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To: Andrea Corallo via Gcc-patches <gcc-patches@gcc.gnu.org>
Subject: [PATCH 9/12] arm: Make libgcc bti compatible
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Date: Thu, 28 Apr 2022 11:48:50 +0200
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From: Andrea Corallo via Gcc-patches <gcc-patches@gcc.gnu.org>
Reply-To: Andrea Corallo <andrea.corallo@arm.com>
Cc: Richard Earnshaw <Richard.Earnshaw@arm.com>, nd <nd@arm.com>
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| Series |
arm: Enables return address verification and branch target identification on Cortex-M
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Commit Message
Andrea Corallo
April 28, 2022, 9:48 a.m. UTC
This change add bti instructions at the beginning of arm specific libgcc hand written assembly routines. 2022-03-31 Andrea Corallo <andrea.corallo@arm.com> * libgcc/config/arm/crti.S (FUNC_START): Add bti instruction if necessary. * libgcc/config/arm/lib1funcs.S (THUMB_FUNC_START, FUNC_START): Likewise.
Comments
On 28/04/2022 10:48, Andrea Corallo via Gcc-patches wrote: > This change add bti instructions at the beginning of arm specific > libgcc hand written assembly routines. > > 2022-03-31 Andrea Corallo <andrea.corallo@arm.com> > > * libgcc/config/arm/crti.S (FUNC_START): Add bti instruction if > necessary. > * libgcc/config/arm/lib1funcs.S (THUMB_FUNC_START, FUNC_START): > Likewise. > +#if defined(__ARM_FEATURE_BTI) Wouldn't it be better to use __ARM_FEATURE_BTI_DEFAULT? That way we only get BTI instructions in multilib variants that have asked for BTI. R.
diff --git a/libgcc/config/arm/crti.S b/libgcc/config/arm/crti.S index 0192972a7e6..bac2d87fbb9 100644 --- a/libgcc/config/arm/crti.S +++ b/libgcc/config/arm/crti.S @@ -51,7 +51,9 @@ .macro FUNC_START #ifdef __thumb__ .thumb - +#if defined(__ARM_FEATURE_BTI) + bti +#endif push {r3, r4, r5, r6, r7, lr} #else .arm diff --git a/libgcc/config/arm/lib1funcs.S b/libgcc/config/arm/lib1funcs.S index 8c39c9f20a2..45dfb5da9ee 100644 --- a/libgcc/config/arm/lib1funcs.S +++ b/libgcc/config/arm/lib1funcs.S @@ -345,6 +345,9 @@ LSYM(Ldiv0): TYPE (\name) .thumb_func SYM (\name): +#if defined(__ARM_FEATURE_BTI) + bti +#endif .endm /* Function start macros. Variants for ARM and Thumb. */ @@ -372,6 +375,9 @@ SYM (\name): THUMB_FUNC THUMB_SYNTAX SYM (__\name): +#if defined(__ARM_FEATURE_BTI) + bti +#endif .endm .macro ARM_SYM_START name