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/ddb/ddb.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1993, Garrett A. Wollman.
    5  * Copyright (c) 1993, University of Vermont and State Agricultural College.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   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  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD$
   33  */
   34 
   35 /*
   36  * Necessary declarations for the `ddb' kernel debugger.
   37  */
   38 
   39 #ifndef _DDB_DDB_H_
   40 #define _DDB_DDB_H_
   41 
   42 #ifdef SYSCTL_DECL
   43 SYSCTL_DECL(_debug_ddb);
   44 #endif
   45 
   46 #include <machine/db_machdep.h>         /* type definitions */
   47 
   48 #include <sys/queue.h>                  /* LIST_* */
   49 #include <sys/kernel.h>                 /* SYSINIT */
   50 
   51 #ifndef DB_MAXARGS
   52 #define DB_MAXARGS      10
   53 #endif
   54 
   55 #ifndef DB_MAXLINE
   56 #define DB_MAXLINE      120
   57 #endif
   58 
   59 #ifndef DB_MAXSCRIPTS
   60 #define DB_MAXSCRIPTS   8
   61 #endif
   62 
   63 #ifndef DB_MAXSCRIPTNAME
   64 #define DB_MAXSCRIPTNAME        32
   65 #endif
   66 
   67 #ifndef DB_MAXSCRIPTLEN
   68 #define DB_MAXSCRIPTLEN 128
   69 #endif
   70 
   71 #ifndef DB_MAXSCRIPTRECURSION
   72 #define DB_MAXSCRIPTRECURSION   3
   73 #endif
   74 
   75 #ifndef DB_STOFFS
   76 #define DB_STOFFS(offs)         (offs)
   77 #endif
   78 
   79 #ifndef DB_CALL
   80 #define DB_CALL db_fncall_generic
   81 #else
   82 int     DB_CALL(db_expr_t, db_expr_t *, int, db_expr_t[]);
   83 #endif
   84 
   85 /*
   86  * Extern variables to set the address and size of the symtab and strtab.
   87  * Most users should use db_fetch_symtab in order to set them from the
   88  * boot loader provided values.
   89  */
   90 extern vm_offset_t ksymtab, kstrtab, ksymtab_size;
   91 
   92 /*
   93  * There are three "command tables":
   94  * - One for simple commands; a list of these is displayed
   95  *   by typing 'help' at the debugger prompt.
   96  * - One for sub-commands of 'show'; to see this type 'show'
   97  *   without any arguments.
   98  * - The last one for sub-commands of 'show all'; type 'show all'
   99  *   without any argument to get a list.
  100  */
  101 struct command;
  102 LIST_HEAD(command_table, command);
  103 extern struct command_table db_cmd_table;
  104 extern struct command_table db_show_table;
  105 extern struct command_table db_show_all_table;
  106 
  107 /*
  108  * Type signature for a function implementing a ddb command.
  109  */
  110 typedef void db_cmdfcn_t(db_expr_t addr, bool have_addr, db_expr_t count,
  111             char *modif);
  112 
  113 /*
  114  * Command table entry.
  115  */
  116 struct command {
  117         char *  name;           /* command name */
  118         db_cmdfcn_t *fcn;       /* function to call */
  119         int     flag;           /* extra info: */
  120 #define CS_OWN          0x1     /* non-standard syntax */
  121 #define CS_MORE         0x2     /* standard syntax, but may have other words
  122                                  * at end */
  123 #define CS_SET_DOT      0x100   /* set dot after command */
  124         struct command_table *more; /* another level of command */
  125         LIST_ENTRY(command) next; /* next entry in the command table */
  126 };
  127 
  128 /*
  129  * Arrange for the specified ddb command to be defined and
  130  * bound to the specified function.  Commands can be defined
  131  * in modules in which case they will be available only when
  132  * the module is loaded.
