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
  36 #define CORE_M3_R1 0x1BA00477
  37 #define CORE_M3_R2 0x4BA00477
  38 #define CORE_M4_R0 0x2BA01477
  39
  40 struct chip_params {
  41         uint32_t chip_id;
  42         char* description;
  43         uint32_t flash_size_reg;
  44         uint32_t max_flash_size, flash_pagesize;
  45         uint32_t sram_size;
  46         uint32_t bootrom_base, bootrom_size;
  47 } const devices[] = {
  48         { 0x410, "F1 Medium-density device", 0x1ffff7e0,
  49           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  }, // table 2, pm0063
  50         { 0x411, "F2 device", 0, /* No flash size register found in the docs*/
  51           0x100000,   0x20000, 0x20000, 0x1fff0000, 0x7800  }, // table 1, pm0059
  52         { 0x412, "F1 Low-density device", 0x1ffff7e0,
  53           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  }, // table 1, pm0063
  54         { 0x413, "F4 device", 0x1FFF7A10,
  55           0x100000,   0x20000, 0x20000,  0x1fff0000, 0x7800  }, // table 1, pm0081
  56         { 0x414, "F1 High-density device", 0x1ffff7e0,
  57           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },  // table 3 pm0063
  58           // This ignores the EEPROM! (and uses the page erase size,
  59           // not the sector write protection...)
  60         { 0x416, "L1 Med-density device", 0x1FF8004C, // table 1, pm0062
  61           0x20000, 0x100, 0x4000, 0x1ff00000, 0x1000 },
  62         { 0x418, "F1 Connectivity line device", 0x1ffff7e0,
  63           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  64         { 0x420, "F1 Medium-density value line device", 0x1ffff7e0,
  65           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  66         { 0x428, "F1 High-density value line device", 0x1ffff7e0,
  67           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  68         { 0x430, "F1 XL-density device", 0x1ffff7e0,  // pm0068
  69           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  70         { 0 }
  71 };
  72
  73 int serve(stlink_t *sl, int port);
  74 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  75
  76 int main(int argc, char** argv) {
  77
  78         stlink_t *sl = NULL;
  79
  80         const char * HelpStr =  "Usage:\n"
  81                                                                 "\t st-util port [/dev/sgX]\n"
  82                                                                 "\t st-util [port]\n"
  83                                                                 "\t st-util --help\n";
  84
  85         switch(argc) {
  86
  87                 default: {
  88                         fprintf(stderr, HelpStr, NULL);
  89                         return 1;
  90                 }
  91
  92                 case 3 : {
  93                         //sl = stlink_quirk_open(argv[2], 0);
  94                         // FIXME - hardcoded to usb....
  95                         sl = stlink_open_usb(10);
  96                         if(sl == NULL) return 1;
  97                         break;
  98                 }
  99
 100                 case 2 : {
 101                         if (strcmp(argv[1], "--help") == 0) {
 102                                 fprintf(stdout, HelpStr, NULL);
 103                                 return 1;
 104                         }
 105                 }
 106
 107                 case 1 : { // Search ST-LINK (from /dev/sg0 to /dev/sg99)
 108                         const int DevNumMax = 99;
 109                         int ExistDevCount = 0;
 110
 111                         for(int DevNum = 0; DevNum <= DevNumMax; DevNum++)
 112                         {
 113                                 if(DevNum < 10) {
 114                                         char DevName[] = "/dev/sgX";
 115                                         const int X_index = 7;
 116                                         DevName[X_index] = DevNum + '0';
 117                                         if ( !access(DevName, F_OK) ) {
 118                                                 sl = stlink_quirk_open(DevName, 0);
 119                                                 ExistDevCount++;
 120                                         }
 121                                 }
 122                                 else if(DevNum < 100) {
 123                                         char DevName[] = "/dev/sgXY";
 124                                         const int X_index = 7;
 125                                         const int Y_index = 8;
 126                                         DevName[X_index] = DevNum/10 + '0';
 127                                         DevName[Y_index] = DevNum%10 + '0';
 128                                         if ( !access(DevName, F_OK) ) {
 129                                                 sl = stlink_quirk_open(DevName, 0);
 130                                                 ExistDevCount++;
 131                                         }
 132                                 }
 133                                 if(sl != NULL) break;
 134                         }
 135
 136                         if(sl == NULL) {
 137                                 fprintf(stdout, "\nNumber of /dev/sgX devices found: %i \n",
 138                                                 ExistDevCount);
