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         stlink_reset(sl);
 164         stlink_load_device_params(sl);
 165         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 166
 167         sl->verbose=0;
 168
 169         current_memory_map = make_memory_map(sl);
 170
 171         while(serve(sl, state.listen_port) == 0);
 172
 173         /* Switch back to mass storage mode before closing. */
 174         stlink_run(sl);
 175         stlink_exit_debug_mode(sl);
 176         stlink_close(sl);
 177
 178         return 0;
 179 }
 180
 181 static const char* const memory_map_template_F4 =
 182   "<?xml version=\"1.0\"?>"
 183   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 184   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 185   "<memory-map>"
 186   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 187   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"        // sram
 188   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 189   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 190   "  </memory>"
 191   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 192   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 193   "  </memory>"
 194   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 195   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 196   "  </memory>"
 197   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 198   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 199   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 200   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 201   "</memory-map>";
 202
 203 static const char* const memory_map_template =
 204   "<?xml version=\"1.0\"?>"
 205   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 206   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 207   "<memory-map>"
 208   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 209   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 210   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 211   "    <property name=\"blocksize\">0x%x</property>"
 212   "  </memory>"
 213   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 214   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 215   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 216   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 217   "</memory-map>";
 218
 219 char* make_memory_map(stlink_t *sl) {
 220         /* This will be freed in serve() */
 221         char* map = malloc(4096);
 222         map[0] = '\0';
 223
 224         if(sl->chip_id==STM32F4_CHIP_ID) {
 225         strcpy(map, memory_map_template_F4);
 226     } else {
 227         snprintf(map, 4096, memory_map_template,
 228                         sl->flash_size,
 229                         sl->sram_size,
 230                         sl->flash_size, sl->flash_pgsz,
 231                         sl->sys_base, sl->sys_size);
 232     }
 233         return map;
 234 }
 235
 236
 237 /*
 238  * DWT_COMP0     0xE0001020
 239  * DWT_MASK0     0xE0001024
 240  * DWT_FUNCTION0 0xE0001028
 241  * DWT_COMP1     0xE0001030
 242  * DWT_MASK1     0xE0001034
 243  * DWT_FUNCTION1 0xE0001038
 244  * DWT_COMP2     0xE0001040
 245  * DWT_MASK2     0xE0001044
 246  * DWT_FUNCTION2 0xE0001048
 247  * DWT_COMP3     0xE0001050
 248  * DWT_MASK3     0xE0001054
 249  * DWT_FUNCTION3 0xE0001058
 250  */
 251
 252 #define DATA_WATCH_NUM 4
 253
 254 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 255
 256 struct code_hw_watchpoint {
 257         stm32_addr_t addr;
 258         uint8_t mask;
 259         enum watchfun fun;
 260 };
 261
 262 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 263
 264 static void init_data_watchpoints(stlink_t *sl) {
 265         #ifdef DEBUG
 266         printf("init watchpoints\n");
 267         #endif
 268
 269         // set trcena in debug command to turn on dwt unit
 270         stlink_read_mem32(sl, 0xE000EDFC, 4);
 271         sl->q_buf[3] |= 1;
 272         stlink_write_mem32(sl, 0xE000EDFC, 4);
 273
 274         // make sure all watchpoints are cleared
 275         memset(sl->q_buf, 0, 4);
 276         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 277                 data_watches[i].fun = WATCHDISABLED;
 278                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 279         }
 280 }
 281
 282 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 283 {
 284         int i = 0;
 285         uint32_t mask;
 286
 287         // computer mask
 288         // find a free watchpoint
 289         // configure
 290
 291         mask = -1;
 292         i = len;
 293         while(i) {
 294                 i >>= 1;
 295                 mask++;
 296         }
 297
 298         if((mask != -1) && (mask < 16)) {
 299                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 300                         // is this an empty slot ?
