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decoder.sv: sfence.vma valid only if S mode supported (fix #1866) (#1869)

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André Sintzoff 2024-02-23 23:10:40 +01:00 • committed by GitHub
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commit 1474395869
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core/decoder.sv
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@ -221,8 +221,9 @@ module decoder
default: begin
if (instr.instr[31:25] == 7'b1001) begin
// check privilege level, SFENCE.VMA can only be executed in M/S mode
// only if S mode is supported
// otherwise decode an illegal instruction
illegal_instr = (((CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S) || ((!CVA6Cfg.RVS && !CVA6Cfg.RVU) || priv_lvl_i == riscv::PRIV_LVL_M)) && instr.itype.rd == '0) ? 1'b0 : 1'b1;
illegal_instr = (CVA6Cfg.RVS && (priv_lvl_i inside {riscv::PRIV_LVL_M, riscv::PRIV_LVL_S}) && instr.itype.rd == '0) ? 1'b0 : 1'b1;
instruction_o.op = ariane_pkg::SFENCE_VMA;
// check TVM flag and intercept SFENCE.VMA call if necessary
if (CVA6Cfg.RVS && priv_lvl_i == riscv::PRIV_LVL_S && tvm_i)