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

   1 /* -*- tab-width:8 -*- */
   2
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <signal.h>
  19
  20 #include <stlink-common.h>
  21
  22 #include "gdb-remote.h"
  23
  24 #define DEFAULT_LOGGING_LEVEL 50
  25 #define DEFAULT_GDB_LISTEN_PORT 4242
  26
  27 #define STRINGIFY_inner(name) #name
  28 #define STRINGIFY(name) STRINGIFY_inner(name)
  29
  30 #define FLASH_BASE 0x08000000
  31 #define FLASH_PAGE (sl->flash_pgsz)
  32 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  33 #define FLASH_SIZE (FLASH_PAGE * 128)
  34
  35 static const char hex[] = "0123456789abcdef";
  36
  37 static const char* current_memory_map = NULL;
  38
  39 /*
  40  * Chip IDs are explained in the appropriate programming manual for the
  41  * DBGMCU_IDCODE register (0xE0042000)
  42  */
  43
  44 #define CORE_M3_R1 0x1BA00477
  45 #define CORE_M3_R2 0x4BA00477
  46 #define CORE_M4_R0 0x2BA01477
  47
  48 typedef struct _st_state_t {
  49     // things from command line, bleh
  50     int stlink_version;
  51     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  52     char devicename[100];
  53     int logging_level;
  54         int listen_port;
  55 } st_state_t;
  56
  57
  58 int serve(stlink_t *sl, int port);
  59 char* make_memory_map(stlink_t *sl);
  60
  61
  62 int parse_options(int argc, char** argv, st_state_t *st) {
  63     static struct option long_options[] = {
  64         {"help", no_argument, NULL, 'h'},
  65         {"verbose", optional_argument, NULL, 'v'},
  66         {"device", required_argument, NULL, 'd'},
  67         {"stlink_version", required_argument, NULL, 's'},
  68         {"stlinkv1", no_argument, NULL, '1'},
  69                 {"listen_port", required_argument, NULL, 'p'},
  70         {0, 0, 0, 0},
  71     };
  72         const char * help_str = "%s - usage:\n\n"
  73         "  -h, --help\t\tPrint this help\n"
  74         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  75         "  -v, --verbose\tspecify generally verbose logging\n"
  76         "  -d <device>, --device=/dev/stlink2_1\n"
  77         "\t\t\tWhere is your stlink device connected?\n"
  78         "  -s X, --stlink_version=X\n"
  79         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  80         "  -1, --stlinkv1\tForce stlink version 1\n"
  81         "  -p 4242, --listen_port=1234\n"
  82         "\t\t\tSet the gdb server listen port. "
  83         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  84         ;
  85
  86
  87     int option_index = 0;
  88     int c;
  89     int q;
  90     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  91         switch (c) {
  92         case 0:
  93             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  94             printf("option %s", long_options[option_index].name);
  95             if (optarg) {
  96                 printf(" with arg %s", optarg);
  97             }
  98             printf("\n");
  99             break;
 100         case 'h':
 101             printf(help_str, argv[0]);
 102             exit(EXIT_SUCCESS);
 103             break;
 104         case 'v':
 105             if (optarg) {
 106                 st->logging_level = atoi(optarg);
 107             } else {
 108                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 109             }
 110             break;
 111         case 'd':
 112             if (strlen(optarg) > sizeof (st->devicename)) {
 113                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 114             } else {
 115                 strcpy(st->devicename, optarg);
 116             }
 117             break;
 118                 case '1':
 119                         st->stlink_version = 1;
 120                         break;
 121                 case 's':
 122                         sscanf(optarg, "%i", &q);
 123                         if (q < 0 || q > 2) {
 124                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 125                                 exit(EXIT_FAILURE);
 126                         }
 127                         st->stlink_version = q;
 128                         break;
 129                 case 'p':
 130                         sscanf(optarg, "%i", &q);
 131                         if (q < 0) {
 132                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 133                                 exit(EXIT_FAILURE);
 134                         }
 135                         st->listen_port = q;
 136                         break;
 137         }
 138     }
 139
 140     if (optind < argc) {
 141         printf("non-option ARGV-elements: ");
 142         while (optind < argc)
 143             printf("%s ", argv[optind++]);
 144         printf("\n");
 145     }
 146     return 0;
 147 }
 148
 149
 150 int main(int argc, char** argv) {
 151
 152         stlink_t *sl = NULL;
 153
 154         st_state_t state;
 155         memset(&state, 0, sizeof(state));
 156         // set defaults...
