145 lines
5.2 KiB
C
145 lines
5.2 KiB
C
/****************************************************************************
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* arch/xtensa/src/common/xtensa_usestack.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/kmalloc.h>
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#include <nuttx/arch.h>
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#include "xtensa.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* XTENSA requires at least a 4-byte stack alignment. For floating point use,
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* however, the stack must be aligned to 8-byte addresses.
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*/
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#ifdef CONFIG_LIBC_FLOATINGPOINT
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# define STACK_ALIGNMENT 8
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#else
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# define STACK_ALIGNMENT 4
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#endif
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/* Stack alignment macros */
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#define STACK_ALIGN_MASK (STACK_ALIGNMENT-1)
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#define STACK_ALIGN_DOWN(a) ((a) & ~STACK_ALIGN_MASK)
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#define STACK_ALIGN_UP(a) (((a) + STACK_ALIGN_MASK) & ~STACK_ALIGN_MASK)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_use_stack
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*
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* Description:
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* Setup up stack-related information in the TCB using pre-allocated stack
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* memory. This function is called only from task_init() when a task or
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* kernel thread is started (never for pthreads).
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*
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* The following TCB fields must be initialized:
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*
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* - adj_stack_size: Stack size after adjustment for hardware,
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* processor, etc. This value is retained only for debug
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* purposes.
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* - stack_alloc_ptr: Pointer to allocated stack
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* - adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The
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* initial value of the stack pointer.
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*
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* Inputs:
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* - tcb: The TCB of new task
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* - stack_size: The allocated stack size.
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*
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* NOTE: Unlike up_stack_create() and up_stack_release, this function
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* does not require the task type (ttype) parameter. The TCB flags will
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* always be set to provide the task type to up_use_stack() if it needs
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* that information.
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*
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****************************************************************************/
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int up_use_stack(struct tcb_s *tcb, void *stack, size_t stack_size)
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{
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size_t top_of_stack;
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size_t size_of_stack;
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/* Is there already a stack allocated? */
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if (tcb->stack_alloc_ptr)
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{
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/* Yes.. Release the old stack allocation */
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up_release_stack(tcb, tcb->flags & TCB_FLAG_TTYPE_MASK);
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}
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/* Save the new stack allocation */
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tcb->stack_alloc_ptr = stack;
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/* XTENSA uses a push-down stack: the stack grows toward loweraddresses in
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* memory. The stack pointer register, points to the lowest, valid work
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* address (the "top" of the stack). Items on the stack are referenced
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* as positive word offsets from sp.
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*/
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top_of_stack = (uint32_t)tcb->stack_alloc_ptr + stack_size - 4;
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/* The XTENSA stack must be aligned at word (4 byte) or double word (8 byte)
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* boundaries. If necessary top_of_stack must be rounded down to the
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* next boundary
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*/
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top_of_stack = STACK_ALIGN_DOWN(top_of_stack);
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size_of_stack = top_of_stack - (uint32_t)tcb->stack_alloc_ptr + 4;
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/* Save the adjusted stack values in the struct tcb_s */
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tcb->adj_stack_ptr = (uint32_t *)top_of_stack;
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tcb->adj_stack_size = size_of_stack;
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return OK;
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}
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