git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

   1 /* -*- tab-width:8 -*- */
   2 #define DEBUG 0
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <getopt.h>
  10 #include <signal.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #ifdef __MINGW32__
  17 #include "mingw.h"
  18 #else
  19 #include <sys/socket.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #endif
  23
  24 #include <stlink-common.h>
  25
  26 #include "gdb-remote.h"
  27
  28 #define DEFAULT_LOGGING_LEVEL 50
  29 #define DEFAULT_GDB_LISTEN_PORT 4242
  30
  31 #define STRINGIFY_inner(name) #name
  32 #define STRINGIFY(name) STRINGIFY_inner(name)
  33
  34 #define FLASH_BASE 0x08000000
  35
  36 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  37 #define FLASH_PAGE (sl->flash_pgsz)
  38
  39 stlink_t *connected_stlink = NULL;
  40
  41 static const char hex[] = "0123456789abcdef";
  42
  43 static const char* current_memory_map = NULL;
  44
  45 typedef struct _st_state_t {
  46     // things from command line, bleh
  47     int stlink_version;
  48     int logging_level;
  49     int listen_port;
  50     int persistent;
  51     int reset;
  52 } st_state_t;
  53
  54
  55 int serve(stlink_t *sl, st_state_t *st);
  56 char* make_memory_map(stlink_t *sl);
  57
  58 static void cleanup(int signal __attribute__((unused))) {
  59     if (connected_stlink) {
  60         /* Switch back to mass storage mode before closing. */
  61         stlink_run(connected_stlink);
  62         stlink_exit_debug_mode(connected_stlink);
  63         stlink_close(connected_stlink);
  64     }
  65
  66     exit(1);
  67 }
  68
  69
  70
  71 int parse_options(int argc, char** argv, st_state_t *st) {
  72     static struct option long_options[] = {
  73         {"help", no_argument, NULL, 'h'},
  74         {"verbose", optional_argument, NULL, 'v'},
  75         {"stlink_version", required_argument, NULL, 's'},
  76         {"stlinkv1", no_argument, NULL, '1'},
  77                 {"listen_port", required_argument, NULL, 'p'},
  78                 {"multi", optional_argument, NULL, 'm'},
  79                 {"no-reset", optional_argument, NULL, 'n'},
  80         {0, 0, 0, 0},
  81     };
  82         const char * help_str = "%s - usage:\n\n"
  83         "  -h, --help\t\tPrint this help\n"
  84         "  -vXX, --verbose=XX\tSpecify a specific verbosity level (0..99)\n"
  85         "  -v, --verbose\t\tSpecify generally verbose logging\n"
  86         "  -s X, --stlink_version=X\n"
  87         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  88         "  -1, --stlinkv1\tForce stlink version 1\n"
  89         "  -p 4242, --listen_port=1234\n"
  90         "\t\t\tSet the gdb server listen port. "
  91         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  92     "  -m, --multi\n"
  93     "\t\t\tSet gdb server to extended mode.\n"
  94     "\t\t\tst-util will continue listening for connections after disconnect.\n"
  95     "  -n, --no-reset\n"
  96     "\t\t\tDo not reset board on connection.\n"
  97         "\n"
  98         "The STLINKv2 device to use can be specified in the environment\n"
  99         "variable STLINK_DEVICE on the format <USB_BUS>:<USB_ADDR>.\n"
 100         "\n"
 101         ;
 102
 103
 104     int option_index = 0;
 105     int c;
 106     int q;
 107     while ((c = getopt_long(argc, argv, "hv::s:1p:mn", long_options, &option_index)) != -1) {
 108         switch (c) {
 109         case 0:
 110             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 111             printf("option %s", long_options[option_index].name);
 112             if (optarg) {
 113                 printf(" with arg %s", optarg);
 114             }
 115             printf("\n");
 116             break;
 117         case 'h':
 118             printf(help_str, argv[0]);
 119             exit(EXIT_SUCCESS);
 120             break;
 121         case 'v':
 122             if (optarg) {
 123                 st->logging_level = atoi(optarg);
 124             } else {
 125                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 126             }
 127             break;
 128                 case '1':
 129                         st->stlink_version = 1;
 130                         break;
 131                 case 's':
 132                         sscanf(optarg, "%i", &q);
 133                         if (q < 0 || q > 2) {
 134                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 135                                 exit(EXIT_FAILURE);
 136                         }
 137                         st->stlink_version = q;
 138                         break;
 139                 case 'p':
 140                         sscanf(optarg, "%i", &q);
 141                         if (q < 0) {
 142                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 143                                 exit(EXIT_FAILURE);
 144                         }
 145                         st->listen_port = q;
 146                         break;
 147                 case 'm':
 148                         st->persistent = 1;
 149                         break;
 150                 case 'n':
 151                         st->reset = 0;
 152                         break;
 153         }
 154     }
 155
 156     if (optind < argc) {
 157         printf("non-option ARGV-elements: ");
 158         while (optind < argc)
 159             printf("%s ", argv[optind++]);
 160         printf("\n");
 161     }
 162     return 0;
 163 }
 164
 165
 166 int main(int argc, char** argv) {
 167         int32_t voltage;
 168
 169         stlink_t *sl = NULL;
 170
 171         st_state_t state;
 172         memset(&state, 0, sizeof(state));
 173         // set defaults...