 157         state.stlink_version = 2;
 158         state.logging_level = DEFAULT_LOGGING_LEVEL;
 159         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 160         parse_options(argc, argv, &state);
 161         switch (state.stlink_version) {
 162         case 2:
 163                 sl = stlink_open_usb(state.logging_level);
 164                 if(sl == NULL) return 1;
 165                 break;
 166         case 1:
 167                 sl = stlink_v1_open(state.logging_level);
 168                 if(sl == NULL) return 1;
 169                 break;
 170     }
 171
 172         uint32_t chip_id = sl->chip_id;
 173         uint32_t core_id = sl->core_id;
 174
 175         /* Fix chip_id for F4 */
 176         if (((chip_id & 0xFFF) == 0x411) && (core_id == CORE_M4_R0)) {
 177           printf("Fixing wrong chip_id for STM32F4 Rev A errata\n");
 178           chip_id = 0x413;
 179         }
 180
 181         printf("Chip ID is %08x, Core ID is  %08x.\n", chip_id, core_id);
 182
 183         current_memory_map = make_memory_map(sl);
 184
 185         while(serve(sl, state.listen_port) == 0);
 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 =
 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=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 201   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 202   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 203   "    <property name=\"blocksize\">0x%x</property>"
 204   "  </memory>"
 205   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 206   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 207   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 208   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 209   "</memory-map>";
 210
 211 char* make_memory_map(stlink_t *sl) {
 212         /* This will be freed in serve() */
 213         char* map = malloc(4096);
 214         map[0] = '\0';
 215
 216         snprintf(map, 4096, memory_map_template,
 217                         sl->flash_size,
 218                         sl->sram_size,
 219                         sl->flash_size, sl->flash_pgsz,
 220                         sl->sys_base, sl->sys_size);
 221
 222         return map;
 223 }
 224
 225
 226 /*
 227  * DWT_COMP0     0xE0001020
 228  * DWT_MASK0     0xE0001024
 229  * DWT_FUNCTION0 0xE0001028
 230  * DWT_COMP1     0xE0001030
 231  * DWT_MASK1     0xE0001034
 232  * DWT_FUNCTION1 0xE0001038
 233  * DWT_COMP2     0xE0001040
 234  * DWT_MASK2     0xE0001044
 235  * DWT_FUNCTION2 0xE0001048
 236  * DWT_COMP3     0xE0001050
 237  * DWT_MASK3     0xE0001054
 238  * DWT_FUNCTION3 0xE0001058
 239  */
 240
 241 #define DATA_WATCH_NUM 4
 242
 243 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 244
 245 struct code_hw_watchpoint {
 246         stm32_addr_t addr;
 247         uint8_t mask;
 248         enum watchfun fun;
 249 };
 250
 251 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 252
 253 static void init_data_watchpoints(stlink_t *sl) {
 254         #ifdef DEBUG
 255         printf("init watchpoints\n");
 256         #endif
 257
 258         // set trcena in debug command to turn on dwt unit
 259         stlink_read_mem32(sl, 0xE000EDFC, 4);
 260         sl->q_buf[3] |= 1;
 261         stlink_write_mem32(sl, 0xE000EDFC, 4);
 262
 263         // make sure all watchpoints are cleared
 264         memset(sl->q_buf, 0, 4);
 265         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 266                 data_watches[i].fun = WATCHDISABLED;
 267                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 268         }
 269 }
 270
 271 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 272 {
 273         int i = 0;
 274         uint32_t mask;
 275
 276         // computer mask
 277         // find a free watchpoint
 278         // configure
 279
 280         mask = -1;
 281         i = len;
 282         while(i) {
 283                 i >>= 1;
 284                 mask++;
 285         }
 286
 287         if((mask != -1) && (mask < 16)) {
 288                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 289                         // is this an empty slot ?
