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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-08-13 06:44:13 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-08-13 06:44:13 -0400
commit080fc66fb5b6feae19fbbe8c6cbd7b11a4dac636 (patch)
treec275a107edc536ca22b5a7ac689a1fb0122efd0b /arch/arm/lib
parent730a8128cd8978467eb1cf546b11014acb57d433 (diff)
ARM: Bring back ARMv3 IO and user access code
This partially reverts 357c9c1f07d4546bc3fbc0fd1044d96b114d14ed (ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs). Although we only support StrongARM on the RiscPC, we need to keep the ARMv3 user access code for this platform because the bus does not understand half-word load/stores. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/Makefile23
-rw-r--r--arch/arm/lib/io-readsw-armv3.S106
-rw-r--r--arch/arm/lib/io-writesw-armv3.S126
-rw-r--r--arch/arm/lib/uaccess.S564
4 files changed, 816 insertions, 3 deletions
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 2473fd1fd51c..af72969820b4 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -16,13 +16,30 @@ lib-y := backtrace.o changebit.o csumipv6.o csumpartial.o \
16 call_with_stack.o 16 call_with_stack.o
17 17
18mmu-y := clear_user.o copy_page.o getuser.o putuser.o 18mmu-y := clear_user.o copy_page.o getuser.o putuser.o
19mmu-y += copy_from_user.o copy_to_user.o 19
20# the code in uaccess.S is not preemption safe and
21# probably faster on ARMv3 only
22ifeq ($(CONFIG_PREEMPT),y)
23 mmu-y += copy_from_user.o copy_to_user.o
24else
25ifneq ($(CONFIG_CPU_32v3),y)
26 mmu-y += copy_from_user.o copy_to_user.o
27else
28 mmu-y += uaccess.o
29endif
30endif
20 31
21# using lib_ here won't override already available weak symbols 32# using lib_ here won't override already available weak symbols
22obj-$(CONFIG_UACCESS_WITH_MEMCPY) += uaccess_with_memcpy.o 33obj-$(CONFIG_UACCESS_WITH_MEMCPY) += uaccess_with_memcpy.o
23 34
24lib-$(CONFIG_MMU) += $(mmu-y) 35lib-$(CONFIG_MMU) += $(mmu-y)
25lib-y += io-readsw-armv4.o io-writesw-armv4.o 36
37ifeq ($(CONFIG_CPU_32v3),y)
38 lib-y += io-readsw-armv3.o io-writesw-armv3.o
39else
40 lib-y += io-readsw-armv4.o io-writesw-armv4.o
41endif
42
26lib-$(CONFIG_ARCH_RPC) += ecard.o io-acorn.o floppydma.o 43lib-$(CONFIG_ARCH_RPC) += ecard.o io-acorn.o floppydma.o
27lib-$(CONFIG_ARCH_SHARK) += io-shark.o 44lib-$(CONFIG_ARCH_SHARK) += io-shark.o
28 45
diff --git a/arch/arm/lib/io-readsw-armv3.S b/arch/arm/lib/io-readsw-armv3.S
new file mode 100644
index 000000000000..88487c8c4f23
--- /dev/null
+++ b/arch/arm/lib/io-readsw-armv3.S
@@ -0,0 +1,106 @@
1/*
2 * linux/arch/arm/lib/io-readsw-armv3.S
3 *
4 * Copyright (C) 1995-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12
13.Linsw_bad_alignment:
14 adr r0, .Linsw_bad_align_msg
15 mov r2, lr
16 b panic
17.Linsw_bad_align_msg:
18 .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
19 .align
20
21.Linsw_align: tst r1, #1
22 bne .Linsw_bad_alignment
23
24 ldr r3, [r0]
25 strb r3, [r1], #1
26 mov r3, r3, lsr #8
27 strb r3, [r1], #1
28
29 subs r2, r2, #1
30 moveq pc, lr
31
32ENTRY(__raw_readsw)
33 teq r2, #0 @ do we have to check for the zero len?
