diff options
Diffstat (limited to 'kernel/arch/avr32/lib/io-readsb.S')
| -rw-r--r-- | kernel/arch/avr32/lib/io-readsb.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/arch/avr32/lib/io-readsb.S b/kernel/arch/avr32/lib/io-readsb.S new file mode 100644 index 000000000..cb2d86945 --- /dev/null +++ b/kernel/arch/avr32/lib/io-readsb.S @@ -0,0 +1,49 @@ +/* + * 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 |