forked from xuos/xiuos
34 lines
980 B
C
34 lines
980 B
C
/*
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* Copyright (c) 2020 AIIT XUOS Lab
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* XiUOS is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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*/
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#include "usyscall.h"
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int syscall(int sys_num, intptr_t a1, intptr_t a2, intptr_t a3, intptr_t a4)
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{
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int ret = -1;
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__asm__ volatile(
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"mov r0, %1;\
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mov r1, %2;\
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mov r2, %3;\
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mov r3, %4;\
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mov r4, %5;\
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swi 0;\
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dsb;\
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isb;\
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mov %0, r0"
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: "=r"(ret)
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: "r"(sys_num), "r"(a1), "r"(a2), "r"(a3), "r"(a4)
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: "memory", "r0", "r1", "r2", "r3", "r4");
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return ret;
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}
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