 174         state.stlink_version = 2;
 175         state.logging_level = DEFAULT_LOGGING_LEVEL;
 176         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 177         state.reset = 1;    /* By default, reset board */
 178         parse_options(argc, argv, &state);
 179         switch (state.stlink_version) {
 180         case 2:
 181                 sl = stlink_open_usb(state.logging_level, 0);
 182                 if(sl == NULL) return 1;
 183                 break;
 184         case 1:
 185                 sl = stlink_v1_open(state.logging_level, 0);
 186                 if(sl == NULL) return 1;
 187                 break;
 188     }
 189
 190     connected_stlink = sl;
 191     signal(SIGINT, &cleanup);
 192     signal(SIGTERM, &cleanup);
 193
 194     if (state.reset) {
 195                 stlink_reset(sl);
 196     }
 197
 198         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 199
 200         voltage = stlink_target_voltage(sl);
 201         if (voltage != -1) {
 202                 printf("Target voltage is %d mV.\n", voltage);
 203         }
 204
 205         sl->verbose=0;
 206
 207         current_memory_map = make_memory_map(sl);
 208
 209 #ifdef __MINGW32__
 210         WSADATA wsadata;
 211         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 212                 goto winsock_error;
 213         }
 214 #endif
 215
 216         do {
 217                 serve(sl, &state);
 218
 219                 /* Continue */
 220                 stlink_run(sl);
 221         } while (state.persistent);
 222
 223 #ifdef __MINGW32__
 224 winsock_error:
 225         WSACleanup();
 226 #endif
 227
 228         /* Switch back to mass storage mode before closing. */
 229         stlink_exit_debug_mode(sl);
 230         stlink_close(sl);
 231
 232         return 0;
 233 }
 234
 235 static const char* const target_description_F4 =
 236     "<?xml version=\"1.0\"?>"
 237     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 238     "<target version=\"1.0\">"
 239     "   <architecture>arm</architecture>"
 240     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 241     "       <reg name=\"r0\" bitsize=\"32\"/>"
 242     "       <reg name=\"r1\" bitsize=\"32\"/>"
 243     "       <reg name=\"r2\" bitsize=\"32\"/>"
 244     "       <reg name=\"r3\" bitsize=\"32\"/>"
 245     "       <reg name=\"r4\" bitsize=\"32\"/>"
 246     "       <reg name=\"r5\" bitsize=\"32\"/>"
 247     "       <reg name=\"r6\" bitsize=\"32\"/>"
 248     "       <reg name=\"r7\" bitsize=\"32\"/>"
 249     "       <reg name=\"r8\" bitsize=\"32\"/>"
 250     "       <reg name=\"r9\" bitsize=\"32\"/>"
 251     "       <reg name=\"r10\" bitsize=\"32\"/>"
 252     "       <reg name=\"r11\" bitsize=\"32\"/>"
 253     "       <reg name=\"r12\" bitsize=\"32\"/>"
 254     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 255     "       <reg name=\"lr\" bitsize=\"32\"/>"
 256     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 257     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 258     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 259     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 260     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 261     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 262     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 263     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 264     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 271     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 272     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 285     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 286     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 287     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 288     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 289     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 290     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 291     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 292     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 293     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 294     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 295     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 296     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 297     "   </feature>"
 298     "</target>";
 299
 300 static const char* const memory_map_template_F4 =
 301   "<?xml version=\"1.0\"?>"
 302   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 303   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 304   "<memory-map>"
 305   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 306   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 307   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 308   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 309   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 310   "  </memory>"
