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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236/* 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_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_ */