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

   1 /*
   2  * Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   3  * Use of this source code is governed by a BSD-style
   4  * license that can be found in the LICENSE file.
   5  */
   6
   7 #include <getopt.h>
   8 #include <signal.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <signal.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #ifdef __MINGW32__
  16 #include "mingw.h"
  17 #else
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #endif
  22
  23 #include <stlink-common.h>
  24 #include <uglylogging.h>
  25
  26 #include "gdb-remote.h"
  27 #include "gdb-server.h"
  28
  29 #define FLASH_BASE 0x08000000
  30
  31 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  32 #define FLASH_PAGE (sl->flash_pgsz)
  33
  34 stlink_t *connected_stlink = NULL;
  35
  36 static const char hex[] = "0123456789abcdef";
  37
  38 static const char* current_memory_map = NULL;
  39
  40 typedef struct _st_state_t {
  41     // things from command line, bleh
  42     int stlink_version;
  43     int logging_level;
  44     int listen_port;
  45     int persistent;
  46     int reset;
  47 } st_state_t;
  48
  49
  50 int serve(stlink_t *sl, st_state_t *st);
  51 char* make_memory_map(stlink_t *sl);
  52
  53 static void cleanup(int signal __attribute__((unused))) {
  54     if (connected_stlink) {
  55         /* Switch back to mass storage mode before closing. */
  56         stlink_run(connected_stlink);
  57         stlink_exit_debug_mode(connected_stlink);
  58         stlink_close(connected_stlink);
  59     }
  60
  61     exit(1);
  62 }
  63
  64
  65
  66 int parse_options(int argc, char** argv, st_state_t *st) {
  67     static struct option long_options[] = {
  68         {"help", no_argument, NULL, 'h'},
  69         {"verbose", optional_argument, NULL, 'v'},
  70         {"stlink_version", required_argument, NULL, 's'},
  71         {"stlinkv1", no_argument, NULL, '1'},
  72         {"listen_port", required_argument, NULL, 'p'},
  73         {"multi", optional_argument, NULL, 'm'},
  74         {"no-reset", optional_argument, NULL, 'n'},
  75         {0, 0, 0, 0},
  76     };
  77     const char * help_str = "%s - usage:\n\n"
  78         "  -h, --help\t\tPrint this help\n"
  79         "  -vXX, --verbose=XX\tSpecify a specific verbosity level (0..99)\n"
  80         "  -v, --verbose\t\tSpecify generally verbose logging\n"
  81         "  -s X, --stlink_version=X\n"
  82         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  83         "  -1, --stlinkv1\tForce stlink version 1\n"
  84         "  -p 4242, --listen_port=1234\n"
  85         "\t\t\tSet the gdb server listen port. "
  86         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  87         "  -m, --multi\n"
  88         "\t\t\tSet gdb server to extended mode.\n"
  89         "\t\t\tst-util will continue listening for connections after disconnect.\n"
  90         "  -n, --no-reset\n"
  91         "\t\t\tDo not reset board on connection.\n"
  92         "\n"
  93         "The STLINKv2 device to use can be specified in the environment\n"
  94         "variable STLINK_DEVICE on the format <USB_BUS>:<USB_ADDR>.\n"
  95         "\n"
  96         ;
  97
  98
  99     int option_index = 0;
 100     int c;
 101     int q;
 102     while ((c = getopt_long(argc, argv, "hv::s:1p:mn", long_options, &option_index)) != -1) {
 103         switch (c) {
 104             case 0:
 105                 printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 106                 printf("option %s", long_options[option_index].name);
 107                 if (optarg) {
 108                     printf(" with arg %s", optarg);
 109                 }
 110                 printf("\n");
 111                 break;
 112             case 'h':
 113                 printf(help_str, argv[0]);
 114                 exit(EXIT_SUCCESS);
 115                 break;
 116             case 'v':
 117                 if (optarg) {
 118                     st->logging_level = atoi(optarg);
 119                 } else {
 120                     st->logging_level = DEFAULT_LOGGING_LEVEL;
 121                 }
 122                 break;
 123             case '1':
 124                 st->stlink_version = 1;
 125                 break;
 126             case 's':
 127                 sscanf(optarg, "%i", &q);
 128                 if (q < 0 || q > 2) {
 129                     fprintf(stderr, "stlink version %d unknown!\n", q);
 130                     exit(EXIT_FAILURE);
 131                 }
 132                 st->stlink_version = q;
 133                 break;
 134             case 'p':
 135                 sscanf(optarg, "%i", &q);
 136                 if (q < 0) {
 137                     fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 138                     exit(EXIT_FAILURE);
 139                 }
 140                 st->listen_port = q;
 141                 break;
 142             case 'm':
 143                 st->persistent = 1;
 144                 break;
 145             case 'n':
 146                 st->reset = 0;
 147                 break;
 148         }
 149     }
 150
 151     if (optind < argc) {
 152         printf("non-option ARGV-elements: ");
 153         while (optind < argc)
 154             printf("%s ", argv[optind++]);
 155         printf("\n");
 156     }
 157     return 0;
 158 }
 159
 160
 161 int main(int argc, char** argv) {
 162     int32_t voltage;
 163
 164     stlink_t *sl = NULL;
 165
 166     st_state_t state;
 167     memset(&state, 0, sizeof(state));
 168     // set defaults...
