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     int reset;
  54 } st_state_t;
  55
  56
  57 int serve(stlink_t *sl, st_state_t *st);
  58 char* make_memory_map(stlink_t *sl);
  59
  60 #ifndef __MINGW32__
  61 static void cleanup(int signal __attribute__((unused))) {
  62     if (connected_stlink) {
  63         /* Switch back to mass storage mode before closing. */
  64         stlink_run(connected_stlink);
  65         stlink_exit_debug_mode(connected_stlink);
  66         stlink_close(connected_stlink);
  67     }
  68
  69     exit(1);
  70 }
  71 #endif
  72
  73
  74
  75 int parse_options(int argc, char** argv, st_state_t *st) {
  76     static struct option long_options[] = {
  77         {"help", no_argument, NULL, 'h'},
  78         {"verbose", optional_argument, NULL, 'v'},
  79         {"device", required_argument, NULL, 'd'},
  80         {"stlink_version", required_argument, NULL, 's'},
  81         {"stlinkv1", no_argument, NULL, '1'},
  82                 {"listen_port", required_argument, NULL, 'p'},
  83                 {"multi", optional_argument, NULL, 'm'},
  84                 {"no-reset", optional_argument, NULL, 'n'},
  85         {0, 0, 0, 0},
  86     };
  87         const char * help_str = "%s - usage:\n\n"
  88         "  -h, --help\t\tPrint this help\n"
  89         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  90         "  -v, --verbose\tspecify generally verbose logging\n"
  91         "  -d <device>, --device=/dev/stlink2_1\n"
  92         "\t\t\tWhere is your stlink device connected?\n"
  93         "  -s X, --stlink_version=X\n"
  94         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  95         "  -1, --stlinkv1\tForce stlink version 1\n"
  96         "  -p 4242, --listen_port=1234\n"
  97         "\t\t\tSet the gdb server listen port. "
  98         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  99     "  -m, --multi\n"
 100     "\t\t\tSet gdb server to extended mode.\n"
 101     "\t\t\tst-util will continue listening for connections after disconnect.\n"
 102     "  -n, --no-reset\n"
 103     "\t\t\tDo not reset board on connection.\n"
 104         ;
 105
 106
 107     int option_index = 0;
 108     int c;
 109     int q;
 110     while ((c = getopt_long(argc, argv, "hv::d:s:1p:mn", long_options, &option_index)) != -1) {
 111         switch (c) {
 112         case 0:
 113             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 114             printf("option %s", long_options[option_index].name);
 115             if (optarg) {
 116                 printf(" with arg %s", optarg);
 117             }
 118             printf("\n");
 119             break;
 120         case 'h':
 121             printf(help_str, argv[0]);
 122             exit(EXIT_SUCCESS);
 123             break;
 124         case 'v':
 125             if (optarg) {
 126                 st->logging_level = atoi(optarg);
 127             } else {
 128                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 129             }
 130             break;
 131         case 'd':
 132             if (strlen(optarg) > sizeof (st->devicename)) {
 133                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 134             } else {
 135                 strcpy(st->devicename, optarg);
 136             }
 137             break;
 138                 case '1':
 139                         st->stlink_version = 1;
 140                         break;
 141                 case 's':
 142                         sscanf(optarg, "%i", &q);
 143                         if (q < 0 || q > 2) {
 144                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 145                                 exit(EXIT_FAILURE);
 146                         }
 147                         st->stlink_version = q;
 148                         break;
 149                 case 'p':
 150                         sscanf(optarg, "%i", &q);
 151                         if (q < 0) {
 152                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 153                                 exit(EXIT_FAILURE);
 154                         }
 155                         st->listen_port = q;
 156                         break;
 157                 case 'm':
 158                         st->persistent = 1;
 159                         break;
 160                 case 'n':
 161                         st->reset = 0;
 162                         break;
 163         }
 164     }
 165
 166     if (optind < argc) {
 167         printf("non-option ARGV-elements: ");
 168         while (optind < argc)
 169             printf("%s ", argv[optind++]);
 170         printf("\n");
 171     }
 172     return 0;
 173 }
 174
 175
 176 int main(int argc, char** argv) {
 177         uint32_t voltage;
 178
 179         stlink_t *sl = NULL;
 180
 181         st_state_t state;
 182         memset(&state, 0, sizeof(state));
 183         // set defaults...
