519 lines
11 KiB
C
519 lines
11 KiB
C
/* $NetBSD: db_sym.c,v 1.17 1999/04/12 20:38:21 pk 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 <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <machine/db_machdep.h>
|
|
|
|
#include <ddb/db_sym.h>
|
|
#include <ddb/db_output.h>
|
|
#include <ddb/db_extern.h>
|
|
#include <ddb/db_command.h>
|
|
|
|
/*
|
|
* Multiple symbol tables
|
|
*/
|
|
#ifndef MAXLKMS
|
|
#define MAXLKMS 20
|
|
#endif
|
|
|
|
#ifndef MAXNOSYMTABS
|
|
#define MAXNOSYMTABS MAXLKMS+1 /* Room for kernel + LKM's */
|
|
#endif
|
|
|
|
db_symtab_t db_symtabs[MAXNOSYMTABS] = {{0,},};
|
|
|
|
db_symtab_t *db_last_symtab;
|
|
|
|
static char *db_qualify __P((db_sym_t, const char *));
|
|
|
|
/*
|
|
* Put the most picky symbol table formats at the top!
|
|
*/
|
|
const db_symformat_t *db_symformats[] = {
|
|
#ifdef DB_ELF_SYMBOLS
|
|
&db_symformat_elf,
|
|
#endif
|
|
#ifdef DB_AOUT_SYMBOLS
|
|
&db_symformat_aout,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
const db_symformat_t *db_symformat;
|
|
|
|
boolean_t X_db_sym_init __P((int, void *, void *, const char *));
|
|
db_sym_t X_db_lookup __P((db_symtab_t *, char *));
|
|
db_sym_t X_db_search_symbol __P((db_symtab_t *, db_addr_t,
|
|
db_strategy_t, db_expr_t *));
|
|
void X_db_symbol_values __P((db_symtab_t *, db_sym_t, char **,
|
|
db_expr_t *));
|
|
boolean_t X_db_line_at_pc __P((db_symtab_t *, db_sym_t, char **,
|
|
int *, db_expr_t));
|
|
int X_db_sym_numargs __P((db_symtab_t *, db_sym_t, int *,
|
|
char **));
|
|
|
|
/*
|
|
* 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(symsize, vss, vse)
|
|
int symsize;
|
|
void *vss, *vse;
|
|
{
|
|
const db_symformat_t **symf;
|
|
const char *name = "netbsd";
|
|
|
|
if (symsize <= 0) {
|
|
printf(" [ no symbols available ]\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Do this check now for the master symbol table to avoid printing
|
|
* the message N times.
|
|
*/
|
|
if (ALIGNED_POINTER(vss, long) == 0) {
|
|
printf("[ %s symbol table nas bad start address %p ]\n",
|
|
name, vss);
|
|
return;
|
|
}
|
|
|
|
for (symf = db_symformats; *symf != NULL; symf++) {
|
|
db_symformat = *symf;
|
|
if (X_db_sym_init(symsize, vss, vse, name) == TRUE)
|
|
return;
|
|
}
|
|
|
|
db_symformat = NULL;
|
|
printf("[ no symbol table formats found ]\n");
|
|
}
|
|
|
|
/*
|
|
* Add symbol table, with given name, to list of symbol tables.
|
|
*/
|
|
int
|
|
db_add_symbol_table(start, end, name, ref)
|
|
char *start;
|
|
char *end;
|
|
const char *name;
|
|
char *ref;
|
|
{
|
|
int slot;
|
|
|
|
for (slot = 0; slot < MAXNOSYMTABS; slot++) {
|
|
if (db_symtabs[slot].name == NULL)
|
|
break;
|
|
}
|
|
if (slot >= MAXNOSYMTABS) {
|
|
db_printf("No slots left for %s symbol table", name);
|
|
return(-1);
|
|
}
|
|
|
|
db_symtabs[slot].start = start;
|
|
db_symtabs[slot].end = end;
|
|
db_symtabs[slot].name = name;
|
|
db_symtabs[slot].private = ref;
|
|
|
|
return(slot);
|
|
}
|
|
|
|
/*
|
|
* Delete a symbol table. Caller is responsible for freeing storage.
|
|
*/
|
|
void
|
|
db_del_symbol_table(name)
|
|
char *name;
|
|
{
|
|
int slot;
|
|
|
|
for (slot = 0; slot < MAXNOSYMTABS; slot++) {
|
|
if (db_symtabs[slot].name &&
|
|
! strcmp(db_symtabs[slot].name, name))
|
|
break;
|
|
}
|
|
if (slot >= MAXNOSYMTABS) {
|
|
db_printf("Unable to find symbol table slot for %s.", name);
|
|
return;
|
|
}
|
|
|
|
db_symtabs[slot].start = 0;
|
|
db_symtabs[slot].end = 0;
|
|
db_symtabs[slot].name = 0;
|
|
db_symtabs[slot].private = 0;
|
|
}
|
|
|
|
/*
|
|
* db_qualify("vm_map", "netbsd") returns "netbsd:vm_map".
