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