117 lines
5.0 KiB
ArmAsm
117 lines
5.0 KiB
ArmAsm
/************************************************************************************
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* arch/arm/src/efm32/efm32_vectors.S
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*
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* Copyright (C) 2014 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 <arch/irq.h>
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#include "chip.h"
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#include "exc_return.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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#ifdef CONFIG_ARCH_HIPRI_INTERRUPT
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/* In kernel mode without an interrupt stack, this interrupt handler will set the
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* MSP to the stack pointer of the interrupted thread. If the interrupted thread
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* was a privileged thread, that will be the MSP otherwise it will be the PSP. If
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* the PSP is used, then the value of the MSP will be invalid when the interrupt
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* handler returns because it will be a pointer to an old position in the
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* unprivileged stack. Then when the high priority interrupt occurs and uses this
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* stale MSP, there will most likely be a system failure.
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*
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* If the interrupt stack is selected, on the other hand, then the interrupt
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* handler will always set the the MSP to the interrupt stack. So when the high
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* priority interrupt occurs, it will either use the MSP of the last privileged
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* thread to run or, in the case of the nested interrupt, the interrupt stack if
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* no privileged task has run.
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*/
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# if defined(CONFIG_NUTTX_KERNEL) && CONFIG_ARCH_INTERRUPTSTACK < 4
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# error Interrupt stack must be used with high priority interrupts in kernel mode
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# endif
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/* Use the the BASEPRI to control interrupts is required if nested, high
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* priority interrupts are supported.
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*/
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# ifndef CONFIG_ARMV7M_USEBASEPRI
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# error CONFIG_ARMV7M_USEBASEPRI must be used with CONFIG_ARCH_HIPRI_INTERRUPT
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# endif
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#endif
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#define IDLE_STACK (_ebss+CONFIG_IDLETHREAD_STACKSIZE-4)
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#define HEAP_BASE (_ebss+CONFIG_IDLETHREAD_STACKSIZE)
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/************************************************************************************
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* Public Symbols
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************************************************************************************/
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.syntax unified
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.thumb
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.file "efm32_vectors.S"
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/* The EFM32 chips all use the common ARMv7 interrupt vectoring.
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* (see arch/arm/src/armv7-m/up_vectors.S)
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*/
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/************************************************************************************
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* .rodata
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************************************************************************************/
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.section .rodata, "a"
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/* Variables: _sbss is the start of the BSS region (see ld.script) _ebss is the end
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* of the BSS regsion (see ld.script). The idle task stack starts at the end of BSS
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* and is of size CONFIG_IDLETHREAD_STACKSIZE. The IDLE thread is the thread that
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* the system boots on and, eventually, becomes the idle, do nothing task that runs
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* only when there is nothing else to run. The heap continues from there until the
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* end of memory. See g_idle_topstack below.
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*/
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.globl g_idle_topstack
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.type g_idle_topstack, object
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g_idle_topstack:
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.word HEAP_BASE
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.size g_idle_topstack, .-g_idle_topstack
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.end
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