On Sat, Jan 09, 2021 at 04:46:21PM +0100, Sedat Dilek wrote:

On Sat, Jan 9, 2021 at 4:36 PM Josh Poimboeuf [off-list ref] wrote:

quoted

On Sat, Jan 09, 2021 at 03:54:20PM +0100, Sedat Dilek wrote:

quoted

I am interested in having Clang LTO (Clang-CFI) for x86-64 working and
help with testing.

I tried the Git tree mentioned in [3] <jpoimboe.git#objtool-vmlinux>
(together with changes from <peterz.git#x86/urgent>).

I only see in my build-log...

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool:
eb_relocate_parse_slow()+0x3d0: stack state mismatch: cfa1=7+120
cfa2=-1+0
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool:
eb_copy_relocations()+0x229: stack state mismatch: cfa1=7+120
cfa2=-1+0

...which was reported and worked on in [1].

This is with Clang-IAS version 11.0.1.

Unfortunately, the recent changes in <samitolvanen.github#clang-cfi>
do not cleanly apply with Josh stuff.
My intention/wish was to report this combination of patchsets "heals"
a lot of objtool-warnings for vmlinux.o I observed with Clang-CFI.

Is it possible to have a Git branch where Josh's objtool-vmlinux is
working together with Clang-LTO?
For testing purposes.

I updated my branch with my most recent work from before the holidays,
can you try it now?  It still doesn't fix any of the crypto warnings,
but I'll do that in a separate set after posting these next week.

Thanks, Josh.

Did you push it (oh ah push it push it really really really good...)
to your remote Git please :-).

I thought I already pushed it pretty good ;-) do you not see it?

git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git objtool-vmlinux

d6baee244f2d — objtool: Alphabetize usage option list (3 weeks ago)
c0b2a6a625ac — objtool: Separate vmlinux/noinstr validation config options (3 weeks ago)
84c53551ad17 — objtool: Enable full vmlinux validation (3 weeks ago)
e518ac0801cd — x86/power: Support objtool validation in hibernate_asm_64.S (3 weeks ago)
d0ac4c7301c1 — x86/power: Move restore_registers() to top of the file (3 weeks ago)
d3389bc83538 — x86/power: Convert indirect jumps to retpolines (3 weeks ago)
7a974d90aa40 — x86/acpi: Support objtool validation in wakeup_64.S (3 weeks ago)
6693e26cd6cc — x86/acpi: Convert indirect jump to retpoline (3 weeks ago)
0dfb760c74d1 — x86/ftrace: Support objtool vmlinux.o validation in ftrace_64.S (3 weeks ago)
89a4febfd7bf — x86/xen/pvh: Convert indirect jump to retpoline (3 weeks ago)
b62837092140 — x86/xen: Support objtool vmlinux.o validation in xen-head.S (3 weeks ago)
705e18481ed9 — x86/xen: Support objtool validation in xen-asm.S (3 weeks ago)
3548319e21b9 — objtool: Add xen_start_kernel() to noreturn list (3 weeks ago)
6016e8da8c3d — objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC (3 weeks ago)
56d6a7aee8b1 — objtool: Add asm version of STACK_FRAME_NON_STANDARD (3 weeks ago)
68259d951f1a — objtool: Assume only ELF functions do sibling calls (3 weeks ago)
0d6c8816cf91 — x86/ftrace: Add UNWIND_HINT_FUNC annotation for ftrace_stub (3 weeks ago)
24d6ce8cd8f6 — objtool: Support retpoline jump detection for vmlinux.o (3 weeks ago)
8145ea268f16 — objtool: Fix ".cold" section suffix check for newer versions of GCC (3 weeks ago)
b3dfca472514 — objtool: Fix retpoline detection in asm code (3 weeks ago)
b82402fa5211 — objtool: Fix error handling for STD/CLD warnings (3 weeks ago)
1f02defb4b79 — objtool: Fix seg fault in BT_FUNC() with fake jump (3 weeks ago)
2c85ebc57b3e — Linux 5.10 (4 weeks ago)

-- 
Josh


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