/* 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[]; /* Start and end of instrumentation protected text section */extern char __noinstr_text_start[], __noinstr_text_end[]; extern __visible const void __nosave_begin, __nosave_end; /* Function descriptor handling (if any).  Override in asm/sections.h */#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORSvoid *dereference_function_descriptor(void *ptr);void *dereference_kernel_function_descriptor(void *ptr);#else#define dereference_function_descriptor(p) ((void *)(p))#define dereference_kernel_function_descriptor(p) ((void *)(p)) /* An address is simply the address of the function. */typedef struct {	unsigned long addr;} func_desc_t;#endif static inline bool have_function_descriptors(void){	return IS_ENABLED(CONFIG_HAVE_FUNCTION_DESCRIPTORS);} /** * 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 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 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; 	if (virt < end && vend > begin)		return true; 	return false;} /** * 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_core_data - checks if the pointer address is located in the *			 .data or .bss section * * @addr: address to check * * Returns: true if the address is located in .data or .bss, false otherwise. * Note: On some archs it may return true for core RODATA, and false *       for others. But will always be true for core RW data. */static inline bool is_kernel_core_data(unsigned long addr){	if (addr >= (unsigned long)_sdata && addr < (unsigned long)_edata)		return true; 	if (addr >= (unsigned long)__bss_start &&	    addr < (unsigned long)__bss_stop)		return true; 	return false;} /** * 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;} static inline bool is_kernel_ro_after_init(unsigned long addr){	return addr >= (unsigned long)__start_ro_after_init &&	       addr < (unsigned long)__end_ro_after_init;}/** * is_kernel_inittext - checks if the pointer address is located in the *                      .init.text section * * @addr: address to check * * Returns: true if the address is located in .init.text, false otherwise. */static inline bool is_kernel_inittext(unsigned long addr){	return addr >= (unsigned long)_sinittext &&	       addr < (unsigned long)_einittext;} /** * __is_kernel_text - checks if the pointer address is located in the *                    .text section * * @addr: address to check * * Returns: true if the address is located in .text, false otherwise. * Note: an internal helper, only check the range of _stext to _etext. */static inline bool __is_kernel_text(unsigned long addr){	return addr >= (unsigned long)_stext &&	       addr < (unsigned long)_etext;} /** * __is_kernel - checks if the pointer address is located in the kernel range * * @addr: address to check * * Returns: true if the address is located in the kernel range, false otherwise. * Note: an internal helper, check the range of _stext to _end, *       and range from __init_begin to __init_end, which can be outside *       of the _stext to _end range. */static inline bool __is_kernel(unsigned long addr){	return ((addr >= (unsigned long)_stext &&	         addr < (unsigned long)_end) ||		(addr >= (unsigned long)__init_begin &&		 addr < (unsigned long)__init_end));} #endif /* _ASM_GENERIC_SECTIONS_H_ */