git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

   1 /* -*- tab-width:8 -*- */
   2
   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 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <signal.h>
  19
  20 #include <stlink-common.h>
  21
  22 #include "gdb-remote.h"
  23
  24 #define DEFAULT_LOGGING_LEVEL 100
  25 #define DEFAULT_GDB_LISTEN_PORT 4242
  26
  27 #define STRINGIFY_inner(name) #name
  28 #define STRINGIFY(name) STRINGIFY_inner(name)
  29
  30 #define FLASH_BASE 0x08000000
  31 #define FLASH_PAGE (sl->flash_pgsz)
  32 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  33 #define FLASH_SIZE (FLASH_PAGE * 128)
  34
  35 static const char hex[] = "0123456789abcdef";
  36
  37 static const char* current_memory_map = NULL;
  38
  39 /*
  40  * Chip IDs are explained in the appropriate programming manual for the
  41  * DBGMCU_IDCODE register (0xE0042000)
  42  */
  43
  44 #define CORE_M3_R1 0x1BA00477
  45 #define CORE_M3_R2 0x4BA00477
  46 #define CORE_M4_R0 0x2BA01477
  47
  48 struct chip_params {
  49         uint32_t chip_id;
  50         char* description;
  51         uint32_t flash_size_reg;
  52         uint32_t max_flash_size, flash_pagesize;
  53         uint32_t sram_size;
  54         uint32_t bootrom_base, bootrom_size;
  55 } const devices[] = {
  56         { 0x410, "F1 Medium-density device", 0x1ffff7e0,
  57           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  }, // table 2, pm0063
  58         { 0x411, "F2 device", 0, /* No flash size register found in the docs*/
  59           0x100000,   0x20000, 0x20000, 0x1fff0000, 0x7800  }, // table 1, pm0059
  60         { 0x412, "F1 Low-density device", 0x1ffff7e0,
  61           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  }, // table 1, pm0063
  62         { 0x413, "F4 device", 0x1FFF7A10,
  63           0x100000,   0x20000, 0x30000,  0x1fff0000, 0x7800  }, // table 1, pm0081
  64         { 0x414, "F1 High-density device", 0x1ffff7e0,
  65           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },  // table 3 pm0063
  66           // This ignores the EEPROM! (and uses the page erase size,
  67           // not the sector write protection...)
  68         { 0x416, "L1 Med-density device", 0x1FF8004C, // table 1, pm0062
  69           0x20000, 0x100, 0x4000, 0x1ff00000, 0x1000 },
  70         { 0x418, "F1 Connectivity line device", 0x1ffff7e0,
  71           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  72         { 0x420, "F1 Medium-density value line device", 0x1ffff7e0,
  73           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  74         { 0x428, "F1 High-density value line device", 0x1ffff7e0,
  75           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  76         { 0x430, "F1 XL-density device", 0x1ffff7e0,  // pm0068
  77           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  78         { 0 }
  79 };
  80
  81 typedef struct _st_state_t {
  82     // things from command line, bleh
  83     int stlink_version;
  84     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  85     char devicename[100];
  86     int logging_level;
  87         int listen_port;
  88 } st_state_t;
  89
  90
  91 int serve(stlink_t *sl, int port);
  92 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  93
  94
  95 int parse_options(int argc, char** argv, st_state_t *st) {
  96     static struct option long_options[] = {
  97         {"help", no_argument, NULL, 'h'},
  98         {"verbose", optional_argument, NULL, 'v'},
  99         {"device", required_argument, NULL, 'd'},
 100         {"stlink_version", required_argument, NULL, 's'},
 101         {"stlinkv1", no_argument, NULL, '1'},
 102                 {"listen_port", required_argument, NULL, 'p'},
 103         {0, 0, 0, 0},
 104     };
 105         const char * help_str = "%s - usage:\n\n"
 106         "  -h, --help\t\tPrint this help\n"
 107         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
 108         "  -v, --verbose\tspecify generally verbose logging\n"
 109         "  -d <device>, --device=/dev/stlink2_1\n"
 110         "\t\t\tWhere is your stlink device connected?\n"
 111         "  -s X, --stlink_version=X\n"
 112         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
 113         "  -1, --stlinkv1\tForce stlink version 1\n"
 114         "  -p 4242, --listen_port=1234\n"
 115         "\t\t\tSet the gdb server listen port. "
 116         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
 117         ;
 118
 119
 120     int option_index = 0;
 121     int c;
 122     int q;
 123     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
 124         switch (c) {
