1 /* 2 * Copyright (c) 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 /* 35 * The following copyright applies to the DDB command code: 36 * 37 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org> 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the author nor the names of any co-contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 /* 65 * $DragonFly: src/sys/kern/kern_ktr.c,v 1.23 2008/02/12 23:33:23 corecode Exp $ 66 */ 67 /* 68 * Kernel tracepoint facility. 69 */ 70 71 #include "opt_ddb.h" 72 #include "opt_ktr.h" 73 74 #include <sys/param.h> 75 #include <sys/cons.h> 76 #include <sys/kernel.h> 77 #include <sys/libkern.h> 78 #include <sys/proc.h> 79 #include <sys/sysctl.h> 80 #include <sys/ktr.h> 81 #include <sys/systm.h> 82 #include <sys/time.h> 83 #include <sys/malloc.h> 84 #include <sys/spinlock.h> 85 #include <sys/thread2.h> 86 #include <sys/spinlock2.h> 87 #include <sys/ctype.h> 88 89 #include <machine/cpu.h> 90 #include <machine/cpufunc.h> 91 #include <machine/specialreg.h> 92 #include <machine/md_var.h> 93 94 #include <ddb/ddb.h> 95 96 #ifndef KTR_ENTRIES 97 #define KTR_ENTRIES 2048 98 #endif 99 #define KTR_ENTRIES_MASK (KTR_ENTRIES - 1) 100 101 /* 102 * test logging support. When ktr_testlogcnt is non-zero each synchronization 103 * interrupt will issue six back-to-back ktr logging messages on cpu 0 104 * so the user can determine KTR logging overheads. 105 */ 106 #if !defined(KTR_TESTLOG) 107 #define KTR_TESTLOG KTR_ALL 108 #endif 109 KTR_INFO_MASTER(testlog); 110 #if KTR_TESTLOG 111 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1", sizeof(void *) * 4); 112 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2", sizeof(void *) * 4); 113 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3", sizeof(void *) * 4); 114 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4", 0); 115 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5", 0); 116 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6", 0); 117 #ifdef SMP 118 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong", 0); 119 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline", 0); 120 KTR_INFO(KTR_TESTLOG, testlog, crit_beg, 8, "crit_beg", 0); 121 KTR_INFO(KTR_TESTLOG, testlog, crit_end, 9, "crit_end", 0); 122 KTR_INFO(KTR_TESTLOG, testlog, spin_beg, 10, "spin_beg", 0); 123 KTR_INFO(KTR_TESTLOG, testlog, spin_end, 11, "spin_end", 0); 124 #endif 125 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0) 126 #define logtest_noargs(name) KTR_LOG(testlog_ ## name) 127 #endif 128 129 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers"); 130 131 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr"); 132 133 int ktr_entries = KTR_ENTRIES; 134 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, ""); 135 136 int ktr_version = KTR_VERSION; 137 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, ""); 138 139 static int ktr_stacktrace = 1; 140 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, ""); 141 142 static int ktr_resynchronize = 0; 143 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, &ktr_resynchronize, 0, ""); 144 145 #if KTR_TESTLOG 146 static int ktr_testlogcnt = 0; 147 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, ""); 148 static int ktr_testipicnt = 0; 149 #ifdef SMP 150 static int ktr_testipicnt_remainder; 151 #endif 152 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, ""); 153 static int ktr_testcritcnt = 0; 154 SYSCTL_INT(_debug_ktr, OID_AUTO, testcritcnt, CTLFLAG_RW, &ktr_testcritcnt, 0, ""); 155 static int ktr_testspincnt = 0; 156 SYSCTL_INT(_debug_ktr, OID_AUTO, testspincnt, CTLFLAG_RW, &ktr_testspincnt, 0, ""); 157 #endif 158 159 /* 160 * Give cpu0 a static buffer so the tracepoint facility can be used during 161 * early boot (note however that we still use a critical section, XXX). 