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sys/kern/subr_prf.c
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1 /* $NetBSD: subr_prf.c,v 1.94 2004/03/23 13:22:04 junyoung 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 1.94 2004/03/23 13:22:04 junyoung Exp $"); 41 42 #include "opt_ddb.h" 43 #include "opt_ipkdb.h" 44 #include "opt_kgdb.h" 45 #include "opt_multiprocessor.h" 46 #include "opt_dump.h" 47 48 #include <sys/param.h> 49 #include <sys/stdint.h> 50 #include <sys/systm.h> 51 #include <sys/buf.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/lock.h> 63 #include <sys/kprintf.h> 64 65 #include <dev/cons.h> 66 67 #ifdef DDB 68 #include <ddb/ddbvar.h> 69 #include <machine/db_machdep.h> 70 #include <ddb/db_command.h> 71 #include <ddb/db_interface.h> 72 #endif 73 74 #ifdef IPKDB 75 #include <ipkdb/ipkdb.h> 76 #endif 77 78 #if defined(MULTIPROCESSOR) 79 struct simplelock kprintf_slock = SIMPLELOCK_INITIALIZER; 80 #endif /* MULTIPROCESSOR */ 81 82 /* 83 * note that stdarg.h and the ansi style va_start macro is used for both 84 * ansi and traditional c complers. 85 * XXX: this requires that stdarg.h define: va_alist and va_dcl 86 */ 87 #include <machine/stdarg.h> 88 89 90 #ifdef KGDB 91 #include <sys/kgdb.h> 92 #include <machine/cpu.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 /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ 104 #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) 105 106 107 /* 108 * local prototypes 109 */ 110 111 static void putchar(int, int, struct tty *); 112 113 114 /* 115 * globals 116 */ 117 118 extern struct tty *constty; /* pointer to console "window" tty */ 119 extern int log_open; /* subr_log: is /dev/klog open? */ 120 const char *panicstr; /* arg to first call to panic (used as a flag 121 to indicate that panic has already been called). */ 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) */ 140 141 142 /* 143 * functions 144 */ 145 146 /* 147 * tablefull: warn that a system table is full 148 */ 149 150 void 151 tablefull(tab, hint) 152 const char *tab, *hint; 153 { 154 if (hint) 155 log(LOG_ERR, "%s: table is full - %s\n", tab, hint); 156 else 157 log(LOG_ERR, "%s: table is full\n", tab); 158 } 159 160 /* 161 * twiddle: spin a little propellor on the console. 162 */ 163 164 void 165 twiddle(void) 166 { 167 static const char twiddle_chars[] = "|/-\\"; 168 static int pos; 169 int s; 170 171 KPRINTF_MUTEX_ENTER(s); 172 173 putchar(twiddle_chars[pos++ & 3], TOCONS, NULL); 174 putchar('\b', TOCONS, NULL); 175 176 KPRINTF_MUTEX_EXIT(s); 177 } 178 179 /* 180 * panic: handle an unresolvable fatal error 181 * 182 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 183 * call) we avoid trying to sync the disk and just reboot (to avoid 184 * recursive panics). 185 */ 186 187 void 188 panic(const char *fmt, ...) 189 { 190 int bootopt; 191 va_list ap; 192 193 bootopt = RB_AUTOBOOT; 194 if (dumponpanic) 195 bootopt |= RB_DUMP; 196 if (doing_shutdown) 197 bootopt |= RB_NOSYNC; 198 if (!panicstr) 199 panicstr = fmt; 200 doing_shutdown = 1; 201 202 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 203 panicstart = msgbufp->msg_bufx; 204 205 va_start(ap, fmt); 206 printf("panic: "); 207 vprintf(fmt, ap); 208 printf("\n"); 209 va_end(ap); 210 211 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 212 panicend = msgbufp->msg_bufx; 213 214 #ifdef IPKDB 215 ipkdb_panic(); 216 #endif 217 #ifdef KGDB 218 kgdb_panic(); 219 #endif 220 #ifdef KADB 221 if (boothowto & RB_KDB) 222 kdbpanic(); 223 #endif 224 #ifdef DDB 225 if (db_onpanic) 226 Debugger(); 227 else { 228 static int intrace = 0; 229 230 if (intrace==0) { 231 intrace=1; 232 printf("Begin traceback...\n"); 233 db_stack_trace_print( 234 (db_expr_t)(intptr_t)__builtin_frame_address(0), 235 TRUE, 65535, "", printf); 236 printf("End traceback...