git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

   1 /* -*- tab-width:8 -*- */
   2 #define DEBUG 0
   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 <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <signal.h>
  19
  20 #include <stlink-common.h>
  21
  22 #include "gdb-remote.h"
  23
  24 #define DEFAULT_LOGGING_LEVEL 50
  25 #define DEFAULT_GDB_LISTEN_PORT 4242
  26
  27 #define STRINGIFY_inner(name) #name
  28 #define STRINGIFY(name) STRINGIFY_inner(name)
  29
  30 #define FLASH_BASE 0x08000000
  31
  32 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  33 #define FLASH_PAGE (sl->flash_pgsz)
  34
  35 static const char hex[] = "0123456789abcdef";
  36
  37 static const char* current_memory_map = NULL;
  38
  39 typedef struct _st_state_t {
  40     // things from command line, bleh
  41     int stlink_version;
  42     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  43     char devicename[100];
  44     int logging_level;
  45         int listen_port;
  46 } st_state_t;
  47
  48
  49 int serve(stlink_t *sl, int port);
  50 char* make_memory_map(stlink_t *sl);
  51
  52
  53 int parse_options(int argc, char** argv, st_state_t *st) {
  54     static struct option long_options[] = {
  55         {"help", no_argument, NULL, 'h'},
  56         {"verbose", optional_argument, NULL, 'v'},
  57         {"device", required_argument, NULL, 'd'},
  58         {"stlink_version", required_argument, NULL, 's'},
  59         {"stlinkv1", no_argument, NULL, '1'},
  60                 {"listen_port", required_argument, NULL, 'p'},
  61         {0, 0, 0, 0},
  62     };
  63         const char * help_str = "%s - usage:\n\n"
  64         "  -h, --help\t\tPrint this help\n"
  65         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  66         "  -v, --verbose\tspecify generally verbose logging\n"
  67         "  -d <device>, --device=/dev/stlink2_1\n"
  68         "\t\t\tWhere is your stlink device connected?\n"
  69         "  -s X, --stlink_version=X\n"
  70         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  71         "  -1, --stlinkv1\tForce stlink version 1\n"
  72         "  -p 4242, --listen_port=1234\n"
  73         "\t\t\tSet the gdb server listen port. "
  74         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  75         ;
  76
  77
  78     int option_index = 0;
  79     int c;
  80     int q;
  81     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  82         switch (c) {
  83         case 0:
  84             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  85             printf("option %s", long_options[option_index].name);
  86             if (optarg) {
  87                 printf(" with arg %s", optarg);
  88             }
  89             printf("\n");
  90             break;
  91         case 'h':
  92             printf(help_str, argv[0]);
  93             exit(EXIT_SUCCESS);
  94             break;
  95         case 'v':
  96             if (optarg) {
  97                 st->logging_level = atoi(optarg);
  98             } else {
  99                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 100             }
 101             break;
 102         case 'd':
 103             if (strlen(optarg) > sizeof (st->devicename)) {
 104                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 105             } else {
 106                 strcpy(st->devicename, optarg);
 107             }
 108             break;
 109                 case '1':
 110                         st->stlink_version = 1;
 111                         break;
 112                 case 's':
 113                         sscanf(optarg, "%i", &q);
 114                         if (q < 0 || q > 2) {
 115                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 116                                 exit(EXIT_FAILURE);
 117                         }
 118                         st->stlink_version = q;
 119                         break;
 120                 case 'p':
 121                         sscanf(optarg, "%i", &q);
 122                         if (q < 0) {
 123                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 124                                 exit(EXIT_FAILURE);
 125                         }
 126                         st->listen_port = q;
 127                         break;
 128         }
 129     }
 130
 131     if (optind < argc) {
 132         printf("non-option ARGV-elements: ");
 133         while (optind < argc)
 134             printf("%s ", argv[optind++]);
 135         printf("\n");
 136     }
 137     return 0;
 138 }
 139
 140
 141 int main(int argc, char** argv) {
 142
 143         stlink_t *sl = NULL;
 144
 145         st_state_t state;
 146         memset(&state, 0, sizeof(state));
 147         // set defaults...
