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 static const char* const memory_map_template_F7 =
 387     "<?xml version=\"1.0\"?>"
 388     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 389     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 390     "<memory-map>"
 391     "  <memory type=\"ram\" start=\"0x00000000\" length=\"0x4000\"/>"       // ITCM ram 16kB
 392     "  <memory type=\"rom\" start=\"0x00200000\" length=\"0x100000\"/>"     // ITCM flash
 393     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x50000\"/>"      // sram
 394     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x20000\">"     // Sectors 0..3
 395     "    <property name=\"blocksize\">0x8000</property>"                    // 32kB
 396     "  </memory>"
 397     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x20000\">"     // Sector 4
 398     "    <property name=\"blocksize\">0x20000</property>"                   // 128kB
 399     "  </memory>"
 400     "  <memory type=\"flash\" start=\"0x08040000\" length=\"0xC0000\">"     // Sectors 5..7
 401     "    <property name=\"blocksize\">0x40000</property>"                   // 128kB
 402     "  </memory>"
 403     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 404     "  <memory type=\"ram\" start=\"0x60000000\" length=\"0x7fffffff\"/>"   // AHB3 Peripherals
 405     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 406     "  <memory type=\"rom\" start=\"0x00100000\" length=\"0xEDC0\"/>"       // bootrom
 407     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x20\"/>"         // option byte area
 408     "</memory-map>";
 409
 410 char* make_memory_map(stlink_t *sl) {
 411     /* This will be freed in serve() */
 412     char* map = malloc(4096);
 413     map[0] = '\0';
 414
 415     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F446) {
 416         strcpy(map, memory_map_template_F4);
 417     } else if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F7) {
 418         strcpy(map, memory_map_template_F7);
 419     } else if(sl->chip_id==STM32_CHIPID_F4_HD) {
 420         strcpy(map, memory_map_template_F4_HD);
 421     } else if(sl->chip_id==STM32_CHIPID_F2) {
 422         snprintf(map, 4096, memory_map_template_F2,
 423                 sl->flash_size,
 424                 sl->sram_size,
 425                 sl->flash_size - 0x20000,
 426                 sl->sys_base, sl->sys_size);
 427     } else {
 428         snprintf(map, 4096, memory_map_template,
 429                 sl->flash_size,
 430                 sl->sram_size,
 431                 sl->flash_size, sl->flash_pgsz,
 432                 sl->sys_base, sl->sys_size);
 433     }
 434     return map;
 435 }
 436
 437
 438 /*
 439  * DWT_COMP0     0xE0001020
 440  * DWT_MASK0     0xE0001024
 441  * DWT_FUNCTION0 0xE0001028
 442  * DWT_COMP1     0xE0001030
 443  * DWT_MASK1     0xE0001034
 444  * DWT_FUNCTION1 0xE0001038
 445  * DWT_COMP2     0xE0001040
 446  * DWT_MASK2     0xE0001044
 447  * DWT_FUNCTION2 0xE0001048
 448  * DWT_COMP3     0xE0001050
 449  * DWT_MASK3     0xE0001054
 450  * DWT_FUNCTION3 0xE0001058
 451  */
 452
 453 #define DATA_WATCH_NUM 4
 454
 455 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 456
 457 struct code_hw_watchpoint {
 458     stm32_addr_t addr;
 459     uint8_t mask;
 460     enum watchfun fun;
 461 };
 462
 463 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 464
 465 static void init_data_watchpoints(stlink_t *sl) {
 466     DLOG("init watchpoints\n");
 467
 468     // set trcena in debug command to turn on dwt unit
 469     stlink_write_debug32(sl, 0xE000EDFC,
 470             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 471
 472     // make sure all watchpoints are cleared
 473     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 474         data_watches[i].fun = WATCHDISABLED;
 475         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 476     }
 477 }
 478
 479 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 480                                stm32_addr_t addr, unsigned int len) {
 481     int i = 0;
 482     uint32_t mask;
 483
 484     // computer mask
 485     // find a free watchpoint
 486     // configure
 487
 488     mask = -1;
 489     i = len;
 490     while(i) {
 491         i >>= 1;
 492         mask++;
 493     }
 494
 495     if((mask != (uint32_t)-1) && (mask < 16)) {
 496         for(i = 0; i < DATA_WATCH_NUM; i++) {
 497             // is this an empty slot ?
