Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_sym.c
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1 /* $NetBSD: db_sym.c,v 1.49 2005/02/26 23:04:17 perry 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@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 1.49 2005/02/26 23:04:17 perry 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 unsigned long uval; 94 long val; 95 96 #ifdef DB_AOUT_SYMBOLS 97 db_sym_t ssym; 98 99 if (using_aout_symtab) { 100 /* 101 * Cannot load symtabs in a.out kernels, so the ':' 102 * style of selecting modules is irrelevant. 103 */ 104 ssym = (*db_symformat->sym_lookup)(NULL, name); 105 if (ssym == DB_SYM_NULL) 106 return (FALSE); 107 db_symbol_values(ssym, &name, valuep); 108 return (TRUE); 109 } 110 #endif 111 db_symsplit(name, &mod, &sym); 112 if (ksyms_getval(mod, sym, &uval, KSYMS_EXTERN) == 0) { 113 val = (long) uval; 114 *valuep = (db_expr_t)val; 115 return TRUE; 116 } 117 if (ksyms_getval(mod, sym, &uval, KSYMS_ANY) == 0) { 118 val = (long) uval; 119 *valuep = (db_expr_t)val; 120 return TRUE; 121 } 122 return FALSE; 123 } 124 125 #ifdef DB_AOUT_SYMBOLS 126 /* Private structure for passing args to db_sift() from db_sifting(). */ 127 struct db_sift_args { 128 char *symstr; 129 int mode; 130 }; 131 132 /* 133 * Does the work of db_sifting(), called once for each 134 * symbol via db_forall(), prints out symbols matching 135 * criteria. 136 */ 137 static void 138 db_sift(db_symtab_t *stab, db_sym_t sym, char *name, char *suffix, int prefix, 139 void *arg) 140 { 141 char c, sc; 142 char *find, *p; 143 size_t len; 144 struct db_sift_args *dsa; 145 146 dsa = (struct db_sift_args*)arg; 147 148 find = dsa->symstr; /* String we're looking for. */ 149 p = name; /* String we're searching within. */ 150 151 /* Matching algorithm cribbed from strstr(), which is not 152 in the kernel. */ 153 if ((c = *find++) != 0) { 154 len = strlen(find); 155 do { 156 do { 157 if ((sc = *p++) == 0) 158 return; 159 } while (sc != c); 160 } while (strncmp(p, find, len) != 0); 161 } 162 if (dsa->mode=='F') /* ala ls -F */ 163 db_printf("%s%s ", name, suffix); 164 else 165 db_printf("%s ", name); 166 } 167 #endif 168 169 /* 170 * "Sift" for a partial symbol. 171 * Named for the Sun OpenPROM command ("sifting"). 172 * If the symbol has a qualifier (e.g., ux:vm_map), 173 * then only the specified symbol table will be searched; 174 * otherwise, all symbol tables will be searched.. 175 * 176 * "mode" is how-to-display, set from modifiers. 177 */ 178 void 179 db_sifting(char *symstr, int mode) 180 { 181 char *mod, *sym; 182 183 #ifdef DB_AOUT_SYMBOLS 184 struct db_sift_args dsa; 185 186 if (using_aout_symtab) { 187 dsa.symstr = symstr; 188 dsa.mode = mode; 189 (*db_symformat->sym_forall)(NULL, db_sift, &dsa); 190 db_printf("\n"); 191 return; 192 } 193 #endif 194 195 db_symsplit(symstr, &mod, &sym); 196 if (ksyms_sift(mod, sym, mode) == ENODEV) 197 db_error("invalid symbol table name"); 198 } 199 200 /* 201 * Find the closest symbol to val, and return its name 202 * and the difference between val and the symbol found. 