34 moveq pc, lr
35 tst r1, #3
36 bne .Linsw_align
37
38.Linsw_aligned: mov ip, #0xff
39 orr ip, ip, ip, lsl #8
40 stmfd sp!, {r4, r5, r6, lr}
41
42 subs r2, r2, #8
43 bmi .Lno_insw_8
44
45.Linsw_8_lp: ldr r3, [r0]
46 and r3, r3, ip
47 ldr r4, [r0]
48 orr r3, r3, r4, lsl #16
49
50 ldr r4, [r0]
51 and r4, r4, ip
52 ldr r5, [r0]
53 orr r4, r4, r5, lsl #16
54
55 ldr r5, [r0]
56 and r5, r5, ip
57 ldr r6, [r0]
58 orr r5, r5, r6, lsl #16
59
60 ldr r6, [r0]
61 and r6, r6, ip
62 ldr lr, [r0]
63 orr r6, r6, lr, lsl #16
64
65 stmia r1!, {r3 - r6}
66
67 subs r2, r2, #8
68 bpl .Linsw_8_lp
69
70 tst r2, #7
71 ldmeqfd sp!, {r4, r5, r6, pc}
72
73.Lno_insw_8: tst r2, #4
74 beq .Lno_insw_4
75
76 ldr r3, [r0]
77 and r3, r3, ip
78 ldr r4, [r0]
79 orr r3, r3, r4, lsl #16
80
81 ldr r4, [r0]
82 and r4, r4, ip
83 ldr r5, [r0]
84 orr r4, r4, r5, lsl #16
85
86 stmia r1!, {r3, r4}
87
88.Lno_insw_4: tst r2, #2
89 beq .Lno_insw_2
90
91 ldr r3, [r0]
92 and r3, r3, ip
93 ldr r4, [r0]
94 orr r3, r3, r4, lsl #16
95
96 str r3, [r1], #4
97
98.Lno_insw_2: tst r2, #1
99 ldrne r3, [r0]
100 strneb r3, [r1], #1
101 movne r3, r3, lsr #8
102 strneb r3, [r1]
103
104 ldmfd sp!, {r4, r5, r6, pc}
105
106
diff --git a/arch/arm/lib/io-writesw-armv3.S b/arch/arm/lib/io-writesw-armv3.S
new file mode 100644
index 000000000000..49b800419e32
--- /dev/null
+++ b/arch/arm/lib/io-writesw-armv3.S
@@ -0,0 +1,126 @@
1/*
2 * linux/arch/arm/lib/io-writesw-armv3.S
3 *
4 * Copyright (C) 1995-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12
13.Loutsw_bad_alignment:
14 adr r0, .Loutsw_bad_align_msg
15 mov r2, lr
16 b panic
17.Loutsw_bad_align_msg:
18 .asciz "outsw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
19 .align
20
21.Loutsw_align: tst r1, #1
22 bne .Loutsw_bad_alignment
23
24 add r1, r1, #2
25
26 ldr r3, [r1, #-4]
27 mov r3, r3, lsr #16
28 orr r3, r3, r3, lsl #16
29 str r3, [r0]
30 subs r2, r2, #1
31 moveq pc, lr
32
33ENTRY(__raw_writesw)
34 teq r2, #0 @ do we have to check for the zero len?
