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 stlink_t *connected_stlink = NULL;
  40
  41 static const char hex[] = "0123456789abcdef";
  42
  43 static const char* current_memory_map = NULL;
  44
  45 typedef struct _st_state_t {
  46     // things from command line, bleh
  47     int stlink_version;
  48     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  49     char devicename[100];
  50     int logging_level;
  51         int listen_port;
  52     int persistent;
  53 } st_state_t;
  54
  55
  56 int serve(stlink_t *sl, st_state_t *st);
  57 char* make_memory_map(stlink_t *sl);
  58
  59 static void cleanup(int signal __attribute__((unused))) {
  60     if (connected_stlink) {
  61         /* Switch back to mass storage mode before closing. */
  62         stlink_run(connected_stlink);
  63         stlink_exit_debug_mode(connected_stlink);
  64         stlink_close(connected_stlink);
  65     }
  66
  67     exit(1);
  68 }
  69
  70
  71
  72 int parse_options(int argc, char** argv, st_state_t *st) {
  73     static struct option long_options[] = {
  74         {"help", no_argument, NULL, 'h'},
  75         {"verbose", optional_argument, NULL, 'v'},
  76         {"device", required_argument, NULL, 'd'},
  77         {"stlink_version", required_argument, NULL, 's'},
  78         {"stlinkv1", no_argument, NULL, '1'},
  79                 {"listen_port", required_argument, NULL, 'p'},
  80                 {"multi", optional_argument, NULL, 'm'},
  81         {0, 0, 0, 0},
  82     };
  83         const char * help_str = "%s - usage:\n\n"
  84         "  -h, --help\t\tPrint this help\n"
  85         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  86         "  -v, --verbose\tspecify generally verbose logging\n"
  87         "  -d <device>, --device=/dev/stlink2_1\n"
  88         "\t\t\tWhere is your stlink device connected?\n"
  89         "  -s X, --stlink_version=X\n"
  90         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  91         "  -1, --stlinkv1\tForce stlink version 1\n"
  92         "  -p 4242, --listen_port=1234\n"
  93         "\t\t\tSet the gdb server listen port. "
  94         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  95     "  -m, --multi\n"
  96     "\t\t\tSet gdb server to extended mode.\n"
  97     "\t\t\tst-util will continue listening for connections after disconnect.\n"
  98         ;
  99
 100
 101     int option_index = 0;
 102     int c;
 103     int q;
 104     while ((c = getopt_long(argc, argv, "hv::d:s:1p:m", long_options, &option_index)) != -1) {
 105         switch (c) {
 106         case 0:
 107             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 108             printf("option %s", long_options[option_index].name);
 109             if (optarg) {
 110                 printf(" with arg %s", optarg);
 111             }
 112             printf("\n");
 113             break;
 114         case 'h':
 115             printf(help_str, argv[0]);
 116             exit(EXIT_SUCCESS);
 117             break;
 118         case 'v':
 119             if (optarg) {
 120                 st->logging_level = atoi(optarg);
 121             } else {
 122                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 123             }
 124             break;
 125         case 'd':
 126             if (strlen(optarg) > sizeof (st->devicename)) {
 127                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 128             } else {
 129                 strcpy(st->devicename, optarg);
 130             }
 131             break;
 132                 case '1':
 133                         st->stlink_version = 1;
 134                         break;
 135                 case 's':
 136                         sscanf(optarg, "%i", &q);
 137                         if (q < 0 || q > 2) {
 138                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 139                                 exit(EXIT_FAILURE);
 140                         }
 141                         st->stlink_version = q;
 142                         break;
 143                 case 'p':
 144                         sscanf(optarg, "%i", &q);
 145                         if (q < 0) {
 146                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 147                                 exit(EXIT_FAILURE);
 148                         }
 149                         st->listen_port = q;
 150                         break;
 151                 case 'm':
 152                         st->persistent = 1;
 153                         break;
 154         }
 155     }
 156
 157     if (optind < argc) {
 158         printf("non-option ARGV-elements: ");
 159         while (optind < argc)
 160             printf("%s ", argv[optind++]);
 161         printf("\n");
 162     }
 163     return 0;
 164 }
 165
 166
 167 int main(int argc, char** argv) {
 168
 169         stlink_t *sl = NULL;
 170
 171         st_state_t state;
 172         memset(&state, 0, sizeof(state));
 173         // set defaults...
