2008-12-25 07:38:36 -05:00
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/*
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* Userland implementation of clock_getres() for 64 bits processes in a
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* s390 kernel for use in the vDSO
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*
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* Copyright IBM Corp. 2008
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*/
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#include <asm/vdso.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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.text
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.align 4
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.globl __kernel_clock_getres
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.type __kernel_clock_getres,@function
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__kernel_clock_getres:
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.cfi_startproc
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cghi %r2,CLOCK_REALTIME
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je 0f
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cghi %r2,CLOCK_MONOTONIC
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2008-12-31 09:11:42 -05:00
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je 0f
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cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */
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2008-12-25 07:38:36 -05:00
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jne 2f
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2008-12-31 09:11:42 -05:00
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larl %r5,_vdso_data
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icm %r0,15,__LC_ECTG_OK(%r5)
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jz 2f
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2008-12-25 07:38:36 -05:00
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0: ltgr %r3,%r3
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jz 1f /* res == NULL */
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larl %r1,3f
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lg %r0,0(%r1)
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xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
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stg %r0,8(%r3) /* store tp->tv_usec */
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1: lghi %r2,0
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br %r14
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2: lghi %r1,__NR_clock_getres /* fallback to svc */
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svc 0
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br %r14
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3: .quad CLOCK_REALTIME_RES
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.cfi_endproc
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.size __kernel_clock_getres,.-__kernel_clock_getres
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