55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
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#!/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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