| // -*- mode:c++ -*- |
| |
| // Copyright (c) 2015 RISC-V Foundation |
| // Copyright (c) 2016-2017 The University of Virginia |
| // Copyright (c) 2020 Barkhausen Institut |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer; |
| // redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution; |
| // neither the name of the copyright holders nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| //////////////////////////////////////////////////////////////////// |
| // |
| // Integer instructions |
| // |
| |
| def template ImmDeclare {{ |
| // |
| // Static instruction class for "%(mnemonic)s". |
| // |
| class %(class_name)s : public %(base_class)s |
| { |
| private: |
| %(reg_idx_arr_decl)s; |
| |
| public: |
| /// Constructor. |
| %(class_name)s(MachInst machInst); |
| Fault execute(ExecContext *, Trace::InstRecord *) const override; |
| std::string generateDisassembly(Addr pc, |
| const loader::SymbolTable *symtab) const override; |
| }; |
| }}; |
| |
| def template ImmConstructor {{ |
| %(class_name)s::%(class_name)s(MachInst machInst) |
| : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s) |
| { |
| %(set_reg_idx_arr)s; |
| %(constructor)s; |
| %(imm_code)s; |
| } |
| }}; |
| |
| def template ImmExecute {{ |
| Fault |
| %(class_name)s::execute( |
| ExecContext *xc, Trace::InstRecord *traceData) const |
| { |
| %(op_decl)s; |
| %(op_rd)s; |
| %(code)s; |
| %(op_wb)s; |
| return NoFault; |
| } |
| |
| std::string |
| %(class_name)s::generateDisassembly(Addr pc, |
| const loader::SymbolTable *symtab) const |
| { |
| std::vector<RegId> indices = {%(regs)s}; |
| std::stringstream ss; |
| ss << mnemonic << ' '; |
| for (const RegId& idx: indices) |
| ss << registerName(idx) << ", "; |
| ss << imm; |
| return ss.str(); |
| } |
| }}; |
| |
| def template CILuiExecute {{ |
| Fault |
| %(class_name)s::execute( |
| ExecContext *xc, Trace::InstRecord *traceData) const |
| { |
| %(op_decl)s; |
| %(op_rd)s; |
| %(code)s; |
| %(op_wb)s; |
| return NoFault; |
| } |
| |
| std::string |
| %(class_name)s::generateDisassembly(Addr pc, |
| const loader::SymbolTable *symtab) const |
| { |
| std::vector<RegId> indices = {%(regs)s}; |
| std::stringstream ss; |
| ss << mnemonic << ' '; |
| for (const RegId& idx: indices) |
| ss << registerName(idx) << ", "; |
| // To be compliant with GCC, the immediate is formated to a 20-bit |
| // signed integer. |
| ss << ((((uint64_t)imm) >> 12) & 0xFFFFF); |
| return ss.str(); |
| } |
| }}; |
| |
| def template FenceExecute {{ |
| Fault |
| %(class_name)s::execute( |
| ExecContext *xc, Trace::InstRecord *traceData) const |
| { |
| %(op_decl)s; |
| %(op_rd)s; |
| %(code)s; |
| %(op_wb)s; |
| return NoFault; |
| } |
| |
| std::string |
| %(class_name)s::generateDisassembly(Addr pc, |
| const loader::SymbolTable *symtab) const |
| { |
| std::stringstream ss; |
| ss << mnemonic; |
| if (!FUNCT3) { |
| ss << ' '; |
| if (PRED & 0x8) |
| ss << 'i'; |
| if (PRED & 0x4) |
| ss << 'o'; |
| if (PRED & 0x2) |
| ss << 'r'; |
| if (PRED & 0x1) |
| ss << 'w'; |
| ss << ", "; |
| if (SUCC & 0x8) |
| ss << 'i'; |
| if (SUCC & 0x4) |
| ss << 'o'; |
| if (SUCC & 0x2) |
| ss << 'r'; |
| if (SUCC & 0x1) |
| ss << 'w'; |
| } |
| return ss.str(); |
| } |
| }}; |
| |
| def template BranchDeclare {{ |
| // |
| // Static instruction class for "%(mnemonic)s". |
