syscall_raw
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
tid = syscall_raw(SYS_gettid, 0, 0, 0, 0, 0, 0);
syscall_raw(SYS_tkill, tid, SIGUSR2, 0, 0, 0, 0);
syscall_raw(SYS_sigaltstack, (long)stack, 0, 0, 0, 0, 0);
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
syscall_raw(SYS_write, 1, (long) str, sizeof(str) - 1, 0, 0, 0);
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
ret = syscall_raw(SYS_tkill, child_pid, 0, 0, 0, 0, 0);
return syscall_raw(SYS_clone, a1, a2, a3, a4, a5, 0);