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     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  49     char devicename[100];
  50     int logging_level;
  51         int listen_port;
  52     int persistent;
  53     int reset;
  54 } st_state_t;
  55
  56
  57 int serve(stlink_t *sl, st_state_t *st);
  58 char* make_memory_map(stlink_t *sl);
  59
  60 static void cleanup(int signal __attribute__((unused))) {
  61     if (connected_stlink) {
  62         /* Switch back to mass storage mode before closing. */
  63         stlink_run(connected_stlink);
  64         stlink_exit_debug_mode(connected_stlink);
  65         stlink_close(connected_stlink);
  66     }
  67
  68     exit(1);
  69 }
  70
  71
  72
  73 int parse_options(int argc, char** argv, st_state_t *st) {
  74     static struct option long_options[] = {
  75         {"help", no_argument, NULL, 'h'},
  76         {"verbose", optional_argument, NULL, 'v'},
  77         {"device", required_argument, NULL, 'd'},
  78         {"stlink_version", required_argument, NULL, 's'},
  79         {"stlinkv1", no_argument, NULL, '1'},
  80                 {"listen_port", required_argument, NULL, 'p'},
  81                 {"multi", optional_argument, NULL, 'm'},
  82                 {"no-reset", optional_argument, NULL, 'n'},
  83         {0, 0, 0, 0},
  84     };
  85         const char * help_str = "%s - usage:\n\n"
  86         "  -h, --help\t\tPrint this help\n"
  87         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  88         "  -v, --verbose\tspecify generally verbose logging\n"
  89         "  -d <device>, --device=/dev/stlink2_1\n"
  90         "\t\t\tWhere is your stlink device connected?\n"
  91         "  -s X, --stlink_version=X\n"
  92         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  93         "  -1, --stlinkv1\tForce stlink version 1\n"
  94         "  -p 4242, --listen_port=1234\n"
  95         "\t\t\tSet the gdb server listen port. "
  96         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  97     "  -m, --multi\n"
  98     "\t\t\tSet gdb server to extended mode.\n"
  99     "\t\t\tst-util will continue listening for connections after disconnect.\n"
 100     "  -n, --no-reset\n"
 101     "\t\t\tDo not reset board on connection.\n"
 102         ;
 103
 104
 105     int option_index = 0;
 106     int c;
 107     int q;
 108     while ((c = getopt_long(argc, argv, "hv::d:s:1p:mn", long_options, &option_index)) != -1) {
 109         switch (c) {
 110         case 0:
 111             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 112             printf("option %s", long_options[option_index].name);
 113             if (optarg) {
 114                 printf(" with arg %s", optarg);
 115             }
 116             printf("\n");
 117             break;
 118         case 'h':
 119             printf(help_str, argv[0]);
 120             exit(EXIT_SUCCESS);
 121             break;
 122         case 'v':
 123             if (optarg) {
 124                 st->logging_level = atoi(optarg);
 125             } else {
 126                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 127             }
 128             break;
 129         case 'd':
 130             if (strlen(optarg) > sizeof (st->devicename)) {
 131                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 132             } else {
 133                 strcpy(st->devicename, optarg);
 134             }
 135             break;
 136                 case '1':
 137                         st->stlink_version = 1;
 138                         break;
 139                 case 's':
 140                         sscanf(optarg, "%i", &q);
 141                         if (q < 0 || q > 2) {
 142                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 143                                 exit(EXIT_FAILURE);
 144                         }
 145                         st->stlink_version = q;
 146                         break;
 147                 case 'p':
 148                         sscanf(optarg, "%i", &q);
 149                         if (q < 0) {
 150                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 151                                 exit(EXIT_FAILURE);
 152                         }
 153                         st->listen_port = q;
 154                         break;
 155                 case 'm':
 156                         st->persistent = 1;
 157                         break;
 158                 case 'n':
 159                         st->reset = 0;
 160                         break;
 161         }
 162     }
 163
 164     if (optind < argc) {
 165         printf("non-option ARGV-elements: ");
 166         while (optind < argc)
 167             printf("%s ", argv[optind++]);
 168         printf("\n");
 169     }
 170     return 0;
 171 }
 172
 173
 174 int main(int argc, char** argv) {
 175         int32_t voltage;
 176
 177         stlink_t *sl = NULL;
 178
 179         st_state_t state;
 180         memset(&state, 0, sizeof(state));
 181         // set defaults...
