1 files changed, 95 insertions, 0 deletions

diff --git a/arch/sparc64/lib/strlen_user.S b/arch/sparc64/lib/strlen_user.S
new file mode 100644
index 000000000000..9ed54ba14fc6
--- /dev/null
+++ b/arch/sparc64/lib/strlen_user.S
@@ -0,0 +1,95 @@
+/* strlen_user.S: Sparc64 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) 1996,1999 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <asm/asi.h>
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+        .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
+        be,pt   %icc, 9f
+         sethi  %hi(HI_MAGIC), %o4
+10:     lduba   [%o0] %asi, %o5
+        brz,pn  %o5, 21f
+         add    %o0, 1, %o0
+        andcc   %o0, 3, %g0
+        be,pn   %icc, 4f
+         or     %o4, %lo(HI_MAGIC), %o3
+11:     lduba   [%o0] %asi, %o5
+        brz,pn  %o5, 22f
+         add    %o0, 1, %o0
+        andcc   %o0, 3, %g0
+        be,pt   %icc, 13f
+         srl    %o3, 7, %o2
+12:     lduba   [%o0] %asi, %o5
+        brz,pn  %o5, 23f
+         add    %o0, 1, %o0
+        ba,pt   %icc, 2f
+15:      lda    [%o0] %asi, %o5
+9:      or      %o4, %lo(HI_MAGIC), %o3
+4:      srl     %o3, 7, %o2
+13:     lda     [%o0] %asi, %o5
+2:      sub     %o5, %o2, %o4
+        andcc   %o4, %o3, %g0
+        bne,pn  %icc, 82f
+         add    %o0, 4, %o0
+        sub     %o0, %o1, %g2
+81:     cmp     %g2, %g1
+        blu,pt  %icc, 13b
+         mov    %o0, %o4
+        ba,a,pt %xcc, 1f
+
+        /* Check every byte. */
+82:     srl     %o5, 24, %g7
+        andcc   %g7, 0xff, %g0
+        be,pn   %icc, 1f
+         add    %o0, -3, %o4
+        srl     %o5, 16, %g7
+        andcc   %g7, 0xff, %g0
+        be,pn   %icc, 1f
+         add    %o4, 1, %o4
+        srl     %o5, 8, %g7
+        andcc   %g7, 0xff, %g0
+        be,pn   %icc, 1f
+         add    %o4, 1, %o4
+        andcc   %o5, 0xff, %g0
+        bne,pt  %icc, 81b
+         sub    %o0, %o1, %g2
+        add     %o4, 1, %o4
+1:      retl
+         sub    %o4, %o1, %o0
+21:     retl
+         mov    1, %o0
+22:     retl
+         mov    2, %o0
+23:     retl
+         mov    3, %o0
+
+        .section .fixup,#alloc,#execinstr
+        .align  4
+30:
+        retl
+         clr    %o0
+
+        .section __ex_table,#alloc
+        .align  4
+
+        .word   10b, 30b
+        .word   11b, 30b
+        .word   12b, 30b
+        .word   15b, 30b
+        .word   13b, 30b