git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

   1 /* -*- tab-width:8 -*- */
   2
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <signal.h>
  19
  20 #include <stlink-common.h>
  21
  22 #include "gdb-remote.h"
  23
  24 #define DEFAULT_LOGGING_LEVEL 100
  25 #define DEFAULT_GDB_LISTEN_PORT 4242
  26
  27 #define STRINGIFY_inner(name) #name
  28 #define STRINGIFY(name) STRINGIFY_inner(name)
  29
  30 #define FLASH_BASE 0x08000000
  31 #define FLASH_PAGE (sl->flash_pgsz)
  32 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  33 #define FLASH_SIZE (FLASH_PAGE * 128)
  34
  35 static const char hex[] = "0123456789abcdef";
  36
  37 static const char* current_memory_map = NULL;
  38
  39 /*
  40  * Chip IDs are explained in the appropriate programming manual for the
  41  * DBGMCU_IDCODE register (0xE0042000)
  42  */
  43
  44 #define CORE_M3_R1 0x1BA00477
  45 #define CORE_M3_R2 0x4BA00477
  46 #define CORE_M4_R0 0x2BA01477
  47
  48 typedef struct _st_state_t {
  49     // things from command line, bleh
  50     int stlink_version;
  51     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  52     char devicename[100];
  53     int logging_level;
  54         int listen_port;
  55 } st_state_t;
  56
  57
  58 int serve(stlink_t *sl, int port);
  59 char* make_memory_map(stlink_t *sl);
  60
  61
  62 int parse_options(int argc, char** argv, st_state_t *st) {
  63     static struct option long_options[] = {
  64         {"help", no_argument, NULL, 'h'},
  65         {"verbose", optional_argument, NULL, 'v'},
  66         {"device", required_argument, NULL, 'd'},
  67         {"stlink_version", required_argument, NULL, 's'},
  68         {"stlinkv1", no_argument, NULL, '1'},
  69                 {"listen_port", required_argument, NULL, 'p'},
  70         {0, 0, 0, 0},
  71     };
  72         const char * help_str = "%s - usage:\n\n"
  73         "  -h, --help\t\tPrint this help\n"
  74         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  75         "  -v, --verbose\tspecify generally verbose logging\n"
  76         "  -d <device>, --device=/dev/stlink2_1\n"
  77         "\t\t\tWhere is your stlink device connected?\n"
  78         "  -s X, --stlink_version=X\n"
  79         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  80         "  -1, --stlinkv1\tForce stlink version 1\n"
  81         "  -p 4242, --listen_port=1234\n"
  82         "\t\t\tSet the gdb server listen port. "
  83         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  84         ;
  85
  86
  87     int option_index = 0;
  88     int c;
  89     int q;
  90     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  91         switch (c) {
  92         case 0:
  93             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  94             printf("option %s", long_options[option_index].name);
  95             if (optarg) {
  96                 printf(" with arg %s", optarg);
  97             }
  98             printf("\n");
  99             break;
 100         case 'h':
 101             printf(help_str, argv[0]);
 102             exit(EXIT_SUCCESS);
 103             break;
 104         case 'v':
 105             if (optarg) {
 106                 st->logging_level = atoi(optarg);
 107             } else {
 108                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 109             }
 110             break;
 111         case 'd':
 112             if (strlen(optarg) > sizeof (st->devicename)) {
 113                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 114             } else {
 115                 strcpy(st->devicename, optarg);
 116             }
 117             break;
 118                 case '1':
 119                         st->stlink_version = 1;
 120                         break;
 121                 case 's':
 122                         sscanf(optarg, "%i", &q);
 123                         if (q < 0 || q > 2) {
 124                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 125                                 exit(EXIT_FAILURE);
 126                         }
 127                         st->stlink_version = q;
 128                         break;
 129                 case 'p':
 130                         sscanf(optarg, "%i", &q);
 131                         if (q < 0) {
 132                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 133                                 exit(EXIT_FAILURE);
 134                         }
 135                         st->listen_port = q;
 136                         break;
 137         }
 138     }
 139
 140     if (optind < argc) {
 141         printf("non-option ARGV-elements: ");
 142         while (optind < argc)
 143             printf("%s ", argv[optind++]);
 144         printf("\n");
 145     }
 146     return 0;
 147 }
 148
 149
 150 int main(int argc, char** argv) {
 151
 152         stlink_t *sl = NULL;
 153
 154         st_state_t state;
 155         memset(&state, 0, sizeof(state));
 156         // set defaults...
