1 /* $NetBSD: db_variables.c,v 1.14 1998/10/29 21:22:33 jonathan 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 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 "opt_ddb.h" /* for sysctl.h */ 30 #include "opt_ddbparam.h" 31 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <vm/vm.h> 35 #include <sys/sysctl.h> 36 37 #include <machine/db_machdep.h> 38 39 #include <ddb/ddbvar.h> 40 41 #include <ddb/db_lex.h> 42 #include <ddb/db_variables.h> 43 #include <ddb/db_command.h> 44 #include <ddb/db_sym.h> 45 #include <ddb/db_extern.h> 46 47 48 /* 49 * If this is non-zero, the DDB will be entered when the system 50 * panics. Initialize it so that it's patchable. 51 */ 52 #ifndef DDB_ONPANIC 53 #define DDB_ONPANIC 1 54 #endif 55 int db_onpanic = DDB_ONPANIC; 56 57 /* 58 * Can DDB can be entered from the console? 59 */ 60 #ifndef DDB_FROMCONSOLE 61 #define DDB_FROMCONSOLE 1 62 #endif 63 int db_fromconsole = DDB_FROMCONSOLE; 64 65 66 extern int db_radix; 67 extern int db_max_width; 68 extern int db_tab_stop_width; 69 extern int db_max_line; 70 71 static int db_rw_internal_variable __P((struct db_variable *, db_expr_t *, 72 int)); 73 74 /* XXX must all be ints for sysctl. */ 75 struct db_variable db_vars[] = { 76 { "radix", (long *)&db_radix, db_rw_internal_variable }, 77 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 78 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 79 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 80 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 81 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 82 { "fromconsole", (long *)&db_onpanic, db_rw_internal_variable }, 83 }; 84 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 85 86 /* 87 * ddb command line access to the DDB variables defined above. 88 */ 89 static int 90 db_rw_internal_variable(vp, valp, rw) 91 struct db_variable *vp; 92 db_expr_t *valp; 93 int rw; 94 { 95 96 if (rw == DB_VAR_GET) { 97 *valp = *(int *)vp->valuep; 98 } else { 99 *(int *)vp->valuep = *valp; 100 } 101 return (0); 102 } 103 104 /* 105 * sysctl(3) access to the DDB variables defined above. 106 */ 107 int 108 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 109 int *name; 110 u_int namelen; 111 void *oldp; 112 size_t *oldlenp; 113 void *newp; 114 size_t newlen; 115 struct proc *p; 116 { 117 118 /* All sysctl names at this level are terminal. */ 119 if (namelen != 1) 120 return (ENOTDIR); 121 122 switch (name[0]) { 123 case DDBCTL_RADIX: 124 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 125 126 case DDBCTL_MAXOFF: 127 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 128 129 case DDBCTL_MAXWIDTH: 130 return (sysctl_int(oldp, oldlenp, newp, newlen, 131 &db_max_width)); 132 133 case DDBCTL_TABSTOPS: 134 return (sysctl_int(oldp, oldlenp, newp, newlen, 135 &db_tab_stop_width)); 136 137 case DDBCTL_LINES: 138 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 139 140 case DDBCTL_ONPANIC: 141 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 142 case DDBCTL_FROMCONSOLE: 143 return (sysctl_int(oldp, oldlenp, newp, newlen, 144 &db_fromconsole)); 145 } 146 147 return (EOPNOTSUPP); 148 } 149 150 int 151 db_find_variable(varp) 152 struct db_variable **varp; 153 { 154 int t; 155 struct db_variable *vp; 156 157 t = db_read_token(); 158 if (t == tIDENT) { 159 for (vp = db_vars; vp < db_evars; vp++) { 160 if (!strcmp(db_tok_string, vp->name)) { 161 *varp = vp; 162 return (1); 163 } 164 } 165 for (vp = db_regs; vp < db_eregs; vp++) { 166 if (!strcmp(db_tok_string, vp->name)) { 167 *varp = vp; 168 return (1); 169 } 170 } 171 } 172 db_error("Unknown variable\n"); 173 /*NOTREACHED*/ 174 return 0; 175 } 176 177 int 178 db_get_variable(valuep) 179 db_expr_t *valuep; 180 { 181 struct db_variable *vp; 182 183 if (!db_find_variable(&vp)) 184 return (0); 185 186 db_read_variable(vp, valuep); 187 188 return (1); 189 } 190 191 int 192 db_set_variable(value) 193 db_expr_t value; 194 { 195 struct db_variable *vp; 196 197 if (!db_find_variable(&vp)) 198 return (0); 199 200 db_write_variable(vp, &value); 201 202 return (1); 203 } 204 205 206 void 207 db_read_variable(vp, valuep) 208 struct db_variable *vp; 209 db_expr_t *valuep; 210 { 211 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 212 213 if (func == FCN_NULL) 214 *valuep = *(vp->valuep); 215 else 216 (*func)(vp, valuep, DB_VAR_GET); 217 } 218 219 void 220 db_write_variable(vp, valuep) 221 struct db_variable *vp; 222 db_expr_t *valuep; 223 { 224 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 225 226 if (func == FCN_NULL) 227 *(vp->valuep) = *valuep; 228 else 229 (*func)(vp, valuep, DB_VAR_SET); 230 } 231 232 /*ARGSUSED*/ 233 void 234 db_set_cmd(addr, have_addr, count, modif) 235 db_expr_t addr; 236 int have_addr; 237 db_expr_t count; 238 char * modif; 239 { 240 db_expr_t value; 241 struct db_variable *vp; 242 int t; 243 244 t = db_read_token(); 245 if (t != tDOLLAR) { 246 db_error("Unknown variable\n"); 247 /*NOTREACHED*/ 248 } 249 if (!db_find_variable(&vp)) { 250 db_error("Unknown variable\n"); 251 /*NOTREACHED*/ 252 } 253 254 t = db_read_token(); 255 if (t != tEQ) 256 db_unread_token(t); 257 258 if (!db_expression(&value)) { 259 db_error("No value\n"); 260 /*NOTREACHED*/ 261 } 262 if (db_read_token() != tEOL) { 263 db_error("?\n"); 264 /*NOTREACHED*/ 265 } 266 267 db_write_variable(vp, &value); 268 } 269