/* $NetBSD: coffhdrfix.c,v 1.2 2008/04/28 20:23:18 martin Exp $ */ /*- * Copyright (c) 2004 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by UCHIYAMA Yasushi. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* fixup GNU binutils file offset error. */ #include <stdio.h> #include <sys/types.h> #include <sys/fcntl.h> #include <sys/mman.h> typedef uint8_t Coff_Byte; typedef uint8_t Coff_Half[2]; typedef uint8_t Coff_Word[4]; #define ECOFF_OMAGIC 0407 #define ECOFF_MAGIC_MIPSEB 0x0160 struct coff_filehdr { Coff_Half f_magic; Coff_Half f_nscns; Coff_Word f_timdat; Coff_Word f_symptr; Coff_Word f_nsyms; Coff_Half f_opthdr; Coff_Half f_flags; }; struct coff_aouthdr { Coff_Half a_magic; Coff_Half a_vstamp; Coff_Word a_tsize; Coff_Word a_dsize; Coff_Word a_bsize; Coff_Word a_entry; Coff_Word a_tstart; Coff_Word a_dstart; }; #define COFF_GET_HALF(w) ((w)[1] | ((w)[0] << 8)) #define COFF_SET_HALF(w,v) ((w)[1] = (uint8_t)(v), \ (w)[0] = (uint8_t)((v) >> 8)) #define COFF_GET_WORD(w) ((w)[3] | ((w)[2] << 8) | \ ((w)[1] << 16) | ((w)[0] << 24)) #define COFF_SET_WORD(w,v) ((w)[3] = (uint8_t)(v), \ (w)[2] = (uint8_t)((v) >> 8), \ (w)[1] = (uint8_t)((v) >> 16), \ (w)[0] = (uint8_t)((v) >> 24)) #define FILHSZ sizeof(struct coff_filehdr) #define SCNHSZ 40 int main(int argc, char *argp[]) { int fd, fdout, fileoff, i; struct coff_filehdr file; struct coff_aouthdr aout; char fname[256]; char buf[1024]; if (argc < 3) return 0; if ((fd = open(argp[1], O_RDWR)) < 0) { perror(0); return 0; } read(fd, &file, sizeof file); read(fd, &aout, sizeof aout); if (COFF_GET_HALF(file.f_magic) != ECOFF_MAGIC_MIPSEB) { fprintf (stderr, "not COFF file.\n"); return 0; } if (COFF_GET_HALF(aout.a_magic) != ECOFF_OMAGIC) { fprintf (stderr, "not OMAGIC.\n"); return 0; } fprintf(stderr, "File: magic: 0x%04x flags: 0x%04x\n", COFF_GET_HALF(file.f_magic), COFF_GET_HALF(file.f_flags)); fprintf(stderr, "Aout: magic: 0x%04x vstamp: %d\n", COFF_GET_HALF(aout.a_magic), COFF_GET_HALF(aout.a_vstamp)); fileoff = (FILHSZ + COFF_GET_HALF(file.f_opthdr) + COFF_GET_HALF(file.f_nscns) * SCNHSZ + 7) & ~7; fprintf(stderr, "File offset: 0x%x\n", fileoff); close(fd); if ((fdout = open(argp[2], O_CREAT | O_TRUNC | O_RDWR, 0644)) < 0) { perror (0); return 0; } fd = open(argp[1], O_RDWR); read(fd, buf, fileoff); write(fdout, buf, fileoff); lseek(fd, 8, SEEK_CUR); while ((i = read(fd, buf, 1024)) > 0) write(fdout, buf, i); close(fd); close(fdout); return 0; }