 157         state.stlink_version = 2;
 158         state.logging_level = DEFAULT_LOGGING_LEVEL;
 159         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 160         parse_options(argc, argv, &state);
 161         switch (state.stlink_version) {
 162         case 2:
 163                 sl = stlink_open_usb(state.logging_level);
 164                 if(sl == NULL) return 1;
 165                 break;
 166         case 1:
 167                 sl = stlink_v1_open(state.logging_level);
 168                 if(sl == NULL) return 1;
 169                 break;
 170     }
 171
 172     // ALLLL of this should move into "stlink_open_xxx"
 173
 174     if (stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE) {
 175         if (stlink_current_mode(sl) == STLINK_DEV_DFU_MODE) {
 176             stlink_exit_dfu_mode(sl);
 177         }
 178         stlink_enter_swd_mode(sl);
 179     }
 180
 181         uint32_t chip_id = stlink_chip_id(sl);
 182         uint32_t core_id = stlink_core_id(sl);
 183
 184         /* Fix chip_id for F4 */
 185         if (((chip_id & 0xFFF) == 0x411) && (core_id == CORE_M4_R0)) {
 186           printf("Fixing wrong chip_id for STM32F4 Rev A errata\n");
 187           chip_id = 0x413;
 188         }
 189
 190         printf("Chip ID is %08x, Core ID is  %08x.\n", chip_id, core_id);
 191
 192         current_memory_map = make_memory_map(sl);
 193
 194         while(serve(sl, state.listen_port) == 0);
 195
 196         /* Switch back to mass storage mode before closing. */
 197         stlink_run(sl);
 198         stlink_exit_debug_mode(sl);
 199         stlink_close(sl);
 200
 201         return 0;
 202 }
 203
 204 static const char* const memory_map_template =
 205   "<?xml version=\"1.0\"?>"
 206   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 207   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 208   "<memory-map>"
 209   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 210   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 211   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 212   "    <property name=\"blocksize\">0x%x</property>"
 213   "  </memory>"
 214   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 215   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 216   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 217   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 218   "</memory-map>";
 219
 220 char* make_memory_map(stlink_t *sl) {
 221         /* This will be freed in serve() */
 222         char* map = malloc(4096);
 223         map[0] = '\0';
 224
 225         snprintf(map, 4096, memory_map_template,
 226                         sl->flash_size,
 227                         sl->sram_size,
 228                         sl->flash_size, sl->flash_pgsz,
 229                         sl->sys_base, sl->sys_size);
 230
 231         return map;
 232 }
 233
 234
 235 /*
 236  * DWT_COMP0     0xE0001020
 237  * DWT_MASK0     0xE0001024
 238  * DWT_FUNCTION0 0xE0001028
 239  * DWT_COMP1     0xE0001030
 240  * DWT_MASK1     0xE0001034
 241  * DWT_FUNCTION1 0xE0001038
 242  * DWT_COMP2     0xE0001040
 243  * DWT_MASK2     0xE0001044
 244  * DWT_FUNCTION2 0xE0001048
 245  * DWT_COMP3     0xE0001050
 246  * DWT_MASK3     0xE0001054
 247  * DWT_FUNCTION3 0xE0001058
 248  */
 249
 250 #define DATA_WATCH_NUM 4
 251
 252 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 253
 254 struct code_hw_watchpoint {
 255         stm32_addr_t addr;
 256         uint8_t mask;
 257         enum watchfun fun;
 258 };
 259
 260 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 261
 262 static void init_data_watchpoints(stlink_t *sl) {
 263         #ifdef DEBUG
 264         printf("init watchpoints\n");
 265         #endif
 266
 267         // set trcena in debug command to turn on dwt unit
 268         stlink_read_mem32(sl, 0xE000EDFC, 4);
 269         sl->q_buf[3] |= 1;
 270         stlink_write_mem32(sl, 0xE000EDFC, 4);
 271
 272         // make sure all watchpoints are cleared
 273         memset(sl->q_buf, 0, 4);
 274         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 275                 data_watches[i].fun = WATCHDISABLED;
 276                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 277         }
 278 }
 279
 280 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 281 {
 282         int i = 0;
 283         uint32_t mask;
 284
 285         // computer mask
 286         // find a free watchpoint
 287         // configure
 288
 289         mask = -1;
 290         i = len;
 291         while(i) {
 292                 i >>= 1;
 293                 mask++;
 294         }
 295
 296         if((mask != -1) && (mask < 16)) {
 297                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 298                         // is this an empty slot ?
