Subversion Repositories adv_debug_sys

/* adv_jtag_bridge.c -- JTAG protocol bridge between GDB and Advanced debug module.

   Copyright(C) 2001 Marko Mlinar, markom@opencores.org

   Code for TCP/IP copied from gdb, by Chris Ziomkowski

   Refactoring by Nathan Yawn, nyawn@opencores.org

   This file was part of the OpenRISC 1000 Architectural Simulator.

   It is now also used to connect GDB to a running hardware OpenCores / OR1200

   advanced debug unit.

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

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 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 General Public License for more details.

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

   along with this program; if not, write to the Free Software

   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* Establishes jtag proxy server and communicates with parallel

   port directly.  Requires root access. */

#include <stdio.h>

#include <stdlib.h>  // for exit(), atoi(), strtoul()

#include <unistd.h>

#include <stdarg.h>

#include <string.h>  // for strstr()

#include <sys/types.h>

#include "adv_jtag_bridge.h"

#include "rsp-server.h"

#include "chain_commands.h"

#include "cable_common.h"

#include "or32_selftest.h"

#include "bsdl.h"

#include "errcodes.h"

#define debug(...) //fprintf(stderr, __VA_ARGS__ )

// How many command-line IR length settings to create by default

#define IR_START_SETS 16

//////////////////////////////////////////////////

// Command line option flags / values

/* Which device in the scan chain we want to target.

 * 0 is the first device we find, which is nearest the data input of the cable.

 */

unsigned int target_dev_pos = 0;

// Do test before setting up server?

unsigned char do_selftest = 0;

// IR register length in TAP of 

// Can override autoprobe, or set if IDCODE not supported

typedef struct {

  int dev_index;

  int ir_length;

} irset;

#define START_IR_SETS 16

int reallocs = 0;

int num_ir_sets = 0;

irset * cmd_line_ir_sizes = NULL;

// DEBUG command for target device TAP

// May actually be USER1, for Xilinx devices using internal BSCAN modules

// Can override autoprobe, or set if unable to find in BSDL files

int cmd_line_cmd_debug = -1;  // 0 is a valid debug command, so use -1

// TCP port to set up the server for GDB on

char *port;

char default_port[] = "9999";

// Force altera virtual jtag mode on(1) or off(-1)

int force_alt_vjtag = 0;

// Pointer to the command line arg used as the cable name

char * cable_name = NULL;

////////////////////////////////////////////////////////

// List of IDCODES of devices on the JTAG scan chain

// The array is dynamically allocated in chain_commands/jtag_enumerate_chain()

uint32_t *idcodes = NULL;

int num_devices = 0;

const char *name_not_found = "(unknown)";

///////////////////////////////////////////////////////////

// JTAG constants

// Defines for Altera JTAG constants

#define ALTERA_MANUFACTURER_ID   0x6E

// Defines for Xilinx JTAG constants

#define XILINX_MANUFACTURER_ID   0x49

///////////////////////////////////////////////////

// Prototypes for local / helper functions

int get_IR_size(int devidx);

uint32_t get_debug_cmd(int devidx);

void configure_chain(void);

void print_usage(char *func);

void parse_args(int argc, char **argv);

void get_ir_opts(char *optstr, int *idx, int *val);

//////////////////////////////////////////////////////////////////////////////////////

/*----------------------------------------------------------------------------------*/

// Functions

/////////////////////////////////////////////////////////////////////////////////////

// Resets JTAG, and sets up DEBUG scan chain

void configure_chain(void)

{

  int i;

  unsigned int manuf_id;

  uint32_t cmd;

  const char *name;

  int irlen;

  int err = APP_ERR_NONE;

  err |= tap_reset();

  err |= jtag_enumerate_chain(&idcodes, &num_devices);

  if(err != APP_ERR_NONE) {

    printf("Error %s enumerating JTAG chain, aborting.\n", get_err_string(err));

    exit(1);

  }

  printf("\nDevices on JTAG chain:\n");

  printf("Index\tName\t\tID Code\t\tIR Length\n");

  printf("----------------------------------------------------------------\n");

  for(i = 0; i < num_devices; i++)

    {

      if(idcodes[i] != IDCODE_INVALID) {

        name = bsdl_get_name(idcodes[i]);

        irlen = bsdl_get_IR_size(idcodes[i]);

        if(name == NULL)

          name = name_not_found;