 169     state.stlink_version = 2;
 170     state.logging_level = DEFAULT_LOGGING_LEVEL;
 171     state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 172     state.reset = 1;    /* By default, reset board */
 173     parse_options(argc, argv, &state);
 174     switch (state.stlink_version) {
 175         case 2:
 176             sl = stlink_open_usb(state.logging_level, 0);
 177             if(sl == NULL) return 1;
 178             break;
 179         case 1:
 180             sl = stlink_v1_open(state.logging_level, 0);
 181             if(sl == NULL) return 1;
 182             break;
 183     }
 184
 185     connected_stlink = sl;
 186     signal(SIGINT, &cleanup);
 187     signal(SIGTERM, &cleanup);
 188
 189     if (state.reset) {
 190         stlink_reset(sl);
 191     }
 192
 193     ILOG("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 194
 195     voltage = stlink_target_voltage(sl);
 196     if (voltage != -1) {
 197         ILOG("Target voltage is %d mV.\n", voltage);
 198     }
 199
 200     sl->verbose=0;
 201
 202     current_memory_map = make_memory_map(sl);
 203
 204 #ifdef __MINGW32__
 205     WSADATA     wsadata;
 206     if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 207         goto winsock_error;
 208     }
 209 #endif
 210
 211     do {
 212         if (serve(sl, &state)) {
 213           sleep (1); // don't go bezurk if serve returns with error
 214         }
 215
 216         /* Continue */
 217         stlink_run(sl);
 218     } while (state.persistent);
 219
 220 #ifdef __MINGW32__
 221 winsock_error:
 222     WSACleanup();
 223 #endif
 224
 225     /* Switch back to mass storage mode before closing. */
 226     stlink_exit_debug_mode(sl);
 227     stlink_close(sl);
 228
 229     return 0;
 230 }
 231
 232 static const char* const target_description_F4 =
 233     "<?xml version=\"1.0\"?>"
 234     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 235     "<target version=\"1.0\">"
 236     "   <architecture>arm</architecture>"
 237     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 238     "       <reg name=\"r0\" bitsize=\"32\"/>"
 239     "       <reg name=\"r1\" bitsize=\"32\"/>"
 240     "       <reg name=\"r2\" bitsize=\"32\"/>"
 241     "       <reg name=\"r3\" bitsize=\"32\"/>"
 242     "       <reg name=\"r4\" bitsize=\"32\"/>"
 243     "       <reg name=\"r5\" bitsize=\"32\"/>"
 244     "       <reg name=\"r6\" bitsize=\"32\"/>"
 245     "       <reg name=\"r7\" bitsize=\"32\"/>"
 246     "       <reg name=\"r8\" bitsize=\"32\"/>"
 247     "       <reg name=\"r9\" bitsize=\"32\"/>"
 248     "       <reg name=\"r10\" bitsize=\"32\"/>"
 249     "       <reg name=\"r11\" bitsize=\"32\"/>"
 250     "       <reg name=\"r12\" bitsize=\"32\"/>"
 251     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 252     "       <reg name=\"lr\" bitsize=\"32\"/>"
 253     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 254     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 255     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 256     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 257     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 258     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 259     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 260     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 261     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 262     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 263     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 264     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 271     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 272     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 285     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 286     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 287     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 288     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 289     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 290     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 291     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 292     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 293     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 294     "   </feature>"
 295     "</target>";
 296
 297 static const char* const memory_map_template_F4 =
 298     "<?xml version=\"1.0\"?>"
 299     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 300     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 301     "<memory-map>"
 302     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"     // code = sram, bootrom or flash; flash is bigger
 303     "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"      // ccm ram
 304     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"      // sram
 305     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 306     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 307     "  </memory>"
 308     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 309     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 310     "  </memory>"
 311     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0xE0000\">"     //Sectors 5..11
 312     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 313     "  </memory>"
 314     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 315     "  <memory type=\"ram\" start=\"0x60000000\" length=\"0x7fffffff\"/>"   // AHB3 Peripherals