 174         state.stlink_version = 2;
 175         state.logging_level = DEFAULT_LOGGING_LEVEL;
 176         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 177         parse_options(argc, argv, &state);
 178         switch (state.stlink_version) {
 179         case 2:
 180                 sl = stlink_open_usb(state.logging_level);
 181                 if(sl == NULL) return 1;
 182                 break;
 183         case 1:
 184                 sl = stlink_v1_open(state.logging_level);
 185                 if(sl == NULL) return 1;
 186                 break;
 187     }
 188
 189     connected_stlink = sl;
 190     signal(SIGINT, &cleanup);
 191     signal(SIGTERM, &cleanup);
 192
 193         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 194
 195         sl->verbose=0;
 196
 197         current_memory_map = make_memory_map(sl);
 198
 199 #ifdef __MINGW32__
 200         WSADATA wsadata;
 201         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 202                 goto winsock_error;
 203         }
 204 #endif
 205
 206         do {
 207                 serve(sl, &state);
 208         } while (state.persistent);
 209
 210 #ifdef __MINGW32__
 211 winsock_error:
 212         WSACleanup();
 213 #endif
 214
 215         /* Switch back to mass storage mode before closing. */
 216         stlink_run(sl);
 217         stlink_exit_debug_mode(sl);
 218         stlink_close(sl);
 219
 220         return 0;
 221 }
 222
 223 static const char* const target_description_F4 =
 224     "<?xml version=\"1.0\"?>"
 225     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 226     "<target version=\"1.0\">"
 227     "   <architecture>arm</architecture>"
 228     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 229     "       <reg name=\"r0\" bitsize=\"32\"/>"
 230     "       <reg name=\"r1\" bitsize=\"32\"/>"
 231     "       <reg name=\"r2\" bitsize=\"32\"/>"
 232     "       <reg name=\"r3\" bitsize=\"32\"/>"
 233     "       <reg name=\"r4\" bitsize=\"32\"/>"
 234     "       <reg name=\"r5\" bitsize=\"32\"/>"
 235     "       <reg name=\"r6\" bitsize=\"32\"/>"
 236     "       <reg name=\"r7\" bitsize=\"32\"/>"
 237     "       <reg name=\"r8\" bitsize=\"32\"/>"
 238     "       <reg name=\"r9\" bitsize=\"32\"/>"
 239     "       <reg name=\"r10\" bitsize=\"32\"/>"
 240     "       <reg name=\"r11\" bitsize=\"32\"/>"
 241     "       <reg name=\"r12\" bitsize=\"32\"/>"
 242     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 243     "       <reg name=\"lr\" bitsize=\"32\"/>"
 244     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 245     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 246     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 247     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 248     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 249     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 250     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 251     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 252     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 253     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 254     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 255     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 256     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 257     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 258     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 259     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 260     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 261     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 262     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 263     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 264     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 271     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 272     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 285     "   </feature>"
 286     "</target>";
 287
 288 static const char* const memory_map_template_F4 =
 289   "<?xml version=\"1.0\"?>"
 290   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 291   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 292   "<memory-map>"
 293   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 294   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 295   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 296   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 297   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 298   "  </memory>"
 299   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 300   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 301   "  </memory>"
 302   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 303   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 304   "  </memory>"
 305   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 306   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 307   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 308   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 309   "</memory-map>";
 310
 311 static const char* const memory_map_template =
 312   "<?xml version=\"1.0\"?>"
 313   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 314   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 315   "<memory-map>"
 316   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 317   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 318   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 319   "    <property name=\"blocksize\">0x%zx</property>"
 320   "  </memory>"
 321   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 322   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 323   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 324   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 325   "</memory-map>";
 326
 327 char* make_memory_map(stlink_t *sl) {
 328         /* This will be freed in serve() */
 329         char* map = malloc(4096);
 330         map[0] = '\0';
 331
 332         if(sl->chip_id==STM32_CHIPID_F4) {
 333         strcpy(map, memory_map_template_F4);
