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authordeep-42-thought <github@eckner.net>2018-01-19 22:57:06 +0100
committerGitHub <noreply@github.com>2018-01-19 22:57:06 +0100
commit289131e5c9f58d8f9db3d7bf77c9de5452c198ca (patch)
tree46c593f43a8229d170c1ea23b49787a36aa80fd4 /bin/check-opcodes
parent473118c413fad4050edcbd5e36e59de8a899f342 (diff)
parent5e93dd3896ab214fda599775efb0e97df5c6ab7b (diff)
Merge pull request #2 from andreasbaumann/opcodes
added a preliminary opcode sniffer
Diffstat (limited to 'bin/check-opcodes')
-rwxr-xr-xbin/check-opcodes166
1 files changed, 166 insertions, 0 deletions
diff --git a/bin/check-opcodes b/bin/check-opcodes
new file mode 100755
index 0000000..fd740b1
--- /dev/null
+++ b/bin/check-opcodes
@@ -0,0 +1,166 @@
+#!/bin/sh
+
+. "${0%/*}/../conf/default.conf"
+
+usage( ) {
+ >&2 cat <<EOF
+
+check_opcodes: [ -a <arch> ] <package>
+
+possible optons:
+ -h|--help: Show this help page
+ -v|--verbose: Verbose output
+ -a|--architecture: architecture family to check against, one of
+ i486, i686, pentium4
+
+EOF
+ exit 1
+}
+
+VERBOSE=0
+EXIT_CODE=0
+log( ) {
+ if test $VERBOSE = 1; then
+ echo $*
+ fi
+}
+
+err( ) {
+ echo "ERROR: $*"
+ EXIT_CODE=1
+}
+
+tmp_dir=$(mktemp -d "${work_dir}/tmp.check-opcodes.XXXXXX")
+trap "rm -rf --one-file-system '${tmp_dir:?}'" EXIT
+
+ARCH=i686
+
+while getopts ":va:h-:" opt; do
+ case $opt in
+ -)
+ case "$OPTARG" in
+ help)
+ usage
+ ;;
+ verbose)
+ VERBOSE=1
+ ;;
+ *)
+ echo "ERROR: Invalid option: --$OPTARG" >&2
+ usage
+ ;;
+ esac
+ ;;
+ h)
+ usage
+ ;;
+ v)
+ VERBOSE=1
+ ;;
+ a)
+ ARCH=$OPTARG
+ ;;
+ \?)
+ echo "ERROR: Invalid option: -$OPTARG" >&2
+ usage
+ ;;
+ esac
+done
+
+shift $((OPTIND-1))
+
+PACKAGE=$1
+
+if test "x$PACKAGE" = "x"; then
+ echo "ERROR: Filename of a package required as argument" >&2
+ usage
+ exit 1
+fi
+
+OPCODE_ARGS=""
+case $ARCH in
+ i486)
+ OPCODE_ARGS='-r -a 486 -v'
+ ;;
+ i686)
+ OPCODE_ARGS='-s MMX -s SSE -s SSE2'
+ ;;
+ pentium4)
+ OPCODE_ARGS='-s SSE3 -s SSSE3 -s AVX'
+ ;;
+ *)
+ echo "ERROR: architecture must currently be one of i486 and i686" >&2
+ usage
+ exit 1
+esac
+
+log "Checking for architecture: $ARCH ($OPCODE_ARGS)"
+bsdtar --no-fflags -x -C $tmp_dir -f $PACKAGE
+
+for absfile in `find $tmp_dir -name '*.so*' -type f`; do
+ file=`basename $absfile`
+ log "Checking shared library: $file"
+ readelf -a $absfile > $tmp_dir/$file.elf
+ objdump -f $absfile > $tmp_dir/$file.objdump
+ file $absfile > $tmp_dir/$file.file
+
+ arch=`grep ^architecture $tmp_dir/$file.objdump | sed 's/^architecture: //g' | cut -f 1 -d ,`
+ case $arch in
+ i386:x86-64)
+ arch='x86_64'
+ ;;
+ i386)
+ arch='x86'
+ ;;
+ *)
+ arch='unknown'
+ ;;
+ esac
+ log " Objdump architecture: $arch"
+
+ archelf=`grep '^ \+Class' $tmp_dir/$file.elf | cut -f 2 -d : | tr -d ' '`
+ case $archelf in
+ ELF64)
+ archelf='x86_64'
+ ;;
+ ELF32)
+ archelf='x86'
+ ;;
+ *)
+ archelf='unknown'
+ ;;
+ esac
+ log " Readelf architecture: $archelf"
+
+ if test $arch != $archelf; then
+ err "$file ambigous architecture information (objdump: $arch, ELF: $archelf)"
+ fi
+
+ if test $arch = "x86_64"; then
+ err "$file is a 64-bit library!"
+ continue
+ fi
+
+ objdump -M intel -d $absfile > $tmp_dir/$file.asm
+ bad_opcodes=`cat $tmp_dir/$file.asm | ${base_dir}/bin/opcode $OPCODE_ARGS -m 1 | wc -l`
+ if test $bad_opcodes != 0; then
+ case $ARCH in
+ i486)
+ err "$file is not built for plain i486 opcodes"
+ ;;
+ i686)
+ err "$file contains MMX, SSE or SSE2 opcodes"
+ ;;
+ pentium4)
+ err "$file contains SSE3 or newer opcodes"
+ ;;
+ esac
+ else
+ if test $VERBOSE = 1; then
+ log "$file fullfills architecture constraint for $ARCH"
+ fi
+ fi
+
+done
+
+exit $EXIT_CODE