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 # define __ASM_REGPFX %
10 #else
11 #include <linux/stringify.h>
12 # define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " "
13 # define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__)
14 # define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) ","
15 # define __ASM_REGPFX %%
16 #endif
17
18 #define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;)
19
20 #ifndef __x86_64__
21 /* 32 bit */
22 # define __ASM_SEL(a,b) __ASM_FORM(a)
23 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
24 #else
25 /* 64 bit */
26 # define __ASM_SEL(a,b) __ASM_FORM(b)
27 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
28 #endif
29
30 #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
31 inst##q##__VA_ARGS__)
32 #define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
33
34 #define _ASM_PTR __ASM_SEL(.long, .quad)
35 #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
36
37 #define _ASM_MOV __ASM_SIZE(mov)
38 #define _ASM_INC __ASM_SIZE(inc)
39 #define _ASM_DEC __ASM_SIZE(dec)
40 #define _ASM_ADD __ASM_SIZE(add)
41 #define _ASM_SUB __ASM_SIZE(sub)
42 #define _ASM_XADD __ASM_SIZE(xadd)
43 #define _ASM_MUL __ASM_SIZE(mul)
44
45 #define _ASM_AX __ASM_REG(ax)
46 #define _ASM_BX __ASM_REG(bx)
47 #define _ASM_CX __ASM_REG(cx)
48 #define _ASM_DX __ASM_REG(dx)
49 #define _ASM_SP __ASM_REG(sp)
50 #define _ASM_BP __ASM_REG(bp)
51 #define _ASM_SI __ASM_REG(si)
52 #define _ASM_DI __ASM_REG(di)
53
54 /* Adds a (%rip) suffix on 64 bits only; for immediate memory references */
55 #define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip))
56
57 #ifndef __x86_64__
58 /* 32 bit */
59
60 #define _ASM_ARG1 _ASM_AX
61 #define _ASM_ARG2 _ASM_DX
62 #define _ASM_ARG3 _ASM_CX
63
64 #define _ASM_ARG1L eax
65 #define _ASM_ARG2L edx
66 #define _ASM_ARG3L ecx
67
68 #define _ASM_ARG1W ax
69 #define _ASM_ARG2W dx
70 #define _ASM_ARG3W cx
71
72 #define _ASM_ARG1B al
73 #define _ASM_ARG2B dl
74 #define _ASM_ARG3B cl
75
76 #else
77 /* 64 bit */
78
79 #define _ASM_ARG1 _ASM_DI
80 #define _ASM_ARG2 _ASM_SI
81 #define _ASM_ARG3 _ASM_DX
82 #define _ASM_ARG4 _ASM_CX
83 #define _ASM_ARG5 r8
84 #define _ASM_ARG6 r9
85
86 #define _ASM_ARG1Q rdi
87 #define _ASM_ARG2Q rsi
88 #define _ASM_ARG3Q rdx
89 #define _ASM_ARG4Q rcx
90 #define _ASM_ARG5Q r8
91 #define _ASM_ARG6Q r9
92
93 #define _ASM_ARG1L edi
94 #define _ASM_ARG2L esi
95 #define _ASM_ARG3L edx
96 #define _ASM_ARG4L ecx
97 #define _ASM_ARG5L r8d
98 #define _ASM_ARG6L r9d
99
100 #define _ASM_ARG1W di
101 #define _ASM_ARG2W si
102 #define _ASM_ARG3W dx
103 #define _ASM_ARG4W cx
104 #define _ASM_ARG5W r8w
105 #define _ASM_ARG6W r9w
106
107 #define _ASM_ARG1B dil
108 #define _ASM_ARG2B sil
109 #define _ASM_ARG3B dl
110 #define _ASM_ARG4B cl
111 #define _ASM_ARG5B r8b
112 #define _ASM_ARG6B r9b
113
114 #endif
115
116 #ifndef __ASSEMBLY__
117 #ifndef __pic__
rip_rel_ptr(void * p)118 static __always_inline __pure void *rip_rel_ptr(void *p)
119 {
120 asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p));
121
122 return p;
123 }
124 #define RIP_REL_REF(var) (*(typeof(&(var)))rip_rel_ptr(&(var)))
125 #else
126 #define RIP_REL_REF(var) (var)
127 #endif
128 #endif
129
130 /*
131 * Macros to generate condition code outputs from inline assembly,
132 * The output operand must be type "bool".
