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#! /bin/bash
# Make sure no code in ld.so uses xmm/ymm/zmm registers on x86-64.
# Copyright (C) 2009-2015 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.
set -e
objpfx="$1"
NM="$2"
OBJDUMP="$3"
READELF="$4"
tmp=$(mktemp ${objpfx}tst-ld-sse-use.XXXXXX)
trap 'rm -f "$tmp"' 1 2 3 15
# List of object files we have to test
rtldobjs=$($READELF -W -wi ${objpfx}dl-allobjs.os |
awk '/^ </ { if ($5 == "(DW_TAG_compile_unit)") c=1; else c=0 } $2 == "DW_AT_name" { if (c == 1) print $NF }' |
sed 's,\(.*/\|\)\([_[:alnum:]-]*[.]\).$,\2os,')
rtldobjs="$rtldobjs $(ar t ${objpfx}rtld-libc.a)"
# OBJECT symbols can be ignored.
$READELF -sW ${objpfx}dl-allobjs.os ${objpfx}rtld-libc.a |
egrep " OBJECT *GLOBAL " |
awk '{if ($7 != "ABS") print $8 }' |
sort -u > "$tmp"
declare -a objects
objects=($(cat "$tmp"))
objs="dl-runtime.os"
tocheck="dl-runtime.os"
while test -n "$objs"; do
this="$objs"
objs=""
for f in $this; do
undef=$($NM -u "$objpfx"../*/"$f" | awk '{print $2}')
if test -n "$undef"; then
for s in $undef; do
for obj in ${objects[*]} "_GLOBAL_OFFSET_TABLE_"; do
if test "$obj" = "$s"; then
continue 2
fi
done
for o in $rtldobjs; do
ro=$(echo "$objpfx"../*/"$o")
if $NM -g --defined-only "$ro" | egrep -qs " $s\$"; then
if ! (echo "$tocheck $objs" | fgrep -qs "$o"); then
echo "$o needed for $s"
objs="$objs $o"
fi
break;
fi
done
done
fi
done
tocheck="$tocheck$objs"
done
echo
echo
echo "object files needed: $tocheck"
cp /dev/null "$tmp"
for f in $tocheck; do
$OBJDUMP -d "$objpfx"../*/"$f" |
awk 'BEGIN { last="" } /^[[:xdigit:]]* <[_[:alnum:]]*>:$/ { fct=substr($2, 2, length($2)-3) } /,%[xyz]mm[[:digit:]]*$/ { if (last != fct) { print fct; last=fct} }' |
while read fct; do
if test "$fct" = "_dl_runtime_profile" -o "$fct" = "_dl_x86_64_restore_sse"; then
continue;
fi
echo "function $fct in $f modifies xmm/ymm/zmm" >> "$tmp"
result=1
done
done
if test -s "$tmp"; then
echo
echo
cat "$tmp"
result=1
else
result=0
fi
rm "$tmp"
exit $result
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