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 1.13 2006/03/25 21:28:07 swildner 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 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1", sizeof(void *) * 4); 111 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2", sizeof(void *) * 4); 112 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3", sizeof(void *) * 4); 113 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4", 0); 114 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5", 0); 115 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6", 0); 116 #ifdef SMP 117 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong", 0); 118 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline", 0); 119 #endif 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 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0) 125 #define logtest_noargs(name) KTR_LOG(testlog_ ## name) 126 127 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers"); 128 129 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr"); 130 131 static int32_t ktr_cpumask = -1; 132 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask); 133 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, ""); 134 135 static int ktr_entries = KTR_ENTRIES; 136 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, ""); 137 138 static int ktr_version = KTR_VERSION; 139 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, ""); 140 141 static int ktr_stacktrace = 1; 142 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, ""); 143 144 static int ktr_resynchronize = 0; 145 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, &ktr_resynchronize, 0, ""); 146 147 #if KTR_TESTLOG 148 static int ktr_testlogcnt = 0; 149 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, ""); 150 static int ktr_testipicnt = 0; 151 static int ktr_testipicnt_remainder; 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 static struct ktr_entry *ktr_buf[MAXCPU] = { &ktr_buf0[0] }; 165 static int ktr_idx[MAXCPU]; 166 #ifdef SMP 167 static int ktr_sync_state = 0; 168 static int ktr_sync_count; 169 static int64_t ktr_sync_tsc; 170 #endif 171 struct callout ktr_resync_callout; 172 173 #ifdef KTR_VERBOSE 174 int ktr_verbose = KTR_VERBOSE; 175 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); 176 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); 177 #endif 178 179 extern int64_t tsc_offsets[]; 180 181 #if KTR_TESTLOG || KTR_ALL 182 183 static void 184 ktr_sysinit(void *dummy) 185 { 186 int i; 187 188 for(i = 1; i < ncpus; ++i) { 189 ktr_buf[i] = malloc(KTR_ENTRIES * sizeof(struct ktr_entry), 190 M_KTR, M_WAITOK | M_ZERO); 191 } 192 } 193 SYSINIT(ktr_sysinit, SI_SUB_INTRINSIC, SI_ORDER_FIRST, ktr_sysinit, NULL); 194 195 #endif 196 197 /* 198 * Try to resynchronize the TSC's for all cpus. This is really, really nasty. 199 * We have to send an IPIQ message to all remote cpus, wait until they 200 * get into their IPIQ processing code loop, then do an even stricter hard 201 * loop to get the cpus as close to synchronized as we can to get the most 202 * accurate reading. 203 * 204 * This callback occurs on cpu0. 205 */ 206 static void ktr_resync_callback(void *dummy); 207 static void ktr_pingpong_remote(void *dummy); 208 static void ktr_pipeline_remote(void *dummy); 209 210 static void 211 ktr_resyncinit(void *dummy) 212 { 213 callout_init(&ktr_resync_callout); 214 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 215 } 216 SYSINIT(ktr_resync, SI_SUB_FINISH_SMP+1, SI_ORDER_ANY, ktr_resyncinit, NULL); 217 218 #ifdef SMP 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_quick(&spin); 284 spin_unlock_quick(&spin); 285 logtest_noargs(spin_beg); 286 for (count = ktr_testspincnt; count; --count) { 287 spin_lock_quick(&spin); 288 spin_unlock_quick(&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 static 372 void 373 ktr_pingpong_remote(void *dummy __unused) 374 { 375 int other_cpu; 376 377 logtest_noargs(pingpong); 378 other_cpu = 1 - mycpu->gd_cpuid; 379 if (ktr_testipicnt_remainder) { 380 --ktr_testipicnt_remainder; 381 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_remote, NULL); 382 } else { 383 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 384 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL); 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 } 389 } 390 391 static 392 void 393 ktr_pipeline_remote(void *dummy __unused) 394 { 395 logtest_noargs(pipeline); 396 } 397 398 #else /* !SMP */ 399 400 /* 401 * The resync callback for UP doesn't do anything other then run the test 402 * log messages. If test logging is not enabled, don't bother resetting 403 * the callout. 