 148         state.stlink_version = 2;
 149         state.logging_level = DEFAULT_LOGGING_LEVEL;
 150         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 151         parse_options(argc, argv, &state);
 152         switch (state.stlink_version) {
 153         case 2:
 154                 sl = stlink_open_usb(state.logging_level);
 155                 if(sl == NULL) return 1;
 156                 break;
 157         case 1:
 158                 sl = stlink_v1_open(state.logging_level);
 159                 if(sl == NULL) return 1;
 160                 break;
 161     }
 162
 163         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 164
 165         sl->verbose=0;
 166
 167         current_memory_map = make_memory_map(sl);
 168
 169         while(serve(sl, state.listen_port) == 0);
 170
 171         /* Switch back to mass storage mode before closing. */
 172         stlink_run(sl);
 173         stlink_exit_debug_mode(sl);
 174         stlink_close(sl);
 175
 176         return 0;
 177 }
 178
 179 static const char* const memory_map_template_F4 =
 180   "<?xml version=\"1.0\"?>"
 181   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 182   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 183   "<memory-map>"
 184   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 185   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"        // sram
 186   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 187   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 188   "  </memory>"
 189   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 190   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 191   "  </memory>"
 192   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 193   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 194   "  </memory>"
 195   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 196   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 197   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 198   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 199   "</memory-map>";
 200
 201 static const char* const memory_map_template =
 202   "<?xml version=\"1.0\"?>"
 203   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 204   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 205   "<memory-map>"
 206   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 207   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 208   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 209   "    <property name=\"blocksize\">0x%x</property>"
 210   "  </memory>"
 211   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 212   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 213   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 214   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 215   "</memory-map>";
 216
 217 char* make_memory_map(stlink_t *sl) {
 218         /* This will be freed in serve() */
 219         char* map = malloc(4096);
 220         map[0] = '\0';
 221
 222         if(sl->chip_id==STM32_CHIPID_F4) {
 223         strcpy(map, memory_map_template_F4);
 224     } else {
 225         snprintf(map, 4096, memory_map_template,
 226                         sl->flash_size,
 227                         sl->sram_size,
 228                         sl->flash_size, sl->flash_pgsz,
 229                         sl->sys_base, sl->sys_size);
 230     }
 231         return map;
 232 }
 233
 234
 235 /*
 236  * DWT_COMP0     0xE0001020
 237  * DWT_MASK0     0xE0001024
 238  * DWT_FUNCTION0 0xE0001028
 239  * DWT_COMP1     0xE0001030
 240  * DWT_MASK1     0xE0001034
 241  * DWT_FUNCTION1 0xE0001038
 242  * DWT_COMP2     0xE0001040
 243  * DWT_MASK2     0xE0001044
 244  * DWT_FUNCTION2 0xE0001048
 245  * DWT_COMP3     0xE0001050
 246  * DWT_MASK3     0xE0001054
 247  * DWT_FUNCTION3 0xE0001058
 248  */
 249
 250 #define DATA_WATCH_NUM 4
 251
 252 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 253
 254 struct code_hw_watchpoint {
 255         stm32_addr_t addr;
 256         uint8_t mask;
 257         enum watchfun fun;
 258 };
 259
 260 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 261
 262 static void init_data_watchpoints(stlink_t *sl) {
 263         #ifdef DEBUG
 264         printf("init watchpoints\n");
 265         #endif
 266
 267         // set trcena in debug command to turn on dwt unit
 268         stlink_write_debug32(sl, 0xE000EDFC,
 269                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 270
 271         // make sure all watchpoints are cleared
 272         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 273                 data_watches[i].fun = WATCHDISABLED;
 274                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 275         }
 276 }
 277
 278 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 279 {
 280         int i = 0;
 281         uint32_t mask;
 282
 283         // computer mask
 284         // find a free watchpoint
 285         // configure
 286
 287         mask = -1;
 288         i = len;
 289         while(i) {
 290                 i >>= 1;
 291                 mask++;
 292         }
 293
 294         if((mask != -1) && (mask < 16)) {
 295                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 296                         // is this an empty slot ?
