Victor Do Nascimento <victor.donascime...@arm.com> writes:
> Given the introduction of optional 128-bit page table descriptor and
> translation hardening extension support with the Arm9.4-a
> architecture, this introduces the relevant flags to enable the reading
> and writing of 128-bit system registers.
>
> The `+d128' -march modifier enables the use of the following ACLE
> builtin functions:
>
> * __uint128_t __arm_rsr128(const char *special_register);
> * void __arm_wsr128(const char *special_register, __uint128_t value);
>
> and defines the __ARM_FEATURE_SYSREG128 macro to 1.
>
> Finally, the `rcwmask_el1' and `rcwsmask_el1' 128-bit system register
> implementations are also reliant on the enablement of the `+the' flag,
> which is thus also implemented in this patch.
>
> gcc/ChangeLog:
>
> * config/aarch64/aarch64-arches.def (armv8.9-a): New.
> (armv9.4-a): Likewise.
> * config/aarch64/aarch64-option-extensions.def (d128): Likewise.
> (the): Likewise.
> * config/aarch64/aarch64.h (AARCH64_ISA_V9_4A): Likewise.
> (AARCH64_ISA_V8_9A): Likewise.
> (TARGET_ARMV9_4): Likewise.
> (AARCH64_ISA_D128): Likewise.
> (AARCH64_ISA_THE): Likewise.
> (TARGET_D128): Likewise.
> * doc/invoke.texi (AArch64 Options): Document new -march flags
> and extensions.
OK, thanks.
Richard
> ---
> gcc/config/aarch64/aarch64-arches.def | 2 ++
> gcc/config/aarch64/aarch64-c.cc | 1 +
> gcc/config/aarch64/aarch64-option-extensions.def | 4 ++++
> gcc/config/aarch64/aarch64.h | 15 +++++++++++++++
> gcc/doc/invoke.texi | 6 ++++++
> 5 files changed, 28 insertions(+)
>
> diff --git a/gcc/config/aarch64/aarch64-arches.def
> b/gcc/config/aarch64/aarch64-arches.def
> index 7ae92aa8e98..becccb801d0 100644
> --- a/gcc/config/aarch64/aarch64-arches.def
> +++ b/gcc/config/aarch64/aarch64-arches.def
> @@ -39,10 +39,12 @@ AARCH64_ARCH("armv8.5-a", generic, V8_5A,
> 8, (V8_4A, SB, SSBS, PR
> AARCH64_ARCH("armv8.6-a", generic, V8_6A, 8, (V8_5A, I8MM,
> BF16))
> AARCH64_ARCH("armv8.7-a", generic, V8_7A, 8, (V8_6A, LS64))
> AARCH64_ARCH("armv8.8-a", generic, V8_8A, 8, (V8_7A, MOPS))
> +AARCH64_ARCH("armv8.9-a", generic, V8_9A, 8, (V8_8A))
> AARCH64_ARCH("armv8-r", generic, V8R , 8, (V8_4A))
> AARCH64_ARCH("armv9-a", generic, V9A , 9, (V8_5A, SVE2))
> AARCH64_ARCH("armv9.1-a", generic, V9_1A, 9, (V8_6A, V9A))
> AARCH64_ARCH("armv9.2-a", generic, V9_2A, 9, (V8_7A, V9_1A))
> AARCH64_ARCH("armv9.3-a", generic, V9_3A, 9, (V8_8A, V9_2A))
> +AARCH64_ARCH("armv9.4-a", generic, V9_4A, 9, (V8_9A, V9_3A))
>
> #undef AARCH64_ARCH
> diff --git a/gcc/config/aarch64/aarch64-c.cc b/gcc/config/aarch64/aarch64-c.cc
> index be8b7236cf9..cacf8e8ed25 100644
> --- a/gcc/config/aarch64/aarch64-c.cc
> +++ b/gcc/config/aarch64/aarch64-c.cc
> @@ -206,6 +206,7 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
> aarch64_def_or_undef (TARGET_LS64,
> "__ARM_FEATURE_LS64", pfile);
> aarch64_def_or_undef (AARCH64_ISA_RCPC, "__ARM_FEATURE_RCPC", pfile);
> + aarch64_def_or_undef (TARGET_D128, "__ARM_FEATURE_SYSREG128", pfile);
>
> /* Not for ACLE, but required to keep "float.h" correct if we switch
> target between implementations that do or do not support ARMv8.2-A
> diff --git a/gcc/config/aarch64/aarch64-option-extensions.def
> b/gcc/config/aarch64/aarch64-option-extensions.def
> index 825f3bf7758..da31f7c32d1 100644
> --- a/gcc/config/aarch64/aarch64-option-extensions.def
> +++ b/gcc/config/aarch64/aarch64-option-extensions.def
> @@ -151,4 +151,8 @@ AARCH64_OPT_EXTENSION("mops", MOPS, (), (), (), "")
