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

// SystemC OpenRISC 1200 Monitor: implementation

// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>

// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

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

// This file is part of the cycle accurate model of the OpenRISC 1000 based

// system-on-chip, ORPSoC, built using Verilator.

// 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 <iostream>

#include <iomanip>

#include <fstream>

#include <sys/types.h>

#include <netinet/in.h>

using namespace std;

#include "Or1200MonitorSC.h"

#include "OrpsocMain.h"

#include <errno.h>

int monitor_to_gdb_pipe[2][2]; // [0][] - monitor to gdb, [1][] - gdb to monitor, [][0] - read, [][1] - write

SC_HAS_PROCESS( Or1200MonitorSC );

//! Constructor for the OpenRISC 1200 monitor

//! @param[in] name  Name of this module, passed to the parent constructor.

//! @param[in] accessor  Accessor class for this Verilated ORPSoC model

Or1200MonitorSC::Or1200MonitorSC (sc_core::sc_module_name   name,

                                  OrpsocAccess             *_accessor,

                                  MemoryLoad               *_memoryload,

                                  int argc,

                                  char *argv[]) :

  sc_module (name),

  accessor (_accessor),

  memoryload(_memoryload)

{

  string logfileDefault(DEFAULT_EXEC_LOG_FILE);

  string logfileNameString;

  logging_enabled = false;

  logfile_name_provided = false;

  profiling_enabled = false;

  string profileFileName(DEFAULT_PROF_FILE);

  memdumpFileName = (DEFAULT_MEMDUMP_FILE);

  int memdump_start = 0; int memdump_end = 0;

  do_memdump = false; // Default is not to do a dump of RAM at finish

  logging_regs = true; // Execution log includes register values by default

  bool rsp_server_enabled = false;

  wait_for_stall_cmd_response = false; // Default

  insn_count = insn_count_rst = 0;

  cycle_count = cycle_count_rst = 0;

  exit_perf_summary_enabled = true; // Simulation exit performance summary is 

                                    // on by default. Turn off with "-q" on the 

                                    // cmd line

  monitor_for_crash = false;

  lookslikewevecrashed_count = crash_monitor_buffer_head = 0;

  bus_trans_log_enabled = bus_trans_log_name_provided =

    bus_trans_log_start_delay_enable = false; // Default

  string bus_trans_default_log_name(DEFAULT_BUS_LOG_FILE);

  string bus_trans_log_file;

  // Parse the command line options

  bool cmdline_name_found = false;

  if (argc > 1)

    {

      // Search through the command line parameters for the "-log" option

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

        {

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

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

            {

              logging_enabled = true;

              binary_log_format = false;

              if (i+1 < argc)

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

                  {

                    logfileNameString = (argv[i+1]);

                    logfile_name_provided = true;

                  }

              if (!logfile_name_provided)

                logfileNameString = logfileDefault;

            }

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

            {

              logging_regs = false;

            }

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

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

            {

              logging_enabled = true;

              binary_log_format = true;

              if (i+1 < argc)

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

                  {

                    logfileNameString = (argv[i+1]);

                    logfile_name_provided = true;

                  }

              if (!logfile_name_provided)

                logfileNameString = logfileDefault;

            }

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

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

            {

              monitor_for_crash = true;

            }

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

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

            {

              exit_perf_summary_enabled = false;

            }

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

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

            {

              profiling_enabled = true;

              // Check for !end of command line and that next thing is not a 

              // command

              if ((i+1 < argc)){

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

                  profileFileName = (argv[i+1]);

              }

            }

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

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

            {

              // We need to detect this here too

              rsp_server_enabled = true;

            }

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

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

            {

              do_memdump = true;

              // Check for !end of command line and that next thing is not a 

              // command or a memory address

              if (i+1 < argc)

                {

                  if((argv[i+1][0] != '-') && (strncmp("0x", argv[i+1],2) != 0))

                    {

                      // Hopefully this is the filename we want to use.

