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=\"0x40000\"/>"      // sram
 329     "  <memory type=\"ram\" start=\"0x60000000\" length=\"0x10000000\"/>"   // fmc bank 1 (nor/psram/sram)
 330     "  <memory type=\"ram\" start=\"0x70000000\" length=\"0x20000000\"/>"   // fmc bank 2 & 3 (nand flash)
 331     "  <memory type=\"ram\" start=\"0x90000000\" length=\"0x10000000\"/>"   // fmc bank 4 (pc card)
 332     "  <memory type=\"ram\" start=\"0xC0000000\" length=\"0x20000000\"/>"   // fmc sdram bank 1 & 2
 333     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 334     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 335     "  </memory>"
 336     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 337     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 338     "  </memory>"
 339     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0xE0000\">"     //Sectors 5..11
 340     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 341     "  </memory>"
 342     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 343     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 344     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 345     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 346     "</memory-map>";
 347
 348 static const char* const memory_map_template_F2 =
 349     "<?xml version=\"1.0\"?>"
 350     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 351     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 352     "<memory-map>"
 353     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 354     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram
 355     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 356     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 357     "  </memory>"
 358     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 359     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 360     "  </memory>"
 361     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x%zx\">"       //Sectors 5..
 362     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 363     "  </memory>"
 364     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 365     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 366     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 367     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 368     "</memory-map>";
 369
 370 static const char* const memory_map_template =
 371     "<?xml version=\"1.0\"?>"
 372     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 373     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 374     "<memory-map>"
 375     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 376     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram 8k
 377     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 378     "    <property name=\"blocksize\">0x%zx</property>"
 379     "  </memory>"
 380     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 381     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 382     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 383     "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"         // option byte area
 384     "</memory-map>";
 385
 386 char* make_memory_map(stlink_t *sl) {
 387     /* This will be freed in serve() */
 388     char* map = malloc(4096);
 389     map[0] = '\0';
 390
 391     if(sl->chip_id==STM32_CHIPID_F4) {
 392         strcpy(map, memory_map_template_F4);
 393     } else if(sl->chip_id==STM32_CHIPID_F4_HD) {
 394         strcpy(map, memory_map_template_F4_HD);
 395     } else if(sl->chip_id==STM32_CHIPID_F2) {
 396         snprintf(map, 4096, memory_map_template_F2,
 397                 sl->flash_size,
 398                 sl->sram_size,
 399                 sl->flash_size - 0x20000,
 400                 sl->sys_base, sl->sys_size);
 401     } else {
 402         snprintf(map, 4096, memory_map_template,
 403                 sl->flash_size,
 404                 sl->sram_size,
 405                 sl->flash_size, sl->flash_pgsz,
 406                 sl->sys_base, sl->sys_size);
 407     }
 408     return map;
 409 }
 410
 411
 412 /*
 413  * DWT_COMP0     0xE0001020
 414  * DWT_MASK0     0xE0001024
 415  * DWT_FUNCTION0 0xE0001028
 416  * DWT_COMP1     0xE0001030
 417  * DWT_MASK1     0xE0001034
 418  * DWT_FUNCTION1 0xE0001038
 419  * DWT_COMP2     0xE0001040
 420  * DWT_MASK2     0xE0001044
 421  * DWT_FUNCTION2 0xE0001048
 422  * DWT_COMP3     0xE0001050
 423  * DWT_MASK3     0xE0001054
 424  * DWT_FUNCTION3 0xE0001058
 425  */
 426
 427 #define DATA_WATCH_NUM 4
 428
 429 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 430
 431 struct code_hw_watchpoint {
 432     stm32_addr_t addr;
 433     uint8_t mask;
 434     enum watchfun fun;
 435 };
 436
 437 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 438
 439 static void init_data_watchpoints(stlink_t *sl) {
 440     DLOG("init watchpoints\n");
 441
 442     // set trcena in debug command to turn on dwt unit
 443     stlink_write_debug32(sl, 0xE000EDFC,
 444             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 445
 446     // make sure all watchpoints are cleared
 447     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 448         data_watches[i].fun = WATCHDISABLED;
 449         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 450     }
 451 }
 452
 453 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 454                                stm32_addr_t addr, unsigned int len) {
 455     int i = 0;
 456     uint32_t mask;
 457
 458     // computer mask
 459     // find a free watchpoint
 460     // configure
 461
 462     mask = -1;
 463     i = len;
 464     while(i) {
 465         i >>= 1;
 466         mask++;
 467     }
 468
 469     if((mask != (uint32_t)-1) && (mask < 16)) {
 470         for(i = 0; i < DATA_WATCH_NUM; i++) {
 471             // is this an empty slot ?