 316     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 317     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 318     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 319     "</memory-map>";
 320
 321 static const char* const memory_map_template_F4_HD =
 322     "<?xml version=\"1.0\"?>"
 323     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 324     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 325     "<memory-map>"
 326     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"     // code = sram, bootrom or flash; flash is bigger
 327     "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"      // ccm ram
 328     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"      // sram
 329     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 330     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 331     "  </memory>"
 332     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 333     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 334     "  </memory>"
 335     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0xE0000\">"     //Sectors 5..11
 336     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 337     "  </memory>"
 338     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 339     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 340     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 341     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 342     "</memory-map>";
 343
 344 static const char* const memory_map_template =
 345     "<?xml version=\"1.0\"?>"
 346     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 347     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 348     "<memory-map>"
 349     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 350     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram 8k
 351     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 352     "    <property name=\"blocksize\">0x%zx</property>"
 353     "  </memory>"
 354     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 355     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 356     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 357     "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"         // option byte area
 358     "</memory-map>";
 359
 360 char* make_memory_map(stlink_t *sl) {
 361     /* This will be freed in serve() */
 362     char* map = malloc(4096);
 363     map[0] = '\0';
 364
 365     if(sl->chip_id==STM32_CHIPID_F4) {
 366         strcpy(map, memory_map_template_F4);
 367     } else if(sl->chip_id==STM32_CHIPID_F4_HD) {
 368         strcpy(map, memory_map_template_F4_HD);
 369     } else {
 370         snprintf(map, 4096, memory_map_template,
 371                 sl->flash_size,
 372                 sl->sram_size,
 373                 sl->flash_size, sl->flash_pgsz,
 374                 sl->sys_base, sl->sys_size);
 375     }
 376     return map;
 377 }
 378
 379
 380 /*
 381  * DWT_COMP0     0xE0001020
 382  * DWT_MASK0     0xE0001024
 383  * DWT_FUNCTION0 0xE0001028
 384  * DWT_COMP1     0xE0001030
 385  * DWT_MASK1     0xE0001034
 386  * DWT_FUNCTION1 0xE0001038
 387  * DWT_COMP2     0xE0001040
 388  * DWT_MASK2     0xE0001044
 389  * DWT_FUNCTION2 0xE0001048
 390  * DWT_COMP3     0xE0001050
 391  * DWT_MASK3     0xE0001054
 392  * DWT_FUNCTION3 0xE0001058
 393  */
 394
 395 #define DATA_WATCH_NUM 4
 396
 397 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 398
 399 struct code_hw_watchpoint {
 400     stm32_addr_t addr;
 401     uint8_t mask;
 402     enum watchfun fun;
 403 };
 404
 405 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 406
 407 static void init_data_watchpoints(stlink_t *sl) {
 408     DLOG("init watchpoints\n");
 409
 410     // set trcena in debug command to turn on dwt unit
 411     stlink_write_debug32(sl, 0xE000EDFC,
 412             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 413
 414     // make sure all watchpoints are cleared
 415     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 416         data_watches[i].fun = WATCHDISABLED;
 417         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 418     }
 419 }
 420
 421 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 422                                stm32_addr_t addr, unsigned int len) {
 423     int i = 0;
 424     uint32_t mask;
 425
 426     // computer mask
 427     // find a free watchpoint
 428     // configure
 429
 430     mask = -1;
 431     i = len;
 432     while(i) {
 433         i >>= 1;
 434         mask++;
 435     }
 436
 437     if((mask != (uint32_t)-1) && (mask < 16)) {
 438         for(i = 0; i < DATA_WATCH_NUM; i++) {
 439             // is this an empty slot ?
 440             if(data_watches[i].fun == WATCHDISABLED) {
 441                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 442
 443                 data_watches[i].fun = wf;
 444                 data_watches[i].addr = addr;
 445                 data_watches[i].mask = mask;
 446
 447                 // insert comparator address
 448                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 449
 450                 // insert mask
 451                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 452
 453                 // insert function
 454                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 455
 456                 // just to make sure the matched bit is clear !
