Josh Poimboeuf 3c1f05835c objtool: Add Clang support ... Since the ORC unwinder was made the default on x86_64, Clang-built defconfig kernels have triggered some new objtool warnings: drivers/gpu/drm/i915/i915_gpu_error.o: warning: objtool: i915_error_printf()+0x6c: return with modified stack frame drivers/gpu/drm/i915/intel_display.o: warning: objtool: pipe_config_err()+0xa6: return with modified stack frame The problem is that objtool has never seen clang-built binaries before. Shockingly enough, objtool is apparently able to follow the code flow mostly fine, except for one instruction sequence. Instead of a LEAVE instruction, clang restores RSP and RBP the long way: 67c: 48 89 ec mov %rbp,%rsp 67f: 5d pop %rbp Teach objtool about this new code sequence. Reported-and-test-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matthias Kaehlcke <mka@chromium.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/fce88ce81c356eedcae7f00ed349cfaddb3363cc.1521741586.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-03-27 08:21:29 +02:00
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arch/x86
Documentation
.gitignore
arch.h
Build
builtin-check.c	objtool: Add module specific retpoline rules	2018-02-21 09:05:05 +01:00
builtin-orc.c	objtool: Use existing global variables for options	2018-02-21 09:05:04 +01:00
builtin.h	objtool: Add module specific retpoline rules	2018-02-21 09:05:05 +01:00
cfi.h
check.c	objtool: Add Clang support	2018-03-27 08:21:29 +02:00
check.h	objtool: Add retpoline validation	2018-02-21 09:05:04 +01:00
elf.c
elf.h
Makefile
objtool.c
orc.h
orc_dump.c
orc_gen.c
special.c
special.h
sync-check.sh
warn.h