參考資訊：
https://chromium.googlesource.com/chromiumos/docs/+/HEAD/constants/syscalls.md
System Call
| NR | syscall name | rax | arg0(rbx) | arg1(rcx) | arg2(rdx) |
|---|---|---|---|---|---|
| 1 | write | 1 | unsigned int fd | const char *buf | size_t count |
| 60 | exit | 60 | int error_code |
main.s
global _start
section .data
msg db "hello, world!", 10
len equ $ - msg
section .text
_start:
mov rax, 1
mov rbx, 1
mov rcx, msg
mov rdx, len
int 0x80
mov rax, 60
mov rbx, 0
int 0x80
編譯、執行
$ nasm -f elf64 main.s
$ x86_64-linux-gnu-gcc main.o -o main -nostdlib -static
$ qemu-x86_64 ./main
hello, world!