162 */ 163 static struct ktr_entry ktr_buf0[KTR_ENTRIES]; 164 165 __cachealign struct ktr_cpu ktr_cpu[MAXCPU] = { 166 { .core.ktr_buf = &ktr_buf0[0] } 167 }; 168 169 #ifdef SMP 170 static int ktr_sync_state = 0; 171 static int ktr_sync_count; 172 static int64_t ktr_sync_tsc; 173 #endif 174 struct callout ktr_resync_callout; 175 176 #ifdef KTR_VERBOSE 177 int ktr_verbose = KTR_VERBOSE; 178 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); 179 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); 180 #endif 181 182 static void ktr_resync_callback(void *dummy __unused); 183 184 extern int64_t tsc_offsets[]; 185 186 static void 187 ktr_sysinit(void *dummy) 188 { 189 struct ktr_cpu_core *kcpu; 190 int i; 191 192 for(i = 1; i < ncpus; ++i) { 193 kcpu = &ktr_cpu[i].core; 194 kcpu->ktr_buf = kmalloc(KTR_ENTRIES * sizeof(struct ktr_entry), 195 M_KTR, M_WAITOK | M_ZERO); 196 } 197 callout_init(&ktr_resync_callout); 198 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 199 } 200 SYSINIT(ktr_sysinit, SI_BOOT2_KLD, SI_ORDER_ANY, ktr_sysinit, NULL); 201 202 /* 203 * Try to resynchronize the TSC's for all cpus. This is really, really nasty. 204 * We have to send an IPIQ message to all remote cpus, wait until they 205 * get into their IPIQ processing code loop, then do an even stricter hard 206 * loop to get the cpus as close to synchronized as we can to get the most 207 * accurate reading. 208 * 209 * This callback occurs on cpu0. 210 */ 211 #if KTR_TESTLOG 212 #ifdef SMP 213 static void ktr_pingpong_remote(void *dummy); 214 static void ktr_pipeline_remote(void *dummy); 215 #endif 216 #endif 217 218 #if defined(SMP) && defined(_RDTSC_SUPPORTED_) 219 220 static void ktr_resync_remote(void *dummy); 221 extern cpumask_t smp_active_mask; 222 223 /* 224 * We use a callout callback instead of a systimer because we cannot afford 225 * to preempt anyone to do this, or we might deadlock a spin-lock or 226 * serializer between two cpus. 227 */ 228 static 229 void 230 ktr_resync_callback(void *dummy __unused) 231 { 232 int count; 233 234 KKASSERT(mycpu->gd_cpuid == 0); 235 236 #if KTR_TESTLOG 237 /* 238 * Test logging 239 */ 240 if (ktr_testlogcnt) { 241 --ktr_testlogcnt; 242 cpu_disable_intr(); 243 logtest(test1); 244 logtest(test2); 245 logtest(test3); 246 logtest_noargs(test4); 247 logtest_noargs(test5); 248 logtest_noargs(test6); 249 cpu_enable_intr(); 250 } 251 252 /* 253 * Test IPI messaging 254 */ 255 if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) { 256 ktr_testipicnt_remainder = ktr_testipicnt; 257 ktr_testipicnt = 0; 258 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL); 259 } 260 261 /* 262 * Test critical sections 263 */ 264 if (ktr_testcritcnt) { 265 crit_enter(); 266 crit_exit(); 267 logtest_noargs(crit_beg); 268 for (count = ktr_testcritcnt; count; --count) { 269 crit_enter(); 270 crit_exit(); 271 } 272 logtest_noargs(crit_end); 273 ktr_testcritcnt = 0; 274 } 275 276 /* 277 * Test spinlock sections 278 */ 279 if (ktr_testspincnt) { 280 struct spinlock spin; 281 282 spin_init(&spin); 283 spin_lock(&spin); 284 spin_unlock(&spin); 285 logtest_noargs(spin_beg); 286 for (count = ktr_testspincnt; count; --count) { 287 spin_lock(&spin); 288 spin_unlock(&spin); 289 } 290 logtest_noargs(spin_end); 291 ktr_testspincnt = 0; 292 } 293 #endif 294 295 /* 296 * Resynchronize the TSC 297 */ 298 if (ktr_resynchronize == 0) 299 goto done; 300 if ((cpu_feature & CPUID_TSC) == 0) 301 return; 302 303 /* 304 * Send the synchronizing IPI and wait for all cpus to get into 305 * their spin loop. We must process incoming IPIs while waiting 306 * to avoid a deadlock. 307 */ 308 crit_enter(); 309 ktr_sync_count = 0; 310 ktr_sync_state = 1; 311 ktr_sync_tsc = rdtsc(); 312 count = lwkt_send_ipiq_mask(mycpu->gd_other_cpus & smp_active_mask, 313 (ipifunc1_t)ktr_resync_remote, NULL); 314 while (ktr_sync_count != count) 315 lwkt_process_ipiq(); 316 317 /* 318 * Continuously update the TSC for cpu 0 while waiting for all other 319 * cpus to finish stage 2. 