C++ OS Programming

[Cmaranec]

Do you have a knowledge of OS programming in C++(under Windows)?? Which compilers do you use and which commands do you use for compile. Please, place here a link to download them. thx

PS: Please excuse my formulation, because i am czechian.

[Mike]

I'm writing my OS in C++ in Microsoft Visual Studio 2005. (With FASM for the bootloader and protected-mode-entry stub) Check out "Visual C" on the wiki which details some of the issues I faced.

> PS: Please excuse my formulation, because i am czechian.

Cool! I am half-Czech... but unfortunately all I know of the language are the numbers 1-10, "good day", and "beer".

Mike

[Cmaranec]

Which compilers and linkers do you use? If you use DJGPP please tell me what version.

[Daedalus]

DJGPP of any version seems to work fine for me.

[Cmaranec]

4 Daedalus: Which commands do you use to compile the kernel of your OS?? I am using:

@ECHO OFF

echo Kompiluji kernel...

c:\dev-cpp\bin\gcc -w -nostdlib -fno-builtin -ffreestanding -c -o kernel32.o kernel32.cpp

echo Kompiluji loader...

c:\compiler\nasm -f aout Loader.asm -o Loader.o

echo Linkuji...

c:\dev-cpp\bin\ld -o Kernel.bin Loader.o Kernel32.o

echo Proces dokoncen...

pause

And cmd.exe gave back: Loader.o: File not recognized: File format not recognized

What i do wrong?

[inflater]

Try this:

Code: Select all

echo Kompilujem loader...

c:\compiler\nasm -f bin Loader.asm -o Loader.o

echo Linkujem...

c:\dev-cpp\bin\ld -oformat BINARY -o Kernel.bin Loader.o Kernel32.o

I am full Slovak, full Czech, "sort of a English'er" and "Ich spreche auch Deutsch, bitte !"

Slovensko pozdravuje Česko !

inflater

[Cmaranec]

Now, it throw

Kompiluji kernel...
Kompiluji loader...
Loader.asm:6: error: binary output format does not support external references
Linkuji...
c:\dev-cpp\bin\ld: target BINARY not found
Proces dokoncen...
Pokračujte stisknutím libovolné klávesy...

Česko zdraví Slovensko!

[Combuster]

Uner windows you have three standard choices: GCC (cross-compiler, perhaps) MSVC and Watcom
I personally use the GCC cross-compiler, but you should check the wiki on how to use each of them, since the compilers, linkers and assemblers are generally not interoperable by default.

On another note, nasm generates binary output in this construction, not object files.
you should use

Code: Select all

nasm -f elf -o loader.o loader.asm

change "elf" with a different format to change the output. you may want to try "coff" if you use something else than gnu ld
(try "nasm -hf" to see what nasm can give you)

Something similar goes for the ld, where the parameter should probably read "--otarget binary", case sensitive.

[Cmaranec]

In linking procces is something wrong:

Kompiluji kernel...
Kompiluji loader...
Linkuji...
Kernel32.o(.text+0xd):kernel32.cpp: undefined reference to `std::string::size()
const'
Kernel32.o(.text+0x60):kernel32.cpp: undefined reference to `std::string::operat
or[](unsigned int) const'
Kernel32.o(.text+0x9f):kernel32.cpp: undefined reference to `std::string::operat
or[](unsigned int) const'
Kernel32.o(.text+0xce):kernel32.cpp: undefined reference to `std::string::operat
or[](unsigned int) const'
Kernel32.o(.text+0x121):kernel32.cpp: undefined reference to `_alloca'
Kernel32.o(.text+0x126):kernel32.cpp: undefined reference to `__main'
Kernel32.o(.text+0x135):kernel32.cpp: undefined reference to `std::cout'
Kernel32.o(.text+0x13a):kernel32.cpp: undefined reference to `std::basic_ostream
<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::
basic_ostream<char, std::char_traits<char> >&, char const*)'
Kernel32.o(.text+0x163):kernel32.cpp: undefined reference to `std::ios_base::Ini
t::Init()'
Kernel32.o(.text+0x17e):kernel32.cpp: undefined reference to `std::ios_base::Ini
t::~Init()'
Proces dokoncen...
Pokračujte stisknutím libovolné klávesy...

I use "nasm -f elf Loader.asm -o Loader.o".
Loader.o is succesfully compiled and linked, but in Kernel32.o is bug...

[Cmaranec]

I have a linker script from wiki. When i used the old classic linker script, it wrote "PE operations on non PE file". I use script from wiki.

[bluecode]

You have to build a crosscompiler under windows if you want to use the elf file format for your os. There is also an article on the wiki about that.

[Cmaranec]

Can you (or anybody other) send me an example of your simple OS with .BAT file??? It will be better.

[Pype.Clicker]

it sounds like you're missing the string class and COUT stuff to have your kernel running. You know you cannot simply reuse the standard library of your hosting OS, don't you?

[Cmaranec]

Yes, i know. How i insert this classes to my kernel?

[bluecode]

Make your own std::string class or port an existing C++ library. I don't recommend the later one at your stage, it's just to much C++ runtime required (exception handling, RTTI).