2 files changed, 105 insertions, 0 deletions
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index f25d1e2415..086054ff09 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -1,4 +1,9 @@
 ifeq ($(subdir),elf)
 CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
 		   -mno-sse -mno-mmx)
+
+tests: $(objpfx)tst-xmmymm.out
+$(objpfx)tst-xmmymm.out: ../sysdeps/x86/tst-xmmymm.sh $(objpfx)ld.so
+	@echo "Checking ld.so for SSE register use.  This will take a few seconds..."
+	$(SHELL) $< $(objpfx) > $@
 endif
diff --git a/sysdeps/x86/tst-xmmymm.sh b/sysdeps/x86/tst-xmmymm.sh
new file mode 100755
index 0000000000..64efc6e021
--- /dev/null
+++ b/sysdeps/x86/tst-xmmymm.sh
@@ -0,0 +1,100 @@
+#! /bin/bash
+# Make sure no code in ld.so uses xmm/ymm registers on x86-64.
+# Copyright (C) 2009-2012 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="$1"
+
+tmp=$(mktemp ${objpfx}tst-xmmymm.XXXXXX)
+trap 'rm -f "$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($2)-3) } /,%[xy]mm[[:digit:]]*$/ { 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 $f modifies xmm/ymm" >> "$tmp"
+    result=1
+  done
+done
+
+if test -s "$tmp"; then
+  echo
+  echo
+  cat "$tmp"
+  result=1
+else
+  result=0
+fi
+
+rm "$tmp"
+exit $result