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 /*
  32  * Chip IDs are explained in the appropriate programming manual for the
  33  * DBGMCU_IDCODE register (0xE0042000)
  34  */
  35 struct chip_params {
  36         uint32_t chip_id;
  37         char* description;
  38         uint32_t flash_size_reg;
  39         uint32_t max_flash_size, flash_pagesize;
  40         uint32_t sram_size;
  41         uint32_t bootrom_base, bootrom_size;
  42 } const devices[] = {
  43         { 0x410, "F1 Medium-density device", 0x1ffff7e0,
  44           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  }, // table 2, pm0063
  45         { 0x411, "F2 device", 0, /* No flash size register found in the docs*/
  46           0x100000,   0x20000, 0x20000, 0x1ff00000, 0x7800  }, // table 1, pm0059
  47         { 0x412, "F1 Low-density device", 0x1ffff7e0,
  48           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  }, // table 1, pm0063
  49         { 0x413, "F4 device", 0x1FFF7A10,
  50           0x100000,   0x20000, 0x20000,  0x1ff00000, 0x7800  }, // table 1, pm0081
  51         { 0x414, "F1 High-density device", 0x1ffff7e0,
  52           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },  // table 3 pm0063
  53           // This ignores the EEPROM! (and uses the page erase size,
  54           // not the sector write protection...)
  55         { 0x416, "L1 Med-density device", 0x1FF8004C, // table 1, pm0062
  56           0x20000, 0x100, 0x4000, 0x1ff00000, 0x1000 },
  57         { 0x418, "F1 Connectivity line device", 0x1ffff7e0,
  58           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  59         { 0x420, "F1 Medium-density value line device", 0x1ffff7e0,
  60           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  61         { 0x428, "F1 High-density value line device", 0x1ffff7e0,
  62           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  63         { 0x430, "F1 XL-density device", 0x1ffff7e0,  // pm0068
  64           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  65         { 0 }
  66 };
  67
  68 int serve(stlink_t *sl, int port);
  69 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  70
  71 int main(int argc, char** argv) {
  72
  73         stlink_t *sl = NULL;
  74
  75         const char * HelpStr =  "Usage:\n"
  76                                                                 "\t st-util port [/dev/sgX]\n"
  77                                                                 "\t st-util [port]\n"
  78                                                                 "\t st-util --help\n";
  79
  80         switch(argc) {
  81
  82                 default: {
  83                         fprintf(stderr, HelpStr, NULL);
  84                         return 1;
  85                 }
  86
  87                 case 3 : {
  88                         //sl = stlink_quirk_open(argv[2], 0);
  89                         // FIXME - hardcoded to usb....
  90                         sl = stlink_open_usb(argv[2], 10);
  91                         if(sl == NULL) return 1;
  92                         break;
  93                 }
  94
  95                 case 2 : {
  96                         if (strcmp(argv[1], "--help") == 0) {
  97                                 fprintf(stdout, HelpStr, NULL);
  98                                 return 1;
  99                         }
 100                 }
 101
 102                 case 1 : { // Search ST-LINK (from /dev/sg0 to /dev/sg99)
 103                         const int DevNumMax = 99;
 104                         int ExistDevCount = 0;
 105
 106                         for(int DevNum = 0; DevNum <= DevNumMax; DevNum++)
 107                         {
 108                                 if(DevNum < 10) {
 109                                         char DevName[] = "/dev/sgX";
 110                                         const int X_index = 7;
 111                                         DevName[X_index] = DevNum + '0';
 112                                         if ( !access(DevName, F_OK) ) {
 113                                                 sl = stlink_quirk_open(DevName, 0);
 114                                                 ExistDevCount++;
 115                                         }
 116                                 }
 117                                 else if(DevNum < 100) {
 118                                         char DevName[] = "/dev/sgXY";
 119                                         const int X_index = 7;
 120                                         const int Y_index = 8;
 121                                         DevName[X_index] = DevNum/10 + '0';
 122                                         DevName[Y_index] = DevNum%10 + '0';
 123                                         if ( !access(DevName, F_OK) ) {
 124                                                 sl = stlink_quirk_open(DevName, 0);
 125                                                 ExistDevCount++;
 126                                         }
 127                                 }
 128                                 if(sl != NULL) break;
 129                         }
 130
 131                         if(sl == NULL) {
 132                                 fprintf(stdout, "\nNumber of /dev/sgX devices found: %i \n",