 334     } else {
 335         snprintf(map, 4096, memory_map_template,
 336                         sl->flash_size,
 337                         sl->sram_size,
 338                         sl->flash_size, sl->flash_pgsz,
 339                         sl->sys_base, sl->sys_size);
 340     }
 341         return map;
 342 }
 343
 344
 345 /*
 346  * DWT_COMP0     0xE0001020
 347  * DWT_MASK0     0xE0001024
 348  * DWT_FUNCTION0 0xE0001028
 349  * DWT_COMP1     0xE0001030
 350  * DWT_MASK1     0xE0001034
 351  * DWT_FUNCTION1 0xE0001038
 352  * DWT_COMP2     0xE0001040
 353  * DWT_MASK2     0xE0001044
 354  * DWT_FUNCTION2 0xE0001048
 355  * DWT_COMP3     0xE0001050
 356  * DWT_MASK3     0xE0001054
 357  * DWT_FUNCTION3 0xE0001058
 358  */
 359
 360 #define DATA_WATCH_NUM 4
 361
 362 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 363
 364 struct code_hw_watchpoint {
 365         stm32_addr_t addr;
 366         uint8_t mask;
 367         enum watchfun fun;
 368 };
 369
 370 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 371
 372 static void init_data_watchpoints(stlink_t *sl) {
 373         #ifdef DEBUG
 374         printf("init watchpoints\n");
 375         #endif
 376
 377         // set trcena in debug command to turn on dwt unit
 378         stlink_write_debug32(sl, 0xE000EDFC,
 379                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 380
 381         // make sure all watchpoints are cleared
 382         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 383                 data_watches[i].fun = WATCHDISABLED;
 384                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 385         }
 386 }
 387
 388 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 389 {
 390         int i = 0;
 391         uint32_t mask;
 392
 393         // computer mask
 394         // find a free watchpoint
 395         // configure
 396
 397         mask = -1;
 398         i = len;
 399         while(i) {
 400                 i >>= 1;
 401                 mask++;
 402         }
 403
 404         if((mask != (uint32_t)-1) && (mask < 16)) {
 405                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 406                         // is this an empty slot ?
 407                         if(data_watches[i].fun == WATCHDISABLED) {
 408                                 #ifdef DEBUG
 409                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 410                                 #endif
 411
 412                                 data_watches[i].fun = wf;
 413                                 data_watches[i].addr = addr;
 414                                 data_watches[i].mask = mask;
 415
 416                                 // insert comparator address
 417                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 418
 419                                 // insert mask
 420                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 421
 422                                 // insert function
 423                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 424
 425                                 // just to make sure the matched bit is clear !
 426                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 427                                 return 0;
 428                         }
 429                 }
 430         }
 431
 432         #ifdef DEBUG
 433         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 434         #endif
 435         return -1;
 436 }
 437
 438 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 439 {
 440         int i;
 441
 442         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 443                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 444                         #ifdef DEBUG
 445                         printf("delete watchpoint %d addr %x\n", i, addr);
 446                         #endif
 447
 448                         data_watches[i].fun = WATCHDISABLED;
 449                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 450
 451                         return 0;
 452                 }
 453         }
 454
 455         #ifdef DEBUG
 456         printf("failure: delete watchpoint addr %x\n", addr);
 457         #endif
 458
 459         return -1;
 460 }
 461
 462 #define CODE_BREAK_NUM  6
 463 #define CODE_BREAK_LOW  0x01
 464 #define CODE_BREAK_HIGH 0x02
 465
 466 struct code_hw_breakpoint {
 467         stm32_addr_t addr;
 468         int          type;
 469 };
 470
 471 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 472
 473 static void init_code_breakpoints(stlink_t *sl) {
 474         memset(sl->q_buf, 0, 4);
 475         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 476         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 477         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 478
 479         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 480                 code_breaks[i].type = 0;
 481                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 482         }
 483 }
 484
 485 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 486         stm32_addr_t fpb_addr = addr & ~0x3;
 487         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 488
 489         if(addr & 1) {
 490                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 491                 return -1;
 492         }
 493
 494         int id = -1;
 495         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 496                 if(fpb_addr == code_breaks[i].addr ||
 497                         (set && code_breaks[i].type == 0)) {
 498                         id = i;
 499                         break;
 500                 }
 501         }
 502
 503         if(id == -1) {
 504                 if(set) return -1; // Free slot not found
 505                 else    return 0;  // Breakpoint is already removed
 506         }
 507
 508         struct code_hw_breakpoint* brk = &code_breaks[id];
 509
 510         brk->addr = fpb_addr;
 511
 512         if(set) brk->type |= type;
 513         else    brk->type &= ~type;
 514
 515         if(brk->type == 0) {
