1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Userland implementation of getcpu() for 32 bits processes in a
 4 * s390 kernel for use in the vDSO
 5 *
 6 *  Copyright IBM Corp. 2016
 7 *  Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 8 */
 9#include <asm/vdso.h>
10#include <asm/asm-offsets.h>
11#include <asm/dwarf.h>
12
13	.text
14	.align 4
15	.globl __kernel_getcpu
16	.type  __kernel_getcpu,@function
17__kernel_getcpu:
18	CFI_STARTPROC
19	la	%r4,0
20	sacf	256
21	l	%r5,__VDSO_CPU_NR(%r4)
22	l	%r4,__VDSO_NODE_ID(%r4)
23	sacf	0
24	ltr	%r2,%r2
25	jz	2f
26	st	%r5,0(%r2)
272:	ltr	%r3,%r3
28	jz	3f
29	st	%r4,0(%r3)
303:	lhi	%r2,0
31	br	%r14
32	CFI_ENDPROC
33	.size	__kernel_getcpu,.-__kernel_getcpu