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

   1 /* -*- tab-width:8 -*- */
   2 #define DEBUG 0
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <signal.h>
  19
  20 #include <stlink-common.h>
  21
  22 #include "gdb-remote.h"
  23
  24 #define DEFAULT_LOGGING_LEVEL 50
  25 #define DEFAULT_GDB_LISTEN_PORT 4242
  26
  27 #define STRINGIFY_inner(name) #name
  28 #define STRINGIFY(name) STRINGIFY_inner(name)
  29
  30 #define FLASH_BASE 0x08000000
  31
  32 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  33 #define FLASH_PAGE (sl->flash_pgsz)
  34
  35 static const char hex[] = "0123456789abcdef";
  36
  37 static const char* current_memory_map = NULL;
  38
  39 typedef struct _st_state_t {
  40     // things from command line, bleh
  41     int stlink_version;
  42     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  43     char devicename[100];
  44     int logging_level;
  45         int listen_port;
  46 } st_state_t;
  47
  48
  49 int serve(stlink_t *sl, int port);
  50 char* make_memory_map(stlink_t *sl);
  51
  52
  53 int parse_options(int argc, char** argv, st_state_t *st) {
  54     static struct option long_options[] = {
  55         {"help", no_argument, NULL, 'h'},
  56         {"verbose", optional_argument, NULL, 'v'},
  57         {"device", required_argument, NULL, 'd'},
  58         {"stlink_version", required_argument, NULL, 's'},
  59         {"stlinkv1", no_argument, NULL, '1'},
  60                 {"listen_port", required_argument, NULL, 'p'},
  61         {0, 0, 0, 0},
  62     };
  63         const char * help_str = "%s - usage:\n\n"
  64         "  -h, --help\t\tPrint this help\n"
  65         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  66         "  -v, --verbose\tspecify generally verbose logging\n"
  67         "  -d <device>, --device=/dev/stlink2_1\n"
  68         "\t\t\tWhere is your stlink device connected?\n"
  69         "  -s X, --stlink_version=X\n"
  70         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  71         "  -1, --stlinkv1\tForce stlink version 1\n"
  72         "  -p 4242, --listen_port=1234\n"
  73         "\t\t\tSet the gdb server listen port. "
  74         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  75         ;
  76
  77
  78     int option_index = 0;
  79     int c;
  80     int q;
  81     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  82         switch (c) {
  83         case 0:
  84             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  85             printf("option %s", long_options[option_index].name);
  86             if (optarg) {
  87                 printf(" with arg %s", optarg);
  88             }
  89             printf("\n");
  90             break;
  91         case 'h':
  92             printf(help_str, argv[0]);
  93             exit(EXIT_SUCCESS);
  94             break;
  95         case 'v':
  96             if (optarg) {
  97                 st->logging_level = atoi(optarg);
  98             } else {
  99                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 100             }
 101             break;
 102         case 'd':
 103             if (strlen(optarg) > sizeof (st->devicename)) {
 104                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 105             } else {
 106                 strcpy(st->devicename, optarg);
 107             }
 108             break;
 109                 case '1':
 110                         st->stlink_version = 1;
 111                         break;
 112                 case 's':
 113                         sscanf(optarg, "%i", &q);
 114                         if (q < 0 || q > 2) {
 115                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 116                                 exit(EXIT_FAILURE);
 117                         }
 118                         st->stlink_version = q;
 119                         break;
 120                 case 'p':
 121                         sscanf(optarg, "%i", &q);
 122                         if (q < 0) {
 123                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 124                                 exit(EXIT_FAILURE);
 125                         }
 126                         st->listen_port = q;
 127                         break;
 128         }
 129     }
 130
 131     if (optind < argc) {
 132         printf("non-option ARGV-elements: ");
 133         while (optind < argc)
 134             printf("%s ", argv[optind++]);
 135         printf("\n");
 136     }
 137     return 0;
 138 }
 139
 140
 141 int main(int argc, char** argv) {
 142
 143         stlink_t *sl = NULL;
 144
 145         st_state_t state;
 146         memset(&state, 0, sizeof(state));
 147         // set defaults...
