debugger(); 256 } 257 #endif 258 cpu_reboot(bootopt, NULL); 259 } 260 261 /* 262 * kernel logging functions: log, logpri, addlog 263 */ 264 265 /* 266 * log: write to the log buffer 267 * 268 * => will not sleep [so safe to call from interrupt] 269 * => will log to console if /dev/klog isn't open 270 */ 271 272 void 273 log(int level, const char *fmt, ...) 274 { 275 int s; 276 va_list ap; 277 278 KPRINTF_MUTEX_ENTER(s); 279 280 klogpri(level); /* log the level first */ 281 va_start(ap, fmt); 282 kprintf(fmt, TOLOG, NULL, NULL, ap); 283 va_end(ap); 284 if (!log_open) { 285 va_start(ap, fmt); 286 kprintf(fmt, TOCONS, NULL, NULL, ap); 287 va_end(ap); 288 } 289 290 KPRINTF_MUTEX_EXIT(s); 291 292 logwakeup(); /* wake up anyone waiting for log msgs */ 293 } 294 295 /* 296 * vlog: write to the log buffer [already have va_alist] 297 */ 298 299 void 300 vlog(int level, const char *fmt, va_list ap) 301 { 302 int s; 303 304 KPRINTF_MUTEX_ENTER(s); 305 306 klogpri(level); /* log the level first */ 307 kprintf(fmt, TOLOG, NULL, NULL, ap); 308 if (!log_open) 309 kprintf(fmt, TOCONS, NULL, NULL, ap); 310 311 KPRINTF_MUTEX_EXIT(s); 312 313 logwakeup(); /* wake up anyone waiting for log msgs */ 314 } 315 316 /* 317 * logpri: log the priority level to the klog 318 */ 319 320 void 321 logpri(int level) 322 { 323 int s; 324 325 KPRINTF_MUTEX_ENTER(s); 326 klogpri(level); 327 KPRINTF_MUTEX_EXIT(s); 328 } 329 330 /* 331 * Note: we must be in the mutex here! 332 */ 333 void 334 klogpri(int level) 335 { 336 char *p; 337 char snbuf[KPRINTF_BUFSIZE]; 338 339 putchar('<', TOLOG, NULL); 340 snprintf(snbuf, sizeof(snbuf), "%d", level); 341 for (p = snbuf ; *p ; p++) 342 putchar(*p, TOLOG, NULL); 343 putchar('>', TOLOG, NULL); 344 } 345 346 /* 347 * addlog: add info to previous log message 348 */ 349 350 void 351 addlog(const char *fmt, ...) 352 { 353 int s; 354 va_list ap; 355 356 KPRINTF_MUTEX_ENTER(s); 357 358 va_start(ap, fmt); 359 kprintf(fmt, TOLOG, NULL, NULL, ap); 360 va_end(ap); 361 if (!log_open) { 362 va_start(ap, fmt); 363 kprintf(fmt, TOCONS, NULL, NULL, ap); 364 va_end(ap); 365 } 366 367 KPRINTF_MUTEX_EXIT(s); 368 369 logwakeup(); 370 } 371 372 373 /* 374 * putchar: print a single character on console or user terminal. 375 * 376 * => if console, then the last MSGBUFS chars are saved in msgbuf 377 * for inspection later (e.g. dmesg/syslog) 378 * => we must already be in the mutex! 379 */ 380 static void 381 putchar(int c, int flags, struct tty *tp) 382 { 383 384 if (panicstr) 385 constty = NULL; 386 if ((flags & TOCONS) && tp == NULL && constty) { 387 tp = constty; 388 flags |= TOTTY; 389 } 390 if ((flags & TOTTY) && tp && 391 tputchar(c, flags, tp) < 0 && 392 (flags & TOCONS) && tp == constty) 393 constty = NULL; 394 if ((flags & TOLOG) && 395 c != '\0' && c != '\r' && c != 0177) 396 logputchar(c); 397 if ((flags & TOCONS) && constty == NULL && c != '\0') 398 (*v_putc)(c); 399 #ifdef DDB 400 if (flags & TODDB) 401 db_putchar(c); 402 #endif 403 } 404 405 406 /* 407 * uprintf: print to the controlling tty of the current process 408 * 409 * => we may block if the tty queue is full 410 * => no message is printed if the queue doesn't clear in a reasonable 411 * time 412 */ 413 414 void 415 uprintf(const char *fmt, ...) 