| 1 | |
| 2 | |
| 3 | * hack-coff.c - hack the header of an xcoff file to fill in
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| 4 | * a few fields needed by the Open Firmware xcoff loader on
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| 5 | * Power Macs but not initialized by objcopy.
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| 6 | *
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| 7 | * Copyright (C) Paul Mackerras 1997.
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| 8 |
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| 9 | #include <stdio.h>
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| 10 | #include <stdlib.h>
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| 11 | #include <unistd.h>
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| 12 | #include <fcntl.h>
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| 13 | #include <string.h>
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| 14 | #include "rs6000.h"
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| 15 |
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| 16 | #define AOUT_MAGIC 0x010b
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| 17 |
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| 18 | #define get_16be(x) ((((unsigned char *)(x))[0] << 8) \
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| 19 | + ((unsigned char *)(x))[1])
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| 20 | #define put_16be(x, v) (((unsigned char *)(x))[0] = (v) >> 8, \
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| 21 | ((unsigned char *)(x))[1] = (v) & 0xff)
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| 22 | #define get_32be(x) ((((unsigned char *)(x))[0] << 24) \
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| 23 | + (((unsigned char *)(x))[1] << 16) \
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| 24 | + (((unsigned char *)(x))[2] << 8) \
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| 25 | + ((unsigned char *)(x))[3])
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| 26 |
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| 27 | int
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| 28 | main(int ac, char **av)
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| 29 | {
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| 30 | int fd;
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| 31 | int i, nsect;
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| 32 | int aoutsz;
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| 33 | struct external_filehdr fhdr;
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| 34 | struct aouthdr aout;
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| 35 | struct external_scnhdr shdr;
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| 36 |
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| 37 | if (ac != 2) {
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| 38 | fprintf(stderr, "Usage: hack-coff coff-file\n");
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| 39 | exit(1);
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| 40 | }
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| 41 | if ((fd = open(av[1], 2)) == -1) {
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| 42 | perror(av[2]);
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| 43 | exit(1);
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| 44 | }
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| 45 | if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))
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| 46 | goto readerr;
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| 47 | i = get_16be(fhdr.f_magic);
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| 48 | if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {
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| 49 | fprintf(stderr, "%s: not an xcoff file\n", av[1]);
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| 50 | exit(1);
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| 51 | }
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| 52 | aoutsz = get_16be(fhdr.f_opthdr);
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| 53 | if (read(fd, &aout, aoutsz) != aoutsz)
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| 54 | goto readerr;
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| 55 | nsect = get_16be(fhdr.f_nscns);
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| 56 | for (i = 0; i < nsect; ++i) {
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| 57 | if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
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| 58 | goto readerr;
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| 59 | if (strcmp(shdr.s_name, ".text") == 0) {
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| 60 | put_16be(aout.o_snentry, i+1);
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| 61 | put_16be(aout.o_sntext, i+1);
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| 62 | } else if (strcmp(shdr.s_name, ".data") == 0) {
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| 63 | put_16be(aout.o_sndata, i+1);
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| 64 | } else if (strcmp(shdr.s_name, ".bss") == 0) {
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| 65 | put_16be(aout.o_snbss, i+1);
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| 66 | }
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| 67 | }
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| 68 | put_16be(aout.magic, AOUT_MAGIC);
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| 69 | if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1
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| 70 | || write(fd, &aout, aoutsz) != aoutsz) {
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| 71 | fprintf(stderr, "%s: write error\n", av[1]);
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| 72 | exit(1);
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| 73 | }
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| 74 | close(fd);
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| 75 | exit(0);
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| 76 |
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| 77 | readerr:
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| 78 | fprintf(stderr, "%s: read error or file too short\n", av[1]);
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| 79 | exit(1);
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| 80 | }
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