1 /* $NetBSD: db_variables.c,v 1.12 1998/01/31 04:14:48 ross 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 <sys/param.h> 30 #include <sys/proc.h> 31 #include <vm/vm.h> 32 #include <sys/sysctl.h> 33 34 #include <machine/db_machdep.h> 35 36 #include <ddb/db_lex.h> 37 #include <ddb/db_variables.h> 38 #include <ddb/db_command.h> 39 #include <ddb/db_sym.h> 40 #include <ddb/db_extern.h> 41 42 /* 43 * If this is non-zero, the DDB will be entered when the system 44 * panics. Initialize it so that it's patchable. 45 */ 46 #ifndef DDB_ONPANIC 47 #define DDB_ONPANIC 1 48 #endif 49 int db_onpanic = DDB_ONPANIC; 50 51 extern int db_radix; 52 extern int db_max_width; 53 extern int db_tab_stop_width; 54 extern int db_max_line; 55 56 static int db_rw_internal_variable __P((struct db_variable *, db_expr_t *, 57 int)); 58 59 /* XXX must all be ints for sysctl. */ 60 struct db_variable db_vars[] = { 61 { "radix", (long *)&db_radix, db_rw_internal_variable }, 62 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 63 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 64 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 65 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 66 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 67 }; 68 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 69 70 /* 71 * ddb command line access to the DDB variables defined above. 72 */ 73 static int 74 db_rw_internal_variable(vp, valp, rw) 75 struct db_variable *vp; 76 db_expr_t *valp; 77 int rw; 78 { 79 80 if (rw == DB_VAR_GET) { 81 *valp = *(int *)vp->valuep; 82 } else { 83 *(int *)vp->valuep = *valp; 84 } 85 return (0); 86 } 87 88 /* 89 * sysctl(3) access to the DDB variables defined above. 90 */ 91 int 92 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 93 int *name; 94 u_int namelen; 95 void *oldp; 96 size_t *oldlenp; 97 void *newp; 98 size_t newlen; 99 struct proc *p; 100 { 101 102 /* All sysctl names at this level are terminal. */ 103 if (namelen != 1) 104 return (ENOTDIR); 105 106 switch (name[0]) { 107 case DDBCTL_RADIX: 108 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 109 110 case DDBCTL_MAXOFF: 111 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 112 113 case DDBCTL_MAXWIDTH: 114 return (sysctl_int(oldp, oldlenp, newp, newlen, 115 &db_max_width)); 116 117 case DDBCTL_TABSTOPS: 118 return (sysctl_int(oldp, oldlenp, newp, newlen, 119 &db_tab_stop_width)); 120 121 case DDBCTL_LINES: 122 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 123 124 case DDBCTL_ONPANIC: 125 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 126 } 127 128 return (EOPNOTSUPP); 129 } 130 131 int 132 db_find_variable(varp) 133 struct db_variable **varp; 134 { 135 int t; 136 struct db_variable *vp; 137 138 t = db_read_token(); 139 if (t == tIDENT) { 140 for (vp = db_vars; vp < db_evars; vp++) { 141 if (!strcmp(db_tok_string, vp->name)) { 142 *varp = vp; 143 return (1); 144 } 145 } 146 for (vp = db_regs; vp < db_eregs; vp++) { 147 if (!strcmp(db_tok_string, vp->name)) { 148 *varp = vp; 149 return (1); 150 } 151 } 152 } 153 db_error("Unknown variable\n"); 154 /*NOTREACHED*/ 155 return 0; 156 } 157 158 int 159 db_get_variable(valuep) 160 db_expr_t *valuep; 161 { 162 struct db_variable *vp; 163 164 if (!db_find_variable(&vp)) 165 return (0); 166 167 db_read_variable(vp, valuep); 168 169 return (1); 170 } 171 172 int 173 db_set_variable(value) 174 db_expr_t value; 175 { 176 struct db_variable *vp; 177 178 if (!db_find_variable(&vp)) 179 return (0); 180 181 db_write_variable(vp, &value); 182 183 return (1); 184 } 185 186 187 void 188 db_read_variable(vp, valuep) 189 struct db_variable *vp; 190 db_expr_t *valuep; 191 { 192 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 193 194 if (func == FCN_NULL) 195 *valuep = *(vp->valuep); 196 else 197 (*func)(vp, valuep, DB_VAR_GET); 198 } 199 200 void 201 db_write_variable(vp, valuep) 202 struct db_variable *vp; 203 db_expr_t *valuep; 204 { 205 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 206 207 if (func == FCN_NULL) 208 *(vp->valuep) = *valuep; 209 else 210 (*func)(vp, valuep, DB_VAR_SET); 211 } 212 213 /*ARGSUSED*/ 214 void 215 db_set_cmd(addr, have_addr, count, modif) 216 db_expr_t addr; 217 int have_addr; 218 db_expr_t count; 219 char * modif; 220 { 221 db_expr_t value; 222 struct db_variable *vp; 223 int t; 224 225 t = db_read_token(); 226 if (t != tDOLLAR) { 227 db_error("Unknown variable\n"); 228 /*NOTREACHED*/ 229 } 230 if (!db_find_variable(&vp)) { 231 db_error("Unknown variable\n"); 232 /*NOTREACHED*/ 233 } 234 235 t = db_read_token(); 236 if (t != tEQ) 237 db_unread_token(t); 238 239 if (!db_expression(&value)) { 240 db_error("No value\n"); 241 /*NOTREACHED*/ 242 } 243 if (db_read_token() != tEOL) { 244 db_error("?\n"); 245 /*NOTREACHED*/ 246 } 247 248 db_write_variable(vp, &value); 249 } 250