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aarch64: Add +pauth to -march

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New +pauth (Pointer Authentication from Armv8.3-A) feature option for
-march command line option.

Please note that majority of PAUTH instructions are implemented behind HINT
instruction. PAUTH stays an Armv8.3-A feature but now can be assigned to other
architectures or CPUs.

gcc/ChangeLog:

	* config/aarch64/aarch64-option-extensions.def
	(AARCH64_OPT_EXTENSION): New +pauth option in -march for AArch64.
	* config/aarch64/aarch64.h (AARCH64_FL_PAUTH): New pauth extension bitmask.
	(AARCH64_ISA_PUATH): New ISA bitmask for PAUTH.
	(AARCH64_FL_FOR_ARCH8_3): Add PAUTH to Armv8.3-A.
	(TARGET_PAUTH): New target mask to isolate PAUTH instructions.
	* config/aarch64/aarch64.md (do_return): Condition set to TARGET_PAUTH.
	* doc/invoke.texi: Update docs for +flagm and +pauth.
This commit is contained in:
Przemyslaw Wirkus 2020-12-09 21:29:58 +00:00
parent 4c61e35f20
commit ef33047a8b
4 changed files with 17 additions and 6 deletions

3
gcc/config/aarch64/aarch64-option-extensions.def

@ -229,4 +229,7 @@ AARCH64_OPT_EXTENSION("bf16", AARCH64_FL_BF16, \
/* Enabling/Disabling "flagm" only changes "flagm". */
AARCH64_OPT_EXTENSION("flagm", AARCH64_FL_FLAGM, 0, 0, false, "flagm")
/* Enabling/Disabling "pauth" only changes "pauth". */
AARCH64_OPT_EXTENSION("pauth", AARCH64_FL_PAUTH, 0, 0, false, "paca pacg")
#undef AARCH64_OPT_EXTENSION

9
gcc/config/aarch64/aarch64.h

@ -227,6 +227,9 @@ extern unsigned aarch64_architecture_version;
/* Flag Manipulation Instructions (FLAGM) extension. */
#define AARCH64_FL_FLAGM (1ULL << 39)
/* Pointer Authentication (PAUTH) extension. */
#define AARCH64_FL_PAUTH (1ULL << 40)
/* Has FP and SIMD. */
#define AARCH64_FL_FPSIMD (AARCH64_FL_FP | AARCH64_FL_SIMD)
@ -241,7 +244,7 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_FL_FOR_ARCH8_2 \
(AARCH64_FL_FOR_ARCH8_1 | AARCH64_FL_V8_2)
#define AARCH64_FL_FOR_ARCH8_3 \
(AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_V8_3)
(AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_V8_3 | AARCH64_FL_PAUTH)
#define AARCH64_FL_FOR_ARCH8_4 \
(AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_V8_4 | AARCH64_FL_F16FML \
| AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4 | AARCH64_FL_FLAGM)
@ -290,6 +293,7 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_ISA_BF16 (aarch64_isa_flags & AARCH64_FL_BF16)
#define AARCH64_ISA_SB (aarch64_isa_flags & AARCH64_FL_SB)
#define AARCH64_ISA_V8_R (aarch64_isa_flags & AARCH64_FL_V8_R)
#define AARCH64_ISA_PAUTH (aarch64_isa_flags & AARCH64_FL_PAUTH)
/* Crypto is an optional extension to AdvSIMD. */
#define TARGET_CRYPTO (TARGET_SIMD && AARCH64_ISA_CRYPTO)
@ -378,6 +382,9 @@ extern unsigned aarch64_architecture_version;
#define TARGET_BF16_SIMD (AARCH64_ISA_BF16 && TARGET_SIMD)
#define TARGET_SVE_BF16 (TARGET_SVE && AARCH64_ISA_BF16)
/* PAUTH instructions are enabled through +pauth. */
#define TARGET_PAUTH (AARCH64_ISA_PAUTH)
/* Make sure this is always defined so we don't have to check for ifdefs
but rather use normal ifs. */
#ifndef TARGET_FIX_ERR_A53_835769_DEFAULT

2
gcc/config/aarch64/aarch64.md

@ -873,7 +873,7 @@
{
const char *ret = NULL;
if (aarch64_return_address_signing_enabled ()
&& TARGET_ARMV8_3
&& (TARGET_PAUTH)
&& !crtl->calls_eh_return)
{
if (aarch64_ra_sign_key == AARCH64_KEY_B)

9
gcc/doc/invoke.texi

@ -18016,8 +18016,8 @@ and the features that they enable by default:
@item @samp{armv8-a} @tab Armv8-A @tab @samp{+fp}, @samp{+simd}
@item @samp{armv8.1-a} @tab Armv8.1-A @tab @samp{armv8-a}, @samp{+crc}, @samp{+lse}, @samp{+rdma}
@item @samp{armv8.2-a} @tab Armv8.2-A @tab @samp{armv8.1-a}
@item @samp{armv8.3-a} @tab Armv8.3-A @tab @samp{armv8.2-a}
@item @samp{armv8.4-a} @tab Armv8.4-A @tab @samp{armv8.3-a}, @samp{+fp16fml}, @samp{+dotprod}
@item @samp{armv8.3-a} @tab Armv8.3-A @tab @samp{armv8.2-a}, @samp{+pauth}
@item @samp{armv8.4-a} @tab Armv8.4-A @tab @samp{armv8.3-a}, @samp{+flagm}, @samp{+fp16fml}, @samp{+dotprod}
@item @samp{armv8.5-a} @tab Armv8.5-A @tab @samp{armv8.4-a}, @samp{+sb}, @samp{+ssbs}, @samp{+predres}
@item @samp{armv8.6-a} @tab Armv8.6-A @tab @samp{armv8.5-a}, @samp{+bf16}, @samp{+i8mm}
@item @samp{armv8-r} @tab Armv8-R @tab @samp{armv8-r}
@ -18288,8 +18288,9 @@ Advanced SIMD and floating-point instructions. This option is enabled by
default for @option{-march=armv8.6-a}. Use of this option with architectures
prior to Armv8.2-A is not supported.
@item flagm
Enable the Flag Manipulation instructions Extension. This option is enabled by
default for @option{-march=armv8.4-a}.
Enable the Flag Manipulation instructions Extension.
@item pauth
Enable the Pointer Authentication Extension.
@end table