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 
8 /*
9  * Usage guidelines:
10  * _text, _data: architecture specific, don't use them in arch-independent code
11  * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
12  *                   and/or .init.* sections
13  * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
14  *                   and/or .init.* sections.
15  * [__start_rodata, __end_rodata]: contains .rodata.* sections
16  * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
17  *                   may be out of this range on some architectures.
18  * [_sinittext, _einittext]: contains .init.text.* sections
19  * [__bss_start, __bss_stop]: contains BSS sections
20  *
21  * Following global variables are optional and may be unavailable on some
22  * architectures and/or kernel configurations.
23  *	_text, _data
24  *	__kprobes_text_start, __kprobes_text_end
25  *	__entry_text_start, __entry_text_end
26  *	__ctors_start, __ctors_end
27  */
28 extern char _text[], _stext[], _etext[];
29 extern char _data[], _sdata[], _edata[];
30 extern char __bss_start[], __bss_stop[];
31 extern char __init_begin[], __init_end[];
32 extern char _sinittext[], _einittext[];
33 extern char _end[];
34 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
35 extern char __kprobes_text_start[], __kprobes_text_end[];
36 extern char __entry_text_start[], __entry_text_end[];
37 extern char __start_rodata[], __end_rodata[];
38 
39 /* Start and end of .ctors section - used for constructor calls. */
40 extern char __ctors_start[], __ctors_end[];
41 
42 extern __visible const void __nosave_begin, __nosave_end;
43 
44 /* function descriptor handling (if any).  Override
45  * in asm/sections.h */
46 #ifndef dereference_function_descriptor
47 #define dereference_function_descriptor(p) (p)
48 #endif
49 
50 /* random extra sections (if any).  Override
51  * in asm/sections.h */
52 #ifndef arch_is_kernel_text
53 static inline int arch_is_kernel_text(unsigned long addr)
54 {
55 	return 0;
56 }
57 #endif
58 
59 #ifndef arch_is_kernel_data
60 static inline int arch_is_kernel_data(unsigned long addr)
61 {
62 	return 0;
63 }
64 #endif
65 
66 #endif /* _ASM_GENERIC_SECTIONS_H_ */
67