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Peter Anvin" Cc: Richard Biener , Segher Boessenkool , Peter Zijlstra , Juergen Gross , Josh Poimboeuf , Kees Cook , Linus Torvalds , Masahiro Yamada , Andrey Ryabinin , Andrew Morton , linux-kernel@vger.kernel.org Subject: [PATCH v3 10/12] linux/linkage: add ASM() macro to reduce duplication between C/ASM code Date: Tue, 18 Dec 2018 01:03:25 +0900 Message-Id: <1545062607-8599-11-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1545062607-8599-1-git-send-email-yamada.masahiro@socionext.com> References: <1545062607-8599-1-git-send-email-yamada.masahiro@socionext.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We often duplicate similar assembly code to use it from .c and .S files. The difference is mostly the presence of double quotes. So, here is a new macro ASM(). (We have similar approach for __ASM_FORM(), etc.) The usage is like this: #define MY_CODE \ ASM( .section ".text" )\ ASM( movl $1, %eax ) In C context, the preprocessor expands it into: ".section \".text\"" "\n\t" "movl $1, %eax" "\n\t" This is perfect for the use from the inline asm(...) in .c files. In assembly context, the preprocessor expands it into: .section ".text" ; movl $1, %eax ; This is fine for the use in .S files. I used double-expansion like __stringify() so that we can use macros in ASM(...). Signed-off-by: Masahiro Yamada --- include/linux/linkage.h | 8 ++++++++ 1 file changed, 8 insertions(+) -- 2.7.4 diff --git a/include/linux/linkage.h b/include/linux/linkage.h index 7c47b1a..80faeae 100644 --- a/include/linux/linkage.h +++ b/include/linux/linkage.h @@ -12,6 +12,14 @@ #define ASM_NL ; #endif +#ifdef __ASSEMBLY__ +#define _ASM(x...) x ASM_NL +#else +#define _ASM(x...) #x __stringify(\n\t) +#endif +/* Doing two levels allows macros to be used in ASM(...) */ +#define ASM(x...) _ASM(x) + #ifdef __cplusplus #define CPP_ASMLINKAGE extern "C" #else