1 /* $NetBSD: db_variables.c,v 1.23 2001/11/20 08:43:44 lukem 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 <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.23 2001/11/20 08:43:44 lukem Exp $"); 31 32 #include "opt_ddb.h" 33 34 #include <sys/param.h> 35 #include <sys/proc.h> 36 #include <uvm/uvm_extern.h> 37 #include <sys/sysctl.h> 38 39 #include <machine/db_machdep.h> 40 41 #include <ddb/ddbvar.h> 42 43 #include <ddb/db_lex.h> 44 #include <ddb/db_variables.h> 45 #include <ddb/db_command.h> 46 #include <ddb/db_sym.h> 47 #include <ddb/db_extern.h> 48 #include <ddb/db_output.h> 49 50 51 /* 52 * If this is non-zero, the DDB will be entered when the system 53 * panics. Initialize it so that it's patchable. 54 */ 55 #ifndef DDB_ONPANIC 56 #define DDB_ONPANIC 1 57 #endif 58 int db_onpanic = DDB_ONPANIC; 59 60 /* 61 * Can DDB can be entered from the console? 62 */ 63 #ifndef DDB_FROMCONSOLE 64 #define DDB_FROMCONSOLE 1 65 #endif 66 int db_fromconsole = DDB_FROMCONSOLE; 67 68 69 static int db_rw_internal_variable __P((const struct db_variable *, 70 db_expr_t *, int)); 71 72 /* XXX must all be ints for sysctl. */ 73 const struct db_variable db_vars[] = { 74 { "radix", (long *)&db_radix, db_rw_internal_variable }, 75 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 76 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 77 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 78 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 79 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 80 { "fromconsole", (long *)&db_fromconsole, db_rw_internal_variable }, 81 }; 82 const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 83 84 /* 85 * ddb command line access to the DDB variables defined above. 86 */ 87 static int 88 db_rw_internal_variable(vp, valp, rw) 89 const struct db_variable *vp; 90 db_expr_t *valp; 91 int rw; 92 { 93 94 if (rw == DB_VAR_GET) { 95 *valp = *(int *)vp->valuep; 96 } else { 97 *(int *)vp->valuep = *valp; 98 } 99 return (0); 100 } 101 102 /* 103 * sysctl(3) access to the DDB variables defined above. 104 */ 105 int 106 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 107 int *name; 108 u_int namelen; 109 void *oldp; 110 size_t *oldlenp; 111 void *newp; 112 size_t newlen; 113 struct proc *p; 114 { 115 116 /* All sysctl names at this level are terminal. */ 117 if (namelen != 1) 118 return (ENOTDIR); 119 120 switch (name[0]) { 121 case DDBCTL_RADIX: 122 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 123 124 case DDBCTL_MAXOFF: 125 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 126 127 case DDBCTL_MAXWIDTH: 128 return (sysctl_int(oldp, oldlenp, newp, newlen, 129 &db_max_width)); 130 131 case DDBCTL_TABSTOPS: 132 return (sysctl_int(oldp, oldlenp, newp, newlen, 133 &db_tab_stop_width)); 134 135 case DDBCTL_LINES: 136 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 137 138 case DDBCTL_ONPANIC: 139 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 140 case DDBCTL_FROMCONSOLE: 141 return (sysctl_int(oldp, oldlenp, newp, newlen, 142 &db_fromconsole)); 143 } 144 145 return (EOPNOTSUPP); 146 } 147 148 int 149 db_find_variable(varp) 150 const struct db_variable **varp; 151 { 152 int t; 153 const struct db_variable *vp; 154 155 t = db_read_token(); 156 if (t == tIDENT) { 157 for (vp = db_vars; vp < db_evars; vp++) { 158 if (!strcmp(db_tok_string, vp->name)) { 159 *varp = vp; 160 return (1); 161 } 162 } 163 for (vp = db_regs; vp < db_eregs; vp++) { 164 if (!strcmp(db_tok_string, vp->name)) { 165 *varp = vp; 166 return (1); 167 } 168 } 169 } 170 db_error("Unknown variable\n"); 171 /*NOTREACHED*/ 172 return 0; 173 } 174 175 int 176 db_get_variable(valuep) 177 db_expr_t *valuep; 178 { 179 const struct db_variable *vp; 180 181 if (!db_find_variable(&vp)) 182 return (0); 183 184 db_read_variable(vp, valuep); 185 186 return (1); 187 } 188 189 int 190 db_set_variable(value) 191 db_expr_t value; 192 { 193 const struct db_variable *vp; 194 195 if (!db_find_variable(&vp)) 196 return (0); 197 198 db_write_variable(vp, &value); 199 200 return (1); 201 } 202 203 204 void 205 db_read_variable(vp, valuep) 206 const struct db_variable *vp; 207 db_expr_t *valuep; 208 { 209 int (*func) __P((const struct db_variable *, db_expr_t *, int)) = vp->fcn; 210 211 if (func == FCN_NULL) 212 *valuep = *(vp->valuep); 213 else 214 (*func)(vp, valuep, DB_VAR_GET); 215 } 216 217 void 218 db_write_variable(vp, valuep) 219 const struct db_variable *vp; 220 db_expr_t *valuep; 221 { 222 int (*func) __P((const struct db_variable *, db_expr_t *, int)) = vp->fcn; 223 224 if (func == FCN_NULL) 225 *(vp->valuep) = *valuep; 226 else 227 (*func)(vp, valuep, DB_VAR_SET); 228 } 229 230 /*ARGSUSED*/ 231 void 232 db_set_cmd(addr, have_addr, count, modif) 233 db_expr_t addr; 234 int have_addr; 235 db_expr_t count; 236 char * modif; 237 { 238 db_expr_t value; 239 db_expr_t old_value; 240 const struct db_variable *vp; 241 int t; 242 243 t = db_read_token(); 244 if (t != tDOLLAR) { 245 db_error("Unknown variable\n"); 246 /*NOTREACHED*/ 247 } 248 if (!db_find_variable(&vp)) { 249 db_error("Unknown variable\n"); 250 /*NOTREACHED*/ 251 } 252 253 t = db_read_token(); 254 if (t != tEQ) 255 db_unread_token(t); 256 257 if (!db_expression(&value)) { 258 db_error("No value\n"); 259 /*NOTREACHED*/ 260 } 261 if (db_read_token() != tEOL) { 262 db_error("?\n"); 263 /*NOTREACHED*/ 264 } 265 266 db_read_variable(vp, &old_value); 267 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 268 db_printf("%s\n", db_num_to_str(value)); 269 db_write_variable(vp, &value); 270 } 271