OSDev.org

Posted: **Thu Feb 12, 2015 4:00 pm**

Howdy,

I would like to move myself towards a sustainable build environment. I need some input on how to do that.

Currently I am following bran's kernel development build steps which utilizes DJGPP (I am running on a 64bit machine, I am using dosbox for DJGPP which works but I am hitting hard limits with character amounts that are hindering me)

I know about the article to set up a cross compiler. If I completed this, how would I translate the existing build structure to follow this? (GCC would work, curious about if linking would go the same?)

build script:

Code: Select all

cd src

echo Now assembling, compiling, and linking your kernel:
nasm -f aout -o start.o start.asm
rem Remember this spot here: We will add 'gcc' commands here to compile C sources


gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o main.o main.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o scrn.o scrn.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o gdt.o gdt.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o idt.o idt.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o isrs.o isrs.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o irq.o irq.c

gcc -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o timer.o timer.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o kb.o kb.c

gcc -w -Wall -O -finline-functions -nostdinc -fno-builtin -I../include -c -o string.o string.c

rem This links all your files. Remember that as you add *.o files, you need to
rem add them after start.o. If you don't add them at all, they won't be in your kernel!
ld -T link.ld -o kernel.bin start.o main.o scrn.o gdt.o idt.o isrs.o irq.o timer.o kb.o string.o
echo Cleaning up object files...
copy kernel.bin ..\kernel.bin
del *.o
del *.bin
echo Done!
pause
exit

Posted: **Thu Feb 12, 2015 4:36 pm**

I can point you to some resources I made that show how osdev is decently done on Unix systems:

http://wiki.osdev.org/Meaty_Skeleton - Example initial template operating system, as inspiration on how to structure an OS.
https://gitorious.org/sortie/myos/ - MyOS, the same template as Meaty Skeleton, but developed a little bit further and shows basic things like GDT and IDT, meant to show how basic things are decently done.

You're crazy for using DJGPP, but I commend you for desiring to move on. I suggest you adopt a decent Unix system in the making, if you're using Windows, or at least consider this option seriously.

[This post paid for by the committee to advance sortie's agenda of unix semantics and to abolish technologies that should not be.]

Posted: **Thu Feb 12, 2015 4:40 pm**

sortie wrote:I can point you to some resources I made that show how osdev is decently done on Unix systems:

http://wiki.osdev.org/Meaty_Skeleton - Example initial template operating system, as inspiration on how to structure an OS.
https://gitorious.org/sortie/myos/ - MyOS, the same template as Meaty Skeleton, but developed a little bit further and shows basic things like GDT and IDT, meant to show how basic things are decently done.

You're crazy for using DJGPP, but I commend you for desiring to move on. I suggest you adopt a decent Unix system in the making, if you're using Windows, or at least consider this option seriously.

[This post paid for by the committee to advance sortie's agenda of unix semantics and to abolish technologies that should not be.]

Heh, thanks.

I will work on that tonight. I'll convert to my debian partition and rework from there. Thanks for the advice.

Posted: **Fri Feb 13, 2015 7:50 am**

The changes are mostly cosmetic once you have your cross-compiler set up. gcc becomes i686-elf-gcc, ld becomes i686-elf-ld. You don't actually need a unix for anything in particular.

That said, DJGPP is old and upgrades might expose bugs in your code you would never have encountered otherwise because of optimisation inabilities of such old GCCs.

[The i-have-more-posts committee's wisdom has it that you should learn from unix' mistakes and transcend way beyond it.</countertroll>]

Posted: **Fri Feb 13, 2015 12:58 pm**

Btw, link with your compiler, not the linker, otherwise you don't give the compiler a chance to do useful things.

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