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=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 186   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 187   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 188   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 189   "  </memory>"
 190   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 191   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 192   "  </memory>"
 193   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 194   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 195   "  </memory>"
 196   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 197   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 198   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 199   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 200   "</memory-map>";
 201
 202 static const char* const memory_map_template =
 203   "<?xml version=\"1.0\"?>"
 204   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 205   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 206   "<memory-map>"
 207   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 208   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 209   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 210   "    <property name=\"blocksize\">0x%x</property>"
 211   "  </memory>"
 212   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 213   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 214   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 215   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 216   "</memory-map>";
 217
 218 char* make_memory_map(stlink_t *sl) {
 219         /* This will be freed in serve() */
 220         char* map = malloc(4096);
 221         map[0] = '\0';
 222
 223         if(sl->chip_id==STM32_CHIPID_F4) {
 224         strcpy(map, memory_map_template_F4);
 225     } else {
 226         snprintf(map, 4096, memory_map_template,
 227                         sl->flash_size,
 228                         sl->sram_size,
 229                         sl->flash_size, sl->flash_pgsz,
 230                         sl->sys_base, sl->sys_size);
 231     }
 232         return map;
 233 }
 234
 235
 236 /*
 237  * DWT_COMP0     0xE0001020
 238  * DWT_MASK0     0xE0001024
 239  * DWT_FUNCTION0 0xE0001028
 240  * DWT_COMP1     0xE0001030
 241  * DWT_MASK1     0xE0001034
 242  * DWT_FUNCTION1 0xE0001038
 243  * DWT_COMP2     0xE0001040
 244  * DWT_MASK2     0xE0001044
 245  * DWT_FUNCTION2 0xE0001048
 246  * DWT_COMP3     0xE0001050
 247  * DWT_MASK3     0xE0001054
 248  * DWT_FUNCTION3 0xE0001058
 249  */
 250
 251 #define DATA_WATCH_NUM 4
 252
 253 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 254
 255 struct code_hw_watchpoint {
 256         stm32_addr_t addr;
 257         uint8_t mask;
 258         enum watchfun fun;
 259 };
 260
 261 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 262
 263 static void init_data_watchpoints(stlink_t *sl) {
 264         #ifdef DEBUG
 265         printf("init watchpoints\n");
 266         #endif
 267
 268         // set trcena in debug command to turn on dwt unit
 269         stlink_write_debug32(sl, 0xE000EDFC,
 270                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 271
 272         // make sure all watchpoints are cleared
 273         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 274                 data_watches[i].fun = WATCHDISABLED;
 275                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 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                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 309
 310                                 // insert mask
 311                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 312
 313                                 // insert function
 314                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 315
 316                                 // just to make sure the matched bit is clear !
 317                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 318                                 return 0;
 319                         }
 320                 }
 321         }
 322
 323         #ifdef DEBUG
 324         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 325         #endif
 326         return -1;
 327 }
 328
 329 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 330 {
 331         int i;
 332
 333         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 334                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 335                         #ifdef DEBUG
 336                         printf("delete watchpoint %d addr %x\n", i, addr);
 337                         #endif
 338
 339                         data_watches[i].fun = WATCHDISABLED;
 340                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 341
 342                         return 0;
 343                 }
 344         }
 345
 346         #ifdef DEBUG
 347         printf("failure: delete watchpoint addr %x\n", addr);
 348         #endif
 349
 350         return -1;
 351 }
 352
 353 #define CODE_BREAK_NUM  6
 354 #define CODE_BREAK_LOW  0x01
 355 #define CODE_BREAK_HIGH 0x02