 133                                                 ExistDevCount);
 134                                 fprintf(stderr, "ST-LINK not found\n");
 135                                 return 1;
 136                         }
 137                         break;
 138                 }
 139         }
 140
 141         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
 142                 stlink_enter_swd_mode(sl);
 143
 144         uint32_t chip_id = stlink_chip_id(sl);
 145         printf("Chip ID is %08x.\n", chip_id);
 146
 147         const struct chip_params* params = NULL;
 148
 149         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
 150                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
 151                         params = &devices[i];
 152                         break;
 153                 }
 154         }
 155
 156         if(params == NULL) {
 157                 fprintf(stderr, "Cannot recognize the connected device!\n");
 158                 return 0;
 159         }
 160
 161         printf("Device connected: %s\n", params->description);
 162         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 163                 params->sram_size, params->max_flash_size, params->flash_pagesize);
 164
 165         FLASH_PAGE = params->flash_pagesize;
 166
 167         uint32_t flash_size;
 168
 169         stlink_read_mem32(sl, params->flash_size_reg, 4);
 170         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 171
 172         printf("Flash size is %d KiB.\n", flash_size);
 173         // memory map is in 1k blocks.
 174         current_memory_map = make_memory_map(params, flash_size * 0x400);
 175
 176         int port;
 177
 178         if(argc == 1) {
 179                 // not on 64bit?
 180                 //srand((unsigned int)&port);
 181                 port = rand()/65535;
 182         }
 183         else {
 184                 port = atoi(argv[1]);
 185         }
 186
 187         while(serve(sl, port) == 0);
 188
 189         stlink_close(sl);
 190
 191         return 0;
 192 }
 193
 194 static const char* const memory_map_template =
 195   "<?xml version=\"1.0\"?>"
 196   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 197   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 198   "<memory-map>"
 199   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 200   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 201   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 202   "    <property name=\"blocksize\">0x%x</property>"
 203   "  </memory>"
 204   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 205   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 206   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 207   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 208   "</memory-map>";
 209
 210 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 211         /* This will be freed in serve() */
 212         char* map = malloc(4096);
 213         map[0] = '\0';
 214
 215         snprintf(map, 4096, memory_map_template,
 216                         flash_size,
 217                         params->sram_size,
 218                         flash_size, params->flash_pagesize,
 219                         params->bootrom_base, params->bootrom_size);
 220
 221         return map;
 222 }
 223
 224
 225 /*
 226  * DWT_COMP0     0xE0001020
 227  * DWT_MASK0     0xE0001024
 228  * DWT_FUNCTION0 0xE0001028
 229  * DWT_COMP1     0xE0001030
 230  * DWT_MASK1     0xE0001034
 231  * DWT_FUNCTION1 0xE0001038
 232  * DWT_COMP2     0xE0001040
 233  * DWT_MASK2     0xE0001044
 234  * DWT_FUNCTION2 0xE0001048
 235  * DWT_COMP3     0xE0001050
 236  * DWT_MASK3     0xE0001054
 237  * DWT_FUNCTION3 0xE0001058
 238  */
 239
 240 #define DATA_WATCH_NUM 4
 241
 242 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 243
 244 struct code_hw_watchpoint {
 245         stm32_addr_t addr;
 246         uint8_t mask;
 247         enum watchfun fun;
 248 };
 249
 250 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 251
 252 static void init_data_watchpoints(stlink_t *sl) {
 253         #ifdef DEBUG
 254         printf("init watchpoints\n");
 255         #endif
 256
 257         // set trcena in debug command to turn on dwt unit
 258         stlink_read_mem32(sl, 0xE000EDFC, 4);
 259         sl->q_buf[3] |= 1;
 260         stlink_write_mem32(sl, 0xE000EDFC, 4);
 261
 262         // make sure all watchpoints are cleared
 263         memset(sl->q_buf, 0, 4);
 264         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 265                 data_watches[i].fun = WATCHDISABLED;
 266                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 267         }
 268 }
 269
 270 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 271 {
 272         int i = 0;
 273         uint32_t mask;
 274
 275         // computer mask
 276         // find a free watchpoint
 277         // configure
 278
 279         mask = -1;
 280         i = len;
 281         while(i) {
 282                 i >>= 1;
 283                 mask++;
 284         }
 285
 286         if((mask != -1) && (mask < 16)) {
 287                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 288                         // is this an empty slot ?
