OSDev.org

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target=$1
target_cpu=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
target_vendor=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
target_os=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`

d_target_os=`echo $target_os | sed 's/^\([A-Za-z_]+\)/\1/'`
case "$d_target_os" in
aix*) d_os_versym=aix ; d_unix=1 ;; 
coff*) ;;
cygwin*) d_os_versym=cygwin ; d_unix=1 ;;
darwin*) d_os_versym=darwin ; d_unix=1 ;;
elf*) ;;
freebsd*) d_os_versym=freebsd ; d_unix=1 ;;
linux*) d_os_versym=linux ; d_unix=1 ;; 
mingw32*) d_os_versym=Win32; d_windows=1 ;;
pe*)    case "$target" in
	    *-skyos*-*) d_os_versym=skyos ; d_unix=1 ;;
	esac
	;;
skyos*) d_os_versym=skyos ; d_unix=1 ;; # Doesn't actually work because SkyOS uses i386-skyos-pe
solaris*) d_os_versym=solaris; d_unix=1 ;;
sysv3*) d_os_versym=sysv3; d_unix=1 ;;
sysv4*) d_os_versym=sysv4; d_unix=1 ;;

*bsd*) d_os_versym=bsd ; d_unix=1 ;;

*) d_os_versym="$d_target_os"
esac

case "$target_cpu" in
alpha*)  d_cpu_versym=Alpha ; d_cpu_versym64=Alpha64 ;;
arm*)    d_cpu_versym=ARM ;;
i*86)    d_cpu_versym=X86   ; d_cpu_versym64=X86_64 ;;
mips*)   d_cpu_versym=MIPS  ; d_cpu_versym64=MIPS64 ;;
*ppc*)   d_cpu_versym=PPC   ; d_cpu_versym64=PPC64 ;;
powerpc*)d_cpu_versym=PPC   ; d_cpu_versym64=PPC64 ;;
sparc*)  d_cpu_versym=SPARC ; d_cpu_versym64=SPARC64 ;;
x86_64)  d_cpu_versym=X86   ; d_cpu_versym64=X86_64 ;;
esac

if test -n "$d_cpu_versym"; then
    echo "#define D_CPU_VERSYM \"$d_cpu_versym\""
fi
if test -n "$d_cpu_versym64"; then
    echo "#define D_CPU_VERSYM64 \"$d_cpu_versym64\""
fi
if test -n "$d_os_versym"; then
    echo "#define D_OS_VERSYM \"$d_os_versym\""
fi

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module kernel.main;

extern(C) void main(uint magic, uint addr)
{
	byte *videoram = cast(byte *)0xb8000;
	videoram[0] = 65;
	videoram[1] = 0x07;
}

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OUTPUT_FORMAT(elf32-i386)
ENTRY(start)
SECTIONS
{
    /* 3GB+1MB virtual / 1MB physical */
    . = 0xC0100000;

    .text : AT(ADDR(.text) - 0xC0000000)
     {
        code = .; _code = .; __code = .;
        *(.text)
        *(.rodata*)
        /*. = ALIGN(4096);*/
    }

    .data ALIGN (0x1000) : AT(ADDR(.data) - 0xC0000000)
    {
        data = .; _data = .; __data = .;
        *(.data)
        /*. = ALIGN(4096);*/

        __CTOR_LIST__ = .; LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) *(.ctors)   LONG(0) __CTOR_END__ = .;
        __DTOR_LIST__ = .; LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) *(.dtors) LONG(0) __DTOR_END__ = .;
    }

    .bss : AT(ADDR(.bss) - 0xC0000000)
    {
        _sbss = .;
        bss = .; _bss = .; __bss = .;
        *(COMMON)
        *(.bss)
        _ebss = .;
        /*. = ALIGN(4096);*/
    }

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

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const char* cygwin_d_os_versym = "MyOS";

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DFLAGS = -nostdlib -nodefaultlibs -g -mcmodel=kernel

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util.o: In function `_D4kernel4core4util4itoaFAaalZAa':
./source/kernel/core/util.d:374: undefined reference to `__umoddi3'
./source/kernel/core/util.d:375: undefined reference to `__udivdi3'

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build.bat -- calls Cygwin's bash and executes the shell script
build.sh -- my shell script that does the compiling and linking
loader.asm -- my assembly stub
main.d
object.d
link.ld -- linker script
build/ -- where my object files go
core/dstubs.d ------- from here on down it's all runtime stuff
core/invariant.d
core/system.d
core/util.d
std/intrinsic.d
std/stdarg.d
std/c/stdarg.d
std/typeinfo/ti_*.d -- 35 files
gcc/builtins.d

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extern(C) void main(uint magic, void *phymbinfo)
{
	ubyte *videoram = cast(ubyte *)0xb8000 + 0xC0000000;
	videoram[0] = 65;
	videoram[1] = 0x07;
}