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 <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #ifdef __MINGW32__
  16 #include "mingw.h"
  17 #else
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <signal.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 static const char hex[] = "0123456789abcdef";
  40
  41 static const char* current_memory_map = NULL;
  42
  43 /* Persistent mode flag.
  44  * In persistent mode, server starts listening again
  45  * on GDB disconnect. */
  46 int persistent = 0;
  47
  48 typedef struct _st_state_t {
  49     // things from command line, bleh
  50     int stlink_version;
  51     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  52     char devicename[100];
  53     int logging_level;
  54         int listen_port;
  55 } st_state_t;
  56
  57
  58 int serve(stlink_t *sl, int port);
  59 char* make_memory_map(stlink_t *sl);
  60
  61
  62 int parse_options(int argc, char** argv, st_state_t *st) {
  63     static struct option long_options[] = {
  64         {"help", no_argument, NULL, 'h'},
  65         {"verbose", optional_argument, NULL, 'v'},
  66         {"device", required_argument, NULL, 'd'},
  67         {"stlink_version", required_argument, NULL, 's'},
  68         {"stlinkv1", no_argument, NULL, '1'},
  69                 {"listen_port", required_argument, NULL, 'p'},
  70                 {"multi", optional_argument, NULL, 'm'},
  71         {0, 0, 0, 0},
  72     };
  73         const char * help_str = "%s - usage:\n\n"
  74         "  -h, --help\t\tPrint this help\n"
  75         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  76         "  -v, --verbose\tspecify generally verbose logging\n"
  77         "  -d <device>, --device=/dev/stlink2_1\n"
  78         "\t\t\tWhere is your stlink device connected?\n"
  79         "  -s X, --stlink_version=X\n"
  80         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  81         "  -1, --stlinkv1\tForce stlink version 1\n"
  82         "  -p 4242, --listen_port=1234\n"
  83         "\t\t\tSet the gdb server listen port. "
  84         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  85     "  -m, --multi\n"
  86     "\t\t\tSet gdb server to extended mode.\n"
  87     "\t\t\tst-util will continue listening for connections after disconnect.\n"
  88         ;
  89
  90
  91     int option_index = 0;
  92     int c;
  93     int q;
  94     while ((c = getopt_long(argc, argv, "hv::d:s:1p:m", long_options, &option_index)) != -1) {
  95         switch (c) {
  96         case 0:
  97             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  98             printf("option %s", long_options[option_index].name);
  99             if (optarg) {
 100                 printf(" with arg %s", optarg);
 101             }
 102             printf("\n");
 103             break;
 104         case 'h':
 105             printf(help_str, argv[0]);
 106             exit(EXIT_SUCCESS);
 107             break;
 108         case 'v':
 109             if (optarg) {
 110                 st->logging_level = atoi(optarg);
 111             } else {
 112                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 113             }
 114             break;
 115         case 'd':
 116             if (strlen(optarg) > sizeof (st->devicename)) {
 117                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 118             } else {
 119                 strcpy(st->devicename, optarg);
 120             }
 121             break;
 122                 case '1':
 123                         st->stlink_version = 1;
 124                         break;
 125                 case 's':
 126                         sscanf(optarg, "%i", &q);
 127                         if (q < 0 || q > 2) {
 128                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 129                                 exit(EXIT_FAILURE);
 130                         }
 131                         st->stlink_version = q;
 132                         break;
 133                 case 'p':
 134                         sscanf(optarg, "%i", &q);
 135                         if (q < 0) {
 136                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 137                                 exit(EXIT_FAILURE);
 138                         }
 139                         st->listen_port = q;
 140                         break;
 141                 case 'm':
 142                         persistent = 1;
 143                         break;
 144         }
 145     }
 146
 147     if (optind < argc) {
 148         printf("non-option ARGV-elements: ");
 149         while (optind < argc)
 150             printf("%s ", argv[optind++]);
 151         printf("\n");
 152     }
 153     return 0;
 154 }
 155
 156
 157 int main(int argc, char** argv) {
 158
 159         stlink_t *sl = NULL;
 160
 161         st_state_t state;
 162         memset(&state, 0, sizeof(state));
 163         // set defaults...