 498             if(data_watches[i].fun == WATCHDISABLED) {
 499                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 500
 501                 data_watches[i].fun = wf;
 502                 data_watches[i].addr = addr;
 503                 data_watches[i].mask = mask;
 504
 505                 // insert comparator address
 506                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 507
 508                 // insert mask
 509                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 510
 511                 // insert function
 512                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 513
 514                 // just to make sure the matched bit is clear !
 515                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 516                 return 0;
 517             }
 518         }
 519     }
 520
 521     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 522     return -1;
 523 }
 524
 525 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 526 {
 527     int i;
 528
 529     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 530         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 531             DLOG("delete watchpoint %d addr %x\n", i, addr);
 532
 533             data_watches[i].fun = WATCHDISABLED;
 534             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 535
 536             return 0;
 537         }
 538     }
 539
 540     DLOG("failure: delete watchpoint addr %x\n", addr);
 541
 542     return -1;
 543 }
 544
 545 int code_break_num;
 546 int code_lit_num;
 547 #define CODE_BREAK_NUM_MAX      15
 548 #define CODE_BREAK_LOW  0x01
 549 #define CODE_BREAK_HIGH 0x02
 550
 551 struct code_hw_breakpoint {
 552     stm32_addr_t addr;
 553     int          type;
 554 };
 555
 556 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM_MAX];
 557
 558 static void init_code_breakpoints(stlink_t *sl) {
 559     memset(sl->q_buf, 0, 4);
 560     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 561     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 562     code_break_num = ((val >> 4) & 0xf);
 563     code_lit_num = ((val >> 8) & 0xf);
 564
 565     ILOG("Found %i hw breakpoint registers\n", code_break_num);
 566
 567     for(int i = 0; i < code_break_num; i++) {
 568         code_breaks[i].type = 0;
 569         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 570     }
 571 }
 572
 573 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 574     stm32_addr_t fpb_addr;
 575     uint32_t mask;
 576     int type = (addr & 0x2) ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 577
 578     if(addr & 1) {
 579         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 580         return -1;
 581     }
 582
 583         if (sl->chip_id==STM32_CHIPID_F7) {
 584                 fpb_addr = addr;
 585         } else {
 586                 fpb_addr = addr & ~0x3;
 587         }
 588
 589     int id = -1;
 590     for(int i = 0; i < code_break_num; i++) {
 591         if(fpb_addr == code_breaks[i].addr ||
 592                 (set && code_breaks[i].type == 0)) {
 593             id = i;
 594             break;
 595         }
 596     }
 597
 598     if(id == -1) {
 599         if(set) return -1; // Free slot not found
 600         else    return 0;  // Breakpoint is already removed
 601     }
 602
 603     struct code_hw_breakpoint* brk = &code_breaks[id];
 604
 605     brk->addr = fpb_addr;
 606
 607         if (sl->chip_id==STM32_CHIPID_F7) {
 608                 if(set) brk->type = type;
 609                 else    brk->type = 0;
 610
 611                 mask = (brk->addr) | 1;
 612         } else {
 613                 if(set) brk->type |= type;
 614                 else    brk->type &= ~type;
 615
 616                 mask = (brk->addr) | 1 | (brk->type << 30);
 617         }
 618
 619     if(brk->type == 0) {
 620         DLOG("clearing hw break %d\n", id);
 621
 622         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 623     } else {
 624         DLOG("setting hw break %d at %08x (%d)\n",
 625                     id, brk->addr, brk->type);
 626         DLOG("reg %08x \n",
 627                     mask);
 628
 629         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 630     }
 631
 632     return 0;
 633 }
 634
 635
 636 struct flash_block {
 637     stm32_addr_t addr;
 638     unsigned     length;
 639     uint8_t*     data;
 640
 641     struct flash_block* next;
 642 };
 643
 644 static struct flash_block* flash_root;
 645
 646 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 647
