The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/kdb.h

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    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/12/sys/sys/kdb.h 364002 2020-08-07 00:56:20Z mav $
   29  */
   30 
   31 #ifndef _SYS_KDB_H_
   32 #define _SYS_KDB_H_
   33 
   34 #include <machine/setjmp.h>
   35 
   36 struct pcb;
   37 struct thread;
   38 struct trapframe;
   39 
   40 typedef int dbbe_init_f(void);
   41 typedef void dbbe_trace_f(void);
   42 typedef void dbbe_trace_thread_f(struct thread *);
   43 typedef int dbbe_trap_f(int, int);
   44 
   45 struct 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 
   64 extern u_char kdb_active;               /* Non-zero while in debugger. */
   65 extern int debugger_on_panic;           /* enter the debugger on panic. */
   66 extern int debugger_on_trap;            /* enter the debugger on trap. */
   67 extern struct kdb_dbbe *kdb_dbbe;       /* Default debugger backend or NULL. */
   68 extern struct trapframe *kdb_frame;     /* Frame to kdb_trap(). */
   69 extern struct pcb *kdb_thrctx;          /* Current context. */
   70 extern struct thread *kdb_thread;       /* Current thread. */
   71 
   72 int     kdb_alt_break(int, int *);
   73 int     kdb_alt_break_gdb(int, int *);
   74 int     kdb_break(void);
   75 void    kdb_backtrace(void);
   76 void    kdb_backtrace_thread(struct thread *);
   77 int     kdb_dbbe_select(const char *);
   78 void    kdb_enter(const char *, const char *);
   79 void    kdb_init(void);
   80 void *  kdb_jmpbuf(jmp_buf);
   81 void    kdb_panic(const char *);
   82 void    kdb_reboot(void);
   83 void    kdb_reenter(void);
   84 void    kdb_reenter_silent(void);
   85 struct pcb *kdb_thr_ctx(struct thread *);
   86 struct thread *kdb_thr_first(void);
   87 struct thread *kdb_thr_from_pid(pid_t);
   88 struct thread *kdb_thr_lookup(lwpid_t);
   89 struct thread *kdb_thr_next(struct thread *);
   90 int     kdb_thr_select(struct thread *);
   91 int     kdb_trap(int, int, struct trapframe *);
   92 
   93 /*
   94  * KDB enters the debugger via breakpoint(), which leaves the debugger without
   95  * a lot of information about why it was entered.  This simple enumerated set
   96  * captures some basic information.
   97  *
   98  * It is recommended that values here be short (<16 character) alpha-numeric
   99  * strings, as they will be used to construct DDB(4) script names.
  100  */
  101 extern const char * volatile kdb_why;
  102 #define KDB_WHY_UNSET           NULL            /* No reason set. */
  103 #define KDB_WHY_PANIC           "panic"         /* panic() was called. */
  104 #define KDB_WHY_KASSERT         "kassert"       /* kassert failed. */
  105 #define KDB_WHY_TRAP            "trap"          /* Fatal trap. */
  106 #define KDB_WHY_SYSCTL          "sysctl"        /* Sysctl entered debugger. */
  107 #define KDB_WHY_BOOTFLAGS       "bootflags"     /* Boot flags were set. */
  108 #define KDB_WHY_WITNESS         "witness"       /* Witness entered debugger. */
  109 #define KDB_WHY_VFSLOCK         "vfslock"       /* VFS detected lock problem. */
  110 #define KDB_WHY_NETGRAPH        "netgraph"      /* Netgraph entered debugger. */
  111 #define KDB_WHY_BREAK           "break"         /* Console or serial break. */
  112 #define KDB_WHY_WATCHDOG        "watchdog"      /* Watchdog entered debugger. */
  113 #define KDB_WHY_CAM             "cam"           /* CAM has entered debugger. */
  114 #define KDB_WHY_NDIS            "ndis"          /* NDIS entered debugger. */
  115 #define KDB_WHY_ACPI            "acpi"          /* ACPI entered debugger. */
  116 #define KDB_WHY_TRAPSIG         "trapsig"       /* Sparc fault. */
  117 #define KDB_WHY_POWERFAIL       "powerfail"     /* Powerfail NMI. */
  118 #define KDB_WHY_MAC             "mac"           /* MAC Framework. */
  119 #define KDB_WHY_POWERPC         "powerpc"       /* Unhandled powerpc intr. */
  120 #define KDB_WHY_UNIONFS         "unionfs"       /* Unionfs bug. */
  121 #define KDB_WHY_DTRACE          "dtrace"        /* DTrace action entered debugger. */
  122 
  123 /* Return values for kdb_alt_break */
  124 #define KDB_REQ_DEBUGGER        1       /* User requested Debugger */
  125 #define KDB_REQ_PANIC           2       /* User requested a panic */
  126 #define KDB_REQ_REBOOT          3       /* User requested a clean reboot */
  127 
  128 #endif /* !_SYS_KDB_H_ */

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