1 files changed, 78 insertions, 0 deletions
diff --git a/arch/arm/lib/getuser.S b/arch/arm/lib/getuser.S
new file mode 100644
index 000000000000..64aa6f4fe5e4
--- /dev/null
+++ b/arch/arm/lib/getuser.S
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+/*
+ *  linux/arch/arm/lib/getuser.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.
+ *
+ * __get_user_X
+ *
+ * Inputs:	r0 contains the address
+ * Outputs:	r0 is the error code
+ *		r2, r3 contains the zero-extended value
+ *		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 __get_user_bad is not global.
+ */
+#include <asm/constants.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+
+	.global	__get_user_1
+__get_user_1:
+1:	ldrbt	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__get_user_2
+__get_user_2:
+2:	ldrbt	r2, [r0], #1
+3:	ldrbt	r3, [r0]
+#ifndef __ARMEB__
+	orr	r2, r2, r3, lsl #8
+#else
+	orr	r2, r3, r2, lsl #8
+#endif
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__get_user_4
+__get_user_4:
+4:	ldrt	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+	.global	__get_user_8
+__get_user_8:
+5:	ldrt	r2, [r0], #4
+6:	ldrt	r3, [r0]
+	mov	r0, #0
+	mov	pc, lr
+
+__get_user_bad_8:
+	mov	r3, #0
+__get_user_bad:
+	mov	r2, #0
+	mov	r0, #-EFAULT
+	mov	pc, lr
+
+.section __ex_table, "a"
+	.long	1b, __get_user_bad
+	.long	2b, __get_user_bad
+	.long	3b, __get_user_bad
+	.long	4b, __get_user_bad
+	.long	5b, __get_user_bad_8
+	.long	6b, __get_user_bad_8
+.previous