 184         state.stlink_version = 2;
 185         state.logging_level = DEFAULT_LOGGING_LEVEL;
 186         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 187         state.reset = 1;    /* By default, reset board */
 188         parse_options(argc, argv, &state);
 189         switch (state.stlink_version) {
 190         case 2:
 191                 sl = stlink_open_usb(state.logging_level, 0);
 192                 if(sl == NULL) return 1;
 193                 break;
 194         case 1:
 195                 sl = stlink_v1_open(state.logging_level, 0);
 196                 if(sl == NULL) return 1;
 197                 break;
 198     }
 199
 200     connected_stlink = sl;
 201 #ifndef __MINGW32__
 202     signal(SIGINT, &cleanup);
 203     signal(SIGTERM, &cleanup);
 204 #endif
 205
 206     if (state.reset) {
 207                 stlink_reset(sl);
 208     }
 209
 210         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 211
 212         voltage = stlink_target_voltage(sl);
 213         if (voltage != -1) {
 214                 printf("Target voltage is %d mV.\n", voltage);
 215         }
 216
 217         sl->verbose=0;
 218
 219         current_memory_map = make_memory_map(sl);
 220
 221 #ifdef __MINGW32__
 222         WSADATA wsadata;
 223         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 224                 goto winsock_error;
 225         }
 226 #endif
 227
 228         do {
 229                 serve(sl, &state);
 230
 231                 /* Continue */
 232                 stlink_run(sl);
 233         } while (state.persistent);
 234
 235 #ifdef __MINGW32__
 236 winsock_error:
 237         WSACleanup();
 238 #endif
 239
 240         /* Switch back to mass storage mode before closing. */
 241         stlink_exit_debug_mode(sl);
 242         stlink_close(sl);
 243
 244         return 0;
 245 }
 246
 247 static const char* const target_description_F4 =
 248     "<?xml version=\"1.0\"?>"
 249     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 250     "<target version=\"1.0\">"
 251     "   <architecture>arm</architecture>"
 252     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 253     "       <reg name=\"r0\" bitsize=\"32\"/>"
 254     "       <reg name=\"r1\" bitsize=\"32\"/>"
 255     "       <reg name=\"r2\" bitsize=\"32\"/>"
 256     "       <reg name=\"r3\" bitsize=\"32\"/>"
 257     "       <reg name=\"r4\" bitsize=\"32\"/>"
 258     "       <reg name=\"r5\" bitsize=\"32\"/>"
 259     "       <reg name=\"r6\" bitsize=\"32\"/>"
 260     "       <reg name=\"r7\" bitsize=\"32\"/>"
 261     "       <reg name=\"r8\" bitsize=\"32\"/>"
 262     "       <reg name=\"r9\" bitsize=\"32\"/>"
 263     "       <reg name=\"r10\" bitsize=\"32\"/>"
 264     "       <reg name=\"r11\" bitsize=\"32\"/>"
 265     "       <reg name=\"r12\" bitsize=\"32\"/>"
 266     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 267     "       <reg name=\"lr\" bitsize=\"32\"/>"
 268     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 269     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 270     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 271     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 272     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 273     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 274     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 275     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 276     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 285     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 286     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 287     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 288     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 289     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 290     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 291     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 292     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 293     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 294     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 295     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 296     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 297     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 298     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 299     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 300     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 301     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 302     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 303     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 304     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 305     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 306     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 307     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 308     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 309     "   </feature>"
 310     "</target>";
 311
 312 static const char* const memory_map_template_F4 =
 313   "<?xml version=\"1.0\"?>"
 314   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 315   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 316   "<memory-map>"
 317   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 318   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 319   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 320   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 321   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 322   "  </memory>"
 323   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 324   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 325   "  </memory>"
 326   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 327   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 328   "  </memory>"
 329   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 330   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 331   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 332   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 333   "</memory-map>";
 334
 335 static const char* const memory_map_template =
 336   "<?xml version=\"1.0\"?>"
 337   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 338   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 339   "<memory-map>"
 340   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 341   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 342   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 343   "    <property name=\"blocksize\">0x%zx</property>"
