98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/****************************************************************************
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* arch/misoc/src/minerva/minerva_stackframe.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 <sys/types.h>
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#include <stdint.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include "minerva.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_stack_frame
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*
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* Description:
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* Allocate a stack frame in the TCB's stack to hold thread-specific data.
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* This function may be called anytime after up_create_stack() or
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* up_use_stack() have been called but before the task has been started.
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*
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* Thread data may be kept in the stack (instead of in the TCB) if it is
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* accessed by the user code directly. This includes such things as
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* argv[]. The stack memory is guaranteed to be in the same protection
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* domain as the thread.
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*
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* The following TCB fields will be re-initialized:
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*
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* - adj_stack_size: Stack size after removal of the stack frame from
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* the stack
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* - stack_base_ptr: Adjusted stack base pointer after the TLS Data and
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* Arguments has been removed from the stack allocation.
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*
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* Input Parameters:
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* - tcb: The TCB of new task
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* - frame_size: The size of the stack frame to allocate.
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*
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* Returned Value:
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* - A pointer to bottom of the allocated stack frame. NULL will be
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* returned on any failures. The alignment of the returned value is
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* the same as the alignment of the stack itself.
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*
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****************************************************************************/
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void *up_stack_frame(struct tcb_s *tcb, size_t frame_size)
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{
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void *ret;
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/* Align the frame_size */
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frame_size = STACK_ALIGN_UP(frame_size);
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/* Is there already a stack allocated? Is it big enough? */
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if (!tcb->stack_alloc_ptr || tcb->adj_stack_size <= frame_size)
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{
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return NULL;
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}
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ret = tcb->stack_base_ptr;
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memset(ret, 0, frame_size);
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/* Save the adjusted stack values in the struct tcb_s */
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tcb->stack_base_ptr = (uint8_t *)tcb->stack_base_ptr + frame_size;
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tcb->adj_stack_size -= frame_size;
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/* And return the pointer to the allocated region */
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return ret;
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}
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