 301                         if(data_watches[i].fun == WATCHDISABLED) {
 302                                 #ifdef DEBUG
 303                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 304                                 #endif
 305
 306                                 data_watches[i].fun = wf;
 307                                 data_watches[i].addr = addr;
 308                                 data_watches[i].mask = mask;
 309
 310                                 // insert comparator address
 311                                 sl->q_buf[0] = (addr & 0xff);
 312                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 313                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 314                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 315
 316                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 317
 318                                 // insert mask
 319                                 memset(sl->q_buf, 0, 4);
 320                                 sl->q_buf[0] = mask;
 321                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 322
 323                                 // insert function
 324                                 memset(sl->q_buf, 0, 4);
 325                                 sl->q_buf[0] = wf;
 326                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 327
 328                                 // just to make sure the matched bit is clear !
 329                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 330                                 return 0;
 331                         }
 332                 }
 333         }
 334
 335         #ifdef DEBUG
 336         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 337         #endif
 338         return -1;
 339 }
 340
 341 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 342 {
 343         int i;
 344
 345         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 346                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 347                         #ifdef DEBUG
 348                         printf("delete watchpoint %d addr %x\n", i, addr);
 349                         #endif
 350
 351                         memset(sl->q_buf, 0, 4);
 352                         data_watches[i].fun = WATCHDISABLED;
 353                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 354
 355                         return 0;
 356                 }
 357         }
 358
 359         #ifdef DEBUG
 360         printf("failure: delete watchpoint addr %x\n", addr);
 361         #endif
 362
 363         return -1;
 364 }
 365
 366 #define CODE_BREAK_NUM  6
 367 #define CODE_BREAK_LOW  0x01
 368 #define CODE_BREAK_HIGH 0x02
 369
 370 struct code_hw_breakpoint {
 371         stm32_addr_t addr;
 372         int          type;
 373 };
 374
 375 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 376
 377 static void init_code_breakpoints(stlink_t *sl) {
 378         memset(sl->q_buf, 0, 4);
 379         sl->q_buf[0] = 0x03; // KEY | ENABLE
 380         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 381         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 382         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 383
 384         memset(sl->q_buf, 0, 4);
 385         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 386                 code_breaks[i].type = 0;
 387                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 388         }
 389 }
 390
 391 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 392         stm32_addr_t fpb_addr = addr & ~0x3;
 393         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 394
 395         if(addr & 1) {
 396                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 397                 return -1;
 398         }
 399
 400         int id = -1;
 401         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 402                 if(fpb_addr == code_breaks[i].addr ||
 403                         (set && code_breaks[i].type == 0)) {
 404                         id = i;
 405                         break;
 406                 }
 407         }
 408
 409         if(id == -1) {
 410                 if(set) return -1; // Free slot not found
 411                 else    return 0;  // Breakpoint is already removed
 412         }
 413
 414         struct code_hw_breakpoint* brk = &code_breaks[id];
 415
 416         brk->addr = fpb_addr;
 417
 418         if(set) brk->type |= type;
 419         else    brk->type &= ~type;
 420
 421         memset(sl->q_buf, 0, 4);
 422
 423         if(brk->type == 0) {
 424                 #ifdef DEBUG
 425                 printf("clearing hw break %d\n", id);
 426                 #endif
 427
 428                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 429         } else {
 430                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 431                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 432                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 433                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 434
 435                 #ifdef DEBUG
 436                 printf("setting hw break %d at %08x (%d)\n",
 437                         id, brk->addr, brk->type);
 438                 printf("reg %02x %02x %02x %02x\n",
 439                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 440                 #endif
 441
 442                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 443         }
