1 /*-
2 * SPDX-License-Identifier: MIT-CMU
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
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 * Author: David B. Golub, Carnegie Mellon University
30 * Date: 7/90
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38
39 #include <ddb/ddb.h>
40 #include <ddb/db_lex.h>
41 #include <ddb/db_variables.h>
42
43 static int db_find_variable(struct db_variable **varp);
44
45 static struct db_variable db_vars[] = {
46 { "radix", &db_radix, FCN_NULL },
47 { "maxoff", &db_maxoff, FCN_NULL },
48 { "maxwidth", &db_max_width, FCN_NULL },
49 { "tabstops", &db_tab_stop_width, FCN_NULL },
50 { "lines", &db_lines_per_page, FCN_NULL },
51 { "curcpu", NULL, db_var_curcpu },
52 { "db_cpu", NULL, db_var_db_cpu },
53 #ifdef VIMAGE
54 { "curvnet", NULL, db_var_curvnet },
55 { "db_vnet", NULL, db_var_db_vnet },
56 #endif
57 };
58 static struct db_variable *db_evars = db_vars + nitems(db_vars);
59
60 static int
61 db_find_variable(struct db_variable **varp)
62 {
63 struct db_variable *vp;
64 int t;
65
66 t = db_read_token();
67 if (t == tIDENT) {
68 for (vp = db_vars; vp < db_evars; vp++) {
69 if (!strcmp(db_tok_string, vp->name)) {
70 *varp = vp;
71 return (1);
72 }
73 }
74 for (vp = db_regs; vp < db_eregs; vp++) {
75 if (!strcmp(db_tok_string, vp->name)) {
76 *varp = vp;
77 return (1);
78 }
79 }
80 }
81 db_error("Unknown variable\n");
82 return (0);
83 }
84
85 int
86 db_get_variable(db_expr_t *valuep)
87 {
88 struct db_variable *vp;
89
90 if (!db_find_variable(&vp))
91 return (0);
92
93 return (db_read_variable(vp, valuep));
94 }
95
96 int
97 db_set_variable(db_expr_t value)
98 {
99 struct db_variable *vp;
100
101 if (!db_find_variable(&vp))
102 return (0);
103
104 return (db_write_variable(vp, value));
105 }
106
107 int
108 db_read_variable(struct db_variable *vp, db_expr_t *valuep)
109 {
110 db_varfcn_t *func = vp->fcn;
111
112 if (func == FCN_NULL) {
113 *valuep = *(vp->valuep);
114 return (1);
115 }
116 return ((*func)(vp, valuep, DB_VAR_GET));
117 }
118
119 int
120 db_write_variable(struct db_variable *vp, db_expr_t value)
121 {
122 db_varfcn_t *func = vp->fcn;
123
124 if (func == FCN_NULL) {
125 *(vp->valuep) = value;
126 return (1);
127 }
128 return ((*func)(vp, &value, DB_VAR_SET));
129 }
130
131 void
132 db_set_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
133 {
134 struct db_variable *vp;
135 db_expr_t value;
136 int t;
137
138 t = db_read_token();
139 if (t == tEOL) {
140 for (vp = db_vars; vp < db_evars; vp++) {
141 if (!db_read_variable(vp, &value)) {
142 db_printf("$%s\n", vp->name);
143 continue;
144 }
145 db_printf("$%-8s = %ld\n",
146 vp->name, (unsigned long)value);
147 }
148 return;
149 }
150 if (t != tDOLLAR) {
151 db_error("Unknown variable\n");
152 return;
153 }
154 if (!db_find_variable(&vp)) {
155 db_error("Unknown variable\n");
156 return;
157 }
158
159 t = db_read_token();
160 if (t != tEQ)
161 db_unread_token(t);
162
163 if (!db_expression(&value)) {
164 db_error("No value\n");
165 return;
166 }
167 if (db_read_token() != tEOL)
168 db_error("?\n");
169
170 db_write_variable(vp, value);
171 }
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