summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/asm.h
blob: 990770f9e76b5a52af6f85692883a8507af00af6 (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_ASM_H
#define _ASM_X86_ASM_H

#ifdef __ASSEMBLY__
# define __ASM_FORM(x)	x
# define __ASM_FORM_RAW(x)     x
# define __ASM_FORM_COMMA(x) x,
#else
# define __ASM_FORM(x)	" " #x " "
# define __ASM_FORM_RAW(x)     #x
# define __ASM_FORM_COMMA(x) " " #x ","
#endif

#ifndef __x86_64__
/* 32 bit */
# define __ASM_SEL(a,b) __ASM_FORM(a)
# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
#else
/* 64 bit */
# define __ASM_SEL(a,b) __ASM_FORM(b)
# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
#endif

#define __ASM_SIZE(inst, ...)	__ASM_SEL(inst##l##__VA_ARGS__, \
					  inst##q##__VA_ARGS__)
#define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)

#define _ASM_PTR	__ASM_SEL(.long, .quad)
#define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)

#define _ASM_MOV	__ASM_SIZE(mov)
#define _ASM_INC	__ASM_SIZE(inc)
#define _ASM_DEC	__ASM_SIZE(dec)
#define _ASM_ADD	__ASM_SIZE(add)
#define _ASM_SUB	__ASM_SIZE(sub)
#define _ASM_XADD	__ASM_SIZE(xadd)
#define _ASM_MUL	__ASM_SIZE(mul)

#define _ASM_AX		__ASM_REG(ax)
#define _ASM_BX		__ASM_REG(bx)
#define _ASM_CX		__ASM_REG(cx)
#define _ASM_DX		__ASM_REG(dx)
#define _ASM_SP		__ASM_REG(sp)
#define _ASM_BP		__ASM_REG(bp)
#define _ASM_SI		__ASM_REG(si)
#define _ASM_DI		__ASM_REG(di)

#ifndef __x86_64__
/* 32 bit */

#define _ASM_ARG1	_ASM_AX
#define _ASM_ARG2	_ASM_DX
#define _ASM_ARG3	_ASM_CX

#define _ASM_ARG1L	eax
#define _ASM_ARG2L	edx
#define _ASM_ARG3L	ecx

#define _ASM_ARG1W	ax
#define _ASM_ARG2W	dx
#define _ASM_ARG3W	cx

#define _ASM_ARG1B	al
#define _ASM_ARG2B	dl
#define _ASM_ARG3B	cl

#else
/* 64 bit */

#define _ASM_ARG1	_ASM_DI
#define _ASM_ARG2	_ASM_SI
#define _ASM_ARG3	_ASM_DX
#define _ASM_ARG4	_ASM_CX
#define _ASM_ARG5	r8
#define _ASM_ARG6	r9

#define _ASM_ARG1Q	rdi
#define _ASM_ARG2Q	rsi
#define _ASM_ARG3Q	rdx
#define _ASM_ARG4Q	rcx
#define _ASM_ARG5Q	r8
#define _ASM_ARG6Q	r9

#define _ASM_ARG1L	edi
#define _ASM_ARG2L	esi
#define _ASM_ARG3L	edx
#define _ASM_ARG4L	ecx
#define _ASM_ARG5L	r8d
#define _ASM_ARG6L	r9d

#define _ASM_ARG1W	di
#define _ASM_ARG2W	si
#define _ASM_ARG3W	dx
#define _ASM_ARG4W	cx
#define _ASM_ARG5W	r8w
#define _ASM_ARG6W	r9w

#define _ASM_ARG1B	dil
#define _ASM_ARG2B	sil
#define _ASM_ARG3B	dl
#define _ASM_ARG4B	cl
#define _ASM_ARG5B	r8b
#define _ASM_ARG6B	r9b

#endif

/*
 * Macros to generate condition code outputs from inline assembly,
 * The output operand must be type "bool".
 */
#ifdef __GCC_ASM_FLAG_OUTPUTS__
# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
# define CC_OUT(c) "=@cc" #c
#else
# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
# define CC_OUT(c) [_cc_ ## c] "=qm"
#endif

/* Exception table entry */
#ifdef __ASSEMBLY__
# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
	.pushsection "__ex_table","a" ;				\
	.balign 4 ;						\
	.long (from) - . ;					\
	.long (to) - . ;					\
	.long (handler) - . ;					\
	.popsection

# define _ASM_EXTABLE(from, to)					\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)

# define _ASM_EXTABLE_FAULT(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)

# define _ASM_EXTABLE_EX(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)

# define _ASM_EXTABLE_REFCOUNT(from, to)			\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)

# define _ASM_NOKPROBE(entry)					\
	.pushsection "_kprobe_blacklist","aw" ;			\
	_ASM_ALIGN ;						\
	_ASM_PTR (entry);					\
	.popsection

.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

#else
# define _EXPAND_EXTABLE_HANDLE(x) #x
# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
	" .pushsection \"__ex_table\",\"a\"\n"			\
	" .balign 4\n"						\
	" .long (" #from ") - .\n"				\
	" .long (" #to ") - .\n"				\
	" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"	\
	" .popsection\n"

# define _ASM_EXTABLE(from, to)					\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)

# define _ASM_EXTABLE_FAULT(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)

# define _ASM_EXTABLE_EX(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)

# define _ASM_EXTABLE_REFCOUNT(from, to)			\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)

/* For C file, we already have NOKPROBE_SYMBOL macro */
#endif

#ifndef __ASSEMBLY__
/*
 * This output constraint should be used for any inline asm which has a "call"
 * instruction.  Otherwise the asm may be inserted before the frame pointer
 * gets set up by the containing function.  If you forget to do this, objtool
 * may print a "call without frame pointer save/setup" warning.
 */
register unsigned long current_stack_pointer asm(_ASM_SP);
#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
#endif

#endif /* _ASM_X86_ASM_H */