 125         case 0:
 126             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 127             printf("option %s", long_options[option_index].name);
 128             if (optarg) {
 129                 printf(" with arg %s", optarg);
 130             }
 131             printf("\n");
 132             break;
 133         case 'h':
 134             printf(help_str, argv[0]);
 135             exit(EXIT_SUCCESS);
 136             break;
 137         case 'v':
 138             if (optarg) {
 139                 st->logging_level = atoi(optarg);
 140             } else {
 141                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 142             }
 143             break;
 144         case 'd':
 145             if (strlen(optarg) > sizeof (st->devicename)) {
 146                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 147             } else {
 148                 strcpy(st->devicename, optarg);
 149             }
 150             break;
 151                 case '1':
 152                         st->stlink_version = 1;
 153                         break;
 154                 case 's':
 155                         sscanf(optarg, "%i", &q);
 156                         if (q < 0 || q > 2) {
 157                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 158                                 exit(EXIT_FAILURE);
 159                         }
 160                         st->stlink_version = q;
 161                         break;
 162                 case 'p':
 163                         sscanf(optarg, "%i", &q);
 164                         if (q < 0) {
 165                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 166                                 exit(EXIT_FAILURE);
 167                         }
 168                         st->listen_port = q;
 169                         break;
 170         }
 171     }
 172
 173     if (optind < argc) {
 174         printf("non-option ARGV-elements: ");
 175         while (optind < argc)
 176             printf("%s ", argv[optind++]);
 177         printf("\n");
 178     }
 179     return 0;
 180 }
 181
 182
 183 int main(int argc, char** argv) {
 184
 185         stlink_t *sl = NULL;
 186
 187         st_state_t state;
 188         memset(&state, 0, sizeof(state));
 189         // set defaults...
 190         state.stlink_version = 2;
 191         state.logging_level = DEFAULT_LOGGING_LEVEL;
 192         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 193         parse_options(argc, argv, &state);
 194         switch (state.stlink_version) {
 195         case 2:
 196                 sl = stlink_open_usb(state.logging_level);
 197                 if(sl == NULL) return 1;
 198                 break;
 199         case 1:
 200                 sl = stlink_v1_open(state.logging_level);
 201                 if(sl == NULL) return 1;
 202                 break;
 203     }
 204
 205     if (stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE) {
 206         if (stlink_current_mode(sl) == STLINK_DEV_DFU_MODE) {
 207             stlink_exit_dfu_mode(sl);
 208         }
 209         stlink_enter_swd_mode(sl);
 210     }
 211
 212         uint32_t chip_id = stlink_chip_id(sl);
 213         uint32_t core_id = stlink_core_id(sl);
 214
 215         /* Fix chip_id for F4 */
 216         if (((chip_id & 0xFFF) == 0x411) && (core_id == CORE_M4_R0)) {
 217           printf("Fixing wrong chip_id for STM32F4 Rev A errata\n");
 218           chip_id = 0x413;
 219         }
 220
 221         printf("Chip ID is %08x, Core ID is  %08x.\n", chip_id, core_id);
 222
 223         const struct chip_params* params = NULL;
 224
 225         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
 226                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
 227                         params = &devices[i];
 228                         break;
 229                 }
 230         }
 231
 232         if(params == NULL) {
 233                 fprintf(stderr, "Cannot recognize the connected device!\n");
 234                 return 0;
 235         }
 236
 237         printf("Device connected: %s\n", params->description);
 238         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 239                 params->sram_size, params->max_flash_size, params->flash_pagesize);
 240
 241         FLASH_PAGE = params->flash_pagesize;
 242
 243         uint32_t flash_size;
 244
 245         stlink_read_mem32(sl, params->flash_size_reg, 4);
 246         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 247
 248         printf("Flash size is %d KiB.\n", flash_size);
 249         // memory map is in 1k blocks.
