src/target/oocd_trace.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "arm.h"
  25 #include "etm.h"
  26 #include "oocd_trace.h"
  27
  28 /*
  29  * This is "proof of concept" code, for prototype hardware:
  30  * https://lists.berlios.de/pipermail/openocd-development/2007-September/000336.html
  31  */
  32
  33
  34 static int oocd_trace_read_reg(struct oocd_trace *oocd_trace, int reg, uint32_t *value)
  35 {
  36         size_t bytes_written, bytes_read, bytes_to_read;
  37         uint8_t cmd;
  38
  39         cmd = 0x10 | (reg & 0x7);
  40         bytes_written = write(oocd_trace->tty_fd, &cmd, 1);
  41
  42         bytes_to_read = 4;
  43         while (bytes_to_read > 0)
  44         {
  45                 bytes_read = read(oocd_trace->tty_fd, ((uint8_t*)value) + 4 - bytes_to_read, bytes_to_read);
  46                 bytes_to_read -= bytes_read;
  47         }
  48
  49         LOG_DEBUG("reg #%i: 0x%8.8x", reg, *value);
  50
  51         return ERROR_OK;
  52 }
  53
  54 static int oocd_trace_write_reg(struct oocd_trace *oocd_trace, int reg, uint32_t value)
  55 {
  56         size_t bytes_written;
  57         uint8_t data[5];
  58
  59         data[0] = 0x18 | (reg & 0x7);
  60         data[1] = value & 0xff;
  61         data[2] = (value & 0xff00) >> 8;
  62         data[3] = (value & 0xff0000) >> 16;
  63         data[4] = (value & 0xff000000) >> 24;
  64
  65         bytes_written = write(oocd_trace->tty_fd, data, 5);
  66         LOG_DEBUG("reg #%i: 0x%8.8x", reg, value);
  67
  68         return ERROR_OK;
  69 }
  70
  71 static int oocd_trace_read_memory(struct oocd_trace *oocd_trace, uint8_t *data, uint32_t address, uint32_t size)
  72 {
  73         size_t bytes_written, bytes_to_read;
  74         ssize_t bytes_read;
  75         uint8_t cmd;
  76
  77         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_ADDRESS, address);
  78         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_SDRAM_COUNTER, size);
  79
  80         cmd = 0x20;
  81         bytes_written = write(oocd_trace->tty_fd, &cmd, 1);
  82
  83         bytes_to_read = size * 16;
  84         while (bytes_to_read > 0)
  85         {
  86                 if ((bytes_read = read(oocd_trace->tty_fd,
  87                                 ((uint8_t*)data) + (size * 16) - bytes_to_read, bytes_to_read)) < 0)
  88                 {
  89                         LOG_DEBUG("read() returned %zi (%s)", bytes_read, strerror(errno));
  90                 }
  91                 else
  92                         bytes_to_read -= bytes_read;
  93         }
  94
  95         return ERROR_OK;
  96 }
  97
  98 static int oocd_trace_init(struct etm_context *etm_ctx)
  99 {
 100         uint8_t trash[256];
 101         struct oocd_trace *oocd_trace = etm_ctx->capture_driver_priv;
 102         size_t bytes_read;
 103
 104         oocd_trace->tty_fd = open(oocd_trace->tty, O_RDWR | O_NOCTTY | O_NONBLOCK);
 105
 106         if (oocd_trace->tty_fd < 0)
 107         {
 108                 LOG_ERROR("can't open tty");
 109                 return ERROR_ETM_CAPTURE_INIT_FAILED;
 110         }
 111
 112         /* clear input & output buffers, then switch to "blocking mode" */
 113         tcflush(oocd_trace->tty_fd, TCOFLUSH);
 114         tcflush(oocd_trace->tty_fd, TCIFLUSH);
 115         fcntl(oocd_trace->tty_fd, F_SETFL, fcntl(oocd_trace->tty_fd, F_GETFL) & ~O_NONBLOCK);
 116
 117         tcgetattr(oocd_trace->tty_fd, &oocd_trace->oldtio); /* save current port settings */
 118
 119         bzero(&oocd_trace->newtio, sizeof(oocd_trace->newtio));
 120         oocd_trace->newtio.c_cflag = CS8 | CLOCAL | CREAD | B2500000;
 121
 122         oocd_trace->newtio.c_iflag = IGNPAR | IGNBRK | IXON | IXOFF;
 123         oocd_trace->newtio.c_oflag = 0;
 124
 125         /* set input mode (non-canonical, no echo,...) */
 126         oocd_trace->newtio.c_lflag = 0;
 127
 128         cfmakeraw(&oocd_trace->newtio);
