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=\"0x60000000\" length=\"0x7fffffff\"/>"   // AHB3 Peripherals
 314     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 315     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 316     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 317     "</memory-map>";
 318
 319 static const char* const memory_map_template_F4_HD =
 320     "<?xml version=\"1.0\"?>"
 321     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 322     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 323     "<memory-map>"
 324     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"     // code = sram, bootrom or flash; flash is bigger
 325     "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"      // ccm ram
 326     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"      // sram
 327     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 328     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 329     "  </memory>"
 330     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 331     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 332     "  </memory>"
 333     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0xE0000\">"     //Sectors 5..11
 334     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 335     "  </memory>"
 336     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 337     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 338     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 339     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 340     "</memory-map>";
 341
 342 static const char* const memory_map_template =
 343     "<?xml version=\"1.0\"?>"
 344     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 345     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 346     "<memory-map>"
 347     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 348     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram 8k
 349     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 350     "    <property name=\"blocksize\">0x%zx</property>"
 351     "  </memory>"
 352     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 353     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 354     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 355     "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"         // option byte area
 356     "</memory-map>";
 357
 358 char* make_memory_map(stlink_t *sl) {
 359     /* This will be freed in serve() */
 360     char* map = malloc(4096);
 361     map[0] = '\0';
 362
 363     if(sl->chip_id==STM32_CHIPID_F4) {
 364         strcpy(map, memory_map_template_F4);
 365     } else if(sl->chip_id==STM32_CHIPID_F4_HD) {
 366         strcpy(map, memory_map_template_F4_HD);
 367     } else {
 368         snprintf(map, 4096, memory_map_template,
 369                 sl->flash_size,
 370                 sl->sram_size,
 371                 sl->flash_size, sl->flash_pgsz,
 372                 sl->sys_base, sl->sys_size);
 373     }
 374     return map;
 375 }
 376
 377
 378 /*
 379  * DWT_COMP0     0xE0001020
 380  * DWT_MASK0     0xE0001024
 381  * DWT_FUNCTION0 0xE0001028
 382  * DWT_COMP1     0xE0001030
 383  * DWT_MASK1     0xE0001034
 384  * DWT_FUNCTION1 0xE0001038
 385  * DWT_COMP2     0xE0001040
 386  * DWT_MASK2     0xE0001044
 387  * DWT_FUNCTION2 0xE0001048
 388  * DWT_COMP3     0xE0001050
 389  * DWT_MASK3     0xE0001054
 390  * DWT_FUNCTION3 0xE0001058
 391  */
 392
 393 #define DATA_WATCH_NUM 4
 394
 395 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 396
 397 struct code_hw_watchpoint {
 398     stm32_addr_t addr;
 399     uint8_t mask;
 400     enum watchfun fun;
 401 };
 402
 403 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 404
 405 static void init_data_watchpoints(stlink_t *sl) {
 406     DLOG("init watchpoints\n");
 407
 408     // set trcena in debug command to turn on dwt unit
 409     stlink_write_debug32(sl, 0xE000EDFC,
 410             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 411
 412     // make sure all watchpoints are cleared
 413     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 414         data_watches[i].fun = WATCHDISABLED;
 415         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 416     }
 417 }
 418
 419 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 420                                stm32_addr_t addr, unsigned int len) {
 421     int i = 0;
 422     uint32_t mask;
 423
 424     // computer mask
 425     // find a free watchpoint
 426     // configure
 427
 428     mask = -1;
 429     i = len;
 430     while(i) {
 431         i >>= 1;
 432         mask++;
 433     }
 434
 435     if((mask != (uint32_t)-1) && (mask < 16)) {
 436         for(i = 0; i < DATA_WATCH_NUM; i++) {
 437             // is this an empty slot ?
