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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * __put_user functions.
4 *
5 * (C) Copyright 2005 Linus Torvalds
6 * (C) Copyright 2005 Andi Kleen
7 * (C) Copyright 2008 Glauber Costa
8 *
9 * These functions have a non-standard call interface
10 * to make them more efficient, especially as they
11 * return an error value in addition to the "real"
12 * return value.
13 */
14#include <linux/export.h>
15#include <linux/linkage.h>
16#include <asm/thread_info.h>
17#include <asm/errno.h>
18#include <asm/asm.h>
19#include <asm/smap.h>
20
21/*
22 * __put_user_X
23 *
24 * Inputs: %eax[:%edx] contains the data
25 * %ecx contains the address
26 *
27 * Outputs: %ecx is error code (0 or -EFAULT)
28 *
29 * Clobbers: %ebx needed for task pointer
30 *
31 * These functions should not modify any other registers,
32 * as they get called from within inline assembly.
33 */
34
35.macro check_range size:req
36.if IS_ENABLED(CONFIG_X86_64)
37 mov %rcx, %rbx
38 sar $63, %rbx
39 or %rbx, %rcx
40.else
41 cmp $TASK_SIZE_MAX-\size+1, %ecx
42 jae .Lbad_put_user
43.endif
44.endm
45
46.text
47SYM_FUNC_START(__put_user_1)
48 check_range size=1
49 ASM_STAC
501: movb %al,(%_ASM_CX)
51 xor %ecx,%ecx
52 ASM_CLAC
53 RET
54SYM_FUNC_END(__put_user_1)
55EXPORT_SYMBOL(__put_user_1)
56
57SYM_FUNC_START(__put_user_nocheck_1)
58 ASM_STAC
592: movb %al,(%_ASM_CX)
60 xor %ecx,%ecx
61 ASM_CLAC
62 RET
63SYM_FUNC_END(__put_user_nocheck_1)
64EXPORT_SYMBOL(__put_user_nocheck_1)
65
66SYM_FUNC_START(__put_user_2)
67 check_range size=2
68 ASM_STAC
693: movw %ax,(%_ASM_CX)
70 xor %ecx,%ecx
71 ASM_CLAC
72 RET
73SYM_FUNC_END(__put_user_2)
74EXPORT_SYMBOL(__put_user_2)
75
76SYM_FUNC_START(__put_user_nocheck_2)
77 ASM_STAC
784: movw %ax,(%_ASM_CX)
79 xor %ecx,%ecx
80 ASM_CLAC
81 RET
82SYM_FUNC_END(__put_user_nocheck_2)
83EXPORT_SYMBOL(__put_user_nocheck_2)
84
85SYM_FUNC_START(__put_user_4)
86 check_range size=4
87 ASM_STAC
885: movl %eax,(%_ASM_CX)
89 xor %ecx,%ecx
90 ASM_CLAC
91 RET
92SYM_FUNC_END(__put_user_4)
93EXPORT_SYMBOL(__put_user_4)
94
95SYM_FUNC_START(__put_user_nocheck_4)
96 ASM_STAC
976: movl %eax,(%_ASM_CX)
98 xor %ecx,%ecx
99 ASM_CLAC
100 RET
101SYM_FUNC_END(__put_user_nocheck_4)
102EXPORT_SYMBOL(__put_user_nocheck_4)
103
104SYM_FUNC_START(__put_user_8)
105 check_range size=8
106 ASM_STAC
1077: mov %_ASM_AX,(%_ASM_CX)
108#ifdef CONFIG_X86_32
1098: movl %edx,4(%_ASM_CX)
110#endif
111 xor %ecx,%ecx
112 ASM_CLAC
113 RET
114SYM_FUNC_END(__put_user_8)
115EXPORT_SYMBOL(__put_user_8)
116
117SYM_FUNC_START(__put_user_nocheck_8)
118 ASM_STAC
1199: mov %_ASM_AX,(%_ASM_CX)
120#ifdef CONFIG_X86_32
12110: movl %edx,4(%_ASM_CX)
122#endif
123 xor %ecx,%ecx
124 ASM_CLAC
125 RET
126SYM_FUNC_END(__put_user_nocheck_8)
127EXPORT_SYMBOL(__put_user_nocheck_8)
128
129SYM_CODE_START_LOCAL(__put_user_handle_exception)
130 ASM_CLAC
131.Lbad_put_user:
132 movl $-EFAULT,%ecx
133 RET
134SYM_CODE_END(__put_user_handle_exception)
135
136 _ASM_EXTABLE_UA(1b, __put_user_handle_exception)
137 _ASM_EXTABLE_UA(2b, __put_user_handle_exception)
138 _ASM_EXTABLE_UA(3b, __put_user_handle_exception)
139 _ASM_EXTABLE_UA(4b, __put_user_handle_exception)
140 _ASM_EXTABLE_UA(5b, __put_user_handle_exception)
141 _ASM_EXTABLE_UA(6b, __put_user_handle_exception)
142 _ASM_EXTABLE_UA(7b, __put_user_handle_exception)
143 _ASM_EXTABLE_UA(9b, __put_user_handle_exception)
144#ifdef CONFIG_X86_32
145 _ASM_EXTABLE_UA(8b, __put_user_handle_exception)
146 _ASM_EXTABLE_UA(10b, __put_user_handle_exception)
147#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * __put_user functions.