 290                         if(data_watches[i].fun == WATCHDISABLED) {
 291                                 #ifdef DEBUG
 292                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 293                                 #endif
 294
 295                                 data_watches[i].fun = wf;
 296                                 data_watches[i].addr = addr;
 297                                 data_watches[i].mask = mask;
 298
 299                                 // insert comparator address
 300                                 sl->q_buf[0] = (addr & 0xff);
 301                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 302                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 303                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 304
 305                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 306
 307                                 // insert mask
 308                                 memset(sl->q_buf, 0, 4);
 309                                 sl->q_buf[0] = mask;
 310                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 311
 312                                 // insert function
 313                                 memset(sl->q_buf, 0, 4);
 314                                 sl->q_buf[0] = wf;
 315                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 316
 317                                 // just to make sure the matched bit is clear !
 318                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 319                                 return 0;
 320                         }
 321                 }
 322         }
 323
 324         #ifdef DEBUG
 325         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 326         #endif
 327         return -1;
 328 }
 329
 330 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 331 {
 332         int i;
 333
 334         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 335                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 336                         #ifdef DEBUG
 337                         printf("delete watchpoint %d addr %x\n", i, addr);
 338                         #endif
 339
 340                         memset(sl->q_buf, 0, 4);
 341                         data_watches[i].fun = WATCHDISABLED;
 342                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 343
 344                         return 0;
 345                 }
 346         }
 347
 348         #ifdef DEBUG
 349         printf("failure: delete watchpoint addr %x\n", addr);
 350         #endif
 351
 352         return -1;
 353 }
 354
 355 #define CODE_BREAK_NUM  6
 356 #define CODE_BREAK_LOW  0x01
 357 #define CODE_BREAK_HIGH 0x02
 358
 359 struct code_hw_breakpoint {
 360         stm32_addr_t addr;
 361         int          type;
 362 };
 363
 364 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 365
 366 static void init_code_breakpoints(stlink_t *sl) {
 367         memset(sl->q_buf, 0, 4);
 368         sl->q_buf[0] = 0x03; // KEY | ENABLE
 369         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 370         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 371         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 372
 373         memset(sl->q_buf, 0, 4);
 374         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 375                 code_breaks[i].type = 0;
 376                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 377         }
 378 }
 379
 380 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 381         stm32_addr_t fpb_addr = addr & ~0x3;
 382         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 383
 384         if(addr & 1) {
 385                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 386                 return -1;
 387         }
 388
 389         int id = -1;
 390         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 391                 if(fpb_addr == code_breaks[i].addr ||
 392                         (set && code_breaks[i].type == 0)) {
 393                         id = i;
 394                         break;
 395                 }
 396         }
 397
 398         if(id == -1) {
 399                 if(set) return -1; // Free slot not found
 400                 else    return 0;  // Breakpoint is already removed
 401         }
 402
 403         struct code_hw_breakpoint* brk = &code_breaks[id];
 404
 405         brk->addr = fpb_addr;
 406
 407         if(set) brk->type |= type;
 408         else    brk->type &= ~type;
 409
 410         memset(sl->q_buf, 0, 4);
 411
 412         if(brk->type == 0) {
 413                 #ifdef DEBUG
 414                 printf("clearing hw break %d\n", id);
 415                 #endif
 416
 417                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 418         } else {
 419                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 420                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 421                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 422                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 423
 424                 #ifdef DEBUG
 425                 printf("setting hw break %d at %08x (%d)\n",
 426                         id, brk->addr, brk->type);
 427                 printf("reg %02x %02x %02x %02x\n",
 428                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 429                 #endif
