用nasm汇编器汇编不同位数格式的ELF

最新推荐文章于 2025-12-05 12:09:12 发布

原创最新推荐文章于 2025-12-05 12:09:12 发布 · 371 阅读

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#汇编 #fasm #nasm #elf32 #elf64

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在网上找到一个把32位汇编程序转为64位的存储库，
https://codeload.github.com/theadityalunawat/assembler_converter/zip/refs/heads/master
把代码下载下来以后，
32_bit.asm

extern printf
global main

section .data
	message db "Hello World", 10, 0

section .text

main:
	pushad
	push dword message
	call printf
	add esp, 4
	popad
	ret

64_bit.asm

global _start

section .data
	message db "Hello Cloud!",10 , 0

section .text
_start:
	mov rax,1
	mov rdi,1
	mov rsi, message
	mov rdx, 13
	syscall
	mov rax, 60
	mov rdi, 0
	syscall

先用fasm程序汇编
结果报各种错误

./fasm asmcov/32_bit.asm
flat assembler  version 1.73.32  (16384 kilobytes memory)
asmcov/32_bit.asm [1]:
extern printf
processed: extern printf
error: illegal instruction.

./fasm -f elf64 asmcov/64_bit.asm
flat assembler  version 1.73.32
usage: fasm <source> [output]
optional settings:
 -m <limit>         set the limit in kilobytes for the available memory
 -p <limit>         set the maximum allowed number of passes
 -d <name>=<value>  define symbolic variable
 -s <file>          dump symbolic information for debugging
 
./fasm.x64 asmcov/64_bit.asm
flat assembler  version 1.73.32  (16384 kilobytes memory, x64)
asmcov/64_bit.asm [1]:
global _start
processed: global _start
error: illegal instruction.

到nasm主页下载了源代码
编译安装很简单./configure 和 make就行了。

# nasm-2.16.03/nasm asmcov/64_bit.asm
asmcov/64_bit.asm:8: error: instruction not supported in 16-bit mode
asmcov/64_bit.asm:9: error: instruction not supported in 16-bit mode
asmcov/64_bit.asm:10: error: instruction not supported in 16-bit mode
asmcov/64_bit.asm:11: error: instruction not supported in 16-bit mode
asmcov/64_bit.asm:13: error: instruction not supported in 16-bit mode
asmcov/64_bit.asm:14: error: instruction not supported in 16-bit mode

直接汇编出错，加了-f选项就可以汇编出.o文件了，注意它和asm默认保存在同一个目录下，按照assembler_converter源码中README的步骤链接成功，执行结果正确。

# nasm-2.16.03/nasm -f elf64 asmcov/64_bit.asm

# nasm-2.16.03/nasm -f elf32 asmcov/32_bit.asm
# ld 64_bit.o -o 64_bit_run
ld: cannot find 64_bit.o: No such file or directory
# ld asmcov/64_bit.o -o 64_bit_run
# ./64_bit_run
Hello Cloud!
# gcc-12 -m32 asmcov/32_bit.o -o 32_bit_run
/usr/bin/ld: warning: asmcov/32_bit.o: missing .note.GNU-stack section implies executable stack
/usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
/usr/bin/ld: asmcov/32_bit.o: warning: relocation in read-only section `.text'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
# ./32_bit_run
Hello World

但是用他的翻译器翻译的结果，虽然通过了汇编，但链接警告，执行也卡住，看来是无法工作的。

# g++ asmcov/translator.cpp
# cd asmcov

/asmcov# ../a.out
new 64 bit file has been created
/asmcov# cd ..
# nasm-2.16.03/nasm -f elf64 asmcov/64_bit_conv.asm
# ld asmcov/64_bit_conv.o -o 64_bit_conv_run
ld: warning: cannot find entry symbol _start; defaulting to 0000000000401000
# ./64_bit_conv_run
^C