2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Marcel Moolenaar
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
34 #include <sys/linker_set.h>
35 #include <machine/setjmp.h>
41 typedef int dbbe_init_f(void);
42 typedef void dbbe_trace_f(void);
43 typedef void dbbe_trace_thread_f(struct thread *);
44 typedef int dbbe_trap_f(int, int);
47 const char *dbbe_name;
48 dbbe_init_f *dbbe_init;
49 dbbe_trace_f *dbbe_trace;
50 dbbe_trace_thread_f *dbbe_trace_thread;
51 dbbe_trap_f *dbbe_trap;
55 #define KDB_BACKEND(name, init, trace, trace_thread, trap) \
56 static struct kdb_dbbe name##_dbbe = { \
59 .dbbe_trace = trace, \
60 .dbbe_trace_thread = trace_thread, \
63 DATA_SET(kdb_dbbe_set, name##_dbbe)
65 SET_DECLARE(kdb_dbbe_set, struct kdb_dbbe);
67 extern u_char kdb_active; /* Non-zero while in debugger. */
68 extern int debugger_on_panic; /* enter the debugger on panic. */
69 extern int debugger_on_trap; /* enter the debugger on trap. */
70 extern struct kdb_dbbe *kdb_dbbe; /* Default debugger backend or NULL. */
71 extern struct trapframe *kdb_frame; /* Frame to kdb_trap(). */
72 extern struct pcb *kdb_thrctx; /* Current context. */
73 extern struct thread *kdb_thread; /* Current thread. */
75 int kdb_alt_break(int, int *);
76 int kdb_alt_break_gdb(int, int *);
78 void kdb_backtrace(void);
79 void kdb_backtrace_thread(struct thread *);
80 int kdb_dbbe_select(const char *);
81 void kdb_enter(const char *, const char *);
83 void * kdb_jmpbuf(jmp_buf);
84 void kdb_panic(const char *);
85 void kdb_reboot(void);
86 void kdb_reenter(void);
87 void kdb_reenter_silent(void);
88 struct pcb *kdb_thr_ctx(struct thread *);
89 struct thread *kdb_thr_first(void);
90 struct thread *kdb_thr_from_pid(pid_t);
91 struct thread *kdb_thr_lookup(lwpid_t);
92 struct thread *kdb_thr_next(struct thread *);
93 int kdb_thr_select(struct thread *);
94 int kdb_trap(int, int, struct trapframe *);
97 * KDB enters the debugger via breakpoint(), which leaves the debugger without
98 * a lot of information about why it was entered. This simple enumerated set
99 * captures some basic information.
101 * It is recommended that values here be short (<16 character) alpha-numeric
102 * strings, as they will be used to construct DDB(4) script names.
104 extern const char * volatile kdb_why;
105 #define KDB_WHY_UNSET NULL /* No reason set. */
106 #define KDB_WHY_PANIC "panic" /* panic() was called. */
107 #define KDB_WHY_KASSERT "kassert" /* kassert failed. */
108 #define KDB_WHY_TRAP "trap" /* Fatal trap. */
109 #define KDB_WHY_SYSCTL "sysctl" /* Sysctl entered debugger. */
110 #define KDB_WHY_BOOTFLAGS "bootflags" /* Boot flags were set. */
111 #define KDB_WHY_WITNESS "witness" /* Witness entered debugger. */
112 #define KDB_WHY_VFSLOCK "vfslock" /* VFS detected lock problem. */
113 #define KDB_WHY_NETGRAPH "netgraph" /* Netgraph entered debugger. */
114 #define KDB_WHY_BREAK "break" /* Console or serial break. */
115 #define KDB_WHY_WATCHDOG "watchdog" /* Watchdog entered debugger. */
116 #define KDB_WHY_CAM "cam" /* CAM has entered debugger. */
117 #define KDB_WHY_ACPI "acpi" /* ACPI entered debugger. */
118 #define KDB_WHY_TRAPSIG "trapsig" /* Sparc fault. */
119 #define KDB_WHY_POWERFAIL "powerfail" /* Powerfail NMI. */
120 #define KDB_WHY_MAC "mac" /* MAC Framework. */
121 #define KDB_WHY_POWERPC "powerpc" /* Unhandled powerpc intr. */
122 #define KDB_WHY_UNIONFS "unionfs" /* Unionfs bug. */
123 #define KDB_WHY_DTRACE "dtrace" /* DTrace action entered debugger. */
125 /* Return values for kdb_alt_break */
126 #define KDB_REQ_DEBUGGER 1 /* User requested Debugger */
127 #define KDB_REQ_PANIC 2 /* User requested a panic */
128 #define KDB_REQ_REBOOT 3 /* User requested a clean reboot */
130 /* Debug breakpoint/watchpoint access types */
131 #define KDB_DBG_ACCESS_EXEC 0
132 #define KDB_DBG_ACCESS_R 1
133 #define KDB_DBG_ACCESS_W 2
134 #define KDB_DBG_ACCESS_RW 3
136 #endif /* !_SYS_KDB_H_ */