 430
 431                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 432         }
 433
 434         return 0;
 435 }
 436
 437
 438 struct flash_block {
 439         stm32_addr_t addr;
 440         unsigned     length;
 441         uint8_t*     data;
 442
 443         struct flash_block* next;
 444 };
 445
 446 static struct flash_block* flash_root;
 447
 448 static int flash_add_block(stm32_addr_t addr, unsigned length,
 449                            stlink_t *sl) {
 450         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 451                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 452                 return -1;
 453         }
 454
 455         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 456                 fprintf(stderr, "flash_add_block: unaligned block\n");
 457                 return -1;
 458         }
 459
 460         struct flash_block* new = malloc(sizeof(struct flash_block));
 461         new->next = flash_root;
 462
 463         new->addr   = addr;
 464         new->length = length;
 465         new->data   = calloc(length, 1);
 466
 467         flash_root = new;
 468
 469         return 0;
 470 }
 471
 472 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 473         int fit_blocks = 0, fit_length = 0;
 474
 475         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 476                 /* Block: ------X------Y--------
 477                  * Data:            a-----b
 478                  *                a--b
 479                  *            a-----------b
 480                  * Block intersects with data, if:
 481                  *  a < Y && b > x
 482                  */
 483
 484                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 485                 unsigned a = addr, b = addr + length;
 486                 if(a < Y && b > X) {
 487                         // from start of the block
 488                         unsigned start = (a > X ? a : X) - X;
 489                         unsigned end   = (b > Y ? Y : b) - X;
 490
 491                         memcpy(fb->data + start, data, end - start);
 492
 493                         fit_blocks++;
 494                         fit_length += end - start;
 495                 }
 496         }
 497
 498         if(fit_blocks == 0) {
 499                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 500                 return -1;
 501         }
 502
 503         if(fit_length != length) {
 504                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 505                         addr, length, fit_length);
 506                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int flash_go(stlink_t *sl) {
 513         int error = -1;
 514
 515         // Some kinds of clock settings do not allow writing to flash.
 516         stlink_reset(sl);
 517
 518         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 519                 #ifdef DEBUG
 520                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 521                 #endif
 522
 523                 unsigned length = fb->length;
 524                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 525                         #ifdef DEBUG
 526                         printf("flash_do: page %08x\n", page);
 527                         #endif
 528
 529                         stlink_erase_flash_page(sl, page);
 530
 531                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 532                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 533                                 goto error;
 534                 }
 535
 536         }
 537
 538         stlink_reset(sl);
 539
 540         error = 0;
 541
 542 error:
 543         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 544                 next = fb->next;
 545                 free(fb->data);
 546                 free(fb);
 547         }
 548
 549         flash_root = NULL;
 550
 551         return error;
 552 }
 553
 554 int serve(stlink_t *sl, int port) {
 555         int sock = socket(AF_INET, SOCK_STREAM, 0);
 556         if(sock < 0) {
 557                 perror("socket");
 558                 return 1;
 559         }
 560
 561         unsigned int val = 1;
 562         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 563
 564         struct sockaddr_in serv_addr = {0};
 565         serv_addr.sin_family = AF_INET;
 566         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 567         serv_addr.sin_port = htons(port);
 568
 569         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 570                 perror("bind");
 571                 return 1;
 572         }
 573
 574         if(listen(sock, 5) < 0) {
 575                 perror("listen");
 576                 return 1;
 577         }
 578
 579         stlink_force_debug(sl);
 580         stlink_reset(sl);
 581         init_code_breakpoints(sl);
 582         init_data_watchpoints(sl);
 583
 584         printf("Listening at *:%d...\n", port);
 585
 586         int client = accept(sock, NULL, NULL);
 587         signal (SIGINT, SIG_DFL);
 588         if(client < 0) {
 589                 perror("accept");
 590                 return 1;
 591         }
 592
 593         close(sock);
 594
 595         printf("GDB connected.\n");
 596
 597         /*
 598          * To allow resetting the chip from GDB it is required to
 599          * emulate attaching and detaching to target.
