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 int parse_options(int argc, char** argv, st_state_t *st) {
  71     static struct option long_options[] = {
  72         {"help", no_argument, NULL, 'h'},
  73         {"verbose", optional_argument, NULL, 'v'},
  74         {"device", required_argument, NULL, 'd'},
  75         {"stlink_version", required_argument, NULL, 's'},
  76         {"stlinkv1", no_argument, NULL, '1'},
  77                 {"listen_port", required_argument, NULL, 'p'},
  78                 {"multi", optional_argument, NULL, 'm'},
  79         {0, 0, 0, 0},
  80     };
  81         const char * help_str = "%s - usage:\n\n"
  82         "  -h, --help\t\tPrint this help\n"
  83         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  84         "  -v, --verbose\tspecify generally verbose logging\n"
  85         "  -d <device>, --device=/dev/stlink2_1\n"
  86         "\t\t\tWhere is your stlink device connected?\n"
  87         "  -s X, --stlink_version=X\n"
  88         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  89         "  -1, --stlinkv1\tForce stlink version 1\n"
  90         "  -p 4242, --listen_port=1234\n"
  91         "\t\t\tSet the gdb server listen port. "
  92         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  93     "  -m, --multi\n"
  94     "\t\t\tSet gdb server to extended mode.\n"
  95     "\t\t\tst-util will continue listening for connections after disconnect.\n"
  96         ;
  97
  98
  99     int option_index = 0;
 100     int c;
 101     int q;
 102     while ((c = getopt_long(argc, argv, "hv::d:s:1p:m", long_options, &option_index)) != -1) {
 103         switch (c) {
 104         case 0:
 105             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 106             printf("option %s", long_options[option_index].name);
 107             if (optarg) {
 108                 printf(" with arg %s", optarg);
 109             }
 110             printf("\n");
 111             break;
 112         case 'h':
 113             printf(help_str, argv[0]);
 114             exit(EXIT_SUCCESS);
 115             break;
 116         case 'v':
 117             if (optarg) {
 118                 st->logging_level = atoi(optarg);
 119             } else {
 120                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 121             }
 122             break;
 123         case 'd':
 124             if (strlen(optarg) > sizeof (st->devicename)) {
 125                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 126             } else {
 127                 strcpy(st->devicename, optarg);
 128             }
 129             break;
 130                 case '1':
 131                         st->stlink_version = 1;
 132                         break;
 133                 case 's':
 134                         sscanf(optarg, "%i", &q);
 135                         if (q < 0 || q > 2) {
 136                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 137                                 exit(EXIT_FAILURE);
 138                         }
 139                         st->stlink_version = q;
 140                         break;
 141                 case 'p':
 142                         sscanf(optarg, "%i", &q);
 143                         if (q < 0) {
 144                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 145                                 exit(EXIT_FAILURE);
 146                         }
 147                         st->listen_port = q;
 148                         break;
 149                 case 'm':
 150                         st->persistent = 1;
 151                         break;
 152         }
 153     }
 154
 155     if (optind < argc) {
 156         printf("non-option ARGV-elements: ");
 157         while (optind < argc)
 158             printf("%s ", argv[optind++]);
 159         printf("\n");
 160     }
 161     return 0;
 162 }
 163
 164
 165 int main(int argc, char** argv) {
 166
 167         stlink_t *sl = NULL;
 168
 169         st_state_t state;
 170         memset(&state, 0, sizeof(state));
 171         // set defaults...
