1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_SECTIONS_H_
3 #define _ASM_GENERIC_SECTIONS_H_
5 /* References to section boundaries */
7 #include <linux/compiler.h>
8 #include <linux/types.h>
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
25 * Following global variables are optional and may be unavailable on some
26 * architectures and/or kernel configurations.
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
34 extern char _text
[], _stext
[], _etext
[];
35 extern char _data
[], _sdata
[], _edata
[];
36 extern char __bss_start
[], __bss_stop
[];
37 extern char __init_begin
[], __init_end
[];
38 extern char _sinittext
[], _einittext
[];
39 extern char __start_ro_after_init
[], __end_ro_after_init
[];
41 extern char __per_cpu_load
[], __per_cpu_start
[], __per_cpu_end
[];
42 extern char __kprobes_text_start
[], __kprobes_text_end
[];
43 extern char __entry_text_start
[], __entry_text_end
[];
44 extern char __start_rodata
[], __end_rodata
[];
45 extern char __irqentry_text_start
[], __irqentry_text_end
[];
46 extern char __softirqentry_text_start
[], __softirqentry_text_end
[];
47 extern char __start_once
[], __end_once
[];
49 /* Start and end of .ctors section - used for constructor calls. */
50 extern char __ctors_start
[], __ctors_end
[];
52 extern __visible
const void __nosave_begin
, __nosave_end
;
54 /* function descriptor handling (if any). Override
55 * in asm/sections.h */
56 #ifndef dereference_function_descriptor
57 #define dereference_function_descriptor(p) (p)
60 /* random extra sections (if any). Override
61 * in asm/sections.h */
62 #ifndef arch_is_kernel_text
63 static inline int arch_is_kernel_text(unsigned long addr
)
69 #ifndef arch_is_kernel_data
70 static inline int arch_is_kernel_data(unsigned long addr
)
77 * memory_contains - checks if an object is contained within a memory region
78 * @begin: virtual address of the beginning of the memory region
79 * @end: virtual address of the end of the memory region
80 * @virt: virtual address of the memory object
81 * @size: size of the memory object
83 * Returns: true if the object specified by @virt and @size is entirely
84 * contained within the memory region defined by @begin and @end, false
87 static inline bool memory_contains(void *begin
, void *end
, void *virt
,
90 return virt
>= begin
&& virt
+ size
<= end
;
94 * memory_intersects - checks if the region occupied by an object intersects
95 * with another memory region
96 * @begin: virtual address of the beginning of the memory regien
97 * @end: virtual address of the end of the memory region
98 * @virt: virtual address of the memory object
99 * @size: size of the memory object
101 * Returns: true if an object's memory region, specified by @virt and @size,
102 * intersects with the region specified by @begin and @end, false otherwise.
104 static inline bool memory_intersects(void *begin
, void *end
, void *virt
,
107 void *vend
= virt
+ size
;
109 return (virt
>= begin
&& virt
< end
) || (vend
>= begin
&& vend
< end
);
113 * init_section_contains - checks if an object is contained within the init
115 * @virt: virtual address of the memory object
116 * @size: size of the memory object
118 * Returns: true if the object specified by @virt and @size is entirely
119 * contained within the init section, false otherwise.
121 static inline bool init_section_contains(void *virt
, size_t size
)
123 return memory_contains(__init_begin
, __init_end
, virt
, size
);
127 * init_section_intersects - checks if the region occupied by an object
128 * intersects with the init section
129 * @virt: virtual address of the memory object
130 * @size: size of the memory object
132 * Returns: true if an object's memory region, specified by @virt and @size,
133 * intersects with the init section, false otherwise.
135 static inline bool init_section_intersects(void *virt
, size_t size
)
137 return memory_intersects(__init_begin
, __init_end
, virt
, size
);
140 #endif /* _ASM_GENERIC_SECTIONS_H_ */