 356
 357 struct code_hw_breakpoint {
 358         stm32_addr_t addr;
 359         int          type;
 360 };
 361
 362 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 363
 364 static void init_code_breakpoints(stlink_t *sl) {
 365         memset(sl->q_buf, 0, 4);
 366         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 367         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 368         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 369
 370         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 371                 code_breaks[i].type = 0;
 372                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 373         }
 374 }
 375
 376 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 377         stm32_addr_t fpb_addr = addr & ~0x3;
 378         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 379
 380         if(addr & 1) {
 381                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 382                 return -1;
 383         }
 384
 385         int id = -1;
 386         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 387                 if(fpb_addr == code_breaks[i].addr ||
 388                         (set && code_breaks[i].type == 0)) {
 389                         id = i;
 390                         break;
 391                 }
 392         }
 393
 394         if(id == -1) {
 395                 if(set) return -1; // Free slot not found
 396                 else    return 0;  // Breakpoint is already removed
 397         }
 398
 399         struct code_hw_breakpoint* brk = &code_breaks[id];
 400
 401         brk->addr = fpb_addr;
 402
 403         if(set) brk->type |= type;
 404         else    brk->type &= ~type;
 405
 406         if(brk->type == 0) {
 407                 #ifdef DEBUG
 408                 printf("clearing hw break %d\n", id);
 409                 #endif
 410
 411                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 412         } else {
 413                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 414
 415                 #ifdef DEBUG
 416                 printf("setting hw break %d at %08x (%d)\n",
 417                         id, brk->addr, brk->type);
 418                 printf("reg %08x \n",
 419                         mask);
 420                 #endif
 421
 422                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 423         }
 424
 425         return 0;
 426 }
 427
 428
 429 struct flash_block {
 430         stm32_addr_t addr;
 431         unsigned     length;
 432         uint8_t*     data;
 433
 434         struct flash_block* next;
 435 };
 436
 437 static struct flash_block* flash_root;
 438
 439 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 440
 441         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 442                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 443                 return -1;
 444         }
 445
 446         stlink_calculate_pagesize(sl, addr);
 447         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 448                 fprintf(stderr, "flash_add_block: unaligned block\n");
 449                 return -1;
 450         }
 451
 452         struct flash_block* new = malloc(sizeof(struct flash_block));
 453         new->next = flash_root;
 454
 455         new->addr   = addr;
 456         new->length = length;
 457         new->data   = calloc(length, 1);
 458
 459         flash_root = new;
 460
 461         return 0;
 462 }
 463
 464 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 465         int fit_blocks = 0, fit_length = 0;
 466
 467         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 468                 /* Block: ------X------Y--------
 469                  * Data:            a-----b
 470                  *                a--b
 471                  *            a-----------b
 472                  * Block intersects with data, if:
 473                  *  a < Y && b > x
 474                  */
 475
 476                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 477                 unsigned a = addr, b = addr + length;
 478                 if(a < Y && b > X) {
 479                         // from start of the block
 480                         unsigned start = (a > X ? a : X) - X;
 481                         unsigned end   = (b > Y ? Y : b) - X;
 482
 483                         memcpy(fb->data + start, data, end - start);
 484
 485                         fit_blocks++;
 486                         fit_length += end - start;
 487                 }
 488         }
 489
 490         if(fit_blocks == 0) {
 491                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 492                 return -1;
 493         }
 494
 495         if(fit_length != length) {
 496                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 497                         addr, length, fit_length);
 498                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 499         }
 500
 501         return 0;
 502 }
 503
 504 static int flash_go(stlink_t *sl) {
 505         int error = -1;
 506
 507         // Some kinds of clock settings do not allow writing to flash.