 139                                 fprintf(stderr, "ST-LINK not found\n");
 140                                 return 1;
 141                         }
 142                         break;
 143                 }
 144         }
 145
 146         if (stlink_current_mode(sl) == STLINK_DEV_DFU_MODE) {
 147             stlink_exit_dfu_mode(sl);
 148         }
 149
 150         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE) {
 151           stlink_enter_swd_mode(sl);
 152         }
 153
 154         uint32_t chip_id = stlink_chip_id(sl);
 155         uint32_t core_id = stlink_core_id(sl);
 156
 157         /* Fix chip_id for F4 */
 158         if (((chip_id & 0xFFF) == 0x411) && (core_id == CORE_M4_R0)) {
 159           printf("Fixing wrong chip_id for STM32F4 Rev A errata\n");
 160           chip_id = 0x413;
 161         }
 162
 163         printf("Chip ID is %08x, Core ID is  %08x.\n", chip_id, core_id);
 164
 165         const struct chip_params* params = NULL;
 166
 167         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
 168                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
 169                         params = &devices[i];
 170                         break;
 171                 }
 172         }
 173
 174         if(params == NULL) {
 175                 fprintf(stderr, "Cannot recognize the connected device!\n");
 176                 return 0;
 177         }
 178
 179         printf("Device connected: %s\n", params->description);
 180         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 181                 params->sram_size, params->max_flash_size, params->flash_pagesize);
 182
 183         FLASH_PAGE = params->flash_pagesize;
 184
 185         uint32_t flash_size;
 186
 187         stlink_read_mem32(sl, params->flash_size_reg, 4);
 188         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 189
 190         printf("Flash size is %d KiB.\n", flash_size);
 191         // memory map is in 1k blocks.
 192         current_memory_map = make_memory_map(params, flash_size * 0x400);
 193
 194         int port = 4242;
 195
 196         while(serve(sl, port) == 0);
 197
 198         stlink_close(sl);
 199
 200         return 0;
 201 }
 202
 203 static const char* const memory_map_template =
 204   "<?xml version=\"1.0\"?>"
 205   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 206   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 207   "<memory-map>"
 208   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 209   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 210   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 211   "    <property name=\"blocksize\">0x%x</property>"
 212   "  </memory>"
 213   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 214   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 215   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 216   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 217   "</memory-map>";
 218
 219 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 220         /* This will be freed in serve() */
 221         char* map = malloc(4096);
 222         map[0] = '\0';
 223
 224         snprintf(map, 4096, memory_map_template,
 225                         flash_size,
 226                         params->sram_size,
 227                         flash_size, params->flash_pagesize,
 228                         params->bootrom_base, params->bootrom_size);
 229
 230         return map;
 231 }
 232
 233
 234 /*
 235  * DWT_COMP0     0xE0001020
 236  * DWT_MASK0     0xE0001024
 237  * DWT_FUNCTION0 0xE0001028
 238  * DWT_COMP1     0xE0001030
 239  * DWT_MASK1     0xE0001034
 240  * DWT_FUNCTION1 0xE0001038
 241  * DWT_COMP2     0xE0001040
 242  * DWT_MASK2     0xE0001044
 243  * DWT_FUNCTION2 0xE0001048
 244  * DWT_COMP3     0xE0001050
 245  * DWT_MASK3     0xE0001054
 246  * DWT_FUNCTION3 0xE0001058
 247  */
 248
 249 #define DATA_WATCH_NUM 4
 250
 251 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 252
 253 struct code_hw_watchpoint {
 254         stm32_addr_t addr;
 255         uint8_t mask;
 256         enum watchfun fun;
 257 };
 258
 259 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 260
 261 static void init_data_watchpoints(stlink_t *sl) {
 262         #ifdef DEBUG
 263         printf("init watchpoints\n");
 264         #endif
 265
 266         // set trcena in debug command to turn on dwt unit
 267         stlink_read_mem32(sl, 0xE000EDFC, 4);
 268         sl->q_buf[3] |= 1;
 269         stlink_write_mem32(sl, 0xE000EDFC, 4);
 270
 271         // make sure all watchpoints are cleared
 272         memset(sl->q_buf, 0, 4);
 273         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 274                 data_watches[i].fun = WATCHDISABLED;
 275                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 276         }
 277 }
 278
 279 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 280 {
 281         int i = 0;
 282         uint32_t mask;
 283
 284         // computer mask
 285         // find a free watchpoint
 286         // configure
 287
 288         mask = -1;
 289         i = len;
 290         while(i) {
 291                 i >>= 1;
 292                 mask++;
 293         }
 294
 295         if((mask != -1) && (mask < 16)) {
 296                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 297                         // is this an empty slot ?