 472             if(data_watches[i].fun == WATCHDISABLED) {
 473                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 474
 475                 data_watches[i].fun = wf;
 476                 data_watches[i].addr = addr;
 477                 data_watches[i].mask = mask;
 478
 479                 // insert comparator address
 480                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 481
 482                 // insert mask
 483                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 484
 485                 // insert function
 486                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 487
 488                 // just to make sure the matched bit is clear !
 489                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 490                 return 0;
 491             }
 492         }
 493     }
 494
 495     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 496     return -1;
 497 }
 498
 499 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 500 {
 501     int i;
 502
 503     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 504         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 505             DLOG("delete watchpoint %d addr %x\n", i, addr);
 506
 507             data_watches[i].fun = WATCHDISABLED;
 508             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 509
 510             return 0;
 511         }
 512     }
 513
 514     DLOG("failure: delete watchpoint addr %x\n", addr);
 515
 516     return -1;
 517 }
 518
 519 #define CODE_BREAK_NUM  6
 520 #define CODE_LIT_NUM    2
 521 #define CODE_BREAK_LOW  0x01
 522 #define CODE_BREAK_HIGH 0x02
 523
 524 struct code_hw_breakpoint {
 525     stm32_addr_t addr;
 526     int          type;
 527 };
 528
 529 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 530
 531 static void init_code_breakpoints(stlink_t *sl) {
 532     memset(sl->q_buf, 0, 4);
 533     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 534     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 535     if (((val & 3) != 1) ||
 536             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 537             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 538         ELOG("[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 539                 ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 540     }
 541
 542
 543     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 544         code_breaks[i].type = 0;
 545         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 546     }
 547 }
 548
 549 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 550     stm32_addr_t fpb_addr = addr & ~0x3;
 551     int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 552
 553     if(addr & 1) {
 554         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 555         return -1;
 556     }
 557
 558     int id = -1;
 559     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 560         if(fpb_addr == code_breaks[i].addr ||
 561                 (set && code_breaks[i].type == 0)) {
 562             id = i;
 563             break;
 564         }
 565     }
 566
 567     if(id == -1) {
 568         if(set) return -1; // Free slot not found
 569         else    return 0;  // Breakpoint is already removed
 570     }
 571
 572     struct code_hw_breakpoint* brk = &code_breaks[id];
 573
 574     brk->addr = fpb_addr;
 575
 576     if(set) brk->type |= type;
 577     else        brk->type &= ~type;
 578
 579     if(brk->type == 0) {
 580         DLOG("clearing hw break %d\n", id);
 581
 582         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 583     } else {
 584         uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 585
 586         DLOG("setting hw break %d at %08x (%d)\n",
 587                     id, brk->addr, brk->type);
 588         DLOG("reg %08x \n",
 589                     mask);
 590
 591         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 592     }
 593
 594     return 0;
 595 }
 596
 597
 598 struct flash_block {
 599     stm32_addr_t addr;
 600     unsigned     length;
 601     uint8_t*     data;
 602
 603     struct flash_block* next;
 604 };
 605
 606 static struct flash_block* flash_root;
 607
 608 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 609
 610     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 611         ELOG("flash_add_block: incorrect bounds\n");
