155 lines
5.0 KiB
C
155 lines
5.0 KiB
C
/****************************************************************************
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* libs/libc/sched/task_startup.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sched.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <debug.h>
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#ifndef CONFIG_BUILD_KERNEL
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This type defines one entry in initialization array */
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typedef CODE void (*initializer_t)(void);
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/****************************************************************************
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* External References
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****************************************************************************/
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/* _sinit and _einit are symbols exported by the linker script that mark the
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* beginning and the end of the C++ initialization section.
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*/
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extern initializer_t _sinit;
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extern initializer_t _einit;
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/* _stext and _etext are symbols exported by the linker script that mark the
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* beginning and the end of text.
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*/
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extern uintptr_t _stext;
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extern uintptr_t _etext;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: cxx_initialize
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*
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* Description:
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* If C++ and C++ static constructors are supported, then this function
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* must be provided by board-specific logic in order to perform
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* initialization of the static C++ class instances.
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*
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* This function should then be called in the application-specific
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* user_start logic in order to perform the C++ initialization. NOTE
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* that no component of the core NuttX RTOS logic is involved; this
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* function definition only provides the 'contract' between application
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* specific C++ code and platform-specific toolchain support.
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*
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****************************************************************************/
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static void cxx_initialize(void)
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{
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#ifdef CONFIG_HAVE_CXXINITIALIZE
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static int inited = 0;
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if (inited == 0)
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{
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initializer_t *initp;
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sinfo("_sinit: %p _einit: %p _stext: %p _etext: %p\n",
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&_sinit, &_einit, &_stext, &_etext);
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/* Visit each entry in the initialization table */
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for (initp = &_sinit; initp != &_einit; initp++)
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{
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initializer_t initializer = *initp;
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sinfo("initp: %p initializer: %p\n", initp, initializer);
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/* Make sure that the address is non-NULL and lies in the text
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* region defined by the linker script. Some toolchains may put
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* NULL values or counts in the initialization table.
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*/
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if ((FAR void *)initializer >= (FAR void *)&_stext &&
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(FAR void *)initializer < (FAR void *)&_etext)
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{
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sinfo("Calling %p\n", initializer);
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initializer();
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}
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}
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inited = 1;
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}
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#endif
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxtask_startup
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*
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* Description:
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* This function is the user-space, task startup function. It is called
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* from up_task_start() in user-mode.
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*
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* Input Parameters:
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* entrypt - The user-space address of the task entry point
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* argc and argv - Standard arguments for the task entry point
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*
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* Returned Value:
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* None. This function does not return.
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*
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****************************************************************************/
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void nxtask_startup(main_t entrypt, int argc, FAR char *argv[])
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{
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DEBUGASSERT(entrypt);
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/* If C++ initialization for static constructors is supported, then do
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* that first
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*/
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cxx_initialize();
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/* Call the 'main' entry point passing argc and argv, calling exit()
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* if/when the task returns.
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*/
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exit(entrypt(argc, argv));
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}
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#endif /* !CONFIG_BUILD_KERNEL */
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