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