freebsd-dev/usr.bin/gprof/elf.c
Bruce Evans 312a529b81 Added missing copyright. Obtain one and a vendor id from gprof.c. aout.c
was split off from gprof.c in rev.1.7 of the latter.  elf.c is mostly new,
but the old copyright sort of applies to it and is better than none.

Use __FBSDID() for the FreeBSD id.
2002-02-21 12:03:06 +00:00

149 lines
4.5 KiB
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("$FreeBSD$");
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <machine/elf.h>
#include <err.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "gprof.h"
static bool wantsym(const Elf_Sym *, const char *);
/* Things which get -E excluded by default. */
static char *excludes[] = { ".mcount", "_mcleanup", NULL };
int
elf_getnfile(const char *filename, char ***defaultEs)
{
int fd;
Elf_Ehdr h;
struct stat s;
void *mapbase;
const char *base;
const Elf_Shdr *shdrs;
const Elf_Shdr *sh_symtab;
const Elf_Shdr *sh_strtab;
const char *strtab;
const Elf_Sym *symtab;
int symtabct;
int i;
if ((fd = open(filename, O_RDONLY)) == -1)
err(1, "%s", filename);
if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) {
close(fd);
return -1;
}
if (fstat(fd, &s) == -1)
err(1, "Cannot fstat %s", filename);
if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) ==
MAP_FAILED)
err(1, "Cannot mmap %s", filename);
close(fd);
base = (const char *)mapbase;
shdrs = (const Elf_Shdr *)(base + h.e_shoff);
/* Find the symbol table and associated string table section. */
for (i = 1; i < h.e_shnum; i++)
if (shdrs[i].sh_type == SHT_SYMTAB)
break;
if (i == h.e_shnum)
errx(1, "%s has no symbol table", filename);
sh_symtab = &shdrs[i];
sh_strtab = &shdrs[sh_symtab->sh_link];
symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset);
symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize;
strtab = (const char *)(base + sh_strtab->sh_offset);
/* Count the symbols that we're interested in. */
nname = 0;
for (i = 1; i < symtabct; i++)
if (wantsym(&symtab[i], strtab))
nname++;
/* Allocate memory for them, plus a terminating entry. */
if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL)
errx(1, "Insufficient memory for symbol table");
/* Read them in. */
npe = nl;
for (i = 1; i < symtabct; i++) {
const Elf_Sym *sym = &symtab[i];
if (wantsym(sym, strtab)) {
npe->value = sym->st_value;
npe->name = strtab + sym->st_name;
npe++;
}
}
npe->value = -1;
*defaultEs = excludes;
return 0;
}
static bool
wantsym(const Elf_Sym *sym, const char *strtab)
{
int type;
int bind;
type = ELF_ST_TYPE(sym->st_info);
bind = ELF_ST_BIND(sym->st_info);
if (type != STT_FUNC ||
(aflag && bind == STB_LOCAL) ||
(uflag && strchr(strtab + sym->st_name, '.') != NULL))
return 0;
return 1;
}