 457                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 458                 return 0;
 459             }
 460         }
 461     }
 462
 463     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 464     return -1;
 465 }
 466
 467 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 468 {
 469     int i;
 470
 471     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 472         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 473             DLOG("delete watchpoint %d addr %x\n", i, addr);
 474
 475             data_watches[i].fun = WATCHDISABLED;
 476             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 477
 478             return 0;
 479         }
 480     }
 481
 482     DLOG("failure: delete watchpoint addr %x\n", addr);
 483
 484     return -1;
 485 }
 486
 487 #define CODE_BREAK_NUM  6
 488 #define CODE_LIT_NUM    2
 489 #define CODE_BREAK_LOW  0x01
 490 #define CODE_BREAK_HIGH 0x02
 491
 492 struct code_hw_breakpoint {
 493     stm32_addr_t addr;
 494     int          type;
 495 };
 496
 497 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 498
 499 static void init_code_breakpoints(stlink_t *sl) {
 500     memset(sl->q_buf, 0, 4);
 501     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 502     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 503     if (((val & 3) != 1) ||
 504             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 505             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 506         ELOG("[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 507                 ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 508     }
 509
 510
 511     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 512         code_breaks[i].type = 0;
 513         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 514     }
 515 }
 516
 517 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 518     stm32_addr_t fpb_addr = addr & ~0x3;
 519     int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 520
 521     if(addr & 1) {
 522         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 523         return -1;
 524     }
 525
 526     int id = -1;
 527     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 528         if(fpb_addr == code_breaks[i].addr ||
 529                 (set && code_breaks[i].type == 0)) {
 530             id = i;
 531             break;
 532         }
 533     }
 534
 535     if(id == -1) {
 536         if(set) return -1; // Free slot not found
 537         else    return 0;  // Breakpoint is already removed
 538     }
 539
 540     struct code_hw_breakpoint* brk = &code_breaks[id];
 541
 542     brk->addr = fpb_addr;
 543
 544     if(set) brk->type |= type;
 545     else        brk->type &= ~type;
 546
 547     if(brk->type == 0) {
 548         DLOG("clearing hw break %d\n", id);
 549
 550         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 551     } else {
 552         uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 553
 554         DLOG("setting hw break %d at %08x (%d)\n",
 555                     id, brk->addr, brk->type);
 556         DLOG("reg %08x \n",
 557                     mask);
 558
 559         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 560     }
 561
 562     return 0;
 563 }
 564
 565
 566 struct flash_block {
 567     stm32_addr_t addr;
 568     unsigned     length;
 569     uint8_t*     data;
 570
 571     struct flash_block* next;
 572 };
 573
 574 static struct flash_block* flash_root;
 575
 576 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 577
 578     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 579         ELOG("flash_add_block: incorrect bounds\n");
 580         return -1;
 581     }
 582
 583     stlink_calculate_pagesize(sl, addr);
 584     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 585         ELOG("flash_add_block: unaligned block\n");
 586         return -1;
 587     }
 588
 589     struct flash_block* new = malloc(sizeof(struct flash_block));
 590     new->next = flash_root;
 591
 592     new->addr   = addr;
 593     new->length = length;
 594     new->data   = calloc(length, 1);
 595
 596     flash_root = new;
 597
 598     return 0;
 599 }
 600
 601 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 602     unsigned int fit_blocks = 0, fit_length = 0;
 603
 604     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 605         /* Block: ------X------Y--------
 606          * Data:            a-----b
 607          *                a--b
 608          *            a-----------b
 609          * Block intersects with data, if:
 610          *  a < Y && b > x
 611          */
 612
 613         unsigned X = fb->addr, Y = fb->addr + fb->length;
 614         unsigned a = addr, b = addr + length;
 615         if(a < Y && b > X) {
 616             // from start of the block
 617             unsigned start = (a > X ? a : X) - X;
 618             unsigned end   = (b > Y ? Y : b) - X;
 619
 620             memcpy(fb->data + start, data, end - start);
 621
 622             fit_blocks++;
 623             fit_length += end - start;
 624         }
 625     }
 626
 627     if(fit_blocks == 0) {
 628         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 629         return -1;
 630     }
 631
 632     if(fit_length != length) {
 633         WLOG("data block %08x -> %04x truncated to %04x\n",
 634                 addr, length, fit_length);
 635         WLOG("(this is not an error, just a GDB glitch)\n");
 636     }
 637
 638     return 0;
 639 }
 640
 641 static int flash_go(stlink_t *sl) {
 642     int error = -1;
 643
 644     // Some kinds of clock settings do not allow writing to flash.
