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; test source file for assembling to binary files
; build with:
; nasm -f bin -o bintest.com bintest.asm
; When run (as a DOS .COM file), this program should print
; hello, world
; on two successive lines, then exit cleanly.
; This file should test the following:
; [1] Define a text-section symbol
; [2] Define a data-section symbol
; [3] Define a BSS-section symbol
; [4] Define a NASM local label
; [5] Reference a NASM local label
; [6] Reference a text-section symbol in the text section
; [7] Reference a data-section symbol in the text section
; [8] Reference a BSS-section symbol in the text section
; [9] Reference a text-section symbol in the data section
; [10] Reference a data-section symbol in the data section
; [11] Reference a BSS-section symbol in the data section
BITS 16
ORG 0x100
SECTION .text
jmp start ; [6]
end mov ax,0x4c00 ; [1]
int 0x21
start mov byte [bss_sym],',' ; [1] [8]
mov bx,[bssptr] ; [7]
mov al,[bx]
mov bx,[dataptr] ; [7]
mov [bx],al
mov cx,2
.loop mov dx,datasym ; [1] [4] [7]
mov ah,9
push cx
int 0x21
pop cx
loop .loop ; [5] [6]
mov bx,[textptr] ; [7]
jmp bx
SECTION .data
datasym db 'hello world', 13, 10, '$' ; [2]
bssptr dw bss_sym ; [2] [11]
dataptr dw datasym+5 ; [2] [10]
textptr dw end ; [2] [9]
SECTION .bss
bss_sym resb 1 ; [3]
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