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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_ASM_H
3#define _ASM_X86_ASM_H
4
5#ifdef __ASSEMBLY__
6# define __ASM_FORM(x) x
7# define __ASM_FORM_RAW(x) x
8# define __ASM_FORM_COMMA(x) x,
9#else
10# define __ASM_FORM(x) " " #x " "
11# define __ASM_FORM_RAW(x) #x
12# define __ASM_FORM_COMMA(x) " " #x ","
13#endif
14
15#ifndef __x86_64__
16/* 32 bit */
17# define __ASM_SEL(a,b) __ASM_FORM(a)
18# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
19#else
20/* 64 bit */
21# define __ASM_SEL(a,b) __ASM_FORM(b)
22# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
23#endif
24
25#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
26 inst##q##__VA_ARGS__)
27#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
28
29#define _ASM_PTR __ASM_SEL(.long, .quad)
30#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
31
32#define _ASM_MOV __ASM_SIZE(mov)
33#define _ASM_INC __ASM_SIZE(inc)
34#define _ASM_DEC __ASM_SIZE(dec)
35#define _ASM_ADD __ASM_SIZE(add)
36#define _ASM_SUB __ASM_SIZE(sub)
37#define _ASM_XADD __ASM_SIZE(xadd)
38#define _ASM_MUL __ASM_SIZE(mul)
39
40#define _ASM_AX __ASM_REG(ax)
41#define _ASM_BX __ASM_REG(bx)
42#define _ASM_CX __ASM_REG(cx)
43#define _ASM_DX __ASM_REG(dx)
44#define _ASM_SP __ASM_REG(sp)
45#define _ASM_BP __ASM_REG(bp)
46#define _ASM_SI __ASM_REG(si)
47#define _ASM_DI __ASM_REG(di)
48
49/*
50 * Macros to generate condition code outputs from inline assembly,
51 * The output operand must be type "bool".
52 */
53#ifdef __GCC_ASM_FLAG_OUTPUTS__
54# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
55# define CC_OUT(c) "=@cc" #c
56#else
57# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
58# define CC_OUT(c) [_cc_ ## c] "=qm"
59#endif
60
61/* Exception table entry */
62#ifdef __ASSEMBLY__
63# define _ASM_EXTABLE_HANDLE(from, to, handler) \
64 .pushsection "__ex_table","a" ; \
65 .balign 4 ; \
66 .long (from) - . ; \
67 .long (to) - . ; \
68 .long (handler) - . ; \
69 .popsection
70
71# define _ASM_EXTABLE(from, to) \
72 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
73
74# define _ASM_EXTABLE_FAULT(from, to) \
75 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
76
77# define _ASM_EXTABLE_EX(from, to) \
78 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
79
80# define _ASM_EXTABLE_REFCOUNT(from, to) \
81 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
82
83# define _ASM_NOKPROBE(entry) \
84 .pushsection "_kprobe_blacklist","aw" ; \
85 _ASM_ALIGN ; \
86 _ASM_PTR (entry); \
87 .popsection
88
89.macro ALIGN_DESTINATION
90 /* check for bad alignment of destination */
91 movl %edi,%ecx
92 andl $7,%ecx
93 jz 102f /* already aligned */
94 subl $8,%ecx
95 negl %ecx
96 subl %ecx,%edx
97100: movb (%rsi),%al
98101: movb %al,(%rdi)
99 incq %rsi
100 incq %rdi
101 decl %ecx
102 jnz 100b
103102:
104 .section .fixup,"ax"
105103: addl %ecx,%edx /* ecx is zerorest also */
106 jmp copy_user_handle_tail
107 .previous
108
109 _ASM_EXTABLE(100b,103b)
110 _ASM_EXTABLE(101b,103b)
111 .endm
112
113#else
114# define _EXPAND_EXTABLE_HANDLE(x) #x
115# define _ASM_EXTABLE_HANDLE(from, to, handler) \
116 " .pushsection \"__ex_table\",\"a\"\n" \
117 " .balign 4\n" \
118 " .long (" #from ") - .\n" \
119 " .long (" #to ") - .\n" \
120 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
121 " .popsection\n"
122
123# define _ASM_EXTABLE(from, to) \
124 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
125
126# define _ASM_EXTABLE_FAULT(from, to) \
127 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
128
129# define _ASM_EXTABLE_EX(from, to) \
130 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
131
132# define _ASM_EXTABLE_REFCOUNT(from, to) \
133 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
134
135/* For C file, we already have NOKPROBE_SYMBOL macro */
136#endif
137
138#ifndef __ASSEMBLY__
139/*
140 * This output constraint should be used for any inline asm which has a "call"
141 * instruction. Otherwise the asm may be inserted before the frame pointer
142 * gets set up by the containing function. If you forget to do this, objtool
143 * may print a "call without frame pointer save/setup" warning.