 645     stlink_reset(sl);
 646
 647     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 648         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 649
 650         unsigned length = fb->length;
 651         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 652
 653             //Update FLASH_PAGE
 654             stlink_calculate_pagesize(sl, page);
 655
 656             DLOG("flash_do: page %08x\n", page);
 657             unsigned send = length > FLASH_PAGE ? FLASH_PAGE : length;
 658             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 659                         send) < 0)
 660                 goto error;
 661             length -= send;
 662
 663         }
 664     }
 665
 666     stlink_reset(sl);
 667
 668     error = 0;
 669
 670 error:
 671     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 672         next = fb->next;
 673         free(fb->data);
 674         free(fb);
 675     }
 676
 677     flash_root = NULL;
 678
 679     return error;
 680 }
 681
 682 int serve(stlink_t *sl, st_state_t *st) {
 683     int sock = socket(AF_INET, SOCK_STREAM, 0);
 684     if(sock < 0) {
 685         perror("socket");
 686         return 1;
 687     }
 688
 689     unsigned int val = 1;
 690     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 691
 692     struct sockaddr_in serv_addr;
 693     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 694     serv_addr.sin_family = AF_INET;
 695     serv_addr.sin_addr.s_addr = INADDR_ANY;
 696     serv_addr.sin_port = htons(st->listen_port);
 697
 698     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 699         perror("bind");
 700         return 1;
 701     }
 702
 703     if(listen(sock, 5) < 0) {
 704         perror("listen");
 705         return 1;
 706     }
 707
 708     ILOG("Listening at *:%d...\n", st->listen_port);
 709
 710     int client = accept(sock, NULL, NULL);
 711     //signal (SIGINT, SIG_DFL);
 712     if(client < 0) {
 713         perror("accept");
 714         return 1;
 715     }
 716
 717     close(sock);
 718
 719     stlink_force_debug(sl);
 720     if (st->reset) {
 721         stlink_reset(sl);
 722     }
 723     init_code_breakpoints(sl);
 724     init_data_watchpoints(sl);
 725
 726     ILOG("GDB connected.\n");
 727
 728     /*
 729      * To allow resetting the chip from GDB it is required to
 730      * emulate attaching and detaching to target.
 731      */
 732     unsigned int attached = 1;
 733
 734     while(1) {
 735         char* packet;
 736
 737         int status = gdb_recv_packet(client, &packet);
 738         if(status < 0) {
 739             ELOG("cannot recv: %d\n", status);
 740 #ifdef __MINGW32__
 741             win32_close_socket(sock);
 742 #endif
 743             return 1;
 744         }
 745
 746         DLOG("recv: %s\n", packet);
 747
 748         char* reply = NULL;
 749         reg regp;
 750
 751         switch(packet[0]) {
 752             case 'q': {
 753                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 754                     reply = strdup("");
 755                     break;
 756                 }
 757
 758                 char *separator = strstr(packet, ":"), *params = "";
 759                 if(separator == NULL) {
 760                     separator = packet + strlen(packet);
 761                 } else {
 762                     params = separator + 1;
 763                 }
 764
 765                 unsigned queryNameLength = (separator - &packet[1]);
 766                 char* queryName = calloc(queryNameLength + 1, 1);
 767                 strncpy(queryName, &packet[1], queryNameLength);
 768
 769                 DLOG("query: %s;%s\n", queryName, params);
 770
 771                 if(!strcmp(queryName, "Supported")) {
 772                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 773                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 774                     }
 775                     else {
 776                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 777                     }
 778                 } else if(!strcmp(queryName, "Xfer")) {
 779                     char *type, *op, *__s_addr, *s_length;
 780                     char *tok = params;
 781                     char *annex __attribute__((unused));
 782
 783                     type     = strsep(&tok, ":");
 784                     op       = strsep(&tok, ":");
 785                     annex    = strsep(&tok, ":");
 786                     __s_addr   = strsep(&tok, ",");
 787                     s_length = tok;
 788
 789                     unsigned addr = strtoul(__s_addr, NULL, 16),
 790                              length = strtoul(s_length, NULL, 16);
 791
 792                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 793                                 type, op, annex, addr, length);
 794
 795                     const char* data = NULL;
 796
 797                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 798                         data = current_memory_map;
 799
 800                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 801                         data = target_description_F4;
 802
 803                     if(data) {
 804                         unsigned data_length = strlen(data);
 805                         if(addr + length > data_length)
 806                             length = data_length - addr;
 807
 808                         if(length == 0) {
 809                             reply = strdup("l");
 810                         } else {
 811                             reply = calloc(length + 2, 1);
 812                             reply[0] = 'm';
 813                             strncpy(&reply[1], data, length);
 814                         }
 815                     }
 816                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 817                     // Rcmd uses the wrong separator
 818                     char *separator = strstr(packet, ","), *params = "";
 819                     if(separator == NULL) {
