text: /*BEGIN_LEGAL 
  Intel Open Source License 
  
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  in binary form must reproduce the above copyright notice, this list of
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  specific prior written permission.
   
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  END_LEGAL */
  /*
   *  This application checks that changes made to the x87, sse and avx registers by the tool, before any application
   *  modification was made, are in fact visible.
   *  Since the application does not change these registers, the appropriate bits in the XSTATE_BV save mask are cleared.
   *  Pin must set the necessary bits in order for the tool's changes to take effect upon xrstor.
   *
   *  Usage: CheckXStateBV <component>
   *  where component is one of:
   *      x87 - test the x87 state component
   *      SSE - test the sse state component
   *      AVX - test the avx state component
   */
  
  #include <iostream>
  #include <cstring>
  #include "xstateBVUtils.h"
  
  using std::cerr;
  using std::endl;
  
  
  #ifdef TARGET_WINDOWS
  # define ASMNAME(name)
  # define ALIGN64 __declspec(align(64))
  #else
  # define ASMNAME(name) asm(name)
  # define ALIGN64 __attribute__ ((aligned (64)))
  #endif
  
  
  /////////////////////
  // EXTERNAL FUNCTIONS
  /////////////////////
  
  extern "C" void DoXsave() ASMNAME("DoXsave");
  
  
  /////////////////////
  // GLOBAL VARIABLES
  /////////////////////
  
  extern "C"
  {
  unsigned char ALIGN64 xsaveArea[832] ASMNAME("xsaveArea");
  }
  
  
  /////////////////////
  // UTILITY FUNCTIONS
  /////////////////////
  
  static bool IsOn(TEST_REG_CLASS regClass)
  {
      const unsigned char xstateBv = xsaveArea[512];
      return (xstateBv & xstateBvMasks[regClass]);
  }
  
  
  static void GetRegValue(unsigned char* buf, TEST_REG_CLASS regClass)
  {
      unsigned int size = testRegSize[regClass];
      if (TEST_REG_CLASS_AVX == regClass)
      {
          // First get the upper half
          regClass = TEST_REG_CLASS_SSE;
          size = testRegSize[regClass];
          memcpy(buf + size, &xsaveArea[testRegLocation[TEST_REG_CLASS_AVX]], size);
          // Now get the lower half (xmm)
      }
      memcpy(buf, &xsaveArea[testRegLocation[regClass]], testRegSize[regClass]);
  }
  
  
  // This is a placeholder for the tool to change the register values.
  extern "C" void ChangeRegisterValue() ASMNAME("ChangeRegisterValue");
  void ChangeRegisterValue()
  {
      // does nothing
  }
  
  
  // This is a placeholder for the tool to start execution after changing the register.
  extern "C" void ExecuteAt() ASMNAME("ExecuteAt");
  void ExecuteAt()
  {
      // does nothing
  }
  
  
  /////////////////////
  // MAIN FUNCTION
  /////////////////////
  
  /*
   * Expected arguments:
   * [1]  - component
   */
  int main(int argc, const char* argv[])
  {
      // Verify one command line argument - component
      if (argc != 2)
      {
          cerr << "ERROR: Expected 1 command line argument, got " << argc-1 << ". Aborting test." << endl;
          return 1;
      }
  
      // Identify the requested state component.
      TEST_REG_CLASS regClass = GetTestReg(argv[1]);
      if (TEST_REG_CLASS_INVALID == regClass)
      {
          cerr << "ERROR: Unknown state component '" << argv[1] << "'. Aborting test." << endl;
          return 2;
      }
  
      // Perform the test.
      unsigned char before[32] = { 0 }; // empty buffer large enough to hold any context register up to AVX.
      unsigned char after[32] = { 0 }; // empty buffer large enough to hold any context register up to AVX.
      DoXsave(); // get the register value before the change
      if (IsOn(regClass))
      {
          cerr << "WARNING: The " << componentStrings[regClass] << " state bit was expected to be clear at this point "
               << "in the test but it was set." << endl;
      }
      GetRegValue(before, regClass);
  
      ChangeRegisterValue(); // allow the tool to change the register value.
      ExecuteAt();
  
      bool success = true;
      DoXsave(); // get the register value before the change
      if (!IsOn(regClass))
      {
          cerr << "ERROR: The " << componentStrings[regClass] << " state bit was expected to be set at this point "
               << "in the test but it was clear." << endl;
          success = false;
      }
      GetRegValue(after, regClass);
      if (0 == memcmp(before, after, testRegSize[regClass]))
      {
          cerr << "ERROR: Error while testing the " << componentStrings[regClass] << " state. The values before and after "
               << "the test were the same." << endl;
          success = false;
      }
      if (0 != memcmp(after, toolRegisterValues[regClass], testRegSize[regClass]))
      {
          cerr << "ERROR: Error while testing the " << componentStrings[regClass] << " state. The value after the tool's change "
               << "did not match the expected value." << endl;
          success = false;
      }
  
      if (!success) return 3;
      return 0;
  }
  