From: Amit Daniel Kachhap <amit.kachhap@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, Kees Cook <keescook@chromium.org>, Ard Biesheuvel <ardb@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Will Deacon <will@kernel.org>, Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>, Kristina Martsenko <kristina.martsenko@arm.com>, Dave Martin <Dave.Martin@arm.com>, Amit Daniel Kachhap <amit.kachhap@arm.com>, James Morse <james.morse@arm.com>, Vincenzo Frascino <Vincenzo.Frascino@arm.com>, Mark Brown <broonie@kernel.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, linux-kbuild@vger.kernel.org Subject: [PATCH v7 15/17] kconfig: Add support for 'as-option' Date: Fri, 13 Mar 2020 14:35:02 +0530 [thread overview] Message-ID: <1584090304-18043-16-git-send-email-amit.kachhap@arm.com> (raw) In-Reply-To: <1584090304-18043-1-git-send-email-amit.kachhap@arm.com> From: Vincenzo Frascino <vincenzo.frascino@arm.com> Currently kconfig does not have a feature that allows to detect if the used assembler supports a specific compilation option. Introduce 'as-option' to serve this purpose in the context of Kconfig: config X def_bool $(as-option,...) Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: linux-kbuild@vger.kernel.org Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> --- scripts/Kconfig.include | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index 85334dc..a1c1925 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -31,6 +31,12 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /de # Return y if the linker supports <flag>, n otherwise ld-option = $(success,$(LD) -v $(1)) +# $(as-option,<flag>) +# /dev/zero is used as output instead of /dev/null as some assembler cribs when +# both input and output are same. Also both of them have same write behaviour so +# can be easily substituted. +as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero) + # $(as-instr,<instr>) # Return y if the assembler supports <instr>, n otherwise as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -) -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Amit Daniel Kachhap <amit.kachhap@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, Kees Cook <keescook@chromium.org>, Suzuki K Poulose <suzuki.poulose@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, linux-kbuild@vger.kernel.org, Kristina Martsenko <kristina.martsenko@arm.com>, Dave Martin <Dave.Martin@arm.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, Mark Brown <broonie@kernel.org>, James Morse <james.morse@arm.com>, Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>, Amit Daniel Kachhap <amit.kachhap@arm.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org> Subject: [PATCH v7 15/17] kconfig: Add support for 'as-option' Date: Fri, 13 Mar 2020 14:35:02 +0530 [thread overview] Message-ID: <1584090304-18043-16-git-send-email-amit.kachhap@arm.com> (raw) In-Reply-To: <1584090304-18043-1-git-send-email-amit.kachhap@arm.com> From: Vincenzo Frascino <vincenzo.frascino@arm.com> Currently kconfig does not have a feature that allows to detect if the used assembler supports a specific compilation option. Introduce 'as-option' to serve this purpose in the context of Kconfig: config X def_bool $(as-option,...) Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: linux-kbuild@vger.kernel.org Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> --- scripts/Kconfig.include | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index 85334dc..a1c1925 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -31,6 +31,12 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /de # Return y if the linker supports <flag>, n otherwise ld-option = $(success,$(LD) -v $(1)) +# $(as-option,<flag>) +# /dev/zero is used as output instead of /dev/null as some assembler cribs when +# both input and output are same. Also both of them have same write behaviour so +# can be easily substituted. +as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero) + # $(as-instr,<instr>) # Return y if the assembler supports <instr>, n otherwise as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-03-13 9:06 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-13 9:04 [PATCH v7 00/17] arm64: return address signing Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 01/17] arm64: cpufeature: Fix meta-capability cpufeature check Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 02/17] arm64: cpufeature: add pointer auth meta-capabilities Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 03/17] arm64: rename ptrauth key structures to be user-specific Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 04/17] arm64: install user ptrauth keys at kernel exit time Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 05/17] arm64: ptrauth: Add bootup/runtime flags for __cpu_setup Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 06/17] arm64: cpufeature: Move cpu capability helpers inside C file Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 07/17] arm64: cpufeature: handle conflicts based on capability Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 08/17] arm64: enable ptrauth earlier Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 09/17] arm64: initialize and switch ptrauth kernel keys Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 10/17] arm64: initialize ptrauth keys for kernel booting task Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 11/17] arm64: mask PAC bits of __builtin_return_address Amit Daniel Kachhap 2020-03-13 9:04 ` [PATCH v7 12/17] arm64: unwind: strip PAC from kernel addresses Amit Daniel Kachhap 2020-03-13 9:05 ` [PATCH v7 13/17] arm64: __show_regs: strip PAC from lr in printk Amit Daniel Kachhap 2020-03-13 9:05 ` [PATCH v7 14/17] arm64: suspend: restore the kernel ptrauth keys Amit Daniel Kachhap 2020-03-13 9:05 ` Amit Daniel Kachhap [this message] 2020-03-13 9:05 ` [PATCH v7 15/17] kconfig: Add support for 'as-option' Amit Daniel Kachhap 2020-03-13 9:10 ` Masahiro Yamada 2020-03-13 9:10 ` Masahiro Yamada 2020-03-13 9:14 ` Amit Kachhap 2020-03-13 9:14 ` Amit Kachhap 2020-03-13 9:05 ` [PATCH v7 16/17] arm64: compile the kernel with ptrauth return address signing Amit Daniel Kachhap 2020-03-19 18:19 ` [PATCH] arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH Nick Desaulniers 2020-03-19 18:35 ` Nathan Chancellor 2020-03-20 15:09 ` Catalin Marinas 2020-03-13 9:05 ` [PATCH v7 17/17] lkdtm: arm64: test kernel pointer authentication Amit Daniel Kachhap 2020-03-18 14:32 ` [PATCH v7 00/17] arm64: return address signing Catalin Marinas
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