 516                 #ifdef DEBUG
 517                 printf("clearing hw break %d\n", id);
 518                 #endif
 519
 520                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 521         } else {
 522                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 523
 524                 #ifdef DEBUG
 525                 printf("setting hw break %d at %08x (%d)\n",
 526                         id, brk->addr, brk->type);
 527                 printf("reg %08x \n",
 528                         mask);
 529                 #endif
 530
 531                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 532         }
 533
 534         return 0;
 535 }
 536
 537
 538 struct flash_block {
 539         stm32_addr_t addr;
 540         unsigned     length;
 541         uint8_t*     data;
 542
 543         struct flash_block* next;
 544 };
 545
 546 static struct flash_block* flash_root;
 547
 548 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 549
 550         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 551                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 552                 return -1;
 553         }
 554
 555         stlink_calculate_pagesize(sl, addr);
 556         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 557                 fprintf(stderr, "flash_add_block: unaligned block\n");
 558                 return -1;
 559         }
 560
 561         struct flash_block* new = malloc(sizeof(struct flash_block));
 562         new->next = flash_root;
 563
 564         new->addr   = addr;
 565         new->length = length;
 566         new->data   = calloc(length, 1);
 567
 568         flash_root = new;
 569
 570         return 0;
 571 }
 572
 573 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 574         unsigned int fit_blocks = 0, fit_length = 0;
 575
 576         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 577                 /* Block: ------X------Y--------
 578                  * Data:            a-----b
 579                  *                a--b
 580                  *            a-----------b
 581                  * Block intersects with data, if:
 582                  *  a < Y && b > x
 583                  */
 584
 585                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 586                 unsigned a = addr, b = addr + length;
 587                 if(a < Y && b > X) {
 588                         // from start of the block
 589                         unsigned start = (a > X ? a : X) - X;
 590                         unsigned end   = (b > Y ? Y : b) - X;
 591
 592                         memcpy(fb->data + start, data, end - start);
 593
 594                         fit_blocks++;
 595                         fit_length += end - start;
 596                 }
 597         }
 598
 599         if(fit_blocks == 0) {
 600                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 601                 return -1;
 602         }
 603
 604         if(fit_length != length) {
 605                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 606                         addr, length, fit_length);
 607                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int flash_go(stlink_t *sl) {
 614         int error = -1;
 615
 616         // Some kinds of clock settings do not allow writing to flash.
 617         stlink_reset(sl);
 618
 619         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 620                 #ifdef DEBUG
 621                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 622                 #endif
 623
 624                 unsigned length = fb->length;
 625                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 626
 627                         //Update FLASH_PAGE
 628                         stlink_calculate_pagesize(sl, page);
 629
 630                         #ifdef DEBUG
 631                         printf("flash_do: page %08x\n", page);
 632                         #endif
 633
 634                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 635                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 636                                 goto error;
 637                         }
 638         }
 639
 640         stlink_reset(sl);
 641
 642         error = 0;
 643
 644 error:
 645         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 646                 next = fb->next;
 647                 free(fb->data);
 648                 free(fb);
 649         }
 650
 651         flash_root = NULL;
 652
 653         return error;
 654 }
 655
 656 int serve(stlink_t *sl, st_state_t *st) {
 657         int sock = socket(AF_INET, SOCK_STREAM, 0);
 658         if(sock < 0) {
 659                 perror("socket");
 660                 return 1;
 661         }
 662
 663         unsigned int val = 1;
 664         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 665
 666         struct sockaddr_in serv_addr;
 667         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 668         serv_addr.sin_family = AF_INET;
 669         serv_addr.sin_addr.s_addr = INADDR_ANY;
 670         serv_addr.sin_port = htons(st->listen_port);
 671
 672         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 673                 perror("bind");
 674                 return 1;
 675         }
 676
 677         if(listen(sock, 5) < 0) {
 678                 perror("listen");
 679                 return 1;
 680         }
 681
 682         stlink_force_debug(sl);
 683         stlink_reset(sl);
 684         init_code_breakpoints(sl);
 685         init_data_watchpoints(sl);
 686
 687         printf("Listening at *:%d...\n", st->listen_port);
 688
 689         int client = accept(sock, NULL, NULL);
 690         //signal (SIGINT, SIG_DFL);
 691         if(client < 0) {
 692                 perror("accept");
 693                 return 1;
 694         }
 695
 696         close(sock);
 697
 698         printf("GDB connected.\n");
 699
 700         /*
 701          * To allow resetting the chip from GDB it is required to
 702          * emulate attaching and detaching to target.