 172         state.stlink_version = 2;
 173         state.logging_level = DEFAULT_LOGGING_LEVEL;
 174         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 175         parse_options(argc, argv, &state);
 176         switch (state.stlink_version) {
 177         case 2:
 178                 sl = stlink_open_usb(state.logging_level);
 179                 if(sl == NULL) return 1;
 180                 break;
 181         case 1:
 182                 sl = stlink_v1_open(state.logging_level);
 183                 if(sl == NULL) return 1;
 184                 break;
 185     }
 186
 187     connected_stlink = sl;
 188     signal(SIGINT, &cleanup);
 189
 190         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 191
 192         sl->verbose=0;
 193
 194         current_memory_map = make_memory_map(sl);
 195
 196 #ifdef __MINGW32__
 197         WSADATA wsadata;
 198         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 199                 goto winsock_error;
 200         }
 201 #endif
 202
 203         do {
 204                 serve(sl, &state);
 205         } while (state.persistent);
 206
 207 #ifdef __MINGW32__
 208 winsock_error:
 209         WSACleanup();
 210 #endif
 211
 212         /* Switch back to mass storage mode before closing. */
 213         stlink_run(sl);
 214         stlink_exit_debug_mode(sl);
 215         stlink_close(sl);
 216
 217         return 0;
 218 }
 219
 220 static const char* const target_description_F4 =
 221     "<?xml version=\"1.0\"?>"
 222     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 223     "<target version=\"1.0\">"
 224     "   <architecture>arm</architecture>"
 225     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 226     "       <reg name=\"r0\" bitsize=\"32\"/>"
 227     "       <reg name=\"r1\" bitsize=\"32\"/>"
 228     "       <reg name=\"r2\" bitsize=\"32\"/>"
 229     "       <reg name=\"r3\" bitsize=\"32\"/>"
 230     "       <reg name=\"r4\" bitsize=\"32\"/>"
 231     "       <reg name=\"r5\" bitsize=\"32\"/>"
 232     "       <reg name=\"r6\" bitsize=\"32\"/>"
 233     "       <reg name=\"r7\" bitsize=\"32\"/>"
 234     "       <reg name=\"r8\" bitsize=\"32\"/>"
 235     "       <reg name=\"r9\" bitsize=\"32\"/>"
 236     "       <reg name=\"r10\" bitsize=\"32\"/>"
 237     "       <reg name=\"r11\" bitsize=\"32\"/>"
 238     "       <reg name=\"r12\" bitsize=\"32\"/>"
 239     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 240     "       <reg name=\"lr\" bitsize=\"32\"/>"
 241     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 242     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 243     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 244     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 245     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 246     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 247     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 248     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 249     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 250     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 251     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 252     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 253     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 254     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 255     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 256     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 257     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 258     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 259     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 260     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 261     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 262     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 263     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 264     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 271     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 272     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 282     "   </feature>"
 283     "</target>";
 284
 285 static const char* const memory_map_template_F4 =
 286   "<?xml version=\"1.0\"?>"
 287   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 288   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 289   "<memory-map>"
 290   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 291   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 292   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 293   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 294   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 295   "  </memory>"
 296   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 297   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 298   "  </memory>"
 299   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 300   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 301   "  </memory>"
 302   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 303   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 304   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 305   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 306   "</memory-map>";
 307
 308 static const char* const memory_map_template =
 309   "<?xml version=\"1.0\"?>"
 310   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 311   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 312   "<memory-map>"
 313   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 314   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 315   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 316   "    <property name=\"blocksize\">0x%zx</property>"
 317   "  </memory>"
 318   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 319   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 320   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 321   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 322   "</memory-map>";
 323
 324 char* make_memory_map(stlink_t *sl) {
 325         /* This will be freed in serve() */
 326         char* map = malloc(4096);
 327         map[0] = '\0';
 328
 329         if(sl->chip_id==STM32_CHIPID_F4) {
 330         strcpy(map, memory_map_template_F4);
 331     } else {
 332         snprintf(map, 4096, memory_map_template,
 333                         sl->flash_size,
 334                         sl->sram_size,
 335                         sl->flash_size, sl->flash_pgsz,
 336                         sl->sys_base, sl->sys_size);
 337     }
 338         return map;
 339 }
 340
 341
 342 /*
 343  * DWT_COMP0     0xE0001020
 344  * DWT_MASK0     0xE0001024
 345  * DWT_FUNCTION0 0xE0001028
 346  * DWT_COMP1     0xE0001030
 347  * DWT_MASK1     0xE0001034
 348  * DWT_FUNCTION1 0xE0001038
 349  * DWT_COMP2     0xE0001040
 350  * DWT_MASK2     0xE0001044
 351  * DWT_FUNCTION2 0xE0001048
 352  * DWT_COMP3     0xE0001050
 353  * DWT_MASK3     0xE0001054
 354  * DWT_FUNCTION3 0xE0001058
 355  */
 356
 357 #define DATA_WATCH_NUM 4
 358
 359 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 360
 361 struct code_hw_watchpoint {
 362         stm32_addr_t addr;
 363         uint8_t mask;
 364         enum watchfun fun;
 365 };
 366
 367 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 368
 369 static void init_data_watchpoints(stlink_t *sl) {
 370         #ifdef DEBUG
 371         printf("init watchpoints\n");
 372         #endif
 373
 374         // set trcena in debug command to turn on dwt unit
 375         stlink_write_debug32(sl, 0xE000EDFC,
 376                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 377
 378         // make sure all watchpoints are cleared
 379         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 380                 data_watches[i].fun = WATCHDISABLED;
 381                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 382         }
 383 }
 384
 385 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 386 {
 387         int i = 0;
 388         uint32_t mask;
 389
 390         // computer mask
 391         // find a free watchpoint
 392         // configure
 393
 394         mask = -1;
 395         i = len;
 396         while(i) {
 397                 i >>= 1;
 398                 mask++;
 399         }
 400
 401         if((mask != (uint32_t)-1) && (mask < 16)) {
 402                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 403                         // is this an empty slot ?
