arch/sh/kernel/vsyscall/vsyscall-trapa.S

File Facts

System

Linux kernel

Corpus path

arch/sh/kernel/vsyscall/vsyscall-trapa.S

Extension

.S

Size

1121 bytes

Lines

41

Domain

Architecture Layer

Bucket

arch/sh

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

• vsyscall-sigreturn.S

Detected Declarations

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

Annotated Snippet

.text
	.globl __kernel_vsyscall
	.type __kernel_vsyscall,@function
__kernel_vsyscall:
.LSTART_vsyscall:
	trapa	#0x10
	 nop
.LEND_vsyscall:
	.size __kernel_vsyscall,.-.LSTART_vsyscall
	.previous

	.section .eh_frame,"a",@progbits
.LCIE:
	.ualong	.LCIE_end - .LCIE_start
.LCIE_start:
	.ualong	0		/* CIE ID */
	.byte	0x1		/* Version number */
	.string	"zR"		/* NUL-terminated augmentation string */
	.uleb128 0x1		/* Code alignment factor */
	.sleb128 -4		/* Data alignment factor */
	.byte	0x11		/* Return address register column */
	.uleb128 0x1		/* Augmentation length and data */
	.byte 0x1b              /* DW_EH_PE_pcrel | DW_EH_PE_sdata4. */
	.byte	0xc,0xf,0x0	/* DW_CFA_def_cfa: r15 ofs 0 */
	.align 2
.LCIE_end:

	.ualong	.LFDE_end-.LFDE_start	/* Length FDE */
.LFDE_start:
	.ualong	.LFDE_start-.LCIE	/* CIE pointer */
	.ualong	.LSTART_vsyscall-.	/* PC-relative start address */
	.ualong	.LEND_vsyscall-.LSTART_vsyscall
	.uleb128 0			/* Augmentation */
	.align 2
.LFDE_end:
	.previous

/* Get the common code for the sigreturn entry points */
#include "vsyscall-sigreturn.S"

Annotation

• Immediate include surface: `vsyscall-sigreturn.S`.
• Atlas domain: Architecture Layer / arch/sh.
• 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.