 299                         if(data_watches[i].fun == WATCHDISABLED) {
 300                                 #ifdef DEBUG
 301                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 302                                 #endif
 303
 304                                 data_watches[i].fun = wf;
 305                                 data_watches[i].addr = addr;
 306                                 data_watches[i].mask = mask;
 307
 308                                 // insert comparator address
 309                                 sl->q_buf[0] = (addr & 0xff);
 310                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 311                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 312                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 313
 314                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 315
 316                                 // insert mask
 317                                 memset(sl->q_buf, 0, 4);
 318                                 sl->q_buf[0] = mask;
 319                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 320
 321                                 // insert function
 322                                 memset(sl->q_buf, 0, 4);
 323                                 sl->q_buf[0] = wf;
 324                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 325
 326                                 // just to make sure the matched bit is clear !
 327                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 328                                 return 0;
 329                         }
 330                 }
 331         }
 332
 333         #ifdef DEBUG
 334         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 335         #endif
 336         return -1;
 337 }
 338
 339 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 340 {
 341         int i;
 342
 343         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 344                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 345                         #ifdef DEBUG
 346                         printf("delete watchpoint %d addr %x\n", i, addr);
 347                         #endif
 348
 349                         memset(sl->q_buf, 0, 4);
 350                         data_watches[i].fun = WATCHDISABLED;
 351                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 352
 353                         return 0;
 354                 }
 355         }
 356
 357         #ifdef DEBUG
 358         printf("failure: delete watchpoint addr %x\n", addr);
 359         #endif
 360
 361         return -1;
 362 }
 363
 364 #define CODE_BREAK_NUM  6
 365 #define CODE_BREAK_LOW  0x01
 366 #define CODE_BREAK_HIGH 0x02
 367
 368 struct code_hw_breakpoint {
 369         stm32_addr_t addr;
 370         int          type;
 371 };
 372
 373 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 374
 375 static void init_code_breakpoints(stlink_t *sl) {
 376         memset(sl->q_buf, 0, 4);
 377         sl->q_buf[0] = 0x03; // KEY | ENABLE
 378         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 379         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 380         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 381
 382         memset(sl->q_buf, 0, 4);
 383         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 384                 code_breaks[i].type = 0;
 385                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 386         }
 387 }
 388
 389 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 390         stm32_addr_t fpb_addr = addr & ~0x3;
 391         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 392
 393         if(addr & 1) {
 394                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 395                 return -1;
 396         }
 397
 398         int id = -1;
 399         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 400                 if(fpb_addr == code_breaks[i].addr ||
 401                         (set && code_breaks[i].type == 0)) {
 402                         id = i;
 403                         break;
 404                 }
 405         }
 406
 407         if(id == -1) {
 408                 if(set) return -1; // Free slot not found
 409                 else    return 0;  // Breakpoint is already removed
 410         }
 411
 412         struct code_hw_breakpoint* brk = &code_breaks[id];
 413
 414         brk->addr = fpb_addr;
 415
 416         if(set) brk->type |= type;
 417         else    brk->type &= ~type;
 418
 419         memset(sl->q_buf, 0, 4);
 420
 421         if(brk->type == 0) {
 422                 #ifdef DEBUG
 423                 printf("clearing hw break %d\n", id);
 424                 #endif
 425
 426                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 427         } else {
 428                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 429                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 430                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 431                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 432
 433                 #ifdef DEBUG
 434                 printf("setting hw break %d at %08x (%d)\n",
 435                         id, brk->addr, brk->type);
 436                 printf("reg %02x %02x %02x %02x\n",
 437                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 438                 #endif
 439
