db_sym.c revision 1.37
1 /* $NetBSD: db_sym.c,v 1.37 2003/04/25 20:30:58 ragge 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_sym.c,v 1.37 2003/04/25 20:30:58 ragge Exp $"); 31 32 #include "opt_ddbparam.h" 33 34 #include <sys/param.h> 35 #include <sys/proc.h> 36 #include <sys/systm.h> 37 #include <sys/ksyms.h> 38 39 #include <machine/db_machdep.h> 40 41 #include <ddb/db_lex.h> 42 #include <ddb/db_sym.h> 43 #include <ddb/db_output.h> 44 #include <ddb/db_extern.h> 45 #include <ddb/db_command.h> 46 47 static void db_symsplit(char *, char **, char **); 48 49 50 #ifdef DB_AOUT_SYMBOLS 51 #define TBLNAME "netbsd" 52 53 static int using_aout_symtab; 54 const db_symformat_t *db_symformat; 55 static db_forall_func_t db_sift; 56 extern db_symformat_t db_symformat_aout; 57 #endif 58 59 60 /* 61 * Initialize the kernel debugger by initializing the master symbol 62 * table. Note that if initializing the master symbol table fails, 63 * no other symbol tables can be loaded. 64 */ 65 void 66 ddb_init(int symsize, void *vss, void *vse) 67 { 68 #ifdef DB_AOUT_SYMBOLS 69 db_symformat = &db_symformat_aout; 70 if ((*db_symformat->sym_init)(symsize, vss, vse, TBLNAME) == TRUE) { 71 using_aout_symtab = TRUE; 72 return; 73 } 74 #endif 75 ksyms_init(symsize, vss, vse); /* Will complain if necessary */ 76 } 77 78 boolean_t 79 db_eqname(char *src, char *dst, int c) 80 { 81 82 if (!strcmp(src, dst)) 83 return (TRUE); 84 if (src[0] == c) 85 return (!strcmp(src+1,dst)); 86 return (FALSE); 87 } 88 89 boolean_t 90 db_value_of_name(char *name, db_expr_t *valuep) 91 { 92 char *mod, *sym; 93 94 #ifdef DB_AOUT_SYMBOLS 95 db_sym_t ssym; 96 97 if (using_aout_symtab) { 98 /* 99 * Cannot load symtabs in a.out kernels, so the ':' 100 * style of selecting modules is irrelevant. 101 */ 102 ssym = (*db_symformat->sym_lookup)(NULL, name); 103 if (ssym == DB_SYM_NULL) 104 return (FALSE); 105 db_symbol_values(ssym, &name, valuep); 106 return (TRUE); 107 } 108 #endif 109 db_symsplit(name, &mod, &sym); 110 if (ksyms_getval(mod, sym, valuep, KSYMS_EXTERN) == 0) 111 return TRUE; 112 if (ksyms_getval(mod, sym, valuep, KSYMS_ANY) == 0) 113 return TRUE; 114 return FALSE; 115 } 116 117 #ifdef DB_AOUT_SYMBOLS 118 /* Private structure for passing args to db_sift() from db_sifting(). */ 119 struct db_sift_args { 120 char *symstr; 121 int mode; 122 }; 123 124 /* 125 * Does the work of db_sifting(), called once for each 126 * symbol via db_forall(), prints out symbols matching 127 * criteria. 128 */ 129 static void 130 db_sift(db_symtab_t *stab, db_sym_t sym, char *name, char *suffix, int prefix, 131 void *arg) 132 { 133 char c, sc; 134 char *find, *p; 135 size_t len; 136 struct db_sift_args *dsa; 137 138 dsa = (struct db_sift_args*)arg; 139 140 find = dsa->symstr; /* String we're looking for. */ 141 p = name; /* String we're searching within. */ 142 143 /* Matching algorithm cribbed from strstr(), which is not 144 in the kernel. */ 145 if ((c = *find++) != 0) { 146 len = strlen(find); 147 do { 148 do { 149 if ((sc = *p++) == 0) 150 return; 151 } while (sc != c); 152 } while (strncmp(p, find, len) != 0); 153 } 154 if (dsa->mode=='F') /* ala ls -F */ 155 db_printf("%s%s ", name, suffix); 156 else 157 db_printf("%s ", name); 158 } 159 #endif 160 161 /* 162 * "Sift" for a partial symbol. 