diff options
Diffstat (limited to 'src/arch/arm/isa/formats/branch.isa')
-rw-r--r-- | src/arch/arm/isa/formats/branch.isa | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/src/arch/arm/isa/formats/branch.isa b/src/arch/arm/isa/formats/branch.isa index 3e69c9532..b8fbb982d 100644 --- a/src/arch/arm/isa/formats/branch.isa +++ b/src/arch/arm/isa/formats/branch.isa @@ -33,190 +33,6 @@ // Control transfer instructions // -output header {{ - -#include <iostream> - - /** - * Base class for instructions whose disassembly is not purely a - * function of the machine instruction (i.e., it depends on the - * PC). This class overrides the disassemble() method to check - * the PC and symbol table values before re-using a cached - * disassembly string. This is necessary for branches and jumps, - * where the disassembly string includes the target address (which - * may depend on the PC and/or symbol table). - */ - class PCDependentDisassembly : public PredOp - { - protected: - /// Cached program counter from last disassembly - mutable Addr cachedPC; - - /// Cached symbol table pointer from last disassembly - mutable const SymbolTable *cachedSymtab; - - /// Constructor - PCDependentDisassembly(const char *mnem, MachInst _machInst, - OpClass __opClass) - : PredOp(mnem, _machInst, __opClass), - cachedPC(0), cachedSymtab(0) - { - } - - const std::string & - disassemble(Addr pc, const SymbolTable *symtab) const; - }; - - /** - * Base class for branches (PC-relative control transfers), - * conditional or unconditional. - */ - class Branch : public PCDependentDisassembly - { - protected: - /// target address (signed) Displacement . - int32_t disp; - - /// Constructor. - Branch(const char *mnem, MachInst _machInst, OpClass __opClass) - : PCDependentDisassembly(mnem, _machInst, __opClass), - disp(OFFSET << 2) - { - //If Bit 26 is 1 then Sign Extend - if ( (disp & 0x02000000) > 0 ) { - disp |= 0xFC000000; - } - } - - Addr branchTarget(Addr branchPC) const; - - std::string - generateDisassembly(Addr pc, const SymbolTable *symtab) const; - }; - - /** - * Base class for branch and exchange instructions on the ARM - */ - class BranchExchange : public PredOp - { - protected: - /// Constructor - BranchExchange(const char *mnem, MachInst _machInst, - OpClass __opClass) - : PredOp(mnem, _machInst, __opClass) - { - } - - std::string - generateDisassembly(Addr pc, const SymbolTable *symtab) const; - }; - - - /** - * Base class for jumps (register-indirect control transfers). In - * the Arm ISA, these are always unconditional. - */ - class Jump : public PCDependentDisassembly - { - protected: - - /// Displacement to target address (signed). - int32_t disp; - - uint32_t target; - - public: - /// Constructor - Jump(const char *mnem, MachInst _machInst, OpClass __opClass) - : PCDependentDisassembly(mnem, _machInst, __opClass), - disp(OFFSET << 2) - { - } - - Addr branchTarget(ThreadContext *tc) const; - - std::string - generateDisassembly(Addr pc, const SymbolTable *symtab) const; - }; -}}; - -output decoder {{ - Addr - Branch::branchTarget(Addr branchPC) const - { - return branchPC + 8 + disp; - } - - Addr - Jump::branchTarget(ThreadContext *tc) const - { - Addr NPC = tc->readPC() + 8; - uint64_t Rb = tc->readIntReg(_srcRegIdx[0]); - return (Rb & ~3) | (NPC & 1); - } - - const std::string & - PCDependentDisassembly::disassemble(Addr pc, - const SymbolTable *symtab) const - { - if (!cachedDisassembly || - pc != cachedPC || symtab != cachedSymtab) - { - if (cachedDisassembly) - delete cachedDisassembly; - - cachedDisassembly = - new std::string(generateDisassembly(pc, symtab)); - cachedPC = pc; - cachedSymtab = symtab; - } - - return *cachedDisassembly; - } - - std::string - Branch::generateDisassembly(Addr pc, const SymbolTable *symtab) const - { - std::stringstream ss; - - ccprintf(ss, "%-10s ", mnemonic); - - Addr target = pc + 8 + disp; - - std::string str; - if (symtab && symtab->findSymbol(target, str)) - ss << str; - else - ccprintf(ss, "0x%x", target); - - return ss.str(); - } - - std::string - BranchExchange::generateDisassembly(Addr pc, const SymbolTable *symtab) const - { - std::stringstream ss; - - ccprintf(ss, "%-10s ", mnemonic); - - if (_numSrcRegs > 0) { - printReg(ss, _srcRegIdx[0]); - } - - return ss.str(); - } - - std::string - Jump::generateDisassembly(Addr pc, const SymbolTable *symtab) const - { - std::stringstream ss; - - ccprintf(ss, "%-10s ", mnemonic); - - return ss.str(); - } -}}; - def format Branch(code,*opt_flags) {{ #Build Instruction Flags |