| // |
| class %(class_name)s : public %(base_class)s |
| { |
| private: |
| %(reg_idx_arr_decl)s; |
| |
| public: |
| /// Constructor. |
| %(class_name)s(MachInst machInst); |
| Fault execute(ExecContext *, Trace::InstRecord *) const override; |
| |
| std::string |
| generateDisassembly( |
| Addr pc, const loader::SymbolTable *symtab) const override; |
| |
| std::unique_ptr<PCStateBase> branchTarget( |
| const PCStateBase &branch_pc) const override; |
| |
| using StaticInst::branchTarget; |
| }; |
| }}; |
| |
| def template BranchExecute {{ |
| Fault |
| %(class_name)s::execute(ExecContext *xc, |
| Trace::InstRecord *traceData) const |
| { |
| %(op_decl)s; |
| %(op_rd)s; |
| %(code)s; |
| %(op_wb)s; |
| return NoFault; |
| } |
| |
| std::unique_ptr<PCStateBase> |
| %(class_name)s::branchTarget(const PCStateBase &branch_pc) const |
| { |
| auto &rpc = branch_pc.as<RiscvISA::PCState>(); |
| return std::make_unique<PCState>(rpc.pc() + imm); |
| } |
| |
| std::string |
| %(class_name)s::generateDisassembly( |
| Addr pc, const loader::SymbolTable *symtab) const |
| { |
| std::vector<RegId> indices = {%(regs)s}; |
| std::stringstream ss; |
| ss << mnemonic << ' '; |
| for (const RegId& idx: indices) |
| ss << registerName(idx) << ", "; |
| ss << imm; |
| return ss.str(); |
| } |
| }}; |
| |
| def template JumpDeclare {{ |
| // |
| // Static instruction class for "%(mnemonic)s". |
| // |
| class %(class_name)s : public %(base_class)s |
| { |
| private: |
| %(reg_idx_arr_decl)s; |
| |
| public: |
| /// Constructor. |
| %(class_name)s(MachInst machInst); |
| Fault execute(ExecContext *, Trace::InstRecord *) const override; |
| |
| std::string |
| generateDisassembly( |
| Addr pc, const loader::SymbolTable *symtab) const override; |
| |
| std::unique_ptr<PCStateBase> branchTarget( |
| ThreadContext *tc) const override; |
| |
| using StaticInst::branchTarget; |
| }; |
| }}; |
| |
| def template JumpConstructor {{ |
| %(class_name)s::%(class_name)s(MachInst machInst) |
| : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s) |
| { |
| %(set_reg_idx_arr)s; |
| %(constructor)s; |
| %(imm_code)s; |
| if (QUADRANT != 0x3) { |
| // Handle "c_jr" instruction, set "IsReturn" flag if RC1 is 1 or 5 |
| if (CFUNCT1 == 0 && (RC1 == 1 || RC1 == 5)) |
| flags[IsReturn] = true; |
| } else { |
| bool rd_link = (RD == 1 || RD == 5); |
| bool rs1_link = (RS1 == 1 || RS1 == 5); |
| // Handle "jalr" and "jal" instruction, |
| // set "IsCall" if RD is link register |
| if (rd_link) |
| flags[IsCall] = true; |
| |
| // Handle "Jalr" instruction |
| if (FUNCT3 == 0x0) { |
| // If RD is not link and RS1 is link, then pop RAS |
| if (!rd_link && rs1_link) flags[IsReturn] = true; |
| else if (rd_link) { |
| // If RD is link and RS1 is not link, push RAS |
| if (!rs1_link) flags[IsCall] = true; |
| // If RD is link and RS1 is link and rd != rs1 |
| else if (rs1_link) { |
| if (RS1 != RD) { |
| // Both are link and RS1 == RD, pop then push |
| flags[IsReturn] = true; |
| flags[IsCall] = true; |
| } else { |
| // Both are link and RS1 != RD, push RAS |
| flags[IsCall] = true; |
| } |
| } |
| } |
| } |
| } |
| } |
| }}; |
| |
| def template JumpExecute {{ |
| Fault |
| %(class_name)s::execute( |
| ExecContext *xc, Trace::InstRecord *traceData) const |
| { |
| %(op_decl)s; |
| %(op_rd)s; |
| %(code)s; |
| %(op_wb)s; |
| return NoFault; |
| } |
| |
| std::unique_ptr<PCStateBase> |
| %(class_name)s::branchTarget(ThreadContext *tc) const |
| { |
| PCStateBase *pc_ptr = tc->pcState().clone(); |
| pc_ptr->as<PCState>().set( |
| (tc->readIntReg(srcRegIdx(0).index()) + imm) & ~0x1); |
| return std::unique_ptr<PCStateBase>{pc_ptr}; |
| } |
| |
| std::string |
| %(class_name)s::generateDisassembly( |
| Addr pc, const loader::SymbolTable *symtab) const |
| { |
| std::stringstream ss; |
| ss << mnemonic << ' '; |
| if (QUADRANT == 0x3) |
| ss << registerName(destRegIdx(0)) << ", " |
| << imm << "(" << registerName(srcRegIdx(0)) << ")"; |
| else |
| ss << registerName(srcRegIdx(0)); |
| return ss.str(); |
| } |
| }}; |
| |
| def template CSRExecute {{ |
| Fault |
| %(class_name)s::execute(ExecContext *xc, |
| Trace::InstRecord *traceData) const |
| { |
| if (!valid) { |
| return std::make_shared<IllegalInstFault>( |
| csprintf("Illegal CSR index %#x\n", csr), machInst); |
| } |
| |
| %(op_decl)s; |
| %(op_rd)s; |
| |
| RegVal data, olddata; |
| auto lowestAllowedMode = (PrivilegeMode)bits(csr, 9, 8); |
| auto pm = (PrivilegeMode)xc->readMiscReg(MISCREG_PRV); |
| if (pm < lowestAllowedMode) { |
| return std::make_shared<IllegalInstFault>( |
| csprintf("%s is not accessible in %s\n", csrName, pm), |
| machInst); |
| } |
| switch (csr) { |
| case CSR_SATP: { |
| STATUS status = xc->readMiscReg(MISCREG_STATUS); |
| if (pm == PRV_S && status.tvm == 1) { |
| return std::make_shared<IllegalInstFault>( |
| "SATP access with TVM enabled\n", |
| machInst); |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| |
| if (csr == CSR_FCSR) { |
| olddata = xc->readMiscReg(MISCREG_FFLAGS) | |
| (xc->readMiscReg(MISCREG_FRM) << FRM_OFFSET); |
| } else { |
| olddata = xc->readMiscReg(midx); |
| } |
| auto olddata_all = olddata; |
| |
| olddata &= maskVal; |
| DPRINTF(RiscvMisc, "Reading CSR %s: %#x\n", csrName, olddata); |
| data = olddata; |
| |
| %(code)s; |
| |
| data &= maskVal; |
| if (data != olddata) { |
| if (bits(csr, 11, 10) == 0x3) { |
| return std::make_shared<IllegalInstFault>( |
| csprintf("CSR %s is read-only\n", csrName), machInst); |
| } |
| auto newdata_all = data; |
| // We must keep those original bits not in mask. |
| // olddata and data only contain the bits visable |
| // in current privilige level. |
| newdata_all = (olddata_all & ~maskVal) | data; |
| DPRINTF(RiscvMisc, "Writing %#x to CSR %s.\n", |
| newdata_all, csrName); |
| switch (csr) { |
| case CSR_FCSR: |
| xc->setMiscReg(MISCREG_FFLAGS, bits(data, 4, 0)); |
| xc->setMiscReg(MISCREG_FRM, bits(data, 7, 5)); |
| break; |
| case CSR_MIP: case CSR_MIE: |
| case CSR_SIP: case CSR_SIE: |
| case CSR_UIP: case CSR_UIE: |
| case CSR_MSTATUS: case CSR_SSTATUS: case CSR_USTATUS: |
| if (newdata_all != olddata_all) { |
| xc->setMiscReg(midx, newdata_all); |
| } else { |
| return std::make_shared<IllegalInstFault>( |
| "Only bits in mask are allowed to be set\n", |
| machInst); |
| } |
| break; |
| default: |
| xc->setMiscReg(midx, data); |
| break; |
| } |
| } |
| %(op_wb)s; |
| return NoFault; |
| } |
| }}; |
| |
| def format ROp(code, *opt_flags) {{ |
| iop = InstObjParams(name, Name, 'RegOp', code, opt_flags) |
| header_output = BasicDeclare.subst(iop) |