 404                         if(data_watches[i].fun == WATCHDISABLED) {
 405                                 #ifdef DEBUG
 406                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 407                                 #endif
 408
 409                                 data_watches[i].fun = wf;
 410                                 data_watches[i].addr = addr;
 411                                 data_watches[i].mask = mask;
 412
 413                                 // insert comparator address
 414                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 415
 416                                 // insert mask
 417                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 418
 419                                 // insert function
 420                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 421
 422                                 // just to make sure the matched bit is clear !
 423                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 424                                 return 0;
 425                         }
 426                 }
 427         }
 428
 429         #ifdef DEBUG
 430         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 431         #endif
 432         return -1;
 433 }
 434
 435 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 436 {
 437         int i;
 438
 439         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 440                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 441                         #ifdef DEBUG
 442                         printf("delete watchpoint %d addr %x\n", i, addr);
 443                         #endif
 444
 445                         data_watches[i].fun = WATCHDISABLED;
 446                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 447
 448                         return 0;
 449                 }
 450         }
 451
 452         #ifdef DEBUG
 453         printf("failure: delete watchpoint addr %x\n", addr);
 454         #endif
 455
 456         return -1;
 457 }
 458
 459 #define CODE_BREAK_NUM  6
 460 #define CODE_BREAK_LOW  0x01
 461 #define CODE_BREAK_HIGH 0x02
 462
 463 struct code_hw_breakpoint {
 464         stm32_addr_t addr;
 465         int          type;
 466 };
 467
 468 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 469
 470 static void init_code_breakpoints(stlink_t *sl) {
 471         memset(sl->q_buf, 0, 4);
 472         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 473         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 474         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 475
 476         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 477                 code_breaks[i].type = 0;
 478                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 479         }
 480 }
 481
 482 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 483         stm32_addr_t fpb_addr = addr & ~0x3;
 484         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 485
 486         if(addr & 1) {
 487                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 488                 return -1;
 489         }
 490
 491         int id = -1;
 492         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 493                 if(fpb_addr == code_breaks[i].addr ||
 494                         (set && code_breaks[i].type == 0)) {
 495                         id = i;
 496                         break;
 497                 }
 498         }
 499
 500         if(id == -1) {
 501                 if(set) return -1; // Free slot not found
 502                 else    return 0;  // Breakpoint is already removed
 503         }
 504
 505         struct code_hw_breakpoint* brk = &code_breaks[id];
 506
 507         brk->addr = fpb_addr;
 508
 509         if(set) brk->type |= type;
 510         else    brk->type &= ~type;
 511
 512         if(brk->type == 0) {
 513                 #ifdef DEBUG
 514                 printf("clearing hw break %d\n", id);
 515                 #endif
 516
 517                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 518         } else {
 519                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 520
 521                 #ifdef DEBUG
 522                 printf("setting hw break %d at %08x (%d)\n",
 523                         id, brk->addr, brk->type);
 524                 printf("reg %08x \n",
 525                         mask);
 526                 #endif
 527
 528                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 529         }
 530
 531         return 0;
 532 }
 533
 534
 535 struct flash_block {
 536         stm32_addr_t addr;
 537         unsigned     length;
 538         uint8_t*     data;
 539
 540         struct flash_block* next;
 541 };
 542
 543 static struct flash_block* flash_root;
 544
 545 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 546
 547         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 548                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 549                 return -1;