 344   "  </memory>"
 345   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 346   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 347   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 348   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 349   "</memory-map>";
 350
 351 char* make_memory_map(stlink_t *sl) {
 352         /* This will be freed in serve() */
 353         char* map = malloc(4096);
 354         map[0] = '\0';
 355
 356         if(sl->chip_id==STM32_CHIPID_F4) {
 357         strcpy(map, memory_map_template_F4);
 358     } else {
 359         snprintf(map, 4096, memory_map_template,
 360                         sl->flash_size,
 361                         sl->sram_size,
 362                         sl->flash_size, sl->flash_pgsz,
 363                         sl->sys_base, sl->sys_size);
 364     }
 365         return map;
 366 }
 367
 368
 369 /*
 370  * DWT_COMP0     0xE0001020
 371  * DWT_MASK0     0xE0001024
 372  * DWT_FUNCTION0 0xE0001028
 373  * DWT_COMP1     0xE0001030
 374  * DWT_MASK1     0xE0001034
 375  * DWT_FUNCTION1 0xE0001038
 376  * DWT_COMP2     0xE0001040
 377  * DWT_MASK2     0xE0001044
 378  * DWT_FUNCTION2 0xE0001048
 379  * DWT_COMP3     0xE0001050
 380  * DWT_MASK3     0xE0001054
 381  * DWT_FUNCTION3 0xE0001058
 382  */
 383
 384 #define DATA_WATCH_NUM 4
 385
 386 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 387
 388 struct code_hw_watchpoint {
 389         stm32_addr_t addr;
 390         uint8_t mask;
 391         enum watchfun fun;
 392 };
 393
 394 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 395
 396 static void init_data_watchpoints(stlink_t *sl) {
 397         #if DEBUG
 398         printf("init watchpoints\n");
 399         #endif
 400
 401         // set trcena in debug command to turn on dwt unit
 402         stlink_write_debug32(sl, 0xE000EDFC,
 403                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 404
 405         // make sure all watchpoints are cleared
 406         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 407                 data_watches[i].fun = WATCHDISABLED;
 408                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 409         }
 410 }
 411
 412 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 413 {
 414         int i = 0;
 415         uint32_t mask;
 416
 417         // computer mask
 418         // find a free watchpoint
 419         // configure
 420
 421         mask = -1;
 422         i = len;
 423         while(i) {
 424                 i >>= 1;
 425                 mask++;
 426         }
 427
 428         if((mask != (uint32_t)-1) && (mask < 16)) {
 429                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 430                         // is this an empty slot ?
 431                         if(data_watches[i].fun == WATCHDISABLED) {
 432                                 #if DEBUG
 433                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 434                                 #endif
 435
 436                                 data_watches[i].fun = wf;
 437                                 data_watches[i].addr = addr;
 438                                 data_watches[i].mask = mask;
 439
 440                                 // insert comparator address
 441                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 442
 443                                 // insert mask
 444                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 445
 446                                 // insert function
 447                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 448
 449                                 // just to make sure the matched bit is clear !
 450                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 451                                 return 0;
 452                         }
 453                 }
 454         }
 455
 456         #if DEBUG
 457         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 458         #endif
 459         return -1;
 460 }
 461
 462 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 463 {
 464         int i;
 465
 466         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 467                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 468                         #if DEBUG
 469                         printf("delete watchpoint %d addr %x\n", i, addr);
 470                         #endif
 471
 472                         data_watches[i].fun = WATCHDISABLED;
 473                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 474
 475                         return 0;
 476                 }
 477         }
 478
 479         #if DEBUG
 480         printf("failure: delete watchpoint addr %x\n", addr);
 481         #endif
 482
 483         return -1;
 484 }
 485
 486 #define CODE_BREAK_NUM  6
 487 #define CODE_BREAK_LOW  0x01
 488 #define CODE_BREAK_HIGH 0x02
 489
 490 struct code_hw_breakpoint {
 491         stm32_addr_t addr;
 492         int          type;
 493 };
 494
 495 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 496
 497 static void init_code_breakpoints(stlink_t *sl) {
 498         memset(sl->q_buf, 0, 4);
 499         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 500         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 501         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 502
 503         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 504                 code_breaks[i].type = 0;
 505                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 506         }
 507 }
 508
 509 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 510         stm32_addr_t fpb_addr = addr & ~0x3;
 511         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 512
 513         if(addr & 1) {
 514                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 515                 return -1;
 516         }
 517
 518         int id = -1;
 519         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 520                 if(fpb_addr == code_breaks[i].addr ||
 521                         (set && code_breaks[i].type == 0)) {
 522                         id = i;
 523                         break;
 524                 }
 525         }
 526
 527         if(id == -1) {
 528                 if(set) return -1; // Free slot not found
 529                 else    return 0;  // Breakpoint is already removed