 148         state.stlink_version = 2;
 149         state.logging_level = DEFAULT_LOGGING_LEVEL;
 150         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 151         parse_options(argc, argv, &state);
 152         switch (state.stlink_version) {
 153         case 2:
 154                 sl = stlink_open_usb(state.logging_level);
 155                 if(sl == NULL) return 1;
 156                 break;
 157         case 1:
 158                 sl = stlink_v1_open(state.logging_level);
 159                 if(sl == NULL) return 1;
 160                 break;
 161     }
 162
 163         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 164
 165         sl->verbose=0;
 166
 167         current_memory_map = make_memory_map(sl);
 168
 169         while(serve(sl, state.listen_port) == 0);
 170
 171         /* Switch back to mass storage mode before closing. */
 172         stlink_run(sl);
 173         stlink_exit_debug_mode(sl);
 174         stlink_close(sl);
 175
 176         return 0;
 177 }
 178
 179 static const char* const memory_map_template_F4 =
 180   "<?xml version=\"1.0\"?>"
 181   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 182   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 183   "<memory-map>"
 184   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 185   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"        // sram
 186   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 187   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 188   "  </memory>"
 189   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 190   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 191   "  </memory>"
 192   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 193   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 194   "  </memory>"
 195   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 196   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 197   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 198   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 199   "</memory-map>";
 200
 201 static const char* const memory_map_template =
 202   "<?xml version=\"1.0\"?>"
 203   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 204   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 205   "<memory-map>"
 206   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 207   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 208   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 209   "    <property name=\"blocksize\">0x%x</property>"
 210   "  </memory>"
 211   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 212   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 213   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 214   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 215   "</memory-map>";
 216
 217 char* make_memory_map(stlink_t *sl) {
 218         /* This will be freed in serve() */
 219         char* map = malloc(4096);
 220         map[0] = '\0';
 221
 222         if(sl->chip_id==STM32F4_CHIP_ID) {
 223         strcpy(map, memory_map_template_F4);
 224     } else {
 225         snprintf(map, 4096, memory_map_template,
 226                         sl->flash_size,
 227                         sl->sram_size,
 228                         sl->flash_size, sl->flash_pgsz,
 229                         sl->sys_base, sl->sys_size);
 230     }
 231         return map;
 232 }
 233
 234
 235 /*
 236  * DWT_COMP0     0xE0001020
 237  * DWT_MASK0     0xE0001024
 238  * DWT_FUNCTION0 0xE0001028
 239  * DWT_COMP1     0xE0001030
 240  * DWT_MASK1     0xE0001034
 241  * DWT_FUNCTION1 0xE0001038
 242  * DWT_COMP2     0xE0001040
 243  * DWT_MASK2     0xE0001044
 244  * DWT_FUNCTION2 0xE0001048
 245  * DWT_COMP3     0xE0001050
 246  * DWT_MASK3     0xE0001054
 247  * DWT_FUNCTION3 0xE0001058
 248  */
 249
 250 #define DATA_WATCH_NUM 4
 251
 252 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 253
 254 struct code_hw_watchpoint {
 255         stm32_addr_t addr;
 256         uint8_t mask;
 257         enum watchfun fun;
 258 };
 259
 260 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 261
 262 static void init_data_watchpoints(stlink_t *sl) {
 263         #ifdef DEBUG
 264         printf("init watchpoints\n");
 265         #endif
 266
 267         // set trcena in debug command to turn on dwt unit
 268         stlink_read_mem32(sl, 0xE000EDFC, 4);
 269         sl->q_buf[3] |= 1;
 270         stlink_write_mem32(sl, 0xE000EDFC, 4);
 271
 272         // make sure all watchpoints are cleared
 273         memset(sl->q_buf, 0, 4);
 274         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 275                 data_watches[i].fun = WATCHDISABLED;
 276                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 277         }
 278 }
 279
 280 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 281 {
 282         int i = 0;
 283         uint32_t mask;
 284
 285         // computer mask
 286         // find a free watchpoint
 287         // configure
 288
 289         mask = -1;
 290         i = len;
 291         while(i) {
 292                 i >>= 1;
 293                 mask++;
 294         }
 295
 296         if((mask != -1) && (mask < 16)) {
 297                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 298                         // is this an empty slot ?
