cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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show_delta (3087B)


      1#!/usr/bin/env python
      2# SPDX-License-Identifier: GPL-2.0-only
      3#
      4# show_deltas: Read list of printk messages instrumented with
      5# time data, and format with time deltas.
      6#
      7# Also, you can show the times relative to a fixed point.
      8#
      9# Copyright 2003 Sony Corporation
     10#
     11
     12import sys
     13import string
     14
     15def usage():
     16	print ("""usage: show_delta [<options>] <filename>
     17
     18This program parses the output from a set of printk message lines which
     19have time data prefixed because the CONFIG_PRINTK_TIME option is set, or
     20the kernel command line option "time" is specified. When run with no
     21options, the time information is converted to show the time delta between
     22each printk line and the next.  When run with the '-b' option, all times
     23are relative to a single (base) point in time.
     24
     25Options:
     26  -h            Show this usage help.
     27  -b <base>	Specify a base for time references.
     28		<base> can be a number or a string.
     29		If it is a string, the first message line
     30		which matches (at the beginning of the
     31		line) is used as the time reference.
     32
     33ex: $ dmesg >timefile
     34    $ show_delta -b NET4 timefile
     35
     36will show times relative to the line in the kernel output
     37starting with "NET4".
     38""")
     39	sys.exit(1)
     40
     41# returns a tuple containing the seconds and text for each message line
     42# seconds is returned as a float
     43# raise an exception if no timing data was found
     44def get_time(line):
     45	if line[0]!="[":
     46		raise ValueError
     47
     48	# split on closing bracket
     49	(time_str, rest) = string.split(line[1:],']',1)
     50	time = string.atof(time_str)
     51
     52	#print "time=", time
     53	return (time, rest)
     54
     55
     56# average line looks like:
     57# [    0.084282] VFS: Mounted root (romfs filesystem) readonly
     58# time data is expressed in seconds.useconds,
     59# convert_line adds a delta for each line
     60last_time = 0.0
     61def convert_line(line, base_time):
     62	global last_time
     63
     64	try:
     65		(time, rest) = get_time(line)
     66	except:
     67		# if any problem parsing time, don't convert anything
     68		return line
     69
     70	if base_time:
     71		# show time from base
     72		delta = time - base_time
     73	else:
     74		# just show time from last line
     75		delta = time - last_time
     76		last_time = time
     77
     78	return ("[%5.6f < %5.6f >]" % (time, delta)) + rest
     79
     80def main():
     81	base_str = ""
     82	filein = ""
     83	for arg in sys.argv[1:]:
     84		if arg=="-b":
     85			base_str = sys.argv[sys.argv.index("-b")+1]
     86		elif arg=="-h":
     87			usage()
     88		else:
     89			filein = arg
     90
     91	if not filein:
     92		usage()
     93
     94	try:
     95		lines = open(filein,"r").readlines()
     96	except:
     97		print ("Problem opening file: %s" % filein)
     98		sys.exit(1)
     99
    100	if base_str:
    101		print ('base= "%s"' % base_str)
    102		# assume a numeric base.  If that fails, try searching
    103		# for a matching line.
    104		try:
    105			base_time = float(base_str)
    106		except:
    107			# search for line matching <base> string
    108			found = 0
    109			for line in lines:
    110				try:
    111					(time, rest) = get_time(line)
    112				except:
    113					continue
    114				if string.find(rest, base_str)==1:
    115					base_time = time
    116					found = 1
    117					# stop at first match
    118					break
    119			if not found:
    120				print ('Couldn\'t find line matching base pattern "%s"' % base_str)
    121				sys.exit(1)
    122	else:
    123		base_time = 0.0
    124
    125	for line in lines:
    126		print (convert_line(line, base_time),)
    127
    128main()