c86f502f2e
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5766 42af7a65-404d-4744-a932-0658087f49c3
252 lines
8.7 KiB
C
252 lines
8.7 KiB
C
/****************************************************************************
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* arch/arm/src/common/up_createstack.c
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*
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* Copyright (C) 2007-2013 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 <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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/****************************************************************************
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* Pre-processor Macros
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****************************************************************************/
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/* ARM requires at least a 4-byte stack alignment. For use with EABI and
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* floating point, the stack must be aligned to 8-byte addresses.
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*/
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#ifndef CONFIG_STACK_ALIGNMENT
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/* The symbol __ARM_EABI__ is defined by GCC if EABI is being used. If you
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* are not using GCC, make sure that CONFIG_STACK_ALIGNMENT is set correctly!
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*/
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# ifdef __ARM_EABI__
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# define CONFIG_STACK_ALIGNMENT 8
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# else
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# define CONFIG_STACK_ALIGNMENT 4
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# endif
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#endif
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/* Stack alignment macros */
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#define STACK_ALIGN_MASK (CONFIG_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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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Name: memset32
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*
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* On most larger then 8 bit archs this will need to be word aligned so
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* so maybe some checks should be put in place?
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*
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****************************************************************************/
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#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_STACK)
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static void *memset32(void *s, uint32_t c, size_t n)
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{
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uint32_t *p = (uint32_t *)s;
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while (n-- > 0) *p++ = c;
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return s;
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}
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#endif
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_create_stack
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*
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* Description:
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* Allocate a stack for a new thread and setup up stack-related information
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* in the TCB.
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*
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* The following TCB fields must be initialized by this function:
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*
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* - adj_stack_size: Stack size after adjustment for hardware, processor,
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* etc. This value is retained only for debug 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 initial value of
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* 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 requested stack size. At least this much
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* must be allocated.
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* - ttype: The thread type. This may be one of following (defined in
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* include/nuttx/sched.h):
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*
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* TCB_FLAG_TTYPE_TASK Normal user task
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* TCB_FLAG_TTYPE_PTHREAD User pthread
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* TCB_FLAG_TTYPE_KERNEL Kernel thread
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*
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* This thread type is normally available in the flags field of the TCB,
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* however, there are certain contexts where the TCB may not be fully
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* initialized when up_create_stack is called.
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*
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* If CONFIG_NUTTX_KERNEL is defined, then this thread type may affect
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* how the stack is allocated. For example, kernel thread stacks should
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* be allocated from protected kernel memory. Stacks for user tasks and
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* threads must come from memory that is accessible to user code.
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*
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****************************************************************************/
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int up_create_stack(FAR struct tcb_s *tcb, size_t stack_size, uint8_t ttype)
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{
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/* Is there already a stack allocated of a different size? Because of
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* alignment issues, stack_size might erroneously appear to be of a
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* different size. Fortunately, this is not a critical operation.
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*/
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if (tcb->stack_alloc_ptr && tcb->adj_stack_size != stack_size)
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{
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/* Yes.. Release the old stack */
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up_release_stack(tcb, ttype);
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}
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/* Do we need to allocate a new stack? */
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if (!tcb->stack_alloc_ptr)
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{
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/* Allocate the stack. If DEBUG is enabled (but not stack debug),
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* then create a zeroed stack to make stack dumps easier to trace.
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*/
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#if defined(CONFIG_NUTTX_KERNEL) && defined(CONFIG_MM_KERNEL_HEAP)
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/* Use the kernel allocator if this is a kernel thread */
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if (ttype == TCB_FLAG_TTYPE_KERNEL)
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{
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#if defined(CONFIG_DEBUG) && !defined(CONFIG_DEBUG_STACK)
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tcb->stack_alloc_ptr = (uint32_t *)kzalloc(stack_size);
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#else
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tcb->stack_alloc_ptr = (uint32_t *)kmalloc(stack_size);
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#endif
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}
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else
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#endif
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{
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/* Use the user-space allocator if this is a task or pthread */
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#if defined(CONFIG_DEBUG) && !defined(CONFIG_DEBUG_STACK)
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tcb->stack_alloc_ptr = (uint32_t *)kuzalloc(stack_size);
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#else
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tcb->stack_alloc_ptr = (uint32_t *)kumalloc(stack_size);
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#endif
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}
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#ifdef CONFIG_DEBUG
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/* Was the allocation successful? */
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if (!tcb->stack_alloc_ptr)
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{
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sdbg("ERROR: Failed to allocate stack, size %d\n", stack_size);
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}
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#endif
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}
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/* Did we successfully allocate a stack? */
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if (tcb->stack_alloc_ptr)
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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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/* The ARM uses a push-down stack: the stack grows toward lower
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* addresses in memory. The stack pointer register, points to
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* the lowest, valid work address (the "top" of the stack). Items
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* on the stack are referenced 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 ARM stack must be aligned; 4 byte alignment for OABI and
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* 8-byte alignment for EABI. If necessary top_of_stack must be
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* rounded down to the next boundary
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*/
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top_of_stack = STACK_ALIGN_DOWN(top_of_stack);
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/* The size of the stack in bytes is then the difference between
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* the top and the bottom of the stack (+4 because if the top
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* is the same as the bottom, then the size is one 32-bit element).
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* The size need not be aligned.
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*/
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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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/* If stack debug is enabled, then fill the stack with a
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* recognizable value that we can use later to test for high
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* water marks.
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*/
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#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_STACK)
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memset32(tcb->stack_alloc_ptr, 0xdeadbeef, tcb->adj_stack_size/4);
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#endif
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up_ledon(LED_STACKCREATED);
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return OK;
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}
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return ERROR;
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}
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