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/************************************************************************************
* arch/arm/src/efm32/efm32_vectors.S
*
* Copyright (C) 2009-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <arch/irq.h>
#include "chip.h"
#include "exc_return.h"
/************************************************************************************
* Configuration
************************************************************************************/
/************************************************************************************
* Preprocessor Definitions
************************************************************************************/
/* Configuration ********************************************************************/
#ifdef CONFIG_ARCH_HIPRI_INTERRUPT
/* In kernel mode without an interrupt stack, this interrupt handler will set the
* MSP to the stack pointer of the interrupted thread. If the interrupted thread
* was a privileged thread, that will be the MSP otherwise it will be the PSP. If
* the PSP is used, then the value of the MSP will be invalid when the interrupt
* handler returns because it will be a pointer to an old position in the
* unprivileged stack. Then when the high priority interrupt occurs and uses this
* stale MSP, there will most likely be a system failure.
*
* If the interrupt stack is selected, on the other hand, then the interrupt
* handler will always set the the MSP to the interrupt stack. So when the high
* priority interrupt occurs, it will either use the MSP of the last privileged
* thread to run or, in the case of the nested interrupt, the interrupt stack if
* no privileged task has run.
*/
# if defined(CONFIG_NUTTX_KERNEL) && CONFIG_ARCH_INTERRUPTSTACK < 4
# error Interrupt stack must be used with high priority interrupts in kernel mode
# endif
/* Use the the BASEPRI to control interrupts is required if nested, high
* priority interrupts are supported.
*/
# ifndef CONFIG_ARMV7M_USEBASEPRI
# error CONFIG_ARMV7M_USEBASEPRI must be used with CONFIG_ARCH_HIPRI_INTERRUPT
# endif
#endif
#define IDLE_STACK (_ebss+CONFIG_IDLETHREAD_STACKSIZE-4)
#define HEAP_BASE (_ebss+CONFIG_IDLETHREAD_STACKSIZE)
/************************************************************************************
* Global Symbols
************************************************************************************/
.syntax unified
.thumb
.file "efm32_vectors.S"
/*
* The efm32 chips all use the common ARMv7 interrupt vectoring.
* (see arch/arm/src/armv7-m/up_vectors.S)
*/
/************************************************************************************
* .rodata
************************************************************************************/
.section .rodata, "a"
/* Variables: _sbss is the start of the BSS region (see ld.script) _ebss is the end
* of the BSS regsion (see ld.script). The idle task stack starts at the end of BSS
* and is of size CONFIG_IDLETHREAD_STACKSIZE. The IDLE thread is the thread that
* the system boots on and, eventually, becomes the idle, do nothing task that runs
* only when there is nothing else to run. The heap continues from there until the
* end of memory. See g_idle_topstack below.
*/
.globl g_idle_topstack
.type g_idle_topstack, object
g_idle_topstack:
.word HEAP_BASE
.size g_idle_topstack, .-g_idle_topstack
.end
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