1 files changed, 47 insertions, 0 deletions

diff --git a/arch/avr32/lib/io-readsb.S b/arch/avr32/lib/io-readsb.S
new file mode 100644
index 000000000000..b319d5e71749
--- /dev/null
+++ b/arch/avr32/lib/io-readsb.S
@@ -0,0 +1,47 @@
+/*
+ * 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.uh   r8, r12[0]
+        sub     r10, 1
+        st.b    r11++, r8
+        brne    3b