#include <sys/cdefs.h>
#include "opt_kdb.h"
#include "opt_stack.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cons.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/smp.h>
#include <sys/stack.h>
#include <sys/sysctl.h>
#include <machine/kdb.h>
#include <machine/pcb.h>

Include dependency graph for subr_kdb.c:

Macros
#define	KDB_BREAK_TO_DEBUGGER 0

#define	KDB_ALT_BREAK_TO_DEBUGGER 0

#define	KEY_CR 13 /* CR '\r' */

#define	KEY_TILDE 126 /* ~ */

#define	KEY_CRTLB 2 /* ^B */

#define	KEY_CRTLP 16 /* ^P */

#define	KEY_CRTLR 18 /* ^R */

Enumerations
enum	{ KDB_ALT_BREAK_SEEN_NONE , KDB_ALT_BREAK_SEEN_CR , KDB_ALT_BREAK_SEEN_CR_TILDE }

Functions
	__FBSDID ("$FreeBSD$")

	KDB_BACKEND (null, NULL, NULL, NULL, NULL)

static int	kdb_sysctl_available (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_current (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_enter (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_panic (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_panic_str (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_trap (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_trap_code (SYSCTL_HANDLER_ARGS)

static int	kdb_sysctl_stack_overflow (SYSCTL_HANDLER_ARGS)

static	SYSCTL_NODE (_debug, OID_AUTO, kdb, CTLFLAG_RW\|CTLFLAG_MPSAFE, NULL, "KDB nodes")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, available, CTLTYPE_STRING\|CTLFLAG_RD\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_available, "A", "list of available KDB backends")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, current, CTLTYPE_STRING\|CTLFLAG_RW\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_current, "A", "currently selected KDB backend")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, enter, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_enter, "I", "set to enter the debugger")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, panic, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_panic, "I", "set to panic the kernel")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, panic_str, CTLTYPE_STRING\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_panic_str, "A", "trigger a kernel panic, using the provided string as the panic message")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, trap, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_trap, "I", "set to cause a page fault via data access")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, trap_code, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_trap_code, "I", "set to cause a page fault via code access")

	SYSCTL_PROC (_debug_kdb, OID_AUTO, stack_overflow, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|CTLFLAG_MPSAFE, NULL, 0, kdb_sysctl_stack_overflow, "I", "set to cause a stack overflow")

	SYSCTL_INT (_debug_kdb, OID_AUTO, break_to_debugger, CTLFLAG_RWTUN\|CTLFLAG_SECURE, &kdb_break_to_debugger, 0, "Enable break to debugger")

	SYSCTL_INT (_debug_kdb, OID_AUTO, alt_break_to_debugger, CTLFLAG_RWTUN\|CTLFLAG_SECURE, &kdb_alt_break_to_debugger, 0, "Enable alternative break to debugger")

static void	kdb_stack_overflow (volatile int *x) __noinline

void	kdb_panic (const char *msg)

void	kdb_reboot (void)

int	kdb_break (void)

static int	kdb_alt_break_state (int key, int *state)

static int	kdb_alt_break_internal (int key, int *state, int force_gdb)

int	kdb_alt_break (int key, int *state)

int	kdb_alt_break_gdb (int key, int *state)

void	kdb_backtrace (void)

void	kdb_backtrace_thread (struct thread *td)

int	kdb_dbbe_select (const char *name)

void	kdb_enter (const char why, const char msg)

void	kdb_init (void)

void *	kdb_jmpbuf (jmp_buf new)

void	kdb_reenter (void)

void	kdb_reenter_silent (void)

struct pcb *	kdb_thr_ctx (struct thread *thr)

struct thread *	kdb_thr_first (void)

struct thread *	kdb_thr_from_pid (pid_t pid)

struct thread *	kdb_thr_lookup (lwpid_t tid)

struct thread *	kdb_thr_next (struct thread *thr)

int	kdb_thr_select (struct thread *thr)

int	kdb_trap (int type, int code, struct trapframe *tf)

Variables
u_char __read_frequently	kdb_active = 0

static void *	kdb_jmpbufp = NULL

struct kdb_dbbe *	kdb_dbbe = NULL

static struct pcb	kdb_pcb

struct pcb *	kdb_thrctx = NULL

struct thread *	kdb_thread = NULL

struct trapframe *	kdb_frame = NULL

static int	kdb_break_to_debugger = KDB_BREAK_TO_DEBUGGER

static int	kdb_alt_break_to_debugger = KDB_ALT_BREAK_TO_DEBUGGER

const char *volatile	kdb_why = KDB_WHY_UNSET

Macro Definition Documentation

◆ KDB_ALT_BREAK_TO_DEBUGGER

#define KDB_ALT_BREAK_TO_DEBUGGER 0

Definition at line 73 of file subr_kdb.c.

◆ KDB_BREAK_TO_DEBUGGER

#define KDB_BREAK_TO_DEBUGGER 0

Definition at line 67 of file subr_kdb.c.

◆ KEY_CR

#define KEY_CR 13 /* CR '\r' */

Definition at line 317 of file subr_kdb.c.

◆ KEY_CRTLB

#define KEY_CRTLB 2 /* ^B */

Definition at line 319 of file subr_kdb.c.

◆ KEY_CRTLP

#define KEY_CRTLP 16 /* ^P */

Definition at line 320 of file subr_kdb.c.

◆ KEY_CRTLR

#define KEY_CRTLR 18 /* ^R */

Definition at line 321 of file subr_kdb.c.

◆ KEY_TILDE

#define KEY_TILDE 126 /* ~ */

Definition at line 318 of file subr_kdb.c.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
KDB_ALT_BREAK_SEEN_NONE
KDB_ALT_BREAK_SEEN_CR
KDB_ALT_BREAK_SEEN_CR_TILDE

Definition at line 324 of file subr_kdb.c.

Function Documentation

◆ __FBSDID()

__FBSDID ( "$FreeBSD$" )

◆ kdb_alt_break()

int kdb_alt_break	(	int	key,
		int *	state
	)

Definition at line 404 of file subr_kdb.c.

References kdb_alt_break_internal().

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◆ kdb_alt_break_gdb()

int kdb_alt_break_gdb	(	int	key,
		int *	state
	)

Definition at line 416 of file subr_kdb.c.

References kdb_alt_break_internal().

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◆ kdb_alt_break_internal()

static int kdb_alt_break_internal	(	int	key,
		int *	state,
		int	force_gdb
	)

static

Definition at line 376 of file subr_kdb.c.

References kdb_alt_break_state(), kdb_alt_break_to_debugger, kdb_dbbe_select(), kdb_enter(), kdb_panic(), and kdb_reboot().

Referenced by kdb_alt_break(), and kdb_alt_break_gdb().

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◆ kdb_alt_break_state()

static int kdb_alt_break_state	(	int	key,
		int *	state
	)

static

Definition at line 341 of file subr_kdb.c.

References KDB_ALT_BREAK_SEEN_CR, KDB_ALT_BREAK_SEEN_CR_TILDE, KDB_ALT_BREAK_SEEN_NONE, KEY_CR, KEY_CRTLB, KEY_CRTLP, KEY_CRTLR, and KEY_TILDE.

Referenced by kdb_alt_break_internal().

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◆ KDB_BACKEND()

KDB_BACKEND	(	null	,
		NULL	,
		NULL	,
		NULL	,
		NULL
	)

◆ kdb_backtrace()

void kdb_backtrace ( void )

Definition at line 429 of file subr_kdb.c.

References kdb_dbbe, printf(), st, stack_print_ddb(), and stack_zero().

Referenced by _isitmyx(), adopt(), kdb_reenter(), kdb_switch(), sdt_probe_stub(), vpanic(), and watchdog_fire().

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◆ kdb_backtrace_thread()

void kdb_backtrace_thread ( struct thread * td )

Definition at line 453 of file subr_kdb.c.

References kdb_dbbe, printf(), st, and stack_print_ddb().

Referenced by propagate_priority().

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◆ kdb_break()

int kdb_break ( void )

Definition at line 331 of file subr_kdb.c.

References kdb_break_to_debugger, and kdb_enter().

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◆ kdb_dbbe_select()

int kdb_dbbe_select ( const char * name )

Definition at line 475 of file subr_kdb.c.

References kdb_dbbe, and name.

