Collapse gd_astpending and gd_reqpri together into gd_reqflags. gd_reqflags
[dragonfly.git] / 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 * $FreeBSD: src/sys/ddb/db_watch.c,v 1.20.2.1 2001/07/25 01:00:08 bsd Exp $
1de703da 27 * $DragonFly: src/sys/ddb/db_watch.c,v 1.2 2003/06/17 04:28:20 dillon Exp $
984263bc
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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
50static boolean_t db_watchpoints_inserted = TRUE;
51
52#define NWATCHPOINTS 100
53static struct db_watchpoint db_watch_table[NWATCHPOINTS];
54static db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
55static db_watchpoint_t db_free_watchpoints = 0;
56static db_watchpoint_t db_watchpoint_list = 0;
57
58static db_watchpoint_t db_watchpoint_alloc __P((void));
59static void db_watchpoint_free __P((db_watchpoint_t watch));
60static void db_delete_watchpoint __P((vm_map_t map,
61 db_addr_t addr));
62#ifdef notused
63static boolean_t db_find_watchpoint __P((vm_map_t map, db_addr_t addr,
64 db_regs_t *regs));
65#endif
66static void db_list_watchpoints __P((void));
67static void db_set_watchpoint __P((vm_map_t map, db_addr_t addr,
68 vm_size_t size));
69
70int db_md_set_watchpoint __P((db_expr_t addr, db_expr_t size));
71int db_md_clr_watchpoint __P((db_expr_t addr, db_expr_t size));
72void db_md_list_watchpoints __P((void));
73
74
75db_watchpoint_t
76db_watchpoint_alloc()
77{
78 register 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
94void
95db_watchpoint_free(watch)
96 register db_watchpoint_t watch;
97{
98 watch->link = db_free_watchpoints;
99 db_free_watchpoints = watch;
100}
101
102static void
103db_set_watchpoint(map, addr, size)
104 vm_map_t map;
105 db_addr_t addr;
106 vm_size_t size;
107{
108 register db_watchpoint_t watch;
109
110 if (map == NULL) {
111 db_printf("No map.\n");
112 return;
113 }
114
115 /*
116 * Should we do anything fancy with overlapping regions?
117 */
118
119 for (watch = db_watchpoint_list;
120 watch != 0;
121 watch = watch->link)
122 if (db_map_equal(watch->map, map) &&
123 (watch->loaddr == addr) &&
124 (watch->hiaddr == addr+size)) {
125 db_printf("Already set.\n");
126 return;
127 }
128
129 watch = db_watchpoint_alloc();
130 if (watch == 0) {
131 db_printf("Too many watchpoints.\n");
132 return;
133 }
134
135 watch->map = map;
136 watch->loaddr = addr;
137 watch->hiaddr = addr+size;
138
139 watch->link = db_watchpoint_list;
140 db_watchpoint_list = watch;
141
142 db_watchpoints_inserted = FALSE;
143}
144
145static void
146db_delete_watchpoint(map, addr)
147 vm_map_t map;
148 db_addr_t addr;
149{
150 register db_watchpoint_t watch;
151 register db_watchpoint_t *prev;
152
153 for (prev = &db_watchpoint_list;
154 (watch = *prev) != 0;
155 prev = &watch->link)
156 if (db_map_equal(watch->map, map) &&
157 (watch->loaddr <= addr) &&
158 (addr < watch->hiaddr)) {
159 *prev = watch->link;
160 db_watchpoint_free(watch);
161 return;
162 }
163
164 db_printf("Not set.\n");
165}
166
167static void
168db_list_watchpoints()
169{
170 register db_watchpoint_t watch;
171
172 if (db_watchpoint_list == 0) {
173 db_printf("No watchpoints set\n");
174 return;
175 }
176
177 db_printf(" Map Address Size\n");
178 for (watch = db_watchpoint_list;
179 watch != 0;
180 watch = watch->link)
181 db_printf("%s%8p %8lx %lx\n",
182 db_map_current(watch->map) ? "*" : " ",
183 (void *)watch->map, (long)watch->loaddr,
184 (long)watch->hiaddr - (long)watch->loaddr);
185}
186
187/* Delete watchpoint */
188/*ARGSUSED*/
189void
190db_deletewatch_cmd(addr, have_addr, count, modif)
191 db_expr_t addr;
192 boolean_t have_addr;
193 db_expr_t count;
194 char * modif;
195{
196 db_delete_watchpoint(db_map_addr(addr), addr);
197}
198
199/* Set watchpoint */
200/*ARGSUSED*/
201void
202db_watchpoint_cmd(addr, have_addr, count, modif)
203 db_expr_t addr;
204 boolean_t have_addr;
205 db_expr_t count;
206 char * modif;
207{
208 vm_size_t size;
209 db_expr_t value;
210
211 if (db_expression(&value))
212 size = (vm_size_t) value;
213 else
214 size = 4;
215 db_skip_to_eol();
216
217 db_set_watchpoint(db_map_addr(addr), addr, size);
218}
219
220/*
221 * At least one non-optional show-command must be implemented using
222 * DB_SHOW_COMMAND() so that db_show_cmd_set gets created. Here is one.
