; test source file for assembling to COFF ; build with (under DJGPP, for example): ; nasm -f coff cofftest.asm ; gcc -o cofftest cofftest.c cofftest.o ; This file should test the following: ; [1] Define and export a global text-section symbol ; [2] Define and export a global data-section symbol ; [3] Define and export a global BSS-section symbol ; [4] Define a non-global text-section symbol ; [5] Define a non-global data-section symbol ; [6] Define a non-global BSS-section symbol ; [7] Define a COMMON symbol ; [8] Define a NASM local label ; [9] Reference a NASM local label ; [10] Import an external symbol ; [11] Make a PC-relative call to an external symbol ; [12] Reference a text-section symbol in the text section ; [13] Reference a data-section symbol in the text section ; [14] Reference a BSS-section symbol in the text section ; [15] Reference a text-section symbol in the data section ; [16] Reference a data-section symbol in the data section ; [17] Reference a BSS-section symbol in the data section BITS 32 GLOBAL _lrotate ; [1] GLOBAL _greet ; [1] GLOBAL _asmstr ; [2] GLOBAL _textptr ; [2] GLOBAL _selfptr ; [2] GLOBAL _integer ; [3] EXTERN _printf ; [10] COMMON _commvar 4 ; [7] SECTION .text ; prototype: long lrotate(long x, int num); _lrotate: ; [1] push ebp mov ebp,esp mov eax,[ebp+8] mov ecx,[ebp+12] .label rol eax,1 ; [4] [8] loop .label ; [9] [12] mov esp,ebp pop ebp ret ; prototype: void greet(void); _greet mov eax,[_integer] ; [14] inc eax mov [localint],eax ; [14] push dword [_commvar] mov eax,[localptr] ; [13] push dword [eax] push dword [_integer] ; [1] [14] push dword _printfstr ; [13] call _printf ; [11] add esp,16 ret SECTION .data ; a string _asmstr db 'hello, world', 0 ; [2] ; a string for Printf _printfstr db "integer==%d, localint==%d, commvar=%d" db 10, 0 ; some pointers localptr dd localint ; [5] [17] _textptr dd _greet ; [15] _selfptr dd _selfptr ; [16] SECTION .bss ; an integer _integer resd 1 ; [3] ; a local integer localint resd 1 ; [6]