db_sym.c revision 1.40
1 /* $NetBSD: db_sym.c,v 1.40 2003/05/16 15:02:08 itojun 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 1.40 2003/05/16 15:02:08 itojun 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 const char *mod; 203 char *sym; 204 205 #ifdef DB_AOUT_SYMBOLS 206 db_expr_t newdiff; 207 db_sym_t ssym; 208 209 if (using_aout_symtab) { 210 newdiff = diff = ~0; 211 ssym = (*db_symformat->sym_search) 212 (NULL, val, strategy, &newdiff); 213 if ((unsigned int) newdiff < diff) { 214 diff = newdiff; 215 ret = ssym; 216 } 217 *offp = diff; 218 return ret; 219 } 220 #endif 221 222 if (ksyms_getname(&mod, &sym, val, strategy) == 0) { 223 (void)ksyms_getval(mod, sym, &naddr, KSYMS_ANY); 224 diff = val - naddr; 225 ret = naddr; 226 } 227 *offp = diff; 228 return ret; 229 } 230 231 /* 232 * Return name and value of a symbol 233 */ 234 void 235 db_symbol_values(db_sym_t sym, char **namep, db_expr_t *valuep) 236 { 237 const char *mod; 238 239 if (sym == DB_SYM_NULL) { 240 *namep = 0; 241 return; 242 } 243 244 #ifdef DB_AOUT_SYMBOLS 245 if (using_aout_symtab) { 246 db_expr_t value; 247 (*db_symformat->sym_value)(NULL, sym, namep, &value); 248 if (valuep) 249 *valuep = value; 250 return; 251 } 252 #endif 253 254 if (ksyms_getname(&mod, namep, sym, KSYMS_ANY|KSYMS_EXACT) == 0) { 255 if (valuep) 256 *valuep = sym; 257 } else 258 *namep = NULL; 259 } 260 261 262 /* 263 * Print a the closest symbol to value 264 * 265 * After matching the symbol according to the given strategy 266 * we print it in the name+offset format, provided the symbol's 267 * value is close enough (eg smaller than db_maxoff). 268 * We also attempt to print [filename:linenum] when applicable 269 * (eg for procedure names). 270 * 271 * If we could not find a reasonable name+offset representation, 272 * then we just print the value in hex. Small values might get 273 * bogus symbol associations, e.g. 3 might get some absolute 274 * value like _INCLUDE_VERSION or something, therefore we do 275 * not accept symbols whose value is zero (and use plain hex). 276 * Also, avoid printing as "end+0x????" which is useless. 277 * The variable db_lastsym is used instead of "end" in case we 278 * add support for symbols in loadable driver modules. 279 */ 280 extern char end[]; 281 unsigned long db_lastsym = (unsigned long)end; 282 unsigned int db_maxoff = 0x10000000; 283 284 void 285 db_symstr(char *buf, size_t buflen, db_expr_t off, db_strategy_t strategy) 286 { 287 char *name; 288 const char *mod; 289 long val; 290 291 #ifdef DB_AOUT_SYMBOLS 292 if (using_aout_symtab) { 293 db_expr_t d; 294 char *filename; 295 char *name; 296 db_expr_t value; 297 int linenum; 298 db_sym_t cursym; 299 300 if ((unsigned long) off <= db_lastsym) { 301 cursym = db_search_symbol(off, strategy, &d); 302 db_symbol_values(cursym, &name, &value); 303 if (name != NULL && 304 ((unsigned int) d < db_maxoff) && 305 value != 0) { 306 strlcpy(buf, name, buflen); 307 if (d) { 308 strlcat(buf, "+", buflen); 309 db_format_radix(buf+strlen(buf), 310 24, d, TRUE); 311 } 312 if (strategy == DB_STGY_PROC) { 313 if ((*db_symformat->sym_line_at_pc) 314 (NULL, cursym, &filename, 315 &linenum, off)) 316 sprintf(buf+strlen(buf), 317 " [%s:%d]", 318 filename, linenum); 319 } 320 return; 321 } 322 } 323 strlcpy(buf, db_num_to_str(off), buflen); 324 return; 325 } 326 #endif 327 if (ksyms_getname(&mod, &name, off, strategy|KSYMS_CLOSEST) == 0) { 328 (void)ksyms_getval(mod, name, &val, KSYMS_ANY); 329 if (((off - val) < db_maxoff) && val) { 330 sprintf(buf, "%s:%s", mod, name); 331 if (off - val) { 332 strlcat(buf, "+", buflen); 333 db_format_radix(buf+strlen(buf), 334 24, off - val, TRUE); 335 } 336 #ifdef notyet 337 if (strategy & KSYMS_PROC) { 338 if (ksyms_fmaddr(off, &filename, &linenum) == 0) sprintf(buf+strlen(buf), 339 " [%s:%d]", filename, linenum); 340 } 341 #endif 342 return; 343 } 344 } 345 strlcpy(buf, db_num_to_str(off), buflen); 346 } 347 348 void 349 db_printsym(db_expr_t off, db_strategy_t strategy, 350 void (*pr)(const char *, ...)) 351 { 352 char *name; 353 const char *mod; 354 long val; 355 #ifdef notyet 356 char *filename; 357 int linenum; 358 #endif 359 360 #ifdef DB_AOUT_SYMBOLS 361 if (using_aout_symtab) { 362 db_expr_t d; 363 char *filename; 364 char *name; 365 db_expr_t value; 366 int linenum; 367 db_sym_t cursym; 368 if ((unsigned long) off <= db_lastsym) { 369 cursym = db_search_symbol(off, strategy, &d); 370 db_symbol_values(cursym, &name, &value); 371 if (name != NULL && 372 ((unsigned int) d < db_maxoff) && 373 value != 0) { 374 (*pr)("%s", name); 375 if (d) { 376 char tbuf[24]; 377 378 db_format_radix(tbuf, 24, d, TRUE); 379 (*pr)("+%s", tbuf); 380 } 381 if (strategy == DB_STGY_PROC) { 382 if ((*db_symformat->sym_line_at_pc) 383 (NULL, cursym, &filename, 384 &linenum, off)) 385 (*pr)(" [%s:%d]", 386 filename, linenum); 387 } 388 return; 389 } 390 } 391 (*pr)(db_num_to_str(off)); 392 return; 393 } 394 #endif 395 if (ksyms_getname(&mod, &name, off, strategy|KSYMS_CLOSEST) == 0) { 396 (void)ksyms_getval(mod, name, &val, KSYMS_ANY); 397 if (((off - val) < db_maxoff) && val) { 398 (*pr)("%s:%s", mod, name); 399 if (off - val) { 400 char tbuf[24]; 401 402 db_format_radix(tbuf, 24, off - val, TRUE); 403 (*pr)("+%s", tbuf); 404 } 405 #ifdef notyet 406 if (strategy & KSYMS_PROC) { 407 if (ksyms_fmaddr(off, &filename, &linenum) == 0) 408 (*pr)(" [%s:%d]", filename, linenum); 409 } 410 #endif 411 return; 412 } 413 } 414 (*pr)(db_num_to_str(off)); 415 return; 416 } 417 418 /* 419 * Splits a string in the form "mod:sym" to two strings. 420 */ 421 static void 422 db_symsplit(char *str, char **mod, char **sym) 423 { 424 char *cp; 425 426 if ((cp = strchr(str, ':')) != NULL) { 427 *cp++ = '\0'; 428 *mod = str; 429 *sym = cp; 430 } else { 431 *mod = NULL; 432 *sym = str; 433 } 434 } 435 436 boolean_t 437 db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep) 438 { 439 #ifdef DB_AOUT_SYMBOLS 440 if (using_aout_symtab) 441 return ((*db_symformat->sym_numargs)(NULL, cursym, nargp, 442 argnamep)); 443 #endif 444 return (FALSE); 445 } 446 447
Indexes created Wed Sep 24 05:09:52 GMT 2025