320 */ 321 cpu_disable_intr(); 322 ktr_sync_tsc = rdtsc(); 323 cpu_sfence(); 324 ktr_sync_state = 2; 325 cpu_sfence(); 326 while (ktr_sync_count != 0) { 327 ktr_sync_tsc = rdtsc(); 328 cpu_lfence(); 329 cpu_nop(); 330 } 331 cpu_enable_intr(); 332 crit_exit(); 333 ktr_sync_state = 0; 334 done: 335 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 336 } 337 338 /* 339 * The remote-end of the KTR synchronization protocol runs on all cpus except 340 * cpu 0. Since this is an IPI function, it is entered with the current 341 * thread in a critical section. 342 */ 343 static void 344 ktr_resync_remote(void *dummy __unused) 345 { 346 volatile int64_t tsc1 = ktr_sync_tsc; 347 volatile int64_t tsc2; 348 349 /* 350 * Inform the master that we have entered our hard loop. 351 */ 352 KKASSERT(ktr_sync_state == 1); 353 atomic_add_int(&ktr_sync_count, 1); 354 while (ktr_sync_state == 1) { 355 lwkt_process_ipiq(); 356 } 357 358 /* 359 * Now the master is in a hard loop, synchronize the TSC and 360 * we are done. 361 */ 362 cpu_disable_intr(); 363 KKASSERT(ktr_sync_state == 2); 364 tsc2 = ktr_sync_tsc; 365 if (tsc2 > tsc1) 366 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc2; 367 atomic_subtract_int(&ktr_sync_count, 1); 368 cpu_enable_intr(); 369 } 370 371 #if KTR_TESTLOG 372 373 static 374 void 375 ktr_pingpong_remote(void *dummy __unused) 376 { 377 int other_cpu; 378 379 logtest_noargs(pingpong); 380 other_cpu = 1 - mycpu->gd_cpuid; 381 if (ktr_testipicnt_remainder) { 382 --ktr_testipicnt_remainder; 383 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_remote, NULL); 384 } else { 385 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 386 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 387 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 388 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 389 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 390 } 391 } 392 393 static 394 void 395 ktr_pipeline_remote(void *dummy __unused) 396 { 397 logtest_noargs(pipeline); 398 } 399 400 #endif 401 402 #else /* !SMP */ 403 404 /* 405 * The resync callback for UP doesn't do anything other then run the test 406 * log messages. If test logging is not enabled, don't bother resetting 407 * the callout. 408 */ 409 static 410 void 411 ktr_resync_callback(void *dummy __unused) 412 { 413 #if KTR_TESTLOG 414 /* 415 * Test logging 416 */ 417 if (ktr_testlogcnt) { 418 --ktr_testlogcnt; 419 cpu_disable_intr(); 420 logtest(test1); 421 logtest(test2); 422 logtest(test3); 423 logtest_noargs(test4); 424 logtest_noargs(test5); 425 logtest_noargs(test6); 426 cpu_enable_intr(); 427 } 428 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 429 #endif 430 } 431 432 #endif 433 434 /* 435 * KTR_WRITE_ENTRY - Primary entry point for kernel trace logging 436 */ 437 438 static __inline 439 void 440 ktr_write_entry(struct ktr_info *info, const char *file, int line, __va_list va) 441 { 442 struct ktr_cpu_core *kcpu; 443 struct ktr_entry *entry; 444 int cpu; 445 446 cpu = mycpu->gd_cpuid; 447 kcpu = &ktr_cpu[cpu].core; 448 if (kcpu->ktr_buf == NULL) 449 return; 450 451 crit_enter(); 452 entry = kcpu->ktr_buf + (kcpu->ktr_idx & KTR_ENTRIES_MASK); 453 ++kcpu->ktr_idx; 454 #ifdef _RDTSC_SUPPORTED_ 455 if (cpu_feature & CPUID_TSC) { 456 #ifdef SMP 457 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu]; 458 #else 459 entry->ktr_timestamp = rdtsc(); 460 #endif 461 } else 462 #endif 463 { 464 entry->ktr_timestamp = get_approximate_time_t(); 465 } 466 entry->ktr_info = info; 467 entry->ktr_file = file; 468 entry->ktr_line = line; 469 crit_exit(); 470 if (info->kf_data_size > KTR_BUFSIZE) 471 bcopy(va, entry->ktr_data, KTR_BUFSIZE); 472 else if (info->kf_data_size) 473 bcopy(va, entry->ktr_data, info->kf_data_size); 474 if (ktr_stacktrace) 475 cpu_ktr_caller(entry); 476 #ifdef KTR_VERBOSE 477 if (ktr_verbose && info->kf_format) { 478 #ifdef SMP 479 kprintf("cpu%d ", cpu); 480 #endif 481 if (ktr_verbose > 1) { 482 kprintf("%s.