 297                         if(data_watches[i].fun == WATCHDISABLED) {
 298                                 #ifdef DEBUG
 299                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 300                                 #endif
 301
 302                                 data_watches[i].fun = wf;
 303                                 data_watches[i].addr = addr;
 304                                 data_watches[i].mask = mask;
 305
 306                                 // insert comparator address
 307                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 308
 309                                 // insert mask
 310                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 311
 312                                 // insert function
 313                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 314
 315                                 // just to make sure the matched bit is clear !
 316                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 317                                 return 0;
 318                         }
 319                 }
 320         }
 321
 322         #ifdef DEBUG
 323         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 324         #endif
 325         return -1;
 326 }
 327
 328 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 329 {
 330         int i;
 331
 332         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 333                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 334                         #ifdef DEBUG
 335                         printf("delete watchpoint %d addr %x\n", i, addr);
 336                         #endif
 337
 338                         data_watches[i].fun = WATCHDISABLED;
 339                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 340
 341                         return 0;
 342                 }
 343         }
 344
 345         #ifdef DEBUG
 346         printf("failure: delete watchpoint addr %x\n", addr);
 347         #endif
 348
 349         return -1;
 350 }
 351
 352 #define CODE_BREAK_NUM  6
 353 #define CODE_BREAK_LOW  0x01
 354 #define CODE_BREAK_HIGH 0x02
 355
 356 struct code_hw_breakpoint {
 357         stm32_addr_t addr;
 358         int          type;
 359 };
 360
 361 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 362
 363 static void init_code_breakpoints(stlink_t *sl) {
 364         memset(sl->q_buf, 0, 4);
 365         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 366         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 367         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 368
 369         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 370                 code_breaks[i].type = 0;
 371                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 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         if(brk->type == 0) {
 406                 #ifdef DEBUG
 407                 printf("clearing hw break %d\n", id);
 408                 #endif
 409
 410                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 411         } else {
 412                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 413
 414                 #ifdef DEBUG
 415                 printf("setting hw break %d at %08x (%d)\n",
 416                         id, brk->addr, brk->type);
 417                 printf("reg %08x \n",
 418                         mask);
 419                 #endif
 420
 421                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 422         }
 423
 424         return 0;
 425 }
 426
 427
 428 struct flash_block {
 429         stm32_addr_t addr;
 430         unsigned     length;
 431         uint8_t*     data;
 432
 433         struct flash_block* next;
 434 };
 435
 436 static struct flash_block* flash_root;
 437
 438 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 439
 440         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 441                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 442                 return -1;
 443         }
 444
 445         stlink_calculate_pagesize(sl, addr);
 446         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 447                 fprintf(stderr, "flash_add_block: unaligned block\n");
 448                 return -1;
 449         }
 450
 451         struct flash_block* new = malloc(sizeof(struct flash_block));
 452         new->next = flash_root;
 453
 454         new->addr   = addr;
 455         new->length = length;
 456         new->data   = calloc(length, 1);
 457
 458         flash_root = new;
 459
 460         return 0;
 461 }
 462
 463 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 464         int fit_blocks = 0, fit_length = 0;
 465
 466         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 467                 /* Block: ------X------Y--------
 468                  * Data:            a-----b
 469                  *                a--b
 470                  *            a-----------b
 471                  * Block intersects with data, if:
 472                  *  a < Y && b > x
 473                  */
 474
 475                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 476                 unsigned a = addr, b = addr + length;
 477                 if(a < Y && b > X) {
 478                         // from start of the block
 479                         unsigned start = (a > X ? a : X) - X;
 480                         unsigned end   = (b > Y ? Y : b) - X;
 481
 482                         memcpy(fb->data + start, data, end - start);
 483
 484                         fit_blocks++;
 485                         fit_length += end - start;
 486                 }
 487         }
 488
 489         if(fit_blocks == 0) {
 490                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 491                 return -1;
 492         }
 493
 494         if(fit_length != length) {
 495                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 496                         addr, length, fit_length);
 497                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int flash_go(stlink_t *sl) {
 504         int error = -1;
 505
 506         // Some kinds of clock settings do not allow writing to flash.
