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NetBSD/sys/ddb/db_aout.c

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/* $NetBSD: db_aout.c,v 1.26 1999/06/15 00:23:19 thorpej 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/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <machine/db_machdep.h> /* data types */
#include <ddb/db_sym.h>
#include <ddb/db_output.h>
#include <ddb/db_extern.h>
#ifdef DB_AOUT_SYMBOLS
#include <ddb/db_aout.h>
boolean_t db_aout_sym_init __P((int, void *, void *, const char *));
db_sym_t db_aout_lookup __P((db_symtab_t *, char *));
db_sym_t db_aout_search_symbol __P((db_symtab_t *, db_addr_t,
db_strategy_t, db_expr_t *));
void db_aout_symbol_values __P((db_symtab_t *, db_sym_t,
char **, db_expr_t *));
boolean_t db_aout_line_at_pc __P((db_symtab_t *, db_sym_t,
char **, int *, db_expr_t));
boolean_t db_aout_sym_numargs __P((db_symtab_t *, db_sym_t, int *,
char **));
db_symformat_t db_symformat_aout = {
"a.out",
db_aout_sym_init,
db_aout_lookup,
db_aout_search_symbol,
db_aout_symbol_values,
db_aout_line_at_pc,
db_aout_sym_numargs,
};
/*
* An a.out symbol table as loaded into the kernel debugger:
*
* symtab -> size of symbol entries, in bytes
* sp -> first symbol entry
* ...
* ep -> last symbol entry + 1
* strtab == start of string table
* size of string table in bytes,
* including this word
* -> strings
*/
/*
* Find the symbol table and strings; tell ddb about them.
*/
boolean_t
db_aout_sym_init(symsize, vsymtab, vesymtab, name)
int symsize; /* size of symbol table */
void *vsymtab; /* pointer to start of symbol table */
void *vesymtab; /* pointer to end of string table,
for checking - rounded up to integer
boundary */
const char *name;
{
register struct nlist *sym_start, *sym_end;
register struct nlist *sp;
register char *strtab;
register int slen, bad = 0;
char *estrtab;
if (ALIGNED_POINTER(vsymtab, long) == 0) {
printf("[ %s symbol table has bad start address %p ]\n",
name, vsymtab);
return (FALSE);
}
/*
* Find pointers to the start and end of the symbol entries,
* given a pointer to the start of the symbol table.
*/
sym_start = (struct nlist *)vsymtab;
sym_end = (struct nlist *)((char *)sym_start + symsize);
strtab = (char *)sym_end;
if (ALIGNED_POINTER(strtab, int) == 0) {
printf("[ %s symbol table has bad string table address %p ]\n",
name, strtab);
return (FALSE);
}
slen = *(int *)strtab;
estrtab = strtab + slen;
#define round_to_size(x) \
(((vaddr_t)(x) + sizeof(vsize_t) - 1) & ~(sizeof(vsize_t) - 1))
if (round_to_size(estrtab) != round_to_size(vesymtab)) {
printf("[ %s a.out symbol table not valid ]\n", name);
return (FALSE);
}
#undef round_to_size
for (sp = sym_start; sp < sym_end; sp++) {
register int strx;
strx = sp->n_un.n_strx;
if (strx != 0) {
if (strx > slen) {
printf("[ %s has bad a.out string table index (0x%x) ]\n",
name, strx);
sp->n_un.n_name = 0;
bad = 1;
continue;
}
sp->n_un.n_name = strtab + strx;
}
}
if (bad)
return (FALSE);
if (db_add_symbol_table((char *)sym_start, (char *)sym_end, name,
NULL) != -1) {
printf("[ preserving %ld bytes of %s a.out symbol table ]\n",
(long)vesymtab - (long)vsymtab, name);
return (TRUE);
}
return (FALSE);
}
db_sym_t
db_aout_lookup(stab, symstr)
db_symtab_t *stab;
char * symstr;
{
register struct nlist *sp, *ep;
sp = (struct nlist *)stab->start;
ep = (struct nlist *)stab->end;
for (; sp < ep; sp++) {
if (sp->n_un.n_name == 0)