 600          */
 601         unsigned int attached = 1;
 602
 603         while(1) {
 604                 char* packet;
 605
 606                 int status = gdb_recv_packet(client, &packet);
 607                 if(status < 0) {
 608                         fprintf(stderr, "cannot recv: %d\n", status);
 609                         return 1;
 610                 }
 611
 612                 #ifdef DEBUG
 613                 printf("recv: %s\n", packet);
 614                 #endif
 615
 616                 char* reply = NULL;
 617                 reg regp;
 618
 619                 switch(packet[0]) {
 620                 case 'q': {
 621                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 622                                 reply = strdup("");
 623                                 break;
 624                         }
 625
 626                         char *separator = strstr(packet, ":"), *params = "";
 627                         if(separator == NULL) {
 628                                 separator = packet + strlen(packet);
 629                         } else {
 630                                 params = separator + 1;
 631                         }
 632
 633                         unsigned queryNameLength = (separator - &packet[1]);
 634                         char* queryName = calloc(queryNameLength + 1, 1);
 635                         strncpy(queryName, &packet[1], queryNameLength);
 636
 637                         #ifdef DEBUG
 638                         printf("query: %s;%s\n", queryName, params);
 639                         #endif
 640
 641                         if(!strcmp(queryName, "Supported")) {
 642                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 643                         } else if(!strcmp(queryName, "Xfer")) {
 644                                 char *type, *op, *s_addr, *s_length;
 645                                 char *tok = params;
 646                                 char *annex __attribute__((unused));
 647
 648                                 type     = strsep(&tok, ":");
 649                                 op       = strsep(&tok, ":");
 650                                 annex    = strsep(&tok, ":");
 651                                 s_addr   = strsep(&tok, ",");
 652                                 s_length = tok;
 653
 654                                 unsigned addr = strtoul(s_addr, NULL, 16),
 655                                        length = strtoul(s_length, NULL, 16);
 656
 657                                 #ifdef DEBUG
 658                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 659                                         type, op, annex, addr, length);
 660                                 #endif
 661
 662                                 const char* data = NULL;
 663
 664                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 665                                         data = current_memory_map;
 666
 667                                 if(data) {
 668                                         unsigned data_length = strlen(data);
 669                                         if(addr + length > data_length)
 670                                                 length = data_length - addr;
 671
 672                                         if(length == 0) {
 673                                                 reply = strdup("l");
 674                                         } else {
 675                                                 reply = calloc(length + 2, 1);
 676                                                 reply[0] = 'm';
 677                                                 strncpy(&reply[1], data, length);
 678                                         }
 679                                 }
 680                         }
 681
 682                         if(reply == NULL)
 683                                 reply = strdup("");
 684
 685                         free(queryName);
 686
 687                         break;
 688                 }
 689
 690                 case 'v': {
 691                         char *params = NULL;
 692                         char *cmdName = strtok_r(packet, ":;", &params);
 693
 694                         cmdName++; // vCommand -> Command
 695
 696                         if(!strcmp(cmdName, "FlashErase")) {
 697                                 char *s_addr, *s_length;
 698                                 char *tok = params;
 699
 700                                 s_addr   = strsep(&tok, ",");
 701                                 s_length = tok;
 702
 703                                 unsigned addr = strtoul(s_addr, NULL, 16),
 704                                        length = strtoul(s_length, NULL, 16);
 705
 706                                 #ifdef DEBUG
 707                                 printf("FlashErase: addr:%08x,len:%04x\n",
 708                                         addr, length);
 709                                 #endif
 710
 711                                 if(flash_add_block(addr, length, sl) < 0) {
 712                                         reply = strdup("E00");
 713                                 } else {
 714                                         reply = strdup("OK");
 715                                 }
 716                         } else if(!strcmp(cmdName, "FlashWrite")) {
 717                                 char *s_addr, *data;
 718                                 char *tok = params;
 719
 720                                 s_addr = strsep(&tok, ":");
 721                                 data   = tok;
 722
 723                                 unsigned addr = strtoul(s_addr, NULL, 16);
 724                                 unsigned data_length = status - (data - packet);
 725
 726                                 // Length of decoded data cannot be more than
 727                                 // encoded, as escapes are removed.
 728                                 // Additional byte is reserved for alignment fix.
