1 files changed, 76 insertions, 0 deletions
diff --git a/arch/arm/lib/putuser.S b/arch/arm/lib/putuser.S
new file mode 100644
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+/*
+ *  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 include/asm-arm/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 <asm/constants.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+
+	.global	__put_user_1
+__put_user_1:
+1:	strbt	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__put_user_2
+__put_user_2:
+	mov	ip, r2, lsr #8
+#ifndef __ARMEB__
+2:	strbt	r2, [r0], #1
+3:	strbt	ip, [r0]
+#else
+2:	strbt	ip, [r0], #1
+3:	strbt	r2, [r0]
+#endif
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__put_user_4
+__put_user_4:
+4:	strt	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__put_user_8
+__put_user_8:
+5:	strt	r2, [r0], #4
+6:	strt	r3, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+__put_user_bad:
+	mov	r0, #-EFAULT
+	mov	pc, lr
+
+.section __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
+.previous