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  */
187 register 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 */
194