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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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/6.0/sys/ddb/db_watch.c 139747 2005-01-06 01:34:41Z imp $");
   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 int  db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
   70 int  db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
   71 void db_md_list_watchpoints(void);
   72 
   73 
   74 static db_watchpoint_t
   75 db_watchpoint_alloc()
   76 {
   77         register db_watchpoint_t        watch;
   78 
   79         if ((watch = db_free_watchpoints) != 0) {
   80             db_free_watchpoints = watch->link;
   81             return (watch);
   82         }
   83         if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
   84             db_printf("All watchpoints used.\n");
   85             return (0);
   86         }
   87         watch = db_next_free_watchpoint;
   88         db_next_free_watchpoint++;
   89 
   90         return (watch);
   91 }
   92 
   93 static void
   94 db_watchpoint_free(watch)
   95         register db_watchpoint_t        watch;
   96 {
   97         watch->link = db_free_watchpoints;
   98         db_free_watchpoints = watch;
   99 }
  100 
  101 static void
  102 db_set_watchpoint(map, addr, size)
  103         vm_map_t        map;
  104         db_addr_t       addr;
  105         vm_size_t       size;
  106 {
  107         register db_watchpoint_t        watch;
  108 
  109         if (map == NULL) {
  110             db_printf("No map.\n");
  111             return;
  112         }
  113 
  114         /*
  115          *      Should we do anything fancy with overlapping regions?
  116          */
  117 
  118         for (watch = db_watchpoint_list;
  119              watch != 0;
  120              watch = watch->link)
  121             if (db_map_equal(watch->map, map) &&
  122                 (watch->loaddr == addr) &&
  123                 (watch->hiaddr == addr+size)) {
  124                 db_printf("Already set.\n");
  125                 return;
  126             }
  127 
  128         watch = db_watchpoint_alloc();
  129         if (watch == 0) {
  130             db_printf("Too many watchpoints.\n");
  131             return;
  132         }
  133 
  134         watch->map = map;
  135         watch->loaddr = addr;
  136         watch->hiaddr = addr+size;
  137 
  138         watch->link = db_watchpoint_list;
  139         db_watchpoint_list = watch;
  140 
  141         db_watchpoints_inserted = FALSE;
  142 }
  143 
  144 static void
  145 db_delete_watchpoint(map, addr)
  146         vm_map_t        map;
  147         db_addr_t       addr;
  148 {
  149         register db_watchpoint_t        watch;
  150         register db_watchpoint_t        *prev;
  151 
  152         for (prev = &db_watchpoint_list;
  153              (watch = *prev) != 0;
  154              prev = &watch->link)
  155             if (db_map_equal(watch->map, map) &&
  156                 (watch->loaddr <= addr) &&
  157                 (addr < watch->hiaddr)) {
  158                 *prev = watch->link;
  159                 db_watchpoint_free(watch);
  160                 return;
  161             }
  162 
  163         db_printf("Not set.\n");
  164 }
  165 
  166 static void
  167 db_list_watchpoints()
  168 {
  169         register db_watchpoint_t        watch;
  170 
  171         if (db_watchpoint_list == 0) {
  172             db_printf("No watchpoints set\n");
  173             return;
  174         }
  175 
  176         db_printf(" Map        Address  Size\n");
  177         for (watch = db_watchpoint_list;
  178              watch != 0;
  179              watch = watch->link)
  180             db_printf("%s%8p  %8lx  %lx\n",
  181                       db_map_current(watch->map) ? "*" : " ",
  182                       (void *)watch->map, (long)watch->loaddr,
  183                       (long)watch->hiaddr - (long)watch->loaddr);
  184 }
  185 
  186 /* Delete watchpoint */
  187 /*ARGSUSED*/
  188 void
  189 db_deletewatch_cmd(addr, have_addr, count, modif)
  190         db_expr_t       addr;
  191         boolean_t       have_addr;
  192         db_expr_t       count;
  193         char *          modif;
  194 {
  195         db_delete_watchpoint(db_map_addr(addr), addr);
  196 }
  197 
  198 /* Set watchpoint */
  199 /*ARGSUSED*/
  200 void
  201 db_watchpoint_cmd(addr, have_addr, count, modif)
  202         db_expr_t       addr;
  203         boolean_t       have_addr;
  204         db_expr_t       count;
  205         char *          modif;
  206 {
  207         vm_size_t       size;
  208         db_expr_t       value;
  209 
  210         if (db_expression(&value))
  211             size = (vm_size_t) value;
  212         else
  213             size = 4;
  214         db_skip_to_eol();
  215 
  216         db_set_watchpoint(db_map_addr(addr), addr, size);
  217 }
  218 
  219 /*
  220  * At least one non-optional show-command must be implemented using
  221  * DB_SHOW_COMMAND() so that db_show_cmd_set gets created.  Here is one.