 311   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 312   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 313   "  </memory>"
 314   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 315   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 316   "  </memory>"
 317   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 318   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 319   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 320   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 321   "</memory-map>";
 322
 323 static const char* const memory_map_template =
 324   "<?xml version=\"1.0\"?>"
 325   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 326   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 327   "<memory-map>"
 328   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 329   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 330   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 331   "    <property name=\"blocksize\">0x%zx</property>"
 332   "  </memory>"
 333   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 334   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 335   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 336   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 337   "</memory-map>";
 338
 339 char* make_memory_map(stlink_t *sl) {
 340         /* This will be freed in serve() */
 341         char* map = malloc(4096);
 342         map[0] = '\0';
 343
 344         if(sl->chip_id==STM32_CHIPID_F4) {
 345         strcpy(map, memory_map_template_F4);
 346     } else {
 347         snprintf(map, 4096, memory_map_template,
 348                         sl->flash_size,
 349                         sl->sram_size,
 350                         sl->flash_size, sl->flash_pgsz,
 351                         sl->sys_base, sl->sys_size);
 352     }
 353         return map;
 354 }
 355
 356
 357 /*
 358  * DWT_COMP0     0xE0001020
 359  * DWT_MASK0     0xE0001024
 360  * DWT_FUNCTION0 0xE0001028
 361  * DWT_COMP1     0xE0001030
 362  * DWT_MASK1     0xE0001034
 363  * DWT_FUNCTION1 0xE0001038
 364  * DWT_COMP2     0xE0001040
 365  * DWT_MASK2     0xE0001044
 366  * DWT_FUNCTION2 0xE0001048
 367  * DWT_COMP3     0xE0001050
 368  * DWT_MASK3     0xE0001054
 369  * DWT_FUNCTION3 0xE0001058
 370  */
 371
 372 #define DATA_WATCH_NUM 4
 373
 374 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 375
 376 struct code_hw_watchpoint {
 377         stm32_addr_t addr;
 378         uint8_t mask;
 379         enum watchfun fun;
 380 };
 381
 382 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 383
 384 static void init_data_watchpoints(stlink_t *sl) {
 385         #if DEBUG
 386         printf("init watchpoints\n");
 387         #endif
 388
 389         // set trcena in debug command to turn on dwt unit
 390         stlink_write_debug32(sl, 0xE000EDFC,
 391                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 392
 393         // make sure all watchpoints are cleared
 394         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 395                 data_watches[i].fun = WATCHDISABLED;
 396                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 397         }
 398 }
 399
 400 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 401 {
 402         int i = 0;
 403         uint32_t mask;
 404
 405         // computer mask
 406         // find a free watchpoint
 407         // configure
 408
 409         mask = -1;
 410         i = len;
 411         while(i) {
 412                 i >>= 1;
 413                 mask++;
 414         }
 415
 416         if((mask != (uint32_t)-1) && (mask < 16)) {
 417                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 418                         // is this an empty slot ?
 419                         if(data_watches[i].fun == WATCHDISABLED) {
 420                                 #if DEBUG
 421                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 422                                 #endif
 423
 424                                 data_watches[i].fun = wf;
 425                                 data_watches[i].addr = addr;
 426                                 data_watches[i].mask = mask;
 427
 428                                 // insert comparator address
 429                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 430
 431                                 // insert mask
 432                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 433
 434                                 // insert function
 435                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 436
 437                                 // just to make sure the matched bit is clear !