 289                         if(data_watches[i].fun == WATCHDISABLED) {
 290                                 #ifdef DEBUG
 291                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 292                                 #endif
 293
 294                                 data_watches[i].fun = wf;
 295                                 data_watches[i].addr = addr;
 296                                 data_watches[i].mask = mask;
 297
 298                                 // insert comparator address
 299                                 sl->q_buf[0] = (addr & 0xff);
 300                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 301                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 302                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 303
 304                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 305
 306                                 // insert mask
 307                                 memset(sl->q_buf, 0, 4);
 308                                 sl->q_buf[0] = mask;
 309                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 310
 311                                 // insert function
 312                                 memset(sl->q_buf, 0, 4);
 313                                 sl->q_buf[0] = wf;
 314                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 315
 316                                 // just to make sure the matched bit is clear !
 317                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 318                                 return 0;
 319                         }
 320                 }
 321         }
 322
 323         #ifdef DEBUG
 324         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 325         #endif
 326         return -1;
 327 }
 328
 329 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 330 {
 331         int i;
 332
 333         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 334                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 335                         #ifdef DEBUG
 336                         printf("delete watchpoint %d addr %x\n", i, addr);
 337                         #endif
 338
 339                         memset(sl->q_buf, 0, 4);
 340                         data_watches[i].fun = WATCHDISABLED;
 341                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 342
 343                         return 0;
 344                 }
 345         }
 346
 347         #ifdef DEBUG
 348         printf("failure: delete watchpoint addr %x\n", addr);
 349         #endif
 350
 351         return -1;
 352 }
 353
 354 #define CODE_BREAK_NUM  6
 355 #define CODE_BREAK_LOW  0x01
 356 #define CODE_BREAK_HIGH 0x02
 357
 358 struct code_hw_breakpoint {
 359         stm32_addr_t addr;
 360         int          type;
 361 };
 362
 363 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 364
 365 static void init_code_breakpoints(stlink_t *sl) {
 366         memset(sl->q_buf, 0, 4);
 367         sl->q_buf[0] = 0x03; // KEY | ENABLE
 368         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 369         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 370         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 371
 372         memset(sl->q_buf, 0, 4);
 373         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 374                 code_breaks[i].type = 0;
 375                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 376         }
 377 }
 378
 379 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 380         stm32_addr_t fpb_addr = addr & ~0x3;
 381         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 382
 383         if(addr & 1) {
 384                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 385                 return -1;
 386         }
 387
 388         int id = -1;
 389         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 390                 if(fpb_addr == code_breaks[i].addr ||
 391                         (set && code_breaks[i].type == 0)) {
 392                         id = i;
 393                         break;
 394                 }
 395         }
 396
 397         if(id == -1) {
 398                 if(set) return -1; // Free slot not found
 399                 else    return 0;  // Breakpoint is already removed
 400         }
 401
 402         struct code_hw_breakpoint* brk = &code_breaks[id];
 403
 404         brk->addr = fpb_addr;
 405
 406         if(set) brk->type |= type;
 407         else    brk->type &= ~type;
 408
 409         memset(sl->q_buf, 0, 4);
 410
 411         if(brk->type == 0) {
 412                 #ifdef DEBUG
 413                 printf("clearing hw break %d\n", id);
 414                 #endif
 415
 416                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 417         } else {
 418                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 419                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 420                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 421                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 422
 423                 #ifdef DEBUG
 424                 printf("setting hw break %d at %08x (%d)\n",
 425                         id, brk->addr, brk->type);
 426                 printf("reg %02x %02x %02x %02x\n",
 427                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 428                 #endif