  222  */
  223 DB_SHOW_COMMAND(watches, db_listwatch_cmd)
  224 {
  225         db_list_watchpoints();
  226         db_md_list_watchpoints();
  227 }
  228 
  229 void
  230 db_set_watchpoints()
  231 {
  232         register db_watchpoint_t        watch;
  233 
  234         if (!db_watchpoints_inserted) {
  235             for (watch = db_watchpoint_list;
  236                  watch != 0;
  237                  watch = watch->link)
  238                 pmap_protect(watch->map->pmap,
  239                              trunc_page(watch->loaddr),
  240                              round_page(watch->hiaddr),
  241                              VM_PROT_READ);
  242 
  243             db_watchpoints_inserted = TRUE;
  244         }
  245 }
  246 
  247 void
  248 db_clear_watchpoints()
  249 {
  250         db_watchpoints_inserted = FALSE;
  251 }
  252 
  253 #ifdef notused
  254 static boolean_t
  255 db_find_watchpoint(map, addr, regs)
  256         vm_map_t        map;
  257         db_addr_t       addr;
  258         db_regs_t       *regs;
  259 {
  260         register db_watchpoint_t watch;
  261         db_watchpoint_t found = 0;
  262 
  263         for (watch = db_watchpoint_list;
  264              watch != 0;
  265              watch = watch->link)
  266             if (db_map_equal(watch->map, map)) {
  267                 if ((watch->loaddr <= addr) &&
  268                     (addr < watch->hiaddr))
  269                     return (TRUE);
  270                 else if ((trunc_page(watch->loaddr) <= addr) &&
  271                          (addr < round_page(watch->hiaddr)))
  272                     found = watch;
  273             }
  274 
  275         /*
  276          *      We didn't hit exactly on a watchpoint, but we are
  277          *      in a protected region.  We want to single-step
  278          *      and then re-protect.
  279          */
  280 
  281         if (found) {
  282             db_watchpoints_inserted = FALSE;
  283             db_single_step(regs);
  284         }
  285 
  286         return (FALSE);
  287 }
  288 #endif
  289 
  290 
  291 
  292 /* Delete hardware watchpoint */
  293 /*ARGSUSED*/
  294 void
  295 db_deletehwatch_cmd(addr, have_addr, count, modif)
  296         db_expr_t       addr;
  297         boolean_t       have_addr;
  298         db_expr_t       count;
  299         char *          modif;
  300 {
  301         int rc;
  302 
  303         if (count < 0)
  304                 count = 4;
  305 
  306         rc = db_md_clr_watchpoint(addr, count);
  307         if (rc < 0)
  308                 db_printf("hardware watchpoint could not be deleted\n");
  309 }
  310 
  311 /* Set hardware watchpoint */
  312 /*ARGSUSED*/
  313 void
  314 db_hwatchpoint_cmd(addr, have_addr, count, modif)
  315         db_expr_t       addr;
  316         boolean_t       have_addr;
  317         db_expr_t       count;
  318         char *          modif;
  319 {
  320         int rc;
  321 
  322         if (count < 0)
  323                 count = 4;
  324 
  325         rc = db_md_set_watchpoint(addr, count);
  326         if (rc < 0)
  327                 db_printf("hardware watchpoint could not be set\n");
  328 }

Cache object: 79559ec95c80f26013377c5614897a35


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.