 508         stlink_reset(sl);
 509
 510         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 511                 #ifdef DEBUG
 512                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 513                 #endif
 514
 515                 unsigned length = fb->length;
 516                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 517
 518                         //Update FLASH_PAGE
 519                         stlink_calculate_pagesize(sl, page);
 520
 521                         #ifdef DEBUG
 522                         printf("flash_do: page %08x\n", page);
 523                         #endif
 524
 525                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 526                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 527                                 goto error;
 528                         }
 529         }
 530
 531         stlink_reset(sl);
 532
 533         error = 0;
 534
 535 error:
 536         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 537                 next = fb->next;
 538                 free(fb->data);
 539                 free(fb);
 540         }
 541
 542         flash_root = NULL;
 543
 544         return error;
 545 }
 546
 547 int serve(stlink_t *sl, int port) {
 548         int sock = socket(AF_INET, SOCK_STREAM, 0);
 549         if(sock < 0) {
 550                 perror("socket");
 551                 return 1;
 552         }
 553
 554         unsigned int val = 1;
 555         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 556
 557         struct sockaddr_in serv_addr = {0};
 558         serv_addr.sin_family = AF_INET;
 559         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 560         serv_addr.sin_port = htons(port);
 561
 562         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 563                 perror("bind");
 564                 return 1;
 565         }
 566
 567         if(listen(sock, 5) < 0) {
 568                 perror("listen");
 569                 return 1;
 570         }
 571
 572         stlink_force_debug(sl);
 573         stlink_reset(sl);
 574         init_code_breakpoints(sl);
 575         init_data_watchpoints(sl);
 576
 577         printf("Listening at *:%d...\n", port);
 578
 579         int client = accept(sock, NULL, NULL);
 580         signal (SIGINT, SIG_DFL);
 581         if(client < 0) {
 582                 perror("accept");
 583                 return 1;
 584         }
 585
 586         close(sock);
 587
 588         printf("GDB connected.\n");
 589
 590         /*
 591          * To allow resetting the chip from GDB it is required to
 592          * emulate attaching and detaching to target.
 593          */
 594         unsigned int attached = 1;
 595
 596         while(1) {
 597                 char* packet;
 598
 599                 int status = gdb_recv_packet(client, &packet);
 600                 if(status < 0) {
 601                         fprintf(stderr, "cannot recv: %d\n", status);
 602                         return 1;
 603                 }
 604
 605                 #ifdef DEBUG
 606                 printf("recv: %s\n", packet);
 607                 #endif
 608
 609                 char* reply = NULL;
 610                 reg regp;
 611
 612                 switch(packet[0]) {
 613                 case 'q': {
 614                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 615                                 reply = strdup("");
 616                                 break;
 617                         }
 618
 619                         char *separator = strstr(packet, ":"), *params = "";
 620                         if(separator == NULL) {
 621                                 separator = packet + strlen(packet);
 622                         } else {
 623                                 params = separator + 1;
 624                         }
 625
 626                         unsigned queryNameLength = (separator - &packet[1]);
 627                         char* queryName = calloc(queryNameLength + 1, 1);
 628                         strncpy(queryName, &packet[1], queryNameLength);
 629
 630                         #ifdef DEBUG
 631                         printf("query: %s;%s\n", queryName, params);
 632                         #endif
 633
 634                         if(!strcmp(queryName, "Supported")) {
 635                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 636                         } else if(!strcmp(queryName, "Xfer")) {
 637                                 char *type, *op, *s_addr, *s_length;
 638                                 char *tok = params;
 639                                 char *annex __attribute__((unused));
 640
 641                                 type     = strsep(&tok, ":");
 642                                 op       = strsep(&tok, ":");
 643                                 annex    = strsep(&tok, ":");
 644                                 s_addr   = strsep(&tok, ",");
 645                                 s_length = tok;
 646
 647                                 unsigned addr = strtoul(s_addr, NULL, 16),
 648                                        length = strtoul(s_length, NULL, 16);
 649
 650                                 #ifdef DEBUG