| decoder_output = BasicConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = BasicExecute.subst(iop) |
| }}; |
| |
| def format IOp(code, imm_type='int64_t', imm_code='imm = sext<12>(IMM12);', |
| *opt_flags) {{ |
| regs = ['destRegIdx(0)','srcRegIdx(0)'] |
| iop = InstObjParams(name, Name, 'ImmOp<%s>' % imm_type, |
| {'imm_code': imm_code, 'code': code, |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = ImmDeclare.subst(iop) |
| decoder_output = ImmConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = ImmExecute.subst(iop) |
| }}; |
| |
| def format FenceOp(code, imm_type='int64_t', *opt_flags) {{ |
| regs = ['destRegIdx(0)','srcRegIdx(0)'] |
| iop = InstObjParams(name, Name, 'ImmOp<%s>' % imm_type, |
| {'code': code, 'imm_code': 'imm = sext<12>(IMM12);', |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = ImmDeclare.subst(iop) |
| decoder_output = ImmConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = FenceExecute.subst(iop) |
| }}; |
| |
| def format BOp(code, *opt_flags) {{ |
| imm_code = """ |
| imm = BIMM12BITS4TO1 << 1 | |
| BIMM12BITS10TO5 << 5 | |
| BIMM12BIT11 << 11 | |
| IMMSIGN << 12; |
| imm = sext<13>(imm); |
| """ |
| regs = ['srcRegIdx(0)','srcRegIdx(1)'] |
| iop = InstObjParams(name, Name, 'ImmOp<int64_t>', |
| {'code': code, 'imm_code': imm_code, |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = BranchDeclare.subst(iop) |
| decoder_output = ImmConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = BranchExecute.subst(iop) |
| }}; |
| |
| def format Jump(code, *opt_flags) {{ |
| regs = ['srcRegIdx(0)'] |
| iop = InstObjParams(name, Name, 'ImmOp<int64_t>', |
| {'code': code, 'imm_code': 'imm = sext<12>(IMM12);', |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = JumpDeclare.subst(iop) |
| decoder_output = JumpConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = JumpExecute.subst(iop) |
| }}; |
| |
| def format UOp(code, *opt_flags) {{ |
| regs = ['destRegIdx(0)'] |
| iop = InstObjParams(name, Name, 'ImmOp<int64_t>', |
| {'code': code, 'imm_code': 'imm = IMM20;', |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = ImmDeclare.subst(iop) |
| decoder_output = ImmConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = ImmExecute.subst(iop) |
| }}; |
| |
| def format JOp(code, *opt_flags) {{ |
| imm_code = """ |
| imm = UJIMMBITS10TO1 << 1 | |
| UJIMMBIT11 << 11 | |
| UJIMMBITS19TO12 << 12 | |
| IMMSIGN << 20; |
| imm = sext<21>(imm); |
| """ |
| pc = 'pc.set(pc.pc() + imm);' |
| regs = ['destRegIdx(0)'] |
| iop = InstObjParams(name, Name, 'ImmOp<int64_t>', |
| {'code': code, 'imm_code': imm_code, |
| 'regs': ','.join(regs)}, opt_flags) |
| header_output = BranchDeclare.subst(iop) |
| decoder_output = JumpConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = BranchExecute.subst(iop) |
| }}; |
| |
| def format SystemOp(code, *opt_flags) {{ |
| iop = InstObjParams(name, Name, 'SystemOp', code, opt_flags) |
| header_output = BasicDeclare.subst(iop) |
| decoder_output = BasicConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = BasicExecute.subst(iop) |
| }}; |
| |
| def format CSROp(code, *opt_flags) {{ |
| iop = InstObjParams(name, Name, 'CSROp', code, opt_flags) |
| header_output = BasicDeclare.subst(iop) |
| decoder_output = BasicConstructor.subst(iop) |
| decode_block = BasicDecode.subst(iop) |
| exec_output = CSRExecute.subst(iop) |
| }}; |