                      // All addresses should have preceeding hex identifier 0x

                      memdumpFileName = argv[i+1];

                      // We've used this next index, can safely increment i

                      i++;

                    }

                }

              if (i+1 < argc)

                {

                  if((argv[i+1][0] != '-') && (strncmp("0x", argv[i+1],2) == 0))

                    {

                      // Hopefully this is is the start address

                      // All addresses should have preceeding hex identifier 0x

                      sscanf( argv[i+1], "0x%x", &memdump_start);

                      i++;

                    }

                }

              if (i+1 < argc)

                {

                  if((argv[i+1][0] != '-') && (strncmp("0x", argv[i+1],2) == 0))

                    {

                      // Hopefully this is is the end address

                      // All addresses should have preceeding hex identifier 0x

                      sscanf( argv[i+1], "0x%x", &memdump_end);

                      i++;

                    }

                }

            }

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

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

            {

              bus_trans_log_enabled = true;

              if (i+1 < argc)

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

                  {

                    bus_trans_log_file = (argv[i+1]);

                    bus_trans_log_name_provided = true;

                  }

              if (!bus_trans_log_name_provided)

                bus_trans_log_file = bus_trans_default_log_name;

              // check for a log start delay

              if (i+2 < argc)

                if(argv[i+2][0] != '-')

                  {

                    // We have a bus transaction log start delay

                    bus_trans_log_start_delay_enable = true;

                    int time_val = atoi(argv[i+2]);

                    sc_time log_start_time(time_val,SC_NS);

                    bus_trans_log_start_delay = log_start_time;

                  }

            }

        }

    }

  if (!rsp_server_enabled)

    {

      monitor_to_gdb_pipe[0][0] = monitor_to_gdb_pipe[0][1] = NULL;

      monitor_to_gdb_pipe[1][0] = monitor_to_gdb_pipe[1][1] = NULL;

    }

  // checkInstruction monitors the bus for special NOP instructionsl

  SC_METHOD (checkInstruction);

  sensitive << clk.pos();

  dont_initialize();

  if (profiling_enabled)

    {

      profileFile.open(profileFileName.c_str(), ios::out); // Open profiling log file

      if(profileFile.is_open())

        {

          // If the file was opened OK, then enabled logging and print a message.

          profiling_enabled = true;

          cout << "* Execution profiling enabled. Logging to " << profileFileName << endl;

        }

      // Setup profiling function

      SC_METHOD (callLog);

      sensitive << clk.pos();

      dont_initialize();

      start = clock();

    }

  if(logging_enabled)

    {

      /* Now open the file */

      if (binary_log_format)

        statusFile.open(logfileNameString.c_str(), ios::out | ios::binary);

      else

        statusFile.open(logfileNameString.c_str(), ios::out );

      /* Check the open() */

      if(statusFile.is_open() && binary_log_format)

        {

          cout << "* Processor execution logged in binary format to file: " << logfileNameString << endl;

          /* Write out a byte indicating whether there's register values too */

          statusFile.write((char*)&logging_regs, 1);

        }

      else if (statusFile.is_open() && !binary_log_format)

        cout << "* Processor execution logged to file: " << logfileNameString << endl;

      else

        /* Couldn't open */

        logging_enabled = false;

    }

  if (logging_enabled)

    {

      if (binary_log_format)

        {

          SC_METHOD (displayStateBinary);

        }

      else

        {

          SC_METHOD (displayState);

        }

      sensitive << clk.pos();

      dont_initialize();

      start = clock();

    }

  if (monitor_for_crash)

    {

      cout << "* Crash monitor enabled" << endl;

    }

  // Check sizes we were given from memory dump command line options first

  if (do_memdump)

    {

      if ((memdump_start > ORPSOC_SRAM_SIZE) || (memdump_end > ORPSOC_SRAM_SIZE) ||

          ((memdump_start > memdump_end) && (memdump_end != 0)))

        {

          do_memdump = false;

          cout << "* Memory dump addresses range incorrect. Limit of memory is 0x" << hex <<  ORPSOC_SRAM_SIZE << ". Memory dumping disabled." << endl;

        }

    }

  if (do_memdump)

