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  */
   27 /*
   28  *      Author: David B. Golub, Carnegie Mellon University
   29  *      Date:   7/90
   30  */
   31 /*
   32  * Breakpoints.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/9.2/sys/ddb/db_break.c 225214 2011-08-27 14:24:27Z rwatson $");
   37 
   38 #include <sys/param.h>
   39 
   40 #include <vm/vm.h>
   41 #include <vm/vm_kern.h>
   42 
   43 #include <ddb/ddb.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(void);
   55 static void     db_breakpoint_free(db_breakpoint_t bkpt);
   56 static void     db_delete_breakpoint(vm_map_t map, db_addr_t addr);
   57 static db_breakpoint_t  db_find_breakpoint(vm_map_t map, db_addr_t addr);
   58 static void     db_list_breakpoints(void);
   59 static void     db_set_breakpoint(vm_map_t map, db_addr_t addr, int count);
   60 
   61 static db_breakpoint_t
   62 db_breakpoint_alloc()
   63 {
   64         register db_breakpoint_t        bkpt;
   65 
   66         if ((bkpt = db_free_breakpoints) != 0) {
   67             db_free_breakpoints = bkpt->link;
   68             return (bkpt);
   69         }
   70         if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
   71             db_printf("All breakpoints used.\n");
   72             return (0);
   73         }
   74         bkpt = db_next_free_breakpoint;
   75         db_next_free_breakpoint++;
   76 
   77         return (bkpt);
   78 }
   79 
   80 static void
   81 db_breakpoint_free(bkpt)
   82         register db_breakpoint_t        bkpt;
   83 {
   84         bkpt->link = db_free_breakpoints;
   85         db_free_breakpoints = bkpt;
   86 }
   87 
   88 static void
   89 db_set_breakpoint(map, addr, count)
   90         vm_map_t        map;
   91         db_addr_t       addr;
   92         int             count;
   93 {
   94         register db_breakpoint_t        bkpt;
   95 
   96         if (db_find_breakpoint(map, addr)) {
   97             db_printf("Already set.\n");
   98             return;
   99         }
  100 
  101         bkpt = db_breakpoint_alloc();
  102         if (bkpt == 0) {
  103             db_printf("Too many breakpoints.\n");
  104             return;
  105         }
  106 
  107         bkpt->map = map;
  108         bkpt->address = addr;
  109         bkpt->flags = 0;
  110         bkpt->init_count = count;
  111         bkpt->count = count;
  112 
  113         bkpt->link = db_breakpoint_list;
  114         db_breakpoint_list = bkpt;
  115 }
  116 
  117 static void
  118 db_delete_breakpoint(map, addr)
  119         vm_map_t        map;
  120         db_addr_t       addr;
  121 {
  122         register db_breakpoint_t        bkpt;
  123         register db_breakpoint_t        *prev;
  124 
  125         for (prev = &db_breakpoint_list;
  126              (bkpt = *prev) != 0;
  127              prev = &bkpt->link) {
  128             if (db_map_equal(bkpt->map, map) &&
  129                 (bkpt->address == addr)) {
  130                 *prev = bkpt->link;
  131                 break;
  132             }
  133         }
  134         if (bkpt == 0) {
  135             db_printf("Not set.\n");
  136             return;
  137         }
  138 
  139         db_breakpoint_free(bkpt);
  140 }
  141 
  142 static db_breakpoint_t
  143 db_find_breakpoint(map, addr)
  144         vm_map_t        map;
  145         db_addr_t       addr;
  146 {
  147         register db_breakpoint_t        bkpt;
  148 
  149         for (bkpt = db_breakpoint_list;
  150              bkpt != 0;
  151              bkpt = bkpt->link)
  152         {
  153             if (db_map_equal(bkpt->map, map) &&
  154                 (bkpt->address == addr))
  155                 return (bkpt);
  156         }
  157         return (0);
  158 }
  159 
  160 db_breakpoint_t
  161 db_find_breakpoint_here(addr)
  162         db_addr_t       addr;
  163 {
  164     return db_find_breakpoint(db_map_addr(addr), addr);
  165 }
  166 
  167 static boolean_t        db_breakpoints_inserted = TRUE;
  168 
  169 #ifndef BKPT_WRITE
  170 #define BKPT_WRITE(addr, storage)                               \
  171 do {                                                            \
  172         *storage = db_get_value(addr, BKPT_SIZE, FALSE);        \
  173         db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage));      \
  174 } while (0)
  175 #endif
  176 
  177 #ifndef BKPT_CLEAR
  178 #define BKPT_CLEAR(addr, storage) \
  179         db_put_value(addr, BKPT_SIZE, *storage)
  180 #endif
  181 
  182 void
  183 db_set_breakpoints()
  184 {
  185         register db_breakpoint_t        bkpt;
  186 
  187         if (!db_breakpoints_inserted) {
  188 
  189                 for (bkpt = db_breakpoint_list;
  190                      bkpt != 0;
  191                      bkpt = bkpt->link)
  192                         if (db_map_current(bkpt->map)) {
  193                                 BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  194                         }
  195                 db_breakpoints_inserted = TRUE;
  196         }
  197 }
  198 
  199 void
  200 db_clear_breakpoints()
  201 {
  202         register db_breakpoint_t        bkpt;
  203 
  204         if (db_breakpoints_inserted) {
  205 
  206                 for (bkpt = db_breakpoint_list;
  207                      bkpt != 0;
  208                      bkpt = bkpt->link)
  209                         if (db_map_current(bkpt->map)) {
  210                                 BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  211                         }
  212                 db_breakpoints_inserted = FALSE;
  213         }
  214 }
  215 
  216 #ifdef SOFTWARE_SSTEP
  217 /*
  218  * Set a temporary breakpoint.
