Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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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#ifdef __ASSEMBLER__
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 __ASSEMBLER__
117static __always_inline __pure void *rip_rel_ptr(void *p)
118{
119 asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p));
120
121 return p;
122}
123#endif
124
125/*
126 * Macros to generate condition code outputs from inline assembly,
127 * The output operand must be type "bool".
128 */
129#ifdef __GCC_ASM_FLAG_OUTPUTS__
130# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
131# define CC_OUT(c) "=@cc" #c
132#else
133# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
134# define CC_OUT(c) [_cc_ ## c] "=qm"
135#endif
136
137#ifdef __KERNEL__
138
139# include <asm/extable_fixup_types.h>
140
141/* Exception table entry */
142#ifdef __ASSEMBLER__
143
144# define _ASM_EXTABLE_TYPE(from, to, type) \
145 .pushsection "__ex_table","a" ; \
146 .balign 4 ; \
147 .long (from) - . ; \
148 .long (to) - . ; \
149 .long type ; \
150 .popsection
151
152# ifdef CONFIG_KPROBES
153# define _ASM_NOKPROBE(entry) \
154 .pushsection "_kprobe_blacklist","aw" ; \
155 _ASM_ALIGN ; \
156 _ASM_PTR (entry); \
157 .popsection
158# else
159# define _ASM_NOKPROBE(entry)
160# endif
161
162#else /* ! __ASSEMBLER__ */
163
164# define DEFINE_EXTABLE_TYPE_REG \
165 ".macro extable_type_reg type:req reg:req\n" \
166 ".set .Lfound, 0\n" \
167 ".set .Lregnr, 0\n" \
168 ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
169 ".ifc \\reg, %%\\rs\n" \
170 ".set .Lfound, .Lfound+1\n" \
171 ".long \\type + (.Lregnr << 8)\n" \
172 ".endif\n" \
173 ".set .Lregnr, .Lregnr+1\n" \
174 ".endr\n" \
175 ".set .Lregnr, 0\n" \
176 ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
177 ".ifc \\reg, %%\\rs\n" \
178 ".set .Lfound, .Lfound+1\n" \
179 ".long \\type + (.Lregnr << 8)\n" \
180 ".endif\n" \
181 ".set .Lregnr, .Lregnr+1\n" \
182 ".endr\n" \
183 ".if (.Lfound != 1)\n" \
184 ".error \"extable_type_reg: bad register argument\"\n" \
185 ".endif\n" \
186 ".endm\n"
187
188# define UNDEFINE_EXTABLE_TYPE_REG \
189 ".purgem extable_type_reg\n"
190
191# define _ASM_EXTABLE_TYPE(from, to, type) \
192 " .pushsection \"__ex_table\",\"a\"\n" \
193 " .balign 4\n" \
194 " .long (" #from ") - .\n" \
195 " .long (" #to ") - .\n" \
196 " .long " __stringify(type) " \n" \
197 " .popsection\n"
198
199# define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \
200 " .pushsection \"__ex_table\",\"a\"\n" \
201 " .balign 4\n" \
202 " .long (" #from ") - .\n" \
203 " .long (" #to ") - .\n" \
204 DEFINE_EXTABLE_TYPE_REG \
205 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
206 UNDEFINE_EXTABLE_TYPE_REG \
207 " .popsection\n"
208
209/* For C file, we already have NOKPROBE_SYMBOL macro */
210
211/* Insert a comma if args are non-empty */
212#define COMMA(x...) __COMMA(x)
213#define __COMMA(...) , ##__VA_ARGS__
214
215/*
216 * Combine multiple asm inline constraint args into a single arg for passing to
217 * another macro.
218 */
219#define ASM_OUTPUT(x...) x
220#define ASM_INPUT(x...) x
221
222/*
223 * This output constraint should be used for any inline asm which has a "call"
224 * instruction. Otherwise the asm may be inserted before the frame pointer
225 * gets set up by the containing function. If you forget to do this, objtool
226 * may print a "call without frame pointer save/setup" warning.
227 */
228register unsigned long current_stack_pointer asm(_ASM_SP);
229#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
230#endif /* __ASSEMBLER__ */
231
232#define _ASM_EXTABLE(from, to) \
233 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
234
235#define _ASM_EXTABLE_UA(from, to) \
236 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
237
238#define _ASM_EXTABLE_FAULT(from, to) \
239 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
240
241/*
242 * Both i386 and x86_64 returns 64-bit values in edx:eax for certain
243 * instructions, but GCC's "A" constraint has different meanings.
244 * For i386, "A" means exactly edx:eax, while for x86_64 it
245 * means rax *or* rdx.
246 *
247 * These helpers wrapping these semantic differences save one instruction
248 * clearing the high half of 'low':
249 */
250#ifdef CONFIG_X86_64
251# define EAX_EDX_DECLARE_ARGS(val, low, high) unsigned long low, high
252# define EAX_EDX_VAL(val, low, high) ((low) | (high) << 32)
253# define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high)
254#else
255# define EAX_EDX_DECLARE_ARGS(val, low, high) u64 val
256# define EAX_EDX_VAL(val, low, high) (val)
257# define EAX_EDX_RET(val, low, high) "=A" (val)
258#endif
259
260#endif /* __KERNEL__ */
261#endif /* _ASM_X86_ASM_H */