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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Correlating ThinLTO-promoted locals requires demangling the .llvm.<hash>
# suffix, and the resulting klp relocation must name the original symbol: that
# is the one in the running kernel's kallsyms.
. "$(dirname "$0")/../lib.sh"
setup
clang_only "ThinLTO requires clang"
find_thinlto_toolchain ||
probe_skip "no matching clang/lld pair for a ThinLTO link; set THIN_LD to one"
build_thinlto() # $1 output object, $2 extra flags
{
$THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 \
-c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_a.o" 2>/dev/null || return 1
$THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 -DTU_B \
-c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_b.o" 2>/dev/null || return 1
"$THIN_LD" -r "$workdir/tu_a.o" "$workdir/tu_b.o" -o "$1" 2>/dev/null || return 1
}
build_thinlto "$workdir/orig.o" "" ||
probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)"
build_thinlto "$workdir/patched.o" -DPATCHED ||
probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)"
orig_sym="$(in_symbols orig.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)"
new_sym="$( in_symbols patched.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)"
[ -n "$orig_sym" ] && [ -n "$new_sym" ] ||
probe_skip "$THIN_CC did not promote the local symbol"
# Equal hashes would make plain name matching work, testing nothing.
[ "$orig_sym" != "$new_sym" ] ||
probe_skip "$THIN_CC gave the same ThinLTO hash for both builds"
run_diff
assert_patched target
out_symbols | grep -q "\.klp\.sym\.vmlinux\.$orig_sym," ||
fail "expected a klp relocation naming $orig_sym"
out_symbols | grep -q "\.klp\.sym\.vmlinux\.$new_sym," &&
fail "klp relocation names $new_sym, which the running kernel does not have"
pass "ThinLTO-mangled local correlated across differing hashes ($THIN_CC, $THIN_LD)"
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