Referenced by kdb_alt_break_internal(), and kdb_sysctl_current().

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◆ kdb_enter()

void kdb_enter	(	const char *	why,
		const char *	msg
	)

Definition at line 498 of file subr_kdb.c.

References kdb_active, kdb_dbbe, kdb_why, and printf().

Referenced by kdb_alt_break_internal(), kdb_break(), kdb_sysctl_enter(), vpanic(), watchdog_fire(), and witness_enter_debugger().

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◆ kdb_init()

void kdb_init ( void )

Definition at line 514 of file subr_kdb.c.

References kdb_active, kdb_dbbe, and printf().

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◆ kdb_jmpbuf()

void * kdb_jmpbuf ( jmp_buf new )

Definition at line 548 of file subr_kdb.c.

References kdb_jmpbufp.

◆ kdb_panic()

void kdb_panic ( const char * msg )

Definition at line 292 of file subr_kdb.c.

References panic(), and printf().

Referenced by kdb_alt_break_internal().

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◆ kdb_reboot()

void kdb_reboot ( void )

Definition at line 300 of file subr_kdb.c.

References printf(), and shutdown_nice().

Referenced by kdb_alt_break_internal().

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◆ kdb_reenter()

void kdb_reenter ( void )

Definition at line 558 of file subr_kdb.c.

References kdb_active, kdb_backtrace(), kdb_jmpbufp, and printf().

Referenced by kdb_switch().

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◆ kdb_reenter_silent()

void kdb_reenter_silent ( void )

Definition at line 571 of file subr_kdb.c.

References kdb_active, and kdb_jmpbufp.

◆ kdb_stack_overflow()

static void kdb_stack_overflow ( volatile int * x )

static

Definition at line 264 of file subr_kdb.c.

References kdb_stack_overflow().

Referenced by kdb_stack_overflow(), and kdb_sysctl_stack_overflow().

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◆ kdb_sysctl_available()

static int kdb_sysctl_available ( SYSCTL_HANDLER_ARGS )

static

Definition at line 147 of file subr_kdb.c.

References kdb_dbbe, sbuf_delete(), sbuf_finish(), sbuf_new_for_sysctl(), and sbuf_printf().

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◆ kdb_sysctl_current()

static int kdb_sysctl_current ( SYSCTL_HANDLER_ARGS )

static

Definition at line 164 of file subr_kdb.c.

References buf, kdb_active, kdb_dbbe, kdb_dbbe_select(), and sysctl_handle_string().

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◆ kdb_sysctl_enter()

static int kdb_sysctl_enter ( SYSCTL_HANDLER_ARGS )

static

Definition at line 182 of file subr_kdb.c.

References kdb_active, kdb_enter(), sysctl_handle_int(), and sysctl_wire_old_buffer().

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◆ kdb_sysctl_panic()

static int kdb_sysctl_panic ( SYSCTL_HANDLER_ARGS )

static

Definition at line 200 of file subr_kdb.c.

References panic(), sysctl_handle_int(), and sysctl_wire_old_buffer().

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◆ kdb_sysctl_panic_str()

static int kdb_sysctl_panic_str ( SYSCTL_HANDLER_ARGS )

static

Definition at line 216 of file subr_kdb.c.

References buf, panic(), and sysctl_handle_string().

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◆ kdb_sysctl_stack_overflow()

static int kdb_sysctl_stack_overflow ( SYSCTL_HANDLER_ARGS )

static

Definition at line 274 of file subr_kdb.c.

References kdb_stack_overflow(), sysctl_handle_int(), and sysctl_wire_old_buffer().

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◆ kdb_sysctl_trap()

static int kdb_sysctl_trap ( SYSCTL_HANDLER_ARGS )

static

Definition at line 230 of file subr_kdb.c.

References addr, sysctl_handle_int(), and sysctl_wire_old_buffer().

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◆ kdb_sysctl_trap_code()

static int kdb_sysctl_trap_code ( SYSCTL_HANDLER_ARGS )

static

Definition at line 246 of file subr_kdb.c.

References sysctl_handle_int(), and sysctl_wire_old_buffer().

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◆ kdb_thr_ctx()

struct pcb * kdb_thr_ctx ( struct thread * thr )

Definition at line 585 of file subr_kdb.c.