continue;
if ((sp->n_type & N_STAB) == 0 &&
sp->n_un.n_name != 0 &&
db_eqname(sp->n_un.n_name, symstr, '_'))
{
return ((db_sym_t)sp);
}
}
return ((db_sym_t)0);
}
db_sym_t
db_aout_search_symbol(symtab, off, strategy, diffp)
db_symtab_t * symtab;
register
db_addr_t off;
db_strategy_t strategy;
db_expr_t *diffp; /* in/out */
{
register unsigned int diff = *diffp;
register struct nlist *symp = 0;
register struct nlist *sp, *ep;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
for (; sp < ep; sp++) {
if (sp->n_un.n_name == 0)
continue;
if ((sp->n_type & N_STAB) != 0 || (sp->n_type & N_TYPE) == N_FN)
continue;
if (off >= sp->n_value) {
if (off - sp->n_value < diff) {
diff = off - sp->n_value;
symp = sp;
if (diff == 0 &&
((strategy == DB_STGY_PROC &&
sp->n_type == (N_TEXT|N_EXT)) ||
(strategy == DB_STGY_ANY &&
(sp->n_type & N_EXT))))
break;
}
else if (off - sp->n_value == diff) {
if (symp == 0)
symp = sp;
else if ((symp->n_type & N_EXT) == 0 &&
(sp->n_type & N_EXT) != 0)
symp = sp; /* pick the external symbol */
}
}
}
if (symp == 0) {
*diffp = off;
}
else {
*diffp = diff;
}
return ((db_sym_t)symp);
}
/*
* Return the name and value for a symbol.
*/
void
db_aout_symbol_values(symtab, sym, namep, valuep)
db_symtab_t *symtab;
db_sym_t sym;
char **namep;
db_expr_t *valuep;
{
register struct nlist *sp;
sp = (struct nlist *)sym;
if (namep)
*namep = sp->n_un.n_name;
if (valuep)
*valuep = sp->n_value;
}
boolean_t
db_aout_line_at_pc(symtab, cursym, filename, linenum, off)
db_symtab_t * symtab;
db_sym_t cursym;
char **filename;
int *linenum;
db_expr_t off;
{
register struct nlist *sp, *ep;
unsigned long sodiff = -1UL, lndiff = -1UL, ln = 0;
char *fname = NULL;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
/* XXX - gcc specific */
#define NEWSRC(str) ((str) != NULL && \
(str)[0] == 'g' && strcmp((str), "gcc_compiled.") == 0)
for (; sp < ep; sp++) {
/*
* Prevent bogus linenumbers in case module not compiled
* with debugging options
*/
#if 0
if (sp->n_value <= off && (off - sp->n_value) <= sodiff &&
NEWSRC(sp->n_un.n_name)) {
#endif
if ((sp->n_type & N_TYPE) == N_FN || NEWSRC(sp->n_un.n_name)) {
sodiff = lndiff = -1UL;
ln = 0;
fname = NULL;
}
if (sp->n_type == N_SO) {
if (sp->n_value <= off && (off - sp->n_value) < sodiff) {
sodiff = off - sp->n_value;
fname = sp->n_un.n_name;
}
continue;
}
if (sp->n_type != N_SLINE)
continue;
if (sp->n_value > off)
break;
if (off - sp->n_value < lndiff) {
lndiff = off - sp->n_value;
ln = sp->n_desc;
}
}
if (fname != NULL && ln != 0) {
*filename = fname;
*linenum = ln;
return TRUE;
}
return (FALSE);
}
boolean_t
db_aout_sym_numargs(symtab, cursym, nargp, argnamep)
db_symtab_t * symtab;
db_sym_t cursym;
int *nargp;
char **argnamep;
{
register struct nlist *sp, *ep;
u_long addr;
int maxnarg = *nargp, nargs = 0;
if (cursym == NULL)
return FALSE;
addr = ((struct nlist *)cursym)->n_value;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
for (; sp < ep; sp++) {
if (sp->n_type == N_FUN && sp->n_value == addr) {
while (++sp < ep && sp->n_type == N_PSYM) {
if (nargs >= maxnarg)
break;
nargs++;
*argnamep++ = sp->n_un.n_name?sp->n_un.n_name:"???";
{
/* XXX - remove trailers */
char *cp = *(argnamep-1);
while (*cp != '\0' && *cp != ':') cp++;
if (*cp == ':') *cp = '\0';
}
}
*nargp = nargs;
return TRUE;
}
}
return FALSE;
}
#endif /* DB_AOUT_SYMBOLS */
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