git.gag.com Git - fw/stlink/blob - src/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 <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <sys/socket.h>
  15 #include <netinet/in.h>
  16 #include <arpa/inet.h>
  17 #include "gdb-remote.h"
  18 #include "stlink-hw.h"
  19
  20 static const char hex[] = "0123456789abcdef";
  21
  22 static const char* current_memory_map = NULL;
  23
  24 struct chip_params {
  25         uint32_t chip_id;
  26         char* description;
  27         uint32_t max_flash_size, flash_pagesize;
  28         uint32_t sram_size;
  29         uint32_t bootrom_base, bootrom_size;
  30 } const devices[] = {
  31         { 0x412, "Low-density device",
  32           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  },
  33         { 0x410, "Medium-density device",
  34           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  },
  35         { 0x414, "High-density device",
  36           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },
  37         { 0x418, "Connectivity line device",
  38           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  39         { 0x420, "Medium-density value line device",
  40           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  41         { 0x428, "High-density value line device",
  42           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  43         { 0x430, "XL-density device",
  44           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  45         { 0 }
  46 };
  47
  48 int serve(struct stlink* sl, int port);
  49 static char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  50
  51 int main(int argc, char** argv) {
  52         if(argc != 3) {
  53                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  54                 return 1;
  55         }
  56
  57         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  58         if (sl == NULL)
  59                 return 1;
  60
  61         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  62                 stlink_enter_swd_mode(sl);
  63
  64         uint32_t chip_id;
  65
  66         stlink_read_mem32(sl, 0xE0042000, 4);
  67         chip_id = sl->q_buf[0] | (sl->q_buf[1] << 8) | (sl->q_buf[2] << 16) |
  68                 (sl->q_buf[3] << 24);
  69
  70         printf("Chip ID is %08x.\n", chip_id);
  71
  72         const struct chip_params* params = NULL;
  73
  74         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
  75                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
  76                         params = &devices[i];
  77                         break;
  78                 }
  79         }
  80
  81         if(params == NULL) {
  82                 fprintf(stderr, "Cannot recognize the connected device!\n");
  83                 return 0;
  84         }
  85
  86         printf("Device connected: %s\n", params->description);
  87         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
  88                 params->sram_size, params->max_flash_size, params->flash_pagesize);
  89
  90         uint32_t flash_size;
  91
  92         stlink_read_mem32(sl, 0x1FFFF7E0, 4);
  93         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
  94
  95         printf("Flash size is %d KiB.\n", flash_size);
  96
  97         current_memory_map = make_memory_map(params, flash_size * 0x400);
  98
  99         int port = atoi(argv[1]);
 100
 101         while(serve(sl, port) == 0);
 102
 103         stlink_close(sl);
 104
 105         return 0;
 106 }
 107
 108 static const char* const memory_map_template =
 109   "<?xml version=\"1.0\"?>"
 110   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 111   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 112   "<memory-map>"
 113   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 114   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 115   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 116   "    <property name=\"blocksize\">0x%x</property>"
 117   "  </memory>"
 118   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 119   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 120   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 121   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 122   "</memory-map>";
 123
 124 static char*
 125 make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 126         /* This will be freed in serve() */
 127         char* map = malloc(4096);
 128         map[0] = '\0';
 129
 130         snprintf(map, 4096, memory_map_template,
 131                         flash_size,
 132                         params->sram_size,
 133                         flash_size, params->flash_pagesize,
 134                         params->bootrom_base, params->bootrom_size);
 135
 136         return map;
 137 }
 138
 139 #define CODE_BREAK_NUM  6
 140
 141 #define CODE_BREAK_LOW  0x01
 142 #define CODE_BREAK_HIGH 0x02
 143
 144 struct code_hw_breakpoint {
 145         stm32_addr_t addr;
 146         int          type;
 147 };
 148
 149 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 150
 151 static void init_code_breakpoints(struct stlink* sl) {
 152         memset(sl->q_buf, 0, 4);
 153         sl->q_buf[0] = 0x03; // KEY | ENABLE
