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 } 172