 164         state.stlink_version = 2;
 165         state.logging_level = DEFAULT_LOGGING_LEVEL;
 166         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 167         parse_options(argc, argv, &state);
 168         switch (state.stlink_version) {
 169         case 2:
 170                 sl = stlink_open_usb(state.logging_level);
 171                 if(sl == NULL) return 1;
 172                 break;
 173         case 1:
 174                 sl = stlink_v1_open(state.logging_level);
 175                 if(sl == NULL) return 1;
 176                 break;
 177     }
 178
 179         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 180
 181         sl->verbose=0;
 182
 183         current_memory_map = make_memory_map(sl);
 184
 185 #ifdef __MINGW32__
 186         WSADATA wsadata;
 187         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 188                 goto winsock_error;
 189         }
 190 #endif
 191
 192         do {
 193                 serve(sl, state.listen_port);
 194         } while (persistent);
 195
 196 #ifdef __MINGW32__
 197 winsock_error:
 198         WSACleanup();
 199 #endif
 200
 201         /* Switch back to mass storage mode before closing. */
 202         stlink_run(sl);
 203         stlink_exit_debug_mode(sl);
 204         stlink_close(sl);
 205
 206         return 0;
 207 }
 208
 209 static const char* const target_description_F4 =
 210     "<?xml version=\"1.0\"?>"
 211     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 212     "<target version=\"1.0\">"
 213     "   <architecture>arm</architecture>"
 214     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 215     "       <reg name=\"r0\" bitsize=\"32\"/>"
 216     "       <reg name=\"r1\" bitsize=\"32\"/>"
 217     "       <reg name=\"r2\" bitsize=\"32\"/>"
 218     "       <reg name=\"r3\" bitsize=\"32\"/>"
 219     "       <reg name=\"r4\" bitsize=\"32\"/>"
 220     "       <reg name=\"r5\" bitsize=\"32\"/>"
 221     "       <reg name=\"r6\" bitsize=\"32\"/>"
 222     "       <reg name=\"r7\" bitsize=\"32\"/>"
 223     "       <reg name=\"r8\" bitsize=\"32\"/>"
 224     "       <reg name=\"r9\" bitsize=\"32\"/>"
 225     "       <reg name=\"r10\" bitsize=\"32\"/>"
 226     "       <reg name=\"r11\" bitsize=\"32\"/>"
 227     "       <reg name=\"r12\" bitsize=\"32\"/>"
 228     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 229     "       <reg name=\"lr\" bitsize=\"32\"/>"
 230     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 231     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 232     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 233     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 234     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 235     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 236     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 237     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 238     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 239     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 240     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 241     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 242     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 243     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 244     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 245     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 246     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 247     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 248     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 249     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 250     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 251     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 252     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 253     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 254     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 255     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 256     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 257     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 258     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 259     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 260     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 261     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 262     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 263     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 264     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 271     "   </feature>"
 272     "</target>";
 273
 274 static const char* const memory_map_template_F4 =
 275   "<?xml version=\"1.0\"?>"
 276   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 277   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 278   "<memory-map>"
 279   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 280   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 281   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 282   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 283   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 284   "  </memory>"
 285   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 286   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 287   "  </memory>"
 288   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 289   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 290   "  </memory>"
 291   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 292   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 293   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 294   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 295   "</memory-map>";
 296
 297 static const char* const memory_map_template =
 298   "<?xml version=\"1.0\"?>"
 299   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 300   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 301   "<memory-map>"
 302   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 303   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 304   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 305   "    <property name=\"blocksize\">0x%zx</property>"
 306   "  </memory>"
