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=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 202   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 203   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 204   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 205   "  </memory>"
 206   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 207   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 208   "  </memory>"
 209   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 210   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 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=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 215   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 216   "</memory-map>";
 217
 218 static const char* const memory_map_template =
 219   "<?xml version=\"1.0\"?>"
 220   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 221   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 222   "<memory-map>"
 223   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 224   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 225   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 226   "    <property name=\"blocksize\">0x%zx</property>"
 227   "  </memory>"
 228   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 229   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 230   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 231   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 232   "</memory-map>";
 233
 234 char* make_memory_map(stlink_t *sl) {
 235         /* This will be freed in serve() */
 236         char* map = malloc(4096);
 237         map[0] = '\0';
 238
 239         if(sl->chip_id==STM32_CHIPID_F4) {
 240         strcpy(map, memory_map_template_F4);
 241     } else {
 242         snprintf(map, 4096, memory_map_template,
 243                         sl->flash_size,
 244                         sl->sram_size,
 245                         sl->flash_size, sl->flash_pgsz,
 246                         sl->sys_base, sl->sys_size);
 247     }
 248         return map;
 249 }
 250
 251
 252 /*
 253  * DWT_COMP0     0xE0001020
 254  * DWT_MASK0     0xE0001024
 255  * DWT_FUNCTION0 0xE0001028
 256  * DWT_COMP1     0xE0001030
 257  * DWT_MASK1     0xE0001034
 258  * DWT_FUNCTION1 0xE0001038
 259  * DWT_COMP2     0xE0001040
 260  * DWT_MASK2     0xE0001044
 261  * DWT_FUNCTION2 0xE0001048
 262  * DWT_COMP3     0xE0001050
 263  * DWT_MASK3     0xE0001054
 264  * DWT_FUNCTION3 0xE0001058
 265  */
 266
 267 #define DATA_WATCH_NUM 4
 268
 269 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 270
 271 struct code_hw_watchpoint {
 272         stm32_addr_t addr;
 273         uint8_t mask;
 274         enum watchfun fun;
 275 };
 276
 277 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 278
 279 static void init_data_watchpoints(stlink_t *sl) {
 280         #ifdef DEBUG
 281         printf("init watchpoints\n");
 282         #endif
 283
 284         // set trcena in debug command to turn on dwt unit
 285         stlink_write_debug32(sl, 0xE000EDFC,
 286                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 287
 288         // make sure all watchpoints are cleared
 289         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 290                 data_watches[i].fun = WATCHDISABLED;
 291                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 292         }
 293 }
 294
 295 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 296 {
 297         int i = 0;
 298         uint32_t mask;
 299
 300         // computer mask
 301         // find a free watchpoint
 302         // configure
 303
 304         mask = -1;
 305         i = len;
 306         while(i) {
 307                 i >>= 1;
 308                 mask++;
 309         }
 310
 311         if((mask != (uint32_t)-1) && (mask < 16)) {
 312                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 313                         // is this an empty slot ?
 314                         if(data_watches[i].fun == WATCHDISABLED) {
 315                                 #ifdef DEBUG
 316                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 317                                 #endif
 318
 319                                 data_watches[i].fun = wf;
 320                                 data_watches[i].addr = addr;
 321                                 data_watches[i].mask = mask;
 322
 323                                 // insert comparator address
 324                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 325
 326                                 // insert mask
 327                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 328
 329                                 // insert function
 330                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 331
 332                                 // just to make sure the matched bit is clear !