|
|
*
|
|
* Note: return value points to static data whose content is
|
|
* overwritten by each call... but in practice this seems okay.
|
|
*/
|
|
static char *
|
|
db_qualify(sym, symtabname)
|
|
db_sym_t sym;
|
|
const char *symtabname;
|
|
{
|
|
char *symname;
|
|
static char tmp[256];
|
|
register char *s;
|
|
|
|
db_symbol_values(sym, &symname, 0);
|
|
s = tmp;
|
|
while ((*s++ = *symtabname++) != '\0')
|
|
;
|
|
s[-1] = ':';
|
|
while ((*s++ = *symname++) != '\0')
|
|
;
|
|
return tmp;
|
|
}
|
|
|
|
|
|
boolean_t
|
|
db_eqname(src, dst, c)
|
|
char *src;
|
|
char *dst;
|
|
int c;
|
|
{
|
|
if (!strcmp(src, dst))
|
|
return (TRUE);
|
|
if (src[0] == c)
|
|
return (!strcmp(src+1,dst));
|
|
return (FALSE);
|
|
}
|
|
|
|
boolean_t
|
|
db_value_of_name(name, valuep)
|
|
char *name;
|
|
db_expr_t *valuep;
|
|
{
|
|
db_sym_t sym;
|
|
|
|
sym = db_lookup(name);
|
|
if (sym == DB_SYM_NULL)
|
|
return (FALSE);
|
|
db_symbol_values(sym, &name, valuep);
|
|
return (TRUE);
|
|
}
|
|
|
|
|
|
/*
|
|
* Lookup a symbol.
|
|
* 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.
|
|
*/
|
|
db_sym_t
|
|
db_lookup(symstr)
|
|
char *symstr;
|
|
{
|
|
db_sym_t sp;
|
|
register int i;
|
|
int symtab_start = 0;
|
|
int symtab_end = MAXNOSYMTABS;
|
|
register char *cp;
|
|
|
|
/*
|
|
* Look for, remove, and remember any symbol table specifier.
|
|
*/
|
|
for (cp = symstr; *cp; cp++) {
|
|
if (*cp == ':') {
|
|
*cp = '\0';
|
|
for (i = 0; i < MAXNOSYMTABS; i++) {
|
|
if (db_symtabs[i].name &&
|
|
! strcmp(symstr, db_symtabs[i].name)) {
|
|
symtab_start = i;
|
|
symtab_end = i + 1;
|
|
break;
|
|
}
|
|
}
|
|
*cp = ':';
|
|
if (i == MAXNOSYMTABS) {
|
|
db_error("invalid symbol table name");
|
|
/*NOTREACHED*/
|
|
}
|
|
symstr = cp+1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Look in the specified set of symbol tables.
|
|
* Return on first match.
|
|
*/
|
|
for (i = symtab_start; i < symtab_end; i++) {
|
|
if (db_symtabs[i].name &&
|
|
(sp = X_db_lookup(&db_symtabs[i], symstr))) {
|
|
db_last_symtab = &db_symtabs[i];
|
|
return sp;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Does this symbol name appear in more than one symbol table?
|
|
* Used by db_symbol_values to decide whether to qualify a symbol.
