[PATCH v2] RISC-V: Support ssctr/smctr extensions with frozen version 1.0.

[Nelson Chu]

Committed, thanks.

Nelson

On Wed, Jan 15, 2025 at 7:59 AM Nelson Chu <nelson@rivosinc.com> wrote:

> It seems the spec was ratified two months ago, so I will merge it before
> the 2.44 branch is created this weekend.
>
> Thanks
> Nelson
>
> On Tue, Jun 18, 2024 at 12:48 PM Nelson Chu <nelson@rivosinc.com> wrote:
>
>>
>> https://github.com/riscv/riscv-control-transfer-records/releases/tag/v1.0.0_rc2
>>
>> The privileged spec v1.10 already removed the sfence.vm instruction, and
>> the
>> encoding of sfence.vm instruction is overlapped with the sctrclr
>> instruction
>> of ssctr/smctr.  But since the privileged spec v1.10 already removed the
>> sfence.vm, and we no longer support the privileged spec v1.9.1 for now, we
>> had to remove the sfence.vm.
>>
>> bfd/
>>         * elfxx-riscv.c (riscv_implicit_subsets): Imply zicsr for
>> ssctr/smctr.
>>         (riscv_supported_std_s_ext): Added ssctr/smctr with version 1.0.
>>         (riscv_multi_subset_supports): Handle INSN_CLASS for ssctr/smctr.
>>         (riscv_multi_subset_supports_ext): Likewise.
>> gas/
>>         * config/tc-riscv.c (enum riscv_csr_class, riscv_csr_address):
>>         Added and handle CSR_CLASS_SSCTR and CSR_CLASS_SMCTR.
>>         (riscv_is_priv_insn): Removed SFENCE_VM check.
>>         * testsuite/gas/riscv/attribute-14e.d: Removed since sfence.vm is
>> no
>>         longer supported since privileged spec v1.10.
>>         * testsuite/gas/riscv/attribute-14.s: Likewise.
>>         * testsuite/gas/riscv/csr-version-1p10.d: Updated for ssctr/smctr
>> CSRs.
>>         * testsuite/gas/riscv/csr-version-1p10.l: Likewise.
>>         * testsuite/gas/riscv/csr-version-1p11.d: Likewise.
>>         * testsuite/gas/riscv/csr-version-1p11.l: Likewise.
>>         * testsuite/gas/riscv/csr-version-1p12.d: Likewise.
>>         * testsuite/gas/riscv/csr-version-1p12.l: Likewise.
>>         * testsuite/gas/riscv/csr.s: Likewise.
>>         * testsuite/gas/riscv/csr-dw-regnums.d: Likewise.
>>         * testsuite/gas/riscv/csr-dw-regnums.s: Likewise.
>>         * testsuite/gas/riscv/march-help.l: Updated for ssctr/smctr.
>>         * testsuite/gas/riscv/smctr-ssctr.d: New testcase for sctr
>> instruction.
>>         * testsuite/gas/riscv/smctr-ssctr.s: Likewise.
>> include/
>>         * opcode/riscv-opc.h: Added encoding macro for sctrclr, but
>> removed
>>         encoding macro for sfence.vm since encoding conflict.  Added CSR
>>         numbers for ssctr/smctr CSRs.
>>         * opcode/riscv.h (enum riscv_insn_class): Added
>>         INSN_CLASS_SMCTR_OR_SSCTR for sctrclr.
>> opcodes/
>>         * riscv-opc.c (riscv_opcodes): Added sctrclr, but removed
>> sfence.vm
>>         since encoding conflict.
>>
>
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