 438             if(data_watches[i].fun == WATCHDISABLED) {
 439                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 440
 441                 data_watches[i].fun = wf;
 442                 data_watches[i].addr = addr;
 443                 data_watches[i].mask = mask;
 444
 445                 // insert comparator address
 446                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 447
 448                 // insert mask
 449                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 450
 451                 // insert function
 452                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 453
 454                 // just to make sure the matched bit is clear !
 455                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 456                 return 0;
 457             }
 458         }
 459     }
 460
 461     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 462     return -1;
 463 }
 464
 465 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 466 {
 467     int i;
 468
 469     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 470         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 471             DLOG("delete watchpoint %d addr %x\n", i, addr);
 472
 473             data_watches[i].fun = WATCHDISABLED;
 474             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 475
 476             return 0;
 477         }
 478     }
 479
 480     DLOG("failure: delete watchpoint addr %x\n", addr);
 481
 482     return -1;
 483 }
 484
 485 #define CODE_BREAK_NUM  6
 486 #define CODE_LIT_NUM    2
 487 #define CODE_BREAK_LOW  0x01
 488 #define CODE_BREAK_HIGH 0x02
 489
 490 struct code_hw_breakpoint {
 491     stm32_addr_t addr;
 492     int          type;
 493 };
 494
 495 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 496
 497 static void init_code_breakpoints(stlink_t *sl) {
 498     memset(sl->q_buf, 0, 4);
 499     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 500     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 501     if (((val & 3) != 1) ||
 502             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 503             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 504         ELOG("[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 505                 ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 506     }
 507
 508
 509     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 510         code_breaks[i].type = 0;
 511         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 512     }
 513 }
 514
 515 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 516     stm32_addr_t fpb_addr = addr & ~0x3;
 517     int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 518
 519     if(addr & 1) {
 520         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 521         return -1;
 522     }
 523
 524     int id = -1;
 525     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 526         if(fpb_addr == code_breaks[i].addr ||
 527                 (set && code_breaks[i].type == 0)) {
 528             id = i;
 529             break;
 530         }
 531     }
 532
 533     if(id == -1) {
 534         if(set) return -1; // Free slot not found
 535         else    return 0;  // Breakpoint is already removed
 536     }
 537
 538     struct code_hw_breakpoint* brk = &code_breaks[id];
 539
 540     brk->addr = fpb_addr;
 541
 542     if(set) brk->type |= type;
 543     else        brk->type &= ~type;
 544
 545     if(brk->type == 0) {
 546         DLOG("clearing hw break %d\n", id);
 547
 548         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 549     } else {
 550         uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 551
 552         DLOG("setting hw break %d at %08x (%d)\n",
 553                     id, brk->addr, brk->type);
 554         DLOG("reg %08x \n",
 555                     mask);
 556
 557         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 558     }
 559
 560     return 0;
 561 }
 562
 563
 564 struct flash_block {
 565     stm32_addr_t addr;
 566     unsigned     length;
 567     uint8_t*     data;
 568
 569     struct flash_block* next;
 570 };
 571
 572 static struct flash_block* flash_root;
 573
 574 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 575
 576     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 577         ELOG("flash_add_block: incorrect bounds\n");
 578         return -1;
 579     }
 580
 581     stlink_calculate_pagesize(sl, addr);
 582     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 583         ELOG("flash_add_block: unaligned block\n");
 584         return -1;
 585     }
 586
 587     struct flash_block* new = malloc(sizeof(struct flash_block));
 588     new->next = flash_root;
 589
 590     new->addr   = addr;
 591     new->length = length;
 592     new->data   = calloc(length, 1);
 593
 594     flash_root = new;
 595
 596     return 0;
 597 }
 598
 599 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 600     unsigned int fit_blocks = 0, fit_length = 0;
 601
 602     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 603         /* Block: ------X------Y--------
 604          * Data:            a-----b
 605          *                a--b
 606          *            a-----------b
 607          * Block intersects with data, if:
 608          *  a < Y && b > x
 609          */
 610
 611         unsigned X = fb->addr, Y = fb->addr + fb->length;
 612         unsigned a = addr, b = addr + length;
 613         if(a < Y && b > X) {
 614             // from start of the block
 615             unsigned start = (a > X ? a : X) - X;
 616             unsigned end   = (b > Y ? Y : b) - X;
 617
 618             memcpy(fb->data + start, data, end - start);
 619
 620             fit_blocks++;
 621             fit_length += end - start;
 622         }
 623     }
 624
 625     if(fit_blocks == 0) {
 626         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 627         return -1;
 628     }
 629
 630     if(fit_length != length) {
 631         WLOG("data block %08x -> %04x truncated to %04x\n",
 632                 addr, length, fit_length);
 633         WLOG("(this is not an error, just a GDB glitch)\n");
 634     }
 635
 636     return 0;
 637 }
 638
 639 static int flash_go(stlink_t *sl) {
 640     int error = -1;
 641
 642     // Some kinds of clock settings do not allow writing to flash.