 182         state.stlink_version = 2;
 183         state.logging_level = DEFAULT_LOGGING_LEVEL;
 184         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 185         state.reset = 1;    /* By default, reset board */
 186         parse_options(argc, argv, &state);
 187         switch (state.stlink_version) {
 188         case 2:
 189                 sl = stlink_open_usb(state.logging_level, 0);
 190                 if(sl == NULL) return 1;
 191                 break;
 192         case 1:
 193                 sl = stlink_v1_open(state.logging_level, 0);
 194                 if(sl == NULL) return 1;
 195                 break;
 196     }
 197
 198     connected_stlink = sl;
 199     signal(SIGINT, &cleanup);
 200     signal(SIGTERM, &cleanup);
 201
 202     if (state.reset) {
 203                 stlink_reset(sl);
 204     }
 205
 206         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 207
 208         voltage = stlink_target_voltage(sl);
 209         if (voltage != -1) {
 210                 printf("Target voltage is %d mV.\n", voltage);
 211         }
 212
 213         sl->verbose=0;
 214
 215         current_memory_map = make_memory_map(sl);
 216
 217 #ifdef __MINGW32__
 218         WSADATA wsadata;
 219         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 220                 goto winsock_error;
 221         }
 222 #endif
 223
 224         do {
 225                 serve(sl, &state);
 226
 227                 /* Continue */
 228                 stlink_run(sl);
 229         } while (state.persistent);
 230
 231 #ifdef __MINGW32__
 232 winsock_error:
 233         WSACleanup();
 234 #endif
 235
 236         /* Switch back to mass storage mode before closing. */
 237         stlink_exit_debug_mode(sl);
 238         stlink_close(sl);
 239
 240         return 0;
 241 }
 242
 243 static const char* const target_description_F4 =
 244     "<?xml version=\"1.0\"?>"
 245     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 246     "<target version=\"1.0\">"
 247     "   <architecture>arm</architecture>"
 248     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 249     "       <reg name=\"r0\" bitsize=\"32\"/>"
 250     "       <reg name=\"r1\" bitsize=\"32\"/>"
 251     "       <reg name=\"r2\" bitsize=\"32\"/>"
 252     "       <reg name=\"r3\" bitsize=\"32\"/>"
 253     "       <reg name=\"r4\" bitsize=\"32\"/>"
 254     "       <reg name=\"r5\" bitsize=\"32\"/>"
 255     "       <reg name=\"r6\" bitsize=\"32\"/>"
 256     "       <reg name=\"r7\" bitsize=\"32\"/>"
 257     "       <reg name=\"r8\" bitsize=\"32\"/>"
 258     "       <reg name=\"r9\" bitsize=\"32\"/>"
 259     "       <reg name=\"r10\" bitsize=\"32\"/>"
 260     "       <reg name=\"r11\" bitsize=\"32\"/>"
 261     "       <reg name=\"r12\" bitsize=\"32\"/>"
 262     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 263     "       <reg name=\"lr\" bitsize=\"32\"/>"
 264     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 265     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 266     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 267     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 268     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 269     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 270     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 271     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 272     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 285     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 286     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 287     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 288     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 289     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 290     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 291     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 292     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 293     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 294     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 295     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 296     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 297     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 298     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 299     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 300     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 301     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 302     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 303     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 304     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 305     "   </feature>"
 306     "</target>";
 307
 308 static const char* const memory_map_template_F4 =
 309   "<?xml version=\"1.0\"?>"
 310   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 311   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 312   "<memory-map>"
 313   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 314   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 315   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 316   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 317   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 318   "  </memory>"
 319   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 320   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 321   "  </memory>"
 322   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 323   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 324   "  </memory>"
 325   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 326   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 327   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 328   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 329   "</memory-map>";
 330
 331 static const char* const memory_map_template =
 332   "<?xml version=\"1.0\"?>"
 333   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 334   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 335   "<memory-map>"
 336   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 337   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 338   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 339   "    <property name=\"blocksize\">0x%zx</property>"
 340   "  </memory>"
