Mac nasm 汇编入门

下载

brew install nasm

code

SECTION .data

msg: db "hello world", 0x0a

len: equ $-msg

SECTION .text

global _main

kernel:

    syscall

    ret

_main:

    mov rax,0x2000004

    mov rdi,1

    mov rsi,msg

    mov rdx,len

    call kernel

    mov rax,0x2000001

    mov rdi,0

    call kernel

编译

nasm -f macho64 -o asm1.o asm1.asm

错误链接命令
```
ld -o asm1 -e _main asm1.o
```

提示如下

ld: dynamic main executables must link with libSystem.dylib for architecture x86_64

正确链接

# 方式一   -macosx_version_min 10.15你的Mac版本

ld -o asm1 -e _main asm1.o -macosx_version_min 10.15 -static

# 方式二 ，会提示警告 ，如下

ld -o asm1 -e _main asm1.o -macosx_version_min 10.15 -lSystem

警告如下

ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) not allowed in code signed PIE, but used in _main from asm1.o. To fix this warning, don't compile with -mdynamic-no-pic or link with -Wl,-no_pie

巴特西

Mac nasm 汇编入门

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