first version of script to detect FLP assembled instructions in the executable

#!/usr/bin/env bash

#

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# fp_insn_finder.sh

# Usage: ./find_fp_insn.sh <executable>

# disassembles executable, lists common floating-point instructions

set -euo pipefail

if [ $# -ne 1 ]; then

  echo "Usage: $0 <executable>"

  echo "Find floating-point instructions in an executable based on assembler instructions"

  echo "Pre-requisites: Perl or gawk"

  exit 1

fi

EXE="$1"

if [ ! -x "$EXE" ]; then

  echo "Error: '$EXE' is no executable"

  exit 2

fi

perl_avail=0

# check, whether we have perl installed

if command -v perl >/dev/null 2>&1; then

  perl_avail=1

fi

gawk_avail=0

awk_option=""

# check, whether we have awk (POSIX) or gawk (GNU) on the system

if command -v gawk >/dev/null 2>&1; then

    gawk_avail=1

    awk_option="--posix"

fi

if [ $perl_avail -ne 0 ]; then

    objdump -d -Mintel "$EXE" \

    | perl -nE '

    # Regex for floating-point instructions

    our $fp = qr/\b(?:fadd|fsub|fmul|fdiv|fld|fst|movss|movsd|addss|addsd|subss|subsd|mulss|mulsd|divss|divsd)\b/;

    if    (/^[0-9a-f]+ <([^>]+)>:/) { $func = $1 }

    elsif (/$fp/)                   { say "$func: $_" }

    '

else

    objdump -d -Mintel "$EXE" |

    awk ${awk_option} '

    /^[0-9a-f]+ </ {

        # Extract function names

        sub(/^[0-9a-f]+ </, "")

        sub(/>:.*$/, "")

        func = $0

        next

    }

    /(^|[^[:alnum:]_])(fadd|fsub|fmul|fdiv|fld|fst|movss|movsd|addss|addsd|subss|subsd|mulss|mulsd|divss|divsd)($|[^[:alnum:]_])/ {

        print func ": " $0

    }

    '

fi