 298                         if(data_watches[i].fun == WATCHDISABLED) {
 299                                 #ifdef DEBUG
 300                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 301                                 #endif
 302
 303                                 data_watches[i].fun = wf;
 304                                 data_watches[i].addr = addr;
 305                                 data_watches[i].mask = mask;
 306
 307                                 // insert comparator address
 308                                 sl->q_buf[0] = (addr & 0xff);
 309                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 310                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 311                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 312
 313                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 314
 315                                 // insert mask
 316                                 memset(sl->q_buf, 0, 4);
 317                                 sl->q_buf[0] = mask;
 318                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 319
 320                                 // insert function
 321                                 memset(sl->q_buf, 0, 4);
 322                                 sl->q_buf[0] = wf;
 323                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 324
 325                                 // just to make sure the matched bit is clear !
 326                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 327                                 return 0;
 328                         }
 329                 }
 330         }
 331
 332         #ifdef DEBUG
 333         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 334         #endif
 335         return -1;
 336 }
 337
 338 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 339 {
 340         int i;
 341
 342         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 343                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 344                         #ifdef DEBUG
 345                         printf("delete watchpoint %d addr %x\n", i, addr);
 346                         #endif
 347
 348                         memset(sl->q_buf, 0, 4);
 349                         data_watches[i].fun = WATCHDISABLED;
 350                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 351
 352                         return 0;
 353                 }
 354         }
 355
 356         #ifdef DEBUG
 357         printf("failure: delete watchpoint addr %x\n", addr);
 358         #endif
 359
 360         return -1;
 361 }
 362
 363 #define CODE_BREAK_NUM  6
 364 #define CODE_BREAK_LOW  0x01
 365 #define CODE_BREAK_HIGH 0x02
 366
 367 struct code_hw_breakpoint {
 368         stm32_addr_t addr;
 369         int          type;
 370 };
 371
 372 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 373
 374 static void init_code_breakpoints(stlink_t *sl) {
 375         memset(sl->q_buf, 0, 4);
 376         sl->q_buf[0] = 0x03; // KEY | ENABLE
 377         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 378         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 379         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 380
 381         memset(sl->q_buf, 0, 4);
 382         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 383                 code_breaks[i].type = 0;
 384                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 385         }
 386 }
 387
 388 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 389         stm32_addr_t fpb_addr = addr & ~0x3;
 390         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 391
 392         if(addr & 1) {
 393                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 394                 return -1;
 395         }
 396
 397         int id = -1;
 398         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 399                 if(fpb_addr == code_breaks[i].addr ||
 400                         (set && code_breaks[i].type == 0)) {
 401                         id = i;
 402                         break;
 403                 }
 404         }
 405
 406         if(id == -1) {
 407                 if(set) return -1; // Free slot not found
 408                 else    return 0;  // Breakpoint is already removed
 409         }
 410
 411         struct code_hw_breakpoint* brk = &code_breaks[id];
 412
 413         brk->addr = fpb_addr;
 414
 415         if(set) brk->type |= type;
 416         else    brk->type &= ~type;
 417
 418         memset(sl->q_buf, 0, 4);
 419
 420         if(brk->type == 0) {
 421                 #ifdef DEBUG
 422                 printf("clearing hw break %d\n", id);
 423                 #endif
 424
 425                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 426         } else {
 427                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 428                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 429                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 430                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 431
 432                 #ifdef DEBUG
 433                 printf("setting hw break %d at %08x (%d)\n",
 434                         id, brk->addr, brk->type);
 435                 printf("reg %02x %02x %02x %02x\n",
 436                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 437                 #endif
