Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_ASM_H
3#define _ASM_X86_ASM_H
4
5#include <linux/annotate.h>
6
7#ifdef __ASSEMBLER__
8# define __ASM_FORM(x, ...) x,## __VA_ARGS__
9# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__
10# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__,
11# define __ASM_REGPFX %
12#else
13#include <linux/stringify.h>
14# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " "
15# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__)
16# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) ","
17# define __ASM_REGPFX %%
18#endif
19
20#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;)
21
22#ifndef __x86_64__
23/* 32 bit */
24# define __ASM_SEL(a,b) __ASM_FORM(a)
25# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
26#else
27/* 64 bit */
28# define __ASM_SEL(a,b) __ASM_FORM(b)
29# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
30#endif
31
32#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
33 inst##q##__VA_ARGS__)
34#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
35
36#define _ASM_PTR __ASM_SEL(.long, .quad)
37#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
38
39#define _ASM_MOV __ASM_SIZE(mov)
40#define _ASM_INC __ASM_SIZE(inc)
41#define _ASM_DEC __ASM_SIZE(dec)
42#define _ASM_ADD __ASM_SIZE(add)
43#define _ASM_SUB __ASM_SIZE(sub)
44#define _ASM_XADD __ASM_SIZE(xadd)
45#define _ASM_MUL __ASM_SIZE(mul)
46
47#define _ASM_AX __ASM_REG(ax)
48#define _ASM_BX __ASM_REG(bx)
49#define _ASM_CX __ASM_REG(cx)
50#define _ASM_DX __ASM_REG(dx)
51#define _ASM_SP __ASM_REG(sp)
52#define _ASM_BP __ASM_REG(bp)
53#define _ASM_SI __ASM_REG(si)
54#define _ASM_DI __ASM_REG(di)
55
56/* Adds a (%rip) suffix on 64 bits only; for immediate memory references */
57#define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip))
58
59#ifndef __x86_64__
60/* 32 bit */
61
62#define _ASM_ARG1 _ASM_AX
63#define _ASM_ARG2 _ASM_DX
64#define _ASM_ARG3 _ASM_CX
65
66#define _ASM_ARG1L eax
67#define _ASM_ARG2L edx
68#define _ASM_ARG3L ecx
69
70#define _ASM_ARG1W ax
71#define _ASM_ARG2W dx
72#define _ASM_ARG3W cx
73
74#define _ASM_ARG1B al
75#define _ASM_ARG2B dl
76#define _ASM_ARG3B cl
77
78#else
79/* 64 bit */
80
81#define _ASM_ARG1 _ASM_DI
82#define _ASM_ARG2 _ASM_SI
83#define _ASM_ARG3 _ASM_DX
84#define _ASM_ARG4 _ASM_CX
85#define _ASM_ARG5 r8
86#define _ASM_ARG6 r9
87
88#define _ASM_ARG1Q rdi
89#define _ASM_ARG2Q rsi
90#define _ASM_ARG3Q rdx
91#define _ASM_ARG4Q rcx
92#define _ASM_ARG5Q r8
93#define _ASM_ARG6Q r9
94
95#define _ASM_ARG1L edi
96#define _ASM_ARG2L esi
97#define _ASM_ARG3L edx
98#define _ASM_ARG4L ecx
99#define _ASM_ARG5L r8d
100#define _ASM_ARG6L r9d
101
102#define _ASM_ARG1W di
103#define _ASM_ARG2W si
104#define _ASM_ARG3W dx
105#define _ASM_ARG4W cx
106#define _ASM_ARG5W r8w
107#define _ASM_ARG6W r9w
108
109#define _ASM_ARG1B dil
110#define _ASM_ARG2B sil
111#define _ASM_ARG3B dl
112#define _ASM_ARG4B cl
113#define _ASM_ARG5B r8b
114#define _ASM_ARG6B r9b
115
116#endif
117
118#ifndef __ASSEMBLER__
119static __always_inline __pure void *rip_rel_ptr(void *p)
120{
121 asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p));
122
123 return p;
124}
125#endif
126
127#ifdef __KERNEL__
128
129#ifndef COMPILE_OFFSETS
130#include <asm/asm-offsets.h>
131#endif
132
133# include <asm/extable_fixup_types.h>
134
135/* Exception table entry */
136#ifdef __ASSEMBLER__
137
138# define _ASM_EXTABLE_TYPE(from, to, type) \
139 .pushsection "__ex_table", "aM", @progbits, EXTABLE_SIZE ; \
140 .balign 4 ; \
141 .long (from) - . ; \
142 .long (to) - . ; \
143 .long type ; \
144 .popsection
145
146# ifdef CONFIG_KPROBES
147# define _ASM_NOKPROBE(entry) \