 341   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 342   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 343   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 344   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 345   "</memory-map>";
 346
 347 char* make_memory_map(stlink_t *sl) {
 348         /* This will be freed in serve() */
 349         char* map = malloc(4096);
 350         map[0] = '\0';
 351
 352         if(sl->chip_id==STM32_CHIPID_F4) {
 353         strcpy(map, memory_map_template_F4);
 354     } else {
 355         snprintf(map, 4096, memory_map_template,
 356                         sl->flash_size,
 357                         sl->sram_size,
 358                         sl->flash_size, sl->flash_pgsz,
 359                         sl->sys_base, sl->sys_size);
 360     }
 361         return map;
 362 }
 363
 364
 365 /*
 366  * DWT_COMP0     0xE0001020
 367  * DWT_MASK0     0xE0001024
 368  * DWT_FUNCTION0 0xE0001028
 369  * DWT_COMP1     0xE0001030
 370  * DWT_MASK1     0xE0001034
 371  * DWT_FUNCTION1 0xE0001038
 372  * DWT_COMP2     0xE0001040
 373  * DWT_MASK2     0xE0001044
 374  * DWT_FUNCTION2 0xE0001048
 375  * DWT_COMP3     0xE0001050
 376  * DWT_MASK3     0xE0001054
 377  * DWT_FUNCTION3 0xE0001058
 378  */
 379
 380 #define DATA_WATCH_NUM 4
 381
 382 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 383
 384 struct code_hw_watchpoint {
 385         stm32_addr_t addr;
 386         uint8_t mask;
 387         enum watchfun fun;
 388 };
 389
 390 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 391
 392 static void init_data_watchpoints(stlink_t *sl) {
 393         #if DEBUG
 394         printf("init watchpoints\n");
 395         #endif
 396
 397         // set trcena in debug command to turn on dwt unit
 398         stlink_write_debug32(sl, 0xE000EDFC,
 399                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 400
 401         // make sure all watchpoints are cleared
 402         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 403                 data_watches[i].fun = WATCHDISABLED;
 404                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 405         }
 406 }
 407
 408 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 409 {
 410         int i = 0;
 411         uint32_t mask;
 412
 413         // computer mask
 414         // find a free watchpoint
 415         // configure
 416
 417         mask = -1;
 418         i = len;
 419         while(i) {
 420                 i >>= 1;
 421                 mask++;
 422         }
 423
 424         if((mask != (uint32_t)-1) && (mask < 16)) {
 425                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 426                         // is this an empty slot ?
 427                         if(data_watches[i].fun == WATCHDISABLED) {
 428                                 #if DEBUG
 429                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 430                                 #endif
 431
 432                                 data_watches[i].fun = wf;
 433                                 data_watches[i].addr = addr;
 434                                 data_watches[i].mask = mask;
 435
 436                                 // insert comparator address
 437                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 438
 439                                 // insert mask
 440                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 441
 442                                 // insert function
 443                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 444
 445                                 // just to make sure the matched bit is clear !
 446                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 447                                 return 0;
 448                         }
 449                 }
 450         }
 451
 452         #if DEBUG
 453         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 454         #endif
 455         return -1;
 456 }
 457
 458 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 459 {
 460         int i;
 461
 462         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 463                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 464                         #if DEBUG
 465                         printf("delete watchpoint %d addr %x\n", i, addr);
 466                         #endif
 467
 468                         data_watches[i].fun = WATCHDISABLED;
 469                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 470
 471                         return 0;
 472                 }
 473         }
 474
 475         #if DEBUG
 476         printf("failure: delete watchpoint addr %x\n", addr);
 477         #endif
 478
 479         return -1;
 480 }
 481
 482 #define CODE_BREAK_NUM  6
 483 #define CODE_BREAK_LOW  0x01
 484 #define CODE_BREAK_HIGH 0x02
 485
 486 struct code_hw_breakpoint {
 487         stm32_addr_t addr;
 488         int          type;
 489 };
 490
 491 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 492
 493 static void init_code_breakpoints(stlink_t *sl) {
 494         memset(sl->q_buf, 0, 4);
 495         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 496         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 497         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 498
 499         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 500                 code_breaks[i].type = 0;
 501                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 502         }
 503 }
 504
 505 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 506         stm32_addr_t fpb_addr = addr & ~0x3;
 507         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 508
 509         if(addr & 1) {
 510                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 511                 return -1;
 512         }
 513
 514         int id = -1;
 515         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 516                 if(fpb_addr == code_breaks[i].addr ||
 517                         (set && code_breaks[i].type == 0)) {
 518                         id = i;
 519                         break;
 520                 }
 521         }
 522
 523         if(id == -1) {
 524                 if(set) return -1; // Free slot not found
 525                 else    return 0;  // Breakpoint is already removed
 526         }
 527
 528         struct code_hw_breakpoint* brk = &code_breaks[id];
