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1da177e4 LT |
1 | #ifndef _ASM_GENERIC_SECTIONS_H_ |
2 | #define _ASM_GENERIC_SECTIONS_H_ | |
3 | ||
4 | /* References to section boundaries */ | |
5 | ||
7f8998c7 | 6 | #include <linux/compiler.h> |
97955936 | 7 | #include <linux/types.h> |
7f8998c7 | 8 | |
1622d1ab JL |
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 | */ | |
1da177e4 LT |
29 | extern char _text[], _stext[], _etext[]; |
30 | extern char _data[], _sdata[], _edata[]; | |
31 | extern char __bss_start[], __bss_stop[]; | |
32 | extern char __init_begin[], __init_end[]; | |
33 | extern char _sinittext[], _einittext[]; | |
34 | extern char _end[]; | |
3e5d8f97 | 35 | extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[]; |
d0aaff97 | 36 | extern char __kprobes_text_start[], __kprobes_text_end[]; |
ea714547 | 37 | extern char __entry_text_start[], __entry_text_end[]; |
a581c2a4 | 38 | extern char __start_rodata[], __end_rodata[]; |
1da177e4 | 39 | |
b99b87f7 PO |
40 | /* Start and end of .ctors section - used for constructor calls. */ |
41 | extern char __ctors_start[], __ctors_end[]; | |
42 | ||
7f8998c7 GU |
43 | extern __visible const void __nosave_begin, __nosave_end; |
44 | ||
deac93df JB |
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 | ||
00afe029 MF |
51 | /* random extra sections (if any). Override |
52 | * in asm/sections.h */ | |
53 | #ifndef arch_is_kernel_text | |
54 | static inline int arch_is_kernel_text(unsigned long addr) | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | #endif | |
59 | ||
60 | #ifndef arch_is_kernel_data | |
61 | static inline int arch_is_kernel_data(unsigned long addr) | |
62 | { | |
63 | return 0; | |
64 | } | |
65 | #endif | |
66 | ||
97955936 TR |
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 | */ | |
78 | static 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 | */ | |
95 | static 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 | */ | |
112 | static 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 | */ | |
126 | static inline bool init_section_intersects(void *virt, size_t size) | |
127 | { | |
128 | return memory_intersects(__init_begin, __init_end, virt, size); | |
129 | } | |
130 | ||
1da177e4 | 131 | #endif /* _ASM_GENERIC_SECTIONS_H_ */ |