331 lines
7.0 KiB
C
331 lines
7.0 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: db_sym.c,v 1.6 1994/08/20 03:48:26 davidg Exp $
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <ddb/ddb.h>
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#include <ddb/db_sym.h>
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/*
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* We import from the symbol-table dependent routines:
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*/
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extern db_sym_t X_db_lookup();
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extern db_sym_t X_db_search_symbol();
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extern boolean_t X_db_line_at_pc();
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extern void X_db_symbol_values();
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/*
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* Multiple symbol tables
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*/
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#ifndef MAXNOSYMTABS
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#define MAXNOSYMTABS 3 /* mach, ux, emulator */
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#endif
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db_symtab_t db_symtabs[MAXNOSYMTABS] = {{0,},};
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int db_nsymtab = 0;
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db_symtab_t *db_last_symtab;
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db_sym_t db_lookup(); /* forward */
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/*
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* Add symbol table, with given name, to list of symbol tables.
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*/
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void
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db_add_symbol_table(start, end, name, ref)
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char *start;
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char *end;
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char *name;
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char *ref;
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{
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if (db_nsymtab >= MAXNOSYMTABS) {
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printf ("No slots left for %s symbol table", name);
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panic ("db_sym.c: db_add_symbol_table");
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}
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db_symtabs[db_nsymtab].start = start;
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db_symtabs[db_nsymtab].end = end;
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db_symtabs[db_nsymtab].name = name;
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db_symtabs[db_nsymtab].private = ref;
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db_nsymtab++;
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}
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/*
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* db_qualify("vm_map", "ux") returns "unix:vm_map".
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*
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* Note: return value points to static data whose content is
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* overwritten by each call... but in practice this seems okay.
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*/
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static char *
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db_qualify(sym, symtabname)
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db_sym_t sym;
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register char *symtabname;
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{
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char *symname;
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static char tmp[256];
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db_symbol_values(sym, &symname, 0);
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strcpy(tmp,symtabname);
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strcat(tmp,":");
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strcat(tmp,symname);
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return tmp;
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}
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boolean_t
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db_eqname(src, dst, c)
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char *src;
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char *dst;
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char c;
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{
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if (!strcmp(src, dst))
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return (TRUE);
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if (src[0] == c)
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return (!strcmp(src+1,dst));
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return (FALSE);
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}
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boolean_t
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db_value_of_name(name, valuep)
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char *name;
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db_expr_t *valuep;
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{
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db_sym_t sym;
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sym = db_lookup(name);
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if (sym == DB_SYM_NULL)
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return (FALSE);
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db_symbol_values(sym, &name, valuep);
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return (TRUE);
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}
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/*
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* Lookup a symbol.
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* If the symbol has a qualifier (e.g., ux:vm_map),
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* then only the specified symbol table will be searched;
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* otherwise, all symbol tables will be searched.
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*/
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db_sym_t
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db_lookup(symstr)
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char *symstr;
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{
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db_sym_t sp;
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register int i;
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int symtab_start = 0;
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int symtab_end = db_nsymtab;
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register char *cp;
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/*
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* Look for, remove, and remember any symbol table specifier.
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*/
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for (cp = symstr; *cp; cp++) {
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if (*cp == ':') {
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*cp = '\0';
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for (i = 0; i < db_nsymtab; i++) {
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if (! strcmp(symstr, db_symtabs[i].name)) {
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symtab_start = i;
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symtab_end = i + 1;
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break;
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}
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}
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*cp = ':';
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if (i == db_nsymtab) {
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db_error("invalid symbol table name");
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}
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symstr = cp+1;
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}
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}
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/*
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* Look in the specified set of symbol tables.
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* Return on first match.
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*/
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for (i = symtab_start; i < symtab_end; i++) {
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sp = X_db_lookup(&db_symtabs[i], symstr);
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if (sp) {
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db_last_symtab = &db_symtabs[i];
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return sp;
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}
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}
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return 0;
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}
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/*
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* Does this symbol name appear in more than one symbol table?