 299                         if(data_watches[i].fun == WATCHDISABLED) {
 300                                 #ifdef DEBUG
 301                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 302                                 #endif
 303
 304                                 data_watches[i].fun = wf;
 305                                 data_watches[i].addr = addr;
 306                                 data_watches[i].mask = mask;
 307
 308                                 // insert comparator address
 309                                 sl->q_buf[0] = (addr & 0xff);
 310                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 311                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 312                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 313
 314                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 315
 316                                 // insert mask
 317                                 memset(sl->q_buf, 0, 4);
 318                                 sl->q_buf[0] = mask;
 319                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 320
 321                                 // insert function
 322                                 memset(sl->q_buf, 0, 4);
 323                                 sl->q_buf[0] = wf;
 324                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 325
 326                                 // just to make sure the matched bit is clear !
 327                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 328                                 return 0;
 329                         }
 330                 }
 331         }
 332
 333         #ifdef DEBUG
 334         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 335         #endif
 336         return -1;
 337 }
 338
 339 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 340 {
 341         int i;
 342
 343         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 344                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 345                         #ifdef DEBUG
 346                         printf("delete watchpoint %d addr %x\n", i, addr);
 347                         #endif
 348
 349                         memset(sl->q_buf, 0, 4);
 350                         data_watches[i].fun = WATCHDISABLED;
 351                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 352
 353                         return 0;
 354                 }
 355         }
 356
 357         #ifdef DEBUG
 358         printf("failure: delete watchpoint addr %x\n", addr);
 359         #endif
 360
 361         return -1;
 362 }
 363
 364 #define CODE_BREAK_NUM  6
 365 #define CODE_BREAK_LOW  0x01
 366 #define CODE_BREAK_HIGH 0x02
 367
 368 struct code_hw_breakpoint {
 369         stm32_addr_t addr;
 370         int          type;
 371 };
 372
 373 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 374
 375 static void init_code_breakpoints(stlink_t *sl) {
 376         memset(sl->q_buf, 0, 4);
 377         sl->q_buf[0] = 0x03; // KEY | ENABLE
 378         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 379         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 380         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 381
 382         memset(sl->q_buf, 0, 4);
 383         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 384                 code_breaks[i].type = 0;
 385                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 386         }
 387 }
 388
 389 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 390         stm32_addr_t fpb_addr = addr & ~0x3;
 391         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 392
 393         if(addr & 1) {
 394                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 395                 return -1;
 396         }
 397
 398         int id = -1;
 399         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 400                 if(fpb_addr == code_breaks[i].addr ||
 401                         (set && code_breaks[i].type == 0)) {
 402                         id = i;
 403                         break;
 404                 }
 405         }
 406
 407         if(id == -1) {
 408                 if(set) return -1; // Free slot not found
 409                 else    return 0;  // Breakpoint is already removed
 410         }
 411
 412         struct code_hw_breakpoint* brk = &code_breaks[id];
 413
 414         brk->addr = fpb_addr;
 415
 416         if(set) brk->type |= type;
 417         else    brk->type &= ~type;
 418
 419         memset(sl->q_buf, 0, 4);
 420
 421         if(brk->type == 0) {
 422                 #ifdef DEBUG
 423                 printf("clearing hw break %d\n", id);
 424                 #endif
 425
 426                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 427         } else {
 428                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 429                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 430                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 431                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 432
 433                 #ifdef DEBUG
 434                 printf("setting hw break %d at %08x (%d)\n",
 435                         id, brk->addr, brk->type);
 436                 printf("reg %02x %02x %02x %02x\n",
 437                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 438                 #endif
 439
 440                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 441         }