 429
 430                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 431         }
 432
 433         return 0;
 434 }
 435
 436
 437 struct flash_block {
 438         stm32_addr_t addr;
 439         unsigned     length;
 440         uint8_t*     data;
 441
 442         struct flash_block* next;
 443 };
 444
 445 static struct flash_block* flash_root;
 446
 447 static int flash_add_block(stm32_addr_t addr, unsigned length,
 448                            stlink_t *sl) {
 449         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 450                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 451                 return -1;
 452         }
 453
 454         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 455                 fprintf(stderr, "flash_add_block: unaligned block\n");
 456                 return -1;
 457         }
 458
 459         struct flash_block* new = malloc(sizeof(struct flash_block));
 460         new->next = flash_root;
 461
 462         new->addr   = addr;
 463         new->length = length;
 464         new->data   = calloc(length, 1);
 465
 466         flash_root = new;
 467
 468         return 0;
 469 }
 470
 471 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 472         int fit_blocks = 0, fit_length = 0;
 473
 474         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 475                 /* Block: ------X------Y--------
 476                  * Data:            a-----b
 477                  *                a--b
 478                  *            a-----------b
 479                  * Block intersects with data, if:
 480                  *  a < Y && b > x
 481                  */
 482
 483                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 484                 unsigned a = addr, b = addr + length;
 485                 if(a < Y && b > X) {
 486                         // from start of the block
 487                         unsigned start = (a > X ? a : X) - X;
 488                         unsigned end   = (b > Y ? Y : b) - X;
 489
 490                         memcpy(fb->data + start, data, end - start);
 491
 492                         fit_blocks++;
 493                         fit_length += end - start;
 494                 }
 495         }
 496
 497         if(fit_blocks == 0) {
 498                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 499                 return -1;
 500         }
 501
 502         if(fit_length != length) {
 503                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 504                         addr, length, fit_length);
 505                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int flash_go(stlink_t *sl) {
 512         int error = -1;
 513
 514         // Some kinds of clock settings do not allow writing to flash.
 515         stlink_reset(sl);
 516
 517         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 518                 #ifdef DEBUG
 519                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 520                 #endif
 521
 522                 unsigned length = fb->length;
 523                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 524                         #ifdef DEBUG
 525                         printf("flash_do: page %08x\n", page);
 526                         #endif
 527
 528                         stlink_erase_flash_page(sl, page);
 529
 530                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 531                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 532                                 goto error;
 533                 }
 534
 535         }
 536
 537         stlink_reset(sl);
 538
 539         error = 0;
 540
 541 error:
 542         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 543                 next = fb->next;
 544                 free(fb->data);
 545                 free(fb);
 546         }
 547
 548         flash_root = NULL;
 549
 550         return error;
 551 }
 552
 553 int serve(stlink_t *sl, int port) {
 554         int sock = socket(AF_INET, SOCK_STREAM, 0);
 555         if(sock < 0) {
 556                 perror("socket");
 557                 return 1;
 558         }
 559
 560         unsigned int val = 1;
 561         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 562
 563         struct sockaddr_in serv_addr = {0};
 564         serv_addr.sin_family = AF_INET;
 565         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 566         serv_addr.sin_port = htons(port);
 567
 568         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 569                 perror("bind");
 570                 return 1;
 571         }
 572
 573         if(listen(sock, 5) < 0) {
 574                 perror("listen");
 575                 return 1;
 576         }
 577
 578         stlink_force_debug(sl);
 579         stlink_reset(sl);
 580         init_code_breakpoints(sl);
 581         init_data_watchpoints(sl);
 582
 583         printf("Listening at *:%d...\n", port);
 584
 585         int client = accept(sock, NULL, NULL);
 586         if(client < 0) {
 587                 perror("accept");
 588                 return 1;
 589         }
 590
 591         close(sock);
 592
 593         printf("GDB connected.\n");
 594
 595         /*
 596          * To allow resetting the chip from GDB it is required to
 597          * emulate attaching and detaching to target.