 648     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 649         ELOG("flash_add_block: incorrect bounds\n");
 650         return -1;
 651     }
 652
 653     stlink_calculate_pagesize(sl, addr);
 654     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 655         ELOG("flash_add_block: unaligned block\n");
 656         return -1;
 657     }
 658
 659     struct flash_block* new = malloc(sizeof(struct flash_block));
 660     new->next = flash_root;
 661
 662     new->addr   = addr;
 663     new->length = length;
 664     new->data   = calloc(length, 1);
 665
 666     flash_root = new;
 667
 668     return 0;
 669 }
 670
 671 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 672     unsigned int fit_blocks = 0, fit_length = 0;
 673
 674     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 675         /* Block: ------X------Y--------
 676          * Data:            a-----b
 677          *                a--b
 678          *            a-----------b
 679          * Block intersects with data, if:
 680          *  a < Y && b > x
 681          */
 682
 683         unsigned X = fb->addr, Y = fb->addr + fb->length;
 684         unsigned a = addr, b = addr + length;
 685         if(a < Y && b > X) {
 686             // from start of the block
 687             unsigned start = (a > X ? a : X) - X;
 688             unsigned end   = (b > Y ? Y : b) - X;
 689
 690             memcpy(fb->data + start, data, end - start);
 691
 692             fit_blocks++;
 693             fit_length += end - start;
 694         }
 695     }
 696
 697     if(fit_blocks == 0) {
 698         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 699         return -1;
 700     }
 701
 702     if(fit_length != length) {
 703         WLOG("data block %08x -> %04x truncated to %04x\n",
 704                 addr, length, fit_length);
 705         WLOG("(this is not an error, just a GDB glitch)\n");
 706     }
 707
 708     return 0;
 709 }
 710
 711 static int flash_go(stlink_t *sl) {
 712     int error = -1;
 713
 714     // Some kinds of clock settings do not allow writing to flash.
 715     stlink_reset(sl);
 716     stlink_force_debug(sl);
 717
 718     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 719         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 720
 721         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 722             unsigned length = fb->length - (page - fb->addr);
 723
 724             //Update FLASH_PAGE
 725             stlink_calculate_pagesize(sl, page);
 726
 727             DLOG("flash_do: page %08x\n", page);
 728             unsigned send = length > FLASH_PAGE ? FLASH_PAGE : length;
 729             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 730                         send) < 0)
 731                 goto error;
 732             length -= send;
 733
 734         }
 735     }
 736
 737     stlink_reset(sl);
 738
 739     error = 0;
 740
 741 error:
 742     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 743         next = fb->next;
 744         free(fb->data);
 745         free(fb);
 746     }
 747
 748     flash_root = NULL;
 749
 750     return error;
 751 }
 752
 753 int serve(stlink_t *sl, st_state_t *st) {
 754     int sock = socket(AF_INET, SOCK_STREAM, 0);
 755     if(sock < 0) {
 756         perror("socket");
 757         return 1;
 758     }
 759
 760     unsigned int val = 1;
 761     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 762
 763     struct sockaddr_in serv_addr;
 764     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 765     serv_addr.sin_family = AF_INET;
 766     serv_addr.sin_addr.s_addr = INADDR_ANY;
 767     serv_addr.sin_port = htons(st->listen_port);
 768
 769     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 770         perror("bind");
 771         return 1;
 772     }
 773
 774     if(listen(sock, 5) < 0) {
 775         perror("listen");
 776         return 1;
 777     }
 778
 779     ILOG("Listening at *:%d...\n", st->listen_port);
 780
 781     int client = accept(sock, NULL, NULL);
 782     //signal (SIGINT, SIG_DFL);
 783     if(client < 0) {
 784         perror("accept");
 785         return 1;
 786     }
 787
 788     close(sock);
 789
 790     stlink_force_debug(sl);
 791     if (st->reset) {
 792         stlink_reset(sl);
 793     }
 794     init_code_breakpoints(sl);
 795     init_data_watchpoints(sl);
 796
 797     ILOG("GDB connected.\n");
 798
 799     /*
 800      * To allow resetting the chip from GDB it is required to
 801      * emulate attaching and detaching to target.