 550         }
 551
 552         stlink_calculate_pagesize(sl, addr);
 553         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 554                 fprintf(stderr, "flash_add_block: unaligned block\n");
 555                 return -1;
 556         }
 557
 558         struct flash_block* new = malloc(sizeof(struct flash_block));
 559         new->next = flash_root;
 560
 561         new->addr   = addr;
 562         new->length = length;
 563         new->data   = calloc(length, 1);
 564
 565         flash_root = new;
 566
 567         return 0;
 568 }
 569
 570 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 571         unsigned int fit_blocks = 0, fit_length = 0;
 572
 573         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 574                 /* Block: ------X------Y--------
 575                  * Data:            a-----b
 576                  *                a--b
 577                  *            a-----------b
 578                  * Block intersects with data, if:
 579                  *  a < Y && b > x
 580                  */
 581
 582                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 583                 unsigned a = addr, b = addr + length;
 584                 if(a < Y && b > X) {
 585                         // from start of the block
 586                         unsigned start = (a > X ? a : X) - X;
 587                         unsigned end   = (b > Y ? Y : b) - X;
 588
 589                         memcpy(fb->data + start, data, end - start);
 590
 591                         fit_blocks++;
 592                         fit_length += end - start;
 593                 }
 594         }
 595
 596         if(fit_blocks == 0) {
 597                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 598                 return -1;
 599         }
 600
 601         if(fit_length != length) {
 602                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 603                         addr, length, fit_length);
 604                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int flash_go(stlink_t *sl) {
 611         int error = -1;
 612
 613         // Some kinds of clock settings do not allow writing to flash.
 614         stlink_reset(sl);
 615
 616         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 617                 #ifdef DEBUG
 618                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 619                 #endif
 620
 621                 unsigned length = fb->length;
 622                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 623
 624                         //Update FLASH_PAGE
 625                         stlink_calculate_pagesize(sl, page);
 626
 627                         #ifdef DEBUG
 628                         printf("flash_do: page %08x\n", page);
 629                         #endif
 630
 631                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 632                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 633                                 goto error;
 634                         }
 635         }
 636
 637         stlink_reset(sl);
 638
 639         error = 0;
 640
 641 error:
 642         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 643                 next = fb->next;
 644                 free(fb->data);
 645                 free(fb);
 646         }
 647
 648         flash_root = NULL;
 649
 650         return error;
 651 }
 652
 653 int serve(stlink_t *sl, st_state_t *st) {
 654         int sock = socket(AF_INET, SOCK_STREAM, 0);
 655         if(sock < 0) {
 656                 perror("socket");
 657                 return 1;
 658         }
 659
 660         unsigned int val = 1;
 661         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 662
 663         struct sockaddr_in serv_addr;
 664         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 665         serv_addr.sin_family = AF_INET;
 666         serv_addr.sin_addr.s_addr = INADDR_ANY;
 667         serv_addr.sin_port = htons(st->listen_port);
 668
 669         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 670                 perror("bind");
 671                 return 1;
 672         }
 673
 674         if(listen(sock, 5) < 0) {
 675                 perror("listen");
 676                 return 1;
 677         }
 678
 679         stlink_force_debug(sl);
 680         stlink_reset(sl);
 681         init_code_breakpoints(sl);
 682         init_data_watchpoints(sl);
 683
 684         printf("Listening at *:%d...\n", st->listen_port);
 685
 686         int client = accept(sock, NULL, NULL);
 687         //signal (SIGINT, SIG_DFL);
 688         if(client < 0) {
 689                 perror("accept");
 690                 return 1;
 691         }
 692
 693         close(sock);
 694
 695         printf("GDB connected.\n");
 696
 697         /*
 698          * To allow resetting the chip from GDB it is required to
 699          * emulate attaching and detaching to target.
