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Posted: **Fri Jul 13, 2007 12:06 am**

I followed Bran's kernel development tutorial from http://www.osdever.net/bkerndev/Docs/whatsleft.htm. I changed file "start.asm" in nasm to my own loader in gas. I also made other changes.

The problem is that the kernel can only print out a hello message. The interrupt and exception handlers are not working. Normally, the "timer_handler" should be called in every second and print out messages.

Don't know how to debug this problem. Have been spending a long time on it. Can you please help with this problem? I included my source code in a tar file.

Thanks!!!

Posted: **Fri Jul 13, 2007 12:26 am**

When I convert nasm to gas, one problem is that I cannot convert "push byte 0" in nasm to "pushb $0" in gas. The as compiler always complains. So, I had to change "pushb $0" to "push $0". Is this right??

Posted: **Fri Jul 13, 2007 12:41 am**

fei wrote:When I convert nasm to gas, one problem is that I cannot convert "push byte 0" in nasm to "pushb $0" in gas. The as compiler always complains. So, I had to change "pushb $0" to "push $0". Is this right??

yep, or you could do pushw.

Posted: **Fri Jul 13, 2007 12:45 am**

I converted Bran's tutorial to GAS syntax. PM me if you want some help

The ISR/IRQ stubs are like so:

Code: Select all

#  0: Divide By Zero Exception
isr0:
    cli
    pushl $0
    pushl $0
    jmp isr_common_stub

Good luck

Posted: **Fri Jul 13, 2007 1:03 am**

I tried to use "pushl $0" to replace "push btye 0" in nasm. After the changes, my kernel can't even print out the hello message. Don't know what is the problem.

Posted: **Fri Jul 13, 2007 9:15 am**

I suggest you compare the disassemblies of both the nasm and the gas versions to see the differences. That way you'd know where to look for translation bugs.

OSDev.org

Need help with my kernel

Need help with my kernel