refine and fix TGC_C iss to becoem compliant

gen_input/CoreDSL-Instruction-Set-Description

@@ -1 +1 @@
-Subproject commit cf601042edaef9661b42a4ab295812d0eca48264
+Subproject commit 0c70a41376fb3a529e4f56a9b9d7167c9613958e

gen_input/templates/CORENAME.cpp.gtl

@@ -33,7 +33,7 @@
 def getRegisterSizes(){
 	def regs = registers.collect{it.size}
 	regs[-1]=64 // correct for NEXT_PC
-	regs+=[32, 32, 64] // append TRAP_STATE, PENDING_TRAP, ICOUNT
+	regs+=[32, 32, 64, 64, 64] // append TRAP_STATE, PENDING_TRAP, ICOUNT, CYCLE, INSTRET
     return regs
 }
 %>

gen_input/templates/CORENAME.h.gtl

@@ -37,7 +37,7 @@ def nativeTypeSize(int size){
 }
 def getRegisterSizes(){
     def regs = registers.collect{nativeTypeSize(it.size)}
-    regs+=[32,32, 64] // append TRAP_STATE, PENDING_TRAP, ICOUNT
+    regs+=[32,32, 64, 64, 64] // append TRAP_STATE, PENDING_TRAP, ICOUNT, CYCLE, INSTRET
     return regs
 }
 def getRegisterOffsets(){
@@ -94,7 +94,9 @@ template <> struct traits<${coreDef.name.toLowerCase()}> {
         ${registers.collect{it.name}.join(', ')}, NUM_REGS,
         TRAP_STATE=NUM_REGS,
         PENDING_TRAP,
-        ICOUNT
+        ICOUNT,
+        CYCLE,
+        INSTRET
     };
 
     using reg_t = uint${addrDataWidth}_t;
@@ -175,6 +177,8 @@ protected:
         }}%>
         uint32_t trap_state = 0, pending_trap = 0;
         uint64_t icount = 0;
+        uint64_t cycle = 0;
+        uint64_t instret = 0;
         uint32_t last_branch;
     } reg;
 #pragma pack(pop)

gen_input/templates/interp/CORENAME.cpp.gtl

@@ -219,20 +219,22 @@ private:
     /* instruction ${idx}: ${instr.name} */
     compile_ret_t __${generator.functionName(instr.name)}(virt_addr_t& pc, code_word_t instr){
         // pre execution stuff
-        this->do_sync(PRE_SYNC, ${idx});
+        auto* PC = reinterpret_cast<uint${addrDataWidth}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::PC]);
+        auto NEXT_PC = reinterpret_cast<uint${addrDataWidth}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::NEXT_PC]);
+        *PC=*NEXT_PC;
+        auto* trap_state = reinterpret_cast<uint32_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::TRAP_STATE]);
+        *trap_state = *reinterpret_cast<uint32_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::PENDING_TRAP]);
+        if(this->sync_exec && PRE_SYNC) this->do_sync(PRE_SYNC, ${idx});
         <%instr.fields.eachLine{%>${it}
         <%}%>if(this->disass_enabled){
             /* generate console output when executing the command */
             <%instr.disass.eachLine{%>${it}
             <%}%>
         }
-        // prepare execution
-        uint${addrDataWidth}_t* PC = reinterpret_cast<uint${addrDataWidth}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::PC]);
-        uint${addrDataWidth}_t* NEXT_PC = reinterpret_cast<uint${addrDataWidth}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::NEXT_PC]);
         // used registers<%instr.usedVariables.each{ k,v->
             if(v.isArray) {%>
-        uint${v.type.size}_t* ${k} = reinterpret_cast<uint${v.type.size}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::${k}0]);<% }else{ %> 
+        auto* ${k} = reinterpret_cast<uint${v.type.size}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::${k}0]);<% }else{ %> 
-        uint${v.type.size}_t* ${k} = reinterpret_cast<uint${v.type.size}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::${k}]);
+        auto* ${k} = reinterpret_cast<uint${v.type.size}_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::${k}]);
         <%}}%>// calculate next pc value
         *NEXT_PC = *PC + ${instr.length/8};
         // execute instruction
@@ -241,11 +243,14 @@ private:
         <%}%>} catch(...){}
         // post execution stuff
         if(this->sync_exec && POST_SYNC) this->do_sync(POST_SYNC, ${idx});
-        auto* trap_state = reinterpret_cast<uint32_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::TRAP_STATE]);
         // trap check
         if(*trap_state!=0){
-            super::core.enter_trap(*trap_state, pc.val);
+            super::core.enter_trap(*trap_state, pc.val, instr);
+        } else {
+            (*reinterpret_cast<uint64_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::ICOUNT]))++;
+            (*reinterpret_cast<uint64_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::INSTRET]))++;
         }
+        (*reinterpret_cast<uint64_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::CYCLE]))++;
         pc.val=*NEXT_PC;
         return pc;
     }
@@ -264,7 +269,7 @@ private:
         auto* trap_state = reinterpret_cast<uint32_t*>(this->regs_base_ptr+arch::traits<ARCH>::reg_byte_offsets[arch::traits<ARCH>::TRAP_STATE]);
         // trap check
         if(*trap_state!=0){
-            super::core.enter_trap(*trap_state, pc.val);
+            super::core.enter_trap(*trap_state, pc.val, instr);
         }
         pc.val=*NEXT_PC;
         return pc;
@@ -318,7 +323,7 @@ typename vm_base<ARCH>::virt_addr_t vm_impl<ARCH>::execute_inst(finish_cond_e co
             !(is_count_limit_enabled(cond) && this->core.get_icount() >= icount_limit)){
         auto res = fetch_ins(pc, data);
         if(res!=iss::Ok){
-            auto new_pc = super::core.enter_trap(TRAP_ID, pc.val);
+            auto new_pc = super::core.enter_trap(TRAP_ID, pc.val, 0);
             res = fetch_ins(virt_addr_t{access_type::FETCH, new_pc}, data);
             if(res!=iss::Ok) throw simulation_stopped(0);
         }

