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// ----------------------------------------------------------------------------

// Interprets ORPSoC's Cycle Accurate model binary format log files

// Contributor Julius Baxter <jb@orsoc.se>

// This program is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation, either version 3 of the License, or (at your

// option) any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

// License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// ----------------------------------------------------------------------------

// $Id$

#include <string.h>

#include <iostream>

#include <iomanip>

#include <cstdlib>

#include <stdint.h> 

#include <fstream>

#include <sys/types.h>

using namespace std;

struct s_binary_output_buffer{

  long long insn_count;

  uint32_t pc;

  uint32_t insn;

  char exception;

  uint32_t regs[32];

  uint32_t sr;

  uint32_t epcr0;

  uint32_t eear0;

  uint32_t eser0;

} __attribute__((__packed__));

struct s_binary_output_buffer_sans_regs{

  long long insn_count;

  uint32_t pc;

  uint32_t insn;

  char exception;

} __attribute__((__packed__));

void printUsage()

{

  cerr << endl << "Error: No input file specified." << endl;

  cerr << endl;

  cerr << "Usage: binlog2readable <options> <file>" << endl;

  cerr << endl;

  cerr << "Convert binary formatted ORPSoC execution log <file> to human readable format" << endl;

  cerr << "Options:" << endl;

  cerr << "  -o <file>\tOutput file, if not specified stdout is used" << endl;

  cerr << "  --skip <num>\tSkip <num> instructions from the front of the log" << endl;

  cerr << "  --last <num>\tPrint the last <num> instructions from the end of the log" << endl;

  cerr << endl;

}

int main(int argc, char **argv)

{

  ifstream inFile;

  ofstream outFile; /* Anyone know how to make these things into stdouts?? */

  unsigned long long filesize;

  int using_std_out = 1; /* Default out is to stdout */

  char reg_vals_included;

  int skip_insns = 0;

  int skip_insns_from_end = -1;

  struct s_binary_output_buffer buf;

  struct s_binary_output_buffer_sans_regs buf_sans_regs;

  if (argc < 2)

    {

      printUsage();

      return 1;

    }

  for(int i=1; i < argc; i++)

    {

      if ((strcmp(argv[i], "-s")==0) ||

          (strcmp(argv[i], "--skip")==0))

        {

          if (i+1 < argc)

            if(argv[i+1][0] != '-')

              {

                skip_insns = atoi(argv[i+1]);

                skip_insns_from_end = 0;

                i++;

              }

        }

      else if (strcmp(argv[i], "--last")==0)

        {

          if (i+1 < argc)

            if(argv[i+1][0] != '-')

              {

                skip_insns = atoi(argv[i+1]);

                skip_insns_from_end = 1;

                i++;

              }

        }

      else if (strcmp(argv[i], "-o")==0)

        {

          if (i+1 < argc)

            if(argv[i+1][0] != '-')

              {

                /* Were given a file to output to */

                outFile.open(argv[i+1], ios::out);

                if (!outFile.is_open())

                  {

                    cerr << "Error: unable to open file " << argv[2] << " for writing." << endl;

                    if (inFile.is_open()) inFile.close();

                    return 1;

                  }

                using_std_out = 0;

              }

        }

      else

        {

          /* Input file */

          if (!inFile.is_open())

            {

              inFile.open(argv[i], ios::in | ios::binary);

              if (!inFile.is_open())

                {

                  cerr << "Error: unable to open file " << argv[1] << " for reading." << endl;

                  return 1;

                }

            }

        }

    }

  /* First byte contains whether we've got register values included or

  just executed instruction, pc and number*/

  inFile.seekg(0); /* Position getpointer to start of file*/

  inFile.read(&reg_vals_included, 1);

  if (skip_insns)

    {

      /* Position the file pointer to the right place before printing out */

      if (skip_insns_from_end == -1)

        goto close_exit;

      if (skip_insns_from_end)

        {

          // go to end

          inFile.seekg(0,ios::end);

          filesize = inFile.tellg();

          inFile.seekg(0);

          //cout << "filesize: " << filesize << endl;

          // seek backwards

          if (reg_vals_included)

            for (int i=0;i<skip_insns;i++)

              inFile.seekg(filesize-skip_insns*sizeof(struct s_binary_output_buffer));

          else

            for (int i=0;i<skip_insns;i++)

              inFile.seekg(filesize-(skip_insns*sizeof(struct s_binary_output_buffer_sans_regs)));

