+const int NumMiscRegs = NUM_MISCREGS;
+
+enum CSRIndex {
+ CSR_USTATUS = 0x000,
+ CSR_UIE = 0x004,
+ CSR_UTVEC = 0x005,
+ CSR_USCRATCH = 0x040,
+ CSR_UEPC = 0x041,
+ CSR_UCAUSE = 0x042,
+ CSR_UTVAL = 0x043,
+ CSR_UIP = 0x044,
+ CSR_FFLAGS = 0x001,
+ CSR_FRM = 0x002,
+ CSR_FCSR = 0x003,
+ CSR_CYCLE = 0xC00,
+ CSR_TIME = 0xC01,
+ CSR_INSTRET = 0xC02,
+ CSR_HPMCOUNTER03 = 0xC03,
+ CSR_HPMCOUNTER04 = 0xC04,
+ CSR_HPMCOUNTER05 = 0xC05,
+ CSR_HPMCOUNTER06 = 0xC06,
+ CSR_HPMCOUNTER07 = 0xC07,
+ CSR_HPMCOUNTER08 = 0xC08,
+ CSR_HPMCOUNTER09 = 0xC09,
+ CSR_HPMCOUNTER10 = 0xC0A,
+ CSR_HPMCOUNTER11 = 0xC0B,
+ CSR_HPMCOUNTER12 = 0xC0C,
+ CSR_HPMCOUNTER13 = 0xC0D,
+ CSR_HPMCOUNTER14 = 0xC0E,
+ CSR_HPMCOUNTER15 = 0xC0F,
+ CSR_HPMCOUNTER16 = 0xC10,
+ CSR_HPMCOUNTER17 = 0xC11,
+ CSR_HPMCOUNTER18 = 0xC12,
+ CSR_HPMCOUNTER19 = 0xC13,
+ CSR_HPMCOUNTER20 = 0xC14,
+ CSR_HPMCOUNTER21 = 0xC15,
+ CSR_HPMCOUNTER22 = 0xC16,
+ CSR_HPMCOUNTER23 = 0xC17,
+ CSR_HPMCOUNTER24 = 0xC18,
+ CSR_HPMCOUNTER25 = 0xC19,
+ CSR_HPMCOUNTER26 = 0xC1A,
+ CSR_HPMCOUNTER27 = 0xC1B,
+ CSR_HPMCOUNTER28 = 0xC1C,
+ CSR_HPMCOUNTER29 = 0xC1D,
+ CSR_HPMCOUNTER30 = 0xC1E,
+ CSR_HPMCOUNTER31 = 0xC1F,
+ // HPMCOUNTERH rv32 only
+
+ CSR_SSTATUS = 0x100,
+ CSR_SEDELEG = 0x102,
+ CSR_SIDELEG = 0x103,
+ CSR_SIE = 0x104,
+ CSR_STVEC = 0x105,
+ CSR_SSCRATCH = 0x140,
+ CSR_SEPC = 0x141,
+ CSR_SCAUSE = 0x142,
+ CSR_STVAL = 0x143,
+ CSR_SIP = 0x144,
+ CSR_SATP = 0x180,
+
+ CSR_MVENDORID = 0xF11,
+ CSR_MARCHID = 0xF12,
+ CSR_MIMPID = 0xF13,
+ CSR_MHARTID = 0xF14,
+ CSR_MSTATUS = 0x300,
+ CSR_MISA = 0x301,
+ CSR_MEDELEG = 0x302,
+ CSR_MIDELEG = 0x303,
+ CSR_MIE = 0x304,
+ CSR_MTVEC = 0x305,
+ CSR_MSCRATCH = 0x340,
+ CSR_MEPC = 0x341,
+ CSR_MCAUSE = 0x342,
+ CSR_MTVAL = 0x343,
+ CSR_MIP = 0x344,
+ CSR_PMPCFG0 = 0x3A0,
+ // pmpcfg1 rv32 only
+ CSR_PMPCFG2 = 0x3A2,
+ // pmpcfg3 rv32 only
+ CSR_PMPADDR00 = 0x3B0,
+ CSR_PMPADDR01 = 0x3B1,
+ CSR_PMPADDR02 = 0x3B2,
+ CSR_PMPADDR03 = 0x3B3,
+ CSR_PMPADDR04 = 0x3B4,
+ CSR_PMPADDR05 = 0x3B5,
+ CSR_PMPADDR06 = 0x3B6,
+ CSR_PMPADDR07 = 0x3B7,
+ CSR_PMPADDR08 = 0x3B8,
+ CSR_PMPADDR09 = 0x3B9,
+ CSR_PMPADDR10 = 0x3BA,
+ CSR_PMPADDR11 = 0x3BB,
+ CSR_PMPADDR12 = 0x3BC,
+ CSR_PMPADDR13 = 0x3BD,
+ CSR_PMPADDR14 = 0x3BE,
+ CSR_PMPADDR15 = 0x3BF,
+ CSR_MCYCLE = 0xB00,
+ CSR_MINSTRET = 0xB02,
+ CSR_MHPMCOUNTER03 = 0xC03,
+ CSR_MHPMCOUNTER04 = 0xC04,
+ CSR_MHPMCOUNTER05 = 0xC05,
+ CSR_MHPMCOUNTER06 = 0xC06,
+ CSR_MHPMCOUNTER07 = 0xC07,
+ CSR_MHPMCOUNTER08 = 0xC08,
+ CSR_MHPMCOUNTER09 = 0xC09,
+ CSR_MHPMCOUNTER10 = 0xC0A,
+ CSR_MHPMCOUNTER11 = 0xC0B,
+ CSR_MHPMCOUNTER12 = 0xC0C,
+ CSR_MHPMCOUNTER13 = 0xC0D,
+ CSR_MHPMCOUNTER14 = 0xC0E,
+ CSR_MHPMCOUNTER15 = 0xC0F,
+ CSR_MHPMCOUNTER16 = 0xC10,
+ CSR_MHPMCOUNTER17 = 0xC11,
+ CSR_MHPMCOUNTER18 = 0xC12,
+ CSR_MHPMCOUNTER19 = 0xC13,
+ CSR_MHPMCOUNTER20 = 0xC14,
+ CSR_MHPMCOUNTER21 = 0xC15,
+ CSR_MHPMCOUNTER22 = 0xC16,
+ CSR_MHPMCOUNTER23 = 0xC17,
+ CSR_MHPMCOUNTER24 = 0xC18,
+ CSR_MHPMCOUNTER25 = 0xC19,
+ CSR_MHPMCOUNTER26 = 0xC1A,
+ CSR_MHPMCOUNTER27 = 0xC1B,
+ CSR_MHPMCOUNTER28 = 0xC1C,
+ CSR_MHPMCOUNTER29 = 0xC1D,
+ CSR_MHPMCOUNTER30 = 0xC1E,
+ CSR_MHPMCOUNTER31 = 0xC1F,
+ // MHPMCOUNTERH rv32 only
+ CSR_MHPMEVENT03 = 0x323,
+ CSR_MHPMEVENT04 = 0x324,
+ CSR_MHPMEVENT05 = 0x325,
+ CSR_MHPMEVENT06 = 0x326,
+ CSR_MHPMEVENT07 = 0x327,
+ CSR_MHPMEVENT08 = 0x328,
+ CSR_MHPMEVENT09 = 0x329,
+ CSR_MHPMEVENT10 = 0x32A,
+ CSR_MHPMEVENT11 = 0x32B,
+ CSR_MHPMEVENT12 = 0x32C,
+ CSR_MHPMEVENT13 = 0x32D,
+ CSR_MHPMEVENT14 = 0x32E,
+ CSR_MHPMEVENT15 = 0x32F,
+ CSR_MHPMEVENT16 = 0x330,
+ CSR_MHPMEVENT17 = 0x331,
+ CSR_MHPMEVENT18 = 0x332,
+ CSR_MHPMEVENT19 = 0x333,
+ CSR_MHPMEVENT20 = 0x334,
+ CSR_MHPMEVENT21 = 0x335,
+ CSR_MHPMEVENT22 = 0x336,
+ CSR_MHPMEVENT23 = 0x337,
+ CSR_MHPMEVENT24 = 0x338,
+ CSR_MHPMEVENT25 = 0x339,
+ CSR_MHPMEVENT26 = 0x33A,
+ CSR_MHPMEVENT27 = 0x33B,
+ CSR_MHPMEVENT28 = 0x33C,
+ CSR_MHPMEVENT29 = 0x33D,
+ CSR_MHPMEVENT30 = 0x33E,
+ CSR_MHPMEVENT31 = 0x33F,
+
+ CSR_TSELECT = 0x7A0,
+ CSR_TDATA1 = 0x7A1,
+ CSR_TDATA2 = 0x7A2,
+ CSR_TDATA3 = 0x7A3,
+ CSR_DCSR = 0x7B0,
+ CSR_DPC = 0x7B1,
+ CSR_DSCRATCH = 0x7B2
+};
+
+struct CSRMetadata
+{
+ const std::string name;
+ const int physIndex;
+};
+
+const std::map<int, CSRMetadata> CSRData = {
+ {CSR_USTATUS, {"ustatus", MISCREG_STATUS}},
+ {CSR_UIE, {"uie", MISCREG_IE}},
+ {CSR_UTVEC, {"utvec", MISCREG_UTVEC}},
+ {CSR_USCRATCH, {"uscratch", MISCREG_USCRATCH}},
+ {CSR_UEPC, {"uepc", MISCREG_UEPC}},
+ {CSR_UCAUSE, {"ucause", MISCREG_UCAUSE}},
+ {CSR_UTVAL, {"utval", MISCREG_UTVAL}},
+ {CSR_UIP, {"uip", MISCREG_IP}},
+ {CSR_FFLAGS, {"fflags", MISCREG_FFLAGS}},
+ {CSR_FRM, {"frm", MISCREG_FRM}},
+ {CSR_FCSR, {"fcsr", MISCREG_FFLAGS}}, // Actually FRM << 5 | FFLAGS
+ {CSR_CYCLE, {"cycle", MISCREG_CYCLE}},
+ {CSR_TIME, {"time", MISCREG_TIME}},
+ {CSR_INSTRET, {"instret", MISCREG_INSTRET}},
+ {CSR_HPMCOUNTER03, {"hpmcounter03", MISCREG_HPMCOUNTER03}},
+ {CSR_HPMCOUNTER04, {"hpmcounter04", MISCREG_HPMCOUNTER04}},
+ {CSR_HPMCOUNTER05, {"hpmcounter05", MISCREG_HPMCOUNTER05}},
+ {CSR_HPMCOUNTER06, {"hpmcounter06", MISCREG_HPMCOUNTER06}},
+ {CSR_HPMCOUNTER07, {"hpmcounter07", MISCREG_HPMCOUNTER07}},
+ {CSR_HPMCOUNTER08, {"hpmcounter08", MISCREG_HPMCOUNTER08}},
+ {CSR_HPMCOUNTER09, {"hpmcounter09", MISCREG_HPMCOUNTER09}},
+ {CSR_HPMCOUNTER10, {"hpmcounter10", MISCREG_HPMCOUNTER10}},
+ {CSR_HPMCOUNTER11, {"hpmcounter11", MISCREG_HPMCOUNTER11}},
+ {CSR_HPMCOUNTER12, {"hpmcounter12", MISCREG_HPMCOUNTER12}},
+ {CSR_HPMCOUNTER13, {"hpmcounter13", MISCREG_HPMCOUNTER13}},
+ {CSR_HPMCOUNTER14, {"hpmcounter14", MISCREG_HPMCOUNTER14}},
+ {CSR_HPMCOUNTER15, {"hpmcounter15", MISCREG_HPMCOUNTER15}},
+ {CSR_HPMCOUNTER16, {"hpmcounter16", MISCREG_HPMCOUNTER16}},
+ {CSR_HPMCOUNTER17, {"hpmcounter17", MISCREG_HPMCOUNTER17}},
+ {CSR_HPMCOUNTER18, {"hpmcounter18", MISCREG_HPMCOUNTER18}},
+ {CSR_HPMCOUNTER19, {"hpmcounter19", MISCREG_HPMCOUNTER19}},
+ {CSR_HPMCOUNTER20, {"hpmcounter20", MISCREG_HPMCOUNTER20}},
+ {CSR_HPMCOUNTER21, {"hpmcounter21", MISCREG_HPMCOUNTER21}},
+ {CSR_HPMCOUNTER22, {"hpmcounter22", MISCREG_HPMCOUNTER22}},
+ {CSR_HPMCOUNTER23, {"hpmcounter23", MISCREG_HPMCOUNTER23}},
+ {CSR_HPMCOUNTER24, {"hpmcounter24", MISCREG_HPMCOUNTER24}},
+ {CSR_HPMCOUNTER25, {"hpmcounter25", MISCREG_HPMCOUNTER25}},
+ {CSR_HPMCOUNTER26, {"hpmcounter26", MISCREG_HPMCOUNTER26}},
+ {CSR_HPMCOUNTER27, {"hpmcounter27", MISCREG_HPMCOUNTER27}},
+ {CSR_HPMCOUNTER28, {"hpmcounter28", MISCREG_HPMCOUNTER28}},
+ {CSR_HPMCOUNTER29, {"hpmcounter29", MISCREG_HPMCOUNTER29}},
+ {CSR_HPMCOUNTER30, {"hpmcounter30", MISCREG_HPMCOUNTER30}},
+ {CSR_HPMCOUNTER31, {"hpmcounter31", MISCREG_HPMCOUNTER31}},
+
+ {CSR_SSTATUS, {"sstatus", MISCREG_STATUS}},
+ {CSR_SEDELEG, {"sedeleg", MISCREG_SEDELEG}},
+ {CSR_SIDELEG, {"sideleg", MISCREG_SIDELEG}},
+ {CSR_SIE, {"sie", MISCREG_IE}},
+ {CSR_STVEC, {"stvec", MISCREG_STVEC}},
+ {CSR_SSCRATCH, {"sscratch", MISCREG_SSCRATCH}},
+ {CSR_SEPC, {"sepc", MISCREG_SEPC}},
+ {CSR_SCAUSE, {"scause", MISCREG_SCAUSE}},
+ {CSR_STVAL, {"stval", MISCREG_STVAL}},
+ {CSR_SIP, {"sip", MISCREG_IP}},
+ {CSR_SATP, {"satp", MISCREG_SATP}},
+
+ {CSR_MVENDORID, {"mvendorid", MISCREG_VENDORID}},
+ {CSR_MARCHID, {"marchid", MISCREG_ARCHID}},
+ {CSR_MIMPID, {"mimpid", MISCREG_IMPID}},
+ {CSR_MHARTID, {"mhartid", MISCREG_HARTID}},
+ {CSR_MSTATUS, {"mstatus", MISCREG_STATUS}},
+ {CSR_MISA, {"misa", MISCREG_ISA}},
+ {CSR_MEDELEG, {"medeleg", MISCREG_MEDELEG}},
+ {CSR_MIDELEG, {"mideleg", MISCREG_MIDELEG}},
+ {CSR_MIE, {"mie", MISCREG_IE}},
+ {CSR_MTVEC, {"mtvec", MISCREG_MTVEC}},
+ {CSR_MSCRATCH, {"mscratch", MISCREG_MSCRATCH}},
+ {CSR_MEPC, {"mepc", MISCREG_MEPC}},
+ {CSR_MCAUSE, {"mcause", MISCREG_MCAUSE}},
+ {CSR_MTVAL, {"mtval", MISCREG_MTVAL}},
+ {CSR_MIP, {"mip", MISCREG_IP}},
+ {CSR_PMPCFG0, {"pmpcfg0", MISCREG_PMPCFG0}},
+ // pmpcfg1 rv32 only
+ {CSR_PMPCFG2, {"pmpcfg2", MISCREG_PMPCFG2}},
+ // pmpcfg3 rv32 only
+ {CSR_PMPADDR00, {"pmpaddr0", MISCREG_PMPADDR00}},
+ {CSR_PMPADDR01, {"pmpaddr1", MISCREG_PMPADDR01}},
+ {CSR_PMPADDR02, {"pmpaddr2", MISCREG_PMPADDR02}},
+ {CSR_PMPADDR03, {"pmpaddr3", MISCREG_PMPADDR03}},
+ {CSR_PMPADDR04, {"pmpaddr4", MISCREG_PMPADDR04}},
+ {CSR_PMPADDR05, {"pmpaddr5", MISCREG_PMPADDR05}},
+ {CSR_PMPADDR06, {"pmpaddr6", MISCREG_PMPADDR06}},
+ {CSR_PMPADDR07, {"pmpaddr7", MISCREG_PMPADDR07}},
+ {CSR_PMPADDR08, {"pmpaddr8", MISCREG_PMPADDR08}},
+ {CSR_PMPADDR09, {"pmpaddr9", MISCREG_PMPADDR09}},
+ {CSR_PMPADDR10, {"pmpaddr10", MISCREG_PMPADDR10}},
+ {CSR_PMPADDR11, {"pmpaddr11", MISCREG_PMPADDR11}},
+ {CSR_PMPADDR12, {"pmpaddr12", MISCREG_PMPADDR12}},
+ {CSR_PMPADDR13, {"pmpaddr13", MISCREG_PMPADDR13}},
+ {CSR_PMPADDR14, {"pmpaddr14", MISCREG_PMPADDR14}},
+ {CSR_PMPADDR15, {"pmpaddr15", MISCREG_PMPADDR15}},
+ {CSR_MCYCLE, {"mcycle", MISCREG_CYCLE}},
+ {CSR_MINSTRET, {"minstret", MISCREG_INSTRET}},
+ {CSR_MHPMCOUNTER03, {"mhpmcounter03", MISCREG_HPMCOUNTER03}},
+ {CSR_MHPMCOUNTER04, {"mhpmcounter04", MISCREG_HPMCOUNTER04}},
+ {CSR_MHPMCOUNTER05, {"mhpmcounter05", MISCREG_HPMCOUNTER05}},
+ {CSR_MHPMCOUNTER06, {"mhpmcounter06", MISCREG_HPMCOUNTER06}},
+ {CSR_MHPMCOUNTER07, {"mhpmcounter07", MISCREG_HPMCOUNTER07}},
+ {CSR_MHPMCOUNTER08, {"mhpmcounter08", MISCREG_HPMCOUNTER08}},
+ {CSR_MHPMCOUNTER09, {"mhpmcounter09", MISCREG_HPMCOUNTER09}},
+ {CSR_MHPMCOUNTER10, {"mhpmcounter10", MISCREG_HPMCOUNTER10}},
+ {CSR_MHPMCOUNTER11, {"mhpmcounter11", MISCREG_HPMCOUNTER11}},
+ {CSR_MHPMCOUNTER12, {"mhpmcounter12", MISCREG_HPMCOUNTER12}},
+ {CSR_MHPMCOUNTER13, {"mhpmcounter13", MISCREG_HPMCOUNTER13}},
+ {CSR_MHPMCOUNTER14, {"mhpmcounter14", MISCREG_HPMCOUNTER14}},
+ {CSR_MHPMCOUNTER15, {"mhpmcounter15", MISCREG_HPMCOUNTER15}},
+ {CSR_MHPMCOUNTER16, {"mhpmcounter16", MISCREG_HPMCOUNTER16}},
+ {CSR_MHPMCOUNTER17, {"mhpmcounter17", MISCREG_HPMCOUNTER17}},
+ {CSR_MHPMCOUNTER18, {"mhpmcounter18", MISCREG_HPMCOUNTER18}},
+ {CSR_MHPMCOUNTER19, {"mhpmcounter19", MISCREG_HPMCOUNTER19}},
+ {CSR_MHPMCOUNTER20, {"mhpmcounter20", MISCREG_HPMCOUNTER20}},
+ {CSR_MHPMCOUNTER21, {"mhpmcounter21", MISCREG_HPMCOUNTER21}},
+ {CSR_MHPMCOUNTER22, {"mhpmcounter22", MISCREG_HPMCOUNTER22}},
+ {CSR_MHPMCOUNTER23, {"mhpmcounter23", MISCREG_HPMCOUNTER23}},
+ {CSR_MHPMCOUNTER24, {"mhpmcounter24", MISCREG_HPMCOUNTER24}},
+ {CSR_MHPMCOUNTER25, {"mhpmcounter25", MISCREG_HPMCOUNTER25}},
+ {CSR_MHPMCOUNTER26, {"mhpmcounter26", MISCREG_HPMCOUNTER26}},
+ {CSR_MHPMCOUNTER27, {"mhpmcounter27", MISCREG_HPMCOUNTER27}},
+ {CSR_MHPMCOUNTER28, {"mhpmcounter28", MISCREG_HPMCOUNTER28}},
+ {CSR_MHPMCOUNTER29, {"mhpmcounter29", MISCREG_HPMCOUNTER29}},
+ {CSR_MHPMCOUNTER30, {"mhpmcounter30", MISCREG_HPMCOUNTER30}},
+ {CSR_MHPMCOUNTER31, {"mhpmcounter31", MISCREG_HPMCOUNTER31}},
+ {CSR_MHPMEVENT03, {"mhpmevent03", MISCREG_HPMEVENT03}},
+ {CSR_MHPMEVENT04, {"mhpmevent04", MISCREG_HPMEVENT04}},
+ {CSR_MHPMEVENT05, {"mhpmevent05", MISCREG_HPMEVENT05}},
+ {CSR_MHPMEVENT06, {"mhpmevent06", MISCREG_HPMEVENT06}},
+ {CSR_MHPMEVENT07, {"mhpmevent07", MISCREG_HPMEVENT07}},
+ {CSR_MHPMEVENT08, {"mhpmevent08", MISCREG_HPMEVENT08}},
+ {CSR_MHPMEVENT09, {"mhpmevent09", MISCREG_HPMEVENT09}},
+ {CSR_MHPMEVENT10, {"mhpmevent10", MISCREG_HPMEVENT10}},
+ {CSR_MHPMEVENT11, {"mhpmevent11", MISCREG_HPMEVENT11}},
+ {CSR_MHPMEVENT12, {"mhpmevent12", MISCREG_HPMEVENT12}},
+ {CSR_MHPMEVENT13, {"mhpmevent13", MISCREG_HPMEVENT13}},
+ {CSR_MHPMEVENT14, {"mhpmevent14", MISCREG_HPMEVENT14}},
+ {CSR_MHPMEVENT15, {"mhpmevent15", MISCREG_HPMEVENT15}},
+ {CSR_MHPMEVENT16, {"mhpmevent16", MISCREG_HPMEVENT16}},
+ {CSR_MHPMEVENT17, {"mhpmevent17", MISCREG_HPMEVENT17}},
+ {CSR_MHPMEVENT18, {"mhpmevent18", MISCREG_HPMEVENT18}},
+ {CSR_MHPMEVENT19, {"mhpmevent19", MISCREG_HPMEVENT19}},
+ {CSR_MHPMEVENT20, {"mhpmevent20", MISCREG_HPMEVENT20}},
+ {CSR_MHPMEVENT21, {"mhpmevent21", MISCREG_HPMEVENT21}},
+ {CSR_MHPMEVENT22, {"mhpmevent22", MISCREG_HPMEVENT22}},
+ {CSR_MHPMEVENT23, {"mhpmevent23", MISCREG_HPMEVENT23}},
+ {CSR_MHPMEVENT24, {"mhpmevent24", MISCREG_HPMEVENT24}},
+ {CSR_MHPMEVENT25, {"mhpmevent25", MISCREG_HPMEVENT25}},
+ {CSR_MHPMEVENT26, {"mhpmevent26", MISCREG_HPMEVENT26}},
+ {CSR_MHPMEVENT27, {"mhpmevent27", MISCREG_HPMEVENT27}},
+ {CSR_MHPMEVENT28, {"mhpmevent28", MISCREG_HPMEVENT28}},
+ {CSR_MHPMEVENT29, {"mhpmevent29", MISCREG_HPMEVENT29}},
+ {CSR_MHPMEVENT30, {"mhpmevent30", MISCREG_HPMEVENT30}},
+ {CSR_MHPMEVENT31, {"mhpmevent31", MISCREG_HPMEVENT31}},
+
+ {CSR_TSELECT, {"tselect", MISCREG_TSELECT}},
+ {CSR_TDATA1, {"tdata1", MISCREG_TDATA1}},
+ {CSR_TDATA2, {"tdata2", MISCREG_TDATA2}},
+ {CSR_TDATA3, {"tdata3", MISCREG_TDATA3}},
+ {CSR_DCSR, {"dcsr", MISCREG_DCSR}},
+ {CSR_DPC, {"dpc", MISCREG_DPC}},
+ {CSR_DSCRATCH, {"dscratch", MISCREG_DSCRATCH}}
+};
+
+/**
+ * These fields are specified in the RISC-V Instruction Set Manual, Volume II,
+ * v1.10, accessible at www.riscv.org. in Figure 3.7. The main register that
+ * uses these fields is the MSTATUS register, which is shadowed by two others
+ * accessible at lower privilege levels (SSTATUS and USTATUS) that can't see
+ * the fields for higher privileges.
+ */
+BitUnion64(STATUS)
+ Bitfield<63> sd;
+ Bitfield<35, 34> sxl;
+ Bitfield<33, 32> uxl;
+ Bitfield<22> tsr;
+ Bitfield<21> tw;
+ Bitfield<20> tvm;
+ Bitfield<19> mxr;
+ Bitfield<18> sum;
+ Bitfield<17> mprv;
+ Bitfield<16, 15> xs;
+ Bitfield<14, 13> fs;
+ Bitfield<12, 11> mpp;
+ Bitfield<8> spp;
+ Bitfield<7> mpie;
+ Bitfield<5> spie;
+ Bitfield<4> upie;
+ Bitfield<3> mie;
+ Bitfield<1> sie;
+ Bitfield<0> uie;
+EndBitUnion(STATUS)
+
+/**
+ * These fields are specified in the RISC-V Instruction Set Manual, Volume II,
+ * v1.10 in Figures 3.11 and 3.12, accessible at www.riscv.org. Both the MIP
+ * and MIE registers have the same fields, so accesses to either should use
+ * this bit union.
+ */
+BitUnion64(INTERRUPT)
+ Bitfield<11> mei;
+ Bitfield<9> sei;
+ Bitfield<8> uei;
+ Bitfield<7> mti;
+ Bitfield<5> sti;
+ Bitfield<4> uti;
+ Bitfield<3> msi;
+ Bitfield<1> ssi;
+ Bitfield<0> usi;
+EndBitUnion(INTERRUPT)
+
+const off_t MXL_OFFSET = (sizeof(MiscReg) * 8 - 2);
+const off_t SXL_OFFSET = 34;
+const off_t UXL_OFFSET = 32;
+const off_t FS_OFFSET = 13;
+const off_t FRM_OFFSET = 5;
+
+const MiscReg ISA_MXL_MASK = 3ULL << MXL_OFFSET;
+const MiscReg ISA_EXT_MASK = mask(26);
+const MiscReg MISA_MASK = ISA_MXL_MASK | ISA_EXT_MASK;
+
+const MiscReg STATUS_SD_MASK = 1ULL << ((sizeof(MiscReg) * 8) - 1);
+const MiscReg STATUS_SXL_MASK = 3ULL << SXL_OFFSET;
+const MiscReg STATUS_UXL_MASK = 3ULL << UXL_OFFSET;
+const MiscReg STATUS_TSR_MASK = 1ULL << 22;
+const MiscReg STATUS_TW_MASK = 1ULL << 21;
+const MiscReg STATUS_TVM_MASK = 1ULL << 20;
+const MiscReg STATUS_MXR_MASK = 1ULL << 19;
+const MiscReg STATUS_SUM_MASK = 1ULL << 18;
+const MiscReg STATUS_MPRV_MASK = 1ULL << 17;
+const MiscReg STATUS_XS_MASK = 3ULL << 15;
+const MiscReg STATUS_FS_MASK = 3ULL << FS_OFFSET;
+const MiscReg STATUS_MPP_MASK = 3ULL << 11;
+const MiscReg STATUS_SPP_MASK = 1ULL << 8;
+const MiscReg STATUS_MPIE_MASK = 1ULL << 7;
+const MiscReg STATUS_SPIE_MASK = 1ULL << 5;
+const MiscReg STATUS_UPIE_MASK = 1ULL << 4;
+const MiscReg STATUS_MIE_MASK = 1ULL << 3;
+const MiscReg STATUS_SIE_MASK = 1ULL << 1;
+const MiscReg STATUS_UIE_MASK = 1ULL << 0;
+const MiscReg MSTATUS_MASK = STATUS_SD_MASK | STATUS_SXL_MASK |
+ STATUS_UXL_MASK | STATUS_TSR_MASK |
+ STATUS_TW_MASK | STATUS_TVM_MASK |
+ STATUS_MXR_MASK | STATUS_SUM_MASK |
+ STATUS_MPRV_MASK | STATUS_XS_MASK |
+ STATUS_FS_MASK | STATUS_MPP_MASK |
+ STATUS_SPP_MASK | STATUS_MPIE_MASK |
+ STATUS_SPIE_MASK | STATUS_UPIE_MASK |
+ STATUS_MIE_MASK | STATUS_SIE_MASK |
+ STATUS_UIE_MASK;
+const MiscReg SSTATUS_MASK = STATUS_SD_MASK | STATUS_UXL_MASK |
+ STATUS_MXR_MASK | STATUS_SUM_MASK |
+ STATUS_XS_MASK | STATUS_FS_MASK |
+ STATUS_SPP_MASK | STATUS_SPIE_MASK |
+ STATUS_UPIE_MASK | STATUS_SIE_MASK |
+ STATUS_UIE_MASK;
+const MiscReg USTATUS_MASK = STATUS_SD_MASK | STATUS_MXR_MASK |
+ STATUS_SUM_MASK | STATUS_XS_MASK |
+ STATUS_FS_MASK | STATUS_UPIE_MASK |
+ STATUS_UIE_MASK;
+
+const MiscReg MEI_MASK = 1ULL << 11;
+const MiscReg SEI_MASK = 1ULL << 9;
+const MiscReg UEI_MASK = 1ULL << 8;
+const MiscReg MTI_MASK = 1ULL << 7;
+const MiscReg STI_MASK = 1ULL << 5;
+const MiscReg UTI_MASK = 1ULL << 4;
+const MiscReg MSI_MASK = 1ULL << 3;
+const MiscReg SSI_MASK = 1ULL << 1;
+const MiscReg USI_MASK = 1ULL << 0;
+const MiscReg MI_MASK = MEI_MASK | SEI_MASK | UEI_MASK |
+ MTI_MASK | STI_MASK | UTI_MASK |
+ MSI_MASK | SSI_MASK | USI_MASK;
+const MiscReg SI_MASK = SEI_MASK | UEI_MASK |
+ STI_MASK | UTI_MASK |
+ SSI_MASK | USI_MASK;
+const MiscReg UI_MASK = UEI_MASK | UTI_MASK | USI_MASK;
+const MiscReg FFLAGS_MASK = (1 << FRM_OFFSET) - 1;
+const MiscReg FRM_MASK = 0x7;