FreeBSD-5.3/usr.bin/gprof/aout.c
/*-
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
/* From: */
#ifndef lint
static char sccsid[] = "@(#)gprof.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/gprof/aout.c,v 1.7 2004/06/20 11:05:25 stefanf Exp $");
#include <netinet/in.h>
#include <a.out.h>
#include <err.h>
#include "gprof.h"
static void getstrtab(FILE *, const char *);
static void getsymtab(FILE *, const char *);
static void gettextspace(FILE *);
static bool funcsymbol(struct nlist *);
static char *strtab; /* string table in core */
static long ssiz; /* size of the string table */
static struct exec xbuf; /* exec header of a.out */
/* Things which get -E excluded by default. */
static char *excludes[] = { "mcount", "__mcleanup", NULL };
/*
* Set up string and symbol tables from a.out.
* and optionally the text space.
* On return symbol table is sorted by value.
*
* Returns 0 on success, -1 on failure.
*/
int
aout_getnfile(const char *filename, char ***defaultEs)
{
FILE *nfile;
int valcmp();
nfile = fopen( filename ,"r");
if (nfile == NULL)
err( 1 , "%s", filename );
fread(&xbuf, 1, sizeof(xbuf), nfile);
if (N_BADMAG(xbuf)) {
fclose(nfile);
return -1;
}
getstrtab(nfile, filename);
getsymtab(nfile, filename);
gettextspace( nfile );
fclose(nfile);
# ifdef DEBUG
if ( debug & AOUTDEBUG ) {
register int j;
for (j = 0; j < nname; j++){
printf("[getnfile] 0X%08lx\t%s\n", nl[j].value, nl[j].name);
}
}
# endif /* DEBUG */
*defaultEs = excludes;
return 0;
}
static void
getstrtab(FILE *nfile, const char *filename)
{
fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0);
if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0)
errx( 1 , "%s: no string table (old format?)" , filename );
strtab = calloc(ssiz, 1);
if (strtab == NULL)
errx( 1 , "%s: no room for %ld bytes of string table", filename , ssiz);
if (fread(strtab+sizeof(ssiz), ssiz-sizeof(ssiz), 1, nfile) != 1)
errx( 1 , "%s: error reading string table" , filename );
}
/*
* Read in symbol table
*/
static void
getsymtab(FILE *nfile, const char *filename)
{
register long i;
int askfor;
struct nlist nbuf;
/* pass1 - count symbols */
fseek(nfile, (long)N_SYMOFF(xbuf), 0);
nname = 0;
for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
fread(&nbuf, sizeof(nbuf), 1, nfile);
if ( ! funcsymbol( &nbuf ) ) {
continue;
}
nname++;
}
if (nname == 0)
errx( 1 , "%s: no symbols" , filename );
askfor = nname + 1;
nl = (nltype *) calloc( askfor , sizeof(nltype) );
if (nl == 0)
errx( 1 , "no room for %d bytes of symbol table" ,
askfor * sizeof(nltype) );
/* pass2 - read symbols */
fseek(nfile, (long)N_SYMOFF(xbuf), 0);
npe = nl;
nname = 0;
for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
fread(&nbuf, sizeof(nbuf), 1, nfile);
if ( ! funcsymbol( &nbuf ) ) {
# ifdef DEBUG
if ( debug & AOUTDEBUG ) {
printf( "[getsymtab] rejecting: 0x%x %s\n" ,
nbuf.n_type , strtab + nbuf.n_un.n_strx );
}
# endif /* DEBUG */
continue;
}
npe->value = nbuf.n_value;
npe->name = strtab+nbuf.n_un.n_strx;
# ifdef DEBUG
if ( debug & AOUTDEBUG ) {
printf( "[getsymtab] %d %s 0x%08lx\n" ,
nname , npe -> name , npe -> value );
}
# endif /* DEBUG */
npe++;
nname++;
}
npe->value = -1;
}
/*
* read in the text space of an a.out file
*/
static void
gettextspace(FILE *nfile)
{
textspace = (u_char *) malloc( xbuf.a_text );
if ( textspace == 0 ) {
warnx("no room for %lu bytes of text space: can't do -c" ,
xbuf.a_text );
return;
}
(void) fseek( nfile , N_TXTOFF( xbuf ) , 0 );
if ( fread( textspace , 1 , xbuf.a_text , nfile ) != xbuf.a_text ) {
warnx("couldn't read text space: can't do -c");
free( textspace );
textspace = 0;
return;
}
}
static bool
funcsymbol(struct nlist *nlistp)
{
char *name, c;
/*
* must be a text symbol,
* and static text symbols don't qualify if aflag set.
*/
if ( ! ( ( nlistp -> n_type == ( N_TEXT | N_EXT ) )
|| ( ( nlistp -> n_type == N_TEXT ) && ( aflag == 0 ) ) ) ) {
return FALSE;
}
/*
* name must start with an underscore if uflag is set.
* can't have any `funny' characters in name,
* where `funny' means `.' (.o file names)
* need to make an exception for sparc .mul & co.
* perhaps we should just drop this code entirely...
*/
name = strtab + nlistp -> n_un.n_strx;
if ( uflag && *name != '_' )
return FALSE;
#ifdef sparc
if ( *name == '.' ) {
char *p = name + 1;
if ( *p == 'u' )
p++;
if ( strcmp ( p, "mul" ) == 0 || strcmp ( p, "div" ) == 0 ||
strcmp ( p, "rem" ) == 0 )
return TRUE;
}
#endif
while ( (c = *name++) ) {
if ( c == '.' ) {
return FALSE;
}
}
return TRUE;
}