File: [local] / src / sys / ddb / db_sym.c (download)
Revision 1.21, Sat Jul 19 22:31:20 1997 UTC (26 years, 10 months ago) by niklas
Branch: MAIN
CVS Tags: kame_19991208, SMP_BASE, OPENBSD_2_8_BASE, OPENBSD_2_8, OPENBSD_2_7_BASE, OPENBSD_2_7, OPENBSD_2_6_BASE, OPENBSD_2_6, OPENBSD_2_5_BASE, OPENBSD_2_5, OPENBSD_2_4_BASE, OPENBSD_2_4, OPENBSD_2_3_BASE, OPENBSD_2_3, OPENBSD_2_2_BASE, OPENBSD_2_2 Branch point for: SMP
Changes since 1.20: +3 -1 lines
Include vm/vm.h everywhere it is needed to get at boolean_t (I would prefer
to have it in sys/types.h but that is problematic). Some KNF.
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/* $OpenBSD: db_sym.c,v 1.21 1997/07/19 22:31:20 niklas Exp $ */
/* $NetBSD: db_sym.c,v 1.12 1996/02/05 01:57:15 christos Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993,1992,1991,1990 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 Mellon
* the rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <vm/vm.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
*/
static TAILQ_HEAD(, db_symtab) db_symtabs;
static struct db_symtab db_sym_kernel;
size_t db_nsymtabs = 0;
db_symtab_t db_last_symtab;
/*
* Init sym module
*/
void
db_sym_init(void)
{
TAILQ_INIT(&db_symtabs);
}
/*
* Add symbol table, with given name, to list of symbol tables.
*/
int
db_add_symbol_table(start, end, name, ref, rend)
char *start;
char *end;
char *name;
char *ref;
char *rend;
{
db_symtab_t new = db_nsymtabs? NULL : &db_sym_kernel;
if (new == NULL &&
(new = malloc(sizeof(*new), M_DEVBUF, M_WAITOK)) == NULL)
return -1;
new->start = start;
new->end = end;
new->name = name;
new->private = ref;
new->rend = rend;
new->id = db_nsymtabs;
TAILQ_INSERT_TAIL(&db_symtabs, new, list);
return db_nsymtabs++;
}
/*
* Delete a symbol table. Caller is responsible for freeing storage.
*/
void
db_del_symbol_table(name)
char *name;
{
register db_symtab_t p;
for (p = db_symiter(NULL); p != NULL; p = db_symiter(p))
if (!strcmp(name, p->name))
break;
if (p == NULL)
db_printf("ddb: %s symbol table was not allocated", name);
if (--db_nsymtabs == 0)
panic("ddb: kernel symtab delete");
TAILQ_REMOVE(&db_symtabs, p, list);
free(p, M_DEVBUF);
}
db_symtab_t
db_istab(i)
size_t i;
{
register db_symtab_t p;
for (p = db_symiter(NULL); i && p != NULL ; p = db_symiter(p))
i--;
return i? NULL : p;
}
db_symtab_t
db_symiter(st)
db_symtab_t st;
{
if (st == NULL)
st = db_symtabs.tqh_first;
else
st = st->list.tqe_next;
return st;
}
/*
* db_qualify("vm_map", "bsd") returns "bsd:vm_map".
*
* Note: return value points to static data whose content is
* overwritten by each call... but in practice this seems okay.
*/
char *
db_qualify(sym, symtabname)
db_sym_t sym;
register 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);
}
#ifdef DDB
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_symtab_t st = NULL;
db_sym_t sp = NULL;
register char *cp;
/*
* Look for, remove, and remember any symbol table specifier.
*/
for (cp = symstr; *cp; cp++)
if (*cp == ':') {
*cp = '\0';
for (st = db_symiter(NULL);
st != NULL;
st = db_symiter(st))
if (!strcmp(symstr, st->name))
break;
*cp = ':';
if (st == NULL) {
db_error("invalid symbol table name");
/* NOTREACHED */
}
symstr = cp+1;
}
/*
* Look in the specified set of symbol tables.
* Return on first match.
*/
if (st != NULL)
sp = X_db_lookup(st, symstr);
else
for (st = db_symiter(NULL); st != NULL; st = db_symiter(st))
if ((sp = X_db_lookup(st, symstr)) != NULL)
break;
if (sp != NULL && st != NULL)
db_last_symtab = st;
return sp;
}
#endif
/*
* 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 db_symtab_t st;
register
boolean_t found_once = FALSE;
if (!db_qualify_ambiguous_names)
return FALSE;
db_symbol_values(sym, &sym_name, 0);
for (st = db_symiter(NULL); st != NULL; st = db_symiter(st)) {
if (X_db_lookup(st, sym_name) != NULL) {
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
db_expr_t diff;
db_expr_t newdiff;
db_symtab_t st;
db_sym_t ret = DB_SYM_NULL, sym;
newdiff = diff = -1;
db_last_symtab = 0;
for (st = db_symiter(NULL); st != NULL; st = db_symiter(st)) {
sym = X_db_search_symbol(st, val, strategy, &newdiff);
if (newdiff < diff || diff < 0) {
db_last_symtab = st;
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(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[];
u_long db_lastsym = (u_long)end;
db_expr_t 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 ((u_long)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("+%#r", 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);
}
void
db_stub_xh(sym, xh)
db_symtab_t sym;
struct exec *xh;
{
X_db_stub_xh(sym, xh);
}
int
db_symtablen(sym)
db_symtab_t sym;
{
return X_db_symtablen(sym);
}
int
db_symatoff(sym, off, buf, len)
db_symtab_t sym;
int off;
void *buf;
int *len;
{
return X_db_symatoff(sym, off, buf, len);
}