163 * Named for the Sun OpenPROM command ("sifting"). 164 * If the symbol has a qualifier (e.g., ux:vm_map), 165 * then only the specified symbol table will be searched; 166 * otherwise, all symbol tables will be searched.. 167 * 168 * "mode" is how-to-display, set from modifiers. 169 */ 170 void 171 db_sifting(char *symstr, int mode) 172 { 173 char *mod, *sym; 174 175 #ifdef DB_AOUT_SYMBOLS 176 struct db_sift_args dsa; 177 178 if (using_aout_symtab) { 179 dsa.symstr = symstr; 180 dsa.mode = mode; 181 (*db_symformat->sym_forall)(NULL, db_sift, &dsa); 182 db_printf("\n"); 183 return; 184 } 185 #endif 186 187 db_symsplit(symstr, &mod, &sym); 188 if (ksyms_sift(mod, sym, mode) == ENODEV) 189 db_error("invalid symbol table name"); 190 } 191 192 /* 193 * Find the closest symbol to val, and return its name 194 * and the difference between val and the symbol found. 195 */ 196 db_sym_t 197 db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp) 198 { 199 unsigned int diff; 200 db_sym_t ret = DB_SYM_NULL; 201 db_addr_t naddr; 202 char *mod, *sym; 203 204 #ifdef DB_AOUT_SYMBOLS 205 db_expr_t newdiff; 206 db_sym_t ssym; 207 208 if (using_aout_symtab) { 209 newdiff = diff = ~0; 210 ssym = (*db_symformat->sym_search) 211 (NULL, val, strategy, &newdiff); 212 if ((unsigned int) newdiff < diff) { 213 diff = newdiff; 214 ret = ssym; 215 } 216 *offp = diff; 217 return ret; 218 } 219 #endif 220 221 if (ksyms_getname(&mod, &sym, val, strategy) == 0) { 222 (void)ksyms_getval(mod, sym, &naddr, KSYMS_ANY); 223 diff = val - naddr; 224 ret = naddr; 225 } 226 *offp = diff; 227 return ret; 228 } 229 230 /* 231 * Return name and value of a symbol 232 */ 233 void 234 db_symbol_values(db_sym_t sym, char **namep, db_expr_t *valuep) 235 { 236 char *mod; 237 238 if (sym == DB_SYM_NULL) { 239 *namep = 0; 240 return; 241 } 242 243 #ifdef DB_AOUT_SYMBOLS 244 if (using_aout_symtab) { 245 db_expr_t value; 246 (*db_symformat->sym_value)(NULL, sym, namep, &value); 247 if (valuep) 248 *valuep = value; 249 return; 250 } 251 #endif 252 253 if (ksyms_getname(&mod, namep, sym, KSYMS_ANY|KSYMS_EXACT) == 0) { 254 if (valuep) 255 *valuep = sym; 256 } else 257 *namep = NULL; 258 } 259 260 261 /* 262 * Print a the closest symbol to value 263 * 264 * After matching the symbol according to the given strategy 265 * we print it in the name+offset format, provided the symbol's 266 * value is close enough (eg smaller than db_maxoff). 267 * We also attempt to print [filename:linenum] when applicable 268 * (eg for procedure names). 269 * 270 * If we could not find a reasonable name+offset representation, 271 * then we just print the value in hex. Small values might get 272 * bogus symbol associations, e.g. 3 might get some absolute 273 * value like _INCLUDE_VERSION or something, therefore we do 274 * not accept symbols whose value is zero (and use plain hex). 275 * Also, avoid printing as "end+0x????" which is useless. 276 * The variable db_lastsym is used instead of "end" in case we 277 * add support for symbols in loadable driver modules. 