 651                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 652                                         type, op, annex, addr, length);
 653                                 #endif
 654
 655                                 const char* data = NULL;
 656
 657                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 658                                         data = current_memory_map;
 659
 660                                 if(data) {
 661                                         unsigned data_length = strlen(data);
 662                                         if(addr + length > data_length)
 663                                                 length = data_length - addr;
 664
 665                                         if(length == 0) {
 666                                                 reply = strdup("l");
 667                                         } else {
 668                                                 reply = calloc(length + 2, 1);
 669                                                 reply[0] = 'm';
 670                                                 strncpy(&reply[1], data, length);
 671                                         }
 672                                 }
 673                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 674                                 // Rcmd uses the wrong separator
 675                                 char *separator = strstr(packet, ","), *params = "";
 676                                 if(separator == NULL) {
 677                                         separator = packet + strlen(packet);
 678                                 } else {
 679                                         params = separator + 1;
 680                                 }
 681
 682
 683                                 if (!strncmp(params,"7265",4)) {// resume
 684 #ifdef DEBUG
 685                                         printf("Rcmd: resume\n");
 686 #endif
 687                                         stlink_run(sl);
 688
 689                                         reply = strdup("OK");
 690                                 } else if (!strncmp(params,"6861",4)) { //half
 691                                         reply = strdup("OK");
 692
 693                                         stlink_force_debug(sl);
 694
 695 #ifdef DEBUG
 696                                         printf("Rcmd: halt\n");
 697 #endif
 698                                 } else if (!strncmp(params,"7265",4)) { //reset
 699                                         reply = strdup("OK");
 700
 701                                         stlink_force_debug(sl);
 702                                         stlink_reset(sl);
 703                                         init_code_breakpoints(sl);
 704                                         init_data_watchpoints(sl);
 705
 706 #ifdef DEBUG
 707                                         printf("Rcmd: reset\n");
 708 #endif
 709                                 } else {
 710 #ifdef DEBUG
 711                                         printf("Rcmd: %s\n", params);
 712 #endif
 713
 714                                 }
 715
 716                         }
 717
 718                         if(reply == NULL)
 719                                 reply = strdup("");
 720
 721                         free(queryName);
 722
 723                         break;
 724                 }
 725
 726                 case 'v': {
 727                         char *params = NULL;
 728                         char *cmdName = strtok_r(packet, ":;", &params);
 729
 730                         cmdName++; // vCommand -> Command
 731
 732                         if(!strcmp(cmdName, "FlashErase")) {
 733                                 char *s_addr, *s_length;
 734                                 char *tok = params;
 735
 736                                 s_addr   = strsep(&tok, ",");
 737                                 s_length = tok;
 738
 739                                 unsigned addr = strtoul(s_addr, NULL, 16),
 740                                        length = strtoul(s_length, NULL, 16);
 741
 742                                 #ifdef DEBUG
 743                                 printf("FlashErase: addr:%08x,len:%04x\n",
 744                                         addr, length);
 745                                 #endif
 746
 747                                 if(flash_add_block(addr, length, sl) < 0) {
 748                                         reply = strdup("E00");
 749                                 } else {
 750                                         reply = strdup("OK");
 751                                 }
 752                         } else if(!strcmp(cmdName, "FlashWrite")) {
 753                                 char *s_addr, *data;
 754                                 char *tok = params;
 755
 756                                 s_addr = strsep(&tok, ":");
 757                                 data   = tok;
 758
 759                                 unsigned addr = strtoul(s_addr, NULL, 16);
 760                                 unsigned data_length = status - (data - packet);
 761
 762                                 // Length of decoded data cannot be more than
 763                                 // encoded, as escapes are removed.
 764                                 // Additional byte is reserved for alignment fix.