 530         }
 531
 532         struct code_hw_breakpoint* brk = &code_breaks[id];
 533
 534         brk->addr = fpb_addr;
 535
 536         if(set) brk->type |= type;
 537         else    brk->type &= ~type;
 538
 539         if(brk->type == 0) {
 540                 #if DEBUG
 541                 printf("clearing hw break %d\n", id);
 542                 #endif
 543
 544                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 545         } else {
 546                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 547
 548                 #if DEBUG
 549                 printf("setting hw break %d at %08x (%d)\n",
 550                         id, brk->addr, brk->type);
 551                 printf("reg %08x \n",
 552                         mask);
 553                 #endif
 554
 555                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 556         }
 557
 558         return 0;
 559 }
 560
 561
 562 struct flash_block {
 563         stm32_addr_t addr;
 564         unsigned     length;
 565         uint8_t*     data;
 566
 567         struct flash_block* next;
 568 };
 569
 570 static struct flash_block* flash_root;
 571
 572 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 573
 574         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 575                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 576                 return -1;
 577         }
 578
 579         stlink_calculate_pagesize(sl, addr);
 580         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 581                 fprintf(stderr, "flash_add_block: unaligned block\n");
 582                 return -1;
 583         }
 584
 585         struct flash_block* new = malloc(sizeof(struct flash_block));
 586         new->next = flash_root;
 587
 588         new->addr   = addr;
 589         new->length = length;
 590         new->data   = calloc(length, 1);
 591
 592         flash_root = new;
 593
 594         return 0;
 595 }
 596
 597 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 598         unsigned int fit_blocks = 0, fit_length = 0;
 599
 600         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 601                 /* Block: ------X------Y--------
 602                  * Data:            a-----b
 603                  *                a--b
 604                  *            a-----------b
 605                  * Block intersects with data, if:
 606                  *  a < Y && b > x
 607                  */
 608
 609                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 610                 unsigned a = addr, b = addr + length;
 611                 if(a < Y && b > X) {
 612                         // from start of the block
 613                         unsigned start = (a > X ? a : X) - X;
 614                         unsigned end   = (b > Y ? Y : b) - X;
 615
 616                         memcpy(fb->data + start, data, end - start);
 617
 618                         fit_blocks++;
 619                         fit_length += end - start;
 620                 }
 621         }
 622
 623         if(fit_blocks == 0) {
 624                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 625                 return -1;
 626         }
 627
 628         if(fit_length != length) {
 629                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 630                         addr, length, fit_length);
 631                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 632         }
 633
 634         return 0;
 635 }
 636
 637 static int flash_go(stlink_t *sl) {
 638         int error = -1;
 639
 640         // Some kinds of clock settings do not allow writing to flash.
 641         stlink_reset(sl);
 642
 643         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 644                 #if DEBUG
 645                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 646                 #endif
 647
 648                 unsigned length = fb->length;
 649                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 650
 651                         //Update FLASH_PAGE
 652                         stlink_calculate_pagesize(sl, page);
 653
 654                         #if DEBUG
 655                         printf("flash_do: page %08x\n", page);
 656                         #endif
 657
 658                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 659                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 660                                 goto error;
 661                         }
 662         }
 663
 664         stlink_reset(sl);
 665
 666         error = 0;
 667
 668 error:
 669         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 670                 next = fb->next;
 671                 free(fb->data);
 672                 free(fb);
 673         }
 674
 675         flash_root = NULL;
 676
 677         return error;
 678 }
 679
 680 int serve(stlink_t *sl, st_state_t *st) {
 681         int sock = socket(AF_INET, SOCK_STREAM, 0);
 682         if(sock < 0) {
 683                 perror("socket");
 684                 return 1;
 685         }
 686
 687         unsigned int val = 1;
 688         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 689
 690         struct sockaddr_in serv_addr;
 691         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 692         serv_addr.sin_family = AF_INET;
 693         serv_addr.sin_addr.s_addr = INADDR_ANY;
 694         serv_addr.sin_port = htons(st->listen_port);
 695
 696         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 697                 perror("bind");
 698                 return 1;
 699         }
 700
 701         if(listen(sock, 5) < 0) {
 702                 perror("listen");
 703                 return 1;
 704         }
 705
 706         printf("Listening at *:%d...\n", st->listen_port);
 707
 708         int client = accept(sock, NULL, NULL);
 709         //signal (SIGINT, SIG_DFL);
 710         if(client < 0) {
 711                 perror("accept");
 712                 return 1;
 713         }
 714
 715         close(sock);
 716
 717         stlink_force_debug(sl);
 718         if (st->reset) {
 719                 stlink_reset(sl);
 720     }
 721         init_code_breakpoints(sl);
 722         init_data_watchpoints(sl);
 723
 724         printf("GDB connected.\n");
 725
 726         /*
 727          * To allow resetting the chip from GDB it is required to
 728          * emulate attaching and detaching to target.