35 moveq pc, lr
36 tst r1, #3
37 bne .Loutsw_align
38
39 stmfd sp!, {r4, r5, r6, lr}
40
41 subs r2, r2, #8
42 bmi .Lno_outsw_8
43
44.Loutsw_8_lp: ldmia r1!, {r3, r4, r5, r6}
45
46 mov ip, r3, lsl #16
47 orr ip, ip, ip, lsr #16
48 str ip, [r0]
49
50 mov ip, r3, lsr #16
51 orr ip, ip, ip, lsl #16
52 str ip, [r0]
53
54 mov ip, r4, lsl #16
55 orr ip, ip, ip, lsr #16
56 str ip, [r0]
57
58 mov ip, r4, lsr #16
59 orr ip, ip, ip, lsl #16
60 str ip, [r0]
61
62 mov ip, r5, lsl #16
63 orr ip, ip, ip, lsr #16
64 str ip, [r0]
65
66 mov ip, r5, lsr #16
67 orr ip, ip, ip, lsl #16
68 str ip, [r0]
69
70 mov ip, r6, lsl #16
71 orr ip, ip, ip, lsr #16
72 str ip, [r0]
73
74 mov ip, r6, lsr #16
75 orr ip, ip, ip, lsl #16
76 str ip, [r0]
77
78 subs r2, r2, #8
79 bpl .Loutsw_8_lp
80
81 tst r2, #7
82 ldmeqfd sp!, {r4, r5, r6, pc}
83
84.Lno_outsw_8: tst r2, #4
85 beq .Lno_outsw_4
86
87 ldmia r1!, {r3, r4}
88
89 mov ip, r3, lsl #16
90 orr ip, ip, ip, lsr #16
91 str ip, [r0]
92
93 mov ip, r3, lsr #16
94 orr ip, ip, ip, lsl #16
95 str ip, [r0]
96
97 mov ip, r4, lsl #16
98 orr ip, ip, ip, lsr #16
99 str ip, [r0]
100
101 mov ip, r4, lsr #16
102 orr ip, ip, ip, lsl #16
103 str ip, [r0]
104
105.Lno_outsw_4: tst r2, #2
106 beq .Lno_outsw_2
107
108 ldr r3, [r1], #4
109
110 mov ip, r3, lsl #16
111 orr ip, ip, ip, lsr #16
112 str ip, [r0]
113
114 mov ip, r3, lsr #16
115 orr ip, ip, ip, lsl #16
116 str ip, [r0]
117
118.Lno_outsw_2: tst r2, #1
119
120 ldrne r3, [r1]
121
122 movne ip, r3, lsl #16
123 orrne ip, ip, ip, lsr #16
124 strne ip, [r0]
125
126 ldmfd sp!, {r4, r5, r6, pc}
diff --git a/arch/arm/lib/uaccess.S b/arch/arm/lib/uaccess.S
new file mode 100644
index 000000000000..5c908b1cb8ed
--- /dev/null
+++ b/arch/arm/lib/uaccess.S
@@ -0,0 +1,564 @@
1/*
2 * linux/arch/arm/lib/uaccess.S
3 *
4 * Copyright (C) 1995, 1996,1997,1998 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Routines to block copy data to/from user memory
11 * These are highly optimised both for the 4k page size
12 * and for various alignments.
13 */
14#include <linux/linkage.h>
15#include <asm/assembler.h>
16#include <asm/errno.h>
17#include <asm/domain.h>
18
19 .text
20
21#define PAGE_SHIFT 12
22
23/* Prototype: int __copy_to_user(void *to, const char *from, size_t n)
24 * Purpose : copy a block to user memory from kernel memory
25 * Params : to - user memory
26 * : from - kernel memory
27 * : n - number of bytes to copy
28 * Returns : Number of bytes NOT copied.
29 */
30
31.Lc2u_dest_not_aligned:
32 rsb ip, ip, #4
33 cmp ip, #2
34 ldrb r3, [r1], #1
35USER( TUSER( strb) r3, [r0], #1) @ May fault
36 ldrgeb r3, [r1], #1
37USER( TUSER( strgeb) r3, [r0], #1) @ May fault
38 ldrgtb r3, [r1], #1
39USER( TUSER( strgtb) r3, [r0], #1) @ May fault
40 sub r2, r2, ip
41 b .Lc2u_dest_aligned
42
43ENTRY(__copy_to_user)
44 stmfd sp!, {r2, r4 - r7, lr}
45 cmp r2, #4
46 blt .Lc2u_not_enough
47 ands ip, r0, #3
48 bne .Lc2u_dest_not_aligned
49.Lc2u_dest_aligned:
50
51 ands ip, r1, #3
52 bne .Lc2u_src_not_aligned
53/*
54 * Seeing as there has to be at least 8 bytes to copy, we can
55 * copy one word, and force a user-mode page fault...