        }

      else

        {

          // skip from start

          inFile.seekg(1);

          if (reg_vals_included)

            inFile.seekg(skip_insns*sizeof(struct s_binary_output_buffer),ios::cur);

          else

            inFile.seekg((skip_insns*sizeof(struct s_binary_output_buffer_sans_regs)),ios::cur);

        }

    }

  else

    inFile.seekg(1);

  //cout << "starting at: " << inFile.tellg() << endl;

  if (reg_vals_included)

    {

      if (using_std_out)

        {

          while (1)

            {

              inFile.read((char*)&buf, sizeof(struct s_binary_output_buffer));

              if(!inFile.eof())

                {

                  cout << "\nEXECUTED("<< std::setfill(' ') << std::setw(11) << dec << buf.insn_count << "): " << std::setfill('0') << hex << std::setw(8) << buf.pc << ":  " << hex << std::setw(8) << buf.insn;

                  if(buf.exception) cout << "  (exception)";

                  cout << endl;

                  // Print general purpose register contents

                  for (int i=0; i<32; i++)

                    {

                      if ((i%4 == 0)&&(i>0)) cout << endl;

                      cout << std::setfill('0');

                      cout << "GPR" << dec << std::setw(2) << i << ": " <<  hex << std::setw(8) << buf.regs[i] << "  ";

                    }

                  cout << endl;

                  cout << "SR   : " <<  hex << std::setw(8) << buf.sr << "  ";

                  cout << "EPCR0: " <<  hex << std::setw(8) << buf.epcr0 << "  ";

                  cout << "EEAR0: " <<  hex << std::setw(8) << buf.eear0 << "  ";

                  cout << "ESR0 : " <<  hex << std::setw(8) << buf.eser0 << endl;

                }

              else

                break;

            }

        }

      else

        {

          while(1)

            {

              /* Outputting to a file */

              inFile.read((char*)&buf, sizeof(struct s_binary_output_buffer));

              //inFile.seekg(sizeof(struct s_binary_output_buffer), ios::cur);

              if(!inFile.eof())

                {

                  outFile << "\nEXECUTED("<< std::setfill(' ') << std::setw(11) << dec << buf.insn_count << "): " << std::setfill('0') << hex << std::setw(8) << buf .pc << ":  " << hex << std::setw(8) << buf.insn;

                  if(buf.exception) outFile << "  (exception)";

                  outFile << endl;

                  // Print general purpose register contents

                  for (int i=0; i<32; i++)

                    {

                      if ((i%4 == 0)&&(i>0)) outFile << endl;

                      outFile << std::setfill('0');

                      outFile << "GPR" << dec << std::setw(2) << i << ": " <<  hex << std::setw(8) << buf.regs[i] << "  ";

                    }

                  outFile << endl;

                  outFile << "SR   : " <<  hex << std::setw(8) << buf.sr << "  ";

                  outFile << "EPCR0: " <<  hex << std::setw(8) << buf.epcr0 << "  ";

                  outFile << "EEAR0: " <<  hex << std::setw(8) << buf.eear0 << "  ";

                  outFile << "ESR0 : " <<  hex << std::setw(8) << buf.eser0 << endl;

                }

              else

                break;

            }

        }

    }

      else /* No regs in data */

    {

      if (using_std_out)

        {

          while(1)

            {

              inFile.read((char*)&buf_sans_regs, sizeof(struct s_binary_output_buffer_sans_regs));

              if (!inFile.eof())

                {

                  cout << "\nEXECUTED("<< std::setfill(' ') << std::setw(11) << dec << buf_sans_regs.insn_count << "): " << std::setfill('0') << hex << std::setw(8) << buf_sans_regs.pc << ":  " << hex << std::setw(8) << buf_sans_regs.insn;

                  if(buf_sans_regs.exception) cout << "  (exception)";

                  cout << endl;

                }

              else

                break;

            }

          cout << endl;

        }

      else

        {

          /* Outputting to a file */

          while(!inFile.eof())

            {

              inFile.read((char*)&buf_sans_regs, sizeof(struct s_binary_output_buffer_sans_regs));

              //inFile.seekg(sizeof(struct s_binary_output_buffer_sans_regs), ios::cur);

              outFile << "\nEXECUTED("<< std::setfill(' ') << std::setw(11) << dec << buf_sans_regs.insn_count << "): " << std::setfill('0') << hex << std::setw(8) << buf_sans_regs.pc << ":  " << hex << std::setw(8) << buf_sans_regs.insn;

              if(buf_sans_regs.exception) outFile << "  (exception)" << endl;

              outFile << endl;

            }

          outFile << endl;

        }

    }

 close_exit:

  inFile.close();

  if (!using_std_out) outFile.close();

}