Function ExecuteCMP

MdeModulePkg/Universal/EbcDxe/EbcExecute.c:3166–3312

Execute the EBC CMP instruction. Instruction syntax: CMP[32|64][eq|lte|gte|ulte|ugte] R1, {@}R2 {Index16|Immed16} @param VmPtr A pointer to a VM context. @retval EFI_UNSUPPORTED The opcodes/operands is not supported. @retval EFI_SUCCESS The instruction is executed successfully. **/

**/
EFI_STATUS
ExecuteCMP (
  IN VM_CONTEXT *VmPtr
  )
{
  UINT8   Opcode;
  UINT8   Operands;
  UINT8   Size;
  INT16   Index16;
  UINT32  Flag;
  INT64   Op2;
  INT64   Op1;

  //
  // Get opcode and operands
  //
  Opcode    = GETOPCODE (VmPtr);
  Operands  = GETOPERANDS (VmPtr);
  //
  // Get the register data we're going to compare to
  //
  Op1 = VmPtr->Gpr[OPERAND1_REGNUM (Operands)];
  //
  // Get immediate data
  //
  if ((Opcode & OPCODE_M_IMMDATA) != 0) {
    if (OPERAND2_INDIRECT (Operands)) {
      Index16 = VmReadIndex16 (VmPtr, 2);
    } else {
      Index16 = VmReadImmed16 (VmPtr, 2);
    }

    Size = 4;
  } else {
    Index16 = 0;
    Size    = 2;
  }
  //
  // Now get Op2
  //
  if (OPERAND2_INDIRECT (Operands)) {
    if ((Opcode & OPCODE_M_64BIT) != 0) {
      Op2 = (INT64) VmReadMem64 (VmPtr, (UINTN) (VmPtr->Gpr[OPERAND2_REGNUM (Operands)] + Index16));
    } else {
      //
      // 32-bit operations. 0-extend the values for all cases.
      //
      Op2 = (INT64) (UINT64) ((UINT32) VmReadMem32 (VmPtr, (UINTN) (VmPtr->Gpr[OPERAND2_REGNUM (Operands)] + Index16)));
    }
  } else {
    Op2 = VmPtr->Gpr[OPERAND2_REGNUM (Operands)] + Index16;
  }
  //
  // Now do the compare
  //
  Flag = 0;
  if ((Opcode & OPCODE_M_64BIT) != 0) {
    //