Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_SECTIONS_H_
3#define _ASM_GENERIC_SECTIONS_H_
4
5/* References to section boundaries */
6
7#include <linux/compiler.h>
8#include <linux/types.h>
9
10/*
11 * Usage guidelines:
12 * _text, _data: architecture specific, don't use them in arch-independent code
13 * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
14 * and/or .init.* sections
15 * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
16 * and/or .init.* sections.
17 * [__start_rodata, __end_rodata]: contains .rodata.* sections
18 * [__start_ro_after_init, __end_ro_after_init]:
19 * contains .data..ro_after_init section
20 * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
21 * may be out of this range on some architectures.
22 * [_sinittext, _einittext]: contains .init.text.* sections
23 * [__bss_start, __bss_stop]: contains BSS sections
24 *
25 * Following global variables are optional and may be unavailable on some
26 * architectures and/or kernel configurations.
27 * _text, _data
28 * __kprobes_text_start, __kprobes_text_end
29 * __entry_text_start, __entry_text_end
30 * __ctors_start, __ctors_end
31 * __irqentry_text_start, __irqentry_text_end
32 * __softirqentry_text_start, __softirqentry_text_end
33 */
34extern char _text[], _stext[], _etext[];
35extern char _data[], _sdata[], _edata[];
36extern char __bss_start[], __bss_stop[];
37extern char __init_begin[], __init_end[];
38extern char _sinittext[], _einittext[];
39extern char __start_ro_after_init[], __end_ro_after_init[];
40extern char _end[];
41extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
42extern char __kprobes_text_start[], __kprobes_text_end[];
43extern char __entry_text_start[], __entry_text_end[];
44extern char __start_rodata[], __end_rodata[];
45extern char __irqentry_text_start[], __irqentry_text_end[];
46extern char __softirqentry_text_start[], __softirqentry_text_end[];
47
48/* Start and end of .ctors section - used for constructor calls. */
49extern char __ctors_start[], __ctors_end[];
50
51extern __visible const void __nosave_begin, __nosave_end;
52
53/* function descriptor handling (if any). Override
54 * in asm/sections.h */
55#ifndef dereference_function_descriptor
56#define dereference_function_descriptor(p) (p)
57#endif
58
59/* random extra sections (if any). Override
60 * in asm/sections.h */
61#ifndef arch_is_kernel_text
62static inline int arch_is_kernel_text(unsigned long addr)
63{
64 return 0;
65}
66#endif
67
68#ifndef arch_is_kernel_data
69static inline int arch_is_kernel_data(unsigned long addr)
70{
71 return 0;
72}
73#endif
74
75/**
76 * memory_contains - checks if an object is contained within a memory region
77 * @begin: virtual address of the beginning of the memory region
78 * @end: virtual address of the end of the memory region
79 * @virt: virtual address of the memory object
80 * @size: size of the memory object
81 *
82 * Returns: true if the object specified by @virt and @size is entirely
83 * contained within the memory region defined by @begin and @end, false
84 * otherwise.
85 */
86static inline bool memory_contains(void *begin, void *end, void *virt,
87 size_t size)
88{
89 return virt >= begin && virt + size <= end;
90}
91
92/**
93 * memory_intersects - checks if the region occupied by an object intersects
94 * with another memory region
95 * @begin: virtual address of the beginning of the memory regien
96 * @end: virtual address of the end of the memory region
97 * @virt: virtual address of the memory object
98 * @size: size of the memory object
99 *
100 * Returns: true if an object's memory region, specified by @virt and @size,
101 * intersects with the region specified by @begin and @end, false otherwise.
102 */
103static inline bool memory_intersects(void *begin, void *end, void *virt,
104 size_t size)
105{
106 void *vend = virt + size;
107
108 return (virt >= begin && virt < end) || (vend >= begin && vend < end);
109}
110
111/**
112 * init_section_contains - checks if an object is contained within the init
113 * section
114 * @virt: virtual address of the memory object
115 * @size: size of the memory object
116 *
117 * Returns: true if the object specified by @virt and @size is entirely
118 * contained within the init section, false otherwise.
119 */
120static inline bool init_section_contains(void *virt, size_t size)
121{
122 return memory_contains(__init_begin, __init_end, virt, size);
123}
124
125/**
126 * init_section_intersects - checks if the region occupied by an object
127 * intersects with the init section
128 * @virt: virtual address of the memory object
129 * @size: size of the memory object
130 *
131 * Returns: true if an object's memory region, specified by @virt and @size,
132 * intersects with the init section, false otherwise.
133 */
134static inline bool init_section_intersects(void *virt, size_t size)
135{
136 return memory_intersects(__init_begin, __init_end, virt, size);
137}
138
139#endif /* _ASM_GENERIC_SECTIONS_H_ */