我有个奇怪的问题
➜ ASM git:(master) ✗ ./Colleen
DEFAULT REL
SECTION .text
global _main
extern _printf
_main:
push rbx
lea rdi, [code]
mov rsi, 10
mov rdx, 34
lea rcx, [code]
xor rax, rax
call _printf
quit:
mov eax, 0x2000001
xor edi, edi
syscall ;end
code: "DEFAULT REL%1$cSECTION .text%1$cglobal _main%1$cextern _printf%1$c_main:%1$c push rbx%1$c lea rdi, [code]%1$c mov rsi, 10%1$c mov rdx, 34%1$c lea rcx, [code]%1$c xor rax, rax%1$c call _printf%1$cquit:%1$c mov eax, 0x2000001%1$c xor edi, edi%1$c syscall ;end%1$c%1$ccode: %2$c%3$s%2$c, 0%1$c", 0
➜ ASM git:(master) ✗ ./Colleen > a
➜ ASM git:(master) ✗ cat a
➜ ASM git:(master) ✗
标准输出似乎不能重定向到文件。输出是由一个简单的printf,和任何其他方式产生的输出工作很好,但我的程序集是错误的。我在Debian上也做了同样的事情,但我也有同样的结果。
MacOS源代码:
DEFAULT REL
SECTION .text
global _main
extern _printf
_main:
push rbx
lea rdi, [code]
mov rsi, 10
mov rdx, 34
lea rcx, [code]
xor rax, rax
call _printf
quit:
mov eax, 0x2000001
xor edi, edi
syscall ;end
code: db "DEFAULT REL%1$cSECTION .text%1$cglobal _main%1$cextern _printf%1$c_main:%1$c push rbx%1$c lea rdi, [code]%1$c mov rsi, 10%1$c mov rdx, 34%1$c lea rcx, [code]%1$c xor rax, rax%1$c call _printf%1$cquit:%1$c mov eax, 0x2000001%1$c xor edi, edi%1$c syscall ;end%1$c%1$ccode: %2$c%3$s%2$c, 0%1$c", 0
汇编:
nasm -f macho64 Colleen.asm
clang -nostartfiles -arch x86_64 Colleen.o -o Colleen
Linux elf64源代码
DEFAULT REL
SECTION .rodata
code: db "DEFAULT REL%1$cSECTION .rodata%1$ccode: db %2$c%3$s%2$c%1$c%1$cSECTION .text%1$cextern printf%1$cglobal _start%1$c_start:%1$c mov edi, code%1$c mov esi, 10%1$c mov edx, 34%1$c mov ecx, code%1$c xor eax, eax%1$c call printf%1$c%1$c mov eax, 60%1$c xor edi, edi%1$c syscall ;end%1$c"
SECTION .text
extern printf
global _start
_start:
mov edi, code
mov esi, 10
mov edx, 34
mov ecx, code
xor eax, eax
call printf
mov eax, 60
xor edi, edi
syscall ;end
汇编:
nasm -f elf64 Colleen.asm
gcc -no-pie -nostartfiles Colleen.o -o Colleen
谢谢你的帮助!
发布于 2020-07-12 21:02:16
退出程序的正确方法是使用调用退出libc函数,而不是使用原始syscall。
https://stackoverflow.com/questions/62866295
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