]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/asm-generic/sections.h
1 #ifndef _ASM_GENERIC_SECTIONS_H_
2 #define _ASM_GENERIC_SECTIONS_H_
4 /* References to section boundaries */
6 #include <linux/compiler.h>
7 #include <linux/types.h>
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
22 * Following global variables are optional and may be unavailable on some
23 * architectures and/or kernel configurations.
25 * __kprobes_text_start, __kprobes_text_end
26 * __entry_text_start, __entry_text_end
27 * __ctors_start, __ctors_end
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
[];
35 extern char __per_cpu_load
[], __per_cpu_start
[], __per_cpu_end
[];
36 extern char __kprobes_text_start
[], __kprobes_text_end
[];
37 extern char __entry_text_start
[], __entry_text_end
[];
38 extern char __start_rodata
[], __end_rodata
[];
40 /* Start and end of .ctors section - used for constructor calls. */
41 extern char __ctors_start
[], __ctors_end
[];
43 extern __visible
const void __nosave_begin
, __nosave_end
;
45 /* function descriptor handling (if any). Override
46 * in asm/sections.h */
47 #ifndef dereference_function_descriptor
48 #define dereference_function_descriptor(p) (p)
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
)
60 #ifndef arch_is_kernel_data
61 static inline int arch_is_kernel_data(unsigned long addr
)
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
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
78 static inline bool memory_contains(void *begin
, void *end
, void *virt
,
81 return virt
>= begin
&& virt
+ size
<= end
;
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
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.
95 static inline bool memory_intersects(void *begin
, void *end
, void *virt
,
98 void *vend
= virt
+ size
;
100 return (virt
>= begin
&& virt
< end
) || (vend
>= begin
&& vend
< end
);
104 * init_section_contains - checks if an object is contained within the init
106 * @virt: virtual address of the memory object
107 * @size: size of the memory object
109 * Returns: true if the object specified by @virt and @size is entirely
110 * contained within the init section, false otherwise.
112 static inline bool init_section_contains(void *virt
, size_t size
)
114 return memory_contains(__init_begin
, __init_end
, virt
, size
);
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
123 * Returns: true if an object's memory region, specified by @virt and @size,
124 * intersects with the init section, false otherwise.
126 static inline bool init_section_intersects(void *virt
, size_t size
)
128 return memory_intersects(__init_begin
, __init_end
, virt
, size
);
131 #endif /* _ASM_GENERIC_SECTIONS_H_ */