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// timestamp tapset -- gettimeofday variants
// Copyright (C) 2005-2009 Red Hat Inc.
// Copyright (C) 2006 Intel Corporation.
// Copyright (C) 2019 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
global __gtod_offset = 0 /* offset of (gettimeofday_ns() - ktime_get_ns()) */
/**
* Description: This function returns the result of system's gettimeofday_ns().
* It is only callable from systemtap's user-space bpf interpreter
* which has a function backing up this particular call number.
* Its only purpose is to provide information to compute __gtod_offset
* so the built-in ktime_get_ns() can be converted for gettimeofday_*().
*/
function __gtod_get_ns:long ()
%{ /* bpf */ /* pure */ /* unprivileged */ /* userspace */
0x85, 0, 0, 0, -4; /* call BPF_FUNC_gtod_get_ns */
0xbf, $$, 0, 0, 0 /* movx $$, r0 */
%}
probe init
{
/* compute an offset so ktime_get_ns() can be converted into gettimeofday_*() */
__gtod_offset = __gtod_get_ns() - ktime_get_ns();
}
/**
* sfunction gettimeofday_ns - Number of nanoseconds since UNIX epoch
*
* Description: This function returns the number of nanoseconds
* since the UNIX epoch.
*/
function gettimeofday_ns:long ()
{ /* pure */ /* unprivileged */
return (ktime_get_ns() + __gtod_offset)
}
/**
* sfunction gettimeofday_us - Number of microseconds since UNIX epoch
*
* Description: This function returns the number of microseconds
* since the UNIX epoch.
*/
function gettimeofday_us:long () {
return gettimeofday_ns() / 1000;
}
/**
* sfunction gettimeofday_ms - Number of milliseconds since UNIX epoch
*
* Description: This function returns the number of milliseconds
* since the UNIX epoch.
*/
function gettimeofday_ms:long () {
return gettimeofday_ns() / 1000000;
}
/**
* sfunction gettimeofday_s - Number of seconds since UNIX epoch
*
* Description: This function returns the number of seconds since
* the UNIX epoch.
*/
function gettimeofday_s:long () {
return gettimeofday_ns() / 1000000000;
}
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