elfso.asm
资源名称:nasm-0.98.zip [点击查看]
上传用户:yuppie_zhu
上传日期:2007-01-08
资源大小:535k
文件大小:3k
源码类别:
编译器/解释器
开发平台:
C/C++
- ; test source file for assembling to ELF shared library
- ; build with:
- ; nasm -f elf elfso.asm
- ; ld -shared -o elfso.so elfso.o
- ; test with:
- ; gcc -o elfso elftest.c ./elfso.so
- ; ./elfso
- ; (assuming your gcc is ELF, and you're running bash)
- ; 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:function ; [1]
- GLOBAL greet:function ; [1]
- GLOBAL asmstr:data asmstr.end-asmstr ; [2]
- GLOBAL textptr:data 4 ; [2]
- GLOBAL selfptr:data 4 ; [2]
- GLOBAL integer:data 4 ; [3]
- EXTERN printf ; [10]
- COMMON commvar 4:4 ; [7]
- EXTERN _GLOBAL_OFFSET_TABLE_
- 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 push ebx ; we'll use EBX for GOT, so save it
- call .getgot
- .getgot: pop ebx
- add ebx,_GLOBAL_OFFSET_TABLE_ + $$ - .getgot wrt ..gotpc
- mov eax,[ebx+integer wrt ..got] ; [14]
- mov eax,[eax]
- inc eax
- mov [ebx+localint wrt ..gotoff],eax ; [14]
- mov eax,[ebx+commvar wrt ..got]
- push dword [eax]
- mov eax,[ebx+localptr wrt ..gotoff] ; [13]
- push dword [eax]
- mov eax,[ebx+integer wrt ..got] ; [1] [14]
- push dword [eax]
- lea eax,[ebx+printfstr wrt ..gotoff]
- push eax ; [13]
- call printf wrt ..plt ; [11]
- add esp,16
- pop ebx
- ret
- SECTION .data
- ; a string
- asmstr db 'hello, world', 0 ; [2]
- .end
- ; 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 wrt ..sym ; [15]
- selfptr dd selfptr wrt ..sym ; [16]
- SECTION .bss
- ; an integer
- integer resd 1 ; [3]
- ; a local integer
- localint resd 1 ; [6]