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  * Copyright (c) 2004 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/9.0/sys/sys/kdb.h 225203 2011-08-26 21:46:36Z rwatson $
   27  */
   28 
   29 #ifndef _SYS_KDB_H_
   30 #define _SYS_KDB_H_
   31 
   32 #include <machine/setjmp.h>
   33 
   34 typedef int dbbe_init_f(void);
   35 typedef void dbbe_trace_f(void);
   36 typedef int dbbe_trap_f(int, int);
   37 
   38 struct kdb_dbbe {
   39         const char      *dbbe_name;
   40         dbbe_init_f     *dbbe_init;
   41         dbbe_trace_f    *dbbe_trace;
   42         dbbe_trap_f     *dbbe_trap;
   43         int             dbbe_active;
   44 };
   45 
   46 #define KDB_BACKEND(name, init, trace, trap)            \
   47         static struct kdb_dbbe name##_dbbe = {          \
   48                 .dbbe_name = #name,                     \
   49                 .dbbe_init = init,                      \
   50                 .dbbe_trace = trace,                    \
   51                 .dbbe_trap = trap                       \
   52         };                                              \
   53         DATA_SET(kdb_dbbe_set, name##_dbbe)
   54 
   55 struct pcb;
   56 struct thread;
   57 struct trapframe;
   58 
   59 extern int kdb_active;                  /* Non-zero while in debugger. */
   60 extern int debugger_on_panic;           /* enter the debugger on panic. */
   61 extern struct kdb_dbbe *kdb_dbbe;       /* Default debugger backend or NULL. */
   62 extern struct trapframe *kdb_frame;     /* Frame to kdb_trap(). */
   63 extern struct pcb *kdb_thrctx;          /* Current context. */
   64 extern struct thread *kdb_thread;       /* Current thread. */
   65 
   66 int     kdb_alt_break(int, int *);
   67 int     kdb_alt_break_gdb(int, int *);
   68 int     kdb_break(void);
   69 void    kdb_backtrace(void);
   70 int     kdb_dbbe_select(const char *);
   71 void    kdb_enter(const char *, const char *);
   72 void    kdb_init(void);
   73 void *  kdb_jmpbuf(jmp_buf);
   74 void    kdb_panic(const char *);
   75 void    kdb_reboot(void);
   76 void    kdb_reenter(void);
   77 struct pcb *kdb_thr_ctx(struct thread *);
   78 struct thread *kdb_thr_first(void);
   79 struct thread *kdb_thr_from_pid(pid_t);
   80 struct thread *kdb_thr_lookup(lwpid_t);
   81 struct thread *kdb_thr_next(struct thread *);
   82 int     kdb_thr_select(struct thread *);
   83 int     kdb_trap(int, int, struct trapframe *);
   84 
   85 /*
   86  * KDB enters the debugger via breakpoint(), which leaves the debugger without
   87  * a lot of information about why it was entered.  This simple enumerated set
   88  * captures some basic information.
   89  *
   90  * It is recommended that values here be short (<16 character) alpha-numeric
   91  * strings, as they will be used to construct DDB(4) script names.
   92  */
   93 extern const char * volatile kdb_why;
   94 #define KDB_WHY_UNSET           NULL            /* No reason set. */
   95 #define KDB_WHY_PANIC           "panic"         /* panic() was called. */
   96 #define KDB_WHY_SYSCTL          "sysctl"        /* Sysctl entered debugger. */
   97 #define KDB_WHY_BOOTFLAGS       "bootflags"     /* Boot flags were set. */
   98 #define KDB_WHY_WITNESS         "witness"       /* Witness entered debugger. */
   99 #define KDB_WHY_VFSLOCK         "vfslock"       /* VFS detected lock problem. */
  100 #define KDB_WHY_NETGRAPH        "netgraph"      /* Netgraph entered debugger. */
  101 #define KDB_WHY_BREAK           "break"         /* Console or serial break. */
  102 #define KDB_WHY_WATCHDOG        "watchdog"      /* Watchdog entered debugger. */
  103 #define KDB_WHY_CAM             "cam"           /* CAM has entered debugger. */
  104 #define KDB_WHY_NDIS            "ndis"          /* NDIS entered debugger. */
  105 #define KDB_WHY_ACPI            "acpi"          /* ACPI entered debugger. */
  106 #define KDB_WHY_TRAPSIG         "trapsig"       /* Sparc fault. */
  107 #define KDB_WHY_POWERFAIL       "powerfail"     /* Powerfail NMI. */
  108 #define KDB_WHY_MAC             "mac"           /* MAC Framework. */
  109 #define KDB_WHY_POWERPC         "powerpc"       /* Unhandled powerpc intr. */
  110 #define KDB_WHY_UNIONFS         "unionfs"       /* Unionfs bug. */
  111 #define KDB_WHY_DTRACE          "dtrace"        /* DTrace action entered debugger. */
  112 
  113 /* Return values for kdb_alt_break */
  114 #define KDB_REQ_DEBUGGER        1       /* User requested Debugger */
  115 #define KDB_REQ_PANIC           2       /* User requested a panic */
  116 #define KDB_REQ_REBOOT          3       /* User requested a clean reboot */
  117 
  118 #endif /* !_SYS_KDB_H_ */

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