db_variables.c revision 1.32
1 /* $NetBSD: db_variables.c,v 1.32 2004/09/29 23:54:11 reinoud 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 1.32 2004/09/29 23:54:11 reinoud 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 /* 69 * Output DDB output to the message buffer? 70 */ 71 #ifndef DDB_TEE_MSGBUF 72 #define DDB_TEE_MSGBUF 0 73 #endif 74 int db_tee_msgbuf = DDB_TEE_MSGBUF; 75 76 77 static int db_rw_internal_variable(const struct db_variable *, db_expr_t *, 78 int); 79 static int db_find_variable(const struct db_variable **); 80 81 /* XXX must all be ints for sysctl. */ 82 const struct db_variable db_vars[] = { 83 { "radix", (void *)&db_radix, db_rw_internal_variable }, 84 { "maxoff", (void *)&db_maxoff, db_rw_internal_variable }, 85 { "maxwidth", (void *)&db_max_width, db_rw_internal_variable }, 86 { "tabstops", (void *)&db_tab_stop_width, db_rw_internal_variable }, 87 { "lines", (void *)&db_max_line, db_rw_internal_variable }, 88 { "onpanic", (void *)&db_onpanic, db_rw_internal_variable }, 89 { "fromconsole", (void *)&db_fromconsole, db_rw_internal_variable }, 90 { "tee_msgbuf", (void *)&db_tee_msgbuf, db_rw_internal_variable }, 91 }; 92 const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 93 94 /* 95 * ddb command line access to the DDB variables defined above. 96 */ 97 static int 98 db_rw_internal_variable(const struct db_variable *vp, db_expr_t *valp, int rw) 99 { 100 101 if (rw == DB_VAR_GET) 102 *valp = *(int *)vp->valuep; 103 else 104 *(int *)vp->valuep = *valp; 105 return (0); 106 } 107 108 /* 109 * sysctl(3) access to the DDB variables defined above. 110 */ 111 SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup") 112 { 113 114 sysctl_createv(clog, 0, NULL, NULL, 115 CTLFLAG_PERMANENT, 116 CTLTYPE_NODE, "ddb", NULL, 117 NULL, 0, NULL, 0, 118 CTL_DDB, CTL_EOL); 119 120 sysctl_createv(clog, 0, NULL, NULL, 121 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 122 CTLTYPE_INT, "radix", 123 SYSCTL_DESCR("Input and output radix"), 124 NULL, 0, &db_radix, 0, 125 CTL_DDB, DDBCTL_RADIX, CTL_EOL); 126 sysctl_createv(clog, 0, NULL, NULL, 127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 128 CTLTYPE_INT, "maxoff", 129 SYSCTL_DESCR("Maximum symbol offset"), 130 NULL, 0, &db_maxoff, 0, 131 CTL_DDB, DDBCTL_MAXOFF, CTL_EOL); 132 sysctl_createv(clog, 0, NULL, NULL, 133 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 134 CTLTYPE_INT, "maxwidth", 135 SYSCTL_DESCR("Maximum output line width"), 136 NULL, 0, &db_max_width, 0, 137 CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL); 138 sysctl_createv(clog, 0, NULL, NULL, 139 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 140 CTLTYPE_INT, "lines", 141 SYSCTL_DESCR("Number of display lines"), 142 NULL, 0, &db_max_line, 0, 143 CTL_DDB, DDBCTL_LINES, CTL_EOL); 144 sysctl_createv(clog, 0, NULL, NULL, 145 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 146 CTLTYPE_INT, "tabstops", 147 SYSCTL_DESCR("Output tab width"), 148 NULL, 0, &db_tab_stop_width, 0, 149 CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL); 150 sysctl_createv(clog, 0, NULL, NULL, 151 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 152 CTLTYPE_INT, "onpanic", 153 SYSCTL_DESCR("Whether to enter ddb on a kernel panic"), 154 NULL, 0, &db_onpanic, 0, 155 CTL_DDB, DDBCTL_ONPANIC, CTL_EOL); 156 sysctl_createv(clog, 0, NULL, NULL, 157 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 158 CTLTYPE_INT, "fromconsole", 159 SYSCTL_DESCR("Whether ddb can be entered from the " 160 "console"), 161 NULL, 0, &db_fromconsole, 0, 162 CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL); 163 sysctl_createv(clog, 0, NULL, NULL, 164 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 165 CTLTYPE_INT, "tee_msgbuf", 166 SYSCTL_DESCR("Whether to tee ddb output to the msgbuf"), 167 NULL, 0, &db_tee_msgbuf, 0, 168 CTL_DDB, CTL_CREATE, CTL_EOL); 169 } 170 171 int 172 db_find_variable(const struct db_variable **varp) 173 { 174 int t; 175 const struct db_variable *vp; 176 177 t = db_read_token(); 178 if (t == tIDENT) { 179 for (vp = db_vars; vp < db_evars; vp++) { 180 if (!strcmp(db_tok_string, vp->name)) { 181 *varp = vp; 182 return (1); 183 } 184 } 185 for (vp = db_regs; vp < db_eregs; vp++) { 186 if (!strcmp(db_tok_string, vp->name)) { 187 *varp = vp; 188 return (1); 189 } 190 } 191 } 192 db_error("Unknown variable\n"); 193 /*NOTREACHED*/ 194 return 0; 195 } 196 197 int 198 db_get_variable(db_expr_t *valuep) 199 { 200 const struct db_variable *vp; 201 202 if (!db_find_variable(&vp)) 203 return (0); 204 205 db_read_variable(vp, valuep); 206 207 return (1); 208 } 209 210 int 211 db_set_variable(db_expr_t value) 212 { 213 const struct db_variable *vp; 214 215 if (!db_find_variable(&vp)) 216 return (0); 217 218 db_write_variable(vp, &value); 219 220 return (1); 221 } 222 223 224 void 225 db_read_variable(const struct db_variable *vp, db_expr_t *valuep) 226 { 227 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; 228 229 if (func == FCN_NULL) 230 *valuep = *(vp->valuep); 231 else 232 (*func)(vp, valuep, DB_VAR_GET); 233 } 234 235 void 236 db_write_variable(const struct db_variable *vp, db_expr_t *valuep) 237 { 238 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; 239 240 if (func == FCN_NULL) 241 *(vp->valuep) = *valuep; 242 else 243 (*func)(vp, valuep, DB_VAR_SET); 244 } 245 246 /*ARGSUSED*/ 247 void 248 db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 249 { 250 db_expr_t value; 251 db_expr_t old_value; 252 const struct db_variable *vp; 253 int t; 254 255 t = db_read_token(); 256 if (t != tDOLLAR) { 257 db_error("Unknown variable\n"); 258 /*NOTREACHED*/ 259 } 260 if (!db_find_variable(&vp)) { 261 db_error("Unknown variable\n"); 262 /*NOTREACHED*/ 263 } 264 265 t = db_read_token(); 266 if (t != tEQ) 267 db_unread_token(t); 268 269 if (!db_expression(&value)) { 270 db_error("No value\n"); 271 /*NOTREACHED*/ 272 } 273 if (db_read_token() != tEOL) { 274 db_error("?\n"); 275 /*NOTREACHED*/ 276 } 277 278 db_read_variable(vp, &old_value); 279 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 280 db_printf("%s\n", db_num_to_str(value)); 281 db_write_variable(vp, &value); 282 } 283
Indexes created Sun Sep 21 20:09:37 GMT 2025