 444
 445         return 0;
 446 }
 447
 448
 449 struct flash_block {
 450         stm32_addr_t addr;
 451         unsigned     length;
 452         uint8_t*     data;
 453
 454         struct flash_block* next;
 455 };
 456
 457 static struct flash_block* flash_root;
 458
 459 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 460
 461         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 462                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 463                 return -1;
 464         }
 465
 466         stlink_calculate_pagesize(sl, addr);
 467         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 468                 fprintf(stderr, "flash_add_block: unaligned block\n");
 469                 return -1;
 470         }
 471
 472         struct flash_block* new = malloc(sizeof(struct flash_block));
 473         new->next = flash_root;
 474
 475         new->addr   = addr;
 476         new->length = length;
 477         new->data   = calloc(length, 1);
 478
 479         flash_root = new;
 480
 481         return 0;
 482 }
 483
 484 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 485         int fit_blocks = 0, fit_length = 0;
 486
 487         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 488                 /* Block: ------X------Y--------
 489                  * Data:            a-----b
 490                  *                a--b
 491                  *            a-----------b
 492                  * Block intersects with data, if:
 493                  *  a < Y && b > x
 494                  */
 495
 496                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 497                 unsigned a = addr, b = addr + length;
 498                 if(a < Y && b > X) {
 499                         // from start of the block
 500                         unsigned start = (a > X ? a : X) - X;
 501                         unsigned end   = (b > Y ? Y : b) - X;
 502
 503                         memcpy(fb->data + start, data, end - start);
 504
 505                         fit_blocks++;
 506                         fit_length += end - start;
 507                 }
 508         }
 509
 510         if(fit_blocks == 0) {
 511                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 512                 return -1;
 513         }
 514
 515         if(fit_length != length) {
 516                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 517                         addr, length, fit_length);
 518                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 519         }
 520
 521         return 0;
 522 }
 523
 524 static int flash_go(stlink_t *sl) {
 525         int error = -1;
 526
 527         // Some kinds of clock settings do not allow writing to flash.
 528         stlink_reset(sl);
 529
 530         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 531                 #ifdef DEBUG
 532                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 533                 #endif
 534
 535                 unsigned length = fb->length;
 536                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 537
 538                         //Update FLASH_PAGE
 539                         stlink_calculate_pagesize(sl, page);
 540
 541                         #ifdef DEBUG
 542                         printf("flash_do: page %08x\n", page);
 543                         #endif
 544
 545                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 546                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 547                                 goto error;
 548                         }
 549         }
 550
 551         stlink_reset(sl);
 552
 553         error = 0;
 554
 555 error:
 556         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 557                 next = fb->next;
 558                 free(fb->data);
 559                 free(fb);
 560         }
 561
 562         flash_root = NULL;
 563
 564         return error;
 565 }
 566
 567 int serve(stlink_t *sl, int port) {
 568         int sock = socket(AF_INET, SOCK_STREAM, 0);
 569         if(sock < 0) {
 570                 perror("socket");
 571                 return 1;
 572         }
 573
 574         unsigned int val = 1;
 575         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 576
 577         struct sockaddr_in serv_addr = {0};
 578         serv_addr.sin_family = AF_INET;
 579         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 580         serv_addr.sin_port = htons(port);
 581
 582         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 583                 perror("bind");
 584                 return 1;
 585         }
 586
 587         if(listen(sock, 5) < 0) {
 588                 perror("listen");
 589                 return 1;
 590         }
 591
 592         stlink_force_debug(sl);
 593         stlink_reset(sl);
 594         init_code_breakpoints(sl);
 595         init_data_watchpoints(sl);
 596
 597         printf("Listening at *:%d...\n", port);
 598
 599         int client = accept(sock, NULL, NULL);
 600         signal (SIGINT, SIG_DFL);
 601         if(client < 0) {
 602                 perror("accept");
 603                 return 1;
 604         }
 605
 606         close(sock);
 607
 608         printf("GDB connected.\n");
 609
 610         /*
 611          * To allow resetting the chip from GDB it is required to
 612          * emulate attaching and detaching to target.