\n"); 237 intrace=0; 238 } else 239 printf("Faulted in mid-traceback; aborting..."); 240 } 241 #endif 242 cpu_reboot(bootopt, NULL); 243 } 244 245 /* 246 * kernel logging functions: log, logpri, addlog 247 */ 248 249 /* 250 * log: write to the log buffer 251 * 252 * => will not sleep [so safe to call from interrupt] 253 * => will log to console if /dev/klog isn't open 254 */ 255 256 void 257 log(int level, const char *fmt, ...) 258 { 259 int s; 260 va_list ap; 261 262 KPRINTF_MUTEX_ENTER(s); 263 264 klogpri(level); /* log the level first */ 265 va_start(ap, fmt); 266 kprintf(fmt, TOLOG, NULL, NULL, ap); 267 va_end(ap); 268 if (!log_open) { 269 va_start(ap, fmt); 270 kprintf(fmt, TOCONS, NULL, NULL, ap); 271 va_end(ap); 272 } 273 274 KPRINTF_MUTEX_EXIT(s); 275 276 logwakeup(); /* wake up anyone waiting for log msgs */ 277 } 278 279 /* 280 * vlog: write to the log buffer [already have va_alist] 281 */ 282 283 void 284 vlog(level, fmt, ap) 285 int level; 286 const char *fmt; 287 va_list ap; 288 { 289 int s; 290 291 KPRINTF_MUTEX_ENTER(s); 292 293 klogpri(level); /* log the level first */ 294 kprintf(fmt, TOLOG, NULL, NULL, ap); 295 if (!log_open) 296 kprintf(fmt, TOCONS, NULL, NULL, ap); 297 298 KPRINTF_MUTEX_EXIT(s); 299 300 logwakeup(); /* wake up anyone waiting for log msgs */ 301 } 302 303 /* 304 * logpri: log the priority level to the klog 305 */ 306 307 void 308 logpri(level) 309 int level; 310 { 311 int s; 312 313 KPRINTF_MUTEX_ENTER(s); 314 klogpri(level); 315 KPRINTF_MUTEX_EXIT(s); 316 } 317 318 /* 319 * Note: we must be in the mutex here! 320 */ 321 void 322 klogpri(level) 323 int level; 324 { 325 char *p; 326 char snbuf[KPRINTF_BUFSIZE]; 327 328 putchar('<', TOLOG, NULL); 329 snprintf(snbuf, sizeof(snbuf), "%d", level); 330 for (p = snbuf ; *p ; p++) 331 putchar(*p, TOLOG, NULL); 332 putchar('>', TOLOG, NULL); 333 } 334 335 /* 336 * addlog: add info to previous log message 337 */ 338 339 void 340 addlog(const char *fmt, ...) 341 { 342 int s; 343 va_list ap; 344 345 KPRINTF_MUTEX_ENTER(s); 346 347 va_start(ap, fmt); 348 kprintf(fmt, TOLOG, NULL, NULL, ap); 349 va_end(ap); 350 if (!log_open) { 351 va_start(ap, fmt); 352 kprintf(fmt, TOCONS, NULL, NULL, ap); 353 va_end(ap); 354 } 355 356 KPRINTF_MUTEX_EXIT(s); 357 358 logwakeup(); 359 } 360 361 362 /* 363 * putchar: print a single character on console or user terminal. 364 * 365 * => if console, then the last MSGBUFS chars are saved in msgbuf 366 * for inspection later (e.g. dmesg/syslog) 367 * => we must already be in the mutex! 368 */ 369 static void 370 putchar(c, flags, tp) 371 int c; 372 int flags; 373 struct tty *tp; 374 { 375 struct kern_msgbuf *mbp; 376 377 if (panicstr) 378 constty = NULL; 379 if ((flags & TOCONS) && tp == NULL && constty) { 380 tp = constty; 381 flags |= TOTTY; 382 } 383 if ((flags & TOTTY) && tp && 384 tputchar(c, flags, tp) < 0 && 385 (flags & TOCONS) && tp == constty) 386 constty = NULL; 387 if ((flags & TOLOG) && 388 c != '\0' && c != '\r' && c != 0177 && msgbufenabled) { 389 mbp = msgbufp; 390 if (mbp->msg_magic != MSG_MAGIC) { 391 /* 392 * Arguably should panic or somehow notify the 393 * user... but how? Panic may be too drastic, 394 * and would obliterate the message being kicked 395 * out (maybe a panic itself), and printf 396 * would invoke us recursively. Silently punt 397 * for now. If syslog is running, it should 398 * notice. 399 */ 400 msgbufenabled = 0; 401 } else { 402 mbp->msg_bufc[mbp->msg_bufx++] = c; 403 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= mbp->msg_bufs) 404 mbp->msg_bufx = 0; 405 /* If the buffer is full, keep the most recent data. */ 406 if (mbp->msg_bufr == mbp->msg_bufx) { 407 if (++mbp->msg_bufr >= mbp->msg_bufs) 408 mbp->msg_bufr = 0; 409 } 410 } 411 } 412 if ((flags & TOCONS) && constty == NULL && c != '\0') 413 (*v_putc)(c); 414 #ifdef DDB 415 if (flags & TODDB) 416 db_putchar(c); 417 #endif 418 } 419 420 421 /* 422 * uprintf: print to the controlling tty of the current process 423 * 424 * => we may block if the tty queue is full 425 * => no message is printed if the queue doesn't clear in a reasonable 426 * time 427 */ 428 429 void 430 uprintf(const char *fmt, ...) 