 529
 530         brk->addr = fpb_addr;
 531
 532         if(set) brk->type |= type;
 533         else    brk->type &= ~type;
 534
 535         if(brk->type == 0) {
 536                 #if DEBUG
 537                 printf("clearing hw break %d\n", id);
 538                 #endif
 539
 540                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 541         } else {
 542                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 543
 544                 #if DEBUG
 545                 printf("setting hw break %d at %08x (%d)\n",
 546                         id, brk->addr, brk->type);
 547                 printf("reg %08x \n",
 548                         mask);
 549                 #endif
 550
 551                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 552         }
 553
 554         return 0;
 555 }
 556
 557
 558 struct flash_block {
 559         stm32_addr_t addr;
 560         unsigned     length;
 561         uint8_t*     data;
 562
 563         struct flash_block* next;
 564 };
 565
 566 static struct flash_block* flash_root;
 567
 568 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 569
 570         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 571                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 572                 return -1;
 573         }
 574
 575         stlink_calculate_pagesize(sl, addr);
 576         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 577                 fprintf(stderr, "flash_add_block: unaligned block\n");
 578                 return -1;
 579         }
 580
 581         struct flash_block* new = malloc(sizeof(struct flash_block));
 582         new->next = flash_root;
 583
 584         new->addr   = addr;
 585         new->length = length;
 586         new->data   = calloc(length, 1);
 587
 588         flash_root = new;
 589
 590         return 0;
 591 }
 592
 593 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 594         unsigned int fit_blocks = 0, fit_length = 0;
 595
 596         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 597                 /* Block: ------X------Y--------
 598                  * Data:            a-----b
 599                  *                a--b
 600                  *            a-----------b
 601                  * Block intersects with data, if:
 602                  *  a < Y && b > x
 603                  */
 604
 605                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 606                 unsigned a = addr, b = addr + length;
 607                 if(a < Y && b > X) {
 608                         // from start of the block
 609                         unsigned start = (a > X ? a : X) - X;
 610                         unsigned end   = (b > Y ? Y : b) - X;
 611
 612                         memcpy(fb->data + start, data, end - start);
 613
 614                         fit_blocks++;
 615                         fit_length += end - start;
 616                 }
 617         }
 618
 619         if(fit_blocks == 0) {
 620                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 621                 return -1;
 622         }
 623
 624         if(fit_length != length) {
 625                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 626                         addr, length, fit_length);
 627                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 628         }
 629
 630         return 0;
 631 }
 632
 633 static int flash_go(stlink_t *sl) {
 634         int error = -1;
 635
 636         // Some kinds of clock settings do not allow writing to flash.
 637         stlink_reset(sl);
 638
 639         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 640                 #if DEBUG
 641                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 642                 #endif
 643
 644                 unsigned length = fb->length;
 645                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 646
 647                         //Update FLASH_PAGE
 648                         stlink_calculate_pagesize(sl, page);
 649
 650                         #if DEBUG
 651                         printf("flash_do: page %08x\n", page);
 652                         #endif
 653
 654                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 655                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 656                                 goto error;
 657                         }
 658         }
 659
 660         stlink_reset(sl);
 661
 662         error = 0;
 663
 664 error:
 665         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 666                 next = fb->next;
 667                 free(fb->data);
 668                 free(fb);
 669         }
 670
 671         flash_root = NULL;
 672
 673         return error;
 674 }
 675
 676 int serve(stlink_t *sl, st_state_t *st) {
 677         int sock = socket(AF_INET, SOCK_STREAM, 0);
 678         if(sock < 0) {
 679                 perror("socket");
 680                 return 1;
 681         }
 682
 683         unsigned int val = 1;
 684         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 685
 686         struct sockaddr_in serv_addr;
 687         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 688         serv_addr.sin_family = AF_INET;
 689         serv_addr.sin_addr.s_addr = INADDR_ANY;
 690         serv_addr.sin_port = htons(st->listen_port);
 691
 692         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 693                 perror("bind");
 694                 return 1;
 695         }
 696
 697         if(listen(sock, 5) < 0) {
 698                 perror("listen");
 699                 return 1;
 700         }
 701
 702         printf("Listening at *:%d...\n", st->listen_port);
 703
 704         int client = accept(sock, NULL, NULL);
 705         //signal (SIGINT, SIG_DFL);
 706         if(client < 0) {
 707                 perror("accept");
 708                 return 1;
 709         }
 710
 711         close(sock);
 712
 713         stlink_force_debug(sl);
 714         if (st->reset) {
 715                 stlink_reset(sl);
 716     }
 717         init_code_breakpoints(sl);
 718         init_data_watchpoints(sl);
 719
 720         printf("GDB connected.\n");
 721
 722         /*
 723          * To allow resetting the chip from GDB it is required to
 724          * emulate attaching and detaching to target.
