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Commit | Line | Data |
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b00dc837 | 1 | /* |
1da177e4 LT |
2 | Simple utility to make a single-image install kernel with initial ramdisk |
3 | for Sparc64 tftpbooting without need to set up nfs. | |
4 | ||
5 | Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <string.h> | |
23 | #include <ctype.h> | |
24 | #include <errno.h> | |
25 | #include <fcntl.h> | |
26 | #include <dirent.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | ||
32 | /* Note: run this on an a.out kernel (use elftoaout for it), as PROM looks for a.out image onlly | |
33 | usage: piggyback vmlinux System.map tail, where tail is gzipped fs of the initial ramdisk */ | |
34 | ||
35 | void die(char *str) | |
36 | { | |
37 | perror (str); | |
38 | exit(1); | |
39 | } | |
40 | ||
41 | int main(int argc,char **argv) | |
42 | { | |
43 | char buffer [1024], *q, *r; | |
44 | unsigned int i, j, k, start, end, offset; | |
45 | FILE *map; | |
46 | struct stat s; | |
47 | int image, tail; | |
48 | ||
49 | if (stat (argv[3], &s) < 0) die (argv[3]); | |
50 | map = fopen (argv[2], "r"); | |
51 | if (!map) die(argv[2]); | |
52 | while (fgets (buffer, 1024, map)) { | |
53 | if (!strcmp (buffer + 19, "_start\n")) | |
54 | start = strtoul (buffer + 8, NULL, 16); | |
55 | else if (!strcmp (buffer + 19, "_end\n")) | |
56 | end = strtoul (buffer + 8, NULL, 16); | |
57 | } | |
58 | fclose (map); | |
59 | if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]); | |
60 | if (read(image,buffer,512) != 512) die(argv[1]); | |
61 | if (!memcmp (buffer, "\177ELF", 4)) { | |
62 | unsigned int *p = (unsigned int *)(buffer + *(unsigned int *)(buffer + 28)); | |
63 | ||
64 | i = p[1] + *(unsigned int *)(buffer + 24) - p[2]; | |
65 | if (lseek(image,i,0) < 0) die("lseek"); | |
66 | if (read(image,buffer,512) != 512) die(argv[1]); | |
67 | j = 0; | |
68 | } else if (*(unsigned int *)buffer == 0x01030107) { | |
69 | i = j = 32; | |
70 | } else { | |
71 | fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n"); | |
72 | exit(1); | |
73 | } | |
74 | k = i; | |
75 | if (j == 32 && buffer[40] == 'H' && buffer[41] == 'd' && buffer[42] == 'r' && buffer[43] == 'S') { | |
76 | offset = 40 + 10; | |
77 | } else { | |
78 | i += ((*(unsigned short *)(buffer + j + 2))<<2) - 512; | |
79 | if (lseek(image,i,0) < 0) die("lseek"); | |
80 | if (read(image,buffer,1024) != 1024) die(argv[1]); | |
81 | for (q = buffer, r = q + 512; q < r; q += 4) { | |
82 | if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S') | |
83 | break; | |
84 | } | |
85 | if (q == r) { | |
86 | fprintf (stderr, "Couldn't find headers signature in the kernel.\n"); | |
87 | exit(1); | |
88 | } | |
89 | offset = i + (q - buffer) + 10; | |
90 | } | |
91 | if (lseek(image, offset, 0) < 0) die ("lseek"); | |
92 | *(unsigned *)buffer = 0; | |
93 | *(unsigned *)(buffer + 4) = 0x01000000; | |
94 | *(unsigned *)(buffer + 8) = ((end + 32 + 8191) & ~8191); | |
95 | *(unsigned *)(buffer + 12) = s.st_size; | |
96 | if (write(image,buffer+2,14) != 14) die (argv[1]); | |
97 | if (lseek(image, 4, 0) < 0) die ("lseek"); | |
98 | *(unsigned *)buffer = ((end + 32 + 8191) & ~8191) - (start & ~0x3fffffUL) + s.st_size; | |
99 | *(unsigned *)(buffer + 4) = 0; | |
100 | *(unsigned *)(buffer + 8) = 0; | |
101 | if (write(image,buffer,12) != 12) die (argv[1]); | |
102 | if (lseek(image, k - start + ((end + 32 + 8191) & ~8191), 0) < 0) die ("lseek"); | |
103 | if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]); | |
104 | while ((i = read (tail,buffer,1024)) > 0) | |
105 | if (write(image,buffer,i) != i) die (argv[1]); | |
106 | if (close(image) < 0) die("close"); | |
107 | if (close(tail) < 0) die("close"); | |
108 | return 0; | |
109 | } |