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 000000000000..8c8a371df3c9
--- /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