  133  */
  134 #define _DB_SET(_suffix, _name, _func, list, _flag, _more)      \
  135 static struct command __CONCAT(_name,_suffix) = {               \
  136         .name   = __STRING(_name),                              \
  137         .fcn    = _func,                                        \
  138         .flag   = _flag,                                        \
  139         .more   = _more                                         \
  140 };                                                              \
  141 static void __CONCAT(__CONCAT(_name,_suffix),_add)(void *arg __unused) \
  142     { db_command_register(&list, &__CONCAT(_name,_suffix)); }   \
  143 SYSINIT(__CONCAT(_name,_suffix), SI_SUB_KLD, SI_ORDER_ANY,      \
  144     __CONCAT(__CONCAT(_name,_suffix),_add), NULL);              \
  145 static void __CONCAT(__CONCAT(_name,_suffix),_del)(void *arg __unused) \
  146     { db_command_unregister(&list, &__CONCAT(_name,_suffix)); } \
  147 SYSUNINIT(__CONCAT(_name,_suffix), SI_SUB_KLD, SI_ORDER_ANY,    \
  148     __CONCAT(__CONCAT(_name,_suffix),_del), NULL);
  149 
  150 /*
  151  * Like _DB_SET but also create the function declaration which
  152  * must be followed immediately by the body; e.g.
  153  *   _DB_FUNC(_cmd, panic, db_panic, db_cmd_table, 0, NULL)
  154  *   {
  155  *      ...panic implementation...
  156  *   }
  157  *
  158  * This macro is mostly used to define commands placed in one of
  159  * the ddb command tables; see DB_COMMAND, etc. below.
  160  */
  161 #define _DB_FUNC(_suffix, _name, _func, list, _flag, _more)     \
  162 static db_cmdfcn_t _func;                                       \
  163 _DB_SET(_suffix, _name, _func, list, _flag, _more);             \
  164 static void                                                     \
  165 _func(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
  166 
  167 /* common idom provided for backwards compatibility */
  168 #define DB_FUNC(_name, _func, list, _flag, _more)               \
  169         _DB_FUNC(_cmd, _name, _func, list, _flag, _more)
  170 
  171 #define DB_COMMAND(cmd_name, func_name) \
  172         _DB_FUNC(_cmd, cmd_name, func_name, db_cmd_table, 0, NULL)
  173 #define DB_ALIAS(alias_name, func_name) \
  174         _DB_SET(_cmd, alias_name, func_name, db_cmd_table, 0, NULL)
  175 #define DB_SHOW_COMMAND(cmd_name, func_name) \
  176         _DB_FUNC(_show, cmd_name, func_name, db_show_table, 0, NULL)
  177 #define DB_SHOW_ALIAS(alias_name, func_name) \
  178         _DB_SET(_show, alias_name, func_name, db_show_table, 0, NULL)
  179 #define DB_SHOW_ALL_COMMAND(cmd_name, func_name) \
  180         _DB_FUNC(_show_all, cmd_name, func_name, db_show_all_table, 0, NULL)
  181 #define DB_SHOW_ALL_ALIAS(alias_name, func_name) \
  182         _DB_SET(_show_all, alias_name, func_name, db_show_all_table, 0, NULL)
  183 
  184 extern db_expr_t db_maxoff;
  185 extern int db_indent;
  186 extern int db_inst_count;
  187 extern int db_load_count;
  188 extern int db_store_count;
  189 extern volatile int db_pager_quit;
  190 extern db_expr_t db_radix;
  191 extern db_expr_t db_max_width;
  192 extern db_expr_t db_tab_stop_width;
  193 extern db_expr_t db_lines_per_page;
  194 
  195 struct thread;
  196 struct vm_map;
  197 
  198 void            db_check_interrupt(void);
  199 void            db_clear_watchpoints(void);
  200 db_addr_t       db_disasm(db_addr_t loc, bool altfmt);
  201                                 /* instruction disassembler */
  202 void            db_error(const char *s);
  203 int             db_expression(db_expr_t *valuep);
  204 int             db_get_variable(db_expr_t *valuep);
  205 void            db_iprintf(const char *,...) __printflike(1, 2);
  206 struct proc     *db_lookup_proc(db_expr_t addr);
  207 struct thread   *db_lookup_thread(db_expr_t addr, bool check_pid);
  208 struct vm_map   *db_map_addr(vm_offset_t);
  209 bool            db_map_current(struct vm_map *);
  210 bool            db_map_equal(struct vm_map *, struct vm_map *);
  211 int             db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
