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NetBSD/sys/ddb/db_sym.c

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/* $NetBSD: db_sym.c,v 1.24 2000/08/11 22:50:47 tv 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_lex.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 *));
static db_forall_func_t db_sift;
/*
* 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 **));
void X_db_forall __P((db_symtab_t *,
db_forall_func_t db_forall_func, void *));
/*
* 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 has 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];
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;
int i;
int symtab_start = 0;
int symtab_end = MAXNOSYMTABS;
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;
}
/* 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 X_db_forall(), prints out symbols matching
* criteria.
*/
static void
db_sift(stab, sym, name, suffix, prefix, arg)
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);
}
/*
* "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(symstr, mode)
char *symstr;
int mode;
{
char *cp;
int i;
int symtab_start = 0;
int symtab_end = MAXNOSYMTABS;
struct db_sift_args dsa;
/*
* 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;
}
}
/* Pass args to db_sift(). */
dsa.symstr = symstr;
dsa.mode = mode;
/*
* Look in the specified set of symbol tables.
*/
for (i = symtab_start; i < symtab_end; i++)
if (db_symtabs[i].name) {
db_printf("Sifting table %s:\n", db_symtabs[i].name);
X_db_forall(&db_symtabs[i], db_sift, &dsa);
}
return;
}
/*
* 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;
int i;
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)
db_addr_t val;
db_strategy_t strategy;
db_expr_t *offp;
{
unsigned int diff;
db_expr_t newdiff;
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, pr)
db_expr_t off;
db_strategy_t strategy;
void (*pr) __P((const char *, ...));
{
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) {
(*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_line_at_pc(cursym, &filename, &linenum, off))
(*pr)(" [%s:%d]", filename, linenum);
}
return;
}
}
(*pr)(db_num_to_str(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);
}
void
X_db_forall(stab, db_forall_func, arg)
db_symtab_t *stab;
db_forall_func_t db_forall_func;
void *arg;
{
if (db_symformat != NULL)
(*db_symformat->sym_forall)(stab, db_forall_func, arg);
}
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