Commit 1075c4ef authored by Sam Ravnborg's avatar Sam Ravnborg Committed by David S. Miller
Browse files

sparc: fix tftpboot.img for sparc64 on little-endian host 



piggyback_32 adapted to support sparc64:
- locating "HdrS" differs for sparc and sparc64
- sparc64 updates a_text, a_data + a_bss in the final a.out header

Updated Makefile to use piggyback_32 for sparc64.
Deleted the now unused piggyback_64.c

piggyback_32.c is host endian neutral and works on both
little-endian and big-endian hosts.
This fixes a long standing bug where sparc64 could not
generate tftpboot.img on a x86 host.

Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a020bb17

arch/sparc/boot/Makefile

+3 −3
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ 
ROOT_IMG	:= /usr/src/root.img

ELFTOAOUT	:= elftoaout



hostprogs-y	:= piggyback_32 piggyback_64 btfixupprep

hostprogs-y	:= piggyback_32 btfixupprep

targets		:= tftpboot.img btfix.o btfix.S image zImage vmlinux.aout

clean-files	:= System.map
@@ -69,7 +69,7 @@ endif 


ifeq ($(CONFIG_SPARC64),y)

quiet_cmd_piggy     = PIGGY   $@

      cmd_piggy     = $(obj)/piggyback_64 $@ System.map $(ROOT_IMG)

      cmd_piggy     = $(obj)/piggyback_32 $(BITS) $@ System.map $(ROOT_IMG)

quiet_cmd_strip     = STRIP   $@

      cmd_strip     = $(STRIP) -R .comment -R .note -K sun4u_init -K _end -K _start vmlinux -o $@
@@ -82,7 +82,7 @@ $(obj)/image: vmlinux FORCE 
$(obj)/zImage: $(obj)/image

	$(call if_changed,gzip)



$(obj)/tftpboot.img: $(obj)/image $(obj)/piggyback_64 System.map $(ROOT_IMG) FORCE

$(obj)/tftpboot.img: $(obj)/image $(obj)/piggyback_32 System.map $(ROOT_IMG) FORCE

	$(call if_changed,elftoaout)

	$(call if_changed,piggy)

	@echo '  kernel: $@ is ready'

arch/sparc/boot/piggyback_32.c

+77 −20
Original line number Diff line number Diff line
@@ -107,7 +107,8 @@ static int end_line(const char *line) 
 *

 * Return 0 if either start or end is not found

 */

static int get_start_end(const char *filename, unsigned int *start, unsigned int *end)

static int get_start_end(const char *filename, unsigned int *start,

                                               unsigned int *end)

{

	FILE *map;

	char buffer[1024];
@@ -131,11 +132,60 @@ static int get_start_end(const char *filename, unsigned int *start, unsigned int 
	return 1;

}



#define LOOKBACK (128 * 4)

#define BUFSIZE 1024

/*

 * Find the HdrS entry from head_32/head_64.

 * We check if it is at the beginning of the file (sparc64 case)

 * and if not we search for it.

 * When we search do so in steps of 4 as HdrS is on a 4-byte aligned

 * address (it is on same alignment as sparc instructions)

 * Return the offset to the HdrS entry (as off_t)

 */

static off_t get_hdrs_offset(int kernelfd, const char *filename)

{

	char buffer[BUFSIZE];

	off_t offset;

	int i;



	if (lseek(kernelfd, 0, SEEK_SET) < 0)

		die("lseek");

	if (read(kernelfd, buffer, BUFSIZE) != BUFSIZE)

		die(filename);



	if (buffer[40] == 'H' && buffer[41] == 'd' &&

	    buffer[42] == 'r' && buffer[43] == 'S') {

		return 40;

	} else {

		/*  Find the gokernel label */

		/* Decode offset from branch instruction */

		offset = ld2(buffer + AOUT_TEXT_OFFSET + 2) << 2;

		/* Go back 512 bytes so we do not miss HdrS */

		offset -= LOOKBACK;

		/* skip a.out header */

		offset += AOUT_TEXT_OFFSET;

		if (lseek(kernelfd, offset, SEEK_SET) < 0)

			die("lseek");

		if (read(kernelfd, buffer, BUFSIZE) != BUFSIZE)

			die(filename);



		for (i = 0; i < LOOKBACK; i += 4) {

			if (buffer[i + 0] == 'H' && buffer[i + 1] == 'd' &&

			    buffer[i + 2] == 'r' && buffer[i + 3] == 'S') {

				return offset + i;

			}

		}

	}

	fprintf (stderr, "Couldn't find headers signature in %s\n", filename);

	exit(1);

}



int main(int argc,char **argv)

{

	static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 };

	char buffer[1024], *q, *r;

	unsigned int i, start, end, offset;

	char buffer[1024];

	unsigned int i, start, end;

	off_t offset;

	struct stat s;

	int image, tail;
@@ -147,7 +197,8 @@ int main(int argc,char **argv) 
		die(argv[4]);



	if (!get_start_end(argv[3], &start, &end)) {

		fprintf (stderr, "Could not determine start and end from %s\n", argv[3]);

		fprintf(stderr, "Could not determine start and end from %s\n",

		        argv[3]);

		exit(1);

	}

	if ((image = open(argv[2], O_RDWR)) < 0)
@@ -159,27 +210,17 @@ int main(int argc,char **argv) 
		exit(1);

	}

	/*

	 * We need to fill in values for sparc_ramdisk_image + sparc_ramdisk_size

	 * We need to fill in values for

	 * sparc_ramdisk_image + sparc_ramdisk_size

	 * To locate these symbols search for the "HdrS" text which appear

	 * in the image a little before the gokernel symbol.

	 * See definition of these in init_32.S

	 */



	/*  Find the gokernel label */

	i = AOUT_TEXT_OFFSET + (ld2(buffer + AOUT_TEXT_OFFSET + 2) << 2) - 512;

	if (lseek(image, i, 0) < 0)

		die("lseek");

	if (read(image, buffer, 1024) != 1024)

		die(argv[2]);

	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;

	offset = get_hdrs_offset(image, argv[2]);

	/* skip HdrS + LINUX_VERSION_CODE + HdrS version */

	offset += 10;



	if (lseek(image, offset, 0) < 0)

		die("lseek");
@@ -198,6 +239,22 @@ int main(int argc,char **argv) 
	if (write(image, buffer + 2, 14) != 14)

		die(argv[2]);



	/* For sparc64 update a_text and clear a_data + a_bss */

	if (is64bit)

	{

		if (lseek(image, 4, 0) < 0)

			die("lseek");

		/* a_text */

		st4(buffer, align(end + 32 + 8191) - (start & ~0x3fffffUL) +

		            s.st_size);

		/* a_data */

		st4(buffer + 4, 0);

		/* a_bss */

		st4(buffer + 8, 0);

		if (write(image, buffer, 12) != 12)

			die(argv[2]);

	}



	/* seek page aligned boundary in the image file and add boot image */

	if (lseek(image, AOUT_TEXT_OFFSET - start + align(end + 32), 0) < 0)

		die("lseek");

arch/sparc/boot/piggyback_64.c

deleted100644 → 0
+0 −110
Original line number Diff line number Diff line 
/*

   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 */



static 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;

	

	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 + 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;

}

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