431 { 432 struct proc *p = curproc; 433 va_list ap; 434 435 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 436 /* No mutex needed; going to process TTY. */ 437 va_start(ap, fmt); 438 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 439 va_end(ap); 440 } 441 } 442 443 /* 444 * tprintf functions: used to send messages to a specific process 445 * 446 * usage: 447 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 448 * use the handle when calling "tprintf" 449 * when done, do a "tprintf_close" to drop the handle 450 */ 451 452 /* 453 * tprintf_open: get a tprintf handle on a process "p" 454 * 455 * => returns NULL if process can't be printed to 456 */ 457 458 tpr_t 459 tprintf_open(p) 460 struct proc *p; 461 { 462 463 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 464 SESSHOLD(p->p_session); 465 return ((tpr_t) p->p_session); 466 } 467 return ((tpr_t) NULL); 468 } 469 470 /* 471 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 472 */ 473 474 void 475 tprintf_close(sess) 476 tpr_t sess; 477 { 478 479 if (sess) 480 SESSRELE((struct session *) sess); 481 } 482 483 /* 484 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 485 * send a message to the controlling tty for that process. 486 * 487 * => also sends message to /dev/klog 488 */ 489 void 490 tprintf(tpr_t tpr, const char *fmt, ...) 491 { 492 struct session *sess = (struct session *)tpr; 493 struct tty *tp = NULL; 494 int s, flags = TOLOG; 495 va_list ap; 496 497 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 498 flags |= TOTTY; 499 tp = sess->s_ttyp; 500 } 501 502 KPRINTF_MUTEX_ENTER(s); 503 504 klogpri(LOG_INFO); 505 va_start(ap, fmt); 506 kprintf(fmt, flags, tp, NULL, ap); 507 va_end(ap); 508 509 KPRINTF_MUTEX_EXIT(s); 510 511 logwakeup(); 512 } 513 514 515 /* 516 * ttyprintf: send a message to a specific tty 517 * 518 * => should be used only by tty driver or anything that knows the 519 * underlying tty will not be revoked(2)'d away. [otherwise, 520 * use tprintf] 521 */ 522 void 523 ttyprintf(struct tty *tp, const char *fmt, ...) 524 { 525 va_list ap; 526 527 /* No mutex needed; going to process TTY. */ 528 va_start(ap, fmt); 529 kprintf(fmt, TOTTY, tp, NULL, ap); 530 va_end(ap); 531 } 532 533 #ifdef DDB 534 535 /* 536 * db_printf: printf for DDB (via db_putchar) 537 */ 538 539 void 540 db_printf(const char *fmt, ...) 541 { 542 va_list ap; 543 544 /* No mutex needed; DDB pauses all processors. */ 545 va_start(ap, fmt); 546 kprintf(fmt, TODDB, NULL, NULL, ap); 547 va_end(ap); 548 } 549 550 void 551 db_vprintf(fmt, ap) 552 const char *fmt; 553 va_list ap; 554 { 555 556 /* No mutex needed; DDB pauses all processors. */ 557 kprintf(fmt, TODDB, NULL, NULL, ap); 558 } 559 560 #endif /* DDB */ 561 562 /* 563 * Device autoconfiguration printf routines. These change their 564 * behavior based on the AB_* flags in boothowto. If AB_SILENT 565 * is set, messages never go to the console (but they still always 566 * go to the log). AB_VERBOSE overrides AB_SILENT. 567 */ 568 569 /* 570 * aprint_normal: Send to console unless AB_QUIET. Always goes 571 * to the log. 572 */ 573 void 574 aprint_normal(const char *fmt, ...) 575 { 576 va_list ap; 577 int s, flags = TOLOG; 578 579 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 580 (boothowto & AB_VERBOSE) != 0) 581 flags |= TOCONS; 582 583 KPRINTF_MUTEX_ENTER(s); 584 585 va_start(ap, fmt); 586 kprintf(fmt, flags, NULL, NULL, ap); 587 va_end(ap); 588 589 KPRINTF_MUTEX_EXIT(s); 590 591 if (!panicstr) 592 logwakeup(); 593 } 594 595 /* 596 * aprint_error: Send to console unless AB_QUIET. Always goes 597 * to the log. Also counts the number of times called so other 598 * parts of the kernel can report the number of errors during a 599 * given phase of system startup. 