 250         current_memory_map = make_memory_map(params, flash_size * 0x400);
 251
 252         while(serve(sl, state.listen_port) == 0);
 253
 254         /* Switch back to mass storage mode before closing. */
 255         stlink_run(sl);
 256         stlink_exit_debug_mode(sl);
 257         stlink_close(sl);
 258
 259         return 0;
 260 }
 261
 262 static const char* const memory_map_template =
 263   "<?xml version=\"1.0\"?>"
 264   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 265   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 266   "<memory-map>"
 267   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 268   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 269   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 270   "    <property name=\"blocksize\">0x%x</property>"
 271   "  </memory>"
 272   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 273   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 274   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 275   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 276   "</memory-map>";
 277
 278 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 279         /* This will be freed in serve() */
 280         char* map = malloc(4096);
 281         map[0] = '\0';
 282
 283         snprintf(map, 4096, memory_map_template,
 284                         flash_size,
 285                         params->sram_size,
 286                         flash_size, params->flash_pagesize,
 287                         params->bootrom_base, params->bootrom_size);
 288
 289         return map;
 290 }
 291
 292
 293 /*
 294  * DWT_COMP0     0xE0001020
 295  * DWT_MASK0     0xE0001024
 296  * DWT_FUNCTION0 0xE0001028
 297  * DWT_COMP1     0xE0001030
 298  * DWT_MASK1     0xE0001034
 299  * DWT_FUNCTION1 0xE0001038
 300  * DWT_COMP2     0xE0001040
 301  * DWT_MASK2     0xE0001044
 302  * DWT_FUNCTION2 0xE0001048
 303  * DWT_COMP3     0xE0001050
 304  * DWT_MASK3     0xE0001054
 305  * DWT_FUNCTION3 0xE0001058
 306  */
 307
 308 #define DATA_WATCH_NUM 4
 309
 310 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 311
 312 struct code_hw_watchpoint {
 313         stm32_addr_t addr;
 314         uint8_t mask;
 315         enum watchfun fun;
 316 };
 317
 318 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 319
 320 static void init_data_watchpoints(stlink_t *sl) {
 321         #ifdef DEBUG
 322         printf("init watchpoints\n");
 323         #endif
 324
 325         // set trcena in debug command to turn on dwt unit
 326         stlink_read_mem32(sl, 0xE000EDFC, 4);
 327         sl->q_buf[3] |= 1;
 328         stlink_write_mem32(sl, 0xE000EDFC, 4);
 329
 330         // make sure all watchpoints are cleared
 331         memset(sl->q_buf, 0, 4);
 332         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 333                 data_watches[i].fun = WATCHDISABLED;
 334                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 335         }
 336 }
 337
 338 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 339 {
 340         int i = 0;
 341         uint32_t mask;
 342
 343         // computer mask
 344         // find a free watchpoint
 345         // configure
 346
 347         mask = -1;
 348         i = len;
 349         while(i) {
 350                 i >>= 1;
 351                 mask++;
 352         }
 353
 354         if((mask != -1) && (mask < 16)) {
 355                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 356                         // is this an empty slot ?
 357                         if(data_watches[i].fun == WATCHDISABLED) {
 358                                 #ifdef DEBUG
 359                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 360                                 #endif
 361
 362                                 data_watches[i].fun = wf;
 363                                 data_watches[i].addr = addr;
 364                                 data_watches[i].mask = mask;
 365
 366                                 // insert comparator address
 367                                 sl->q_buf[0] = (addr & 0xff);
 368                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 369                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 370                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 371
 372                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 373
 374                                 // insert mask
 375                                 memset(sl->q_buf, 0, 4);
 376                                 sl->q_buf[0] = mask;
 377                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 378
 379                                 // insert function
 380                                 memset(sl->q_buf, 0, 4);
 381                                 sl->q_buf[0] = wf;
 382                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 383
 384                                 // just to make sure the matched bit is clear !