 703          */
 704         unsigned int attached = 1;
 705
 706         while(1) {
 707                 char* packet;
 708
 709                 int status = gdb_recv_packet(client, &packet);
 710                 if(status < 0) {
 711                         fprintf(stderr, "cannot recv: %d\n", status);
 712                         return 1;
 713                 }
 714
 715                 #ifdef DEBUG
 716                 printf("recv: %s\n", packet);
 717                 #endif
 718
 719                 char* reply = NULL;
 720                 reg regp;
 721
 722                 switch(packet[0]) {
 723                 case 'q': {
 724                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 725                                 reply = strdup("");
 726                                 break;
 727                         }
 728
 729                         char *separator = strstr(packet, ":"), *params = "";
 730                         if(separator == NULL) {
 731                                 separator = packet + strlen(packet);
 732                         } else {
 733                                 params = separator + 1;
 734                         }
 735
 736                         unsigned queryNameLength = (separator - &packet[1]);
 737                         char* queryName = calloc(queryNameLength + 1, 1);
 738                         strncpy(queryName, &packet[1], queryNameLength);
 739
 740                         #ifdef DEBUG
 741                         printf("query: %s;%s\n", queryName, params);
 742                         #endif
 743
 744                         if(!strcmp(queryName, "Supported")) {
 745                 if(sl->chip_id==STM32_CHIPID_F4) {
 746                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 747                 }
 748                 else {
 749                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 750                 }
 751                         } else if(!strcmp(queryName, "Xfer")) {
 752                                 char *type, *op, *__s_addr, *s_length;
 753                                 char *tok = params;
 754                                 char *annex __attribute__((unused));
 755
 756                                 type     = strsep(&tok, ":");
 757                                 op       = strsep(&tok, ":");
 758                                 annex    = strsep(&tok, ":");
 759                                 __s_addr   = strsep(&tok, ",");
 760                                 s_length = tok;
 761
 762                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 763                                        length = strtoul(s_length, NULL, 16);
 764
 765                                 #ifdef DEBUG
 766                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 767                                         type, op, annex, addr, length);
 768                                 #endif
 769
 770                                 const char* data = NULL;
 771
 772                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 773                                         data = current_memory_map;
 774
 775                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 776                                         data = target_description_F4;
 777
 778                                 if(data) {
 779                                         unsigned data_length = strlen(data);
 780                                         if(addr + length > data_length)
 781                                                 length = data_length - addr;
 782
 783                                         if(length == 0) {
 784                                                 reply = strdup("l");
 785                                         } else {
 786                                                 reply = calloc(length + 2, 1);
 787                                                 reply[0] = 'm';
 788                                                 strncpy(&reply[1], data, length);
 789                                         }
 790                                 }
 791                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 792                                 // Rcmd uses the wrong separator
 793                                 char *separator = strstr(packet, ","), *params = "";
 794                                 if(separator == NULL) {
 795                                         separator = packet + strlen(packet);
 796                                 } else {
 797                                         params = separator + 1;
 798                                 }
 799
 800
 801                                 if (!strncmp(params,"726573756d65",12)) {// resume
 802 #ifdef DEBUG
 803                                         printf("Rcmd: resume\n");
 804 #endif
 805                                         stlink_run(sl);
 806
 807                                         reply = strdup("OK");
 808                 } else if (!strncmp(params,"68616c74",8)) { //halt
 809                                         reply = strdup("OK");
 810
 811                                         stlink_force_debug(sl);
 812
 813 #ifdef DEBUG
 814                                         printf("Rcmd: halt\n");
 815 #endif
 816                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 817                                         reply = strdup("OK");
 818
 819                                         stlink_jtag_reset(sl, 1);
 820                                         stlink_jtag_reset(sl, 0);
 821                                         stlink_force_debug(sl);
 822
 823 #ifdef DEBUG
 824                                         printf("Rcmd: jtag_reset\n");
 825 #endif
 826                 } else if (!strncmp(params,"7265736574",10)) { //reset
 827                                         reply = strdup("OK");
 828
 829                                         stlink_force_debug(sl);
 830                                         stlink_reset(sl);
 831                                         init_code_breakpoints(sl);
 832                                         init_data_watchpoints(sl);
 833
 834 #ifdef DEBUG
 835                                         printf("Rcmd: reset\n");
 836 #endif
 837                                 } else {
 838 #ifdef DEBUG
 839                                         printf("Rcmd: %s\n", params);
 840 #endif
 841