 765                                 uint8_t *decoded = calloc(data_length + 1, 1);
 766                                 unsigned dec_index = 0;
 767                                 for(int i = 0; i < data_length; i++) {
 768                                         if(data[i] == 0x7d) {
 769                                                 i++;
 770                                                 decoded[dec_index++] = data[i] ^ 0x20;
 771                                         } else {
 772                                                 decoded[dec_index++] = data[i];
 773                                         }
 774                                 }
 775
 776                                 // Fix alignment
 777                                 if(dec_index % 2 != 0)
 778                                         dec_index++;
 779
 780                                 #ifdef DEBUG
 781                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 782                                 #endif
 783
 784                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 785                                         reply = strdup("E00");
 786                                 } else {
 787                                         reply = strdup("OK");
 788                                 }
 789                         } else if(!strcmp(cmdName, "FlashDone")) {
 790                                 if(flash_go(sl) < 0) {
 791                                         reply = strdup("E00");
 792                                 } else {
 793                                         reply = strdup("OK");
 794                                 }
 795                         } else if(!strcmp(cmdName, "Kill")) {
 796                                 attached = 0;
 797
 798                                 reply = strdup("OK");
 799                         }
 800
 801                         if(reply == NULL)
 802                                 reply = strdup("");
 803
 804                         break;
 805                 }
 806
 807                 case 'c':
 808                         stlink_run(sl);
 809
 810                         while(1) {
 811                                 int status = gdb_check_for_interrupt(client);
 812                                 if(status < 0) {
 813                                         fprintf(stderr, "cannot check for int: %d\n", status);
 814                                         return 1;
 815                                 }
 816
 817                                 if(status == 1) {
 818                                         stlink_force_debug(sl);
 819                                         break;
 820                                 }
 821
 822                                 stlink_status(sl);
 823                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 824                                         break;
 825                                 }
 826
 827                                 usleep(100000);
 828                         }
 829
 830                         reply = strdup("S05"); // TRAP
 831                         break;
 832
 833                 case 's':
 834                         stlink_step(sl);
 835
 836                         reply = strdup("S05"); // TRAP
 837                         break;
 838
 839                 case '?':
 840                         if(attached) {
 841                                 reply = strdup("S05"); // TRAP
 842                         } else {
 843                                 /* Stub shall reply OK if not attached. */
 844                                 reply = strdup("OK");
 845                         }
 846                         break;
 847
 848                 case 'g':
 849                         stlink_read_all_regs(sl, &regp);
 850
 851                         reply = calloc(8 * 16 + 1, 1);
 852                         for(int i = 0; i < 16; i++)
 853                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 854
 855                         break;
 856
 857                 case 'p': {
 858                         unsigned id = strtoul(&packet[1], NULL, 16);
 859                         unsigned myreg = 0xDEADDEAD;
 860
 861                         if(id < 16) {
 862                                 stlink_read_reg(sl, id, &regp);
 863                                 myreg = htonl(regp.r[id]);
 864                         } else if(id == 0x19) {
 865                                 stlink_read_reg(sl, 16, &regp);
 866                                 myreg = htonl(regp.xpsr);
 867                         } else {
 868                                 reply = strdup("E00");
 869                         }
 870
 871                         reply = calloc(8 + 1, 1);
 872                         sprintf(reply, "%08x", myreg);
 873
 874                         break;
 875                 }
 876
 877                 case 'P': {
 878                         char* s_reg = &packet[1];
 879                         char* s_value = strstr(&packet[1], "=") + 1;
 880
 881                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 882                         unsigned value = strtoul(s_value, NULL, 16);
 883
 884                         if(reg < 16) {
 885                                 stlink_write_reg(sl, ntohl(value), reg);
 886                         } else if(reg == 0x19) {
 887                                 stlink_write_reg(sl, ntohl(value), 16);
 888                         } else {
 889                                 reply = strdup("E00");
 890                         }
 891
 892                         if(!reply) {
 893                                 reply = strdup("OK");
 894                         }
 895
 896                         break;
 897                 }
 898
 899                 case 'G':
 900                         for(int i = 0; i < 16; i++) {
 901                                 char str[9] = {0};
 902                                 strncpy(str, &packet[1 + i * 8], 8);
 903                                 uint32_t reg = strtoul(str, NULL, 16);
 904                                 stlink_write_reg(sl, ntohl(reg), i);
 905                         }
 906
 907                         reply = strdup("OK");
 908                         break;
 909
 910                 case 'm': {
 911                         char* s_start = &packet[1];
 912                         char* s_count = strstr(&packet[1], ",") + 1;
 913
 914                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 915                         unsigned     count = strtoul(s_count, NULL, 16);
 916