 385                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 386                                 return 0;
 387                         }
 388                 }
 389         }
 390
 391         #ifdef DEBUG
 392         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 393         #endif
 394         return -1;
 395 }
 396
 397 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 398 {
 399         int i;
 400
 401         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 402                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 403                         #ifdef DEBUG
 404                         printf("delete watchpoint %d addr %x\n", i, addr);
 405                         #endif
 406
 407                         memset(sl->q_buf, 0, 4);
 408                         data_watches[i].fun = WATCHDISABLED;
 409                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 410
 411                         return 0;
 412                 }
 413         }
 414
 415         #ifdef DEBUG
 416         printf("failure: delete watchpoint addr %x\n", addr);
 417         #endif
 418
 419         return -1;
 420 }
 421
 422 #define CODE_BREAK_NUM  6
 423 #define CODE_BREAK_LOW  0x01
 424 #define CODE_BREAK_HIGH 0x02
 425
 426 struct code_hw_breakpoint {
 427         stm32_addr_t addr;
 428         int          type;
 429 };
 430
 431 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 432
 433 static void init_code_breakpoints(stlink_t *sl) {
 434         memset(sl->q_buf, 0, 4);
 435         sl->q_buf[0] = 0x03; // KEY | ENABLE
 436         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 437         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 438         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 439
 440         memset(sl->q_buf, 0, 4);
 441         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 442                 code_breaks[i].type = 0;
 443                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 444         }
 445 }
 446
 447 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 448         stm32_addr_t fpb_addr = addr & ~0x3;
 449         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 450
 451         if(addr & 1) {
 452                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 453                 return -1;
 454         }
 455
 456         int id = -1;
 457         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 458                 if(fpb_addr == code_breaks[i].addr ||
 459                         (set && code_breaks[i].type == 0)) {
 460                         id = i;
 461                         break;
 462                 }
 463         }
 464
 465         if(id == -1) {
 466                 if(set) return -1; // Free slot not found
 467                 else    return 0;  // Breakpoint is already removed
 468         }
 469
 470         struct code_hw_breakpoint* brk = &code_breaks[id];
 471
 472         brk->addr = fpb_addr;
 473
 474         if(set) brk->type |= type;
 475         else    brk->type &= ~type;
 476
 477         memset(sl->q_buf, 0, 4);
 478
 479         if(brk->type == 0) {
 480                 #ifdef DEBUG
 481                 printf("clearing hw break %d\n", id);
 482                 #endif
 483
 484                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 485         } else {
 486                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 487                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 488                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 489                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 490
 491                 #ifdef DEBUG
 492                 printf("setting hw break %d at %08x (%d)\n",
 493                         id, brk->addr, brk->type);
 494                 printf("reg %02x %02x %02x %02x\n",
 495                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 496                 #endif
 497
 498                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 499         }
 500
 501         return 0;
 502 }
 503
 504
 505 struct flash_block {
 506         stm32_addr_t addr;
 507         unsigned     length;
 508         uint8_t*     data;
 509
 510         struct flash_block* next;
 511 };
 512
 513 static struct flash_block* flash_root;
 514
 515 static int flash_add_block(stm32_addr_t addr, unsigned length,
 516                            stlink_t *sl) {
 517         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 518                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 519                 return -1;
 520         }
 521
 522         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 523                 fprintf(stderr, "flash_add_block: unaligned block\n");
 524                 return -1;
 525         }
 526
 527         struct flash_block* new = malloc(sizeof(struct flash_block));
 528         new->next = flash_root;
 529
 530         new->addr   = addr;
 531         new->length = length;
 532         new->data   = calloc(length, 1);
 533
 534         flash_root = new;
 535
 536         return 0;
 537 }
 538
 539 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 540         int fit_blocks = 0, fit_length = 0;
 541
 542         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 543                 /* Block: ------X------Y--------
 544                  * Data:            a-----b
 545                  *                a--b
 546                  *            a-----------b
 547                  * Block intersects with data, if:
 548                  *  a < Y && b > x
 549                  */
 550
 551                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 552                 unsigned a = addr, b = addr + length;
 553                 if(a < Y && b > X) {
 554                         // from start of the block
 555                         unsigned start = (a > X ? a : X) - X;
 556                         unsigned end   = (b > Y ? Y : b) - X;
 557
 558                         memcpy(fb->data + start, data, end - start);
 559
 560                         fit_blocks++;
 561                         fit_length += end - start;
 562                 }
 563         }
 564
 565         if(fit_blocks == 0) {
 566                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 567                 return -1;
 568         }
 569
 570         if(fit_length != length) {
 571                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 572                         addr, length, fit_length);
 573                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 574         }
 575
 576         return 0;
 577 }
 578
 579 static int flash_go(stlink_t *sl) {
 580         int error = -1;
 581
 582         // Some kinds of clock settings do not allow writing to flash.
