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