script/perf-read-aux.bash

#! /bin/bash
#
# Copyright (c) 2015-2021, Intel Corporation
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set -e

prog=`basename $0`

usage() {
    cat <<EOF
usage: $prog [<options>] <perf.data-file>

Extract the raw AUX area from a perf data file.

options:
  -h  this text
  -d  print commands, don't execute them

<perf.data-file> defaults to perf.data.
EOF
}

dry_run=0
while getopts "hd" opt; do
    case $opt in
        h)
            usage
            exit 0
            ;;
        d)
            dry_run=1
            ;;
    esac
done

shift $(($OPTIND-1))


if [[ $# == 0 ]]; then
    file="perf.data"
elif [[ $# == 1 ]]; then
    file="$1"
    shift
else
    usage
    exit 1
fi


if [[ "$dry_run" == 0 ]]; then
    nofiles=0

    for ofile in $file-aux-idx*.bin; do
        if [[ -w $ofile ]]; then
            echo "$prog: $ofile is in the way."
            nofiles+=1
        fi
    done

    if [[ "$nofiles" > 0 ]]; then
        exit 1
    fi
fi


perf script --no-itrace -i "$file" -D | gawk -F' ' -- '
  /PERF_RECORD_AUXTRACE / {
    offset = strtonum($1)
    hsize  = strtonum(substr($2, 2))
    size   = strtonum($5)
    idx    = strtonum($11)

    ofile = sprintf("%s-aux-idx%d.bin", file, idx)
    begin = offset + hsize

    cmd = sprintf("dd if=%s of=%s conv=notrunc oflag=append ibs=1 skip=%d " \
                  "count=%d status=none", file, ofile, begin, size)

    if (dry_run != 0) {
      print cmd
    }
    else {
      system(cmd)
    }
  }
' file="$file" dry_run="$dry_run"