 307   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 308   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 309   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 310   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 311   "</memory-map>";
 312
 313 char* make_memory_map(stlink_t *sl) {
 314         /* This will be freed in serve() */
 315         char* map = malloc(4096);
 316         map[0] = '\0';
 317
 318         if(sl->chip_id==STM32_CHIPID_F4) {
 319         strcpy(map, memory_map_template_F4);
 320     } else {
 321         snprintf(map, 4096, memory_map_template,
 322                         sl->flash_size,
 323                         sl->sram_size,
 324                         sl->flash_size, sl->flash_pgsz,
 325                         sl->sys_base, sl->sys_size);
 326     }
 327         return map;
 328 }
 329
 330
 331 /*
 332  * DWT_COMP0     0xE0001020
 333  * DWT_MASK0     0xE0001024
 334  * DWT_FUNCTION0 0xE0001028
 335  * DWT_COMP1     0xE0001030
 336  * DWT_MASK1     0xE0001034
 337  * DWT_FUNCTION1 0xE0001038
 338  * DWT_COMP2     0xE0001040
 339  * DWT_MASK2     0xE0001044
 340  * DWT_FUNCTION2 0xE0001048
 341  * DWT_COMP3     0xE0001050
 342  * DWT_MASK3     0xE0001054
 343  * DWT_FUNCTION3 0xE0001058
 344  */
 345
 346 #define DATA_WATCH_NUM 4
 347
 348 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 349
 350 struct code_hw_watchpoint {
 351         stm32_addr_t addr;
 352         uint8_t mask;
 353         enum watchfun fun;
 354 };
 355
 356 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 357
 358 static void init_data_watchpoints(stlink_t *sl) {
 359         #ifdef DEBUG
 360         printf("init watchpoints\n");
 361         #endif
 362
 363         // set trcena in debug command to turn on dwt unit
 364         stlink_write_debug32(sl, 0xE000EDFC,
 365                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 366
 367         // make sure all watchpoints are cleared
 368         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 369                 data_watches[i].fun = WATCHDISABLED;
 370                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 371         }
 372 }
 373
 374 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 375 {
 376         int i = 0;
 377         uint32_t mask;
 378
 379         // computer mask
 380         // find a free watchpoint
 381         // configure
 382
 383         mask = -1;
 384         i = len;
 385         while(i) {
 386                 i >>= 1;
 387                 mask++;
 388         }
 389
 390         if((mask != (uint32_t)-1) && (mask < 16)) {
 391                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 392                         // is this an empty slot ?
 393                         if(data_watches[i].fun == WATCHDISABLED) {
 394                                 #ifdef DEBUG
 395                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 396                                 #endif
 397
 398                                 data_watches[i].fun = wf;
 399                                 data_watches[i].addr = addr;
 400                                 data_watches[i].mask = mask;
 401
 402                                 // insert comparator address
 403                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 404
 405                                 // insert mask
 406                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 407
 408                                 // insert function
 409                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 410
 411                                 // just to make sure the matched bit is clear !
 412                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 413                                 return 0;
 414                         }
 415                 }
 416         }
 417
 418         #ifdef DEBUG
 419         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 420         #endif
 421         return -1;
 422 }
 423
 424 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 425 {
 426         int i;
 427
 428         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 429                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 430                         #ifdef DEBUG
 431                         printf("delete watchpoint %d addr %x\n", i, addr);
 432                         #endif
 433
 434                         data_watches[i].fun = WATCHDISABLED;
 435                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 436
 437                         return 0;
 438                 }
 439         }
 440
 441         #ifdef DEBUG
 442         printf("failure: delete watchpoint addr %x\n", addr);
 443         #endif
 444
 445         return -1;
 446 }
 447
 448 #define CODE_BREAK_NUM  6
 449 #define CODE_BREAK_LOW  0x01
 450 #define CODE_BREAK_HIGH 0x02
 451
 452 struct code_hw_breakpoint {
 453         stm32_addr_t addr;
 454         int          type;
 455 };
 456
 457 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 458
 459 static void init_code_breakpoints(stlink_t *sl) {
 460         memset(sl->q_buf, 0, 4);
 461         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 462         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 463         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 464
 465         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 466                 code_breaks[i].type = 0;
 467                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 468         }
 469 }
 470
 471 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 472         stm32_addr_t fpb_addr = addr & ~0x3;
 473         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 474
 475         if(addr & 1) {
 476                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 477                 return -1;
 478         }
 479
 480         int id = -1;
 481         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 482                 if(fpb_addr == code_breaks[i].addr ||
 483                         (set && code_breaks[i].type == 0)) {
 484                         id = i;
 485                         break;
 486                 }
 487         }
 488
 489         if(id == -1) {
 490                 if(set) return -1; // Free slot not found
 491                 else    return 0;  // Breakpoint is already removed
 492         }
 493
 494         struct code_hw_breakpoint* brk = &code_breaks[id];
