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kernel_samsung_sm7125/scripts/Makefile.kcov

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BACKPORT: Makefile: support flag -fsanitizer-coverage=trace-cmp (Upstream commit d677a4d6019385488e794cc47bd3d6f9c2aab874.) The flag enables Clang instrumentation of comparison operations (currently not supported by GCC). This instrumentation is needed by the new KCOV device to collect comparison operands. Link: http://lkml.kernel.org/r/20171011095459.70721-2-glider@google.com Signed-off-by: Victor Chibotaru <tchibo@google.com> Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Popov <alex.popov@linux.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Kees Cook <keescook@chromium.org> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: <syzkaller@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Change-Id: Id294d9cc7619fb351a8929d11d45e532f86d2c36 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 147413187
7 years ago
ifdef CONFIG_KCOV
BACKPORT: kcov: test compiler capability in Kconfig and correct dependency Work around missing cc-option support in Kconfig by checking required compiler flags in Makefile. (Upstream commit 5aadfdeb8de001ca04d500586e3b033404c28617.) As Documentation/kbuild/kconfig-language.txt notes, 'select' should be be used with care - it forces a lower limit of another symbol, ignoring the dependency. Currently, KCOV can select GCC_PLUGINS even if arch does not select HAVE_GCC_PLUGINS. This could cause the unmet direct dependency. Now that Kconfig can test compiler capability, let's handle this in a more sophisticated way. There are two ways to enable KCOV; use the compiler that natively supports -fsanitize-coverage=trace-pc, or build the SANCOV plugin if the compiler has ability to build GCC plugins. Hence, the correct dependency for KCOV is: depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS You do not need to build the SANCOV plugin if the compiler already supports -fsanitize-coverage=trace-pc. Hence, the select should be: select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC With this, GCC_PLUGIN_SANCOV is selected only when necessary, so scripts/Makefile.gcc-plugins can be cleaner. I also cleaned up Kconfig and scripts/Makefile.kcov as well. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Kees Cook <keescook@chromium.org> Change-Id: Iad9110eb7b6ecef6dfcec38cf483699c1b85af01 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 147413187
7 years ago
ifeq ($(call cc-option, -fsanitize-coverage=trace-pc -Werror),)
ifneq ($(CONFIG_COMPILE_TEST),y)
$(error Cannot use CONFIG_KCOV: \
-fsanitize-coverage=trace-pc is not supported by compiler)
endif
endif
ifdef CONFIG_KCOV_ENABLE_COMPARISONS
ifeq ($(call cc-option, -fsanitize-coverage=trace-cmp -Werror),)
ifneq ($(CONFIG_COMPILE_TEST),y)
$(error Cannot use CONFIG_KCOV_ENABLE_COMPARISONS: \
-fsanitize-coverage=trace-cmp is not supported by compiler)
endif
endif
BACKPORT: Makefile: support flag -fsanitizer-coverage=trace-cmp (Upstream commit d677a4d6019385488e794cc47bd3d6f9c2aab874.) The flag enables Clang instrumentation of comparison operations (currently not supported by GCC). This instrumentation is needed by the new KCOV device to collect comparison operands. Link: http://lkml.kernel.org/r/20171011095459.70721-2-glider@google.com Signed-off-by: Victor Chibotaru <tchibo@google.com> Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Popov <alex.popov@linux.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Kees Cook <keescook@chromium.org> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: <syzkaller@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Change-Id: Id294d9cc7619fb351a8929d11d45e532f86d2c36 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 147413187
7 years ago
endif
BACKPORT: kcov: test compiler capability in Kconfig and correct dependency Work around missing cc-option support in Kconfig by checking required compiler flags in Makefile. (Upstream commit 5aadfdeb8de001ca04d500586e3b033404c28617.) As Documentation/kbuild/kconfig-language.txt notes, 'select' should be be used with care - it forces a lower limit of another symbol, ignoring the dependency. Currently, KCOV can select GCC_PLUGINS even if arch does not select HAVE_GCC_PLUGINS. This could cause the unmet direct dependency. Now that Kconfig can test compiler capability, let's handle this in a more sophisticated way. There are two ways to enable KCOV; use the compiler that natively supports -fsanitize-coverage=trace-pc, or build the SANCOV plugin if the compiler has ability to build GCC plugins. Hence, the correct dependency for KCOV is: depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS You do not need to build the SANCOV plugin if the compiler already supports -fsanitize-coverage=trace-pc. Hence, the select should be: select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC With this, GCC_PLUGIN_SANCOV is selected only when necessary, so scripts/Makefile.gcc-plugins can be cleaner. I also cleaned up Kconfig and scripts/Makefile.kcov as well. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Kees Cook <keescook@chromium.org> Change-Id: Iad9110eb7b6ecef6dfcec38cf483699c1b85af01 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 147413187
7 years ago
kcov-flags-$(CONFIG_CC_HAS_SANCOV_TRACE_PC) += -fsanitize-coverage=trace-pc
kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += -fsanitize-coverage=trace-cmp
kcov-flags-$(CONFIG_GCC_PLUGIN_SANCOV) += -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
export CFLAGS_KCOV := $(kcov-flags-y)
BACKPORT: Makefile: support flag -fsanitizer-coverage=trace-cmp (Upstream commit d677a4d6019385488e794cc47bd3d6f9c2aab874.) The flag enables Clang instrumentation of comparison operations (currently not supported by GCC). This instrumentation is needed by the new KCOV device to collect comparison operands. Link: http://lkml.kernel.org/r/20171011095459.70721-2-glider@google.com Signed-off-by: Victor Chibotaru <tchibo@google.com> Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Popov <alex.popov@linux.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Kees Cook <keescook@chromium.org> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: <syzkaller@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Change-Id: Id294d9cc7619fb351a8929d11d45e532f86d2c36 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Bug: 147413187
7 years ago
endif