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
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