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 #ifdef __MINGW32__
  16 #include "mingw.h"
  17 #else
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <signal.h>
  22 #endif
  23
  24 #include <stlink-common.h>
  25
  26 #include "gdb-remote.h"
  27
  28 #define DEFAULT_LOGGING_LEVEL 50
  29 #define DEFAULT_GDB_LISTEN_PORT 4242
  30
  31 #define STRINGIFY_inner(name) #name
  32 #define STRINGIFY(name) STRINGIFY_inner(name)
  33
  34 #define FLASH_BASE 0x08000000
  35
  36 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  37 #define FLASH_PAGE (sl->flash_pgsz)
  38
  39 static const char hex[] = "0123456789abcdef";
  40
  41 static const char* current_memory_map = NULL;
  42
  43 typedef struct _st_state_t {
  44     // things from command line, bleh
  45     int stlink_version;
  46     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  47     char devicename[100];
  48     int logging_level;
  49         int listen_port;
  50 } st_state_t;
  51
  52
  53 int serve(stlink_t *sl, int port);
  54 char* make_memory_map(stlink_t *sl);
  55
  56
  57 int parse_options(int argc, char** argv, st_state_t *st) {
  58     static struct option long_options[] = {
  59         {"help", no_argument, NULL, 'h'},
  60         {"verbose", optional_argument, NULL, 'v'},
  61         {"device", required_argument, NULL, 'd'},
  62         {"stlink_version", required_argument, NULL, 's'},
  63         {"stlinkv1", no_argument, NULL, '1'},
  64                 {"listen_port", required_argument, NULL, 'p'},
  65         {0, 0, 0, 0},
  66     };
  67         const char * help_str = "%s - usage:\n\n"
  68         "  -h, --help\t\tPrint this help\n"
  69         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  70         "  -v, --verbose\tspecify generally verbose logging\n"
  71         "  -d <device>, --device=/dev/stlink2_1\n"
  72         "\t\t\tWhere is your stlink device connected?\n"
  73         "  -s X, --stlink_version=X\n"
  74         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  75         "  -1, --stlinkv1\tForce stlink version 1\n"
  76         "  -p 4242, --listen_port=1234\n"
  77         "\t\t\tSet the gdb server listen port. "
  78         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  79         ;
  80
  81
  82     int option_index = 0;
  83     int c;
  84     int q;
  85     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  86         switch (c) {
  87         case 0:
  88             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  89             printf("option %s", long_options[option_index].name);
  90             if (optarg) {
  91                 printf(" with arg %s", optarg);
  92             }
  93             printf("\n");
  94             break;
  95         case 'h':
  96             printf(help_str, argv[0]);
  97             exit(EXIT_SUCCESS);
  98             break;
  99         case 'v':
 100             if (optarg) {
 101                 st->logging_level = atoi(optarg);
 102             } else {
 103                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 104             }
 105             break;
 106         case 'd':
 107             if (strlen(optarg) > sizeof (st->devicename)) {
 108                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 109             } else {
 110                 strcpy(st->devicename, optarg);
 111             }
 112             break;
 113                 case '1':
 114                         st->stlink_version = 1;
 115                         break;
 116                 case 's':
 117                         sscanf(optarg, "%i", &q);
 118                         if (q < 0 || q > 2) {
 119                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 120                                 exit(EXIT_FAILURE);
 121                         }
 122                         st->stlink_version = q;
 123                         break;
 124                 case 'p':
 125                         sscanf(optarg, "%i", &q);
 126                         if (q < 0) {
 127                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 128                                 exit(EXIT_FAILURE);
 129                         }
 130                         st->listen_port = q;
 131                         break;
 132         }
 133     }
 134
 135     if (optind < argc) {
 136         printf("non-option ARGV-elements: ");
 137         while (optind < argc)
 138             printf("%s ", argv[optind++]);
 139         printf("\n");
 140     }
 141     return 0;
 142 }
 143
 144
 145 int main(int argc, char** argv) {
 146
 147         stlink_t *sl = NULL;
 148
 149         st_state_t state;
 150         memset(&state, 0, sizeof(state));
 151         // set defaults...