 333                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 334                                 return 0;
 335                         }
 336                 }
 337         }
 338
 339         #ifdef DEBUG
 340         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 341         #endif
 342         return -1;
 343 }
 344
 345 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 346 {
 347         int i;
 348
 349         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 350                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 351                         #ifdef DEBUG
 352                         printf("delete watchpoint %d addr %x\n", i, addr);
 353                         #endif
 354
 355                         data_watches[i].fun = WATCHDISABLED;
 356                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 357
 358                         return 0;
 359                 }
 360         }
 361
 362         #ifdef DEBUG
 363         printf("failure: delete watchpoint addr %x\n", addr);
 364         #endif
 365
 366         return -1;
 367 }
 368
 369 #define CODE_BREAK_NUM  6
 370 #define CODE_BREAK_LOW  0x01
 371 #define CODE_BREAK_HIGH 0x02
 372
 373 struct code_hw_breakpoint {
 374         stm32_addr_t addr;
 375         int          type;
 376 };
 377
 378 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 379
 380 static void init_code_breakpoints(stlink_t *sl) {
 381         memset(sl->q_buf, 0, 4);
 382         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 383         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 384         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 385
 386         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 387                 code_breaks[i].type = 0;
 388                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 389         }
 390 }
 391
 392 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 393         stm32_addr_t fpb_addr = addr & ~0x3;
 394         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 395
 396         if(addr & 1) {
 397                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 398                 return -1;
 399         }
 400
 401         int id = -1;
 402         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 403                 if(fpb_addr == code_breaks[i].addr ||
 404                         (set && code_breaks[i].type == 0)) {
 405                         id = i;
 406                         break;
 407                 }
 408         }
 409
 410         if(id == -1) {
 411                 if(set) return -1; // Free slot not found
 412                 else    return 0;  // Breakpoint is already removed
 413         }
 414
 415         struct code_hw_breakpoint* brk = &code_breaks[id];
 416
 417         brk->addr = fpb_addr;
 418
 419         if(set) brk->type |= type;
 420         else    brk->type &= ~type;
 421
 422         if(brk->type == 0) {
 423                 #ifdef DEBUG
 424                 printf("clearing hw break %d\n", id);
 425                 #endif
 426
 427                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 428         } else {
 429                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 430
 431                 #ifdef DEBUG
 432                 printf("setting hw break %d at %08x (%d)\n",
 433                         id, brk->addr, brk->type);
 434                 printf("reg %08x \n",
 435                         mask);
 436                 #endif
 437
 438                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 439         }
 440
 441         return 0;
 442 }
 443
 444
 445 struct flash_block {
 446         stm32_addr_t addr;
 447         unsigned     length;
 448         uint8_t*     data;
 449
 450         struct flash_block* next;
 451 };
 452
 453 static struct flash_block* flash_root;
 454
 455 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 456
 457         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 458                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 459                 return -1;
 460         }
 461
 462         stlink_calculate_pagesize(sl, addr);
 463         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 464                 fprintf(stderr, "flash_add_block: unaligned block\n");
 465                 return -1;
 466         }
 467
 468         struct flash_block* new = malloc(sizeof(struct flash_block));
 469         new->next = flash_root;
 470
 471         new->addr   = addr;
 472         new->length = length;
 473         new->data   = calloc(length, 1);
 474
 475         flash_root = new;
 476
 477         return 0;
 478 }
 479
 480 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 481         unsigned int fit_blocks = 0, fit_length = 0;
 482
 483         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 484                 /* Block: ------X------Y--------
 485                  * Data:            a-----b
 486                  *                a--b
 487                  *            a-----------b
 488                  * Block intersects with data, if:
 489                  *  a < Y && b > x
 490                  */
 491
 492                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 493                 unsigned a = addr, b = addr + length;
 494                 if(a < Y && b > X) {
 495                         // from start of the block
 496                         unsigned start = (a > X ? a : X) - X;
 497                         unsigned end   = (b > Y ? Y : b) - X;
 498
 499                         memcpy(fb->data + start, data, end - start);
 500
 501                         fit_blocks++;
 502                         fit_length += end - start;
 503                 }
 504         }
 505
 506         if(fit_blocks == 0) {
 507                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 508                 return -1;
 509         }
 510
 511         if(fit_length != length) {
 512                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 513                         addr, length, fit_length);
 514                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int flash_go(stlink_t *sl) {
 521         int error = -1;
 522
 523         // Some kinds of clock settings do not allow writing to flash.
