Ilie Halip 14db1f0a93 objtool: Ignore unreachable trap after call to noreturn functions ... With CONFIG_UBSAN_TRAP enabled, the compiler may insert a trap instruction after a call to a noreturn function. In this case, objtool warns that the UD2 instruction is unreachable. This is a behavior seen with Clang, from the oldest version capable of building the mainline x64_64 kernel (9.0), to the latest experimental version (12.0). Objtool silences similar warnings (trap after dead end instructions), so so expand that check to include dead end functions. Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Rong Chen <rong.a.chen@intel.com> Cc: Marco Elver <elver@google.com> Cc: Philip Li <philip.li@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: kasan-dev@googlegroups.com Cc: x86@kernel.org Cc: clang-built-linux@googlegroups.com BugLink: https://github.com/ClangBuiltLinux/linux/issues/1148 Link: https://lore.kernel.org/lkml/CAKwvOdmptEpi8fiOyWUo=AiZJiX+Z+VHJOM2buLPrWsMTwLnyw@mail.gmail.com Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Ilie Halip <ilie.halip@gmail.com> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>		2020-09-21 10:20:10 -05:00
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arch/x86	objtool: Decode unwind hint register depending on architecture	2020-09-10 10:43:13 -05:00
Documentation	objtool: Add support for intra-function calls	2020-04-30 20:14:33 +02:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
arch.h	objtool: Decode unwind hint register depending on architecture	2020-09-10 10:43:13 -05:00
Build	objtool: Enable compilation of objtool for all architectures	2020-05-20 09:17:28 -05:00
builtin-check.c	objtool: Move ORC logic out of check()	2020-09-01 17:19:11 -05:00
builtin-orc.c	objtool: Move ORC logic out of check()	2020-09-01 17:19:11 -05:00
builtin.h	objtool: Implement noinstr validation	2020-04-22 10:53:50 +02:00
cfi.h	objtool: Fix !CFI insn_state propagation	2020-04-22 10:53:50 +02:00
check.c	objtool: Ignore unreachable trap after call to noreturn functions	2020-09-21 10:20:10 -05:00
check.h	objtool: Refactor jump table code to support other architectures	2020-09-10 10:43:13 -05:00
elf.c	x86/static_call: Add inline static call implementation for x86-64	2020-09-01 09:58:05 +02:00
elf.h	x86/static_call: Add inline static call implementation for x86-64	2020-09-01 09:58:05 +02:00
Makefile	objtool: Define 'struct orc_entry' only when needed	2020-09-01 17:19:12 -05:00
objtool.c	objtool: Move object file loading out of check()	2020-09-01 17:19:07 -05:00
objtool.h	objtool: Abstract alternative special case handling	2020-09-10 10:43:13 -05:00
orc_dump.c	objtool: Make unwind hint definitions available to other architectures	2020-09-10 10:43:13 -05:00
orc_gen.c	objtool: Make unwind hint definitions available to other architectures	2020-09-10 10:43:13 -05:00
special.c	objtool: Abstract alternative special case handling	2020-09-10 10:43:13 -05:00
special.h	objtool: Refactor jump table code to support other architectures	2020-09-10 10:43:13 -05:00
sync-check.sh	objtool: Make unwind hint definitions available to other architectures	2020-09-10 10:43:13 -05:00
warn.h	objtool: Rename find_containing_func()	2020-03-25 18:28:29 +01:00
weak.c	objtool: Abstract alternative special case handling	2020-09-10 10:43:13 -05:00