 725          */
 726         unsigned int attached = 1;
 727
 728         while(1) {
 729                 char* packet;
 730
 731                 int status = gdb_recv_packet(client, &packet);
 732                 if(status < 0) {
 733                         fprintf(stderr, "cannot recv: %d\n", status);
 734                         return 1;
 735                 }
 736
 737                 #if DEBUG
 738                 printf("recv: %s\n", packet);
 739                 #endif
 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                         #if DEBUG
 763                         printf("query: %s;%s\n", queryName, params);
 764                         #endif
 765
 766                         if(!strcmp(queryName, "Supported")) {
 767                 if(sl->chip_id==STM32_CHIPID_F4) {
 768                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 769                 }
 770                 else {
 771                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 772                 }
 773                         } else if(!strcmp(queryName, "Xfer")) {
 774                                 char *type, *op, *__s_addr, *s_length;
 775                                 char *tok = params;
 776                                 char *annex __attribute__((unused));
 777
 778                                 type     = strsep(&tok, ":");
 779                                 op       = strsep(&tok, ":");
 780                                 annex    = strsep(&tok, ":");
 781                                 __s_addr   = strsep(&tok, ",");
 782                                 s_length = tok;
 783
 784                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 785                                        length = strtoul(s_length, NULL, 16);
 786
 787                                 #if DEBUG
 788                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 789                                         type, op, annex, addr, length);
 790                                 #endif
 791
 792                                 const char* data = NULL;
 793
 794                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 795                                         data = current_memory_map;
 796
 797                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 798                                         data = target_description_F4;
 799
 800                                 if(data) {
 801                                         unsigned data_length = strlen(data);
 802                                         if(addr + length > data_length)
 803                                                 length = data_length - addr;
 804
 805                                         if(length == 0) {
 806                                                 reply = strdup("l");
 807                                         } else {
 808                                                 reply = calloc(length + 2, 1);
 809                                                 reply[0] = 'm';
 810                                                 strncpy(&reply[1], data, length);
 811                                         }
 812                                 }
 813                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 814                                 // Rcmd uses the wrong separator
 815                                 char *separator = strstr(packet, ","), *params = "";
 816                                 if(separator == NULL) {
 817                                         separator = packet + strlen(packet);
 818                                 } else {
 819                                         params = separator + 1;
 820                                 }
 821
 822
 823                                 if (!strncmp(params,"726573756d65",12)) {// resume
 824 #if DEBUG
 825                                         printf("Rcmd: resume\n");
 826 #endif
 827                                         stlink_run(sl);
 828
 829                                         reply = strdup("OK");
 830                 } else if (!strncmp(params,"68616c74",8)) { //halt
 831                                         reply = strdup("OK");
 832
 833                                         stlink_force_debug(sl);
 834
 835 #if DEBUG
 836                                         printf("Rcmd: halt\n");
 837 #endif
 838                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 839                                         reply = strdup("OK");
 840
 841                                         stlink_jtag_reset(sl, 1);
 842                                         stlink_jtag_reset(sl, 0);
 843                                         stlink_force_debug(sl);
 844
 845 #if DEBUG
 846                                         printf("Rcmd: jtag_reset\n");
 847 #endif
 848                 } else if (!strncmp(params,"7265736574",10)) { //reset
 849                                         reply = strdup("OK");
 850
 851                                         stlink_force_debug(sl);
 852                                         stlink_reset(sl);
 853                                         init_code_breakpoints(sl);
 854                                         init_data_watchpoints(sl);
 855
 856 #if DEBUG
 857                                         printf("Rcmd: reset\n");
 858 #endif
 859                                 } else {
 860 #if DEBUG
 861                                         printf("Rcmd: %s\n", params);
 862 #endif
 863
 864                                 }
 865
 866                         }
 867
 868                         if(reply == NULL)
 869                                 reply = strdup("");
 870
 871                         free(queryName);
 872
 873                         break;
 874                 }
 875
 876                 case 'v': {
 877                         char *params = NULL;
 878                         char *cmdName = strtok_r(packet, ":;", &params);
 879
 880                         cmdName++; // vCommand -> Command
 881
 882                         if(!strcmp(cmdName, "FlashErase")) {
 883                                 char *__s_addr, *s_length;
 884                                 char *tok = params;
 885
 886                                 __s_addr   = strsep(&tok, ",");
 887                                 s_length = tok;
 888
 889                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 890                                        length = strtoul(s_length, NULL, 16);
 891
 892                                 #if DEBUG
 893                                 printf("FlashErase: addr:%08x,len:%04x\n",
 894                                         addr, length);
 895                                 #endif
 896
 897                                 if(flash_add_block(addr, length, sl) < 0) {
 898                                         reply = strdup("E00");
 899                                 } else {
 900                                         reply = strdup("OK");
 901                                 }
 902                         } else if(!strcmp(cmdName, "FlashWrite")) {
 903                                 char *__s_addr, *data;
 904                                 char *tok = params;
 905
 906                                 __s_addr = strsep(&tok, ":");
 907                                 data   = tok;
 908
 909                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 910                                 unsigned data_length = status - (data - packet);
 911
 912                                 // Length of decoded data cannot be more than
 913                                 // encoded, as escapes are removed.
