Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/*
50 * Macros to generate condition code outputs from inline assembly,
51 * The output operand must be type "bool".
52 */
53#ifdef __GCC_ASM_FLAG_OUTPUTS__
54# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
55# define CC_OUT(c) "=@cc" #c
56#else
57# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
58# define CC_OUT(c) [_cc_ ## c] "=qm"
59#endif
60
61/* Exception table entry */
62#ifdef __ASSEMBLY__
63# define _ASM_EXTABLE_HANDLE(from, to, handler) \
64 .pushsection "__ex_table","a" ; \
65 .balign 4 ; \
66 .long (from) - . ; \
67 .long (to) - . ; \
68 .long (handler) - . ; \
69 .popsection
70
71# define _ASM_EXTABLE(from, to) \
72 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
73
74# define _ASM_EXTABLE_FAULT(from, to) \
75 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
76
77# define _ASM_EXTABLE_EX(from, to) \
78 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
79
80# define _ASM_EXTABLE_REFCOUNT(from, to) \
81 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
82
83# define _ASM_NOKPROBE(entry) \
84 .pushsection "_kprobe_blacklist","aw" ; \
85 _ASM_ALIGN ; \
86 _ASM_PTR (entry); \
87 .popsection
88
89.macro ALIGN_DESTINATION
90 /* check for bad alignment of destination */
91 movl %edi,%ecx
92 andl $7,%ecx
93 jz 102f /* already aligned */
94 subl $8,%ecx
95 negl %ecx
96 subl %ecx,%edx
97100: movb (%rsi),%al
98101: movb %al,(%rdi)
99 incq %rsi
100 incq %rdi
101 decl %ecx
102 jnz 100b
103102:
104 .section .fixup,"ax"
105103: addl %ecx,%edx /* ecx is zerorest also */
106 jmp copy_user_handle_tail
107 .previous
108
109 _ASM_EXTABLE(100b,103b)
110 _ASM_EXTABLE(101b,103b)
111 .endm
112
113#else
114# define _EXPAND_EXTABLE_HANDLE(x) #x
115# define _ASM_EXTABLE_HANDLE(from, to, handler) \
116 " .pushsection \"__ex_table\",\"a\"\n" \
117 " .balign 4\n" \
118 " .long (" #from ") - .\n" \
119 " .long (" #to ") - .\n" \
120 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
121 " .popsection\n"
122
123# define _ASM_EXTABLE(from, to) \
124 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
125
126# define _ASM_EXTABLE_FAULT(from, to) \
127 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
128
129# define _ASM_EXTABLE_EX(from, to) \
130 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
131
132# define _ASM_EXTABLE_REFCOUNT(from, to) \
133 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
134
135/* For C file, we already have NOKPROBE_SYMBOL macro */
136#endif
137
138#ifndef __ASSEMBLY__
139#ifndef __BPF__
140/*
141 * This output constraint should be used for any inline asm which has a "call"
142 * instruction. Otherwise the asm may be inserted before the frame pointer
143 * gets set up by the containing function. If you forget to do this, objtool
144 * may print a "call without frame pointer save/setup" warning.
145 */
146register unsigned long current_stack_pointer asm(_ASM_SP);
147#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
148#endif
149#endif
150
151#endif /* _ASM_X86_ASM_H */