3c_disasm/instr/ldi.cpp

   1 #include "../Iinstr.hpp"
   2
   3
   4 class Cldi : public Iinstr {
   5         public:
   6                 Cldi();
   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 Cldi();
  22 }
  23
  24 Iinstr* Cldi::getNew()
  25 {
  26     return new Cldi();
  27 }
  28 /**
  29  * Name:      destroy_instruction
  30  * Purpose:   if compiled as shared library, this functions destoys the
  31               instruction object
  32
  33  * Parameter: IInstruction - the instruction object to delete
  34  */
  35 extern "C" void destroy_instruction(Iinstr* p) {
  36     delete p;
  37 }
  38
  39 Cldi::Cldi()
  40 {
  41         opcode = B5(11010);
  42         name = "ldi";
  43 }
  44
  45 void Cldi::evalInstr()
  46 {
  47         this->m_s = argbits[2];
  48         this->m_hl = argbits[1];
  49
  50         argbits >>= 3;
  51         dynamic_bitset<> immb = argbits;
  52         immb.resize(16);
  53         this->m_imm = this->generate16ImmSign(immb.to_ulong());
  54
  55         argbits >>= 16;
  56         m_rd = this->getRegister(argbits);
  57 }
  58
  59 void Cldi::execInstr()
  60 {
  61         //cout << "should exec " << this->toString() << endl;
  62         CDat val = this->m_cpu->getRegister(this->m_rd);
  63         if(this->m_s == false) {
  64                 if(this->m_hl == false) {
  65                         val &= 0xFFFF0000;
  66                 }
  67                 else {
  68                         val &= 0x0000FFFF;
  69                 }
  70                 this->m_cpu->setRegister(this->m_rd, val + this->m_imm);
  71         }
  72         else {
  73                 this->m_cpu->setRegister(this->m_rd, this->m_imm);
  74         }
  75 }
  76
  77 std::string Cldi::toString()
  78 {
  79         stringstream op;
  80         op << this->getName();
  81
  82         if(m_hl) op << 'H';
  83         if(m_s) op << 'S';
  84
  85         op << this->getConditionFlag() << " r" << m_rd << ", " << m_imm;
  86
  87         return op.str();
  88 }