 598          */
 599         unsigned int attached = 1;
 600
 601         while(1) {
 602                 char* packet;
 603
 604                 int status = gdb_recv_packet(client, &packet);
 605                 if(status < 0) {
 606                         fprintf(stderr, "cannot recv: %d\n", status);
 607                         return 1;
 608                 }
 609
 610                 #ifdef DEBUG
 611                 printf("recv: %s\n", packet);
 612                 #endif
 613
 614                 char* reply = NULL;
 615                 reg regp;
 616
 617                 switch(packet[0]) {
 618                 case 'q': {
 619                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 620                                 reply = strdup("");
 621                                 break;
 622                         }
 623
 624                         char *separator = strstr(packet, ":"), *params = "";
 625                         if(separator == NULL) {
 626                                 separator = packet + strlen(packet);
 627                         } else {
 628                                 params = separator + 1;
 629                         }
 630
 631                         unsigned queryNameLength = (separator - &packet[1]);
 632                         char* queryName = calloc(queryNameLength + 1, 1);
 633                         strncpy(queryName, &packet[1], queryNameLength);
 634
 635                         #ifdef DEBUG
 636                         printf("query: %s;%s\n", queryName, params);
 637                         #endif
 638
 639                         if(!strcmp(queryName, "Supported")) {
 640                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 641                         } else if(!strcmp(queryName, "Xfer")) {
 642                                 char *type, *op, *annex, *s_addr, *s_length;
 643                                 char *tok = params;
 644
 645                                 type     = strsep(&tok, ":");
 646                                 op       = strsep(&tok, ":");
 647                                 annex    = strsep(&tok, ":");
 648                                 s_addr   = strsep(&tok, ",");
 649                                 s_length = tok;
 650
 651                                 unsigned addr = strtoul(s_addr, NULL, 16),
 652                                        length = strtoul(s_length, NULL, 16);
 653
 654                                 #ifdef DEBUG
 655                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 656                                         type, op, annex, addr, length);
 657                                 #endif
 658
 659                                 const char* data = NULL;
 660
 661                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 662                                         data = current_memory_map;
 663
 664                                 if(data) {
 665                                         unsigned data_length = strlen(data);
 666                                         if(addr + length > data_length)
 667                                                 length = data_length - addr;
 668
 669                                         if(length == 0) {
 670                                                 reply = strdup("l");
 671                                         } else {
 672                                                 reply = calloc(length + 2, 1);
 673                                                 reply[0] = 'm';
 674                                                 strncpy(&reply[1], data, length);
 675                                         }
 676                                 }
 677                         }
 678
 679                         if(reply == NULL)
 680                                 reply = strdup("");
 681
 682                         free(queryName);
 683
 684                         break;
 685                 }
 686
 687                 case 'v': {
 688                         char *params = NULL;
 689                         char *cmdName = strtok_r(packet, ":;", &params);
 690
 691                         cmdName++; // vCommand -> Command
 692
 693                         if(!strcmp(cmdName, "FlashErase")) {
 694                                 char *s_addr, *s_length;
 695                                 char *tok = params;
 696
 697                                 s_addr   = strsep(&tok, ",");
 698                                 s_length = tok;
 699
 700                                 unsigned addr = strtoul(s_addr, NULL, 16),
 701                                        length = strtoul(s_length, NULL, 16);
 702
 703                                 #ifdef DEBUG
 704                                 printf("FlashErase: addr:%08x,len:%04x\n",
 705                                         addr, length);
 706                                 #endif
 707
 708                                 if(flash_add_block(addr, length, sl) < 0) {
 709                                         reply = strdup("E00");
 710                                 } else {
 711                                         reply = strdup("OK");
 712                                 }
 713                         } else if(!strcmp(cmdName, "FlashWrite")) {
 714                                 char *s_addr, *data;
 715                                 char *tok = params;
 716
 717                                 s_addr = strsep(&tok, ":");
 718                                 data   = tok;
 719
 720                                 unsigned addr = strtoul(s_addr, NULL, 16);
 721                                 unsigned data_length = status - (data - packet);
 722
 723                                 // Length of decoded data cannot be more than
 724                                 // encoded, as escapes are removed.
 725                                 // Additional byte is reserved for alignment fix.