 129         oocd_trace->newtio.c_cc[VTIME] = 1;   /* inter-character timer used */
 130         oocd_trace->newtio.c_cc[VMIN] = 0;   /* blocking read until 0 chars received */
 131
 132         tcflush(oocd_trace->tty_fd, TCIFLUSH);
 133         tcsetattr(oocd_trace->tty_fd, TCSANOW, &oocd_trace->newtio);
 134
 135         /* occasionally one bogus character is left in the input buffer
 136          * read up any leftover characters to ensure communication is in sync */
 137         while ((bytes_read = read(oocd_trace->tty_fd, trash, sizeof(trash))) > 0)
 138         {
 139                 LOG_DEBUG("%zi bytes read", bytes_read);
 140         };
 141
 142         return ERROR_OK;
 143 }
 144
 145 static trace_status_t oocd_trace_status(struct etm_context *etm_ctx)
 146 {
 147         struct oocd_trace *oocd_trace = etm_ctx->capture_driver_priv;
 148         uint32_t status;
 149
 150         oocd_trace_read_reg(oocd_trace, OOCD_TRACE_STATUS, &status);
 151
 152         /* if tracing is currently idle, return this information */
 153         if (etm_ctx->capture_status == TRACE_IDLE)
 154         {
 155                 return etm_ctx->capture_status;
 156         }
 157         else if (etm_ctx->capture_status & TRACE_RUNNING)
 158         {
 159                 /* check Full bit to identify an overflow */
 160                 if (status & 0x4)
 161                         etm_ctx->capture_status |= TRACE_OVERFLOWED;
 162
 163                 /* check Triggered bit to identify trigger condition */
 164                 if (status & 0x2)
 165                         etm_ctx->capture_status |= TRACE_TRIGGERED;
 166
 167                 if (status & 0x1)
 168                 {
 169                         etm_ctx->capture_status &= ~TRACE_RUNNING;
 170                         etm_ctx->capture_status |= TRACE_COMPLETED;
 171                 }
 172         }
 173
 174         return etm_ctx->capture_status;
 175 }
 176
 177 static int oocd_trace_read_trace(struct etm_context *etm_ctx)
 178 {
 179         struct oocd_trace *oocd_trace = etm_ctx->capture_driver_priv;
 180         uint32_t status, address;
 181         uint32_t first_frame = 0x0;
 182         uint32_t num_frames = 1048576;
 183         uint8_t *trace_data;
 184         uint32_t i;
 185
 186         oocd_trace_read_reg(oocd_trace, OOCD_TRACE_STATUS, &status);
 187         oocd_trace_read_reg(oocd_trace, OOCD_TRACE_ADDRESS, &address);
 188
 189         /* check if we overflowed, and adjust first frame of the trace accordingly
 190          * if we didn't overflow, read only up to the frame that would be written next,
 191          * i.e. don't read invalid entries
 192          */
 193         if (status & 0x4)
 194                 first_frame = address;
 195         else
 196                 num_frames = address;
 197
 198         /* read data into temporary array for unpacking
 199          * one frame from OpenOCD + trace corresponds to 16 trace cycles
 200          */
 201         trace_data = malloc(sizeof(uint8_t) * num_frames * 16);
 202         oocd_trace_read_memory(oocd_trace, trace_data, first_frame, num_frames);
 203
 204         if (etm_ctx->trace_depth > 0)
 205         {
 206                 free(etm_ctx->trace_data);
 207         }
 208
 209         etm_ctx->trace_depth = num_frames * 16;
 210         etm_ctx->trace_data = malloc(sizeof(struct etmv1_trace_data) * etm_ctx->trace_depth);
 211
 212         for (i = 0; i < num_frames * 16; i++)
 213         {
 214                 etm_ctx->trace_data[i].pipestat = (trace_data[i] & 0x7);
 215                 etm_ctx->trace_data[i].packet = (trace_data[i] & 0x78) >> 3;
 216                 etm_ctx->trace_data[i].flags = 0;
 217
 218                 if ((trace_data[i] & 0x80) >> 7)
 219                 {
 220                         etm_ctx->trace_data[i].flags |= ETMV1_TRACESYNC_CYCLE;
 221                 }
 222