incl/iss/arch/riscv_hart_m_p.h

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (C) 2021, MINRES Technologies GmbH
+ * Copyright (C) 2021 MINRES Technologies GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -176,8 +176,8 @@ public:
     iss::status write(const address_type type, const access_type access, const uint32_t space,
             const uint64_t addr, const unsigned length, const uint8_t *const data) override;
 
-    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_m_p::enter_trap(flags, fault_data); }
+    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_m_p::enter_trap(flags, fault_data, fault_data); }
-    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr) override;
+    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) override;
     virtual uint64_t leave_trap(uint64_t flags) override;
 
     const reg_t& get_mhartid() const { return mhartid_reg;	}
@@ -234,7 +234,10 @@ protected:
     virtual iss::status write_csr(unsigned addr, reg_t val);
 
     hart_state_type state;
-    uint64_t cycle_offset;
+    int64_t cycle_offset{0};
+    uint64_t mcycle_csr{0};
+    int64_t instret_offset{0};
+    uint64_t minstret_csr{0};
     reg_t fault_data;
     uint64_t tohost = tohost_dflt;
     uint64_t fromhost = fromhost_dflt;
@@ -255,7 +258,13 @@ protected:
 private:
     iss::status read_reg(unsigned addr, reg_t &val);
     iss::status write_reg(unsigned addr, reg_t val);
+    iss::status read_null(unsigned addr, reg_t &val);
+    iss::status write_null(unsigned addr, reg_t val){return iss::status::Ok;}
     iss::status read_cycle(unsigned addr, reg_t &val);
+    iss::status write_cycle(unsigned addr, reg_t val);
+    iss::status read_instret(unsigned addr, reg_t &val);
+    iss::status write_instret(unsigned addr, reg_t val);
+    iss::status read_mtvec(unsigned addr, reg_t &val);
     iss::status read_time(unsigned addr, reg_t &val);
     iss::status read_status(unsigned addr, reg_t &val);
     iss::status write_status(unsigned addr, reg_t val);
@@ -276,37 +285,59 @@ protected:
 template <typename BASE>
 riscv_hart_m_p<BASE>::riscv_hart_m_p()
 : state()
-, cycle_offset(0)
 , instr_if(*this) {
     csr[misa] = traits<BASE>::MISA_VAL;
     uart_buf.str("");
-    for (unsigned addr = mcycle; addr <= hpmcounter31; ++addr) csr_wr_cb[addr] = nullptr;
+    for (unsigned addr = mhpmcounter3; addr <= mhpmcounter31; ++addr){
-    for (unsigned addr = mcycleh; addr <= hpmcounter31h; ++addr) csr_wr_cb[addr] = nullptr;
+        csr_rd_cb[addr] = &this_class::read_null;
-    // special handling
+        csr_wr_cb[addr] = &this_class::write_reg;
-    csr_rd_cb[time] = &riscv_hart_m_p<BASE>::read_time;
-    csr_wr_cb[time] = nullptr;
-    csr_rd_cb[timeh] = &riscv_hart_m_p<BASE>::read_time;
-    csr_wr_cb[timeh] = nullptr;
-    csr_rd_cb[mcycle] = &riscv_hart_m_p<BASE>::read_cycle;
-    csr_rd_cb[mcycleh] = &riscv_hart_m_p<BASE>::read_cycle;
-    csr_rd_cb[minstret] = &riscv_hart_m_p<BASE>::read_cycle;
-    csr_rd_cb[minstreth] = &riscv_hart_m_p<BASE>::read_cycle;
-    csr_rd_cb[mstatus] = &riscv_hart_m_p<BASE>::read_status;
-    csr_wr_cb[mstatus] = &riscv_hart_m_p<BASE>::write_status;