%d\t", entry->ktr_file, entry->ktr_line); 483 } 484 kvprintf(info->kf_format, va); 485 kprintf("\n"); 486 } 487 #endif 488 } 489 490 void 491 ktr_log(struct ktr_info *info, const char *file, int line, ...) 492 { 493 __va_list va; 494 495 if (panicstr == NULL) { 496 __va_start(va, line); 497 ktr_write_entry(info, file, line, va); 498 __va_end(va); 499 } 500 } 501 502 #ifdef DDB 503 504 #define NUM_LINES_PER_PAGE 19 505 506 struct tstate { 507 int cur; 508 int first; 509 }; 510 511 static int db_ktr_verbose; 512 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx); 513 514 DB_SHOW_COMMAND(ktr, db_ktr_all) 515 { 516 struct ktr_cpu_core *kcpu; 517 int a_flag = 0; 518 int c; 519 int nl = 0; 520 int i; 521 struct tstate tstate[MAXCPU]; 522 int printcpu = -1; 523 524 for(i = 0; i < ncpus; i++) { 525 kcpu = &ktr_cpu[i].core; 526 tstate[i].first = -1; 527 tstate[i].cur = (kcpu->ktr_idx - 1) & KTR_ENTRIES_MASK; 528 } 529 db_ktr_verbose = 0; 530 while ((c = *(modif++)) != '\0') { 531 if (c == 'v') { 532 db_ktr_verbose = 1; 533 } 534 else if (c == 'a') { 535 a_flag = 1; 536 } 537 else if (c == 'c') { 538 printcpu = 0; 539 while ((c = *(modif++)) != '\0') { 540 if (isdigit(c)) { 541 printcpu *= 10; 542 printcpu += c - '0'; 543 } 544 else { 545 modif++; 546 break; 547 } 548 } 549 modif--; 550 } 551 } 552 if (printcpu > ncpus - 1) { 553 db_printf("Invalid cpu number\n"); 554 return; 555 } 556 /* 557 * Lopp throug all the buffers and print the content of them, sorted 558 * by the timestamp. 559 */ 560 while (1) { 561 int counter; 562 u_int64_t highest_ts; 563 int highest_cpu; 564 struct ktr_entry *kp; 565 566 if (a_flag == 1 && cncheckc() != -1) 567 return; 568 highest_ts = 0; 569 highest_cpu = -1; 570 /* 571 * Find the lowest timestamp 572 */ 573 for (i = 0, counter = 0; i < ncpus; i++) { 574 kcpu = &ktr_cpu[i].core; 575 if (kcpu->ktr_buf == NULL) 576 continue; 577 if (printcpu != -1 && printcpu != i) 578 continue; 579 if (tstate[i].cur == -1) { 580 counter++; 581 if (counter == ncpus) { 582 db_printf("--- End of trace buffer ---\n"); 583 return; 584 } 585 continue; 586 } 587 if (kcpu->ktr_buf[tstate[i].cur].ktr_timestamp > highest_ts) { 588 highest_ts = kcpu->ktr_buf[tstate[i].cur].ktr_timestamp; 589 highest_cpu = i; 590 } 591 } 592 if (highest_cpu < 0) { 593 db_printf("no KTR data available\n"); 594 break; 595 } 596 i = highest_cpu; 597 kcpu = &ktr_cpu[i].core; 598 kp = &kcpu->ktr_buf[tstate[i].cur]; 599 if (tstate[i].first == -1) 600 tstate[i].first = tstate[i].cur; 601 if (--tstate[i].cur < 0) 602 tstate[i].cur = KTR_ENTRIES - 1; 603 if (tstate[i].first == tstate[i].cur) { 604 db_mach_vtrace(i, kp, tstate[i].cur + 1); 605 tstate[i].cur = -1; 606 continue; 607 } 608 if (kcpu->ktr_buf[tstate[i].cur].ktr_info == NULL) 609 tstate[i].cur = -1; 610 if (db_more(&nl) == -1) 611 break; 612 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0) 613 tstate[i].cur = -1; 614 } 615 } 616 617 static int 618 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx) 619 { 620 if (kp->ktr_info == NULL) 621 return(0); 622 #ifdef SMP 623 db_printf("cpu%d ", cpu); 624 #endif 625 db_printf("%d: ", idx); 626 if (db_ktr_verbose) { 627 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp, 628 kp->ktr_file, kp->ktr_line); 629 } 630 db_printf("%s\t", kp->ktr_info->kf_name); 631 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2); 632 #ifdef __i386__ 633 if (kp->ktr_info->kf_format) 634 db_vprintf(kp->ktr_info->kf_format, (__va_list)kp->ktr_data); 635 #endif 636 db_printf("\n"); 637 638 return(1); 639 } 640 641 #endif /* DDB */ 642