sysdeps/i386/tst-ld-sse-use.sh

   1 #!/bin/bash
   2 # Make sure no code in ld.so uses xmm/ymm/zmm registers on i386.
   3 # Copyright (C) 2009-2017 Free Software Foundation, Inc.
   4 # This file is part of the GNU C Library.
   5
   6 # The GNU C Library is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU Lesser General Public
   8 # License as published by the Free Software Foundation; either
   9 # version 2.1 of the License, or (at your option) any later version.
  10
  11 # The GNU C Library is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # Lesser General Public License for more details.
  15
  16 # You should have received a copy of the GNU Lesser General Public
  17 # License along with the GNU C Library; if not, see
  18 # <http://www.gnu.org/licenses/>.
  19
  20 set -e
  21
  22 objpfx="$1"
  23 NM="$2"
  24 OBJDUMP="$3"
  25 READELF="$4"
  26
  27 tmp=$(mktemp ${objpfx}tst-ld-sse-use.XXXXXX)
  28 trap 'rm -f "$tmp"' 1 2 3 15
  29
  30 # List of object files we have to test
  31 rtldobjs=$($READELF -W -wi ${objpfx}dl-allobjs.os |
  32     awk '/^ </ { if ($5 == "(DW_TAG_compile_unit)") c=1; else c=0 } $2 == "DW_AT_name" { if (c == 1) print $NF }' |
  33     sed 's,\(.*/\|\)\([_[:alnum:]-]*[.]\).$,\2os,')
  34 rtldobjs="$rtldobjs $(ar t ${objpfx}rtld-libc.a)"
  35
  36 # OBJECT symbols can be ignored.
  37 $READELF -sW ${objpfx}dl-allobjs.os ${objpfx}rtld-libc.a |
  38 egrep " OBJECT  *GLOBAL " |
  39 awk '{if ($7 != "ABS") print $8 }' |
  40 sort -u > "$tmp"
  41 declare -a objects
  42 objects=($(cat "$tmp"))
  43
  44 objs="dl-runtime.os"
  45 tocheck="dl-runtime.os"
  46
  47 while test -n "$objs"; do
  48   this="$objs"
  49   objs=""
  50
  51   for f in $this; do
  52     undef=$($NM -u "$objpfx"../*/"$f" | awk '{print $2}')
  53     if test -n "$undef"; then
  54       for s in $undef; do
  55         for obj in ${objects[*]} "_GLOBAL_OFFSET_TABLE_"; do
  56           if test "$obj" = "$s"; then
  57             continue 2
  58           fi
  59         done
  60         for o in $rtldobjs; do
  61           ro=$(echo "$objpfx"../*/"$o")
  62           if $NM -g --defined-only "$ro" | egrep -qs " $s\$"; then
  63             if ! (echo "$tocheck $objs" | fgrep -qs "$o"); then
  64               echo "$o needed for $s"
  65               objs="$objs $o"
  66             fi
  67             break;
  68           fi
  69         done
  70       done
  71     fi
  72   done
  73   tocheck="$tocheck$objs"
  74 done
  75
  76 echo
  77 echo
  78 echo "object files needed: $tocheck"
  79
  80 cp /dev/null "$tmp"
  81 for f in $tocheck; do
  82   $OBJDUMP -d "$objpfx"../*/"$f" |
  83   awk 'BEGIN { last="" } /^[[:xdigit:]]* <[_[:alnum:]]*>:$/ { fct=substr($2, 2, length($2)-3) } /,%[xyz]mm[[:digit:]]*$/ { if (last != fct) { print fct; last=fct} }' |
  84   while read fct; do
  85     if test "$fct" = "_dl_runtime_profile" -o "$fct" = "_dl_x86_64_restore_sse"; then
  86       continue;
  87     fi
  88     echo "function $fct in $f modifies xmm/ymm/zmm" >> "$tmp"
  89     result=1
  90   done
  91 done
  92
  93 if test -s "$tmp"; then
  94   echo
  95   echo
  96   cat "$tmp"
  97   result=1
  98 else
  99   result=0
 100 fi
 101
 102 rm "$tmp"
 103 exit $result