diff options
Diffstat (limited to 'sysdeps/i386')
-rw-r--r-- | sysdeps/i386/Makefile | 14 | ||||
-rwxr-xr-x | sysdeps/i386/tst-ld-sse-use.sh | 103 |
2 files changed, 117 insertions, 0 deletions
diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile index 717d8e7454..168512fc32 100644 --- a/sysdeps/i386/Makefile +++ b/sysdeps/i386/Makefile @@ -83,3 +83,17 @@ endif ifeq ($(subdir),csu) gen-as-const-headers += tlsdesc.sym endif + +ifeq ($(subdir),elf) +# Make sure no code in ld.so uses mm/xmm/ymm/zmm registers on i386 since +# the first 3 mm/xmm/ymm/zmm registers are used to pass vector parameters +# which must be preserved. +CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\ + -mno-sse -mno-mmx) + +tests-special += $(objpfx)tst-ld-sse-use.out +$(objpfx)tst-ld-sse-use.out: ../sysdeps/i386/tst-ld-sse-use.sh $(objpfx)ld.so + @echo "Checking ld.so for SSE register use. This will take a few seconds..." + $(BASH) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@; \ + $(evaluate-test) +endif diff --git a/sysdeps/i386/tst-ld-sse-use.sh b/sysdeps/i386/tst-ld-sse-use.sh new file mode 100755 index 0000000000..85a06510b9 --- /dev/null +++ b/sysdeps/i386/tst-ld-sse-use.sh @@ -0,0 +1,103 @@ +#! /bin/bash +# Make sure no code in ld.so uses xmm/ymm/zmm registers on i386. +# 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 |