 507         stlink_reset(sl);
 508
 509         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 510                 #ifdef DEBUG
 511                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 512                 #endif
 513
 514                 unsigned length = fb->length;
 515                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 516
 517                         //Update FLASH_PAGE
 518                         stlink_calculate_pagesize(sl, page);
 519
 520                         #ifdef DEBUG
 521                         printf("flash_do: page %08x\n", page);
 522                         #endif
 523
 524                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 525                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 526                                 goto error;
 527                         }
 528         }
 529
 530         stlink_reset(sl);
 531
 532         error = 0;
 533
 534 error:
 535         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 536                 next = fb->next;
 537                 free(fb->data);
 538                 free(fb);
 539         }
 540
 541         flash_root = NULL;
 542
 543         return error;
 544 }
 545
 546 int serve(stlink_t *sl, int port) {
 547         int sock = socket(AF_INET, SOCK_STREAM, 0);
 548         if(sock < 0) {
 549                 perror("socket");
 550                 return 1;
 551         }
 552
 553         unsigned int val = 1;
 554         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 555
 556         struct sockaddr_in serv_addr = {0};
 557         serv_addr.sin_family = AF_INET;
 558         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 559         serv_addr.sin_port = htons(port);
 560
 561         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 562                 perror("bind");
 563                 return 1;
 564         }
 565
 566         if(listen(sock, 5) < 0) {
 567                 perror("listen");
 568                 return 1;
 569         }
 570
 571         stlink_force_debug(sl);
 572         stlink_reset(sl);
 573         init_code_breakpoints(sl);
 574         init_data_watchpoints(sl);
 575
 576         printf("Listening at *:%d...\n", port);
 577
 578         int client = accept(sock, NULL, NULL);
 579         signal (SIGINT, SIG_DFL);
 580         if(client < 0) {
 581                 perror("accept");
 582                 return 1;
 583         }
 584
 585         close(sock);
 586
 587         printf("GDB connected.\n");
 588
 589         /*
 590          * To allow resetting the chip from GDB it is required to
 591          * emulate attaching and detaching to target.
 592          */
 593         unsigned int attached = 1;
 594
 595         while(1) {
 596                 char* packet;
 597
 598                 int status = gdb_recv_packet(client, &packet);
 599                 if(status < 0) {
 600                         fprintf(stderr, "cannot recv: %d\n", status);
 601                         return 1;
 602                 }
 603
 604                 #ifdef DEBUG
 605                 printf("recv: %s\n", packet);
 606                 #endif
 607
 608                 char* reply = NULL;
 609                 reg regp;
 610
 611                 switch(packet[0]) {
 612                 case 'q': {
 613                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 614                                 reply = strdup("");
 615                                 break;
 616                         }
 617
 618                         char *separator = strstr(packet, ":"), *params = "";
 619                         if(separator == NULL) {
 620                                 separator = packet + strlen(packet);
 621                         } else {
 622                                 params = separator + 1;
 623                         }
 624
 625                         unsigned queryNameLength = (separator - &packet[1]);
 626                         char* queryName = calloc(queryNameLength + 1, 1);
 627                         strncpy(queryName, &packet[1], queryNameLength);
 628
 629                         #ifdef DEBUG
 630                         printf("query: %s;%s\n", queryName, params);
 631                         #endif
 632
 633                         if(!strcmp(queryName, "Supported")) {