 223                 if (etm_ctx->trace_data[i].pipestat == STAT_TR)
 224                 {
 225                         etm_ctx->trace_data[i].pipestat = etm_ctx->trace_data[i].packet & 0x7;
 226                         etm_ctx->trace_data[i].flags |= ETMV1_TRIGGER_CYCLE;
 227                 }
 228         }
 229
 230         free(trace_data);
 231
 232         return ERROR_OK;
 233 }
 234
 235 static int oocd_trace_start_capture(struct etm_context *etm_ctx)
 236 {
 237         struct oocd_trace *oocd_trace = etm_ctx->capture_driver_priv;
 238         uint32_t control = 0x1; /* 0x1: enabled */
 239         uint32_t trigger_count;
 240
 241         if (((etm_ctx->control & ETM_PORT_MODE_MASK) != ETM_PORT_NORMAL)
 242                 || ((etm_ctx->control & ETM_PORT_WIDTH_MASK) != ETM_PORT_4BIT))
 243         {
 244                 LOG_DEBUG("OpenOCD + trace only supports normal 4-bit ETM mode");
 245                 return ERROR_ETM_PORTMODE_NOT_SUPPORTED;
 246         }
 247
 248         if ((etm_ctx->control & ETM_PORT_CLOCK_MASK) == ETM_PORT_HALF_CLOCK)
 249         {
 250                 control |= 0x2; /* half rate clock, capture at twice the clock rate */
 251         }
 252
 253         /* OpenOCD + trace holds up to 16 million samples,
 254          * but trigger counts is set in multiples of 16 */
 255         trigger_count = (1048576 * /* trigger_percent */ 50) / 100;
 256
 257         /* capturing always starts at address zero */
 258         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_ADDRESS, 0x0);
 259         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_TRIGGER_COUNTER, trigger_count);
 260         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_CONTROL, control);
 261
 262         /* we're starting a new trace, initialize capture status */
 263         etm_ctx->capture_status = TRACE_RUNNING;
 264
 265         return ERROR_OK;
 266 }
 267
 268 static int oocd_trace_stop_capture(struct etm_context *etm_ctx)
 269 {
 270         struct oocd_trace *oocd_trace = etm_ctx->capture_driver_priv;
 271
 272         /* trace stopped, just clear running flag, but preserve others */
 273         etm_ctx->capture_status &= ~TRACE_RUNNING;
 274
 275         oocd_trace_write_reg(oocd_trace, OOCD_TRACE_CONTROL, 0x0);
 276
 277         return ERROR_OK;
 278 }
 279
 280 COMMAND_HANDLER(handle_oocd_trace_config_command)
 281 {
 282         struct target *target;
 283         struct arm *arm;
 284
 285         if (CMD_ARGC != 2)
 286         {
 287                 return ERROR_COMMAND_SYNTAX_ERROR;
 288         }
 289
 290         target = get_current_target(CMD_CTX);
 291         arm = target_to_arm(target);
 292         if (!is_arm(arm))
 293         {
 294                 command_print(CMD_CTX, "current target isn't an ARM");
 295                 return ERROR_FAIL;
 296         }
 297
 298         if (arm->etm)
 299         {
 300                 struct oocd_trace *oocd_trace = malloc(sizeof(struct oocd_trace));
 301
 302                 arm->etm->capture_driver_priv = oocd_trace;
 303                 oocd_trace->etm_ctx = arm->etm;
 304
 305                 /* copy name of TTY device used to communicate with OpenOCD + trace */
 306                 oocd_trace->tty = strndup(CMD_ARGV[1], 256);
 307         }
 308         else
 309         {
 310                 LOG_ERROR("target has no ETM defined, OpenOCD + trace left unconfigured");
 311         }
 312
 313         return ERROR_OK;
 314 }
 315
 316 COMMAND_HANDLER(handle_oocd_trace_status_command)
 317 {
 318         struct target *target;
 319         struct arm *arm;
 320         struct oocd_trace *oocd_trace;
 321         uint32_t status;
 322
 323         target = get_current_target(CMD_CTX);
 324
 325         arm = target_to_arm(target);
 326         if (!is_arm(arm))
 327         {
 328                 command_print(CMD_CTX, "current target isn't an ARM");
 329                 return ERROR_FAIL;
 330         }
