db_break.c

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    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  * $FreeBSD$
   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 __P((void));
   53 static void     db_breakpoint_free __P((db_breakpoint_t bkpt));
   54 static void     db_delete_breakpoint __P((vm_map_t map, db_addr_t addr));
   55 static db_breakpoint_t  db_find_breakpoint __P((vm_map_t map, db_addr_t addr));
   56 static void     db_list_breakpoints __P((void));
   57 static void     db_set_breakpoint __P((vm_map_t map, db_addr_t addr,
   58                                        int count));
   59 
   60 static db_breakpoint_t
   61 db_breakpoint_alloc()
   62 {
   63         register db_breakpoint_t        bkpt;
   64 
   65         if ((bkpt = db_free_breakpoints) != 0) {
   66             db_free_breakpoints = bkpt->link;
   67             return (bkpt);
   68         }
   69         if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
   70             db_printf("All breakpoints used.\n");
   71             return (0);
   72         }
   73         bkpt = db_next_free_breakpoint;
   74         db_next_free_breakpoint++;
   75 
   76         return (bkpt);
   77 }
   78 
   79 static void
   80 db_breakpoint_free(bkpt)
   81         register db_breakpoint_t        bkpt;
   82 {
   83         bkpt->link = db_free_breakpoints;
   84         db_free_breakpoints = bkpt;
   85 }
   86 
   87 static void
   88 db_set_breakpoint(map, addr, count)
   89         vm_map_t        map;
   90         db_addr_t       addr;
   91         int             count;
   92 {
   93         register db_breakpoint_t        bkpt;
   94 
   95         if (db_find_breakpoint(map, addr)) {
   96             db_printf("Already set.\n");
   97             return;
   98         }
   99 
  100         bkpt = db_breakpoint_alloc();
  101         if (bkpt == 0) {
  102             db_printf("Too many breakpoints.\n");
  103             return;
  104         }
  105 
  106         bkpt->map = map;
  107         bkpt->address = addr;
  108         bkpt->flags = 0;
  109         bkpt->init_count = count;
  110         bkpt->count = count;
  111 
  112         bkpt->link = db_breakpoint_list;
  113         db_breakpoint_list = bkpt;
  114 }
  115 
  116 static void
  117 db_delete_breakpoint(map, addr)
  118         vm_map_t        map;
  119         db_addr_t       addr;
  120 {
  121         register db_breakpoint_t        bkpt;
  122         register db_breakpoint_t        *prev;
  123 
  124         for (prev = &db_breakpoint_list;
  125              (bkpt = *prev) != 0;
  126              prev = &bkpt->link) {
  127             if (db_map_equal(bkpt->map, map) &&
  128                 (bkpt->address == addr)) {
  129                 *prev = bkpt->link;
  130                 break;
  131             }
  132         }
  133         if (bkpt == 0) {
  134             db_printf("Not set.\n");
  135             return;
  136         }
  137 
  138         db_breakpoint_free(bkpt);
  139 }
  140 
  141 static db_breakpoint_t
  142 db_find_breakpoint(map, addr)
  143         vm_map_t        map;
  144         db_addr_t       addr;
  145 {
  146         register db_breakpoint_t        bkpt;
  147 
  148         for (bkpt = db_breakpoint_list;
  149              bkpt != 0;
  150              bkpt = bkpt->link)
  151         {
  152             if (db_map_equal(bkpt->map, map) &&
  153                 (bkpt->address == addr))
  154                 return (bkpt);
  155         }
  156         return (0);
  157 }
  158 
  159 db_breakpoint_t
  160 db_find_breakpoint_here(addr)
  161         db_addr_t       addr;
  162 {
  163     return db_find_breakpoint(db_map_addr(addr), addr);
  164 }
  165 
  166 static boolean_t        db_breakpoints_inserted = TRUE;
  167 
  168 void
  169 db_set_breakpoints()
  170 {
  171         register db_breakpoint_t        bkpt;
  172 
  173         if (!db_breakpoints_inserted) {
  174 
  175             for (bkpt = db_breakpoint_list;
  176                  bkpt != 0;
  177                  bkpt = bkpt->link)
  178                 if (db_map_current(bkpt->map)) {
  179                     bkpt->bkpt_inst = db_get_value(bkpt->address,
  180                                                    BKPT_SIZE,
  181                                                    FALSE);
  182                     db_put_value(bkpt->address,
  183                                  BKPT_SIZE,
  184                                  BKPT_SET(bkpt->bkpt_inst));
  185                 }
  186             db_breakpoints_inserted = TRUE;
  187         }
  188 }
  189 
  190 void
  191 db_clear_breakpoints()
  192 {
  193         register db_breakpoint_t        bkpt;
  194 
  195         if (db_breakpoints_inserted) {
  196 
  197             for (bkpt = db_breakpoint_list;
  198                  bkpt != 0;
  199                  bkpt = bkpt->link)
  200                 if (db_map_current(bkpt->map)) {
  201                     db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
  202                 }
  203             db_breakpoints_inserted = FALSE;
  204         }
  205 }
  206 
  207 #ifdef SOFTWARE_SSTEP
  208 /*
  209  * Set a temporary breakpoint.