 442
 443         return 0;
 444 }
 445
 446
 447 struct flash_block {
 448         stm32_addr_t addr;
 449         unsigned     length;
 450         uint8_t*     data;
 451
 452         struct flash_block* next;
 453 };
 454
 455 static struct flash_block* flash_root;
 456
 457 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 458
 459         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 460                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 461                 return -1;
 462         }
 463
 464         stlink_calculate_pagesize(sl, addr);
 465         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 466                 fprintf(stderr, "flash_add_block: unaligned block\n");
 467                 return -1;
 468         }
 469
 470         struct flash_block* new = malloc(sizeof(struct flash_block));
 471         new->next = flash_root;
 472
 473         new->addr   = addr;
 474         new->length = length;
 475         new->data   = calloc(length, 1);
 476
 477         flash_root = new;
 478
 479         return 0;
 480 }
 481
 482 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 483         int fit_blocks = 0, fit_length = 0;
 484
 485         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 486                 /* Block: ------X------Y--------
 487                  * Data:            a-----b
 488                  *                a--b
 489                  *            a-----------b
 490                  * Block intersects with data, if:
 491                  *  a < Y && b > x
 492                  */
 493
 494                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 495                 unsigned a = addr, b = addr + length;
 496                 if(a < Y && b > X) {
 497                         // from start of the block
 498                         unsigned start = (a > X ? a : X) - X;
 499                         unsigned end   = (b > Y ? Y : b) - X;
 500
 501                         memcpy(fb->data + start, data, end - start);
 502
 503                         fit_blocks++;
 504                         fit_length += end - start;
 505                 }
 506         }
 507
 508         if(fit_blocks == 0) {
 509                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 510                 return -1;
 511         }
 512
 513         if(fit_length != length) {
 514                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 515                         addr, length, fit_length);
 516                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 517         }
 518
 519         return 0;
 520 }
 521
 522 static int flash_go(stlink_t *sl) {
 523         int error = -1;
 524
 525         // Some kinds of clock settings do not allow writing to flash.
 526         stlink_reset(sl);
 527
 528         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 529                 #ifdef DEBUG
 530                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 531                 #endif
 532
 533                 unsigned length = fb->length;
 534                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 535
 536                         //Update FLASH_PAGE
 537                         stlink_calculate_pagesize(sl, page);
 538
 539                         #ifdef DEBUG
 540                         printf("flash_do: page %08x\n", page);
 541                         #endif
 542
 543                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 544                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 545                                 goto error;
 546                         }
 547         }
 548
 549         stlink_reset(sl);
 550
 551         error = 0;
 552
 553 error:
 554         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 555                 next = fb->next;
 556                 free(fb->data);
 557                 free(fb);
 558         }
 559
 560         flash_root = NULL;
 561
 562         return error;
 563 }
 564
 565 int serve(stlink_t *sl, int port) {
 566         int sock = socket(AF_INET, SOCK_STREAM, 0);
 567         if(sock < 0) {
 568                 perror("socket");
 569                 return 1;
 570         }
 571
 572         unsigned int val = 1;
 573         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 574
 575         struct sockaddr_in serv_addr = {0};
 576         serv_addr.sin_family = AF_INET;
 577         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 578         serv_addr.sin_port = htons(port);
 579
 580         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 581                 perror("bind");
 582                 return 1;
 583         }
 584
 585         if(listen(sock, 5) < 0) {
 586                 perror("listen");
 587                 return 1;
 588         }
 589
 590         stlink_force_debug(sl);
 591         stlink_reset(sl);
 592         init_code_breakpoints(sl);
 593         init_data_watchpoints(sl);
 594
 595         printf("Listening at *:%d...\n", port);
 596
 597         int client = accept(sock, NULL, NULL);
 598         signal (SIGINT, SIG_DFL);
 599         if(client < 0) {
 600                 perror("accept");
 601                 return 1;
 602         }
 603
 604         close(sock);
 605
 606         printf("GDB connected.\n");
 607
 608         /*
 609          * To allow resetting the chip from GDB it is required to
 610          * emulate attaching and detaching to target.
