The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_watch.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  *      Author: Richard P. Draves, Carnegie Mellon University
   28  *      Date:   10/90
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/8.3/sys/ddb/db_watch.c 199583 2009-11-20 15:27:52Z jhb $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/proc.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/pmap.h>
   41 #include <vm/vm_map.h>
   42 
   43 #include <ddb/ddb.h>
   44 #include <ddb/db_watch.h>
   45 
   46 /*
   47  * Watchpoints.
   48  */
   49 
   50 static boolean_t        db_watchpoints_inserted = TRUE;
   51 
   52 #define NWATCHPOINTS    100
   53 static struct db_watchpoint     db_watch_table[NWATCHPOINTS];
   54 static db_watchpoint_t  db_next_free_watchpoint = &db_watch_table[0];
   55 static db_watchpoint_t  db_free_watchpoints = 0;
   56 static db_watchpoint_t  db_watchpoint_list = 0;
   57 
   58 static db_watchpoint_t  db_watchpoint_alloc(void);
   59 static void             db_watchpoint_free(db_watchpoint_t watch);
   60 static void             db_delete_watchpoint(vm_map_t map, db_addr_t addr);
   61 #ifdef notused
   62 static boolean_t        db_find_watchpoint(vm_map_t map, db_addr_t addr,
   63                                         db_regs_t *regs);
   64 #endif
   65 static void             db_list_watchpoints(void);
   66 static void             db_set_watchpoint(vm_map_t map, db_addr_t addr,
   67                                        vm_size_t size);
   68 
   69 static db_watchpoint_t
   70 db_watchpoint_alloc()
   71 {
   72         register db_watchpoint_t        watch;
   73 
   74         if ((watch = db_free_watchpoints) != 0) {
   75             db_free_watchpoints = watch->link;
   76             return (watch);
   77         }
   78         if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
   79             db_printf("All watchpoints used.\n");
   80             return (0);
   81         }
   82         watch = db_next_free_watchpoint;
   83         db_next_free_watchpoint++;
   84 
   85         return (watch);
   86 }
   87 
   88 static void
   89 db_watchpoint_free(watch)
   90         register db_watchpoint_t        watch;
   91 {
   92         watch->link = db_free_watchpoints;
   93         db_free_watchpoints = watch;
   94 }
   95 
   96 static void
   97 db_set_watchpoint(map, addr, size)
   98         vm_map_t        map;
   99         db_addr_t       addr;
  100         vm_size_t       size;
  101 {
  102         register db_watchpoint_t        watch;
  103 
  104         if (map == NULL) {
  105             db_printf("No map.\n");
  106             return;
  107         }
  108 
  109         /*
  110          *      Should we do anything fancy with overlapping regions?
  111          */
  112 
  113         for (watch = db_watchpoint_list;
  114              watch != 0;
  115              watch = watch->link)
  116             if (db_map_equal(watch->map, map) &&
  117                 (watch->loaddr == addr) &&
  118                 (watch->hiaddr == addr+size)) {
  119                 db_printf("Already set.\n");
  120                 return;
  121             }
  122 
  123         watch = db_watchpoint_alloc();
  124         if (watch == 0) {
  125             db_printf("Too many watchpoints.\n");
  126             return;
  127         }
  128 
  129         watch->map = map;
  130         watch->loaddr = addr;
  131         watch->hiaddr = addr+size;
  132 
  133         watch->link = db_watchpoint_list;
  134         db_watchpoint_list = watch;
  135 
  136         db_watchpoints_inserted = FALSE;
  137 }
  138 
  139 static void
  140 db_delete_watchpoint(map, addr)
  141         vm_map_t        map;
  142         db_addr_t       addr;
  143 {
  144         register db_watchpoint_t        watch;
  145         register db_watchpoint_t        *prev;
  146 
  147         for (prev = &db_watchpoint_list;
  148              (watch = *prev) != 0;
  149              prev = &watch->link)
  150             if (db_map_equal(watch->map, map) &&
  151                 (watch->loaddr <= addr) &&
  152                 (addr < watch->hiaddr)) {
  153                 *prev = watch->link;
  154                 db_watchpoint_free(watch);
  155                 return;
  156             }
  157 
  158         db_printf("Not set.\n");
  159 }
  160 
  161 static void
  162 db_list_watchpoints()
  163 {
  164         register db_watchpoint_t        watch;
  165 
  166         if (db_watchpoint_list == 0) {
  167             db_printf("No watchpoints set\n");
  168             return;
  169         }
  170 
  171 #ifdef __LP64__
  172         db_printf(" Map                Address          Size\n");
  173 #else
  174         db_printf(" Map        Address  Size\n");
  175 #endif
