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/* $OpenBSD: headersize.c,v 1.11 2021/10/24 21:24:22 deraadt Exp $ */
/* $NetBSD: headersize.c,v 1.5 1996/09/23 04:32:59 cgd Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* 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.
*/
#define ELFSIZE 64
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>
#define HDR_BUFSIZE 512
int
main(argc, argv)
int argc;
char *argv[];
{
char buf[HDR_BUFSIZE], *fname;
#ifdef ALPHA_BOOT_ELF
Elf64_Ehdr *elfp;
#endif
int fd;
unsigned long loadaddr;
if (argc != 3)
errx(1, "must be given two arguments (load addr, file name)");
if (sscanf(argv[1], "%lx", &loadaddr) != 1)
errx(1, "load addr argument (%s) not valid", argv[1]);
fname = argv[2];
if ((fd = open(fname, O_RDONLY)) == -1)
err(1, "%s: open failed", fname);
if (read(fd, &buf, HDR_BUFSIZE) != HDR_BUFSIZE)
err(1, "%s: read failed", fname);
#ifdef ALPHA_BOOT_ELF
elfp = (Elf64_Ehdr *)buf;
#endif
#ifdef ALPHA_BOOT_ELF
if (memcmp(ELFMAG, elfp->e_ident, SELFMAG) == 0) {
Elf64_Phdr phdr;
/* XXX assume the first segment is the one we want */
if (lseek(fd, elfp->e_phoff, SEEK_SET) == -1)
err(1, "%s: lseek phdr failed", fname);
if (read(fd, (void *)&phdr, sizeof(phdr)) != sizeof(phdr))
err(1, "%s: read phdr failed", fname);
printf("%ld\n", phdr.p_offset + (loadaddr - phdr.p_vaddr));
}
else
#endif
errx(1, "%s: bad magic number", fname);
close(fd);
exit(0);
}
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