參考資訊：
https://chromium.googlesource.com/chromiumos/docs/+/HEAD/constants/syscalls.md
https://reverseengineering.stackexchange.com/questions/2869/how-to-use-sysenter-under-linux
System Call
| NR | syscall name | rax | arg0(rdi) | arg1(rsi) | 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 rdi, 1
mov rsi, msg
mov rdx, len
syscall
mov rax, 60
xor rdi, rdi
syscall
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!