 914                                 // Additional byte is reserved for alignment fix.
 915                                 uint8_t *decoded = calloc(data_length + 1, 1);
 916                                 unsigned dec_index = 0;
 917                                 for(unsigned int i = 0; i < data_length; i++) {
 918                                         if(data[i] == 0x7d) {
 919                                                 i++;
 920                                                 decoded[dec_index++] = data[i] ^ 0x20;
 921                                         } else {
 922                                                 decoded[dec_index++] = data[i];
 923                                         }
 924                                 }
 925
 926                                 // Fix alignment
 927                                 if(dec_index % 2 != 0)
 928                                         dec_index++;
 929
 930                                 #if DEBUG
 931                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 932                                 #endif
 933
 934                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 935                                         reply = strdup("E00");
 936                                 } else {
 937                                         reply = strdup("OK");
 938                                 }
 939                         } else if(!strcmp(cmdName, "FlashDone")) {
 940                                 if(flash_go(sl) < 0) {
 941                                         reply = strdup("E00");
 942                                 } else {
 943                                         reply = strdup("OK");
 944                                 }
 945                         } else if(!strcmp(cmdName, "Kill")) {
 946                                 attached = 0;
 947
 948                                 reply = strdup("OK");
 949                         }
 950
 951                         if(reply == NULL)
 952                                 reply = strdup("");
 953
 954                         break;
 955                 }
 956
 957                 case 'c':
 958                         stlink_run(sl);
 959
 960                         while(1) {
 961                                 int status = gdb_check_for_interrupt(client);
 962                                 if(status < 0) {
 963                                         fprintf(stderr, "cannot check for int: %d\n", status);
 964                                         return 1;
 965                                 }
 966
 967                                 if(status == 1) {
 968                                         stlink_force_debug(sl);
 969                                         break;
 970                                 }
 971
 972                                 stlink_status(sl);
 973                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 974                                         break;
 975                                 }
 976
 977                                 usleep(100000);
 978                         }
 979
 980                         reply = strdup("S05"); // TRAP
 981                         break;
 982
 983                 case 's':
 984                         stlink_step(sl);
 985
 986                         reply = strdup("S05"); // TRAP
 987                         break;
 988
 989                 case '?':
 990                         if(attached) {
 991                                 reply = strdup("S05"); // TRAP
 992                         } else {
 993                                 /* Stub shall reply OK if not attached. */
 994                                 reply = strdup("OK");
 995                         }
 996                         break;
 997
 998                 case 'g':
 999                         stlink_read_all_regs(sl, &regp);
1000
1001                         reply = calloc(8 * 16 + 1, 1);
1002                         for(int i = 0; i < 16; i++)
1003                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
1004
1005                         break;
1006
1007                 case 'p': {
1008                         unsigned id = strtoul(&packet[1], NULL, 16);
1009                         unsigned myreg = 0xDEADDEAD;
1010
1011                         if(id < 16) {
1012                                 stlink_read_reg(sl, id, &regp);
1013                                 myreg = htonl(regp.r[id]);
1014                         } else if(id == 0x19) {
1015                                 stlink_read_reg(sl, 16, &regp);
1016                                 myreg = htonl(regp.xpsr);
1017                         } else if(id == 0x1A) {
1018                                 stlink_read_reg(sl, 17, &regp);
1019                                 myreg = htonl(regp.main_sp);
1020                         } else if(id == 0x1B) {
1021                                 stlink_read_reg(sl, 18, &regp);
1022                                 myreg = htonl(regp.process_sp);
1023                         } else if(id == 0x1C) {
1024                                 stlink_read_unsupported_reg(sl, id, &regp);
1025                                 myreg = htonl(regp.control);
1026                         } else if(id == 0x1D) {
1027                                 stlink_read_unsupported_reg(sl, id, &regp);
1028                                 myreg = htonl(regp.faultmask);
1029                         } else if(id == 0x1E) {
1030                                 stlink_read_unsupported_reg(sl, id, &regp);
1031                                 myreg = htonl(regp.basepri);
1032                         } else if(id == 0x1F) {
1033                                 stlink_read_unsupported_reg(sl, id, &regp);
