diff options
Diffstat (limited to 'arch/sparc64/boot/piggyback.c')
| -rw-r--r-- | arch/sparc64/boot/piggyback.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/sparc64/boot/piggyback.c b/arch/sparc64/boot/piggyback.c new file mode 100644 index 000000000000..36f907408c60 --- /dev/null +++ b/arch/sparc64/boot/piggyback.c @@ -0,0 +1,109 @@ +/* $Id: piggyback.c,v 1.2 2000/09/19 14:34:39 anton Exp $ + Simple utility to make a single-image install kernel with initial ramdisk + for Sparc64 tftpbooting without need to set up nfs. + + Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + + 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 onlly + usage: piggyback vmlinux System.map tail, where tail is gzipped fs of the initial ramdisk */ + +void die(char *str) +{ + perror (str); + exit(1); +} + +int main(int argc,char **argv) +{ + char buffer [1024], *q, *r; + unsigned int i, j, k, start, end, offset; + FILE *map; + struct stat s; + int image, tail; + + 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 + 19, "_start\n")) + start = strtoul (buffer + 8, NULL, 16); + else if (!strcmp (buffer + 19, "_end\n")) + end = strtoul (buffer + 8, NULL, 16); + } + fclose (map); + 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)) { + unsigned int *p = (unsigned int *)(buffer + *(unsigned int *)(buffer + 28)); + + i = p[1] + *(unsigned int *)(buffer + 24) - p[2]; + if (lseek(image,i,0) < 0) die("lseek"); + if (read(image,buffer,512) != 512) die(argv[1]); + j = 0; + } else if (*(unsigned int *)buffer == 0x01030107) { + i = j = 32; + } else { + fprintf (stderr, "Not ELF nor a.out. Don't blame me.\n"); + exit(1); + } + k = i; + if (j == 32 && buffer[40] == 'H' && buffer[41] == 'd' && buffer[42] == 'r' && buffer[43] == 'S') { + offset = 40 + 10; + } else { + i += ((*(unsigned short *)(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"); + *(unsigned *)buffer = 0; + *(unsigned *)(buffer + 4) = 0x01000000; + *(unsigned *)(buffer + 8) = ((end + 32 + 8191) & ~8191); + *(unsigned *)(buffer + 12) = s.st_size; + if (write(image,buffer+2,14) != 14) die (argv[1]); + if (lseek(image, 4, 0) < 0) die ("lseek"); + *(unsigned *)buffer = ((end + 32 + 8191) & ~8191) - (start & ~0x3fffffUL) + s.st_size; + *(unsigned *)(buffer + 4) = 0; + *(unsigned *)(buffer + 8) = 0; + if (write(image,buffer,12) != 12) die (argv[1]); + if (lseek(image, k - start + ((end + 32 + 8191) & ~8191), 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; +} |