arch-riscv: Move standard ops out of ISA

This patch removes static portions of the standard instruction types
from the generated ISA code and puts them into arch/riscv/insts. Some
dynamically-generated content is left behind for each individual
instruction's implementation. Also, BranchOp is removed due to its
similarity with ImmOp and ImmOp and UImmOp are joined into a single
templated class, ImmOp<T>.

Change-Id: I1bf47c8b8a92a5be74a50909fcc51d8551185a2a
Reviewed-on: https://gem5-review.googlesource.com/6022
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>

1 files changed, 5 insertions, 146 deletions

diff --git a/src/arch/riscv/isa/formats/standard.isa b/src/arch/riscv/isa/formats/standard.isa
index 35c3fa878..e68cedfe2 100644
--- a/src/arch/riscv/isa/formats/standard.isa
+++ b/src/arch/riscv/isa/formats/standard.isa
@@ -33,147 +33,6 @@
 //
 // Integer instructions
 //
-output header {{
-    /**
-     * Base class for operations that work only on registers
-     */
-    class RegOp : public RiscvStaticInst
-    {
-      protected:
-        /// Constructor
-        RegOp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : RiscvStaticInst(mnem, _machInst, __opClass)
-        {}
-
-        std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
-    };
-
-    /**
-     * Base class for operations with signed immediates
-     */
-    class ImmOp : public RiscvStaticInst
-    {
-      protected:
-        int64_t imm;
-
-        /// Constructor
-        ImmOp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : RiscvStaticInst(mnem, _machInst, __opClass), imm(0)
-        {}
-
-        virtual std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const = 0;
-    };
-
-    /**
-     * Base class for operations with unsigned immediates
-     */
-    class UImmOp : public RiscvStaticInst
-    {
-      protected:
-        uint64_t imm;
-
-        /// Constructor
-        UImmOp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : RiscvStaticInst(mnem, _machInst, __opClass), imm(0)
-        {}
-
-        virtual std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const = 0;
-    };
-
-    /**
-     * Base class for operations with branching
-     */
-    class BranchOp : public ImmOp
-    {
-      protected:
-        /// Constructor
-        BranchOp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : ImmOp(mnem, _machInst, __opClass)
-        {}
-
-        using StaticInst::branchTarget;
-
-        virtual RiscvISA::PCState
-        branchTarget(ThreadContext *tc) const
-        {
-            return StaticInst::branchTarget(tc);
-        }
-
-        virtual RiscvISA::PCState
-        branchTarget(const RiscvISA::PCState &branchPC) const
-        {
-            return StaticInst::branchTarget(branchPC);
-        }
-
-        virtual std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const = 0;
-    };
-
-    /**
-     * Base class for system operations
-     */
-    class SystemOp : public RiscvStaticInst
-    {
-      public:
-        /// Constructor
-        SystemOp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : RiscvStaticInst(mnem, _machInst, __opClass)
-        {}
-
-        std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const
-        {
-            return mnemonic;
-        }
-    };
-
-    /**
-     * Base class for CSR operations
-     */
-    class CSROp : public RiscvStaticInst
-    {
-      protected:
-        uint64_t csr;
-        uint64_t uimm;
-
-      public:
-        /// Constructor
-        CSROp(const char *mnem, MachInst _machInst, OpClass __opClass)
-            : RiscvStaticInst(mnem, _machInst, __opClass),
-              csr(FUNCT12), uimm(CSRIMM)
-        {}
-
-        std::string
-        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
-    };
-}};
-
-//Outputs to decoder.cc
-output decoder {{
-    std::string
-    RegOp::generateDisassembly(Addr pc, const SymbolTable *symtab) const
-    {
-        std::stringstream ss;
-        ss << mnemonic << ' ' << registerName(_destRegIdx[0]) << ", " <<
-            registerName(_srcRegIdx[0]) << ", " <<
-            registerName(_srcRegIdx[1]);
-        return ss.str();
-    }
-
-    std::string
-    CSROp::generateDisassembly(Addr pc, const SymbolTable *symtab) const
-    {
-        std::stringstream ss;
-        ss << mnemonic << ' ' << registerName(_destRegIdx[0]) << ", ";
-        if (_numSrcRegs > 0)
-            ss << registerName(_srcRegIdx[0]) << ", ";
-        ss << MiscRegNames.at(csr);
-        return ss.str();
-    }
-}};
 
 def template ImmDeclare {{
     //
@@ -362,7 +221,7 @@ def format ROp(code, *opt_flags) {{
 def format IOp(code, *opt_flags) {{
     imm_code = 'imm = IMM12; if (IMMSIGN > 0) imm |= ~((uint64_t)0x7FF);'
     regs = ['_destRegIdx[0]','_srcRegIdx[0]']
-    iop = InstObjParams(name, Name, 'ImmOp',
+    iop = InstObjParams(name, Name, 'ImmOp<int64_t>',
         {'code': code, 'imm_code': imm_code,
          'regs': ','.join(regs)}, opt_flags)
     header_output = ImmDeclare.subst(iop)
@@ -380,7 +239,7 @@ def format BOp(code, *opt_flags) {{
                     imm |= ~((uint64_t)0xFFF);
                """
     regs = ['_srcRegIdx[0]','_srcRegIdx[1]']
-    iop = InstObjParams(name, Name, 'BranchOp',
+    iop = InstObjParams(name, Name, 'ImmOp<int64_t>',
         {'code': code, 'imm_code': imm_code,
          'regs': ','.join(regs)}, opt_flags)
     header_output = BranchDeclare.subst(iop)
@@ -392,7 +251,7 @@ def format BOp(code, *opt_flags) {{
 def format Jump(code, *opt_flags) {{
     imm_code = 'imm = IMM12; if (IMMSIGN > 0) imm |= ~((uint64_t)0x7FF);'
     regs = ['_destRegIdx[0]','_srcRegIdx[0]']
-    iop = InstObjParams(name, Name, 'BranchOp',
+    iop = InstObjParams(name, Name, 'ImmOp<int64_t>',
         {'code': code, 'imm_code': imm_code,
          'regs': ','.join(regs)}, opt_flags)
     header_output = JumpDeclare.subst(iop)
@@ -404,7 +263,7 @@ def format Jump(code, *opt_flags) {{
 def format UOp(code, *opt_flags) {{
     imm_code = 'imm = (int32_t)(IMM20 << 12);'
     regs = ['_destRegIdx[0]']
-    iop = InstObjParams(name, Name, 'ImmOp',
+    iop = InstObjParams(name, Name, 'ImmOp<int64_t>',
         {'code': code, 'imm_code': imm_code,
          'regs': ','.join(regs)}, opt_flags)
     header_output = ImmDeclare.subst(iop)
@@ -423,7 +282,7 @@ def format JOp(code, *opt_flags) {{
                """
     pc = 'pc.set(pc.pc() + imm);'
     regs = ['_destRegIdx[0]']
-    iop = InstObjParams(name, Name, 'BranchOp',
+    iop = InstObjParams(name, Name, 'ImmOp<int64_t>',
         {'code': code, 'imm_code': imm_code,
          'regs': ','.join(regs)}, opt_flags)
     header_output = BranchDeclare.subst(iop)