1 ; test source file for assembling to binary files 2 ; build with: 3 ; yasm -f bin -o bintest.com bintest.asm 4 5 ; When run (as a DOS .COM file), this program should print 6 ; hello, world 7 ; on two successive lines, then exit cleanly. 8 9 ; This file should test the following: 10 ; [1] Define a text-section symbol 11 ; [2] Define a data-section symbol 12 ; [3] Define a BSS-section symbol 13 ; [4] Define a NASM local label 14 ; [5] Reference a NASM local label 15 ; [6] Reference a text-section symbol in the text section 16 ; [7] Reference a data-section symbol in the text section 17 ; [8] Reference a BSS-section symbol in the text section 18 ; [9] Reference a text-section symbol in the data section 19 ; [10] Reference a data-section symbol in the data section 20 ; [11] Reference a BSS-section symbol in the data section 21 22 [BITS 16] 23 [ORG 0x100] 24 25 [SECTION .text] 26 27 jmp start ; [6] 28 29 endX mov ax,0x4c00 ; [1] 30 int 0x21 31 32 start mov byte [bss_sym],',' ; [1] [8] 33 mov bx,[bssptr] ; [7] 34 mov al,[bx] 35 mov bx,[dataptr] ; [7] 36 mov [bx],al 37 mov cx,2 38 .loop mov dx,datasym ; [1] [4] [7] 39 mov ah,9 40 push cx 41 int 0x21 42 pop cx 43 loop .loop ; [5] [6] 44 mov bx,[textptr] ; [7] 45 jmp bx 46 47 [SECTION .data] 48 49 datasym db 'hello world', 13, 10, '$' ; [2] 50 bssptr dw bss_sym ; [2] [11] 51 dataptr dw datasym+5 ; [2] [10] 52 textptr dw endX ; [2] [9] 53 54 [SECTION .bss] 55 56 bss_sym resb 1 ; [3] 57