-    csr_rd_cb[mip] = &riscv_hart_m_p<BASE>::read_ip;
-    csr_wr_cb[mip] = &riscv_hart_m_p<BASE>::write_ip;
-    csr_rd_cb[mie] = &riscv_hart_m_p<BASE>::read_ie;
-    csr_wr_cb[mie] = &riscv_hart_m_p<BASE>::write_ie;
-    csr_rd_cb[mhartid] = &riscv_hart_m_p<BASE>::read_hartid;
-    // common regs
-    const std::array<unsigned, 6> addrs{{mepc, mtvec, mscratch, mcause, mtval, mscratch}};
-    for(auto addr: addrs) {
-        csr_rd_cb[addr] = &riscv_hart_m_p<BASE>::read_reg;
-        csr_wr_cb[addr] = &riscv_hart_m_p<BASE>::write_reg;
     }
-    // read-only registers
+    for (unsigned addr = mhpmcounter3h; addr <= mhpmcounter31h; ++addr){
-    csr_rd_cb[misa] = &riscv_hart_m_p<BASE>::read_reg;
+        csr_rd_cb[addr] = &this_class::read_null;
-    csr_wr_cb[misa] = nullptr;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = mhpmevent3; addr <= mhpmevent31; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = cycle; addr <= hpmcounter31; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = cycleh; addr <= hpmcounter31h; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    // common regs
+    const std::array<unsigned, 7> addrs{{misa, mepc, mtvec, mscratch, mcause, mtval, mscratch}};
+    for(auto addr: addrs) {
+        csr_rd_cb[addr] = &this_class::read_reg;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    // special handling & overrides
+    csr_rd_cb[time] = &this_class::read_time;
+    csr_wr_cb[time] = nullptr;
+    csr_rd_cb[timeh] = &this_class::read_time;
+    csr_wr_cb[timeh] = nullptr;
+    csr_rd_cb[mcycle] = &this_class::read_cycle;
+    csr_wr_cb[mcycle] = &this_class::write_cycle;
+    csr_rd_cb[mcycleh] = &this_class::read_cycle;
+    csr_wr_cb[mcycleh] = &this_class::write_cycle;
+    csr_rd_cb[minstret] = &this_class::read_instret;
+    csr_wr_cb[minstret] = &this_class::write_instret;
+    csr_rd_cb[minstreth] = &this_class::read_instret;
+    csr_wr_cb[minstreth] = &this_class::write_instret;
+    csr_rd_cb[mstatus] = &this_class::read_status;
+    csr_wr_cb[mstatus] = &this_class::write_status;
+    csr_rd_cb[mip] = &this_class::read_ip;
+    csr_wr_cb[mip] = &this_class::write_ip;
+    csr_rd_cb[mie] = &this_class::read_ie;
+    csr_wr_cb[mie] = &this_class::write_ie;
+    csr_rd_cb[mhartid] = &this_class::read_hartid;
+    csr_rd_cb[mcounteren] = &this_class::read_null;
+    csr_wr_cb[mcounteren] = &this_class::write_null;
+    csr_rd_cb[mtvec] = &this_class::read_mtvec;
+    csr_wr_cb[misa] = &this_class::write_null;
 }
 
 template <typename BASE> std::pair<uint64_t, bool> riscv_hart_m_p<BASE>::load_file(std::string name, int type) {
@@ -547,6 +578,11 @@ template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_reg(unsigned add
     return iss::Ok;
 }
 
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_null(unsigned addr, reg_t &val) {
+    val = 0;
+    return iss::Ok;
+}
+
 template <typename BASE> iss::status riscv_hart_m_p<BASE>::write_reg(unsigned addr, reg_t val) {
     csr[addr] = val;
     return iss::Ok;
@@ -563,8 +599,50 @@ template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_cycle(unsigned a
     return iss::Ok;
 }
 