 842                                 }
 843
 844                         }
 845
 846                         if(reply == NULL)
 847                                 reply = strdup("");
 848
 849                         free(queryName);
 850
 851                         break;
 852                 }
 853
 854                 case 'v': {
 855                         char *params = NULL;
 856                         char *cmdName = strtok_r(packet, ":;", &params);
 857
 858                         cmdName++; // vCommand -> Command
 859
 860                         if(!strcmp(cmdName, "FlashErase")) {
 861                                 char *__s_addr, *s_length;
 862                                 char *tok = params;
 863
 864                                 __s_addr   = strsep(&tok, ",");
 865                                 s_length = tok;
 866
 867                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 868                                        length = strtoul(s_length, NULL, 16);
 869
 870                                 #ifdef DEBUG
 871                                 printf("FlashErase: addr:%08x,len:%04x\n",
 872                                         addr, length);
 873                                 #endif
 874
 875                                 if(flash_add_block(addr, length, sl) < 0) {
 876                                         reply = strdup("E00");
 877                                 } else {
 878                                         reply = strdup("OK");
 879                                 }
 880                         } else if(!strcmp(cmdName, "FlashWrite")) {
 881                                 char *__s_addr, *data;
 882                                 char *tok = params;
 883
 884                                 __s_addr = strsep(&tok, ":");
 885                                 data   = tok;
 886
 887                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 888                                 unsigned data_length = status - (data - packet);
 889
 890                                 // Length of decoded data cannot be more than
 891                                 // encoded, as escapes are removed.
 892                                 // Additional byte is reserved for alignment fix.
 893                                 uint8_t *decoded = calloc(data_length + 1, 1);
 894                                 unsigned dec_index = 0;
 895                                 for(unsigned int i = 0; i < data_length; i++) {
 896                                         if(data[i] == 0x7d) {
 897                                                 i++;
 898                                                 decoded[dec_index++] = data[i] ^ 0x20;
 899                                         } else {
 900                                                 decoded[dec_index++] = data[i];
 901                                         }
 902                                 }
 903
 904                                 // Fix alignment
 905                                 if(dec_index % 2 != 0)
 906                                         dec_index++;
 907
 908                                 #ifdef DEBUG
 909                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 910                                 #endif
 911
 912                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 913                                         reply = strdup("E00");
 914                                 } else {
 915                                         reply = strdup("OK");
 916                                 }
 917                         } else if(!strcmp(cmdName, "FlashDone")) {
 918                                 if(flash_go(sl) < 0) {
 919                                         reply = strdup("E00");
 920                                 } else {
 921                                         reply = strdup("OK");
 922                                 }
 923                         } else if(!strcmp(cmdName, "Kill")) {
 924                                 attached = 0;
 925
 926                                 reply = strdup("OK");
 927                         }
 928
 929                         if(reply == NULL)
 930                                 reply = strdup("");
 931
 932                         break;
 933                 }
 934
 935                 case 'c':
 936                         stlink_run(sl);
 937
 938                         while(1) {
 939                                 int status = gdb_check_for_interrupt(client);
 940                                 if(status < 0) {
 941                                         fprintf(stderr, "cannot check for int: %d\n", status);
 942                                         return 1;
 943                                 }
 944
 945                                 if(status == 1) {
 946                                         stlink_force_debug(sl);
 947                                         break;
 948                                 }
 949
 950                                 stlink_status(sl);
 951                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 952                                         break;
 953                                 }
 954
 955                                 usleep(100000);
 956                         }
 957
 958                         reply = strdup("S05"); // TRAP
 959                         break;
 960
 961                 case 's':
 962                         stlink_step(sl);
 963
 964                         reply = strdup("S05"); // TRAP
 965                         break;
 966
 967                 case '?':
 968                         if(attached) {
 969                                 reply = strdup("S05"); // TRAP
 970                         } else {
 971                                 /* Stub shall reply OK if not attached. */
 972                                 reply = strdup("OK");
 973                         }
 974                         break;
 975
 976                 case 'g':
 977                         stlink_read_all_regs(sl, &regp);
 978
 979                         reply = calloc(8 * 16 + 1, 1);
 980                         for(int i = 0; i < 16; i++)
 981                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 982
 983                         break;
 984
 985                 case 'p': {
 986                         unsigned id = strtoul(&packet[1], NULL, 16);
