db_variables.c revision 1.31
1 /* $NetBSD: db_variables.c,v 1.31 2004/05/25 04:31:48 atatat 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 (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/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.31 2004/05/25 04:31:48 atatat Exp $"); 31 32 #include "opt_ddbparam.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", (void *)&db_radix, db_rw_internal_variable }, 75 { "maxoff", (void *)&db_maxoff, db_rw_internal_variable }, 76 { "maxwidth", (void *)&db_max_width, db_rw_internal_variable }, 77 { "tabstops", (void *)&db_tab_stop_width, db_rw_internal_variable }, 78 { "lines", (void *)&db_max_line, db_rw_internal_variable }, 79 { "onpanic", (void *)&db_onpanic, db_rw_internal_variable }, 80 { "fromconsole", (void *)&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 SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup") 102 { 103 104 sysctl_createv(clog, 0, NULL, NULL, 105 CTLFLAG_PERMANENT, 106 CTLTYPE_NODE, "ddb", NULL, 107 NULL, 0, NULL, 0, 108 CTL_DDB, CTL_EOL); 109 110 sysctl_createv(clog, 0, NULL, NULL, 111 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 112 CTLTYPE_INT, "radix", 113 SYSCTL_DESCR("Input and output radix"), 114 NULL, 0, &db_radix, 0, 115 CTL_DDB, DDBCTL_RADIX, CTL_EOL); 116 sysctl_createv(clog, 0, NULL, NULL, 117 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 118 CTLTYPE_INT, "maxoff", 119 SYSCTL_DESCR("Maximum symbol offset"), 120 NULL, 0, &db_maxoff, 0, 121 CTL_DDB, DDBCTL_MAXOFF, CTL_EOL); 122 sysctl_createv(clog, 0, NULL, NULL, 123 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 124 CTLTYPE_INT, "maxwidth", 125 SYSCTL_DESCR("Maximum output line width"), 126 NULL, 0, &db_max_width, 0, 127 CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL); 128 sysctl_createv(clog, 0, NULL, NULL, 129 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 130 CTLTYPE_INT, "lines", 131 SYSCTL_DESCR("Number of display lines"), 132 NULL, 0, &db_max_line, 0, 133 CTL_DDB, DDBCTL_LINES, CTL_EOL); 134 sysctl_createv(clog, 0, NULL, NULL, 135 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 136 CTLTYPE_INT, "tabstops", 137 SYSCTL_DESCR("Output tab width"), 138 NULL, 0, &db_tab_stop_width, 0, 139 CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL); 140 sysctl_createv(clog, 0, NULL, NULL, 141 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 142 CTLTYPE_INT, "onpanic", 143 SYSCTL_DESCR("Whether to enter ddb on a kernel panic"), 144 NULL, 0, &db_onpanic, 0, 145 CTL_DDB, DDBCTL_ONPANIC, CTL_EOL); 146 sysctl_createv(clog, 0, NULL, NULL, 147 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 148 CTLTYPE_INT, "fromconsole", 149 SYSCTL_DESCR("Whether ddb can be entered from the " 150 "console"), 151 NULL, 0, &db_fromconsole, 0, 152 CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL); 153 } 154 155 int 156 db_find_variable(const struct db_variable **varp) 157 { 158 int t; 159 const struct db_variable *vp; 160 161 t = db_read_token(); 162 if (t == tIDENT) { 163 for (vp = db_vars; vp < db_evars; vp++) { 164 if (!strcmp(db_tok_string, vp->name)) { 165 *varp = vp; 166 return (1); 167 } 168 } 169 for (vp = db_regs; vp < db_eregs; vp++) { 170 if (!strcmp(db_tok_string, vp->name)) { 171 *varp = vp; 172 return (1); 173 } 174 } 175 } 176 db_error("Unknown variable\n"); 177 /*NOTREACHED*/ 178 return 0; 179 } 180 181 int 182 db_get_variable(db_expr_t *valuep) 183 { 184 const struct db_variable *vp; 185 186 if (!db_find_variable(&vp)) 187 return (0); 188 189 db_read_variable(vp, valuep); 190 191 return (1); 192 } 193 194 int 195 db_set_variable(db_expr_t value) 196 { 197 const struct db_variable *vp; 198 199 if (!db_find_variable(&vp)) 200 return (0); 201 202 db_write_variable(vp, &value); 203 204 return (1); 205 } 206 207 208 void 209 db_read_variable(const struct db_variable *vp, db_expr_t *valuep) 210 { 211 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; 212 213 if (func == FCN_NULL) 214 *valuep = *(vp->valuep); 215 else 216 (*func)(vp, valuep, DB_VAR_GET); 217 } 218 219 void 220 db_write_variable(const struct db_variable *vp, db_expr_t *valuep) 221 { 222 int (*func)(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(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 233 { 234 db_expr_t value; 235 db_expr_t old_value; 236 const struct db_variable *vp; 237 int t; 238 239 t = db_read_token(); 240 if (t != tDOLLAR) { 241 db_error("Unknown variable\n"); 242 /*NOTREACHED*/ 243 } 244 if (!db_find_variable(&vp)) { 245 db_error("Unknown variable\n"); 246 /*NOTREACHED*/ 247 } 248 249 t = db_read_token(); 250 if (t != tEQ) 251 db_unread_token(t); 252 253 if (!db_expression(&value)) { 254 db_error("No value\n"); 255 /*NOTREACHED*/ 256 } 257 if (db_read_token() != tEOL) { 258 db_error("?\n"); 259 /*NOTREACHED*/ 260 } 261 262 db_read_variable(vp, &old_value); 263 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 264 db_printf("%s\n", db_num_to_str(value)); 265 db_write_variable(vp, &value); 266 } 267
Indexes created Tue Sep 23 23:09:58 GMT 2025