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#!/bin/sh
# relro_test.sh -- test -z relro
# Copyright (C) 2010-2018 Free Software Foundation, Inc.
# Written by Cary Coutant <ccoutant@google.com>.
# This file is part of gold.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program 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 General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
# This test checks that the PT_GNU_RELRO segment is properly
# aligned and is coincident with the beginning of the data segment.
# Cleans a hexadecimal number for input to dc.
clean_hex()
{
echo "$1" | sed -e 's/0x//' -e 'y/abcdef/ABCDEF/'
}
check()
{
# Get the address and length of the PT_GNU_RELRO segment.
RELRO_START=`grep GNU_RELRO "$1" | awk '{ print $3; }'`
RELRO_LEN=`grep GNU_RELRO "$1" | awk '{ print $6; }'`
if test -z "$RELRO_START"
then
echo "Did not find a PT_GNU_RELRO segment."
exit 1
fi
# Get the address and alignment of the PT_LOAD segment whose address
# matches the PT_GNU_RELRO segment.
LOAD_ALIGN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $NF; }'`
LOAD_LEN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $6; }'`
if test -z "$LOAD_LEN"
then
echo "Did not find a PT_LOAD segment matching the PT_GNU_RELRO segment."
exit 1
fi
# Compute the address of the end of the PT_GNU_RELRO segment,
# modulo the alignment of the PT_LOAD segment.
RELRO_START=`clean_hex "$RELRO_START"`
RELRO_LEN=`clean_hex "$RELRO_LEN"`
LOAD_ALIGN=`clean_hex "$LOAD_ALIGN"`
RELRO_END=`echo "16o 16i $RELRO_START $RELRO_LEN + p" | dc`
REM=`echo "16i $RELRO_END $LOAD_ALIGN % p" | dc`
if test "$REM" -eq 0; then
:
else
echo "PT_GNU_RELRO segment does not end at page boundary."
exit 1
fi
}
check relro_test.stdout
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