 331
 332         if (!arm->etm)
 333         {
 334                 command_print(CMD_CTX, "current target doesn't have an ETM configured");
 335                 return ERROR_FAIL;
 336         }
 337
 338         if (strcmp(arm->etm->capture_driver->name, "oocd_trace") != 0)
 339         {
 340                 command_print(CMD_CTX, "current target's ETM capture driver isn't 'oocd_trace'");
 341                 return ERROR_FAIL;
 342         }
 343
 344         oocd_trace = (struct oocd_trace*)arm->etm->capture_driver_priv;
 345
 346         oocd_trace_read_reg(oocd_trace, OOCD_TRACE_STATUS, &status);
 347
 348         if (status & 0x8)
 349                 command_print(CMD_CTX, "trace clock locked");
 350         else
 351                 command_print(CMD_CTX, "no trace clock");
 352
 353         return ERROR_OK;
 354 }
 355
 356 COMMAND_HANDLER(handle_oocd_trace_resync_command)
 357 {
 358         struct target *target;
 359         struct arm *arm;
 360         struct oocd_trace *oocd_trace;
 361         size_t bytes_written;
 362         uint8_t cmd_array[1];
 363
 364         target = get_current_target(CMD_CTX);
 365
 366         arm = target_to_arm(target);
 367         if (!is_arm(arm))
 368         {
 369                 command_print(CMD_CTX, "current target isn't an ARM");
 370                 return ERROR_FAIL;
 371         }
 372
 373         if (!arm->etm)
 374         {
 375                 command_print(CMD_CTX, "current target doesn't have an ETM configured");
 376                 return ERROR_FAIL;
 377         }
 378
 379         if (strcmp(arm->etm->capture_driver->name, "oocd_trace") != 0)
 380         {
 381                 command_print(CMD_CTX, "current target's ETM capture driver isn't 'oocd_trace'");
 382                 return ERROR_FAIL;
 383         }
 384
 385         oocd_trace = (struct oocd_trace*)arm->etm->capture_driver_priv;
 386
 387         cmd_array[0] = 0xf0;
 388
 389         bytes_written = write(oocd_trace->tty_fd, cmd_array, 1);
 390
 391         command_print(CMD_CTX, "requesting traceclock resync");
 392         LOG_DEBUG("resyncing traceclk pll");
 393
 394         return ERROR_OK;
 395 }
 396
 397 static const struct command_registration oocd_trace_all_command_handlers[] = {
 398         {
 399                 .name = "config",
 400                 .handler = handle_oocd_trace_config_command,
 401                 .mode = COMMAND_CONFIG,
 402                 .usage = "<target> <tty>",
 403         },
 404         {
 405                 .name = "status",
 406                 .handler = handle_oocd_trace_status_command,
 407                 .mode = COMMAND_EXEC,
 408                 .usage = "",
 409                 .help = "display OpenOCD + trace status",
 410         },
 411         {
 412                 .name = "resync",
 413                 .handler = handle_oocd_trace_resync_command,
 414                 .mode = COMMAND_EXEC,
 415                 .usage = "",
 416                 .help = "resync OpenOCD + trace capture clock",
 417         },
 418         COMMAND_REGISTRATION_DONE
 419 };
 420 static const struct command_registration oocd_trace_command_handlers[] = {
 421         {
 422                 .name = "oocd_trace",
 423                 .mode = COMMAND_ANY,
 424                 .help = "OpenOCD trace capture driver command group",
 425                 .usage = "",
 426                 .chain = oocd_trace_all_command_handlers,
 427         },
 428         COMMAND_REGISTRATION_DONE
 429 };
 430
 431 struct etm_capture_driver oocd_trace_capture_driver =
 432 {
 433         .name = "oocd_trace",
 434         .commands = oocd_trace_command_handlers,
 435         .init = oocd_trace_init,
 436         .status = oocd_trace_status,
 437         .start_capture = oocd_trace_start_capture,
 438         .stop_capture = oocd_trace_stop_capture,
 439         .read_trace = oocd_trace_read_trace,
 440 };
 441
 442