 440                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 441         }
 442
 443         return 0;
 444 }
 445
 446
 447 struct flash_block {
 448         stm32_addr_t addr;
 449         unsigned     length;
 450         uint8_t*     data;
 451
 452         struct flash_block* next;
 453 };
 454
 455 static struct flash_block* flash_root;
 456
 457 static int flash_add_block(stm32_addr_t addr, unsigned length,
 458                            stlink_t *sl) {
 459         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 460                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 461                 return -1;
 462         }
 463
 464         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 465                 fprintf(stderr, "flash_add_block: unaligned block\n");
 466                 return -1;
 467         }
 468
 469         struct flash_block* new = malloc(sizeof(struct flash_block));
 470         new->next = flash_root;
 471
 472         new->addr   = addr;
 473         new->length = length;
 474         new->data   = calloc(length, 1);
 475
 476         flash_root = new;
 477
 478         return 0;
 479 }
 480
 481 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 482         int fit_blocks = 0, fit_length = 0;
 483
 484         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 485                 /* Block: ------X------Y--------
 486                  * Data:            a-----b
 487                  *                a--b
 488                  *            a-----------b
 489                  * Block intersects with data, if:
 490                  *  a < Y && b > x
 491                  */
 492
 493                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 494                 unsigned a = addr, b = addr + length;
 495                 if(a < Y && b > X) {
 496                         // from start of the block
 497                         unsigned start = (a > X ? a : X) - X;
 498                         unsigned end   = (b > Y ? Y : b) - X;
 499
 500                         memcpy(fb->data + start, data, end - start);
 501
 502                         fit_blocks++;
 503                         fit_length += end - start;
 504                 }
 505         }
 506
 507         if(fit_blocks == 0) {
 508                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 509                 return -1;
 510         }
 511
 512         if(fit_length != length) {
 513                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 514                         addr, length, fit_length);
 515                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 516         }
 517
 518         return 0;
 519 }
 520
 521 static int flash_go(stlink_t *sl) {
 522         int error = -1;
 523
 524         // Some kinds of clock settings do not allow writing to flash.
 525         stlink_reset(sl);
 526
 527         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 528                 #ifdef DEBUG
 529                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 530                 #endif
 531
 532                 unsigned length = fb->length;
 533                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 534                         #ifdef DEBUG
 535                         printf("flash_do: page %08x\n", page);
 536                         #endif
 537
 538                         stlink_erase_flash_page(sl, page);
 539
 540                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 541                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 542                                 goto error;
 543                 }
 544
 545         }
 546
 547         stlink_reset(sl);
 548
 549         error = 0;
 550
 551 error:
 552         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 553                 next = fb->next;
 554                 free(fb->data);
 555                 free(fb);
 556         }
 557
 558         flash_root = NULL;
 559
 560         return error;
 561 }
 562
 563 int serve(stlink_t *sl, int port) {
 564         int sock = socket(AF_INET, SOCK_STREAM, 0);
 565         if(sock < 0) {
 566                 perror("socket");
 567                 return 1;
 568         }
 569
 570         unsigned int val = 1;
 571         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 572
 573         struct sockaddr_in serv_addr = {0};
 574         serv_addr.sin_family = AF_INET;
 575         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 576         serv_addr.sin_port = htons(port);
 577
 578         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 579                 perror("bind");
 580                 return 1;
 581         }
 582
 583         if(listen(sock, 5) < 0) {
 584                 perror("listen");
 585                 return 1;
 586         }
 587
 588         stlink_force_debug(sl);
 589         stlink_reset(sl);
 590         init_code_breakpoints(sl);
 591         init_data_watchpoints(sl);
 592
 593         printf("Listening at *:%d...\n", port);
 594
 595         int client = accept(sock, NULL, NULL);
 596         signal (SIGINT, SIG_DFL);
 597         if(client < 0) {
 598                 perror("accept");
 599                 return 1;
 600         }
 601
 602         close(sock);
 603
 604         printf("GDB connected.\n");
 605
 606         /*
 607          * To allow resetting the chip from GDB it is required to
 608          * emulate attaching and detaching to target.
