72 lines
2.8 KiB
ArmAsm
72 lines
2.8 KiB
ArmAsm
/* Copyright (c) 2012-2015 Red Hat Incorporated.
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All rights reserved.
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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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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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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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The name of Red Hat Incorporated may not be used to endorse
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or promote products derived from this software without specific
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prior written permission.
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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 for
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a particular purpose are disclaimed. In no event shall Red Hat
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incorporated be liable for any direct, indirect, incidental, special,
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exemplary, or consequential damages (including, but not limited to,
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procurement of substitute goods or services; loss of use, data, or
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profits; or business interruption) however caused and on any theory of
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liability, whether in contract, strict liability, or tort (including
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negligence or otherwise) arising in any way out of the use of this
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software, even if advised of the possibility of such damage. */
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#ifdef __MSP430X_LARGE__
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#include "memmodel.h"
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;; This function is responsible for making sure that the
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;; contents of the .upper.data section have their correct startup values.
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;; If a copy of the .upper.data section is stored in ROM then this means
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;; copying the contents into HIFRAM. If a copy of .upper.data is stored in a
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;; shadow section in HIFRAM then this means copying from the shadow section
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;; into the real section.
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START_CRT_FUNC 0400 move_highdata
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;; __rom_highdatacopysize may be zero. Test this first because
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;; its value may come from the weak definitions above and we do
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;; not want to access the memory at address 0 pointed to by the
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;; weak definition of __upper_data_init.
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mov.w #__rom_highdatacopysize, R14
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cmp.w #0, R14
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jeq 3f
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/* Test our status word. */
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cmpx.w #0, &__upper_data_init
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jeq 1f
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/* Status word is non-zero - copy from shadow into upper. */
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mov_ #__high_datastart, R12
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mov_ #__rom_highdatastart, R13
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jmp 2f
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1: /* Status word is zero. Copy from upper to shadow and change status word. */
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movx.w #1, &__upper_data_init
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mov_ #__rom_highdatastart, R12
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mov_ #__high_datastart, R13
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2: ;; __rom_highdatacopysize may be zero. memmove should cope.
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mov.w #__rom_highdatacopysize, R14
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call_ #memmove
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3:
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END_CRT_FUNC move_highdata
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#endif /* __MSP430X_LARGE__ */
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