d4674ed3b7
Implement functions to read from a memory location and indicate failure in case this is not possible. Since we do not have a MMU, intercept the data abort handler and simply return when the abort comes from the safe read routines. Change-Id: I08f2e59898dcac893319a8150d4cf626f3adabbd Reviewed-on: http://gerrit.rockbox.org/207 Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
33 lines
No EOL
1.3 KiB
C
33 lines
No EOL
1.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __SAFE_READ__
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#define __SAFE_READ__
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#include "system.h"
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/* Try to read an X-bit unsigned integer. If the address is not readable,
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* returns false. Otherwise returns true and store the result in *value
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* if value is not NULL */
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bool safe_read8(uint8_t *addr, uint8_t *value);
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bool safe_read16(uint16_t *addr, uint16_t *value);
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bool safe_read32(uint32_t *addr, uint32_t *value);
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#endif /* __SAFE_READ__ */ |