References kdb_pcb.

Referenced by kdb_thr_select().

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◆ kdb_thr_first()

struct thread * kdb_thr_first ( void )

Definition at line 605 of file subr_kdb.c.

References pidhash, and pidhashtbl.

Referenced by kdb_thr_lookup().

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◆ kdb_thr_from_pid()

struct thread * kdb_thr_from_pid ( pid_t pid )

Definition at line 626 of file subr_kdb.c.

◆ kdb_thr_lookup()

struct thread * kdb_thr_lookup ( lwpid_t tid )

Definition at line 638 of file subr_kdb.c.

References kdb_thr_first(), and kdb_thr_next().

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◆ kdb_thr_next()

struct thread * kdb_thr_next ( struct thread * thr )

Definition at line 649 of file subr_kdb.c.

References pidhash, and pidhashtbl.

Referenced by kdb_thr_lookup().

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◆ kdb_thr_select()

int kdb_thr_select ( struct thread * thr )

Definition at line 675 of file subr_kdb.c.

References kdb_thr_ctx(), kdb_thrctx, and kdb_thread.

Referenced by kdb_trap().

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◆ kdb_trap()

int kdb_trap	(	int	type,
		int	code,
		struct trapframe *	tf
	)

Definition at line 688 of file subr_kdb.c.

References all_cpus, cngrab(), cnungrab(), kdb_active, kdb_dbbe, kdb_frame, kdb_pcb, kdb_thr_select(), printf(), and type.

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◆ SYSCTL_INT() [1/2]

SYSCTL_INT	(	_debug_kdb	,
		OID_AUTO	,
		alt_break_to_debugger	,
		CTLFLAG_RWTUN\|	CTLFLAG_SECURE,
		&	kdb_alt_break_to_debugger,
		0	,
		"Enable alternative break to debugger"
	)

◆ SYSCTL_INT() [2/2]

SYSCTL_INT	(	_debug_kdb	,
		OID_AUTO	,
		break_to_debugger	,
		CTLFLAG_RWTUN\|	CTLFLAG_SECURE,
		&	kdb_break_to_debugger,
		0	,
		"Enable break to debugger"
	)

◆ SYSCTL_NODE()

static SYSCTL_NODE	(	_debug	,
		OID_AUTO	,
		kdb	,
		CTLFLAG_RW\|	CTLFLAG_MPSAFE,
		NULL	,
		"KDB nodes"
	)

static

◆ SYSCTL_PROC() [1/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		available	,
		CTLTYPE_STRING\|CTLFLAG_RD\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_available	,
		"A"	,
		"list of available KDB backends"
	)

◆ SYSCTL_PROC() [2/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		current	,
		CTLTYPE_STRING\|CTLFLAG_RW\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_current	,
		"A"	,
		"currently selected KDB backend"
	)

◆ SYSCTL_PROC() [3/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		enter	,
		CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_enter	,
		"I"	,
		"set to enter the debugger"
	)

◆ SYSCTL_PROC() [4/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		panic	,
		CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_panic	,
		"I"	,
		"set to panic the kernel"
	)

◆ SYSCTL_PROC() [5/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		panic_str	,
		CTLTYPE_STRING\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_panic_str	,
		"A"	,
		"trigger a kernel	panic,
		using the provided string as the panic message"
	)

◆ SYSCTL_PROC() [6/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		stack_overflow	,
		CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_stack_overflow	,
		"I"	,
		"set to cause a stack overflow"
	)

◆ SYSCTL_PROC() [7/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		trap	,
		CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_trap	,
		"I"	,
		"set to cause a page fault via data access"
	)

◆ SYSCTL_PROC() [8/8]

SYSCTL_PROC	(	_debug_kdb	,
		OID_AUTO	,
		trap_code	,
		CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_SECURE\|	CTLFLAG_MPSAFE,
		NULL	,
		0	,
		kdb_sysctl_trap_code	,
		"I"	,
		"set to cause a page fault via code access"
	)

Variable Documentation

◆ kdb_active

u_char __read_frequently kdb_active = 0

◆ kdb_alt_break_to_debugger

int kdb_alt_break_to_debugger = KDB_ALT_BREAK_TO_DEBUGGER

static

Definition at line 77 of file subr_kdb.c.