 729                                 uint8_t *decoded = calloc(data_length + 1, 1);
 730                                 unsigned dec_index = 0;
 731                                 for(int i = 0; i < data_length; i++) {
 732                                         if(data[i] == 0x7d) {
 733                                                 i++;
 734                                                 decoded[dec_index++] = data[i] ^ 0x20;
 735                                         } else {
 736                                                 decoded[dec_index++] = data[i];
 737                                         }
 738                                 }
 739
 740                                 // Fix alignment
 741                                 if(dec_index % 2 != 0)
 742                                         dec_index++;
 743
 744                                 #ifdef DEBUG
 745                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 746                                 #endif
 747
 748                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 749                                         reply = strdup("E00");
 750                                 } else {
 751                                         reply = strdup("OK");
 752                                 }
 753                         } else if(!strcmp(cmdName, "FlashDone")) {
 754                                 if(flash_go(sl) < 0) {
 755                                         reply = strdup("E00");
 756                                 } else {
 757                                         reply = strdup("OK");
 758                                 }
 759                         } else if(!strcmp(cmdName, "Kill")) {
 760                                 attached = 0;
 761
 762                                 reply = strdup("OK");
 763                         }
 764
 765                         if(reply == NULL)
 766                                 reply = strdup("");
 767
 768                         break;
 769                 }
 770
 771                 case 'c':
 772                         stlink_run(sl);
 773
 774                         while(1) {
 775                                 int status = gdb_check_for_interrupt(client);
 776                                 if(status < 0) {
 777                                         fprintf(stderr, "cannot check for int: %d\n", status);
 778                                         return 1;
 779                                 }
 780
 781                                 if(status == 1) {
 782                                         stlink_force_debug(sl);
 783                                         break;
 784                                 }
 785
 786                                 stlink_status(sl);
 787                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 788                                         break;
 789                                 }
 790
 791                                 usleep(100000);
 792                         }
 793
 794                         reply = strdup("S05"); // TRAP
 795                         break;
 796
 797                 case 's':
 798                         stlink_step(sl);
 799
 800                         reply = strdup("S05"); // TRAP
 801                         break;
 802
 803                 case '?':
 804                         if(attached) {
 805                                 reply = strdup("S05"); // TRAP
 806                         } else {
 807                                 /* Stub shall reply OK if not attached. */
 808                                 reply = strdup("OK");
 809                         }
 810                         break;
 811
 812                 case 'g':
 813                         stlink_read_all_regs(sl, &regp);
 814
 815                         reply = calloc(8 * 16 + 1, 1);
 816                         for(int i = 0; i < 16; i++)
 817                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 818
 819                         break;
 820
 821                 case 'p': {
 822                         unsigned id = strtoul(&packet[1], NULL, 16);
 823                         unsigned myreg = 0xDEADDEAD;
 824
 825                         if(id < 16) {
 826                                 stlink_read_reg(sl, id, &regp);
 827                                 myreg = htonl(regp.r[id]);
 828                         } else if(id == 0x19) {
 829                                 stlink_read_reg(sl, 16, &regp);
 830                                 myreg = htonl(regp.xpsr);
 831                         } else {
 832                                 reply = strdup("E00");
 833                         }
 834
 835                         reply = calloc(8 + 1, 1);
 836                         sprintf(reply, "%08x", myreg);
 837
 838                         break;
 839                 }
 840
 841                 case 'P': {
 842                         char* s_reg = &packet[1];
 843                         char* s_value = strstr(&packet[1], "=") + 1;
 844
 845                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 846                         unsigned value = strtoul(s_value, NULL, 16);
 847
 848                         if(reg < 16) {
 849                                 stlink_write_reg(sl, ntohl(value), reg);
 850                         } else if(reg == 0x19) {
 851                                 stlink_write_reg(sl, ntohl(value), 16);
 852                         } else {
 853                                 reply = strdup("E00");
 854                         }
 855
 856                         if(!reply) {
 857                                 reply = strdup("OK");
 858                         }
 859
 860                         break;
 861                 }
 862
 863                 case 'G':
 864                         for(int i = 0; i < 16; i++) {
 865                                 char str[9] = {0};
 866                                 strncpy(str, &packet[1 + i * 8], 8);
 867                                 uint32_t reg = strtoul(str, NULL, 16);
 868                                 stlink_write_reg(sl, ntohl(reg), i);
 869                         }
 870
 871                         reply = strdup("OK");
 872                         break;
 873
 874                 case 'm': {
 875                         char* s_start = &packet[1];
 876                         char* s_count = strstr(&packet[1], ",") + 1;
 877
 878                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 879                         unsigned     count = strtoul(s_count, NULL, 16);
 880