1034                                 myreg = htonl(regp.primask);
1035             } else if(id >= 0x20 && id < 0x40) {
1036                 stlink_read_unsupported_reg(sl, id, &regp);
1037                 myreg = htonl(regp.s[id-0x20]);
1038                         } else if(id == 0x40) {
1039                 stlink_read_unsupported_reg(sl, id, &regp);
1040                 myreg = htonl(regp.fpscr);
1041                         } else {
1042                                 reply = strdup("E00");
1043                         }
1044
1045                         reply = calloc(8 + 1, 1);
1046                         sprintf(reply, "%08x", myreg);
1047
1048                         break;
1049                 }
1050
1051                 case 'P': {
1052                         char* s_reg = &packet[1];
1053                         char* s_value = strstr(&packet[1], "=") + 1;
1054
1055                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1056                         unsigned value = strtoul(s_value, NULL, 16);
1057
1058                         if(reg < 16) {
1059                                 stlink_write_reg(sl, ntohl(value), reg);
1060                         } else if(reg == 0x19) {
1061                                 stlink_write_reg(sl, ntohl(value), 16);
1062                         } else if(reg == 0x1A) {
1063                                 stlink_write_reg(sl, ntohl(value), 17);
1064                         } else if(reg == 0x1B) {
1065                                 stlink_write_reg(sl, ntohl(value), 18);
1066                         } else if(reg == 0x1C) {
1067                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1068                         } else if(reg == 0x1D) {
1069                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1070                         } else if(reg == 0x1E) {
1071                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1072                         } else if(reg == 0x1F) {
1073                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1074             } else if(reg >= 0x20 && reg < 0x40) {
1075                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1076                         } else if(reg == 0x40) {
1077                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1078                         } else {
1079                                 reply = strdup("E00");
1080                         }
1081
1082                         if(!reply) {
1083                                 reply = strdup("OK");
1084                         }
1085
1086                         break;
1087                 }
1088
1089                 case 'G':
1090                         for(int i = 0; i < 16; i++) {
1091                                 char str[9] = {0};
1092                                 strncpy(str, &packet[1 + i * 8], 8);
1093                                 uint32_t reg = strtoul(str, NULL, 16);
1094                                 stlink_write_reg(sl, ntohl(reg), i);
1095                         }
1096
1097                         reply = strdup("OK");
1098                         break;
1099
1100                 case 'm': {
1101                         char* s_start = &packet[1];
1102                         char* s_count = strstr(&packet[1], ",") + 1;
1103
1104                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1105                         unsigned     count = strtoul(s_count, NULL, 16);
1106
1107                         unsigned adj_start = start % 4;
1108                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1109
1110                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1111
1112                         reply = calloc(count * 2 + 1, 1);
1113                         for(unsigned int i = 0; i < count; i++) {
1114                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1115                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1116                         }
1117
1118                         break;
1119                 }
1120
1121                 case 'M': {
1122                         char* s_start = &packet[1];
1123                         char* s_count = strstr(&packet[1], ",") + 1;
1124                         char* hexdata = strstr(packet, ":") + 1;
1125
1126                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1127                         unsigned     count = strtoul(s_count, NULL, 16);
1128
1129                         if(start % 4) {
1130                           unsigned align_count = 4 - start % 4;
1131                           if (align_count > count) align_count = count;
1132                           for(unsigned int i = 0; i < align_count; i ++) {
1133                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1134                                 uint8_t byte = strtoul(hex, NULL, 16);
1135                                 sl->q_buf[i] = byte;
1136                           }
1137                           stlink_write_mem8(sl, start, align_count);
1138                           start += align_count;
1139                           count -= align_count;
1140                           hexdata += 2*align_count;
1141                         }
1142
1143                         if(count - count % 4) {
1144                           unsigned aligned_count = count - count % 4;
1145
1146                           for(unsigned int i = 0; i < aligned_count; i ++) {
1147                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1148                             uint8_t byte = strtoul(hex, NULL, 16);
1149                             sl->q_buf[i] = byte;
1150                           }
1151                           stlink_write_mem32(sl, start, aligned_count);
1152                           count -= aligned_count;
