M2-Planet/test/common_aarch64/functions/putchar.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/>.
 */

void putchar(int c)
{
	asm("SET_X0_FROM_BP" "SUB_X0_8"
	    "SET_X1_FROM_X0"
	    "SET_X0_TO_1"
	    "SET_X2_TO_1"
	    "SET_X8_TO_SYS_WRITE"
	    "SYSCALL");
}