 524         stlink_reset(sl);
 525
 526         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 527                 #ifdef DEBUG
 528                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 529                 #endif
 530
 531                 unsigned length = fb->length;
 532                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 533
 534                         //Update FLASH_PAGE
 535                         stlink_calculate_pagesize(sl, page);
 536
 537                         #ifdef DEBUG
 538                         printf("flash_do: page %08x\n", page);
 539                         #endif
 540
 541                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 542                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 543                                 goto error;
 544                         }
 545         }
 546
 547         stlink_reset(sl);
 548
 549         error = 0;
 550
 551 error:
 552         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 553                 next = fb->next;
 554                 free(fb->data);
 555                 free(fb);
 556         }
 557
 558         flash_root = NULL;
 559
 560         return error;
 561 }
 562
 563 int serve(stlink_t *sl, int port) {
 564         int sock = socket(AF_INET, SOCK_STREAM, 0);
 565         if(sock < 0) {
 566                 perror("socket");
 567                 return 1;
 568         }
 569
 570         unsigned int val = 1;
 571         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 572
 573         struct sockaddr_in serv_addr;
 574         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 575         serv_addr.sin_family = AF_INET;
 576         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 577         serv_addr.sin_port = htons(port);
 578
 579         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 580                 perror("bind");
 581                 return 1;
 582         }
 583
 584         if(listen(sock, 5) < 0) {
 585                 perror("listen");
 586                 return 1;
 587         }
 588
 589         stlink_force_debug(sl);
 590         stlink_reset(sl);
 591         init_code_breakpoints(sl);
 592         init_data_watchpoints(sl);
 593
 594         printf("Listening at *:%d...\n", port);
 595
 596         int client = accept(sock, NULL, NULL);
 597         //signal (SIGINT, SIG_DFL);
 598         if(client < 0) {
 599                 perror("accept");
 600                 return 1;
 601         }
 602
 603         close(sock);
 604
 605         printf("GDB connected.\n");
 606
 607         /*
 608          * To allow resetting the chip from GDB it is required to
 609          * emulate attaching and detaching to target.
 610          */
 611         unsigned int attached = 1;
 612
 613         while(1) {
 614                 char* packet;
 615
 616                 int status = gdb_recv_packet(client, &packet);
 617                 if(status < 0) {
 618                         fprintf(stderr, "cannot recv: %d\n", status);
 619                         return 1;
 620                 }
 621
 622                 #ifdef DEBUG
 623                 printf("recv: %s\n", packet);
 624                 #endif
 625
 626                 char* reply = NULL;
 627                 reg regp;
 628
 629                 switch(packet[0]) {
 630                 case 'q': {
 631                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 632                                 reply = strdup("");
 633                                 break;
 634                         }
 635
 636                         char *separator = strstr(packet, ":"), *params = "";
 637                         if(separator == NULL) {
 638                                 separator = packet + strlen(packet);
 639                         } else {
 640                                 params = separator + 1;
 641                         }
 642
 643                         unsigned queryNameLength = (separator - &packet[1]);
 644                         char* queryName = calloc(queryNameLength + 1, 1);
 645                         strncpy(queryName, &packet[1], queryNameLength);
 646
 647                         #ifdef DEBUG
 648                         printf("query: %s;%s\n", queryName, params);
 649                         #endif
 650
 651                         if(!strcmp(queryName, "Supported")) {
 652                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 653                         } else if(!strcmp(queryName, "Xfer")) {
 654                                 char *type, *op, *__s_addr, *s_length;
 655                                 char *tok = params;
 656                                 char *annex __attribute__((unused));
 657
 658                                 type     = strsep(&tok, ":");
 659                                 op       = strsep(&tok, ":");
 660                                 annex    = strsep(&tok, ":");
 661                                 __s_addr   = strsep(&tok, ",");
 662                                 s_length = tok;
 663
 664                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 665                                        length = strtoul(s_length, NULL, 16);
 666
 667                                 #ifdef DEBUG
