Basic assembly Hello World example for macOS on Apple Silicon/arm64

README.md

To compile:

as -o hello.o hello.s
ld -o hello hello.o -lSystem -syslibroot `xcrun -sdk macosx --show-sdk-path` -e _main -arch arm64

./hello

hello.s

.global _main
.align 2

_main:
    mov x0, #1                 // file descriptor (1 for stdout)
    adrp x1, message@PAGE      // load the address of the string
    add x1, x1, message@PAGEOFF
    mov x2, #14                // length
    mov x16, #0x04             // syscall number for write
    svc 0                      // make the syscall

    mov x0, #0                 // exit code 0
    mov x16, #0x01             // syscall number for exit
    svc 0                      // make the syscall

.section __TEXT,__cstring
message:
    .asciz "Hello, World!\n"