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Subject: Re: [PATCH 7/12] arm: Emit build attributes for PACBTI target feature
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To: Andrea Corallo <andrea.corallo@arm.com>,
 Andrea Corallo via Gcc-patches <gcc-patches@gcc.gnu.org>
Cc: Richard Earnshaw <Richard.Earnshaw@arm.com>, nd <nd@arm.com>
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On 28/04/2022 10:45, Andrea Corallo via Gcc-patches wrote:
> This patch emits assembler directives for PACBTI build attributes as
> defined by the
> ABI.
> 
> <https://github.com/ARM-software/abi-aa/releases/download/2021Q1/addenda32.pdf>
> 
> gcc/ChangeLog:
> 
> 	* config/arm/arm.c (arm_file_start): Emit EABI attributes for
> 	Tag_PAC_extension, Tag_BTI_extension, TAG_BTI_use, TAG_PACRET_use.

This bit is OK.

> 
> gcc/testsuite/ChangeLog:
> 
> 	* gcc.target/arm/acle/pacbti-m-predef-1.c: New test.
> 	* gcc.target/arm/acle/pacbti-m-predef-3: Likewise.
> 	* gcc.target/arm/acle/pacbti-m-predef-6.c: Likewise.
> 	* gcc.target/arm/acle/pacbti-m-predef-7.c: Likewise.

These tests contain directives like:

+/* { dg-additional-options " -mbranch-protection=pac-ret+bti 
--save-temps" } */

But they don't check that the architecture permits this (it has to be 
armv8-m.main or later).

> 
> Co-Authored-By: Tejas Belagod  <tbelagod@arm.com>
> 

R.