 668                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 669                                         type, op, annex, addr, length);
 670                                 #endif
 671
 672                                 const char* data = NULL;
 673
 674                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 675                                         data = current_memory_map;
 676
 677                                 if(data) {
 678                                         unsigned data_length = strlen(data);
 679                                         if(addr + length > data_length)
 680                                                 length = data_length - addr;
 681
 682                                         if(length == 0) {
 683                                                 reply = strdup("l");
 684                                         } else {
 685                                                 reply = calloc(length + 2, 1);
 686                                                 reply[0] = 'm';
 687                                                 strncpy(&reply[1], data, length);
 688                                         }
 689                                 }
 690                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 691                                 // Rcmd uses the wrong separator
 692                                 char *separator = strstr(packet, ","), *params = "";
 693                                 if(separator == NULL) {
 694                                         separator = packet + strlen(packet);
 695                                 } else {
 696                                         params = separator + 1;
 697                                 }
 698
 699
 700                                 if (!strncmp(params,"726573756d65",12)) {// resume
 701 #ifdef DEBUG
 702                                         printf("Rcmd: resume\n");
 703 #endif
 704                                         stlink_run(sl);
 705
 706                                         reply = strdup("OK");
 707                 } else if (!strncmp(params,"68616c74",8)) { //halt
 708                                         reply = strdup("OK");
 709
 710                                         stlink_force_debug(sl);
 711
 712 #ifdef DEBUG
 713                                         printf("Rcmd: halt\n");
 714 #endif
 715                 } else if (!strncmp(params,"7265736574",10)) { //reset
 716                                         reply = strdup("OK");
 717
 718                                         stlink_force_debug(sl);
 719                                         stlink_reset(sl);
 720                                         init_code_breakpoints(sl);
 721                                         init_data_watchpoints(sl);
 722
 723 #ifdef DEBUG
 724                                         printf("Rcmd: reset\n");
 725 #endif
 726                                 } else {
 727 #ifdef DEBUG
 728                                         printf("Rcmd: %s\n", params);
 729 #endif
 730
 731                                 }
 732
 733                         }
 734
 735                         if(reply == NULL)
 736                                 reply = strdup("");
 737
 738                         free(queryName);
 739
 740                         break;
 741                 }
 742
 743                 case 'v': {
 744                         char *params = NULL;
 745                         char *cmdName = strtok_r(packet, ":;", &params);
 746
 747                         cmdName++; // vCommand -> Command
 748
 749                         if(!strcmp(cmdName, "FlashErase")) {
 750                                 char *__s_addr, *s_length;
 751                                 char *tok = params;
 752
 753                                 __s_addr   = strsep(&tok, ",");
 754                                 s_length = tok;
 755
 756                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 757                                        length = strtoul(s_length, NULL, 16);
 758
 759                                 #ifdef DEBUG
 760                                 printf("FlashErase: addr:%08x,len:%04x\n",
 761                                         addr, length);
 762                                 #endif
 763
 764                                 if(flash_add_block(addr, length, sl) < 0) {
 765                                         reply = strdup("E00");
 766                                 } else {
 767                                         reply = strdup("OK");
 768                                 }
 769                         } else if(!strcmp(cmdName, "FlashWrite")) {
 770                                 char *__s_addr, *data;
 771                                 char *tok = params;
 772
 773                                 __s_addr = strsep(&tok, ":");
 774                                 data   = tok;
 775
 776                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 777                                 unsigned data_length = status - (data - packet);
 778
 779                                 // Length of decoded data cannot be more than
 780                                 // encoded, as escapes are removed.
 781                                 // Additional byte is reserved for alignment fix.
