1 /* $OpenBSD: db_variables.c,v 1.13 2011/04/05 19:54:35 jasper Exp $ */ 2 /* $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/proc.h> 32 33 #include <uvm/uvm_extern.h> 34 35 #include <machine/db_machdep.h> 36 37 #include <ddb/db_lex.h> 38 #include <ddb/db_variables.h> 39 #include <ddb/db_command.h> 40 #include <ddb/db_sym.h> 41 #include <ddb/db_extern.h> 42 #include <ddb/db_var.h> 43 44 struct db_variable db_vars[] = { 45 { "radix", (long *)&db_radix, db_var_rw_int }, 46 { "maxoff", (long *)&db_maxoff, db_var_rw_int }, 47 { "maxwidth", (long *)&db_max_width, db_var_rw_int }, 48 { "tabstops", (long *)&db_tab_stop_width, db_var_rw_int }, 49 { "lines", (long *)&db_max_line, db_var_rw_int }, 50 { "log", (long *)&db_log, db_var_rw_int } 51 }; 52 struct db_variable *db_evars = db_vars + nitems(db_vars); 53 54 int 55 db_find_variable(struct db_variable **varp) 56 { 57 int t; 58 struct db_variable *vp; 59 60 t = db_read_token(); 61 if (t == tIDENT) { 62 for (vp = db_vars; vp < db_evars; vp++) { 63 if (!strcmp(db_tok_string, vp->name)) { 64 *varp = vp; 65 return (1); 66 } 67 } 68 for (vp = db_regs; vp < db_eregs; vp++) { 69 if (!strcmp(db_tok_string, vp->name)) { 70 *varp = vp; 71 return (1); 72 } 73 } 74 } 75 db_error("Unknown variable\n"); 76 /*NOTREACHED*/ 77 return 0; 78 } 79 80 int 81 db_get_variable(db_expr_t *valuep) 82 { 83 struct db_variable *vp; 84 85 if (!db_find_variable(&vp)) 86 return (0); 87 88 db_read_variable(vp, valuep); 89 90 return (1); 91 } 92 93 int 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 db_write_variable(vp, &value); 102 103 return (1); 104 } 105 106 107 void 108 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 109 { 110 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 111 112 if (func == FCN_NULL) 113 *valuep = *(vp->valuep); 114 else 115 (*func)(vp, valuep, DB_VAR_GET); 116 } 117 118 void 119 db_write_variable(struct db_variable *vp, db_expr_t *valuep) 120 { 121 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 122 123 if (func == FCN_NULL) 124 *(vp->valuep) = *valuep; 125 else 126 (*func)(vp, valuep, DB_VAR_SET); 127 } 128 129 /*ARGSUSED*/ 130 void 131 db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 132 { 133 db_expr_t value; 134 struct db_variable *vp; 135 int t; 136 137 t = db_read_token(); 138 if (t != tDOLLAR) { 139 db_error("Unknown variable\n"); 140 /*NOTREACHED*/ 141 } 142 if (!db_find_variable(&vp)) { 143 db_error("Unknown variable\n"); 144 /*NOTREACHED*/ 145 } 146 147 t = db_read_token(); 148 if (t != tEQ) 149 db_unread_token(t); 150 151 if (!db_expression(&value)) { 152 db_error("No value\n"); 153 /*NOTREACHED*/ 154 } 155 if (db_read_token() != tEOL) { 156 db_error("?\n"); 157 /*NOTREACHED*/ 158 } 159 160 db_write_variable(vp, &value); 161 } 162 163 int 164 db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode) 165 { 166 167 if (mode == DB_VAR_SET) 168 *var->valuep = *(int *)expr; 169 else 170 *expr = *(int *)var->valuep; 171 return (0); 172 } 173 174