 438
 439                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 440         }
 441
 442         return 0;
 443 }
 444
 445
 446 struct flash_block {
 447         stm32_addr_t addr;
 448         unsigned     length;
 449         uint8_t*     data;
 450
 451         struct flash_block* next;
 452 };
 453
 454 static struct flash_block* flash_root;
 455
 456 static int flash_add_block(stm32_addr_t addr, unsigned length,
 457                            stlink_t *sl) {
 458         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 459                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 460                 return -1;
 461         }
 462
 463         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 464                 fprintf(stderr, "flash_add_block: unaligned block\n");
 465                 return -1;
 466         }
 467
 468         struct flash_block* new = malloc(sizeof(struct flash_block));
 469         new->next = flash_root;
 470
 471         new->addr   = addr;
 472         new->length = length;
 473         new->data   = calloc(length, 1);
 474
 475         flash_root = new;
 476
 477         return 0;
 478 }
 479
 480 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 481         int fit_blocks = 0, fit_length = 0;
 482
 483         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 484                 /* Block: ------X------Y--------
 485                  * Data:            a-----b
 486                  *                a--b
 487                  *            a-----------b
 488                  * Block intersects with data, if:
 489                  *  a < Y && b > x
 490                  */
 491
 492                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 493                 unsigned a = addr, b = addr + length;
 494                 if(a < Y && b > X) {
 495                         // from start of the block
 496                         unsigned start = (a > X ? a : X) - X;
 497                         unsigned end   = (b > Y ? Y : b) - X;
 498
 499                         memcpy(fb->data + start, data, end - start);
 500
 501                         fit_blocks++;
 502                         fit_length += end - start;
 503                 }
 504         }
 505
 506         if(fit_blocks == 0) {
 507                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 508                 return -1;
 509         }
 510
 511         if(fit_length != length) {
 512                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 513                         addr, length, fit_length);
 514                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int flash_go(stlink_t *sl) {
 521         int error = -1;
 522
 523         // Some kinds of clock settings do not allow writing to flash.
 524         stlink_reset(sl);
 525
 526         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 527                 #ifdef DEBUG
 528                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 529                 #endif
 530
 531                 unsigned length = fb->length;
 532                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 533                         #ifdef DEBUG
 534                         printf("flash_do: page %08x\n", page);
 535                         #endif
 536
 537                         stlink_erase_flash_page(sl, page);
 538
 539                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 540                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 541                                 goto error;
 542                 }
 543
 544         }
 545
 546         stlink_reset(sl);
 547
 548         error = 0;
 549
 550 error:
 551         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 552                 next = fb->next;
 553                 free(fb->data);
 554                 free(fb);
 555         }
 556
 557         flash_root = NULL;
 558
 559         return error;
 560 }
 561
 562 int serve(stlink_t *sl, int port) {
 563         int sock = socket(AF_INET, SOCK_STREAM, 0);
 564         if(sock < 0) {
 565                 perror("socket");
 566                 return 1;
 567         }
 568
 569         unsigned int val = 1;
 570         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 571
 572         struct sockaddr_in serv_addr = {0};
 573         serv_addr.sin_family = AF_INET;
 574         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 575         serv_addr.sin_port = htons(port);
 576
 577         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 578                 perror("bind");
 579                 return 1;
 580         }
 581
 582         if(listen(sock, 5) < 0) {
 583                 perror("listen");
 584                 return 1;
 585         }
 586
 587         stlink_force_debug(sl);
 588         stlink_reset(sl);
 589         init_code_breakpoints(sl);
 590         init_data_watchpoints(sl);
 591
 592         printf("Listening at *:%d...\n", port);
 593
 594         int client = accept(sock, NULL, NULL);
 595         if(client < 0) {
 596                 perror("accept");
 597                 return 1;
 598         }
 599
 600         close(sock);
 601
 602         printf("GDB connected.\n");
 603
 604         /*
 605          * To allow resetting the chip from GDB it is required to
 606          * emulate attaching and detaching to target.