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::write_cycle(unsigned addr, reg_t val) {
+    if (sizeof(typename traits<BASE>::reg_t) != 4) {
+        if (addr == mcycleh)
+            return iss::Err;
+        mcycle_csr = static_cast<uint64_t>(val);
+    } else {
+        if (addr == mcycle) {
+            mcycle_csr = (mcycle_csr & 0xffffffff00000000) + val;
+        } else  {
+            mcycle_csr = (static_cast<uint64_t>(val)<<32) + (mcycle_csr & 0xffffffff);
+        }
+    }
+    cycle_offset = mcycle_csr-this->reg.icount; // TODO: relying on wrap-around
+    return iss::Ok;
+}
+
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_instret(unsigned addr, reg_t &val) {
+    if (addr == minstret) {
+        val = static_cast<reg_t>(this->reg.instret);
+    } else if (addr == minstreth) {
+        if (sizeof(typename traits<BASE>::reg_t) != 4) return iss::Err;
+        val = static_cast<reg_t>(this->reg.instret >> 32);
+    }
+    return iss::Ok;
+}
+
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::write_instret(unsigned addr, reg_t val) {
+    if (sizeof(typename traits<BASE>::reg_t) != 4) {
+        if (addr == minstreth)
+            return iss::Err;
+        this->reg.instret = static_cast<uint64_t>(val);
+    } else {
+        if (addr == minstret) {
+            this->reg.instret = (this->reg.instret & 0xffffffff00000000) + val;
+        } else  {
+            this->reg.instret = (static_cast<uint64_t>(val)<<32) + (this->reg.instret & 0xffffffff);
+        }
+    }
+    this->reg.instret--;
+    return iss::Ok;
+}
+
 template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_time(unsigned addr, reg_t &val) {
-    uint64_t time_val = (this->reg.icount + cycle_offset) / (100000000 / 32768 - 1); //-> ~3052;
+    uint64_t time_val = this->reg.icount / (100000000 / 32768 - 1); //-> ~3052;
     if (addr == time) {
         val = static_cast<reg_t>(time_val);
     } else if (addr == timeh) {
@@ -574,6 +652,11 @@ template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_time(unsigned ad
     return iss::Ok;
 }
 
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_mtvec(unsigned addr, reg_t &val) {
+    val = csr[mtvec] & ~2;
+    return iss::Ok;
+}
+
 template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_status(unsigned addr, reg_t &val) {
     val = state.mstatus & hart_state_type::get_mask();
     return iss::Ok;
@@ -619,7 +702,6 @@ template <typename BASE> iss::status riscv_hart_m_p<BASE>::write_ip(unsigned add
 
 template <typename BASE>
 iss::status riscv_hart_m_p<BASE>::read_mem(phys_addr_t paddr, unsigned length, uint8_t *const data) {
-    if ((paddr.val + length) > mem.size()) return iss::Err;
     if(mem_read_cb) return mem_read_cb(paddr, length, data);
     switch (paddr.val) {
     case 0x0200BFF8: { // CLINT base, mtime reg
@@ -635,9 +717,9 @@ iss::status riscv_hart_m_p<BASE>::read_mem(phys_addr_t paddr, unsigned length, u
         if (this->reg.icount > 30000) data[3] |= 0x80;
     } break;
     default: {
-        const auto &p = mem(paddr.val / mem.page_size);
+        for(auto offs=0U; offs<length; ++offs) {
-        auto offs = paddr.val & mem.page_addr_mask;
+            *(data + offs)=mem[(paddr.val+offs)%mem.size()];
-        std::copy(p.data() + offs, p.data() + offs + length, data);
+        }
     }
     }
     return iss::Ok;
@@ -747,7 +829,7 @@ template <typename BASE> void riscv_hart_m_p<BASE>::check_interrupt() {
     }
 }
 
-template <typename BASE> uint64_t riscv_hart_m_p<BASE>::enter_trap(uint64_t flags, uint64_t addr) {
+template <typename BASE> uint64_t riscv_hart_m_p<BASE>::enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) {
     // flags are ACTIVE[31:31], CAUSE[30:16], TRAPID[15:0]
     // calculate and write mcause val
     auto trap_id = bit_sub<0, 16>(flags);
@@ -757,7 +839,7 @@ template <typename BASE> uint64_t riscv_hart_m_p<BASE>::enter_trap(uint64_t flag
     if (trap_id == 0) { // exception
         // store ret addr in xepc register
         csr[mepc] = static_cast<reg_t>(addr); // store actual address instruction of exception
-        csr[mtval] = fault_data;
+        csr[mtval] = cause==2?instr:fault_data;
         fault_data = 0;
     } else {
         csr[mepc] = this->reg.NEXT_PC; // store next address if interrupt
@@ -779,7 +861,7 @@ template <typename BASE> uint64_t riscv_hart_m_p<BASE>::enter_trap(uint64_t flag
     auto ivec = csr[mtvec];
     // calculate addr// set NEXT_PC to trap addressess to jump to based on MODE
     // bits in mtvec
-    this->reg.NEXT_PC = ivec & ~0x1UL;
+    this->reg.NEXT_PC = ivec & ~0x3UL;
     if ((ivec & 0x1) == 1 && trap_id != 0) this->reg.NEXT_PC += 4 * cause;
     // reset trap state
     this->reg.PRIV = PRIV_M;

incl/iss/arch/riscv_hart_msu_vp.h

@@ -43,13 +43,14 @@
 #ifndef FMT_HEADER_ONLY
 #define FMT_HEADER_ONLY
 #endif
-#include <fmt/format.h>
 #include <array>
 #include <elfio/elfio.hpp>
+#include <fmt/format.h>
 #include <iomanip>
 #include <sstream>
 #include <type_traits>
 #include <unordered_map>
+#include <functional>
 #include <util/bit_field.h>
 #include <util/ities.h>
 #include <util/sparse_array.h>
@@ -299,18 +300,30 @@ public:
     iss::status write(const address_type type, const access_type access, const uint32_t space,
             const uint64_t addr, const unsigned length, const uint8_t *const data) override;
 
-    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_msu_vp::enter_trap(flags, fault_data); }
+    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_msu_vp::enter_trap(flags, fault_data, fault_data); }
-    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr) override;
+    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) override;
     virtual uint64_t leave_trap(uint64_t flags) override;
     void wait_until(uint64_t flags) override;
 
     void disass_output(uint64_t pc, const std::string instr) override {
         CLOG(INFO, disass) << fmt::format("0x{:016x}    {:40} [p:{};s:0x{:x};c:{}]",
-                pc, instr, lvl[this->reg.PRIV], (reg_t)state.mstatus, this->reg.icount);
+                pc, instr, lvl[this->reg.PRIV], (reg_t)state.mstatus, this->reg.ccount);
     };
 
     iss::instrumentation_if *get_instrumentation_if() override { return &instr_if; }
- 
+
+    void setMemReadCb(std::function<iss::status(phys_addr_t, unsigned, uint8_t* const)> const& memReadCb) {
+        mem_read_cb = memReadCb;
+    }
+
+    void setMemWriteCb(std::function<iss::status(phys_addr_t, unsigned, const uint8_t* const)> const& memWriteCb) {
+        mem_write_cb = memWriteCb;
+    }
+
+    void set_csr(unsigned addr, reg_t val){
+        csr[addr & csr.page_addr_mask] = val;
+    }
+
 protected:
     struct riscv_instrumentation_if : public iss::instrumentation_if {
 
@@ -364,6 +377,9 @@ protected:
     std::unordered_map<unsigned, wr_csr_f> csr_wr_cb;
 
 private:
+    iss::status read_null(unsigned addr, reg_t &val);
+    iss::status read_reg(unsigned addr, reg_t &val);
+    iss::status write_reg(unsigned addr, reg_t val);
     iss::status read_cycle(unsigned addr, reg_t &val);
     iss::status read_time(unsigned addr, reg_t &val);
     iss::status read_status(unsigned addr, reg_t &val);
@@ -372,11 +388,16 @@ private:
     iss::status write_ie(unsigned addr, reg_t val);
     iss::status read_ip(unsigned addr, reg_t &val);
     iss::status write_ip(unsigned addr, reg_t val);
+    iss::status read_hartid(unsigned addr, reg_t &val);
     iss::status read_satp(unsigned addr, reg_t &val);
     iss::status write_satp(unsigned addr, reg_t val);
     iss::status read_fcsr(unsigned addr, reg_t &val);
     iss::status write_fcsr(unsigned addr, reg_t val);
 