600 */ 601 static int aprint_error_count; 602 603 int 604 aprint_get_error_count(void) 605 { 606 int count, s; 607 608 KPRINTF_MUTEX_ENTER(s); 609 610 count = aprint_error_count; 611 aprint_error_count = 0; 612 613 KPRINTF_MUTEX_EXIT(s); 614 615 return (count); 616 } 617 618 void 619 aprint_error(const char *fmt, ...) 620 { 621 va_list ap; 622 int s, flags = TOLOG; 623 624 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 625 (boothowto & AB_VERBOSE) != 0) 626 flags |= TOCONS; 627 628 KPRINTF_MUTEX_ENTER(s); 629 630 aprint_error_count++; 631 632 va_start(ap, fmt); 633 kprintf(fmt, flags, NULL, NULL, ap); 634 va_end(ap); 635 636 KPRINTF_MUTEX_EXIT(s); 637 638 if (!panicstr) 639 logwakeup(); 640 } 641 642 /* 643 * aprint_naive: Send to console only if AB_QUIET. Never goes 644 * to the log. 645 */ 646 void 647 aprint_naive(const char *fmt, ...) 648 { 649 va_list ap; 650 int s; 651 652 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) == AB_QUIET) { 653 KPRINTF_MUTEX_ENTER(s); 654 655 va_start(ap, fmt); 656 kprintf(fmt, TOCONS, NULL, NULL, ap); 657 va_end(ap); 658 659 KPRINTF_MUTEX_EXIT(s); 660 } 661 } 662 663 /* 664 * aprint_verbose: Send to console only if AB_VERBOSE. Always 665 * goes to the log. 666 */ 667 void 668 aprint_verbose(const char *fmt, ...) 669 { 670 va_list ap; 671 int s, flags = TOLOG; 672 673 if (boothowto & AB_VERBOSE) 674 flags |= TOCONS; 675 676 KPRINTF_MUTEX_ENTER(s); 677 678 va_start(ap, fmt); 679 kprintf(fmt, flags, NULL, NULL, ap); 680 va_end(ap); 681 682 KPRINTF_MUTEX_EXIT(s); 683 684 if (!panicstr) 685 logwakeup(); 686 } 687 688 /* 689 * aprint_debug: Send to console and log only if AB_DEBUG. 690 */ 691 void 692 aprint_debug(const char *fmt, ...) 693 { 694 va_list ap; 695 int s; 696 697 if (boothowto & AB_DEBUG) { 698 KPRINTF_MUTEX_ENTER(s); 699 700 va_start(ap, fmt); 701 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 702 va_end(ap); 703 704 KPRINTF_MUTEX_EXIT(s); 705 } 706 } 707 708 /* 709 * printf_nolog: Like printf(), but does not send message to the log. 710 */ 711 712 void 713 printf_nolog(const char *fmt, ...) 714 { 715 va_list ap; 716 int s; 717 718 KPRINTF_MUTEX_ENTER(s); 719 720 va_start(ap, fmt); 721 kprintf(fmt, TOCONS, NULL, NULL, ap); 722 va_end(ap); 723 724 KPRINTF_MUTEX_EXIT(s); 725 } 726 727 /* 728 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 729 */ 730 731 /* 732 * printf: print a message to the console and the log 733 */ 734 void 735 printf(const char *fmt, ...) 736 { 737 va_list ap; 738 int s; 739 740 KPRINTF_MUTEX_ENTER(s); 741 742 va_start(ap, fmt); 743 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 744 va_end(ap); 745 746 KPRINTF_MUTEX_EXIT(s); 747 748 if (!panicstr) 749 logwakeup(); 750 } 751 752 /* 753 * vprintf: print a message to the console and the log [already have 754 * va_alist] 755 */ 756 757 void 758 vprintf(fmt, ap) 759 const char *fmt; 760 va_list ap; 761 { 762 int s; 763 764 KPRINTF_MUTEX_ENTER(s); 765 766 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 767 768 KPRINTF_MUTEX_EXIT(s); 769 770 if (!panicstr) 771 logwakeup(); 772 } 773 774 /* 775 * sprintf: print a message to a buffer 776 */ 777 int 778 sprintf(char *buf, const char *fmt, ...) 779 { 780 int retval; 781 va_list ap; 782 783 va_start(ap, fmt); 784 retval = kprintf(fmt, TOBUFONLY, NULL, buf, ap); 785 va_end(ap); 786 *(buf + retval) = 0; /* null terminate */ 787 return(retval); 788 } 789 790 /* 791 * vsprintf: print a message to a buffer [already have va_alist] 792 */ 793 794 int 795 vsprintf(buf, fmt, ap) 796 char *buf; 797 const char *fmt; 798 va_list ap; 799 { 800 int retval; 801 802 retval = kprintf(fmt, TOBUFONLY, NULL, buf, ap); 803 *(buf + retval) = 0; /* null terminate */ 804 return (retval); 805 } 806 807 /* 808 * snprintf: print a message to a buffer 809 */ 810 int 811 snprintf(char *buf, size_t size, const char *fmt, ...) 