1 files changed, 67 insertions, 0 deletions

diff --git a/arch/avr32/lib/strnlen_user.S b/arch/avr32/lib/strnlen_user.S
new file mode 100644
index 000000000000..65ce11afa66a
--- /dev/null
+++ b/arch/avr32/lib/strnlen_user.S
@@ -0,0 +1,67 @@
+/*
+ * Copy to/from userspace with optional address space checking.
+ *
+ * Copyright 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/processor.h>
+#include <asm/asm.h>
+
+        .text
+        .align  1
+        .global strnlen_user
+        .type   strnlen_user, "function"
+strnlen_user:
+        branch_if_kernel r8, __strnlen_user
+        sub     r8, r11, 1
+        add     r8, r12
+        retcs   0
+        brmi    adjust_length   /* do a closer inspection */
+
+        .global __strnlen_user
+        .type   __strnlen_user, "function"
+__strnlen_user:
+        mov     r10, r12
+
+10:     ld.ub   r8, r12++
+        cp.w    r8, 0
+        breq    2f
+        sub     r11, 1
+        brne    10b
+
+        sub     r12, -1
+2:      sub     r12, r10
+        retal   r12
+
+
+        .type   adjust_length, "function"
+adjust_length:
+        cp.w    r12, 0          /* addr must always be < TASK_SIZE */
+        retmi   0
+
+        pushm   lr
+        lddpc   lr, _task_size
+        sub     r11, lr, r12
+        mov     r9, r11
+        rcall   __strnlen_user
+        cp.w    r12, r9
+        brgt    1f
+        popm    pc
+1:      popm    pc, r12=0
+
+        .align  2
+_task_size:
+        .long   TASK_SIZE
+
+        .section .fixup, "ax"
+        .align  1
+19:     retal   0
+
+        .section __ex_table, "a"
+        .align  2
+        .long   10b, 19b