c85fcaecdb
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5739 42af7a65-404d-4744-a932-0658087f49c3
158 lines
5.1 KiB
ArmAsm
158 lines
5.1 KiB
ArmAsm
/****************************************************************************
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* arch/avr32/src/avr32/up_nommuhead.S
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*
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* Copyright (C) 2010 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/avr32/avr32.h>
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#include "up_internal.h"
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#include "up_arch.h"
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/****************************************************************************
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* External Symbols
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****************************************************************************/
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.file "up_nommuhead.S"
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.global _sbss /* Start of .bss. Defined by ld.script */
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.global _ebss /* End of .bss. Defined by ld.script */
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#ifdef CONFIG_BOOT_RUNFROMFLASH
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.global _sdata /* Start of .data section in RAM */
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.global _edata /* End of .data section in RAM */
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.global _eronly /* Start of .data section in FLASH */
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#endif
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.global up_lowinit /* Perform low level initialization */
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.global os_start /* NuttX entry point */
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.global vectortab /* Vector base address */
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/****************************************************************************
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* Macros
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****************************************************************************/
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/****************************************************************************
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* OS Entry Point
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****************************************************************************/
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/* The following entry point must be linked to execute at 0x80000000 if it
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* is to execute upon reset.
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*/
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.text
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.global __start
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.type __start, @function
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__start:
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/* Set the IDLE thread stack pointer. This stack will be used
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* through NuttX initialization and will, eventually, be inherited
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* by the IDLE thread when threading is enabled.
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*/
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lddpc sp, .Lstackbase
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/* Set up the vector base address so interrupts can be enabled. */
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lda.w r0, vectortab
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mtsr AVR32_EVBA, r0
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/* Enable exception processing */
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csrf AVR32_SR_EM_SHIFT
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/* Clear system BSS section */
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lda.w r0, _sbss /* R =Start of .bss */
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lda.w r1, _ebss /* r1=End of .bss */
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mov r2, 0 /* Value to write to .bss */
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rjmp 2f /* Start at the bottom of the loop */
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1:
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st.d r0++, r2 /* Zero .bss */
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2:
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cp r0, r1 /* Finished? */
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brlo 1b /* No... keep looping */
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/* Copy system .data sections to new home in RAM. */
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#ifdef CONFIG_BOOT_RUNFROMFLASH
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lda.w r0, _sdata /* r0=Start of .data section in RAM */
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lda.w r1, _edata /* r1=End of .data section in RAM */
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lda.w r2, _eronly /* r2=Start of .data in FLASH */
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rjmp 4f /* Start at the bottom of the loop */
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3:
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ld.d r4, r2++ /* Fetch the next data value */
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st.d r0++, r4 /* Write it to the .data section */
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4:
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cp r0, r1 /* Finished? */
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brlo 3b /* No... keep looping */
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#endif
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/* Clear the frame pointer and link register since this is the outermost
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* frame.
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*/
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mov r7, 0
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mov lr, 0
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/* Perform low-level initialization */
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mcall .Lup_lowinit
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/* Then jump to OS entry (will not return) */
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lda.w pc, os_start
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.Lstackbase:
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.word _ebss+CONFIG_IDLETHREAD_STACKSIZE-4
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.Lup_lowinit:
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.word up_lowinit
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.size __start, .-__start
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/* This global variable is unsigned long g_idle_topstack and is
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* exported from here only because of its coupling to other
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* uses of _ebss in this file
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*/
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.data
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.align 4
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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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.long _ebss+CONFIG_IDLETHREAD_STACKSIZE
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.size g_idle_topstack, .-g_idle_topstack
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.end
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