From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/s390/kernel/vdso32/clock_getres.S | 46 ++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 arch/s390/kernel/vdso32/clock_getres.S (limited to 'arch/s390/kernel/vdso32/clock_getres.S') diff --git a/arch/s390/kernel/vdso32/clock_getres.S b/arch/s390/kernel/vdso32/clock_getres.S new file mode 100644 index 000000000..eca3f001f --- /dev/null +++ b/arch/s390/kernel/vdso32/clock_getres.S @@ -0,0 +1,46 @@ +/* + * Userland implementation of clock_getres() for 32 bits processes in a + * s390 kernel for use in the vDSO + * + * Copyright IBM Corp. 2008 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * 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 +#include +#include + + .text + .align 4 + .globl __kernel_clock_getres + .type __kernel_clock_getres,@function +__kernel_clock_getres: + .cfi_startproc + basr %r1,0 + la %r1,4f-.(%r1) + chi %r2,__CLOCK_REALTIME + je 0f + chi %r2,__CLOCK_MONOTONIC + je 0f + la %r1,5f-4f(%r1) + chi %r2,__CLOCK_REALTIME_COARSE + je 0f + chi %r2,__CLOCK_MONOTONIC_COARSE + jne 3f +0: ltr %r3,%r3 + jz 2f /* res == NULL */ +1: l %r0,0(%r1) + xc 0(4,%r3),0(%r3) /* set tp->tv_sec to zero */ + st %r0,4(%r3) /* store tp->tv_usec */ +2: lhi %r2,0 + br %r14 +3: lhi %r1,__NR_clock_getres /* fallback to svc */ + svc 0 + br %r14 +4: .long __CLOCK_REALTIME_RES +5: .long __CLOCK_COARSE_RES + .cfi_endproc + .size __kernel_clock_getres,.-__kernel_clock_getres -- cgit v1.2.3-54-g00ecf