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* Used by db_symbol_values to decide whether to qualify a symbol.
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*/
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boolean_t db_qualify_ambiguous_names = FALSE;
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boolean_t
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db_symbol_is_ambiguous(sym)
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db_sym_t sym;
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{
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char *sym_name;
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register int i;
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register
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boolean_t found_once = FALSE;
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if (!db_qualify_ambiguous_names)
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return FALSE;
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db_symbol_values(sym, &sym_name, 0);
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for (i = 0; i < db_nsymtab; i++) {
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if (X_db_lookup(&db_symtabs[i], sym_name)) {
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if (found_once)
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return TRUE;
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found_once = TRUE;
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}
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}
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return FALSE;
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}
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/*
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* Find the closest symbol to val, and return its name
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* and the difference between val and the symbol found.
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*/
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db_sym_t
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db_search_symbol( val, strategy, offp)
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register db_addr_t val;
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db_strategy_t strategy;
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db_expr_t *offp;
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{
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register
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unsigned int diff;
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unsigned int newdiff;
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register int i;
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db_sym_t ret = DB_SYM_NULL, sym;
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newdiff = diff = ~0;
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db_last_symtab = 0;
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for (i = 0; i < db_nsymtab; i++) {
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sym = X_db_search_symbol(&db_symtabs[i], val, strategy, &newdiff);
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if (newdiff < diff) {
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db_last_symtab = &db_symtabs[i];
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diff = newdiff;
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ret = sym;
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}
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}
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*offp = diff;
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return ret;
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}
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/*
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* Return name and value of a symbol
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*/
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void
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db_symbol_values(sym, namep, valuep)
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db_sym_t sym;
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char **namep;
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db_expr_t *valuep;
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{
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db_expr_t value;
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if (sym == DB_SYM_NULL) {
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*namep = 0;
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return;
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}
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X_db_symbol_values(sym, namep, &value);
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if (db_symbol_is_ambiguous(sym))
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*namep = db_qualify(sym, db_last_symtab->name);
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if (valuep)
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*valuep = value;
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}
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/*
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* Print a the closest symbol to value
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*
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* After matching the symbol according to the given strategy
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* we print it in the name+offset format, provided the symbol's
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* value is close enough (eg smaller than db_maxoff).
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* We also attempt to print [filename:linenum] when applicable
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* (eg for procedure names).
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*
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* If we could not find a reasonable name+offset representation,
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* then we just print the value in hex. Small values might get
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* bogus symbol associations, e.g. 3 might get some absolute
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* value like _INCLUDE_VERSION or something, therefore we do
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* not accept symbols whose value is zero (and use plain hex).
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*/
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unsigned int db_maxoff = 0x10000000;
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void
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db_printsym(off, strategy)
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db_expr_t off;
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db_strategy_t strategy;
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{
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db_expr_t d;
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char *filename;
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char *name;
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db_expr_t value;
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int linenum;
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db_sym_t cursym;
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cursym = db_search_symbol(off, strategy, &d);
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db_symbol_values(cursym, &name, &value);
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if (name == 0 || d >= db_maxoff || value == 0) {
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db_printf("%#n", off);
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return;
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}
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db_printf("%s", name);
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if (d)
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db_printf("+%#r", d);
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if (strategy == DB_STGY_PROC) {
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if (db_line_at_pc(cursym, &filename, &linenum, off))
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db_printf(" [%s:%d]", filename, linenum);
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}
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}
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boolean_t
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db_line_at_pc( sym, filename, linenum, pc)
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db_sym_t sym;
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char **filename;
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int *linenum;
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db_expr_t pc;
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{
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return X_db_line_at_pc( db_last_symtab, sym, filename, linenum, pc);
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}
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int
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db_sym_numargs(sym, nargp, argnames)
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db_sym_t sym;
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int *nargp;
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char **argnames;
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{
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return X_db_sym_numargs(db_last_symtab, sym, nargp, argnames);
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}
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