On Mon, Jun 22, 2009 at 02:22, Pete Zaitcev<zaitcev@xxxxxxxxxx> wrote:
> On Sun, 21 Jun 2009 18:31:04 +1000, Julian Calaby <julian.calaby@xxxxxxxxx> wrote:
>
>> I think that the bulk of the changes would fit under the umbrella of
>> "endian fixes", and would really like to get hold of the "endian fixes
>> for cross-compiles" patch from Pete Zaitcev <zaitcev@xxxxxxxxx> (CC'd)
>> which was applied to arch/sparc/boot/piggyback.c (as it was at the
>> time) some time in 2000. The problem is that none of the git trees I
>> can find go back any further back than 2002-02-05.
>
> Doesn't looks like it's going to help you any, but here's the patch,
> re-created by diffing two random trees I happened to have laying around.
No, this is perfect, it shows me exactly what I expected to see.
Thanks for your help!
> --- linux-2.4.0-test1/arch/sparc/boot/piggyback.c 2000-03-12 20:11:16.000000000 -0700
> +++ linux-2.4.21-53.EL/arch/sparc/boot/piggyback.c 2000-12-11 13:37:02.000000000 -0700
> @@ -1,9 +1,10 @@
> -/* $Id: piggyback.c,v 1.3 2000/03/11 00:22:26 zaitcev Exp $
> +/* $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@xxxxxxxxxxxxxxxxxxx)
> -
> + Pete Zaitcev <zaitcev@xxxxxxxxx> 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
> @@ -34,6 +35,24 @@
> * 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. */
> @@ -50,7 +69,8 @@ void die(char *str)
>
> int main(int argc,char **argv)
> {
> - char buffer [1024], *q, *r;
> + 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;
> @@ -74,21 +94,20 @@ int main(int argc,char **argv)
> }
> 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 (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 (*(unsigned int *)buffer == 0x01030107) {
> + } 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 += ((*(unsigned short *)(buffer + j + 2))<<2) - 512;
> + 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) {
> @@ -101,10 +120,12 @@ int main(int argc,char **argv)
> }
> 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 + 4095) & ~4095);
> - *(unsigned *)(buffer + 12) = s.st_size;
> +
> + 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]);
>
> -- Pete
>
--
Julian Calaby
Email: julian.calaby@xxxxxxxxx
.Plan: http://sites.google.com/site/juliancalaby/
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