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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 e81e072443 ("objtool: Support Clang non-section symbols
in ORC generation").

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen 2020-10-28 10:16:26 -07:00 committed by Kees Cook
parent 99d0021569
commit 18a14575ae
1 changed files with 15 additions and 2 deletions
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17
tools/objtool/check.c
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@ -573,8 +573,21 @@ static int create_mcount_loc_sections(struct objtool_file *file)
}
memset(reloc, 0, sizeof(*reloc));
reloc->sym = insn->sec->sym;
reloc->addend = insn->offset;
if (insn->sec->sym) {
reloc->sym = insn->sec->sym;
reloc->addend = insn->offset;
} else {
reloc->sym = find_symbol_containing(insn->sec, insn->offset);
if (!reloc->sym) {
WARN("missing symbol for insn at offset 0x%lx\n",
insn->offset);
return -1;
}
reloc->addend = insn->offset - reloc->sym->offset;
}
reloc->type = R_X86_64_64;
reloc->offset = idx * sizeof(unsigned long);
reloc->sec = reloc_sec;