 643     stlink_reset(sl);
 644
 645     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 646         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 647
 648         unsigned length = fb->length;
 649         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 650
 651             //Update FLASH_PAGE
 652             stlink_calculate_pagesize(sl, page);
 653
 654             DLOG("flash_do: page %08x\n", page);
 655
 656             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 657                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 658                 goto error;
 659         }
 660     }
 661
 662     stlink_reset(sl);
 663
 664     error = 0;
 665
 666 error:
 667     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 668         next = fb->next;
 669         free(fb->data);
 670         free(fb);
 671     }
 672
 673     flash_root = NULL;
 674
 675     return error;
 676 }
 677
 678 int serve(stlink_t *sl, st_state_t *st) {
 679     int sock = socket(AF_INET, SOCK_STREAM, 0);
 680     if(sock < 0) {
 681         perror("socket");
 682         return 1;
 683     }
 684
 685     unsigned int val = 1;
 686     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 687
 688     struct sockaddr_in serv_addr;
 689     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 690     serv_addr.sin_family = AF_INET;
 691     serv_addr.sin_addr.s_addr = INADDR_ANY;
 692     serv_addr.sin_port = htons(st->listen_port);
 693
 694     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 695         perror("bind");
 696         return 1;
 697     }
 698
 699     if(listen(sock, 5) < 0) {
 700         perror("listen");
 701         return 1;
 702     }
 703
 704     ILOG("Listening at *:%d...\n", st->listen_port);
 705
 706     int client = accept(sock, NULL, NULL);
 707     //signal (SIGINT, SIG_DFL);
 708     if(client < 0) {
 709         perror("accept");
 710         return 1;
 711     }
 712
 713     close(sock);
 714
 715     stlink_force_debug(sl);
 716     if (st->reset) {
 717         stlink_reset(sl);
 718     }
 719     init_code_breakpoints(sl);
 720     init_data_watchpoints(sl);
 721
 722     ILOG("GDB connected.\n");
 723
 724     /*
 725      * To allow resetting the chip from GDB it is required to
 726      * emulate attaching and detaching to target.