 987                         unsigned myreg = 0xDEADDEAD;
 988
 989                         if(id < 16) {
 990                                 stlink_read_reg(sl, id, &regp);
 991                                 myreg = htonl(regp.r[id]);
 992                         } else if(id == 0x19) {
 993                                 stlink_read_reg(sl, 16, &regp);
 994                                 myreg = htonl(regp.xpsr);
 995                         } else if(id == 0x1A) {
 996                                 stlink_read_reg(sl, 17, &regp);
 997                                 myreg = htonl(regp.main_sp);
 998                         } else if(id == 0x1B) {
 999                                 stlink_read_reg(sl, 18, &regp);
1000                                 myreg = htonl(regp.process_sp);
1001                         } else if(id == 0x1C) {
1002                                 stlink_read_unsupported_reg(sl, id, &regp);
1003                                 myreg = htonl(regp.control);
1004                         } else if(id == 0x1D) {
1005                                 stlink_read_unsupported_reg(sl, id, &regp);
1006                                 myreg = htonl(regp.faultmask);
1007                         } else if(id == 0x1E) {
1008                                 stlink_read_unsupported_reg(sl, id, &regp);
1009                                 myreg = htonl(regp.basepri);
1010                         } else if(id == 0x1F) {
1011                                 stlink_read_unsupported_reg(sl, id, &regp);
1012                                 myreg = htonl(regp.primask);
1013             } else if(id >= 0x20 && id < 0x40) {
1014                 stlink_read_unsupported_reg(sl, id, &regp);
1015                 myreg = htonl(regp.s[id-0x20]);
1016                         } else if(id == 0x40) {
1017                 stlink_read_unsupported_reg(sl, id, &regp);
1018                 myreg = htonl(regp.fpscr);
1019                         } else {
1020                                 reply = strdup("E00");
1021                         }
1022
1023                         reply = calloc(8 + 1, 1);
1024                         sprintf(reply, "%08x", myreg);
1025
1026                         break;
1027                 }
1028
1029                 case 'P': {
1030                         char* s_reg = &packet[1];
1031                         char* s_value = strstr(&packet[1], "=") + 1;
1032
1033                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1034                         unsigned value = strtoul(s_value, NULL, 16);
1035
1036                         if(reg < 16) {
1037                                 stlink_write_reg(sl, ntohl(value), reg);
1038                         } else if(reg == 0x19) {
1039                                 stlink_write_reg(sl, ntohl(value), 16);
1040                         } else if(reg == 0x1A) {
1041                                 stlink_write_reg(sl, ntohl(value), 17);
1042                         } else if(reg == 0x1B) {
1043                                 stlink_write_reg(sl, ntohl(value), 18);
1044                         } else if(reg == 0x1C) {
1045                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1046                         } else if(reg == 0x1D) {
1047                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1048                         } else if(reg == 0x1E) {
1049                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1050                         } else if(reg == 0x1F) {
1051                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1052             } else if(reg >= 0x20 && reg < 0x40) {
1053                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1054                         } else if(reg == 0x40) {
1055                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1056                         } else {
1057                                 reply = strdup("E00");
1058                         }
1059
1060                         if(!reply) {
1061                                 reply = strdup("OK");
1062                         }
1063
1064                         break;
1065                 }
1066
1067                 case 'G':
1068                         for(int i = 0; i < 16; i++) {
1069                                 char str[9] = {0};
1070                                 strncpy(str, &packet[1 + i * 8], 8);
1071                                 uint32_t reg = strtoul(str, NULL, 16);
1072                                 stlink_write_reg(sl, ntohl(reg), i);
1073                         }
1074
1075                         reply = strdup("OK");
1076                         break;
1077
1078                 case 'm': {
1079                         char* s_start = &packet[1];
1080                         char* s_count = strstr(&packet[1], ",") + 1;
1081
1082                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1083                         unsigned     count = strtoul(s_count, NULL, 16);
1084
1085                         unsigned adj_start = start % 4;
1086                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1087
1088                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1089
1090                         reply = calloc(count * 2 + 1, 1);
1091                         for(unsigned int i = 0; i < count; i++) {
1092                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1093                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1094                         }
1095
1096                         break;
1097                 }
1098
1099                 case 'M': {
1100                         char* s_start = &packet[1];
1101                         char* s_count = strstr(&packet[1], ",") + 1;
1102                         char* hexdata = strstr(packet, ":") + 1;
1103
1104                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1105                         unsigned     count = strtoul(s_count, NULL, 16);
1106
1107                         if(start % 4) {
1108                           unsigned align_count = 4 - start % 4;
1109                           if (align_count > count) align_count = count;
1110                           for(unsigned int i = 0; i < align_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_mem8(sl, start, align_count);
1116                           start += align_count;
1117                           count -= align_count;
