osfmk/kern/debug.c

   1 /*
   2  * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56
  57 #include <mach_assert.h>
  58 #include <mach_kdp.h>
  59
  60 #include <kern/cpu_number.h>
  61 #include <kern/kalloc.h>
  62 #include <kern/lock.h>
  63 #include <kern/spl.h>
  64 #include <kern/thread.h>
  65 #include <kern/assert.h>
  66 #include <kern/sched_prim.h>
  67 #include <kern/misc_protos.h>
  68 #include <kern/clock.h>
  69 #include <kern/telemetry.h>
  70 #include <vm/vm_kern.h>
  71 #include <vm/pmap.h>
  72 #include <stdarg.h>
  73 #if !MACH_KDP
  74 #include <kdp/kdp_udp.h>
  75 #endif
  76
  77 #if defined(__i386__) || defined(__x86_64__)
  78 #include <i386/cpu_threads.h>
  79 #include <i386/pmCPU.h>
  80 #endif
  81
  82 #include <IOKit/IOPlatformExpert.h>
  83 #include <machine/pal_routines.h>
  84
  85 #include <sys/kdebug.h>
  86 #include <libkern/OSKextLibPrivate.h>
  87 #include <libkern/OSAtomic.h>
  88 #include <libkern/kernel_mach_header.h>
  89 #include <uuid/uuid.h>
  90
  91 unsigned int    halt_in_debugger = 0;
  92 unsigned int    switch_debugger = 0;
  93 unsigned int    current_debugger = 0;
  94 unsigned int    active_debugger = 0;
  95 unsigned int    debug_mode=0;
  96 unsigned int    disable_debug_output = TRUE;
  97 unsigned int    systemLogDiags = FALSE;
  98 unsigned int    panicDebugging = FALSE;
  99 unsigned int    logPanicDataToScreen = FALSE;
 100
 101 int mach_assert = 1;
 102
 103 const char              *panicstr = (char *) 0;
 104 decl_simple_lock_data(,panic_lock)
 105 int                     paniccpu;
 106 volatile int            panicwait;
 107 volatile unsigned int   nestedpanic= 0;
 108 unsigned int            panic_is_inited = 0;
 109 unsigned int            return_on_panic = 0;
 110 unsigned long           panic_caller;
 111
 112 #define DEBUG_BUF_SIZE (3 * PAGE_SIZE)
 113
 114 char debug_buf[DEBUG_BUF_SIZE];
 115 char *debug_buf_ptr = debug_buf;
 116 unsigned int debug_buf_size = sizeof(debug_buf);
 117
 118 static char model_name[64];
 119 unsigned char *kernel_uuid;
 120 /* uuid_string_t */ char kernel_uuid_string[37];
 121
 122 static spl_t panic_prologue(const char *str);
 123 static void panic_epilogue(spl_t s);
 124
 125 struct pasc {
 126   unsigned a: 7;
 127   unsigned b: 7;
 128   unsigned c: 7;
 129   unsigned d: 7;
 130   unsigned e: 7;
 131   unsigned f: 7;
 132   unsigned g: 7;
 133   unsigned h: 7;
 134 }  __attribute__((packed));
 135
 136 typedef struct pasc pasc_t;
 137
 138 /* Prevent CPP from breaking the definition below */
 139 #if CONFIG_NO_PANIC_STRINGS
 140 #undef Assert
 141 #endif
 142
 143 void
 144 Assert(
 145         const char      *file,
 146         int             line,
 147         const char      *expression
 148       )
 149 {
 150         int saved_return_on_panic;
 151
 152         if (!mach_assert) {
 153                 return;
 154         }
 155
 156         saved_return_on_panic = return_on_panic;
 157
 158         /*
 159          * If we don't have a debugger configured, returning from an
 160          * assert is a bad, bad idea; there is no guarantee that we
 161          * didn't simply assert before we were able to restart the
 162          * platform.
