PageRenderTime 32ms CodeModel.GetById 14ms app.highlight 14ms RepoModel.GetById 1ms app.codeStats 0ms

/arch/sparc64/boot/piggyback.c

https://bitbucket.org/evzijst/gittest
C | 109 lines | 82 code | 6 blank | 21 comment | 55 complexity | 2d39782b0f916fb0f01b97cd17ecaea1 MD5 | raw file
  1/* $Id: piggyback.c,v 1.2 2000/09/19 14:34:39 anton Exp $
  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
 35void die(char *str)
 36{
 37	perror (str);
 38	exit(1);
 39}
 40
 41int 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}