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