416 { 417 struct proc *p = curproc; 418 va_list ap; 419 420 /* mutex_enter(proc_lock); XXXSMP */ 421 422 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 423 /* No mutex needed; going to process TTY. */ 424 va_start(ap, fmt); 425 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 426 va_end(ap); 427 } 428 429 /* mutex_exit(proc_lock); XXXSMP */ 430 } 431 432 void 433 uprintf_locked(const char *fmt, ...) 434 { 435 struct proc *p = curproc; 436 va_list ap; 437 438 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 439 /* No mutex needed; going to process TTY. */ 440 va_start(ap, fmt); 441 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 442 va_end(ap); 443 } 444 } 445 446 /* 447 * tprintf functions: used to send messages to a specific process 448 * 449 * usage: 450 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 451 * use the handle when calling "tprintf" 452 * when done, do a "tprintf_close" to drop the handle 453 */ 454 455 /* 456 * tprintf_open: get a tprintf handle on a process "p" 457 * 458 * => returns NULL if process can't be printed to 459 */ 460 461 tpr_t 462 tprintf_open(struct proc *p) 463 { 464 tpr_t cookie; 465 466 cookie = NULL; 467 468 mutex_enter(proc_lock); 469 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 470 SESSHOLD(p->p_session); 471 cookie = (tpr_t)p->p_session; 472 } 473 mutex_exit(proc_lock); 474 475 return cookie; 476 } 477 478 /* 479 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 480 */ 481 482 void 483 tprintf_close(tpr_t sess) 484 { 485 486 if (sess) { 487 mutex_enter(proc_lock); 488 SESSRELE((struct session *) sess); 489 mutex_exit(proc_lock); 490 } 491 } 492 493 /* 494 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 495 * send a message to the controlling tty for that process. 496 * 497 * => also sends message to /dev/klog 498 */ 499 void 500 tprintf(tpr_t tpr, const char *fmt, ...) 501 { 502 struct session *sess = (struct session *)tpr; 503 struct tty *tp = NULL; 504 int s, flags = TOLOG; 505 va_list ap; 506 507 /* mutex_enter(proc_lock); XXXSMP */ 508 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 509 flags |= TOTTY; 510 tp = sess->s_ttyp; 511 } 512 513 KPRINTF_MUTEX_ENTER(s); 514 515 klogpri(LOG_INFO); 516 va_start(ap, fmt); 517 kprintf(fmt, flags, tp, NULL, ap); 518 va_end(ap); 519 520 KPRINTF_MUTEX_EXIT(s); 521 /* mutex_exit(proc_lock); XXXSMP */ 522 523 logwakeup(); 524 } 525 526 527 /* 528 * ttyprintf: send a message to a specific tty 529 * 530 * => should be used only by tty driver or anything that knows the 531 * underlying tty will not be revoked(2)'d away. [otherwise, 532 * use tprintf] 533 */ 534 void 535 ttyprintf(struct tty *tp, const char *fmt, ...) 536 { 537 va_list ap; 538 539 /* No mutex needed; going to process TTY. */ 540 va_start(ap, fmt); 541 kprintf(fmt, TOTTY, tp, NULL, ap); 542 va_end(ap); 543 } 544 545 #ifdef DDB 546 547 /* 548 * db_printf: printf for DDB (via db_putchar) 549 */ 550 551 void 552 db_printf(const char *fmt, ...) 553 { 554 va_list ap; 555 556 /* No mutex needed; DDB pauses all processors. */ 557 va_start(ap, fmt); 558 kprintf(fmt, TODDB, NULL, NULL, ap); 559 va_end(ap); 560 561 if (db_tee_msgbuf) { 562 va_start(ap, fmt); 563 kprintf(fmt, TOLOG, NULL, NULL, ap); 564 va_end(ap); 565 }; 566 } 567 568 void 569 db_vprintf(const char *fmt, va_list ap) 570 { 571 572 /* No mutex needed; DDB pauses all processors. */ 573 kprintf(fmt, TODDB, NULL, NULL, ap); 574 if (db_tee_msgbuf) 575 kprintf(fmt, TOLOG, NULL, NULL, ap); 576 } 577 578 #endif /* DDB */ 579 580 static void 581 kprintf_internal(const char *fmt, int oflags, void *vp, char *sbuf, ...) 