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>
20 * size_t arm_copy_from_user(void *to, const void *from, size_t n)
24 * copy a block to kernel memory from user memory
30 * n = number of bytes to copy
34 * Number of bytes NOT copied.
37 #ifdef CONFIG_CPU_USE_DOMAINS
39 #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
65 .macro ldr1w ptr reg abort
66 USERL(\abort, W(ldr) \reg, [\ptr], #4)
69 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
70 USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4})
73 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
74 USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8})
77 #endif /* CONFIG_CPU_USE_DOMAINS */
79 .macro ldr1b ptr reg cond=al abort
80 ldrusr \reg, \ptr, 1, \cond, abort=\abort
85 .macro str1w ptr reg abort
86 W(str) \reg, [\ptr], #4
89 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
90 stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
93 .macro str1b ptr reg cond=al abort
94 strb\cond \reg, [\ptr], #1
97 .macro enter reg1 reg2
99 stmdb sp!, {r0, r2, r3, \reg1, \reg2}
102 .macro usave reg1 reg2
103 UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
106 .macro exit reg1 reg2
108 ldmfd sp!, {r0, \reg1, \reg2}
113 ENTRY(arm_copy_from_user)
114 #ifdef CONFIG_CPU_SPECTRE
116 ldr r3, [r3, #TI_ADDR_LIMIT]
117 uaccess_mask_range_ptr r1, r2, r3, ip
120 #include "copy_template.S"
122 ENDPROC(arm_copy_from_user)
124 .pushsection .fixup,"ax"
127 ldmfd sp!, {r1, r2, r3}