 727      */
 728     unsigned int attached = 1;
 729
 730     while(1) {
 731         char* packet;
 732
 733         int status = gdb_recv_packet(client, &packet);
 734         if(status < 0) {
 735             ELOG("cannot recv: %d\n", status);
 736             return 1;
 737         }
 738
 739         DLOG("recv: %s\n", packet);
 740
 741         char* reply = NULL;
 742         reg regp;
 743
 744         switch(packet[0]) {
 745             case 'q': {
 746                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 747                     reply = strdup("");
 748                     break;
 749                 }
 750
 751                 char *separator = strstr(packet, ":"), *params = "";
 752                 if(separator == NULL) {
 753                     separator = packet + strlen(packet);
 754                 } else {
 755                     params = separator + 1;
 756                 }
 757
 758                 unsigned queryNameLength = (separator - &packet[1]);
 759                 char* queryName = calloc(queryNameLength + 1, 1);
 760                 strncpy(queryName, &packet[1], queryNameLength);
 761
 762                 DLOG("query: %s;%s\n", queryName, params);
 763
 764                 if(!strcmp(queryName, "Supported")) {
 765                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 766                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 767                     }
 768                     else {
 769                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 770                     }
 771                 } else if(!strcmp(queryName, "Xfer")) {
 772                     char *type, *op, *__s_addr, *s_length;
 773                     char *tok = params;
 774                     char *annex __attribute__((unused));
 775
 776                     type     = strsep(&tok, ":");
 777                     op       = strsep(&tok, ":");
 778                     annex    = strsep(&tok, ":");
 779                     __s_addr   = strsep(&tok, ",");
 780                     s_length = tok;
 781
 782                     unsigned addr = strtoul(__s_addr, NULL, 16),
 783                              length = strtoul(s_length, NULL, 16);
 784
 785                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 786                                 type, op, annex, addr, length);
 787
 788                     const char* data = NULL;
 789
 790                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 791                         data = current_memory_map;
 792
 793                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 794                         data = target_description_F4;
 795
 796                     if(data) {
 797                         unsigned data_length = strlen(data);
 798                         if(addr + length > data_length)
 799                             length = data_length - addr;
 800
 801                         if(length == 0) {
 802                             reply = strdup("l");
 803                         } else {
 804                             reply = calloc(length + 2, 1);
 805                             reply[0] = 'm';
 806                             strncpy(&reply[1], data, length);
 807                         }
 808                     }
 809                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 810                     // Rcmd uses the wrong separator
 811                     char *separator = strstr(packet, ","), *params = "";
 812                     if(separator == NULL) {
 813                         separator = packet + strlen(packet);
 814                     } else {
 815                         params = separator + 1;
 816                     }
 817
 818
 819                     if (!strncmp(params,"726573756d65",12)) {// resume
 820                         DLOG("Rcmd: resume\n");
 821                         stlink_run(sl);
 822
 823                         reply = strdup("OK");
 824                     } else if (!strncmp(params,"68616c74",8)) { //halt
 825                         reply = strdup("OK");
 826
 827                         stlink_force_debug(sl);
 828
 829                         DLOG("Rcmd: halt\n");
 830                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 831                         reply = strdup("OK");
 832
 833                         stlink_jtag_reset(sl, 0);
 834                         stlink_jtag_reset(sl, 1);
 835                         stlink_force_debug(sl);
 836
 837                         DLOG("Rcmd: jtag_reset\n");
 838                     } else if (!strncmp(params,"7265736574",10)) { //reset
 839                         reply = strdup("OK");
 840
 841                         stlink_force_debug(sl);
 842                         stlink_reset(sl);
 843                         init_code_breakpoints(sl);
 844                         init_data_watchpoints(sl);
 845
 846                         DLOG("Rcmd: reset\n");
 847                     } else {
 848                         DLOG("Rcmd: %s\n", params);
 849                     }
 850
 851                 }
 852
 853                 if(reply == NULL)
 854                     reply = strdup("");
 855
 856                 free(queryName);
 857
 858                 break;
 859             }
 860
 861             case 'v': {
 862                 char *params = NULL;
 863                 char *cmdName = strtok_r(packet, ":;", &params);
 864
 865                 cmdName++; // vCommand -> Command
 866
 867                 if(!strcmp(cmdName, "FlashErase")) {
 868                     char *__s_addr, *s_length;
 869                     char *tok = params;
 870
 871                     __s_addr   = strsep(&tok, ",");
 872                     s_length = tok;
 873
 874                     unsigned addr = strtoul(__s_addr, NULL, 16),
 875                              length = strtoul(s_length, NULL, 16);
 876
 877                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 878                                 addr, length);
 879
 880                     if(flash_add_block(addr, length, sl) < 0) {
 881                         reply = strdup("E00");
 882                     } else {
 883                         reply = strdup("OK");
 884                     }
 885                 } else if(!strcmp(cmdName, "FlashWrite")) {
 886                     char *__s_addr, *data;
 887                     char *tok = params;
 888
 889                     __s_addr = strsep(&tok, ":");
 890                     data   = tok;
 891
 892                     unsigned addr = strtoul(__s_addr, NULL, 16);
 893                     unsigned data_length = status - (data - packet);
 894
 895                     // Length of decoded data cannot be more than
 896                     // encoded, as escapes are removed.
