arch/x86/entry/vdso/extable.h

File Facts

System

Linux kernel

Corpus path

arch/x86/entry/vdso/extable.h

Extension

.h

Size

777 bytes

Lines

29

Domain

Architecture Layer

Bucket

arch/x86

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __VDSO_EXTABLE_H
#define __VDSO_EXTABLE_H

/*
 * Inject exception fixup for vDSO code.  Unlike normal exception fixup,
 * vDSO uses a dedicated handler the addresses are relative to the overall
 * exception table, not each individual entry.
 */
#ifdef __ASSEMBLER__
#define _ASM_VDSO_EXTABLE_HANDLE(from, to)	\
	ASM_VDSO_EXTABLE_HANDLE from to

.macro ASM_VDSO_EXTABLE_HANDLE from:req to:req
	.pushsection __ex_table, "a"
	.long (\from) - __ex_table
	.long (\to) - __ex_table
	.popsection
.endm
#else
#define _ASM_VDSO_EXTABLE_HANDLE(from, to)	\
	".pushsection __ex_table, \"a\"\n"      \
	".long (" #from ") - __ex_table\n"      \
	".long (" #to ") - __ex_table\n"        \
	".popsection\n"
#endif

#endif /* __VDSO_EXTABLE_H */

Annotation

• Atlas domain: Architecture Layer / arch/x86.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.