You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
4.0 KiB
137 lines
4.0 KiB
/* $Id: piggyback.c,v 1.4 2000/12/05 00:48:57 anton Exp $
|
|
Simple utility to make a single-image install kernel with initial ramdisk
|
|
for Sparc tftpbooting without need to set up nfs.
|
|
|
|
Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
Pete Zaitcev <zaitcev@yahoo.com> endian fixes for cross-compiles, 2000.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <dirent.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
/*
|
|
* Note: run this on an a.out kernel (use elftoaout for it),
|
|
* as PROM looks for a.out image only.
|
|
*/
|
|
|
|
unsigned short ld2(char *p)
|
|
{
|
|
return (p[0] << 8) | p[1];
|
|
}
|
|
|
|
unsigned int ld4(char *p)
|
|
{
|
|
return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
|
|
}
|
|
|
|
void st4(char *p, unsigned int x)
|
|
{
|
|
p[0] = x >> 24;
|
|
p[1] = x >> 16;
|
|
p[2] = x >> 8;
|
|
p[3] = x;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
/* fs_img.gz is an image of initial ramdisk. */
|
|
fprintf(stderr, "Usage: piggyback vmlinux.aout System.map fs_img.gz\n");
|
|
fprintf(stderr, "\tKernel image will be modified in place.\n");
|
|
exit(1);
|
|
}
|
|
|
|
void die(char *str)
|
|
{
|
|
perror (str);
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc,char **argv)
|
|
{
|
|
static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 };
|
|
unsigned char buffer[1024], *q, *r;
|
|
unsigned int i, j, k, start, end, offset;
|
|
FILE *map;
|
|
struct stat s;
|
|
int image, tail;
|
|
|
|
if (argc != 4) usage();
|
|
start = end = 0;
|
|
if (stat (argv[3], &s) < 0) die (argv[3]);
|
|
map = fopen (argv[2], "r");
|
|
if (!map) die(argv[2]);
|
|
while (fgets (buffer, 1024, map)) {
|
|
if (!strcmp (buffer + 8, " T start\n") || !strcmp (buffer + 16, " T start\n"))
|
|
start = strtoul (buffer, NULL, 16);
|
|
else if (!strcmp (buffer + 8, " A end\n") || !strcmp (buffer + 16, " A end\n"))
|
|
end = strtoul (buffer, NULL, 16);
|
|
}
|
|
fclose (map);
|
|
if (!start || !end) {
|
|
fprintf (stderr, "Could not determine start and end from System.map\n");
|
|
exit(1);
|
|
}
|
|
if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]);
|
|
if (read(image,buffer,512) != 512) die(argv[1]);
|
|
if (memcmp (buffer, "\177ELF", 4) == 0) {
|
|
q = buffer + ld4(buffer + 28);
|
|
i = ld4(q + 4) + ld4(buffer + 24) - ld4(q + 8);
|
|
if (lseek(image,i,0) < 0) die("lseek");
|
|
if (read(image,buffer,512) != 512) die(argv[1]);
|
|
j = 0;
|
|
} else if (memcmp(buffer, aout_magic, 4) == 0) {
|
|
i = j = 32;
|
|
} else {
|
|
fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n");
|
|
exit(1);
|
|
}
|
|
k = i;
|
|
i += (ld2(buffer + j + 2)<<2) - 512;
|
|
if (lseek(image,i,0) < 0) die("lseek");
|
|
if (read(image,buffer,1024) != 1024) die(argv[1]);
|
|
for (q = buffer, r = q + 512; q < r; q += 4) {
|
|
if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S')
|
|
break;
|
|
}
|
|
if (q == r) {
|
|
fprintf (stderr, "Couldn't find headers signature in the kernel.\n");
|
|
exit(1);
|
|
}
|
|
offset = i + (q - buffer) + 10;
|
|
if (lseek(image, offset, 0) < 0) die ("lseek");
|
|
|
|
st4(buffer, 0);
|
|
st4(buffer + 4, 0x01000000);
|
|
st4(buffer + 8, (end + 32 + 4095) & ~4095);
|
|
st4(buffer + 12, s.st_size);
|
|
|
|
if (write(image,buffer+2,14) != 14) die (argv[1]);
|
|
if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0) die ("lseek");
|
|
if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]);
|
|
while ((i = read (tail,buffer,1024)) > 0)
|
|
if (write(image,buffer,i) != i) die (argv[1]);
|
|
if (close(image) < 0) die("close");
|
|
if (close(tail) < 0) die("close");
|
|
return 0;
|
|
}
|
|
|