133 */
134 #ifdef __GCC_ASM_FLAG_OUTPUTS__
135 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
136 # define CC_OUT(c) "=@cc" #c
137 #else
138 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
139 # define CC_OUT(c) [_cc_ ## c] "=qm"
140 #endif
141
142 #ifdef __KERNEL__
143
144 # include <asm/extable_fixup_types.h>
145
146 /* Exception table entry */
147 #ifdef __ASSEMBLY__
148
149 # define _ASM_EXTABLE_TYPE(from, to, type) \
150 .pushsection "__ex_table","a" ; \
151 .balign 4 ; \
152 .long (from) - . ; \
153 .long (to) - . ; \
154 .long type ; \
155 .popsection
156
157 # ifdef CONFIG_KPROBES
158 # define _ASM_NOKPROBE(entry) \
159 .pushsection "_kprobe_blacklist","aw" ; \
160 _ASM_ALIGN ; \
161 _ASM_PTR (entry); \
162 .popsection
163 # else
164 # define _ASM_NOKPROBE(entry)
165 # endif
166
167 #else /* ! __ASSEMBLY__ */
168
169 # define DEFINE_EXTABLE_TYPE_REG \
170 ".macro extable_type_reg type:req reg:req\n" \
171 ".set .Lfound, 0\n" \
172 ".set .Lregnr, 0\n" \
173 ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
174 ".ifc \\reg, %%\\rs\n" \
175 ".set .Lfound, .Lfound+1\n" \
176 ".long \\type + (.Lregnr << 8)\n" \
177 ".endif\n" \
178 ".set .Lregnr, .Lregnr+1\n" \
179 ".endr\n" \
180 ".set .Lregnr, 0\n" \
181 ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
182 ".ifc \\reg, %%\\rs\n" \
183 ".set .Lfound, .Lfound+1\n" \
184 ".long \\type + (.Lregnr << 8)\n" \
185 ".endif\n" \
186 ".set .Lregnr, .Lregnr+1\n" \
187 ".endr\n" \
188 ".if (.Lfound != 1)\n" \
189 ".error \"extable_type_reg: bad register argument\"\n" \
190 ".endif\n" \
191 ".endm\n"
192
193 # define UNDEFINE_EXTABLE_TYPE_REG \
194 ".purgem extable_type_reg\n"
195
196 # define _ASM_EXTABLE_TYPE(from, to, type) \
197 " .pushsection \"__ex_table\",\"a\"\n" \
198 " .balign 4\n" \
199 " .long (" #from ") - .\n" \
200 " .long (" #to ") - .\n" \
201 " .long " __stringify(type) " \n" \
202 " .popsection\n"
203
204 # define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \
205 " .pushsection \"__ex_table\",\"a\"\n" \
206 " .balign 4\n" \
207 " .long (" #from ") - .\n" \
208 " .long (" #to ") - .\n" \
209 DEFINE_EXTABLE_TYPE_REG \
210 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
211 UNDEFINE_EXTABLE_TYPE_REG \
212 " .popsection\n"
213
214 /* For C file, we already have NOKPROBE_SYMBOL macro */
215
216 /*
217 * This output constraint should be used for any inline asm which has a "call"
218 * instruction. Otherwise the asm may be inserted before the frame pointer
219 * gets set up by the containing function. If you forget to do this, objtool
220 * may print a "call without frame pointer save/setup" warning.
221 */
222 register unsigned long current_stack_pointer asm(_ASM_SP);
223 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
224 #endif /* __ASSEMBLY__ */
225
226 #define _ASM_EXTABLE(from, to) \
227 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
228
229 #define _ASM_EXTABLE_UA(from, to) \
230 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
231
232 #define _ASM_EXTABLE_CPY(from, to) \
233 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_COPY)
234
235 #define _ASM_EXTABLE_FAULT(from, to) \
236 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
237
238 #endif /* __KERNEL__ */
239 #endif /* _ASM_X86_ASM_H */
240