56 */
57
58.Lc2u_0fupi: subs r2, r2, #4
59 addmi ip, r2, #4
60 bmi .Lc2u_0nowords
61 ldr r3, [r1], #4
62USER( TUSER( str) r3, [r0], #4) @ May fault
63 mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
64 rsb ip, ip, #0
65 movs ip, ip, lsr #32 - PAGE_SHIFT
66 beq .Lc2u_0fupi
67/*
68 * ip = max no. of bytes to copy before needing another "strt" insn
69 */
70 cmp r2, ip
71 movlt ip, r2
72 sub r2, r2, ip
73 subs ip, ip, #32
74 blt .Lc2u_0rem8lp
75
76.Lc2u_0cpy8lp: ldmia r1!, {r3 - r6}
77 stmia r0!, {r3 - r6} @ Shouldnt fault
78 ldmia r1!, {r3 - r6}
79 subs ip, ip, #32
80 stmia r0!, {r3 - r6} @ Shouldnt fault
81 bpl .Lc2u_0cpy8lp
82
83.Lc2u_0rem8lp: cmn ip, #16
84 ldmgeia r1!, {r3 - r6}
85 stmgeia r0!, {r3 - r6} @ Shouldnt fault
86 tst ip, #8
87 ldmneia r1!, {r3 - r4}
88 stmneia r0!, {r3 - r4} @ Shouldnt fault
89 tst ip, #4
90 ldrne r3, [r1], #4
91 TUSER( strne) r3, [r0], #4 @ Shouldnt fault
92 ands ip, ip, #3
93 beq .Lc2u_0fupi
94.Lc2u_0nowords: teq ip, #0
95 beq .Lc2u_finished
96.Lc2u_nowords: cmp ip, #2
97 ldrb r3, [r1], #1
98USER( TUSER( strb) r3, [r0], #1) @ May fault
99 ldrgeb r3, [r1], #1
100USER( TUSER( strgeb) r3, [r0], #1) @ May fault
101 ldrgtb r3, [r1], #1
102USER( TUSER( strgtb) r3, [r0], #1) @ May fault
103 b .Lc2u_finished
104
105.Lc2u_not_enough:
106 movs ip, r2
107 bne .Lc2u_nowords
108.Lc2u_finished: mov r0, #0
109 ldmfd sp!, {r2, r4 - r7, pc}
110
111.Lc2u_src_not_aligned:
112 bic r1, r1, #3
113 ldr r7, [r1], #4
114 cmp ip, #2
115 bgt .Lc2u_3fupi
116 beq .Lc2u_2fupi
117.Lc2u_1fupi: subs r2, r2, #4
118 addmi ip, r2, #4
119 bmi .Lc2u_1nowords
120 mov r3, r7, pull #8
121 ldr r7, [r1], #4
122 orr r3, r3, r7, push #24
123USER( TUSER( str) r3, [r0], #4) @ May fault
124 mov ip, r0, lsl #32 - PAGE_SHIFT
125 rsb ip, ip, #0
126 movs ip, ip, lsr #32 - PAGE_SHIFT
127 beq .Lc2u_1fupi
128 cmp r2, ip
129 movlt ip, r2
130 sub r2, r2, ip
131 subs ip, ip, #16
132 blt .Lc2u_1rem8lp
133
134.Lc2u_1cpy8lp: mov r3, r7, pull #8
135 ldmia r1!, {r4 - r7}
136 subs ip, ip, #16
137 orr r3, r3, r4, push #24
138 mov r4, r4, pull #8
139 orr r4, r4, r5, push #24
140 mov r5, r5, pull #8
141 orr r5, r5, r6, push #24
142 mov r6, r6, pull #8
143 orr r6, r6, r7, push #24
144 stmia r0!, {r3 - r6} @ Shouldnt fault
145 bpl .Lc2u_1cpy8lp
146
147.Lc2u_1rem8lp: tst ip, #8
148 movne r3, r7, pull #8
149 ldmneia r1!, {r4, r7}
150 orrne r3, r3, r4, push #24
151 movne r4, r4, pull #8
152 orrne r4, r4, r7, push #24
153 stmneia r0!, {r3 - r4} @ Shouldnt fault
154 tst ip, #4
155 movne r3, r7, pull #8
156 ldrne r7, [r1], #4
157 orrne r3, r3, r7, push #24
158 TUSER( strne) r3, [r0], #4 @ Shouldnt fault
159 ands ip, ip, #3
160 beq .Lc2u_1fupi
161.Lc2u_1nowords: mov r3, r7, get_byte_1
