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/*-
* 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. 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.
*/
#include <sys/types.h>
#include <a.out.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
getnfile(const char *filename, char ***defaultEs)
{
FILE *nfile;
nfile = fopen( filename ,"r");
if (nfile == NULL)
err(1, "fopen: %s", filename);
fread(&xbuf, 1, sizeof(xbuf), nfile);
if (N_BADMAG(xbuf)) {
/* Bail out and let other binary formats try. */
fclose(nfile);
return (-1);
}
getstrtab(nfile, filename);
getsymtab(nfile, filename);
gettextspace(nfile);
fclose(nfile);
#ifdef DEBUG
if (debug & AOUTDEBUG) {
int j;
for (j = 0; j < nname; j++) {
printf("[getnfile] 0X%08lx\t%s\n", nl[j].value,
nl[j].name);
}
}
#endif
*defaultEs = excludes;
return (0);
}
static void
getstrtab(FILE *nfile, const char *filename)
{
fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), SEEK_SET);
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 %d 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)
{
struct nlist nbuf;
int askfor;
long i;
/* pass1 - count symbols */
fseek(nfile, (long)N_SYMOFF(xbuf), SEEK_SET);
nname = 0;
for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
fread(&nbuf, sizeof(nbuf), 1, nfile);
if (funcsymbol(&nbuf))
nname++;
}
if (nname == 0)
errx(1, "%s: no symbols", filename);
askfor = nname + 1;
nl = 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), SEEK_SET);
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
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
npe++;
nname++;
}
npe->value = -1;
}
/*
* read in the text space of an a.out file
*/
static void
gettextspace(FILE *nfile)
{
if (cflag == 0)
return;
textspace = malloc(xbuf.a_text);
if (textspace == 0) {
warnx("ran out room for %d bytes of text space: can't do -c" ,
xbuf.a_text);
return;
}
(void)fseek(nfile, N_TXTOFF(xbuf), SEEK_SET);
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;
#ifdef sparc
if (nlistp -> n_value & 3)
return (FALSE);
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);
}
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