 611          */
 612         unsigned int attached = 1;
 613
 614         while(1) {
 615                 char* packet;
 616
 617                 int status = gdb_recv_packet(client, &packet);
 618                 if(status < 0) {
 619                         fprintf(stderr, "cannot recv: %d\n", status);
 620                         return 1;
 621                 }
 622
 623                 #ifdef DEBUG
 624                 printf("recv: %s\n", packet);
 625                 #endif
 626
 627                 char* reply = NULL;
 628                 reg regp;
 629
 630                 switch(packet[0]) {
 631                 case 'q': {
 632                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 633                                 reply = strdup("");
 634                                 break;
 635                         }
 636
 637                         char *separator = strstr(packet, ":"), *params = "";
 638                         if(separator == NULL) {
 639                                 separator = packet + strlen(packet);
 640                         } else {
 641                                 params = separator + 1;
 642                         }
 643
 644                         unsigned queryNameLength = (separator - &packet[1]);
 645                         char* queryName = calloc(queryNameLength + 1, 1);
 646                         strncpy(queryName, &packet[1], queryNameLength);
 647
 648                         #ifdef DEBUG
 649                         printf("query: %s;%s\n", queryName, params);
 650                         #endif
 651
 652                         if(!strcmp(queryName, "Supported")) {
 653                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 654                         } else if(!strcmp(queryName, "Xfer")) {
 655                                 char *type, *op, *s_addr, *s_length;
 656                                 char *tok = params;
 657                                 char *annex __attribute__((unused));
 658
 659                                 type     = strsep(&tok, ":");
 660                                 op       = strsep(&tok, ":");
 661                                 annex    = strsep(&tok, ":");
 662                                 s_addr   = strsep(&tok, ",");
 663                                 s_length = tok;
 664
 665                                 unsigned addr = strtoul(s_addr, NULL, 16),
 666                                        length = strtoul(s_length, NULL, 16);
 667
 668                                 #ifdef DEBUG
 669                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 670                                         type, op, annex, addr, length);
 671                                 #endif
 672
 673                                 const char* data = NULL;
 674
 675                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 676                                         data = current_memory_map;
 677
 678                                 if(data) {
 679                                         unsigned data_length = strlen(data);
 680                                         if(addr + length > data_length)
 681                                                 length = data_length - addr;
 682
 683                                         if(length == 0) {
 684                                                 reply = strdup("l");
 685                                         } else {
 686                                                 reply = calloc(length + 2, 1);
 687                                                 reply[0] = 'm';
 688                                                 strncpy(&reply[1], data, length);
 689                                         }
 690                                 }
 691                         }
 692
 693                         if(reply == NULL)
 694                                 reply = strdup("");
 695
 696                         free(queryName);
 697
 698                         break;
 699                 }
 700
 701                 case 'v': {
 702                         char *params = NULL;
 703                         char *cmdName = strtok_r(packet, ":;", &params);
 704
 705                         cmdName++; // vCommand -> Command
 706
 707                         if(!strcmp(cmdName, "FlashErase")) {
 708                                 char *s_addr, *s_length;
 709                                 char *tok = params;
 710
 711                                 s_addr   = strsep(&tok, ",");
 712                                 s_length = tok;
 713
 714                                 unsigned addr = strtoul(s_addr, NULL, 16),
 715                                        length = strtoul(s_length, NULL, 16);
 716
 717                                 #ifdef DEBUG
 718                                 printf("FlashErase: addr:%08x,len:%04x\n",
 719                                         addr, length);
 720                                 #endif
 721
 722                                 if(flash_add_block(addr, length, sl) < 0) {
 723                                         reply = strdup("E00");
 724                                 } else {
 725                                         reply = strdup("OK");
 726                                 }
 727                         } else if(!strcmp(cmdName, "FlashWrite")) {
 728                                 char *s_addr, *data;
 729                                 char *tok = params;
 730
 731                                 s_addr = strsep(&tok, ":");
 732                                 data   = tok;
 733
 734                                 unsigned addr = strtoul(s_addr, NULL, 16);
 735                                 unsigned data_length = status - (data - packet);
 736
 737                                 // Length of decoded data cannot be more than
 738                                 // encoded, as escapes are removed.
 739                                 // Additional byte is reserved for alignment fix.