162 teq ip, #0
163 beq .Lc2u_finished
164 cmp ip, #2
165USER( TUSER( strb) r3, [r0], #1) @ May fault
166 movge r3, r7, get_byte_2
167USER( TUSER( strgeb) r3, [r0], #1) @ May fault
168 movgt r3, r7, get_byte_3
169USER( TUSER( strgtb) r3, [r0], #1) @ May fault
170 b .Lc2u_finished
171
172.Lc2u_2fupi: subs r2, r2, #4
173 addmi ip, r2, #4
174 bmi .Lc2u_2nowords
175 mov r3, r7, pull #16
176 ldr r7, [r1], #4
177 orr r3, r3, r7, push #16
178USER( TUSER( str) r3, [r0], #4) @ May fault
179 mov ip, r0, lsl #32 - PAGE_SHIFT
180 rsb ip, ip, #0
181 movs ip, ip, lsr #32 - PAGE_SHIFT
182 beq .Lc2u_2fupi
183 cmp r2, ip
184 movlt ip, r2
185 sub r2, r2, ip
186 subs ip, ip, #16
187 blt .Lc2u_2rem8lp
188
189.Lc2u_2cpy8lp: mov r3, r7, pull #16
190 ldmia r1!, {r4 - r7}
191 subs ip, ip, #16
192 orr r3, r3, r4, push #16
193 mov r4, r4, pull #16
194 orr r4, r4, r5, push #16
195 mov r5, r5, pull #16
196 orr r5, r5, r6, push #16
197 mov r6, r6, pull #16
198 orr r6, r6, r7, push #16
199 stmia r0!, {r3 - r6} @ Shouldnt fault
200 bpl .Lc2u_2cpy8lp
201
202.Lc2u_2rem8lp: tst ip, #8
203 movne r3, r7, pull #16
204 ldmneia r1!, {r4, r7}
205 orrne r3, r3, r4, push #16
206 movne r4, r4, pull #16
207 orrne r4, r4, r7, push #16
208 stmneia r0!, {r3 - r4} @ Shouldnt fault
209 tst ip, #4
210 movne r3, r7, pull #16
211 ldrne r7, [r1], #4
212 orrne r3, r3, r7, push #16
213 TUSER( strne) r3, [r0], #4 @ Shouldnt fault
214 ands ip, ip, #3
215 beq .Lc2u_2fupi
216.Lc2u_2nowords: mov r3, r7, get_byte_2
217 teq ip, #0
218 beq .Lc2u_finished
219 cmp ip, #2
220USER( TUSER( strb) r3, [r0], #1) @ May fault
221 movge r3, r7, get_byte_3
222USER( TUSER( strgeb) r3, [r0], #1) @ May fault
223 ldrgtb r3, [r1], #0
224USER( TUSER( strgtb) r3, [r0], #1) @ May fault
225 b .Lc2u_finished
226
227.Lc2u_3fupi: subs r2, r2, #4
228 addmi ip, r2, #4
229 bmi .Lc2u_3nowords
230 mov r3, r7, pull #24
231 ldr r7, [r1], #4
232 orr r3, r3, r7, push #8
233USER( TUSER( str) r3, [r0], #4) @ May fault
234 mov ip, r0, lsl #32 - PAGE_SHIFT
235 rsb ip, ip, #0
236 movs ip, ip, lsr #32 - PAGE_SHIFT
237 beq .Lc2u_3fupi
238 cmp r2, ip
239 movlt ip, r2
240 sub r2, r2, ip
241 subs ip, ip, #16
242 blt .Lc2u_3rem8lp
243
244.Lc2u_3cpy8lp: mov r3, r7, pull #24
245 ldmia r1!, {r4 - r7}
246 subs ip, ip, #16
247 orr r3, r3, r4, push #8
248 mov r4, r4, pull #24
249 orr r4, r4, r5, push #8
250 mov r5, r5, pull #24
251 orr r5, r5, r6, push #8
252 mov r6, r6, pull #24
253 orr r6, r6, r7, push #8
254 stmia r0!, {r3 - r6} @ Shouldnt fault
255 bpl .Lc2u_3cpy8lp
256
257.Lc2u_3rem8lp: tst ip, #8
258 movne r3, r7, pull #24
259 ldmneia r1!, {r4, r7}
260 orrne r3, r3, r4, push #8
261 movne r4, r4, pull #24
262 orrne r4, r4, r7, push #8