582 { 583 va_list ap; 584 585 va_start(ap, sbuf); 586 (void)kprintf(fmt, oflags, vp, sbuf, ap); 587 va_end(ap); 588 } 589 590 /* 591 * Device autoconfiguration printf routines. These change their 592 * behavior based on the AB_* flags in boothowto. If AB_SILENT 593 * is set, messages never go to the console (but they still always 594 * go to the log). AB_VERBOSE overrides AB_SILENT. 595 */ 596 597 /* 598 * aprint_normal: Send to console unless AB_QUIET. Always goes 599 * to the log. 600 */ 601 static void 602 aprint_normal_internal(const char *prefix, const char *fmt, va_list ap) 603 { 604 int s, flags = TOLOG; 605 606 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 607 (boothowto & AB_VERBOSE) != 0) 608 flags |= TOCONS; 609 610 KPRINTF_MUTEX_ENTER(s); 611 612 if (prefix) 613 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 614 kprintf(fmt, flags, NULL, NULL, ap); 615 616 KPRINTF_MUTEX_EXIT(s); 617 618 if (!panicstr) 619 logwakeup(); 620 } 621 622 void 623 aprint_normal(const char *fmt, ...) 624 { 625 va_list ap; 626 627 va_start(ap, fmt); 628 aprint_normal_internal(NULL, fmt, ap); 629 va_end(ap); 630 } 631 632 void 633 aprint_normal_dev(device_t dv, const char *fmt, ...) 634 { 635 va_list ap; 636 637 va_start(ap, fmt); 638 aprint_normal_internal(device_xname(dv), fmt, ap); 639 va_end(ap); 640 } 641 642 void 643 aprint_normal_ifnet(struct ifnet *ifp, const char *fmt, ...) 644 { 645 va_list ap; 646 647 va_start(ap, fmt); 648 aprint_normal_internal(ifp->if_xname, fmt, ap); 649 va_end(ap); 650 } 651 652 /* 653 * aprint_error: Send to console unless AB_QUIET. Always goes 654 * to the log. Also counts the number of times called so other 655 * parts of the kernel can report the number of errors during a 656 * given phase of system startup. 657 */ 658 static int aprint_error_count; 659 660 int 661 aprint_get_error_count(void) 662 { 663 int count, s; 664 665 KPRINTF_MUTEX_ENTER(s); 666 667 count = aprint_error_count; 668 aprint_error_count = 0; 669 670 KPRINTF_MUTEX_EXIT(s); 671 672 return (count); 673 } 674 675 static void 676 aprint_error_internal(const char *prefix, const char *fmt, va_list ap) 677 { 678 int s, flags = TOLOG; 679 680 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 681 (boothowto & AB_VERBOSE) != 0) 682 flags |= TOCONS; 683 684 KPRINTF_MUTEX_ENTER(s); 685 686 aprint_error_count++; 687 688 if (prefix) 689 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 690 kprintf(fmt, flags, NULL, NULL, ap); 691 692 KPRINTF_MUTEX_EXIT(s); 693 694 if (!panicstr) 695 logwakeup(); 696 } 697 698 void 699 aprint_error(const char *fmt, ...) 700 { 701 va_list ap; 702 703 va_start(ap, fmt); 704 aprint_error_internal(NULL, fmt, ap); 705 va_end(ap); 706 } 707 708 void 709 aprint_error_dev(device_t dv, const char *fmt, ...) 710 { 711 va_list ap; 712 713 va_start(ap, fmt); 714 aprint_error_internal(device_xname(dv), fmt, ap); 715 va_end(ap); 716 } 717 718 void 719 aprint_error_ifnet(struct ifnet *ifp, const char *fmt, ...) 720 { 721 va_list ap; 722 723 va_start(ap, fmt); 724 aprint_error_internal(ifp->if_xname, fmt, ap); 725 va_end(ap); 726 } 727 728 /* 729 * aprint_naive: Send to console only if AB_QUIET. Never goes 730 * to the log. 731 */ 732 static void 733 aprint_naive_internal(const char *prefix, const char *fmt, va_list ap) 734 { 735 int s; 736 737 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET) 738 return; 739 740 KPRINTF_MUTEX_ENTER(s); 741 742 if (prefix) 743 kprintf_internal("%s: ", TOCONS, NULL, NULL, prefix); 744 kprintf(fmt, TOCONS, NULL, NULL, ap); 745 746 KPRINTF_MUTEX_EXIT(s); 747 } 748 749 void 750 aprint_naive(const char *fmt, ...) 