812 { 813 int retval; 814 va_list ap; 815 char *p; 816 817 if (size < 1) 818 return (-1); 819 p = buf + size - 1; 820 va_start(ap, fmt); 821 retval = kprintf(fmt, TOBUFONLY, &p, buf, ap); 822 va_end(ap); 823 *(p) = 0; /* null terminate */ 824 return(retval); 825 } 826 827 /* 828 * vsnprintf: print a message to a buffer [already have va_alist] 829 */ 830 int 831 vsnprintf(buf, size, fmt, ap) 832 char *buf; 833 size_t size; 834 const char *fmt; 835 va_list ap; 836 { 837 int retval; 838 char *p; 839 840 if (size < 1) 841 return (-1); 842 p = buf + size - 1; 843 retval = kprintf(fmt, TOBUFONLY, &p, buf, ap); 844 *(p) = 0; /* null terminate */ 845 return(retval); 846 } 847 848 /* 849 * bitmask_snprintf: print an interpreted bitmask to a buffer 850 * 851 * => returns pointer to the buffer 852 */ 853 char * 854 bitmask_snprintf(val, p, buf, buflen) 855 u_quad_t val; 856 const char *p; 857 char *buf; 858 size_t buflen; 859 { 860 char *bp, *q; 861 size_t left; 862 char *sbase, snbuf[KPRINTF_BUFSIZE]; 863 int base, bit, ch, len, sep; 864 u_quad_t field; 865 866 bp = buf; 867 memset(buf, 0, buflen); 868 869 /* 870 * Always leave room for the trailing NULL. 871 */ 872 left = buflen - 1; 873 874 /* 875 * Print the value into the buffer. Abort if there's not 876 * enough room. 877 */ 878 if (buflen < KPRINTF_BUFSIZE) 879 return (buf); 880 881 ch = *p++; 882 base = ch != '\177' ? ch : *p++; 883 sbase = base == 8 ? "%qo" : base == 10 ? "%qd" : base == 16 ? "%qx" : 0; 884 if (sbase == 0) 885 return (buf); /* punt if not oct, dec, or hex */ 886 887 snprintf(snbuf, sizeof(snbuf), sbase, val); 888 for (q = snbuf ; *q ; q++) { 889 *bp++ = *q; 890 left--; 891 } 892 893 /* 894 * If the value we printed was 0 and we're using the old-style format, 895 * or if we don't have room for "<x>", we're done. 896 */ 897 if (((val == 0) && (ch != '\177')) || left < 3) 898 return (buf); 899 900 #define PUTBYTE(b, c, l) do { \ 901 *(b)++ = (c); \ 902 if (--(l) == 0) \ 903 goto out; \ 904 } while (/*CONSTCOND*/ 0) 905 #define PUTSTR(b, p, l) do { \ 906 int c; \ 907 while ((c = *(p)++) != 0) { \ 908 *(b)++ = c; \ 909 if (--(l) == 0) \ 910 goto out; \ 911 } \ 912 } while (/*CONSTCOND*/ 0) 913 914 /* 915 * Chris Torek's new bitmask format is identified by a leading \177 916 */ 917 sep = '<'; 918 if (ch != '\177') { 919 /* old (standard) format. */ 920 for (;(bit = *p++) != 0;) { 921 if (val & (1 << (bit - 1))) { 922 PUTBYTE(bp, sep, left); 923 for (; (ch = *p) > ' '; ++p) { 924 PUTBYTE(bp, ch, left); 925 } 926 sep = ','; 927 } else 928 for (; *p > ' '; ++p) 929 continue; 930 } 931 } else { 932 /* new quad-capable format; also does fields. */ 933 field = val; 934 while ((ch = *p++) != '\0') { 935 bit = *p++; /* now 0-origin */ 936 switch (ch) { 937 case 'b': 938 if (((u_int)(val >> bit) & 1) == 0) 939 goto skip; 940 PUTBYTE(bp, sep, left); 941 PUTSTR(bp, p, left); 942 sep = ','; 943 break; 944 case 'f': 945 case 'F': 946 len = *p++; /* field length */ 947 field = (val >> bit) & ((1ULL << len) - 1); 948 if (ch == 'F') /* just extract */ 949 break; 950 PUTBYTE(bp, sep, left); 951 sep = ','; 952 PUTSTR(bp, p, left); 953 PUTBYTE(bp, '=', left); 954 sprintf(snbuf, sbase, field); 955 q = snbuf; PUTSTR(bp, q, left); 956 break; 957 case '=': 958 case ':': 959 /* 960 * Here "bit" is actually a value instead, 961 * to be compared against the last field. 962 * This only works for values in [0..255], 963 * of course. 964 */ 965 if ((int)field != bit) 966 goto skip; 967 if (ch == '=') 968 PUTBYTE(bp, '=', left); 969 PUTSTR(bp, p, left); 970 break; 971 default: 972 skip: 973 while (*p++ != '\0') 974 continue; 975 break; 976 } 977 } 978 } 979 if (sep != '<') 980 PUTBYTE(bp, '>', left); 981 982 out: 983 return (buf); 984 985 #undef PUTBYTE 986 #undef PUTSTR 987 } 988 989 /* 990 * kprintf: scaled down version of printf(3). 