 700          */
 701         unsigned int attached = 1;
 702
 703         while(1) {
 704                 char* packet;
 705
 706                 int status = gdb_recv_packet(client, &packet);
 707                 if(status < 0) {
 708                         fprintf(stderr, "cannot recv: %d\n", status);
 709                         return 1;
 710                 }
 711
 712                 #ifdef DEBUG
 713                 printf("recv: %s\n", packet);
 714                 #endif
 715
 716                 char* reply = NULL;
 717                 reg regp;
 718
 719                 switch(packet[0]) {
 720                 case 'q': {
 721                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 722                                 reply = strdup("");
 723                                 break;
 724                         }
 725
 726                         char *separator = strstr(packet, ":"), *params = "";
 727                         if(separator == NULL) {
 728                                 separator = packet + strlen(packet);
 729                         } else {
 730                                 params = separator + 1;
 731                         }
 732
 733                         unsigned queryNameLength = (separator - &packet[1]);
 734                         char* queryName = calloc(queryNameLength + 1, 1);
 735                         strncpy(queryName, &packet[1], queryNameLength);
 736
 737                         #ifdef DEBUG
 738                         printf("query: %s;%s\n", queryName, params);
 739                         #endif
 740
 741                         if(!strcmp(queryName, "Supported")) {
 742                 if(sl->chip_id==STM32_CHIPID_F4) {
 743                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 744                 }
 745                 else {
 746                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 747                 }
 748                         } else if(!strcmp(queryName, "Xfer")) {
 749                                 char *type, *op, *__s_addr, *s_length;
 750                                 char *tok = params;
 751                                 char *annex __attribute__((unused));
 752
 753                                 type     = strsep(&tok, ":");
 754                                 op       = strsep(&tok, ":");
 755                                 annex    = strsep(&tok, ":");
 756                                 __s_addr   = strsep(&tok, ",");
 757                                 s_length = tok;
 758
 759                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 760                                        length = strtoul(s_length, NULL, 16);
 761
 762                                 #ifdef DEBUG
 763                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 764                                         type, op, annex, addr, length);
 765                                 #endif
 766
 767                                 const char* data = NULL;
 768
 769                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 770                                         data = current_memory_map;
 771
 772                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 773                                         data = target_description_F4;
 774
 775                                 if(data) {
 776                                         unsigned data_length = strlen(data);
 777                                         if(addr + length > data_length)
 778                                                 length = data_length - addr;
 779
 780                                         if(length == 0) {
 781                                                 reply = strdup("l");
 782                                         } else {
 783                                                 reply = calloc(length + 2, 1);
 784                                                 reply[0] = 'm';
 785                                                 strncpy(&reply[1], data, length);
 786                                         }
 787                                 }
 788                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 789                                 // Rcmd uses the wrong separator
 790                                 char *separator = strstr(packet, ","), *params = "";
 791                                 if(separator == NULL) {
 792                                         separator = packet + strlen(packet);
 793                                 } else {
 794                                         params = separator + 1;
 795                                 }
 796
 797
 798                                 if (!strncmp(params,"726573756d65",12)) {// resume
 799 #ifdef DEBUG
 800                                         printf("Rcmd: resume\n");
 801 #endif
 802                                         stlink_run(sl);
 803
 804                                         reply = strdup("OK");
 805                 } else if (!strncmp(params,"68616c74",8)) { //halt
 806                                         reply = strdup("OK");
 807
 808                                         stlink_force_debug(sl);
 809
 810 #ifdef DEBUG
 811                                         printf("Rcmd: halt\n");
 812 #endif
 813                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 814                                         reply = strdup("OK");
 815
 816                                         stlink_jtag_reset(sl, 1);
 817                                         stlink_jtag_reset(sl, 0);
 818                                         stlink_force_debug(sl);
 819
 820 #ifdef DEBUG
 821                                         printf("Rcmd: jtag_reset\n");
 822 #endif
 823                 } else if (!strncmp(params,"7265736574",10)) { //reset
 824                                         reply = strdup("OK");
 825
 826                                         stlink_force_debug(sl);
 827                                         stlink_reset(sl);
 828                                         init_code_breakpoints(sl);
 829                                         init_data_watchpoints(sl);
 830
 831 #ifdef DEBUG
 832                                         printf("Rcmd: reset\n");
 833 #endif
 834                                 } else {
 835 #ifdef DEBUG
 836                                         printf("Rcmd: %s\n", params);
 837 #endif
 838
 839                                 }
 840
 841                         }
 842
 843                         if(reply == NULL)
 844                                 reply = strdup("");
 845
 846                         free(queryName);
 847
 848                         break;
 849                 }
 850
 851                 case 'v': {
 852                         char *params = NULL;
 853                         char *cmdName = strtok_r(packet, ":;", &params);
 854
 855                         cmdName++; // vCommand -> Command
 856
 857                         if(!strcmp(cmdName, "FlashErase")) {
 858                                 char *__s_addr, *s_length;
 859                                 char *tok = params;
 860
 861                                 __s_addr   = strsep(&tok, ",");
 862                                 s_length = tok;
 863
 864                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 865                                        length = strtoul(s_length, NULL, 16);
 866
 867                                 #ifdef DEBUG
 868                                 printf("FlashErase: addr:%08x,len:%04x\n",
 869                                         addr, length);
 870                                 #endif
 871
 872                                 if(flash_add_block(addr, length, sl) < 0) {
 873                                         reply = strdup("E00");
 874                                 } else {
 875                                         reply = strdup("OK");
 876                                 }
 877                         } else if(!strcmp(cmdName, "FlashWrite")) {
 878                                 char *__s_addr, *data;
 879                                 char *tok = params;
 880
 881                                 __s_addr = strsep(&tok, ":");
 882                                 data   = tok;
 883
 884                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 885                                 unsigned data_length = status - (data - packet);
 886
 887                                 // Length of decoded data cannot be more than
 888                                 // encoded, as escapes are removed.