751 { 752 va_list ap; 753 754 va_start(ap, fmt); 755 aprint_naive_internal(NULL, fmt, ap); 756 va_end(ap); 757 } 758 759 void 760 aprint_naive_dev(device_t dv, const char *fmt, ...) 761 { 762 va_list ap; 763 764 va_start(ap, fmt); 765 aprint_naive_internal(device_xname(dv), fmt, ap); 766 va_end(ap); 767 } 768 769 void 770 aprint_naive_ifnet(struct ifnet *ifp, const char *fmt, ...) 771 { 772 va_list ap; 773 774 va_start(ap, fmt); 775 aprint_naive_internal(ifp->if_xname, fmt, ap); 776 va_end(ap); 777 } 778 779 /* 780 * aprint_verbose: Send to console only if AB_VERBOSE. Always 781 * goes to the log. 782 */ 783 static void 784 aprint_verbose_internal(const char *prefix, const char *fmt, va_list ap) 785 { 786 int s, flags = TOLOG; 787 788 if (boothowto & AB_VERBOSE) 789 flags |= TOCONS; 790 791 KPRINTF_MUTEX_ENTER(s); 792 793 if (prefix) 794 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 795 kprintf(fmt, flags, NULL, NULL, ap); 796 797 KPRINTF_MUTEX_EXIT(s); 798 799 if (!panicstr) 800 logwakeup(); 801 } 802 803 void 804 aprint_verbose(const char *fmt, ...) 805 { 806 va_list ap; 807 808 va_start(ap, fmt); 809 aprint_verbose_internal(NULL, fmt, ap); 810 va_end(ap); 811 } 812 813 void 814 aprint_verbose_dev(device_t dv, const char *fmt, ...) 815 { 816 va_list ap; 817 818 va_start(ap, fmt); 819 aprint_verbose_internal(device_xname(dv), fmt, ap); 820 va_end(ap); 821 } 822 823 void 824 aprint_verbose_ifnet(struct ifnet *ifp, const char *fmt, ...) 825 { 826 va_list ap; 827 828 va_start(ap, fmt); 829 aprint_verbose_internal(ifp->if_xname, fmt, ap); 830 va_end(ap); 831 } 832 833 /* 834 * aprint_debug: Send to console and log only if AB_DEBUG. 835 */ 836 static void 837 aprint_debug_internal(const char *prefix, const char *fmt, va_list ap) 838 { 839 int s; 840 841 if ((boothowto & AB_DEBUG) == 0) 842 return; 843 844 KPRINTF_MUTEX_ENTER(s); 845 846 if (prefix) 847 kprintf_internal("%s: ", TOCONS | TOLOG, NULL, NULL, prefix); 848 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 849 850 KPRINTF_MUTEX_EXIT(s); 851 } 852 853 void 854 aprint_debug(const char *fmt, ...) 855 { 856 va_list ap; 857 858 va_start(ap, fmt); 859 aprint_debug_internal(NULL, fmt, ap); 860 va_end(ap); 861 } 862 863 void 864 aprint_debug_dev(device_t dv, const char *fmt, ...) 865 { 866 va_list ap; 867 868 va_start(ap, fmt); 869 aprint_debug_internal(device_xname(dv), fmt, ap); 870 va_end(ap); 871 } 872 873 void 874 aprint_debug_ifnet(struct ifnet *ifp, const char *fmt, ...) 875 { 876 va_list ap; 877 878 va_start(ap, fmt); 879 aprint_debug_internal(ifp->if_xname, fmt, ap); 880 va_end(ap); 881 } 882 883 /* 884 * printf_nolog: Like printf(), but does not send message to the log. 885 */ 886 887 void 888 printf_nolog(const char *fmt, ...) 889 { 890 va_list ap; 891 int s; 892 893 KPRINTF_MUTEX_ENTER(s); 894 895 va_start(ap, fmt); 896 kprintf(fmt, TOCONS, NULL, NULL, ap); 897 va_end(ap); 898 899 KPRINTF_MUTEX_EXIT(s); 900 } 901 902 /* 903 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 904 */ 905 906 /* 907 * printf: print a message to the console and the log 908 */ 909 void 910 printf(const char *fmt, ...) 