148 .pushsection "_kprobe_blacklist","aw" ; \
149 _ASM_ALIGN ; \
150 _ASM_PTR (entry); \
151 .popsection
152# else
153# define _ASM_NOKPROBE(entry)
154# endif
155
156#else /* ! __ASSEMBLER__ */
157
158# define DEFINE_EXTABLE_TYPE_REG \
159 ".macro extable_type_reg type:req reg:req\n" \
160 ".set .Lfound, 0\n" \
161 ".set .Lregnr, 0\n" \
162 ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
163 ".ifc \\reg, %%\\rs\n" \
164 ".set .Lfound, .Lfound+1\n" \
165 ".long \\type + (.Lregnr << 8)\n" \
166 ".endif\n" \
167 ".set .Lregnr, .Lregnr+1\n" \
168 ".endr\n" \
169 ".set .Lregnr, 0\n" \
170 ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
171 ".ifc \\reg, %%\\rs\n" \
172 ".set .Lfound, .Lfound+1\n" \
173 ".long \\type + (.Lregnr << 8)\n" \
174 ".endif\n" \
175 ".set .Lregnr, .Lregnr+1\n" \
176 ".endr\n" \
177 ".if (.Lfound != 1)\n" \
178 ".error \"extable_type_reg: bad register argument\"\n" \
179 ".endif\n" \
180 ".endm\n"
181
182# define UNDEFINE_EXTABLE_TYPE_REG \
183 ".purgem extable_type_reg\n"
184
185# define _ASM_EXTABLE_TYPE(from, to, type) \
186 " .pushsection __ex_table, \"aM\", @progbits, " \
187 __stringify(EXTABLE_SIZE) "\n" \
188 " .balign 4\n" \
189 " .long (" #from ") - .\n" \
190 " .long (" #to ") - .\n" \
191 " .long " __stringify(type) " \n" \
192 " .popsection\n"
193
194# define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \
195 " .pushsection __ex_table, \"aM\", @progbits, " \
196 __stringify(EXTABLE_SIZE) "\n" \
197 " .balign 4\n" \
198 " .long (" #from ") - .\n" \
199 " .long (" #to ") - .\n" \
200 DEFINE_EXTABLE_TYPE_REG \
201 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
202 UNDEFINE_EXTABLE_TYPE_REG \
203 " .popsection\n"
204
205/* For C file, we already have NOKPROBE_SYMBOL macro */
206
207/* Insert a comma if args are non-empty */
208#define COMMA(x...) __COMMA(x)
209#define __COMMA(...) , ##__VA_ARGS__
210
211/*
212 * Combine multiple asm inline constraint args into a single arg for passing to
213 * another macro.
214 */
215#define ASM_OUTPUT(x...) x
216#define ASM_INPUT(x...) x
217
218/*
219 * This output constraint should be used for any inline asm which has a "call"
220 * instruction. Otherwise the asm may be inserted before the frame pointer
221 * gets set up by the containing function. If you forget to do this, objtool
222 * may print a "call without frame pointer save/setup" warning.
223 */
224register unsigned long current_stack_pointer asm(_ASM_SP);
225#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
226#endif /* __ASSEMBLER__ */
227
228#define _ASM_EXTABLE(from, to) \
229 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
230
231#define _ASM_EXTABLE_UA(from, to) \
232 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
233
234#define _ASM_EXTABLE_FAULT(from, to) \
235 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
236
237/*
238 * Both i386 and x86_64 returns 64-bit values in edx:eax for certain
239 * instructions, but GCC's "A" constraint has different meanings.
240 * For i386, "A" means exactly edx:eax, while for x86_64 it
241 * means rax *or* rdx.
242 *
243 * These helpers wrapping these semantic differences save one instruction
244 * clearing the high half of 'low':
245 */
246#ifdef CONFIG_X86_64
247# define EAX_EDX_DECLARE_ARGS(val, low, high) unsigned long low, high
248# define EAX_EDX_VAL(val, low, high) ((low) | (high) << 32)
249# define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high)
250#else
251# define EAX_EDX_DECLARE_ARGS(val, low, high) u64 val
252# define EAX_EDX_VAL(val, low, high) (val)
253# define EAX_EDX_RET(val, low, high) "=A" (val)
254#endif
255
256#endif /* __KERNEL__ */
257#endif /* _ASM_X86_ASM_H */