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 <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
  18 #include <stlink-common.h>
  19
  20 #include "gdb-remote.h"
  21
  22 #define FLASH_BASE 0x08000000
  23 #define FLASH_PAGE (sl->flash_pgsz)
  24 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  25 #define FLASH_SIZE (FLASH_PAGE * 128)
  26
  27 static const char hex[] = "0123456789abcdef";
  28
  29 static const char* current_memory_map = NULL;
  30
  31 struct chip_params {
  32         uint32_t chip_id;
  33         char* description;
  34         uint32_t max_flash_size, flash_pagesize;
  35         uint32_t sram_size;
  36         uint32_t bootrom_base, bootrom_size;
  37 } const devices[] = {
  38         { 0x412, "Low-density device",
  39           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  },
  40         { 0x410, "Medium-density device",
  41           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  },
  42         { 0x414, "High-density device",
  43           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },
  44         { 0x418, "Connectivity line device",
  45           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  46         { 0x420, "Medium-density value line device",
  47           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  48         { 0x428, "High-density value line device",
  49           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  50         { 0x430, "XL-density device",
  51           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  52         { 0 }
  53 };
  54
  55 int serve(stlink_t *sl, int port);
  56 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  57
  58 int main(int argc, char** argv) {
  59         if(argc != 3) {
  60                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  61                 return 1;
  62         }
  63
  64         // FIXME - hardcoded to usb....
  65         stlink_t *sl =stlink_open_usb(argv[2], 10);
  66         if (sl == NULL)
  67                 return 1;
  68
  69         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  70                 stlink_enter_swd_mode(sl);
  71
  72         uint32_t chip_id;
  73
  74         stlink_read_mem32(sl, 0xE0042000, 4);
  75         chip_id = sl->q_buf[0] | (sl->q_buf[1] << 8) | (sl->q_buf[2] << 16) |
  76                 (sl->q_buf[3] << 24);
  77
  78         printf("Chip ID is %08x.\n", chip_id);
  79
  80         const struct chip_params* params = NULL;
  81
  82         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
  83                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
  84                         params = &devices[i];
  85                         break;
  86                 }
  87         }
  88
  89         if(params == NULL) {
  90                 fprintf(stderr, "Cannot recognize the connected device!\n");
  91                 return 0;
  92         }
  93
  94         printf("Device connected: %s\n", params->description);
  95         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
  96                 params->sram_size, params->max_flash_size, params->flash_pagesize);
  97
  98         FLASH_PAGE = params->flash_pagesize;
  99
 100         uint32_t flash_size;
 101
 102         stlink_read_mem32(sl, 0x1FFFF7E0, 4);
 103         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 104
 105         printf("Flash size is %d KiB.\n", flash_size);
 106         // memory map is in 1k blocks.
 107         current_memory_map = make_memory_map(params, flash_size * 0x400);
 108
 109         int port = atoi(argv[1]);
 110
 111         while(serve(sl, port) == 0);
 112
 113         stlink_close(sl);
 114
 115         return 0;
 116 }
 117
 118 static const char* const memory_map_template =
 119   "<?xml version=\"1.0\"?>"
 120   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 121   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 122   "<memory-map>"
 123   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 124   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 125   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 126   "    <property name=\"blocksize\">0x%x</property>"
 127   "  </memory>"
 128   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 129   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 130   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 131   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 132   "</memory-map>";
 133
 134 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 135         /* This will be freed in serve() */
 136         char* map = malloc(4096);
 137         map[0] = '\0';
 138
 139         snprintf(map, 4096, memory_map_template,
 140                         flash_size,
 141                         params->sram_size,
 142                         flash_size, params->flash_pagesize,
 143                         params->bootrom_base, params->bootrom_size);
 144
 145         return map;
 146 }
 147
 148
 149 /*
 150  * DWT_COMP0     0xE0001020
 151  * DWT_MASK0     0xE0001024
 152  * DWT_FUNCTION0 0xE0001028
 153  * DWT_COMP1     0xE0001030
 154  * DWT_MASK1     0xE0001034
 155  * DWT_FUNCTION1 0xE0001038
 156  * DWT_COMP2     0xE0001040
 157  * DWT_MASK2     0xE0001044
 158  * DWT_FUNCTION2 0xE0001048
 159  * DWT_COMP3     0xE0001050
 160  * DWT_MASK3     0xE0001054
 161  * DWT_FUNCTION3 0xE0001058
 162  */
 163
 164 #define DATA_WATCH_NUM 4
 165
 166 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 167
 168 struct code_hw_watchpoint {
 169         stm32_addr_t addr;
 170         uint8_t mask;
 171         enum watchfun fun;
 172 };
 173
 174 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 175
 176 static void init_data_watchpoints(stlink_t *sl) {
 177         #ifdef DEBUG
 178         printf("init watchpoints\n");
 179         #endif
 180