203 */ 204 db_sym_t 205 db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp) 206 { 207 /*###207 [cc] warning: `diff' might be used uninitialized in this function%%%*/ 208 unsigned int diff; 209 unsigned long naddr; 210 db_sym_t ret = DB_SYM_NULL; 211 const char *mod; 212 char *sym; 213 214 #ifdef DB_AOUT_SYMBOLS 215 db_expr_t newdiff; 216 db_sym_t ssym; 217 218 if (using_aout_symtab) { 219 newdiff = diff = ~0; 220 ssym = (*db_symformat->sym_search) 221 (NULL, val, strategy, &newdiff); 222 if ((unsigned int) newdiff < diff) { 223 diff = newdiff; 224 ret = ssym; 225 } 226 *offp = diff; 227 return ret; 228 } 229 #endif 230 231 if (ksyms_getname(&mod, &sym, (vaddr_t)val, strategy) == 0) { 232 (void)ksyms_getval(mod, sym, &naddr, KSYMS_ANY); 233 diff = val - (db_addr_t)naddr; 234 ret = (db_sym_t)naddr; 235 } else 236 diff = 0; 237 *offp = diff; 238 return ret; 239 } 240 241 /* 242 * Return name and value of a symbol 243 */ 244 void 245 db_symbol_values(db_sym_t sym, char **namep, db_expr_t *valuep) 246 { 247 const char *mod; 248 249 if (sym == DB_SYM_NULL) { 250 *namep = 0; 251 return; 252 } 253 254 #ifdef DB_AOUT_SYMBOLS 255 if (using_aout_symtab) { 256 db_expr_t value; 257 (*db_symformat->sym_value)(NULL, sym, namep, &value); 258 if (valuep) 259 *valuep = value; 260 return; 261 } 262 #endif 263 264 if (ksyms_getname(&mod, namep, (vaddr_t)sym, 265 KSYMS_ANY|KSYMS_EXACT) == 0) { 266 if (valuep) 267 *valuep = sym; 268 } else 269 *namep = NULL; 270 } 271 272 273 /* 274 * Print a the closest symbol to value 275 * 276 * After matching the symbol according to the given strategy 277 * we print it in the name+offset format, provided the symbol's 278 * value is close enough (eg smaller than db_maxoff). 279 * We also attempt to print [filename:linenum] when applicable 280 * (eg for procedure names). 281 * 282 * If we could not find a reasonable name+offset representation, 283 * then we just print the value in hex. Small values might get 284 * bogus symbol associations, e.g. 3 might get some absolute 285 * value like _INCLUDE_VERSION or something, therefore we do 286 * not accept symbols whose value is zero (and use plain hex). 287 * Also, avoid printing as "end+0x????" which is useless. 288 * The variable db_lastsym is used instead of "end" in case we 289 * add support for symbols in loadable driver modules. 290 */ 291 extern char end[]; 292 unsigned long db_lastsym = (unsigned long)end; 293 unsigned int db_maxoff = 0x100000; 294 295 void 296 db_symstr(char *buf, size_t buflen, db_expr_t off, db_strategy_t strategy) 297 { 298 char *name; 299 const char *mod; 300 unsigned long val; 301 302 #ifdef DB_AOUT_SYMBOLS 303 if (using_aout_symtab) { 304 db_expr_t d; 305 char *filename; 306 char *name; 307 db_expr_t value; 308 int linenum; 309 db_sym_t cursym; 310 311 if ((unsigned long) off <= db_lastsym) { 312 cursym = db_search_symbol(off, strategy, &d); 313 db_symbol_values(cursym, &name, &value); 314 if (name != NULL && 315 ((unsigned int) d < db_maxoff) && 316 value != 0) { 317 strlcpy(buf, name, buflen); 318 if (d) { 319 strlcat(buf, "+", buflen); 320 db_format_radix(buf+strlen(buf), 321 24, d, TRUE); 322 } 323 if (strategy == DB_STGY_PROC) { 324 if ((*db_symformat->sym_line_at_pc) 