/*
 * Copyright (c) 2020 AIIT XUOS Lab
 * XiUOS is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *        http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
#include "usyscall.h"

int syscall(int sys_num, intptr_t a1, intptr_t a2, intptr_t a3, intptr_t a4)
{
    int ret = -1;

    __asm__ volatile(
        "mov r0, %1;\
        mov r1, %2;\
        mov r2, %3;\
        mov r3, %4;\
        mov r4, %5;\
        swi 0;\
        dsb;\
        isb;\
        mov %0, r0"
        : "=r"(ret)
        : "r"(sys_num), "r"(a1), "r"(a2), "r"(a3), "r"(a4)
        : "memory", "r0", "r1", "r2", "r3", "r4");

    return ret;
}