| #!/bin/sh |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # Check whether linker can handle cross-segment @segrel(): |
| # |
| CPPFLAGS="" |
| CC=$1 |
| OBJDUMP=$2 |
| READELF=$3 |
| dir=$(dirname $0) |
| tmp=${TMPDIR:-/tmp} |
| out=$tmp/out$$ |
| |
| # Check whether cross-segment segment-relative relocs work fine. We need |
| # that for building the gate DSO: |
| |
| $CC -nostdlib -static -Wl,-T$dir/check-segrel.lds $dir/check-segrel.S -o $out |
| res=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ') |
| rm -f $out |
| if [ $res != 00000a00 ]; then |
| CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" |
| cat >&2 <<EOF |
| warning: your linker cannot handle cross-segment segment-relative relocations. |
| please upgrade to a newer version (it is safe to use this linker, but |
| the kernel will be bigger than strictly necessary). |
| EOF |
| fi |
| |
| # Check whether .align inside a function works as expected. |
| |
| $CC -c $dir/check-text-align.S -o $out |
| $READELF -u $out | fgrep -q 'prologue(rlen=12)' |
| res=$? |
| rm -f $out |
| if [ $res -eq 0 ]; then |
| CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" |
| fi |
| |
| if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib |
| then |
| CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" |
| fi |
| rm -f $out |
| |
| # Check whether assembler supports .serialize.{data,instruction} directive. |
| |
| $CC -c $dir/check-serialize.S -o $out 2>/dev/null |
| res=$? |
| rm -f $out |
| if [ $res -eq 0 ]; then |
| CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" |
| fi |
| |
| echo $CPPFLAGS |
