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