 820                         separator = packet + strlen(packet);
 821                     } else {
 822                         params = separator + 1;
 823                     }
 824
 825
 826                     if (!strncmp(params,"726573756d65",12)) {// resume
 827                         DLOG("Rcmd: resume\n");
 828                         stlink_run(sl);
 829
 830                         reply = strdup("OK");
 831                     } else if (!strncmp(params,"68616c74",8)) { //halt
 832                         reply = strdup("OK");
 833
 834                         stlink_force_debug(sl);
 835
 836                         DLOG("Rcmd: halt\n");
 837                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 838                         reply = strdup("OK");
 839
 840                         stlink_jtag_reset(sl, 0);
 841                         stlink_jtag_reset(sl, 1);
 842                         stlink_force_debug(sl);
 843
 844                         DLOG("Rcmd: jtag_reset\n");
 845                     } else if (!strncmp(params,"7265736574",10)) { //reset
 846                         reply = strdup("OK");
 847
 848                         stlink_force_debug(sl);
 849                         stlink_reset(sl);
 850                         init_code_breakpoints(sl);
 851                         init_data_watchpoints(sl);
 852
 853                         DLOG("Rcmd: reset\n");
 854                     } else {
 855                         DLOG("Rcmd: %s\n", params);
 856                     }
 857
 858                 }
 859
 860                 if(reply == NULL)
 861                     reply = strdup("");
 862
 863                 free(queryName);
 864
 865                 break;
 866             }
 867
 868             case 'v': {
 869                 char *params = NULL;
 870                 char *cmdName = strtok_r(packet, ":;", &params);
 871
 872                 cmdName++; // vCommand -> Command
 873
 874                 if(!strcmp(cmdName, "FlashErase")) {
 875                     char *__s_addr, *s_length;
 876                     char *tok = params;
 877
 878                     __s_addr   = strsep(&tok, ",");
 879                     s_length = tok;
 880
 881                     unsigned addr = strtoul(__s_addr, NULL, 16),
 882                              length = strtoul(s_length, NULL, 16);
 883
 884                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 885                                 addr, length);
 886
 887                     if(flash_add_block(addr, length, sl) < 0) {
 888                         reply = strdup("E00");
 889                     } else {
 890                         reply = strdup("OK");
 891                     }
 892                 } else if(!strcmp(cmdName, "FlashWrite")) {
 893                     char *__s_addr, *data;
 894                     char *tok = params;
 895
 896                     __s_addr = strsep(&tok, ":");
 897                     data   = tok;
 898
 899                     unsigned addr = strtoul(__s_addr, NULL, 16);
 900                     unsigned data_length = status - (data - packet);
 901
 902                     // Length of decoded data cannot be more than
 903                     // encoded, as escapes are removed.
 904                     // Additional byte is reserved for alignment fix.
 905                     uint8_t *decoded = calloc(data_length + 1, 1);
 906                     unsigned dec_index = 0;
 907                     for(unsigned int i = 0; i < data_length; i++) {
 908                         if(data[i] == 0x7d) {
 909                             i++;
 910                             decoded[dec_index++] = data[i] ^ 0x20;
 911                         } else {
 912                             decoded[dec_index++] = data[i];
 913                         }
 914                     }
 915
 916                     // Fix alignment
 917                     if(dec_index % 2 != 0)
 918                         dec_index++;
 919
 920                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 921
 922                     if(flash_populate(addr, decoded, dec_index) < 0) {
 923                         reply = strdup("E00");
 924                     } else {
 925                         reply = strdup("OK");
 926                     }
 927                 } else if(!strcmp(cmdName, "FlashDone")) {
 928                     if(flash_go(sl) < 0) {
 929                         reply = strdup("E00");
 930                     } else {
 931                         reply = strdup("OK");
 932                     }
 933                 } else if(!strcmp(cmdName, "Kill")) {
 934                     attached = 0;
 935
 936                     reply = strdup("OK");
 937                 }
 938
 939                 if(reply == NULL)
 940                     reply = strdup("");
 941
 942                 break;
 943             }
 944
 945             case 'c':
 946                 stlink_run(sl);
 947
 948                 while(1) {
 949                     int status = gdb_check_for_interrupt(client);
 950                     if(status < 0) {
 951                         ELOG("cannot check for int: %d\n", status);
 952 #ifdef __MINGW32__
 953                         win32_close_socket(sock);
 954 #endif
 955                         return 1;
 956                     }
 957
 958                     if(status == 1) {
 959                         stlink_force_debug(sl);
 960                         break;
 961                     }
 962
 963                     stlink_status(sl);
 964                     if(sl->core_stat == STLINK_CORE_HALTED) {
 965                         break;
 966                     }
 967
 968                     usleep(100000);
 969                 }
 970
 971                 reply = strdup("S05"); // TRAP
 972                 break;
 973
 974             case 's':
 975                 stlink_step(sl);
 976
 977                 reply = strdup("S05"); // TRAP
 978                 break;
 979
 980             case '?':
 981                 if(attached) {