 634                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 635                         } else if(!strcmp(queryName, "Xfer")) {
 636                                 char *type, *op, *s_addr, *s_length;
 637                                 char *tok = params;
 638                                 char *annex __attribute__((unused));
 639
 640                                 type     = strsep(&tok, ":");
 641                                 op       = strsep(&tok, ":");
 642                                 annex    = strsep(&tok, ":");
 643                                 s_addr   = strsep(&tok, ",");
 644                                 s_length = tok;
 645
 646                                 unsigned addr = strtoul(s_addr, NULL, 16),
 647                                        length = strtoul(s_length, NULL, 16);
 648
 649                                 #ifdef DEBUG
 650                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 651                                         type, op, annex, addr, length);
 652                                 #endif
 653
 654                                 const char* data = NULL;
 655
 656                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 657                                         data = current_memory_map;
 658
 659                                 if(data) {
 660                                         unsigned data_length = strlen(data);
 661                                         if(addr + length > data_length)
 662                                                 length = data_length - addr;
 663
 664                                         if(length == 0) {
 665                                                 reply = strdup("l");
 666                                         } else {
 667                                                 reply = calloc(length + 2, 1);
 668                                                 reply[0] = 'm';
 669                                                 strncpy(&reply[1], data, length);
 670                                         }
 671                                 }
 672                         }
 673
 674                         if(reply == NULL)
 675                                 reply = strdup("");
 676
 677                         free(queryName);
 678
 679                         break;
 680                 }
 681
 682                 case 'v': {
 683                         char *params = NULL;
 684                         char *cmdName = strtok_r(packet, ":;", &params);
 685
 686                         cmdName++; // vCommand -> Command
 687
 688                         if(!strcmp(cmdName, "FlashErase")) {
 689                                 char *s_addr, *s_length;
 690                                 char *tok = params;
 691
 692                                 s_addr   = strsep(&tok, ",");
 693                                 s_length = tok;
 694
 695                                 unsigned addr = strtoul(s_addr, NULL, 16),
 696                                        length = strtoul(s_length, NULL, 16);
 697
 698                                 #ifdef DEBUG
 699                                 printf("FlashErase: addr:%08x,len:%04x\n",
 700                                         addr, length);
 701                                 #endif
 702
 703                                 if(flash_add_block(addr, length, sl) < 0) {
 704                                         reply = strdup("E00");
 705                                 } else {
 706                                         reply = strdup("OK");
 707                                 }
 708                         } else if(!strcmp(cmdName, "FlashWrite")) {
 709                                 char *s_addr, *data;
 710                                 char *tok = params;
 711
 712                                 s_addr = strsep(&tok, ":");
 713                                 data   = tok;
 714
 715                                 unsigned addr = strtoul(s_addr, NULL, 16);
 716                                 unsigned data_length = status - (data - packet);
 717
 718                                 // Length of decoded data cannot be more than
 719                                 // encoded, as escapes are removed.
 720                                 // Additional byte is reserved for alignment fix.
