Question

我已经在一个小型操作系统上工作了一段时间，我已经得到了我需要的所有汇编代码。我可以轻松地在屏幕上绘制矩形和东西，但现在我希望能够更容易地使用它。我一直在做很多研究，但我找不到任何帮助。为了让您对我正在做的事情有一个大概的了解，这里是我想要的一段代码/代码

C代码

extern int drawRect(int x, int y, int width, int height);

int loop(void) {
    drawRect(10, 10, 30, 30);
}

汇编代码

global drawRect

extern loop

drawRect:
    ; Rectangle code here
    ret
; Main OS loop
os_loop:
    ; My other code here
    call loop
    jmp os_loop ; Go back and loop again.
; ect..

但是当我编译并运行它时，我看不到我的矩形。如果它对你有帮助，我正在使用MikeOS内核，并且为了编译，我只是将编译代码修改为此

#!/bin/sh

# This script assembles the MikeOS bootloader, kernel and programs
# with NASM, and then creates floppy and CD images (on Mac OS X)

# Only the root user can mount the floppy disk image as a virtual
# drive (loopback mounting), in order to copy across the files


echo ">>> BlueOS OS X build script - requires nasm and mkisofs"


echo ">>> Assembling bootloader..."

cd MyDirectory

nasm -O0 -f bin bootload/bootload.asm  -o bootload/bootload.bin || exit


echo ">>> Assembling BlueOS kernel and other files..."


cp disk_images/mikeos.flp disk_images/mikeos.dmg

nasm -O0 -f elf kernel.asm -o kernel.bin || exit

cd other

for i in *.asm
do
nasm -O0 -f elf $i -o `basename $i .asm`.bin || exit
done

echo ">>> Assembling C code..."

for i in *.c
do
gcc -ffreestanding -c $i -o `basename $i .c`.o || exit
done

cd ..

echo ">>> Creating floppy..."
cp disk_images/mikeos.flp disk_images/mikeos.dmg


echo ">>> Adding bootloader to floppy image..."

dd conv=notrunc if=bootload/bootload.bin of=disk_images/mikeos.dmg || exit


echo ">>> Copying BlueOS kernel and programs..."


dev=`hdid -nobrowse -nomount disk_images/mikeos.dmg`
mkdir tmp-loop && mount -t msdos ${dev} tmp-loop && cp kernel.bin tmp-loop/


echo ">>> Unmounting loopback floppy..."

diskutil unmount tmp-loop || exit
hdiutil detach ${dev}

rm -rf tmp-loop


echo ">>> BlueOS floppy image is disk_images/mikeos.dmg"


echo ">>> Creating CD-ROM ISO image..."

rm -f disk_images/mikeos.iso
mkisofs -quiet -V 'MIKEOS' -input-charset iso8859-1 -o disk_images/mikeos.iso -b mikeos.dmg disk_images/ || exit

echo '>>> Done!'

侧面说明：我在Mac OS X上，如果这对任何事都有所帮助。侧面问题：是否可以使用C ++代替C？我是OOP的粉丝。

Answer 1

混合C和汇编取决于编译器如何配置来处理参数。如果你正在使用gcc，它还取决于你是否正在构建16/32/64位。 C ++也是如此。有关详情，请参阅http://en.wikipedia.org/wiki/X86_calling_conventions。

NAS与C混合

1 个答案: