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SFENCE.VMA should be illegal in user mode

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David Harris 2022-05-05 14:59:52 +00:00
parent 9b7aab122e
commit f436e93fc5
1 changed files with 1 additions and 1 deletions
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pipelined/src/privileged/privdec.sv
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@ -51,7 +51,7 @@ module privdec (
assign ecallM = PrivilegedM & (InstrM[31:20] == 12'b000000000000);
assign ebreakM = PrivilegedM & (InstrM[31:20] == 12'b000000000001);
assign wfiM = PrivilegedM & (InstrM[31:20] == 12'b000100000101);
assign sfencevmaM = PrivilegedM & (InstrM[31:25] == 7'b0001001); // *** & (PrivilegedModeW == `M_MODE | ~STATUS_TVM); // *** does this work in U mode?
assign sfencevmaM = PrivilegedM & (InstrM[31:25] == 7'b0001001) & (PrivilegedModeW == `M_MODE | (PrivilegeModeW == `S_MODE & ~STATUS_TVM)); // *** does this work in U mode?
assign IllegalPrivilegedInstrM = PrivilegedM & ~(sretM|mretM|ecallM|ebreakM|wfiM|sfencevmaM);
assign IllegalInstrFaultM = (IllegalIEUInstrFaultM & (IllegalFPUInstrM | (STATUS_FS == 2'b00))) | IllegalPrivilegedInstrM | IllegalCSRAccessM |
TrappedSRETM | WFITimeoutM; // *** generalize this for other instructions