Referenced by kdb_alt_break_internal().

◆ kdb_break_to_debugger

int kdb_break_to_debugger = KDB_BREAK_TO_DEBUGGER

static

Definition at line 76 of file subr_kdb.c.

Referenced by kdb_break().

◆ kdb_dbbe

struct kdb_dbbe* kdb_dbbe = NULL

Definition at line 58 of file subr_kdb.c.

Referenced by kdb_backtrace(), kdb_backtrace_thread(), kdb_dbbe_select(), kdb_enter(), kdb_init(), kdb_sysctl_available(), kdb_sysctl_current(), and kdb_trap().

◆ kdb_frame

struct trapframe* kdb_frame = NULL

Definition at line 62 of file subr_kdb.c.

Referenced by kdb_trap().

◆ kdb_jmpbufp

void* kdb_jmpbufp = NULL

static

Definition at line 57 of file subr_kdb.c.

Referenced by kdb_jmpbuf(), kdb_reenter(), and kdb_reenter_silent().

◆ kdb_pcb

struct pcb kdb_pcb

static

Definition at line 59 of file subr_kdb.c.

Referenced by kdb_thr_ctx(), and kdb_trap().

◆ kdb_thrctx

struct pcb* kdb_thrctx = NULL

Definition at line 60 of file subr_kdb.c.

Referenced by kdb_thr_select().

◆ kdb_thread

struct thread* kdb_thread = NULL

Definition at line 61 of file subr_kdb.c.

Referenced by kdb_thr_select().

◆ kdb_why

const char* volatile kdb_why = KDB_WHY_UNSET

Definition at line 144 of file subr_kdb.c.

Referenced by kdb_enter().

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ KDB_ALT_BREAK_TO_DEBUGGER

◆ KDB_BREAK_TO_DEBUGGER

◆ KEY_CR

◆ KEY_CRTLB

◆ KEY_CRTLP

◆ KEY_CRTLR

◆ KEY_TILDE

Enumeration Type Documentation

◆ anonymous enum

Function Documentation

◆ __FBSDID()

◆ kdb_alt_break()

◆ kdb_alt_break_gdb()

◆ kdb_alt_break_internal()

◆ kdb_alt_break_state()

◆ KDB_BACKEND()

◆ kdb_backtrace()

◆ kdb_backtrace_thread()

◆ kdb_break()

◆ kdb_dbbe_select()

◆ kdb_enter()

◆ kdb_init()

◆ kdb_jmpbuf()

◆ kdb_panic()

◆ kdb_reboot()

◆ kdb_reenter()

◆ kdb_reenter_silent()

◆ kdb_stack_overflow()

◆ kdb_sysctl_available()

◆ kdb_sysctl_current()

◆ kdb_sysctl_enter()

◆ kdb_sysctl_panic()

◆ kdb_sysctl_panic_str()

◆ kdb_sysctl_stack_overflow()

◆ kdb_sysctl_trap()

◆ kdb_sysctl_trap_code()

◆ kdb_thr_ctx()

◆ kdb_thr_first()

◆ kdb_thr_from_pid()

◆ kdb_thr_lookup()

◆ kdb_thr_next()

◆ kdb_thr_select()

◆ kdb_trap()

◆ SYSCTL_INT() [1/2]

◆ SYSCTL_INT() [2/2]

◆ SYSCTL_NODE()

◆ SYSCTL_PROC() [1/8]

◆ SYSCTL_PROC() [2/8]

◆ SYSCTL_PROC() [3/8]

◆ SYSCTL_PROC() [4/8]

◆ SYSCTL_PROC() [5/8]

◆ SYSCTL_PROC() [6/8]

◆ SYSCTL_PROC() [7/8]

◆ SYSCTL_PROC() [8/8]

Variable Documentation

◆ kdb_active

◆ kdb_alt_break_to_debugger

◆ kdb_break_to_debugger

◆ kdb_dbbe

◆ kdb_frame

◆ kdb_jmpbufp

◆ kdb_pcb

◆ kdb_thrctx

◆ kdb_thread

◆ kdb_why