911 { 912 va_list ap; 913 int s; 914 915 KPRINTF_MUTEX_ENTER(s); 916 917 va_start(ap, fmt); 918 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 919 va_end(ap); 920 921 KPRINTF_MUTEX_EXIT(s); 922 923 if (!panicstr) 924 logwakeup(); 925 } 926 927 /* 928 * vprintf: print a message to the console and the log [already have 929 * va_alist] 930 */ 931 932 void 933 vprintf(const char *fmt, va_list ap) 934 { 935 int s; 936 937 KPRINTF_MUTEX_ENTER(s); 938 939 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 940 941 KPRINTF_MUTEX_EXIT(s); 942 943 if (!panicstr) 944 logwakeup(); 945 } 946 947 /* 948 * sprintf: print a message to a buffer 949 */ 950 int 951 sprintf(char *bf, const char *fmt, ...) 952 { 953 int retval; 954 va_list ap; 955 956 va_start(ap, fmt); 957 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 958 va_end(ap); 959 *(bf + retval) = 0; /* null terminate */ 960 return(retval); 961 } 962 963 /* 964 * vsprintf: print a message to a buffer [already have va_alist] 965 */ 966 967 int 968 vsprintf(char *bf, const char *fmt, va_list ap) 969 { 970 int retval; 971 972 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 973 *(bf + retval) = 0; /* null terminate */ 974 return (retval); 975 } 976 977 /* 978 * snprintf: print a message to a buffer 979 */ 980 int 981 snprintf(char *bf, size_t size, const char *fmt, ...) 982 { 983 int retval; 984 va_list ap; 985 char *p; 986 987 if (size < 1) 988 return (-1); 989 p = bf + size - 1; 990 va_start(ap, fmt); 991 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 992 va_end(ap); 993 *(p) = 0; /* null terminate */ 994 return(retval); 995 } 996 997 /* 998 * vsnprintf: print a message to a buffer [already have va_alist] 999 */ 1000 int 1001 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 1002 { 1003 int retval; 1004 char *p; 1005 1006 if (size < 1) 1007 return (-1); 1008 p = bf + size - 1; 1009 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1010 *(p) = 0; /* null terminate */ 1011 return(retval); 1012 } 1013 1014 /* 1015 * kprintf: scaled down version of printf(3). 1016 * 1017 * this version based on vfprintf() from libc which was derived from 1018 * software contributed to Berkeley by Chris Torek. 1019 * 1020 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 1021 */ 1022 1023 /* 1024 * macros for converting digits to letters and vice versa 1025 */ 1026 #define to_digit(c) ((c) - '0') 1027 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1028 #define to_char(n) ((n) + '0') 1029 1030 /* 1031 * flags used during conversion. 1032 */ 1033 #define ALT 0x001 /* alternate form */ 1034 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1035 #define LADJUST 0x004 /* left adjustment */ 1036 #define LONGDBL 0x008 /* long double; unimplemented */ 1037 #define LONGINT 0x010 /* long integer */ 1038 #define QUADINT 0x020 /* quad integer */ 1039 #define SHORTINT 0x040 /* short integer */ 1040 #define MAXINT 0x080 /* intmax_t */ 1041 #define PTRINT 0x100 /* intptr_t */ 1042 #define SIZEINT 0x200 /* size_t */ 1043 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1044 #define FPT 0x800 /* Floating point number */ 1045 1046 /* 1047 * To extend shorts properly, we need both signed and unsigned 1048 * argument extraction methods. 