2 * linux/arch/arm/lib/copy_from_user.S
4 * Author: Nicolas Pitre
5 * Created: Sep 29, 2005
6 * Copyright: MontaVista Software, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/linkage.h>
14 #include <asm/assembler.h>
15 #include <asm/unwind.h>
16 #include <asm/export.h>
21 * size_t arm_copy_from_user(void *to, const void *from, size_t n)
25 * copy a block to kernel memory from user memory
31 * n = number of bytes to copy
35 * Number of bytes NOT copied.
38 #ifndef CONFIG_THUMB2_KERNEL
45 .macro ldr1w ptr reg abort
46 ldrusr \reg, \ptr, 4, abort=\abort
49 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
50 ldr1w \ptr, \reg1, \abort
51 ldr1w \ptr, \reg2, \abort
52 ldr1w \ptr, \reg3, \abort
53 ldr1w \ptr, \reg4, \abort
56 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
57 ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
58 ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
61 .macro ldr1b ptr reg cond=al abort
62 ldrusr \reg, \ptr, 1, \cond, abort=\abort
65 .macro str1w ptr reg abort
66 W(str) \reg, [\ptr], #4
69 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
70 stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
73 .macro str1b ptr reg cond=al abort
74 str\cond\()b \reg, [\ptr], #1
77 .macro enter reg1 reg2
79 stmdb sp!, {r0, r2, r3, \reg1, \reg2}
82 .macro usave reg1 reg2
83 UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
88 ldmfd sp!, {r0, \reg1, \reg2}
93 ENTRY(arm_copy_from_user)
95 #include "copy_template.S"
97 ENDPROC(arm_copy_from_user)
98 EXPORT_SYMBOL(arm_copy_from_user)
100 .pushsection .fixup,"ax"