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objtool: Ignore unreachable fake jumps

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It is possible for alternative code to unconditionally jump out of the
alternative region. In such a case, if a fake jump is added at the end
of the alternative instructions, the fake jump will never be reached.
Since the fake jump is just a mean to make sure code validation does not
go beyond the set of alternatives, reaching it is not a requirement.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Julien Thierry 2020-09-15 08:53:17 +01:00 committed by Josh Poimboeuf
parent f4f803984c
commit fb136219f0
1 changed files with 3 additions and 0 deletions
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3
tools/objtool/check.c
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@ -2648,6 +2648,9 @@ static bool ignore_unreachable_insn(struct instruction *insn)
!strcmp(insn->sec->name, ".altinstr_aux"))
return true;
if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->offset == FAKE_JUMP_OFFSET)
return true;
if (!insn->func)
return false;