 889                                 // Additional byte is reserved for alignment fix.
 890                                 uint8_t *decoded = calloc(data_length + 1, 1);
 891                                 unsigned dec_index = 0;
 892                                 for(unsigned int i = 0; i < data_length; i++) {
 893                                         if(data[i] == 0x7d) {
 894                                                 i++;
 895                                                 decoded[dec_index++] = data[i] ^ 0x20;
 896                                         } else {
 897                                                 decoded[dec_index++] = data[i];
 898                                         }
 899                                 }
 900
 901                                 // Fix alignment
 902                                 if(dec_index % 2 != 0)
 903                                         dec_index++;
 904
 905                                 #ifdef DEBUG
 906                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 907                                 #endif
 908
 909                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 910                                         reply = strdup("E00");
 911                                 } else {
 912                                         reply = strdup("OK");
 913                                 }
 914                         } else if(!strcmp(cmdName, "FlashDone")) {
 915                                 if(flash_go(sl) < 0) {
 916                                         reply = strdup("E00");
 917                                 } else {
 918                                         reply = strdup("OK");
 919                                 }
 920                         } else if(!strcmp(cmdName, "Kill")) {
 921                                 attached = 0;
 922
 923                                 reply = strdup("OK");
 924                         }
 925
 926                         if(reply == NULL)
 927                                 reply = strdup("");
 928
 929                         break;
 930                 }
 931
 932                 case 'c':
 933                         stlink_run(sl);
 934
 935                         while(1) {
 936                                 int status = gdb_check_for_interrupt(client);
 937                                 if(status < 0) {
 938                                         fprintf(stderr, "cannot check for int: %d\n", status);
 939                                         return 1;
 940                                 }
 941
 942                                 if(status == 1) {
 943                                         stlink_force_debug(sl);
 944                                         break;
 945                                 }
 946
 947                                 stlink_status(sl);
 948                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 949                                         break;
 950                                 }
 951
 952                                 usleep(100000);
 953                         }
 954
 955                         reply = strdup("S05"); // TRAP
 956                         break;
 957
 958                 case 's':
 959                         stlink_step(sl);
 960
 961                         reply = strdup("S05"); // TRAP
 962                         break;
 963
 964                 case '?':
 965                         if(attached) {
 966                                 reply = strdup("S05"); // TRAP
 967                         } else {
 968                                 /* Stub shall reply OK if not attached. */
 969                                 reply = strdup("OK");
 970                         }
 971                         break;
 972
 973                 case 'g':
 974                         stlink_read_all_regs(sl, &regp);
 975
 976                         reply = calloc(8 * 16 + 1, 1);
 977                         for(int i = 0; i < 16; i++)
 978                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 979
 980                         break;
 981
 982                 case 'p': {
 983                         unsigned id = strtoul(&packet[1], NULL, 16);
 984                         unsigned myreg = 0xDEADDEAD;
 985
 986                         if(id < 16) {
 987                                 stlink_read_reg(sl, id, &regp);
 988                                 myreg = htonl(regp.r[id]);
 989                         } else if(id == 0x19) {
 990                                 stlink_read_reg(sl, 16, &regp);
 991                                 myreg = htonl(regp.xpsr);
 992                         } else if(id == 0x1A) {
 993                                 stlink_read_reg(sl, 17, &regp);
 994                                 myreg = htonl(regp.main_sp);
 995                         } else if(id == 0x1B) {
 996                                 stlink_read_reg(sl, 18, &regp);
 997                                 myreg = htonl(regp.process_sp);
 998                         } else if(id == 0x1C) {
 999                                 stlink_read_unsupported_reg(sl, id, &regp);
1000                                 myreg = htonl(regp.control);
1001                         } else if(id == 0x1D) {
1002                                 stlink_read_unsupported_reg(sl, id, &regp);
1003                                 myreg = htonl(regp.faultmask);
1004                         } else if(id == 0x1E) {
1005                                 stlink_read_unsupported_reg(sl, id, &regp);
1006                                 myreg = htonl(regp.basepri);
1007                         } else if(id == 0x1F) {
1008                                 stlink_read_unsupported_reg(sl, id, &regp);