 726                                 uint8_t *decoded = calloc(data_length + 1, 1);
 727                                 unsigned dec_index = 0;
 728                                 for(int i = 0; i < data_length; i++) {
 729                                         if(data[i] == 0x7d) {
 730                                                 i++;
 731                                                 decoded[dec_index++] = data[i] ^ 0x20;
 732                                         } else {
 733                                                 decoded[dec_index++] = data[i];
 734                                         }
 735                                 }
 736
 737                                 // Fix alignment
 738                                 if(dec_index % 2 != 0)
 739                                         dec_index++;
 740
 741                                 #ifdef DEBUG
 742                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 743                                 #endif
 744
 745                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 746                                         reply = strdup("E00");
 747                                 } else {
 748                                         reply = strdup("OK");
 749                                 }
 750                         } else if(!strcmp(cmdName, "FlashDone")) {
 751                                 if(flash_go(sl) < 0) {
 752                                         reply = strdup("E00");
 753                                 } else {
 754                                         reply = strdup("OK");
 755                                 }
 756                         } else if(!strcmp(cmdName, "Kill")) {
 757                                 attached = 0;
 758
 759                                 reply = strdup("OK");
 760                         }
 761
 762                         if(reply == NULL)
 763                                 reply = strdup("");
 764
 765                         break;
 766                 }
 767
 768                 case 'c':
 769                         stlink_run(sl);
 770
 771                         while(1) {
 772                                 int status = gdb_check_for_interrupt(client);
 773                                 if(status < 0) {
 774                                         fprintf(stderr, "cannot check for int: %d\n", status);
 775                                         return 1;
 776                                 }
 777
 778                                 if(status == 1) {
 779                                         stlink_force_debug(sl);
 780                                         break;
 781                                 }
 782
 783                                 stlink_status(sl);
 784                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 785                                         break;
 786                                 }
 787
 788                                 usleep(100000);
 789                         }
 790
 791                         reply = strdup("S05"); // TRAP
 792                         break;
 793
 794                 case 's':
 795                         stlink_step(sl);
 796
 797                         reply = strdup("S05"); // TRAP
 798                         break;
 799
 800                 case '?':
 801                         if(attached) {
 802                                 reply = strdup("S05"); // TRAP
 803                         } else {
 804                                 /* Stub shall reply OK if not attached. */
 805                                 reply = strdup("OK");
 806                         }
 807                         break;
 808
 809                 case 'g':
 810                         stlink_read_all_regs(sl, &regp);
 811
 812                         reply = calloc(8 * 16 + 1, 1);
 813                         for(int i = 0; i < 16; i++)
 814                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 815
 816                         break;
 817
 818                 case 'p': {
 819                         unsigned id = strtoul(&packet[1], NULL, 16);
 820                         unsigned myreg = 0xDEADDEAD;
 821
 822                         if(id < 16) {
 823                                 stlink_read_reg(sl, id, &regp);
 824                                 myreg = htonl(regp.r[id]);
 825                         } else if(id == 0x19) {
 826                                 stlink_read_reg(sl, 16, &regp);
 827                                 myreg = htonl(regp.xpsr);
 828                         } else {
 829                                 reply = strdup("E00");
 830                         }
 831
 832                         reply = calloc(8 + 1, 1);
 833                         sprintf(reply, "%08x", myreg);
 834
 835                         break;
 836                 }
 837
 838                 case 'P': {
 839                         char* s_reg = &packet[1];
 840                         char* s_value = strstr(&packet[1], "=") + 1;
 841
 842                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 843                         unsigned value = strtoul(s_value, NULL, 16);
 844
 845                         if(reg < 16) {
 846                                 stlink_write_reg(sl, ntohl(value), reg);
 847                         } else if(reg == 0x19) {
 848                                 stlink_write_reg(sl, ntohl(value), 16);
 849                         } else {
 850                                 reply = strdup("E00");
 851                         }
 852
 853                         if(!reply) {
 854                                 reply = strdup("OK");
 855                         }
 856
 857                         break;
 858                 }
 859
 860                 case 'G':
 861                         for(int i = 0; i < 16; i++) {
 862                                 char str[9] = {0};
 863                                 strncpy(str, &packet[1 + i * 8], 8);
 864                                 uint32_t reg = strtoul(str, NULL, 16);
 865                                 stlink_write_reg(sl, ntohl(reg), i);
 866                         }
 867
 868                         reply = strdup("OK");
 869                         break;
 870
 871                 case 'm': {
 872                         char* s_start = &packet[1];
 873                         char* s_count = strstr(&packet[1], ",") + 1;
 874
 875                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 876                         unsigned     count = strtoul(s_count, NULL, 16);
 877
