include/asm-generic/sections.h

Source file repositories/reference/linux-study-clean/include/asm-generic/sections.h

File Facts

System
Linux kernel
Corpus path
include/asm-generic/sections.h
Extension
.h
Size
7833 bytes
Lines
236
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#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_DESCRIPTORS
void *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,

Annotation

Implementation Notes