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1 | /* |
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 | |
38 | static unsigned short ld2(char *p) |
39 | { |
40 | return (p[0] << 8) | p[1]; |
41 | } |
42 | |
43 | static unsigned int ld4(char *p) |
44 | { |
45 | return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; |
46 | } |
47 | |
48 | static void st4(char *p, unsigned int x) |
49 | { |
50 | p[0] = x >> 24; |
51 | p[1] = x >> 16; |
52 | p[2] = x >> 8; |
53 | p[3] = x; |
54 | } |
55 | |
56 | static void usage(void) |
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 | |
64 | static void die(char *str) |
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 }; |
73 | char buffer[1024], *q, *r; |
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); |
87 | else if (!strcmp (buffer + 8, " A _end\n") || !strcmp (buffer + 16, " A _end\n")) |
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 | } |
138 |
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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