c1f24ac99f
__raw_readsb() should always use byte accesses, never halfword accesses, to I/O memory. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
49 lines
760 B
ArmAsm
49 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
|