include/asm-generic/sections.h

   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_ */