1 files changed, 109 insertions, 0 deletions
diff --git a/arch/sparc/lib/strlen_user.S b/arch/sparc/lib/strlen_user.S
new file mode 100644
index 00000000000..8c8a371df3c
--- /dev/null
+++ b/arch/sparc/lib/strlen_user.S
@@ -0,0 +1,109 @@
+/* strlen_user.S: Sparc optimized strlen_user code
+ *
+ * Return length of string in userspace including terminating 0
+ * or 0 for error
+ *
+ * Copyright (C) 1991,1996 Free Software Foundation
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+10:
+	ldub	[%o0], %o5
+	cmp	%o5, 0
+	be	1f
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	be	4f
+	 or	%o4, %lo(HI_MAGIC), %o3
+11:
+	ldub	[%o0], %o5
+	cmp	%o5, 0
+	be	2f
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	be	5f
+	 sethi	%hi(LO_MAGIC), %o4
+12:
+	ldub	[%o0], %o5
+	cmp	%o5, 0
+	be	3f
+	 add	%o0, 1, %o0
+	b	13f
+	 or	%o4, %lo(LO_MAGIC), %o2
+1:
+	retl
+	 mov	1, %o0
+2:
+	retl
+	 mov	2, %o0
+3:
+	retl
+	 mov	3, %o0
+
+	.align 4
+	.global __strlen_user, __strnlen_user
+__strlen_user:
+	sethi	%hi(32768), %o1
+__strnlen_user:
+	mov	%o1, %g1
+	mov	%o0, %o1
+	andcc	%o0, 3, %g0
+	bne	10b
+	 sethi	%hi(HI_MAGIC), %o4
+	or	%o4, %lo(HI_MAGIC), %o3
+4:
+	sethi	%hi(LO_MAGIC), %o4
+5:
+	or	%o4, %lo(LO_MAGIC), %o2
+13:
+	ld	[%o0], %o5
+2:
+	sub	%o5, %o2, %o4
+	andcc	%o4, %o3, %g0
+	bne	82f
+	 add	%o0, 4, %o0
+	sub	%o0, %o1, %g2
+81:	cmp	%g2, %g1
+	blu	13b
+	 mov	%o0, %o4
+	ba,a	1f
+
+	/* Check every byte. */
+82:	srl	%o5, 24, %g5
+	andcc	%g5, 0xff, %g0
+	be	1f
+	 add	%o0, -3, %o4
+	srl	%o5, 16, %g5
+	andcc	%g5, 0xff, %g0
+	be	1f
+	 add	%o4, 1, %o4
+	srl	%o5, 8, %g5
+	andcc	%g5, 0xff, %g0
+	be	1f
+	 add	%o4, 1, %o4
+	andcc	%o5, 0xff, %g0
+	bne	81b
+	 sub	%o0, %o1, %g2
+
+	add	%o4, 1, %o4
+1:
+	retl
+	 sub	%o4, %o1, %o0
+
+	.section .fixup,#alloc,#execinstr
+	.align	4
+9:
+	retl
+	 clr	%o0
+
+	.section __ex_table,#alloc
+	.align	4
+
+	.word	10b, 9b
+	.word	11b, 9b
+	.word	12b, 9b
+	.word	13b, 9b