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: src/sys/ddb/db_break.c,v 1.11.4.1 1999/09/05 08:08:42 peter Exp $
   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 #include <sys/systm.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/vm_kern.h>
   41 
   42 #include <ddb/ddb.h>
   43 #include <ddb/db_lex.h>
   44 #include <ddb/db_break.h>
   45 #include <ddb/db_access.h>
   46 #include <ddb/db_sym.h>
   47 
   48 #define NBREAKPOINTS    100
   49 static struct db_breakpoint     db_break_table[NBREAKPOINTS];
   50 static db_breakpoint_t          db_next_free_breakpoint = &db_break_table[0];
   51 static db_breakpoint_t          db_free_breakpoints = 0;
   52 static db_breakpoint_t          db_breakpoint_list = 0;
   53 
   54 static db_breakpoint_t  db_breakpoint_alloc __P((void));
   55 static void     db_breakpoint_free __P((db_breakpoint_t bkpt));
   56 static void     db_delete_breakpoint __P((vm_map_t map, db_addr_t addr));
   57 static db_breakpoint_t  db_find_breakpoint __P((vm_map_t map, db_addr_t addr));
   58 static void     db_list_breakpoints __P((void));
   59 static void     db_set_breakpoint __P((vm_map_t map, db_addr_t addr,
   60                                        int count));
   61 #ifdef notused
   62 static db_breakpoint_t  db_set_temp_breakpoint __P((db_addr_t addr));
   63 static void     db_delete_temp_breakpoint __P((db_breakpoint_t bkpt));
   64 #endif
   65 
   66 static db_breakpoint_t
   67 db_breakpoint_alloc()
   68 {
   69         register db_breakpoint_t        bkpt;
   70 
   71         if ((bkpt = db_free_breakpoints) != 0) {
   72             db_free_breakpoints = bkpt->link;
   73             return (bkpt);
   74         }
   75         if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
   76             db_printf("All breakpoints used.\n");
   77             return (0);
   78         }
   79         bkpt = db_next_free_breakpoint;
   80         db_next_free_breakpoint++;
   81 
   82         return (bkpt);
   83 }
   84 
   85 static void
   86 db_breakpoint_free(bkpt)
   87         register db_breakpoint_t        bkpt;
   88 {
   89         bkpt->link = db_free_breakpoints;
   90         db_free_breakpoints = bkpt;
   91 }
   92 
   93 static void
   94 db_set_breakpoint(map, addr, count)
   95         vm_map_t        map;
   96         db_addr_t       addr;
   97         int             count;
   98 {
   99         register db_breakpoint_t        bkpt;
  100 
  101         if (db_find_breakpoint(map, addr)) {
  102             db_printf("Already set.\n");
  103             return;
  104         }
  105 
  106         bkpt = db_breakpoint_alloc();
  107         if (bkpt == 0) {
  108             db_printf("Too many breakpoints.\n");
  109             return;
  110         }
  111 
  112         bkpt->map = map;
  113         bkpt->address = addr;
  114         bkpt->flags = 0;
  115         bkpt->init_count = count;
  116         bkpt->count = count;
  117 
  118         bkpt->link = db_breakpoint_list;
  119         db_breakpoint_list = bkpt;
  120 }
  121 
  122 static void
  123 db_delete_breakpoint(map, addr)
  124         vm_map_t        map;
  125         db_addr_t       addr;
  126 {
  127         register db_breakpoint_t        bkpt;
  128         register db_breakpoint_t        *prev;
  129 
  130         for (prev = &db_breakpoint_list;
  131              (bkpt = *prev) != 0;
  132              prev = &bkpt->link) {
  133             if (db_map_equal(bkpt->map, map) &&
  134                 (bkpt->address == addr)) {
  135                 *prev = bkpt->link;
  136                 break;
  137             }
  138         }
  139         if (bkpt == 0) {
  140             db_printf("Not set.\n");
  141             return;
  142         }
  143 
  144         db_breakpoint_free(bkpt);
  145 }
  146 
  147 static db_breakpoint_t
  148 db_find_breakpoint(map, addr)
  149         vm_map_t        map;
  150         db_addr_t       addr;
  151 {
  152         register db_breakpoint_t        bkpt;
  153 
  154         for (bkpt = db_breakpoint_list;
  155              bkpt != 0;
  156              bkpt = bkpt->link)
  157         {
  158             if (db_map_equal(bkpt->map, map) &&
  159                 (bkpt->address == addr))
  160                 return (bkpt);
  161         }
  162         return (0);
  163 }
  164 
  165 db_breakpoint_t
  166 db_find_breakpoint_here(addr)
  167         db_addr_t       addr;
  168 {
  169     return db_find_breakpoint(db_map_addr(addr), addr);
  170 }
  171 
  172 static boolean_t        db_breakpoints_inserted = TRUE;
  173 
  174 void
  175 db_set_breakpoints()
  176 {
  177         register db_breakpoint_t        bkpt;
  178 
  179         if (!db_breakpoints_inserted) {
  180 
  181             for (bkpt = db_breakpoint_list;
  182                  bkpt != 0;
  183                  bkpt = bkpt->link)
  184                 if (db_map_current(bkpt->map)) {
  185                     bkpt->bkpt_inst = db_get_value(bkpt->address,
  186                                                    BKPT_SIZE,
  187                                                    FALSE);
  188                     db_put_value(bkpt->address,
  189                                  BKPT_SIZE,
  190                                  BKPT_SET(bkpt->bkpt_inst));
  191                 }
  192             db_breakpoints_inserted = TRUE;
  193         }
  194 }
  195 
  196 void
  197 db_clear_breakpoints()
  198 {
  199         register db_breakpoint_t        bkpt;
  200 
  201         if (db_breakpoints_inserted) {
  202 
  203             for (bkpt = db_breakpoint_list;
  204                  bkpt != 0;
  205                  bkpt = bkpt->link)
  206                 if (db_map_current(bkpt->map)) {
  207                     db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
  208                 }
  209             db_breakpoints_inserted = FALSE;
  210         }
  211 }
  212 
  213 #ifdef notused
  214 /*
  215  * Set a temporary breakpoint.
