assembly Tutorials

Creating disk image

nasm boot.asm -f bin -o boot.bin
dd if=boot.bin of=/dev

Running the binary in QEMU

If you don't have an old machine with floppy drive you can still go through the tutorial by using QEMU.

qemu-system-i386 -fda boot.bin

Use the QEMU monitor command to send Ctrl-Alt-Del to the VM:

sendkey ctrl-alt-delete

汇编语言hello world入门

[ORG 0x7c00]
   xor ax, ax  ;make it zero
   mov ds, ax
   cld        ;Clear Direction Flag
 
   mov si, msg
   call bios_print
 
hang:
   jmp hang
 
msg: 
    db 'Hello World', 13, 10, 0
 
bios_print:
   lodsb
   or al, al  ;zero=end of str
   jz done    ;get out
   mov ah, 0x0E
   mov bh, 0
   int 0x10
   jmp bios_print
done:
   ret
 
   times 510-($-$$) db 0    ;NASM's way of saying fill up 512 bytes with zeroes
   db 0x55,0xAA            ;boot signature

制作make文件

#vim Makefile
boot.bin:boot.asm
    nasm boot.asm -f bin -o boot.bin

run:boot.bin
    qemu-system-i386 -fda boot.bin

程序启动命令

make run