 163          */
 164         if (current_debugger != NO_CUR_DB)
 165                 return_on_panic = 1;
 166
 167         panic_plain("%s:%d Assertion failed: %s", file, line, expression);
 168
 169         return_on_panic = saved_return_on_panic;
 170 }
 171
 172 /*
 173  *      Carefully use the panic_lock.  There's always a chance that
 174  *      somehow we'll call panic before getting to initialize the
 175  *      panic_lock -- in this case, we'll assume that the world is
 176  *      in uniprocessor mode and just avoid using the panic lock.
 177  */
 178 #define PANIC_LOCK()                                                    \
 179 MACRO_BEGIN                                                             \
 180         if (panic_is_inited)                                            \
 181                 simple_lock(&panic_lock);                               \
 182 MACRO_END
 183
 184 #define PANIC_UNLOCK()                                                  \
 185 MACRO_BEGIN                                                             \
 186         if (panic_is_inited)                                            \
 187                 simple_unlock(&panic_lock);                             \
 188 MACRO_END
 189
 190 void
 191 panic_init(void)
 192 {
 193         unsigned long uuidlen = 0;
 194         void *uuid;
 195
 196         uuid = getuuidfromheader(&_mh_execute_header, &uuidlen);
 197         if ((uuid != NULL) && (uuidlen == sizeof(uuid_t))) {
 198                 kernel_uuid = uuid;
 199                 uuid_unparse_upper(*(uuid_t *)uuid, kernel_uuid_string);
 200         }
 201
 202         simple_lock_init(&panic_lock, 0);
 203         panic_is_inited = 1;
 204         panic_caller = 0;
 205 }
 206
 207 void
 208 debug_log_init(void)
 209 {
 210         if (debug_buf_size != 0)
 211                 return;
 212         debug_buf_ptr = debug_buf;
 213         debug_buf_size = sizeof(debug_buf);
 214 }
 215
 216 #if defined(__i386__) || defined(__x86_64__)
 217 #define panic_stop()    pmCPUHalt(PM_HALT_PANIC)
 218 #define panic_safe()    pmSafeMode(x86_lcpu(), PM_SAFE_FL_SAFE)
 219 #define panic_normal()  pmSafeMode(x86_lcpu(), PM_SAFE_FL_NORMAL)
 220 #else
 221 #define panic_stop()    { while (1) ; }
 222 #define panic_safe()
 223 #define panic_normal()
 224 #endif
 225
 226 /*
 227  * Prevent CPP from breaking the definition below,
 228  * since all clients get a #define to prepend line numbers
 229  */
 230 #undef panic
 231
 232 void _consume_panic_args(int a __unused, ...)
 233 {
 234     panic("panic");
 235 }
 236
 237 static spl_t
 238 panic_prologue(const char *str)
 239 {
 240         spl_t   s;
 241
 242         if (kdebug_enable) {
 243                 if (get_preemption_level() == 0 && !ml_at_interrupt_context()) {
 244                         ml_set_interrupts_enabled(TRUE);
 245                         kdbg_dump_trace_to_file("/var/tmp/panic.trace");
 246                 }
 247         }
 248
 249         s = splhigh();
 250         disable_preemption();
 251
 252 #if     defined(__i386__) || defined(__x86_64__)
 253         /* Attempt to display the unparsed panic string */
 254         const char *tstr = str;
 255
 256         kprintf("Panic initiated, string: ");
 257         while (tstr && *tstr)
 258                 kprintf("%c", *tstr++);
 259         kprintf("\n");
 260 #endif
 261
 262         panic_safe();
 263
 264         if( logPanicDataToScreen )
 265                 disable_debug_output = FALSE;
 266
 267         debug_mode = TRUE;
 268
 269 restart:
 270         PANIC_LOCK();
 271
 272         if (panicstr) {
 273                 if (cpu_number() != paniccpu) {
 274                         PANIC_UNLOCK();
 275                         /*
 276                          * Wait until message has been printed to identify correct
 277                          * cpu that made the first panic.
 278                          */
 279                         while (panicwait)
 280                                 continue;
 281                         goto restart;
 282             } else {
 283                         nestedpanic +=1;
 284                         PANIC_UNLOCK();
 285                         Debugger("double panic");
 286                         printf("double panic:  We are hanging here...\n");
 287                         panic_stop();
 288                         /* NOTREACHED */
 289                 }
 290         }
 291         panicstr = str;
 292         paniccpu = cpu_number();
 293         panicwait = 1;
 294
 295         PANIC_UNLOCK();
 296         return(s);
 297 }
 298
 299
 300 static void
 301 panic_epilogue(spl_t    s)
 302 {
 303         /*
 304          * Release panicstr so that we can handle normally other panics.
 305          */
 306         PANIC_LOCK();
 307         panicstr = (char *)0;
 308         PANIC_UNLOCK();
 309
 310         if (return_on_panic) {
 311                 panic_normal();
 312                 enable_preemption();
 313                 splx(s);
 314                 return;
 315         }
 316         kdb_printf("panic: We are hanging here...\n");
 317         panic_stop();
 318         /* NOTREACHED */
 319 }
 320
 321 void
 322 panic(const char *str, ...)
 323 {
 324         va_list listp;
 325         spl_t   s;
 326
 327
 328         /* panic_caller is initialized to 0.  If set, don't change it */
 329         if ( ! panic_caller )
 330                 panic_caller = (unsigned long)(char *)__builtin_return_address(0);
 331
 332         s = panic_prologue(str);
 333         kdb_printf("panic(cpu %d caller 0x%lx): ", (unsigned) paniccpu, panic_caller);
 334         if (str) {
 335                 va_start(listp, str);
 336                 _doprnt(str, &listp, consdebug_putc, 0);
 337                 va_end(listp);
 338         }
 339         kdb_printf("\n");
 340
 341         /*
 342          * Release panicwait indicator so that other cpus may call Debugger().
 343          */
 344         panicwait = 0;
 345         Debugger("panic");
 346         panic_epilogue(s);
 347 }
 348
 349 void
 350 panic_context(unsigned int reason, void *ctx, const char *str, ...)
 351 {
 352         va_list listp;
 353         spl_t   s;
 354
 355
 356         /* panic_caller is initialized to 0.  If set, don't change it */
 357         if ( ! panic_caller )
 358                 panic_caller = (unsigned long)(char *)__builtin_return_address(0);
 359
 360         s = panic_prologue(str);
 361         kdb_printf("panic(cpu %d caller 0x%lx): ", (unsigned) paniccpu, panic_caller);
 362         if (str) {
 363                 va_start(listp, str);
 364                 _doprnt(str, &listp, consdebug_putc, 0);
 365                 va_end(listp);
 366         }
 367         kdb_printf("\n");
 368
 369         /*
 370          * Release panicwait indicator so that other cpus may call Debugger().
 371          */
 372         panicwait = 0;
 373         DebuggerWithContext(reason, ctx, "panic");
 374         panic_epilogue(s);
 375 }
 376
 377 void
 378 log(__unused int level, char *fmt, ...)
 379 {
 380         va_list listp;
 381
 382 #ifdef lint
 383         level++;
 384 #endif /* lint */
 385 #ifdef  MACH_BSD
 386         disable_preemption();
 387         va_start(listp, fmt);
 388         _doprnt(fmt, &listp, conslog_putc, 0);
 389         va_end(listp);
 390         enable_preemption();
 391 #endif
 392 }
 393
 394 void
 395 debug_putc(char c)
 396 {
 397         if ((debug_buf_size != 0) &&
 398                 ((debug_buf_ptr-debug_buf) < (int)debug_buf_size)) {
 399                 *debug_buf_ptr=c;
 400                 debug_buf_ptr++;
 401         }
 402 }
 403
 404 /* In-place packing routines -- inefficient, but they're called at most once.
 405  * Assumes "buflen" is a multiple of 8.
