|
10554
|
1 ; test source file for assembling to ELF
|
|
|
2 ; build with:
|
|
|
3 ; nasm -f elf elftest.asm
|
|
|
4 ; gcc -o elftest elftest.c elftest.o
|
|
|
5 ; (assuming your gcc is ELF)
|
|
|
6
|
|
|
7 ; This file should test the following:
|
|
|
8 ; [1] Define and export a global text-section symbol
|
|
|
9 ; [2] Define and export a global data-section symbol
|
|
|
10 ; [3] Define and export a global BSS-section symbol
|
|
|
11 ; [4] Define a non-global text-section symbol
|
|
|
12 ; [5] Define a non-global data-section symbol
|
|
|
13 ; [6] Define a non-global BSS-section symbol
|
|
|
14 ; [7] Define a COMMON symbol
|
|
|
15 ; [8] Define a NASM local label
|
|
|
16 ; [9] Reference a NASM local label
|
|
|
17 ; [10] Import an external symbol
|
|
|
18 ; [11] Make a PC-relative call to an external symbol
|
|
|
19 ; [12] Reference a text-section symbol in the text section
|
|
|
20 ; [13] Reference a data-section symbol in the text section
|
|
|
21 ; [14] Reference a BSS-section symbol in the text section
|
|
|
22 ; [15] Reference a text-section symbol in the data section
|
|
|
23 ; [16] Reference a data-section symbol in the data section
|
|
|
24 ; [17] Reference a BSS-section symbol in the data section
|
|
|
25 ; [18] Define a non-global rodata-section symbol
|
|
|
26
|
|
|
27 BITS 32
|
|
|
28 GLOBAL lrotate ; [1]
|
|
|
29 GLOBAL greet ; [1]
|
|
|
30 GLOBAL asmstr ; [2]
|
|
|
31 GLOBAL textptr ; [2]
|
|
|
32 GLOBAL selfptr ; [2]
|
|
|
33 GLOBAL integer ; [3]
|
|
|
34 EXTERN printf ; [10]
|
|
|
35 COMMON commvar 4 ; [7]
|
|
|
36
|
|
|
37 SECTION .text
|
|
|
38
|
|
|
39 ; prototype: long lrotate(long x, int num);
|
|
|
40 lrotate: ; [1]
|
|
|
41 push ebp
|
|
|
42 mov ebp,esp
|
|
|
43 mov eax,[ebp+8]
|
|
|
44 mov ecx,[ebp+12]
|
|
|
45 .label rol eax,1 ; [4] [8]
|
|
|
46 loop .label ; [9] [12]
|
|
|
47 mov esp,ebp
|
|
|
48 pop ebp
|
|
|
49 ret
|
|
|
50
|
|
|
51 ; prototype: void greet(void);
|
|
|
52 greet mov eax,[integer] ; [14]
|
|
|
53 inc eax
|
|
|
54 mov [localint],eax ; [14]
|
|
|
55 push dword [commvar]
|
|
|
56 mov eax,[localptr] ; [13]
|
|
|
57 push dword [eax]
|
|
|
58 push dword [integer] ; [1] [14]
|
|
|
59 push dword printfstr ; [13]
|
|
|
60 call printf ; [11]
|
|
|
61 add esp,16
|
|
|
62 ret
|
|
|
63
|
|
|
64 SECTION .data
|
|
|
65
|
|
|
66 ; a string
|
|
|
67 asmstr db 'hello, world', 0 ; [2]
|
|
|
68
|
|
|
69 ; a string for Printf
|
|
|
70 printfstr db "integer==%d, localint==%d, commvar=%d"
|
|
|
71 db 10, 0
|
|
|
72
|
|
|
73 ; some pointers
|
|
|
74 localptr dd localint ; [5] [17]
|
|
|
75 textptr dd greet ; [15]
|
|
|
76 selfptr dd selfptr ; [16]
|
|
|
77
|
|
|
78 SECTION .bss
|
|
|
79
|
|
|
80 ; an integer
|
|
|
81 integer resd 1 ; [3]
|
|
|
82
|
|
|
83 ; a local integer
|
|
|
84 localint resd 1 ; [6]
|
|
|
85
|
|
|
86 SECTION .rodata
|
|
|
87 readonly dd readonly ; [18]
|
