arch/sparc/lib/NG2copy_to_user.S

File Facts

System

Linux kernel

Corpus path

arch/sparc/lib/NG2copy_to_user.S

Extension

.S

Size

1109 bytes

Lines

54

Domain

Architecture Layer

Bucket

arch/sparc

Inferred role

Architecture Layer: arch/sparc

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.

Dependency Surface

• NG2memcpy.S

Detected Declarations

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

Annotated Snippet

#define EX_ST(x,y)		\
98:	x;			\
	.section __ex_table,"a";\
	.align 4;		\
	.word 98b, y;		\
	.text;			\
	.align 4;

#define EX_ST_FP(x,y)		\
98:	x;			\
	.section __ex_table,"a";\
	.align 4;		\
	.word 98b, y##_fp;	\
	.text;			\
	.align 4;

#ifndef ASI_AIUS
#define ASI_AIUS	0x11
#endif

#ifndef ASI_BLK_AIUS_4V
#define ASI_BLK_AIUS_4V	0x17
#endif

#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
#endif

#define FUNC_NAME		NG2copy_to_user
#define STORE(type,src,addr)	type##a src, [addr] ASI_AIUS
#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS
#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_AIUS_4V
#define EX_RETVAL(x)		0

#ifdef __KERNEL__
	/* Writing to %asi is _expensive_ so we hardcode it.
	 * Reading %asi to check for KERNEL_DS is comparatively
	 * cheap.
	 */
#define PREAMBLE					\
	rd		%asi, %g1;			\
	cmp		%g1, ASI_AIUS;			\
	bne,pn		%icc, raw_copy_in_user;		\
	 nop
#endif

#include "NG2memcpy.S"

Annotation

• Immediate include surface: `NG2memcpy.S`.
• Atlas domain: Architecture Layer / arch/sparc.
• Implementation status: atlas-only.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.