M2-Planet/test/common_aarch64/functions/getchar.c

/* Copyright (C) 2020 deesix <deesix@tuta.io>
 * This file is part of M2-Planet.
 *
 * M2-Planet is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * M2-Planet is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with M2-Planet.  If not, see <http://www.gnu.org/licenses/>.
 */

int getchar()
{
	asm("SET_X0_TO_0"
	    "PUSH_X0"
	    "SET_X1_FROM_SP"
	    "SET_X2_TO_1"
	    "SET_X8_TO_SYS_READ"
	    "SYSCALL"
	    "SET_X1_TO_0"
	    "CMP_X1_X0"
	    "POP_X0"
	    "SKIP_INST_NE"
	    "SET_X0_TO_MINUS_1");
}