#include <sys/syscall.h>

// The x86-64 system call Application Binary Interface (ABI):
//     System call number: RAX
//     Arguments: RDI, RSI, RDX, RCX, R8, R9
//     Return value: RAX
// See also: syscall(2) syscalls(2)

#define syscall3(id, a1, a2, a3) \
    movq $SYS_##id, %rax; \
    movq $a1, %rdi; \
    movq $a2, %rsi; \
    movq $a3, %rdx; \
    syscall

#define syscall2(id, a1, a2)  syscall3(id, a1, a2, 0)
#define syscall1(id, a1)  syscall2(id, a1, 0)

.globl _start
_start:
    syscall3(write, 1, addr1, addr2 - addr1)
    syscall1(exit, 1)

addr1:
    .ascii "\033[01;31mThis is a minimal binary.\033[0m\n"
addr2: