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Commit | Line | Data |
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88278ca2 | 1 | /* |
1da177e4 LT |
2 | Simple utility to make a single-image install kernel with initial ramdisk |
3 | for Sparc tftpbooting without need to set up nfs. | |
4 | ||
5 | Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | Pete Zaitcev <zaitcev@yahoo.com> endian fixes for cross-compiles, 2000. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <ctype.h> | |
25 | #include <errno.h> | |
26 | #include <fcntl.h> | |
27 | #include <dirent.h> | |
28 | #include <unistd.h> | |
29 | #include <stdlib.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | ||
33 | /* | |
34 | * Note: run this on an a.out kernel (use elftoaout for it), | |
35 | * as PROM looks for a.out image only. | |
36 | */ | |
37 | ||
c843e315 | 38 | static unsigned short ld2(char *p) |
1da177e4 LT |
39 | { |
40 | return (p[0] << 8) | p[1]; | |
41 | } | |
42 | ||
c843e315 | 43 | static unsigned int ld4(char *p) |
1da177e4 LT |
44 | { |
45 | return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; | |
46 | } | |
47 | ||
c843e315 | 48 | static void st4(char *p, unsigned int x) |
1da177e4 LT |
49 | { |
50 | p[0] = x >> 24; | |
51 | p[1] = x >> 16; | |
52 | p[2] = x >> 8; | |
53 | p[3] = x; | |
54 | } | |
55 | ||
c843e315 | 56 | static void usage(void) |
1da177e4 LT |
57 | { |
58 | /* fs_img.gz is an image of initial ramdisk. */ | |
59 | fprintf(stderr, "Usage: piggyback vmlinux.aout System.map fs_img.gz\n"); | |
60 | fprintf(stderr, "\tKernel image will be modified in place.\n"); | |
61 | exit(1); | |
62 | } | |
63 | ||
c843e315 | 64 | static void die(char *str) |
1da177e4 LT |
65 | { |
66 | perror (str); | |
67 | exit(1); | |
68 | } | |
69 | ||
70 | int main(int argc,char **argv) | |
71 | { | |
72 | static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 }; | |
22b096a8 | 73 | char buffer[1024], *q, *r; |
1da177e4 LT |
74 | unsigned int i, j, k, start, end, offset; |
75 | FILE *map; | |
76 | struct stat s; | |
77 | int image, tail; | |
78 | ||
79 | if (argc != 4) usage(); | |
80 | start = end = 0; | |
81 | if (stat (argv[3], &s) < 0) die (argv[3]); | |
82 | map = fopen (argv[2], "r"); | |
83 | if (!map) die(argv[2]); | |
84 | while (fgets (buffer, 1024, map)) { | |
85 | if (!strcmp (buffer + 8, " T start\n") || !strcmp (buffer + 16, " T start\n")) | |
86 | start = strtoul (buffer, NULL, 16); | |
52da82cf | 87 | else if (!strcmp (buffer + 8, " A _end\n") || !strcmp (buffer + 16, " A _end\n")) |
1da177e4 LT |
88 | end = strtoul (buffer, NULL, 16); |
89 | } | |
90 | fclose (map); | |
91 | if (!start || !end) { | |
92 | fprintf (stderr, "Could not determine start and end from System.map\n"); | |
93 | exit(1); | |
94 | } | |
95 | if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]); | |
96 | if (read(image,buffer,512) != 512) die(argv[1]); | |
97 | if (memcmp (buffer, "\177ELF", 4) == 0) { | |
98 | q = buffer + ld4(buffer + 28); | |
99 | i = ld4(q + 4) + ld4(buffer + 24) - ld4(q + 8); | |
100 | if (lseek(image,i,0) < 0) die("lseek"); | |
101 | if (read(image,buffer,512) != 512) die(argv[1]); | |
102 | j = 0; | |
103 | } else if (memcmp(buffer, aout_magic, 4) == 0) { | |
104 | i = j = 32; | |
105 | } else { | |
106 | fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n"); | |
107 | exit(1); | |
108 | } | |
109 | k = i; | |
110 | i += (ld2(buffer + j + 2)<<2) - 512; | |
111 | if (lseek(image,i,0) < 0) die("lseek"); | |
112 | if (read(image,buffer,1024) != 1024) die(argv[1]); | |
113 | for (q = buffer, r = q + 512; q < r; q += 4) { | |
114 | if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S') | |
115 | break; | |
116 | } | |
117 | if (q == r) { | |
118 | fprintf (stderr, "Couldn't find headers signature in the kernel.\n"); | |
119 | exit(1); | |
120 | } | |
121 | offset = i + (q - buffer) + 10; | |
122 | if (lseek(image, offset, 0) < 0) die ("lseek"); | |
123 | ||
124 | st4(buffer, 0); | |
125 | st4(buffer + 4, 0x01000000); | |
126 | st4(buffer + 8, (end + 32 + 4095) & ~4095); | |
127 | st4(buffer + 12, s.st_size); | |
128 | ||
129 | if (write(image,buffer+2,14) != 14) die (argv[1]); | |
130 | if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0) die ("lseek"); | |
131 | if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]); | |
132 | while ((i = read (tail,buffer,1024)) > 0) | |
133 | if (write(image,buffer,i) != i) die (argv[1]); | |
134 | if (close(image) < 0) die("close"); | |
135 | if (close(tail) < 0) die("close"); | |
136 | return 0; | |
137 | } |