Kernel will not boot

meh · Post by **meh** » Wed Oct 31, 2007 9:30 pm

My operating system kernel will not boot, and I think it is because the kernel loader (the assembly code that calls the main function) will not link with the kernel. Any help would be appreciated.

Alboin · Post by **Alboin** » Wed Oct 31, 2007 9:52 pm

What happens when you try to link the entry code with the kernel? Also, what OS, compiler, language, etc. are you using?

By the by, what boot loader are you using? (eg. GRUB, LILO, etc.)

Brynet-Inc · Post by **Brynet-Inc** » Wed Oct 31, 2007 9:55 pm

What is with first time posters?

Do they honestly think we can read minds? and/or access their source code just by concentrating "really really hard"?

AusZero, Try diagnosing the issue yourself.. most emulators have debugging capabilities that help..

AndrewAPrice · Post by **AndrewAPrice** » Wed Oct 31, 2007 10:04 pm

Brynet-Inc wrote:What is with first time posters?

Do they honestly think we can read minds? and/or access their source code just by concentrating "really really hard"?

AusZero, Try diagnosing the issue yourself.. most emulators have debugging capabilities that help..

Still not as worse as:
"My compiler says my source code has an error. How can I fix this?"

meh · Post by **meh** » Wed Oct 31, 2007 10:10 pm

It doesn't seem to link.

I'm using Windows XP, DJGPP, nasm, C++ ,and Assembly.

I have used many different bootloaders (which haven't worked by the way), but now I'm using this one: http://www.osdever.net/downloads/bootse ... ootf02.zip.

AndrewAPrice · Post by **AndrewAPrice** » Wed Oct 31, 2007 10:11 pm

It would help if you pasted here the commands you use to compile your code, and the error you are receiving.

meh · Post by **meh** » Wed Oct 31, 2007 10:17 pm

I've been using this command: ld -T link.ld -o .\compiled_kernel\KERNEL.bin loader.o kernel.o video.o.

I've not had any errors, but I've tried to link the kernel with and without the loader and the size of the files are the exactly same.

AndrewAPrice · Post by **AndrewAPrice** » Wed Oct 31, 2007 11:55 pm

Can you post the contents of your link.ld file, the loader code, and the commands used to "compile" your code? (You have already posted the command you use to link the kernel.)

meh · Post by **meh** » Thu Nov 01, 2007 11:30 am

The link.ld file:

Code: Select all

OUTPUT_FORMAT("binary")
ENTRY(start)
SECTIONS
{
.text 0x100000 :
{
code = .; _code = .; __code = .;
*(.text)
. = ALIGN(4096);
}

.data :
{
data = .; _data = .; __data = .;
*(.data)
. = ALIGN(4096);
}

.bss :
{
bss = .; _bss = .; __bss = .;
*(.bss)
. = ALIGN(4096);
}

end = .; _end = .; __end = .;
}

The loader code:

Code: Select all

[BITS 32]

[global start]
[extern _main]

start:
call _main
cli
hlt

The commands used to compile the kernel: gxx -c kernel.cpp -fno-builtin -fno-rtti -fno-exceptions

I got some of this off of a tutorial.

Pixion · Post by **Pixion** » Thu Nov 01, 2007 3:55 pm

Is this Brian's kernel tutorial by any chance? I had some issues with the linker script but this was due to the fact that I has to use a cross compiler.

Also, what are the errors you are getting during linking (i.e. the ld step you posted).

Brynet-Inc · Post by **Brynet-Inc** » Thu Nov 01, 2007 4:24 pm

Why did you post twice? lol.. His name is Brandon btw.. aka Bran.

Pyrofan1 · Post by **Pyrofan1** » Thu Nov 01, 2007 5:02 pm

Code: Select all

[BITS 32]

[global start]
[extern _main]

start:
call _main
cli
hlt

where do you set up the stack?

meh · Post by **meh** » Thu Nov 01, 2007 5:19 pm

What do you mean?

Combuster · Post by **Combuster** » Thu Nov 01, 2007 5:29 pm

AusZero wrote:What do you mean?

uhm, have you read Getting Started ?

meh · Post by **meh** » Thu Nov 01, 2007 10:20 pm

Yes I have read getting started, but I don't know much about stacks.