 406  */
 407
 408 int packA(char *inbuf, uint32_t length, uint32_t buflen)
 409 {
 410   unsigned int i, j = 0;
 411   pasc_t pack;
 412
 413   length = MIN(((length + 7) & ~7), buflen);
 414
 415   for (i = 0; i < length; i+=8)
 416     {
 417       pack.a = inbuf[i];
 418       pack.b = inbuf[i+1];
 419       pack.c = inbuf[i+2];
 420       pack.d = inbuf[i+3];
 421       pack.e = inbuf[i+4];
 422       pack.f = inbuf[i+5];
 423       pack.g = inbuf[i+6];
 424       pack.h = inbuf[i+7];
 425       bcopy ((char *) &pack, inbuf + j, 7);
 426       j += 7;
 427     }
 428   return j;
 429 }
 430
 431 void unpackA(char *inbuf, uint32_t length)
 432 {
 433         pasc_t packs;
 434         unsigned i = 0;
 435         length = (length * 8)/7;
 436
 437         while (i < length) {
 438           packs = *(pasc_t *)&inbuf[i];
 439           bcopy(&inbuf[i+7], &inbuf[i+8], MAX(0, (int) (length - i - 8)));
 440           inbuf[i++] = packs.a;
 441           inbuf[i++] = packs.b;
 442           inbuf[i++] = packs.c;
 443           inbuf[i++] = packs.d;
 444           inbuf[i++] = packs.e;
 445           inbuf[i++] = packs.f;
 446           inbuf[i++] = packs.g;
 447           inbuf[i++] = packs.h;
 448         }
 449 }
 450
 451 extern void *proc_name_address(void *p);
 452
 453 static void
 454 panic_display_process_name(void) {
 455         char proc_name[32] = "Unknown";
 456         task_t ctask = 0;
 457         void *cbsd_info = 0;
 458
 459         if (ml_nofault_copy((vm_offset_t)&current_thread()->task, (vm_offset_t) &ctask, sizeof(task_t)) == sizeof(task_t))
 460                 if(ml_nofault_copy((vm_offset_t)&ctask->bsd_info, (vm_offset_t)&cbsd_info, sizeof(&ctask->bsd_info)) == sizeof(&ctask->bsd_info))
 461                         if (cbsd_info && (ml_nofault_copy((vm_offset_t) proc_name_address(cbsd_info), (vm_offset_t) &proc_name, sizeof(proc_name)) > 0))
 462                                 proc_name[sizeof(proc_name) - 1] = '\0';
 463         kdb_printf("\nBSD process name corresponding to current thread: %s\n", proc_name);
 464 }
 465
 466 unsigned        panic_active(void) {
 467         return ((panicstr != (char *) 0));
 468 }
 469
 470 void populate_model_name(char *model_string) {
 471         strlcpy(model_name, model_string, sizeof(model_name));
 472 }
 473
 474 static void panic_display_model_name(void) {
 475         char tmp_model_name[sizeof(model_name)];
 476
 477         if (ml_nofault_copy((vm_offset_t) &model_name, (vm_offset_t) &tmp_model_name, sizeof(model_name)) != sizeof(model_name))
 478                 return;
 479
 480         tmp_model_name[sizeof(tmp_model_name) - 1] = '\0';
 481
 482         if (tmp_model_name[0] != 0)
 483                 kdb_printf("System model name: %s\n", tmp_model_name);
 484 }
 485
 486 static void panic_display_kernel_uuid(void) {
 487         char tmp_kernel_uuid[sizeof(kernel_uuid_string)];
 488
 489         if (ml_nofault_copy((vm_offset_t) &kernel_uuid_string, (vm_offset_t) &tmp_kernel_uuid, sizeof(kernel_uuid_string)) != sizeof(kernel_uuid_string))
 490                 return;
 491
 492         if (tmp_kernel_uuid[0] != '\0')
 493                 kdb_printf("Kernel UUID: %s\n", tmp_kernel_uuid);
 494 }
 495
 496 void panic_display_kernel_aslr(void) {
 497         if (vm_kernel_slide) {
 498                 kdb_printf("Kernel slide:     0x%016lx\n", (unsigned long) vm_kernel_slide);
 499                 kdb_printf("Kernel text base: %p\n", (void *) vm_kernel_stext);
 500         }
 501 }
 502
 503 static void panic_display_uptime(void) {
 504         uint64_t        uptime;
