0032c85745
Newer versions of binutils mark '_end' as 'B' instead of 'A' for whatever reason. To be honest, the piggyback code doesn't actually care what kind of symbol _start and _end are, it just wants to find them and record the address. So remove the type from the match strings. Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
272 lines
6.6 KiB
C
272 lines
6.6 KiB
C
/*
|
|
Simple utility to make a single-image install kernel with initial ramdisk
|
|
for Sparc tftpbooting without need to set up nfs.
|
|
|
|
Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
Pete Zaitcev <zaitcev@yahoo.com> endian fixes for cross-compiles, 2000.
|
|
Copyright (C) 2011 Sam Ravnborg <sam@ravnborg.org>
|
|
|
|
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 <dirent.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.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.
|
|
*/
|
|
|
|
#define AOUT_TEXT_OFFSET 32
|
|
|
|
static int is64bit = 0;
|
|
|
|
/* align to power-of-two size */
|
|
static int align(int n)
|
|
{
|
|
if (is64bit)
|
|
return (n + 0x1fff) & ~0x1fff;
|
|
else
|
|
return (n + 0xfff) & ~0xfff;
|
|
}
|
|
|
|
/* read two bytes as big endian */
|
|
static unsigned short ld2(char *p)
|
|
{
|
|
return (p[0] << 8) | p[1];
|
|
}
|
|
|
|
/* save 4 bytes as big endian */
|
|
static void st4(char *p, unsigned int x)
|
|
{
|
|
p[0] = x >> 24;
|
|
p[1] = x >> 16;
|
|
p[2] = x >> 8;
|
|
p[3] = x;
|
|
}
|
|
|
|
static void die(const char *str)
|
|
{
|
|
perror(str);
|
|
exit(1);
|
|
}
|
|
|
|
static void usage(void)
|
|
{
|
|
/* fs_img.gz is an image of initial ramdisk. */
|
|
fprintf(stderr, "Usage: piggyback bits vmlinux.aout System.map fs_img.gz\n");
|
|
fprintf(stderr, "\tKernel image will be modified in place.\n");
|
|
exit(1);
|
|
}
|
|
|
|
static int start_line(const char *line)
|
|
{
|
|
if (strcmp(line + 10, " _start\n") == 0)
|
|
return 1;
|
|
else if (strcmp(line + 18, " _start\n") == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int end_line(const char *line)
|
|
{
|
|
if (strcmp(line + 10, " _end\n") == 0)
|
|
return 1;
|
|
else if (strcmp (line + 18, " _end\n") == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find address for start and end in System.map.
|
|
* The file looks like this:
|
|
* f0004000 ... _start
|
|
* f0379f79 ... _end
|
|
* 1234567890123456
|
|
* ^coloumn 1
|
|
* There is support for 64 bit addresses too.
|
|
*
|
|
* Return 0 if either start or end is not found
|
|
*/
|
|
static int get_start_end(const char *filename, unsigned int *start,
|
|
unsigned int *end)
|
|
{
|
|
FILE *map;
|
|
char buffer[1024];
|
|
|
|
*start = 0;
|
|
*end = 0;
|
|
map = fopen(filename, "r");
|
|
if (!map)
|
|
die(filename);
|
|
while (fgets(buffer, 1024, map)) {
|
|
if (start_line(buffer))
|
|
*start = strtoul(buffer, NULL, 16);
|
|
else if (end_line(buffer))
|
|
*end = strtoul(buffer, NULL, 16);
|
|
}
|
|
fclose (map);
|
|
|
|
if (*start == 0 || *end == 0)
|
|
return 0;
|
|
|
|
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];
|
|
unsigned int i, start, end;
|
|
off_t offset;
|
|
struct stat s;
|
|
int image, tail;
|
|
|
|
if (argc != 5)
|
|
usage();
|
|
if (strcmp(argv[1], "64") == 0)
|
|
is64bit = 1;
|
|
if (stat (argv[4], &s) < 0)
|
|
die(argv[4]);
|
|
|
|
if (!get_start_end(argv[3], &start, &end)) {
|
|
fprintf(stderr, "Could not determine start and end from %s\n",
|
|
argv[3]);
|
|
exit(1);
|
|
}
|
|
if ((image = open(argv[2], O_RDWR)) < 0)
|
|
die(argv[2]);
|
|
if (read(image, buffer, 512) != 512)
|
|
die(argv[2]);
|
|
if (memcmp(buffer, aout_magic, 4) != 0) {
|
|
fprintf (stderr, "Not a.out. Don't blame me.\n");
|
|
exit(1);
|
|
}
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
offset = get_hdrs_offset(image, argv[2]);
|
|
/* skip HdrS + LINUX_VERSION_CODE + HdrS version */
|
|
offset += 10;
|
|
|
|
if (lseek(image, offset, 0) < 0)
|
|
die("lseek");
|
|
|
|
/*
|
|
* root_flags = 0
|
|
* root_dev = 1 (RAMDISK_MAJOR)
|
|
* ram_flags = 0
|
|
* sparc_ramdisk_image = "PAGE aligned address after _end")
|
|
* sparc_ramdisk_size = size of image
|
|
*/
|
|
st4(buffer, 0);
|
|
st4(buffer + 4, 0x01000000);
|
|
st4(buffer + 8, align(end + 32));
|
|
st4(buffer + 12, s.st_size);
|
|
|
|
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");
|
|
if ((tail = open(argv[4], O_RDONLY)) < 0)
|
|
die(argv[4]);
|
|
while ((i = read(tail, buffer, 1024)) > 0)
|
|
if (write(image, buffer, i) != i)
|
|
die(argv[2]);
|
|
if (close(image) < 0)
|
|
die("close");
|
|
if (close(tail) < 0)
|
|
die("close");
|
|
return 0;
|
|
}
|