Linux kernel mirror (for testing)
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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 * [__start_ro_after_init, __end_ro_after_init]:
18 * contains .data..ro_after_init section
19 * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
20 * may be out of this range on some architectures.
21 * [_sinittext, _einittext]: contains .init.text.* sections
22 * [__bss_start, __bss_stop]: contains BSS sections
23 *
24 * Following global variables are optional and may be unavailable on some
25 * architectures and/or kernel configurations.
26 * _text, _data
27 * __kprobes_text_start, __kprobes_text_end
28 * __entry_text_start, __entry_text_end
29 * __ctors_start, __ctors_end
30 * __irqentry_text_start, __irqentry_text_end
31 * __softirqentry_text_start, __softirqentry_text_end
32 */
33extern char _text[], _stext[], _etext[];
34extern char _data[], _sdata[], _edata[];
35extern char __bss_start[], __bss_stop[];
36extern char __init_begin[], __init_end[];
37extern char _sinittext[], _einittext[];
38extern char __start_ro_after_init[], __end_ro_after_init[];
39extern char _end[];
40extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
41extern char __kprobes_text_start[], __kprobes_text_end[];
42extern char __entry_text_start[], __entry_text_end[];
43extern char __start_rodata[], __end_rodata[];
44extern char __irqentry_text_start[], __irqentry_text_end[];
45extern char __softirqentry_text_start[], __softirqentry_text_end[];
46
47/* Start and end of .ctors section - used for constructor calls. */
48extern char __ctors_start[], __ctors_end[];
49
50extern __visible const void __nosave_begin, __nosave_end;
51
52/* function descriptor handling (if any). Override
53 * in asm/sections.h */
54#ifndef dereference_function_descriptor
55#define dereference_function_descriptor(p) (p)
56#endif
57
58/* random extra sections (if any). Override
59 * in asm/sections.h */
60#ifndef arch_is_kernel_text
61static inline int arch_is_kernel_text(unsigned long addr)
62{
63 return 0;
64}
65#endif
66
67#ifndef arch_is_kernel_data
68static inline int arch_is_kernel_data(unsigned long addr)
69{
70 return 0;
71}
72#endif
73
74/**
75 * memory_contains - checks if an object is contained within a memory region
76 * @begin: virtual address of the beginning of the memory region
77 * @end: virtual address of the end of the memory region
78 * @virt: virtual address of the memory object
79 * @size: size of the memory object
80 *
81 * Returns: true if the object specified by @virt and @size is entirely
82 * contained within the memory region defined by @begin and @end, false
83 * otherwise.
84 */
85static inline bool memory_contains(void *begin, void *end, void *virt,
86 size_t size)
87{
88 return virt >= begin && virt + size <= end;
89}
90
91/**
92 * memory_intersects - checks if the region occupied by an object intersects
93 * with another memory region
94 * @begin: virtual address of the beginning of the memory regien
95 * @end: virtual address of the end of the memory region
96 * @virt: virtual address of the memory object
97 * @size: size of the memory object
98 *
99 * Returns: true if an object's memory region, specified by @virt and @size,
100 * intersects with the region specified by @begin and @end, false otherwise.
101 */
102static inline bool memory_intersects(void *begin, void *end, void *virt,
103 size_t size)
104{
105 void *vend = virt + size;
106
107 return (virt >= begin && virt < end) || (vend >= begin && vend < end);
108}
109
110/**
111 * init_section_contains - checks if an object is contained within the init
112 * section
113 * @virt: virtual address of the memory object
114 * @size: size of the memory object
115 *
116 * Returns: true if the object specified by @virt and @size is entirely
117 * contained within the init section, false otherwise.
118 */
119static inline bool init_section_contains(void *virt, size_t size)
120{
121 return memory_contains(__init_begin, __init_end, virt, size);
122}
123
124/**
125 * init_section_intersects - checks if the region occupied by an object
126 * intersects with the init section
127 * @virt: virtual address of the memory object
128 * @size: size of the memory object
129 *
130 * Returns: true if an object's memory region, specified by @virt and @size,
131 * intersects with the init section, false otherwise.
132 */
133static inline bool init_section_intersects(void *virt, size_t size)
134{
135 return memory_intersects(__init_begin, __init_end, virt, size);
136}
137
138#endif /* _ASM_GENERIC_SECTIONS_H_ */