microblaze_mmu_v2: uaccess MMU update

[pandora-kernel.git] / arch / microblaze / lib / uaccess_old.S

diff --git a/arch/microblaze/lib/uaccess_old.S b/arch/microblaze/lib/uaccess_old.S
new file mode 100644 (file)
index 0000000..67f991c
--- /dev/null
+++ b/arch/microblaze/lib/uaccess_old.S
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2009 PetaLogix
+ * Copyright (C) 2007 LynuxWorks, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/errno.h>
+#include <linux/linkage.h>
+
+/*
+ * int __strncpy_user(char *to, char *from, int len);
+ *
+ * Returns:
+ *  -EFAULT  for an exception
+ *  len      if we hit the buffer limit
+ *  bytes copied
+ */
+
+       .text
+.globl __strncpy_user;
+.align 4;
+__strncpy_user:
+
+       /*
+        * r5 - to
+        * r6 - from
+        * r7 - len
+        * r3 - temp count
+        * r4 - temp val
+        */
+       addik   r3,r7,0         /* temp_count = len */
+       beqi    r3,3f
+1:
+       lbu     r4,r6,r0
+       sb      r4,r5,r0
+
+       addik   r3,r3,-1
+       beqi    r3,2f           /* break on len */
+
+       addik   r5,r5,1
+       bneid   r4,1b
+       addik   r6,r6,1         /* delay slot */
+       addik   r3,r3,1         /* undo "temp_count--" */
+2:
+       rsubk   r3,r3,r7        /* temp_count = len - temp_count */
+3:
+       rtsd    r15,8
+       nop
+
+
+       .section        .fixup, "ax"
+       .align  2
+4:
+       brid    3b
+       addik   r3,r0, -EFAULT
+
+       .section        __ex_table, "a"
+       .word   1b,4b
+
+/*
+ * int __strnlen_user(char __user *str, int maxlen);
+ *
+ * Returns:
+ *  0 on error
+ *  maxlen + 1  if no NUL byte found within maxlen bytes
+ *  size of the string (including NUL byte)
+ */
+
+       .text
+.globl __strnlen_user;
+.align 4;
+__strnlen_user:
+       addik   r3,r6,0
+       beqi    r3,3f
+1:
+       lbu     r4,r5,r0
+       beqid   r4,2f           /* break on NUL */
+       addik   r3,r3,-1        /* delay slot */
+
+       bneid   r3,1b
+       addik   r5,r5,1         /* delay slot */
+
+       addik   r3,r3,-1        /* for break on len */
+2:
+       rsubk   r3,r3,r6
+3:
+       rtsd    r15,8
+       nop
+
+
+       .section        .fixup,"ax"
+4:
+       brid    3b
+       addk    r3,r0,r0
+
+       .section        __ex_table,"a"
+       .word   1b,4b
+
+/*
+ * int __copy_tofrom_user(char *to, char *from, int len)
+ * Return:
+ *   0 on success
+ *   number of not copied bytes on error
+ */
+       .text
+.globl __copy_tofrom_user;
+.align 4;
+__copy_tofrom_user:
+       /*
+        * r5 - to
+        * r6 - from
+        * r7, r3 - count
+        * r4 - tempval
+        */
+       addik   r3,r7,0
+       beqi    r3,3f
+1:
+       lbu     r4,r6,r0
+       addik   r6,r6,1
+2:
+       sb      r4,r5,r0
+       addik   r3,r3,-1
+       bneid   r3,1b
+       addik   r5,r5,1         /* delay slot */
+3:
+       rtsd    r15,8
+       nop
+
+
+       .section        __ex_table,"a"
+       .word   1b,3b,2b,3b