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