kernel-ark/arch/avr32/lib/io-readsb.S
Haavard Skinnemoen c1f24ac99f avr32: Fix wrong I/O access size in __raw_readsb
__raw_readsb() should always use byte accesses, never halfword accesses,
to I/O memory.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-06-27 15:07:50 +02:00

50 lines
760 B
ArmAsm

/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
.text
.Lnot_word_aligned:
1: ld.ub r8, r12[0]
sub r10, 1
st.b r11++, r8
reteq r12
tst r11, r9
brne 1b
/* fall through */
.global __raw_readsb
.type __raw_readsb,@function
__raw_readsb:
cp.w r10, 0
mov r9, 3
reteq r12
tst r11, r9
brne .Lnot_word_aligned
sub r10, 4
brlt 2f
1: ldins.b r8:t, r12[0]
ldins.b r8:u, r12[0]
ldins.b r8:l, r12[0]
ldins.b r8:b, r12[0]
st.w r11++, r8
sub r10, 4
brge 1b
2: sub r10, -4
reteq r12
3: ld.ub r8, r12[0]
sub r10, 1
st.b r11++, r8
brne 3b
retal r12