+    reg_t mhartid_reg{0x0};
+    std::function<iss::status(phys_addr_t, unsigned, uint8_t *const)>mem_read_cb;
+    std::function<iss::status(phys_addr_t, unsigned, const uint8_t *const)> mem_write_cb;
+
 protected:
     void check_interrupt();
 };
@@ -388,10 +409,26 @@ riscv_hart_msu_vp<BASE>::riscv_hart_msu_vp()
 , instr_if(*this) {
     csr[misa] = hart_state_type::get_misa();
     uart_buf.str("");
-    // read-only registers
+    for (unsigned addr = mcycle; addr <= mhpmcounter31; ++addr){
-    csr_wr_cb[misa] = nullptr;
+        csr_rd_cb[addr] = &this_class::read_null;
-    for (unsigned addr = mcycle; addr <= hpmcounter31; ++addr) csr_wr_cb[addr] = nullptr;
+        csr_wr_cb[addr] = &this_class::write_reg;
-    for (unsigned addr = mcycleh; addr <= hpmcounter31h; ++addr) csr_wr_cb[addr] = nullptr;
+    }
+    for (unsigned addr = mcycleh; addr <= mhpmcounter31h; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = mhpmevent3; addr <= mhpmevent31; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = cycle; addr <= hpmcounter31; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    for (unsigned addr = cycleh; addr <= hpmcounter31h; ++addr){
+        csr_rd_cb[addr] = &this_class::read_null;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
     // special handling
     csr_rd_cb[time] = &this_class::read_time;
     csr_wr_cb[time] = nullptr;
@@ -419,6 +456,17 @@ riscv_hart_msu_vp<BASE>::riscv_hart_msu_vp()
     csr_wr_cb[sie] = &this_class::write_ie;
     csr_rd_cb[uie] = &this_class::read_ie;
     csr_wr_cb[uie] = &this_class::write_ie;
+    csr_rd_cb[mhartid] = &this_class::read_hartid;
+    // common regs
+    const std::array<unsigned, 6> addrs{{mepc, mtvec, mscratch, mcause, mtval, mscratch}};
+    for(auto addr: addrs) {
+        csr_rd_cb[addr] = &this_class::read_reg;
+        csr_wr_cb[addr] = &this_class::write_reg;
+    }
+    // read-only registers
+    csr_rd_cb[misa] = &this_class::read_reg;
+    csr_wr_cb[misa] = nullptr;
+    
     csr_rd_cb[satp] = &this_class::read_satp;
     csr_wr_cb[satp] = &this_class::write_satp;
     csr_rd_cb[fcsr] = &this_class::read_fcsr;
@@ -679,35 +727,43 @@ iss::status riscv_hart_msu_vp<BASE>::write(const address_type type, const access
 template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_csr(unsigned addr, reg_t &val) {
     if (addr >= csr.size()) return iss::Err;
     auto req_priv_lvl = (addr >> 8) & 0x3;
-    if (this->reg.PRIV < req_priv_lvl) throw illegal_instruction_fault(this->fault_data);
+    if (this->reg.PRIV < req_priv_lvl) // not having required privileges
+    	throw illegal_instruction_fault(this->fault_data);
     auto it = csr_rd_cb.find(addr);
-    if (it == csr_rd_cb.end()) {
+    if (it == csr_rd_cb.end() || !it->second) // non existent register
-        val = csr[addr & csr.page_addr_mask];
+        throw illegal_instruction_fault(this->fault_data);
-        return iss::Ok;
+    return (this->*(it->second))(addr, val);
-    }
-    rd_csr_f f = it->second;
-    if (f == nullptr) throw illegal_instruction_fault(this->fault_data);
-    return (this->*f)(addr, val);
 }
 
 template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::write_csr(unsigned addr, reg_t val) {
     if (addr >= csr.size()) return iss::Err;
     auto req_priv_lvl = (addr >> 8) & 0x3;
-    if (this->reg.PRIV < req_priv_lvl)
+    if (this->reg.PRIV < req_priv_lvl) // not having required privileges
         throw illegal_instruction_fault(this->fault_data);
-    if((addr&0xc00)==0xc00)
+    if((addr&0xc00)==0xc00) // writing to read-only region
         throw illegal_instruction_fault(this->fault_data);
     auto it = csr_wr_cb.find(addr);
-    if (it == csr_wr_cb.end()) {
+    if (it == csr_wr_cb.end() || !it->second) // non existent register
-        csr[addr & csr.page_addr_mask] = val;
+        throw illegal_instruction_fault(this->fault_data);
-        return iss::Ok;
+    return (this->*(it->second))(addr, val);
-    }
-    wr_csr_f f = it->second;
-    if (f == nullptr) throw illegal_instruction_fault(this->fault_data);
-    return (this->*f)(addr, val);
 }
 
-template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_cycle(unsigned addr, reg_t &val) {
+template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_reg(unsigned addr, reg_t &val) {
+    val = csr[addr];
+    return iss::Ok;
+}
+
+template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_null(unsigned addr, reg_t &val) {
+    val = 0;
+    return iss::Ok;
+}
+
+template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::write_reg(unsigned addr, reg_t val) {
+    csr[addr] = val;
+    return iss::Ok;
+}
+
+template <typename BASE> iss::status riscv_hart_m_p<BASE>::read_cycle(unsigned addr, reg_t &val) {
     auto cycle_val = this->reg.icount + cycle_offset;
     if (addr == mcycle) {
         val = static_cast<reg_t>(cycle_val);
@@ -750,6 +806,11 @@ template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_ie(unsigned a
     return iss::Ok;
 }
 
