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 35static void 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 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