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