8c8a7cd647
In this patch, we modify the decoder to be a freely composable data structure instead of a hardcoded one. It can be dynamically builded up according to the extensions. This approach has several benefits: 1. Provides support for heterogeneous cpu architectures. As we add decoder in RISCVCPU, each cpu can have their own decoder, and the decoders can be different due to cpu's features. 2. Improve the decoding efficiency. We run the guard_func to see if the decoder can be added to the dynamic_decoder when building up the decoder. Therefore, there is no need to run the guard_func when decoding each instruction. It can improve the decoding efficiency 3. For vendor or dynamic cpus, it allows them to customize their own decoder functions to improve decoding efficiency, especially when vendor-defined instruction sets increase. Because of dynamic building up, it can skip the other decoder guard functions when decoding. 4. Pre patch for allowing adding a vendor decoder before decode_insn32() with minimal overhead for users that don't need this particular vendor decoder. Signed-off-by: Huang Tao <eric.huang@linux.alibaba.com> Suggested-by: Christoph Muellner <christoph.muellner@vrull.eu> Co-authored-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20240506023607.29544-1-eric.huang@linux.alibaba.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*
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* riscv TCG cpu class initialization
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*
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* Copyright (c) 2023 Ventana Micro Systems Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef RISCV_TCG_CPU_H
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#define RISCV_TCG_CPU_H
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#include "cpu.h"
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void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, Error **errp);
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void riscv_tcg_cpu_finalize_features(RISCVCPU *cpu, Error **errp);
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bool riscv_cpu_tcg_compatible(RISCVCPU *cpu);
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struct DisasContext;
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struct RISCVCPUConfig;
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typedef struct RISCVDecoder {
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bool (*guard_func)(const struct RISCVCPUConfig *);
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bool (*riscv_cpu_decode_fn)(struct DisasContext *, uint32_t);
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} RISCVDecoder;
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typedef bool (*riscv_cpu_decode_fn)(struct DisasContext *, uint32_t);
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extern const size_t decoder_table_size;
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extern const RISCVDecoder decoder_table[];
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void riscv_tcg_cpu_finalize_dynamic_decoder(RISCVCPU *cpu);
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#endif
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