 495
 496         brk->addr = fpb_addr;
 497
 498         if(set) brk->type |= type;
 499         else    brk->type &= ~type;
 500
 501         if(brk->type == 0) {
 502                 #ifdef DEBUG
 503                 printf("clearing hw break %d\n", id);
 504                 #endif
 505
 506                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 507         } else {
 508                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 509
 510                 #ifdef DEBUG
 511                 printf("setting hw break %d at %08x (%d)\n",
 512                         id, brk->addr, brk->type);
 513                 printf("reg %08x \n",
 514                         mask);
 515                 #endif
 516
 517                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 518         }
 519
 520         return 0;
 521 }
 522
 523
 524 struct flash_block {
 525         stm32_addr_t addr;
 526         unsigned     length;
 527         uint8_t*     data;
 528
 529         struct flash_block* next;
 530 };
 531
 532 static struct flash_block* flash_root;
 533
 534 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 535
 536         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 537                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 538                 return -1;
 539         }
 540
 541         stlink_calculate_pagesize(sl, addr);
 542         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 543                 fprintf(stderr, "flash_add_block: unaligned block\n");
 544                 return -1;
 545         }
 546
 547         struct flash_block* new = malloc(sizeof(struct flash_block));
 548         new->next = flash_root;
 549
 550         new->addr   = addr;
 551         new->length = length;
 552         new->data   = calloc(length, 1);
 553
 554         flash_root = new;
 555
 556         return 0;
 557 }
 558
 559 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 560         unsigned int fit_blocks = 0, fit_length = 0;
 561
 562         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 563                 /* Block: ------X------Y--------
 564                  * Data:            a-----b
 565                  *                a--b
 566                  *            a-----------b
 567                  * Block intersects with data, if:
 568                  *  a < Y && b > x
 569                  */
 570
 571                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 572                 unsigned a = addr, b = addr + length;
 573                 if(a < Y && b > X) {
 574                         // from start of the block
 575                         unsigned start = (a > X ? a : X) - X;
 576                         unsigned end   = (b > Y ? Y : b) - X;
 577
 578                         memcpy(fb->data + start, data, end - start);
 579
 580                         fit_blocks++;
 581                         fit_length += end - start;
 582                 }
 583         }
 584
 585         if(fit_blocks == 0) {
 586                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 587                 return -1;
 588         }
 589
 590         if(fit_length != length) {
 591                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 592                         addr, length, fit_length);
 593                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 594         }
 595
 596         return 0;
 597 }
 598
 599 static int flash_go(stlink_t *sl) {
 600         int error = -1;
 601
 602         // Some kinds of clock settings do not allow writing to flash.
 603         stlink_reset(sl);
 604
 605         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 606                 #ifdef DEBUG
 607                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 608                 #endif
 609
 610                 unsigned length = fb->length;
 611                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 612
 613                         //Update FLASH_PAGE
 614                         stlink_calculate_pagesize(sl, page);
 615
 616                         #ifdef DEBUG
 617                         printf("flash_do: page %08x\n", page);
 618                         #endif
 619
 620                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 621                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 622                                 goto error;
 623                         }
 624         }
 625
 626         stlink_reset(sl);
 627
 628         error = 0;
 629
 630 error:
 631         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 632                 next = fb->next;
 633                 free(fb->data);
 634                 free(fb);
 635         }
 636
 637         flash_root = NULL;
 638
 639         return error;
 640 }
 641
 642 int serve(stlink_t *sl, int port) {
 643         int sock = socket(AF_INET, SOCK_STREAM, 0);
 644         if(sock < 0) {
 645                 perror("socket");
 646                 return 1;
 647         }
 648
 649         unsigned int val = 1;
 650         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 651
 652         struct sockaddr_in serv_addr;
 653         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 654         serv_addr.sin_family = AF_INET;
 655         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 656         serv_addr.sin_port = htons(port);
 657
 658         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 659                 perror("bind");
 660                 return 1;
 661         }
 662
 663         if(listen(sock, 5) < 0) {
 664                 perror("listen");
 665                 return 1;
 666         }
 667
 668         stlink_force_debug(sl);
 669         stlink_reset(sl);
 670         init_code_breakpoints(sl);
 671         init_data_watchpoints(sl);
 672
 673         printf("Listening at *:%d...\n", port);
 674
 675         int client = accept(sock, NULL, NULL);
 676         //signal (SIGINT, SIG_DFL);
 677         if(client < 0) {
 678                 perror("accept");
 679                 return 1;
 680         }
 681
 682         close(sock);
 683
 684         printf("GDB connected.\n");
 685
 686         /*
 687          * To allow resetting the chip from GDB it is required to
 688          * emulate attaching and detaching to target.