|
|
*/
|
|
boolean_t db_qualify_ambiguous_names = FALSE;
|
|
|
|
boolean_t
|
|
db_symbol_is_ambiguous(sym)
|
|
db_sym_t sym;
|
|
{
|
|
char *sym_name;
|
|
register int i;
|
|
register
|
|
boolean_t found_once = FALSE;
|
|
|
|
if (!db_qualify_ambiguous_names)
|
|
return FALSE;
|
|
|
|
db_symbol_values(sym, &sym_name, 0);
|
|
for (i = 0; i < MAXNOSYMTABS; i++) {
|
|
if (db_symtabs[i].name &&
|
|
X_db_lookup(&db_symtabs[i], sym_name)) {
|
|
if (found_once)
|
|
return TRUE;
|
|
found_once = TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* 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( val, strategy, offp)
|
|
register db_addr_t val;
|
|
db_strategy_t strategy;
|
|
db_expr_t *offp;
|
|
{
|
|
register
|
|
unsigned int diff;
|
|
db_expr_t newdiff;
|
|
register int i;
|
|
db_sym_t ret = DB_SYM_NULL, sym;
|
|
|
|
newdiff = diff = ~0;
|
|
db_last_symtab = 0;
|
|
for (i = 0; i < MAXNOSYMTABS; i++) {
|
|
if (!db_symtabs[i].name)
|
|
continue;
|
|
sym = X_db_search_symbol(&db_symtabs[i], val, strategy, &newdiff);
|
|
if (newdiff < diff) {
|
|
db_last_symtab = &db_symtabs[i];
|
|
diff = newdiff;
|
|
ret = sym;
|
|
}
|
|
}
|
|
*offp = diff;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Return name and value of a symbol
|
|
*/
|
|
void
|
|
db_symbol_values(sym, namep, valuep)
|
|
db_sym_t sym;
|
|
char **namep;
|
|
db_expr_t *valuep;
|
|
{
|
|
db_expr_t value;
|
|
|
|
if (sym == DB_SYM_NULL) {
|
|
*namep = 0;
|
|
return;
|
|
}
|
|
|
|
X_db_symbol_values(db_last_symtab, sym, namep, &value);
|
|
|
|
if (db_symbol_is_ambiguous(sym))
|
|
*namep = db_qualify(sym, db_last_symtab->name);
|
|
if (valuep)
|
|
*valuep = value;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 = 0x10000000;
|
|
|
|
|
|
void
|
|
db_printsym(off, strategy)
|
|
db_expr_t off;
|
|
db_strategy_t strategy;
|
|
{
|
|
db_expr_t d;
|
|
char *filename;
|
|
char *name;
|
|
db_expr_t value;
|
|
int linenum;
|
|
db_sym_t cursym;
|
|
|
|
if (off <= db_lastsym) {
|
|
cursym = db_search_symbol(off, strategy, &d);
|
|
db_symbol_values(cursym, &name, &value);
|
|
if (name && (d < db_maxoff) && value) {
|
|
db_printf("%s", name);
|
|
if (d)
|
|
db_printf("+%#lr", d);
|
|
if (strategy == DB_STGY_PROC) {
|
|
if (db_line_at_pc(cursym, &filename, &linenum, off))
|
|
db_printf(" [%s:%d]", filename, linenum);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
db_printf("%#ln", off);
|
|
return;
|
|
}
|
|
|
|
|
|
boolean_t
|
|
db_line_at_pc( sym, filename, linenum, pc)
|
|
db_sym_t sym;
|
|
char **filename;
|
|
int *linenum;
|
|
db_expr_t pc;
|
|
{
|
|
return X_db_line_at_pc( db_last_symtab, sym, filename, linenum, pc);
|
|
}
|
|
|
|
int
|
|
db_sym_numargs(sym, nargp, argnames)
|
|
db_sym_t sym;
|
|
int *nargp;
|
|
char **argnames;
|
|
{
|
|
return X_db_sym_numargs(db_last_symtab, sym, nargp, argnames);
|
|
}
|
|
|
|
boolean_t
|
|
X_db_sym_init(symsize, vss, vse, name)
|
|
int symsize;
|
|
void *vss, *vse;
|
|
const char *name;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
return ((*db_symformat->sym_init)(symsize, vss, vse, name));
|
|
return (FALSE);
|
|
}
|
|
|
|
db_sym_t
|
|
X_db_lookup(stab, symstr)
|
|
db_symtab_t *stab;
|
|
char *symstr;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
return ((*db_symformat->sym_lookup)(stab, symstr));
|
|
return ((db_sym_t)0);
|
|
}
|
|
|
|
db_sym_t
|
|
X_db_search_symbol(stab, off, strategy, diffp)
|
|
db_symtab_t *stab;
|
|
db_addr_t off;
|
|
db_strategy_t strategy;
|
|
db_expr_t *diffp;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
return ((*db_symformat->sym_search)(stab, off, strategy,
|
|
diffp));
|
|
return ((db_sym_t)0);
|
|
}
|
|
|
|
void
|
|
X_db_symbol_values(stab, sym, namep, valuep)
|
|
db_symtab_t *stab;
|
|
db_sym_t sym;
|
|
char **namep;
|
|
db_expr_t *valuep;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
(*db_symformat->sym_value)(stab, sym, namep, valuep);
|
|
}
|
|
|
|
boolean_t
|
|
X_db_line_at_pc(stab, cursym, filename, linenum, off)
|
|
db_symtab_t *stab;
|
|
db_sym_t cursym;
|
|
char **filename;
|
|
int *linenum;
|
|
db_expr_t off;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
return ((*db_symformat->sym_line_at_pc)(stab, cursym,
|
|
filename, linenum, off));
|
|
return (FALSE);
|
|
}
|
|
|
|
boolean_t
|
|
X_db_sym_numargs(stab, cursym, nargp, argnamep)
|
|
db_symtab_t *stab;
|
|
db_sym_t cursym;
|
|
int *nargp;
|
|
char **argnamep;
|
|
{
|
|
|
|
if (db_symformat != NULL)
|
|
return ((*db_symformat->sym_numargs)(stab, cursym, nargp,
|
|
argnamep));
|
|
return (FALSE);
|
|
}
|