  216  * The instruction is changed immediately,
  217  * so the breakpoint does not have to be on the breakpoint list.
  218  */
  219 static db_breakpoint_t
  220 db_set_temp_breakpoint(addr)
  221         db_addr_t       addr;
  222 {
  223         register db_breakpoint_t        bkpt;
  224 
  225         bkpt = db_breakpoint_alloc();
  226         if (bkpt == 0) {
  227             db_printf("Too many breakpoints.\n");
  228             return 0;
  229         }
  230 
  231         bkpt->map = NULL;
  232         bkpt->address = addr;
  233         bkpt->flags = BKPT_TEMP;
  234         bkpt->init_count = 1;
  235         bkpt->count = 1;
  236 
  237         bkpt->bkpt_inst = db_get_value(bkpt->address, BKPT_SIZE, FALSE);
  238         db_put_value(bkpt->address, BKPT_SIZE, BKPT_SET(bkpt->bkpt_inst));
  239         return bkpt;
  240 }
  241 
  242 static void
  243 db_delete_temp_breakpoint(bkpt)
  244         db_breakpoint_t bkpt;
  245 {
  246         db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
  247         db_breakpoint_free(bkpt);
  248 }
  249 #endif
  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         {
  269             db_printf("%s%8x %5d    ",
  270                       db_map_current(bkpt->map) ? "*" : " ",
  271                       bkpt->map, bkpt->init_count);
  272             db_printsym(bkpt->address, DB_STGY_PROC);
  273             db_printf("\n");
  274         }
  275 }
  276 
  277 /* Delete breakpoint */
  278 /*ARGSUSED*/
  279 void
  280 db_delete_cmd(addr, have_addr, count, modif)
  281         db_expr_t       addr;
  282         boolean_t       have_addr;
  283         db_expr_t       count;
  284         char *          modif;
  285 {
  286         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  287 }
  288 
  289 /* Set breakpoint with skip count */
  290 /*ARGSUSED*/
  291 void
  292 db_breakpoint_cmd(addr, have_addr, count, modif)
  293         db_expr_t       addr;
  294         boolean_t       have_addr;
  295         db_expr_t       count;
  296         char *          modif;
  297 {
  298         if (count == -1)
  299             count = 1;
  300 
  301         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  302 }
  303 
  304 /* list breakpoints */
  305 void
  306 db_listbreak_cmd(dummy1, dummy2, dummy3, dummy4)
  307         db_expr_t       dummy1;
  308         boolean_t       dummy2;
  309         db_expr_t       dummy3;
  310         char *          dummy4;
  311 {
  312         db_list_breakpoints();
  313 }
  314 
  315 /*
  316  *      We want ddb to be usable before most of the kernel has been
  317  *      initialized.  In particular, current_thread() or kernel_map
  318  *      (or both) may be null.
  319  */
  320 
  321 boolean_t
  322 db_map_equal(map1, map2)
  323         vm_map_t        map1, map2;
  324 {
  325         return ((map1 == map2) ||
  326                 ((map1 == NULL) && (map2 == kernel_map)) ||
  327                 ((map1 == kernel_map) && (map2 == NULL)));
  328 }
  329 
  330 boolean_t
  331 db_map_current(map)
  332         vm_map_t        map;
  333 {
  334 #if 0
  335         thread_t        thread;
  336 
  337         return ((map == NULL) ||
  338                 (map == kernel_map) ||
  339                 (((thread = current_thread()) != NULL) &&
  340                  (map == thread->task->map)));
  341 #else
  342         return (1);
  343 #endif
  344 }
  345 
  346 vm_map_t
  347 db_map_addr(addr)
  348         vm_offset_t addr;
  349 {
  350 #if 0
  351         thread_t        thread;
  352 
  353         /*
  354          *      We want to return kernel_map for all
  355          *      non-user addresses, even when debugging
  356          *      kernel tasks with their own maps.
  357          */
  358 
  359         if ((VM_MIN_ADDRESS <= addr) &&
  360             (addr < VM_MAX_ADDRESS) &&
  361             ((thread = current_thread()) != NULL))
  362             return thread->task->map;
  363         else
  364 #endif
  365             return kernel_map;
  366 }
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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_break.c

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