2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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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
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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 $
30 * Author: Richard P. Draves, Carnegie Mellon University
34 #include <sys/param.h>
35 #include <sys/kernel.h>
40 #include <vm/vm_map.h>
43 #include <ddb/db_watch.h>
49 static boolean_t db_watchpoints_inserted = TRUE;
51 #define NWATCHPOINTS 100
52 static struct db_watchpoint db_watch_table[NWATCHPOINTS];
53 static db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
54 static db_watchpoint_t db_free_watchpoints = 0;
55 static db_watchpoint_t db_watchpoint_list = 0;
57 static db_watchpoint_t db_watchpoint_alloc (void);
58 static void db_watchpoint_free (db_watchpoint_t watch);
59 static void db_delete_watchpoint (vm_map_t map,
62 static boolean_t db_find_watchpoint (vm_map_t map, db_addr_t addr,
65 static void db_list_watchpoints (void);
66 static void db_set_watchpoint (vm_map_t map, db_addr_t addr,
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);
74 static db_watchpoint_t
75 db_watchpoint_alloc(void)
77 db_watchpoint_t watch;
79 if ((watch = db_free_watchpoints) != 0) {
80 db_free_watchpoints = watch->link;
83 if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
84 db_printf("All watchpoints used.\n");
87 watch = db_next_free_watchpoint;
88 db_next_free_watchpoint++;
94 db_watchpoint_free(db_watchpoint_t watch)
96 watch->link = db_free_watchpoints;
97 db_free_watchpoints = watch;
101 db_set_watchpoint(vm_map_t map, db_addr_t addr, vm_size_t size)
103 db_watchpoint_t watch;
106 db_printf("No map.\n");
111 * Should we do anything fancy with overlapping regions?
114 for (watch = db_watchpoint_list;
117 if (db_map_equal(watch->map, map) &&
118 (watch->loaddr == addr) &&
119 (watch->hiaddr == addr+size)) {
120 db_printf("Already set.\n");
124 watch = db_watchpoint_alloc();
126 db_printf("Too many watchpoints.\n");
131 watch->loaddr = addr;
132 watch->hiaddr = addr+size;
134 watch->link = db_watchpoint_list;
135 db_watchpoint_list = watch;
137 db_watchpoints_inserted = FALSE;
141 db_delete_watchpoint(vm_map_t map, db_addr_t addr)
143 db_watchpoint_t watch;
144 db_watchpoint_t *prev;
146 for (prev = &db_watchpoint_list;
147 (watch = *prev) != 0;
149 if (db_map_equal(watch->map, map) &&
150 (watch->loaddr <= addr) &&
151 (addr < watch->hiaddr)) {
153 db_watchpoint_free(watch);
157 db_printf("Not set.\n");
161 db_list_watchpoints(void)
163 db_watchpoint_t watch;
165 if (db_watchpoint_list == 0) {
166 db_printf("No watchpoints set\n");
170 db_printf(" Map Address Size\n");
171 for (watch = db_watchpoint_list;
174 db_printf("%s%8p %8lx %lx\n",
175 db_map_current(watch->map) ? "*" : " ",
176 (void *)watch->map, (long)watch->loaddr,
177 (long)watch->hiaddr - (long)watch->loaddr);
180 /* Delete watchpoint */
183 db_deletewatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
186 db_delete_watchpoint(db_map_addr(addr), addr);
192 db_watchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
198 if (db_expression(&value))
199 size = (vm_size_t) value;
204 db_set_watchpoint(db_map_addr(addr), addr, size);
208 * At least one non-optional show-command must be implemented using
209 * DB_SHOW_COMMAND() so that db_show_cmd_set gets created. Here is one.
211 DB_SHOW_COMMAND(watches, db_listwatch_cmd)
213 db_list_watchpoints();
214 db_md_list_watchpoints();
218 db_set_watchpoints(void)
220 db_watchpoint_t watch;
222 if (!db_watchpoints_inserted) {
223 for (watch = db_watchpoint_list;
226 pmap_protect(watch->map->pmap,
227 trunc_page(watch->loaddr),
228 round_page(watch->hiaddr),
231 db_watchpoints_inserted = TRUE;
236 db_clear_watchpoints(void)
238 db_watchpoints_inserted = FALSE;
243 db_find_watchpoint(vm_map_t map, db_addr_t addr, db_regs_t *regs)
245 db_watchpoint_t watch;
246 db_watchpoint_t found = 0;
248 for (watch = db_watchpoint_list;
251 if (db_map_equal(watch->map, map)) {
252 if ((watch->loaddr <= addr) &&
253 (addr < watch->hiaddr))
255 else if ((trunc_page(watch->loaddr) <= addr) &&
256 (addr < round_page(watch->hiaddr)))
261 * We didn't hit exactly on a watchpoint, but we are
262 * in a protected region. We want to single-step
263 * and then re-protect.
267 db_watchpoints_inserted = FALSE;
268 db_single_step(regs);
277 /* Delete hardware watchpoint */
280 db_deletehwatch_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
288 rc = db_md_clr_watchpoint(addr, count);
290 db_printf("hardware watchpoint could not be deleted\n");
293 /* Set hardware watchpoint */
296 db_hwatchpoint_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
304 rc = db_md_set_watchpoint(addr, count);
306 db_printf("hardware watchpoint could not be set\n");