1 files changed, 109 insertions, 0 deletions
diff --git a/arch/arm26/lib/putuser.S b/arch/arm26/lib/putuser.S
new file mode 100644
index 000000000000..87588cbe46ae
--- /dev/null
+++ b/arch/arm26/lib/putuser.S
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+/*
+ *  linux/arch/arm26/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
+ *		r1, r2 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/asm_offsets.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+
+        .global __put_user_1
+__put_user_1:
+        bic     r2, sp, #0x1f00
+        bic     r2, r2, #0x00ff
+        str     lr, [sp, #-4]!
+        ldr     r2, [r2, #TI_ADDR_LIMIT]
+        sub     r2, r2, #1
+        cmp     r0, r2
+        bge     __put_user_bad
+1:      cmp     r0, #0x02000000
+        strlsbt r1, [r0]
+        strgeb  r1, [r0]
+        mov     r0, #0
+        ldmfd   sp!, {pc}^
+
+        .global __put_user_2
+__put_user_2:
+        bic     r2, sp, #0x1f00
+        bic     r2, r2, #0x00ff
+        str     lr, [sp, #-4]!
+        ldr     r2, [r2, #TI_ADDR_LIMIT]
+        sub     r2, r2, #2
+        cmp     r0, r2
+        bge     __put_user_bad
+2:      cmp     r0, #0x02000000
+        strlsbt r1, [r0], #1
+        strgeb  r1, [r0], #1
+        mov     r1, r1, lsr #8
+3:      strlsbt r1, [r0]
+        strgeb  r1, [r0]
+        mov     r0, #0
+        ldmfd   sp!, {pc}^
+
+        .global __put_user_4
+__put_user_4:
+        bic     r2, sp, #0x1f00
+        bic     r2, r2, #0x00ff
+        str     lr, [sp, #-4]!
+        ldr     r2, [r2, #TI_ADDR_LIMIT]
+        sub     r2, r2, #4
+        cmp     r0, r2
+4:      bge     __put_user_bad
+        cmp     r0, #0x02000000
+        strlst  r1, [r0]
+        strge   r1, [r0]
+        mov     r0, #0
+        ldmfd   sp!, {pc}^
+
+        .global __put_user_8
+__put_user_8:
+        bic     ip, sp, #0x1f00
+        bic     ip, ip, #0x00ff
+        str     lr, [sp, #-4]!
+        ldr     ip, [ip, #TI_ADDR_LIMIT]
+        sub     ip, ip, #8
+        cmp     r0, ip
+        bge     __put_user_bad
+        cmp     r0, #0x02000000
+5:      strlst  r1, [r0], #4
+6:      strlst  r2, [r0]
+        strge   r1, [r0], #4
+        strge   r2, [r0]
+        mov     r0, #0
+        ldmfd   sp!, {pc}^
+
+__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