a541ac3c46
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@553 42af7a65-404d-4744-a932-0658087f49c3
119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/************************************************************
|
|
* common/up_usestack.c
|
|
*
|
|
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Included Files
|
|
************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <sys/types.h>
|
|
#include <sched.h>
|
|
#include <debug.h>
|
|
#include <nuttx/kmalloc.h>
|
|
#include <nuttx/arch.h>
|
|
#include "up_internal.h"
|
|
|
|
/************************************************************
|
|
* Private Types
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Private Function Prototypes
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Global Functions
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Name: up_use_stack
|
|
*
|
|
* Description:
|
|
* Setup up stack-related information in the TCB
|
|
* using pre-allocated stack memory
|
|
*
|
|
* The following TCB fields must be initialized:
|
|
* adj_stack_size: Stack size after adjustment for hardware,
|
|
* processor, etc. This value is retained only for debug
|
|
* purposes.
|
|
* stack_alloc_ptr: Pointer to allocated stack
|
|
* adj_stack_ptr: Adjusted stack_alloc_ptr for HW. The
|
|
* initial value of the stack pointer.
|
|
*
|
|
* Inputs:
|
|
* tcb: The TCB of new task
|
|
* stack_size: The allocated stack size.
|
|
*
|
|
************************************************************/
|
|
|
|
STATUS up_use_stack(_TCB *tcb, void *stack, size_t stack_size)
|
|
{
|
|
size_t top_of_stack;
|
|
size_t size_of_stack;
|
|
|
|
if (tcb->stack_alloc_ptr)
|
|
{
|
|
sched_free(tcb->stack_alloc_ptr);
|
|
}
|
|
|
|
/* Save the stack allocation */
|
|
|
|
tcb->stack_alloc_ptr = stack;
|
|
|
|
/* The Arm7Tdmi uses a push-down stack: the stack grows
|
|
* toward loweraddresses in memory. The stack pointer
|
|
* register, points to the lowest, valid work address
|
|
* (the "top" of the stack). Items on the stack are
|
|
* referenced as positive word offsets from sp.
|
|
*/
|
|
|
|
top_of_stack = (uint32)tcb->stack_alloc_ptr + stack_size - 4;
|
|
|
|
/* The Arm7Tdmi stack must be aligned at word (4 byte)
|
|
* boundaries. If necessary top_of_stack must be rounded
|
|
* down to the next boundary
|
|
*/
|
|
|
|
top_of_stack &= ~3;
|
|
size_of_stack = top_of_stack - (uint32)tcb->stack_alloc_ptr + 4;
|
|
|
|
/* Save the adjusted stack values in the _TCB */
|
|
|
|
tcb->adj_stack_size = top_of_stack;
|
|
tcb->adj_stack_size = size_of_stack;
|
|
|
|
return OK;
|
|
}
|