/* SPDX-License-Identifier: GPL-2.0 */ /* * 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 (schwidefsky@de.ibm.com) */ #include #include #include .text .align 4 .globl __kernel_clock_getres .type __kernel_clock_getres,@function __kernel_clock_getres: .cfi_startproc larl %r1,4f cghi %r2,__CLOCK_REALTIME_COARSE je 0f cghi %r2,__CLOCK_MONOTONIC_COARSE je 0f larl %r1,3f cghi %r2,__CLOCK_REALTIME je 0f cghi %r2,__CLOCK_MONOTONIC je 0f cghi %r2,__CLOCK_THREAD_CPUTIME_ID je 0f cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */ jne 2f larl %r5,_vdso_data icm %r0,15,__LC_ECTG_OK(%r5) jz 2f 0: ltgr %r3,%r3 jz 1f /* res == NULL */ 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 3: .quad __CLOCK_REALTIME_RES 4: .quad __CLOCK_COARSE_RES .cfi_endproc .size __kernel_clock_getres,.-__kernel_clock_getres