 689          */
 690         unsigned int attached = 1;
 691
 692         while(1) {
 693                 char* packet;
 694
 695                 int status = gdb_recv_packet(client, &packet);
 696                 if(status < 0) {
 697                         fprintf(stderr, "cannot recv: %d\n", status);
 698                         return 1;
 699                 }
 700
 701                 #ifdef DEBUG
 702                 printf("recv: %s\n", packet);
 703                 #endif
 704
 705                 char* reply = NULL;
 706                 reg regp;
 707
 708                 switch(packet[0]) {
 709                 case 'q': {
 710                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 711                                 reply = strdup("");
 712                                 break;
 713                         }
 714
 715                         char *separator = strstr(packet, ":"), *params = "";
 716                         if(separator == NULL) {
 717                                 separator = packet + strlen(packet);
 718                         } else {
 719                                 params = separator + 1;
 720                         }
 721
 722                         unsigned queryNameLength = (separator - &packet[1]);
 723                         char* queryName = calloc(queryNameLength + 1, 1);
 724                         strncpy(queryName, &packet[1], queryNameLength);
 725
 726                         #ifdef DEBUG
 727                         printf("query: %s;%s\n", queryName, params);
 728                         #endif
 729
 730                         if(!strcmp(queryName, "Supported")) {
 731                 if(sl->chip_id==STM32_CHIPID_F4) {
 732                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 733                 }
 734                 else {
 735                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 736                 }
 737                         } else if(!strcmp(queryName, "Xfer")) {
 738                                 char *type, *op, *__s_addr, *s_length;
 739                                 char *tok = params;
 740                                 char *annex __attribute__((unused));
 741
 742                                 type     = strsep(&tok, ":");
 743                                 op       = strsep(&tok, ":");
 744                                 annex    = strsep(&tok, ":");
 745                                 __s_addr   = strsep(&tok, ",");
 746                                 s_length = tok;
 747
 748                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 749                                        length = strtoul(s_length, NULL, 16);
 750
 751                                 #ifdef DEBUG
 752                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 753                                         type, op, annex, addr, length);
 754                                 #endif
 755
 756                                 const char* data = NULL;
 757
 758                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 759                                         data = current_memory_map;
 760
 761                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 762                                         data = target_description_F4;
 763
 764                                 if(data) {
 765                                         unsigned data_length = strlen(data);
 766                                         if(addr + length > data_length)
 767                                                 length = data_length - addr;
 768
 769                                         if(length == 0) {
 770                                                 reply = strdup("l");
 771                                         } else {
 772                                                 reply = calloc(length + 2, 1);
 773                                                 reply[0] = 'm';
 774                                                 strncpy(&reply[1], data, length);
 775                                         }
 776                                 }
 777                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 778                                 // Rcmd uses the wrong separator
 779                                 char *separator = strstr(packet, ","), *params = "";
 780                                 if(separator == NULL) {
 781                                         separator = packet + strlen(packet);
 782                                 } else {
 783                                         params = separator + 1;
 784                                 }
 785
 786
 787                                 if (!strncmp(params,"726573756d65",12)) {// resume
 788 #ifdef DEBUG
 789                                         printf("Rcmd: resume\n");
 790 #endif
 791                                         stlink_run(sl);
 792
 793                                         reply = strdup("OK");
 794                 } else if (!strncmp(params,"68616c74",8)) { //halt
 795                                         reply = strdup("OK");
 796
 797                                         stlink_force_debug(sl);
 798
 799 #ifdef DEBUG
 800                                         printf("Rcmd: halt\n");
 801 #endif
 802                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 803                                         reply = strdup("OK");
 804
 805                                         stlink_jtag_reset(sl, 1);
 806                                         stlink_jtag_reset(sl, 0);
 807                                         stlink_force_debug(sl);
 808
 809 #ifdef DEBUG
 810                                         printf("Rcmd: jtag_reset\n");
 811 #endif
 812                 } else if (!strncmp(params,"7265736574",10)) { //reset
 813                                         reply = strdup("OK");
 814
 815                                         stlink_force_debug(sl);
 816                                         stlink_reset(sl);
 817                                         init_code_breakpoints(sl);
 818                                         init_data_watchpoints(sl);
 819
 820 #ifdef DEBUG
 821                                         printf("Rcmd: reset\n");
 822 #endif
 823                                 } else {
 824 #ifdef DEBUG
 825                                         printf("Rcmd: %s\n", params);
 826 #endif
 827
 828                                 }
 829
 830                         }
 831
 832                         if(reply == NULL)
 833                                 reply = strdup("");
 834
 835                         free(queryName);
 836
 837                         break;
 838                 }
 839
 840                 case 'v': {
 841                         char *params = NULL;
 842                         char *cmdName = strtok_r(packet, ":;", &params);
 843
 844                         cmdName++; // vCommand -> Command
 845
 846                         if(!strcmp(cmdName, "FlashErase")) {
 847                                 char *__s_addr, *s_length;
 848                                 char *tok = params;
 849
 850                                 __s_addr   = strsep(&tok, ",");
 851                                 s_length = tok;
 852
 853                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 854                                        length = strtoul(s_length, NULL, 16);
 855
 856                                 #ifdef DEBUG
 857                                 printf("FlashErase: addr:%08x,len:%04x\n",
 858                                         addr, length);
 859                                 #endif
 860
 861                                 if(flash_add_block(addr, length, sl) < 0) {
 862                                         reply = strdup("E00");
 863                                 } else {
 864                                         reply = strdup("OK");
 865                                 }
 866                         } else if(!strcmp(cmdName, "FlashWrite")) {
 867                                 char *__s_addr, *data;
 868                                 char *tok = params;
 869
 870                                 __s_addr = strsep(&tok, ":");
 871                                 data   = tok;
 872
 873                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 874                                 unsigned data_length = status - (data - packet);
 875
 876                                 // Length of decoded data cannot be more than
 877                                 // encoded, as escapes are removed.
