db_break.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * SPDX-License-Identifier: MIT-CMU
    3  *
    4  * Mach Operating System
    5  * Copyright (c) 1991,1990 Carnegie Mellon University
    6  * All Rights Reserved.
    7  *
    8  * Permission to use, copy, modify and distribute this software and its
    9  * documentation is hereby granted, provided that both the copyright
   10  * notice and this permission notice appear in all copies of the
   11  * software, derivative works or modified versions, and any portions
   12  * thereof, and that both notices appear in supporting documentation.
   13  *
   14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   17  *
   18  * Carnegie Mellon requests users of this software to return to
   19  *
   20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   21  *  School of Computer Science
   22  *  Carnegie Mellon University
   23  *  Pittsburgh PA 15213-3890
   24  *
   25  * any improvements or extensions that they make and grant Carnegie the
   26  * rights to redistribute these changes.
   27  *
   28  */
   29 /*
   30  *      Author: David B. Golub, Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 /*
   34  * Breakpoints.
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include <sys/param.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/vm_kern.h>
   44 
   45 #include <ddb/ddb.h>
   46 #include <ddb/db_break.h>
   47 #include <ddb/db_access.h>
   48 #include <ddb/db_sym.h>
   49 
   50 #define NBREAKPOINTS    100
   51 static struct db_breakpoint     db_break_table[NBREAKPOINTS];
   52 static db_breakpoint_t          db_next_free_breakpoint = &db_break_table[0];
   53 static db_breakpoint_t          db_free_breakpoints = 0;
   54 static db_breakpoint_t          db_breakpoint_list = 0;
   55 
   56 static db_breakpoint_t  db_breakpoint_alloc(void);
   57 static void     db_breakpoint_free(db_breakpoint_t bkpt);
   58 static void     db_delete_breakpoint(vm_map_t map, db_addr_t addr);
   59 static db_breakpoint_t  db_find_breakpoint(vm_map_t map, db_addr_t addr);
   60 static void     db_list_breakpoints(void);
   61 static void     db_set_breakpoint(vm_map_t map, db_addr_t addr, int count);
   62 
   63 static db_breakpoint_t
   64 db_breakpoint_alloc(void)
   65 {
   66         register db_breakpoint_t        bkpt;
   67 
   68         if ((bkpt = db_free_breakpoints) != 0) {
   69             db_free_breakpoints = bkpt->link;
   70             return (bkpt);
   71         }
   72         if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
   73             db_printf("All breakpoints used.\n");
   74             return (0);
   75         }
   76         bkpt = db_next_free_breakpoint;
   77         db_next_free_breakpoint++;
   78 
   79         return (bkpt);
   80 }
   81 
   82 static void
   83 db_breakpoint_free(db_breakpoint_t bkpt)
   84 {
   85         bkpt->link = db_free_breakpoints;
   86         db_free_breakpoints = bkpt;
   87 }
   88 
   89 static void
   90 db_set_breakpoint(vm_map_t map, db_addr_t addr, int count)
   91 {
   92         register db_breakpoint_t        bkpt;
   93 
   94         if (db_find_breakpoint(map, addr)) {
   95             db_printf("Already set.\n");
   96             return;
   97         }
   98 
   99         bkpt = db_breakpoint_alloc();
  100         if (bkpt == 0) {
  101             db_printf("Too many breakpoints.\n");
  102             return;
  103         }
  104 
  105         bkpt->map = map;
  106         bkpt->address = addr;
  107         bkpt->flags = 0;
  108         bkpt->init_count = count;
  109         bkpt->count = count;
  110 
  111         bkpt->link = db_breakpoint_list;
  112         db_breakpoint_list = bkpt;
  113 }
  114 
  115 static void
  116 db_delete_breakpoint(vm_map_t map, db_addr_t addr)
  117 {
  118         register db_breakpoint_t        bkpt;
  119         register db_breakpoint_t        *prev;
  120 
  121         for (prev = &db_breakpoint_list;
  122              (bkpt = *prev) != 0;
  123              prev = &bkpt->link) {
  124             if (db_map_equal(bkpt->map, map) &&
  125                 (bkpt->address == addr)) {
  126                 *prev = bkpt->link;
  127                 break;
  128             }
  129         }
  130         if (bkpt == 0) {
  131             db_printf("Not set.\n");
  132             return;
  133         }
  134 
  135         db_breakpoint_free(bkpt);
  136 }
  137 
  138 static db_breakpoint_t
  139 db_find_breakpoint(vm_map_t map, db_addr_t addr)
  140 {
  141         register db_breakpoint_t        bkpt;
  142 
  143         for (bkpt = db_breakpoint_list;
  144              bkpt != 0;
  145              bkpt = bkpt->link)
  146         {
  147             if (db_map_equal(bkpt->map, map) &&
  148                 (bkpt->address == addr))
  149                 return (bkpt);
  150         }
  151         return (0);
  152 }
  153 
  154 db_breakpoint_t
