blob: 176e1f75f9aa6c1554dbf0818b7d4cd6661c0846 [file] [log] [blame]
* Userland implementation of clock_getres() for 64 bits processes in a
* s390 kernel for use in the vDSO
* Copyright IBM Corp. 2008
* Author(s): Martin Schwidefsky (
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
* as published by the Free Software Foundation.
#include <asm/vdso.h>
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
.align 4
.globl __kernel_clock_getres
.type __kernel_clock_getres,@function
je 0f
je 0f
cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */
jne 2f
larl %r5,_vdso_data
icm %r0,15,__LC_ECTG_OK(%r5)
jz 2f
0: ltgr %r3,%r3
jz 1f /* res == NULL */
larl %r1,3f
lg %r0,0(%r1)
xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
stg %r0,8(%r3) /* store tp->tv_usec */
1: lghi %r2,0
br %r14
2: lghi %r1,__NR_clock_getres /* fallback to svc */
svc 0
br %r14
.size __kernel_clock_getres,.-__kernel_clock_getres