objtool: Fix __mcount_loc generation with Clang's assembler
authorSami Tolvanen <samitolvanen@google.com>
Wed, 28 Oct 2020 17:16:26 +0000 (10:16 -0700)
committerKees Cook <keescook@chromium.org>
Tue, 23 Feb 2021 20:46:56 +0000 (12:46 -0800)
commit18a14575ae31c5a97a5e87e961932a5016d369be
treed7ea195c1f2189a7655ccb1755175eb05ea2dd71
parent99d0021569c71c325f41a7dd0a08a380010ce95c
objtool: Fix __mcount_loc generation with Clang's assembler

When objtool generates relocations for the __mcount_loc section, it
tries to reference __fentry__ calls by their section symbol offset.
However, this fails with Clang's integrated assembler as it may not
generate section symbols for every section. This patch looks up a
function symbol instead if the section symbol is missing, similarly
to commit e81e07244325 ("objtool: Support Clang non-section symbols
in ORC generation").

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
tools/objtool/check.c