 729          */
 730         unsigned int attached = 1;
 731
 732         while(1) {
 733                 char* packet;
 734
 735                 int status = gdb_recv_packet(client, &packet);
 736                 if(status < 0) {
 737                         fprintf(stderr, "cannot recv: %d\n", status);
 738                         return 1;
 739                 }
 740
 741                 #if DEBUG
 742                 printf("recv: %s\n", packet);
 743                 #endif
 744
 745                 char* reply = NULL;
 746                 reg regp;
 747
 748                 switch(packet[0]) {
 749                 case 'q': {
 750                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 751                                 reply = strdup("");
 752                                 break;
 753                         }
 754
 755                         char *separator = strstr(packet, ":"), *params = "";
 756                         if(separator == NULL) {
 757                                 separator = packet + strlen(packet);
 758                         } else {
 759                                 params = separator + 1;
 760                         }
 761
 762                         unsigned queryNameLength = (separator - &packet[1]);
 763                         char* queryName = calloc(queryNameLength + 1, 1);
 764                         strncpy(queryName, &packet[1], queryNameLength);
 765
 766                         #if DEBUG
 767                         printf("query: %s;%s\n", queryName, params);
 768                         #endif
 769
 770                         if(!strcmp(queryName, "Supported")) {
 771                 if(sl->chip_id==STM32_CHIPID_F4) {
 772                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 773                 }
 774                 else {
 775                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 776                 }
 777                         } else if(!strcmp(queryName, "Xfer")) {
 778                                 char *type, *op, *__s_addr, *s_length;
 779                                 char *tok = params;
 780                                 char *annex __attribute__((unused));
 781
 782                                 type     = strsep(&tok, ":");
 783                                 op       = strsep(&tok, ":");
 784                                 annex    = strsep(&tok, ":");
 785                                 __s_addr   = strsep(&tok, ",");
 786                                 s_length = tok;
 787
 788                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 789                                        length = strtoul(s_length, NULL, 16);
 790
 791                                 #if DEBUG
 792                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 793                                         type, op, annex, addr, length);
 794                                 #endif
 795
 796                                 const char* data = NULL;
 797
 798                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 799                                         data = current_memory_map;
 800
 801                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 802                                         data = target_description_F4;
 803
 804                                 if(data) {
 805                                         unsigned data_length = strlen(data);
 806                                         if(addr + length > data_length)
 807                                                 length = data_length - addr;
 808
 809                                         if(length == 0) {
 810                                                 reply = strdup("l");
 811                                         } else {
 812                                                 reply = calloc(length + 2, 1);
 813                                                 reply[0] = 'm';
 814                                                 strncpy(&reply[1], data, length);
 815                                         }
 816                                 }
 817                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 818                                 // Rcmd uses the wrong separator
 819                                 char *separator = strstr(packet, ","), *params = "";
 820                                 if(separator == NULL) {
 821                                         separator = packet + strlen(packet);
 822                                 } else {
 823                                         params = separator + 1;
 824                                 }
 825
 826
 827                                 if (!strncmp(params,"726573756d65",12)) {// resume
 828 #if DEBUG
 829                                         printf("Rcmd: resume\n");
 830 #endif
 831                                         stlink_run(sl);
 832
 833                                         reply = strdup("OK");
 834                 } else if (!strncmp(params,"68616c74",8)) { //halt
 835                                         reply = strdup("OK");
 836
 837                                         stlink_force_debug(sl);
 838
 839 #if DEBUG
 840                                         printf("Rcmd: halt\n");
 841 #endif
 842                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 843                                         reply = strdup("OK");
 844
 845                                         stlink_jtag_reset(sl, 1);
 846                                         stlink_jtag_reset(sl, 0);
 847                                         stlink_force_debug(sl);
 848
 849 #if DEBUG
 850                                         printf("Rcmd: jtag_reset\n");
 851 #endif
 852                 } else if (!strncmp(params,"7265736574",10)) { //reset
 853                                         reply = strdup("OK");
 854
 855                                         stlink_force_debug(sl);
 856                                         stlink_reset(sl);
 857                                         init_code_breakpoints(sl);
 858                                         init_data_watchpoints(sl);
 859
 860 #if DEBUG
 861                                         printf("Rcmd: reset\n");
 862 #endif
 863                                 } else {
 864 #if DEBUG
 865                                         printf("Rcmd: %s\n", params);
 866 #endif
 867
