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-rw-r--r--arch/avr32/lib/io-readsw.S43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/avr32/lib/io-readsw.S b/arch/avr32/lib/io-readsw.S
new file mode 100644
index 0000000..456be99
--- /dev/null
+++ b/arch/avr32/lib/io-readsw.S
@@ -0,0 +1,43 @@
+/*
+ * 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.
+ */
+
+.Lnot_word_aligned:
+ /*
+ * Bad alignment will cause a hardware exception, which is as
+ * good as anything. No need for us to check for proper alignment.
+ */
+ ld.uh r8, r12[0]
+ sub r10, 1
+ st.h r11++, r8
+
+ /* fall through */
+
+ .global __raw_readsw
+ .type __raw_readsw,@function
+__raw_readsw:
+ cp.w r10, 0
+ reteq r12
+ mov r9, 3
+ tst r11, r9
+ brne .Lnot_word_aligned
+
+ sub r10, 2
+ brlt 2f
+
+1: ldins.h r8:t, r12[0]
+ ldins.h r8:b, r12[0]
+ st.w r11++, r8
+ sub r10, 2
+ brge 1b
+
+2: sub r10, -2
+ reteq r12
+
+ ld.uh r8, r12[0]
+ st.h r11++, r8
+ retal r12
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