test/nolibc.c

#include <sys/syscall.h>

void _start() {
    long _ret;
    __asm__ volatile (                             \
        "syscall"                                  \
        : "=a" (_ret)                              \
        : "a" (__NR_exit), "D" (0)                 \
        : "rcx", "r11", "memory", "cc"             \
    ); // exit(0);
}