 868                                 }
 869
 870                         }
 871
 872                         if(reply == NULL)
 873                                 reply = strdup("");
 874
 875                         free(queryName);
 876
 877                         break;
 878                 }
 879
 880                 case 'v': {
 881                         char *params = NULL;
 882                         char *cmdName = strtok_r(packet, ":;", &params);
 883
 884                         cmdName++; // vCommand -> Command
 885
 886                         if(!strcmp(cmdName, "FlashErase")) {
 887                                 char *__s_addr, *s_length;
 888                                 char *tok = params;
 889
 890                                 __s_addr   = strsep(&tok, ",");
 891                                 s_length = tok;
 892
 893                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 894                                        length = strtoul(s_length, NULL, 16);
 895
 896                                 #if DEBUG
 897                                 printf("FlashErase: addr:%08x,len:%04x\n",
 898                                         addr, length);
 899                                 #endif
 900
 901                                 if(flash_add_block(addr, length, sl) < 0) {
 902                                         reply = strdup("E00");
 903                                 } else {
 904                                         reply = strdup("OK");
 905                                 }
 906                         } else if(!strcmp(cmdName, "FlashWrite")) {
 907                                 char *__s_addr, *data;
 908                                 char *tok = params;
 909
 910                                 __s_addr = strsep(&tok, ":");
 911                                 data   = tok;
 912
 913                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 914                                 unsigned data_length = status - (data - packet);
 915
 916                                 // Length of decoded data cannot be more than
 917                                 // encoded, as escapes are removed.
 918                                 // Additional byte is reserved for alignment fix.
 919                                 uint8_t *decoded = calloc(data_length + 1, 1);
 920                                 unsigned dec_index = 0;
 921                                 for(unsigned int i = 0; i < data_length; i++) {
 922                                         if(data[i] == 0x7d) {
 923                                                 i++;
 924                                                 decoded[dec_index++] = data[i] ^ 0x20;
 925                                         } else {
 926                                                 decoded[dec_index++] = data[i];
 927                                         }
 928                                 }
 929
 930                                 // Fix alignment
 931                                 if(dec_index % 2 != 0)
 932                                         dec_index++;
 933
 934                                 #if DEBUG
 935                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 936                                 #endif
 937
 938                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 939                                         reply = strdup("E00");
 940                                 } else {
 941                                         reply = strdup("OK");
 942                                 }
 943                         } else if(!strcmp(cmdName, "FlashDone")) {
 944                                 if(flash_go(sl) < 0) {
 945                                         reply = strdup("E00");
 946                                 } else {
 947                                         reply = strdup("OK");
 948                                 }
 949                         } else if(!strcmp(cmdName, "Kill")) {
 950                                 attached = 0;
 951
 952                                 reply = strdup("OK");
 953                         }
 954
 955                         if(reply == NULL)
 956                                 reply = strdup("");
 957
 958                         break;
 959                 }
 960
 961                 case 'c':
 962                         stlink_run(sl);
 963
 964                         while(1) {
 965                                 int status = gdb_check_for_interrupt(client);
 966                                 if(status < 0) {
 967                                         fprintf(stderr, "cannot check for int: %d\n", status);
 968                                         return 1;
 969                                 }
 970
 971                                 if(status == 1) {
 972                                         stlink_force_debug(sl);
 973                                         break;
 974                                 }
 975
 976                                 stlink_status(sl);
 977                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 978                                         break;
 979                                 }
 980
 981                                 usleep(100000);
 982                         }
 983
 984                         reply = strdup("S05"); // TRAP
 985                         break;
 986
 987                 case 's':
 988                         stlink_step(sl);
 989
 990                         reply = strdup("S05"); // TRAP
 991                         break;
 992
 993                 case '?':
 994                         if(attached) {
 995                                 reply = strdup("S05"); // TRAP
 996                         } else {
 997                                 /* Stub shall reply OK if not attached. */
 998                                 reply = strdup("OK");
 999                         }
1000                         break;
1001
1002                 case 'g':
1003                         stlink_read_all_regs(sl, &regp);
1004
1005                         reply = calloc(8 * 16 + 1, 1);
1006                         for(int i = 0; i < 16; i++)
1007                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
1008
1009                         break;
1010
1011                 case 'p': {
1012                         unsigned id = strtoul(&packet[1], NULL, 16);
1013                         unsigned myreg = 0xDEADDEAD;
1014
1015                         if(id < 16) {
1016                                 stlink_read_reg(sl, id, &regp);
1017                                 myreg = htonl(regp.r[id]);
1018                         } else if(id == 0x19) {
1019                                 stlink_read_reg(sl, 16, &regp);
1020                                 myreg = htonl(regp.xpsr);
1021                         } else if(id == 0x1A) {
1022                                 stlink_read_reg(sl, 17, &regp);
1023                                 myreg = htonl(regp.main_sp);
1024                         } else if(id == 0x1B) {
1025                                 stlink_read_reg(sl, 18, &regp);
1026                                 myreg = htonl(regp.process_sp);
1027                         } else if(id == 0x1C) {
1028                                 stlink_read_unsupported_reg(sl, id, &regp);
1029                                 myreg = htonl(regp.control);
1030                         } else if(id == 0x1D) {
1031                                 stlink_read_unsupported_reg(sl, id, &regp);
1032                                 myreg = htonl(regp.faultmask);
1033                         } else if(id == 0x1E) {
1034                                 stlink_read_unsupported_reg(sl, id, &regp);
1035                                 myreg = htonl(regp.basepri);
1036                         } else if(id == 0x1F) {
1037                                 stlink_read_unsupported_reg(sl, id, &regp);
1038                                 myreg = htonl(regp.primask);
1039             } else if(id >= 0x20 && id < 0x40) {
1040                 stlink_read_unsupported_reg(sl, id, &regp);
1041                 myreg = htonl(regp.s[id-0x20]);
1042                         } else if(id == 0x40) {
1043                 stlink_read_unsupported_reg(sl, id, &regp);
1044                 myreg = htonl(regp.fpscr);
1045                         } else {
1046                                 reply = strdup("E00");
1047                         }
1048
1049                         reply = calloc(8 + 1, 1);
1050                         sprintf(reply, "%08x", myreg);
1051
1052                         break;
1053                 }
1054
1055                 case 'P': {
1056                         char* s_reg = &packet[1];
1057                         char* s_value = strstr(&packet[1], "=") + 1;
1058
1059                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1060                         unsigned value = strtoul(s_value, NULL, 16);
1061
1062                         if(reg < 16) {
1063                                 stlink_write_reg(sl, ntohl(value), reg);
1064                         } else if(reg == 0x19) {
1065                                 stlink_write_reg(sl, ntohl(value), 16);
1066                         } else if(reg == 0x1A) {
1067                                 stlink_write_reg(sl, ntohl(value), 17);
1068                         } else if(reg == 0x1B) {
1069                                 stlink_write_reg(sl, ntohl(value), 18);
1070                         } else if(reg == 0x1C) {
1071                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1072                         } else if(reg == 0x1D) {
1073                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1074                         } else if(reg == 0x1E) {
1075                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1076                         } else if(reg == 0x1F) {
1077                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1078             } else if(reg >= 0x20 && reg < 0x40) {
1079                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1080                         } else if(reg == 0x40) {
1081                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1082                         } else {
1083                                 reply = strdup("E00");
1084                         }
1085
1086                         if(!reply) {
1087                                 reply = strdup("OK");
1088                         }
1089
1090                         break;
1091                 }
1092
1093                 case 'G':
1094                         for(int i = 0; i < 16; i++) {
1095                                 char str[9] = {0};
1096                                 strncpy(str, &packet[1 + i * 8], 8);
1097                                 uint32_t reg = strtoul(str, NULL, 16);
1098                                 stlink_write_reg(sl, ntohl(reg), i);
1099                         }
1100
1101                         reply = strdup("OK");
1102                         break;
1103
1104                 case 'm': {
1105                         char* s_start = &packet[1];
1106                         char* s_count = strstr(&packet[1], ",") + 1;
1107
1108                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1109                         unsigned     count = strtoul(s_count, NULL, 16);
1110
1111                         unsigned adj_start = start % 4;
1112                         unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1113
1114                         stlink_read_mem32(sl, start - adj_start, count_rnd);
1115
1116                         reply = calloc(count * 2 + 1, 1);
1117                         for(unsigned int i = 0; i < count; i++) {
1118                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1119                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1120                         }
1121
1122                         break;
1123                 }
1124
1125                 case 'M': {
1126                         char* s_start = &packet[1];
1127                         char* s_count = strstr(&packet[1], ",") + 1;
1128                         char* hexdata = strstr(packet, ":") + 1;
1129
1130                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1131                         unsigned     count = strtoul(s_count, NULL, 16);
1132
1133                         if(start % 4) {
1134                           unsigned align_count = 4 - start % 4;
1135                           if (align_count > count) align_count = count;
1136                           for(unsigned int i = 0; i < align_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, align_count);
1142                           start += align_count;
1143                           count -= align_count;
1144                           hexdata += 2*align_count;
