From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/lib/putuser.S | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 arch/arm/lib/putuser.S

(limited to 'arch/arm/lib/putuser.S')

diff --git a/arch/arm/lib/putuser.S b/arch/arm/lib/putuser.S
new file mode 100644
index 00000000..7db25990
--- /dev/null
+++ b/arch/arm/lib/putuser.S
@@ -0,0 +1,92 @@
+/*
+ *  linux/arch/arm/lib/putuser.S
+ *
+ *  Copyright (C) 2001 Russell King
+ *
+ * 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.
+ *
+ *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
+ *
+ * These functions have a non-standard call interface to make
+ * them more efficient, especially as they return an error
+ * value in addition to the "real" return value.
+ *
+ * __put_user_X
+ *
+ * Inputs:	r0 contains the address
+ *		r2, r3 contains the value
+ * Outputs:	r0 is the error code
+ *		lr corrupted
+ *
+ * No other registers must be altered.  (see <asm/uaccess.h>
+ * for specific ASM register usage).
+ *
+ * Note that ADDR_LIMIT is either 0 or 0xc0000000
+ * Note also that it is intended that __put_user_bad is not global.
+ */
+#include <linux/linkage.h>
+#include <asm/errno.h>
+#include <asm/domain.h>
+
+ENTRY(__put_user_1)
+1: TUSER(strb)	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__put_user_1)
+
+ENTRY(__put_user_2)
+	mov	ip, r2, lsr #8
+#ifdef CONFIG_THUMB2_KERNEL
+#ifndef __ARMEB__
+2: TUSER(strb)	r2, [r0]
+3: TUSER(strb)	ip, [r0, #1]
+#else
+2: TUSER(strb)	ip, [r0]
+3: TUSER(strb)	r2, [r0, #1]
+#endif
+#else	/* !CONFIG_THUMB2_KERNEL */
+#ifndef __ARMEB__
+2: TUSER(strb)	r2, [r0], #1
+3: TUSER(strb)	ip, [r0]
+#else
+2: TUSER(strb)	ip, [r0], #1
+3: TUSER(strb)	r2, [r0]
+#endif
+#endif	/* CONFIG_THUMB2_KERNEL */
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__put_user_2)
+
+ENTRY(__put_user_4)
+4: TUSER(str)	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__put_user_4)
+
+ENTRY(__put_user_8)
+#ifdef CONFIG_THUMB2_KERNEL
+5: TUSER(str)	r2, [r0]
+6: TUSER(str)	r3, [r0, #4]
+#else
+5: TUSER(str)	r2, [r0], #4
+6: TUSER(str)	r3, [r0]
+#endif
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__put_user_8)
+
+__put_user_bad:
+	mov	r0, #-EFAULT
+	mov	pc, lr
+ENDPROC(__put_user_bad)
+
+.pushsection __ex_table, "a"
+	.long	1b, __put_user_bad
+	.long	2b, __put_user_bad
+	.long	3b, __put_user_bad
+	.long	4b, __put_user_bad
+	.long	5b, __put_user_bad
+	.long	6b, __put_user_bad
+.popsection
-- 
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