  176         for (watch = db_watchpoint_list;
  177              watch != 0;
  178              watch = watch->link)
  179 #ifdef __LP64__
  180             db_printf("%s%16p  %16lx  %lx\n",
  181 #else
  182             db_printf("%s%8p  %8lx  %lx\n",
  183 #endif
  184                       db_map_current(watch->map) ? "*" : " ",
  185                       (void *)watch->map, (long)watch->loaddr,
  186                       (long)watch->hiaddr - (long)watch->loaddr);
  187 }
  188 
  189 /* Delete watchpoint */
  190 /*ARGSUSED*/
  191 void
  192 db_deletewatch_cmd(addr, have_addr, count, modif)
  193         db_expr_t       addr;
  194         boolean_t       have_addr;
  195         db_expr_t       count;
  196         char *          modif;
  197 {
  198         db_delete_watchpoint(db_map_addr(addr), addr);
  199 }
  200 
  201 /* Set watchpoint */
  202 /*ARGSUSED*/
  203 void
  204 db_watchpoint_cmd(addr, have_addr, count, modif)
  205         db_expr_t       addr;
  206         boolean_t       have_addr;
  207         db_expr_t       count;
  208         char *          modif;
  209 {
  210         vm_size_t       size;
  211         db_expr_t       value;
  212 
  213         if (db_expression(&value))
  214             size = (vm_size_t) value;
  215         else
  216             size = 4;
  217         db_skip_to_eol();
  218 
  219         db_set_watchpoint(db_map_addr(addr), addr, size);
  220 }
  221 
  222 /*
  223  * At least one non-optional show-command must be implemented using
  224  * DB_SHOW_COMMAND() so that db_show_cmd_set gets created.  Here is one.
  225  */
  226 DB_SHOW_COMMAND(watches, db_listwatch_cmd)
  227 {
  228         db_list_watchpoints();
  229         db_md_list_watchpoints();
  230 }
  231 
  232 void
  233 db_set_watchpoints()
  234 {
  235         register db_watchpoint_t        watch;
  236 
  237         if (!db_watchpoints_inserted) {
  238             for (watch = db_watchpoint_list;
  239                  watch != 0;
  240                  watch = watch->link)
  241                 pmap_protect(watch->map->pmap,
  242                              trunc_page(watch->loaddr),
  243                              round_page(watch->hiaddr),
  244                              VM_PROT_READ);
  245 
  246             db_watchpoints_inserted = TRUE;
  247         }
  248 }
  249 
  250 void
  251 db_clear_watchpoints()
  252 {
  253         db_watchpoints_inserted = FALSE;
  254 }
  255 
  256 #ifdef notused
  257 static boolean_t
  258 db_find_watchpoint(map, addr, regs)
  259         vm_map_t        map;
  260         db_addr_t       addr;
  261         db_regs_t       *regs;
  262 {
  263         register db_watchpoint_t watch;
  264         db_watchpoint_t found = 0;
  265 
  266         for (watch = db_watchpoint_list;
  267              watch != 0;
  268              watch = watch->link)
  269             if (db_map_equal(watch->map, map)) {
  270                 if ((watch->loaddr <= addr) &&
  271                     (addr < watch->hiaddr))
  272                     return (TRUE);
  273                 else if ((trunc_page(watch->loaddr) <= addr) &&
  274                          (addr < round_page(watch->hiaddr)))
  275                     found = watch;
  276             }
  277 
  278         /*
  279          *      We didn't hit exactly on a watchpoint, but we are
  280          *      in a protected region.  We want to single-step
  281          *      and then re-protect.
  282          */
  283 
  284         if (found) {
  285             db_watchpoints_inserted = FALSE;
  286             db_single_step(regs);
  287         }
  288 
  289         return (FALSE);
  290 }
  291 #endif
  292 
  293 
  294 
  295 /* Delete hardware watchpoint */
  296 /*ARGSUSED*/
  297 void
  298 db_deletehwatch_cmd(addr, have_addr, count, modif)
  299         db_expr_t       addr;
  300         boolean_t       have_addr;
  301         db_expr_t       count;
  302         char *          modif;
  303 {
  304         int rc;
  305 
  306         if (count < 0)
  307                 count = 4;
  308 
  309         rc = db_md_clr_watchpoint(addr, count);
  310         if (rc < 0)
  311                 db_printf("hardware watchpoint could not be deleted\n");
  312 }
  313 
  314 /* Set hardware watchpoint */
  315 /*ARGSUSED*/
  316 void
  317 db_hwatchpoint_cmd(addr, have_addr, count, modif)
  318         db_expr_t       addr;
  319         boolean_t       have_addr;
  320         db_expr_t       count;
  321         char *          modif;
  322 {
  323         int rc;
  324 
  325         if (count < 0)
  326                 count = 4;
  327 
  328         rc = db_md_set_watchpoint(addr, count);
  329         if (rc < 0)
  330                 db_printf("hardware watchpoint could not be set\n");
  331 }

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