summaryrefslogtreecommitdiffstats
path: root/arch/x86/lib/copy_user_64.S
blob: fa997dfaef242fa9abdb28c20658a939caf72697 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/*
 * Copyright 2008 Vitaly Mayatskikh <vmayatsk@redhat.com>
 * Copyright 2002 Andi Kleen, SuSE Labs.
 * Subject to the GNU Public License v2.
 *
 * Functions to copy from and to user space.
 */

#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/current.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/cpufeature.h>
#include <asm/alternative-asm.h>
#include <asm/asm.h>
#include <asm/smap.h>

	.macro ALIGN_DESTINATION
	/* check for bad alignment of destination */
	movl %edi,%ecx
	andl $7,%ecx
	jz 102f				/* already aligned */
	subl $8,%ecx
	negl %ecx
	subl %ecx,%edx
100:	movb (%rsi),%al
101:	movb %al,(%rdi)
	incq %rsi
	incq %rdi
	decl %ecx
	jnz 100b
102:
	.section .fixup,"ax"
103:	addl %ecx,%edx			/* ecx is zerorest also */
	jmp copy_user_handle_tail
	.previous

	_ASM_EXTABLE(100b,103b)
	_ASM_EXTABLE(101b,103b)
	.endm

/* Standard copy_to_user with segment limit checking */
ENTRY(_copy_to_user)
	CFI_STARTPROC
	GET_THREAD_INFO(%rax)
	movq %rdi,%rcx
	addq %rdx,%rcx
	jc bad_to_user
	cmpq TI_addr_limit(%rax),%rcx
	ja bad_to_user
	ALTERNATIVE_2 "jmp copy_user_generic_unrolled",		\
		      "jmp copy_user_generic_string",		\
		      X86_FEATURE_REP_GOOD,			\
		      "jmp copy_user_enhanced_fast_string",	\
		      X86_FEATURE_ERMS
	CFI_ENDPROC
ENDPROC(_copy_to_user)

/* Standard copy_from_user with segment limit checking */
ENTRY(_copy_from_user)
	CFI_STARTPROC
	GET_THREAD_INFO(%rax)
	movq %rsi,%rcx
	addq %rdx,%rcx
	jc bad_from_user
	cmpq TI_addr_limit(%rax),%rcx
	ja bad_from_user
	ALTERNATIVE_2 "jmp copy_user_generic_unrolled",		\
		      "jmp copy_user_generic_string",		\
		      X86_FEATURE_REP_GOOD,			\
		      "jmp copy_user_enhanced_fast_string",	\
		      X86_FEATURE_ERMS
	CFI_ENDPROC
ENDPROC(_copy_from_user)

	.section .fixup,"ax"
	/* must zero dest */
ENTRY(bad_from_user)
bad_from_user:
	CFI_STARTPROC
	movl %edx,%ecx
	xorl %eax,%eax
	rep
	stosb
bad_to_user:
	movl %edx,%eax
	ret
	CFI_ENDPROC
ENDPROC(bad_from_user)
	.previous

/*
 * copy_user_generic_unrolled - memory copy with exception handling.
 * This version is for CPUs like P4 that don't have efficient micro
 * code for rep movsq
 *
 * Input:
 * rdi destination
 * rsi source
 * rdx count
 *
 * Output:
 * eax uncopied bytes or 0 if successful.
 */
ENTRY(copy_user_generic_unrolled)
	CFI_STARTPROC
	ASM_STAC
	cmpl $8,%edx
	jb 20f		/* less then 8 bytes, go to byte copy loop */
	ALIGN_DESTINATION
	movl %edx,%ecx
	andl $63,%edx
	shrl $6,%ecx
	jz 17f
1:	movq (%rsi),%r8
2:	movq 1*8(%rsi),%r9
3:	movq 2*8(%rsi),%r10
4:	movq 3*8(%rsi),%r11
5:	movq %r8,(%rdi)
6:	movq %r9,1*8(%rdi)
7:	movq %r10,2*8(%rdi)
8:	movq %r11,3*8(%rdi)
9:	movq 4*8(%rsi),%r8
10:	movq 5*8(%rsi),%r9
11:	movq 6*8(%rsi),%r10
12:	movq 7*8(%rsi),%r11
13:	movq %r8,4*8(%rdi)
14:	movq %r9,5*8(%rdi)
15:	movq %r10,6*8(%rdi)
16:	movq %r11,7*8(%rdi)
	leaq 64(%rsi),%rsi
	leaq 64(%rdi),%rdi
	decl %ecx
	jnz 1b
17:	movl %edx,%ecx
	andl $7,%edx
	shrl $3,%ecx
	jz 20f
18:	movq (%rsi),%r8
19:	movq %r8,(%rdi)
	leaq 8(%rsi),%rsi
	leaq 8(%rdi),%rdi
	decl %ecx
	jnz 18b
20:	andl %edx,%edx
	jz 23f
	movl %edx,%ecx
21:	movb (%rsi),%al
22:	movb %al,(%rdi)
	incq %rsi
	incq %rdi
	decl %ecx
	jnz 21b
23:	xor %eax,%eax
	ASM_CLAC
	ret