 878                                 // Additional byte is reserved for alignment fix.
 879                                 uint8_t *decoded = calloc(data_length + 1, 1);
 880                                 unsigned dec_index = 0;
 881                                 for(unsigned int i = 0; i < data_length; i++) {
 882                                         if(data[i] == 0x7d) {
 883                                                 i++;
 884                                                 decoded[dec_index++] = data[i] ^ 0x20;
 885                                         } else {
 886                                                 decoded[dec_index++] = data[i];
 887                                         }
 888                                 }
 889
 890                                 // Fix alignment
 891                                 if(dec_index % 2 != 0)
 892                                         dec_index++;
 893
 894                                 #ifdef DEBUG
 895                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 896                                 #endif
 897
 898                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 899                                         reply = strdup("E00");
 900                                 } else {
 901                                         reply = strdup("OK");
 902                                 }
 903                         } else if(!strcmp(cmdName, "FlashDone")) {
 904                                 if(flash_go(sl) < 0) {
 905                                         reply = strdup("E00");
 906                                 } else {
 907                                         reply = strdup("OK");
 908                                 }
 909                         } else if(!strcmp(cmdName, "Kill")) {
 910                                 attached = 0;
 911
 912                                 reply = strdup("OK");
 913                         }
 914
 915                         if(reply == NULL)
 916                                 reply = strdup("");
 917
 918                         break;
 919                 }
 920
 921                 case 'c':
 922                         stlink_run(sl);
 923
 924                         while(1) {
 925                                 int status = gdb_check_for_interrupt(client);
 926                                 if(status < 0) {
 927                                         fprintf(stderr, "cannot check for int: %d\n", status);
 928                                         return 1;
 929                                 }
 930
 931                                 if(status == 1) {
 932                                         stlink_force_debug(sl);
 933                                         break;
 934                                 }
 935
 936                                 stlink_status(sl);
 937                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 938                                         break;
 939                                 }
 940
 941                                 usleep(100000);
 942                         }
 943
 944                         reply = strdup("S05"); // TRAP
 945                         break;
 946
 947                 case 's':
 948                         stlink_step(sl);
 949
 950                         reply = strdup("S05"); // TRAP
 951                         break;
 952
 953                 case '?':
 954                         if(attached) {
 955                                 reply = strdup("S05"); // TRAP
 956                         } else {
 957                                 /* Stub shall reply OK if not attached. */
 958                                 reply = strdup("OK");
 959                         }
 960                         break;
 961
 962                 case 'g':
 963                         stlink_read_all_regs(sl, &regp);
 964
 965                         reply = calloc(8 * 16 + 1, 1);
 966                         for(int i = 0; i < 16; i++)
 967                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 968
 969                         break;
 970
 971                 case 'p': {
 972                         unsigned id = strtoul(&packet[1], NULL, 16);
 973                         unsigned myreg = 0xDEADDEAD;
 974
 975                         if(id < 16) {
 976                                 stlink_read_reg(sl, id, &regp);
 977                                 myreg = htonl(regp.r[id]);
 978                         } else if(id == 0x19) {
 979                                 stlink_read_reg(sl, 16, &regp);
 980                                 myreg = htonl(regp.xpsr);
 981                         } else if(id == 0x1A) {
 982                                 stlink_read_reg(sl, 17, &regp);
 983                                 myreg = htonl(regp.main_sp);
 984                         } else if(id == 0x1B) {
 985                                 stlink_read_reg(sl, 18, &regp);
 986                                 myreg = htonl(regp.process_sp);
 987                         } else if(id == 0x1C) {
 988                                 stlink_read_unsupported_reg(sl, id, &regp);
 989                                 myreg = htonl(regp.control);
 990                         } else if(id == 0x1D) {
 991                                 stlink_read_unsupported_reg(sl, id, &regp);
 992                                 myreg = htonl(regp.faultmask);
 993                         } else if(id == 0x1E) {
 994                                 stlink_read_unsupported_reg(sl, id, &regp);
 995                                 myreg = htonl(regp.basepri);
 996                         } else if(id == 0x1F) {
 997                                 stlink_read_unsupported_reg(sl, id, &regp);