4 *
5 * (C) Copyright 2005 Linus Torvalds
6 * (C) Copyright 2005 Andi Kleen
7 * (C) Copyright 2008 Glauber Costa
8 *
9 * These functions have a non-standard call interface
10 * to make them more efficient, especially as they
11 * return an error value in addition to the "real"
12 * return value.
13 */
14#include <linux/linkage.h>
15#include <asm/thread_info.h>
16#include <asm/errno.h>
17#include <asm/asm.h>
18#include <asm/smap.h>
19#include <asm/export.h>
20
21
22/*
23 * __put_user_X
24 *
25 * Inputs: %eax[:%edx] contains the data
26 * %ecx contains the address
27 *
28 * Outputs: %eax is error code (0 or -EFAULT)
29 *
30 * These functions should not modify any other registers,
31 * as they get called from within inline assembly.
32 */
33
34#define ENTER mov PER_CPU_VAR(current_task), %_ASM_BX
35
36.text
37ENTRY(__put_user_1)
38 ENTER
39 cmp TASK_addr_limit(%_ASM_BX),%_ASM_CX
40 jae .Lbad_put_user
41 ASM_STAC
421: movb %al,(%_ASM_CX)
43 xor %eax,%eax
44 ASM_CLAC
45 ret
46ENDPROC(__put_user_1)
47EXPORT_SYMBOL(__put_user_1)
48
49ENTRY(__put_user_2)
50 ENTER
51 mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
52 sub $1,%_ASM_BX
53 cmp %_ASM_BX,%_ASM_CX
54 jae .Lbad_put_user
55 ASM_STAC
562: movw %ax,(%_ASM_CX)
57 xor %eax,%eax
58 ASM_CLAC
59 ret
60ENDPROC(__put_user_2)
61EXPORT_SYMBOL(__put_user_2)
62
63ENTRY(__put_user_4)
64 ENTER
65 mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
66 sub $3,%_ASM_BX
67 cmp %_ASM_BX,%_ASM_CX
68 jae .Lbad_put_user
69 ASM_STAC
703: movl %eax,(%_ASM_CX)
71 xor %eax,%eax
72 ASM_CLAC
73 ret
74ENDPROC(__put_user_4)
75EXPORT_SYMBOL(__put_user_4)
76
77ENTRY(__put_user_8)
78 ENTER
79 mov TASK_addr_limit(%_ASM_BX),%_ASM_BX
80 sub $7,%_ASM_BX
81 cmp %_ASM_BX,%_ASM_CX
82 jae .Lbad_put_user
83 ASM_STAC
844: mov %_ASM_AX,(%_ASM_CX)
85#ifdef CONFIG_X86_32
865: movl %edx,4(%_ASM_CX)
87#endif
88 xor %eax,%eax
89 ASM_CLAC
90 RET
91ENDPROC(__put_user_8)
92EXPORT_SYMBOL(__put_user_8)
93
94.Lbad_put_user_clac:
95 ASM_CLAC
96.Lbad_put_user:
97 movl $-EFAULT,%eax
98 RET
99
100 _ASM_EXTABLE_UA(1b, .Lbad_put_user_clac)
101 _ASM_EXTABLE_UA(2b, .Lbad_put_user_clac)
102 _ASM_EXTABLE_UA(3b, .Lbad_put_user_clac)
103 _ASM_EXTABLE_UA(4b, .Lbad_put_user_clac)
104#ifdef CONFIG_X86_32
105 _ASM_EXTABLE_UA(5b, .Lbad_put_user_clac)
106#endif