991 * 992 * this version based on vfprintf() from libc which was derived from 993 * software contributed to Berkeley by Chris Torek. 994 * 995 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 996 */ 997 998 /* 999 * macros for converting digits to letters and vice versa 1000 */ 1001 #define to_digit(c) ((c) - '') 1002 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1003 #define to_char(n) ((n) + '') 1004 1005 /* 1006 * flags used during conversion. 1007 */ 1008 #define ALT 0x001 /* alternate form */ 1009 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1010 #define LADJUST 0x004 /* left adjustment */ 1011 #define LONGDBL 0x008 /* long double; unimplemented */ 1012 #define LONGINT 0x010 /* long integer */ 1013 #define QUADINT 0x020 /* quad integer */ 1014 #define SHORTINT 0x040 /* short integer */ 1015 #define MAXINT 0x080 /* intmax_t */ 1016 #define PTRINT 0x100 /* intptr_t */ 1017 #define SIZEINT 0x200 /* size_t */ 1018 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1019 #define FPT 0x800 /* Floating point number */ 1020 1021 /* 1022 * To extend shorts properly, we need both signed and unsigned 1023 * argument extraction methods. 1024 */ 1025 #define SARG() \ 1026 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1027 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1028 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1029 flags&QUADINT ? va_arg(ap, quad_t) : \ 1030 flags&LONGINT ? va_arg(ap, long) : \ 1031 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1032 (long)va_arg(ap, int)) 1033 #define UARG() \ 1034 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1035 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1036 flags&SIZEINT ? va_arg(ap, size_t) : \ 1037 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1038 flags&LONGINT ? va_arg(ap, u_long) : \ 1039 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1040 (u_long)va_arg(ap, u_int)) 1041 1042 #define KPRINTF_PUTCHAR(C) { \ 1043 if (oflags == TOBUFONLY) { \ 1044 if ((vp != NULL) && (sbuf == tailp)) { \ 1045 ret += 1; /* indicate error */ \ 1046 goto overflow; \ 1047 } \ 1048 *sbuf++ = (C); \ 1049 } else { \ 1050 putchar((C), oflags, (struct tty *)vp); \ 1051 } \ 1052 } 1053 1054 /* 1055 * Guts of kernel printf. Note, we already expect to be in a mutex! 1056 */ 1057 int 1058 kprintf(fmt0, oflags, vp, sbuf, ap) 1059 const char *fmt0; 1060 int oflags; 1061 void *vp; 1062 char *sbuf; 1063 va_list ap; 1064 { 1065 char *fmt; /* format string */ 1066 int ch; /* character from fmt */ 1067 int n; /* handy integer (short term usage) */ 1068 char *cp; /* handy char pointer (short term usage) */ 1069 int flags; /* flags as above */ 1070 int ret; /* return value accumulator */ 1071 int width; /* width from format (%8d), or 0 */ 1072 int prec; /* precision from format (%.3d), or -1 */ 1073 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1074 1075 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1076 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1077 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1078 int realsz; /* field size expanded by dprec */ 1079 int size; /* size of converted field or string */ 1080 char *xdigs; /* digits for [xX] conversion */ 1081 char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1082 char *tailp; /* tail pointer for snprintf */ 1083 1084 tailp = NULL; /* XXX: shutup gcc */ 1085 if (oflags == TOBUFONLY && (vp != NULL)) 1086 tailp = *(char **)vp; 1087 1088 cp = NULL; /* XXX: shutup gcc */ 1089 size = 0; /* XXX: shutup gcc */ 1090 1091 fmt = (char *)fmt0; 1092 ret = 0; 1093 1094 xdigs = NULL; /* XXX: shut up gcc warning */ 1095 1096 /* 1097 * Scan the format for conversions (`%' character). 