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  * $FreeBSD: src/sys/ddb/db_watch.c,v 1.20.2.1 2001/07/25 01:00:08 bsd Exp $
   27  * $DragonFly: src/sys/ddb/db_watch.c,v 1.5 2005/12/23 21:35:44 swildner Exp $
   28  */
   29 
   30 /*
   31  *      Author: Richard P. Draves, Carnegie Mellon University
   32  *      Date:   10/90
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/kernel.h>
   37 
   38 #include <vm/vm.h>
   39 #include <sys/lock.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,
   61                                         db_addr_t addr);
   62 #ifdef notused
   63 static boolean_t        db_find_watchpoint (vm_map_t map, db_addr_t addr,
   64                                         db_regs_t *regs);
   65 #endif
   66 static void             db_list_watchpoints (void);
   67 static void             db_set_watchpoint (vm_map_t map, db_addr_t addr,
   68                                        vm_size_t size);
   69 
   70 int  db_md_set_watchpoint   (db_expr_t addr, db_expr_t size);
   71 int  db_md_clr_watchpoint   (db_expr_t addr, db_expr_t size);
   72 void db_md_list_watchpoints (void);
   73 
   74 
   75 db_watchpoint_t
   76 db_watchpoint_alloc(void)
   77 {
   78         db_watchpoint_t watch;
   79 
   80         if ((watch = db_free_watchpoints) != 0) {
   81             db_free_watchpoints = watch->link;
   82             return (watch);
   83         }
   84         if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
   85             db_printf("All watchpoints used.\n");
   86             return (0);
   87         }
   88         watch = db_next_free_watchpoint;
   89         db_next_free_watchpoint++;
   90 
   91         return (watch);
   92 }
   93 
   94 void
   95 db_watchpoint_free(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(vm_map_t map, db_addr_t addr, vm_size_t size)
  103 {
  104         db_watchpoint_t watch;
  105 
  106         if (map == NULL) {
  107             db_printf("No map.\n");
  108             return;
  109         }
  110 
  111         /*
  112          *      Should we do anything fancy with overlapping regions?
  113          */
  114 
  115         for (watch = db_watchpoint_list;
  116              watch != 0;
  117              watch = watch->link)
  118             if (db_map_equal(watch->map, map) &&
  119                 (watch->loaddr == addr) &&
  120                 (watch->hiaddr == addr+size)) {
  121                 db_printf("Already set.\n");
  122                 return;
  123             }
  124 
  125         watch = db_watchpoint_alloc();
  126         if (watch == 0) {
  127             db_printf("Too many watchpoints.\n");
  128             return;
  129         }
  130 
  131         watch->map = map;
  132         watch->loaddr = addr;
  133         watch->hiaddr = addr+size;
  134 
  135         watch->link = db_watchpoint_list;
  136         db_watchpoint_list = watch;
  137 
  138         db_watchpoints_inserted = FALSE;
  139 }
  140 
  141 static void
  142 db_delete_watchpoint(vm_map_t map, db_addr_t addr)
  143 {
  144         db_watchpoint_t watch;
  145         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(void)
  163 {
  164         db_watchpoint_t watch;
  165 
  166         if (db_watchpoint_list == 0) {
  167             db_printf("No watchpoints set\n");
  168             return;
  169         }
  170 
  171         db_printf(" Map        Address  Size\n");
  172         for (watch = db_watchpoint_list;
  173              watch != 0;
  174              watch = watch->link)
  175             db_printf("%s%8p  %8lx  %lx\n",
  176                       db_map_current(watch->map) ? "*" : " ",
  177                       (void *)watch->map, (long)watch->loaddr,
  178                       (long)watch->hiaddr - (long)watch->loaddr);
  179 }
  180 
  181 /* Delete watchpoint */
  182 /*ARGSUSED*/
  183 void
  184 db_deletewatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  185                    char *modif)
  186 {
  187         db_delete_watchpoint(db_map_addr(addr), addr);
  188 }
  189 
  190 /* Set watchpoint */
  191 /*ARGSUSED*/
  192 void
  193 db_watchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  194                   char *modif)
  195 {
  196         vm_size_t       size;
  197         db_expr_t       value;
  198 
  199         if (db_expression(&value))
  200             size = (vm_size_t) value;
  201         else
  202             size = 4;
  203         db_skip_to_eol();
  204 
  205         db_set_watchpoint(db_map_addr(addr), addr, size);
  206 }
  207 
  208 /*
  209  * At least one non-optional show-command must be implemented using
  210  * DB_SHOW_COMMAND() so that db_show_cmd_set gets created.  Here is one.
  211  */
  212 DB_SHOW_COMMAND(watches, db_listwatch_cmd)
  213 {
  214         db_list_watchpoints();
  215         db_md_list_watchpoints();
  216 }
  217 
  218 void
  219 db_set_watchpoints(void)
  220 {
  221         db_watchpoint_t watch;
  222 
  223         if (!db_watchpoints_inserted) {
  224             for (watch = db_watchpoint_list;
  225                  watch != 0;
  226                  watch = watch->link)
  227                 pmap_protect(watch->map->pmap,
  228                              trunc_page(watch->loaddr),
  229                              round_page(watch->hiaddr),
  230                              VM_PROT_READ);
  231 
  232             db_watchpoints_inserted = TRUE;
  233         }
  234 }
  235 
  236 void
  237 db_clear_watchpoints(void)
  238 {
  239         db_watchpoints_inserted = FALSE;
  240 }
  241 
  242 #ifdef notused
  243 static boolean_t
  244 db_find_watchpoint(vm_map_t map, db_addr_t addr, db_regs_t *regs)
  245 {
  246         db_watchpoint_t watch;
  247         db_watchpoint_t found = 0;
  248 
  249         for (watch = db_watchpoint_list;
  250              watch != 0;
  251              watch = watch->link)
  252             if (db_map_equal(watch->map, map)) {
  253                 if ((watch->loaddr <= addr) &&
  254                     (addr < watch->hiaddr))
  255                     return (TRUE);
  256                 else if ((trunc_page(watch->loaddr) <= addr) &&
  257                          (addr < round_page(watch->hiaddr)))
  258                     found = watch;
  259             }
  260 
  261         /*
  262          *      We didn't hit exactly on a watchpoint, but we are
  263          *      in a protected region.  We want to single-step
  264          *      and then re-protect.
  265          */
  266 
  267         if (found) {
  268             db_watchpoints_inserted = FALSE;
  269             db_single_step(regs);
  270         }
  271 
  272         return (FALSE);
  273 }
  274 #endif
  275 
  276 
  277 
  278 /* Delete hardware watchpoint */
  279 /*ARGSUSED*/
  280 void
  281 db_deletehwatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  282                     char *modif)
  283 {
  284         int rc;
  285 
  286         if (count < 0)
  287                 count = 4;
  288 
  289         rc = db_md_clr_watchpoint(addr, count);
  290         if (rc < 0)
  291                 db_printf("hardware watchpoint could not be deleted\n");
  292 }
  293 
  294 /* Set hardware watchpoint */
  295 /*ARGSUSED*/
  296 void
  297 db_hwatchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
  298                    char *modif)
  299 {
  300         int rc;
  301 
  302         if (count < 0)
  303                 count = 4;
  304 
  305         rc = db_md_set_watchpoint(addr, count);
  306         if (rc < 0)
  307                 db_printf("hardware watchpoint could not be set\n");
  308 }

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

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