 181         // set trcena in debug command to turn on dwt unit
 182         stlink_read_mem32(sl, 0xE000EDFC, 4);
 183         sl->q_buf[3] |= 1;
 184         stlink_write_mem32(sl, 0xE000EDFC, 4);
 185
 186         // make sure all watchpoints are cleared
 187         memset(sl->q_buf, 0, 4);
 188         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 189                 data_watches[i].fun = WATCHDISABLED;
 190                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 191         }
 192 }
 193
 194 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 195 {
 196         int i = 0;
 197         uint32_t mask;
 198
 199         // computer mask
 200         // find a free watchpoint
 201         // configure
 202
 203         mask = -1;
 204         i = len;
 205         while(i) {
 206                 i >>= 1;
 207                 mask++;
 208         }
 209
 210         if((mask != -1) && (mask < 16)) {
 211                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 212                         // is this an empty slot ?
 213                         if(data_watches[i].fun == WATCHDISABLED) {
 214                                 #ifdef DEBUG
 215                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 216                                 #endif
 217
 218                                 data_watches[i].fun = wf;
 219                                 data_watches[i].addr = addr;
 220                                 data_watches[i].mask = mask;
 221
 222                                 // insert comparator address
 223                                 sl->q_buf[0] = (addr & 0xff);
 224                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 225                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 226                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 227
 228                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 229
 230                                 // insert mask
 231                                 memset(sl->q_buf, 0, 4);
 232                                 sl->q_buf[0] = mask;
 233                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 234
 235                                 // insert function
 236                                 memset(sl->q_buf, 0, 4);
 237                                 sl->q_buf[0] = wf;
 238                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 239
 240                                 // just to make sure the matched bit is clear !
 241                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 242                                 return 0;
 243                         }
 244                 }
 245         }
 246
 247         #ifdef DEBUG
 248         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 249         #endif
 250         return -1;
 251 }
 252
 253 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 254 {
 255         int i;
 256
 257         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 258                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 259                         #ifdef DEBUG
 260                         printf("delete watchpoint %d addr %x\n", i, addr);
 261                         #endif
 262
 263                         memset(sl->q_buf, 0, 4);
 264                         data_watches[i].fun = WATCHDISABLED;
 265                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 266
 267                         return 0;
 268                 }
 269         }
 270
 271         #ifdef DEBUG
 272         printf("failure: delete watchpoint addr %x\n", addr);
 273         #endif
 274
 275         return -1;
 276 }
 277
 278 #define CODE_BREAK_NUM  6
 279 #define CODE_BREAK_LOW  0x01
 280 #define CODE_BREAK_HIGH 0x02
 281
 282 struct code_hw_breakpoint {
 283         stm32_addr_t addr;
 284         int          type;
 285 };
 286
 287 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 288
 289 static void init_code_breakpoints(stlink_t *sl) {
 290         memset(sl->q_buf, 0, 4);
 291         sl->q_buf[0] = 0x03; // KEY | ENABLE
 292         stlink_write_mem32(sl, 0xe0002000, 4);
 293
 294         memset(sl->q_buf, 0, 4);
 295         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 296                 code_breaks[i].type = 0;
 297                 stlink_write_mem32(sl, 0xe0002008 + i * 4, 4);
 298         }
 299 }
 300
 301 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 302         stm32_addr_t fpb_addr = addr & ~0x3;
 303         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 304
 305         if(addr & 1) {
 306                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 307                 return -1;
 308         }
 309
 310         int id = -1;
 311         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 312                 if(fpb_addr == code_breaks[i].addr ||
 313                         (set && code_breaks[i].type == 0)) {
 314                         id = i;
 315                         break;
 316                 }
 317         }
 318
 319         if(id == -1) {
 320                 if(set) return -1; // Free slot not found
 321                 else    return 0;  // Breakpoint is already removed
 322         }
 323
 324         struct code_hw_breakpoint* brk = &code_breaks[id];
 325
 326         brk->addr = fpb_addr;
 327
 328         if(set) brk->type |= type;
 329         else    brk->type &= ~type;
 330
 331         memset(sl->q_buf, 0, 4);
 332
 333         if(brk->type == 0) {
 334                 #ifdef DEBUG
 335                 printf("clearing hw break %d\n", id);
 336                 #endif
 337
 338                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 339         } else {