  155 db_find_breakpoint_here(db_addr_t addr)
  156 {
  157         return db_find_breakpoint(db_map_addr(addr), addr);
  158 }
  159 
  160 static bool     db_breakpoints_inserted = true;
  161 
  162 #ifndef BKPT_WRITE
  163 #define BKPT_WRITE(addr, storage)                               \
  164 do {                                                            \
  165         *storage = db_get_value(addr, BKPT_SIZE, false);        \
  166         db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage));      \
  167 } while (0)
  168 #endif
  169 
  170 #ifndef BKPT_CLEAR
  171 #define BKPT_CLEAR(addr, storage) \
  172         db_put_value(addr, BKPT_SIZE, *storage)
  173 #endif
  174 
  175 void
  176 db_set_breakpoints(void)
  177 {
  178         register db_breakpoint_t        bkpt;
  179 
  180         if (!db_breakpoints_inserted) {
  181                 for (bkpt = db_breakpoint_list;
  182                      bkpt != 0;
  183                      bkpt = bkpt->link)
  184                         if (db_map_current(bkpt->map)) {
  185                                 BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  186                         }
  187                 db_breakpoints_inserted = true;
  188         }
  189 }
  190 
  191 void
  192 db_clear_breakpoints(void)
  193 {
  194         register db_breakpoint_t        bkpt;
  195 
  196         if (db_breakpoints_inserted) {
  197                 for (bkpt = db_breakpoint_list;
  198                      bkpt != 0;
  199                      bkpt = bkpt->link)
  200                         if (db_map_current(bkpt->map)) {
  201                                 BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  202                         }
  203                 db_breakpoints_inserted = false;
  204         }
  205 }
  206 
  207 /*
  208  * List breakpoints.
  209  */
  210 static void
  211 db_list_breakpoints(void)
  212 {
  213         register db_breakpoint_t        bkpt;
  214 
  215         if (db_breakpoint_list == 0) {
  216             db_printf("No breakpoints set\n");
  217             return;
  218         }
  219 
  220         db_printf(" Map      Count    Address\n");
  221         for (bkpt = db_breakpoint_list;
  222              bkpt != 0;
  223              bkpt = bkpt->link) {
  224             db_printf("%s%8p %5d    ",
  225                       db_map_current(bkpt->map) ? "*" : " ",
  226                       (void *)bkpt->map, bkpt->init_count);
  227             db_printsym(bkpt->address, DB_STGY_PROC);
  228             db_printf("\n");
  229         }
  230 }
  231 
  232 /* Delete breakpoint */
  233 /*ARGSUSED*/
  234 void
  235 db_delete_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
  236 {
  237         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  238 }
  239 
  240 /* Set breakpoint with skip count */
  241 /*ARGSUSED*/
  242 void
  243 db_breakpoint_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
  244 {
  245         if (count == -1)
  246             count = 1;
  247 
  248         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  249 }
  250 
  251 /* list breakpoints */
  252 void
  253 db_listbreak_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
  254 {
  255         db_list_breakpoints();
  256 }
  257 
  258 /*
  259  *      We want ddb to be usable before most of the kernel has been
  260  *      initialized.  In particular, current_thread() or kernel_map
  261  *      (or both) may be null.
  262  */
  263 
  264 bool
  265 db_map_equal(vm_map_t map1, vm_map_t map2)
  266 {
  267         return ((map1 == map2) ||
  268                 ((map1 == NULL) && (map2 == kernel_map)) ||
  269                 ((map1 == kernel_map) && (map2 == NULL)));
  270 }
  271 
  272 bool
  273 db_map_current(vm_map_t map)
  274 {
  275 #if 0
  276         thread_t        thread;
  277 
  278         return ((map == NULL) ||
  279                 (map == kernel_map) ||
  280                 (((thread = current_thread()) != NULL) &&
  281                  (map == thread->task->map)));
  282 #else
  283         return (true);
  284 #endif
  285 }
  286 
  287 vm_map_t
  288 db_map_addr(vm_offset_t addr)
  289 {
  290 #if 0
  291         thread_t        thread;
  292 
  293         /*
  294          *      We want to return kernel_map for all
  295          *      non-user addresses, even when debugging
  296          *      kernel tasks with their own maps.
  297          */
  298 
  299         if ((VM_MIN_ADDRESS <= addr) &&
  300             (addr < VM_MAX_ADDRESS) &&
  301             ((thread = current_thread()) != NULL))
  302             return thread->task->map;
  303         else
  304 #endif
  305             return kernel_map;
  306 }

Cache object: faef9118f3b577a5b59a4528e64b1041

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/ddb/db_break.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_break.c