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  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie the
   24  * rights to redistribute these changes.
   25  *
   26  * $FreeBSD: releng/5.0/sys/ddb/db_break.c 92756 2002-03-20 05:14:42Z alfred $
   27  */
   28 
   29 /*
   30  *      Author: David B. Golub, Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 /*
   34  * Breakpoints.
   35  */
   36 #include <sys/param.h>
   37 
   38 #include <vm/vm.h>
   39 #include <vm/vm_kern.h>
   40 
   41 #include <ddb/ddb.h>
   42 #include <ddb/db_break.h>
   43 #include <ddb/db_access.h>
   44 #include <ddb/db_sym.h>
   45 
   46 #define NBREAKPOINTS    100
   47 static struct db_breakpoint     db_break_table[NBREAKPOINTS];
   48 static db_breakpoint_t          db_next_free_breakpoint = &db_break_table[0];
   49 static db_breakpoint_t          db_free_breakpoints = 0;
   50 static db_breakpoint_t          db_breakpoint_list = 0;
   51 
   52 static db_breakpoint_t  db_breakpoint_alloc(void);
   53 static void     db_breakpoint_free(db_breakpoint_t bkpt);
   54 static void     db_delete_breakpoint(vm_map_t map, db_addr_t addr);
   55 static db_breakpoint_t  db_find_breakpoint(vm_map_t map, db_addr_t addr);
   56 static void     db_list_breakpoints(void);
   57 static void     db_set_breakpoint(vm_map_t map, db_addr_t addr, int count);
   58 
   59 static db_breakpoint_t
   60 db_breakpoint_alloc()
   61 {
   62         register db_breakpoint_t        bkpt;
   63 
   64         if ((bkpt = db_free_breakpoints) != 0) {
   65             db_free_breakpoints = bkpt->link;
   66             return (bkpt);
   67         }
   68         if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
   69             db_printf("All breakpoints used.\n");
   70             return (0);
   71         }
   72         bkpt = db_next_free_breakpoint;
   73         db_next_free_breakpoint++;
   74 
   75         return (bkpt);
   76 }
   77 
   78 static void
   79 db_breakpoint_free(bkpt)
   80         register db_breakpoint_t        bkpt;
   81 {
   82         bkpt->link = db_free_breakpoints;
   83         db_free_breakpoints = bkpt;
   84 }
   85 
   86 static void
   87 db_set_breakpoint(map, addr, count)
   88         vm_map_t        map;
   89         db_addr_t       addr;
   90         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(map, addr)
  117         vm_map_t        map;
  118         db_addr_t       addr;
  119 {
  120         register db_breakpoint_t        bkpt;
  121         register db_breakpoint_t        *prev;
  122 
  123         for (prev = &db_breakpoint_list;
  124              (bkpt = *prev) != 0;
  125              prev = &bkpt->link) {
  126             if (db_map_equal(bkpt->map, map) &&
  127                 (bkpt->address == addr)) {
  128                 *prev = bkpt->link;
  129                 break;
  130             }
  131         }
  132         if (bkpt == 0) {
  133             db_printf("Not set.\n");
  134             return;
  135         }
  136 
  137         db_breakpoint_free(bkpt);
  138 }
  139 
  140 static db_breakpoint_t
  141 db_find_breakpoint(map, addr)
  142         vm_map_t        map;
  143         db_addr_t       addr;
  144 {
  145         register db_breakpoint_t        bkpt;
  146 
  147         for (bkpt = db_breakpoint_list;
  148              bkpt != 0;
  149              bkpt = bkpt->link)
  150         {
  151             if (db_map_equal(bkpt->map, map) &&
  152                 (bkpt->address == addr))
  153                 return (bkpt);
  154         }
  155         return (0);
  156 }
  157 
  158 db_breakpoint_t
  159 db_find_breakpoint_here(addr)
  160         db_addr_t       addr;
  161 {
  162     return db_find_breakpoint(db_map_addr(addr), addr);
  163 }
  164 
  165 static boolean_t        db_breakpoints_inserted = TRUE;
  166 
  167 #ifndef BKPT_WRITE
  168 #define BKPT_WRITE(addr, storage)                               \
  169 do {                                                            \
  170         *storage = db_get_value(addr, BKPT_SIZE, FALSE);        \
  171         db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage));      \
  172 } while (0)
  173 #endif
  174 
  175 #ifndef BKPT_CLEAR
  176 #define BKPT_CLEAR(addr, storage) \
  177         db_put_value(addr, BKPT_SIZE, *storage)
  178 #endif
  179 
  180 void
  181 db_set_breakpoints()
  182 {
  183         register db_breakpoint_t        bkpt;
  184 
  185         if (!db_breakpoints_inserted) {
  186 
  187                 for (bkpt = db_breakpoint_list;
  188                      bkpt != 0;
  189                      bkpt = bkpt->link)
  190                         if (db_map_current(bkpt->map)) {
  191                                 BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  192                         }
  193                 db_breakpoints_inserted = TRUE;
  194         }
  195 }
  196 
  197 void
  198 db_clear_breakpoints()
  199 {
  200         register db_breakpoint_t        bkpt;
  201 
  202         if (db_breakpoints_inserted) {
  203 
  204                 for (bkpt = db_breakpoint_list;
  205                      bkpt != 0;
  206                      bkpt = bkpt->link)
  207                         if (db_map_current(bkpt->map)) {
  208                                 BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  209                         }
  210                 db_breakpoints_inserted = FALSE;
  211         }
  212 }
  213 
  214 #ifdef SOFTWARE_SSTEP
  215 /*
  216  * Set a temporary breakpoint.
