db_variables.c revision 1.43.4.1
1 /* $NetBSD: db_variables.c,v 1.43.4.1 2014/05/18 17:45:34 rmind 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 1.43.4.1 2014/05/18 17:45:34 rmind Exp $"); 31 32 #ifdef _KERNEL_OPT 33 #include "opt_ddbparam.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/proc.h> 38 #include <uvm/uvm_extern.h> 39 #include <sys/sysctl.h> 40 41 #include <ddb/ddb.h> 42 #include <ddb/ddbvar.h> 43 44 /* 45 * If this is non-zero, the DDB will be entered when the system 46 * panics. Initialize it so that it's patchable. 47 */ 48 #ifndef DDB_ONPANIC 49 #define DDB_ONPANIC 1 50 #endif 51 int db_onpanic = DDB_ONPANIC; 52 53 /* 54 * Can DDB can be entered from the console? 55 */ 56 #ifndef DDB_FROMCONSOLE 57 #define DDB_FROMCONSOLE 1 58 #endif 59 int db_fromconsole = DDB_FROMCONSOLE; 60 61 /* 62 * Output DDB output to the message buffer? 63 */ 64 #ifndef DDB_TEE_MSGBUF 65 #define DDB_TEE_MSGBUF 0 66 #endif 67 int db_tee_msgbuf = DDB_TEE_MSGBUF; 68 69 70 static int db_rw_internal_variable(const struct db_variable *, db_expr_t *, 71 int); 72 static int db_find_variable(const struct db_variable **); 73 74 /* XXX must all be ints for sysctl. */ 75 const struct db_variable db_vars[] = { 76 { "radix", (void *)&db_radix, db_rw_internal_variable, NULL }, 77 { "maxoff", (void *)&db_maxoff, db_rw_internal_variable, NULL }, 78 { "maxwidth", (void *)&db_max_width, db_rw_internal_variable, NULL }, 79 { "tabstops", (void *)&db_tab_stop_width, db_rw_internal_variable, NULL }, 80 { "lines", (void *)&db_max_line, db_rw_internal_variable, NULL }, 81 { "onpanic", (void *)&db_onpanic, db_rw_internal_variable, NULL }, 82 { "fromconsole", (void *)&db_fromconsole, db_rw_internal_variable, NULL }, 83 { "tee_msgbuf", (void *)&db_tee_msgbuf, db_rw_internal_variable, NULL }, 84 }; 85 const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); 86 87 /* 88 * ddb command line access to the DDB variables defined above. 89 */ 90 static int 91 db_rw_internal_variable(const struct db_variable *vp, db_expr_t *valp, int rw) 92 { 93 94 if (rw == DB_VAR_GET) 95 *valp = *(int *)vp->valuep; 96 else 97 *(int *)vp->valuep = *valp; 98 return (0); 99 } 100 101 /* 102 * sysctl(3) access to the DDB variables defined above. 103 */ 104 #ifdef _KERNEL 105 SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup") 106 { 107 108 sysctl_createv(clog, 0, NULL, NULL, 109 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 110 CTLTYPE_INT, "radix", 111 SYSCTL_DESCR("Input and output radix"), 112 NULL, 0, &db_radix, 0, 113 CTL_DDB, DDBCTL_RADIX, CTL_EOL); 114 sysctl_createv(clog, 0, NULL, NULL, 115 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 116 CTLTYPE_INT, "maxoff", 117 SYSCTL_DESCR("Maximum symbol offset"), 118 NULL, 0, &db_maxoff, 0, 119 CTL_DDB, DDBCTL_MAXOFF, CTL_EOL); 120 sysctl_createv(clog, 0, NULL, NULL, 121 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 122 CTLTYPE_INT, "maxwidth", 123 SYSCTL_DESCR("Maximum output line width"), 124 NULL, 0, &db_max_width, 0, 125 CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL); 126 sysctl_createv(clog, 0, NULL, NULL, 127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 128 CTLTYPE_INT, "lines", 129 SYSCTL_DESCR("Number of display lines"), 130 NULL, 0, &db_max_line, 0, 131 CTL_DDB, DDBCTL_LINES, CTL_EOL); 132 sysctl_createv(clog, 0, NULL, NULL, 133 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 134 CTLTYPE_INT, "tabstops", 135 SYSCTL_DESCR("Output tab width"), 136 NULL, 0, &db_tab_stop_width, 0, 137 CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL); 138 sysctl_createv(clog, 0, NULL, NULL, 139 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 140 CTLTYPE_INT, "onpanic", 141 SYSCTL_DESCR("Whether to enter ddb on a kernel panic"), 142 NULL, 0, &db_onpanic, 0, 143 CTL_DDB, DDBCTL_ONPANIC, CTL_EOL); 144 sysctl_createv(clog, 0, NULL, NULL, 145 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 146 CTLTYPE_INT, "fromconsole", 147 SYSCTL_DESCR("Whether ddb can be entered from the " 148 "console"), 149 NULL, 0, &db_fromconsole, 0, 150 CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL); 151 sysctl_createv(clog, 0, NULL, NULL, 152 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 153 CTLTYPE_INT, "tee_msgbuf", 154 SYSCTL_DESCR("Whether to tee ddb output to the msgbuf"), 155 NULL, 0, &db_tee_msgbuf, 0, 156 CTL_DDB, CTL_CREATE, CTL_EOL); 157 158 sysctl_createv(clog, 0, NULL, NULL, 159 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 160 CTLTYPE_STRING, "commandonenter", 161 SYSCTL_DESCR("Command to be executed on each ddb enter"), 162 NULL, 0, db_cmd_on_enter, DB_LINE_MAXLEN, 163 CTL_DDB, CTL_CREATE, CTL_EOL); 164 } 165 #endif /* _KERNEL */ 166 167 int 168 db_find_variable(const struct db_variable **varp) 169 { 170 int t; 171 const struct db_variable *vp; 172 173 t = db_read_token(); 174 if (t == tIDENT) { 175 for (vp = db_vars; vp < db_evars; vp++) { 176 if (!strcmp(db_tok_string, vp->name)) { 177 *varp = vp; 178 return (1); 179 } 180 } 181 for (vp = db_regs; vp < db_eregs; vp++) { 182 if (!strcmp(db_tok_string, vp->name)) { 183 *varp = vp; 184 return (1); 185 } 186 } 187 } 188 db_error("Unknown variable\n"); 189 /*NOTREACHED*/ 190 return 0; 191 } 192 193 int 194 db_get_variable(db_expr_t *valuep) 195 { 196 const struct db_variable *vp; 197 198 if (!db_find_variable(&vp)) 199 return (0); 200 201 db_read_variable(vp, valuep); 202 203 return (1); 204 } 205 206 int 207 db_set_variable(db_expr_t value) 208 { 209 const struct db_variable *vp; 210 211 if (!db_find_variable(&vp)) 212 return (0); 213 214 db_write_variable(vp, &value); 215 216 return (1); 217 } 218 219 220 void 221 db_read_variable(const struct db_variable *vp, db_expr_t *valuep) 222 { 223 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; 224 225 if (func == FCN_NULL) 226 *valuep = *(vp->valuep); 227 else 228 (*func)(vp, valuep, DB_VAR_GET); 229 } 230 231 void 232 db_write_variable(const struct db_variable *vp, db_expr_t *valuep) 233 { 234 int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; 235 236 if (func == FCN_NULL) 237 *(vp->valuep) = *valuep; 238 else 239 (*func)(vp, valuep, DB_VAR_SET); 240 } 241 242 /*ARGSUSED*/ 243 void 244 db_set_cmd(db_expr_t addr, bool have_addr, 245 db_expr_t count, const char *modif) 246 { 247 db_expr_t value; 248 db_expr_t old_value; 249 const struct db_variable *vp = NULL; /* XXX: GCC */ 250 int t; 251 252 t = db_read_token(); 253 if (t != tDOLLAR) { 254 db_error("Unknown variable\n"); 255 /*NOTREACHED*/ 256 } 257 if (!db_find_variable(&vp)) { 258 db_error("Unknown variable\n"); 259 /*NOTREACHED*/ 260 } 261 262 t = db_read_token(); 263 if (t != tEQ) 264 db_unread_token(t); 265 266 if (!db_expression(&value)) { 267 db_error("No value\n"); 268 /*NOTREACHED*/ 269 } 270 if (db_read_token() != tEOL) { 271 db_error("?\n"); 272 /*NOTREACHED*/ 273 } 274 275 db_read_variable(vp, &old_value); 276 db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); 277 db_printf("%s\n", db_num_to_str(value)); 278 db_write_variable(vp, &value); 279 } 280
Indexes created Sat Sep 27 14:09:57 GMT 2025