 583         stlink_reset(sl);
 584
 585         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 586                 #ifdef DEBUG
 587                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 588                 #endif
 589
 590                 unsigned length = fb->length;
 591                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 592                         #ifdef DEBUG
 593                         printf("flash_do: page %08x\n", page);
 594                         #endif
 595
 596                         stlink_erase_flash_page(sl, page);
 597
 598                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 599                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 600                                 goto error;
 601                 }
 602
 603         }
 604
 605         stlink_reset(sl);
 606
 607         error = 0;
 608
 609 error:
 610         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 611                 next = fb->next;
 612                 free(fb->data);
 613                 free(fb);
 614         }
 615
 616         flash_root = NULL;
 617
 618         return error;
 619 }
 620
 621 int serve(stlink_t *sl, int port) {
 622         int sock = socket(AF_INET, SOCK_STREAM, 0);
 623         if(sock < 0) {
 624                 perror("socket");
 625                 return 1;
 626         }
 627
 628         unsigned int val = 1;
 629         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 630
 631         struct sockaddr_in serv_addr = {0};
 632         serv_addr.sin_family = AF_INET;
 633         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 634         serv_addr.sin_port = htons(port);
 635
 636         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 637                 perror("bind");
 638                 return 1;
 639         }
 640
 641         if(listen(sock, 5) < 0) {
 642                 perror("listen");
 643                 return 1;
 644         }
 645
 646         stlink_force_debug(sl);
 647         stlink_reset(sl);
 648         init_code_breakpoints(sl);
 649         init_data_watchpoints(sl);
 650
 651         printf("Listening at *:%d...\n", port);
 652
 653         int client = accept(sock, NULL, NULL);
 654         signal (SIGINT, SIG_DFL);
 655         if(client < 0) {
 656                 perror("accept");
 657                 return 1;
 658         }
 659
 660         close(sock);
 661
 662         printf("GDB connected.\n");
 663
 664         /*
 665          * To allow resetting the chip from GDB it is required to
 666          * emulate attaching and detaching to target.
 667          */
 668         unsigned int attached = 1;
 669
 670         while(1) {
 671                 char* packet;
 672
 673                 int status = gdb_recv_packet(client, &packet);
 674                 if(status < 0) {
 675                         fprintf(stderr, "cannot recv: %d\n", status);
 676                         return 1;
 677                 }
 678
 679                 #ifdef DEBUG
 680                 printf("recv: %s\n", packet);
 681                 #endif
 682
 683                 char* reply = NULL;
 684                 reg regp;
 685
 686                 switch(packet[0]) {
 687                 case 'q': {
 688                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 689                                 reply = strdup("");
 690                                 break;
 691                         }
 692
 693                         char *separator = strstr(packet, ":"), *params = "";
 694                         if(separator == NULL) {
 695                                 separator = packet + strlen(packet);
 696                         } else {
 697                                 params = separator + 1;
 698                         }
 699
 700                         unsigned queryNameLength = (separator - &packet[1]);
 701                         char* queryName = calloc(queryNameLength + 1, 1);
 702                         strncpy(queryName, &packet[1], queryNameLength);
 703
 704                         #ifdef DEBUG
 705                         printf("query: %s;%s\n", queryName, params);
 706                         #endif
 707
 708                         if(!strcmp(queryName, "Supported")) {
 709                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 710                         } else if(!strcmp(queryName, "Xfer")) {
 711                                 char *type, *op, *s_addr, *s_length;
 712                                 char *tok = params;
 713                                 char *annex __attribute__((unused));
 714
 715                                 type     = strsep(&tok, ":");
 716                                 op       = strsep(&tok, ":");
 717                                 annex    = strsep(&tok, ":");
 718                                 s_addr   = strsep(&tok, ",");
 719                                 s_length = tok;
 720
 721                                 unsigned addr = strtoul(s_addr, NULL, 16),
 722                                        length = strtoul(s_length, NULL, 16);
 723
 724                                 #ifdef DEBUG
 725                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 726                                         type, op, annex, addr, length);
 727                                 #endif
 728
 729                                 const char* data = NULL;
 730
 731                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 732                                         data = current_memory_map;
 733
 734                                 if(data) {