 802      */
 803     unsigned int attached = 1;
 804
 805     while(1) {
 806         char* packet;
 807
 808         int status = gdb_recv_packet(client, &packet);
 809         if(status < 0) {
 810             ELOG("cannot recv: %d\n", status);
 811 #ifdef __MINGW32__
 812             win32_close_socket(sock);
 813 #endif
 814             return 1;
 815         }
 816
 817         DLOG("recv: %s\n", packet);
 818
 819         char* reply = NULL;
 820         reg regp;
 821
 822         switch(packet[0]) {
 823             case 'q': {
 824                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 825                     reply = strdup("");
 826                     break;
 827                 }
 828
 829                 char *separator = strstr(packet, ":"), *params = "";
 830                 if(separator == NULL) {
 831                     separator = packet + strlen(packet);
 832                 } else {
 833                     params = separator + 1;
 834                 }
 835
 836                 unsigned queryNameLength = (separator - &packet[1]);
 837                 char* queryName = calloc(queryNameLength + 1, 1);
 838                 strncpy(queryName, &packet[1], queryNameLength);
 839
 840                 DLOG("query: %s;%s\n", queryName, params);
 841
 842                 if(!strcmp(queryName, "Supported")) {
 843                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 844                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 845                     }
 846                     else {
 847                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 848                     }
 849                 } else if(!strcmp(queryName, "Xfer")) {
 850                     char *type, *op, *__s_addr, *s_length;
 851                     char *tok = params;
 852                     char *annex __attribute__((unused));
 853
 854                     type     = strsep(&tok, ":");
 855                     op       = strsep(&tok, ":");
 856                     annex    = strsep(&tok, ":");
 857                     __s_addr   = strsep(&tok, ",");
 858                     s_length = tok;
 859
 860                     unsigned addr = strtoul(__s_addr, NULL, 16),
 861                              length = strtoul(s_length, NULL, 16);
 862
 863                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 864                                 type, op, annex, addr, length);
 865
 866                     const char* data = NULL;
 867
 868                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 869                         data = current_memory_map;
 870
 871                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 872                         data = target_description_F4;
 873
 874                     if(data) {
 875                         unsigned data_length = strlen(data);
 876                         if(addr + length > data_length)
 877                             length = data_length - addr;
 878
 879                         if(length == 0) {
 880                             reply = strdup("l");
 881                         } else {
 882                             reply = calloc(length + 2, 1);
 883                             reply[0] = 'm';
 884                             strncpy(&reply[1], data, length);
 885                         }
 886                     }
 887                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 888                     // Rcmd uses the wrong separator
 889                     char *separator = strstr(packet, ","), *params = "";
 890                     if(separator == NULL) {
 891                         separator = packet + strlen(packet);
 892                     } else {
 893                         params = separator + 1;
 894                     }
 895
 896
 897                     if (!strncmp(params,"726573756d65",12)) {// resume
 898                         DLOG("Rcmd: resume\n");
 899                         stlink_run(sl);
 900
 901                         reply = strdup("OK");
 902                     } else if (!strncmp(params,"68616c74",8)) { //halt
 903                         reply = strdup("OK");
 904
 905                         stlink_force_debug(sl);
 906
 907                         DLOG("Rcmd: halt\n");
 908                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 909                         reply = strdup("OK");
 910
 911                         stlink_jtag_reset(sl, 0);
 912                         stlink_jtag_reset(sl, 1);
 913                         stlink_force_debug(sl);
 914
 915                         DLOG("Rcmd: jtag_reset\n");
 916                     } else if (!strncmp(params,"7265736574",10)) { //reset
 917                         reply = strdup("OK");
 918
 919                         stlink_force_debug(sl);
 920                         stlink_reset(sl);
 921                         init_code_breakpoints(sl);
 922                         init_data_watchpoints(sl);
 923
 924                         DLOG("Rcmd: reset\n");
 925                     } else {
 926                         DLOG("Rcmd: %s\n", params);
 927                     }
 928
 929                 }
 930
 931                 if(reply == NULL)
 932                     reply = strdup("");
 933
 934                 free(queryName);
 935
 936                 break;
 937             }
 938
 939             case 'v': {
 940                 char *params = NULL;
 941                 char *cmdName = strtok_r(packet, ":;", &params);
 942
 943                 cmdName++; // vCommand -> Command
 944
 945                 if(!strcmp(cmdName, "FlashErase")) {
 946                     char *__s_addr, *s_length;
 947                     char *tok = params;
 948
 949                     __s_addr   = strsep(&tok, ",");
 950                     s_length = tok;
 951
 952                     unsigned addr = strtoul(__s_addr, NULL, 16),
 953                              length = strtoul(s_length, NULL, 16);
 954
 955                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 956                                 addr, length);
 957
 958                     if(flash_add_block(addr, length, sl) < 0) {
 959                         reply = strdup("E00");
 960                     } else {
 961                         reply = strdup("OK");
 962                     }
 963                 } else if(!strcmp(cmdName, "FlashWrite")) {
 964                     char *__s_addr, *data;
 965                     char *tok = params;
 966
 967                     __s_addr = strsep(&tok, ":");
 968                     data   = tok;
 969
 970                     unsigned addr = strtoul(__s_addr, NULL, 16);
 971                     unsigned data_length = status - (data - packet);
 972
 973                     // Length of decoded data cannot be more than
 974                     // encoded, as escapes are removed.