 154         stlink_write_mem32(sl, 0xe0002000, 4);
 155
 156         memset(sl->q_buf, 0, 4);
 157         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 158                 code_breaks[i].type = 0;
 159                 stlink_write_mem32(sl, 0xe0002008 + i * 4, 4);
 160         }
 161 }
 162
 163 static int update_code_breakpoint(struct stlink* sl, stm32_addr_t addr, int set) {
 164         stm32_addr_t fpb_addr = addr & ~0x3;
 165         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 166
 167         if(addr & 1) {
 168                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 169                 return -1;
 170         }
 171
 172         int id = -1;
 173         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 174                 if(fpb_addr == code_breaks[i].addr ||
 175                         (set && code_breaks[i].type == 0)) {
 176                         id = i;
 177                         break;
 178                 }
 179         }
 180
 181         if(id == -1) {
 182                 if(set) return -1; // Free slot not found
 183                 else    return 0;  // Breakpoint is already removed
 184         }
 185
 186         struct code_hw_breakpoint* brk = &code_breaks[id];
 187
 188         brk->addr = fpb_addr;
 189
 190         if(set) brk->type |= type;
 191         else    brk->type &= ~type;
 192
 193         memset(sl->q_buf, 0, 4);
 194
 195         if(brk->type == 0) {
 196                 #ifdef DEBUG
 197                 printf("clearing hw break %d\n", id);
 198                 #endif
 199
 200                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 201         } else {
 202                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 203                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 204                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 205                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 206
 207                 #ifdef DEBUG
 208                 printf("setting hw break %d at %08x (%d)\n",
 209                         id, brk->addr, brk->type);
 210                 printf("reg %02x %02x %02x %02x\n",
 211                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 212                 #endif
 213
 214                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 215         }
 216
 217         return 0;
 218 }
 219
 220 #define FLASH_BASE 0x08000000
 221 #define FLASH_PAGE 0x400
 222 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
 223 #define FLASH_SIZE (FLASH_PAGE * 128)
 224
 225 struct flash_block {
 226         stm32_addr_t addr;
 227         unsigned     length;
 228         uint8_t*     data;
 229
 230         struct flash_block* next;
 231 };
 232
 233 static struct flash_block* flash_root;
 234
 235 static int flash_add_block(stm32_addr_t addr, unsigned length) {
 236         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 237                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 238                 return -1;
 239         }
 240
 241         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 242                 fprintf(stderr, "flash_add_block: unaligned block\n");
 243                 return -1;
 244         }
 245
 246         struct flash_block* new = malloc(sizeof(struct flash_block));
 247         new->next = flash_root;
 248
 249         new->addr   = addr;
 250         new->length = length;
 251         new->data   = calloc(length, 1);
 252
 253         flash_root = new;
 254
 255         return 0;
 256 }
 257
 258 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 259         int fit_blocks = 0, fit_length = 0;
 260
 261         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 262                 /* Block: ------X------Y--------
 263                  * Data:            a-----b
 264                  *                a--b
 265                  *            a-----------b
 266                  * Block intersects with data, if:
 267                  *  a < Y && b > x
 268                  */
 269
 270                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 271                 unsigned a = addr, b = addr + length;
 272                 if(a < Y && b > X) {
 273                         // from start of the block
 274                         unsigned start = (a > X ? a : X) - X;
 275                         unsigned end   = (b > Y ? Y : b) - X;
 276
 277                         memcpy(fb->data + start, data, end - start);
 278
 279                         fit_blocks++;
 280                         fit_length += end - start;
 281                 }
 282         }
 283
 284         if(fit_blocks == 0) {
 285                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 286                 return -1;
 287         }
 288
 289         if(fit_length != length) {
 290                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 291                         addr, length, fit_length);
 292                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int flash_go(struct stlink* sl) {
 299         int error = -1;
 300
 301         // Some kinds of clock settings do not allow writing to flash.