      } else {

        name = name_not_found;

        irlen = -1;

      }

      printf("%d: \t%s \t0x%08lX \t%d\n", i, name, idcodes[i], irlen);

    }

  printf("\n");

  if(target_dev_pos >= num_devices) {

    printf("ERROR:  Requested target device (%i) beyond highest device index (%i).\n", target_dev_pos, num_devices-1);

    exit(1);

  } else {

    printf("Target device %i, JTAG ID = 0x%08lx\n", target_dev_pos, idcodes[target_dev_pos]);

  }

  manuf_id = (idcodes[target_dev_pos] >> 1) & 0x7FF;

  // Use BSDL files to determine prefix bits, postfix bits, debug command, IR length

  config_set_IR_size(get_IR_size(target_dev_pos));

  // Set the IR prefix / postfix bits

  int total = 0;

  for(i = 0; i < num_devices; i++) {

    if(i == target_dev_pos) {

      config_set_IR_postfix_bits(total);

      //debug("Postfix bits: %d\n", total);

      total = 0;

      continue;

    }

    total += get_IR_size(i);

    debug("Adding %i to total for devidx %i\n", get_IR_size(i), i);

  }

  config_set_IR_prefix_bits(total);

  debug("Prefix bits: %d\n", total);

  // Note that there's a little translation here, since device index 0 is actually closest to the cable data input

  config_set_DR_prefix_bits(num_devices - target_dev_pos - 1);  // number of devices between cable data out and target device

  config_set_DR_postfix_bits(target_dev_pos);  // number of devices between target device and cable data in

  // Set the DEBUG command for the IR of the target device.

  // If this is a Xilinx device, use USER1 instead of DEBUG

  // If we Altera Virtual JTAG mode, we don't care.

  if((force_alt_vjtag == -1) || ((force_alt_vjtag == 0) &&  (manuf_id != ALTERA_MANUFACTURER_ID))) {

    cmd = get_debug_cmd(target_dev_pos);

    if(cmd == TAP_CMD_INVALID) {

      printf("Unable to find DEBUG command, aborting.\n");

      exit(1);

    }

    config_set_debug_cmd(cmd);  // This may have to be USER1 if this is a Xilinx device   

  }

  // Enable the kludge for Xilinx BSCAN, if necessary.

  // Safe, but slower, for non-BSCAN TAPs.

  if(manuf_id == XILINX_MANUFACTURER_ID) {

    config_set_xilinx_bscan(1);

  }

  // Set Altera Virtual JTAG mode on or off.  If not forced, then enable

  // if the target device has an Altera manufacturer IDCODE

  if(force_alt_vjtag == 1) {

    config_set_alt_vjtag(1);

  } else if(force_alt_vjtag == -1) {

    config_set_alt_vjtag(0);

  } else {

    if(manuf_id == ALTERA_MANUFACTURER_ID) {

      config_set_alt_vjtag(1);

    } else {

      config_set_alt_vjtag(0);

    }

  }

  // Do a sanity test

  cmd = bsdl_get_idcode_cmd(idcodes[target_dev_pos]);

  if(cmd != TAP_CMD_INVALID) {

       uint32_t id_read;

       err |= jtag_get_idcode(cmd, &id_read);

       if(err != APP_ERR_NONE) {

         printf("Error %s checking IDCODE, aborting.\n", get_err_string(err));

         exit(1);

       }

       if(id_read == idcodes[target_dev_pos]) {

         printf("IDCODE sanity test passed, chain OK!\n");

       } else {

         printf("Warning: IDCODE sanity test failed.  Read IDCODE 0x%08lX, expected 0x%08lX\n", id_read, idcodes[target_dev_pos]);

       }

     }

  if(err |= tap_enable_debug_module()) {  // Select the debug unit in the TAP.

    printf("Error %s enabling debug module, aborting.\n", get_err_string(err));

    exit(1);

  }

}

void print_usage(char *func)

