Viewing file:  addinitrd.c (3.14 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* addinitrd - program to add a initrd image to an ecoff kernel
*
* (C) 1999 Thomas Bogendoerfer
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "ecoff.h"
#define MIPS_PAGE_SIZE 4096
#define MIPS_PAGE_MASK (MIPS_PAGE_SIZE-1)
#define swab16(x) \
((unsigned short)( \
(((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
(((unsigned short)(x) & (unsigned short)0xff00U) >> 8) ))
#define swab32(x) \
((unsigned int)( \
(((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
(((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \
(((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \
(((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) ))
#define SWAB(a) (swab ? swab32(a) : (a))
void die (char *s)
{
perror (s);
exit (1);
}
int main (int argc, char *argv[])
{
int fd_vmlinux,fd_initrd,fd_outfile;
FILHDR efile;
AOUTHDR eaout;
SCNHDR esecs[3];
struct stat st;
char buf[1024];
unsigned long loadaddr;
unsigned long initrd_header[2];
int i;
int swab = 0;
if (argc != 4) {
printf ("Usage: %s <vmlinux> <initrd> <outfile>\n",argv[0]);
exit (1);
}
if ((fd_vmlinux = open (argv[1],O_RDWR)) < 0)
die ("open vmlinux");
if (read (fd_vmlinux, &efile, sizeof efile) != sizeof efile)
die ("read file header");
if (read (fd_vmlinux, &eaout, sizeof eaout) != sizeof eaout)
die ("read aout header");
if (read (fd_vmlinux, esecs, sizeof esecs) != sizeof esecs)
die ("read section headers");
/*
* check whether the file is good for us
*/
/* TBD */
/*
* check, if we have to swab words
*/
if (ntohs(0xaa55) == 0xaa55) {
if (efile.f_magic == swab16(MIPSELMAGIC))
swab = 1;
} else {
if (efile.f_magic == swab16(MIPSEBMAGIC))
swab = 1;
}
if ((fd_initrd = open (argv[2], O_RDONLY)) < 0)
die ("open initrd");
if (fstat (fd_initrd, &st) < 0)
die ("fstat initrd");
loadaddr = ((SWAB(esecs[2].s_vaddr) + SWAB(esecs[2].s_size)
+ MIPS_PAGE_SIZE-1) & ~MIPS_PAGE_MASK) - 8;
if (loadaddr < (SWAB(esecs[2].s_vaddr) + SWAB(esecs[2].s_size)))
loadaddr += MIPS_PAGE_SIZE;
initrd_header[0] = SWAB(0x494E5244);
initrd_header[1] = SWAB(st.st_size);
eaout.dsize = esecs[1].s_size = initrd_header[1] = SWAB(st.st_size+8);
eaout.data_start = esecs[1].s_vaddr = esecs[1].s_paddr = SWAB(loadaddr);
if ((fd_outfile = open (argv[3], O_RDWR|O_CREAT|O_TRUNC,0666)) < 0)
die ("open outfile");
if (write (fd_outfile, &efile, sizeof efile) != sizeof efile)
die ("write file header");
if (write (fd_outfile, &eaout, sizeof eaout) != sizeof eaout)
die ("write aout header");
if (write (fd_outfile, esecs, sizeof esecs) != sizeof esecs)
die ("write section headers");
while ((i = read (fd_vmlinux, buf, sizeof buf)) > 0)
if (write (fd_outfile, buf, i) != i)
die ("write vmlinux");
if (write (fd_outfile, initrd_header, sizeof initrd_header) != sizeof initrd_header)
die ("write initrd header");
while ((i = read (fd_initrd, buf, sizeof buf)) > 0)
if (write (fd_outfile, buf, i) != i)
die ("write initrd");
close (fd_vmlinux);
close (fd_initrd);
return 0;
}
|