arch/powerpc/lib/memcmp_32.S

File Facts

System

Linux kernel

Corpus path

arch/powerpc/lib/memcmp_32.S

Extension

.S

Size

627 bytes

Lines

46

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

• linux/export.h
• asm/ppc_asm.h

Detected Declarations

• export memcmp

Annotated Snippet

#include <linux/export.h>
#include <asm/ppc_asm.h>

	.text

_GLOBAL(memcmp)
	srawi.	r7, r5, 2		/* Divide len by 4 */
	mr	r6, r3
	beq-	3f
	mtctr	r7
	li	r7, 0
1:	lwzx	r3, r6, r7
	lwzx	r0, r4, r7
	addi	r7, r7, 4
	cmplw	cr0, r3, r0
	bdnzt	eq, 1b
	bne	5f
3:	andi.	r3, r5, 3
	beqlr
	cmplwi	cr1, r3, 2
	blt-	cr1, 4f
	lhzx	r3, r6, r7
	lhzx	r0, r4, r7
	addi	r7, r7, 2
	subf.	r3, r0, r3
	beqlr	cr1
	bnelr
4:	lbzx	r3, r6, r7
	lbzx	r0, r4, r7
	subf.	r3, r0, r3
	blr
5:	li	r3, 1
	bgtlr
	li	r3, -1
	blr
EXPORT_SYMBOL(memcmp)

Annotation

• Immediate include surface: `linux/export.h`, `asm/ppc_asm.h`.
• Detected declarations: `export memcmp`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: integration 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.