diff mbox series

[1/7,Arm] Add Armv8.1-M Mainline target feature +pacbti.

Message ID AM5PR0801MB1844171E5660553776A576AEEAB29@AM5PR0801MB1844.eurprd08.prod.outlook.com
State Superseded
Headers
Series [1/7,Arm] Add Armv8.1-M Mainline target feature +pacbti. |

Commit Message

Tejas Belagod Oct. 8, 2021, 12:17 p.m. UTC 
  Hi,

This patch adds the -march feature +pacbti to Armv8.1-M Mainline.
This feature enables pointer signing and authentication instructions
on M-class architectures.

Tested on arm-none-eabi. OK for trunk?

2021-10-04  Tejas Belagod  <tbelagod@arm.com>

gcc/Changelog:

	* config/arm/arm-cpus.in: Define new feature pacbti.
	* config/arm/arm.h (TARGET_HAVE_PACBTI): New.

Comments

Richard Earnshaw (lists) Oct. 11, 2021, 12:28 p.m. UTC | #1 
On 08/10/2021 13:17, Tejas Belagod via Gcc-patches wrote:
> Hi,
> 
> This patch adds the -march feature +pacbti to Armv8.1-M Mainline.
> This feature enables pointer signing and authentication instructions
> on M-class architectures.
> 
> Tested on arm-none-eabi. OK for trunk?
> 
> 2021-10-04  Tejas Belagod  <tbelagod@arm.com>
> 
> gcc/Changelog:
> 
> 	* config/arm/arm-cpus.in: Define new feature pacbti.
> 	* config/arm/arm.h (TARGET_HAVE_PACBTI): New.
> 

"+pacbti" needs to be documented in invoke.texi at the appropriate place.

R.
diff mbox series

Patch

diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
index d0d0d0f1c7e4176fc4aa30d82394fe938b083a59..8a0e9c79682766ee2bec3fd7ba6ed67dff69dbad 100644
--- a/gcc/config/arm/arm-cpus.in
+++ b/gcc/config/arm/arm-cpus.in
@@ -223,6 +223,10 @@  define feature cdecp5
 define feature cdecp6
 define feature cdecp7
 
+# M-profile control flow integrity extensions (PAC/AUT/BTI).
+# Optional from Armv8.1-M Mainline.
+define feature pacbti
+
 # Feature groups.  Conventionally all (or mostly) upper case.
 # ALL_FPU lists all the feature bits associated with the floating-point
 # unit; these will all be removed if the floating-point unit is disabled
@@ -741,6 +745,7 @@  begin arch armv8.1-m.main
  option nofp remove ALL_FP
  option mve add MVE
  option mve.fp add MVE_FP
+ option pacbti add pacbti
  option cdecp0 add cdecp0
  option cdecp1 add cdecp1
  option cdecp2 add cdecp2
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 015299c15346f1bea59d70fdcb1d19545473b23b..8e6ef41f6b065217d1af3f4f1cb85b2d8fbd0dc0 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -335,6 +335,12 @@  emission of floating point pcs attributes.  */
 						isa_bit_mve_float) \
 			       && !TARGET_GENERAL_REGS_ONLY)
 
+/* Non-zero if this target supports Armv8.1-M Mainline pointer-signing
+   extension.  */
+#define TARGET_HAVE_PACBTI (arm_arch8_1m_main \
+			    && bitmap_bit_p (arm_active_target.isa, \
+					     isa_bit_pacbti))
+
 /* MVE have few common instructions as VFP, like VLDM alias VPOP, VLDR, VSTM
    alia VPUSH, VSTR and VMOV, VMSR and VMRS.  In the same manner it updates few
    registers such as FPCAR, FPCCR, FPDSCR, FPSCR, MVFR0, MVFR1 and MVFR2.  All