    {

      // Were we given dump addresses? If not, we dump all of the memory

      // Size of memory isn't clearly defined in any one place. This could lead to

      // big problems when changing size of the RAM in simulation.

      if (memdump_start == 0 && memdump_end == 0)

        memdump_end = ORPSOC_SRAM_SIZE;

      if (memdump_start != 0 && memdump_end == 0)

        {

          // Probably just got the single memorydump param

          // Interpet as a length from 0

          memdump_end = memdump_start;

          memdump_start = 0;

        }

      if (memdump_start & 0x3) memdump_start &= ~0x3; // word-align the start address      

      if (memdump_end & 0x3) memdump_end = (memdump_end+4) & ~0x3; // word-align the start address

      memdump_start_addr = memdump_start;

      memdump_end_addr = memdump_end;

    }

  if (bus_trans_log_enabled)

    {

      // Setup log file and register the bus monitoring function

      busTransLog.open(bus_trans_log_file.c_str(), ios::out );

      if (busTransLog.is_open())

        {

          cout << "* System bus transactions logged to file: " <<

            bus_trans_log_file;

          if (bus_trans_log_start_delay_enable)

            cout << ", on at " << bus_trans_log_start_delay.to_string();

          cout << endl;

        }

      else

        /* Couldn't open */

        bus_trans_log_enabled = false;

    }

  if (bus_trans_log_enabled)

    {

      // Setup profiling function

      SC_METHOD (busMonitor);

      sensitive << clk.pos();

      dont_initialize();

    }

}       // Or1200MonitorSC ()

//! Print usage for the options of this module

void

Or1200MonitorSC::printUsage()

{

  printf("\nLogging and diagnostic options:\n");

  printf("  -p, --profile [<file>]Enable execution profiling output to <file> (default is\n\t\t\t"DEFAULT_PROF_FILE")\n");

  printf("  -l, --log <file>\tLog processor execution to <file>\n");

  printf("      --log-noregs\tLog excludes register contents\n");

  printf("  -b, --binlog <file>\tGenerate binary format execution log (faster, smaller)\n");

  printf("  -q, --quiet\t\tDisable the performance summary at end of simulation\n");

  printf("  -m, --memdump <file> <0xstartaddr> <0xendaddr>\n\t\t\tDump data between <0xstartaddr> and <0xendaddr> from\n\t\t\tthe system's RAM to <file> in binary format on exit\n");

  printf("  -c, --crash-monitor\tDetect when the processor has crashed and exit\n");

  printf("  -u, --bus-log <file> <val>\n\t\t\tLog the wishbone bus transactions to <file>, opt. start\n\t\t\tafter <val> ns\n\n");

}

//! Method to handle special instrutions

//! These are l.nop instructions with constant values. At present the

//! following are implemented:

//! - l.nop 1  Terminate the program

//! - l.nop 2  Report the value in R3

//! - l.nop 3  Printf the string with the arguments in R3, etc

//! - l.nop 4  Print a character

//#define OR1200_OR32_NOP_BITS_31_TO_26               6'b000101

#define OR1200_OR32_NOP               0x14000000

extern int SIM_RUNNING;

void

Or1200MonitorSC::checkInstruction()

{

  uint32_t  r3;

  double    ts;

  uint32_t current_WbInsn, current_WbPC;

  cycle_count++;

  /* Check if this counts as an "executed" instruction */

  if (!accessor->getWbFreeze())

    {

      // Cache writeback stage instruction

      current_WbInsn = accessor->getWbInsn();

      if ((((current_WbInsn & 0xfc000000) != (uint32_t) OR1200_OR32_NOP) || !(current_WbInsn & (1<<16))) && !(accessor->getExceptFlushpipe() && accessor->getExDslot()))

        insn_count++;

      else

        // Exception version

        if (accessor->getExceptFlushpipe())

          insn_count++;

    }

  // Check the instruction when the freeze signal is low.

  if ((!accessor->getWbFreeze()) && (accessor->getExceptType() == 0))

    {

      // Do something if we have l.nop

      switch (current_WbInsn)

