Commit | Line | Data |
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66a45dd3 PM |
1 | /* |
2 | * hack-coff.c - hack the header of an xcoff file to fill in | |
3 | * a few fields needed by the Open Firmware xcoff loader on | |
4 | * Power Macs but not initialized by objcopy. | |
5 | * | |
6 | * Copyright (C) Paul Mackerras 1997. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <fcntl.h> | |
17 | #include <string.h> | |
18 | #include "rs6000.h" | |
19 | ||
20 | #define AOUT_MAGIC 0x010b | |
21 | ||
22 | #define get_16be(x) ((((unsigned char *)(x))[0] << 8) \ | |
23 | + ((unsigned char *)(x))[1]) | |
24 | #define put_16be(x, v) (((unsigned char *)(x))[0] = (v) >> 8, \ | |
25 | ((unsigned char *)(x))[1] = (v) & 0xff) | |
26 | #define get_32be(x) ((((unsigned char *)(x))[0] << 24) \ | |
27 | + (((unsigned char *)(x))[1] << 16) \ | |
28 | + (((unsigned char *)(x))[2] << 8) \ | |
29 | + ((unsigned char *)(x))[3]) | |
30 | ||
31 | int | |
32 | main(int ac, char **av) | |
33 | { | |
34 | int fd; | |
35 | int i, nsect; | |
36 | int aoutsz; | |
37 | struct external_filehdr fhdr; | |
38 | AOUTHDR aout; | |
39 | struct external_scnhdr shdr; | |
40 | ||
41 | if (ac != 2) { | |
42 | fprintf(stderr, "Usage: hack-coff coff-file\n"); | |
43 | exit(1); | |
44 | } | |
45 | if ((fd = open(av[1], 2)) == -1) { | |
46 | perror(av[2]); | |
47 | exit(1); | |
48 | } | |
49 | if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr)) | |
50 | goto readerr; | |
51 | i = get_16be(fhdr.f_magic); | |
52 | if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) { | |
53 | fprintf(stderr, "%s: not an xcoff file\n", av[1]); | |
54 | exit(1); | |
55 | } | |
56 | aoutsz = get_16be(fhdr.f_opthdr); | |
57 | if (read(fd, &aout, aoutsz) != aoutsz) | |
58 | goto readerr; | |
59 | nsect = get_16be(fhdr.f_nscns); | |
60 | for (i = 0; i < nsect; ++i) { | |
61 | if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr)) | |
62 | goto readerr; | |
63 | if (strcmp(shdr.s_name, ".text") == 0) { | |
64 | put_16be(aout.o_snentry, i+1); | |
65 | put_16be(aout.o_sntext, i+1); | |
66 | } else if (strcmp(shdr.s_name, ".data") == 0) { | |
67 | put_16be(aout.o_sndata, i+1); | |
68 | } else if (strcmp(shdr.s_name, ".bss") == 0) { | |
69 | put_16be(aout.o_snbss, i+1); | |
70 | } | |
71 | } | |
72 | put_16be(aout.magic, AOUT_MAGIC); | |
73 | if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1 | |
74 | || write(fd, &aout, aoutsz) != aoutsz) { | |
75 | fprintf(stderr, "%s: write error\n", av[1]); | |
76 | exit(1); | |
77 | } | |
78 | close(fd); | |
79 | exit(0); | |
80 | ||
81 | readerr: | |
82 | fprintf(stderr, "%s: read error or file too short\n", av[1]); | |
83 | exit(1); | |
84 | } |