 721                                 uint8_t *decoded = calloc(data_length + 1, 1);
 722                                 unsigned dec_index = 0;
 723                                 for(int i = 0; i < data_length; i++) {
 724                                         if(data[i] == 0x7d) {
 725                                                 i++;
 726                                                 decoded[dec_index++] = data[i] ^ 0x20;
 727                                         } else {
 728                                                 decoded[dec_index++] = data[i];
 729                                         }
 730                                 }
 731
 732                                 // Fix alignment
 733                                 if(dec_index % 2 != 0)
 734                                         dec_index++;
 735
 736                                 #ifdef DEBUG
 737                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 738                                 #endif
 739
 740                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 741                                         reply = strdup("E00");
 742                                 } else {
 743                                         reply = strdup("OK");
 744                                 }
 745                         } else if(!strcmp(cmdName, "FlashDone")) {
 746                                 if(flash_go(sl) < 0) {
 747                                         reply = strdup("E00");
 748                                 } else {
 749                                         reply = strdup("OK");
 750                                 }
 751                         } else if(!strcmp(cmdName, "Kill")) {
 752                                 attached = 0;
 753
 754                                 reply = strdup("OK");
 755                         }
 756
 757                         if(reply == NULL)
 758                                 reply = strdup("");
 759
 760                         break;
 761                 }
 762
 763                 case 'c':
 764                         stlink_run(sl);
 765
 766                         while(1) {
 767                                 int status = gdb_check_for_interrupt(client);
 768                                 if(status < 0) {
 769                                         fprintf(stderr, "cannot check for int: %d\n", status);
 770                                         return 1;
 771                                 }
 772
 773                                 if(status == 1) {
 774                                         stlink_force_debug(sl);
 775                                         break;
 776                                 }
 777
 778                                 stlink_status(sl);
 779                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 780                                         break;
 781                                 }
 782
 783                                 usleep(100000);
 784                         }
 785
 786                         reply = strdup("S05"); // TRAP
 787                         break;
 788
 789                 case 's':
 790                         stlink_step(sl);
 791
 792                         reply = strdup("S05"); // TRAP
 793                         break;
 794
 795                 case '?':
 796                         if(attached) {
 797                                 reply = strdup("S05"); // TRAP
 798                         } else {
 799                                 /* Stub shall reply OK if not attached. */
 800                                 reply = strdup("OK");
 801                         }
 802                         break;
 803
 804                 case 'g':
 805                         stlink_read_all_regs(sl, &regp);
 806
 807                         reply = calloc(8 * 16 + 1, 1);
 808                         for(int i = 0; i < 16; i++)
 809                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 810
 811                         break;
 812
 813                 case 'p': {
 814                         unsigned id = strtoul(&packet[1], NULL, 16);
 815                         unsigned myreg = 0xDEADDEAD;
 816
 817                         if(id < 16) {
 818                                 stlink_read_reg(sl, id, &regp);
 819                                 myreg = htonl(regp.r[id]);
 820                         } else if(id == 0x19) {
 821                                 stlink_read_reg(sl, 16, &regp);
 822                                 myreg = htonl(regp.xpsr);
 823                         } else {
 824                                 reply = strdup("E00");
 825                         }
 826
 827                         reply = calloc(8 + 1, 1);
 828                         sprintf(reply, "%08x", myreg);
 829
 830                         break;
 831                 }
 832
 833                 case 'P': {
 834                         char* s_reg = &packet[1];
 835                         char* s_value = strstr(&packet[1], "=") + 1;
 836
 837                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 838                         unsigned value = strtoul(s_value, NULL, 16);
 839
 840                         if(reg < 16) {
 841                                 stlink_write_reg(sl, ntohl(value), reg);
 842                         } else if(reg == 0x19) {
 843                                 stlink_write_reg(sl, ntohl(value), 16);
 844                         } else {
 845                                 reply = strdup("E00");
 846                         }
 847
 848                         if(!reply) {
 849                                 reply = strdup("OK");
 850                         }
 851
 852                         break;
 853                 }
 854
 855                 case 'G':
 856                         for(int i = 0; i < 16; i++) {
 857                                 char str[9] = {0};
 858                                 strncpy(str, &packet[1 + i * 8], 8);
 859                                 uint32_t reg = strtoul(str, NULL, 16);
 860                                 stlink_write_reg(sl, ntohl(reg), i);
 861                         }
 862
 863                         reply = strdup("OK");
 864                         break;
 865
 866                 case 'm': {
 867                         char* s_start = &packet[1];
 868                         char* s_count = strstr(&packet[1], ",") + 1;
 869
 870                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 871                         unsigned     count = strtoul(s_count, NULL, 16);
 872
