| #!/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" |