+template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::read_hartid(unsigned addr, reg_t &val) {
+    val = mhartid_reg;
+    return iss::Ok;
+}
+
 template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::write_ie(unsigned addr, reg_t val) {
     auto req_priv_lvl = (addr >> 8) & 0x3;
     auto mask = get_irq_mask(req_priv_lvl);
@@ -832,7 +893,7 @@ template <typename BASE> iss::status riscv_hart_msu_vp<BASE>::write_fcsr(unsigne
 
 template <typename BASE>
 iss::status riscv_hart_msu_vp<BASE>::read_mem(phys_addr_t paddr, unsigned length, uint8_t *const data) {
-    if ((paddr.val + length) > mem.size()) return iss::Err;
+    if(mem_read_cb) return mem_read_cb(paddr, length, data);
     switch (paddr.val) {
     case 0x0200BFF8: { // CLINT base, mtime reg
         if (sizeof(reg_t) < length) return iss::Err;
@@ -847,9 +908,9 @@ iss::status riscv_hart_msu_vp<BASE>::read_mem(phys_addr_t paddr, unsigned length
         if (this->reg.icount > 30000) data[3] |= 0x80;
     } break;
     default: {
-        const auto &p = mem(paddr.val / mem.page_size);
+        for(auto offs=0U; offs<length; ++offs) {
-        auto offs = paddr.val & mem.page_addr_mask;
+            *(data + offs)=mem[(paddr.val+offs)%mem.size()];
-        std::copy(p.data() + offs, p.data() + offs + length, data);
+    	}
     }
     }
     return iss::Ok;
@@ -858,6 +919,7 @@ iss::status riscv_hart_msu_vp<BASE>::read_mem(phys_addr_t paddr, unsigned length
 template <typename BASE>
 iss::status riscv_hart_msu_vp<BASE>::write_mem(phys_addr_t paddr, unsigned length, const uint8_t *const data) {
     if ((paddr.val + length) > mem.size()) return iss::Err;
+    if(mem_write_cb) return mem_write_cb(paddr, length, data);
     switch (paddr.val) {
     case 0x10013000: // UART0 base, TXFIFO reg
     case 0x10023000: // UART1 base, TXFIFO reg
@@ -1070,7 +1132,7 @@ typename riscv_hart_msu_vp<BASE>::phys_addr_t riscv_hart_msu_vp<BASE>::virt2phys
     }
 }
 
-template <typename BASE> uint64_t riscv_hart_msu_vp<BASE>::enter_trap(uint64_t flags, uint64_t addr) {
+template <typename BASE> uint64_t riscv_hart_msu_vp<BASE>::enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) {
     auto cur_priv = this->reg.PRIV;
     // flags are ACTIVE[31:31], CAUSE[30:16], TRAPID[15:0]
     // calculate and write mcause val
@@ -1091,7 +1153,7 @@ template <typename BASE> uint64_t riscv_hart_msu_vp<BASE>::enter_trap(uint64_t f
          * access, or page-fault exception occurs, mtval is written with the
          * faulting effective address.
          */
-        csr[utval | (new_priv << 8)] = fault_data;
+        csr[utval | (new_priv << 8)] = cause==2?instr : fault_data;
         fault_data = 0;
     } else {
         if (cur_priv != PRIV_M && ((csr[mideleg] >> cause) & 0x1) != 0)

incl/iss/arch/riscv_hart_mu_p.h

@@ -191,8 +191,8 @@ public:
     iss::status write(const address_type type, const access_type access, const uint32_t space,
             const uint64_t addr, const unsigned length, const uint8_t *const data) override;
 
-    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_mu_p::enter_trap(flags, fault_data); }
+    virtual uint64_t enter_trap(uint64_t flags) override { return riscv_hart_mu_p::enter_trap(flags, fault_data, fault_data); }
-    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr) override;
+    virtual uint64_t enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) override;
     virtual uint64_t leave_trap(uint64_t flags) override;
 
     const reg_t& get_mhartid() const { return mhartid_reg;	}
@@ -200,7 +200,7 @@ public:
 
     void disass_output(uint64_t pc, const std::string instr) override {
         CLOG(INFO, disass) << fmt::format("0x{:016x}    {:40} [p:{};s:0x{:x};c:{}]",
-                pc, instr, lvl[this->reg.PRIV], (reg_t)state.mstatus, this->reg.icount);
+                pc, instr, lvl[this->reg.PRIV], (reg_t)state.mstatus, this->reg.ccount);
     };
 
     iss::instrumentation_if *get_instrumentation_if() override { return &instr_if; }
@@ -789,7 +789,7 @@ template <typename BASE, features_e FEAT> void riscv_hart_mu_p<BASE, FEAT>::chec
     }
 }
 