 609          */
 610         unsigned int attached = 1;
 611
 612         while(1) {
 613                 char* packet;
 614
 615                 int status = gdb_recv_packet(client, &packet);
 616                 if(status < 0) {
 617                         fprintf(stderr, "cannot recv: %d\n", status);
 618                         return 1;
 619                 }
 620
 621                 #ifdef DEBUG
 622                 printf("recv: %s\n", packet);
 623                 #endif
 624
 625                 char* reply = NULL;
 626                 reg regp;
 627
 628                 switch(packet[0]) {
 629                 case 'q': {
 630                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 631                                 reply = strdup("");
 632                                 break;
 633                         }
 634
 635                         char *separator = strstr(packet, ":"), *params = "";
 636                         if(separator == NULL) {
 637                                 separator = packet + strlen(packet);
 638                         } else {
 639                                 params = separator + 1;
 640                         }
 641
 642                         unsigned queryNameLength = (separator - &packet[1]);
 643                         char* queryName = calloc(queryNameLength + 1, 1);
 644                         strncpy(queryName, &packet[1], queryNameLength);
 645
 646                         #ifdef DEBUG
 647                         printf("query: %s;%s\n", queryName, params);
 648                         #endif
 649
 650                         if(!strcmp(queryName, "Supported")) {
 651                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 652                         } else if(!strcmp(queryName, "Xfer")) {
 653                                 char *type, *op, *s_addr, *s_length;
 654                                 char *tok = params;
 655                                 char *annex __attribute__((unused));
 656
 657                                 type     = strsep(&tok, ":");
 658                                 op       = strsep(&tok, ":");
 659                                 annex    = strsep(&tok, ":");
 660                                 s_addr   = strsep(&tok, ",");
 661                                 s_length = tok;
 662
 663                                 unsigned addr = strtoul(s_addr, NULL, 16),
 664                                        length = strtoul(s_length, NULL, 16);
 665
 666                                 #ifdef DEBUG
 667                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 668                                         type, op, annex, addr, length);
 669                                 #endif
 670
 671                                 const char* data = NULL;
 672
 673                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 674                                         data = current_memory_map;
 675
 676                                 if(data) {
 677                                         unsigned data_length = strlen(data);
 678                                         if(addr + length > data_length)
 679                                                 length = data_length - addr;
 680
 681                                         if(length == 0) {
 682                                                 reply = strdup("l");
 683                                         } else {
 684                                                 reply = calloc(length + 2, 1);
 685                                                 reply[0] = 'm';
 686                                                 strncpy(&reply[1], data, length);
 687                                         }
 688                                 }
 689                         }
 690
 691                         if(reply == NULL)
 692                                 reply = strdup("");
 693
 694                         free(queryName);
 695
 696                         break;
 697                 }
 698
 699                 case 'v': {
 700                         char *params = NULL;
 701                         char *cmdName = strtok_r(packet, ":;", &params);
 702
 703                         cmdName++; // vCommand -> Command
 704
 705                         if(!strcmp(cmdName, "FlashErase")) {
 706                                 char *s_addr, *s_length;
 707                                 char *tok = params;
 708
 709                                 s_addr   = strsep(&tok, ",");
 710                                 s_length = tok;
 711
 712                                 unsigned addr = strtoul(s_addr, NULL, 16),
 713                                        length = strtoul(s_length, NULL, 16);
 714
 715                                 #ifdef DEBUG
 716                                 printf("FlashErase: addr:%08x,len:%04x\n",
 717                                         addr, length);
 718                                 #endif
 719
 720                                 if(flash_add_block(addr, length, sl) < 0) {
 721                                         reply = strdup("E00");
 722                                 } else {
 723                                         reply = strdup("OK");
 724                                 }
 725                         } else if(!strcmp(cmdName, "FlashWrite")) {
 726                                 char *s_addr, *data;
 727                                 char *tok = params;
 728
 729                                 s_addr = strsep(&tok, ":");
 730                                 data   = tok;
 731
 732                                 unsigned addr = strtoul(s_addr, NULL, 16);
 733                                 unsigned data_length = status - (data - packet);
 734
 735                                 // Length of decoded data cannot be more than
 736                                 // encoded, as escapes are removed.
 737                                 // Additional byte is reserved for alignment fix.
