81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
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/*
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* Copyright (c) 2006-2021, 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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* 2014-12-03 Bernard Add copyright header.
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* 2014-12-29 Bernard Add cplusplus initialization for ARMCC.
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* 2016-06-28 Bernard Add _init/_fini routines for GCC.
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* 2016-10-02 Bernard Add WEAK for cplusplus_system_init routine.
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*/
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#include <rtthread.h>
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#if defined(__ARMCC_VERSION)
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extern void $Super$$__cpp_initialize__aeabi_(void);
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/* we need to change the cpp_initialize order */
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rt_weak void $Sub$$__cpp_initialize__aeabi_(void)
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{
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/* empty */
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}
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#elif defined(__GNUC__) && !defined(__CS_SOURCERYGXX_MAJ__)
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/* The _init()/_fini() routines has been defined in codesourcery g++ lite */
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rt_weak void _init()
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{
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}
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rt_weak void _fini()
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{
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}
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rt_weak void *__dso_handle = 0;
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#endif
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/**
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* @brief This function initializes the C++ runtime environment for ARM and GCC compilers.
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*
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* @note If there is no SHT$$INIT_ARRAY section, calling $Super$$__cpp_initialize__aeabi_() will cause an error
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* in ARMCC compiler. Therefore, this function manually iterates through the base addresses of the
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* SHT$$INIT_ARRAY section to call the constructor functions of each object. In GCC compiler, this function
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* uses the __ctors_start__ and __ctors_end__ global variables to determine the range of constructor function
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* pointers and calls each constructor function of every object in that range.
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*
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* @return Returns 0 if the initialization of the C++ runtime environment is successful. Otherwise, it returns
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* an error code indicating the failure of the operation.
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*/
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rt_weak int cplusplus_system_init(void)
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{
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#if defined(__ARMCC_VERSION)
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/* If there is no SHT$$INIT_ARRAY, calling
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* $Super$$__cpp_initialize__aeabi_() will cause fault. At least until Keil5.12
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* the problem still exists. So we have to initialize the C++ runtime by ourself.
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*/
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typedef void PROC();
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extern const unsigned long SHT$$INIT_ARRAY$$Base[];
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extern const unsigned long SHT$$INIT_ARRAY$$Limit[];
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const unsigned long *base = SHT$$INIT_ARRAY$$Base;
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const unsigned long *lim = SHT$$INIT_ARRAY$$Limit;
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for (; base != lim; base++)
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{
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PROC *proc = (PROC *)((const char *)base + *base);
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(*proc)();
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}
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#elif defined(__GNUC__)
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typedef void(*pfunc)();
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extern pfunc __ctors_start__[];
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extern pfunc __ctors_end__[];
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pfunc *p;
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for (p = __ctors_start__; p < __ctors_end__; p++)
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(*p)();
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#endif
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return 0;
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}
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INIT_COMPONENT_EXPORT(cplusplus_system_init);
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