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From: "peterz at infradead dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102952] New code-gen options for retpolines and straight
 line speculation
Date: Wed, 27 Oct 2021 22:07:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102952

--- Comment #13 from peterz at infradead dot org ---
(In reply to H.J. Lu from comment #12)
> (In reply to peterz from comment #9)
> > Created attachment 51683 [details]
> > kernel patch to test -mharden-sls=3Dall
> >=20
> > $ make O=3Ddefconfig CC=3Dgcc-12.0.0 arch/x86/entry/common.o
> > ...
> > arch/x86/entry/common.o: warning: objtool: do_SYSENTER_32()+0x1b:
> > unreachable instruction
>=20
> Please try the v2 patch.

Per comment #6 this should be v3, no? Anyway, the good news is that I now s=
eem
to have a kernel image with lots of extra int3 instructions, but all in the
right place.

*However*, I seem to be missing a few:

  36f4:       41 5f                   pop    %r15
  36f6:       e9 00 00 00 00          jmp    36fb <__do_set_cpus_allowed+0x=
5b>
        36f7: R_X86_64_PLT32    __x86_indirect_thunk_rax-0x4
  36fb:       48 8b 87 90 02 00 00    mov    0x290(%rdi),%rax

There should be one after the jmp __x86_indirect_thunk_* thingy. I'll do an
objtool patch to search for missing int3, but that'll have to wait until
tomorrow, it's past midnight.=