  210  * The instruction is changed immediately,
  211  * so the breakpoint does not have to be on the breakpoint list.
  212  */
  213 db_breakpoint_t
  214 db_set_temp_breakpoint(addr)
  215         db_addr_t       addr;
  216 {
  217         register db_breakpoint_t        bkpt;
  218 
  219         bkpt = db_breakpoint_alloc();
  220         if (bkpt == 0) {
  221             db_printf("Too many breakpoints.\n");
  222             return 0;
  223         }
  224 
  225         bkpt->map = NULL;
  226         bkpt->address = addr;
  227         bkpt->flags = BKPT_TEMP;
  228         bkpt->init_count = 1;
  229         bkpt->count = 1;
  230 
  231         bkpt->bkpt_inst = db_get_value(bkpt->address, BKPT_SIZE, FALSE);
  232         db_put_value(bkpt->address, BKPT_SIZE, BKPT_SET(bkpt->bkpt_inst));
  233         return bkpt;
  234 }
  235 
  236 void
  237 db_delete_temp_breakpoint(bkpt)
  238         db_breakpoint_t bkpt;
  239 {
  240         db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
  241         db_breakpoint_free(bkpt);
  242 }
  243 #endif /* SOFTWARE_SSTEP */
  244 
  245 /*
  246  * List breakpoints.
  247  */
  248 static void
  249 db_list_breakpoints()
  250 {
  251         register db_breakpoint_t        bkpt;
  252 
  253         if (db_breakpoint_list == 0) {
  254             db_printf("No breakpoints set\n");
  255             return;
  256         }
  257 
  258         db_printf(" Map      Count    Address\n");
  259         for (bkpt = db_breakpoint_list;
  260              bkpt != 0;
  261              bkpt = bkpt->link) {
  262             db_printf("%s%8p %5d    ",
  263                       db_map_current(bkpt->map) ? "*" : " ",
  264                       (void *)bkpt->map, bkpt->init_count);
  265             db_printsym(bkpt->address, DB_STGY_PROC);
  266             db_printf("\n");
  267         }
  268 }
  269 
  270 /* Delete breakpoint */
  271 /*ARGSUSED*/
  272 void
  273 db_delete_cmd(addr, have_addr, count, modif)
  274         db_expr_t       addr;
  275         boolean_t       have_addr;
  276         db_expr_t       count;
  277         char *          modif;
  278 {
  279         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  280 }
  281 
  282 /* Set breakpoint with skip count */
  283 /*ARGSUSED*/
  284 void
  285 db_breakpoint_cmd(addr, have_addr, count, modif)
  286         db_expr_t       addr;
  287         boolean_t       have_addr;
  288         db_expr_t       count;
  289         char *          modif;
  290 {
  291         if (count == -1)
  292             count = 1;
  293 
  294         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  295 }
  296 
  297 /* list breakpoints */
  298 void
  299 db_listbreak_cmd(dummy1, dummy2, dummy3, dummy4)
  300         db_expr_t       dummy1;
  301         boolean_t       dummy2;
  302         db_expr_t       dummy3;
  303         char *          dummy4;
  304 {
  305         db_list_breakpoints();
  306 }
  307 
  308 /*
  309  *      We want ddb to be usable before most of the kernel has been
  310  *      initialized.  In particular, current_thread() or kernel_map
  311  *      (or both) may be null.
  312  */
  313 
  314 boolean_t
  315 db_map_equal(map1, map2)
  316         vm_map_t        map1, map2;
  317 {
  318         return ((map1 == map2) ||
  319                 ((map1 == NULL) && (map2 == kernel_map)) ||
  320                 ((map1 == kernel_map) && (map2 == NULL)));
  321 }
  322 
  323 boolean_t
  324 db_map_current(map)
  325         vm_map_t        map;
  326 {
  327 #if 0
  328         thread_t        thread;
  329 
  330         return ((map == NULL) ||
  331                 (map == kernel_map) ||
  332                 (((thread = current_thread()) != NULL) &&
  333                  (map == thread->task->map)));
  334 #else
  335         return (1);
  336 #endif
  337 }
  338 
  339 vm_map_t
  340 db_map_addr(addr)
  341         vm_offset_t addr;
  342 {
  343 #if 0
  344         thread_t        thread;
  345 
  346         /*
  347          *      We want to return kernel_map for all
  348          *      non-user addresses, even when debugging
  349          *      kernel tasks with their own maps.
  350          */
  351 
  352         if ((VM_MIN_ADDRESS <= addr) &&
  353             (addr < VM_MAX_ADDRESS) &&
  354             ((thread = current_thread()) != NULL))
  355             return thread->task->map;
  356         else
  357 #endif
  358             return kernel_map;
  359 }
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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_break.c

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