sparc: Unify strlen assembler.

Use the new asm/asm.h header to help commonize the
strlen assembler between 32-bit and 64-bit

While we're here, use proper linux/linkage.h macros
instead of by-hand stuff.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/lib/strlen.S

@@ -0,0 +1,80 @@
+/* strlen.S: Sparc optimized strlen code
+ * Hand optimized from GNU libc's strlen
+ * Copyright (C) 1991,1996 Free Software Foundation
+ * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+	.text
+ENTRY(strlen)
+	mov	%o0, %o1
+	andcc	%o0, 3, %g0
+	BRANCH32(be, pt, 9f)
+	 sethi	%hi(HI_MAGIC), %o4
+	ldub	[%o0], %o5
+	BRANCH_REG_ZERO(pn, %o5, 11f)
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	BRANCH32(be, pn, 4f)
+	 or	%o4, %lo(HI_MAGIC), %o3
+	ldub	[%o0], %o5
+	BRANCH_REG_ZERO(pn, %o5, 12f)
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	BRANCH32(be, pt, 5f)
+	 sethi	%hi(LO_MAGIC), %o4
+	ldub	[%o0], %o5
+	BRANCH_REG_ZERO(pn, %o5, 13f)
+	 add	%o0, 1, %o0
+	BRANCH32(ba, pt, 8f)
+	 or	%o4, %lo(LO_MAGIC), %o2
+9:
+	or	%o4, %lo(HI_MAGIC), %o3
+4:
+	sethi	%hi(LO_MAGIC), %o4
+5:
+	or	%o4, %lo(LO_MAGIC), %o2
+8:
+	ld	[%o0], %o5
+2:
+	sub	%o5, %o2, %o4
+	andcc	%o4, %o3, %g0
+	BRANCH32(be, pt, 8b)
+	 add	%o0, 4, %o0
+
+	/* Check every byte. */
+	srl	%o5, 24, %g7
+	andcc	%g7, 0xff, %g0
+	BRANCH32(be, pn, 1f)
+	 add	%o0, -4, %o4
+	srl	%o5, 16, %g7
+	andcc	%g7, 0xff, %g0
+	BRANCH32(be, pn, 1f)
+	 add	%o4, 1, %o4
+	srl	%o5, 8, %g7
+	andcc	%g7, 0xff, %g0
+	BRANCH32(be, pn, 1f)
+	 add	%o4, 1, %o4
+	andcc	%o5, 0xff, %g0
+	BRANCH32_ANNUL(bne, pt, 2b)
+	 ld	[%o0], %o5
+	add	%o4, 1, %o4
+1:
+	retl
+	 sub	%o4, %o1, %o0
+11:
+	retl
+	 mov	0, %o0
+12:
+	retl
+	 mov	1, %o0
+13:
+	retl
+	 mov	2, %o0
+ENDPROC(strlen)