1 /* $NetBSD: db_variables.c,v 1.22 2001/11/12 22:54:07 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 1.22 2001/11/12 22:54:07 lukem Exp $"); 31 32 #include "opt_ddb.h" /* for sysctl.h */ 33 #include "opt_ddbparam.h" 34 35 #include <sys/param.h> 36 #include <sys/proc.h> 37 #include <uvm/uvm_extern.h> 38 #include <sys/sysctl.h> 39 40 #include <machine/db_machdep.h> 41 42 #include <ddb/ddbvar.h> 43 44 #include <ddb/db_lex.h> 45 #include <ddb/db_variables.h> 46 #include <ddb/db_command.h> 47 #include <ddb/db_sym.h> 48 #include <ddb/db_extern.h> 49 #include <ddb/db_output.h> 50 51 52 /* 53 * If this is non-zero, the DDB will be entered when the system 54 * panics. Initialize it so that it's patchable. 55 */ 56 #ifndef DDB_ONPANIC 57 #define DDB_ONPANIC 1 58 #endif 59 int db_onpanic = DDB_ONPANIC; 60 61 /* 62 * Can DDB can be entered from the console? 63 */ 64 #ifndef DDB_FROMCONSOLE 65 #define DDB_FROMCONSOLE 1 66 #endif 67 int db_fromconsole = DDB_FROMCONSOLE; 68 69 70 static int db_rw_internal_variable __P((const struct db_variable *, 71 db_expr_t *, int)); 72 73 /* XXX must all be ints for sysctl. */ 74 const struct db_variable db_vars[] = { 75 { "radix", (long *)&db_radix, db_rw_internal_variable }, 76 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 77 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 78 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 79 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 80 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 81 { "fromconsole", (long *)&db_fromconsole, db_rw_internal_variable }, 82 }; 83 const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 84 85 /* 86 * ddb command line access to the DDB variables defined above. 87 */ 88 static int 89 db_rw_internal_variable(vp, valp, rw) 90 const struct db_variable *vp; 91 db_expr_t *valp; 92 int rw; 93 { 94 95 if (rw == DB_VAR_GET) { 96 *valp = *(int *)vp->valuep; 97 } else { 98 *(int *)vp->valuep = *valp; 99 } 100 return (0); 101 } 102 103 /* 104 * sysctl(3) access to the DDB variables defined above. 105 */ 106 int 107 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 108 int *name; 109 u_int namelen; 110 void *oldp; 111 size_t *oldlenp; 112 void *newp; 113 size_t newlen; 114 struct proc *p; 115 { 116 117 /* All sysctl names at this level are terminal. */ 118 if (namelen != 1) 119 return (ENOTDIR); 120 121 switch (name[0]) { 122 case DDBCTL_RADIX: 123 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 124 125 case DDBCTL_MAXOFF: 126 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 127 128 case DDBCTL_MAXWIDTH: 129 return (sysctl_int(oldp, oldlenp, newp, newlen, 130 &db_max_width)); 131 132 case DDBCTL_TABSTOPS: 133 return (sysctl_int(oldp, oldlenp, newp, newlen, 134 &db_tab_stop_width)); 135 136 case DDBCTL_LINES: 137 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 138 139 case DDBCTL_ONPANIC: 140 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 141 case DDBCTL_FROMCONSOLE: 142 return (sysctl_int(oldp, oldlenp, newp, newlen, 143 &db_fromconsole)); 144 } 145 146 return (EOPNOTSUPP); 147 } 148 149 int 150 db_find_variable(varp) 151 const struct db_variable **varp; 152 { 153 int t; 154 const struct db_variable *vp; 155 156 t = db_read_token(); 157 if (t == tIDENT) { 158 for (vp = db_vars; vp < db_evars; vp++) { 159 if (!strcmp(db_tok_string, vp->name)) { 160 *varp = vp; 161 return (1); 162 } 163 } 164 for (vp = db_regs; vp < db_eregs; vp++) { 165 if (!strcmp(db_tok_string, vp->name)) { 166 *varp = vp; 167 return (1); 168 } 169 } 170 } 171 db_error("Unknown variable\n"); 172 /*NOTREACHED*/ 173 return 0; 174 } 175 176 int 177 db_get_variable(valuep) 178 db_expr_t *valuep; 179 { 180 const struct db_variable *vp; 181 182 if (!db_find_variable(&vp)) 183 return (0); 184 185 db_read_variable(vp, valuep); 186 187 return (1); 188 } 189 190 int 191 db_set_variable(value) 192 db_expr_t value; 193 { 194 const struct db_variable *vp; 195 196 if (!db_find_variable(&vp)) 197 return (0); 198 199 db_write_variable(vp, &value); 200 201 return (1); 202 } 203 204 205 void 206 db_read_variable(vp, valuep) 207 const struct db_variable *vp; 208 db_expr_t *valuep; 209 { 210 int (*func) __P((const struct db_variable *, db_expr_t *, int)) = vp->fcn; 211 212 if (func == FCN_NULL) 213 *valuep = *(vp->valuep); 214 else 215 (*func)(vp, valuep, DB_VAR_GET); 216 } 217 218 void 219 db_write_variable(vp, valuep) 220 const struct db_variable *vp; 221 db_expr_t *valuep; 222 { 223 int (*func) __P((const struct db_variable *, db_expr_t *, int)) = vp->fcn; 224 225 if (func == FCN_NULL) 226 *(vp->valuep) = *valuep; 227 else 228 (*func)(vp, valuep, DB_VAR_SET); 229 } 230 231 /*ARGSUSED*/ 232 void 233 db_set_cmd(addr, have_addr, count, modif) 234 db_expr_t addr; 235 int have_addr; 236 db_expr_t count; 237 char * modif; 238 { 239 db_expr_t value; 240 db_expr_t old_value; 241 const 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_read_variable(vp, &old_value); 268 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 269 db_printf("%s\n", db_num_to_str(value)); 270 db_write_variable(vp, &value); 271 } 272