1 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/lib/getuser.S b/arch/arm/lib/getuser.S
new file mode 100644
index 00000000..11093a7c
--- /dev/null
+++ b/arch/arm/lib/getuser.S
@@ -0,0 +1,73 @@
+/*
+ *  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 <asm/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 <linux/linkage.h>
+#include <asm/errno.h>
+#include <asm/domain.h>
+
+ENTRY(__get_user_1)
+1: TUSER(ldrb)	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__get_user_1)
+
+ENTRY(__get_user_2)
+#ifdef CONFIG_THUMB2_KERNEL
+2: TUSER(ldrb)	r2, [r0]
+3: TUSER(ldrb)	r3, [r0, #1]
+#else
+2: TUSER(ldrb)	r2, [r0], #1
+3: TUSER(ldrb)	r3, [r0]
+#endif
+#ifndef __ARMEB__
+	orr	r2, r2, r3, lsl #8
+#else
+	orr	r2, r3, r2, lsl #8
+#endif
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__get_user_2)
+
+ENTRY(__get_user_4)
+4: TUSER(ldr)	r2, [r0]
+	mov	r0, #0
+	mov	pc, lr
+ENDPROC(__get_user_4)
+
+__get_user_bad:
+	mov	r2, #0
+	mov	r0, #-EFAULT
+	mov	pc, lr
+ENDPROC(__get_user_bad)
+
+.pushsection __ex_table, "a"
+	.long	1b, __get_user_bad
+	.long	2b, __get_user_bad
+	.long	3b, __get_user_bad
+	.long	4b, __get_user_bad
+.popsection