223 */
224DB_SHOW_COMMAND(watches, db_listwatch_cmd)
225{
226 db_list_watchpoints();
227 db_md_list_watchpoints();
228}
229
230void
231db_set_watchpoints()
232{
233 register db_watchpoint_t watch;
234
235 if (!db_watchpoints_inserted) {
236 for (watch = db_watchpoint_list;
237 watch != 0;
238 watch = watch->link)
239 pmap_protect(watch->map->pmap,
240 trunc_page(watch->loaddr),
241 round_page(watch->hiaddr),
242 VM_PROT_READ);
243
244 db_watchpoints_inserted = TRUE;
245 }
246}
247
248void
249db_clear_watchpoints()
250{
251 db_watchpoints_inserted = FALSE;
252}
253
254#ifdef notused
255static boolean_t
256db_find_watchpoint(map, addr, regs)
257 vm_map_t map;
258 db_addr_t addr;
259 db_regs_t *regs;
260{
261 register db_watchpoint_t watch;
262 db_watchpoint_t found = 0;
263
264 for (watch = db_watchpoint_list;
265 watch != 0;
266 watch = watch->link)
267 if (db_map_equal(watch->map, map)) {
268 if ((watch->loaddr <= addr) &&
269 (addr < watch->hiaddr))
270 return (TRUE);
271 else if ((trunc_page(watch->loaddr) <= addr) &&
272 (addr < round_page(watch->hiaddr)))
273 found = watch;
274 }
275
276 /*
277 * We didn't hit exactly on a watchpoint, but we are
278 * in a protected region. We want to single-step
279 * and then re-protect.
280 */
281
282 if (found) {
283 db_watchpoints_inserted = FALSE;
284 db_single_step(regs);
285 }
286
287 return (FALSE);
288}
289#endif
290
291
292
293/* Delete hardware watchpoint */
294/*ARGSUSED*/
295void
296db_deletehwatch_cmd(addr, have_addr, count, modif)
297 db_expr_t addr;
298 boolean_t have_addr;
299 db_expr_t count;
300 char * modif;
301{
302 int rc;
303
304 if (count < 0)
305 count = 4;
306
307 rc = db_md_clr_watchpoint(addr, count);
308 if (rc < 0)
309 db_printf("hardware watchpoint could not be deleted\n");
310}
311
312/* Set hardware watchpoint */
313/*ARGSUSED*/
314void
315db_hwatchpoint_cmd(addr, have_addr, count, modif)
316 db_expr_t addr;
317 boolean_t have_addr;
318 db_expr_t count;
319 char * modif;
320{
321 int rc;
322
323 if (count < 0)
324 count = 4;
325
326 rc = db_md_set_watchpoint(addr, count);
327 if (rc < 0)
328 db_printf("hardware watchpoint could not be set\n");
329}