1 /* $NetBSD: db_variables.c,v 1.39.54.2 2009/03/12 23:26:22 snj Exp $ */
2
3 /*
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.39.54.2 2009/03/12 23:26:22 snj Exp $");
31
32 #include "opt_ddbparam.h"
33
34 #include <sys/param.h>
35 #include <sys/proc.h>
36 #include <uvm/uvm_extern.h>
37 #include <sys/sysctl.h>
38
39 #include <machine/db_machdep.h>
40
41 #include <ddb/ddbvar.h>
42
43 #include <ddb/db_lex.h>
44 #include <ddb/db_variables.h>
45 #include <ddb/db_command.h>
46 #include <ddb/db_sym.h>
47 #include <ddb/db_extern.h>
48 #include <ddb/db_output.h>
49
50
51 /*
52 * If this is non-zero, the DDB will be entered when the system
53 * panics. Initialize it so that it's patchable.
54 */
55 #ifndef DDB_ONPANIC
56 #define DDB_ONPANIC 1
57 #endif
58 int db_onpanic = DDB_ONPANIC;
59
60 /*
61 * Can DDB can be entered from the console?
62 */
63 #ifndef DDB_FROMCONSOLE
64 #define DDB_FROMCONSOLE 1
65 #endif
66 int db_fromconsole = DDB_FROMCONSOLE;
67
68 /*
69 * Output DDB output to the message buffer?
70 */
71 #ifndef DDB_TEE_MSGBUF
72 #define DDB_TEE_MSGBUF 0
73 #endif
74 int db_tee_msgbuf = DDB_TEE_MSGBUF;
75
76
77 static int db_rw_internal_variable(const struct db_variable *, db_expr_t *,
78 int);
79 static int db_find_variable(const struct db_variable **);
80
81 /* XXX must all be ints for sysctl. */
82 const struct db_variable db_vars[] = {
83 { "radix", (void *)&db_radix, db_rw_internal_variable, NULL },
84 { "maxoff", (void *)&db_maxoff, db_rw_internal_variable, NULL },
85 { "maxwidth", (void *)&db_max_width, db_rw_internal_variable, NULL },
86 { "tabstops", (void *)&db_tab_stop_width, db_rw_internal_variable, NULL },
87 { "lines", (void *)&db_max_line, db_rw_internal_variable, NULL },
88 { "onpanic", (void *)&db_onpanic, db_rw_internal_variable, NULL },
89 { "fromconsole", (void *)&db_fromconsole, db_rw_internal_variable, NULL },
90 { "tee_msgbuf", (void *)&db_tee_msgbuf, db_rw_internal_variable, NULL },
91 };
92 const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
93
94 /*
95 * ddb command line access to the DDB variables defined above.
96 */
97 static int
98 db_rw_internal_variable(const struct db_variable *vp, db_expr_t *valp, int rw)
99 {
100
101 if (rw == DB_VAR_GET)
102 *valp = *(int *)vp->valuep;
103 else
104 *(int *)vp->valuep = *valp;
105 return (0);
106 }
107
108 /*
109 * sysctl(3) access to the DDB variables defined above.
110 */
111 SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup")
112 {
113
114 sysctl_createv(clog, 0, NULL, NULL,
115 CTLFLAG_PERMANENT,
116 CTLTYPE_NODE, "ddb", NULL,
117 NULL, 0, NULL, 0,
118 CTL_DDB, CTL_EOL);
119
120 sysctl_createv(clog, 0, NULL, NULL,
121 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
122 CTLTYPE_INT, "radix",
123 SYSCTL_DESCR("Input and output radix"),
124 NULL, 0, &db_radix, 0,
125 CTL_DDB, DDBCTL_RADIX, CTL_EOL);
126 sysctl_createv(clog, 0, NULL, NULL,
127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
128 CTLTYPE_INT, "maxoff",
129 SYSCTL_DESCR("Maximum symbol offset"),
130 NULL, 0, &db_maxoff, 0,
131 CTL_DDB, DDBCTL_MAXOFF, CTL_EOL);
132 sysctl_createv(clog, 0, NULL, NULL,
133 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
134 CTLTYPE_INT, "maxwidth",
135 SYSCTL_DESCR("Maximum output line width"),
136 NULL, 0, &db_max_width, 0,
137 CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL);
138 sysctl_createv(clog, 0, NULL, NULL,
139 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
140 CTLTYPE_INT, "lines",
141 SYSCTL_DESCR("Number of display lines"),
142 NULL, 0, &db_max_line, 0,
143 CTL_DDB, DDBCTL_LINES, CTL_EOL);
144 sysctl_createv(clog, 0, NULL, NULL,
145 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