 438                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 439                                 return 0;
 440                         }
 441                 }
 442         }
 443
 444         #if DEBUG
 445         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 446         #endif
 447         return -1;
 448 }
 449
 450 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 451 {
 452         int i;
 453
 454         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 455                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 456                         #if DEBUG
 457                         printf("delete watchpoint %d addr %x\n", i, addr);
 458                         #endif
 459
 460                         data_watches[i].fun = WATCHDISABLED;
 461                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 462
 463                         return 0;
 464                 }
 465         }
 466
 467         #if DEBUG
 468         printf("failure: delete watchpoint addr %x\n", addr);
 469         #endif
 470
 471         return -1;
 472 }
 473
 474 #define CODE_BREAK_NUM  6
 475 #define CODE_LIT_NUM    2
 476 #define CODE_BREAK_LOW  0x01
 477 #define CODE_BREAK_HIGH 0x02
 478
 479 struct code_hw_breakpoint {
 480         stm32_addr_t addr;
 481         int          type;
 482 };
 483
 484 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 485
 486 static void init_code_breakpoints(stlink_t *sl) {
 487         memset(sl->q_buf, 0, 4);
 488         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 489         unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 490         if (((val & 3) != 1) ||
 491             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 492             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 493           fprintf(stderr, "[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 494             ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 495         }
 496
 497
 498         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 499                 code_breaks[i].type = 0;
 500                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 501         }
 502 }
 503
 504 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 505         stm32_addr_t fpb_addr = addr & ~0x3;
 506         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 507
 508         if(addr & 1) {
 509                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 510                 return -1;
 511         }
 512
 513         int id = -1;
 514         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 515                 if(fpb_addr == code_breaks[i].addr ||
 516                         (set && code_breaks[i].type == 0)) {
 517                         id = i;
 518                         break;
 519                 }
 520         }
 521
 522         if(id == -1) {
 523                 if(set) return -1; // Free slot not found
 524                 else    return 0;  // Breakpoint is already removed
 525         }
 526
 527         struct code_hw_breakpoint* brk = &code_breaks[id];
 528
 529         brk->addr = fpb_addr;
 530
 531         if(set) brk->type |= type;
 532         else    brk->type &= ~type;
 533
 534         if(brk->type == 0) {
 535                 #if DEBUG
 536                 printf("clearing hw break %d\n", id);
 537                 #endif
 538
 539                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 540         } else {
 541                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 542
 543                 #if DEBUG
 544                 printf("setting hw break %d at %08x (%d)\n",
 545                         id, brk->addr, brk->type);
 546                 printf("reg %08x \n",
 547                         mask);
 548                 #endif
 549
 550                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 551         }
 552
 553         return 0;
 554 }
 555
 556
 557 struct flash_block {
 558         stm32_addr_t addr;
 559         unsigned     length;
 560         uint8_t*     data;
 561
 562         struct flash_block* next;
 563 };
 564
 565 static struct flash_block* flash_root;
 566
 567 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 568
 569         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 570                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 571                 return -1;
 572         }
 573
 574         stlink_calculate_pagesize(sl, addr);
 575         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 576                 fprintf(stderr, "flash_add_block: unaligned block\n");
 577                 return -1;
 578         }
 579
 580         struct flash_block* new = malloc(sizeof(struct flash_block));
 581         new->next = flash_root;
 582
 583         new->addr   = addr;
 584         new->length = length;
 585         new->data   = calloc(length, 1);
 586
 587         flash_root = new;
 588
 589         return 0;
 590 }
 591
 592 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 593         unsigned int fit_blocks = 0, fit_length = 0;
 594
 595         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 596                 /* Block: ------X------Y--------
 597                  * Data:            a-----b
 598                  *                a--b
 599                  *            a-----------b
 600                  * Block intersects with data, if:
 601                  *  a < Y && b > x
 602                  */
 603
 604                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 605                 unsigned a = addr, b = addr + length;
 606                 if(a < Y && b > X) {
 607                         // from start of the block
 608                         unsigned start = (a > X ? a : X) - X;
 609                         unsigned end   = (b > Y ? Y : b) - X;
 610
 611                         memcpy(fb->data + start, data, end - start);
 612
 613                         fit_blocks++;
 614                         fit_length += end - start;
 615                 }
 616         }
 617
 618         if(fit_blocks == 0) {
 619                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 620                 return -1;
 621         }
 622
 623         if(fit_length != length) {
 624                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 625                         addr, length, fit_length);
 626                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 627         }
 628
 629         return 0;
 630 }
 631
 632 static int flash_go(stlink_t *sl) {
 633         int error = -1;
 634
 635         // Some kinds of clock settings do not allow writing to flash.
 636         stlink_reset(sl);
 637
 638         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 639                 #if DEBUG
 640                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 641                 #endif
 642
 643                 unsigned length = fb->length;
 644                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 645
 646                         //Update FLASH_PAGE
 647                         stlink_calculate_pagesize(sl, page);
 648
 649                         #if DEBUG
 650                         printf("flash_do: page %08x\n", page);
 651                         #endif
 652
 653                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 654                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 655                                 goto error;
 656                         }
 657         }
 658
 659         stlink_reset(sl);
 660
 661         error = 0;
 662
 663 error:
 664         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 665                 next = fb->next;
 666                 free(fb->data);
 667                 free(fb);
 668         }
 669
 670         flash_root = NULL;
 671
 672         return error;
 673 }
 674
 675 int serve(stlink_t *sl, st_state_t *st) {
 676         int sock = socket(AF_INET, SOCK_STREAM, 0);
 677         if(sock < 0) {
 678                 perror("socket");
 679                 return 1;
 680         }
 681
 682         unsigned int val = 1;
 683         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 684
 685         struct sockaddr_in serv_addr;
 686         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 687         serv_addr.sin_family = AF_INET;
 688         serv_addr.sin_addr.s_addr = INADDR_ANY;
 689         serv_addr.sin_port = htons(st->listen_port);
 690
 691         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 692                 perror("bind");
 693                 return 1;
 694         }
 695
 696         if(listen(sock, 5) < 0) {
 697                 perror("listen");
 698                 return 1;
 699         }
 700
 701         printf("Listening at *:%d...\n", st->listen_port);
 702
 703         int client = accept(sock, NULL, NULL);
 704         //signal (SIGINT, SIG_DFL);
 705         if(client < 0) {
 706                 perror("accept");
 707                 return 1;
 708         }
 709
 710         close(sock);
 711
 712         stlink_force_debug(sl);
 713         if (st->reset) {
 714                 stlink_reset(sl);
 715     }
 716         init_code_breakpoints(sl);
 717         init_data_watchpoints(sl);
 718
 719         printf("GDB connected.\n");
 720
 721         /*
 722          * To allow resetting the chip from GDB it is required to
 723          * emulate attaching and detaching to target.
