1*7fd24723SPuranjay Mohan#!/bin/bash 2*7fd24723SPuranjay Mohan# SPDX-License-Identifier: GPL-2.0 3*7fd24723SPuranjay Mohan# 4*7fd24723SPuranjay Mohan# Correlating ThinLTO-promoted locals requires demangling the .llvm.<hash> 5*7fd24723SPuranjay Mohan# suffix, and the resulting klp relocation must name the original symbol: that 6*7fd24723SPuranjay Mohan# is the one in the running kernel's kallsyms. 7*7fd24723SPuranjay Mohan 8*7fd24723SPuranjay Mohan. "$(dirname "$0")/../lib.sh" 9*7fd24723SPuranjay Mohan 10*7fd24723SPuranjay Mohansetup 11*7fd24723SPuranjay Mohanclang_only "ThinLTO requires clang" 12*7fd24723SPuranjay Mohan 13*7fd24723SPuranjay Mohanfind_thinlto_toolchain || 14*7fd24723SPuranjay Mohan probe_skip "no matching clang/lld pair for a ThinLTO link; set THIN_LD to one" 15*7fd24723SPuranjay Mohan 16*7fd24723SPuranjay Mohanbuild_thinlto() # $1 output object, $2 extra flags 17*7fd24723SPuranjay Mohan{ 18*7fd24723SPuranjay Mohan $THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 \ 19*7fd24723SPuranjay Mohan -c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_a.o" 2>/dev/null || return 1 20*7fd24723SPuranjay Mohan $THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 -DTU_B \ 21*7fd24723SPuranjay Mohan -c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_b.o" 2>/dev/null || return 1 22*7fd24723SPuranjay Mohan "$THIN_LD" -r "$workdir/tu_a.o" "$workdir/tu_b.o" -o "$1" 2>/dev/null || return 1 23*7fd24723SPuranjay Mohan} 24*7fd24723SPuranjay Mohan 25*7fd24723SPuranjay Mohanbuild_thinlto "$workdir/orig.o" "" || 26*7fd24723SPuranjay Mohan probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)" 27*7fd24723SPuranjay Mohanbuild_thinlto "$workdir/patched.o" -DPATCHED || 28*7fd24723SPuranjay Mohan probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)" 29*7fd24723SPuranjay Mohan 30*7fd24723SPuranjay Mohanorig_sym="$(in_symbols orig.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)" 31*7fd24723SPuranjay Mohannew_sym="$( in_symbols patched.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)" 32*7fd24723SPuranjay Mohan 33*7fd24723SPuranjay Mohan[ -n "$orig_sym" ] && [ -n "$new_sym" ] || 34*7fd24723SPuranjay Mohan probe_skip "$THIN_CC did not promote the local symbol" 35*7fd24723SPuranjay Mohan 36*7fd24723SPuranjay Mohan# Equal hashes would make plain name matching work, testing nothing. 37*7fd24723SPuranjay Mohan[ "$orig_sym" != "$new_sym" ] || 38*7fd24723SPuranjay Mohan probe_skip "$THIN_CC gave the same ThinLTO hash for both builds" 39*7fd24723SPuranjay Mohan 40*7fd24723SPuranjay Mohanrun_diff 41*7fd24723SPuranjay Mohanassert_patched target 42*7fd24723SPuranjay Mohan 43*7fd24723SPuranjay Mohanout_symbols | grep -q "\.klp\.sym\.vmlinux\.$orig_sym," || 44*7fd24723SPuranjay Mohan fail "expected a klp relocation naming $orig_sym" 45*7fd24723SPuranjay Mohanout_symbols | grep -q "\.klp\.sym\.vmlinux\.$new_sym," && 46*7fd24723SPuranjay Mohan fail "klp relocation names $new_sym, which the running kernel does not have" 47*7fd24723SPuranjay Mohan 48*7fd24723SPuranjay Mohanpass "ThinLTO-mangled local correlated across differing hashes ($THIN_CC, $THIN_LD)" 49