 917                         unsigned adj_start = start % 4;
 918
 919                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 920                                                 count : count + 4 - (count % 4));
 921
 922                         reply = calloc(count * 2 + 1, 1);
 923                         for(int i = 0; i < count; i++) {
 924                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 925                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 926                         }
 927
 928                         break;
 929                 }
 930
 931                 case 'M': {
 932                         char* s_start = &packet[1];
 933                         char* s_count = strstr(&packet[1], ",") + 1;
 934                         char* hexdata = strstr(packet, ":") + 1;
 935
 936                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 937                         unsigned     count = strtoul(s_count, NULL, 16);
 938
 939                         for(int i = 0; i < count; i ++) {
 940                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 941                                 uint8_t byte = strtoul(hex, NULL, 16);
 942                                 sl->q_buf[i] = byte;
 943                         }
 944
 945                         if((count % 4) == 0 && (start % 4) == 0) {
 946                                 stlink_write_mem32(sl, start, count);
 947                         } else {
 948                                 stlink_write_mem8(sl, start, count);
 949                         }
 950
 951                         reply = strdup("OK");
 952
 953                         break;
 954                 }
 955
 956                 case 'Z': {
 957                         char *endptr;
 958                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 959                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 960
 961                         switch (packet[1]) {
 962                                 case '1':
 963                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 964                                         reply = strdup("E00");
 965                                 } else {
 966                                         reply = strdup("OK");
 967                                 }
 968                                 break;
 969
 970                                 case '2':   // insert write watchpoint
 971                                 case '3':   // insert read  watchpoint
 972                                 case '4':   // insert access watchpoint
 973                                 {
 974                                         enum watchfun wf;
 975                                         if(packet[1] == '2') {
 976                                                 wf = WATCHWRITE;
 977                                         } else if(packet[1] == '3') {
 978                                                 wf = WATCHREAD;
 979                                         } else {
 980                                                 wf = WATCHACCESS;
 981                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 982                                                         reply = strdup("E00");
 983                                                 } else {
 984                                                         reply = strdup("OK");
 985                                                         break;
 986                                                 }
 987                                         }
 988                                 }
 989
 990                                 default:
 991                                 reply = strdup("");
 992                         }
 993                         break;
 994                 }
 995                 case 'z': {
 996                         char *endptr;
 997                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 998                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 999
1000                         switch (packet[1]) {
1001                                 case '1': // remove breakpoint
1002                                 update_code_breakpoint(sl, addr, 0);
1003                                 reply = strdup("OK");
1004                                 break;
1005
1006                                 case '2' : // remove write watchpoint
1007                                 case '3' : // remove read watchpoint
1008                                 case '4' : // remove access watchpoint
1009                                 if(delete_data_watchpoint(sl, addr) < 0) {
1010                                         reply = strdup("E00");
1011                                 } else {
1012                                         reply = strdup("OK");
1013                                         break;
1014                                 }
1015
1016                                 default:
1017                                 reply = strdup("");
1018                         }
1019                         break;
1020                 }
1021
1022                 case '!': {
1023                         /*
1024                          * Enter extended mode which allows restarting.
1025                          * We do support that always.
1026                          */
1027
1028                         reply = strdup("OK");
1029
1030                         break;
1031                 }
1032
1033                 case 'R': {
1034                         /* Reset the core. */
1035
1036                         stlink_reset(sl);
1037                         init_code_breakpoints(sl);
1038                         init_data_watchpoints(sl);
1039
1040                         attached = 1;
1041
1042                         reply = strdup("OK");
1043
1044                         break;
1045                 }
1046
1047                 default:
1048                         reply = strdup("");
1049                 }
1050
1051                 if(reply) {
1052                         #ifdef DEBUG
1053                         printf("send: %s\n", reply);
1054                         #endif
1055
1056                         int result = gdb_send_packet(client, reply);
1057                         if(result != 0) {
1058                                 fprintf(stderr, "cannot send: %d\n", result);
1059                                 return 1;
1060                         }
1061
1062                         free(reply);
1063                 }
1064
1065                 free(packet);
1066         }
1067
1068         return 0;
1069 }