 612         return -1;
 613     }
 614
 615     stlink_calculate_pagesize(sl, addr);
 616     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 617         ELOG("flash_add_block: unaligned block\n");
 618         return -1;
 619     }
 620
 621     struct flash_block* new = malloc(sizeof(struct flash_block));
 622     new->next = flash_root;
 623
 624     new->addr   = addr;
 625     new->length = length;
 626     new->data   = calloc(length, 1);
 627
 628     flash_root = new;
 629
 630     return 0;
 631 }
 632
 633 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 634     unsigned int fit_blocks = 0, fit_length = 0;
 635
 636     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 637         /* Block: ------X------Y--------
 638          * Data:            a-----b
 639          *                a--b
 640          *            a-----------b
 641          * Block intersects with data, if:
 642          *  a < Y && b > x
 643          */
 644
 645         unsigned X = fb->addr, Y = fb->addr + fb->length;
 646         unsigned a = addr, b = addr + length;
 647         if(a < Y && b > X) {
 648             // from start of the block
 649             unsigned start = (a > X ? a : X) - X;
 650             unsigned end   = (b > Y ? Y : b) - X;
 651
 652             memcpy(fb->data + start, data, end - start);
 653
 654             fit_blocks++;
 655             fit_length += end - start;
 656         }
 657     }
 658
 659     if(fit_blocks == 0) {
 660         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 661         return -1;
 662     }
 663
 664     if(fit_length != length) {
 665         WLOG("data block %08x -> %04x truncated to %04x\n",
 666                 addr, length, fit_length);
 667         WLOG("(this is not an error, just a GDB glitch)\n");
 668     }
 669
 670     return 0;
 671 }
 672
 673 static int flash_go(stlink_t *sl) {
 674     int error = -1;
 675
 676     // Some kinds of clock settings do not allow writing to flash.
 677     stlink_reset(sl);
 678
 679     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 680         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 681
 682         unsigned length = fb->length;
 683         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 684
 685             //Update FLASH_PAGE
 686             stlink_calculate_pagesize(sl, page);
 687
 688             DLOG("flash_do: page %08x\n", page);
 689
 690             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 691                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 692                 goto error;
 693         }
 694     }
 695
 696     stlink_reset(sl);
 697
 698     error = 0;
 699
 700 error:
 701     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 702         next = fb->next;
 703         free(fb->data);
 704         free(fb);
 705     }
 706
 707     flash_root = NULL;
 708
 709     return error;
 710 }
 711
 712 int serve(stlink_t *sl, st_state_t *st) {
 713     int sock = socket(AF_INET, SOCK_STREAM, 0);
 714     if(sock < 0) {
 715         perror("socket");
 716         return 1;
 717     }
 718
 719     unsigned int val = 1;
 720     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 721
 722     struct sockaddr_in serv_addr;
 723     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 724     serv_addr.sin_family = AF_INET;
 725     serv_addr.sin_addr.s_addr = INADDR_ANY;
 726     serv_addr.sin_port = htons(st->listen_port);
 727
 728     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 729         perror("bind");
 730         return 1;
 731     }
 732
 733     if(listen(sock, 5) < 0) {
 734         perror("listen");
 735         return 1;
 736     }
 737
 738     ILOG("Listening at *:%d...\n", st->listen_port);
 739
 740     int client = accept(sock, NULL, NULL);
 741     //signal (SIGINT, SIG_DFL);
 742     if(client < 0) {
 743         perror("accept");
 744         return 1;
 745     }
 746
 747     close(sock);
 748
 749     stlink_force_debug(sl);
 750     if (st->reset) {
 751         stlink_reset(sl);
 752     }
 753     init_code_breakpoints(sl);
 754     init_data_watchpoints(sl);
 755
 756     ILOG("GDB connected.\n");
 757
 758     /*
 759      * To allow resetting the chip from GDB it is required to
 760      * emulate attaching and detaching to target.