 782                                 uint8_t *decoded = calloc(data_length + 1, 1);
 783                                 unsigned dec_index = 0;
 784                                 for(unsigned int i = 0; i < data_length; i++) {
 785                                         if(data[i] == 0x7d) {
 786                                                 i++;
 787                                                 decoded[dec_index++] = data[i] ^ 0x20;
 788                                         } else {
 789                                                 decoded[dec_index++] = data[i];
 790                                         }
 791                                 }
 792
 793                                 // Fix alignment
 794                                 if(dec_index % 2 != 0)
 795                                         dec_index++;
 796
 797                                 #ifdef DEBUG
 798                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 799                                 #endif
 800
 801                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 802                                         reply = strdup("E00");
 803                                 } else {
 804                                         reply = strdup("OK");
 805                                 }
 806                         } else if(!strcmp(cmdName, "FlashDone")) {
 807                                 if(flash_go(sl) < 0) {
 808                                         reply = strdup("E00");
 809                                 } else {
 810                                         reply = strdup("OK");
 811                                 }
 812                         } else if(!strcmp(cmdName, "Kill")) {
 813                                 attached = 0;
 814
 815                                 reply = strdup("OK");
 816                         }
 817
 818                         if(reply == NULL)
 819                                 reply = strdup("");
 820
 821                         break;
 822                 }
 823
 824                 case 'c':
 825                         stlink_run(sl);
 826
 827                         while(1) {
 828                                 int status = gdb_check_for_interrupt(client);
 829                                 if(status < 0) {
 830                                         fprintf(stderr, "cannot check for int: %d\n", status);
 831                                         return 1;
 832                                 }
 833
 834                                 if(status == 1) {
 835                                         stlink_force_debug(sl);
 836                                         break;
 837                                 }
 838
 839                                 stlink_status(sl);
 840                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 841                                         break;
 842                                 }
 843
 844                                 usleep(100000);
 845                         }
 846
 847                         reply = strdup("S05"); // TRAP
 848                         break;
 849
 850                 case 's':
 851                         stlink_step(sl);
 852
 853                         reply = strdup("S05"); // TRAP
 854                         break;
 855
 856                 case '?':
 857                         if(attached) {
 858                                 reply = strdup("S05"); // TRAP
 859                         } else {
 860                                 /* Stub shall reply OK if not attached. */
 861                                 reply = strdup("OK");
 862                         }
 863                         break;
 864
 865                 case 'g':
 866                         stlink_read_all_regs(sl, &regp);
 867
 868                         reply = calloc(8 * 16 + 1, 1);
 869                         for(int i = 0; i < 16; i++)
 870                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 871
 872                         break;
 873
 874                 case 'p': {
 875                         unsigned id = strtoul(&packet[1], NULL, 16);
 876                         unsigned myreg = 0xDEADDEAD;
 877
 878                         if(id < 16) {
 879                                 stlink_read_reg(sl, id, &regp);
 880                                 myreg = htonl(regp.r[id]);
 881                         } else if(id == 0x19) {
 882                                 stlink_read_reg(sl, 16, &regp);
 883                                 myreg = htonl(regp.xpsr);
 884                         } else {
 885                                 reply = strdup("E00");
 886                         }
 887
 888                         reply = calloc(8 + 1, 1);
 889                         sprintf(reply, "%08x", myreg);
 890
 891                         break;
 892                 }
 893
 894                 case 'P': {
 895                         char* s_reg = &packet[1];
 896                         char* s_value = strstr(&packet[1], "=") + 1;
 897
 898                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 899                         unsigned value = strtoul(s_value, NULL, 16);
 900
 901                         if(reg < 16) {
 902                                 stlink_write_reg(sl, ntohl(value), reg);
 903                         } else if(reg == 0x19) {
 904                                 stlink_write_reg(sl, ntohl(value), 16);
 905                         } else {
 906                                 reply = strdup("E00");
 907                         }
 908
 909                         if(!reply) {
 910                                 reply = strdup("OK");
 911                         }
 912
 913                         break;
 914                 }
 915
 916                 case 'G':
 917                         for(int i = 0; i < 16; i++) {
 918                                 char str[9] = {0};
 919                                 strncpy(str, &packet[1 + i * 8], 8);
 920                                 uint32_t reg = strtoul(str, NULL, 16);
 921                                 stlink_write_reg(sl, ntohl(reg), i);
 922                         }
 923
 924                         reply = strdup("OK");
 925                         break;
 926
 927                 case 'm': {
 928                         char* s_start = &packet[1];
 929                         char* s_count = strstr(&packet[1], ",") + 1;
 930
 931                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 932                         unsigned     count = strtoul(s_count, NULL, 16);
 933
