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 | #ifndef __x86_64__ |
50 | /* 32 bit */ |
51 | |
52 | #define _ASM_ARG1 _ASM_AX |
53 | #define _ASM_ARG2 _ASM_DX |
54 | #define _ASM_ARG3 _ASM_CX |
55 | |
56 | #define _ASM_ARG1L eax |
57 | #define _ASM_ARG2L edx |
58 | #define _ASM_ARG3L ecx |
59 | |
60 | #define _ASM_ARG1W ax |
61 | #define _ASM_ARG2W dx |
62 | #define _ASM_ARG3W cx |
63 | |
64 | #define _ASM_ARG1B al |
65 | #define _ASM_ARG2B dl |
66 | #define _ASM_ARG3B cl |
67 | |
68 | #else |
69 | /* 64 bit */ |
70 | |
71 | #define _ASM_ARG1 _ASM_DI |
72 | #define _ASM_ARG2 _ASM_SI |
73 | #define _ASM_ARG3 _ASM_DX |
74 | #define _ASM_ARG4 _ASM_CX |
75 | #define _ASM_ARG5 r8 |
76 | #define _ASM_ARG6 r9 |
77 | |
78 | #define _ASM_ARG1Q rdi |
79 | #define _ASM_ARG2Q rsi |
80 | #define _ASM_ARG3Q rdx |
81 | #define _ASM_ARG4Q rcx |
82 | #define _ASM_ARG5Q r8 |
83 | #define _ASM_ARG6Q r9 |
84 | |
85 | #define _ASM_ARG1L edi |
86 | #define _ASM_ARG2L esi |
87 | #define _ASM_ARG3L edx |
88 | #define _ASM_ARG4L ecx |
89 | #define _ASM_ARG5L r8d |
90 | #define _ASM_ARG6L r9d |
91 | |
92 | #define _ASM_ARG1W di |
93 | #define _ASM_ARG2W si |
94 | #define _ASM_ARG3W dx |
95 | #define _ASM_ARG4W cx |
96 | #define _ASM_ARG5W r8w |
97 | #define _ASM_ARG6W r9w |
98 | |
99 | #define _ASM_ARG1B dil |
100 | #define _ASM_ARG2B sil |
101 | #define _ASM_ARG3B dl |
102 | #define _ASM_ARG4B cl |
103 | #define _ASM_ARG5B r8b |
104 | #define _ASM_ARG6B r9b |
105 | |
106 | #endif |
107 | |
108 | /* |
109 | * Macros to generate condition code outputs from inline assembly, |
110 | * The output operand must be type "bool". |
111 | */ |
112 | #ifdef __GCC_ASM_FLAG_OUTPUTS__ |
113 | # define CC_SET(c) "\n\t/* output condition code " #c "*/\n" |
114 | # define CC_OUT(c) "=@cc" #c |
115 | #else |
116 | # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" |
117 | # define CC_OUT(c) [_cc_ ## c] "=qm" |
118 | #endif |
119 | |
120 | /* Exception table entry */ |
121 | #ifdef __ASSEMBLY__ |
122 | # define _ASM_EXTABLE_HANDLE(from, to, handler) \ |
123 | .pushsection "__ex_table","a" ; \ |
124 | .balign 4 ; \ |
125 | .long (from) - . ; \ |
126 | .long (to) - . ; \ |
127 | .long (handler) - . ; \ |
128 | .popsection |
129 | |
130 | # define _ASM_EXTABLE(from, to) \ |
131 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) |
132 | |
133 | # define _ASM_EXTABLE_UA(from, to) \ |
134 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) |
135 | |
136 | # define _ASM_EXTABLE_FAULT(from, to) \ |
137 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) |
138 | |
139 | # define _ASM_EXTABLE_EX(from, to) \ |
140 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) |
141 | |
142 | # define _ASM_EXTABLE_REFCOUNT(from, to) \ |
143 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) |
144 | |
145 | # define _ASM_NOKPROBE(entry) \ |
146 | .pushsection "_kprobe_blacklist","aw" ; \ |
147 | _ASM_ALIGN ; \ |
148 | _ASM_PTR (entry); \ |
149 | .popsection |
150 | |
151 | .macro ALIGN_DESTINATION |
152 | /* check for bad alignment of destination */ |
153 | movl %edi,%ecx |
154 | andl $7,%ecx |
155 | jz 102f /* already aligned */ |
156 | subl $8,%ecx |
157 | negl %ecx |
158 | subl %ecx,%edx |
159 | 100: movb (%rsi),%al |
160 | 101: movb %al,(%rdi) |
161 | incq %rsi |
162 | incq %rdi |
163 | decl %ecx |
164 | jnz 100b |
165 | 102: |
166 | .section .fixup,"ax" |
167 | 103: addl %ecx,%edx /* ecx is zerorest also */ |
168 | jmp copy_user_handle_tail |
169 | .previous |
170 | |
171 | _ASM_EXTABLE_UA(100b, 103b) |
172 | _ASM_EXTABLE_UA(101b, 103b) |
173 | .endm |
174 | |
175 | #else |
176 | # define _EXPAND_EXTABLE_HANDLE(x) #x |
177 | # define _ASM_EXTABLE_HANDLE(from, to, handler) \ |
178 | " .pushsection \"__ex_table\",\"a\"\n" \ |
179 | " .balign 4\n" \ |
180 | " .long (" #from ") - .\n" \ |
181 | " .long (" #to ") - .\n" \ |
182 | " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ |
183 | " .popsection\n" |
184 | |
185 | # define _ASM_EXTABLE(from, to) \ |
186 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) |
187 | |
188 | # define _ASM_EXTABLE_UA(from, to) \ |
189 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) |
190 | |
191 | # define _ASM_EXTABLE_FAULT(from, to) \ |
192 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) |
193 | |
194 | # define _ASM_EXTABLE_EX(from, to) \ |
195 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) |
196 | |
197 | # define _ASM_EXTABLE_REFCOUNT(from, to) \ |
198 | _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) |
199 | |
200 | /* For C file, we already have NOKPROBE_SYMBOL macro */ |
201 | #endif |
202 | |
203 | #ifndef __ASSEMBLY__ |
204 | /* |
205 | * This output constraint should be used for any inline asm which has a "call" |
206 | * instruction. Otherwise the asm may be inserted before the frame pointer |
207 | * gets set up by the containing function. If you forget to do this, objtool |
208 | * may print a "call without frame pointer save/setup" warning. |
209 | */ |
210 | register unsigned long current_stack_pointer asm(_ASM_SP); |
211 | #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) |
212 | #endif |
213 | |
214 | #endif /* _ASM_X86_ASM_H */ |
215 | |