  212 int             db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
  213 void            db_md_list_watchpoints(void);
  214 void            db_print_loc_and_inst(db_addr_t loc);
  215 void            db_print_thread(void);
  216 int             db_printf(const char *fmt, ...) __printflike(1, 2);
  217 int             db_read_bytes(vm_offset_t addr, size_t size, char *data);
  218                                 /* machine-dependent */
  219 int             db_readline(char *lstart, int lsize);
  220 void            db_restart_at_pc(bool watchpt);
  221 int             db_set_variable(db_expr_t value);
  222 void            db_set_watchpoints(void);
  223 void            db_skip_to_eol(void);
  224 bool            db_stop_at_pc(int type, int code, bool *is_breakpoint,
  225                     bool *is_watchpoint);
  226 #define         db_strcpy       strcpy
  227 void            db_trace_self(void);
  228 int             db_trace_thread(struct thread *, int);
  229 bool            db_value_of_name(const char *name, db_expr_t *valuep);
  230 bool            db_value_of_name_pcpu(const char *name, db_expr_t *valuep);
  231 bool            db_value_of_name_vnet(const char *name, db_expr_t *valuep);
  232 int             db_write_bytes(vm_offset_t addr, size_t size, char *data);
  233 void            db_command_register(struct command_table *, struct command *);
  234 void            db_command_unregister(struct command_table *, struct command *);
  235 int             db_fetch_ksymtab(vm_offset_t ksym_start, vm_offset_t ksym_end);
  236 
  237 db_cmdfcn_t     db_breakpoint_cmd;
  238 db_cmdfcn_t     db_capture_cmd;
  239 db_cmdfcn_t     db_continue_cmd;
  240 db_cmdfcn_t     db_delete_cmd;
  241 db_cmdfcn_t     db_deletehwatch_cmd;
  242 db_cmdfcn_t     db_deletewatch_cmd;
  243 db_cmdfcn_t     db_examine_cmd;
  244 db_cmdfcn_t     db_findstack_cmd;
  245 db_cmdfcn_t     db_hwatchpoint_cmd;
  246 db_cmdfcn_t     db_listbreak_cmd;
  247 db_cmdfcn_t     db_scripts_cmd;
  248 db_cmdfcn_t     db_print_cmd;
  249 db_cmdfcn_t     db_ps;
  250 db_cmdfcn_t     db_run_cmd;
  251 db_cmdfcn_t     db_script_cmd;
  252 db_cmdfcn_t     db_search_cmd;
  253 db_cmdfcn_t     db_set_cmd;
  254 db_cmdfcn_t     db_set_thread;
  255 db_cmdfcn_t     db_show_regs;
  256 db_cmdfcn_t     db_show_threads;
  257 db_cmdfcn_t     db_single_step_cmd;
  258 db_cmdfcn_t     db_textdump_cmd;
  259 db_cmdfcn_t     db_trace_until_call_cmd;
  260 db_cmdfcn_t     db_trace_until_matching_cmd;
  261 db_cmdfcn_t     db_unscript_cmd;
  262 db_cmdfcn_t     db_watchpoint_cmd;
  263 db_cmdfcn_t     db_write_cmd;
  264 
  265 /*
  266  * Interface between DDB and the DDB output capture facility.
  267  */
  268 struct dumperinfo;
  269 void    db_capture_dump(struct dumperinfo *di);
  270 void    db_capture_enterpager(void);
  271 void    db_capture_exitpager(void);
  272 void    db_capture_write(char *buffer, u_int buflen);
  273 void    db_capture_writech(char ch);
  274 
  275 /*
  276  * Interface between DDB  and the script facility.
  277  */
  278 void    db_script_kdbenter(const char *eventname);      /* KDB enter event. */
  279 
  280 /*
  281  * Interface between DDB and the textdump facility.
  282  *
  283  * Text dump blocks are of a fixed size; textdump_block_buffer is a
  284  * statically allocated buffer that code interacting with textdumps can use
  285  * to prepare and hold a pending block in when calling writenextblock().
  286  */
  287 #define TEXTDUMP_BLOCKSIZE      512
  288 extern char     textdump_block_buffer[TEXTDUMP_BLOCKSIZE];
  289 
  290 void    textdump_mkustar(char *block_buffer, const char *filename,
  291             u_int size);
  292 void    textdump_restoreoff(off_t offset);
  293 void    textdump_saveoff(off_t *offsetp);
  294 int     textdump_writenextblock(struct dumperinfo *di, char *buffer);
  295 
  296 /*
  297  * Interface between the kernel and textdumps.
  298  */
  299 extern int      textdump_pending;       /* Call textdump_dumpsys() instead. */
  300 void    textdump_dumpsys(struct dumperinfo *di);
  301 
  302 #endif /* !_DDB_DDB_H_ */

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