kdb.h revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Marcel Moolenaar 5 * All rights reserved. 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 the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD: stable/11/sys/sys/kdb.h 330897 2018-03-14 03:19:51Z eadler $ 29 */ 30 31#ifndef _SYS_KDB_H_ 32#define _SYS_KDB_H_ 33 34#include <machine/setjmp.h> 35 36struct pcb; 37struct thread; 38struct trapframe; 39 40typedef int dbbe_init_f(void); 41typedef void dbbe_trace_f(void); 42typedef void dbbe_trace_thread_f(struct thread *); 43typedef int dbbe_trap_f(int, int); 44 45struct kdb_dbbe { 46 const char *dbbe_name; 47 dbbe_init_f *dbbe_init; 48 dbbe_trace_f *dbbe_trace; 49 dbbe_trace_thread_f *dbbe_trace_thread; 50 dbbe_trap_f *dbbe_trap; 51 int dbbe_active; 52}; 53 54#define KDB_BACKEND(name, init, trace, trace_thread, trap) \ 55 static struct kdb_dbbe name##_dbbe = { \ 56 .dbbe_name = #name, \ 57 .dbbe_init = init, \ 58 .dbbe_trace = trace, \ 59 .dbbe_trace_thread = trace_thread, \ 60 .dbbe_trap = trap \ 61 }; \ 62 DATA_SET(kdb_dbbe_set, name##_dbbe) 63 64extern u_char kdb_active; /* Non-zero while in debugger. */ 65extern int debugger_on_panic; /* enter the debugger on panic. */ 66extern struct kdb_dbbe *kdb_dbbe; /* Default debugger backend or NULL. */ 67extern struct trapframe *kdb_frame; /* Frame to kdb_trap(). */ 68extern struct pcb *kdb_thrctx; /* Current context. */ 69extern struct thread *kdb_thread; /* Current thread. */ 70 71int kdb_alt_break(int, int *); 72int kdb_alt_break_gdb(int, int *); 73int kdb_break(void); 74void kdb_backtrace(void); 75void kdb_backtrace_thread(struct thread *); 76int kdb_dbbe_select(const char *); 77void kdb_enter(const char *, const char *); 78void kdb_init(void); 79void * kdb_jmpbuf(jmp_buf); 80void kdb_panic(const char *); 81void kdb_reboot(void); 82void kdb_reenter(void); 83struct pcb *kdb_thr_ctx(struct thread *); 84struct thread *kdb_thr_first(void); 85struct thread *kdb_thr_from_pid(pid_t); 86struct thread *kdb_thr_lookup(lwpid_t); 87struct thread *kdb_thr_next(struct thread *); 88int kdb_thr_select(struct thread *); 89int kdb_trap(int, int, struct trapframe *); 90 91/* 92 * KDB enters the debugger via breakpoint(), which leaves the debugger without 93 * a lot of information about why it was entered. This simple enumerated set 94 * captures some basic information. 95 * 96 * It is recommended that values here be short (<16 character) alpha-numeric 97 * strings, as they will be used to construct DDB(4) script names. 98 */ 99extern const char * volatile kdb_why; 100#define KDB_WHY_UNSET NULL /* No reason set. */ 101#define KDB_WHY_PANIC "panic" /* panic() was called. */ 102#define KDB_WHY_KASSERT "kassert" /* kassert failed. */ 103#define KDB_WHY_SYSCTL "sysctl" /* Sysctl entered debugger. */ 104#define KDB_WHY_BOOTFLAGS "bootflags" /* Boot flags were set. */ 105#define KDB_WHY_WITNESS "witness" /* Witness entered debugger. */ 106#define KDB_WHY_VFSLOCK "vfslock" /* VFS detected lock problem. */ 107#define KDB_WHY_NETGRAPH "netgraph" /* Netgraph entered debugger. */ 108#define KDB_WHY_BREAK "break" /* Console or serial break. */ 109#define KDB_WHY_WATCHDOG "watchdog" /* Watchdog entered debugger. */ 110#define KDB_WHY_CAM "cam" /* CAM has entered debugger. */ 111#define KDB_WHY_NDIS "ndis" /* NDIS entered debugger. */ 112#define KDB_WHY_ACPI "acpi" /* ACPI entered debugger. */ 113#define KDB_WHY_TRAPSIG "trapsig" /* Sparc fault. */ 114#define KDB_WHY_POWERFAIL "powerfail" /* Powerfail NMI. */ 115#define KDB_WHY_MAC "mac" /* MAC Framework. */ 116#define KDB_WHY_POWERPC "powerpc" /* Unhandled powerpc intr. */ 117#define KDB_WHY_UNIONFS "unionfs" /* Unionfs bug. */ 118#define KDB_WHY_DTRACE "dtrace" /* DTrace action entered debugger. */ 119 120/* Return values for kdb_alt_break */ 121#define KDB_REQ_DEBUGGER 1 /* User requested Debugger */ 122#define KDB_REQ_PANIC 2 /* User requested a panic */ 123#define KDB_REQ_REBOOT 3 /* User requested a clean reboot */ 124 125#endif /* !_SYS_KDB_H_ */ 126