1 /* $NetBSD: coffhdrfix.c,v 1.2 2008/04/28 20:23:18 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* fixup GNU binutils file offset error. */ 33 34 #include <stdio.h> 35 #include <sys/types.h> 36 #include <sys/fcntl.h> 37 #include <sys/mman.h> 38 39 typedef uint8_t Coff_Byte; 40 typedef uint8_t Coff_Half[2]; 41 typedef uint8_t Coff_Word[4]; 42 43 #define ECOFF_OMAGIC 0407 44 #define ECOFF_MAGIC_MIPSEB 0x0160 45 46 struct coff_filehdr { 47 Coff_Half f_magic; 48 Coff_Half f_nscns; 49 Coff_Word f_timdat; 50 Coff_Word f_symptr; 51 Coff_Word f_nsyms; 52 Coff_Half f_opthdr; 53 Coff_Half f_flags; 54 }; 55 56 struct coff_aouthdr { 57 Coff_Half a_magic; 58 Coff_Half a_vstamp; 59 Coff_Word a_tsize; 60 Coff_Word a_dsize; 61 Coff_Word a_bsize; 62 Coff_Word a_entry; 63 Coff_Word a_tstart; 64 Coff_Word a_dstart; 65 }; 66 67 #define COFF_GET_HALF(w) ((w)[1] | ((w)[0] << 8)) 68 #define COFF_SET_HALF(w,v) ((w)[1] = (uint8_t)(v), \ 69 (w)[0] = (uint8_t)((v) >> 8)) 70 #define COFF_GET_WORD(w) ((w)[3] | ((w)[2] << 8) | \ 71 ((w)[1] << 16) | ((w)[0] << 24)) 72 #define COFF_SET_WORD(w,v) ((w)[3] = (uint8_t)(v), \ 73 (w)[2] = (uint8_t)((v) >> 8), \ 74 (w)[1] = (uint8_t)((v) >> 16), \ 75 (w)[0] = (uint8_t)((v) >> 24)) 76 77 #define FILHSZ sizeof(struct coff_filehdr) 78 #define SCNHSZ 40 79 80 int 81 main(int argc, char *argp[]) 82 { 83 int fd, fdout, fileoff, i; 84 struct coff_filehdr file; 85 struct coff_aouthdr aout; 86 char fname[256]; 87 char buf[1024]; 88 89 if (argc < 3) 90 return 0; 91 92 if ((fd = open(argp[1], O_RDWR)) < 0) { 93 perror(0); 94 return 0; 95 } 96 read(fd, &file, sizeof file); 97 read(fd, &aout, sizeof aout); 98 99 if (COFF_GET_HALF(file.f_magic) != ECOFF_MAGIC_MIPSEB) { 100 fprintf (stderr, "not COFF file.\n"); 101 return 0; 102 } 103 if (COFF_GET_HALF(aout.a_magic) != ECOFF_OMAGIC) { 104 fprintf (stderr, "not OMAGIC.\n"); 105 return 0; 106 } 107 fprintf(stderr, "File: magic: 0x%04x flags: 0x%04x\n", 108 COFF_GET_HALF(file.f_magic), COFF_GET_HALF(file.f_flags)); 109 fprintf(stderr, "Aout: magic: 0x%04x vstamp: %d\n", 110 COFF_GET_HALF(aout.a_magic), COFF_GET_HALF(aout.a_vstamp)); 111 112 fileoff = (FILHSZ + 113 COFF_GET_HALF(file.f_opthdr) + 114 COFF_GET_HALF(file.f_nscns) * SCNHSZ + 7) & ~7; 115 fprintf(stderr, "File offset: 0x%x\n", fileoff); 116 close(fd); 117 118 if ((fdout = open(argp[2], O_CREAT | O_TRUNC | O_RDWR, 0644)) < 0) { 119 perror (0); 120 return 0; 121 } 122 fd = open(argp[1], O_RDWR); 123 read(fd, buf, fileoff); 124 write(fdout, buf, fileoff); 125 lseek(fd, 8, SEEK_CUR); 126 while ((i = read(fd, buf, 1024)) > 0) 127 write(fdout, buf, i); 128 close(fd); 129 close(fdout); 130 131 return 0; 132 } 133