404 */ 405 static 406 void 407 ktr_resync_callback(void *dummy __unused) 408 { 409 #if KTR_TESTLOG 410 /* 411 * Test logging 412 */ 413 if (ktr_testlogcnt) { 414 --ktr_testlogcnt; 415 cpu_disable_intr(); 416 logtest(test1); 417 logtest(test2); 418 logtest(test3); 419 logtest_noargs(test4); 420 logtest_noargs(test5); 421 logtest_noargs(test6); 422 cpu_enable_intr(); 423 } 424 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL); 425 #endif 426 } 427 428 #endif 429 430 /* 431 * KTR_WRITE_ENTRY - Primary entry point for kernel trace logging 432 */ 433 static __inline 434 void 435 ktr_write_entry(struct ktr_info *info, const char *file, int line, 436 const void *ptr) 437 { 438 struct ktr_entry *entry; 439 int cpu; 440 441 cpu = mycpu->gd_cpuid; 442 if (!ktr_buf[cpu]) 443 return; 444 445 crit_enter(); 446 entry = ktr_buf[cpu] + (ktr_idx[cpu] & KTR_ENTRIES_MASK); 447 ++ktr_idx[cpu]; 448 if (cpu_feature & CPUID_TSC) { 449 #ifdef SMP 450 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu]; 451 #else 452 entry->ktr_timestamp = rdtsc(); 453 #endif 454 } else { 455 entry->ktr_timestamp = get_approximate_time_t(); 456 } 457 entry->ktr_info = info; 458 entry->ktr_file = file; 459 entry->ktr_line = line; 460 crit_exit(); 461 if (info->kf_data_size > KTR_BUFSIZE) 462 bcopyi(ptr, entry->ktr_data, KTR_BUFSIZE); 463 else if (info->kf_data_size) 464 bcopyi(ptr, entry->ktr_data, info->kf_data_size); 465 if (ktr_stacktrace) 466 cpu_ktr_caller(entry); 467 #ifdef KTR_VERBOSE 468 if (ktr_verbose && info->kf_format) { 469 #ifdef SMP 470 printf("cpu%d ", cpu); 471 #endif 472 if (ktr_verbose > 1) { 473 printf("%s.%d\t", entry->ktr_file, entry->ktr_line); 474 } 475 vprintf(info->kf_format, ptr); 476 printf("\n"); 477 } 478 #endif 479 } 480 481 void 482 ktr_log(struct ktr_info *info, const char *file, int line, ...) 483 { 484 __va_list va; 485 486 if (panicstr == NULL) { 487 __va_start(va, line); 488 ktr_write_entry(info, file, line, va); 489 __va_end(va); 490 } 491 } 492 493 void 494 ktr_log_ptr(struct ktr_info *info, const char *file, int line, const void *ptr) 495 { 496 if (panicstr == NULL) { 497 ktr_write_entry(info, file, line, ptr); 498 } 499 } 500 501 #ifdef DDB 502 503 #define NUM_LINES_PER_PAGE 19 504 505 struct tstate { 506 int cur; 507 int first; 508 }; 509 510 static int db_ktr_verbose; 511 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx); 512 513 DB_SHOW_COMMAND(ktr, db_ktr_all) 514 { 515 int a_flag = 0; 516 int c; 517 int nl = 0; 518 int i; 519 struct tstate tstate[MAXCPU]; 520 int printcpu = -1; 521 522 for(i = 0; i < ncpus; i++) { 523 tstate[i].first = -1; 524 tstate[i].cur = ktr_idx[i] & KTR_ENTRIES_MASK; 525 } 526 db_ktr_verbose = 0; 527 while ((c = *(modif++)) != '\0') { 528 if (c == 'v') { 529 db_ktr_verbose = 1; 530 } 531 else if (c == 'a') { 532 a_flag = 1; 533 } 534 else if (c == 'c') { 535 printcpu = 0; 536 while ((c = *(modif++)) != '\0') { 537 if (isdigit(c)) { 538 printcpu *= 10; 539 printcpu += c - '0'; 540 } 541 else { 542 modif++; 543 break; 544 } 545 } 546 modif--; 547 } 548 } 549 if (printcpu > ncpus - 1) { 550 db_printf("Invalid cpu number\n"); 551 return; 552 } 553 /* 554 * Lopp throug all the buffers and print the content of them, sorted 555 * by the timestamp. 556 */ 557 while (1) { 558 int counter; 559 u_int64_t highest_ts; 560 int highest_cpu; 561 struct ktr_entry *kp; 562 563 if (a_flag == 1 && cncheckc() != -1) 564 return; 565 highest_ts = 0; 566 highest_cpu = -1; 567 /* 568 * Find the lowest timestamp 569 */ 570 for (i = 0, counter = 0; i < ncpus; i++) { 571 if (ktr_buf[i] == NULL) 572 continue; 573 if (printcpu != -1 && printcpu != i) 574 continue; 575 if (tstate[i].cur == -1) { 576 counter++; 577 if (counter == ncpus) { 578 db_printf("--- End of trace buffer ---\n"); 579 return; 580 } 581 continue; 582 } 583 if (ktr_buf[i][tstate[i].cur].ktr_timestamp > highest_ts) { 584 highest_ts = ktr_buf[i][tstate[i].cur].ktr_timestamp; 585 highest_cpu = i; 586 } 587 } 588 i = highest_cpu; 589 KKASSERT(i != -1); 590 kp = &ktr_buf[i][tstate[i].cur]; 591 if (tstate[i].first == -1) 592 tstate[i].first = tstate[i].cur; 593 if (--tstate[i].cur < 0) 594 tstate[i].cur = KTR_ENTRIES - 1; 595 if (tstate[i].first == tstate[i].cur) { 596 db_mach_vtrace(i, kp, tstate[i].cur + 1); 597 tstate[i].cur = -1; 598 continue; 599 } 600 if (ktr_buf[i][tstate[i].cur].ktr_info == NULL) 601 tstate[i].cur = -1; 602 if (db_more(&nl) == -1) 603 break; 604 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0) 605 tstate[i].cur = -1; 606 } 607 } 608 609 static int 610 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx) 611 { 612 if (kp->ktr_info == NULL) 613 return(0); 614 #ifdef SMP 615 db_printf("cpu%d ", cpu); 616 #endif 617 db_printf("%d: ", idx); 618 if (db_ktr_verbose) { 619 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp, 620 kp->ktr_file, kp->ktr_line); 621 } 622 db_printf("%s\t", kp->ktr_info->kf_name); 623 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2); 624 if (kp->ktr_info->kf_format) { 625 int32_t *args = kp->ktr_data; 626 db_printf(kp->ktr_info->kf_format, 627 args[0], args[1], args[2], args[3], 628 args[4], args[5], args[6], args[7], 629 args[8], args[9], args[10], args[11]); 630 631 } 632 db_printf("\n"); 633 634 return(1); 635 } 636 637 #endif /* DDB */ 638