{

  printf("JTAG connection between GDB and the Advanced Debug Interface.\n");

  printf("Copyright (C) 2008 Nathan Yawn, nathan.yawn@opencores.org\n\n");

  printf("Usage: %s (options) [cable] (cable options)\n", func);

  printf("Options:\n");

  printf("\t-g [port]     : port number for GDB (default: 9999)\n");

  printf("\t-x [index]    : Position of the target device in the scan chain\n");

  printf("\t-a [0 / 1]    : force Altera virtual JTAG mode off (0) or on (1)\n");

  printf("\t-l [<index>:<bits>]     : Specify length of IR register for device\n");

  printf("\t                <index>, override autodetect (if any)\n");

  printf("\t-c [hex cmd]  : Debug command for target TAP, override autodetect\n");

  printf("\t                (ignored for Altera targets)\n");

  printf("\t-v [hex cmd]  : VIR command for target TAP, override autodetect\n");

  printf("\t                (Altera virtual JTAG targets only)\n");

  printf("\t-r [hex cmd]  : VDR for target TAP, override autodetect\n");

  printf("\t                (Altera virtual JTAG targets only)\n");

  printf("\t-b [dirname]  : Add a directory to search for BSDL files\n");

  printf("\t-t            : perform CPU / memory self-test before starting server\n");

  printf("\t-h            : show help\n\n");

  cable_print_help();

}

void parse_args(int argc, char **argv)

{

  int c;

  int i;

  int idx, val;

  const char *valid_cable_args = NULL;

  port = NULL;

  force_alt_vjtag = 0;

  cmd_line_cmd_debug = -1;

  /* Parse the global arguments (if-any) */

  while((c = getopt(argc, argv, "+g:x:a:l:c:v:r:b:th")) != -1) {

    switch(c) {

    case 'h':

      print_usage(argv[0]);

      exit(0);

      break;

    case 'g':

      port = optarg;

      break;

    case 'x':

      target_dev_pos = atoi(optarg);

      break;

    case 'l':

      get_ir_opts(optarg, &idx, &val);        // parse the option

      if(num_ir_sets >= (IR_START_SETS<<reallocs)) {

        cmd_line_ir_sizes = (irset *) realloc(cmd_line_ir_sizes, (IR_START_SETS<<reallocs)*sizeof(irset));

        if(cmd_line_ir_sizes == NULL) {

          printf("Error: out of memory while parsing command line.  Aborting.\n");

          exit(1);

        }

      }

      cmd_line_ir_sizes[num_ir_sets].dev_index = idx;

      cmd_line_ir_sizes[num_ir_sets].ir_length = val;

      num_ir_sets++;

      break;

    case 'c':

      cmd_line_cmd_debug = strtoul(optarg, NULL, 16);

      break;

    case 'v':

      config_set_vjtag_cmd_vir(strtoul(optarg, NULL, 16));

      break;

    case 'r':

      config_set_vjtag_cmd_vdr(strtoul(optarg, NULL, 16));

      break;

    case 't':

      do_selftest = 1;

      break;

     case 'a':

       if(atoi(optarg) == 1)

        force_alt_vjtag = 1;

       else

        force_alt_vjtag = -1;

       break;

    case 'b':

       bsdl_add_directory(optarg);

      break;

    default:

      print_usage(argv[0]);

      exit(1);

    }

  }

  if(port == NULL)

    port = default_port;

  int found_cable = 0;

  char* start_str = argv[optind];

  int start_idx = optind;

  for(i = optind; i < argc; i++) {

    if(cable_select(argv[i]) == APP_ERR_NONE) {

      found_cable = 1;

      cable_name = argv[i];

      argv[optind] = argv[start_idx];  // swap the cable name with the other arg,

      argv[start_idx] = start_str;     // keep all cable opts at the end

      break;

    }

  }

  if(!found_cable) {

    fprintf(stderr, "No valid cable specified.\n");

    exit(1);

  }

  optind = start_idx+1;  // reset the parse index

    /* Get the cable-arguments */

  valid_cable_args = cable_get_args();

  /* Parse the remaining options for the cable.

   * Note that this will include unrecognized option from before the cable name.

   */

  while((c = getopt(argc, argv, valid_cable_args)) != -1) {

    //printf("Got cable opt %c (0x%X)\n", (char)c, c);

    if(c == '?') {

      printf("\nERROR:  Unknown cable option \'-%c\'\n\n", optopt);

      print_usage(argv[0]);

      exit(1);

    }

    else if(cable_parse_opt(c, optarg) != APP_ERR_NONE) {

      printf("\nERROR:  Failed to parse cable option \'-%c\' %s\n\n", (char)c, optarg);

      print_usage(argv[0]);

      exit(1);

