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>

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 000000000000..cbc0d912e5f3
--- /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