Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _ASM_X86_ASM_H
2#define _ASM_X86_ASM_H
3
4#ifdef __ASSEMBLY__
5# define __ASM_FORM(x) x
6# define __ASM_FORM_RAW(x) x
7# define __ASM_FORM_COMMA(x) x,
8#else
9# define __ASM_FORM(x) " " #x " "
10# define __ASM_FORM_RAW(x) #x
11# define __ASM_FORM_COMMA(x) " " #x ","
12#endif
13
14#ifdef CONFIG_X86_32
15# define __ASM_SEL(a,b) __ASM_FORM(a)
16# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
17#else
18# define __ASM_SEL(a,b) __ASM_FORM(b)
19# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
20#endif
21
22#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
23 inst##q##__VA_ARGS__)
24#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
25
26#define _ASM_PTR __ASM_SEL(.long, .quad)
27#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
28
29#define _ASM_MOV __ASM_SIZE(mov)
30#define _ASM_INC __ASM_SIZE(inc)
31#define _ASM_DEC __ASM_SIZE(dec)
32#define _ASM_ADD __ASM_SIZE(add)
33#define _ASM_SUB __ASM_SIZE(sub)
34#define _ASM_XADD __ASM_SIZE(xadd)
35#define _ASM_MUL __ASM_SIZE(mul)
36
37#define _ASM_AX __ASM_REG(ax)
38#define _ASM_BX __ASM_REG(bx)
39#define _ASM_CX __ASM_REG(cx)
40#define _ASM_DX __ASM_REG(dx)
41#define _ASM_SP __ASM_REG(sp)
42#define _ASM_BP __ASM_REG(bp)
43#define _ASM_SI __ASM_REG(si)
44#define _ASM_DI __ASM_REG(di)
45
46/*
47 * Macros to generate condition code outputs from inline assembly,
48 * The output operand must be type "bool".
49 */
50#ifdef __GCC_ASM_FLAG_OUTPUTS__
51# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
52# define CC_OUT(c) "=@cc" #c
53#else
54# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
55# define CC_OUT(c) [_cc_ ## c] "=qm"
56#endif
57
58/* Exception table entry */
59#ifdef __ASSEMBLY__
60# define _ASM_EXTABLE_HANDLE(from, to, handler) \
61 .pushsection "__ex_table","a" ; \
62 .balign 4 ; \
63 .long (from) - . ; \
64 .long (to) - . ; \
65 .long (handler) - . ; \
66 .popsection
67
68# define _ASM_EXTABLE(from, to) \
69 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
70
71# define _ASM_EXTABLE_FAULT(from, to) \
72 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
73
74# define _ASM_EXTABLE_EX(from, to) \
75 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
76
77# define _ASM_NOKPROBE(entry) \
78 .pushsection "_kprobe_blacklist","aw" ; \
79 _ASM_ALIGN ; \
80 _ASM_PTR (entry); \
81 .popsection
82
83.macro ALIGN_DESTINATION
84 /* check for bad alignment of destination */
85 movl %edi,%ecx
86 andl $7,%ecx
87 jz 102f /* already aligned */
88 subl $8,%ecx
89 negl %ecx
90 subl %ecx,%edx
91100: movb (%rsi),%al
92101: movb %al,(%rdi)
93 incq %rsi
94 incq %rdi
95 decl %ecx
96 jnz 100b
97102:
98 .section .fixup,"ax"
99103: addl %ecx,%edx /* ecx is zerorest also */
100 jmp copy_user_handle_tail
101 .previous
102
103 _ASM_EXTABLE(100b,103b)
104 _ASM_EXTABLE(101b,103b)
105 .endm
106
107#else
108# define _EXPAND_EXTABLE_HANDLE(x) #x
109# define _ASM_EXTABLE_HANDLE(from, to, handler) \
110 " .pushsection \"__ex_table\",\"a\"\n" \
111 " .balign 4\n" \
112 " .long (" #from ") - .\n" \
113 " .long (" #to ") - .\n" \
114 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
115 " .popsection\n"
116
117# define _ASM_EXTABLE(from, to) \
118 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
119
120# define _ASM_EXTABLE_FAULT(from, to) \
121 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
122
123# define _ASM_EXTABLE_EX(from, to) \
124 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
125
126/* For C file, we already have NOKPROBE_SYMBOL macro */
127#endif
128
129#endif /* _ASM_X86_ASM_H */