 724          */
 725         unsigned int attached = 1;
 726
 727         while(1) {
 728                 char* packet;
 729
 730                 int status = gdb_recv_packet(client, &packet);
 731                 if(status < 0) {
 732                         fprintf(stderr, "cannot recv: %d\n", status);
 733                         return 1;
 734                 }
 735
 736                 #if DEBUG
 737                 printf("recv: %s\n", packet);
 738                 #endif
 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                         #if DEBUG
 762                         printf("query: %s;%s\n", queryName, params);
 763                         #endif
 764
 765                         if(!strcmp(queryName, "Supported")) {
 766                 if(sl->chip_id==STM32_CHIPID_F4) {
 767                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 768                 }
 769                 else {
 770                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 771                 }
 772                         } else if(!strcmp(queryName, "Xfer")) {
 773                                 char *type, *op, *__s_addr, *s_length;
 774                                 char *tok = params;
 775                                 char *annex __attribute__((unused));
 776
 777                                 type     = strsep(&tok, ":");
 778                                 op       = strsep(&tok, ":");
 779                                 annex    = strsep(&tok, ":");
 780                                 __s_addr   = strsep(&tok, ",");
 781                                 s_length = tok;
 782
 783                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 784                                        length = strtoul(s_length, NULL, 16);
 785
 786                                 #if DEBUG
 787                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 788                                         type, op, annex, addr, length);
 789                                 #endif
 790
 791                                 const char* data = NULL;
 792
 793                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 794                                         data = current_memory_map;
 795
 796                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 797                                         data = target_description_F4;
 798
 799                                 if(data) {
 800                                         unsigned data_length = strlen(data);
 801                                         if(addr + length > data_length)
 802                                                 length = data_length - addr;
 803
 804                                         if(length == 0) {
 805                                                 reply = strdup("l");
 806                                         } else {
 807                                                 reply = calloc(length + 2, 1);
 808                                                 reply[0] = 'm';
 809                                                 strncpy(&reply[1], data, length);
 810                                         }
 811                                 }
 812                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 813                                 // Rcmd uses the wrong separator
 814                                 char *separator = strstr(packet, ","), *params = "";
 815                                 if(separator == NULL) {
 816                                         separator = packet + strlen(packet);
 817                                 } else {
 818                                         params = separator + 1;
 819                                 }
 820
 821
 822                                 if (!strncmp(params,"726573756d65",12)) {// resume
 823 #if DEBUG
 824                                         printf("Rcmd: resume\n");
 825 #endif
 826                                         stlink_run(sl);
 827
 828                                         reply = strdup("OK");
 829                 } else if (!strncmp(params,"68616c74",8)) { //halt
 830                                         reply = strdup("OK");
 831
 832                                         stlink_force_debug(sl);
 833
 834 #if DEBUG
 835                                         printf("Rcmd: halt\n");
 836 #endif
 837                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 838                                         reply = strdup("OK");
 839
 840                                         stlink_jtag_reset(sl, 1);
 841                                         stlink_jtag_reset(sl, 0);
 842                                         stlink_force_debug(sl);
 843
 844 #if DEBUG
 845                                         printf("Rcmd: jtag_reset\n");
 846 #endif
 847                 } else if (!strncmp(params,"7265736574",10)) { //reset
 848                                         reply = strdup("OK");
 849
 850                                         stlink_force_debug(sl);
 851                                         stlink_reset(sl);
 852                                         init_code_breakpoints(sl);
 853                                         init_data_watchpoints(sl);
 854
 855 #if DEBUG
 856                                         printf("Rcmd: reset\n");
 857 #endif
 858                                 } else {
 859 #if DEBUG
 860                                         printf("Rcmd: %s\n", params);
 861 #endif
 862
 863                                 }
 864
 865                         }
 866
 867                         if(reply == NULL)
 868                                 reply = strdup("");
 869
 870                         free(queryName);
 871
 872                         break;
 873                 }
 874
 875                 case 'v': {
 876                         char *params = NULL;
 877                         char *cmdName = strtok_r(packet, ":;", &params);
 878
 879                         cmdName++; // vCommand -> Command
 880
 881                         if(!strcmp(cmdName, "FlashErase")) {
 882                                 char *__s_addr, *s_length;
 883                                 char *tok = params;
 884