 738                                 uint8_t *decoded = calloc(data_length + 1, 1);
 739                                 unsigned dec_index = 0;
 740                                 for(int i = 0; i < data_length; i++) {
 741                                         if(data[i] == 0x7d) {
 742                                                 i++;
 743                                                 decoded[dec_index++] = data[i] ^ 0x20;
 744                                         } else {
 745                                                 decoded[dec_index++] = data[i];
 746                                         }
 747                                 }
 748
 749                                 // Fix alignment
 750                                 if(dec_index % 2 != 0)
 751                                         dec_index++;
 752
 753                                 #ifdef DEBUG
 754                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 755                                 #endif
 756
 757                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 758                                         reply = strdup("E00");
 759                                 } else {
 760                                         reply = strdup("OK");
 761                                 }
 762                         } else if(!strcmp(cmdName, "FlashDone")) {
 763                                 if(flash_go(sl) < 0) {
 764                                         reply = strdup("E00");
 765                                 } else {
 766                                         reply = strdup("OK");
 767                                 }
 768                         } else if(!strcmp(cmdName, "Kill")) {
 769                                 attached = 0;
 770
 771                                 reply = strdup("OK");
 772                         }
 773
 774                         if(reply == NULL)
 775                                 reply = strdup("");
 776
 777                         break;
 778                 }
 779
 780                 case 'c':
 781                         stlink_run(sl);
 782
 783                         while(1) {
 784                                 int status = gdb_check_for_interrupt(client);
 785                                 if(status < 0) {
 786                                         fprintf(stderr, "cannot check for int: %d\n", status);
 787                                         return 1;
 788                                 }
 789
 790                                 if(status == 1) {
 791                                         stlink_force_debug(sl);
 792                                         break;
 793                                 }
 794
 795                                 stlink_status(sl);
 796                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 797                                         break;
 798                                 }
 799
 800                                 usleep(100000);
 801                         }
 802
 803                         reply = strdup("S05"); // TRAP
 804                         break;
 805
 806                 case 's':
 807                         stlink_step(sl);
 808
 809                         reply = strdup("S05"); // TRAP
 810                         break;
 811
 812                 case '?':
 813                         if(attached) {
 814                                 reply = strdup("S05"); // TRAP
 815                         } else {
 816                                 /* Stub shall reply OK if not attached. */
 817                                 reply = strdup("OK");
 818                         }
 819                         break;
 820
 821                 case 'g':
 822                         stlink_read_all_regs(sl, &regp);
 823
 824                         reply = calloc(8 * 16 + 1, 1);
 825                         for(int i = 0; i < 16; i++)
 826                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 827
 828                         break;
 829
 830                 case 'p': {
 831                         unsigned id = strtoul(&packet[1], NULL, 16);
 832                         unsigned myreg = 0xDEADDEAD;
 833
 834                         if(id < 16) {
 835                                 stlink_read_reg(sl, id, &regp);
 836                                 myreg = htonl(regp.r[id]);
 837                         } else if(id == 0x19) {
 838                                 stlink_read_reg(sl, 16, &regp);
 839                                 myreg = htonl(regp.xpsr);
 840                         } else {
 841                                 reply = strdup("E00");
 842                         }
 843
 844                         reply = calloc(8 + 1, 1);
 845                         sprintf(reply, "%08x", myreg);
 846
 847                         break;
 848                 }
 849
 850                 case 'P': {
 851                         char* s_reg = &packet[1];
 852                         char* s_value = strstr(&packet[1], "=") + 1;
 853
 854                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 855                         unsigned value = strtoul(s_value, NULL, 16);
 856
 857                         if(reg < 16) {
 858                                 stlink_write_reg(sl, ntohl(value), reg);
 859                         } else if(reg == 0x19) {
 860                                 stlink_write_reg(sl, ntohl(value), 16);
 861                         } else {
 862                                 reply = strdup("E00");
 863                         }
 864
 865                         if(!reply) {
 866                                 reply = strdup("OK");
 867                         }
 868
 869                         break;
 870                 }
 871
 872                 case 'G':
 873                         for(int i = 0; i < 16; i++) {
 874                                 char str[9] = {0};
 875                                 strncpy(str, &packet[1 + i * 8], 8);
 876                                 uint32_t reg = strtoul(str, NULL, 16);
 877                                 stlink_write_reg(sl, ntohl(reg), i);
 878                         }
 879
 880                         reply = strdup("OK");
 881                         break;
 882
 883                 case 'm': {
 884                         char* s_start = &packet[1];
 885                         char* s_count = strstr(&packet[1], ",") + 1;
 886
 887                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 888                         unsigned     count = strtoul(s_count, NULL, 16);
 889