 975                     // Additional byte is reserved for alignment fix.
 976                     uint8_t *decoded = calloc(data_length + 1, 1);
 977                     unsigned dec_index = 0;
 978                     for(unsigned int i = 0; i < data_length; i++) {
 979                         if(data[i] == 0x7d) {
 980                             i++;
 981                             decoded[dec_index++] = data[i] ^ 0x20;
 982                         } else {
 983                             decoded[dec_index++] = data[i];
 984                         }
 985                     }
 986
 987                     // Fix alignment
 988                     if(dec_index % 2 != 0)
 989                         dec_index++;
 990
 991                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 992
 993                     if(flash_populate(addr, decoded, dec_index) < 0) {
 994                         reply = strdup("E00");
 995                     } else {
 996                         reply = strdup("OK");
 997                     }
 998                 } else if(!strcmp(cmdName, "FlashDone")) {
 999                     if(flash_go(sl) < 0) {
1000                         reply = strdup("E00");
1001                     } else {
1002                         reply = strdup("OK");
1003                     }
1004                 } else if(!strcmp(cmdName, "Kill")) {
1005                     attached = 0;
1006
1007                     reply = strdup("OK");
1008                 }
1009
1010                 if(reply == NULL)
1011                     reply = strdup("");
1012
1013                 break;
1014             }
1015
1016             case 'c':
1017                 stlink_run(sl);
1018
1019                 while(1) {
1020                     int status = gdb_check_for_interrupt(client);
1021                     if(status < 0) {
1022                         ELOG("cannot check for int: %d\n", status);
1023 #ifdef __MINGW32__
1024                         win32_close_socket(sock);
1025 #endif
1026                         return 1;
1027                     }
1028
1029                     if(status == 1) {
1030                         stlink_force_debug(sl);
1031                         break;
1032                     }
1033
1034                     stlink_status(sl);
1035                     if(sl->core_stat == STLINK_CORE_HALTED) {
1036                         break;
1037                     }
1038
1039                     usleep(100000);
1040                 }
1041
1042                 reply = strdup("S05"); // TRAP
1043                 break;
1044
1045             case 's':
1046                 stlink_step(sl);
1047
1048                 reply = strdup("S05"); // TRAP
1049                 break;
1050
1051             case '?':
1052                 if(attached) {
1053                     reply = strdup("S05"); // TRAP
1054                 } else {
1055                     /* Stub shall reply OK if not attached. */
1056                     reply = strdup("OK");
1057                 }
1058                 break;
1059
1060             case 'g':
1061                 stlink_read_all_regs(sl, &regp);
1062
1063                 reply = calloc(8 * 16 + 1, 1);
1064                 for(int i = 0; i < 16; i++)
1065                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
1066
1067                 break;
1068
1069             case 'p': {
1070                 unsigned id = strtoul(&packet[1], NULL, 16);
1071                 unsigned myreg = 0xDEADDEAD;
1072
1073                 if(id < 16) {
1074                     stlink_read_reg(sl, id, &regp);
1075                     myreg = htonl(regp.r[id]);
1076                 } else if(id == 0x19) {
1077                     stlink_read_reg(sl, 16, &regp);
1078                     myreg = htonl(regp.xpsr);
1079                 } else if(id == 0x1A) {
1080                     stlink_read_reg(sl, 17, &regp);
1081                     myreg = htonl(regp.main_sp);
1082                 } else if(id == 0x1B) {
1083                     stlink_read_reg(sl, 18, &regp);
1084                     myreg = htonl(regp.process_sp);
1085                 } else if(id == 0x1C) {
1086                     stlink_read_unsupported_reg(sl, id, &regp);
1087                     myreg = htonl(regp.control);
1088                 } else if(id == 0x1D) {
1089                     stlink_read_unsupported_reg(sl, id, &regp);
1090                     myreg = htonl(regp.faultmask);
1091                 } else if(id == 0x1E) {
1092                     stlink_read_unsupported_reg(sl, id, &regp);
1093                     myreg = htonl(regp.basepri);
1094                 } else if(id == 0x1F) {
1095                     stlink_read_unsupported_reg(sl, id, &regp);
1096                     myreg = htonl(regp.primask);
1097                 } else if(id >= 0x20 && id < 0x40) {
1098                     stlink_read_unsupported_reg(sl, id, &regp);
1099                     myreg = htonl(regp.s[id-0x20]);