1049 */ 1050 #define SARG() \ 1051 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1052 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1053 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1054 flags&QUADINT ? va_arg(ap, quad_t) : \ 1055 flags&LONGINT ? va_arg(ap, long) : \ 1056 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1057 (long)va_arg(ap, int)) 1058 #define UARG() \ 1059 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1060 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1061 flags&SIZEINT ? va_arg(ap, size_t) : \ 1062 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1063 flags&LONGINT ? va_arg(ap, u_long) : \ 1064 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1065 (u_long)va_arg(ap, u_int)) 1066 1067 #define KPRINTF_PUTCHAR(C) { \ 1068 if (oflags == TOBUFONLY) { \ 1069 if ((vp != NULL) && (sbuf == tailp)) { \ 1070 ret += 1; /* indicate error */ \ 1071 goto overflow; \ 1072 } \ 1073 *sbuf++ = (C); \ 1074 } else { \ 1075 putchar((C), oflags, (struct tty *)vp); \ 1076 } \ 1077 } 1078 1079 /* 1080 * Guts of kernel printf. Note, we already expect to be in a mutex! 1081 */ 1082 int 1083 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1084 { 1085 const char *fmt; /* format string */ 1086 int ch; /* character from fmt */ 1087 int n; /* handy integer (short term usage) */ 1088 char *cp; /* handy char pointer (short term usage) */ 1089 int flags; /* flags as above */ 1090 int ret; /* return value accumulator */ 1091 int width; /* width from format (%8d), or 0 */ 1092 int prec; /* precision from format (%.3d), or -1 */ 1093 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1094 1095 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1096 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1097 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1098 int realsz; /* field size expanded by dprec */ 1099 int size; /* size of converted field or string */ 1100 const char *xdigs; /* digits for [xX] conversion */ 1101 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1102 char *tailp; /* tail pointer for snprintf */ 1103 1104 tailp = NULL; /* XXX: shutup gcc */ 1105 if (oflags == TOBUFONLY && (vp != NULL)) 1106 tailp = *(char **)vp; 1107 1108 cp = NULL; /* XXX: shutup gcc */ 1109 size = 0; /* XXX: shutup gcc */ 1110 1111 fmt = fmt0; 1112 ret = 0; 1113 1114 xdigs = NULL; /* XXX: shut up gcc warning */ 1115 1116 /* 1117 * Scan the format for conversions (`%' character). 1118 */ 1119 for (;;) { 1120 while (*fmt != '%' && *fmt) { 1121 ret++; 1122 KPRINTF_PUTCHAR(*fmt++); 1123 } 1124 if (*fmt == 0) 1125 goto done; 1126 1127 fmt++; /* skip over '%' */ 1128 1129 flags = 0; 1130 dprec = 0; 1131 width = 0; 1132 prec = -1; 1133 sign = '\0'; 1134 1135 rflag: ch = *fmt++; 1136 reswitch: switch (ch) { 1137 case ' ': 1138 /* 1139 * ``If the space and + flags both appear, the space 1140 * flag will be ignored.'' 1141 * -- ANSI X3J11 1142 */ 1143 if (!sign) 1144 sign = ' '; 1145 goto rflag; 1146 case '#': 1147 flags |= ALT; 1148 goto rflag; 1149 case '*': 1150 /* 1151 * ``A negative field width argument is taken as a 1152 * - flag followed by a positive field width.'' 1153 * -- ANSI X3J11 1154 * They don't exclude field widths read from args. 1155 */ 1156 if ((width = va_arg(ap, int)) >= 0) 1157 goto rflag; 1158 width = -width; 1159 /* FALLTHROUGH */ 1160 case '-': 1161 flags |= LADJUST; 1162 goto rflag; 1163 case '+': 1164 sign = '+'; 1165 goto rflag; 1166 case '.': 1167 if ((ch = *fmt++) == '*') { 1168 n = va_arg(ap, int); 1169 prec = n < 0 ? -1 : n; 1170 goto rflag; 1171 } 1172 n = 0; 1173 while (is_digit(ch)) { 1174 n = 10 * n + to_digit(ch); 1175 ch = *fmt++; 1176 } 1177 prec = n < 0 ? -1 : n; 1178 goto reswitch; 1179 case '0': 1180 /* 1181 * ``Note that 0 is taken as a flag, not as the 1182 * beginning of a field width.'' 