 152         state.stlink_version = 2;
 153         state.logging_level = DEFAULT_LOGGING_LEVEL;
 154         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 155         parse_options(argc, argv, &state);
 156         switch (state.stlink_version) {
 157         case 2:
 158                 sl = stlink_open_usb(state.logging_level);
 159                 if(sl == NULL) return 1;
 160                 break;
 161         case 1:
 162                 sl = stlink_v1_open(state.logging_level);
 163                 if(sl == NULL) return 1;
 164                 break;
 165     }
 166
 167         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 168
 169         sl->verbose=0;
 170
 171         current_memory_map = make_memory_map(sl);
 172
 173 #ifdef __MINGW32__
 174         WSADATA wsadata;
 175         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 176                 goto winsock_error;
 177         }
 178 #endif
 179
 180         while(serve(sl, state.listen_port) == 0);
 181
 182 #ifdef __MINGW32__
 183 winsock_error:
 184         WSACleanup();
 185 #endif
 186
 187         /* Switch back to mass storage mode before closing. */
 188         stlink_run(sl);
 189         stlink_exit_debug_mode(sl);
 190         stlink_close(sl);
 191
 192         return 0;
 193 }
 194
 195 static const char* const memory_map_template_F4 =
 196   "<?xml version=\"1.0\"?>"
 197   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 198   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 199   "<memory-map>"
 200   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 201   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"        // sram
 202   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 203   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 204   "  </memory>"
 205   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 206   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 207   "  </memory>"
 208   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 209   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 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=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 214   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 215   "</memory-map>";
 216
 217 static const char* const memory_map_template =
 218   "<?xml version=\"1.0\"?>"
 219   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 220   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 221   "<memory-map>"
 222   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 223   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 224   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 225   "    <property name=\"blocksize\">0x%zx</property>"
 226   "  </memory>"
 227   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 228   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 229   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 230   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8x\"/>"        // option byte area
 231   "</memory-map>";
 232
 233 char* make_memory_map(stlink_t *sl) {
 234         /* This will be freed in serve() */
 235         char* map = malloc(4096);
 236         map[0] = '\0';
 237
 238         if(sl->chip_id==STM32_CHIPID_F4) {
 239         strcpy(map, memory_map_template_F4);
 240     } else {
 241         snprintf(map, 4096, memory_map_template,
 242                         sl->flash_size,
 243                         sl->sram_size,
 244                         sl->flash_size, sl->flash_pgsz,
 245                         sl->sys_base, sl->sys_size);
 246     }
 247         return map;
 248 }
 249
 250
 251 /*
 252  * DWT_COMP0     0xE0001020
 253  * DWT_MASK0     0xE0001024
 254  * DWT_FUNCTION0 0xE0001028
 255  * DWT_COMP1     0xE0001030
 256  * DWT_MASK1     0xE0001034
 257  * DWT_FUNCTION1 0xE0001038
 258  * DWT_COMP2     0xE0001040
 259  * DWT_MASK2     0xE0001044
 260  * DWT_FUNCTION2 0xE0001048
 261  * DWT_COMP3     0xE0001050
 262  * DWT_MASK3     0xE0001054
 263  * DWT_FUNCTION3 0xE0001058
 264  */
 265
 266 #define DATA_WATCH_NUM 4
 267
 268 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 269
 270 struct code_hw_watchpoint {
 271         stm32_addr_t addr;
 272         uint8_t mask;
 273         enum watchfun fun;
 274 };
 275
 276 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 277
 278 static void init_data_watchpoints(stlink_t *sl) {
 279         #ifdef DEBUG
 280         printf("init watchpoints\n");
 281         #endif
 282
 283         // set trcena in debug command to turn on dwt unit
 284         stlink_write_debug32(sl, 0xE000EDFC,
 285                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 286
 287         // make sure all watchpoints are cleared
 288         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 289                 data_watches[i].fun = WATCHDISABLED;
 290                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 291         }
 292 }
 293
 294 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 295 {
 296         int i = 0;
 297         uint32_t mask;
 298
 299         // computer mask
 300         // find a free watchpoint
 301         // configure
 302
 303         mask = -1;
 304         i = len;
 305         while(i) {
 306                 i >>= 1;
 307                 mask++;
 308         }
 309
 310         if((mask != (uint32_t)-1) && (mask < 16)) {
 311                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 312                         // is this an empty slot ?
