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c1f24ac99f
__raw_readsb() should always use byte accesses, never halfword accesses, to I/O memory. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
50 lines
760 B
ArmAsm
50 lines
760 B
ArmAsm
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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.text
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.Lnot_word_aligned:
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1: ld.ub r8, r12[0]
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sub r10, 1
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st.b r11++, r8
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reteq r12
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tst r11, r9
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brne 1b
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/* fall through */
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.global __raw_readsb
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.type __raw_readsb,@function
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__raw_readsb:
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cp.w r10, 0
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mov r9, 3
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reteq r12
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tst r11, r9
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brne .Lnot_word_aligned
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sub r10, 4
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brlt 2f
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1: ldins.b r8:t, r12[0]
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ldins.b r8:u, r12[0]
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ldins.b r8:l, r12[0]
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ldins.b r8:b, r12[0]
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st.w r11++, r8
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sub r10, 4
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brge 1b
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2: sub r10, -4
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reteq r12
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3: ld.ub r8, r12[0]
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sub r10, 1
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st.b r11++, r8
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brne 3b
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retal r12
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