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Thu, 21 Jul 2022 09:17:51 +0000 To: Richard Earnshaw Subject: [PATCH 9/12 V2] arm: Make libgcc bti compatible References: <6c251f00-6b73-110c-d2b3-5e115ed6912b@foss.arm.com> Date: Thu, 21 Jul 2022 11:17:51 +0200 In-Reply-To: <6c251f00-6b73-110c-d2b3-5e115ed6912b@foss.arm.com> (Richard Earnshaw's message of "Fri, 1 Jul 2022 16:03:49 +0100") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1.50 (gnu/linux) MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-Office365-Filtering-Correlation-Id: 05692e83-46f2-48d6-4823-08da6af9e9da X-MS-TrafficTypeDiagnostic: AM5PR0802MB2515:EE_|AM5EUR03FT050:EE_|VI1PR08MB3840:EE_ x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234; 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That way we > only get BTI instructions in multilib variants that have asked for > BTI. > > R. Hi Richard, good point, yes I think so. Please find attached the updated patch. BR Andrea From 6975c9ddbc8a4b790a765589c6fd07fea92173e5 Mon Sep 17 00:00:00 2001 From: Andrea Corallo Date: Tue, 8 Feb 2022 10:58:31 +0100 Subject: [PATCH] [PATCH 9/12] arm: Make libgcc bti compatible This change add bti instructions at the beginning of arm specific libgcc hand written assembly routines. 2022-03-31 Andrea Corallo * libgcc/config/arm/crti.S (FUNC_START): Add bti instruction if necessary. * libgcc/config/arm/lib1funcs.S (THUMB_FUNC_START, FUNC_START): Likewise. --- libgcc/config/arm/crti.S | 4 +++- libgcc/config/arm/lib1funcs.S | 6 ++++++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/libgcc/config/arm/crti.S b/libgcc/config/arm/crti.S index 0192972a7e6..4098353af1c 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_DEFAULT) + 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..de98edcc300 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_DEFAULT) + 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_DEFAULT) + bti +#endif .endm .macro ARM_SYM_START name