144 */
145register unsigned long current_stack_pointer asm(_ASM_SP);
146#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
147#endif
148
149#endif /* _ASM_X86_ASM_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_ASM_H
3#define _ASM_X86_ASM_H
4
5#ifdef __ASSEMBLY__
6# define __ASM_FORM(x, ...) x,## __VA_ARGS__
7# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__
8# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__,
9#else
10#include <linux/stringify.h>
11# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " "
12# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__)
13# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) ","
14#endif
15
16#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;)
17
18#ifndef __x86_64__
19/* 32 bit */
20# define __ASM_SEL(a,b) __ASM_FORM(a)
21# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
22#else
23/* 64 bit */
24# define __ASM_SEL(a,b) __ASM_FORM(b)
25# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
26#endif
27
28#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
29 inst##q##__VA_ARGS__)
30#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
31
32#define _ASM_PTR __ASM_SEL(.long, .quad)
33#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
34
35#define _ASM_MOV __ASM_SIZE(mov)
36#define _ASM_INC __ASM_SIZE(inc)
37#define _ASM_DEC __ASM_SIZE(dec)
38#define _ASM_ADD __ASM_SIZE(add)
39#define _ASM_SUB __ASM_SIZE(sub)
40#define _ASM_XADD __ASM_SIZE(xadd)
41#define _ASM_MUL __ASM_SIZE(mul)
42
43#define _ASM_AX __ASM_REG(ax)
44#define _ASM_BX __ASM_REG(bx)
45#define _ASM_CX __ASM_REG(cx)
46#define _ASM_DX __ASM_REG(dx)
47#define _ASM_SP __ASM_REG(sp)
48#define _ASM_BP __ASM_REG(bp)
49#define _ASM_SI __ASM_REG(si)
50#define _ASM_DI __ASM_REG(di)
51
52#ifndef __x86_64__
53/* 32 bit */
54
55#define _ASM_ARG1 _ASM_AX
56#define _ASM_ARG2 _ASM_DX
57#define _ASM_ARG3 _ASM_CX
58
59#define _ASM_ARG1L eax
60#define _ASM_ARG2L edx
61#define _ASM_ARG3L ecx
62
63#define _ASM_ARG1W ax
64#define _ASM_ARG2W dx
65#define _ASM_ARG3W cx
66
67#define _ASM_ARG1B al
68#define _ASM_ARG2B dl
69#define _ASM_ARG3B cl
70
71#else
72/* 64 bit */
73
74#define _ASM_ARG1 _ASM_DI
75#define _ASM_ARG2 _ASM_SI
76#define _ASM_ARG3 _ASM_DX
77#define _ASM_ARG4 _ASM_CX
78#define _ASM_ARG5 r8
79#define _ASM_ARG6 r9
80
81#define _ASM_ARG1Q rdi
82#define _ASM_ARG2Q rsi
83#define _ASM_ARG3Q rdx
84#define _ASM_ARG4Q rcx
85#define _ASM_ARG5Q r8
86#define _ASM_ARG6Q r9
87
88#define _ASM_ARG1L edi
89#define _ASM_ARG2L esi
90#define _ASM_ARG3L edx
91#define _ASM_ARG4L ecx
92#define _ASM_ARG5L r8d
93#define _ASM_ARG6L r9d
94
95#define _ASM_ARG1W di
96#define _ASM_ARG2W si
97#define _ASM_ARG3W dx
98#define _ASM_ARG4W cx
99#define _ASM_ARG5W r8w
100#define _ASM_ARG6W r9w
101
102#define _ASM_ARG1B dil
103#define _ASM_ARG2B sil
104#define _ASM_ARG3B dl
105#define _ASM_ARG4B cl
106#define _ASM_ARG5B r8b
107#define _ASM_ARG6B r9b
108
109#endif
110
111/*
112 * Macros to generate condition code outputs from inline assembly,
113 * The output operand must be type "bool".
114 */
115#ifdef __GCC_ASM_FLAG_OUTPUTS__
116# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
117# define CC_OUT(c) "=@cc" #c
118#else
119# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
120# define CC_OUT(c) [_cc_ ## c] "=qm"
121#endif
122
123#ifdef __KERNEL__
124
125/* Exception table entry */
126#ifdef __ASSEMBLY__
127# define _ASM_EXTABLE_HANDLE(from, to, handler) \
128 .pushsection "__ex_table","a" ; \
129 .balign 4 ; \
130 .long (from) - . ; \
131 .long (to) - . ; \
132 .long (handler) - . ; \
133 .popsection
134
135# define _ASM_EXTABLE(from, to) \
136 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
137
138# define _ASM_EXTABLE_UA(from, to) \
139 _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
140
141# define _ASM_EXTABLE_CPY(from, to) \
142 _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
143
144# define _ASM_EXTABLE_FAULT(from, to) \
145 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
146
147# ifdef CONFIG_KPROBES
148# define _ASM_NOKPROBE(entry) \
149 .pushsection "_kprobe_blacklist","aw" ; \
150 _ASM_ALIGN ; \
151 _ASM_PTR (entry); \
152 .popsection
153# else
154# define _ASM_NOKPROBE(entry)
155# endif
156
157#else /* ! __ASSEMBLY__ */
158# define _EXPAND_EXTABLE_HANDLE(x) #x
159# define _ASM_EXTABLE_HANDLE(from, to, handler) \
160 " .pushsection \"__ex_table\",\"a\"\n" \
161 " .balign 4\n" \
162 " .long (" #from ") - .\n" \
163 " .long (" #to ") - .\n" \
164 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
165 " .popsection\n"
166
167# define _ASM_EXTABLE(from, to) \
168 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
169
170# define _ASM_EXTABLE_UA(from, to) \
171 _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
172
173# define _ASM_EXTABLE_CPY(from, to) \
174 _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
175
176# define _ASM_EXTABLE_FAULT(from, to) \
177 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
178
179/* For C file, we already have NOKPROBE_SYMBOL macro */
180
181/*
182 * This output constraint should be used for any inline asm which has a "call"
183 * instruction. Otherwise the asm may be inserted before the frame pointer
184 * gets set up by the containing function. If you forget to do this, objtool
185 * may print a "call without frame pointer save/setup" warning.
186 */
187register unsigned long current_stack_pointer asm(_ASM_SP);
188#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
189#endif /* __ASSEMBLY__ */
190
191#endif /* __KERNEL__ */
192
193#endif /* _ASM_X86_ASM_H */