/* $NetBSD: db_sym.c,v 1.59 2009/03/07 22:02:17 ad Exp $ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #include __KERNEL_RCSID(0, "$NetBSD: db_sym.c,v 1.59 2009/03/07 22:02:17 ad Exp $"); #ifdef _KERNEL_OPT #include "opt_ddbparam.h" #endif #include #include #include #include #include static void db_symsplit(char *, char **, char **); #ifdef DB_AOUT_SYMBOLS #define TBLNAME "netbsd" static int using_aout_symtab; const db_symformat_t *db_symformat; static db_forall_func_t db_sift; extern db_symformat_t db_symformat_aout; extern db_symformat_t db_symformat_elf; #endif /* * Initialize the kernel debugger by initializing the master symbol * table. Note that if initializing the master symbol table fails, * no other symbol tables can be loaded. */ void ddb_init(int symsize, void *vss, void *vse) { #ifdef _KERNEL # ifdef DB_AOUT_SYMBOLS db_symformat = &db_symformat_aout; if ((*db_symformat->sym_init)(symsize, vss, vse, TBLNAME) == true) { using_aout_symtab = true; return; } # endif ksyms_addsyms_elf(symsize, vss, vse); /* Will complain if necessary */ #else /* _KERNEL */ db_symformat = &db_symformat_elf; if ((*db_symformat->sym_init)(symsize, vss, vse, TBLNAME) == true) { using_aout_symtab = true; return; } #endif /* _KERNEL */ } bool db_eqname(const char *src, const char *dst, int c) { if (!strcmp(src, dst)) return (true); if (src[0] == c) return (!strcmp(src+1,dst)); return (false); } bool db_value_of_name(const char *name, db_expr_t *valuep) { char symbol[128]; char *mod, *sym; #ifdef _KERNEL unsigned long uval; long val; #endif #ifdef DB_AOUT_SYMBOLS db_sym_t ssym; if (using_aout_symtab) { /* * Cannot load symtabs in a.out kernels, so the ':' * style of selecting modules is irrelevant. */ ssym = (*db_symformat->sym_lookup)(NULL, name); if (ssym == DB_SYM_NULL) return (false); db_symbol_values(ssym, &name, valuep); return (true); } #endif (void)strlcpy(symbol, name, sizeof(symbol)); db_symsplit(symbol, &mod, &sym); #ifdef _KERNEL if (ksyms_getval_unlocked(mod, sym, &uval, KSYMS_EXTERN) == 0) { val = (long) uval; *valuep = (db_expr_t)val; return true; } if (ksyms_getval_unlocked(mod, sym, &uval, KSYMS_ANY) == 0) { val = (long) uval; *valuep = (db_expr_t)val; return true; } #endif return false; } #ifdef DB_AOUT_SYMBOLS /* Private structure for passing args to db_sift() from db_sifting(). */ struct db_sift_args { char *symstr; int mode; }; /* * Does the work of db_sifting(), called once for each * symbol via db_forall(), prints out symbols matching * criteria. */ static void db_sift(db_symtab_t *stab, db_sym_t sym, char *name, char *suffix, int prefix, void *arg) { char c, sc; char *find, *p; size_t len; struct db_sift_args *dsa; dsa = (struct db_sift_args*)arg; find = dsa->symstr; /* String we're looking for. */ p = name; /* String we're searching within. */ /* Matching algorithm cribbed from strstr(), which is not in the kernel. */ if ((c = *find++) != 0) { len = strlen(find); do { do { if ((sc = *p++) == 0) return; } while (sc != c); } while (strncmp(p, find, len) != 0); } if (dsa->mode=='F') /* ala ls -F */ db_printf("%s%s ", name, suffix); else db_printf("%s ", name); } #endif /* * "Sift" for a partial symbol. * Named for the Sun OpenPROM command ("sifting"). * If the symbol has a qualifier (e.g., ux:vm_map), * then only the specified symbol table will be searched; * otherwise, all symbol tables will be searched.. * * "mode" is how-to-display, set from modifiers. */ void db_sifting(char *symstr, int mode) { #ifdef _KERNEL char *mod, *sym; #endif #ifdef DB_AOUT_SYMBOLS struct db_sift_args dsa; if (using_aout_symtab) { dsa.symstr = symstr; dsa.mode = mode; (*db_symformat->sym_forall)(NULL, db_sift, &dsa); db_printf("\n"); return; } #endif #ifdef _KERNEL db_symsplit(symstr, &mod, &sym); if (ksyms_sift(mod, sym, mode) == ENODEV) db_error("invalid symbol table name"); #endif } /* * Find the closest symbol to val, and return its name * and the difference between val and the symbol found. */ db_sym_t db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp) { unsigned int diff; db_sym_t ret = DB_SYM_NULL; #ifdef _KERNEL unsigned long naddr; const char *mod; const char *sym; #endif #ifdef DB_AOUT_SYMBOLS db_expr_t newdiff; db_sym_t ssym; if (using_aout_symtab) { newdiff = diff = ~0; ssym = (*db_symformat->sym_search) (NULL, val, strategy, &newdiff); if ((unsigned int) newdiff < diff) { diff = newdiff; ret = ssym; } *offp = diff; return ret; } #endif #ifdef _KERNEL if (ksyms_getname(&mod, &sym, (vaddr_t)val, strategy) == 0) { (void)ksyms_getval_unlocked(mod, sym, &naddr, KSYMS_ANY); diff = val - (db_addr_t)naddr; ret = (db_sym_t)naddr; } else #endif diff = 0; *offp = diff; return ret; } /* * Return