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Diffstat (limited to 'arch/sparc/boot/piggyback.c')
| -rw-r--r-- | arch/sparc/boot/piggyback.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/sparc/boot/piggyback.c b/arch/sparc/boot/piggyback.c new file mode 100644 index 000000000000..6962cc68ed5b --- /dev/null +++ b/arch/sparc/boot/piggyback.c @@ -0,0 +1,137 @@ +/* $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; +} |