tools/testing/selftests/rseq/rseq-x86-thread-pointer.h

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/rseq/rseq-x86-thread-pointer.h

Extension

.h

Size

687 bytes

Lines

41

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• features.h

Detected Declarations

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

Annotated Snippet

#ifndef _RSEQ_X86_THREAD_POINTER
#define _RSEQ_X86_THREAD_POINTER

#include <features.h>

#ifdef __cplusplus
extern "C" {
#endif

#if __GNUC_PREREQ (11, 1)
static inline void *rseq_thread_pointer(void)
{
	return __builtin_thread_pointer();
}
#else
static inline void *rseq_thread_pointer(void)
{
	void *__result;

# ifdef __x86_64__
	__asm__ ("mov %%fs:0, %0" : "=r" (__result));
# else
	__asm__ ("mov %%gs:0, %0" : "=r" (__result));
# endif
	return __result;
}
#endif /* !GCC 11 */

#ifdef __cplusplus
}
#endif

#endif

Annotation

• Immediate include surface: `features.h`.
• Atlas domain: Support Tooling And Documentation / tools.
• 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.