1009                                 myreg = htonl(regp.primask);
1010             } else if(id >= 0x20 && id < 0x40) {
1011                 stlink_read_unsupported_reg(sl, id, &regp);
1012                 myreg = htonl(regp.s[id-0x20]);
1013                         } else if(id == 0x40) {
1014                 stlink_read_unsupported_reg(sl, id, &regp);
1015                 myreg = htonl(regp.fpscr);
1016                         } else {
1017                                 reply = strdup("E00");
1018                         }
1019
1020                         reply = calloc(8 + 1, 1);
1021                         sprintf(reply, "%08x", myreg);
1022
1023                         break;
1024                 }
1025
1026                 case 'P': {
1027                         char* s_reg = &packet[1];
1028                         char* s_value = strstr(&packet[1], "=") + 1;
1029
1030                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1031                         unsigned value = strtoul(s_value, NULL, 16);
1032
1033                         if(reg < 16) {
1034                                 stlink_write_reg(sl, ntohl(value), reg);
1035                         } else if(reg == 0x19) {
1036                                 stlink_write_reg(sl, ntohl(value), 16);
1037                         } else if(reg == 0x1A) {
1038                                 stlink_write_reg(sl, ntohl(value), 17);
1039                         } else if(reg == 0x1B) {
1040                                 stlink_write_reg(sl, ntohl(value), 18);
1041                         } else if(reg == 0x1C) {
1042                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1043                         } else if(reg == 0x1D) {
1044                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1045                         } else if(reg == 0x1E) {
1046                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1047                         } else if(reg == 0x1F) {
1048                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1049             } else if(reg >= 0x20 && reg < 0x40) {
1050                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1051                         } else if(reg == 0x40) {
1052                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1053                         } else {
1054                                 reply = strdup("E00");
1055                         }
1056
1057                         if(!reply) {
1058                                 reply = strdup("OK");
1059                         }
1060
1061                         break;
1062                 }
1063
1064                 case 'G':
1065                         for(int i = 0; i < 16; i++) {
1066                                 char str[9] = {0};
1067                                 strncpy(str, &packet[1 + i * 8], 8);
1068                                 uint32_t reg = strtoul(str, NULL, 16);
1069                                 stlink_write_reg(sl, ntohl(reg), i);
1070                         }
1071
1072                         reply = strdup("OK");
1073                         break;
1074
1075                 case 'm': {
1076                         char* s_start = &packet[1];
1077                         char* s_count = strstr(&packet[1], ",") + 1;
1078
1079                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1080                         unsigned     count = strtoul(s_count, NULL, 16);
1081
1082                         unsigned adj_start = start % 4;
1083                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1084
1085                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1086
1087                         reply = calloc(count * 2 + 1, 1);
1088                         for(unsigned int i = 0; i < count; i++) {
1089                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1090                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1091                         }
1092
1093                         break;
1094                 }
1095
1096                 case 'M': {
1097                         char* s_start = &packet[1];
1098                         char* s_count = strstr(&packet[1], ",") + 1;
1099                         char* hexdata = strstr(packet, ":") + 1;
1100
1101                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1102                         unsigned     count = strtoul(s_count, NULL, 16);
1103
1104                         if(start % 4) {
1105                           unsigned align_count = 4 - start % 4;
1106                           if (align_count > count) align_count = count;
1107                           for(unsigned int i = 0; i < align_count; i ++) {
1108                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1109                                 uint8_t byte = strtoul(hex, NULL, 16);
1110                                 sl->q_buf[i] = byte;
1111                           }
1112                           stlink_write_mem8(sl, start, align_count);
1113                           start += align_count;
1114                           count -= align_count;
1115                           hexdata += 2*align_count;
1116                         }
1117
1118                         if(count - count % 4) {
1119                           unsigned aligned_count = count - count % 4;
1120
1121                           for(unsigned int i = 0; i < aligned_count; i ++) {
1122                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1123                             uint8_t byte = strtoul(hex, NULL, 16);
1124                             sl->q_buf[i] = byte;
1125                           }
1126                           stlink_write_mem32(sl, start, aligned_count);
1127                           count -= aligned_count;
