1 files changed, 101 insertions, 0 deletions

diff --git a/arch/arm/lib/copy_to_user.S b/arch/arm/lib/copy_to_user.S
new file mode 100644
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+++ b/arch/arm/lib/copy_to_user.S
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+/*
+ *  linux/arch/arm/lib/copy_to_user.S
+ *
+ *  Author:     Nicolas Pitre
+ *  Created:    Sep 29, 2005
+ *  Copyright:  MontaVista Software, Inc.
+ *
+ *  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.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Prototype:
+ *
+ *      size_t __arch_copy_to_user(void *to, const void *from, size_t n)
+ *
+ * Purpose:
+ *
+ *      copy a block to user memory from kernel memory
+ *
+ * Params:
+ *
+ *      to = user memory
+ *      from = kernel memory
+ *      n = number of bytes to copy
+ *
+ * Return value:
+ *
+ *      Number of bytes NOT copied.
+ */
+
+        .macro ldr1w ptr reg abort
+        ldr \reg, [\ptr], #4
+        .endm
+
+        .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
+        ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
+        .endm
+
+        .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+        ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
+        .endm
+
+        .macro ldr1b ptr reg cond=al abort
+        ldr\cond\()b \reg, [\ptr], #1
+        .endm
+
+        .macro str1w ptr reg abort
+100:    strt \reg, [\ptr], #4
+        .section __ex_table, "a"
+        .long 100b, \abort
+        .previous
+        .endm
+
+        .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
+        str1w \ptr, \reg1, \abort
+        str1w \ptr, \reg2, \abort
+        str1w \ptr, \reg3, \abort
+        str1w \ptr, \reg4, \abort
+        str1w \ptr, \reg5, \abort
+        str1w \ptr, \reg6, \abort
+        str1w \ptr, \reg7, \abort
+        str1w \ptr, \reg8, \abort
+        .endm
+
+        .macro str1b ptr reg cond=al abort
+100:    str\cond\()bt \reg, [\ptr], #1
+        .section __ex_table, "a"
+        .long 100b, \abort
+        .previous
+        .endm
+
+        .macro enter reg1 reg2
+        mov     r3, #0
+        stmdb   sp!, {r0, r2, r3, \reg1, \reg2}
+        .endm
+
+        .macro exit reg1 reg2
+        add     sp, sp, #8
+        ldmfd   sp!, {r0, \reg1, \reg2}
+        .endm
+
+        .text
+
+ENTRY(__arch_copy_to_user)
+
+#include "copy_template.S"
+
+        .section .fixup,"ax"
+        .align 0
+        copy_abort_preamble
+        ldmfd   sp!, {r1, r2, r3}
+        sub     r0, r0, r1
+        rsb     r0, r0, r2
+        copy_abort_end
+        .previous
+