 885                                 __s_addr   = strsep(&tok, ",");
 886                                 s_length = tok;
 887
 888                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 889                                        length = strtoul(s_length, NULL, 16);
 890
 891                                 #if DEBUG
 892                                 printf("FlashErase: addr:%08x,len:%04x\n",
 893                                         addr, length);
 894                                 #endif
 895
 896                                 if(flash_add_block(addr, length, sl) < 0) {
 897                                         reply = strdup("E00");
 898                                 } else {
 899                                         reply = strdup("OK");
 900                                 }
 901                         } else if(!strcmp(cmdName, "FlashWrite")) {
 902                                 char *__s_addr, *data;
 903                                 char *tok = params;
 904
 905                                 __s_addr = strsep(&tok, ":");
 906                                 data   = tok;
 907
 908                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 909                                 unsigned data_length = status - (data - packet);
 910
 911                                 // Length of decoded data cannot be more than
 912                                 // encoded, as escapes are removed.
 913                                 // Additional byte is reserved for alignment fix.
 914                                 uint8_t *decoded = calloc(data_length + 1, 1);
 915                                 unsigned dec_index = 0;
 916                                 for(unsigned int i = 0; i < data_length; i++) {
 917                                         if(data[i] == 0x7d) {
 918                                                 i++;
 919                                                 decoded[dec_index++] = data[i] ^ 0x20;
 920                                         } else {
 921                                                 decoded[dec_index++] = data[i];
 922                                         }
 923                                 }
 924
 925                                 // Fix alignment
 926                                 if(dec_index % 2 != 0)
 927                                         dec_index++;
 928
 929                                 #if DEBUG
 930                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 931                                 #endif
 932
 933                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 934                                         reply = strdup("E00");
 935                                 } else {
 936                                         reply = strdup("OK");
 937                                 }
 938                         } else if(!strcmp(cmdName, "FlashDone")) {
 939                                 if(flash_go(sl) < 0) {
 940                                         reply = strdup("E00");
 941                                 } else {
 942                                         reply = strdup("OK");
 943                                 }
 944                         } else if(!strcmp(cmdName, "Kill")) {
 945                                 attached = 0;
 946
 947                                 reply = strdup("OK");
 948                         }
 949
 950                         if(reply == NULL)
 951                                 reply = strdup("");
 952
 953                         break;
 954                 }
 955
 956                 case 'c':
 957                         stlink_run(sl);
 958
 959                         while(1) {
 960                                 int status = gdb_check_for_interrupt(client);
 961                                 if(status < 0) {
 962                                         fprintf(stderr, "cannot check for int: %d\n", status);
 963                                         return 1;
 964                                 }
 965
 966                                 if(status == 1) {
 967                                         stlink_force_debug(sl);
 968                                         break;
 969                                 }
 970
 971                                 stlink_status(sl);
 972                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 973                                         break;
 974                                 }
 975
 976                                 usleep(100000);
 977                         }
 978
 979                         reply = strdup("S05"); // TRAP
 980                         break;
 981
 982                 case 's':
 983                         stlink_step(sl);
 984
 985                         reply = strdup("S05"); // TRAP
 986                         break;
 987
 988                 case '?':
 989                         if(attached) {
 990                                 reply = strdup("S05"); // TRAP
 991                         } else {
 992                                 /* Stub shall reply OK if not attached. */
 993                                 reply = strdup("OK");
 994                         }
 995                         break;
 996
 997                 case 'g':
 998                         stlink_read_all_regs(sl, &regp);
 999
1000                         reply = calloc(8 * 16 + 1, 1);
1001                         for(int i = 0; i < 16; i++)
1002                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
1003
1004                         break;
1005
1006                 case 'p': {
1007                         unsigned id = strtoul(&packet[1], NULL, 16);
1008                         unsigned myreg = 0xDEADDEAD;
1009
1010                         if(id < 16) {
1011                                 stlink_read_reg(sl, id, &regp);
1012                                 myreg = htonl(regp.r[id]);
1013                         } else if(id == 0x19) {
1014                                 stlink_read_reg(sl, 16, &regp);
1015                                 myreg = htonl(regp.xpsr);
1016                         } else if(id == 0x1A) {
1017                                 stlink_read_reg(sl, 17, &regp);
1018                                 myreg = htonl(regp.main_sp);
