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1#ifndef _ASM_GENERIC_SECTIONS_H_
2#define _ASM_GENERIC_SECTIONS_H_
3
4/* References to section boundaries */
5
6extern char _text[], _stext[], _etext[];
7extern char _data[], _sdata[], _edata[];
8extern char __bss_start[], __bss_stop[];
9extern char __init_begin[], __init_end[];
10extern char _sinittext[], _einittext[];
11extern char _end[];
12extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
13extern char __kprobes_text_start[], __kprobes_text_end[];
14extern char __entry_text_start[], __entry_text_end[];
15extern char __initdata_begin[], __initdata_end[];
16extern char __start_rodata[], __end_rodata[];
17
18/* Start and end of .ctors section - used for constructor calls. */
19extern char __ctors_start[], __ctors_end[];
20
21/* function descriptor handling (if any). Override
22 * in asm/sections.h */
23#ifndef dereference_function_descriptor
24#define dereference_function_descriptor(p) (p)
25#endif
26
27/* random extra sections (if any). Override
28 * in asm/sections.h */
29#ifndef arch_is_kernel_text
30static inline int arch_is_kernel_text(unsigned long addr)
31{
32 return 0;
33}
34#endif
35
36#ifndef arch_is_kernel_data
37static inline int arch_is_kernel_data(unsigned long addr)
38{
39 return 0;
40}
41#endif
42
43#endif /* _ASM_GENERIC_SECTIONS_H_ */
1#ifndef _ASM_GENERIC_SECTIONS_H_
2#define _ASM_GENERIC_SECTIONS_H_
3
4/* References to section boundaries */
5
6#include <linux/compiler.h>
7#include <linux/types.h>
8
9/*
10 * Usage guidelines:
11 * _text, _data: architecture specific, don't use them in arch-independent code
12 * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
13 * and/or .init.* sections
14 * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
15 * and/or .init.* sections.
16 * [__start_rodata, __end_rodata]: contains .rodata.* sections
17 * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
18 * may be out of this range on some architectures.
19 * [_sinittext, _einittext]: contains .init.text.* sections
20 * [__bss_start, __bss_stop]: contains BSS sections
21 *
22 * Following global variables are optional and may be unavailable on some
23 * architectures and/or kernel configurations.
24 * _text, _data
25 * __kprobes_text_start, __kprobes_text_end
26 * __entry_text_start, __entry_text_end
27 * __ctors_start, __ctors_end
28 */
29extern char _text[], _stext[], _etext[];
30extern char _data[], _sdata[], _edata[];
31extern char __bss_start[], __bss_stop[];
32extern char __init_begin[], __init_end[];
33extern char _sinittext[], _einittext[];
34extern char _end[];
35extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
36extern char __kprobes_text_start[], __kprobes_text_end[];
37extern char __entry_text_start[], __entry_text_end[];
38extern char __start_rodata[], __end_rodata[];
39
40/* Start and end of .ctors section - used for constructor calls. */
41extern char __ctors_start[], __ctors_end[];
42
43extern __visible const void __nosave_begin, __nosave_end;
44
45/* function descriptor handling (if any). Override
46 * in asm/sections.h */
47#ifndef dereference_function_descriptor
48#define dereference_function_descriptor(p) (p)
49#endif
50
51/* random extra sections (if any). Override
52 * in asm/sections.h */
53#ifndef arch_is_kernel_text
54static inline int arch_is_kernel_text(unsigned long addr)
55{
56 return 0;
57}
58#endif
59
60#ifndef arch_is_kernel_data
61static inline int arch_is_kernel_data(unsigned long addr)
62{
63 return 0;
64}
65#endif
66
67/**
68 * memory_contains - checks if an object is contained within a memory region
69 * @begin: virtual address of the beginning of the memory region
70 * @end: virtual address of the end of the memory region
71 * @virt: virtual address of the memory object
72 * @size: size of the memory object
73 *
74 * Returns: true if the object specified by @virt and @size is entirely
75 * contained within the memory region defined by @begin and @end, false
76 * otherwise.
77 */
78static inline bool memory_contains(void *begin, void *end, void *virt,
79 size_t size)
80{
81 return virt >= begin && virt + size <= end;
82}
83
84/**
85 * memory_intersects - checks if the region occupied by an object intersects
86 * with another memory region
87 * @begin: virtual address of the beginning of the memory regien
88 * @end: virtual address of the end of the memory region
89 * @virt: virtual address of the memory object
90 * @size: size of the memory object
91 *
92 * Returns: true if an object's memory region, specified by @virt and @size,
93 * intersects with the region specified by @begin and @end, false otherwise.
94 */
95static inline bool memory_intersects(void *begin, void *end, void *virt,
96 size_t size)
97{
98 void *vend = virt + size;
99
100 return (virt >= begin && virt < end) || (vend >= begin && vend < end);
101}
102
103/**
104 * init_section_contains - checks if an object is contained within the init
105 * section
106 * @virt: virtual address of the memory object
107 * @size: size of the memory object
108 *
109 * Returns: true if the object specified by @virt and @size is entirely
110 * contained within the init section, false otherwise.
111 */
112static inline bool init_section_contains(void *virt, size_t size)
113{
114 return memory_contains(__init_begin, __init_end, virt, size);
115}
116
117/**
118 * init_section_intersects - checks if the region occupied by an object
119 * intersects with the init section
120 * @virt: virtual address of the memory object
121 * @size: size of the memory object
122 *
123 * Returns: true if an object's memory region, specified by @virt and @size,
124 * intersects with the init section, false otherwise.
125 */
126static inline bool init_section_intersects(void *virt, size_t size)
127{
128 return memory_intersects(__init_begin, __init_end, virt, size);
129}
130
131#endif /* _ASM_GENERIC_SECTIONS_H_ */