 761      */
 762     unsigned int attached = 1;
 763
 764     while(1) {
 765         char* packet;
 766
 767         int status = gdb_recv_packet(client, &packet);
 768         if(status < 0) {
 769             ELOG("cannot recv: %d\n", status);
 770 #ifdef __MINGW32__
 771             win32_close_socket(sock);
 772 #endif
 773             return 1;
 774         }
 775
 776         DLOG("recv: %s\n", packet);
 777
 778         char* reply = NULL;
 779         reg regp;
 780
 781         switch(packet[0]) {
 782             case 'q': {
 783                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 784                     reply = strdup("");
 785                     break;
 786                 }
 787
 788                 char *separator = strstr(packet, ":"), *params = "";
 789                 if(separator == NULL) {
 790                     separator = packet + strlen(packet);
 791                 } else {
 792                     params = separator + 1;
 793                 }
 794
 795                 unsigned queryNameLength = (separator - &packet[1]);
 796                 char* queryName = calloc(queryNameLength + 1, 1);
 797                 strncpy(queryName, &packet[1], queryNameLength);
 798
 799                 DLOG("query: %s;%s\n", queryName, params);
 800
 801                 if(!strcmp(queryName, "Supported")) {
 802                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 803                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 804                     }
 805                     else {
 806                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 807                     }
 808                 } else if(!strcmp(queryName, "Xfer")) {
 809                     char *type, *op, *__s_addr, *s_length;
 810                     char *tok = params;
 811                     char *annex __attribute__((unused));
 812
 813                     type     = strsep(&tok, ":");
 814                     op       = strsep(&tok, ":");
 815                     annex    = strsep(&tok, ":");
 816                     __s_addr   = strsep(&tok, ",");
 817                     s_length = tok;
 818
 819                     unsigned addr = strtoul(__s_addr, NULL, 16),
 820                              length = strtoul(s_length, NULL, 16);
 821
 822                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 823                                 type, op, annex, addr, length);
 824
 825                     const char* data = NULL;
 826
 827                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 828                         data = current_memory_map;
 829
 830                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 831                         data = target_description_F4;
 832
 833                     if(data) {
 834                         unsigned data_length = strlen(data);
 835                         if(addr + length > data_length)
 836                             length = data_length - addr;
 837
 838                         if(length == 0) {
 839                             reply = strdup("l");
 840                         } else {
 841                             reply = calloc(length + 2, 1);
 842                             reply[0] = 'm';
 843                             strncpy(&reply[1], data, length);
 844                         }
 845                     }
 846                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 847                     // Rcmd uses the wrong separator
 848                     char *separator = strstr(packet, ","), *params = "";
 849                     if(separator == NULL) {
 850                         separator = packet + strlen(packet);
 851                     } else {
 852                         params = separator + 1;
 853                     }
 854
 855
 856                     if (!strncmp(params,"726573756d65",12)) {// resume
 857                         DLOG("Rcmd: resume\n");
 858                         stlink_run(sl);
 859
 860                         reply = strdup("OK");
 861                     } else if (!strncmp(params,"68616c74",8)) { //halt
 862                         reply = strdup("OK");
 863
 864                         stlink_force_debug(sl);
 865
 866                         DLOG("Rcmd: halt\n");
 867                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 868                         reply = strdup("OK");
 869
 870                         stlink_jtag_reset(sl, 0);
 871                         stlink_jtag_reset(sl, 1);
 872                         stlink_force_debug(sl);
 873
 874                         DLOG("Rcmd: jtag_reset\n");
 875                     } else if (!strncmp(params,"7265736574",10)) { //reset
 876                         reply = strdup("OK");
 877
 878                         stlink_force_debug(sl);
 879                         stlink_reset(sl);
 880                         init_code_breakpoints(sl);
 881                         init_data_watchpoints(sl);
 882
 883                         DLOG("Rcmd: reset\n");
 884                     } else {
 885                         DLOG("Rcmd: %s\n", params);
 886                     }
 887
 888                 }
 889
 890                 if(reply == NULL)
 891                     reply = strdup("");
 892
 893                 free(queryName);
 894
 895                 break;
 896             }
 897
 898             case 'v': {
 899                 char *params = NULL;
 900                 char *cmdName = strtok_r(packet, ":;", &params);
 901
 902                 cmdName++; // vCommand -> Command
 903
 904                 if(!strcmp(cmdName, "FlashErase")) {
 905                     char *__s_addr, *s_length;
 906                     char *tok = params;
 907
 908                     __s_addr   = strsep(&tok, ",");
 909                     s_length = tok;
 910
 911                     unsigned addr = strtoul(__s_addr, NULL, 16),
 912                              length = strtoul(s_length, NULL, 16);
 913
 914                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 915                                 addr, length);
 916
 917                     if(flash_add_block(addr, length, sl) < 0) {
 918                         reply = strdup("E00");
 919                     } else {
 920                         reply = strdup("OK");
 921                     }
 922                 } else if(!strcmp(cmdName, "FlashWrite")) {
 923                     char *__s_addr, *data;
 924                     char *tok = params;
 925
 926                     __s_addr = strsep(&tok, ":");
 927                     data   = tok;
 928
 929                     unsigned addr = strtoul(__s_addr, NULL, 16);
 930                     unsigned data_length = status - (data - packet);
 931
 932                     // Length of decoded data cannot be more than
 933                     // encoded, as escapes are removed.
