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