1098 */ 1099 for (;;) { 1100 while (*fmt != '%' && *fmt) { 1101 ret++; 1102 KPRINTF_PUTCHAR(*fmt++); 1103 } 1104 if (*fmt == 0) 1105 goto done; 1106 1107 fmt++; /* skip over '%' */ 1108 1109 flags = 0; 1110 dprec = 0; 1111 width = 0; 1112 prec = -1; 1113 sign = '\0'; 1114 1115 rflag: ch = *fmt++; 1116 reswitch: switch (ch) { 1117 case ' ': 1118 /* 1119 * ``If the space and + flags both appear, the space 1120 * flag will be ignored.'' 1121 * -- ANSI X3J11 1122 */ 1123 if (!sign) 1124 sign = ' '; 1125 goto rflag; 1126 case '#': 1127 flags |= ALT; 1128 goto rflag; 1129 case '*': 1130 /* 1131 * ``A negative field width argument is taken as a 1132 * - flag followed by a positive field width.'' 1133 * -- ANSI X3J11 1134 * They don't exclude field widths read from args. 1135 */ 1136 if ((width = va_arg(ap, int)) >= 0) 1137 goto rflag; 1138 width = -width; 1139 /* FALLTHROUGH */ 1140 case '-': 1141 flags |= LADJUST; 1142 goto rflag; 1143 case '+': 1144 sign = '+'; 1145 goto rflag; 1146 case '.': 1147 if ((ch = *fmt++) == '*') { 1148 n = va_arg(ap, int); 1149 prec = n < 0 ? -1 : n; 1150 goto rflag; 1151 } 1152 n = 0; 1153 while (is_digit(ch)) { 1154 n = 10 * n + to_digit(ch); 1155 ch = *fmt++; 1156 } 1157 prec = n < 0 ? -1 : n; 1158 goto reswitch; 1159 case '': 1160 /* 1161 * ``Note that 0 is taken as a flag, not as the 1162 * beginning of a field width.'' 1163 * -- ANSI X3J11 1164 */ 1165 flags |= ZEROPAD; 1166 goto rflag; 1167 case '1': case '2': case '3': case '4': 1168 case '5': case '6': case '7': case '8': case '9': 1169 n = 0; 1170 do { 1171 n = 10 * n + to_digit(ch); 1172 ch = *fmt++; 1173 } while (is_digit(ch)); 1174 width = n; 1175 goto reswitch; 1176 case 'h': 1177 flags |= SHORTINT; 1178 goto rflag; 1179 case 'j': 1180 flags |= MAXINT; 1181 goto rflag; 1182 case 'l': 1183 if (*fmt == 'l') { 1184 fmt++; 1185 flags |= QUADINT; 1186 } else { 1187 flags |= LONGINT; 1188 } 1189 goto rflag; 1190 case 'q': 1191 flags |= QUADINT; 1192 goto rflag; 1193 case 't': 1194 flags |= PTRINT; 1195 goto rflag; 1196 case 'z': 1197 flags |= SIZEINT; 1198 goto rflag; 1199 case 'c': 1200 *(cp = buf) = va_arg(ap, int); 1201 size = 1; 1202 sign = '\0'; 1203 break; 1204 case 'D': 1205 flags |= LONGINT; 1206 /*FALLTHROUGH*/ 1207 case 'd': 1208 case 'i': 1209 _uquad = SARG(); 1210 if ((quad_t)_uquad < 0) { 1211 _uquad = -_uquad; 1212 sign = '-'; 1213 } 1214 base = DEC; 1215 goto number; 1216 case 'n': 1217 if (flags & MAXINT) 1218 *va_arg(ap, intmax_t *) = ret; 1219 else if (flags & PTRINT) 1220 *va_arg(ap, intptr_t *) = ret; 1221 else if (flags & SIZEINT) 1222 *va_arg(ap, ssize_t *) = ret; 1223 else if (flags & QUADINT) 1224 *va_arg(ap, quad_t *) = ret; 1225 else if (flags & LONGINT) 1226 *va_arg(ap, long *) = ret; 1227 else if (flags & SHORTINT) 1228 *va_arg(ap, short *) = ret; 1229 else 1230 *va_arg(ap, int *) = ret; 1231 continue; /* no output */ 1232 case 'O': 1233 flags |= LONGINT; 1234 /*FALLTHROUGH*/ 1235 case 'o': 1236 _uquad = UARG(); 1237 base = OCT; 1238 goto nosign; 1239 case 'p': 1240 /* 1241 * ``The argument shall be a pointer to void. The 1242 * value of the pointer is converted to a sequence 1243 * of printable characters, in an implementation- 1244 * defined manner.'' 1245 * -- ANSI X3J11 1246 */ 1247 /* NOSTRICT */ 1248 _uquad = (u_long)va_arg(ap, void *); 1249 base = HEX; 1250 xdigs = "0123456789abcdef"; 1251 flags |= HEXPREFIX; 1252 ch = 'x'; 1253 goto nosign; 1254 case 's': 1255 if ((cp = va_arg(ap, char *)) == NULL) 1256 cp = "(null)"; 1257 if (prec >= 0) { 1258 /* 1259 * can't use strlen; can only look for the 1260 * NUL in the first `prec' characters, and 1261 * strlen() will go further. 