 313                         if(data_watches[i].fun == WATCHDISABLED) {
 314                                 #ifdef DEBUG
 315                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 316                                 #endif
 317
 318                                 data_watches[i].fun = wf;
 319                                 data_watches[i].addr = addr;
 320                                 data_watches[i].mask = mask;
 321
 322                                 // insert comparator address
 323                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 324
 325                                 // insert mask
 326                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 327
 328                                 // insert function
 329                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 330
 331                                 // just to make sure the matched bit is clear !
 332                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 333                                 return 0;
 334                         }
 335                 }
 336         }
 337
 338         #ifdef DEBUG
 339         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 340         #endif
 341         return -1;
 342 }
 343
 344 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 345 {
 346         int i;
 347
 348         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 349                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 350                         #ifdef DEBUG
 351                         printf("delete watchpoint %d addr %x\n", i, addr);
 352                         #endif
 353
 354                         data_watches[i].fun = WATCHDISABLED;
 355                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 356
 357                         return 0;
 358                 }
 359         }
 360
 361         #ifdef DEBUG
 362         printf("failure: delete watchpoint addr %x\n", addr);
 363         #endif
 364
 365         return -1;
 366 }
 367
 368 #define CODE_BREAK_NUM  6
 369 #define CODE_BREAK_LOW  0x01
 370 #define CODE_BREAK_HIGH 0x02
 371
 372 struct code_hw_breakpoint {
 373         stm32_addr_t addr;
 374         int          type;
 375 };
 376
 377 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 378
 379 static void init_code_breakpoints(stlink_t *sl) {
 380         memset(sl->q_buf, 0, 4);
 381         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 382         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 383         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 384
 385         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 386                 code_breaks[i].type = 0;
 387                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 388         }
 389 }
 390
 391 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 392         stm32_addr_t fpb_addr = addr & ~0x3;
 393         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 394
 395         if(addr & 1) {
 396                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 397                 return -1;
 398         }
 399
 400         int id = -1;
 401         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 402                 if(fpb_addr == code_breaks[i].addr ||
 403                         (set && code_breaks[i].type == 0)) {
 404                         id = i;
 405                         break;
 406                 }
 407         }
 408
 409         if(id == -1) {
 410                 if(set) return -1; // Free slot not found
 411                 else    return 0;  // Breakpoint is already removed
 412         }
 413
 414         struct code_hw_breakpoint* brk = &code_breaks[id];
 415
 416         brk->addr = fpb_addr;
 417
 418         if(set) brk->type |= type;
 419         else    brk->type &= ~type;
 420
 421         if(brk->type == 0) {
 422                 #ifdef DEBUG
 423                 printf("clearing hw break %d\n", id);
 424                 #endif
 425
 426                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 427         } else {
 428                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 429
 430                 #ifdef DEBUG
 431                 printf("setting hw break %d at %08x (%d)\n",
 432                         id, brk->addr, brk->type);
 433                 printf("reg %08x \n",
 434                         mask);
 435                 #endif
 436
 437                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 438         }
 439
 440         return 0;
 441 }
 442
 443
 444 struct flash_block {
 445         stm32_addr_t addr;
 446         unsigned     length;
 447         uint8_t*     data;
 448
 449         struct flash_block* next;
 450 };
 451
 452 static struct flash_block* flash_root;
 453
 454 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 455
 456         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 457                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 458                 return -1;
 459         }
 460
 461         stlink_calculate_pagesize(sl, addr);
 462         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 463                 fprintf(stderr, "flash_add_block: unaligned block\n");
 464                 return -1;
 465         }
 466
 467         struct flash_block* new = malloc(sizeof(struct flash_block));
 468         new->next = flash_root;
 469
 470         new->addr   = addr;
 471         new->length = length;
 472         new->data   = calloc(length, 1);
 473
 474         flash_root = new;
 475
 476         return 0;
 477 }
 478
 479 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 480         unsigned int fit_blocks = 0, fit_length = 0;
 481
 482         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 483                 /* Block: ------X------Y--------
 484                  * Data:            a-----b
 485                  *                a--b
 486                  *            a-----------b
 487                  * Block intersects with data, if:
 488                  *  a < Y && b > x
 489                  */
 490
 491                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 492                 unsigned a = addr, b = addr + length;
 493                 if(a < Y && b > X) {
 494                         // from start of the block
 495                         unsigned start = (a > X ? a : X) - X;
 496                         unsigned end   = (b > Y ? Y : b) - X;
 497
 498                         memcpy(fb->data + start, data, end - start);
 499
 500                         fit_blocks++;
 501                         fit_length += end - start;
 502                 }
 503         }
 504
 505         if(fit_blocks == 0) {
 506                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 507                 return -1;
 508         }
 509
 510         if(fit_length != length) {
 511                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 512                         addr, length, fit_length);
 513                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int flash_go(stlink_t *sl) {
 520         int error = -1;
 521
 522         // Some kinds of clock settings do not allow writing to flash.
