This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / avr32 / lib / strnlen_user.S

diff --git a/arch/avr32/lib/strnlen_user.S b/arch/avr32/lib/strnlen_user.S
new file mode 100644 (file)
index 0000000..65ce11a
--- /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