At 2012-11-27 13:10:37,"Kumar amit mehta" <gmate.amit@xxxxxxxxx> wrote: >On Tue, Nov 27, 2012 at 12:44:45PM +0800, horse_rivers wrote: >> hi, >> when we compile kernel,gcc will put elf format information into the target file ,then we use build-tools construct the kernel Image, >> >> during this procedure,will elf information be copyed into Image file ? >> >Yes, it does but as you know that the kernel image will be in the compressed >format, therefore you'll have to decompress it first. I tried following with my >kernel image and then I was able to use the 'readelf' and 'objdump' on the >extracted elf: > and this file can boot inux os ? if I put this file into floppy ,and boot from floppy ,can I boot this kernel ? thanks! >amit@ubuntu:/tmp$ cp /boot/vmlinuz-3.7.0-rc3-next-20121029 /tmp/ >amit@ubuntu:/tmp$ od -A d -t x1 vmlinuz-3.7.0-rc3-next-20121029 | grep '1f 8b 08 >00' >0016992 f3 a5 fc 5e 8d 83 b4 91 4f 00 ff e0 1f 8b 08 00 > >amit@ubuntu:/tmp$ dd if=vmlinuz bs=1 skip=17004 | zcat > vmlinux > >How did i calculated 17004 ? >0016992 + offset of GZ signature(1f 8b 08 00), i.e. >0016992 + 12 > >amit@ubuntu:/tmp$ dd if=vmlinuz-3.7.0-rc3-next-20121029 bs=1 skip=17004 | >zcat > vmlinux >5233764+0 records in >5233764+0 records out >5233764 bytes (5.2 MB) copied > >amit@ubuntu:/tmp$ file vmlinux >vmlinux: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically >linked, BuildID[sha1]=0xb874d61ffd40167270bdc1a95274976200223cc0, stripped > >amit@ubuntu:/tmp$ objdump -f vmlinux > >vmlinux: file format elf32-i386 >architecture: i386, flags 0x00000102: >EXEC_P, D_PAGED >start address 0x01000000 > >For more information check the link [1] below. > >- Amit > >[1] http://forums.codeguru.com/showthread.php?415186-convert-vmlinuz-to-vmlinux _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
