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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# klp diff extracts entries from eight special sections. Between them the
# existing tests reach .kcfi_traps, __jump_table, .static_call_sites and
# .altinstructions; __bug_table, __ex_table and __mcount_loc are covered by
# nothing, though the same extraction code serves all of them.
#
# Losing an entry is quiet in every case and wrong in a different way for each:
# a WARN() in patched code that no longer reports where it came from, an
# exception fixup that is simply not there when the faulting instruction traps,
# a function ftrace can no longer see.
. "$(dirname "$0")/../lib.sh"
# section, entry size, relocations per entry
for spec in "__bug_table 12 1" "__ex_table 12 2" "__mcount_loc 8 1"; do
set -- $spec
sec=$1
# A fresh workdir per section: run_diff caches its checksums.
setup
build_pair special_sections.c \
-DSPECIAL_SEC="\"$1\"" -DSPECIAL_ENTSIZE="$2" -DSPECIAL_RELOCS="$3"
assert_input_section "$sec"
run_diff
# Extracted, and pointing at the function that was patched.
assert_section "$sec"
assert_reloc_sym "$sec" target
assert_patched target
# Nothing belonging to the function that was not.
assert_not_patched other
assert_no_reloc_sym "$sec" other
cleanup
done
pass "__bug_table, __ex_table and __mcount_loc entries extracted"
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