 934                     // Additional byte is reserved for alignment fix.
 935                     uint8_t *decoded = calloc(data_length + 1, 1);
 936                     unsigned dec_index = 0;
 937                     for(unsigned int i = 0; i < data_length; i++) {
 938                         if(data[i] == 0x7d) {
 939                             i++;
 940                             decoded[dec_index++] = data[i] ^ 0x20;
 941                         } else {
 942                             decoded[dec_index++] = data[i];
 943                         }
 944                     }
 945
 946                     // Fix alignment
 947                     if(dec_index % 2 != 0)
 948                         dec_index++;
 949
 950                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 951
 952                     if(flash_populate(addr, decoded, dec_index) < 0) {
 953                         reply = strdup("E00");
 954                     } else {
 955                         reply = strdup("OK");
 956                     }
 957                 } else if(!strcmp(cmdName, "FlashDone")) {
 958                     if(flash_go(sl) < 0) {
 959                         reply = strdup("E00");
 960                     } else {
 961                         reply = strdup("OK");
 962                     }
 963                 } else if(!strcmp(cmdName, "Kill")) {
 964                     attached = 0;
 965
 966                     reply = strdup("OK");
 967                 }
 968
 969                 if(reply == NULL)
 970                     reply = strdup("");
 971
 972                 break;
 973             }
 974
 975             case 'c':
 976                 stlink_run(sl);
 977
 978                 while(1) {
 979                     int status = gdb_check_for_interrupt(client);
 980                     if(status < 0) {
 981                         ELOG("cannot check for int: %d\n", status);
 982 #ifdef __MINGW32__
 983                         win32_close_socket(sock);
 984 #endif
 985                         return 1;
 986                     }
 987
 988                     if(status == 1) {
 989                         stlink_force_debug(sl);
 990                         break;
 991                     }
 992
 993                     stlink_status(sl);
 994                     if(sl->core_stat == STLINK_CORE_HALTED) {
 995                         break;
 996                     }
 997
 998                     usleep(100000);
 999                 }
1000
1001                 reply = strdup("S05"); // TRAP
1002                 break;
1003
1004             case 's':
1005                 stlink_step(sl);
1006
1007                 reply = strdup("S05"); // TRAP
1008                 break;
1009
1010             case '?':
1011                 if(attached) {
1012                     reply = strdup("S05"); // TRAP
1013                 } else {
1014                     /* Stub shall reply OK if not attached. */
1015                     reply = strdup("OK");
1016                 }
1017                 break;
1018
1019             case 'g':
1020                 stlink_read_all_regs(sl, &regp);
1021
1022                 reply = calloc(8 * 16 + 1, 1);
1023                 for(int i = 0; i < 16; i++)
1024                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
1025
1026                 break;
1027
1028             case 'p': {
1029                 unsigned id = strtoul(&packet[1], NULL, 16);
1030                 unsigned myreg = 0xDEADDEAD;
1031
1032                 if(id < 16) {
1033                     stlink_read_reg(sl, id, &regp);
1034                     myreg = htonl(regp.r[id]);
1035                 } else if(id == 0x19) {
1036                     stlink_read_reg(sl, 16, &regp);
1037                     myreg = htonl(regp.xpsr);
1038                 } else if(id == 0x1A) {
1039                     stlink_read_reg(sl, 17, &regp);
1040                     myreg = htonl(regp.main_sp);
1041                 } else if(id == 0x1B) {
1042                     stlink_read_reg(sl, 18, &regp);
1043                     myreg = htonl(regp.process_sp);
1044                 } else if(id == 0x1C) {
1045                     stlink_read_unsupported_reg(sl, id, &regp);
1046                     myreg = htonl(regp.control);
1047                 } else if(id == 0x1D) {
1048                     stlink_read_unsupported_reg(sl, id, &regp);
1049                     myreg = htonl(regp.faultmask);
1050                 } else if(id == 0x1E) {
1051                     stlink_read_unsupported_reg(sl, id, &regp);
1052                     myreg = htonl(regp.basepri);
1053                 } else if(id == 0x1F) {
1054                     stlink_read_unsupported_reg(sl, id, &regp);
1055                     myreg = htonl(regp.primask);
1056                 } else if(id >= 0x20 && id < 0x40) {
1057                     stlink_read_unsupported_reg(sl, id, &regp);
1058                     myreg = htonl(regp.s[id-0x20]);