1145                         }
1146
1147                         if(count - count % 4) {
1148                           unsigned aligned_count = count - count % 4;
1149
1150                           for(unsigned int i = 0; i < aligned_count; i ++) {
1151                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1152                             uint8_t byte = strtoul(hex, NULL, 16);
1153                             sl->q_buf[i] = byte;
1154                           }
1155                           stlink_write_mem32(sl, start, aligned_count);
1156                           count -= aligned_count;
1157                           start += aligned_count;
1158                           hexdata += 2*aligned_count;
1159                         }
1160
1161                         if(count) {
1162                           for(unsigned int i = 0; i < count; i ++) {
1163                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1164                             uint8_t byte = strtoul(hex, NULL, 16);
1165                             sl->q_buf[i] = byte;
1166                           }
1167                           stlink_write_mem8(sl, start, count);
1168                         }
1169                         reply = strdup("OK");
1170                         break;
1171                 }
1172
1173                 case 'Z': {
1174                         char *endptr;
1175                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1176                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1177
1178                         switch (packet[1]) {
1179                                 case '1':
1180                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1181                                         reply = strdup("E00");
1182                                 } else {
1183                                         reply = strdup("OK");
1184                                 }
1185                                 break;
1186
1187                                 case '2':   // insert write watchpoint
1188                                 case '3':   // insert read  watchpoint
1189                                 case '4':   // insert access watchpoint
1190                                 {
1191                                         enum watchfun wf;
1192                                         if(packet[1] == '2') {
1193                                                 wf = WATCHWRITE;
1194                                         } else if(packet[1] == '3') {
1195                                                 wf = WATCHREAD;
1196                                         } else {
1197                                                 wf = WATCHACCESS;
1198                                         }
1199
1200                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1201                         reply = strdup("E00");
1202                     } else {
1203                         reply = strdup("OK");
1204                         break;
1205                     }
1206                                 }
1207
1208                                 default:
1209                                 reply = strdup("");
1210                         }
1211                         break;
1212                 }
1213                 case 'z': {
1214                         char *endptr;
1215                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1216                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1217
1218                         switch (packet[1]) {
1219                                 case '1': // remove breakpoint
1220                                 update_code_breakpoint(sl, addr, 0);
1221                                 reply = strdup("OK");
1222                                 break;
1223
1224                                 case '2' : // remove write watchpoint
1225                                 case '3' : // remove read watchpoint
1226                                 case '4' : // remove access watchpoint
1227                                 if(delete_data_watchpoint(sl, addr) < 0) {
1228                                         reply = strdup("E00");
1229                                 } else {
1230                                         reply = strdup("OK");
1231                                         break;
1232                                 }
1233
1234                                 default:
1235                                 reply = strdup("");
1236                         }
1237                         break;
1238                 }
1239
1240                 case '!': {
1241                         /*
1242                          * Enter extended mode which allows restarting.
1243                          * We do support that always.
1244                          */
1245
1246                         /*
1247                          * Also, set to persistent mode
1248                          * to allow GDB disconnect.
1249                          */
1250                         st->persistent = 1;
1251
1252                         reply = strdup("OK");
1253
1254                         break;
1255                 }
1256
1257                 case 'R': {
1258                         /* Reset the core. */
1259
1260                         stlink_reset(sl);
1261                         init_code_breakpoints(sl);
1262                         init_data_watchpoints(sl);
1263
1264                         attached = 1;
1265
1266                         reply = strdup("OK");
1267
1268                         break;
1269                 }
1270
1271                 default:
1272                         reply = strdup("");
1273                 }
1274
1275                 if(reply) {
1276                         #if DEBUG
1277                         printf("send: %s\n", reply);
1278                         #endif
1279
1280                         int result = gdb_send_packet(client, reply);
1281                         if(result != 0) {
1282                                 fprintf(stderr, "cannot send: %d\n", result);
1283                                 free(reply);
1284                                 free(packet);
1285                                 return 1;
1286                         }
1287
1288                         free(reply);
1289                 }
1290
1291                 free(packet);
1292         }
1293
1294         return 0;
1295 }