        {

        case NOP_EXIT:

          r3 = accessor->getGpr (3);

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: Exiting (" << r3 << ")" << std::endl;

          perfSummary();

          if (logging_enabled) statusFile.close();

          if (profiling_enabled) profileFile.close();

          if (bus_trans_log_enabled) busTransLog.close();

          memdump();

          SIM_RUNNING=0;

          sc_stop();

          break;

        case NOP_REPORT:

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          r3 = accessor->getGpr (3);

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: report (" << hex << r3 << ")" << std::endl;

          break;

        case NOP_PRINTF:

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: printf" << std::endl;

          break;

        case NOP_PUTC:

          r3 = accessor->getGpr (3);

          std::cout << (char)r3 << std::flush;

          break;

        case NOP_CNT_RESET:

          std::cout << "****************** counters reset ******************" << endl;

          std::cout << "since last reset: cycles " << cycle_count - cycle_count_rst << ", insn #" << insn_count - insn_count_rst << endl;

          std::cout << "****************** counters reset ******************" << endl;

          cycle_count_rst = cycle_count;

          insn_count_rst = insn_count;

          /* 3 separate counters we'll use for various things */

        case NOP_CNT_RESET1:

          std::cout << "**** counter1 cycles: " << std::setfill('0') << std::setw(10) << cycle_count - cycles_1 << " resetting ********" << endl;

          cycles_1 = cycle_count;

          break;

        case NOP_CNT_RESET2:

          std::cout << "**** counter2 cycles: " << std::setfill('0') << std::setw(10) << cycle_count - cycles_2 << " resetting ********" << endl;

          cycles_2 = cycle_count;

          break;

        case NOP_CNT_RESET3:

          std::cout << "**** counter3 cycles: " << std::setfill('0') << std::setw(10) << cycle_count - cycles_3 << " resetting ********" << endl;

          cycles_3 = cycle_count;

          break;

        default:

          break;

        }

      if (monitor_for_crash)

        {

          current_WbPC = accessor->getWbPC();

          // Look at current instruction

          if (current_WbInsn == 0x00000000)

            {

              // Looks like we've jumped somewhere incorrectly

              lookslikewevecrashed_count++;

            }

#define CRASH_MONITOR_LOG_BAD_INSNS 1

#if CRASH_MONITOR_LOG_BAD_INSNS

          /* Log so-called "bad" instructions, or at least instructions we

          executed, no matter if they caused us to increment

          lookslikewevecrashed_count, this way we get them in our list too */

          if (((current_WbInsn & 0xfc000000) != (uint32_t) OR1200_OR32_NOP) || !(current_WbInsn & (1<<16)))

            {

              crash_monitor_buffer[crash_monitor_buffer_head][0] = current_WbPC;

              crash_monitor_buffer[crash_monitor_buffer_head][1] = current_WbInsn;

              /* Circular buffer */

              if(crash_monitor_buffer_head < CRASH_MONITOR_BUFFER_SIZE-1)

                crash_monitor_buffer_head++;

              else

                crash_monitor_buffer_head = 0;

            }

#else

          else if (((current_WbInsn & 0xfc000000) != (uint32_t) OR1200_OR32_NOP) || !(current_WbInsn & (1<<16)))

          {

              crash_monitor_buffer[crash_monitor_buffer_head][0] = current_WbPC;

              crash_monitor_buffer[crash_monitor_buffer_head][1] = current_WbInsn;

              /* Circular buffer */

              if(crash_monitor_buffer_head < CRASH_MONITOR_BUFFER_SIZE-1)

                crash_monitor_buffer_head++;

              else

                crash_monitor_buffer_head = 0;

              /* Reset this */

              lookslikewevecrashed_count  = 0;

            }

#endif    

          if (wait_for_stall_cmd_response)

            {

              // We've already crashed, and we're issued a command to stall the

              // processor to the system C debug unit interface, and we're

              // waiting for this debug unit to send back the message that we've

              // stalled.