1019                         } else if(id == 0x1B) {
1020                                 stlink_read_reg(sl, 18, &regp);
1021                                 myreg = htonl(regp.process_sp);
1022                         } else if(id == 0x1C) {
1023                                 stlink_read_unsupported_reg(sl, id, &regp);
1024                                 myreg = htonl(regp.control);
1025                         } else if(id == 0x1D) {
1026                                 stlink_read_unsupported_reg(sl, id, &regp);
1027                                 myreg = htonl(regp.faultmask);
1028                         } else if(id == 0x1E) {
1029                                 stlink_read_unsupported_reg(sl, id, &regp);
1030                                 myreg = htonl(regp.basepri);
1031                         } else if(id == 0x1F) {
1032                                 stlink_read_unsupported_reg(sl, id, &regp);
1033                                 myreg = htonl(regp.primask);
1034             } else if(id >= 0x20 && id < 0x40) {
1035                 stlink_read_unsupported_reg(sl, id, &regp);
1036                 myreg = htonl(regp.s[id-0x20]);
1037                         } else if(id == 0x40) {
1038                 stlink_read_unsupported_reg(sl, id, &regp);
1039                 myreg = htonl(regp.fpscr);
1040                         } else {
1041                                 reply = strdup("E00");
1042                         }
1043
1044                         reply = calloc(8 + 1, 1);
1045                         sprintf(reply, "%08x", myreg);
1046
1047                         break;
1048                 }
1049
1050                 case 'P': {
1051                         char* s_reg = &packet[1];
1052                         char* s_value = strstr(&packet[1], "=") + 1;
1053
1054                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1055                         unsigned value = strtoul(s_value, NULL, 16);
1056
1057                         if(reg < 16) {
1058                                 stlink_write_reg(sl, ntohl(value), reg);
1059                         } else if(reg == 0x19) {
1060                                 stlink_write_reg(sl, ntohl(value), 16);
1061                         } else if(reg == 0x1A) {
1062                                 stlink_write_reg(sl, ntohl(value), 17);
1063                         } else if(reg == 0x1B) {
1064                                 stlink_write_reg(sl, ntohl(value), 18);
1065                         } else if(reg == 0x1C) {
1066                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1067                         } else if(reg == 0x1D) {
1068                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1069                         } else if(reg == 0x1E) {
1070                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1071                         } else if(reg == 0x1F) {
1072                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1073             } else if(reg >= 0x20 && reg < 0x40) {
1074                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1075                         } else if(reg == 0x40) {
1076                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1077                         } else {
1078                                 reply = strdup("E00");
1079                         }
1080
1081                         if(!reply) {
1082                                 reply = strdup("OK");
1083                         }
1084
1085                         break;
1086                 }
1087
1088                 case 'G':
1089                         for(int i = 0; i < 16; i++) {
1090                                 char str[9] = {0};
1091                                 strncpy(str, &packet[1 + i * 8], 8);
1092                                 uint32_t reg = strtoul(str, NULL, 16);
1093                                 stlink_write_reg(sl, ntohl(reg), i);
1094                         }
1095
1096                         reply = strdup("OK");
1097                         break;
1098
1099                 case 'm': {
1100                         char* s_start = &packet[1];
1101                         char* s_count = strstr(&packet[1], ",") + 1;
1102
1103                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1104                         unsigned     count = strtoul(s_count, NULL, 16);
1105
1106                         unsigned adj_start = start % 4;
1107                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1108
1109                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1110
1111                         reply = calloc(count * 2 + 1, 1);
1112                         for(unsigned int i = 0; i < count; i++) {
1113                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1114                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1115                         }
1116
1117                         break;
1118                 }
1119
1120                 case 'M': {
1121                         char* s_start = &packet[1];
1122                         char* s_count = strstr(&packet[1], ",") + 1;
1123                         char* hexdata = strstr(packet, ":") + 1;
1124
1125                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1126                         unsigned     count = strtoul(s_count, NULL, 16);
1127
1128                         if(start % 4) {
1129                           unsigned align_count = 4 - start % 4;
1130                           if (align_count > count) align_count = count;
1131                           for(unsigned int i = 0; i < align_count; i ++) {
1132                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1133                                 uint8_t byte = strtoul(hex, NULL, 16);
1134                                 sl->q_buf[i] = byte;
1135                           }
1136                           stlink_write_mem8(sl, start, align_count);
1137                           start += align_count;
1138                           count -= align_count;
1139                           hexdata += 2*align_count;
1140                         }
1141
1142                         if(count - count % 4) {
1143                           unsigned aligned_count = count - count % 4;