 982                     reply = strdup("S05"); // TRAP
 983                 } else {
 984                     /* Stub shall reply OK if not attached. */
 985                     reply = strdup("OK");
 986                 }
 987                 break;
 988
 989             case 'g':
 990                 stlink_read_all_regs(sl, &regp);
 991
 992                 reply = calloc(8 * 16 + 1, 1);
 993                 for(int i = 0; i < 16; i++)
 994                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 995
 996                 break;
 997
 998             case 'p': {
 999                 unsigned id = strtoul(&packet[1], NULL, 16);
1000                 unsigned myreg = 0xDEADDEAD;
1001
1002                 if(id < 16) {
1003                     stlink_read_reg(sl, id, &regp);
1004                     myreg = htonl(regp.r[id]);
1005                 } else if(id == 0x19) {
1006                     stlink_read_reg(sl, 16, &regp);
1007                     myreg = htonl(regp.xpsr);
1008                 } else if(id == 0x1A) {
1009                     stlink_read_reg(sl, 17, &regp);
1010                     myreg = htonl(regp.main_sp);
1011                 } else if(id == 0x1B) {
1012                     stlink_read_reg(sl, 18, &regp);
1013                     myreg = htonl(regp.process_sp);
1014                 } else if(id == 0x1C) {
1015                     stlink_read_unsupported_reg(sl, id, &regp);
1016                     myreg = htonl(regp.control);
1017                 } else if(id == 0x1D) {
1018                     stlink_read_unsupported_reg(sl, id, &regp);
1019                     myreg = htonl(regp.faultmask);
1020                 } else if(id == 0x1E) {
1021                     stlink_read_unsupported_reg(sl, id, &regp);
1022                     myreg = htonl(regp.basepri);
1023                 } else if(id == 0x1F) {
1024                     stlink_read_unsupported_reg(sl, id, &regp);
1025                     myreg = htonl(regp.primask);
1026                 } else if(id >= 0x20 && id < 0x40) {
1027                     stlink_read_unsupported_reg(sl, id, &regp);
1028                     myreg = htonl(regp.s[id-0x20]);
1029                 } else if(id == 0x40) {
1030                     stlink_read_unsupported_reg(sl, id, &regp);
1031                     myreg = htonl(regp.fpscr);
1032                 } else {
1033                     reply = strdup("E00");
1034                 }
1035
1036                 reply = calloc(8 + 1, 1);
1037                 sprintf(reply, "%08x", myreg);
1038
1039                 break;
1040             }
1041
1042             case 'P': {
1043                 char* s_reg = &packet[1];
1044                 char* s_value = strstr(&packet[1], "=") + 1;
1045
1046                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1047                 unsigned value = strtoul(s_value, NULL, 16);
1048
1049                 if(reg < 16) {
1050                     stlink_write_reg(sl, ntohl(value), reg);
1051                 } else if(reg == 0x19) {
1052                     stlink_write_reg(sl, ntohl(value), 16);
1053                 } else if(reg == 0x1A) {
1054                     stlink_write_reg(sl, ntohl(value), 17);
1055                 } else if(reg == 0x1B) {
1056                     stlink_write_reg(sl, ntohl(value), 18);
1057                 } else if(reg == 0x1C) {
1058                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1059                 } else if(reg == 0x1D) {
1060                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1061                 } else if(reg == 0x1E) {
1062                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1063                 } else if(reg == 0x1F) {
1064                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1065                 } else if(reg >= 0x20 && reg < 0x40) {
1066                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1067                 } else if(reg == 0x40) {
1068                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1069                 } else {
1070                     reply = strdup("E00");
1071                 }
1072
1073                 if(!reply) {
1074                     reply = strdup("OK");
1075                 }
1076
1077                 break;
1078             }
1079
1080             case 'G':
1081                 for(int i = 0; i < 16; i++) {
1082                     char str[9] = {0};
1083                     strncpy(str, &packet[1 + i * 8], 8);
1084                     uint32_t reg = strtoul(str, NULL, 16);
1085                     stlink_write_reg(sl, ntohl(reg), i);
1086                 }
1087
1088                 reply = strdup("OK");
1089                 break;
1090
1091             case 'm': {
1092                 char* s_start = &packet[1];
1093                 char* s_count = strstr(&packet[1], ",") + 1;
1094
1095                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1096                 unsigned     count = strtoul(s_count, NULL, 16);
1097
1098                 unsigned adj_start = start % 4;
1099                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1100
1101                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1102
1103                 reply = calloc(count * 2 + 1, 1);
1104                 for(unsigned int i = 0; i < count; i++) {
1105                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1106                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1107                 }
1108
1109                 break;
1110             }
1111
1112             case 'M': {
1113                 char* s_start = &packet[1];
1114                 char* s_count = strstr(&packet[1], ",") + 1;
1115                 char* hexdata = strstr(packet, ":") + 1;
1116
1117                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1118                 unsigned     count = strtoul(s_count, NULL, 16);
1119
1120                 if(start % 4) {
1121                     unsigned align_count = 4 - start % 4;