1118                           hexdata += 2*align_count;
1119                         }
1120
1121                         if(count - count % 4) {
1122                           unsigned aligned_count = count - count % 4;
1123
1124                           for(unsigned int i = 0; i < aligned_count; i ++) {
1125                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1126                             uint8_t byte = strtoul(hex, NULL, 16);
1127                             sl->q_buf[i] = byte;
1128                           }
1129                           stlink_write_mem32(sl, start, aligned_count);
1130                           count -= aligned_count;
1131                           start += aligned_count;
1132                           hexdata += 2*aligned_count;
1133                         }
1134
1135                         if(count) {
1136                           for(unsigned int i = 0; i < count; i ++) {
1137                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1138                             uint8_t byte = strtoul(hex, NULL, 16);
1139                             sl->q_buf[i] = byte;
1140                           }
1141                           stlink_write_mem8(sl, start, count);
1142                         }
1143                         reply = strdup("OK");
1144                         break;
1145                 }
1146
1147                 case 'Z': {
1148                         char *endptr;
1149                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1150                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1151
1152                         switch (packet[1]) {
1153                                 case '1':
1154                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1155                                         reply = strdup("E00");
1156                                 } else {
1157                                         reply = strdup("OK");
1158                                 }
1159                                 break;
1160
1161                                 case '2':   // insert write watchpoint
1162                                 case '3':   // insert read  watchpoint
1163                                 case '4':   // insert access watchpoint
1164                                 {
1165                                         enum watchfun wf;
1166                                         if(packet[1] == '2') {
1167                                                 wf = WATCHWRITE;
1168                                         } else if(packet[1] == '3') {
1169                                                 wf = WATCHREAD;
1170                                         } else {
1171                                                 wf = WATCHACCESS;
1172                                         }
1173
1174                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1175                         reply = strdup("E00");
1176                     } else {
1177                         reply = strdup("OK");
1178                         break;
1179                     }
1180                                 }
1181
1182                                 default:
1183                                 reply = strdup("");
1184                         }
1185                         break;
1186                 }
1187                 case 'z': {
1188                         char *endptr;
1189                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1190                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1191
1192                         switch (packet[1]) {
1193                                 case '1': // remove breakpoint
1194                                 update_code_breakpoint(sl, addr, 0);
1195                                 reply = strdup("OK");
1196                                 break;
1197
1198                                 case '2' : // remove write watchpoint
1199                                 case '3' : // remove read watchpoint
1200                                 case '4' : // remove access watchpoint
1201                                 if(delete_data_watchpoint(sl, addr) < 0) {
1202                                         reply = strdup("E00");
1203                                 } else {
1204                                         reply = strdup("OK");
1205                                         break;
1206                                 }
1207
1208                                 default:
1209                                 reply = strdup("");
1210                         }
1211                         break;
1212                 }
1213
1214                 case '!': {
1215                         /*
1216                          * Enter extended mode which allows restarting.
1217                          * We do support that always.
1218                          */
1219
1220                         /*
1221                          * Also, set to persistent mode
1222                          * to allow GDB disconnect.
1223                          */
1224                         st->persistent = 1;
1225
1226                         reply = strdup("OK");
1227
1228                         break;
1229                 }
1230
1231                 case 'R': {
1232                         /* Reset the core. */
1233
1234                         stlink_reset(sl);
1235                         init_code_breakpoints(sl);
1236                         init_data_watchpoints(sl);
1237
1238                         attached = 1;
1239
1240                         reply = strdup("OK");
1241
1242                         break;
1243                 }
1244
1245                 default:
1246                         reply = strdup("");
1247                 }
1248
1249                 if(reply) {
1250                         #ifdef DEBUG
1251                         printf("send: %s\n", reply);
1252                         #endif
1253
1254                         int result = gdb_send_packet(client, reply);
1255                         if(result != 0) {
1256                                 fprintf(stderr, "cannot send: %d\n", result);
1257                                 free(reply);
1258                                 free(packet);
1259                                 return 1;
1260                         }
1261
1262                         free(reply);
1263                 }
1264
1265                 free(packet);
1266         }
1267
1268         return 0;
1269 }