 302         stlink_reset(sl);
 303
 304         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 305                 #ifdef DEBUG
 306                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 307                 #endif
 308
 309                 unsigned length = fb->length;
 310                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += 0x400) {
 311                         #ifdef DEBUG
 312                         printf("flash_do: page %08x\n", page);
 313                         #endif
 314
 315                         stlink_erase_flash_page(sl, page);
 316
 317                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 318                                         length > 0x400 ? 0x400 : length) < 0)
 319                                 goto error;
 320                 }
 321
 322         }
 323
 324         stlink_reset(sl);
 325
 326         error = 0;
 327
 328 error:
 329         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 330                 next = fb->next;
 331                 free(fb->data);
 332                 free(fb);
 333         }
 334
 335         flash_root = NULL;
 336
 337         return error;
 338 }
 339
 340 int serve(struct stlink* sl, int port) {
 341         int sock = socket(AF_INET, SOCK_STREAM, 0);
 342         if(sock < 0) {
 343                 perror("socket");
 344                 return 1;
 345         }
 346
 347         unsigned int val = 1;
 348         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 349
 350         struct sockaddr_in serv_addr = {0};
 351         serv_addr.sin_family = AF_INET;
 352         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 353         serv_addr.sin_port = htons(port);
 354
 355         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 356                 perror("bind");
 357                 return 1;
 358         }
 359
 360         if(listen(sock, 5) < 0) {
 361                 perror("listen");
 362                 return 1;
 363         }
 364
 365         stlink_force_debug(sl);
 366         stlink_reset(sl);
 367         init_code_breakpoints(sl);
 368
 369         printf("Listening at *:%d...\n", port);
 370
 371         int client = accept(sock, NULL, NULL);
 372         if(client < 0) {
 373                 perror("accept");
 374                 return 1;
 375         }
 376
 377         close(sock);
 378
 379         printf("GDB connected.\n");
 380
 381         /*
 382          * To allow resetting the chip from GDB it is required to
 383          * emulate attaching and detaching to target.
 384          */
 385         unsigned int attached = 1;
 386
 387         while(1) {
 388                 char* packet;
 389
 390                 int status = gdb_recv_packet(client, &packet);
 391                 if(status < 0) {
 392                         fprintf(stderr, "cannot recv: %d\n", status);
 393                         return 1;
 394                 }
 395
 396                 #ifdef DEBUG
 397                 printf("recv: %s\n", packet);
 398                 #endif
 399
 400                 char* reply = NULL;
 401
 402                 switch(packet[0]) {
 403                 case 'q': {
 404                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 405                                 reply = strdup("");
 406                                 break;
 407                         }
 408
 409                         char *separator = strstr(packet, ":"), *params = "";
 410                         if(separator == NULL) {
 411                                 separator = packet + strlen(packet);
 412                         } else {
 413                                 params = separator + 1;
 414                         }
 415
 416                         unsigned queryNameLength = (separator - &packet[1]);
 417                         char* queryName = calloc(queryNameLength + 1, 1);
 418                         strncpy(queryName, &packet[1], queryNameLength);
 419
 420                         #ifdef DEBUG
 421                         printf("query: %s;%s\n", queryName, params);
 422                         #endif
 423
 424                         if(!strcmp(queryName, "Supported")) {
 425                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 426                         } else if(!strcmp(queryName, "Xfer")) {
 427                                 char *type, *op, *annex, *s_addr, *s_length;
 428                                 char *tok = params;
 429
 430                                 type     = strsep(&tok, ":");
 431                                 op       = strsep(&tok, ":");
 432                                 annex    = strsep(&tok, ":");
 433                                 s_addr   = strsep(&tok, ",");
 434                                 s_length = tok;
 435
 436                                 unsigned addr = strtoul(s_addr, NULL, 16),
 437                                        length = strtoul(s_length, NULL, 16);
 438
 439                                 #ifdef DEBUG
 440                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 441                                         type, op, annex, addr, length);
 442                                 #endif
 443
 444                                 const char* data = NULL;
 445
 446                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 447                                         data = current_memory_map;
 448
 449                                 if(data) {
 450                                         unsigned data_length = strlen(data);
 451                                         if(addr + length > data_length)
 452                                                 length = data_length - addr;
 453
 454                                         if(length == 0) {
 455                                                 reply = strdup("l");
 456                                         } else {
 457                                                 reply = calloc(length + 2, 1);
 458                                                 reply[0] = 'm';
 459                                                 strncpy(&reply[1], data, length);
 460                                         }
 461                                 }
 462                         }
 463
 464                         if(reply == NULL)
 465                                 reply = strdup("");
 466
 467                         free(queryName);
 468
 469                         break;
 470                 }
 471
 472                 case 'v': {
 473                         char *params = NULL;
 474                         char *cmdName = strtok_r(packet, ":;", &params);
 475
 476                         cmdName++; // vCommand -> Command
 477
 478                         if(!strcmp(cmdName, "FlashErase")) {
 479                                 char *s_addr, *s_length;
 480                                 char *tok = params;
 481
 482                                 s_addr   = strsep(&tok, ",");
 483                                 s_length = tok;
 484
 485                                 unsigned addr = strtoul(s_addr, NULL, 16),
 486                                        length = strtoul(s_length, NULL, 16);
 487
 488                                 #ifdef DEBUG
 489                                 printf("FlashErase: addr:%08x,len:%04x\n",
 490                                         addr, length);
 491                                 #endif
 492
 493                                 if(flash_add_block(addr, length) < 0) {
 494                                         reply = strdup("E00");
 495                                 } else {
 496                                         reply = strdup("OK");
 497                                 }
 498                         } else if(!strcmp(cmdName, "FlashWrite")) {
 499                                 char *s_addr, *data;
 500                                 char *tok = params;
 501
 502                                 s_addr = strsep(&tok, ":");
 503                                 data   = tok;
 504
 505                                 unsigned addr = strtoul(s_addr, NULL, 16);
 506                                 unsigned data_length = status - (data - packet);
 507
 508                                 // Length of decoded data cannot be more than
 509                                 // encoded, as escapes are removed.