278 */ 279 extern char end[]; 280 unsigned long db_lastsym = (unsigned long)end; 281 unsigned int db_maxoff = 0x10000000; 282 283 #if 0 284 void 285 db_symstr(char *buf, db_expr_t off, db_strategy_t strategy) 286 { 287 db_expr_t d; 288 char *filename; 289 char *name; 290 db_expr_t value; 291 int linenum; 292 db_sym_t cursym; 293 294 if ((unsigned long) off <= db_lastsym) { 295 cursym = db_search_symbol(off, strategy, &d); 296 db_symbol_values(cursym, &name, &value); 297 if (name != NULL && 298 ((unsigned int) d < db_maxoff) && 299 value != 0) { 300 strcpy(buf, name); 301 if (d) { 302 strcat(buf, "+"); 303 db_format_radix(buf+strlen(buf), 24, d, TRUE); 304 } 305 if (strategy == DB_STGY_PROC) { 306 if (db_line_at_pc(cursym, &filename, &linenum, 307 off)) 308 sprintf(buf+strlen(buf), 309 " [%s:%d]", filename, linenum); 310 } 311 return; 312 } 313 } 314 strcpy(buf, db_num_to_str(off)); 315 return; 316 } 317 #endif 318 319 void 320 db_printsym(db_expr_t off, db_strategy_t strategy, 321 void (*pr)(const char *, ...)) 322 { 323 char *name, *mod; 324 long val; 325 #ifdef notyet 326 char *filename; 327 int linenum; 328 #endif 329 330 #ifdef DB_AOUT_SYMBOLS 331 if (using_aout_symtab) { 332 db_expr_t d; 333 char *filename; 334 char *name; 335 db_expr_t value; 336 int linenum; 337 db_sym_t cursym; 338 if ((unsigned long) off <= db_lastsym) { 339 cursym = db_search_symbol(off, strategy, &d); 340 db_symbol_values(cursym, &name, &value); 341 if (name != NULL && 342 ((unsigned int) d < db_maxoff) && 343 value != 0) { 344 (*pr)("%s", name); 345 if (d) { 346 char tbuf[24]; 347 348 db_format_radix(tbuf, 24, d, TRUE); 349 (*pr)("+%s", tbuf); 350 } 351 if (strategy == DB_STGY_PROC) { 352 if ((*db_symformat->sym_line_at_pc) 353 (NULL, cursym, &filename, 354 &linenum, off)) 355 (*pr)(" [%s:%d]", 356 filename, linenum); 357 } 358 return; 359 } 360 } 361 (*pr)(db_num_to_str(off)); 362 return; 363 } 364 #endif 365 if (ksyms_getname(&mod, &name, off, strategy|KSYMS_CLOSEST) == 0) { 366 (void)ksyms_getval(mod, name, &val, KSYMS_ANY); 367 if (((off - val) < db_maxoff) && val) { 368 (*pr)("%s:%s", mod, name); 369 if (off - val) { 370 char tbuf[24]; 371 372 db_format_radix(tbuf, 24, off - val, TRUE); 373 (*pr)("+%s", tbuf); 374 } 375 #ifdef notyet 376 if (strategy & KSYMS_PROC) { 377 if (ksyms_fmaddr(off, &filename, &linenum) == 0) 378 (*pr)(" [%s:%d]", filename, linenum); 379 } 380 #endif 381 return; 382 } 383 } 384 (*pr)(db_num_to_str(off)); 385 return; 386 } 387 388 /* 389 * Splits a string in the form "mod:sym" to two strings. 390 */ 391 static void 392 db_symsplit(char *str, char **mod, char **sym) 393 { 394 char *cp; 395 396 if ((cp = strchr(str, ':')) != NULL) { 397 *cp++ = '\0'; 398 *mod = str; 399 *sym = cp; 400 } else { 401 *mod = NULL; 402 *sym = str; 403 } 404 } 405 406 boolean_t 407 db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep) 408 { 409 #ifdef DB_AOUT_SYMBOLS 410 if (using_aout_symtab) 411 return ((*db_symformat->sym_numargs)(NULL, cursym, nargp, 412 argnamep)); 413 #endif 414 return (FALSE); 415 } 416 417
Indexes created Tue Sep 23 02:09:52 GMT 2025