 934                         unsigned adj_start = start % 4;
 935
 936                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 937                                                 count : count + 4 - (count % 4));
 938
 939                         reply = calloc(count * 2 + 1, 1);
 940                         for(unsigned int i = 0; i < count; i++) {
 941                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 942                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 943                         }
 944
 945                         break;
 946                 }
 947
 948                 case 'M': {
 949                         char* s_start = &packet[1];
 950                         char* s_count = strstr(&packet[1], ",") + 1;
 951                         char* hexdata = strstr(packet, ":") + 1;
 952
 953                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 954                         unsigned     count = strtoul(s_count, NULL, 16);
 955
 956                         for(unsigned int i = 0; i < count; i ++) {
 957                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 958                                 uint8_t byte = strtoul(hex, NULL, 16);
 959                                 sl->q_buf[i] = byte;
 960                         }
 961
 962                         if((count % 4) == 0 && (start % 4) == 0) {
 963                                 stlink_write_mem32(sl, start, count);
 964                         } else {
 965                                 stlink_write_mem8(sl, start, count);
 966                         }
 967
 968                         reply = strdup("OK");
 969
 970                         break;
 971                 }
 972
 973                 case 'Z': {
 974                         char *endptr;
 975                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 976                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 977
 978                         switch (packet[1]) {
 979                                 case '1':
 980                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 981                                         reply = strdup("E00");
 982                                 } else {
 983                                         reply = strdup("OK");
 984                                 }
 985                                 break;
 986
 987                                 case '2':   // insert write watchpoint
 988                                 case '3':   // insert read  watchpoint
 989                                 case '4':   // insert access watchpoint
 990                                 {
 991                                         enum watchfun wf;
 992                                         if(packet[1] == '2') {
 993                                                 wf = WATCHWRITE;
 994                                         } else if(packet[1] == '3') {
 995                                                 wf = WATCHREAD;
 996                                         } else {
 997                                                 wf = WATCHACCESS;
 998                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 999                                                         reply = strdup("E00");
1000                                                 } else {
1001                                                         reply = strdup("OK");
1002                                                         break;
1003                                                 }
1004                                         }
1005                                 }
1006
1007                                 default:
1008                                 reply = strdup("");
1009                         }
1010                         break;
1011                 }
1012                 case 'z': {
1013                         char *endptr;
1014                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1015                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1016
1017                         switch (packet[1]) {
1018                                 case '1': // remove breakpoint
1019                                 update_code_breakpoint(sl, addr, 0);
1020                                 reply = strdup("OK");
1021                                 break;
1022
1023                                 case '2' : // remove write watchpoint
1024                                 case '3' : // remove read watchpoint
1025                                 case '4' : // remove access watchpoint
1026                                 if(delete_data_watchpoint(sl, addr) < 0) {
1027                                         reply = strdup("E00");
1028                                 } else {
1029                                         reply = strdup("OK");
1030                                         break;
1031                                 }
1032
1033                                 default:
1034                                 reply = strdup("");
1035                         }
1036                         break;
1037                 }
1038
1039                 case '!': {
1040                         /*
1041                          * Enter extended mode which allows restarting.
1042                          * We do support that always.
1043                          */
1044
1045                         reply = strdup("OK");
1046
1047                         break;
1048                 }
1049
1050                 case 'R': {
1051                         /* Reset the core. */
1052
1053                         stlink_reset(sl);
1054                         init_code_breakpoints(sl);
1055                         init_data_watchpoints(sl);
1056
1057                         attached = 1;
1058
1059                         reply = strdup("OK");
1060
1061                         break;
1062                 }
1063
1064                 default:
1065                         reply = strdup("");
1066                 }
1067
1068                 if(reply) {
1069                         #ifdef DEBUG
1070                         printf("send: %s\n", reply);
1071                         #endif
1072
1073                         int result = gdb_send_packet(client, reply);
1074                         if(result != 0) {
1075                                 fprintf(stderr, "cannot send: %d\n", result);
1076                                 return 1;
1077                         }
1078
1079                         free(reply);
1080                 }
1081
1082                 free(packet);
1083         }
1084
1085         return 0;
1086 }