325 (NULL, cursym, &filename, 326 &linenum, off)) 327 snprintf(buf + strlen(buf), 328 buflen - strlen(buf), 329 " [%s:%d]", 330 filename, linenum); 331 } 332 return; 333 } 334 } 335 strlcpy(buf, db_num_to_str(off), buflen); 336 return; 337 } 338 #endif 339 if (ksyms_getname(&mod, &name, (vaddr_t)off, 340 strategy|KSYMS_CLOSEST) == 0) { 341 (void)ksyms_getval(mod, name, &val, KSYMS_ANY); 342 if (((off - val) < db_maxoff) && val) { 343 snprintf(buf, buflen, "%s:%s", mod, name); 344 if (off - val) { 345 strlcat(buf, "+", buflen); 346 db_format_radix(buf+strlen(buf), 347 24, off - val, TRUE); 348 } 349 #ifdef notyet 350 if (strategy & KSYMS_PROC) { 351 if (ksyms_fmaddr(off, &filename, &linenum) == 0) 352 snprintf(buf + strlen(buf), 353 buflen - strlen(buf), 354 " [%s:%d]", filename, linenum); 355 } 356 #endif 357 return; 358 } 359 } 360 strlcpy(buf, db_num_to_str(off), buflen); 361 } 362 363 void 364 db_printsym(db_expr_t off, db_strategy_t strategy, 365 void (*pr)(const char *, ...)) 366 { 367 char *name; 368 const char *mod; 369 unsigned long uval; 370 long val; 371 #ifdef notyet 372 char *filename; 373 int linenum; 374 #endif 375 376 #ifdef DB_AOUT_SYMBOLS 377 if (using_aout_symtab) { 378 db_expr_t d; 379 char *filename; 380 char *name; 381 db_expr_t value; 382 int linenum; 383 db_sym_t cursym; 384 if ((unsigned long) off <= db_lastsym) { 385 cursym = db_search_symbol(off, strategy, &d); 386 db_symbol_values(cursym, &name, &value); 387 if (name != NULL && 388 ((unsigned int) d < db_maxoff) && 389 value != 0) { 390 (*pr)("%s", name); 391 if (d) { 392 char tbuf[24]; 393 394 db_format_radix(tbuf, 24, d, TRUE); 395 (*pr)("+%s", tbuf); 396 } 397 if (strategy == DB_STGY_PROC) { 398 if ((*db_symformat->sym_line_at_pc) 399 (NULL, cursym, &filename, 400 &linenum, off)) 401 (*pr)(" [%s:%d]", 402 filename, linenum); 403 } 404 return; 405 } 406 } 407 (*pr)(db_num_to_str(off)); 408 return; 409 } 410 #endif 411 if (ksyms_getname(&mod, &name, (vaddr_t)off, 412 strategy|KSYMS_CLOSEST) == 0) { 413 (void)ksyms_getval(mod, name, &uval, KSYMS_ANY); 414 val = (long) uval; 415 if (((off - val) < db_maxoff) && val) { 416 (*pr)("%s:%s", mod, name); 417 if (off - val) { 418 char tbuf[24]; 419 420 db_format_radix(tbuf, 24, off - val, TRUE); 421 (*pr)("+%s", tbuf); 422 } 423 #ifdef notyet 424 if (strategy & KSYMS_PROC) { 425 if (ksyms_fmaddr(off, &filename, &linenum) == 0) 426 (*pr)(" [%s:%d]", filename, linenum); 427 } 428 #endif 429 return; 430 } 431 } 432 (*pr)(db_num_to_str(off)); 433 return; 434 } 435 436 /* 437 * Splits a string in the form "mod:sym" to two strings. 438 */ 439 static void 440 db_symsplit(char *str, char **mod, char **sym) 441 { 442 char *cp; 443 444 if ((cp = strchr(str, ':')) != NULL) { 445 *cp++ = '\0'; 446 *mod = str; 447 *sym = cp; 448 } else { 449 *mod = NULL; 450 *sym = str; 451 } 452 } 453 454 boolean_t 455 db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep) 456 { 457 #ifdef DB_AOUT_SYMBOLS 458 if (using_aout_symtab) 459 return ((*db_symformat->sym_numargs)(NULL, cursym, nargp, 460 argnamep)); 461 #endif 462 return (FALSE); 463 } 464
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