 613          */
 614         unsigned int attached = 1;
 615
 616         while(1) {
 617                 char* packet;
 618
 619                 int status = gdb_recv_packet(client, &packet);
 620                 if(status < 0) {
 621                         fprintf(stderr, "cannot recv: %d\n", status);
 622                         return 1;
 623                 }
 624
 625                 #ifdef DEBUG
 626                 printf("recv: %s\n", packet);
 627                 #endif
 628
 629                 char* reply = NULL;
 630                 reg regp;
 631
 632                 switch(packet[0]) {
 633                 case 'q': {
 634                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 635                                 reply = strdup("");
 636                                 break;
 637                         }
 638
 639                         char *separator = strstr(packet, ":"), *params = "";
 640                         if(separator == NULL) {
 641                                 separator = packet + strlen(packet);
 642                         } else {
 643                                 params = separator + 1;
 644                         }
 645
 646                         unsigned queryNameLength = (separator - &packet[1]);
 647                         char* queryName = calloc(queryNameLength + 1, 1);
 648                         strncpy(queryName, &packet[1], queryNameLength);
 649
 650                         #ifdef DEBUG
 651                         printf("query: %s;%s\n", queryName, params);
 652                         #endif
 653
 654                         if(!strcmp(queryName, "Supported")) {
 655                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 656                         } else if(!strcmp(queryName, "Xfer")) {
 657                                 char *type, *op, *s_addr, *s_length;
 658                                 char *tok = params;
 659                                 char *annex __attribute__((unused));
 660
 661                                 type     = strsep(&tok, ":");
 662                                 op       = strsep(&tok, ":");
 663                                 annex    = strsep(&tok, ":");
 664                                 s_addr   = strsep(&tok, ",");
 665                                 s_length = tok;
 666
 667                                 unsigned addr = strtoul(s_addr, NULL, 16),
 668                                        length = strtoul(s_length, NULL, 16);
 669
 670                                 #ifdef DEBUG
 671                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 672                                         type, op, annex, addr, length);
 673                                 #endif
 674
 675                                 const char* data = NULL;
 676
 677                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 678                                         data = current_memory_map;
 679
 680                                 if(data) {
 681                                         unsigned data_length = strlen(data);
 682                                         if(addr + length > data_length)
 683                                                 length = data_length - addr;
 684
 685                                         if(length == 0) {
 686                                                 reply = strdup("l");
 687                                         } else {
 688                                                 reply = calloc(length + 2, 1);
 689                                                 reply[0] = 'm';
 690                                                 strncpy(&reply[1], data, length);
 691                                         }
 692                                 }
 693                         }
 694
 695                         if(reply == NULL)
 696                                 reply = strdup("");
 697
 698                         free(queryName);
 699
 700                         break;
 701                 }
 702
 703                 case 'v': {
 704                         char *params = NULL;
 705                         char *cmdName = strtok_r(packet, ":;", &params);
 706
 707                         cmdName++; // vCommand -> Command
 708
 709                         if(!strcmp(cmdName, "FlashErase")) {
 710                                 char *s_addr, *s_length;
 711                                 char *tok = params;
 712
 713                                 s_addr   = strsep(&tok, ",");
 714                                 s_length = tok;
 715
 716                                 unsigned addr = strtoul(s_addr, NULL, 16),
 717                                        length = strtoul(s_length, NULL, 16);
 718
 719                                 #ifdef DEBUG
 720                                 printf("FlashErase: addr:%08x,len:%04x\n",
 721                                         addr, length);
 722                                 #endif
 723
 724                                 if(flash_add_block(addr, length, sl) < 0) {
 725                                         reply = strdup("E00");
 726                                 } else {
 727                                         reply = strdup("OK");
 728                                 }
 729                         } else if(!strcmp(cmdName, "FlashWrite")) {
 730                                 char *s_addr, *data;
 731                                 char *tok = params;
 732
 733                                 s_addr = strsep(&tok, ":");
 734                                 data   = tok;
 735
 736                                 unsigned addr = strtoul(s_addr, NULL, 16);
 737                                 unsigned data_length = status - (data - packet);
 738
 739                                 // Length of decoded data cannot be more than
 740                                 // encoded, as escapes are removed.
 741                                 // Additional byte is reserved for alignment fix.