 523         stlink_reset(sl);
 524
 525         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 526                 #ifdef DEBUG
 527                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 528                 #endif
 529
 530                 unsigned length = fb->length;
 531                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 532
 533                         //Update FLASH_PAGE
 534                         stlink_calculate_pagesize(sl, page);
 535
 536                         #ifdef DEBUG
 537                         printf("flash_do: page %08x\n", page);
 538                         #endif
 539
 540                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 541                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 542                                 goto error;
 543                         }
 544         }
 545
 546         stlink_reset(sl);
 547
 548         error = 0;
 549
 550 error:
 551         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 552                 next = fb->next;
 553                 free(fb->data);
 554                 free(fb);
 555         }
 556
 557         flash_root = NULL;
 558
 559         return error;
 560 }
 561
 562 int serve(stlink_t *sl, int port) {
 563         int sock = socket(AF_INET, SOCK_STREAM, 0);
 564         if(sock < 0) {
 565                 perror("socket");
 566                 return 1;
 567         }
 568
 569         unsigned int val = 1;
 570         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 571
 572         struct sockaddr_in serv_addr;
 573         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 574         serv_addr.sin_family = AF_INET;
 575         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 576         serv_addr.sin_port = htons(port);
 577
 578         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 579                 perror("bind");
 580                 return 1;
 581         }
 582
 583         if(listen(sock, 5) < 0) {
 584                 perror("listen");
 585                 return 1;
 586         }
 587
 588         stlink_force_debug(sl);
 589         stlink_reset(sl);
 590         init_code_breakpoints(sl);
 591         init_data_watchpoints(sl);
 592
 593         printf("Listening at *:%d...\n", port);
 594
 595         int client = accept(sock, NULL, NULL);
 596         //signal (SIGINT, SIG_DFL);
 597         if(client < 0) {
 598                 perror("accept");
 599                 return 1;
 600         }
 601
 602         close(sock);
 603
 604         printf("GDB connected.\n");
 605
 606         /*
 607          * To allow resetting the chip from GDB it is required to
 608          * emulate attaching and detaching to target.
 609          */
 610         unsigned int attached = 1;
 611
 612         while(1) {
 613                 char* packet;
 614
 615                 int status = gdb_recv_packet(client, &packet);
 616                 if(status < 0) {
 617                         fprintf(stderr, "cannot recv: %d\n", status);
 618                         return 1;
 619                 }
 620
 621                 #ifdef DEBUG
 622                 printf("recv: %s\n", packet);
 623                 #endif
 624
 625                 char* reply = NULL;
 626                 reg regp;
 627
 628                 switch(packet[0]) {
 629                 case 'q': {
 630                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 631                                 reply = strdup("");
 632                                 break;
 633                         }
 634
 635                         char *separator = strstr(packet, ":"), *params = "";
 636                         if(separator == NULL) {
 637                                 separator = packet + strlen(packet);
 638                         } else {
 639                                 params = separator + 1;
 640                         }
 641
 642                         unsigned queryNameLength = (separator - &packet[1]);
 643                         char* queryName = calloc(queryNameLength + 1, 1);
 644                         strncpy(queryName, &packet[1], queryNameLength);
 645
 646                         #ifdef DEBUG
 647                         printf("query: %s;%s\n", queryName, params);
 648                         #endif
 649
 650                         if(!strcmp(queryName, "Supported")) {
 651                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 652                         } else if(!strcmp(queryName, "Xfer")) {
 653                                 char *type, *op, *__s_addr, *s_length;
 654                                 char *tok = params;
 655                                 char *annex __attribute__((unused));
 656
 657                                 type     = strsep(&tok, ":");
 658                                 op       = strsep(&tok, ":");
 659                                 annex    = strsep(&tok, ":");
 660                                 __s_addr   = strsep(&tok, ",");
 661                                 s_length = tok;
 662
 663                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 664                                        length = strtoul(s_length, NULL, 16);
 665
 666                                 #ifdef DEBUG
 667                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 668                                         type, op, annex, addr, length);
 669                                 #endif
 670
 671                                 const char* data = NULL;
 672
 673                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 674                                         data = current_memory_map;
 675
 676                                 if(data) {
 677                                         unsigned data_length = strlen(data);
 678                                         if(addr + length > data_length)
 679                                                 length = data_length - addr;
 680
 681                                         if(length == 0) {
 682                                                 reply = strdup("l");
 683                                         } else {
 684                                                 reply = calloc(length + 2, 1);
 685                                                 reply[0] = 'm';
 686                                                 strncpy(&reply[1], data, length);
 687                                         }
 688                                 }
 689                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 690                                 // Rcmd uses the wrong separator
 691                                 char *separator = strstr(packet, ","), *params = "";
 692                                 if(separator == NULL) {
 693                                         separator = packet + strlen(packet);
 694                                 } else {
 695                                         params = separator + 1;
 696                                 }
 697
 698
 699                                 if (!strncmp(params,"7265",4)) {// resume
 700 #ifdef DEBUG
 701                                         printf("Rcmd: resume\n");
 702 #endif
 703                                         stlink_run(sl);
 704
 705                                         reply = strdup("OK");
 706                                 } else if (!strncmp(params,"6861",4)) { //half
 707                                         reply = strdup("OK");
 708
 709                                         stlink_force_debug(sl);
 710
 711 #ifdef DEBUG
 712                                         printf("Rcmd: halt\n");
 713 #endif
 714                                 } else if (!strncmp(params,"7265",4)) { //reset
 715                                         reply = strdup("OK");
 716
 717                                         stlink_force_debug(sl);
 718                                         stlink_reset(sl);
 719                                         init_code_breakpoints(sl);
 720                                         init_data_watchpoints(sl);
 721
 722 #ifdef DEBUG
 723                                         printf("Rcmd: reset\n");
 724 #endif
 725                                 } else {
 726 #ifdef DEBUG
 727                                         printf("Rcmd: %s\n", params);
 728 #endif
 729
 730                                 }
 731
 732                         }
 733
 734                         if(reply == NULL)
 735                                 reply = strdup("");
 736
 737                         free(queryName);
 738
 739                         break;
 740                 }
 741
 742                 case 'v': {
 743                         char *params = NULL;
 744                         char *cmdName = strtok_r(packet, ":;", &params);
 745
 746                         cmdName++; // vCommand -> Command
 747
 748                         if(!strcmp(cmdName, "FlashErase")) {
 749                                 char *__s_addr, *s_length;
 750                                 char *tok = params;
 751
 752                                 __s_addr   = strsep(&tok, ",");
 753                                 s_length = tok;
 754
 755                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 756                                        length = strtoul(s_length, NULL, 16);
 757
 758                                 #ifdef DEBUG
 759                                 printf("FlashErase: addr:%08x,len:%04x\n",
 760                                         addr, length);
 761                                 #endif
 762
 763                                 if(flash_add_block(addr, length, sl) < 0) {
 764                                         reply = strdup("E00");
 765                                 } else {
 766                                         reply = strdup("OK");
 767                                 }
 768                         } else if(!strcmp(cmdName, "FlashWrite")) {
 769                                 char *__s_addr, *data;
 770                                 char *tok = params;
 771
 772                                 __s_addr = strsep(&tok, ":");
 773                                 data   = tok;
 774
 775                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 776                                 unsigned data_length = status - (data - packet);
 777
 778                                 // Length of decoded data cannot be more than
 779                                 // encoded, as escapes are removed.
 780                                 // Additional byte is reserved for alignment fix.
