85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* $NetBSD: headersize.c,v 1.5 1996/09/23 04:32:59 cgd Exp $ */
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/*
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* Copyright (c) 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#define ELFSIZE 64
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <sys/exec.h>
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#include <sys/exec_ecoff.h>
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#include <sys/exec_elf.h>
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#include <unistd.h>
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#include <stdio.h>
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#define HDR_BUFSIZE 512
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char buf[HDR_BUFSIZE], *fname;
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struct ecoff_exechdr *ecoffp;
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Elf_Ehdr *elfp;
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int fd;
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unsigned long loadaddr;
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if (argc != 3)
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errx(1, "must be given two arguments (load addr, file name)");
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if (sscanf(argv[1], "%lx", &loadaddr) != 1)
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errx(1, "load addr argument (%s) not valid", argv[1]);
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fname = argv[2];
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if ((fd = open(fname, O_RDONLY, 0)) == -1)
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err(1, "%s: open failed", 0);
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if (read(fd, &buf, HDR_BUFSIZE) < HDR_BUFSIZE)
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err(1, "%s: read failed", fname);
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ecoffp = (struct ecoff_exechdr *)buf;
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elfp = (Elf_Ehdr *)buf;
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if (!ECOFF_BADMAG(ecoffp)) {
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printf("%d\n", ECOFF_TXTOFF(ecoffp));
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} else if (memcmp(Elf_e_ident, elfp->e_ident, Elf_e_siz) == 0) {
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Elf_Phdr phdr;
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/* XXX assume the first segment is the one we want */
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if (lseek(fd, elfp->e_phoff, SEEK_SET) == -1)
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err(1, "%s: lseek phdr failed", fname);
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if (read(fd, (void *)&phdr, sizeof(phdr)) != sizeof(phdr))
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err(1, "%s: read phdr failed", fname);
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printf("%d\n", phdr.p_offset + (loadaddr - phdr.p_vaddr));
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} else
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errx(1, "%s: bad magic number", fname);
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close(fd);
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}
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