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
36#define _ASM_AX __ASM_REG(ax)
37#define _ASM_BX __ASM_REG(bx)
38#define _ASM_CX __ASM_REG(cx)
39#define _ASM_DX __ASM_REG(dx)
40#define _ASM_SP __ASM_REG(sp)
41#define _ASM_BP __ASM_REG(bp)
42#define _ASM_SI __ASM_REG(si)
43#define _ASM_DI __ASM_REG(di)
44
45/* Exception table entry */
46#ifdef __ASSEMBLY__
47# define _ASM_EXTABLE(from,to) \
48 .pushsection "__ex_table","a" ; \
49 .balign 8 ; \
50 .long (from) - . ; \
51 .long (to) - . ; \
52 .popsection
53
54# define _ASM_EXTABLE_EX(from,to) \
55 .pushsection "__ex_table","a" ; \
56 .balign 8 ; \
57 .long (from) - . ; \
58 .long (to) - . + 0x7ffffff0 ; \
59 .popsection
60
61# define _ASM_NOKPROBE(entry) \
62 .pushsection "_kprobe_blacklist","aw" ; \
63 _ASM_ALIGN ; \
64 _ASM_PTR (entry); \
65 .popsection
66
67.macro ALIGN_DESTINATION
68 /* check for bad alignment of destination */
69 movl %edi,%ecx
70 andl $7,%ecx
71 jz 102f /* already aligned */
72 subl $8,%ecx
73 negl %ecx
74 subl %ecx,%edx
75100: movb (%rsi),%al
76101: movb %al,(%rdi)
77 incq %rsi
78 incq %rdi
79 decl %ecx
80 jnz 100b
81102:
82 .section .fixup,"ax"
83103: addl %ecx,%edx /* ecx is zerorest also */
84 jmp copy_user_handle_tail
85 .previous
86
87 _ASM_EXTABLE(100b,103b)
88 _ASM_EXTABLE(101b,103b)
89 .endm
90
91#else
92# define _ASM_EXTABLE(from,to) \
93 " .pushsection \"__ex_table\",\"a\"\n" \
94 " .balign 8\n" \
95 " .long (" #from ") - .\n" \
96 " .long (" #to ") - .\n" \
97 " .popsection\n"
98
99# define _ASM_EXTABLE_EX(from,to) \
100 " .pushsection \"__ex_table\",\"a\"\n" \
101 " .balign 8\n" \
102 " .long (" #from ") - .\n" \
103 " .long (" #to ") - . + 0x7ffffff0\n" \
104 " .popsection\n"
105/* For C file, we already have NOKPROBE_SYMBOL macro */
106#endif
107
108#endif /* _ASM_X86_ASM_H */