146 CTLTYPE_INT, "tabstops",
147 SYSCTL_DESCR("Output tab width"),
148 NULL, 0, &db_tab_stop_width, 0,
149 CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL);
150 sysctl_createv(clog, 0, NULL, NULL,
151 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
152 CTLTYPE_INT, "onpanic",
153 SYSCTL_DESCR("Whether to enter ddb on a kernel panic"),
154 NULL, 0, &db_onpanic, 0,
155 CTL_DDB, DDBCTL_ONPANIC, CTL_EOL);
156 sysctl_createv(clog, 0, NULL, NULL,
157 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
158 CTLTYPE_INT, "fromconsole",
159 SYSCTL_DESCR("Whether ddb can be entered from the "
160 "console"),
161 NULL, 0, &db_fromconsole, 0,
162 CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL);
163 sysctl_createv(clog, 0, NULL, NULL,
164 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
165 CTLTYPE_INT, "tee_msgbuf",
166 SYSCTL_DESCR("Whether to tee ddb output to the msgbuf"),
167 NULL, 0, &db_tee_msgbuf, 0,
168 CTL_DDB, CTL_CREATE, CTL_EOL);
169
170 sysctl_createv(clog, 0, NULL, NULL,
171 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
172 CTLTYPE_STRING, "commandonenter",
173 SYSCTL_DESCR("Command to be executed on each ddb enter"),
174 NULL, 0, &db_cmd_on_enter, DB_LINE_MAXLEN,
175 CTL_DDB, CTL_CREATE, CTL_EOL);
176 }
177
178 int
179 db_find_variable(const struct db_variable **varp)
180 {
181 int t;
182 const struct db_variable *vp;
183
184 t = db_read_token();
185 if (t == tIDENT) {
186 for (vp = db_vars; vp < db_evars; vp++) {
187 if (!strcmp(db_tok_string, vp->name)) {
188 *varp = vp;
189 return (1);
190 }
191 }
192 for (vp = db_regs; vp < db_eregs; vp++) {
193 if (!strcmp(db_tok_string, vp->name)) {
194 *varp = vp;
195 return (1);
196 }
197 }
198 }
199 db_error("Unknown variable\n");
200 /*NOTREACHED*/
201 return 0;
202 }
203
204 int
205 db_get_variable(db_expr_t *valuep)
206 {
207 const struct db_variable *vp;
208
209 if (!db_find_variable(&vp))
210 return (0);
211
212 db_read_variable(vp, valuep);
213
214 return (1);
215 }
216
217 int
218 db_set_variable(db_expr_t value)
219 {
220 const struct db_variable *vp;
221
222 if (!db_find_variable(&vp))
223 return (0);
224
225 db_write_variable(vp, &value);
226
227 return (1);
228 }
229
230
231 void
232 db_read_variable(const struct db_variable *vp, db_expr_t *valuep)
233 {
234 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
235
236 if (func == FCN_NULL)
237 *valuep = *(vp->valuep);
238 else
239 (*func)(vp, valuep, DB_VAR_GET);
240 }
241
242 void
243 db_write_variable(const struct db_variable *vp, db_expr_t *valuep)
244 {
245 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
246
247 if (func == FCN_NULL)
248 *(vp->valuep) = *valuep;
249 else
250 (*func)(vp, valuep, DB_VAR_SET);
251 }
252
253 /*ARGSUSED*/
254 void
255 db_set_cmd(db_expr_t addr, bool have_addr,
256 db_expr_t count, const char *modif)
257 {
258 db_expr_t value;
259 db_expr_t old_value;
260 const struct db_variable *vp = NULL; /* XXX: GCC */
261 int t;
262
263 t = db_read_token();
264 if (t != tDOLLAR) {
265 db_error("Unknown variable\n");
266 /*NOTREACHED*/
267 }
268 if (!db_find_variable(&vp)) {
269 db_error("Unknown variable\n");
270 /*NOTREACHED*/
271 }
272
273 t = db_read_token();
274 if (t != tEQ)
275 db_unread_token(t);
276
277 if (!db_expression(&value)) {
278 db_error("No value\n");
279 /*NOTREACHED*/
280 }
281 if (db_read_token() != tEOL) {
282 db_error("?\n");
283 /*NOTREACHED*/
284 }
285
286 db_read_variable(vp, &old_value);
287 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value));
288 db_printf("%s\n", db_num_to_str(value));
289 db_write_variable(vp, &value);
290 }
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