 740                                 uint8_t *decoded = calloc(data_length + 1, 1);
 741                                 unsigned dec_index = 0;
 742                                 for(int i = 0; i < data_length; i++) {
 743                                         if(data[i] == 0x7d) {
 744                                                 i++;
 745                                                 decoded[dec_index++] = data[i] ^ 0x20;
 746                                         } else {
 747                                                 decoded[dec_index++] = data[i];
 748                                         }
 749                                 }
 750
 751                                 // Fix alignment
 752                                 if(dec_index % 2 != 0)
 753                                         dec_index++;
 754
 755                                 #ifdef DEBUG
 756                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 757                                 #endif
 758
 759                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 760                                         reply = strdup("E00");
 761                                 } else {
 762                                         reply = strdup("OK");
 763                                 }
 764                         } else if(!strcmp(cmdName, "FlashDone")) {
 765                                 if(flash_go(sl) < 0) {
 766                                         reply = strdup("E00");
 767                                 } else {
 768                                         reply = strdup("OK");
 769                                 }
 770                         } else if(!strcmp(cmdName, "Kill")) {
 771                                 attached = 0;
 772
 773                                 reply = strdup("OK");
 774                         }
 775
 776                         if(reply == NULL)
 777                                 reply = strdup("");
 778
 779                         break;
 780                 }
 781
 782                 case 'c':
 783                         stlink_run(sl);
 784
 785                         while(1) {
 786                                 int status = gdb_check_for_interrupt(client);
 787                                 if(status < 0) {
 788                                         fprintf(stderr, "cannot check for int: %d\n", status);
 789                                         return 1;
 790                                 }
 791
 792                                 if(status == 1) {
 793                                         stlink_force_debug(sl);
 794                                         break;
 795                                 }
 796
 797                                 stlink_status(sl);
 798                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 799                                         break;
 800                                 }
 801
 802                                 usleep(100000);
 803                         }
 804
 805                         reply = strdup("S05"); // TRAP
 806                         break;
 807
 808                 case 's':
 809                         stlink_step(sl);
 810
 811                         reply = strdup("S05"); // TRAP
 812                         break;
 813
 814                 case '?':
 815                         if(attached) {
 816                                 reply = strdup("S05"); // TRAP
 817                         } else {
 818                                 /* Stub shall reply OK if not attached. */
 819                                 reply = strdup("OK");
 820                         }
 821                         break;
 822
 823                 case 'g':
 824                         stlink_read_all_regs(sl, &regp);
 825
 826                         reply = calloc(8 * 16 + 1, 1);
 827                         for(int i = 0; i < 16; i++)
 828                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 829
 830                         break;
 831
 832                 case 'p': {
 833                         unsigned id = strtoul(&packet[1], NULL, 16);
 834                         unsigned myreg = 0xDEADDEAD;
 835
 836                         if(id < 16) {
 837                                 stlink_read_reg(sl, id, &regp);
 838                                 myreg = htonl(regp.r[id]);
 839                         } else if(id == 0x19) {
 840                                 stlink_read_reg(sl, 16, &regp);
 841                                 myreg = htonl(regp.xpsr);
 842                         } else {
 843                                 reply = strdup("E00");
 844                         }
 845
 846                         reply = calloc(8 + 1, 1);
 847                         sprintf(reply, "%08x", myreg);
 848
 849                         break;
 850                 }
 851
 852                 case 'P': {
 853                         char* s_reg = &packet[1];
 854                         char* s_value = strstr(&packet[1], "=") + 1;
 855
 856                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 857                         unsigned value = strtoul(s_value, NULL, 16);
 858
 859                         if(reg < 16) {
 860                                 stlink_write_reg(sl, ntohl(value), reg);
 861                         } else if(reg == 0x19) {
 862                                 stlink_write_reg(sl, ntohl(value), 16);
 863                         } else {
 864                                 reply = strdup("E00");
 865                         }
 866
 867                         if(!reply) {
 868                                 reply = strdup("OK");
 869                         }
 870
 871                         break;
 872                 }
 873
 874                 case 'G':
 875                         for(int i = 0; i < 16; i++) {
 876                                 char str[9] = {0};
 877                                 strncpy(str, &packet[1 + i * 8], 8);
 878                                 uint32_t reg = strtoul(str, NULL, 16);
 879                                 stlink_write_reg(sl, ntohl(reg), i);
 880                         }
 881
 882                         reply = strdup("OK");
 883                         break;
 884
 885                 case 'm': {
 886                         char* s_start = &packet[1];
 887                         char* s_count = strstr(&packet[1], ",") + 1;
 888
 889                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 890                         unsigned     count = strtoul(s_count, NULL, 16);
 891