 998                                 myreg = htonl(regp.primask);
 999             } else if(id >= 0x20 && id < 0x40) {
1000                 stlink_read_unsupported_reg(sl, id, &regp);
1001                 myreg = htonl(regp.s[id-0x20]);
1002                         } else if(id == 0x40) {
1003                 stlink_read_unsupported_reg(sl, id, &regp);
1004                 myreg = htonl(regp.fpscr);
1005                         } else {
1006                                 reply = strdup("E00");
1007                         }
1008
1009                         reply = calloc(8 + 1, 1);
1010                         sprintf(reply, "%08x", myreg);
1011
1012                         break;
1013                 }
1014
1015                 case 'P': {
1016                         char* s_reg = &packet[1];
1017                         char* s_value = strstr(&packet[1], "=") + 1;
1018
1019                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1020                         unsigned value = strtoul(s_value, NULL, 16);
1021
1022                         if(reg < 16) {
1023                                 stlink_write_reg(sl, ntohl(value), reg);
1024                         } else if(reg == 0x19) {
1025                                 stlink_write_reg(sl, ntohl(value), 16);
1026                         } else if(reg == 0x1A) {
1027                                 stlink_write_reg(sl, ntohl(value), 17);
1028                         } else if(reg == 0x1B) {
1029                                 stlink_write_reg(sl, ntohl(value), 18);
1030                         } else if(reg == 0x1C) {
1031                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1032                         } else if(reg == 0x1D) {
1033                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1034                         } else if(reg == 0x1E) {
1035                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1036                         } else if(reg == 0x1F) {
1037                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1038             } else if(reg >= 0x20 && reg < 0x40) {
1039                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1040                         } else if(reg == 0x40) {
1041                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1042                         } else {
1043                                 reply = strdup("E00");
1044                         }
1045
1046                         if(!reply) {
1047                                 reply = strdup("OK");
1048                         }
1049
1050                         break;
1051                 }
1052
1053                 case 'G':
1054                         for(int i = 0; i < 16; i++) {
1055                                 char str[9] = {0};
1056                                 strncpy(str, &packet[1 + i * 8], 8);
1057                                 uint32_t reg = strtoul(str, NULL, 16);
1058                                 stlink_write_reg(sl, ntohl(reg), i);
1059                         }
1060
1061                         reply = strdup("OK");
1062                         break;
1063
1064                 case 'm': {
1065                         char* s_start = &packet[1];
1066                         char* s_count = strstr(&packet[1], ",") + 1;
1067
1068                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1069                         unsigned     count = strtoul(s_count, NULL, 16);
1070
1071                         unsigned adj_start = start % 4;
1072                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1073
1074                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1075
1076                         reply = calloc(count * 2 + 1, 1);
1077                         for(unsigned int i = 0; i < count; i++) {
1078                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1079                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1080                         }
1081
1082                         break;
1083                 }
1084
1085                 case 'M': {
1086                         char* s_start = &packet[1];
1087                         char* s_count = strstr(&packet[1], ",") + 1;
1088                         char* hexdata = strstr(packet, ":") + 1;
1089
1090                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1091                         unsigned     count = strtoul(s_count, NULL, 16);
1092
1093                         if(start % 4) {
1094                           unsigned align_count = 4 - start % 4;
1095                           if (align_count > count) align_count = count;
1096                           for(unsigned int i = 0; i < align_count; i ++) {
1097                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1098                                 uint8_t byte = strtoul(hex, NULL, 16);
1099                                 sl->q_buf[i] = byte;
1100                           }
1101                           stlink_write_mem8(sl, start, align_count);
1102                           start += align_count;
1103                           count -= align_count;
1104                           hexdata += 2*align_count;
1105                         }
1106
1107                         if(count - count % 4) {
1108                           unsigned aligned_count = count - count % 4;
1109
1110                           for(unsigned int i = 0; i < aligned_count; i ++) {
1111                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1112                             uint8_t byte = strtoul(hex, NULL, 16);
1113                             sl->q_buf[i] = byte;
1114                           }
1115                           stlink_write_mem32(sl, start, aligned_count);
1116                           count -= aligned_count;
