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
159100: movb (%rsi),%al
160101: movb %al,(%rdi)
161 incq %rsi
162 incq %rdi
163 decl %ecx
164 jnz 100b
165102:
166 .section .fixup,"ax"
167103: 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 */
210register 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