 735                                         unsigned data_length = strlen(data);
 736                                         if(addr + length > data_length)
 737                                                 length = data_length - addr;
 738
 739                                         if(length == 0) {
 740                                                 reply = strdup("l");
 741                                         } else {
 742                                                 reply = calloc(length + 2, 1);
 743                                                 reply[0] = 'm';
 744                                                 strncpy(&reply[1], data, length);
 745                                         }
 746                                 }
 747                         }
 748
 749                         if(reply == NULL)
 750                                 reply = strdup("");
 751
 752                         free(queryName);
 753
 754                         break;
 755                 }
 756
 757                 case 'v': {
 758                         char *params = NULL;
 759                         char *cmdName = strtok_r(packet, ":;", &params);
 760
 761                         cmdName++; // vCommand -> Command
 762
 763                         if(!strcmp(cmdName, "FlashErase")) {
 764                                 char *s_addr, *s_length;
 765                                 char *tok = params;
 766
 767                                 s_addr   = strsep(&tok, ",");
 768                                 s_length = tok;
 769
 770                                 unsigned addr = strtoul(s_addr, NULL, 16),
 771                                        length = strtoul(s_length, NULL, 16);
 772
 773                                 #ifdef DEBUG
 774                                 printf("FlashErase: addr:%08x,len:%04x\n",
 775                                         addr, length);
 776                                 #endif
 777
 778                                 if(flash_add_block(addr, length, sl) < 0) {
 779                                         reply = strdup("E00");
 780                                 } else {
 781                                         reply = strdup("OK");
 782                                 }
 783                         } else if(!strcmp(cmdName, "FlashWrite")) {
 784                                 char *s_addr, *data;
 785                                 char *tok = params;
 786
 787                                 s_addr = strsep(&tok, ":");
 788                                 data   = tok;
 789
 790                                 unsigned addr = strtoul(s_addr, NULL, 16);
 791                                 unsigned data_length = status - (data - packet);
 792
 793                                 // Length of decoded data cannot be more than
 794                                 // encoded, as escapes are removed.
 795                                 // Additional byte is reserved for alignment fix.
 796                                 uint8_t *decoded = calloc(data_length + 1, 1);
 797                                 unsigned dec_index = 0;
 798                                 for(int i = 0; i < data_length; i++) {
 799                                         if(data[i] == 0x7d) {
 800                                                 i++;
 801                                                 decoded[dec_index++] = data[i] ^ 0x20;
 802                                         } else {
 803                                                 decoded[dec_index++] = data[i];
 804                                         }
 805                                 }
 806
 807                                 // Fix alignment
 808                                 if(dec_index % 2 != 0)
 809                                         dec_index++;
 810
 811                                 #ifdef DEBUG
 812                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 813                                 #endif
 814
 815                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 816                                         reply = strdup("E00");
 817                                 } else {
 818                                         reply = strdup("OK");
 819                                 }
 820                         } else if(!strcmp(cmdName, "FlashDone")) {
 821                                 if(flash_go(sl) < 0) {
 822                                         reply = strdup("E00");
 823                                 } else {
 824                                         reply = strdup("OK");
 825                                 }
 826                         } else if(!strcmp(cmdName, "Kill")) {
 827                                 attached = 0;
 828
 829                                 reply = strdup("OK");
 830                         }
 831
 832                         if(reply == NULL)
 833                                 reply = strdup("");
 834
 835                         break;
 836                 }
 837
 838                 case 'c':
 839                         stlink_run(sl);
 840
 841                         while(1) {
 842                                 int status = gdb_check_for_interrupt(client);
 843                                 if(status < 0) {
 844                                         fprintf(stderr, "cannot check for int: %d\n", status);
 845                                         return 1;
 846                                 }
 847
 848                                 if(status == 1) {
 849                                         stlink_force_debug(sl);
 850                                         break;
 851                                 }
