M1 macs don't use a traditional x86_64 architecture, but a custom ARM64 architecture. This is a simple program that prints "Hello, World!" to the console.

• syscall is the M1 equivalent of int 0x80 on x86_64.
• The syscall number for write is 0x2000004.
• The syscall number for exit is 0x2000001.

• nasm needs the -f macho64 flag, which is the M1 equivalent of -f elf64 on x86_64.
• ld needs the following flags :
  • -macosx_version_min 11.0,
  • -L /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib/,
  • -lc,
  • -e _start : entry point of the program.
  • -no_pie : disable Position Independent Executable.

make
./exec