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1 | /* |
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 | static 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 | start = end = 0; |
50 | if (stat (argv[3], &s) < 0) die (argv[3]); |
51 | map = fopen (argv[2], "r"); |
52 | if (!map) die(argv[2]); |
53 | while (fgets (buffer, 1024, map)) { |
54 | if (!strcmp (buffer + 19, "_start\n")) |
55 | start = strtoul (buffer + 8, NULL, 16); |
56 | else if (!strcmp (buffer + 19, "_end\n")) |
57 | end = strtoul (buffer + 8, NULL, 16); |
58 | } |
59 | fclose (map); |
60 | if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]); |
61 | if (read(image,buffer,512) != 512) die(argv[1]); |
62 | if (!memcmp (buffer, "\177ELF", 4)) { |
63 | unsigned int *p = (unsigned int *)(buffer + *(unsigned int *)(buffer + 28)); |
64 | |
65 | i = p[1] + *(unsigned int *)(buffer + 24) - p[2]; |
66 | if (lseek(image,i,0) < 0) die("lseek"); |
67 | if (read(image,buffer,512) != 512) die(argv[1]); |
68 | j = 0; |
69 | } else if (*(unsigned int *)buffer == 0x01030107) { |
70 | i = j = 32; |
71 | } else { |
72 | fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n"); |
73 | exit(1); |
74 | } |
75 | k = i; |
76 | if (j == 32 && buffer[40] == 'H' && buffer[41] == 'd' && buffer[42] == 'r' && buffer[43] == 'S') { |
77 | offset = 40 + 10; |
78 | } else { |
79 | i += ((*(unsigned short *)(buffer + j + 2))<<2) - 512; |
80 | if (lseek(image,i,0) < 0) die("lseek"); |
81 | if (read(image,buffer,1024) != 1024) die(argv[1]); |
82 | for (q = buffer, r = q + 512; q < r; q += 4) { |
83 | if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S') |
84 | break; |
85 | } |
86 | if (q == r) { |
87 | fprintf (stderr, "Couldn't find headers signature in the kernel.\n"); |
88 | exit(1); |
89 | } |
90 | offset = i + (q - buffer) + 10; |
91 | } |
92 | if (lseek(image, offset, 0) < 0) die ("lseek"); |
93 | *(unsigned *)buffer = 0; |
94 | *(unsigned *)(buffer + 4) = 0x01000000; |
95 | *(unsigned *)(buffer + 8) = ((end + 32 + 8191) & ~8191); |
96 | *(unsigned *)(buffer + 12) = s.st_size; |
97 | if (write(image,buffer+2,14) != 14) die (argv[1]); |
98 | if (lseek(image, 4, 0) < 0) die ("lseek"); |
99 | *(unsigned *)buffer = ((end + 32 + 8191) & ~8191) - (start & ~0x3fffffUL) + s.st_size; |
100 | *(unsigned *)(buffer + 4) = 0; |
101 | *(unsigned *)(buffer + 8) = 0; |
102 | if (write(image,buffer,12) != 12) die (argv[1]); |
103 | if (lseek(image, k - start + ((end + 32 + 8191) & ~8191), 0) < 0) die ("lseek"); |
104 | if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]); |
105 | while ((i = read (tail,buffer,1024)) > 0) |
106 | if (write(image,buffer,i) != i) die (argv[1]); |
107 | if (close(image) < 0) die("close"); |
108 | if (close(tail) < 0) die("close"); |
109 | return 0; |
110 | } |
111 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9