 781                                 uint8_t *decoded = calloc(data_length + 1, 1);
 782                                 unsigned dec_index = 0;
 783                                 for(unsigned int i = 0; i < data_length; i++) {
 784                                         if(data[i] == 0x7d) {
 785                                                 i++;
 786                                                 decoded[dec_index++] = data[i] ^ 0x20;
 787                                         } else {
 788                                                 decoded[dec_index++] = data[i];
 789                                         }
 790                                 }
 791
 792                                 // Fix alignment
 793                                 if(dec_index % 2 != 0)
 794                                         dec_index++;
 795
 796                                 #ifdef DEBUG
 797                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 798                                 #endif
 799
 800                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 801                                         reply = strdup("E00");
 802                                 } else {
 803                                         reply = strdup("OK");
 804                                 }
 805                         } else if(!strcmp(cmdName, "FlashDone")) {
 806                                 if(flash_go(sl) < 0) {
 807                                         reply = strdup("E00");
 808                                 } else {
 809                                         reply = strdup("OK");
 810                                 }
 811                         } else if(!strcmp(cmdName, "Kill")) {
 812                                 attached = 0;
 813
 814                                 reply = strdup("OK");
 815                         }
 816
 817                         if(reply == NULL)
 818                                 reply = strdup("");
 819
 820                         break;
 821                 }
 822
 823                 case 'c':
 824                         stlink_run(sl);
 825
 826                         while(1) {
 827                                 int status = gdb_check_for_interrupt(client);
 828                                 if(status < 0) {
 829                                         fprintf(stderr, "cannot check for int: %d\n", status);
 830                                         return 1;
 831                                 }
 832
 833                                 if(status == 1) {
 834                                         stlink_force_debug(sl);
 835                                         break;
 836                                 }
 837
 838                                 stlink_status(sl);
 839                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 840                                         break;
 841                                 }
 842
 843                                 usleep(100000);
 844                         }
 845
 846                         reply = strdup("S05"); // TRAP
 847                         break;
 848
 849                 case 's':
 850                         stlink_step(sl);
 851
 852                         reply = strdup("S05"); // TRAP
 853                         break;
 854
 855                 case '?':
 856                         if(attached) {
 857                                 reply = strdup("S05"); // TRAP
 858                         } else {
 859                                 /* Stub shall reply OK if not attached. */
 860                                 reply = strdup("OK");
 861                         }
 862                         break;
 863
 864                 case 'g':
 865                         stlink_read_all_regs(sl, &regp);
 866
 867                         reply = calloc(8 * 16 + 1, 1);
 868                         for(int i = 0; i < 16; i++)
 869                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 870
 871                         break;
 872
 873                 case 'p': {
 874                         unsigned id = strtoul(&packet[1], NULL, 16);
 875                         unsigned myreg = 0xDEADDEAD;
 876
 877                         if(id < 16) {
 878                                 stlink_read_reg(sl, id, &regp);
 879                                 myreg = htonl(regp.r[id]);
 880                         } else if(id == 0x19) {
 881                                 stlink_read_reg(sl, 16, &regp);
 882                                 myreg = htonl(regp.xpsr);
 883                         } else {
 884                                 reply = strdup("E00");
 885                         }
 886
 887                         reply = calloc(8 + 1, 1);
 888                         sprintf(reply, "%08x", myreg);
 889
 890                         break;
 891                 }
 892
 893                 case 'P': {
 894                         char* s_reg = &packet[1];
 895                         char* s_value = strstr(&packet[1], "=") + 1;
 896
 897                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 898                         unsigned value = strtoul(s_value, NULL, 16);
 899
 900                         if(reg < 16) {
 901                                 stlink_write_reg(sl, ntohl(value), reg);
 902                         } else if(reg == 0x19) {
 903                                 stlink_write_reg(sl, ntohl(value), 16);
 904                         } else {
 905                                 reply = strdup("E00");
 906                         }
 907
 908                         if(!reply) {
 909                                 reply = strdup("OK");
 910                         }
 911
 912                         break;
 913                 }
 914
 915                 case 'G':
 916                         for(int i = 0; i < 16; i++) {
 917                                 char str[9] = {0};
 918                                 strncpy(str, &packet[1 + i * 8], 8);
 919                                 uint32_t reg = strtoul(str, NULL, 16);
 920                                 stlink_write_reg(sl, ntohl(reg), i);
 921                         }
 922
 923                         reply = strdup("OK");
 924                         break;
 925
 926                 case 'm': {
 927                         char* s_start = &packet[1];
 928                         char* s_count = strstr(&packet[1], ",") + 1;
 929
 930                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 931                         unsigned     count = strtoul(s_count, NULL, 16);
 932
