text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef _ASM_GENERIC_SECTIONS_H_
  #define _ASM_GENERIC_SECTIONS_H_
  
  /* References to section boundaries */
  
  #include <linux/compiler.h>
  #include <linux/types.h>
  
  /*
   * Usage guidelines:
   * _text, _data: architecture specific, don't use them in arch-independent code
   * [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
   *                   and/or .init.* sections
   * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
   *                   and/or .init.* sections.
   * [__start_rodata, __end_rodata]: contains .rodata.* sections
   * [__start_ro_after_init, __end_ro_after_init]:
   *		     contains .data..ro_after_init section
   * [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
   *                   may be out of this range on some architectures.
   * [_sinittext, _einittext]: contains .init.text.* sections
   * [__bss_start, __bss_stop]: contains BSS sections
   *
   * Following global variables are optional and may be unavailable on some
   * architectures and/or kernel configurations.
   *	_text, _data
   *	__kprobes_text_start, __kprobes_text_end
   *	__entry_text_start, __entry_text_end
   *	__ctors_start, __ctors_end
   *	__irqentry_text_start, __irqentry_text_end
   *	__softirqentry_text_start, __softirqentry_text_end
   *	__start_opd, __end_opd
   */
  extern char _text[], _stext[], _etext[];
  extern char _data[], _sdata[], _edata[];
  extern char __bss_start[], __bss_stop[];
  extern char __init_begin[], __init_end[];
  extern char _sinittext[], _einittext[];
  extern char __start_ro_after_init[], __end_ro_after_init[];
  extern char _end[];
  extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
  extern char __kprobes_text_start[], __kprobes_text_end[];
  extern char __entry_text_start[], __entry_text_end[];
  extern char __start_rodata[], __end_rodata[];
  extern char __irqentry_text_start[], __irqentry_text_end[];
  extern char __softirqentry_text_start[], __softirqentry_text_end[];
  extern char __start_once[], __end_once[];
  
  /* Start and end of .ctors section - used for constructor calls. */
  extern char __ctors_start[], __ctors_end[];
  
  /* Start and end of .opd section - used for function descriptors. */
  extern char __start_opd[], __end_opd[];
  
  extern __visible const void __nosave_begin, __nosave_end;
  
  /* Function descriptor handling (if any).  Override in asm/sections.h */
  #ifndef dereference_function_descriptor
  #define dereference_function_descriptor(p) (p)
  #define dereference_kernel_function_descriptor(p) (p)
  #endif
  
  /* random extra sections (if any).  Override
   * in asm/sections.h */
  #ifndef arch_is_kernel_text
  static inline int arch_is_kernel_text(unsigned long addr)
  {
  	return 0;
  }
  #endif
  
  #ifndef arch_is_kernel_data
  static inline int arch_is_kernel_data(unsigned long addr)
  {
  	return 0;
  }
  #endif
  
  /*
   * Check if an address is part of freed initmem. This is needed on architectures
   * with virt == phys kernel mapping, for code that wants to check if an address
   * is part of a static object within [_stext, _end]. After initmem is freed,
   * memory can be allocated from it, and such allocations would then have
   * addresses within the range [_stext, _end].
   */
  #ifndef arch_is_kernel_initmem_freed
  static inline int arch_is_kernel_initmem_freed(unsigned long addr)
  {
  	return 0;
  }
  #endif
  
  /**
   * memory_contains - checks if an object is contained within a memory region
   * @begin: virtual address of the beginning of the memory region
   * @end: virtual address of the end of the memory region
   * @virt: virtual address of the memory object
   * @size: size of the memory object
   *
   * Returns: true if the object specified by @virt and @size is entirely
   * contained within the memory region defined by @begin and @end, false
   * otherwise.
   */
  static inline bool memory_contains(void *begin, void *end, void *virt,
  				   size_t size)
  {
  	return virt >= begin && virt + size <= end;
  }
  
  /**
   * memory_intersects - checks if the region occupied by an object intersects
   *                     with another memory region
   * @begin: virtual address of the beginning of the memory regien
   * @end: virtual address of the end of the memory region
   * @virt: virtual address of the memory object
   * @size: size of the memory object
   *
   * Returns: true if an object's memory region, specified by @virt and @size,
   * intersects with the region specified by @begin and @end, false otherwise.
   */
  static inline bool memory_intersects(void *begin, void *end, void *virt,
  				     size_t size)
  {
  	void *vend = virt + size;
  
  	return (virt >= begin && virt < end) || (vend >= begin && vend < end);
  }
  
  /**
   * init_section_contains - checks if an object is contained within the init
   *                         section
   * @virt: virtual address of the memory object
   * @size: size of the memory object
   *
   * Returns: true if the object specified by @virt and @size is entirely
   * contained within the init section, false otherwise.
   */
  static inline bool init_section_contains(void *virt, size_t size)
  {
  	return memory_contains(__init_begin, __init_end, virt, size);
  }
  
  /**
   * init_section_intersects - checks if the region occupied by an object
   *                           intersects with the init section
   * @virt: virtual address of the memory object
   * @size: size of the memory object
   *
   * Returns: true if an object's memory region, specified by @virt and @size,
   * intersects with the init section, false otherwise.
   */
  static inline bool init_section_intersects(void *virt, size_t size)
  {
  	return memory_intersects(__init_begin, __init_end, virt, size);
  }
  
  /**
   * is_kernel_rodata - checks if the pointer address is located in the
   *                    .rodata section
   *
   * @addr: address to check
   *
   * Returns: true if the address is located in .rodata, false otherwise.
   */
  static inline bool is_kernel_rodata(unsigned long addr)
  {
  	return addr >= (unsigned long)__start_rodata &&
  	       addr < (unsigned long)__end_rodata;
  }
  
  #endif /* _ASM_GENERIC_SECTIONS_H_ */
  