263 stmneia r0!, {r3 - r4} @ Shouldnt fault
264 tst ip, #4
265 movne r3, r7, pull #24
266 ldrne r7, [r1], #4
267 orrne r3, r3, r7, push #8
268 TUSER( strne) r3, [r0], #4 @ Shouldnt fault
269 ands ip, ip, #3
270 beq .Lc2u_3fupi
271.Lc2u_3nowords: mov r3, r7, get_byte_3
272 teq ip, #0
273 beq .Lc2u_finished
274 cmp ip, #2
275USER( TUSER( strb) r3, [r0], #1) @ May fault
276 ldrgeb r3, [r1], #1
277USER( TUSER( strgeb) r3, [r0], #1) @ May fault
278 ldrgtb r3, [r1], #0
279USER( TUSER( strgtb) r3, [r0], #1) @ May fault
280 b .Lc2u_finished
281ENDPROC(__copy_to_user)
282
283 .pushsection .fixup,"ax"
284 .align 0
2859001: ldmfd sp!, {r0, r4 - r7, pc}
286 .popsection
287
288/* Prototype: unsigned long __copy_from_user(void *to,const void *from,unsigned long n);
289 * Purpose : copy a block from user memory to kernel memory
290 * Params : to - kernel memory
291 * : from - user memory
292 * : n - number of bytes to copy
293 * Returns : Number of bytes NOT copied.
294 */
295.Lcfu_dest_not_aligned:
296 rsb ip, ip, #4
297 cmp ip, #2
298USER( TUSER( ldrb) r3, [r1], #1) @ May fault
299 strb r3, [r0], #1
300USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault
301 strgeb r3, [r0], #1
302USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault
303 strgtb r3, [r0], #1
304 sub r2, r2, ip
305 b .Lcfu_dest_aligned
306
307ENTRY(__copy_from_user)
308 stmfd sp!, {r0, r2, r4 - r7, lr}
309 cmp r2, #4
310 blt .Lcfu_not_enough
311 ands ip, r0, #3
312 bne .Lcfu_dest_not_aligned
313.Lcfu_dest_aligned:
314 ands ip, r1, #3
315 bne .Lcfu_src_not_aligned
316
317/*
318 * Seeing as there has to be at least 8 bytes to copy, we can
319 * copy one word, and force a user-mode page fault...
320 */
321
322.Lcfu_0fupi: subs r2, r2, #4
323 addmi ip, r2, #4
324 bmi .Lcfu_0nowords
325USER( TUSER( ldr) r3, [r1], #4)
326 str r3, [r0], #4
327 mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
328 rsb ip, ip, #0
329 movs ip, ip, lsr #32 - PAGE_SHIFT
330 beq .Lcfu_0fupi
331/*
332 * ip = max no. of bytes to copy before needing another "strt" insn
333 */
334 cmp r2, ip
335 movlt ip, r2
336 sub r2, r2, ip
337 subs ip, ip, #32
338 blt .Lcfu_0rem8lp
339
340.Lcfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault
341 stmia r0!, {r3 - r6}
342 ldmia r1!, {r3 - r6} @ Shouldnt fault
343 subs ip, ip, #32
344 stmia r0!, {r3 - r6}
345 bpl .Lcfu_0cpy8lp
346
347.Lcfu_0rem8lp: cmn ip, #16
348 ldmgeia r1!, {r3 - r6} @ Shouldnt fault
349 stmgeia r0!, {r3 - r6}
350 tst ip, #8
351 ldmneia r1!, {r3 - r4} @ Shouldnt fault
352 stmneia r0!, {r3 - r4}
353 tst ip, #4
354 TUSER( ldrne) r3, [r1], #4 @ Shouldnt fault
355 strne r3, [r0], #4
356 ands ip, ip, #3
357 beq .Lcfu_0fupi
358.Lcfu_0nowords: teq ip, #0
