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

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

diff --git a/arch/avr32/lib/clear_user.S b/arch/avr32/lib/clear_user.S
new file mode 100644 (file)
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+++ b/arch/avr32/lib/clear_user.S
@@ -0,0 +1,76 @@
+/*
+ * 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/asm.h>
+
+       .text
+       .align  1
+       .global clear_user
+       .type   clear_user, "function"
+clear_user:
+       branch_if_kernel r8, __clear_user
+       ret_if_privileged r8, r12, r11, r11
+
+       .global __clear_user
+       .type   __clear_user, "function"
+__clear_user:
+       mov     r9, r12
+       mov     r8, 0
+       andl    r9, 3, COH
+       brne    5f
+
+1:     sub     r11, 4
+       brlt    2f
+
+10:    st.w    r12++, r8
+       sub     r11, 4
+       brge    10b
+
+2:     sub     r11, -4
+       reteq   0
+
+       /* Unaligned count or address */
+       bld     r11, 1
+       brcc    12f
+11:    st.h    r12++, r8
+       sub     r11, 2
+       reteq   0
+12:    st.b    r12++, r8
+       retal   0
+
+       /* Unaligned address */
+5:     cp.w    r11, 4
+       brlt    2b
+
+       lsl     r9, 2
+       add     pc, pc, r9
+13:    st.b    r12++, r8
+       sub     r11, 1
+14:    st.b    r12++, r8
+       sub     r11, 1
+15:    st.b    r12++, r8
+       sub     r11, 1
+       rjmp    1b
+
+       .size   clear_user, . - clear_user
+       .size   __clear_user, . - __clear_user
+
+       .section .fixup, "ax"
+       .align  1
+18:    sub     r11, -4
+19:    retal   r11
+
+       .section __ex_table, "a"
+       .align  2
+       .long   10b, 18b
+       .long   11b, 19b
+       .long   12b, 19b
+       .long   13b, 19b
+       .long   14b, 19b
+       .long   15b, 19b