 742                                 uint8_t *decoded = calloc(data_length + 1, 1);
 743                                 unsigned dec_index = 0;
 744                                 for(int i = 0; i < data_length; i++) {
 745                                         if(data[i] == 0x7d) {
 746                                                 i++;
 747                                                 decoded[dec_index++] = data[i] ^ 0x20;
 748                                         } else {
 749                                                 decoded[dec_index++] = data[i];
 750                                         }
 751                                 }
 752
 753                                 // Fix alignment
 754                                 if(dec_index % 2 != 0)
 755                                         dec_index++;
 756
 757                                 #ifdef DEBUG
 758                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 759                                 #endif
 760
 761                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 762                                         reply = strdup("E00");
 763                                 } else {
 764                                         reply = strdup("OK");
 765                                 }
 766                         } else if(!strcmp(cmdName, "FlashDone")) {
 767                                 if(flash_go(sl) < 0) {
 768                                         reply = strdup("E00");
 769                                 } else {
 770                                         reply = strdup("OK");
 771                                 }
 772                         } else if(!strcmp(cmdName, "Kill")) {
 773                                 attached = 0;
 774
 775                                 reply = strdup("OK");
 776                         }
 777
 778                         if(reply == NULL)
 779                                 reply = strdup("");
 780
 781                         break;
 782                 }
 783
 784                 case 'c':
 785                         stlink_run(sl);
 786
 787                         while(1) {
 788                                 int status = gdb_check_for_interrupt(client);
 789                                 if(status < 0) {
 790                                         fprintf(stderr, "cannot check for int: %d\n", status);
 791                                         return 1;
 792                                 }
 793
 794                                 if(status == 1) {
 795                                         stlink_force_debug(sl);
 796                                         break;
 797                                 }
 798
 799                                 stlink_status(sl);
 800                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 801                                         break;
 802                                 }
 803
 804                                 usleep(100000);
 805                         }
 806
 807                         reply = strdup("S05"); // TRAP
 808                         break;
 809
 810                 case 's':
 811                         stlink_step(sl);
 812
 813                         reply = strdup("S05"); // TRAP
 814                         break;
 815
 816                 case '?':
 817                         if(attached) {
 818                                 reply = strdup("S05"); // TRAP
 819                         } else {
 820                                 /* Stub shall reply OK if not attached. */
 821                                 reply = strdup("OK");
 822                         }
 823                         break;
 824
 825                 case 'g':
 826                         stlink_read_all_regs(sl, &regp);
 827
 828                         reply = calloc(8 * 16 + 1, 1);
 829                         for(int i = 0; i < 16; i++)
 830                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 831
 832                         break;
 833
 834                 case 'p': {
 835                         unsigned id = strtoul(&packet[1], NULL, 16);
 836                         unsigned myreg = 0xDEADDEAD;
 837
 838                         if(id < 16) {
 839                                 stlink_read_reg(sl, id, &regp);
 840                                 myreg = htonl(regp.r[id]);
 841                         } else if(id == 0x19) {
 842                                 stlink_read_reg(sl, 16, &regp);
 843                                 myreg = htonl(regp.xpsr);
 844                         } else {
 845                                 reply = strdup("E00");
 846                         }
 847
 848                         reply = calloc(8 + 1, 1);
 849                         sprintf(reply, "%08x", myreg);
 850
 851                         break;
 852                 }
 853
 854                 case 'P': {
 855                         char* s_reg = &packet[1];
 856                         char* s_value = strstr(&packet[1], "=") + 1;
 857
 858                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 859                         unsigned value = strtoul(s_value, NULL, 16);
 860
 861                         if(reg < 16) {
 862                                 stlink_write_reg(sl, ntohl(value), reg);
 863                         } else if(reg == 0x19) {
 864                                 stlink_write_reg(sl, ntohl(value), 16);
 865                         } else {
 866                                 reply = strdup("E00");
 867                         }
 868
 869                         if(!reply) {
 870                                 reply = strdup("OK");
 871                         }
 872
 873                         break;
 874                 }
 875
 876                 case 'G':
 877                         for(int i = 0; i < 16; i++) {
 878                                 char str[9] = {0};
 879                                 strncpy(str, &packet[1 + i * 8], 8);
 880                                 uint32_t reg = strtoul(str, NULL, 16);
 881                                 stlink_write_reg(sl, ntohl(reg), i);
 882                         }
 883
 884                         reply = strdup("OK");
 885                         break;
 886
 887                 case 'm': {
 888                         char* s_start = &packet[1];
 889                         char* s_count = strstr(&packet[1], ",") + 1;
 890
 891                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 892                         unsigned     count = strtoul(s_count, NULL, 16);
 893
