Mac nasm 匯編入門

下載

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

• 編譯

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

• 錯誤鏈接命令

  ld -o asm1 -e _main asm1.o 
  

• 提示如下

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

• 正確鏈接

# 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 ，會提示警告 ，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