359 beq .Lcfu_finished
360.Lcfu_nowords: cmp ip, #2
361USER( TUSER( ldrb) r3, [r1], #1) @ May fault
362 strb r3, [r0], #1
363USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault
364 strgeb r3, [r0], #1
365USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault
366 strgtb r3, [r0], #1
367 b .Lcfu_finished
368
369.Lcfu_not_enough:
370 movs ip, r2
371 bne .Lcfu_nowords
372.Lcfu_finished: mov r0, #0
373 add sp, sp, #8
374 ldmfd sp!, {r4 - r7, pc}
375
376.Lcfu_src_not_aligned:
377 bic r1, r1, #3
378USER( TUSER( ldr) r7, [r1], #4) @ May fault
379 cmp ip, #2
380 bgt .Lcfu_3fupi
381 beq .Lcfu_2fupi
382.Lcfu_1fupi: subs r2, r2, #4
383 addmi ip, r2, #4
384 bmi .Lcfu_1nowords
385 mov r3, r7, pull #8
386USER( TUSER( ldr) r7, [r1], #4) @ May fault
387 orr r3, r3, r7, push #24
388 str r3, [r0], #4
389 mov ip, r1, lsl #32 - PAGE_SHIFT
390 rsb ip, ip, #0
391 movs ip, ip, lsr #32 - PAGE_SHIFT
392 beq .Lcfu_1fupi
393 cmp r2, ip
394 movlt ip, r2
395 sub r2, r2, ip
396 subs ip, ip, #16
397 blt .Lcfu_1rem8lp
398
399.Lcfu_1cpy8lp: mov r3, r7, pull #8
400 ldmia r1!, {r4 - r7} @ Shouldnt fault
401 subs ip, ip, #16
402 orr r3, r3, r4, push #24
403 mov r4, r4, pull #8
404 orr r4, r4, r5, push #24
405 mov r5, r5, pull #8
406 orr r5, r5, r6, push #24
407 mov r6, r6, pull #8
408 orr r6, r6, r7, push #24
409 stmia r0!, {r3 - r6}
410 bpl .Lcfu_1cpy8lp
411
412.Lcfu_1rem8lp: tst ip, #8
413 movne r3, r7, pull #8
414 ldmneia r1!, {r4, r7} @ Shouldnt fault
415 orrne r3, r3, r4, push #24
416 movne r4, r4, pull #8
417 orrne r4, r4, r7, push #24
418 stmneia r0!, {r3 - r4}
419 tst ip, #4
420 movne r3, r7, pull #8
421USER( TUSER( ldrne) r7, [r1], #4) @ May fault
422 orrne r3, r3, r7, push #24
423 strne r3, [r0], #4
424 ands ip, ip, #3
425 beq .Lcfu_1fupi
426.Lcfu_1nowords: mov r3, r7, get_byte_1
427 teq ip, #0
428 beq .Lcfu_finished
429 cmp ip, #2
430 strb r3, [r0], #1
431 movge r3, r7, get_byte_2
432 strgeb r3, [r0], #1
433 movgt r3, r7, get_byte_3
434 strgtb r3, [r0], #1
435 b .Lcfu_finished
436
437.Lcfu_2fupi: subs r2, r2, #4
438 addmi ip, r2, #4
439 bmi .Lcfu_2nowords
440 mov r3, r7, pull #16
441USER( TUSER( ldr) r7, [r1], #4) @ May fault
442 orr r3, r3, r7, push #16
443 str r3, [r0], #4
444 mov ip, r1, lsl #32 - PAGE_SHIFT
445 rsb ip, ip, #0
446 movs ip, ip, lsr #32 - PAGE_SHIFT
447 beq .Lcfu_2fupi
448 cmp r2, ip
449 movlt ip, r2
450 sub r2, r2, ip
451 subs ip, ip, #16
452 blt .Lcfu_2rem8lp
453
454
455.Lcfu_2cpy8lp: mov r3, r7, pull #16
456 ldmia r1!, {r4 - r7} @ Shouldnt fault
457 subs ip, ip, #16
458 orr r3, r3, r4, push #16
459 mov r4, r4, pull #16
460 orr r4, r4, r5, push #16
461 mov r5, r5, pull #16
462 orr r5, r5, r6, push #16
463 mov r6, r6, pull #16