1117                           start += aligned_count;
1118                           hexdata += 2*aligned_count;
1119                         }
1120
1121                         if(count) {
1122                           for(unsigned int i = 0; i < count; i ++) {
1123                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1124                             uint8_t byte = strtoul(hex, NULL, 16);
1125                             sl->q_buf[i] = byte;
1126                           }
1127                           stlink_write_mem8(sl, start, count);
1128                         }
1129                         reply = strdup("OK");
1130                         break;
1131                 }
1132
1133                 case 'Z': {
1134                         char *endptr;
1135                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1136                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1137
1138                         switch (packet[1]) {
1139                                 case '1':
1140                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1141                                         reply = strdup("E00");
1142                                 } else {
1143                                         reply = strdup("OK");
1144                                 }
1145                                 break;
1146
1147                                 case '2':   // insert write watchpoint
1148                                 case '3':   // insert read  watchpoint
1149                                 case '4':   // insert access watchpoint
1150                                 {
1151                                         enum watchfun wf;
1152                                         if(packet[1] == '2') {
1153                                                 wf = WATCHWRITE;
1154                                         } else if(packet[1] == '3') {
1155                                                 wf = WATCHREAD;
1156                                         } else {
1157                                                 wf = WATCHACCESS;
1158                                         }
1159
1160                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1161                         reply = strdup("E00");
1162                     } else {
1163                         reply = strdup("OK");
1164                         break;
1165                     }
1166                                 }
1167
1168                                 default:
1169                                 reply = strdup("");
1170                         }
1171                         break;
1172                 }
1173                 case 'z': {
1174                         char *endptr;
1175                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1176                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1177
1178                         switch (packet[1]) {
1179                                 case '1': // remove breakpoint
1180                                 update_code_breakpoint(sl, addr, 0);
1181                                 reply = strdup("OK");
1182                                 break;
1183
1184                                 case '2' : // remove write watchpoint
1185                                 case '3' : // remove read watchpoint
1186                                 case '4' : // remove access watchpoint
1187                                 if(delete_data_watchpoint(sl, addr) < 0) {
1188                                         reply = strdup("E00");
1189                                 } else {
1190                                         reply = strdup("OK");
1191                                         break;
1192                                 }
1193
1194                                 default:
1195                                 reply = strdup("");
1196                         }
1197                         break;
1198                 }
1199
1200                 case '!': {
1201                         /*
1202                          * Enter extended mode which allows restarting.
1203                          * We do support that always.
1204                          */
1205
1206                         /*
1207                          * Also, set to persistent mode
1208                          * to allow GDB disconnect.
1209                          */
1210                         persistent = 1;
1211
1212                         reply = strdup("OK");
1213
1214                         break;
1215                 }
1216
1217                 case 'R': {
1218                         /* Reset the core. */
1219
1220                         stlink_reset(sl);
1221                         init_code_breakpoints(sl);
1222                         init_data_watchpoints(sl);
1223
1224                         attached = 1;
1225
1226                         reply = strdup("OK");
1227
1228                         break;
1229                 }
1230
1231                 default:
1232                         reply = strdup("");
1233                 }
1234
1235                 if(reply) {
1236                         #ifdef DEBUG
1237                         printf("send: %s\n", reply);
1238                         #endif
1239
1240                         int result = gdb_send_packet(client, reply);
1241                         if(result != 0) {
1242                                 fprintf(stderr, "cannot send: %d\n", result);
1243                                 free(reply);
1244                                 free(packet);
1245                                 return 1;
1246                         }
1247
1248                         free(reply);
1249                 }
1250
1251                 free(packet);
1252         }
1253
1254         return 0;
1255 }