Mulyadi Santosa wrote:
Hi...
On Mon, Jul 6, 2009 at 8:04 PM, luca ellero<lroluk@xxxxxxxxx> wrote:
Hi all,
I'm trying to debug/trace early stages of kernel boot on x86 (just for fun
and learning). I mean very first stages when CPU is still in real-mode.
Since tools like printk/kdb/kgdb are not available at this early stages, the
best solution I found is using the debug program freedos with
freedos/loadlin.
I wonder if somebody have ever used this method and can give me some
suggestions (for example how to fix breakpoints or what happens when
switching to protected mode) or can suggest me some alternative methods
(maybe gdb+kexec?).
I have no experience in such area, but have you tried Qemu? Try to
hook gdb into Qemu's gdb stub. It's kinda controlling normal program
via gdb though.
Or if that's not sufficient, I think you need to go with Bochs. I read
it at a glance, seems Bochs is the only tools that provide with
detailed per instruction debugging.
CMIIW people...
regards,
Mulyadi.
Thank you Mulyadi for your suggestions.
I will have a look at these tools.
regards
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