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authorPaul Mundt <lethal@linux-sh.org>2008-12-12 16:34:44 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:44:05 +0900
commit4466b20cfcfa718ff515b9e3886749cc025e2005 (patch)
treef12402e006de74df252dff03d455af0a9e2bfa0b /arch/sh/lib64/strlen.S
parent776d6c298aad42c2b8f191fa9ad826075e4d588c (diff)
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sh: Add SH-5 optimized memcpy()/memset()/strcpy()/strlen().
Adopted from the uClibc optimized string versions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/lib64/strlen.S')
-rw-r--r--arch/sh/lib64/strlen.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sh/lib64/strlen.S b/arch/sh/lib64/strlen.S
new file mode 100644
index 0000000..cbc0d91
--- /dev/null
+++ b/arch/sh/lib64/strlen.S
@@ -0,0 +1,33 @@
+/*
+ * Simplistic strlen() implementation for SHmedia.
+ *
+ * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
+ */
+
+ .section .text..SHmedia32,"ax"
+ .globl strlen
+ .type strlen,@function
+
+ .balign 16
+strlen:
+ ptabs r18, tr4
+
+ /*
+ * Note: We could easily deal with the NULL case here with a simple
+ * sanity check, though it seems that the behavior we want is to fault
+ * in the event that r2 == NULL, so we don't bother.
+ */
+/* beqi r2, 0, tr4 */ ! Sanity check
+
+ movi -1, r0
+ pta/l loop, tr0
+loop:
+ ld.b r2, 0, r1
+ addi r2, 1, r2
+ addi r0, 1, r0
+ bnei/l r1, 0, tr0
+
+ or r0, r63, r2
+ blink tr4, r63
+
+ .size strlen,.-strlen