 873                         unsigned adj_start = start % 4;
 874
 875                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 876                                                 count : count + 4 - (count % 4));
 877
 878                         reply = calloc(count * 2 + 1, 1);
 879                         for(int i = 0; i < count; i++) {
 880                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 881                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 882                         }
 883
 884                         break;
 885                 }
 886
 887                 case 'M': {
 888                         char* s_start = &packet[1];
 889                         char* s_count = strstr(&packet[1], ",") + 1;
 890                         char* hexdata = strstr(packet, ":") + 1;
 891
 892                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 893                         unsigned     count = strtoul(s_count, NULL, 16);
 894
 895                         for(int i = 0; i < count; i ++) {
 896                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 897                                 uint8_t byte = strtoul(hex, NULL, 16);
 898                                 sl->q_buf[i] = byte;
 899                         }
 900
 901                         if((count % 4) == 0 && (start % 4) == 0) {
 902                                 stlink_write_mem32(sl, start, count);
 903                         } else {
 904                                 stlink_write_mem8(sl, start, count);
 905                         }
 906
 907                         reply = strdup("OK");
 908
 909                         break;
 910                 }
 911
 912                 case 'Z': {
 913                         char *endptr;
 914                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 915                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 916
 917                         switch (packet[1]) {
 918                                 case '1':
 919                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 920                                         reply = strdup("E00");
 921                                 } else {
 922                                         reply = strdup("OK");
 923                                 }
 924                                 break;
 925
 926                                 case '2':   // insert write watchpoint
 927                                 case '3':   // insert read  watchpoint
 928                                 case '4':   // insert access watchpoint
 929                                 {
 930                                         enum watchfun wf;
 931                                         if(packet[1] == '2') {
 932                                                 wf = WATCHWRITE;
 933                                         } else if(packet[1] == '3') {
 934                                                 wf = WATCHREAD;
 935                                         } else {
 936                                                 wf = WATCHACCESS;
 937                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 938                                                         reply = strdup("E00");
 939                                                 } else {
 940                                                         reply = strdup("OK");
 941                                                         break;
 942                                                 }
 943                                         }
 944                                 }
 945
 946                                 default:
 947                                 reply = strdup("");
 948                         }
 949                         break;
 950                 }
 951                 case 'z': {
 952                         char *endptr;
 953                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 954                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 955
 956                         switch (packet[1]) {
 957                                 case '1': // remove breakpoint
 958                                 update_code_breakpoint(sl, addr, 0);
 959                                 reply = strdup("OK");
 960                                 break;
 961
 962                                 case '2' : // remove write watchpoint
 963                                 case '3' : // remove read watchpoint
 964                                 case '4' : // remove access watchpoint
 965                                 if(delete_data_watchpoint(sl, addr) < 0) {
 966                                         reply = strdup("E00");
 967                                 } else {
 968                                         reply = strdup("OK");
 969                                         break;
 970                                 }
 971
 972                                 default:
 973                                 reply = strdup("");
 974                         }
 975                         break;
 976                 }
 977
 978                 case '!': {
 979                         /*
 980                          * Enter extended mode which allows restarting.
 981                          * We do support that always.
 982                          */
 983
 984                         reply = strdup("OK");
 985
 986                         break;
 987                 }
 988
 989                 case 'R': {
 990                         /* Reset the core. */
 991
 992                         stlink_reset(sl);
 993                         init_code_breakpoints(sl);
 994                         init_data_watchpoints(sl);
 995
 996                         attached = 1;
 997
 998                         reply = strdup("OK");
 999
1000                         break;
1001                 }
1002
1003                 default:
1004                         reply = strdup("");
1005                 }
1006
1007                 if(reply) {
1008                         #ifdef DEBUG
1009                         printf("send: %s\n", reply);
1010                         #endif
1011
1012                         int result = gdb_send_packet(client, reply);
1013                         if(result != 0) {
1014                                 fprintf(stderr, "cannot send: %d\n", result);
1015                                 return 1;
1016                         }
1017
1018                         free(reply);
1019                 }
1020
1021                 free(packet);
1022         }
1023
1024         return 0;
1025 }