1100                 } else if(id == 0x40) {
1101                     stlink_read_unsupported_reg(sl, id, &regp);
1102                     myreg = htonl(regp.fpscr);
1103                 } else {
1104                     reply = strdup("E00");
1105                 }
1106
1107                 reply = calloc(8 + 1, 1);
1108                 sprintf(reply, "%08x", myreg);
1109
1110                 break;
1111             }
1112
1113             case 'P': {
1114                 char* s_reg = &packet[1];
1115                 char* s_value = strstr(&packet[1], "=") + 1;
1116
1117                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1118                 unsigned value = strtoul(s_value, NULL, 16);
1119
1120                 if(reg < 16) {
1121                     stlink_write_reg(sl, ntohl(value), reg);
1122                 } else if(reg == 0x19) {
1123                     stlink_write_reg(sl, ntohl(value), 16);
1124                 } else if(reg == 0x1A) {
1125                     stlink_write_reg(sl, ntohl(value), 17);
1126                 } else if(reg == 0x1B) {
1127                     stlink_write_reg(sl, ntohl(value), 18);
1128                 } else if(reg == 0x1C) {
1129                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1130                 } else if(reg == 0x1D) {
1131                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1132                 } else if(reg == 0x1E) {
1133                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1134                 } else if(reg == 0x1F) {
1135                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1136                 } else if(reg >= 0x20 && reg < 0x40) {
1137                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1138                 } else if(reg == 0x40) {
1139                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1140                 } else {
1141                     reply = strdup("E00");
1142                 }
1143
1144                 if(!reply) {
1145                     reply = strdup("OK");
1146                 }
1147
1148                 break;
1149             }
1150
1151             case 'G':
1152                 for(int i = 0; i < 16; i++) {
1153                     char str[9] = {0};
1154                     strncpy(str, &packet[1 + i * 8], 8);
1155                     uint32_t reg = strtoul(str, NULL, 16);
1156                     stlink_write_reg(sl, ntohl(reg), i);
1157                 }
1158
1159                 reply = strdup("OK");
1160                 break;
1161
1162             case 'm': {
1163                 char* s_start = &packet[1];
1164                 char* s_count = strstr(&packet[1], ",") + 1;
1165
1166                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1167                 unsigned     count = strtoul(s_count, NULL, 16);
1168
1169                 unsigned adj_start = start % 4;
1170                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1171
1172                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1173
1174                 reply = calloc(count * 2 + 1, 1);
1175                 for(unsigned int i = 0; i < count; i++) {
1176                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1177                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1178                 }
1179
1180                 break;
1181             }
1182
1183             case 'M': {
1184                 char* s_start = &packet[1];
1185                 char* s_count = strstr(&packet[1], ",") + 1;
1186                 char* hexdata = strstr(packet, ":") + 1;
1187
1188                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1189                 unsigned     count = strtoul(s_count, NULL, 16);
1190
1191                 if(start % 4) {
1192                     unsigned align_count = 4 - start % 4;
1193                     if (align_count > count) align_count = count;
1194                     for(unsigned int i = 0; i < align_count; i ++) {
1195                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1196                         uint8_t byte = strtoul(hex, NULL, 16);
1197                         sl->q_buf[i] = byte;
1198                     }
1199                     stlink_write_mem8(sl, start, align_count);
1200                     start += align_count;
1201                     count -= align_count;
1202                     hexdata += 2*align_count;
1203                 }
1204
1205                 if(count - count % 4) {
1206                     unsigned aligned_count = count - count % 4;
1207
1208                     for(unsigned int i = 0; i < aligned_count; i ++) {
1209                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1210                         uint8_t byte = strtoul(hex, NULL, 16);
1211                         sl->q_buf[i] = byte;
1212                     }
1213                     stlink_write_mem32(sl, start, aligned_count);