 505         absolutetime_to_nanoseconds(mach_absolute_time(), &uptime);
 506
 507         kdb_printf("\nSystem uptime in nanoseconds: %llu\n", uptime);
 508 }
 509
 510 extern const char version[];
 511 extern char osversion[];
 512
 513 static volatile uint32_t config_displayed = 0;
 514
 515 __private_extern__ void panic_display_system_configuration(void) {
 516
 517         panic_display_process_name();
 518         if (OSCompareAndSwap(0, 1, &config_displayed)) {
 519                 char buf[256];
 520                 if (strlcpy(buf, PE_boot_args(), sizeof(buf)))
 521                         kdb_printf("Boot args: %s\n", buf);
 522                 kdb_printf("\nMac OS version:\n%s\n",
 523                     (osversion[0] != 0) ? osversion : "Not yet set");
 524                 kdb_printf("\nKernel version:\n%s\n",version);
 525                 panic_display_kernel_uuid();
 526                 panic_display_kernel_aslr();
 527                 panic_display_pal_info();
 528                 panic_display_model_name();
 529                 panic_display_uptime();
 530                 panic_display_zprint();
 531 #if CONFIG_ZLEAKS
 532                 panic_display_ztrace();
 533 #endif /* CONFIG_ZLEAKS */
 534                 kext_dump_panic_lists(&kdb_log);
 535         }
 536 }
 537
 538 extern zone_t           first_zone;
 539 extern unsigned int     num_zones, stack_total;
 540 extern unsigned long long stack_allocs;
 541
 542 #if defined(__i386__) || defined (__x86_64__)
 543 extern unsigned int     inuse_ptepages_count;
 544 extern long long alloc_ptepages_count;
 545 #endif
 546
 547 extern boolean_t        panic_include_zprint;
 548
 549 __private_extern__ void panic_display_zprint()
 550 {
 551         if(panic_include_zprint == TRUE) {
 552
 553                 unsigned int    i;
 554                 struct zone     zone_copy;
 555
 556                 if(first_zone!=NULL) {
 557                         if(ml_nofault_copy((vm_offset_t)first_zone, (vm_offset_t)&zone_copy, sizeof(struct zone)) == sizeof(struct zone)) {
 558                                 for (i = 0; i < num_zones; i++) {
 559                                         if(zone_copy.cur_size > (1024*1024)) {
 560                                                 kdb_printf("%.20s:%lu\n",zone_copy.zone_name,(uintptr_t)zone_copy.cur_size);
 561                                         }
 562
 563                                         if(zone_copy.next_zone == NULL) {
 564                                                 break;
 565                                         }
 566
 567                                         if(ml_nofault_copy((vm_offset_t)zone_copy.next_zone, (vm_offset_t)&zone_copy, sizeof(struct zone)) != sizeof(struct zone)) {
 568                                                 break;
 569                                         }
 570                                 }
 571                         }
 572                 }
 573
 574                 kdb_printf("Kernel Stacks:%lu\n",(uintptr_t)(kernel_stack_size * stack_total));
 575
 576 #if defined(__i386__) || defined (__x86_64__)
 577                 kdb_printf("PageTables:%lu\n",(uintptr_t)(PAGE_SIZE * inuse_ptepages_count));
 578 #endif
 579
 580                 kdb_printf("Kalloc.Large:%lu\n",(uintptr_t)kalloc_large_total);
 581         }
 582 }
 583
 584 #if CONFIG_ZLEAKS
 585 extern boolean_t        panic_include_ztrace;
 586 extern struct ztrace* top_ztrace;
 587 /*
 588  * Prints the backtrace most suspected of being a leaker, if we paniced in the zone allocator.