 897                     // Additional byte is reserved for alignment fix.
 898                     uint8_t *decoded = calloc(data_length + 1, 1);
 899                     unsigned dec_index = 0;
 900                     for(unsigned int i = 0; i < data_length; i++) {
 901                         if(data[i] == 0x7d) {
 902                             i++;
 903                             decoded[dec_index++] = data[i] ^ 0x20;
 904                         } else {
 905                             decoded[dec_index++] = data[i];
 906                         }
 907                     }
 908
 909                     // Fix alignment
 910                     if(dec_index % 2 != 0)
 911                         dec_index++;
 912
 913                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 914
 915                     if(flash_populate(addr, decoded, dec_index) < 0) {
 916                         reply = strdup("E00");
 917                     } else {
 918                         reply = strdup("OK");
 919                     }
 920                 } else if(!strcmp(cmdName, "FlashDone")) {
 921                     if(flash_go(sl) < 0) {
 922                         reply = strdup("E00");
 923                     } else {
 924                         reply = strdup("OK");
 925                     }
 926                 } else if(!strcmp(cmdName, "Kill")) {
 927                     attached = 0;
 928
 929                     reply = strdup("OK");
 930                 }
 931
 932                 if(reply == NULL)
 933                     reply = strdup("");
 934
 935                 break;
 936             }
 937
 938             case 'c':
 939                 stlink_run(sl);
 940
 941                 while(1) {
 942                     int status = gdb_check_for_interrupt(client);
 943                     if(status < 0) {
 944                         ELOG("cannot check for int: %d\n", status);
 945                         return 1;
 946                     }
 947
 948                     if(status == 1) {
 949                         stlink_force_debug(sl);
 950                         break;
 951                     }
 952
 953                     stlink_status(sl);
 954                     if(sl->core_stat == STLINK_CORE_HALTED) {
 955                         break;
 956                     }
 957
 958                     usleep(100000);
 959                 }
 960
 961                 reply = strdup("S05"); // TRAP
 962                 break;
 963
 964             case 's':
 965                 stlink_step(sl);
 966
 967                 reply = strdup("S05"); // TRAP
 968                 break;
 969
 970             case '?':
 971                 if(attached) {
 972                     reply = strdup("S05"); // TRAP
 973                 } else {
 974                     /* Stub shall reply OK if not attached. */
 975                     reply = strdup("OK");
 976                 }
 977                 break;
 978
 979             case 'g':
 980                 stlink_read_all_regs(sl, &regp);
 981
 982                 reply = calloc(8 * 16 + 1, 1);
 983                 for(int i = 0; i < 16; i++)
 984                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 985
 986                 break;
 987
 988             case 'p': {
 989                 unsigned id = strtoul(&packet[1], NULL, 16);
 990                 unsigned myreg = 0xDEADDEAD;
 991
 992                 if(id < 16) {
 993                     stlink_read_reg(sl, id, &regp);
 994                     myreg = htonl(regp.r[id]);
 995                 } else if(id == 0x19) {
 996                     stlink_read_reg(sl, 16, &regp);
 997                     myreg = htonl(regp.xpsr);
 998                 } else if(id == 0x1A) {
 999                     stlink_read_reg(sl, 17, &regp);
1000                     myreg = htonl(regp.main_sp);
1001                 } else if(id == 0x1B) {
1002                     stlink_read_reg(sl, 18, &regp);
1003                     myreg = htonl(regp.process_sp);
1004                 } else if(id == 0x1C) {
1005                     stlink_read_unsupported_reg(sl, id, &regp);
1006                     myreg = htonl(regp.control);
1007                 } else if(id == 0x1D) {
1008                     stlink_read_unsupported_reg(sl, id, &regp);
1009                     myreg = htonl(regp.faultmask);
1010                 } else if(id == 0x1E) {
1011                     stlink_read_unsupported_reg(sl, id, &regp);
1012                     myreg = htonl(regp.basepri);
1013                 } else if(id == 0x1F) {
1014                     stlink_read_unsupported_reg(sl, id, &regp);
1015                     myreg = htonl(regp.primask);
1016                 } else if(id >= 0x20 && id < 0x40) {
1017                     stlink_read_unsupported_reg(sl, id, &regp);