 607          */
 608         unsigned int attached = 1;
 609
 610         while(1) {
 611                 char* packet;
 612
 613                 int status = gdb_recv_packet(client, &packet);
 614                 if(status < 0) {
 615                         fprintf(stderr, "cannot recv: %d\n", status);
 616                         return 1;
 617                 }
 618
 619                 #ifdef DEBUG
 620                 printf("recv: %s\n", packet);
 621                 #endif
 622
 623                 char* reply = NULL;
 624                 reg regp;
 625
 626                 switch(packet[0]) {
 627                 case 'q': {
 628                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 629                                 reply = strdup("");
 630                                 break;
 631                         }
 632
 633                         char *separator = strstr(packet, ":"), *params = "";
 634                         if(separator == NULL) {
 635                                 separator = packet + strlen(packet);
 636                         } else {
 637                                 params = separator + 1;
 638                         }
 639
 640                         unsigned queryNameLength = (separator - &packet[1]);
 641                         char* queryName = calloc(queryNameLength + 1, 1);
 642                         strncpy(queryName, &packet[1], queryNameLength);
 643
 644                         #ifdef DEBUG
 645                         printf("query: %s;%s\n", queryName, params);
 646                         #endif
 647
 648                         if(!strcmp(queryName, "Supported")) {
 649                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 650                         } else if(!strcmp(queryName, "Xfer")) {
 651                                 char *type, *op, *s_addr, *s_length;
 652                                 char *tok = params;
 653                                 char *annex __attribute__((unused));
 654
 655                                 type     = strsep(&tok, ":");
 656                                 op       = strsep(&tok, ":");
 657                                 annex    = strsep(&tok, ":");
 658                                 s_addr   = strsep(&tok, ",");
 659                                 s_length = tok;
 660
 661                                 unsigned addr = strtoul(s_addr, NULL, 16),
 662                                        length = strtoul(s_length, NULL, 16);
 663
 664                                 #ifdef DEBUG
 665                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 666                                         type, op, annex, addr, length);
 667                                 #endif
 668
 669                                 const char* data = NULL;
 670
 671                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 672                                         data = current_memory_map;
 673
 674                                 if(data) {
 675                                         unsigned data_length = strlen(data);
 676                                         if(addr + length > data_length)
 677                                                 length = data_length - addr;
 678
 679                                         if(length == 0) {
 680                                                 reply = strdup("l");
 681                                         } else {
 682                                                 reply = calloc(length + 2, 1);
 683                                                 reply[0] = 'm';
 684                                                 strncpy(&reply[1], data, length);
 685                                         }
 686                                 }
 687                         }
 688
 689                         if(reply == NULL)
 690                                 reply = strdup("");
 691
 692                         free(queryName);
 693
 694                         break;
 695                 }
 696
 697                 case 'v': {
 698                         char *params = NULL;
 699                         char *cmdName = strtok_r(packet, ":;", &params);
 700
 701                         cmdName++; // vCommand -> Command
 702
 703                         if(!strcmp(cmdName, "FlashErase")) {
 704                                 char *s_addr, *s_length;
 705                                 char *tok = params;
 706
 707                                 s_addr   = strsep(&tok, ",");
 708                                 s_length = tok;
 709
 710                                 unsigned addr = strtoul(s_addr, NULL, 16),
 711                                        length = strtoul(s_length, NULL, 16);
 712
 713                                 #ifdef DEBUG
 714                                 printf("FlashErase: addr:%08x,len:%04x\n",
 715                                         addr, length);
 716                                 #endif
 717
 718                                 if(flash_add_block(addr, length, sl) < 0) {
 719                                         reply = strdup("E00");
 720                                 } else {
 721                                         reply = strdup("OK");
 722                                 }
 723                         } else if(!strcmp(cmdName, "FlashWrite")) {
 724                                 char *s_addr, *data;
 725                                 char *tok = params;
 726
 727                                 s_addr = strsep(&tok, ":");
 728                                 data   = tok;
 729
 730                                 unsigned addr = strtoul(s_addr, NULL, 16);
 731                                 unsigned data_length = status - (data - packet);
 732
 733                                 // Length of decoded data cannot be more than
 734                                 // encoded, as escapes are removed.
 735                                 // Additional byte is reserved for alignment fix.
