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