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[];
48 /* Start and end of .ctors section - used for constructor calls. */
49 extern char __ctors_start[], __ctors_end[];
51 extern __visible const void __nosave_begin, __nosave_end;
53 /* function descriptor handling (if any). Override
54 * in asm/sections.h */
55 #ifndef dereference_function_descriptor
56 #define dereference_function_descriptor(p) (p)
59 /* random extra sections (if any). Override
60 * in asm/sections.h */
61 #ifndef arch_is_kernel_text
62 static inline int arch_is_kernel_text(unsigned long addr)
68 #ifndef arch_is_kernel_data
69 static inline int arch_is_kernel_data(unsigned long addr)
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
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
86 static inline bool memory_contains(void *begin, void *end, void *virt,
89 return virt >= begin && virt + size <= end;
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 region
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
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.
103 static inline bool memory_intersects(void *begin, void *end, void *virt,
106 void *vend = virt + size;
108 if (virt < end && vend > begin)
115 * init_section_contains - checks if an object is contained within the init
117 * @virt: virtual address of the memory object
118 * @size: size of the memory object
120 * Returns: true if the object specified by @virt and @size is entirely
121 * contained within the init section, false otherwise.
123 static inline bool init_section_contains(void *virt, size_t size)
125 return memory_contains(__init_begin, __init_end, virt, size);
129 * init_section_intersects - checks if the region occupied by an object
130 * intersects with the init section
131 * @virt: virtual address of the memory object
132 * @size: size of the memory object
134 * Returns: true if an object's memory region, specified by @virt and @size,
135 * intersects with the init section, false otherwise.
137 static inline bool init_section_intersects(void *virt, size_t size)
139 return memory_intersects(__init_begin, __init_end, virt, size);
142 #endif /* _ASM_GENERIC_SECTIONS_H_ */