 736                                 uint8_t *decoded = calloc(data_length + 1, 1);
 737                                 unsigned dec_index = 0;
 738                                 for(int i = 0; i < data_length; i++) {
 739                                         if(data[i] == 0x7d) {
 740                                                 i++;
 741                                                 decoded[dec_index++] = data[i] ^ 0x20;
 742                                         } else {
 743                                                 decoded[dec_index++] = data[i];
 744                                         }
 745                                 }
 746
 747                                 // Fix alignment
 748                                 if(dec_index % 2 != 0)
 749                                         dec_index++;
 750
 751                                 #ifdef DEBUG
 752                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 753                                 #endif
 754
 755                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 756                                         reply = strdup("E00");
 757                                 } else {
 758                                         reply = strdup("OK");
 759                                 }
 760                         } else if(!strcmp(cmdName, "FlashDone")) {
 761                                 if(flash_go(sl) < 0) {
 762                                         reply = strdup("E00");
 763                                 } else {
 764                                         reply = strdup("OK");
 765                                 }
 766                         } else if(!strcmp(cmdName, "Kill")) {
 767                                 attached = 0;
 768
 769                                 reply = strdup("OK");
 770                         }
 771
 772                         if(reply == NULL)
 773                                 reply = strdup("");
 774
 775                         break;
 776                 }
 777
 778                 case 'c':
 779                         stlink_run(sl);
 780
 781                         while(1) {
 782                                 int status = gdb_check_for_interrupt(client);
 783                                 if(status < 0) {
 784                                         fprintf(stderr, "cannot check for int: %d\n", status);
 785                                         return 1;
 786                                 }
 787
 788                                 if(status == 1) {
 789                                         stlink_force_debug(sl);
 790                                         break;
 791                                 }
 792
 793                                 stlink_status(sl);
 794                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 795                                         break;
 796                                 }
 797
 798                                 usleep(100000);
 799                         }
 800
 801                         reply = strdup("S05"); // TRAP
 802                         break;
 803
 804                 case 's':
 805                         stlink_step(sl);
 806
 807                         reply = strdup("S05"); // TRAP
 808                         break;
 809
 810                 case '?':
 811                         if(attached) {
 812                                 reply = strdup("S05"); // TRAP
 813                         } else {
 814                                 /* Stub shall reply OK if not attached. */
 815                                 reply = strdup("OK");
 816                         }
 817                         break;
 818
 819                 case 'g':
 820                         stlink_read_all_regs(sl, &regp);
 821
 822                         reply = calloc(8 * 16 + 1, 1);
 823                         for(int i = 0; i < 16; i++)
 824                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 825
 826                         break;
 827
 828                 case 'p': {
 829                         unsigned id = strtoul(&packet[1], NULL, 16);
 830                         unsigned myreg = 0xDEADDEAD;
 831
 832                         if(id < 16) {
 833                                 stlink_read_reg(sl, id, &regp);
 834                                 myreg = htonl(regp.r[id]);
 835                         } else if(id == 0x19) {
 836                                 stlink_read_reg(sl, 16, &regp);
 837                                 myreg = htonl(regp.xpsr);
 838                         } else {
 839                                 reply = strdup("E00");
 840                         }
 841
 842                         reply = calloc(8 + 1, 1);
 843                         sprintf(reply, "%08x", myreg);
 844
 845                         break;
 846                 }
 847
 848                 case 'P': {
 849                         char* s_reg = &packet[1];
 850                         char* s_value = strstr(&packet[1], "=") + 1;
 851
 852                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 853                         unsigned value = strtoul(s_value, NULL, 16);
 854
 855                         if(reg < 16) {
 856                                 stlink_write_reg(sl, ntohl(value), reg);
 857                         } else if(reg == 0x19) {
 858                                 stlink_write_reg(sl, ntohl(value), 16);
 859                         } else {
 860                                 reply = strdup("E00");
 861                         }
 862
 863                         if(!reply) {
 864                                 reply = strdup("OK");
 865                         }
 866
 867                         break;
 868                 }
 869
 870                 case 'G':
 871                         for(int i = 0; i < 16; i++) {
 872                                 char str[9] = {0};
 873                                 strncpy(str, &packet[1 + i * 8], 8);
 874                                 uint32_t reg = strtoul(str, NULL, 16);
 875                                 stlink_write_reg(sl, ntohl(reg), i);
 876                         }
 877
 878                         reply = strdup("OK");
 879                         break;
 880
 881                 case 'm': {
 882                         char* s_start = &packet[1];
 883                         char* s_count = strstr(&packet[1], ",") + 1;
 884
 885                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 886                         unsigned     count = strtoul(s_count, NULL, 16);
 887