  219  * The instruction is changed immediately,
  220  * so the breakpoint does not have to be on the breakpoint list.
  221  */
  222 db_breakpoint_t
  223 db_set_temp_breakpoint(addr)
  224         db_addr_t       addr;
  225 {
  226         register db_breakpoint_t        bkpt;
  227 
  228         bkpt = db_breakpoint_alloc();
  229         if (bkpt == 0) {
  230             db_printf("Too many breakpoints.\n");
  231             return 0;
  232         }
  233 
  234         bkpt->map = NULL;
  235         bkpt->address = addr;
  236         bkpt->flags = BKPT_TEMP;
  237         bkpt->init_count = 1;
  238         bkpt->count = 1;
  239 
  240         BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  241         return bkpt;
  242 }
  243 
  244 void
  245 db_delete_temp_breakpoint(bkpt)
  246         db_breakpoint_t bkpt;
  247 {
  248         BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  249         db_breakpoint_free(bkpt);
  250 }
  251 #endif /* SOFTWARE_SSTEP */
  252 
  253 /*
  254  * List breakpoints.
  255  */
  256 static void
  257 db_list_breakpoints()
  258 {
  259         register db_breakpoint_t        bkpt;
  260 
  261         if (db_breakpoint_list == 0) {
  262             db_printf("No breakpoints set\n");
  263             return;
  264         }
  265 
  266         db_printf(" Map      Count    Address\n");
  267         for (bkpt = db_breakpoint_list;
  268              bkpt != 0;
  269              bkpt = bkpt->link) {
  270             db_printf("%s%8p %5d    ",
  271                       db_map_current(bkpt->map) ? "*" : " ",
  272                       (void *)bkpt->map, bkpt->init_count);
  273             db_printsym(bkpt->address, DB_STGY_PROC);
  274             db_printf("\n");
  275         }
  276 }
  277 
  278 /* Delete breakpoint */
  279 /*ARGSUSED*/
  280 void
  281 db_delete_cmd(addr, have_addr, count, modif)
  282         db_expr_t       addr;
  283         boolean_t       have_addr;
  284         db_expr_t       count;
  285         char *          modif;
  286 {
  287         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  288 }
  289 
  290 /* Set breakpoint with skip count */
  291 /*ARGSUSED*/
  292 void
  293 db_breakpoint_cmd(addr, have_addr, count, modif)
  294         db_expr_t       addr;
  295         boolean_t       have_addr;
  296         db_expr_t       count;
  297         char *          modif;
  298 {
  299         if (count == -1)
  300             count = 1;
  301 
  302         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  303 }
  304 
  305 /* list breakpoints */
  306 void
  307 db_listbreak_cmd(dummy1, dummy2, dummy3, dummy4)
  308         db_expr_t       dummy1;
  309         boolean_t       dummy2;
  310         db_expr_t       dummy3;
  311         char *          dummy4;
  312 {
  313         db_list_breakpoints();
  314 }
  315 
  316 /*
  317  *      We want ddb to be usable before most of the kernel has been
  318  *      initialized.  In particular, current_thread() or kernel_map
  319  *      (or both) may be null.
  320  */
  321 
  322 boolean_t
  323 db_map_equal(map1, map2)
  324         vm_map_t        map1, map2;
  325 {
  326         return ((map1 == map2) ||
  327                 ((map1 == NULL) && (map2 == kernel_map)) ||
  328                 ((map1 == kernel_map) && (map2 == NULL)));
  329 }
  330 
  331 boolean_t
  332 db_map_current(map)
  333         vm_map_t        map;
  334 {
  335 #if 0
  336         thread_t        thread;
  337 
  338         return ((map == NULL) ||
  339                 (map == kernel_map) ||
  340                 (((thread = current_thread()) != NULL) &&
  341                  (map == thread->task->map)));
  342 #else
  343         return (1);
  344 #endif
  345 }
  346 
  347 vm_map_t
  348 db_map_addr(addr)
  349         vm_offset_t addr;
  350 {
  351 #if 0
  352         thread_t        thread;
  353 
  354         /*
  355          *      We want to return kernel_map for all
  356          *      non-user addresses, even when debugging
  357          *      kernel tasks with their own maps.
  358          */
  359 
  360         if ((VM_MIN_ADDRESS <= addr) &&
  361             (addr < VM_MAX_ADDRESS) &&
  362             ((thread = current_thread()) != NULL))
  363             return thread->task->map;
  364         else
  365 #endif
  366             return kernel_map;
  367 }
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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_break.c

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