arch/parisc/kernel/vdso32/restart_syscall.S

File Facts

System

Linux kernel

Corpus path

arch/parisc/kernel/vdso32/restart_syscall.S

Extension

.S

Size

647 bytes

Lines

33

Domain

Architecture Layer

Bucket

arch/parisc

Inferred role

Architecture Layer: syscall or user/kernel boundary

Status

core 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.
• Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.

Dependency Surface

• asm/unistd.h
• asm/vdso.h
• linux/linkage.h

Detected Declarations

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

Annotated Snippet

#include <asm/unistd.h>
#include <asm/vdso.h>

#include <linux/linkage.h>

	.text

ENTRY_CFI(__kernel_restart_syscall)
	/*
	 * Setup a trampoline to restart the syscall
	 * with __NR_restart_syscall
	 */

	/* load return pointer */
#if defined(__VDSO64__)
	ldd	0(%sp), %r31
#elif defined(__VDSO32__)
	ldw	0(%sp), %r31
#endif

	be	0x100(%sr2, %r0)
	ldi	__NR_restart_syscall, %r20

ENDPROC_CFI(__kernel_restart_syscall)

Annotation

• Immediate include surface: `asm/unistd.h`, `asm/vdso.h`, `linux/linkage.h`.
• Atlas domain: Architecture Layer / arch/parisc.
• Implementation status: core 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.