 890                         unsigned adj_start = start % 4;
 891
 892                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 893                                                 count : count + 4 - (count % 4));
 894
 895                         reply = calloc(count * 2 + 1, 1);
 896                         for(int i = 0; i < count; i++) {
 897                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 898                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 899                         }
 900
 901                         break;
 902                 }
 903
 904                 case 'M': {
 905                         char* s_start = &packet[1];
 906                         char* s_count = strstr(&packet[1], ",") + 1;
 907                         char* hexdata = strstr(packet, ":") + 1;
 908
 909                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 910                         unsigned     count = strtoul(s_count, NULL, 16);
 911
 912                         for(int i = 0; i < count; i ++) {
 913                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 914                                 uint8_t byte = strtoul(hex, NULL, 16);
 915                                 sl->q_buf[i] = byte;
 916                         }
 917
 918                         if((count % 4) == 0 && (start % 4) == 0) {
 919                                 stlink_write_mem32(sl, start, count);
 920                         } else {
 921                                 stlink_write_mem8(sl, start, count);
 922                         }
 923
 924                         reply = strdup("OK");
 925
 926                         break;
 927                 }
 928
 929                 case 'Z': {
 930                         char *endptr;
 931                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 932                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 933
 934                         switch (packet[1]) {
 935                                 case '1':
 936                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 937                                         reply = strdup("E00");
 938                                 } else {
 939                                         reply = strdup("OK");
 940                                 }
 941                                 break;
 942
 943                                 case '2':   // insert write watchpoint
 944                                 case '3':   // insert read  watchpoint
 945                                 case '4':   // insert access watchpoint
 946                                 {
 947                                         enum watchfun wf;
 948                                         if(packet[1] == '2') {
 949                                                 wf = WATCHWRITE;
 950                                         } else if(packet[1] == '3') {
 951                                                 wf = WATCHREAD;
 952                                         } else {
 953                                                 wf = WATCHACCESS;
 954                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 955                                                         reply = strdup("E00");
 956                                                 } else {
 957                                                         reply = strdup("OK");
 958                                                         break;
 959                                                 }
 960                                         }
 961                                 }
 962
 963                                 default:
 964                                 reply = strdup("");
 965                         }
 966                         break;
 967                 }
 968                 case 'z': {
 969                         char *endptr;
 970                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 971                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 972
 973                         switch (packet[1]) {
 974                                 case '1': // remove breakpoint
 975                                 update_code_breakpoint(sl, addr, 0);
 976                                 reply = strdup("OK");
 977                                 break;
 978
 979                                 case '2' : // remove write watchpoint
 980                                 case '3' : // remove read watchpoint
 981                                 case '4' : // remove access watchpoint
 982                                 if(delete_data_watchpoint(sl, addr) < 0) {
 983                                         reply = strdup("E00");
 984                                 } else {
 985                                         reply = strdup("OK");
 986                                         break;
 987                                 }
 988
 989                                 default:
 990                                 reply = strdup("");
 991                         }
 992                         break;
 993                 }
 994
 995                 case '!': {
 996                         /*
 997                          * Enter extended mode which allows restarting.
 998                          * We do support that always.
 999                          */
1000
1001                         reply = strdup("OK");
1002
1003                         break;
1004                 }
1005
1006                 case 'R': {
1007                         /* Reset the core. */
1008
1009                         stlink_reset(sl);
1010                         init_code_breakpoints(sl);
1011                         init_data_watchpoints(sl);
1012
1013                         attached = 1;
1014
1015                         reply = strdup("OK");
1016
1017                         break;
1018                 }
1019
1020                 default:
1021                         reply = strdup("");
1022                 }
1023
1024                 if(reply) {
1025                         #ifdef DEBUG
1026                         printf("send: %s\n", reply);
1027                         #endif
1028
1029                         int result = gdb_send_packet(client, reply);
1030                         if(result != 0) {
1031                                 fprintf(stderr, "cannot send: %d\n", result);
1032                                 return 1;
1033                         }
1034
1035                         free(reply);
1036                 }
1037
1038                 free(packet);
1039         }
1040
1041         return 0;
1042 }