464 orr r6, r6, r7, push #16
465 stmia r0!, {r3 - r6}
466 bpl .Lcfu_2cpy8lp
467
468.Lcfu_2rem8lp: tst ip, #8
469 movne r3, r7, pull #16
470 ldmneia r1!, {r4, r7} @ Shouldnt fault
471 orrne r3, r3, r4, push #16
472 movne r4, r4, pull #16
473 orrne r4, r4, r7, push #16
474 stmneia r0!, {r3 - r4}
475 tst ip, #4
476 movne r3, r7, pull #16
477USER( TUSER( ldrne) r7, [r1], #4) @ May fault
478 orrne r3, r3, r7, push #16
479 strne r3, [r0], #4
480 ands ip, ip, #3
481 beq .Lcfu_2fupi
482.Lcfu_2nowords: mov r3, r7, get_byte_2
483 teq ip, #0
484 beq .Lcfu_finished
485 cmp ip, #2
486 strb r3, [r0], #1
487 movge r3, r7, get_byte_3
488 strgeb r3, [r0], #1
489USER( TUSER( ldrgtb) r3, [r1], #0) @ May fault
490 strgtb r3, [r0], #1
491 b .Lcfu_finished
492
493.Lcfu_3fupi: subs r2, r2, #4
494 addmi ip, r2, #4
495 bmi .Lcfu_3nowords
496 mov r3, r7, pull #24
497USER( TUSER( ldr) r7, [r1], #4) @ May fault
498 orr r3, r3, r7, push #8
499 str r3, [r0], #4
500 mov ip, r1, lsl #32 - PAGE_SHIFT
501 rsb ip, ip, #0
502 movs ip, ip, lsr #32 - PAGE_SHIFT
503 beq .Lcfu_3fupi
504 cmp r2, ip
505 movlt ip, r2
506 sub r2, r2, ip
507 subs ip, ip, #16
508 blt .Lcfu_3rem8lp
509
510.Lcfu_3cpy8lp: mov r3, r7, pull #24
511 ldmia r1!, {r4 - r7} @ Shouldnt fault
512 orr r3, r3, r4, push #8
513 mov r4, r4, pull #24
514 orr r4, r4, r5, push #8
515 mov r5, r5, pull #24
516 orr r5, r5, r6, push #8
517 mov r6, r6, pull #24
518 orr r6, r6, r7, push #8
519 stmia r0!, {r3 - r6}
520 subs ip, ip, #16
521 bpl .Lcfu_3cpy8lp
522
523.Lcfu_3rem8lp: tst ip, #8
524 movne r3, r7, pull #24
525 ldmneia r1!, {r4, r7} @ Shouldnt fault
526 orrne r3, r3, r4, push #8
527 movne r4, r4, pull #24
528 orrne r4, r4, r7, push #8
529 stmneia r0!, {r3 - r4}
530 tst ip, #4
531 movne r3, r7, pull #24
532USER( TUSER( ldrne) r7, [r1], #4) @ May fault
533 orrne r3, r3, r7, push #8
534 strne r3, [r0], #4
535 ands ip, ip, #3
536 beq .Lcfu_3fupi
537.Lcfu_3nowords: mov r3, r7, get_byte_3
538 teq ip, #0
539 beq .Lcfu_finished
540 cmp ip, #2
541 strb r3, [r0], #1
542USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault
543 strgeb r3, [r0], #1
544USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault
545 strgtb r3, [r0], #1
546 b .Lcfu_finished
547ENDPROC(__copy_from_user)
548
549 .pushsection .fixup,"ax"
550 .align 0
551 /*
552 * We took an exception. r0 contains a pointer to
553 * the byte not copied.
554 */
5559001: ldr r2, [sp], #4 @ void *to
556 sub r2, r0, r2 @ bytes copied
557 ldr r1, [sp], #4 @ unsigned long count
558 subs r4, r1, r2 @ bytes left to copy
559 movne r1, r4
560 blne __memzero
561 mov r0, r4
562 ldmfd sp!, {r4 - r7, pc}
563 .popsection
564
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