131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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* addinitrd - program to add a initrd image to an ecoff kernel
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*
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* (C) 1999 Thomas Bogendoerfer
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* minor modifications, cleanup: Guido Guenther <agx@sigxcpu.org>
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* further cleanup: Maciej W. Rozycki
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <netinet/in.h>
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#include "ecoff.h"
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#define MIPS_PAGE_SIZE 4096
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#define MIPS_PAGE_MASK (MIPS_PAGE_SIZE-1)
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#define swab16(x) \
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((unsigned short)( \
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(((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
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(((unsigned short)(x) & (unsigned short)0xff00U) >> 8) ))
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#define swab32(x) \
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((unsigned int)( \
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(((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
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(((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \
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(((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \
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(((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) ))
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#define SWAB(a) (swab ? swab32(a) : (a))
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void die(char *s)
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{
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perror(s);
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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int fd_vmlinux, fd_initrd, fd_outfile;
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FILHDR efile;
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AOUTHDR eaout;
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SCNHDR esecs[3];
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struct stat st;
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char buf[1024];
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unsigned long loadaddr;
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unsigned long initrd_header[2];
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int i, cnt;
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int swab = 0;
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if (argc != 4) {
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printf("Usage: %s <vmlinux> <initrd> <outfile>\n", argv[0]);
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exit(1);
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}
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if ((fd_vmlinux = open (argv[1], O_RDONLY)) < 0)
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die("open vmlinux");
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if (read (fd_vmlinux, &efile, sizeof efile) != sizeof efile)
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die("read file header");
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if (read (fd_vmlinux, &eaout, sizeof eaout) != sizeof eaout)
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die("read aout header");
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if (read (fd_vmlinux, esecs, sizeof esecs) != sizeof esecs)
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die("read section headers");
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/*
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* check whether the file is good for us
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*/
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/* TBD */
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/*
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* check, if we have to swab words
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*/
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if (ntohs(0xaa55) == 0xaa55) {
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if (efile.f_magic == swab16(MIPSELMAGIC))
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swab = 1;
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} else {
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if (efile.f_magic == swab16(MIPSEBMAGIC))
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swab = 1;
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}
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/* make sure we have an empty data segment for the initrd */
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if (eaout.dsize || esecs[1].s_size) {
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fprintf(stderr, "Data segment not empty. Giving up!\n");
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exit(1);
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}
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if ((fd_initrd = open (argv[2], O_RDONLY)) < 0)
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die("open initrd");
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if (fstat (fd_initrd, &st) < 0)
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die("fstat initrd");
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loadaddr = ((SWAB(esecs[2].s_vaddr) + SWAB(esecs[2].s_size)
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+ MIPS_PAGE_SIZE-1) & ~MIPS_PAGE_MASK) - 8;
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if (loadaddr < (SWAB(esecs[2].s_vaddr) + SWAB(esecs[2].s_size)))
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loadaddr += MIPS_PAGE_SIZE;
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initrd_header[0] = SWAB(0x494E5244);
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initrd_header[1] = SWAB(st.st_size);
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eaout.dsize = esecs[1].s_size = initrd_header[1] = SWAB(st.st_size+8);
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eaout.data_start = esecs[1].s_vaddr = esecs[1].s_paddr = SWAB(loadaddr);
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if ((fd_outfile = open (argv[3], O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
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die("open outfile");
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if (write (fd_outfile, &efile, sizeof efile) != sizeof efile)
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die("write file header");
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if (write (fd_outfile, &eaout, sizeof eaout) != sizeof eaout)
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die("write aout header");
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if (write (fd_outfile, esecs, sizeof esecs) != sizeof esecs)
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die("write section headers");
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/* skip padding */
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if(lseek(fd_vmlinux, SWAB(esecs[0].s_scnptr), SEEK_SET) == (off_t)-1)
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die("lseek vmlinux");
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if(lseek(fd_outfile, SWAB(esecs[0].s_scnptr), SEEK_SET) == (off_t)-1)
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die("lseek outfile");
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/* copy text segment */
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cnt = SWAB(eaout.tsize);
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while (cnt) {
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if ((i = read (fd_vmlinux, buf, sizeof buf)) <= 0)
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die("read vmlinux");
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if (write (fd_outfile, buf, i) != i)
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die("write vmlinux");
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cnt -= i;
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}
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if (write (fd_outfile, initrd_header, sizeof initrd_header) != sizeof initrd_header)
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die("write initrd header");
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while ((i = read (fd_initrd, buf, sizeof buf)) > 0)
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if (write (fd_outfile, buf, i) != i)
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die("write initrd");
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close(fd_vmlinux);
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close(fd_initrd);
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return 0;
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}
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