Root/arch/s390/kernel/vdso64/clock_getres.S

1/*
2 * Userland implementation of clock_getres() for 64 bits processes in a
3 * s390 kernel for use in the vDSO
4 *
5 * Copyright IBM Corp. 2008
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License (version 2 only)
10 * as published by the Free Software Foundation.
11 */
12#include <asm/vdso.h>
13#include <asm/asm-offsets.h>
14#include <asm/unistd.h>
15
16    .text
17    .align 4
18    .globl __kernel_clock_getres
19    .type __kernel_clock_getres,@function
20__kernel_clock_getres:
21    .cfi_startproc
22    cghi %r2,__CLOCK_REALTIME
23    je 0f
24    cghi %r2,__CLOCK_MONOTONIC
25    je 0f
26    cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */
27    jne 2f
28    larl %r5,_vdso_data
29    icm %r0,15,__LC_ECTG_OK(%r5)
30    jz 2f
310: ltgr %r3,%r3
32    jz 1f /* res == NULL */
33    larl %r1,3f
34    lg %r0,0(%r1)
35    xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
36    stg %r0,8(%r3) /* store tp->tv_usec */
371: lghi %r2,0
38    br %r14
392: lghi %r1,__NR_clock_getres /* fallback to svc */
40    svc 0
41    br %r14
423: .quad __CLOCK_REALTIME_RES
43    .cfi_endproc
44    .size __kernel_clock_getres,.-__kernel_clock_getres
45

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