test/cofftest.asm

   1 ; test source file for assembling to COFF
   2 ; build with (under DJGPP, for example):
   3 ;    nasm -f coff cofftest.asm
   4 ;    gcc -o cofftest cofftest.c cofftest.o
   5
   6 ; This file should test the following:
   7 ; [1] Define and export a global text-section symbol
   8 ; [2] Define and export a global data-section symbol
   9 ; [3] Define and export a global BSS-section symbol
  10 ; [4] Define a non-global text-section symbol
  11 ; [5] Define a non-global data-section symbol
  12 ; [6] Define a non-global BSS-section symbol
  13 ; [7] Define a COMMON symbol
  14 ; [8] Define a NASM local label
  15 ; [9] Reference a NASM local label
  16 ; [10] Import an external symbol
  17 ; [11] Make a PC-relative call to an external symbol
  18 ; [12] Reference a text-section symbol in the text section
  19 ; [13] Reference a data-section symbol in the text section
  20 ; [14] Reference a BSS-section symbol in the text section
  21 ; [15] Reference a text-section symbol in the data section
  22 ; [16] Reference a data-section symbol in the data section
  23 ; [17] Reference a BSS-section symbol in the data section
  24
  25           BITS 32
  26           GLOBAL _lrotate       ; [1]
  27           GLOBAL _greet         ; [1]
  28           GLOBAL _asmstr        ; [2]
  29           GLOBAL _textptr       ; [2]
  30           GLOBAL _selfptr       ; [2]
  31           GLOBAL _integer       ; [3]
  32           EXTERN _printf        ; [10]
  33           COMMON _commvar 4     ; [7]
  34
  35           SECTION .text
  36
  37 ; prototype: long lrotate(long x, int num);
  38 _lrotate:                       ; [1]
  39           push ebp
  40           mov ebp,esp
  41           mov eax,[ebp+8]
  42           mov ecx,[ebp+12]
  43 .label    rol eax,1             ; [4] [8]
  44           loop .label           ; [9] [12]
  45           mov esp,ebp
  46           pop ebp
  47           ret
  48
  49 ; prototype: void greet(void);
  50 _greet    mov eax,[_integer]    ; [14]
  51           inc eax
  52           mov [localint],eax    ; [14]
  53           push dword [_commvar]
  54           mov eax,[localptr]    ; [13]
  55           push dword [eax]
  56           push dword [_integer] ; [1] [14]
  57           push dword _printfstr ; [13]
  58           call _printf          ; [11]
  59           add esp,16
  60           ret
  61
  62           SECTION .data
  63
  64 ; a string
  65 _asmstr   db 'hello, world', 0  ; [2]
  66
  67 ; a string for Printf
  68 _printfstr db "integer==%d, localint==%d, commvar=%d"
  69           db 10, 0
  70
  71 ; some pointers
  72 localptr  dd localint           ; [5] [17]
  73 _textptr  dd _greet             ; [15]
  74 _selfptr  dd _selfptr           ; [16]
  75
  76           SECTION .bss
  77
  78 ; an integer
  79 _integer  resd 1                ; [3]
  80
  81 ; a local integer
  82 localint  resd 1                ; [6]