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| author | Julien Thierry <jthierry@redhat.com> | 2020-09-15 08:53:17 +0100 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@redhat.com> | 2020-09-18 12:04:00 -0500 |
| commit | fb136219f0e2b417d84e67b2a3adc1f933997d04 (patch) | |
| tree | dd116fdecbb246823a8e808069882416b0b0a242 /tools/objtool | |
| parent | f4f803984c3685f416a74e9e2fa7d39bdafbe02b (diff) | |
| download | linux-fb136219f0e2b417d84e67b2a3adc1f933997d04.tar.gz linux-fb136219f0e2b417d84e67b2a3adc1f933997d04.tar.bz2 linux-fb136219f0e2b417d84e67b2a3adc1f933997d04.zip | |
objtool: Ignore unreachable fake jumps
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>
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/check.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index fd2edab8e672..cd7c6698d316 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -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; |