 933                         unsigned adj_start = start % 4;
 934
 935                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 936                                                 count : count + 4 - (count % 4));
 937
 938                         reply = calloc(count * 2 + 1, 1);
 939                         for(unsigned int i = 0; i < count; i++) {
 940                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 941                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 942                         }
 943
 944                         break;
 945                 }
 946
 947                 case 'M': {
 948                         char* s_start = &packet[1];
 949                         char* s_count = strstr(&packet[1], ",") + 1;
 950                         char* hexdata = strstr(packet, ":") + 1;
 951
 952                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 953                         unsigned     count = strtoul(s_count, NULL, 16);
 954
 955                         for(unsigned int i = 0; i < count; i ++) {
 956                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 957                                 uint8_t byte = strtoul(hex, NULL, 16);
 958                                 sl->q_buf[i] = byte;
 959                         }
 960
 961                         if((count % 4) == 0 && (start % 4) == 0) {
 962                                 stlink_write_mem32(sl, start, count);
 963                         } else {
 964                                 stlink_write_mem8(sl, start, count);
 965                         }
 966
 967                         reply = strdup("OK");
 968
 969                         break;
 970                 }
 971
 972                 case 'Z': {
 973                         char *endptr;
 974                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 975                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 976
 977                         switch (packet[1]) {
 978                                 case '1':
 979                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 980                                         reply = strdup("E00");
 981                                 } else {
 982                                         reply = strdup("OK");
 983                                 }
 984                                 break;
 985
 986                                 case '2':   // insert write watchpoint
 987                                 case '3':   // insert read  watchpoint
 988                                 case '4':   // insert access watchpoint
 989                                 {
 990                                         enum watchfun wf;
 991                                         if(packet[1] == '2') {
 992                                                 wf = WATCHWRITE;
 993                                         } else if(packet[1] == '3') {
 994                                                 wf = WATCHREAD;
 995                                         } else {
 996                                                 wf = WATCHACCESS;
 997                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 998                                                         reply = strdup("E00");
 999                                                 } else {
1000                                                         reply = strdup("OK");
1001                                                         break;
1002                                                 }
1003                                         }
1004                                 }
1005
1006                                 default:
1007                                 reply = strdup("");
1008                         }
1009                         break;
1010                 }
1011                 case 'z': {
1012                         char *endptr;
1013                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1014                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1015
1016                         switch (packet[1]) {
1017                                 case '1': // remove breakpoint
1018                                 update_code_breakpoint(sl, addr, 0);
1019                                 reply = strdup("OK");
1020                                 break;
1021
1022                                 case '2' : // remove write watchpoint
1023                                 case '3' : // remove read watchpoint
1024                                 case '4' : // remove access watchpoint
1025                                 if(delete_data_watchpoint(sl, addr) < 0) {
1026                                         reply = strdup("E00");
1027                                 } else {
1028                                         reply = strdup("OK");
1029                                         break;
1030                                 }
1031
1032                                 default:
1033                                 reply = strdup("");
1034                         }
1035                         break;
1036                 }
1037
1038                 case '!': {
1039                         /*
1040                          * Enter extended mode which allows restarting.
1041                          * We do support that always.
1042                          */
1043
1044                         reply = strdup("OK");
1045
1046                         break;
1047                 }
1048
1049                 case 'R': {
1050                         /* Reset the core. */
1051
1052                         stlink_reset(sl);
1053                         init_code_breakpoints(sl);
1054                         init_data_watchpoints(sl);
1055
1056                         attached = 1;
1057
1058                         reply = strdup("OK");
1059
1060                         break;
1061                 }
1062
1063                 default:
1064                         reply = strdup("");
1065                 }
1066
1067                 if(reply) {
1068                         #ifdef DEBUG
1069                         printf("send: %s\n", reply);
1070                         #endif
1071
1072                         int result = gdb_send_packet(client, reply);
1073                         if(result != 0) {
1074                                 fprintf(stderr, "cannot send: %d\n", result);
1075                                 return 1;
1076                         }
1077
1078                         free(reply);
1079                 }
1080
1081                 free(packet);
1082         }
1083
1084         return 0;
1085 }