tools/testing/selftests/powerpc/switch_endian/check.S

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/powerpc/switch_endian/check.S

Extension

.S

Size

1977 bytes

Lines

102

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: tools

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• common.h

Detected Declarations

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

Annotated Snippet

#include "common.h"

/*
 * Checks that registers contain what we expect, ie. they were not clobbered by
 * the syscall.
 *
 * r15: pattern to check registers against.
 *
 * At the end r3 == 0 if everything's OK.
 */
	nop			# guaranteed to be illegal in reverse-endian
	mr	r9,r15
	cmpd    r9,r3		# check r3
	bne     1f
	addi    r9,r15,4	# check r4
	cmpd    r9,r4
	bne     1f
	lis     r9,0x00FF	# check CR
	ori     r9,r9,0xF000
	mfcr    r10
	and     r10,r10,r9
	cmpw    r9,r10
	addi    r9,r15,34
	bne     1f
	addi    r9,r15,32	# check LR
	mflr    r10
	cmpd    r9,r10
	bne     1f
	addi    r9,r15,5	# check r5
	cmpd    r9,r5
	bne     1f
	addi    r9,r15,6	# check r6
	cmpd    r9,r6
	bne     1f
	addi    r9,r15,7	# check r7
	cmpd    r9,r7
	bne     1f
	addi    r9,r15,8	# check r8
	cmpd    r9,r8
	bne     1f
	addi    r9,r15,13	# check r13
	cmpd    r9,r13
	bne     1f
	addi    r9,r15,14	# check r14
	cmpd    r9,r14
	bne     1f
	addi    r9,r15,16	# check r16
	cmpd    r9,r16
	bne     1f
	addi    r9,r15,17	# check r17
	cmpd    r9,r17
	bne     1f
	addi    r9,r15,18	# check r18
	cmpd    r9,r18
	bne     1f
	addi    r9,r15,19	# check r19
	cmpd    r9,r19
	bne     1f
	addi    r9,r15,20	# check r20
	cmpd    r9,r20
	bne     1f
	addi    r9,r15,21	# check r21
	cmpd    r9,r21
	bne     1f
	addi    r9,r15,22	# check r22
	cmpd    r9,r22
	bne     1f
	addi    r9,r15,23	# check r23
	cmpd    r9,r23
	bne     1f

Annotation

• Immediate include surface: `common.h`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: atlas-only.

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.