44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
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/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-11-10 RT-Thread The first version
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* 2023-03-13 WangXiaoyao syscall metadata as structure
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*/
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#ifndef __SYSCALL_DATA_H__
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#define __SYSCALL_DATA_H__
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#include <rtthread.h>
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typedef long sysret_t;
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struct rt_syscall_def
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{
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void *func;
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char *name;
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};
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/**
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* @brief signature for syscall, used to locate syscall metadata.
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*
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* We don't allocate an exclusive section in ELF like Linux do
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* to avoid initializing necessary data by iterating that section,
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* which increases system booting time. We signature a pointer
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* just below each syscall entry in syscall table to make it
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* easy to locate every syscall's metadata by using syscall id.
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*/
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#define SYSCALL_SIGN(func) { \
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(void *)(func), \
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&RT_STRINGIFY(func)[4], \
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}
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#define SET_ERRNO(no) rt_set_errno(-(no))
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#define GET_ERRNO() ({int _errno = rt_get_errno(); _errno > 0 ? -_errno : _errno;})
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#define _SYS_WRAP(func) ({int _ret = func; _ret < 0 ? GET_ERRNO() : _ret;})
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#endif /* __SYSCALL_DATA_H__ */
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