2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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.
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.
16 * Carnegie Mellon requests users of this software to return to
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19 * School of Computer Science
20 * Carnegie Mellon University
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23 * any improvements or extensions that they make and grant Carnegie the
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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 $
31 * Author: Richard P. Draves, Carnegie Mellon University
35 #include <sys/param.h>
36 #include <sys/kernel.h>
41 #include <vm/vm_map.h>
44 #include <ddb/db_watch.h>
50 static boolean_t db_watchpoints_inserted = TRUE;
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;
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,
63 static boolean_t db_find_watchpoint (vm_map_t map, db_addr_t addr,
66 static void db_list_watchpoints (void);
67 static void db_set_watchpoint (vm_map_t map, db_addr_t addr,
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);
76 db_watchpoint_alloc(void)
78 db_watchpoint_t watch;
80 if ((watch = db_free_watchpoints) != 0) {
81 db_free_watchpoints = watch->link;
84 if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
85 db_printf("All watchpoints used.\n");
88 watch = db_next_free_watchpoint;
89 db_next_free_watchpoint++;
95 db_watchpoint_free(db_watchpoint_t watch)
97 watch->link = db_free_watchpoints;
98 db_free_watchpoints = watch;
102 db_set_watchpoint(vm_map_t map, db_addr_t addr, vm_size_t size)
104 db_watchpoint_t watch;
107 db_printf("No map.\n");
112 * Should we do anything fancy with overlapping regions?
115 for (watch = db_watchpoint_list;
118 if (db_map_equal(watch->map, map) &&
119 (watch->loaddr == addr) &&
120 (watch->hiaddr == addr+size)) {
121 db_printf("Already set.\n");
125 watch = db_watchpoint_alloc();
127 db_printf("Too many watchpoints.\n");
132 watch->loaddr = addr;
133 watch->hiaddr = addr+size;
135 watch->link = db_watchpoint_list;
136 db_watchpoint_list = watch;
138 db_watchpoints_inserted = FALSE;
142 db_delete_watchpoint(vm_map_t map, db_addr_t addr)
144 db_watchpoint_t watch;
145 db_watchpoint_t *prev;
147 for (prev = &db_watchpoint_list;
148 (watch = *prev) != 0;
150 if (db_map_equal(watch->map, map) &&
151 (watch->loaddr <= addr) &&
152 (addr < watch->hiaddr)) {
154 db_watchpoint_free(watch);
158 db_printf("Not set.\n");
162 db_list_watchpoints(void)
164 db_watchpoint_t watch;
166 if (db_watchpoint_list == 0) {
167 db_printf("No watchpoints set\n");
171 db_printf(" Map Address Size\n");
172 for (watch = db_watchpoint_list;
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);
181 /* Delete watchpoint */
184 db_deletewatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
187 db_delete_watchpoint(db_map_addr(addr), addr);
193 db_watchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
199 if (db_expression(&value))
200 size = (vm_size_t) value;
205 db_set_watchpoint(db_map_addr(addr), addr, size);
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.
212 DB_SHOW_COMMAND(watches, db_listwatch_cmd)
214 db_list_watchpoints();
215 db_md_list_watchpoints();
219 db_set_watchpoints(void)
221 db_watchpoint_t watch;
223 if (!db_watchpoints_inserted) {
224 for (watch = db_watchpoint_list;
227 pmap_protect(watch->map->pmap,
228 trunc_page(watch->loaddr),
229 round_page(watch->hiaddr),
232 db_watchpoints_inserted = TRUE;
237 db_clear_watchpoints(void)
239 db_watchpoints_inserted = FALSE;
244 db_find_watchpoint(vm_map_t map, db_addr_t addr, db_regs_t *regs)
246 db_watchpoint_t watch;
247 db_watchpoint_t found = 0;
249 for (watch = db_watchpoint_list;
252 if (db_map_equal(watch->map, map)) {
253 if ((watch->loaddr <= addr) &&
254 (addr < watch->hiaddr))
256 else if ((trunc_page(watch->loaddr) <= addr) &&
257 (addr < round_page(watch->hiaddr)))
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.
268 db_watchpoints_inserted = FALSE;
269 db_single_step(regs);
278 /* Delete hardware watchpoint */
281 db_deletehwatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
289 rc = db_md_clr_watchpoint(addr, count);
291 db_printf("hardware watchpoint could not be deleted\n");
294 /* Set hardware watchpoint */
297 db_hwatchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
305 rc = db_md_set_watchpoint(addr, count);
307 db_printf("hardware watchpoint could not be set\n");