 589  * top_ztrace and panic_include_ztrace comes from osfmk/kern/zalloc.c
 590  */
 591 __private_extern__ void panic_display_ztrace(void)
 592 {
 593         if(panic_include_ztrace == TRUE) {
 594                 unsigned int i = 0;
 595                 struct ztrace top_ztrace_copy;
 596
 597                 /* Make sure not to trip another panic if there's something wrong with memory */
 598                 if(ml_nofault_copy((vm_offset_t)top_ztrace, (vm_offset_t)&top_ztrace_copy, sizeof(struct ztrace)) == sizeof(struct ztrace)) {
 599                         kdb_printf("\nBacktrace suspected of leaking: (outstanding bytes: %lu)\n", (uintptr_t)top_ztrace_copy.zt_size);
 600                         /* Print the backtrace addresses */
 601                         for (i = 0; (i < top_ztrace_copy.zt_depth && i < MAX_ZTRACE_DEPTH) ; i++) {
 602                                 kdb_printf("%p\n", top_ztrace_copy.zt_stack[i]);
 603                         }
 604                         /* Print any kexts in that backtrace, along with their link addresses so we can properly blame them */
 605                         kmod_panic_dump((vm_offset_t *)&top_ztrace_copy.zt_stack[0], top_ztrace_copy.zt_depth);
 606                 }
 607                 else {
 608                         kdb_printf("\nCan't access top_ztrace...\n");
 609                 }
 610                 kdb_printf("\n");
 611         }
 612 }
 613 #endif /* CONFIG_ZLEAKS */
 614
 615 #if !MACH_KDP
 616 static struct kdp_ether_addr kdp_current_mac_address = {{0, 0, 0, 0, 0, 0}};
 617
 618 /* XXX ugly forward declares to stop warnings */
 619 void *kdp_get_interface(void);
 620 void kdp_set_ip_and_mac_addresses(struct kdp_in_addr *, struct kdp_ether_addr *);
 621 void kdp_set_gateway_mac(void *);
 622 void kdp_set_interface(void *);
 623 void kdp_register_send_receive(void *, void *);
 624 void kdp_unregister_send_receive(void *, void *);
 625 void kdp_snapshot_preflight(int, void *, uint32_t, uint32_t);
 626 int kdp_stack_snapshot_geterror(void);
 627 int kdp_stack_snapshot_bytes_traced(void);
 628
 629 void *
 630 kdp_get_interface( void)
 631 {
 632         return(void *)0;
 633 }
 634
 635 unsigned int
 636 kdp_get_ip_address(void )
 637 { return 0; }
 638
 639 struct kdp_ether_addr
 640 kdp_get_mac_addr(void)
 641 {
 642         return kdp_current_mac_address;
 643 }
 644
 645 void
 646 kdp_set_ip_and_mac_addresses(
 647         __unused struct kdp_in_addr          *ipaddr,
 648         __unused struct kdp_ether_addr       *macaddr)
 649 {}
 650
 651 void
 652 kdp_set_gateway_mac(__unused void *gatewaymac)
 653 {}
 654
 655 void
 656 kdp_set_interface(__unused void *ifp)
 657 {}
 658
 659 void
 660 kdp_register_send_receive(__unused void *send, __unused void *receive)
 661 {}
 662
 663 void
 664 kdp_unregister_send_receive(__unused void *send, __unused void *receive)
 665 {}
 666
 667 void
 668 kdp_snapshot_preflight(__unused int pid, __unused void * tracebuf,
 669                 __unused uint32_t tracebuf_size, __unused uint32_t options)
 670 {}
 671
 672 int
 673 kdp_stack_snapshot_geterror(void)
 674 {
 675         return -1;
 676 }
 677
 678 int
 679 kdp_stack_snapshot_bytes_traced(void)
 680 {
 681         return 0;
 682 }
 683
 684 #endif
 685
 686 #if !CONFIG_TELEMETRY
 687 int telemetry_gather(user_addr_t buffer __unused, uint32_t *length __unused, boolean_t mark __unused)
 688 {
 689         return KERN_NOT_SUPPORTED;
 690 }
 691 #endif