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x86-64 executable format?

From: Alex Waterman
Subject: x86-64 executable format?
Date: Sun, 25 Mar 2007 13:09:16 -0400


Can grub load a x86-64 bit OS image? The image im trying to load is this:

address@hidden kernel]$ file freeGSD
freeGSD: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped

I then bzipped it to be freeGSZ. I then make an ISO image with grub on it (I followed the intructions in the manual) and the OS.
When I fire up grub (with the bochs emulator compiled for 64bit support) I run these commands:

grub> root (cd)
grub> kernel /freeGSD

The root command works fine, it says its loaded an ISO file system and it's using the whole disk.
The kernel command gives me an error 13.

I have made sure its a grub bootable file:

address@hidden kernel]$ mbchk freeGSD
freeGSD: The Multiboot header is found at the offset 4096.
freeGSD: Page alignment is turned on.
freeGSD: Memory information is turned on.
freeGSD: Address fields is turned off.
freeGSD: All checks passed.

However, I put the grub multiboot magic in a non-loading section with a linker script. The rest of the OS
loads at 0x100000.

Is this a problem with the 64 bit nature of the kernel or something else?

Cheers, Alex

Alex Waterman
Support or create OpenSource

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