Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_sym.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: db_sym.c,v 1.45 2003/11/17 10:16:18 cube 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 1.45 2003/11/17 10:16:18 cube 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_from_kernel(mod, sym, &uval, KSYMS_EXTERN) == 0) { 113 val = (long) uval; 114 *valuep = (db_expr_t)val; 115 return TRUE; 116 } 117 if (ksyms_getval_from_kernel(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_from_kernel(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 = 0x10000000; 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 sprintf(buf+strlen(buf), 328 " [%s:%d]", 329 filename, linenum); 330 } 331 return; 332 } 333 } 334 strlcpy(buf, db_num_to_str(off), buflen); 335 return; 336 } 337 #endif 338 if (ksyms_getname(&mod, &name, (vaddr_t)off, 339 strategy|KSYMS_CLOSEST) == 0) { 340 (void)ksyms_getval_from_kernel(mod, name, &val, KSYMS_ANY); 341 if (((off - val) < db_maxoff) && val) { 342 sprintf(buf, "%s:%s", mod, name); 343 if (off - val) { 344 strlcat(buf, "+", buflen); 345 db_format_radix(buf+strlen(buf), 346 24, off - val, TRUE); 347 } 348 #ifdef notyet 349 if (strategy & KSYMS_PROC) { 350 if (ksyms_fmaddr(off, &filename, &linenum) == 0) sprintf(buf+strlen(buf), 351 " [%s:%d]", filename, linenum); 352 } 353 #endif 354 return; 355 } 356 } 357 strlcpy(buf, db_num_to_str(off), buflen); 358 } 359 360 void 361 db_printsym(db_expr_t off, db_strategy_t strategy, 362 void (*pr)(const char *, ...)) 363 { 364 char *name; 365 const char *mod; 366 unsigned long uval; 367 long val; 368 #ifdef notyet 369 char *filename; 370 int linenum; 371 #endif 372 373 #ifdef DB_AOUT_SYMBOLS 374 if (using_aout_symtab) { 375 db_expr_t d; 376 char *filename; 377 char *name; 378 db_expr_t value; 379 int linenum; 380 db_sym_t cursym; 381 if ((unsigned long) off <= db_lastsym) { 382 cursym = db_search_symbol(off, strategy, &d); 383 db_symbol_values(cursym, &name, &value); 384 if (name != NULL && 385 ((unsigned int) d < db_maxoff) && 386 value != 0) { 387 (*pr)("%s", name); 388 if (d) { 389 char tbuf[24]; 390 391 db_format_radix(tbuf, 24, d, TRUE); 392 (*pr)("+%s", tbuf); 393 } 394 if (strategy == DB_STGY_PROC) { 395 if ((*db_symformat->sym_line_at_pc) 396 (NULL, cursym, &filename, 397 &linenum, off)) 398 (*pr)(" [%s:%d]", 399 filename, linenum); 400 } 401 return; 402 } 403 } 404 (*pr)(db_num_to_str(off)); 405 return; 406 } 407 #endif 408 if (ksyms_getname(&mod, &name, (vaddr_t)off, 409 strategy|KSYMS_CLOSEST) == 0) { 410 (void)ksyms_getval_from_kernel(mod, name, &uval, KSYMS_ANY); 411 val = (long) uval; 412 if (((off - val) < db_maxoff) && val) { 413 (*pr)("%s:%s", mod, name); 414 if (off - val) { 415 char tbuf[24]; 416 417 db_format_radix(tbuf, 24, off - val, TRUE); 418 (*pr)("+%s", tbuf); 419 } 420 #ifdef notyet 421 if (strategy & KSYMS_PROC) { 422 if (ksyms_fmaddr(off, &filename, &linenum) == 0) 423 (*pr)(" [%s:%d]", filename, linenum); 424 } 425 #endif 426 return; 427 } 428 } 429 (*pr)(db_num_to_str(off)); 430 return; 431 } 432 433 /* 434 * Splits a string in the form "mod:sym" to two strings. 435 */ 436 static void 437 db_symsplit(char *str, char **mod, char **sym) 438 { 439 char *cp; 440 441 if ((cp = strchr(str, ':')) != NULL) { 442 *cp++ = '\0'; 443 *mod = str; 444 *sym = cp; 445 } else { 446 *mod = NULL; 447 *sym = str; 448 } 449 } 450 451 boolean_t 452 db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep) 453 { 454 #ifdef DB_AOUT_SYMBOLS 455 if (using_aout_symtab) 456 return ((*db_symformat->sym_numargs)(NULL, cursym, nargp, 457 argnamep)); 458 #endif 459 return (FALSE); 460 } 461
Cache object: 25a6d3e2ddfb3c97838f398000b034e7
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]