From bd4317fbd60a0fa416761aaafb4e32ca1ad22d38 Mon Sep 17 00:00:00 2001 From: Naohiro Tamura Date: Wed, 12 May 2021 09:27:20 +0000 Subject: [PATCH] aarch64: define BTI_C and BTI_J macros as NOP unless HAVE_AARCH64_BTI This patch defines BTI_C and BTI_J macros conditionally for performance. If HAVE_AARCH64_BTI is true, BTI_C and BTI_J are defined as HINT instruction for ARMv8.5 BTI (Branch Target Identification). If HAVE_AARCH64_BTI is false, both BTI_C and BTI_J are defined as NOP. --- sysdeps/aarch64/sysdep.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h index 90acca4e42..b936e29cbd 100644 --- a/sysdeps/aarch64/sysdep.h +++ b/sysdeps/aarch64/sysdep.h @@ -62,8 +62,13 @@ strip_pac (void *p) #define ASM_SIZE_DIRECTIVE(name) .size name,.-name /* Branch Target Identitication support. */ -#define BTI_C hint 34 -#define BTI_J hint 36 +#if HAVE_AARCH64_BTI +# define BTI_C hint 34 +# define BTI_J hint 36 +#else +# define BTI_C nop +# define BTI_J nop +#endif /* Return address signing support (pac-ret). */ #define PACIASP hint 25 -- 2.43.5