Problems with basic D OS

[newmangamers]

EDIT: Update code like comments said, also had to change voliatile to synchronized so gdc would work
i have followed this tutorial on a d os bare bones but i am having problems, link: D_Bare_Bones (http://wiki.osdev.org/D_Bare_Bones)

when i run

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ld -T linker.ld -o kernel.bin start.o kernel.main.o

, i get a few errors:

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kernel.main.o: In function `main':
/home/daniel/N3OS/OLD/1.0/kernel.main.d:13: undefined reference to `_d_criticalenter'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:13: undefined reference to `_d_criticalexit'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:16: undefined reference to `_d_criticalenter'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:16: undefined reference to `_d_criticalexit'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:17: undefined reference to `_d_criticalenter'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:17: undefined reference to `_d_criticalexit'
kernel.main.o: In function `kernel.main._D6kernel4main9__modinitFZv':
/home/daniel/N3OS/OLD/1.0/kernel.main.d:1: undefined reference to `_Dmodule_ref'
/home/daniel/N3OS/OLD/1.0/kernel.main.d:1: undefined reference to `_Dmodule_ref'

can some one please tell me how to fix this...

my source code:
start.asm

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global start
extern main        ; Allow main() to be called from the assembly code
extern start_ctors, end_ctors, start_dtors, end_dtors
 
MODULEALIGN        equ        1<<0
MEMINFO            equ        1<<1
FLAGS              equ        MODULEALIGN | MEMINFO
MAGIC              equ        0x1BADB002
CHECKSUM           equ        -(MAGIC + FLAGS)
 
section .text      ; Next is the Grub Multiboot Header
 
align 4
MultiBootHeader:
       dd MAGIC
       dd FLAGS
       dd CHECKSUM
 
STACKSIZE equ 0x4000  ; 16k if you're wondering
 
static_ctors_loop:
   mov ebx, start_ctors
   jmp .test
.body:
   call [ebx]
   add ebx,4
.test:
   cmp ebx, end_ctors
   jb .body
 
start:
       mov esp, STACKSIZE+stack
 
       push eax
       push ebx
 
       call main
 
static_dtors_loop:
   mov ebx, start_dtors
   jmp .test
.body:
   call [ebx]
   add ebx,4
.test:
   cmp ebx, end_dtors
   jb .body
 
 
cpuhalt:
       hlt
       jmp cpuhalt
 
section .bss
align 32
 
stack:
      resb      STACKSIZE

kernel.main.d

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module kernel.main;

extern(C) void main(uint magic, uint addr) {

        int ypos = 0; //Starting points of the cursor
	int xpos = 0;
	const uint COLUMNS = 80; //Screensize
	const uint LINES = 24;

	ubyte* vidmem = cast(ubyte*)0xFFFF8000000B8000; //Video memory address

	for (int i = 0; i < COLUMNS * LINES * 2; i++) { //Loops through the screen and clears it
			synchronized {*(vidmem + i) = 0;}
	}

	synchronized {*(vidmem + (xpos + ypos * COLUMNS) * 2) = 'D' & 0xFF;} //Prints the letter D
	synchronized {*(vidmem + (xpos + ypos * COLUMNS) * 2 + 1) = 0x07;} //Sets the colour for D to be light grey (0x07)

	for (;;) { //Loop forever. You can add your kernel logic here
	} 
}

linker.ld

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OUTPUT_FORMAT(elf32-i386)
ENTRY (start)

SECTIONS{
    . = 0x00100000;

    .text :{
        code = .; _code = .; __code = .;
        *(.text)
        *(.rodata)
    }

    .rodata ALIGN (0x1000) : {
        *(.rodata)
    }

    .data ALIGN (0x1000) : {
        data = .; _data = .; __data = .;
        *(.data)
        start_ctors = .; *(.ctors)   end_ctors = .;
        start_dtors = .; *(.dtors)   end_dtors = .;
    }

    .bss : {
        sbss = .;
        bss = .; _bss = .; __bss = .;
        *(COMMON)
        *(.bss)
        ebss = .;
    }
    end = .; _end = .; __end = .;
}

Thanks in adv for any help

[newmangamers]

also i am running ubuntu, i do not remember the version, i think it is 64bit, unless i installed 32bit for some random reason

[xenos]

I don't know anything about D, but this is certainly wrong:

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import std.stdio;

[Combuster]

It's quite simple actually:

i have followed this tutorial

Your code says you did not. So either fix the question (and probably read all the introduction topics on the wiki beforehand) or actually follow the tutorial.

[newmangamers]

well i had to fix some of the code as it was the 1.0 version of d. and the import makes no diffrence...

[newmangamers]

i will update it later but still it dossent fix the problem.

[Kazinsal]

and the import makes no diffrence...

Yes. Yes it does. You can't use any standard libraries in your kernel. This is true for any programming language.

[newmangamers]

and the import makes no diffrence...

Yes. Yes it does. You can't use any standard libraries in your kernel. This is true for any programming language.

ok, i have update the code. still getting errors
EDIT: also had to change voliatile to synchronized so gdc would work as voliatile is D 1.0 not D 2.0

[newmangamers]

anyone know how to fix it with the changes?

[iansjack]

I don't know D, but it seems fairly obvious to me that the "synchronized" keyword is causing calls to lbrary routines that you are not linking against. I think your mistake is in the use of this keyword - it's not as if you need to be concerned about concurrency here. You can easily check this by looking at the code in the object files.

To use any language for OS development you have to be very familiar with its keywords and the code it produces. This is also true of C, but it tends to pull in less run-time baggage than other languages.

Study the generated code.

[iansjack]

Just for fun I had a little play with D. It is exactly as I supposed; the "synchronized" key word adds calls to a couple of library routines.