 888                         unsigned adj_start = start % 4;
 889
 890                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 891                                                 count : count + 4 - (count % 4));
 892
 893                         reply = calloc(count * 2 + 1, 1);
 894                         for(int i = 0; i < count; i++) {
 895                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 896                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 897                         }
 898
 899                         break;
 900                 }
 901
 902                 case 'M': {
 903                         char* s_start = &packet[1];
 904                         char* s_count = strstr(&packet[1], ",") + 1;
 905                         char* hexdata = strstr(packet, ":") + 1;
 906
 907                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 908                         unsigned     count = strtoul(s_count, NULL, 16);
 909
 910                         for(int i = 0; i < count; i ++) {
 911                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 912                                 uint8_t byte = strtoul(hex, NULL, 16);
 913                                 sl->q_buf[i] = byte;
 914                         }
 915
 916                         if((count % 4) == 0 && (start % 4) == 0) {
 917                                 stlink_write_mem32(sl, start, count);
 918                         } else {
 919                                 stlink_write_mem8(sl, start, count);
 920                         }
 921
 922                         reply = strdup("OK");
 923
 924                         break;
 925                 }
 926
 927                 case 'Z': {
 928                         char *endptr;
 929                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 930                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 931
 932                         switch (packet[1]) {
 933                                 case '1':
 934                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 935                                         reply = strdup("E00");
 936                                 } else {
 937                                         reply = strdup("OK");
 938                                 }
 939                                 break;
 940
 941                                 case '2':   // insert write watchpoint
 942                                 case '3':   // insert read  watchpoint
 943                                 case '4':   // insert access watchpoint
 944                                 {
 945                                         enum watchfun wf;
 946                                         if(packet[1] == '2') {
 947                                                 wf = WATCHWRITE;
 948                                         } else if(packet[1] == '3') {
 949                                                 wf = WATCHREAD;
 950                                         } else {
 951                                                 wf = WATCHACCESS;
 952                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 953                                                         reply = strdup("E00");
 954                                                 } else {
 955                                                         reply = strdup("OK");
 956                                                         break;
 957                                                 }
 958                                         }
 959                                 }
 960
 961                                 default:
 962                                 reply = strdup("");
 963                         }
 964                         break;
 965                 }
 966                 case 'z': {
 967                         char *endptr;
 968                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 969                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 970
 971                         switch (packet[1]) {
 972                                 case '1': // remove breakpoint
 973                                 update_code_breakpoint(sl, addr, 0);
 974                                 reply = strdup("OK");
 975                                 break;
 976
 977                                 case '2' : // remove write watchpoint
 978                                 case '3' : // remove read watchpoint
 979                                 case '4' : // remove access watchpoint
 980                                 if(delete_data_watchpoint(sl, addr) < 0) {
 981                                         reply = strdup("E00");
 982                                 } else {
 983                                         reply = strdup("OK");
 984                                         break;
 985                                 }
 986
 987                                 default:
 988                                 reply = strdup("");
 989                         }
 990                         break;
 991                 }
 992
 993                 case '!': {
 994                         /*
 995                          * Enter extended mode which allows restarting.
 996                          * We do support that always.
 997                          */
 998
 999                         reply = strdup("OK");
1000
1001                         break;
1002                 }
1003
1004                 case 'R': {
1005                         /* Reset the core. */
1006
1007                         stlink_reset(sl);
1008                         init_code_breakpoints(sl);
1009                         init_data_watchpoints(sl);
1010
1011                         attached = 1;
1012
1013                         reply = strdup("OK");
1014
1015                         break;
1016                 }
1017
1018                 default:
1019                         reply = strdup("");
1020                 }
1021
1022                 if(reply) {
1023                         #ifdef DEBUG
1024                         printf("send: %s\n", reply);
1025                         #endif
1026
1027                         int result = gdb_send_packet(client, reply);
1028                         if(result != 0) {
1029                                 fprintf(stderr, "cannot send: %d\n", result);
1030                                 return 1;
1031                         }
1032
1033                         free(reply);
1034                 }
1035
1036                 free(packet);
1037         }
1038
1039         return 0;
1040 }