    }

  }

}

int main(int argc,  char *argv[]) {

  char *s;

  long int serverPort;

  srand(getpid());

  bsdl_init();

  cmd_line_ir_sizes = (irset *) malloc(IR_START_SETS * sizeof(irset));

  if(cmd_line_ir_sizes == NULL) {

    printf("ERROR: out of memory allocating array for IR sizes.\n");

    return 1;

  }

  parse_args(argc, argv);

  if(cable_init() != APP_ERR_NONE) {

    printf("Failed to initialize cable \'%s\', aborting.\n", cable_name);

    exit(1);

  }

  /* Initialize a new connection to the or1k board, and make sure we are

     really connected.  */

  configure_chain();

  if(do_selftest) {

    // Test the connection.

    printf("*** Doing self-test ***\n");

    if(dbg_test() != APP_ERR_NONE) {

      printf("Self-test FAILED *** Bailing out!\n");

      exit(1);

    }

    printf("*** Self-test PASSED ***\n");

  }

  /* We have a connection.  Establish server.  */

  serverPort = strtol(port,&s,10);

  if(*s) return -1;

  rsp_init(serverPort);

  printf("JTAG bridge ready!\n");

  // This handles requests from GDB.  I'd prefer the while() loop to be in the function

  // with the select()/poll(), but the or1ksim rsp code (ported for use here) doesn't work 

  // that way, and I don't want to rework that code (to make it easier to import fixes

  // written for the or1ksim rsp server).  --NAY

  while(handle_rsp());

  return 0;

}

//////////////////////////////////////////////////

// Helper functions

int get_IR_size(int devidx)

{

  int retval = -1;

  int i;

  if(idcodes[devidx] != IDCODE_INVALID) {

    retval = bsdl_get_IR_size(idcodes[devidx]);

  }

  // Search for this devices in the array of command line IR sizes

  for(i = 0; i < num_ir_sets; i++) {

    if(cmd_line_ir_sizes[i].dev_index == devidx) {

      if((retval > 0) && (retval != cmd_line_ir_sizes[i].ir_length))

        printf("Warning: overriding autoprobed IR length (%i) with command line value (%i) for device %i\n", retval,

                            cmd_line_ir_sizes[i].ir_length, devidx);

      retval = cmd_line_ir_sizes[i].ir_length;

    }

  }

  if(retval < 0) {  // Make sure we have a value

    printf("ERROR! Unable to autoprobe IR length for device index %i;  Must set IR size on command line. Aborting.\n", devidx);

    exit(1);

  }

  return retval;

}

uint32_t get_debug_cmd(int devidx)

{

  int retval = TAP_CMD_INVALID;

  uint32_t manuf_id = (idcodes[devidx] >> 1) & 0x7FF;

  if(idcodes[devidx] != IDCODE_INVALID) {

    if(manuf_id == XILINX_MANUFACTURER_ID) {

      retval = bsdl_get_user1_cmd(idcodes[devidx]);

      if(cmd_line_cmd_debug < 0) printf("Xilinx IDCODE, assuming internal BSCAN mode\n\t(using USER1 instead of DEBUG TAP command)\n");

    } else {

      retval = bsdl_get_debug_cmd(idcodes[devidx]);

    }

  }

  if(cmd_line_cmd_debug >= 0) {

    if(retval != TAP_CMD_INVALID) {

      printf("Warning: overriding autoprobe debug command (0x%X) with command line value (0x%X)\n", retval, cmd_line_cmd_debug);

    } else {

      printf("Using command-line debug command 0x%X\n", cmd_line_cmd_debug);

    }

    retval = cmd_line_cmd_debug;

  }

  if(retval == TAP_CMD_INVALID) {

    printf("ERROR!  Unable to find DEBUG command for device index %i, device ID 0x%0lX\n", devidx, idcodes[devidx]);

  }

  return retval;

}

// Extracts two values from an option string

// of the form "<index>:<value>", where both args

// are in base 10

void get_ir_opts(char *optstr, int *idx, int *val)

{

  char *ptr;

  ptr = strstr(optstr, ":");

  if(ptr == NULL) {

    printf("Error: badly formatted IR length option.  Use format \'<index>:<value>\', without spaces, where both args are in base 10\n");

    exit(1);

  }

  *ptr = '\0';

  ptr++;  // This now points to the second (value) arg string

  *idx = strtoul(optstr, NULL, 10);

  *val = strtoul(ptr, NULL, 10);

  // ***CHECK FOR SUCCESS

}