1 /* $NetBSD: db_variables.c,v 1.19 2000/07/05 16:29:25 jhawk 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 "AS IS" 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 <uvm/uvm_extern.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 #include <ddb/db_output.h> 47 48 49 /* 50 * If this is non-zero, the DDB will be entered when the system 51 * panics. Initialize it so that it's patchable. 52 */ 53 #ifndef DDB_ONPANIC 54 #define DDB_ONPANIC 1 55 #endif 56 int db_onpanic = DDB_ONPANIC; 57 58 /* 59 * Can DDB can be entered from the console? 60 */ 61 #ifndef DDB_FROMCONSOLE 62 #define DDB_FROMCONSOLE 1 63 #endif 64 int db_fromconsole = DDB_FROMCONSOLE; 65 66 67 static int db_rw_internal_variable __P((struct db_variable *, db_expr_t *, 68 int)); 69 70 /* XXX must all be ints for sysctl. */ 71 struct db_variable db_vars[] = { 72 { "radix", (long *)&db_radix, db_rw_internal_variable }, 73 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 74 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 75 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 76 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 77 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 78 { "fromconsole", (long *)&db_onpanic, db_rw_internal_variable }, 79 }; 80 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 81 82 /* 83 * ddb command line access to the DDB variables defined above. 84 */ 85 static int 86 db_rw_internal_variable(vp, valp, rw) 87 struct db_variable *vp; 88 db_expr_t *valp; 89 int rw; 90 { 91 92 if (rw == DB_VAR_GET) { 93 *valp = *(int *)vp->valuep; 94 } else { 95 *(int *)vp->valuep = *valp; 96 } 97 return (0); 98 } 99 100 /* 101 * sysctl(3) access to the DDB variables defined above. 102 */ 103 int 104 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 105 int *name; 106 u_int namelen; 107 void *oldp; 108 size_t *oldlenp; 109 void *newp; 110 size_t newlen; 111 struct proc *p; 112 { 113 114 /* All sysctl names at this level are terminal. */ 115 if (namelen != 1) 116 return (ENOTDIR); 117 118 switch (name[0]) { 119 case DDBCTL_RADIX: 120 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 121 122 case DDBCTL_MAXOFF: 123 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 124 125 case DDBCTL_MAXWIDTH: 126 return (sysctl_int(oldp, oldlenp, newp, newlen, 127 &db_max_width)); 128 129 case DDBCTL_TABSTOPS: 130 return (sysctl_int(oldp, oldlenp, newp, newlen, 131 &db_tab_stop_width)); 132 133 case DDBCTL_LINES: 134 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 135 136 case DDBCTL_ONPANIC: 137 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 138 case DDBCTL_FROMCONSOLE: 139 return (sysctl_int(oldp, oldlenp, newp, newlen, 140 &db_fromconsole)); 141 } 142 143 return (EOPNOTSUPP); 144 } 145 146 int 147 db_find_variable(varp) 148 struct db_variable **varp; 149 { 150 int t; 151 struct db_variable *vp; 152 153 t = db_read_token(); 154 if (t == tIDENT) { 155 for (vp = db_vars; vp < db_evars; vp++) { 156 if (!strcmp(db_tok_string, vp->name)) { 157 *varp = vp; 158 return (1); 159 } 160 } 161 for (vp = db_regs; vp < db_eregs; vp++) { 162 if (!strcmp(db_tok_string, vp->name)) { 163 *varp = vp; 164 return (1); 165 } 166 } 167 } 168 db_error("Unknown variable\n"); 169 /*NOTREACHED*/ 170 return 0; 171 } 172 173 int 174 db_get_variable(valuep) 175 db_expr_t *valuep; 176 { 177 struct db_variable *vp; 178 179 if (!db_find_variable(&vp)) 180 return (0); 181 182 db_read_variable(vp, valuep); 183 184 return (1); 185 } 186 187 int 188 db_set_variable(value) 189 db_expr_t value; 190 { 191 struct db_variable *vp; 192 193 if (!db_find_variable(&vp)) 194 return (0); 195 196 db_write_variable(vp, &value); 197 198 return (1); 199 } 200 201 202 void 203 db_read_variable(vp, valuep) 204 struct db_variable *vp; 205 db_expr_t *valuep; 206 { 207 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 208 209 if (func == FCN_NULL) 210 *valuep = *(vp->valuep); 211 else 212 (*func)(vp, valuep, DB_VAR_GET); 213 } 214 215 void 216 db_write_variable(vp, valuep) 217 struct db_variable *vp; 218 db_expr_t *valuep; 219 { 220 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 221 222 if (func == FCN_NULL) 223 *(vp->valuep) = *valuep; 224 else 225 (*func)(vp, valuep, DB_VAR_SET); 226 } 227 228 /*ARGSUSED*/ 229 void 230 db_set_cmd(addr, have_addr, count, modif) 231 db_expr_t addr; 232 int have_addr; 233 db_expr_t count; 234 char * modif; 235 { 236 db_expr_t value; 237 db_expr_t old_value; 238 struct db_variable *vp; 239 int t; 240 241 t = db_read_token(); 242 if (t != tDOLLAR) { 243 db_error("Unknown variable\n"); 244 /*NOTREACHED*/ 245 } 246 if (!db_find_variable(&vp)) { 247 db_error("Unknown variable\n"); 248 /*NOTREACHED*/ 249 } 250 251 t = db_read_token(); 252 if (t != tEQ) 253 db_unread_token(t); 254 255 if (!db_expression(&value)) { 256 db_error("No value\n"); 257 /*NOTREACHED*/ 258 } 259 if (db_read_token() != tEOL) { 260 db_error("?\n"); 261 /*NOTREACHED*/ 262 } 263 264 db_read_variable(vp, &old_value); 265 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 266 db_printf("%s\n", db_num_to_str(value)); 267 db_write_variable(vp, &value); 268 } 269