1214                     count -= aligned_count;
1215                     start += aligned_count;
1216                     hexdata += 2*aligned_count;
1217                 }
1218
1219                 if(count) {
1220                     for(unsigned int i = 0; i < count; i ++) {
1221                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1222                         uint8_t byte = strtoul(hex, NULL, 16);
1223                         sl->q_buf[i] = byte;
1224                     }
1225                     stlink_write_mem8(sl, start, count);
1226                 }
1227                 reply = strdup("OK");
1228                 break;
1229             }
1230
1231             case 'Z': {
1232                 char *endptr;
1233                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1234                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1235
1236                 switch (packet[1]) {
1237                     case '1':
1238                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1239                             reply = strdup("E00");
1240                         } else {
1241                             reply = strdup("OK");
1242                         }
1243                         break;
1244
1245                     case '2':   // insert write watchpoint
1246                     case '3':   // insert read  watchpoint
1247                     case '4': { // insert access watchpoint
1248                         enum watchfun wf;
1249                         if(packet[1] == '2') {
1250                             wf = WATCHWRITE;
1251                         } else if(packet[1] == '3') {
1252                             wf = WATCHREAD;
1253                         } else {
1254                             wf = WATCHACCESS;
1255                         }
1256
1257                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1258                             reply = strdup("E00");
1259                         } else {
1260                             reply = strdup("OK");
1261                             break;
1262                         }
1263                     }
1264
1265                     default:
1266                         reply = strdup("");
1267                 }
1268                 break;
1269             }
1270             case 'z': {
1271                 char *endptr;
1272                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1273                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1274
1275                 switch (packet[1]) {
1276                     case '1': // remove breakpoint
1277                         update_code_breakpoint(sl, addr, 0);
1278                         reply = strdup("OK");
1279                         break;
1280
1281                     case '2' : // remove write watchpoint
1282                     case '3' : // remove read watchpoint
1283                     case '4' : // remove access watchpoint
1284                         if(delete_data_watchpoint(sl, addr) < 0) {
1285                             reply = strdup("E00");
1286                         } else {
1287                             reply = strdup("OK");
1288                             break;
1289                         }
1290
1291                     default:
1292                         reply = strdup("");
1293                 }
1294                 break;
1295             }
1296
1297             case '!': {
1298                 /*
1299                  * Enter extended mode which allows restarting.
1300                  * We do support that always.
1301                  */
1302
1303                 /*
1304                  * Also, set to persistent mode
1305                  * to allow GDB disconnect.
1306                  */
1307                 st->persistent = 1;
1308
1309                 reply = strdup("OK");
1310
1311                 break;
1312             }
1313
1314             case 'R': {
1315                 /* Reset the core. */
1316
1317                 stlink_reset(sl);
1318                 init_code_breakpoints(sl);
1319                 init_data_watchpoints(sl);
1320
1321                 attached = 1;
1322
1323                 reply = strdup("OK");
1324
1325                 break;
1326             }
1327
1328             default:
1329                 reply = strdup("");
1330         }
1331
1332         if(reply) {
1333             DLOG("send: %s\n", reply);
1334
1335             int result = gdb_send_packet(client, reply);
1336             if(result != 0) {
1337                 ELOG("cannot send: %d\n", result);
1338                 free(reply);
1339                 free(packet);
1340 #ifdef __MINGW32__
1341                 win32_close_socket(sock);
1342 #endif
1343                 return 1;
1344             }
1345
1346             free(reply);
1347         }
1348
1349         free(packet);
1350     }
1351
1352 #ifdef __MINGW32__
1353     win32_close_socket(sock);
1354 #endif
1355
1356     return 0;
1357 }