 510                                 // Additional byte is reserved for alignment fix.
 511                                 uint8_t *decoded = calloc(data_length + 1, 1);
 512                                 unsigned dec_index = 0;
 513                                 for(int i = 0; i < data_length; i++) {
 514                                         if(data[i] == 0x7d) {
 515                                                 i++;
 516                                                 decoded[dec_index++] = data[i] ^ 0x20;
 517                                         } else {
 518                                                 decoded[dec_index++] = data[i];
 519                                         }
 520                                 }
 521
 522                                 // Fix alignment
 523                                 if(dec_index % 2 != 0)
 524                                         dec_index++;
 525
 526                                 #ifdef DEBUG
 527                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 528                                 #endif
 529
 530                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 531                                         reply = strdup("E00");
 532                                 } else {
 533                                         reply = strdup("OK");
 534                                 }
 535                         } else if(!strcmp(cmdName, "FlashDone")) {
 536                                 if(flash_go(sl) < 0) {
 537                                         reply = strdup("E00");
 538                                 } else {
 539                                         reply = strdup("OK");
 540                                 }
 541                         } else if(!strcmp(cmdName, "Kill")) {
 542                                 attached = 0;
 543
 544                                 reply = strdup("OK");
 545                         }
 546
 547                         if(reply == NULL)
 548                                 reply = strdup("");
 549
 550                         break;
 551                 }
 552
 553                 case 'c':
 554                         stlink_run(sl);
 555
 556                         while(1) {
 557                                 int status = gdb_check_for_interrupt(client);
 558                                 if(status < 0) {
 559                                         fprintf(stderr, "cannot check for int: %d\n", status);
 560                                         return 1;
 561                                 }
 562
 563                                 if(status == 1) {
 564                                         stlink_force_debug(sl);
 565                                         break;
 566                                 }
 567
 568                                 stlink_status(sl);
 569                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 570                                         break;
 571                                 }
 572
 573                                 usleep(100000);
 574                         }
 575
 576                         reply = strdup("S05"); // TRAP
 577                         break;
 578
 579                 case 's':
 580                         stlink_step(sl);
 581
 582                         reply = strdup("S05"); // TRAP
 583                         break;
 584
 585                 case '?':
 586                         if(attached) {
 587                                 reply = strdup("S05"); // TRAP
 588                         } else {
 589                                 /* Stub shall reply OK if not attached. */
 590                                 reply = strdup("OK");
 591                         }
 592                         break;
 593
 594                 case 'g':
 595                         stlink_read_all_regs(sl);
 596
 597                         reply = calloc(8 * 16 + 1, 1);
 598                         for(int i = 0; i < 16; i++)
 599                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 600
 601                         break;
 602
 603                 case 'p': {
 604                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 605
 606                         if(id < 16) {
 607                                 stlink_read_reg(sl, id);
 608                                 reg = htonl(sl->reg.r[id]);
 609                         } else if(id == 0x19) {
 610                                 stlink_read_reg(sl, 16);
 611                                 reg = htonl(sl->reg.xpsr);
 612                         } else {
 613                                 reply = strdup("E00");
 614                         }
 615
 616                         reply = calloc(8 + 1, 1);
 617                         sprintf(reply, "%08x", reg);
 618
 619                         break;
 620                 }
 621
 622                 case 'P': {
 623                         char* s_reg = &packet[1];
 624                         char* s_value = strstr(&packet[1], "=") + 1;
 625
 626                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 627                         unsigned value = strtoul(s_value, NULL, 16);
 628
 629                         if(reg < 16) {
 630                                 stlink_write_reg(sl, ntohl(value), reg);
 631                         } else if(reg == 0x19) {
 632                                 stlink_write_reg(sl, ntohl(value), 16);