1262 */ 1263 char *p = memchr(cp, 0, prec); 1264 1265 if (p != NULL) { 1266 size = p - cp; 1267 if (size > prec) 1268 size = prec; 1269 } else 1270 size = prec; 1271 } else 1272 size = strlen(cp); 1273 sign = '\0'; 1274 break; 1275 case 'U': 1276 flags |= LONGINT; 1277 /*FALLTHROUGH*/ 1278 case 'u': 1279 _uquad = UARG(); 1280 base = DEC; 1281 goto nosign; 1282 case 'X': 1283 xdigs = "0123456789ABCDEF"; 1284 goto hex; 1285 case 'x': 1286 xdigs = "0123456789abcdef"; 1287 hex: _uquad = UARG(); 1288 base = HEX; 1289 /* leading 0x/X only if non-zero */ 1290 if (flags & ALT && _uquad != 0) 1291 flags |= HEXPREFIX; 1292 1293 /* unsigned conversions */ 1294 nosign: sign = '\0'; 1295 /* 1296 * ``... diouXx conversions ... if a precision is 1297 * specified, the 0 flag will be ignored.'' 1298 * -- ANSI X3J11 1299 */ 1300 number: if ((dprec = prec) >= 0) 1301 flags &= ~ZEROPAD; 1302 1303 /* 1304 * ``The result of converting a zero value with an 1305 * explicit precision of zero is no characters.'' 1306 * -- ANSI X3J11 1307 */ 1308 cp = buf + KPRINTF_BUFSIZE; 1309 if (_uquad != 0 || prec != 0) { 1310 /* 1311 * Unsigned mod is hard, and unsigned mod 1312 * by a constant is easier than that by 1313 * a variable; hence this switch. 1314 */ 1315 switch (base) { 1316 case OCT: 1317 do { 1318 *--cp = to_char(_uquad & 7); 1319 _uquad >>= 3; 1320 } while (_uquad); 1321 /* handle octal leading 0 */ 1322 if (flags & ALT && *cp != '') 1323 *--cp = ''; 1324 break; 1325 1326 case DEC: 1327 /* many numbers are 1 digit */ 1328 while (_uquad >= 10) { 1329 *--cp = to_char(_uquad % 10); 1330 _uquad /= 10; 1331 } 1332 *--cp = to_char(_uquad); 1333 break; 1334 1335 case HEX: 1336 do { 1337 *--cp = xdigs[_uquad & 15]; 1338 _uquad >>= 4; 1339 } while (_uquad); 1340 break; 1341 1342 default: 1343 cp = "bug in kprintf: bad base"; 1344 size = strlen(cp); 1345 goto skipsize; 1346 } 1347 } 1348 size = buf + KPRINTF_BUFSIZE - cp; 1349 skipsize: 1350 break; 1351 default: /* "%?" prints ?, unless ? is NUL */ 1352 if (ch == '\0') 1353 goto done; 1354 /* pretend it was %c with argument ch */ 1355 cp = buf; 1356 *cp = ch; 1357 size = 1; 1358 sign = '\0'; 1359 break; 1360 } 1361 1362 /* 1363 * All reasonable formats wind up here. At this point, `cp' 1364 * points to a string which (if not flags&LADJUST) should be 1365 * padded out to `width' places. If flags&ZEROPAD, it should 1366 * first be prefixed by any sign or other prefix; otherwise, 1367 * it should be blank padded before the prefix is emitted. 1368 * After any left-hand padding and prefixing, emit zeroes 1369 * required by a decimal [diouxX] precision, then print the 1370 * string proper, then emit zeroes required by any leftover 1371 * floating precision; finally, if LADJUST, pad with blanks. 1372 * 1373 * Compute actual size, so we know how much to pad. 1374 * size excludes decimal prec; realsz includes it. 1375 */ 1376 realsz = dprec > size ? dprec : size; 1377 if (sign) 1378 realsz++; 1379 else if (flags & HEXPREFIX) 1380 realsz+= 2; 1381 1382 /* adjust ret */ 1383 ret += width > realsz ? width : realsz; 1384 1385 /* right-adjusting blank padding */ 1386 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1387 n = width - realsz; 1388 while (n-- > 0) 1389 KPRINTF_PUTCHAR(' '); 1390 } 1391 1392 /* prefix */ 1393 if (sign) { 1394 KPRINTF_PUTCHAR(sign); 1395 } else if (flags & HEXPREFIX) { 1396 KPRINTF_PUTCHAR(''); 1397 KPRINTF_PUTCHAR(ch); 1398 } 1399 1400 /* right-adjusting zero padding */ 1401 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1402 n = width - realsz; 1403 while (n-- > 0) 1404 KPRINTF_PUTCHAR(''); 1405 } 1406 1407 /* leading zeroes from decimal precision */ 1408 n = dprec - size; 1409 while (n-- > 0) 1410 KPRINTF_PUTCHAR(''); 1411 1412 /* the string or number proper */ 1413 while (size--) 1414 KPRINTF_PUTCHAR(*cp++); 1415 /* left-adjusting padding (always blank) */ 1416 if (flags & LADJUST) { 1417 n = width - realsz; 1418 while (n-- > 0) 1419 KPRINTF_PUTCHAR(' '); 1420 } 1421 } 1422 1423 done: 1424 if ((oflags == TOBUFONLY) && (vp != NULL)) 1425 *(char **)vp = sbuf; 1426 (*v_flush)(); 1427 overflow: 1428 return (ret); 1429 /* NOTREACHED */ 1430 }
Cache object: 34da6ae9c1d2f9cd05433ac5f6cf6da6
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