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/*
* addinitrd - program to add a initrd image to an ecoff kernel
*
* (C) 1999 Thomas Bogendoerfer
* minor modifications, cleanup: Guido Guenther <agx@sigxcpu.org>
* further cleanup: Maciej W. Rozycki
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.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, cnt;
int swab = 0;
if (argc != 4) {
printf("Usage: %s <vmlinux> <initrd> <outfile>\n", argv[0]);
exit(1);
}
if ((fd_vmlinux = open (argv[1], O_RDONLY)) < 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;
}
/* make sure we have an empty data segment for the initrd */
if (eaout.dsize || esecs[1].s_size) {
fprintf(stderr, "Data segment not empty. Giving up!\n");
exit(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");
/* skip padding */
if(lseek(fd_vmlinux, SWAB(esecs[0].s_scnptr), SEEK_SET) == (off_t)-1)
die("lseek vmlinux");
if(lseek(fd_outfile, SWAB(esecs[0].s_scnptr), SEEK_SET) == (off_t)-1)
die("lseek outfile");
/* copy text segment */
cnt = SWAB(eaout.tsize);
while (cnt) {
if ((i = read (fd_vmlinux, buf, sizeof buf)) <= 0)
die("read vmlinux");
if (write (fd_outfile, buf, i) != i)
die("write vmlinux");
cnt -= i;
}
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;
}
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