Josh Poimboeuf b68b990706 objtool: Support conditional retpolines ...

A Clang-built kernel is showing the following warning:

  arch/x86/kernel/platform-quirks.o: warning: objtool: x86_early_init_platform_quirks()+0x84: unreachable instruction

That corresponds to this code:

  7e:   0f 85 00 00 00 00       jne    84 <x86_early_init_platform_quirks+0x84>
                        80: R_X86_64_PC32       __x86_indirect_thunk_r11-0x4
  84:   c3                      retq

This is a conditional retpoline sibling call, which is now possible
thanks to retpolines.  Objtool hasn't seen that before.  It's
incorrectly interpreting the conditional jump as an unconditional
dynamic jump.

Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/30d4c758b267ef487fb97e6ecb2f148ad007b554.1563413318.git.jpoimboe@redhat.com

2019-07-18 21:01:10 +02:00

..

arch/x86

objtool: Convert insn type to enum

2019-07-18 21:01:10 +02:00

Documentation

docs: fix broken documentation links

2019-06-08 13:42:13 -06:00

.gitignore

objtool: Move synced files to their original relative locations

2017-11-07 10:48:23 +01:00

arch.h

objtool: Support conditional retpolines

2019-07-18 21:01:10 +02:00

Build

objtool: Fix build by linking against tools/lib/ctype.o sources

2019-07-02 10:49:31 -03:00

builtin-check.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

builtin-orc.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

builtin.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

cfi.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

check.c

objtool: Support conditional retpolines

2019-07-18 21:01:10 +02:00

check.h

objtool: Convert insn type to enum

2019-07-18 21:01:10 +02:00

elf.c

objtool: Refactor jump table code

2019-07-18 21:01:09 +02:00

elf.h

objtool: Support repeated uses of the same C jump table

2019-07-18 21:01:09 +02:00

Makefile

objtool: Allow AR to be overridden with HOSTAR

2019-05-17 11:10:42 +02:00

objtool.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc_dump.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc_gen.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

special.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

special.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

sync-check.sh

objtool: Move kernel headers/code sync check to a script

2017-11-07 10:48:34 +01:00

warn.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00