1018                     myreg = htonl(regp.s[id-0x20]);
1019                 } else if(id == 0x40) {
1020                     stlink_read_unsupported_reg(sl, id, &regp);
1021                     myreg = htonl(regp.fpscr);
1022                 } else {
1023                     reply = strdup("E00");
1024                 }
1025
1026                 reply = calloc(8 + 1, 1);
1027                 sprintf(reply, "%08x", myreg);
1028
1029                 break;
1030             }
1031
1032             case 'P': {
1033                 char* s_reg = &packet[1];
1034                 char* s_value = strstr(&packet[1], "=") + 1;
1035
1036                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1037                 unsigned value = strtoul(s_value, NULL, 16);
1038
1039                 if(reg < 16) {
1040                     stlink_write_reg(sl, ntohl(value), reg);
1041                 } else if(reg == 0x19) {
1042                     stlink_write_reg(sl, ntohl(value), 16);
1043                 } else if(reg == 0x1A) {
1044                     stlink_write_reg(sl, ntohl(value), 17);
1045                 } else if(reg == 0x1B) {
1046                     stlink_write_reg(sl, ntohl(value), 18);
1047                 } else if(reg == 0x1C) {
1048                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1049                 } else if(reg == 0x1D) {
1050                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1051                 } else if(reg == 0x1E) {
1052                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1053                 } else if(reg == 0x1F) {
1054                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1055                 } else if(reg >= 0x20 && reg < 0x40) {
1056                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1057                 } else if(reg == 0x40) {
1058                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1059                 } else {
1060                     reply = strdup("E00");
1061                 }
1062
1063                 if(!reply) {
1064                     reply = strdup("OK");
1065                 }
1066
1067                 break;
1068             }
1069
1070             case 'G':
1071                 for(int i = 0; i < 16; i++) {
1072                     char str[9] = {0};
1073                     strncpy(str, &packet[1 + i * 8], 8);
1074                     uint32_t reg = strtoul(str, NULL, 16);
1075                     stlink_write_reg(sl, ntohl(reg), i);
1076                 }
1077
1078                 reply = strdup("OK");
1079                 break;
1080
1081             case 'm': {
1082                 char* s_start = &packet[1];
1083                 char* s_count = strstr(&packet[1], ",") + 1;
1084
1085                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1086                 unsigned     count = strtoul(s_count, NULL, 16);
1087
1088                 unsigned adj_start = start % 4;
1089                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1090
1091                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1092
1093                 reply = calloc(count * 2 + 1, 1);
1094                 for(unsigned int i = 0; i < count; i++) {
1095                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1096                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1097                 }
1098
1099                 break;
1100             }
1101
1102             case 'M': {
1103                 char* s_start = &packet[1];
1104                 char* s_count = strstr(&packet[1], ",") + 1;
1105                 char* hexdata = strstr(packet, ":") + 1;
1106
1107                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1108                 unsigned     count = strtoul(s_count, NULL, 16);
1109
1110                 if(start % 4) {
1111                     unsigned align_count = 4 - start % 4;
1112                     if (align_count > count) align_count = count;
1113                     for(unsigned int i = 0; i < align_count; i ++) {
1114                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1115                         uint8_t byte = strtoul(hex, NULL, 16);
1116                         sl->q_buf[i] = byte;
1117                     }
1118                     stlink_write_mem8(sl, start, align_count);
1119                     start += align_count;
1120                     count -= align_count;
1121                     hexdata += 2*align_count;
1122                 }
1123
1124                 if(count - count % 4) {
1125                     unsigned aligned_count = count - count % 4;
1126
1127                     for(unsigned int i = 0; i < aligned_count; i ++) {
1128                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1129                         uint8_t byte = strtoul(hex, NULL, 16);