1059                 } else if(id == 0x40) {
1060                     stlink_read_unsupported_reg(sl, id, &regp);
1061                     myreg = htonl(regp.fpscr);
1062                 } else {
1063                     reply = strdup("E00");
1064                 }
1065
1066                 reply = calloc(8 + 1, 1);
1067                 sprintf(reply, "%08x", myreg);
1068
1069                 break;
1070             }
1071
1072             case 'P': {
1073                 char* s_reg = &packet[1];
1074                 char* s_value = strstr(&packet[1], "=") + 1;
1075
1076                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1077                 unsigned value = strtoul(s_value, NULL, 16);
1078
1079                 if(reg < 16) {
1080                     stlink_write_reg(sl, ntohl(value), reg);
1081                 } else if(reg == 0x19) {
1082                     stlink_write_reg(sl, ntohl(value), 16);
1083                 } else if(reg == 0x1A) {
1084                     stlink_write_reg(sl, ntohl(value), 17);
1085                 } else if(reg == 0x1B) {
1086                     stlink_write_reg(sl, ntohl(value), 18);
1087                 } else if(reg == 0x1C) {
1088                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1089                 } else if(reg == 0x1D) {
1090                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1091                 } else if(reg == 0x1E) {
1092                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1093                 } else if(reg == 0x1F) {
1094                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1095                 } else if(reg >= 0x20 && reg < 0x40) {
1096                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1097                 } else if(reg == 0x40) {
1098                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1099                 } else {
1100                     reply = strdup("E00");
1101                 }
1102
1103                 if(!reply) {
1104                     reply = strdup("OK");
1105                 }
1106
1107                 break;
1108             }
1109
1110             case 'G':
1111                 for(int i = 0; i < 16; i++) {
1112                     char str[9] = {0};
1113                     strncpy(str, &packet[1 + i * 8], 8);
1114                     uint32_t reg = strtoul(str, NULL, 16);
1115                     stlink_write_reg(sl, ntohl(reg), i);
1116                 }
1117
1118                 reply = strdup("OK");
1119                 break;
1120
1121             case 'm': {
1122                 char* s_start = &packet[1];
1123                 char* s_count = strstr(&packet[1], ",") + 1;
1124
1125                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1126                 unsigned     count = strtoul(s_count, NULL, 16);
1127
1128                 unsigned adj_start = start % 4;
1129                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1130
1131                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1132
1133                 reply = calloc(count * 2 + 1, 1);
1134                 for(unsigned int i = 0; i < count; i++) {
1135                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1136                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1137                 }
1138
1139                 break;
1140             }
1141
1142             case 'M': {
1143                 char* s_start = &packet[1];
1144                 char* s_count = strstr(&packet[1], ",") + 1;
1145                 char* hexdata = strstr(packet, ":") + 1;
1146
1147                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1148                 unsigned     count = strtoul(s_count, NULL, 16);
1149
1150                 if(start % 4) {
1151                     unsigned align_count = 4 - start % 4;
1152                     if (align_count > count) align_count = count;
1153                     for(unsigned int i = 0; i < align_count; i ++) {
1154                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1155                         uint8_t byte = strtoul(hex, NULL, 16);
1156                         sl->q_buf[i] = byte;
1157                     }
1158                     stlink_write_mem8(sl, start, align_count);
1159                     start += align_count;
1160                     count -= align_count;
1161                     hexdata += 2*align_count;
1162                 }
1163
1164                 if(count - count % 4) {
1165                     unsigned aligned_count = count - count % 4;
1166
1167                     for(unsigned int i = 0; i < aligned_count; i ++) {
1168                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1169                         uint8_t byte = strtoul(hex, NULL, 16);
1170                         sl->q_buf[i] = byte;
1171                     }
1172                     stlink_write_mem32(sl, start, aligned_count);