1128                           start += aligned_count;
1129                           hexdata += 2*aligned_count;
1130                         }
1131
1132                         if(count) {
1133                           for(unsigned int i = 0; i < count; i ++) {
1134                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1135                             uint8_t byte = strtoul(hex, NULL, 16);
1136                             sl->q_buf[i] = byte;
1137                           }
1138                           stlink_write_mem8(sl, start, count);
1139                         }
1140                         reply = strdup("OK");
1141                         break;
1142                 }
1143
1144                 case 'Z': {
1145                         char *endptr;
1146                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1147                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1148
1149                         switch (packet[1]) {
1150                                 case '1':
1151                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1152                                         reply = strdup("E00");
1153                                 } else {
1154                                         reply = strdup("OK");
1155                                 }
1156                                 break;
1157
1158                                 case '2':   // insert write watchpoint
1159                                 case '3':   // insert read  watchpoint
1160                                 case '4':   // insert access watchpoint
1161                                 {
1162                                         enum watchfun wf;
1163                                         if(packet[1] == '2') {
1164                                                 wf = WATCHWRITE;
1165                                         } else if(packet[1] == '3') {
1166                                                 wf = WATCHREAD;
1167                                         } else {
1168                                                 wf = WATCHACCESS;
1169                                         }
1170
1171                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1172                         reply = strdup("E00");
1173                     } else {
1174                         reply = strdup("OK");
1175                         break;
1176                     }
1177                                 }
1178
1179                                 default:
1180                                 reply = strdup("");
1181                         }
1182                         break;
1183                 }
1184                 case 'z': {
1185                         char *endptr;
1186                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1187                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1188
1189                         switch (packet[1]) {
1190                                 case '1': // remove breakpoint
1191                                 update_code_breakpoint(sl, addr, 0);
1192                                 reply = strdup("OK");
1193                                 break;
1194
1195                                 case '2' : // remove write watchpoint
1196                                 case '3' : // remove read watchpoint
1197                                 case '4' : // remove access watchpoint
1198                                 if(delete_data_watchpoint(sl, addr) < 0) {
1199                                         reply = strdup("E00");
1200                                 } else {
1201                                         reply = strdup("OK");
1202                                         break;
1203                                 }
1204
1205                                 default:
1206                                 reply = strdup("");
1207                         }
1208                         break;
1209                 }
1210
1211                 case '!': {
1212                         /*
1213                          * Enter extended mode which allows restarting.
1214                          * We do support that always.
1215                          */
1216
1217                         /*
1218                          * Also, set to persistent mode
1219                          * to allow GDB disconnect.
1220                          */
1221                         st->persistent = 1;
1222
1223                         reply = strdup("OK");
1224
1225                         break;
1226                 }
1227
1228                 case 'R': {
1229                         /* Reset the core. */
1230
1231                         stlink_reset(sl);
1232                         init_code_breakpoints(sl);
1233                         init_data_watchpoints(sl);
1234
1235                         attached = 1;
1236
1237                         reply = strdup("OK");
1238
1239                         break;
1240                 }
1241
1242                 default:
1243                         reply = strdup("");
1244                 }
1245
1246                 if(reply) {
1247                         #ifdef DEBUG
1248                         printf("send: %s\n", reply);
1249                         #endif
1250
1251                         int result = gdb_send_packet(client, reply);
1252                         if(result != 0) {
1253                                 fprintf(stderr, "cannot send: %d\n", result);
1254                                 free(reply);
1255                                 free(packet);
1256                                 return 1;
1257                         }
1258
1259                         free(reply);
1260                 }
1261
1262                 free(packet);
1263         }
1264
1265         return 0;
1266 }