1122                     if (align_count > count) align_count = count;
1123                     for(unsigned int i = 0; i < align_count; i ++) {
1124                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1125                         uint8_t byte = strtoul(hex, NULL, 16);
1126                         sl->q_buf[i] = byte;
1127                     }
1128                     stlink_write_mem8(sl, start, align_count);
1129                     start += align_count;
1130                     count -= align_count;
1131                     hexdata += 2*align_count;
1132                 }
1133
1134                 if(count - count % 4) {
1135                     unsigned aligned_count = count - count % 4;
1136
1137                     for(unsigned int i = 0; i < aligned_count; i ++) {
1138                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1139                         uint8_t byte = strtoul(hex, NULL, 16);
1140                         sl->q_buf[i] = byte;
1141                     }
1142                     stlink_write_mem32(sl, start, aligned_count);
1143                     count -= aligned_count;
1144                     start += aligned_count;
1145                     hexdata += 2*aligned_count;
1146                 }
1147
1148                 if(count) {
1149                     for(unsigned int i = 0; i < count; i ++) {
1150                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1151                         uint8_t byte = strtoul(hex, NULL, 16);
1152                         sl->q_buf[i] = byte;
1153                     }
1154                     stlink_write_mem8(sl, start, count);
1155                 }
1156                 reply = strdup("OK");
1157                 break;
1158             }
1159
1160             case 'Z': {
1161                 char *endptr;
1162                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1163                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1164
1165                 switch (packet[1]) {
1166                     case '1':
1167                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1168                             reply = strdup("E00");
1169                         } else {
1170                             reply = strdup("OK");
1171                         }
1172                         break;
1173
1174                     case '2':   // insert write watchpoint
1175                     case '3':   // insert read  watchpoint
1176                     case '4': { // insert access watchpoint
1177                         enum watchfun wf;
1178                         if(packet[1] == '2') {
1179                             wf = WATCHWRITE;
1180                         } else if(packet[1] == '3') {
1181                             wf = WATCHREAD;
1182                         } else {
1183                             wf = WATCHACCESS;
1184                         }
1185
1186                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1187                             reply = strdup("E00");
1188                         } else {
1189                             reply = strdup("OK");
1190                             break;
1191                         }
1192                     }
1193
1194                     default:
1195                         reply = strdup("");
1196                 }
1197                 break;
1198             }
1199             case 'z': {
1200                 char *endptr;
1201                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1202                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1203
1204                 switch (packet[1]) {
1205                     case '1': // remove breakpoint
1206                         update_code_breakpoint(sl, addr, 0);
1207                         reply = strdup("OK");
1208                         break;
1209
1210                     case '2' : // remove write watchpoint
1211                     case '3' : // remove read watchpoint
1212                     case '4' : // remove access watchpoint
1213                         if(delete_data_watchpoint(sl, addr) < 0) {
1214                             reply = strdup("E00");
1215                         } else {
1216                             reply = strdup("OK");
1217                             break;
1218                         }
1219
1220                     default:
1221                         reply = strdup("");
1222                 }
1223                 break;
1224             }
1225
1226             case '!': {
1227                 /*
1228                  * Enter extended mode which allows restarting.
1229                  * We do support that always.
1230                  */
1231
1232                 /*
1233                  * Also, set to persistent mode
1234                  * to allow GDB disconnect.
1235                  */
1236                 st->persistent = 1;
1237
1238                 reply = strdup("OK");
1239
1240                 break;
1241             }
1242
1243             case 'R': {
1244                 /* Reset the core. */
1245
1246                 stlink_reset(sl);
1247                 init_code_breakpoints(sl);
1248                 init_data_watchpoints(sl);
1249
1250                 attached = 1;
1251
1252                 reply = strdup("OK");
1253
1254                 break;
1255             }
1256
1257             default:
1258                 reply = strdup("");
1259         }
1260
1261         if(reply) {
1262             DLOG("send: %s\n", reply);
1263
1264             int result = gdb_send_packet(client, reply);
1265             if(result != 0) {
1266                 ELOG("cannot send: %d\n", result);
1267                 free(reply);
1268                 free(packet);
1269 #ifdef __MINGW32__
1270                 win32_close_socket(sock);
1271 #endif
1272                 return 1;
1273             }
1274
1275             free(reply);
1276         }
1277
1278         free(packet);
1279     }
1280
1281 #ifdef __MINGW32__
1282     win32_close_socket(sock);
1283 #endif
1284
1285     return 0;
1286 }