 340                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 341                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 342                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 343                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 344
 345                 #ifdef DEBUG
 346                 printf("setting hw break %d at %08x (%d)\n",
 347                         id, brk->addr, brk->type);
 348                 printf("reg %02x %02x %02x %02x\n",
 349                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 350                 #endif
 351
 352                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 353         }
 354
 355         return 0;
 356 }
 357
 358
 359 struct flash_block {
 360         stm32_addr_t addr;
 361         unsigned     length;
 362         uint8_t*     data;
 363
 364         struct flash_block* next;
 365 };
 366
 367 static struct flash_block* flash_root;
 368
 369 static int flash_add_block(stm32_addr_t addr, unsigned length,
 370                            stlink_t *sl) {
 371         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 372                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 373                 return -1;
 374         }
 375
 376         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 377                 fprintf(stderr, "flash_add_block: unaligned block\n");
 378                 return -1;
 379         }
 380
 381         struct flash_block* new = malloc(sizeof(struct flash_block));
 382         new->next = flash_root;
 383
 384         new->addr   = addr;
 385         new->length = length;
 386         new->data   = calloc(length, 1);
 387
 388         flash_root = new;
 389
 390         return 0;
 391 }
 392
 393 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 394         int fit_blocks = 0, fit_length = 0;
 395
 396         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 397                 /* Block: ------X------Y--------
 398                  * Data:            a-----b
 399                  *                a--b
 400                  *            a-----------b
 401                  * Block intersects with data, if:
 402                  *  a < Y && b > x
 403                  */
 404
 405                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 406                 unsigned a = addr, b = addr + length;
 407                 if(a < Y && b > X) {
 408                         // from start of the block
 409                         unsigned start = (a > X ? a : X) - X;
 410                         unsigned end   = (b > Y ? Y : b) - X;
 411
 412                         memcpy(fb->data + start, data, end - start);
 413
 414                         fit_blocks++;
 415                         fit_length += end - start;
 416                 }
 417         }
 418
 419         if(fit_blocks == 0) {
 420                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 421                 return -1;
 422         }
 423
 424         if(fit_length != length) {
 425                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 426                         addr, length, fit_length);
 427                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int flash_go(stlink_t *sl) {
 434         int error = -1;
 435
 436         // Some kinds of clock settings do not allow writing to flash.
 437         stlink_reset(sl);
 438
 439         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 440                 #ifdef DEBUG
 441                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 442                 #endif
 443
 444                 unsigned length = fb->length;
 445                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 446                         #ifdef DEBUG
 447                         printf("flash_do: page %08x\n", page);
 448                         #endif
 449
 450                         stlink_erase_flash_page(sl, page);
 451
 452                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 453                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 454                                 goto error;
 455                 }
 456
 457         }
 458
 459         stlink_reset(sl);
 460
 461         error = 0;
 462
 463 error:
 464         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 465                 next = fb->next;
 466                 free(fb->data);
 467                 free(fb);
 468         }
 469
 470         flash_root = NULL;
 471
 472         return error;
 473 }
 474
 475 int serve(stlink_t *sl, int port) {
 476         int sock = socket(AF_INET, SOCK_STREAM, 0);
 477         if(sock < 0) {
 478                 perror("socket");
 479                 return 1;
 480         }
 481
 482         unsigned int val = 1;
 483         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 484
 485         struct sockaddr_in serv_addr = {0};
 486         serv_addr.sin_family = AF_INET;
 487         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 488         serv_addr.sin_port = htons(port);
 489
 490         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 491                 perror("bind");
 492                 return 1;
 493         }
 494
 495         if(listen(sock, 5) < 0) {
 496                 perror("listen");
 497                 return 1;
 498         }
 499
 500         stlink_force_debug(sl);
 501         stlink_reset(sl);
 502         init_code_breakpoints(sl);
 503         init_data_watchpoints(sl);
 504
 505         printf("Listening at *:%d...\n", port);
 506
 507         int client = accept(sock, NULL, NULL);
 508         if(client < 0) {
 509                 perror("accept");
 510                 return 1;
 511         }
 512
 513         close(sock);
 514
 515         printf("GDB connected.\n");
 516
 517         /*
 518          * To allow resetting the chip from GDB it is required to
 519          * emulate attaching and detaching to target.
 520          */
 521         unsigned int attached = 1;
 522
 523         while(1) {
 524                 char* packet;
 525
 526                 int status = gdb_recv_packet(client, &packet);
 527                 if(status < 0) {
 528                         fprintf(stderr, "cannot recv: %d\n", status);
 529                         return 1;
 530                 }
 531
 532                 #ifdef DEBUG
 533                 printf("recv: %s\n", packet);
 534                 #endif
 535
 536                 char* reply = NULL;
 537                 reg regp;
 538
 539                 switch(packet[0]) {
 540                 case 'q': {
 541                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 542                                 reply = strdup("");
 543                                 break;
 544                         }
 545
 546                         char *separator = strstr(packet, ":"), *params = "";
 547                         if(separator == NULL) {
 548                                 separator = packet + strlen(packet);
 549                         } else {
 550                                 params = separator + 1;
 551                         }
 552
 553                         unsigned queryNameLength = (separator - &packet[1]);
 554                         char* queryName = calloc(queryNameLength + 1, 1);
 555                         strncpy(queryName, &packet[1], queryNameLength);
 556
 557                         #ifdef DEBUG
 558                         printf("query: %s;%s\n", queryName, params);
 559                         #endif
 560
 561                         if(!strcmp(queryName, "Supported")) {
 562                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 563                         } else if(!strcmp(queryName, "Xfer")) {
 564                                 char *type, *op, *annex, *s_addr, *s_length;
 565                                 char *tok = params;
 566
 567                                 type     = strsep(&tok, ":");
 568                                 op       = strsep(&tok, ":");
 569                                 annex    = strsep(&tok, ":");
 570                                 s_addr   = strsep(&tok, ",");
 571                                 s_length = tok;
 572
 573                                 unsigned addr = strtoul(s_addr, NULL, 16),
 574                                        length = strtoul(s_length, NULL, 16);
 575
 576                                 #ifdef DEBUG
 577                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 578                                         type, op, annex, addr, length);
 579                                 #endif
 580
 581                                 const char* data = NULL;
 582
 583                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 584                                         data = current_memory_map;
 585
 586                                 if(data) {
 587                                         unsigned data_length = strlen(data);
 588                                         if(addr + length > data_length)
 589                                                 length = data_length - addr;
 590
 591                                         if(length == 0) {
 592                                                 reply = strdup("l");
 593                                         } else {
 594                                                 reply = calloc(length + 2, 1);
 595                                                 reply[0] = 'm';
 596                                                 strncpy(&reply[1], data, length);
 597                                         }
 598                                 }
 599                         }
 600
 601                         if(reply == NULL)
 602                                 reply = strdup("");
 603
 604                         free(queryName);
 605
 606                         break;
 607                 }
 608
 609                 case 'v': {
 610                         char *params = NULL;
 611                         char *cmdName = strtok_r(packet, ":;", &params);
 612
 613                         cmdName++; // vCommand -> Command
 614
 615                         if(!strcmp(cmdName, "FlashErase")) {
 616                                 char *s_addr, *s_length;
 617                                 char *tok = params;
 618
 619                                 s_addr   = strsep(&tok, ",");
 620                                 s_length = tok;
 621
 622                                 unsigned addr = strtoul(s_addr, NULL, 16),
 623                                        length = strtoul(s_length, NULL, 16);
 624
 625                                 #ifdef DEBUG
 626                                 printf("FlashErase: addr:%08x,len:%04x\n",
 627                                         addr, length);
 628                                 #endif
 629
 630                                 if(flash_add_block(addr, length, sl) < 0) {
 631                                         reply = strdup("E00");
 632                                 } else {
 633                                         reply = strdup("OK");
 634                                 }
 635                         } else if(!strcmp(cmdName, "FlashWrite")) {
 636                                 char *s_addr, *data;
 637                                 char *tok = params;
 638
 639                                 s_addr = strsep(&tok, ":");
 640                                 data   = tok;
 641
 642                                 unsigned addr = strtoul(s_addr, NULL, 16);
 643                                 unsigned data_length = status - (data - packet);
 644
 645                                 // Length of decoded data cannot be more than
 646                                 // encoded, as escapes are removed.
 647                                 // Additional byte is reserved for alignment fix.