1183 * -- ANSI X3J11 1184 */ 1185 flags |= ZEROPAD; 1186 goto rflag; 1187 case '1': case '2': case '3': case '4': 1188 case '5': case '6': case '7': case '8': case '9': 1189 n = 0; 1190 do { 1191 n = 10 * n + to_digit(ch); 1192 ch = *fmt++; 1193 } while (is_digit(ch)); 1194 width = n; 1195 goto reswitch; 1196 case 'h': 1197 flags |= SHORTINT; 1198 goto rflag; 1199 case 'j': 1200 flags |= MAXINT; 1201 goto rflag; 1202 case 'l': 1203 if (*fmt == 'l') { 1204 fmt++; 1205 flags |= QUADINT; 1206 } else { 1207 flags |= LONGINT; 1208 } 1209 goto rflag; 1210 case 'q': 1211 flags |= QUADINT; 1212 goto rflag; 1213 case 't': 1214 flags |= PTRINT; 1215 goto rflag; 1216 case 'z': 1217 flags |= SIZEINT; 1218 goto rflag; 1219 case 'c': 1220 *(cp = bf) = va_arg(ap, int); 1221 size = 1; 1222 sign = '\0'; 1223 break; 1224 case 'D': 1225 flags |= LONGINT; 1226 /*FALLTHROUGH*/ 1227 case 'd': 1228 case 'i': 1229 _uquad = SARG(); 1230 if ((quad_t)_uquad < 0) { 1231 _uquad = -_uquad; 1232 sign = '-'; 1233 } 1234 base = DEC; 1235 goto number; 1236 case 'n': 1237 if (flags & MAXINT) 1238 *va_arg(ap, intmax_t *) = ret; 1239 else if (flags & PTRINT) 1240 *va_arg(ap, intptr_t *) = ret; 1241 else if (flags & SIZEINT) 1242 *va_arg(ap, ssize_t *) = ret; 1243 else if (flags & QUADINT) 1244 *va_arg(ap, quad_t *) = ret; 1245 else if (flags & LONGINT) 1246 *va_arg(ap, long *) = ret; 1247 else if (flags & SHORTINT) 1248 *va_arg(ap, short *) = ret; 1249 else 1250 *va_arg(ap, int *) = ret; 1251 continue; /* no output */ 1252 case 'O': 1253 flags |= LONGINT; 1254 /*FALLTHROUGH*/ 1255 case 'o': 1256 _uquad = UARG(); 1257 base = OCT; 1258 goto nosign; 1259 case 'p': 1260 /* 1261 * ``The argument shall be a pointer to void. The 1262 * value of the pointer is converted to a sequence 1263 * of printable characters, in an implementation- 1264 * defined manner.'' 1265 * -- ANSI X3J11 1266 */ 1267 /* NOSTRICT */ 1268 _uquad = (u_long)va_arg(ap, void *); 1269 base = HEX; 1270 xdigs = hexdigits; 1271 flags |= HEXPREFIX; 1272 ch = 'x'; 1273 goto nosign; 1274 case 's': 1275 if ((cp = va_arg(ap, char *)) == NULL) 1276 /*XXXUNCONST*/ 1277 cp = __UNCONST("(null)"); 1278 if (prec >= 0) { 1279 /* 1280 * can't use strlen; can only look for the 1281 * NUL in the first `prec' characters, and 1282 * strlen() will go further. 1283 */ 1284 char *p = memchr(cp, 0, prec); 1285 1286 if (p != NULL) { 1287 size = p - cp; 1288 if (size > prec) 1289 size = prec; 1290 } else 1291 size = prec; 1292 } else 1293 size = strlen(cp); 1294 sign = '\0'; 1295 break; 1296 case 'U': 1297 flags |= LONGINT; 1298 /*FALLTHROUGH*/ 1299 case 'u': 1300 _uquad = UARG(); 1301 base = DEC; 1302 goto nosign; 1303 case 'X': 1304 xdigs = HEXDIGITS; 1305 goto hex; 1306 case 'x': 1307 xdigs = hexdigits; 1308 hex: _uquad = UARG(); 1309 base = HEX; 1310 /* leading 0x/X only if non-zero */ 1311 if (flags & ALT && _uquad != 0) 1312 flags |= HEXPREFIX; 1313 1314 /* unsigned conversions */ 1315 nosign: sign = '\0'; 1316 /* 1317 * ``... diouXx conversions ... if a precision is 1318 * specified, the 0 flag will be ignored.'' 