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/11.2/sys/ddb/db_break.c 283248 2015-05-21 15:16:18Z pfg $");
   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(void)
   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(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(vm_map_t map, db_addr_t addr, int count)
   89 {
   90         register db_breakpoint_t        bkpt;
   91 
   92         if (db_find_breakpoint(map, addr)) {
   93             db_printf("Already set.\n");
   94             return;
   95         }
   96 
   97         bkpt = db_breakpoint_alloc();
   98         if (bkpt == 0) {
   99             db_printf("Too many breakpoints.\n");
  100             return;
  101         }
  102 
  103         bkpt->map = map;
  104         bkpt->address = addr;
  105         bkpt->flags = 0;
  106         bkpt->init_count = count;
  107         bkpt->count = count;
  108 
  109         bkpt->link = db_breakpoint_list;
  110         db_breakpoint_list = bkpt;
  111 }
  112 
  113 static void
  114 db_delete_breakpoint(vm_map_t map, db_addr_t addr)
  115 {
  116         register db_breakpoint_t        bkpt;
  117         register db_breakpoint_t        *prev;
  118 
  119         for (prev = &db_breakpoint_list;
  120              (bkpt = *prev) != 0;
  121              prev = &bkpt->link) {
  122             if (db_map_equal(bkpt->map, map) &&
  123                 (bkpt->address == addr)) {
  124                 *prev = bkpt->link;
  125                 break;
  126             }
  127         }
  128         if (bkpt == 0) {
  129             db_printf("Not set.\n");
  130             return;
  131         }
  132 
  133         db_breakpoint_free(bkpt);
  134 }
  135 
  136 static db_breakpoint_t
  137 db_find_breakpoint(vm_map_t map, db_addr_t addr)
  138 {
  139         register db_breakpoint_t        bkpt;
  140 
  141         for (bkpt = db_breakpoint_list;
  142              bkpt != 0;
  143              bkpt = bkpt->link)
  144         {
  145             if (db_map_equal(bkpt->map, map) &&
  146                 (bkpt->address == addr))
  147                 return (bkpt);
  148         }
  149         return (0);
  150 }
  151 
  152 db_breakpoint_t
  153 db_find_breakpoint_here(db_addr_t addr)
  154 {
  155         return db_find_breakpoint(db_map_addr(addr), addr);
  156 }
  157 
  158 static bool     db_breakpoints_inserted = true;
  159 
  160 #ifndef BKPT_WRITE
  161 #define BKPT_WRITE(addr, storage)                               \
  162 do {                                                            \
  163         *storage = db_get_value(addr, BKPT_SIZE, false);        \
  164         db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage));      \
  165 } while (0)
  166 #endif
  167 
  168 #ifndef BKPT_CLEAR
  169 #define BKPT_CLEAR(addr, storage) \
  170         db_put_value(addr, BKPT_SIZE, *storage)
  171 #endif
  172 
  173 void
  174 db_set_breakpoints(void)
  175 {
  176         register db_breakpoint_t        bkpt;
  177 
  178         if (!db_breakpoints_inserted) {
  179 
  180                 for (bkpt = db_breakpoint_list;
  181                      bkpt != 0;
  182                      bkpt = bkpt->link)
  183                         if (db_map_current(bkpt->map)) {
  184                                 BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  185                         }
  186                 db_breakpoints_inserted = true;
  187         }
  188 }
  189 
  190 void
  191 db_clear_breakpoints(void)
  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                                 BKPT_CLEAR(bkpt->address, &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(db_addr_t addr)
  215 {
  216         register db_breakpoint_t        bkpt;
  217 
  218         bkpt = db_breakpoint_alloc();
  219         if (bkpt == 0) {
  220             db_printf("Too many breakpoints.\n");
  221             return 0;
  222         }
  223 
  224         bkpt->map = NULL;
  225         bkpt->address = addr;
  226         bkpt->flags = BKPT_TEMP;
  227         bkpt->init_count = 1;
  228         bkpt->count = 1;
  229 
  230         BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
  231         return bkpt;
  232 }
  233 
  234 void
  235 db_delete_temp_breakpoint(db_breakpoint_t bkpt)
  236 {
  237         BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
  238         db_breakpoint_free(bkpt);
  239 }
  240 #endif /* SOFTWARE_SSTEP */
  241 
  242 /*
  243  * List breakpoints.
  244  */
  245 static void
  246 db_list_breakpoints(void)
  247 {
  248         register db_breakpoint_t        bkpt;
  249 
  250         if (db_breakpoint_list == 0) {
  251             db_printf("No breakpoints set\n");
  252             return;
  253         }
  254 
  255         db_printf(" Map      Count    Address\n");
  256         for (bkpt = db_breakpoint_list;
  257              bkpt != 0;
  258              bkpt = bkpt->link) {
  259             db_printf("%s%8p %5d    ",
  260                       db_map_current(bkpt->map) ? "*" : " ",
  261                       (void *)bkpt->map, bkpt->init_count);
  262             db_printsym(bkpt->address, DB_STGY_PROC);
  263             db_printf("\n");
  264         }
  265 }
  266 
  267 /* Delete breakpoint */
  268 /*ARGSUSED*/
  269 void
  270 db_delete_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
  271 {
  272         db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
  273 }
  274 
  275 /* Set breakpoint with skip count */
  276 /*ARGSUSED*/
  277 void
  278 db_breakpoint_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
  279 {
  280         if (count == -1)
  281             count = 1;
  282 
  283         db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
  284 }
  285 
  286 /* list breakpoints */
  287 void
  288 db_listbreak_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
  289 {
  290         db_list_breakpoints();
  291 }
  292 
  293 /*
  294  *      We want ddb to be usable before most of the kernel has been
  295  *      initialized.  In particular, current_thread() or kernel_map
  296  *      (or both) may be null.
  297  */
  298 
  299 bool
  300 db_map_equal(vm_map_t map1, vm_map_t map2)
  301 {
  302         return ((map1 == map2) ||
  303                 ((map1 == NULL) && (map2 == kernel_map)) ||
  304                 ((map1 == kernel_map) && (map2 == NULL)));
  305 }
  306 
  307 bool
  308 db_map_current(vm_map_t map)
  309 {
  310 #if 0
  311         thread_t        thread;
  312 
  313         return ((map == NULL) ||
  314                 (map == kernel_map) ||
  315                 (((thread = current_thread()) != NULL) &&
  316                  (map == thread->task->map)));
  317 #else
  318         return (true);
  319 #endif
  320 }
  321 
  322 vm_map_t
  323 db_map_addr(vm_offset_t addr)
  324 {
  325 #if 0
  326         thread_t        thread;
  327 
  328         /*
  329          *      We want to return kernel_map for all
  330          *      non-user addresses, even when debugging
  331          *      kernel tasks with their own maps.
  332          */
  333 
  334         if ((VM_MIN_ADDRESS <= addr) &&
  335             (addr < VM_MAX_ADDRESS) &&
  336             ((thread = current_thread()) != NULL))
  337             return thread->task->map;
  338         else
  339 #endif
  340             return kernel_map;
  341 }
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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_break.c

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