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coffhdrfix.c revision 1.1 
      1 /*	$NetBSD: coffhdrfix.c,v 1.1 2005/12/29 15:20:09 tsutsui 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /* fixup GNU binutils file offset error. */
     40 
     41 #include <stdio.h>
     42 #include <sys/types.h>
     43 #include <sys/fcntl.h>
     44 #include <sys/mman.h>
     45 
     46 typedef uint8_t Coff_Byte;
     47 typedef uint8_t Coff_Half[2];
     48 typedef uint8_t Coff_Word[4];
     49 
     50 #define	ECOFF_OMAGIC		0407
     51 #define	ECOFF_MAGIC_MIPSEB	0x0160
     52 
     53 struct coff_filehdr {
     54 	Coff_Half	f_magic;
     55 	Coff_Half	f_nscns;
     56 	Coff_Word	f_timdat;
     57 	Coff_Word	f_symptr;
     58 	Coff_Word	f_nsyms;
     59 	Coff_Half	f_opthdr;
     60 	Coff_Half	f_flags;
     61 };
     62 
     63 struct coff_aouthdr {
     64 	Coff_Half	a_magic;
     65 	Coff_Half	a_vstamp;
     66 	Coff_Word	a_tsize;
     67 	Coff_Word	a_dsize;
     68 	Coff_Word	a_bsize;
     69 	Coff_Word	a_entry;
     70 	Coff_Word	a_tstart;
     71 	Coff_Word	a_dstart;
     72 };
     73 
     74 #define	COFF_GET_HALF(w)	((w)[1] | ((w)[0] << 8))
     75 #define	COFF_SET_HALF(w,v)	((w)[1] = (uint8_t)(v),			\
     76 				(w)[0] = (uint8_t)((v) >> 8))
     77 #define	COFF_GET_WORD(w)	((w)[3] | ((w)[2] << 8) | 		\
     78 				((w)[1] << 16) | ((w)[0] << 24))
     79 #define	COFF_SET_WORD(w,v)	((w)[3] = (uint8_t)(v),			\
     80 				(w)[2] = (uint8_t)((v) >> 8),		\
     81 				(w)[1] = (uint8_t)((v) >> 16),		\
     82 				(w)[0] = (uint8_t)((v) >> 24))
     83 
     84 #define	FILHSZ	sizeof(struct coff_filehdr)
     85 #define	SCNHSZ	40
     86 
     87 int
     88 main(int argc, char *argp[])
     89 {
     90 	int fd, fdout, fileoff, i;
     91 	struct coff_filehdr file;
     92 	struct coff_aouthdr aout;
     93 	char fname[256];
     94 	char buf[1024];
     95 
     96 	if (argc < 3)
     97 		return 0;
     98 
     99 	if ((fd = open(argp[1], O_RDWR)) < 0) {
    100 		perror(0);
    101 		return 0;
    102 	}
    103 	read(fd, &file, sizeof file);
    104 	read(fd, &aout, sizeof aout);
    105 
    106 	if (COFF_GET_HALF(file.f_magic) != ECOFF_MAGIC_MIPSEB) {
    107 		fprintf (stderr, "not COFF file.\n");
    108 		return 0;
    109 	}
    110 	if (COFF_GET_HALF(aout.a_magic) != ECOFF_OMAGIC) {
    111 		fprintf (stderr, "not OMAGIC.\n");
    112 		return 0;
    113 	}
    114 	fprintf(stderr, "File: magic: 0x%04x flags: 0x%04x\n",
    115 	    COFF_GET_HALF(file.f_magic), COFF_GET_HALF(file.f_flags));
    116 	fprintf(stderr, "Aout: magic: 0x%04x vstamp: %d\n",
    117 	    COFF_GET_HALF(aout.a_magic), COFF_GET_HALF(aout.a_vstamp));
    118 
    119 	fileoff = (FILHSZ +
    120 	    COFF_GET_HALF(file.f_opthdr) +
    121 	    COFF_GET_HALF(file.f_nscns) * SCNHSZ + 7) & ~7;
    122 	fprintf(stderr, "File offset: 0x%x\n", fileoff);
    123 	close(fd);
    124 
    125 	if ((fdout = open(argp[2], O_CREAT | O_TRUNC | O_RDWR, 0644)) < 0) {
    126 		perror (0);
    127 		return 0;
    128 	}
    129 	fd = open(argp[1], O_RDWR);
    130 	read(fd, buf, fileoff);
    131 	write(fdout, buf, fileoff);
    132 	lseek(fd, 8, SEEK_CUR);
    133 	while ((i = read(fd, buf, 1024)) > 0)
    134 		write(fdout, buf, i);
    135 	close(fd);
    136 	close(fdout);
    137 
    138 	return 0;
    139 }
    140