3c_disasm/instr/ldw.cpp

   1 #include "../Iinstr.hpp"
   2
   3
   4 class Cldw : public Iinstr {
   5         public:
   6                 Cldw();
   7                 void evalInstr();
   8                 void execInstr();
   9                 std::string toString();
  10                 Iinstr* getNew();
  11 };
  12
  13 /**
  14  * Name:      create_instruction
  15  * Purpose:   if compiled as shared library, this functions creates the
  16               instruction object
  17
  18  * Returns:   pointer to instruction object
  19  */
  20 extern "C" Iinstr* create_instruction() {
  21     return new Cldw();
  22 }
  23
  24 Iinstr* Cldw::getNew()
  25 {
  26     return new Cldw();
  27 }
  28
  29 /**
  30  * Name:      destroy_instruction
  31  * Purpose:   if compiled as shared library, this functions destoys the
  32               instruction object
  33
  34  * Parameter: IInstruction - the instruction object to delete
  35  */
  36 extern "C" void destroy_instruction(Iinstr* p) {
  37     delete p;
  38 }
  39
  40 Cldw::Cldw()
  41 {
  42         opcode = B5(01110);
  43         name = "ldw";
  44 }
  45
  46 void Cldw::evalInstr()
  47 {
  48         this->m_s = true;
  49
  50         dynamic_bitset<> immb = argbits;
  51         immb.resize(15);
  52         this->m_imm = this->generate15ImmSign(immb.to_ulong());
  53
  54         argbits >>= 15;
  55         m_ra = this->getRegister(argbits);
  56         argbits >>= 4;
  57         m_rd = this->getRegister(argbits);
  58
  59 }
  60
  61 void Cldw::execInstr()
  62 {
  63         //cout << "should exec " << this->toString() << endl;
  64         CDat val = this->m_cpu->getRegister(this->m_ra);
  65         val += m_imm;
  66         val = this->m_cpu->getRAM(val);
  67         this->m_cpu->setRegister(this->m_rd,val);
  68 }
  69
  70 std::string Cldw::toString()
  71 {
  72         stringstream op;
  73         op << this->getName();
  74
  75         op << this->getConditionFlag() << " r" << m_rd << ", " << m_imm << "(r" <<  m_ra << ")";
  76
  77         return op.str();
  78 }