1153                           start += aligned_count;
1154                           hexdata += 2*aligned_count;
1155                         }
1156
1157                         if(count) {
1158                           for(unsigned int i = 0; i < count; i ++) {
1159                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1160                             uint8_t byte = strtoul(hex, NULL, 16);
1161                             sl->q_buf[i] = byte;
1162                           }
1163                           stlink_write_mem8(sl, start, count);
1164                         }
1165                         reply = strdup("OK");
1166                         break;
1167                 }
1168
1169                 case 'Z': {
1170                         char *endptr;
1171                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1172                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1173
1174                         switch (packet[1]) {
1175                                 case '1':
1176                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1177                                         reply = strdup("E00");
1178                                 } else {
1179                                         reply = strdup("OK");
1180                                 }
1181                                 break;
1182
1183                                 case '2':   // insert write watchpoint
1184                                 case '3':   // insert read  watchpoint
1185                                 case '4':   // insert access watchpoint
1186                                 {
1187                                         enum watchfun wf;
1188                                         if(packet[1] == '2') {
1189                                                 wf = WATCHWRITE;
1190                                         } else if(packet[1] == '3') {
1191                                                 wf = WATCHREAD;
1192                                         } else {
1193                                                 wf = WATCHACCESS;
1194                                         }
1195
1196                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1197                         reply = strdup("E00");
1198                     } else {
1199                         reply = strdup("OK");
1200                         break;
1201                     }
1202                                 }
1203
1204                                 default:
1205                                 reply = strdup("");
1206                         }
1207                         break;
1208                 }
1209                 case 'z': {
1210                         char *endptr;
1211                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1212                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1213
1214                         switch (packet[1]) {
1215                                 case '1': // remove breakpoint
1216                                 update_code_breakpoint(sl, addr, 0);
1217                                 reply = strdup("OK");
1218                                 break;
1219
1220                                 case '2' : // remove write watchpoint
1221                                 case '3' : // remove read watchpoint
1222                                 case '4' : // remove access watchpoint
1223                                 if(delete_data_watchpoint(sl, addr) < 0) {
1224                                         reply = strdup("E00");
1225                                 } else {
1226                                         reply = strdup("OK");
1227                                         break;
1228                                 }
1229
1230                                 default:
1231                                 reply = strdup("");
1232                         }
1233                         break;
1234                 }
1235
1236                 case '!': {
1237                         /*
1238                          * Enter extended mode which allows restarting.
1239                          * We do support that always.
1240                          */
1241
1242                         /*
1243                          * Also, set to persistent mode
1244                          * to allow GDB disconnect.
1245                          */
1246                         st->persistent = 1;
1247
1248                         reply = strdup("OK");
1249
1250                         break;
1251                 }
1252
1253                 case 'R': {
1254                         /* Reset the core. */
1255
1256                         stlink_reset(sl);
1257                         init_code_breakpoints(sl);
1258                         init_data_watchpoints(sl);
1259
1260                         attached = 1;
1261
1262                         reply = strdup("OK");
1263
1264                         break;
1265                 }
1266
1267                 default:
1268                         reply = strdup("");
1269                 }
1270
1271                 if(reply) {
1272                         #if DEBUG
1273                         printf("send: %s\n", reply);
1274                         #endif
1275
1276                         int result = gdb_send_packet(client, reply);
1277                         if(result != 0) {
1278                                 fprintf(stderr, "cannot send: %d\n", result);
1279                                 free(reply);
1280                                 free(packet);
1281                                 return 1;
1282                         }
1283
1284                         free(reply);
1285                 }
1286
1287                 free(packet);
1288         }
1289
1290         return 0;
1291 }