 892                         unsigned adj_start = start % 4;
 893
 894                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 895                                                 count : count + 4 - (count % 4));
 896
 897                         reply = calloc(count * 2 + 1, 1);
 898                         for(int i = 0; i < count; i++) {
 899                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 900                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 901                         }
 902
 903                         break;
 904                 }
 905
 906                 case 'M': {
 907                         char* s_start = &packet[1];
 908                         char* s_count = strstr(&packet[1], ",") + 1;
 909                         char* hexdata = strstr(packet, ":") + 1;
 910
 911                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 912                         unsigned     count = strtoul(s_count, NULL, 16);
 913
 914                         for(int i = 0; i < count; i ++) {
 915                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 916                                 uint8_t byte = strtoul(hex, NULL, 16);
 917                                 sl->q_buf[i] = byte;
 918                         }
 919
 920                         if((count % 4) == 0 && (start % 4) == 0) {
 921                                 stlink_write_mem32(sl, start, count);
 922                         } else {
 923                                 stlink_write_mem8(sl, start, count);
 924                         }
 925
 926                         reply = strdup("OK");
 927
 928                         break;
 929                 }
 930
 931                 case 'Z': {
 932                         char *endptr;
 933                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 934                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 935
 936                         switch (packet[1]) {
 937                                 case '1':
 938                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 939                                         reply = strdup("E00");
 940                                 } else {
 941                                         reply = strdup("OK");
 942                                 }
 943                                 break;
 944
 945                                 case '2':   // insert write watchpoint
 946                                 case '3':   // insert read  watchpoint
 947                                 case '4':   // insert access watchpoint
 948                                 {
 949                                         enum watchfun wf;
 950                                         if(packet[1] == '2') {
 951                                                 wf = WATCHWRITE;
 952                                         } else if(packet[1] == '3') {
 953                                                 wf = WATCHREAD;
 954                                         } else {
 955                                                 wf = WATCHACCESS;
 956                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 957                                                         reply = strdup("E00");
 958                                                 } else {
 959                                                         reply = strdup("OK");
 960                                                         break;
 961                                                 }
 962                                         }
 963                                 }
 964
 965                                 default:
 966                                 reply = strdup("");
 967                         }
 968                         break;
 969                 }
 970                 case 'z': {
 971                         char *endptr;
 972                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 973                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 974
 975                         switch (packet[1]) {
 976                                 case '1': // remove breakpoint
 977                                 update_code_breakpoint(sl, addr, 0);
 978                                 reply = strdup("OK");
 979                                 break;
 980
 981                                 case '2' : // remove write watchpoint
 982                                 case '3' : // remove read watchpoint
 983                                 case '4' : // remove access watchpoint
 984                                 if(delete_data_watchpoint(sl, addr) < 0) {
 985                                         reply = strdup("E00");
 986                                 } else {
 987                                         reply = strdup("OK");
 988                                         break;
 989                                 }
 990
 991                                 default:
 992                                 reply = strdup("");
 993                         }
 994                         break;
 995                 }
 996
 997                 case '!': {
 998                         /*
 999                          * Enter extended mode which allows restarting.
1000                          * We do support that always.
1001                          */
1002
1003                         reply = strdup("OK");
1004
1005                         break;
1006                 }
1007
1008                 case 'R': {
1009                         /* Reset the core. */
1010
1011                         stlink_reset(sl);
1012                         init_code_breakpoints(sl);
1013                         init_data_watchpoints(sl);
1014
1015                         attached = 1;
1016
1017                         reply = strdup("OK");
1018
1019                         break;
1020                 }
1021
1022                 default:
1023                         reply = strdup("");
1024                 }
1025
1026                 if(reply) {
1027                         #ifdef DEBUG
1028                         printf("send: %s\n", reply);
1029                         #endif
1030
1031                         int result = gdb_send_packet(client, reply);
1032                         if(result != 0) {
1033                                 fprintf(stderr, "cannot send: %d\n", result);
1034                                 return 1;
1035                         }
1036
1037                         free(reply);
1038                 }
1039
1040                 free(packet);
1041         }
1042
1043         return 0;
1044 }