1319 * -- ANSI X3J11 1320 */ 1321 number: if ((dprec = prec) >= 0) 1322 flags &= ~ZEROPAD; 1323 1324 /* 1325 * ``The result of converting a zero value with an 1326 * explicit precision of zero is no characters.'' 1327 * -- ANSI X3J11 1328 */ 1329 cp = bf + KPRINTF_BUFSIZE; 1330 if (_uquad != 0 || prec != 0) { 1331 /* 1332 * Unsigned mod is hard, and unsigned mod 1333 * by a constant is easier than that by 1334 * a variable; hence this switch. 1335 */ 1336 switch (base) { 1337 case OCT: 1338 do { 1339 *--cp = to_char(_uquad & 7); 1340 _uquad >>= 3; 1341 } while (_uquad); 1342 /* handle octal leading 0 */ 1343 if (flags & ALT && *cp != '0') 1344 *--cp = '0'; 1345 break; 1346 1347 case DEC: 1348 /* many numbers are 1 digit */ 1349 while (_uquad >= 10) { 1350 *--cp = to_char(_uquad % 10); 1351 _uquad /= 10; 1352 } 1353 *--cp = to_char(_uquad); 1354 break; 1355 1356 case HEX: 1357 do { 1358 *--cp = xdigs[_uquad & 15]; 1359 _uquad >>= 4; 1360 } while (_uquad); 1361 break; 1362 1363 default: 1364 /*XXXUNCONST*/ 1365 cp = __UNCONST("bug in kprintf: bad base"); 1366 size = strlen(cp); 1367 goto skipsize; 1368 } 1369 } 1370 size = bf + KPRINTF_BUFSIZE - cp; 1371 skipsize: 1372 break; 1373 default: /* "%?" prints ?, unless ? is NUL */ 1374 if (ch == '\0') 1375 goto done; 1376 /* pretend it was %c with argument ch */ 1377 cp = bf; 1378 *cp = ch; 1379 size = 1; 1380 sign = '\0'; 1381 break; 1382 } 1383 1384 /* 1385 * All reasonable formats wind up here. At this point, `cp' 1386 * points to a string which (if not flags&LADJUST) should be 1387 * padded out to `width' places. If flags&ZEROPAD, it should 1388 * first be prefixed by any sign or other prefix; otherwise, 1389 * it should be blank padded before the prefix is emitted. 1390 * After any left-hand padding and prefixing, emit zeroes 1391 * required by a decimal [diouxX] precision, then print the 1392 * string proper, then emit zeroes required by any leftover 1393 * floating precision; finally, if LADJUST, pad with blanks. 1394 * 1395 * Compute actual size, so we know how much to pad. 1396 * size excludes decimal prec; realsz includes it. 1397 */ 1398 realsz = dprec > size ? dprec : size; 1399 if (sign) 1400 realsz++; 1401 else if (flags & HEXPREFIX) 1402 realsz+= 2; 1403 1404 /* adjust ret */ 1405 ret += width > realsz ? width : realsz; 1406 1407 /* right-adjusting blank padding */ 1408 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1409 n = width - realsz; 1410 while (n-- > 0) 1411 KPRINTF_PUTCHAR(' '); 1412 } 1413 1414 /* prefix */ 1415 if (sign) { 1416 KPRINTF_PUTCHAR(sign); 1417 } else if (flags & HEXPREFIX) { 1418 KPRINTF_PUTCHAR('0'); 1419 KPRINTF_PUTCHAR(ch); 1420 } 1421 1422 /* right-adjusting zero padding */ 1423 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1424 n = width - realsz; 1425 while (n-- > 0) 1426 KPRINTF_PUTCHAR('0'); 1427 } 1428 1429 /* leading zeroes from decimal precision */ 1430 n = dprec - size; 1431 while (n-- > 0) 1432 KPRINTF_PUTCHAR('0'); 1433 1434 /* the string or number proper */ 1435 while (size--) 1436 KPRINTF_PUTCHAR(*cp++); 1437 /* left-adjusting padding (always blank) */ 1438 if (flags & LADJUST) { 1439 n = width - realsz; 1440 while (n-- > 0) 1441 KPRINTF_PUTCHAR(' '); 1442 } 1443 } 1444 1445 done: 1446 if ((oflags == TOBUFONLY) && (vp != NULL)) 1447 *(char **)vp = sbuf; 1448 (*v_flush)(); 1449 overflow: 1450 return (ret); 1451 /* NOTREACHED */ 1452 } 1453
Indexes created Mon Sep 22 05:09:51 GMT 2025