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