1144
1145                           for(unsigned int i = 0; i < aligned_count; i ++) {
1146                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1147                             uint8_t byte = strtoul(hex, NULL, 16);
1148                             sl->q_buf[i] = byte;
1149                           }
1150                           stlink_write_mem32(sl, start, aligned_count);
1151                           count -= aligned_count;
1152                           start += aligned_count;
1153                           hexdata += 2*aligned_count;
1154                         }
1155
1156                         if(count) {
1157                           for(unsigned int i = 0; i < count; i ++) {
1158                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1159                             uint8_t byte = strtoul(hex, NULL, 16);
1160                             sl->q_buf[i] = byte;
1161                           }
1162                           stlink_write_mem8(sl, start, count);
1163                         }
1164                         reply = strdup("OK");
1165                         break;
1166                 }
1167
1168                 case 'Z': {
1169                         char *endptr;
1170                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1171                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1172
1173                         switch (packet[1]) {
1174                                 case '1':
1175                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1176                                         reply = strdup("E00");
1177                                 } else {
1178                                         reply = strdup("OK");
1179                                 }
1180                                 break;
1181
1182                                 case '2':   // insert write watchpoint
1183                                 case '3':   // insert read  watchpoint
1184                                 case '4':   // insert access watchpoint
1185                                 {
1186                                         enum watchfun wf;
1187                                         if(packet[1] == '2') {
1188                                                 wf = WATCHWRITE;
1189                                         } else if(packet[1] == '3') {
1190                                                 wf = WATCHREAD;
1191                                         } else {
1192                                                 wf = WATCHACCESS;
1193                                         }
1194
1195                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1196                         reply = strdup("E00");
1197                     } else {
1198                         reply = strdup("OK");
1199                         break;
1200                     }
1201                                 }
1202
1203                                 default:
1204                                 reply = strdup("");
1205                         }
1206                         break;
1207                 }
1208                 case 'z': {
1209                         char *endptr;
1210                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1211                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1212
1213                         switch (packet[1]) {
1214                                 case '1': // remove breakpoint
1215                                 update_code_breakpoint(sl, addr, 0);
1216                                 reply = strdup("OK");
1217                                 break;
1218
1219                                 case '2' : // remove write watchpoint
1220                                 case '3' : // remove read watchpoint
1221                                 case '4' : // remove access watchpoint
1222                                 if(delete_data_watchpoint(sl, addr) < 0) {
1223                                         reply = strdup("E00");
1224                                 } else {
1225                                         reply = strdup("OK");
1226                                         break;
1227                                 }
1228
1229                                 default:
1230                                 reply = strdup("");
1231                         }
1232                         break;
1233                 }
1234
1235                 case '!': {
1236                         /*
1237                          * Enter extended mode which allows restarting.
1238                          * We do support that always.
1239                          */
1240
1241                         /*
1242                          * Also, set to persistent mode
1243                          * to allow GDB disconnect.
1244                          */
1245                         st->persistent = 1;
1246
1247                         reply = strdup("OK");
1248
1249                         break;
1250                 }
1251
1252                 case 'R': {
1253                         /* Reset the core. */
1254
1255                         stlink_reset(sl);
1256                         init_code_breakpoints(sl);
1257                         init_data_watchpoints(sl);
1258
1259                         attached = 1;
1260
1261                         reply = strdup("OK");
1262
1263                         break;
1264                 }
1265
1266                 default:
1267                         reply = strdup("");
1268                 }
1269
1270                 if(reply) {
1271                         #if DEBUG
1272                         printf("send: %s\n", reply);
1273                         #endif
1274
1275                         int result = gdb_send_packet(client, reply);
1276                         if(result != 0) {
1277                                 fprintf(stderr, "cannot send: %d\n", result);
1278                                 free(reply);
1279                                 free(packet);
1280                                 return 1;
1281                         }
1282
1283                         free(reply);
1284                 }
1285
1286                 free(packet);
1287         }
1288
1289         return 0;
1290 }