name and value of a symbol */ void db_symbol_values(db_sym_t sym, const char **namep, db_expr_t *valuep) { #ifdef _KERNEL const char *mod; #endif if (sym == DB_SYM_NULL) { *namep = 0; return; } #ifdef DB_AOUT_SYMBOLS if (using_aout_symtab) { db_expr_t value; (*db_symformat->sym_value)(NULL, sym, namep, &value); if (valuep) *valuep = value; return; } #endif #ifdef _KERNEL if (ksyms_getname(&mod, namep, (vaddr_t)sym, KSYMS_ANY|KSYMS_EXACT) == 0) { if (valuep) *valuep = sym; } else #endif *namep = NULL; } /* * Print a the closest symbol to value * * After matching the symbol according to the given strategy * we print it in the name+offset format, provided the symbol's * value is close enough (eg smaller than db_maxoff). * We also attempt to print [filename:linenum] when applicable * (eg for procedure names). * * If we could not find a reasonable name+offset representation, * then we just print the value in hex. Small values might get * bogus symbol associations, e.g. 3 might get some absolute * value like _INCLUDE_VERSION or something, therefore we do * not accept symbols whose value is zero (and use plain hex). * Also, avoid printing as "end+0x????" which is useless. * The variable db_lastsym is used instead of "end" in case we * add support for symbols in loadable driver modules. */ extern char end[]; unsigned long db_lastsym = (unsigned long)end; unsigned int db_maxoff = 0x100000; void db_symstr(char *buf, size_t buflen, db_expr_t off, db_strategy_t strategy) { const char *name; #ifdef _KERNEL const char *mod; unsigned long val; #endif #ifdef DB_AOUT_SYMBOLS if (using_aout_symtab) { db_expr_t d; char *filename; db_expr_t value; int linenum; db_sym_t cursym; if ((unsigned long) off <= db_lastsym) { cursym = db_search_symbol(off, strategy, &d); db_symbol_values(cursym, &name, &value); if (name != NULL && ((unsigned int) d < db_maxoff) && value != 0) { strlcpy(buf, name, buflen); if (d) { strlcat(buf, "+", buflen); db_format_radix(buf+strlen(buf), 24, d, true); } if (strategy == DB_STGY_PROC) { if ((*db_symformat->sym_line_at_pc) (NULL, cursym, &filename, &linenum, off)) snprintf(buf + strlen(buf), buflen - strlen(buf), " [%s:%d]", filename, linenum); } return; } } strlcpy(buf, db_num_to_str(off), buflen); return; } #endif #ifdef _KERNEL if (ksyms_getname(&mod, &name, (vaddr_t)off, strategy|KSYMS_CLOSEST) == 0) { (void)ksyms_getval_unlocked(mod, name, &val, KSYMS_ANY); if (((off - val) < db_maxoff) && val) { snprintf(buf, buflen, "%s:%s", mod, name); if (off - val) { strlcat(buf, "+", buflen); db_format_radix(buf+strlen(buf), 24, off - val, true); } #ifdef notyet if (strategy & KSYMS_PROC) { if (ksyms_fmaddr(off, &filename, &linenum) == 0) snprintf(buf + strlen(buf), buflen - strlen(buf), " [%s:%d]", filename, linenum); } #endif return; } } strlcpy(buf, db_num_to_str(off), buflen); #endif } void db_printsym(db_expr_t off, db_strategy_t strategy, void (*pr)(const char *, ...)) { const char *name; #ifdef _KERNEL const char *mod; unsigned long uval; long val; #endif #ifdef notyet char *filename; int linenum; #endif #ifdef DB_AOUT_SYMBOLS if (using_aout_symtab) { db_expr_t d; char *filename; db_expr_t value; int linenum; db_sym_t cursym; if ((unsigned long) off <= db_lastsym) { cursym = db_search_symbol(off, strategy, &d); db_symbol_values(cursym, &name, &value); if (name != NULL && ((unsigned int) d < db_maxoff) && value != 0) { (*pr)("%s", name); if (d) { char tbuf[24]; db_format_radix(tbuf, 24, d, true); (*pr)("+%s", tbuf); } if (strategy == DB_STGY_PROC) { if ((*db_symformat->sym_line_at_pc) (NULL, cursym, &filename, &linenum, off)) (*pr)(" [%s:%d]", filename, linenum); } return; } } (*pr)(db_num_to_str(off)); return; } #endif #ifdef _KERNEL if (ksyms_getname(&mod, &name, (vaddr_t)off, strategy|KSYMS_CLOSEST) == 0) { (void)ksyms_getval_unlocked(mod, name, &uval, KSYMS_ANY); val = (long) uval; if (((off - val) < db_maxoff) && val) { (*pr)("%s:%s", mod, name); if (off - val) { char tbuf[24]; db_format_radix(tbuf, 24, off - val, true); (*pr)("+%s", tbuf); } #ifdef notyet if (strategy & KSYMS_PROC) { if (ksyms_fmaddr(off, &filename, &linenum) == 0) (*pr)(" [%s:%d]", filename, linenum); } #endif return; } } #endif (*pr)(db_num_to_str(off)); return; } /* * Splits a string in the form "mod:sym" to two strings. */ static void db_symsplit(char *str, char **mod, char **sym) { char *cp; if ((cp = strchr(str, ':')) != NULL) { *cp++ = '\0'; *mod = str; *sym = cp; } else { *mod = NULL; *sym = str; } } bool db_sym_numargs(db_sym_t cursym, int *nargp, char **argnamep) { #ifdef DB_AOUT_SYMBOLS if (using_aout_symtab) return ((*db_symformat->sym_numargs)(NULL, cursym, nargp, argnamep)); #endif return (false); }