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