 648                                 uint8_t *decoded = calloc(data_length + 1, 1);
 649                                 unsigned dec_index = 0;
 650                                 for(int i = 0; i < data_length; i++) {
 651                                         if(data[i] == 0x7d) {
 652                                                 i++;
 653                                                 decoded[dec_index++] = data[i] ^ 0x20;
 654                                         } else {
 655                                                 decoded[dec_index++] = data[i];
 656                                         }
 657                                 }
 658
 659                                 // Fix alignment
 660                                 if(dec_index % 2 != 0)
 661                                         dec_index++;
 662
 663                                 #ifdef DEBUG
 664                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 665                                 #endif
 666
 667                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 668                                         reply = strdup("E00");
 669                                 } else {
 670                                         reply = strdup("OK");
 671                                 }
 672                         } else if(!strcmp(cmdName, "FlashDone")) {
 673                                 if(flash_go(sl) < 0) {
 674                                         reply = strdup("E00");
 675                                 } else {
 676                                         reply = strdup("OK");
 677                                 }
 678                         } else if(!strcmp(cmdName, "Kill")) {
 679                                 attached = 0;
 680
 681                                 reply = strdup("OK");
 682                         }
 683
 684                         if(reply == NULL)
 685                                 reply = strdup("");
 686
 687                         break;
 688                 }
 689
 690                 case 'c':
 691                         stlink_run(sl);
 692
 693                         while(1) {
 694                                 int status = gdb_check_for_interrupt(client);
 695                                 if(status < 0) {
 696                                         fprintf(stderr, "cannot check for int: %d\n", status);
 697                                         return 1;
 698                                 }
 699
 700                                 if(status == 1) {
 701                                         stlink_force_debug(sl);
 702                                         break;
 703                                 }
 704
 705                                 stlink_status(sl);
 706                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 707                                         break;
 708                                 }
 709
 710                                 usleep(100000);
 711                         }
 712
 713                         reply = strdup("S05"); // TRAP
 714                         break;
 715
 716                 case 's':
 717                         stlink_step(sl);
 718
 719                         reply = strdup("S05"); // TRAP
 720                         break;
 721
 722                 case '?':
 723                         if(attached) {
 724                                 reply = strdup("S05"); // TRAP
 725                         } else {
 726                                 /* Stub shall reply OK if not attached. */
 727                                 reply = strdup("OK");
 728                         }
 729                         break;
 730
 731                 case 'g':
 732                         stlink_read_all_regs(sl, &regp);
 733
 734                         reply = calloc(8 * 16 + 1, 1);
 735                         for(int i = 0; i < 16; i++)
 736                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 737
 738                         break;
 739
 740                 case 'p': {
 741                         unsigned id = strtoul(&packet[1], NULL, 16);
 742                         unsigned myreg = 0xDEADDEAD;
 743
 744                         if(id < 16) {
 745                                 stlink_read_reg(sl, id, &regp);
 746                                 myreg = htonl(regp.r[id]);
 747                         } else if(id == 0x19) {
 748                                 stlink_read_reg(sl, 16, &regp);
 749                                 myreg = htonl(regp.xpsr);
 750                         } else {
 751                                 reply = strdup("E00");
 752                         }
 753
 754                         reply = calloc(8 + 1, 1);
 755                         sprintf(reply, "%08x", myreg);
 756
 757                         break;
 758                 }
 759
 760                 case 'P': {
 761                         char* s_reg = &packet[1];
 762                         char* s_value = strstr(&packet[1], "=") + 1;
 763
 764                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 765                         unsigned value = strtoul(s_value, NULL, 16);
 766
 767                         if(reg < 16) {
 768                                 stlink_write_reg(sl, ntohl(value), reg);
 769                         } else if(reg == 0x19) {
 770                                 stlink_write_reg(sl, ntohl(value), 16);
 771                         } else {
 772                                 reply = strdup("E00");
 773                         }
 774
 775                         if(!reply) {
 776                                 reply = strdup("OK");
 777                         }
 778
 779                         break;
 780                 }
 781
 782                 case 'G':
 783                         for(int i = 0; i < 16; i++) {
 784                                 char str[9] = {0};
 785                                 strncpy(str, &packet[1 + i * 8], 8);
 786                                 uint32_t reg = strtoul(str, NULL, 16);
 787                                 stlink_write_reg(sl, ntohl(reg), i);
 788                         }
 789
 790                         reply = strdup("OK");
 791                         break;
 792
 793                 case 'm': {
 794                         char* s_start = &packet[1];
 795                         char* s_count = strstr(&packet[1], ",") + 1;
 796
 797                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 798                         unsigned     count = strtoul(s_count, NULL, 16);
 799
