Ping!!
________________________________
From: Gcc-patches
<gcc-patches-bounces+srinath.parvathaneni=arm....@gcc.gnu.org> on behalf of
Srinath Parvathaneni via Gcc-patches <gcc-patches@gcc.gnu.org>
Sent: 31 October 2022 15:36
To: gcc-patches@gcc.gnu.org <gcc-patches@gcc.gnu.org>
Cc: Richard Earnshaw <richard.earns...@arm.com>
Subject: [GCC][PATCH v2] arm: Add pacbti related multilib support for
armv8.1-m.main.
Hi,
This patch adds the support for pacbti multlilib linking by making
"-mbranch-protection=none" as default in the command line for all M-profile
targets and uses "-mbranch-protection=none" for multilib matching. If any
valid value is passed to "-mbranch-protection" in the command line, this
new value overwrites the default value in the command line and uses
"-mbranch-protection=standard" for multilib matching.
Eg 1.
If the passed command line flags are:
a) -march=armv8.1-m.main+mve -mfloat-abi=hard -mfpu=auto
b) -mcpu=cortex-m85+nopacbti -mfloat-abi=hard -mfpu=auto
After this patch the command line flags the compiler receives will be:
a) -march=armv8.1-m.main+mve -mfloat-abi=hard -mfpu=auto
-mbranch-protection=none
b) -mcpu=cortex-m85+nopacbti -mfloat-abi=hard -mfpu=auto
-mbranch-protection=none
"-mbranch-protection=none" will be used in the multilib matching.
Eg 2.
If the passed command line flags are:
a) -march=armv8.1-m.main+mve+pacbti -mfloat-abi=hard -mfpu=auto
-mbranch-protection=pac-ret
b) -mcpu=cortex-m85 -mfloat-abi=hard -mfpu=auto -mbranch-protection=pac-ret+bti
After this patch the command line flags the compiler receives will be:
a) -march=armv8.1-m.main+mve+pacbti -mfloat-abi=hard -mfpu=auto
-mbranch-protection=pac-ret
b) -mcpu=cortex-m85 -mfloat-abi=hard -mfpu=auto -mbranch-protection=pac-ret+bti
"-mbranch-protection=standard" will be used in the multilib matching.
Eg 3.
For A-profile target, if the passed command line flags are:
-march=armv8-a+simd -mfloat-abi=hard -mfpu=auto
Even after this patch the command line flags compiler receives will remain the
same:
-march=armv8-a+simd -mfloat-abi=hard -mfpu=auto
Regression tested on arm-none-eabi and bootstrapped on arm-none-linux-gnueabihf.
Ok for master?
Regards,
Srinath.
gcc/ChangeLog:
2022-10-28 Srinath Parvathaneni <srinath.parvathan...@arm.com>
* common/config/arm/arm-common.cc
(arm_canon_branch_protection_option): Define new function.
* config/arm/arm-cpus.in (armv8.1-m.main): Move dsp option below pacbti
option.
* config/arm/arm.h (arm_canon_branch_protection_option): Define function
prototype.
(CANON_BRANCH_PROTECTION_SPEC_FUNCTION): Define macro.
(MBRANCH_PROTECTION_SPECS): Likewise.
* config/arm/t-rmprofile (MULTI_ARCH_OPTS_RM): Add new options.
(MULTI_ARCH_DIRS_RM): Add new directories.
(MULTILIB_REQUIRED): Add new option.
(MULTILIB_REUSE): Reuse existing multlibs.
(MULTILIB_MATCHES): Match multilib strings.
gcc/testsuite/ChangeLog:
2022-10-28 Srinath Parvathaneni <srinath.parvathan...@arm.com>
* gcc.target/arm/multilib.exp (multilib_config "rmprofile"): Update
tests.
* gcc.target/arm/pac-10.c: New test.
* gcc.target/arm/pac-11.c: Likewise.
* gcc.target/arm/pac-12.c: Likewise.