              char readChar;

              int n = read(monitor_to_gdb_pipe[1][0], &readChar, sizeof(char));

              if (!( ((n < 0) && (errno == EAGAIN)) || (n==0) ))

                wait_for_stall_cmd_response = false; // We got response

              lookslikewevecrashed_count = 0;

            }

          else if (lookslikewevecrashed_count > 0)

            {

              if (lookslikewevecrashed_count >= CRASH_MONITOR_BUFFER_SIZE/4)

                {

                  /* Probably crashed. Bail out, print out buffer */

                  std::cout << "********************************************************************************"<< endl;

                  std::cout << "* Looks like processor crashed. Printing last " << CRASH_MONITOR_BUFFER_SIZE << " instructions executed:" << endl;

                  int crash_monitor_buffer_head_end = (crash_monitor_buffer_head > 0) ? crash_monitor_buffer_head - 1 : CRASH_MONITOR_BUFFER_SIZE-1;

                  while (crash_monitor_buffer_head != crash_monitor_buffer_head_end)

                    {

                      std::cout << "* PC: " << std::setfill('0') << hex << std::setw(8) << crash_monitor_buffer[crash_monitor_buffer_head][0] << "  INSN: " << std::setfill('0') << hex << std::setw(8) << crash_monitor_buffer[crash_monitor_buffer_head][1] << endl;

                      if(crash_monitor_buffer_head < CRASH_MONITOR_BUFFER_SIZE-1)

                        crash_monitor_buffer_head++;

                      else

                        crash_monitor_buffer_head = 0;

                    }

                  std::cout << "********************************************************************************"<< endl;

                  if ( (monitor_to_gdb_pipe[0][0] != NULL))

                    {

                      // If GDB server is running, we'll pass control back to

                      // the debugger instead of just quitting.

                      char interrupt = 0x3; // Arbitrary

                      write(monitor_to_gdb_pipe[0][1],&interrupt,sizeof(char));

                      wait_for_stall_cmd_response = true;

                      lookslikewevecrashed_count = 0;

                      std::cout << "* Stalling processor and returning control to GDB"<< endl;

                      // Problem: the debug unit interface's stalling the processor over the simulated JTAG bus takes a while, in the meantime this monitor will continue running and keep triggering the crash detection code. We must somehow wait until the processor is stalled, or circumvent this crash detection output until we detect that the processor is stalled.

                      // Solution: Added another pipe, when we want to wait for preocssor to stall, we set wait_for_stall_cmd_response=true, then each time we get back to this monitor function we simply poll the pipe until we're stalled. (A blocking read didn't work - this function never yielded and the RSP server handling function never got called).

                      wait_for_stall_cmd_response = true;

                    }

                  else

                    {

                      // Close down sim end exit

                      ts = sc_time_stamp().to_seconds() * 1000000000.0;

                      std::cout << std::fixed << std::setprecision (2) << ts;

                      std::cout << " ns: Exiting (" << r3 << ")" << std::endl;

                      perfSummary();

                      if (logging_enabled) statusFile.close();

                      if (profiling_enabled) profileFile.close();

                      if (bus_trans_log_enabled) busTransLog.close();

                      memdump();

                      SIM_RUNNING=0;

                      sc_stop();

                    }

                }

            }

        }

    }

}       // checkInstruction()

//! Method to log execution in terms of calls and returns

void

Or1200MonitorSC::callLog()

{

  uint32_t  exinsn, delaypc;

  uint32_t o_a; // operand a

  uint32_t o_b; // operand b

  struct label_entry *tmp;

  // Instructions should be valid when freeze is low and there are no exceptions

  //if (!accessor->getExFreeze())

  if ((!accessor->getWbFreeze()) && (accessor->getExceptType() == 0))

    {

      //exinsn = accessor->getExInsn();// & 0x3ffffff;

      exinsn = accessor->getWbInsn();

      // Check the instruction

      switch((exinsn >> 26) & 0x3f) { // Check Opcode - top 6 bits

      case 0x1:

        /* Instruction: l.jal */

        o_a = (exinsn >> 0) & 0x3ffffff;

        if(o_a & 0x02000000) o_a |= 0xfe000000;