arch/x86/um/shared/sysdep/ptrace_user.h

File Facts

System

Linux kernel

Corpus path

arch/x86/um/shared/sysdep/ptrace_user.h

Extension

.h

Size

553 bytes

Lines

21

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

• generated/user_constants.h

Detected Declarations

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

Annotated Snippet

#include <generated/user_constants.h>

#define PT_OFFSET(r) ((r) * sizeof(long))

#define PT_SYSCALL_NR(regs) ((regs)[HOST_ORIG_AX])
#define PT_SYSCALL_NR_OFFSET PT_OFFSET(HOST_ORIG_AX)

#define PT_SYSCALL_RET_OFFSET PT_OFFSET(HOST_AX)

#define REGS_IP_INDEX HOST_IP
#define REGS_SP_INDEX HOST_SP

/*
 * glibc before 2.27 does not include PTRACE_SYSEMU_SINGLESTEP in its enum,
 * ensure we have a definition by (re-)defining it here.
 */
#ifndef PTRACE_SYSEMU_SINGLESTEP
#define PTRACE_SYSEMU_SINGLESTEP 32
#endif

Annotation

• Immediate include surface: `generated/user_constants.h`.
• 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.