1 /* $NetBSD: db_variables.c,v 1.24 2002/02/15 07:33:53 simonb 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 1.24 2002/02/15 07:33:53 simonb 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 static int db_rw_internal_variable(const struct db_variable *, db_expr_t *, 69 int); 70 static int db_find_variable(const struct db_variable **); 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(const struct db_variable *vp, db_expr_t *valp, int rw) 89 { 90 91 if (rw == DB_VAR_GET) 92 *valp = *(int *)vp->valuep; 93 else 94 *(int *)vp->valuep = *valp; 95 return (0); 96 } 97 98 /* 99 * sysctl(3) access to the DDB variables defined above. 100 */ 101 int 102 ddb_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 103 size_t newlen, struct proc *p) 104 { 105 106 /* All sysctl names at this level are terminal. */ 107 if (namelen != 1) 108 return (ENOTDIR); 109 110 switch (name[0]) { 111 case DDBCTL_RADIX: 112 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix)); 113 114 case DDBCTL_MAXOFF: 115 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff)); 116 117 case DDBCTL_MAXWIDTH: 118 return (sysctl_int(oldp, oldlenp, newp, newlen, 119 &db_max_width)); 120 121 case DDBCTL_TABSTOPS: 122 return (sysctl_int(oldp, oldlenp, newp, newlen, 123 &db_tab_stop_width)); 124 125 case DDBCTL_LINES: 126 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line)); 127 128 case DDBCTL_ONPANIC: 129 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic)); 130 case DDBCTL_FROMCONSOLE: 131 return (sysctl_int(oldp, oldlenp, newp, newlen, 132 &db_fromconsole)); 133 } 134 135 return (EOPNOTSUPP); 136 } 137 138 int 139 db_find_variable(const struct db_variable **varp) 140 { 141 int t; 142 const struct db_variable *vp; 143 144 t = db_read_token(); 145 if (t == tIDENT) { 146 for (vp = db_vars; vp < db_evars; vp++) { 147 if (!strcmp(db_tok_string, vp->name)) { 148 *varp = vp; 149 return (1); 150 } 151 } 152 for (vp = db_regs; vp < db_eregs; vp++) { 153 if (!strcmp(db_tok_string, vp->name)) { 154 *varp = vp; 155 return (1); 156 } 157 } 158 } 159 db_error("Unknown variable\n"); 160 /*NOTREACHED*/ 161 return 0; 162 } 163 164 int 165 db_get_variable(db_expr_t *valuep) 166 { 167 const struct db_variable *vp; 168 169 if (!db_find_variable(&vp)) 170 return (0); 171 172 db_read_variable(vp, valuep); 173 174 return (1); 175 } 176 177 int 178 db_set_variable(db_expr_t value) 179 { 180 const struct db_variable *vp; 181 182 if (!db_find_variable(&vp)) 183 return (0); 184 185 db_write_variable(vp, &value); 186 187 return (1); 188 } 189 190 191 void 192 db_read_variable(const struct db_variable *vp, db_expr_t *valuep) 193 { 194 int (*func)(const 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(const struct db_variable *vp, db_expr_t *valuep) 204 { 205 int (*func)(const 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(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 216 { 217 db_expr_t value; 218 db_expr_t old_value; 219 const struct db_variable *vp; 220 int t; 221 222 t = db_read_token(); 223 if (t != tDOLLAR) { 224 db_error("Unknown variable\n"); 225 /*NOTREACHED*/ 226 } 227 if (!db_find_variable(&vp)) { 228 db_error("Unknown variable\n"); 229 /*NOTREACHED*/ 230 } 231 232 t = db_read_token(); 233 if (t != tEQ) 234 db_unread_token(t); 235 236 if (!db_expression(&value)) { 237 db_error("No value\n"); 238 /*NOTREACHED*/ 239 } 240 if (db_read_token() != tEOL) { 241 db_error("?\n"); 242 /*NOTREACHED*/ 243 } 244 245 db_read_variable(vp, &old_value); 246 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 247 db_printf("%s\n", db_num_to_str(value)); 248 db_write_variable(vp, &value); 249 } 250