Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #!/bin/sh |
b2441318 | 2 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
3 | # |
4 | # Check whether linker can handle cross-segment @segrel(): | |
5 | # | |
6 | CPPFLAGS="" | |
7 | CC=$1 | |
8 | OBJDUMP=$2 | |
9 | READELF=$3 | |
10 | dir=$(dirname $0) | |
11 | tmp=${TMPDIR:-/tmp} | |
12 | out=$tmp/out$$ | |
13 | ||
14 | # Check whether cross-segment segment-relative relocs work fine. We need | |
15 | # that for building the gate DSO: | |
16 | ||
17 | $CC -nostdlib -static -Wl,-T$dir/check-segrel.lds $dir/check-segrel.S -o $out | |
18 | res=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ') | |
19 | rm -f $out | |
20 | if [ $res != 00000a00 ]; then | |
21 | CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" | |
22 | cat >&2 <<EOF | |
23 | warning: your linker cannot handle cross-segment segment-relative relocations. | |
24 | please upgrade to a newer version (it is safe to use this linker, but | |
25 | the kernel will be bigger than strictly necessary). | |
26 | EOF | |
27 | fi | |
28 | ||
29 | # Check whether .align inside a function works as expected. | |
30 | ||
31 | $CC -c $dir/check-text-align.S -o $out | |
32 | $READELF -u $out | fgrep -q 'prologue(rlen=12)' | |
33 | res=$? | |
34 | rm -f $out | |
35 | if [ $res -eq 0 ]; then | |
36 | CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" | |
37 | fi | |
38 | ||
39 | if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib | |
40 | then | |
41 | CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" | |
42 | fi | |
43 | rm -f $out | |
44 | ||
45 | # Check whether assembler supports .serialize.{data,instruction} directive. | |
46 | ||
47 | $CC -c $dir/check-serialize.S -o $out 2>/dev/null | |
48 | res=$? | |
49 | rm -f $out | |
50 | if [ $res -eq 0 ]; then | |
51 | CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" | |
52 | fi | |
53 | ||
54 | echo $CPPFLAGS |