arch/x86/kernel/ibt_selftest.S

File Facts

System

Linux kernel

Corpus path

arch/x86/kernel/ibt_selftest.S

Extension

.S

Size

402 bytes

Lines

18

Domain

Architecture Layer

Bucket

arch/x86

Inferred role

Architecture Layer: arch/x86

Status

atlas-only

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

• linux/linkage.h
• linux/objtool.h
• asm/nospec-branch.h

Detected Declarations

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

Annotated Snippet

#include <linux/linkage.h>
#include <linux/objtool.h>
#include <asm/nospec-branch.h>

SYM_CODE_START(ibt_selftest_noendbr)
	ANNOTATE_NOENDBR
	UNWIND_HINT_FUNC
	/* #CP handler sets %ax to 0 */
	RET
SYM_CODE_END(ibt_selftest_noendbr)

SYM_FUNC_START(ibt_selftest)
	lea ibt_selftest_noendbr(%rip), %rax
	ANNOTATE_RETPOLINE_SAFE
	jmp *%rax
SYM_FUNC_END(ibt_selftest)

Annotation

• Immediate include surface: `linux/linkage.h`, `linux/objtool.h`, `asm/nospec-branch.h`.
• Atlas domain: Architecture Layer / arch/x86.
• Implementation status: atlas-only.

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.