1173                     count -= aligned_count;
1174                     start += aligned_count;
1175                     hexdata += 2*aligned_count;
1176                 }
1177
1178                 if(count) {
1179                     for(unsigned int i = 0; i < count; i ++) {
1180                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1181                         uint8_t byte = strtoul(hex, NULL, 16);
1182                         sl->q_buf[i] = byte;
1183                     }
1184                     stlink_write_mem8(sl, start, count);
1185                 }
1186                 reply = strdup("OK");
1187                 break;
1188             }
1189
1190             case 'Z': {
1191                 char *endptr;
1192                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1193                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1194
1195                 switch (packet[1]) {
1196                     case '1':
1197                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1198                             reply = strdup("E00");
1199                         } else {
1200                             reply = strdup("OK");
1201                         }
1202                         break;
1203
1204                     case '2':   // insert write watchpoint
1205                     case '3':   // insert read  watchpoint
1206                     case '4': { // insert access watchpoint
1207                         enum watchfun wf;
1208                         if(packet[1] == '2') {
1209                             wf = WATCHWRITE;
1210                         } else if(packet[1] == '3') {
1211                             wf = WATCHREAD;
1212                         } else {
1213                             wf = WATCHACCESS;
1214                         }
1215
1216                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1217                             reply = strdup("E00");
1218                         } else {
1219                             reply = strdup("OK");
1220                             break;
1221                         }
1222                     }
1223
1224                     default:
1225                         reply = strdup("");
1226                 }
1227                 break;
1228             }
1229             case 'z': {
1230                 char *endptr;
1231                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1232                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1233
1234                 switch (packet[1]) {
1235                     case '1': // remove breakpoint
1236                         update_code_breakpoint(sl, addr, 0);
1237                         reply = strdup("OK");
1238                         break;
1239
1240                     case '2' : // remove write watchpoint
1241                     case '3' : // remove read watchpoint
1242                     case '4' : // remove access watchpoint
1243                         if(delete_data_watchpoint(sl, addr) < 0) {
1244                             reply = strdup("E00");
1245                         } else {
1246                             reply = strdup("OK");
1247                             break;
1248                         }
1249
1250                     default:
1251                         reply = strdup("");
1252                 }
1253                 break;
1254             }
1255
1256             case '!': {
1257                 /*
1258                  * Enter extended mode which allows restarting.
1259                  * We do support that always.
1260                  */
1261
1262                 /*
1263                  * Also, set to persistent mode
1264                  * to allow GDB disconnect.
1265                  */
1266                 st->persistent = 1;
1267
1268                 reply = strdup("OK");
1269
1270                 break;
1271             }
1272
1273             case 'R': {
1274                 /* Reset the core. */
1275
1276                 stlink_reset(sl);
1277                 init_code_breakpoints(sl);
1278                 init_data_watchpoints(sl);
1279
1280                 attached = 1;
1281
1282                 reply = strdup("OK");
1283
1284                 break;
1285             }
1286
1287             default:
1288                 reply = strdup("");
1289         }
1290
1291         if(reply) {
1292             DLOG("send: %s\n", reply);
1293
1294             int result = gdb_send_packet(client, reply);
1295             if(result != 0) {
1296                 ELOG("cannot send: %d\n", result);
1297                 free(reply);
1298                 free(packet);
1299 #ifdef __MINGW32__
1300                 win32_close_socket(sock);
1301 #endif
1302                 return 1;
1303             }
1304
1305             free(reply);
1306         }
1307
1308         free(packet);
1309     }
1310
1311 #ifdef __MINGW32__
1312     win32_close_socket(sock);
1313 #endif
1314
1315     return 0;
1316 }