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/* $OpenBSD: db_sym.c,v 1.56 2021/07/09 20:59:17 jasper Exp $ */
/* $NetBSD: db_sym.c,v 1.24 2000/08/11 22:50:47 tv 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/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_command.h>
extern char end[];
/*
* 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(void)
{
const char *name = "bsd";
extern char *esym;
#if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
defined(__i386__)
extern char *ssym;
#endif
char *xssym, *xesym;
xesym = esym;
#if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
defined(__i386__)
xssym = ssym;
#else
xssym = (char *)&end;
#endif
/*
* Do this check now for the master symbol table to avoid printing
* the message N times.
*/
if ((((vaddr_t)xssym) & (sizeof(long) - 1)) != 0) {
printf("[ %s symbol table has bad start address %p ]\n",
name, xssym);
return;
}
if (xesym != NULL && xesym != xssym) {
if (db_elf_sym_init((vaddr_t)xesym - (vaddr_t)xssym, xssym,
xesym, name) == 1)
return;
}
printf("[ no symbol table formats found ]\n");
}
int
db_eqname(char *src, char *dst, int c)
{
if (!strcmp(src, dst))
return (1);
if (src[0] == c)
return (!strcmp(src+1,dst));
return (0);
}
/*
* Find the closest symbol to val, and return its name
* and the difference between val and the symbol found.
*/
Elf_Sym *
db_search_symbol(vaddr_t val, db_strategy_t strategy, db_expr_t *offp)
{
unsigned int diff;
db_expr_t newdiff;
Elf_Sym *ret = NULL, *sym;
newdiff = diff = ~0;
sym = db_elf_sym_search(val, strategy, &newdiff);
if (newdiff < diff) {
diff = newdiff;
ret = sym;
}
*offp = diff;
return ret;
}
/*
* Print the closest symbol to a 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.
*/
unsigned long db_lastsym = (unsigned long)end;
unsigned int db_maxoff = 0x10000000;
void
db_printsym(db_expr_t off, db_strategy_t strategy,
int (*pr)(const char *, ...))
{
db_expr_t d;
char *filename;
char *name;
db_expr_t value;
int linenum;
Elf_Sym *cursym;
char buf[DB_FORMAT_BUF_SIZE];
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) {
(*pr)("+%s", db_format(buf, sizeof(buf),
d, DB_FORMAT_R, 1, 0));
}
if (strategy == DB_STGY_PROC) {
if (db_elf_line_at_pc(cursym, &filename,
&linenum, off))
(*pr)(" [%s:%d]", filename, linenum);
}
return;
}
}
(*pr)("%s", db_format(buf, sizeof(buf), off, DB_FORMAT_N, 1, 0));
return;
}
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