>
> AARCH64_OPT_EXTENSION("cssc", CSSC, (), (), (), "cssc")
>
> +AARCH64_OPT_EXTENSION("d128", D128, (), (), (), "d128")
> +
> +AARCH64_OPT_EXTENSION("the", THE, (), (), (), "the")
> +
> #undef AARCH64_OPT_EXTENSION
> diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
> index 84e6f79ca83..1b3c800ec89 100644
> --- a/gcc/config/aarch64/aarch64.h
> +++ b/gcc/config/aarch64/aarch64.h
> @@ -219,13 +219,17 @@ enum class aarch64_feature : unsigned char {
> #define AARCH64_ISA_PAUTH (aarch64_isa_flags & AARCH64_FL_PAUTH)
> #define AARCH64_ISA_V8_7A (aarch64_isa_flags & AARCH64_FL_V8_7A)
> #define AARCH64_ISA_V8_8A (aarch64_isa_flags & AARCH64_FL_V8_8A)
> +#define AARCH64_ISA_V8_9A (aarch64_isa_flags & AARCH64_FL_V8_9A)
> #define AARCH64_ISA_V9A (aarch64_isa_flags & AARCH64_FL_V9A)
> #define AARCH64_ISA_V9_1A (aarch64_isa_flags & AARCH64_FL_V9_1A)
> #define AARCH64_ISA_V9_2A (aarch64_isa_flags & AARCH64_FL_V9_2A)
> #define AARCH64_ISA_V9_3A (aarch64_isa_flags & AARCH64_FL_V9_3A)
> +#define AARCH64_ISA_V9_4A (aarch64_isa_flags & AARCH64_FL_V9_4A)
> #define AARCH64_ISA_MOPS (aarch64_isa_flags & AARCH64_FL_MOPS)
> #define AARCH64_ISA_LS64 (aarch64_isa_flags & AARCH64_FL_LS64)
> #define AARCH64_ISA_CSSC (aarch64_isa_flags & AARCH64_FL_CSSC)
> +#define AARCH64_ISA_D128 (aarch64_isa_flags & AARCH64_FL_D128)
> +#define AARCH64_ISA_THE (aarch64_isa_flags & AARCH64_FL_THE)
>
> /* AARCH64_FL options necessary for system register implementation. */
>
> @@ -388,6 +392,17 @@ enum class aarch64_feature : unsigned char {
> /* ARMv8.1-A Adv.SIMD support. */
> #define TARGET_SIMD_RDMA (TARGET_SIMD && AARCH64_ISA_RDMA)
>
> +/* Armv9.4-A features. */
> +#define TARGET_ARMV9_4 (AARCH64_ISA_V9_4A)
> +
> +/* 128-bit System Registers and Instructions from Armv9.4-a are enabled
> + through +d128. */
> +#define TARGET_D128 (AARCH64_ISA_D128)
> +
> +/* Armv8.9-A/9.4-A Translation Hardening Extension system registers are
> + enabled through +the. */
> +#define TARGET_THE (AARCH64_ISA_THE)
> +
> /* Standard register usage. */
>
> /* 31 64-bit general purpose registers R0-R30:
> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index 6e776a0faa1..88327ce9681 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -20722,10 +20722,12 @@ and the features that they enable by default:
> @item @samp{armv8.6-a} @tab Armv8.6-A @tab @samp{armv8.5-a}, @samp{+bf16},
> @samp{+i8mm}
> @item @samp{armv8.7-a} @tab Armv8.7-A @tab @samp{armv8.6-a}, @samp{+ls64}
> @item @samp{armv8.8-a} @tab Armv8.8-a @tab @samp{armv8.7-a}, @samp{+mops}
> +@item @samp{armv8.9-a} @tab Armv8.9-a @tab @samp{armv8.8-a}
> @item @samp{armv9-a} @tab Armv9-A @tab @samp{armv8.5-a}, @samp{+sve},
> @samp{+sve2}
> @item @samp{armv9.1-a} @tab Armv9.1-A @tab @samp{armv9-a}, @samp{+bf16},
> @samp{+i8mm}
> @item @samp{armv9.2-a} @tab Armv9.2-A @tab @samp{armv9.1-a}, @samp{+ls64}
> @item @samp{armv9.3-a} @tab Armv9.3-A @tab @samp{armv9.2-a}, @samp{+mops}
> +@item @samp{armv9.4-a} @tab Armv9.4-A @tab @samp{armv9.3-a}
> @item @samp{armv8-r} @tab Armv8-R @tab @samp{armv8-r}
> @end multitable
>
> @@ -21028,6 +21030,10 @@ Enable the Flag Manipulation instructions Extension.
> Enable the Pointer Authentication Extension.
> @item cssc
> Enable the Common Short Sequence Compression instructions.
> +@item d128
> +Enable support for 128-bit system register read/write instructions.
> +@item the
> +Enable support for Armv8.9-a/9.4-a translation hardening extension.
>
> @end table