 881                         unsigned adj_start = start % 4;
 882
 883                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 884                                                 count : count + 4 - (count % 4));
 885
 886                         reply = calloc(count * 2 + 1, 1);
 887                         for(int i = 0; i < count; i++) {
 888                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 889                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 890                         }
 891
 892                         break;
 893                 }
 894
 895                 case 'M': {
 896                         char* s_start = &packet[1];
 897                         char* s_count = strstr(&packet[1], ",") + 1;
 898                         char* hexdata = strstr(packet, ":") + 1;
 899
 900                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 901                         unsigned     count = strtoul(s_count, NULL, 16);
 902
 903                         for(int i = 0; i < count; i ++) {
 904                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 905                                 uint8_t byte = strtoul(hex, NULL, 16);
 906                                 sl->q_buf[i] = byte;
 907                         }
 908
 909                         if((count % 4) == 0 && (start % 4) == 0) {
 910                                 stlink_write_mem32(sl, start, count);
 911                         } else {
 912                                 stlink_write_mem8(sl, start, count);
 913                         }
 914
 915                         reply = strdup("OK");
 916
 917                         break;
 918                 }
 919
 920                 case 'Z': {
 921                         char *endptr;
 922                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 923                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 924
 925                         switch (packet[1]) {
 926                                 case '1':
 927                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 928                                         reply = strdup("E00");
 929                                 } else {
 930                                         reply = strdup("OK");
 931                                 }
 932                                 break;
 933
 934                                 case '2':   // insert write watchpoint
 935                                 case '3':   // insert read  watchpoint
 936                                 case '4':   // insert access watchpoint
 937                                 {
 938                                         enum watchfun wf;
 939                                         if(packet[1] == '2') {
 940                                                 wf = WATCHWRITE;
 941                                         } else if(packet[1] == '3') {
 942                                                 wf = WATCHREAD;
 943                                         } else {
 944                                                 wf = WATCHACCESS;
 945                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 946                                                         reply = strdup("E00");
 947                                                 } else {
 948                                                         reply = strdup("OK");
 949                                                         break;
 950                                                 }
 951                                         }
 952                                 }
 953
 954                                 default:
 955                                 reply = strdup("");
 956                         }
 957                         break;
 958                 }
 959                 case 'z': {
 960                         char *endptr;
 961                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 962                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 963
 964                         switch (packet[1]) {
 965                                 case '1': // remove breakpoint
 966                                 update_code_breakpoint(sl, addr, 0);
 967                                 reply = strdup("OK");
 968                                 break;
 969
 970                                 case '2' : // remove write watchpoint
 971                                 case '3' : // remove read watchpoint
 972                                 case '4' : // remove access watchpoint
 973                                 if(delete_data_watchpoint(sl, addr) < 0) {
 974                                         reply = strdup("E00");
 975                                 } else {
 976                                         reply = strdup("OK");
 977                                         break;
 978                                 }
 979
 980                                 default:
 981                                 reply = strdup("");
 982                         }
 983                         break;
 984                 }
 985
 986                 case '!': {
 987                         /*
 988                          * Enter extended mode which allows restarting.
 989                          * We do support that always.
 990                          */
 991
 992                         reply = strdup("OK");
 993
 994                         break;
 995                 }
 996
 997                 case 'R': {
 998                         /* Reset the core. */
 999
1000                         stlink_reset(sl);
1001                         init_code_breakpoints(sl);
1002                         init_data_watchpoints(sl);
1003
1004                         attached = 1;
1005
1006                         reply = strdup("OK");
1007
1008                         break;
1009                 }
1010
1011                 default:
1012                         reply = strdup("");
1013                 }
1014
1015                 if(reply) {
1016                         #ifdef DEBUG
1017                         printf("send: %s\n", reply);
1018                         #endif
1019
1020                         int result = gdb_send_packet(client, reply);
1021                         if(result != 0) {
1022                                 fprintf(stderr, "cannot send: %d\n", result);
1023                                 return 1;
1024                         }
1025
1026                         free(reply);
1027                 }
1028
1029                 free(packet);
1030         }
1031
1032         return 0;
1033 }