db_variables.c revision 1.11
1 /* $NetBSD: db_variables.c,v 1.11 1997/02/04 00:33:32 cgd 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 (at) 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 unsigned int db_maxoff; 52 53 extern int db_radix; 54 extern int db_max_width; 55 extern int db_tab_stop_width; 56 extern int db_max_line; 57 58 static int db_rw_internal_variable __P((struct db_variable *, db_expr_t *, 59 int)); 60 61 /* XXX must all be ints for sysctl. */ 62 struct db_variable db_vars[] = { 63 { "radix", (long *)&db_radix, db_rw_internal_variable }, 64 { "maxoff", (long *)&db_maxoff, db_rw_internal_variable }, 65 { "maxwidth", (long *)&db_max_width, db_rw_internal_variable }, 66 { "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable }, 67 { "lines", (long *)&db_max_line, db_rw_internal_variable }, 68 { "onpanic", (long *)&db_onpanic, db_rw_internal_variable }, 69 }; 70 struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 71 72 /* 73 * ddb command line access to the DDB variables defined above. 74 */ 75 static int 76 db_rw_internal_variable(vp, valp, rw) 77 struct db_variable *vp; 78 db_expr_t *valp; 79 int rw; 80 { 81 82 if (rw == DB_VAR_GET) { 83 *valp = *(int *)vp->valuep; 84 } else { 85 *(int *)vp->valuep = *valp; 86 } 87 return (0); 88 } 89 90 /* 91 * sysctl(3) access to the DDB variables defined above. 92 */ 93 int 94 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 95 int *name; 96 u_int namelen; 97 void *oldp; 98 size_t *oldlenp; 99 void *newp; 100 size_t newlen; 101 struct proc *p; 102 { 103 104 /* All sysctl names at this level are terminal. */ 105 if (namelen != 1) 106 return (ENOTDIR); 107 108 switch (name[0]) { 109 case DDBCTL_RADIX: 110 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 111 112 case DDBCTL_MAXOFF: 113 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 114 115 case DDBCTL_MAXWIDTH: 116 return (sysctl_int(oldp, oldlenp, newp, newlen, 117 &db_max_width)); 118 119 case DDBCTL_TABSTOPS: 120 return (sysctl_int(oldp, oldlenp, newp, newlen, 121 &db_tab_stop_width)); 122 123 case DDBCTL_LINES: 124 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 125 126 case DDBCTL_ONPANIC: 127 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 128 } 129 130 return (EOPNOTSUPP); 131 } 132 133 int 134 db_find_variable(varp) 135 struct db_variable **varp; 136 { 137 int t; 138 struct db_variable *vp; 139 140 t = db_read_token(); 141 if (t == tIDENT) { 142 for (vp = db_vars; vp < db_evars; vp++) { 143 if (!strcmp(db_tok_string, vp->name)) { 144 *varp = vp; 145 return (1); 146 } 147 } 148 for (vp = db_regs; vp < db_eregs; vp++) { 149 if (!strcmp(db_tok_string, vp->name)) { 150 *varp = vp; 151 return (1); 152 } 153 } 154 } 155 db_error("Unknown variable\n"); 156 /*NOTREACHED*/ 157 return 0; 158 } 159 160 int 161 db_get_variable(valuep) 162 db_expr_t *valuep; 163 { 164 struct db_variable *vp; 165 166 if (!db_find_variable(&vp)) 167 return (0); 168 169 db_read_variable(vp, valuep); 170 171 return (1); 172 } 173 174 int 175 db_set_variable(value) 176 db_expr_t value; 177 { 178 struct db_variable *vp; 179 180 if (!db_find_variable(&vp)) 181 return (0); 182 183 db_write_variable(vp, &value); 184 185 return (1); 186 } 187 188 189 void 190 db_read_variable(vp, valuep) 191 struct db_variable *vp; 192 db_expr_t *valuep; 193 { 194 int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn; 195 196 if (func == FCN_NULL) 197 *valuep = *(vp->valuep); 198 else 199 (*func)(vp, valuep, DB_VAR_GET); 200 } 201 202 void 203 db_write_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 *(vp->valuep) = *valuep; 211 else 212 (*func)(vp, valuep, DB_VAR_SET); 213 } 214 215 /*ARGSUSED*/ 216 void 217 db_set_cmd(addr, have_addr, count, modif) 218 db_expr_t addr; 219 int have_addr; 220 db_expr_t count; 221 char * modif; 222 { 223 db_expr_t value; 224 struct db_variable *vp; 225 int t; 226 227 t = db_read_token(); 228 if (t != tDOLLAR) { 229 db_error("Unknown variable\n"); 230 /*NOTREACHED*/ 231 } 232 if (!db_find_variable(&vp)) { 233 db_error("Unknown variable\n"); 234 /*NOTREACHED*/ 235 } 236 237 t = db_read_token(); 238 if (t != tEQ) 239 db_unread_token(t); 240 241 if (!db_expression(&value)) { 242 db_error("No value\n"); 243 /*NOTREACHED*/ 244 } 245 if (db_read_token() != tEOL) { 246 db_error("?\n"); 247 /*NOTREACHED*/ 248 } 249 250 db_write_variable(vp, &value); 251 } 252
Indexes created Sun Sep 21 20:09:37 GMT 2025