  217  * The instruction is changed immediately,
  218  * so the breakpoint does not have to be on the breakpoint list.
  219  */
  220 db_breakpoint_t
  221 db_set_temp_breakpoint(addr)
  222         db_addr_t       addr;
  223 {
  224         register db_breakpoint_t        bkpt;
  225 
  226         bkpt = db_breakpoint_alloc();
  227         if (bkpt == 0) {
  228             db_printf("Too many breakpoints.\n");
  229             return 0;
  230         }
  231 
  232         bkpt->map = NULL;
  233         bkpt->address = addr;
  234         bkpt->flags = BKPT_TEMP;
  235         bkpt->init_count = 1;
  236         bkpt->count = 1;
  237 
  238         BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  239         return bkpt;
  240 }
  241 
  242 void
  243 db_delete_temp_breakpoint(bkpt)
  244         db_breakpoint_t bkpt;
  245 {
  246         BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  247         db_breakpoint_free(bkpt);
  248 }
  249 #endif /* SOFTWARE_SSTEP */
  250 
  251 /*
  252  * List breakpoints.
  253  */
  254 static void
  255 db_list_breakpoints()
  256 {
  257         register db_breakpoint_t        bkpt;
  258 
  259         if (db_breakpoint_list == 0) {
  260             db_printf("No breakpoints set\n");
  261             return;
  262         }
  263 
  264         db_printf(" Map      Count    Address\n");
  265         for (bkpt = db_breakpoint_list;
  266              bkpt != 0;
  267              bkpt = bkpt->link) {
  268             db_printf("%s%8p %5d    ",
  269                       db_map_current(bkpt->map) ? "*" : " ",
  270                       (void *)bkpt->map, bkpt->init_count);
  271             db_printsym(bkpt->address, DB_STGY_PROC);
  272             db_printf("\n");
  273         }
  274 }
  275 
  276 /* Delete breakpoint */
  277 /*ARGSUSED*/
  278 void
  279 db_delete_cmd(addr, have_addr, count, modif)
  280         db_expr_t       addr;
  281         boolean_t       have_addr;
  282         db_expr_t       count;
  283         char *          modif;
  284 {
  285         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  286 }
  287 
  288 /* Set breakpoint with skip count */
  289 /*ARGSUSED*/
  290 void
  291 db_breakpoint_cmd(addr, have_addr, count, modif)
  292         db_expr_t       addr;
  293         boolean_t       have_addr;
  294         db_expr_t       count;
  295         char *          modif;
  296 {
  297         if (count == -1)
  298             count = 1;
  299 
  300         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  301 }
  302 
  303 /* list breakpoints */
  304 void
  305 db_listbreak_cmd(dummy1, dummy2, dummy3, dummy4)
  306         db_expr_t       dummy1;
  307         boolean_t       dummy2;
  308         db_expr_t       dummy3;
  309         char *          dummy4;
  310 {
  311         db_list_breakpoints();
  312 }
  313 
  314 /*
  315  *      We want ddb to be usable before most of the kernel has been
  316  *      initialized.  In particular, current_thread() or kernel_map
  317  *      (or both) may be null.
  318  */
  319 
  320 boolean_t
  321 db_map_equal(map1, map2)
  322         vm_map_t        map1, map2;
  323 {
  324         return ((map1 == map2) ||
  325                 ((map1 == NULL) && (map2 == kernel_map)) ||
  326                 ((map1 == kernel_map) && (map2 == NULL)));
  327 }
  328 
  329 boolean_t
  330 db_map_current(map)
  331         vm_map_t        map;
  332 {
  333 #if 0
  334         thread_t        thread;
  335 
  336         return ((map == NULL) ||
  337                 (map == kernel_map) ||
  338                 (((thread = current_thread()) != NULL) &&
  339                  (map == thread->task->map)));
  340 #else
  341         return (1);
  342 #endif
  343 }
  344 
  345 vm_map_t
  346 db_map_addr(addr)
  347         vm_offset_t addr;
  348 {
  349 #if 0
  350         thread_t        thread;
  351 
  352         /*
  353          *      We want to return kernel_map for all
  354          *      non-user addresses, even when debugging
  355          *      kernel tasks with their own maps.
  356          */
  357 
  358         if ((VM_MIN_ADDRESS <= addr) &&
  359             (addr < VM_MAX_ADDRESS) &&
  360             ((thread = current_thread()) != NULL))
  361             return thread->task->map;
  362         else
  363 #endif
  364             return kernel_map;
  365 }
Cache object: 629738d3a6d6b4be3905566d803fa8a0
[ 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