	.section .fixup,"ax"
30:	shll $6,%ecx
	addl %ecx,%edx
	jmp 60f
40:	leal (%rdx,%rcx,8),%edx
	jmp 60f
50:	movl %ecx,%edx
60:	jmp copy_user_handle_tail /* ecx is zerorest also */
	.previous

	_ASM_EXTABLE(1b,30b)
	_ASM_EXTABLE(2b,30b)
	_ASM_EXTABLE(3b,30b)
	_ASM_EXTABLE(4b,30b)
	_ASM_EXTABLE(5b,30b)
	_ASM_EXTABLE(6b,30b)
	_ASM_EXTABLE(7b,30b)
	_ASM_EXTABLE(8b,30b)
	_ASM_EXTABLE(9b,30b)
	_ASM_EXTABLE(10b,30b)
	_ASM_EXTABLE(11b,30b)
	_ASM_EXTABLE(12b,30b)
	_ASM_EXTABLE(13b,30b)
	_ASM_EXTABLE(14b,30b)
	_ASM_EXTABLE(15b,30b)
	_ASM_EXTABLE(16b,30b)
	_ASM_EXTABLE(18b,40b)
	_ASM_EXTABLE(19b,40b)
	_ASM_EXTABLE(21b,50b)
	_ASM_EXTABLE(22b,50b)
	CFI_ENDPROC
ENDPROC(copy_user_generic_unrolled)

/* Some CPUs run faster using the string copy instructions.
 * This is also a lot simpler. Use them when possible.
 *
 * Only 4GB of copy is supported. This shouldn't be a problem
 * because the kernel normally only writes from/to page sized chunks
 * even if user space passed a longer buffer.
 * And more would be dangerous because both Intel and AMD have
 * errata with rep movsq > 4GB. If someone feels the need to fix
 * this please consider this.
 *
 * Input:
 * rdi destination
 * rsi source
 * rdx count
 *
 * Output:
 * eax uncopied bytes or 0 if successful.
 */
ENTRY(copy_user_generic_string)
	CFI_STARTPROC
	ASM_STAC
	cmpl $8,%edx
	jb 2f		/* less than 8 bytes, go to byte copy loop */
	ALIGN_DESTINATION
	movl %edx,%ecx
	shrl $3,%ecx
	andl $7,%edx
1:	rep
	movsq
2:	movl %edx,%ecx
3:	rep
	movsb
	xorl %eax,%eax
	ASM_CLAC
	ret

	.section .fixup,"ax"
11:	leal (%rdx,%rcx,8),%ecx
12:	movl %ecx,%edx		/* ecx is zerorest also */
	jmp copy_user_handle_tail
	.previous

	_ASM_EXTABLE(1b,11b)
	_ASM_EXTABLE(3b,12b)
	CFI_ENDPROC
ENDPROC(copy_user_generic_string)

/*
 * Some CPUs are adding enhanced REP MOVSB/STOSB instructions.
 * It's recommended to use enhanced REP MOVSB/STOSB if it's enabled.
 *
 * Input:
 * rdi destination
 * rsi source
 * rdx count
 *
 * Output:
 * eax uncopied bytes or 0 if successful.
 */
ENTRY(copy_user_enhanced_fast_string)
	CFI_STARTPROC
	ASM_STAC
	movl %edx,%ecx
1:	rep
	movsb
	xorl %eax,%eax
	ASM_CLAC
	ret

	.section .fixup,"ax"
12:	movl %ecx,%edx		/* ecx is zerorest also */
	jmp copy_user_handle_tail
	.previous

	_ASM_EXTABLE(1b,12b)
	CFI_ENDPROC
ENDPROC(copy_user_enhanced_fast_string)
OpenPOWER on IntegriCloud