 800                         unsigned adj_start = start % 4;
 801
 802                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 803                                                 count : count + 4 - (count % 4));
 804
 805                         reply = calloc(count * 2 + 1, 1);
 806                         for(int i = 0; i < count; i++) {
 807                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 808                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 809                         }
 810
 811                         break;
 812                 }
 813
 814                 case 'M': {
 815                         char* s_start = &packet[1];
 816                         char* s_count = strstr(&packet[1], ",") + 1;
 817                         char* hexdata = strstr(packet, ":") + 1;
 818
 819                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 820                         unsigned     count = strtoul(s_count, NULL, 16);
 821
 822                         for(int i = 0; i < count; i ++) {
 823                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 824                                 uint8_t byte = strtoul(hex, NULL, 16);
 825                                 sl->q_buf[i] = byte;
 826                         }
 827
 828                         if((count % 4) == 0 && (start % 4) == 0) {
 829                                 stlink_write_mem32(sl, start, count);
 830                         } else {
 831                                 stlink_write_mem8(sl, start, count);
 832                         }
 833
 834                         reply = strdup("OK");
 835
 836                         break;
 837                 }
 838
 839                 case 'Z': {
 840                         char *endptr;
 841                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 842                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 843
 844                         switch (packet[1]) {
 845                                 case '1':
 846                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 847                                         reply = strdup("E00");
 848                                 } else {
 849                                         reply = strdup("OK");
 850                                 }
 851                                 break;
 852
 853                                 case '2':   // insert write watchpoint
 854                                 case '3':   // insert read  watchpoint
 855                                 case '4':   // insert access watchpoint
 856                                 {
 857                                         enum watchfun wf;
 858                                         if(packet[1] == '2') {
 859                                                 wf = WATCHWRITE;
 860                                         } else if(packet[1] == '3') {
 861                                                 wf = WATCHREAD;
 862                                         } else {
 863                                                 wf = WATCHACCESS;
 864                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 865                                                         reply = strdup("E00");
 866                                                 } else {
 867                                                         reply = strdup("OK");
 868                                                         break;
 869                                                 }
 870                                         }
 871                                 }
 872
 873                                 default:
 874                                 reply = strdup("");
 875                         }
 876                         break;
 877                 }
 878                 case 'z': {
 879                         char *endptr;
 880                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 881                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 882
 883                         switch (packet[1]) {
 884                                 case '1': // remove breakpoint
 885                                 update_code_breakpoint(sl, addr, 0);
 886                                 reply = strdup("OK");
 887                                 break;
 888
 889                                 case '2' : // remove write watchpoint
 890                                 case '3' : // remove read watchpoint
 891                                 case '4' : // remove access watchpoint
 892                                 if(delete_data_watchpoint(sl, addr) < 0) {
 893                                         reply = strdup("E00");
 894                                 } else {
 895                                         reply = strdup("OK");
 896                                         break;
 897                                 }
 898
 899                                 default:
 900                                 reply = strdup("");
 901                         }
 902                         break;
 903                 }
 904
 905                 case '!': {
 906                         /*
 907                          * Enter extended mode which allows restarting.
 908                          * We do support that always.
 909                          */
 910
 911                         reply = strdup("OK");
 912
 913                         break;
 914                 }
 915
 916                 case 'R': {
 917                         /* Reset the core. */
 918
 919                         stlink_reset(sl);
 920                         init_code_breakpoints(sl);
 921                         init_data_watchpoints(sl);
 922
 923                         attached = 1;
 924
 925                         reply = strdup("OK");
 926
 927                         break;
 928                 }
 929
 930                 default:
 931                         reply = strdup("");
 932                 }
 933
 934                 if(reply) {
 935                         #ifdef DEBUG
 936                         printf("send: %s\n", reply);
 937                         #endif
 938
 939                         int result = gdb_send_packet(client, reply);
 940                         if(result != 0) {
 941                                 fprintf(stderr, "cannot send: %d\n", result);
 942                                 return 1;
 943                         }
 944
 945                         free(reply);
 946                 }
 947
 948                 free(packet);
 949         }
 950
 951         return 0;
 952 }