-template <typename BASE, features_e FEAT> uint64_t riscv_hart_mu_p<BASE, FEAT>::enter_trap(uint64_t flags, uint64_t addr) {
+template <typename BASE, features_e FEAT> uint64_t riscv_hart_mu_p<BASE, FEAT>::enter_trap(uint64_t flags, uint64_t addr, uint64_t instr) {
     // flags are ACTIVE[31:31], CAUSE[30:16], TRAPID[15:0]
     // calculate and write mcause val
     auto trap_id = bit_sub<0, 16>(flags);
@@ -809,7 +809,7 @@ template <typename BASE, features_e FEAT> uint64_t riscv_hart_mu_p<BASE, FEAT>::
          * access, or page-fault exception occurs, mtval is written with the
          * faulting effective address.
          */
-        csr[utval | (new_priv << 8)] = fault_data;
+        csr[utval | (new_priv << 8)] = cause==2?instr:fault_data;
         fault_data = 0;
     } else {
         if (this->reg.PRIV != PRIV_M && ((csr[mideleg] >> cause) & 0x1) != 0)

incl/iss/arch/tgc_c.h

@@ -61,7 +61,9 @@ template <> struct traits<tgc_c> {
         X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X21, X22, X23, X24, X25, X26, X27, X28, X29, X30, X31, PC, NEXT_PC, PRIV, NUM_REGS,
         TRAP_STATE=NUM_REGS,
         PENDING_TRAP,
-        ICOUNT
+        ICOUNT,
+        CYCLE,
+        INSTRET
     };
 
     using reg_t = uint32_t;
@@ -74,11 +76,11 @@ template <> struct traits<tgc_c> {
 
     using phys_addr_t = iss::typed_addr_t<iss::address_type::PHYSICAL>;
 
-    static constexpr std::array<const uint32_t, 38> reg_bit_widths{
+    static constexpr std::array<const uint32_t, 40> reg_bit_widths{
-        {32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,8,32,32,64}};
+        {32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,8,32,32,64,64,64}};
 
-    static constexpr std::array<const uint32_t, 38> reg_byte_offsets{
+    static constexpr std::array<const uint32_t, 40> reg_byte_offsets{
-        {0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108,112,116,120,124,128,132,136,137,141,145}};
+        {0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108,112,116,120,124,128,132,136,137,141,145,153,161}};
 
     static const uint64_t addr_mask = (reg_t(1) << (XLEN - 1)) | ((reg_t(1) << (XLEN - 1)) - 1);
 
@@ -154,25 +156,27 @@ template <> struct traits<tgc_c> {
         CLI = 64,
         CLUI = 65,
         CADDI16SP = 66,
-        CSRLI = 67,
+        __reserved_clui = 67,
-        CSRAI = 68,
+        CSRLI = 68,
-        CANDI = 69,
+        CSRAI = 69,
-        CSUB = 70,
+        CANDI = 70,
-        CXOR = 71,
+        CSUB = 71,
-        COR = 72,
+        CXOR = 72,
-        CAND = 73,
+        COR = 73,
-        CJ = 74,
+        CAND = 74,
-        CBEQZ = 75,
+        CJ = 75,
-        CBNEZ = 76,
+        CBEQZ = 76,
-        CSLLI = 77,
+        CBNEZ = 77,
-        CLWSP = 78,
+        CSLLI = 78,
-        CMV = 79,
+        CLWSP = 79,
-        CJR = 80,
+        CMV = 80,
-        CADD = 81,
+        CJR = 81,
-        CJALR = 82,
+        __reserved_cmv = 82,
-        CEBREAK = 83,
+        CADD = 83,
-        CSWSP = 84,
+        CJALR = 84,
-        DII = 85,
+        CEBREAK = 85,
+        CSWSP = 86,
+        DII = 87,
         MAX_OPCODE
     };
 };
@@ -259,6 +263,8 @@ protected:
         uint8_t PRIV = 0;
         uint32_t trap_state = 0, pending_trap = 0;
         uint64_t icount = 0;
+        uint64_t cycle = 0;
+        uint64_t instret = 0;
         uint32_t last_branch;
     } reg;
 #pragma pack(pop)

src/iss/tgc_c.cpp

@@ -41,8 +41,8 @@ using namespace iss::arch;
 
 constexpr std::array<const char*, 35>    iss::arch::traits<iss::arch::tgc_c>::reg_names;
 constexpr std::array<const char*, 35>    iss::arch::traits<iss::arch::tgc_c>::reg_aliases;
-constexpr std::array<const uint32_t, 38> iss::arch::traits<iss::arch::tgc_c>::reg_bit_widths;
+constexpr std::array<const uint32_t, 40> iss::arch::traits<iss::arch::tgc_c>::reg_bit_widths;
-constexpr std::array<const uint32_t, 38> iss::arch::traits<iss::arch::tgc_c>::reg_byte_offsets;
+constexpr std::array<const uint32_t, 40> iss::arch::traits<iss::arch::tgc_c>::reg_byte_offsets;
 
 tgc_c::tgc_c() {
     reg.icount = 0;