1130                         sl->q_buf[i] = byte;
1131                     }
1132                     stlink_write_mem32(sl, start, aligned_count);
1133                     count -= aligned_count;
1134                     start += aligned_count;
1135                     hexdata += 2*aligned_count;
1136                 }
1137
1138                 if(count) {
1139                     for(unsigned int i = 0; i < 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_mem8(sl, start, count);
1145                 }
1146                 reply = strdup("OK");
1147                 break;
1148             }
1149
1150             case 'Z': {
1151                 char *endptr;
1152                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1153                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1154
1155                 switch (packet[1]) {
1156                     case '1':
1157                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1158                             reply = strdup("E00");
1159                         } else {
1160                             reply = strdup("OK");
1161                         }
1162                         break;
1163
1164                     case '2':   // insert write watchpoint
1165                     case '3':   // insert read  watchpoint
1166                     case '4': { // insert access watchpoint
1167                         enum watchfun wf;
1168                         if(packet[1] == '2') {
1169                             wf = WATCHWRITE;
1170                         } else if(packet[1] == '3') {
1171                             wf = WATCHREAD;
1172                         } else {
1173                             wf = WATCHACCESS;
1174                         }
1175
1176                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1177                             reply = strdup("E00");
1178                         } else {
1179                             reply = strdup("OK");
1180                             break;
1181                         }
1182                     }
1183
1184                     default:
1185                         reply = strdup("");
1186                 }
1187                 break;
1188             }
1189             case 'z': {
1190                 char *endptr;
1191                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1192                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1193
1194                 switch (packet[1]) {
1195                     case '1': // remove breakpoint
1196                         update_code_breakpoint(sl, addr, 0);
1197                         reply = strdup("OK");
1198                         break;
1199
1200                     case '2' : // remove write watchpoint
1201                     case '3' : // remove read watchpoint
1202                     case '4' : // remove access watchpoint
1203                         if(delete_data_watchpoint(sl, addr) < 0) {
1204                             reply = strdup("E00");
1205                         } else {
1206                             reply = strdup("OK");
1207                             break;
1208                         }
1209
1210                     default:
1211                         reply = strdup("");
1212                 }
1213                 break;
1214             }
1215
1216             case '!': {
1217                 /*
1218                  * Enter extended mode which allows restarting.
1219                  * We do support that always.
1220                  */
1221
1222                 /*
1223                  * Also, set to persistent mode
1224                  * to allow GDB disconnect.
1225                  */
1226                 st->persistent = 1;
1227
1228                 reply = strdup("OK");
1229
1230                 break;
1231             }
1232
1233             case 'R': {
1234                 /* Reset the core. */
1235
1236                 stlink_reset(sl);
1237                 init_code_breakpoints(sl);
1238                 init_data_watchpoints(sl);
1239
1240                 attached = 1;
1241
1242                 reply = strdup("OK");
1243
1244                 break;
1245             }
1246
1247             default:
1248                 reply = strdup("");
1249         }
1250
1251         if(reply) {
1252             DLOG("send: %s\n", reply);
1253
1254             int result = gdb_send_packet(client, reply);
1255             if(result != 0) {
1256                 ELOG("cannot send: %d\n", result);
1257                 free(reply);
1258                 free(packet);
1259                 return 1;
1260             }
1261
1262             free(reply);
1263         }
1264
1265         free(packet);
1266     }
1267
1268     return 0;
1269 }