 894                         unsigned adj_start = start % 4;
 895
 896                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 897                                                 count : count + 4 - (count % 4));
 898
 899                         reply = calloc(count * 2 + 1, 1);
 900                         for(int i = 0; i < count; i++) {
 901                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 902                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 903                         }
 904
 905                         break;
 906                 }
 907
 908                 case 'M': {
 909                         char* s_start = &packet[1];
 910                         char* s_count = strstr(&packet[1], ",") + 1;
 911                         char* hexdata = strstr(packet, ":") + 1;
 912
 913                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 914                         unsigned     count = strtoul(s_count, NULL, 16);
 915
 916                         for(int i = 0; i < count; i ++) {
 917                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 918                                 uint8_t byte = strtoul(hex, NULL, 16);
 919                                 sl->q_buf[i] = byte;
 920                         }
 921
 922                         if((count % 4) == 0 && (start % 4) == 0) {
 923                                 stlink_write_mem32(sl, start, count);
 924                         } else {
 925                                 stlink_write_mem8(sl, start, count);
 926                         }
 927
 928                         reply = strdup("OK");
 929
 930                         break;
 931                 }
 932
 933                 case 'Z': {
 934                         char *endptr;
 935                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 936                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 937
 938                         switch (packet[1]) {
 939                                 case '1':
 940                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 941                                         reply = strdup("E00");
 942                                 } else {
 943                                         reply = strdup("OK");
 944                                 }
 945                                 break;
 946
 947                                 case '2':   // insert write watchpoint
 948                                 case '3':   // insert read  watchpoint
 949                                 case '4':   // insert access watchpoint
 950                                 {
 951                                         enum watchfun wf;
 952                                         if(packet[1] == '2') {
 953                                                 wf = WATCHWRITE;
 954                                         } else if(packet[1] == '3') {
 955                                                 wf = WATCHREAD;
 956                                         } else {
 957                                                 wf = WATCHACCESS;
 958                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 959                                                         reply = strdup("E00");
 960                                                 } else {
 961                                                         reply = strdup("OK");
 962                                                         break;
 963                                                 }
 964                                         }
 965                                 }
 966
 967                                 default:
 968                                 reply = strdup("");
 969                         }
 970                         break;
 971                 }
 972                 case 'z': {
 973                         char *endptr;
 974                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 975                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 976
 977                         switch (packet[1]) {
 978                                 case '1': // remove breakpoint
 979                                 update_code_breakpoint(sl, addr, 0);
 980                                 reply = strdup("OK");
 981                                 break;
 982
 983                                 case '2' : // remove write watchpoint
 984                                 case '3' : // remove read watchpoint
 985                                 case '4' : // remove access watchpoint
 986                                 if(delete_data_watchpoint(sl, addr) < 0) {
 987                                         reply = strdup("E00");
 988                                 } else {
 989                                         reply = strdup("OK");
 990                                         break;
 991                                 }
 992
 993                                 default:
 994                                 reply = strdup("");
 995                         }
 996                         break;
 997                 }
 998
 999                 case '!': {
1000                         /*
1001                          * Enter extended mode which allows restarting.
1002                          * We do support that always.
1003                          */
1004
1005                         reply = strdup("OK");
1006
1007                         break;
1008                 }
1009
1010                 case 'R': {
1011                         /* Reset the core. */
1012
1013                         stlink_reset(sl);
1014                         init_code_breakpoints(sl);
1015                         init_data_watchpoints(sl);
1016
1017                         attached = 1;
1018
1019                         reply = strdup("OK");
1020
1021                         break;
1022                 }
1023
1024                 default:
1025                         reply = strdup("");
1026                 }
1027
1028                 if(reply) {
1029                         #ifdef DEBUG
1030                         printf("send: %s\n", reply);
1031                         #endif
1032
1033                         int result = gdb_send_packet(client, reply);
1034                         if(result != 0) {
1035                                 fprintf(stderr, "cannot send: %d\n", result);
1036                                 return 1;
1037                         }
1038
1039                         free(reply);
1040                 }
1041
1042                 free(packet);
1043         }
1044
1045         return 0;
1046 }