 878                         unsigned adj_start = start % 4;
 879
 880                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 881                                                 count : count + 4 - (count % 4));
 882
 883                         reply = calloc(count * 2 + 1, 1);
 884                         for(int i = 0; i < count; i++) {
 885                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 886                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 887                         }
 888
 889                         break;
 890                 }
 891
 892                 case 'M': {
 893                         char* s_start = &packet[1];
 894                         char* s_count = strstr(&packet[1], ",") + 1;
 895                         char* hexdata = strstr(packet, ":") + 1;
 896
 897                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 898                         unsigned     count = strtoul(s_count, NULL, 16);
 899
 900                         for(int i = 0; i < count; i ++) {
 901                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 902                                 uint8_t byte = strtoul(hex, NULL, 16);
 903                                 sl->q_buf[i] = byte;
 904                         }
 905
 906                         if((count % 4) == 0 && (start % 4) == 0) {
 907                                 stlink_write_mem32(sl, start, count);
 908                         } else {
 909                                 stlink_write_mem8(sl, start, count);
 910                         }
 911
 912                         reply = strdup("OK");
 913
 914                         break;
 915                 }
 916
 917                 case 'Z': {
 918                         char *endptr;
 919                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 920                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 921
 922                         switch (packet[1]) {
 923                                 case '1':
 924                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 925                                         reply = strdup("E00");
 926                                 } else {
 927                                         reply = strdup("OK");
 928                                 }
 929                                 break;
 930
 931                                 case '2':   // insert write watchpoint
 932                                 case '3':   // insert read  watchpoint
 933                                 case '4':   // insert access watchpoint
 934                                 {
 935                                         enum watchfun wf;
 936                                         if(packet[1] == '2') {
 937                                                 wf = WATCHWRITE;
 938                                         } else if(packet[1] == '3') {
 939                                                 wf = WATCHREAD;
 940                                         } else {
 941                                                 wf = WATCHACCESS;
 942                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 943                                                         reply = strdup("E00");
 944                                                 } else {
 945                                                         reply = strdup("OK");
 946                                                         break;
 947                                                 }
 948                                         }
 949                                 }
 950
 951                                 default:
 952                                 reply = strdup("");
 953                         }
 954                         break;
 955                 }
 956                 case 'z': {
 957                         char *endptr;
 958                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 959                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 960
 961                         switch (packet[1]) {
 962                                 case '1': // remove breakpoint
 963                                 update_code_breakpoint(sl, addr, 0);
 964                                 reply = strdup("OK");
 965                                 break;
 966
 967                                 case '2' : // remove write watchpoint
 968                                 case '3' : // remove read watchpoint
 969                                 case '4' : // remove access watchpoint
 970                                 if(delete_data_watchpoint(sl, addr) < 0) {
 971                                         reply = strdup("E00");
 972                                 } else {
 973                                         reply = strdup("OK");
 974                                         break;
 975                                 }
 976
 977                                 default:
 978                                 reply = strdup("");
 979                         }
 980                         break;
 981                 }
 982
 983                 case '!': {
 984                         /*
 985                          * Enter extended mode which allows restarting.
 986                          * We do support that always.
 987                          */
 988
 989                         reply = strdup("OK");
 990
 991                         break;
 992                 }
 993
 994                 case 'R': {
 995                         /* Reset the core. */
 996
 997                         stlink_reset(sl);
 998                         init_code_breakpoints(sl);
 999                         init_data_watchpoints(sl);
1000
1001                         attached = 1;
1002
1003                         reply = strdup("OK");
1004
1005                         break;
1006                 }
1007
1008                 default:
1009                         reply = strdup("");
1010                 }
1011
1012                 if(reply) {
1013                         #ifdef DEBUG
1014                         printf("send: %s\n", reply);
1015                         #endif
1016
1017                         int result = gdb_send_packet(client, reply);
1018                         if(result != 0) {
1019                                 fprintf(stderr, "cannot send: %d\n", result);
1020                                 return 1;
1021                         }
1022
1023                         free(reply);
1024                 }
1025
1026                 free(packet);
1027         }
1028
1029         return 0;
1030 }