 633                         } else {
 634                                 reply = strdup("E00");
 635                         }
 636
 637                         if(!reply) {
 638                                 reply = strdup("OK");
 639                         }
 640
 641                         break;
 642                 }
 643
 644                 case 'G':
 645                         for(int i = 0; i < 16; i++) {
 646                                 char str[9] = {0};
 647                                 strncpy(str, &packet[1 + i * 8], 8);
 648                                 uint32_t reg = strtoul(str, NULL, 16);
 649                                 stlink_write_reg(sl, ntohl(reg), i);
 650                         }
 651
 652                         reply = strdup("OK");
 653                         break;
 654
 655                 case 'm': {
 656                         char* s_start = &packet[1];
 657                         char* s_count = strstr(&packet[1], ",") + 1;
 658
 659                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 660                         unsigned     count = strtoul(s_count, NULL, 16);
 661
 662                         unsigned adj_start = start % 4;
 663
 664                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 665                                                 count : count + 4 - (count % 4));
 666
 667                         reply = calloc(count * 2 + 1, 1);
 668                         for(int i = 0; i < count; i++) {
 669                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 670                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 671                         }
 672
 673                         break;
 674                 }
 675
 676                 case 'M': {
 677                         char* s_start = &packet[1];
 678                         char* s_count = strstr(&packet[1], ",") + 1;
 679                         char* hexdata = strstr(packet, ":") + 1;
 680
 681                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 682                         unsigned     count = strtoul(s_count, NULL, 16);
 683
 684                         for(int i = 0; i < count; i ++) {
 685                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 686                                 uint8_t byte = strtoul(hex, NULL, 16);
 687                                 sl->q_buf[i] = byte;
 688                         }
 689
 690                         if((count % 4) == 0 && (start % 4) == 0) {
 691                                 stlink_write_mem32(sl, start, count);
 692                         } else {
 693                                 stlink_write_mem8(sl, start, count);
 694                         }
 695
 696                         reply = strdup("OK");
 697
 698                         break;
 699                 }
 700
 701                 case 'Z': {
 702                         if(packet[1] == '1') {
 703                                 stm32_addr_t addr = strtoul(&packet[3], NULL, 16);
 704                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 705                                         reply = strdup("E00");
 706                                 } else {
 707                                         reply = strdup("OK");
 708                                 }
 709                         } else {
 710                                 reply = strdup("");
 711                         }
 712
 713                         break;
 714                 }
 715
 716                 case 'z': {
 717                         if(packet[1] == '1') {
 718                                 stm32_addr_t addr = strtoul(&packet[3], NULL, 16);
 719                                 update_code_breakpoint(sl, addr, 0);
 720
 721                                 reply = strdup("OK");
 722                         } else {
 723                                 reply = strdup("");
 724                         }
 725
 726                         break;
 727                 }
 728
 729                 case '!': {
 730                         /*
 731                          * Enter extended mode which allows restarting.
 732                          * We do support that always.
 733                          */
 734
 735                         reply = strdup("OK");
 736
 737                         break;
 738                 }
 739
 740                 case 'R': {
 741                         /* Reset the core. */
 742
 743                         stlink_reset(sl);
 744                         init_code_breakpoints(sl);
 745
 746                         attached = 1;
 747
 748                         reply = strdup("OK");
 749
 750                         break;
 751                 }
 752
 753                 default:
 754                         reply = strdup("");
 755                 }
 756
 757                 if(reply) {
 758                         #ifdef DEBUG
 759                         printf("send: %s\n", reply);
 760                         #endif
 761
 762                         int result = gdb_send_packet(client, reply);
 763                         if(result != 0) {
 764                                 fprintf(stderr, "cannot send: %d\n", result);
 765                                 return 1;
 766                         }
 767
 768                         free(reply);
 769                 }
 770
 771                 free(packet);
 772         }
 773
 774         return 0;
 775 }