 852
 853                                 stlink_status(sl);
 854                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 855                                         break;
 856                                 }
 857
 858                                 usleep(100000);
 859                         }
 860
 861                         reply = strdup("S05"); // TRAP
 862                         break;
 863
 864                 case 's':
 865                         stlink_step(sl);
 866
 867                         reply = strdup("S05"); // TRAP
 868                         break;
 869
 870                 case '?':
 871                         if(attached) {
 872                                 reply = strdup("S05"); // TRAP
 873                         } else {
 874                                 /* Stub shall reply OK if not attached. */
 875                                 reply = strdup("OK");
 876                         }
 877                         break;
 878
 879                 case 'g':
 880                         stlink_read_all_regs(sl, &regp);
 881
 882                         reply = calloc(8 * 16 + 1, 1);
 883                         for(int i = 0; i < 16; i++)
 884                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 885
 886                         break;
 887
 888                 case 'p': {
 889                         unsigned id = strtoul(&packet[1], NULL, 16);
 890                         unsigned myreg = 0xDEADDEAD;
 891
 892                         if(id < 16) {
 893                                 stlink_read_reg(sl, id, &regp);
 894                                 myreg = htonl(regp.r[id]);
 895                         } else if(id == 0x19) {
 896                                 stlink_read_reg(sl, 16, &regp);
 897                                 myreg = htonl(regp.xpsr);
 898                         } else {
 899                                 reply = strdup("E00");
 900                         }
 901
 902                         reply = calloc(8 + 1, 1);
 903                         sprintf(reply, "%08x", myreg);
 904
 905                         break;
 906                 }
 907
 908                 case 'P': {
 909                         char* s_reg = &packet[1];
 910                         char* s_value = strstr(&packet[1], "=") + 1;
 911
 912                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 913                         unsigned value = strtoul(s_value, NULL, 16);
 914
 915                         if(reg < 16) {
 916                                 stlink_write_reg(sl, ntohl(value), reg);
 917                         } else if(reg == 0x19) {
 918                                 stlink_write_reg(sl, ntohl(value), 16);
 919                         } else {
 920                                 reply = strdup("E00");
 921                         }
 922
 923                         if(!reply) {
 924                                 reply = strdup("OK");
 925                         }
 926
 927                         break;
 928                 }
 929
 930                 case 'G':
 931                         for(int i = 0; i < 16; i++) {
 932                                 char str[9] = {0};
 933                                 strncpy(str, &packet[1 + i * 8], 8);
 934                                 uint32_t reg = strtoul(str, NULL, 16);
 935                                 stlink_write_reg(sl, ntohl(reg), i);
 936                         }
 937
 938                         reply = strdup("OK");
 939                         break;
 940
 941                 case 'm': {
 942                         char* s_start = &packet[1];
 943                         char* s_count = strstr(&packet[1], ",") + 1;
 944
 945                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 946                         unsigned     count = strtoul(s_count, NULL, 16);
 947
 948                         unsigned adj_start = start % 4;
 949
 950                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 951                                                 count : count + 4 - (count % 4));
 952
 953                         reply = calloc(count * 2 + 1, 1);
 954                         for(int i = 0; i < count; i++) {
 955                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 956                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 957                         }
 958
 959                         break;
 960                 }
 961
 962                 case 'M': {
 963                         char* s_start = &packet[1];
 964                         char* s_count = strstr(&packet[1], ",") + 1;
 965                         char* hexdata = strstr(packet, ":") + 1;
 966
 967                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 968                         unsigned     count = strtoul(s_count, NULL, 16);
 969
 970                         for(int i = 0; i < count; i ++) {
 971                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 972                                 uint8_t byte = strtoul(hex, NULL, 16);
 973                                 sl->q_buf[i] = byte;
 974                         }
 975
 976                         if((count % 4) == 0 && (start % 4) == 0) {
 977                                 stlink_write_mem32(sl, start, count);
 978                         } else {
 979                                 stlink_write_mem8(sl, start, count);
 980                         }
 981
 982                         reply = strdup("OK");
 983
 984                         break;
 985                 }
 986
 987                 case 'Z': {
 988                         char *endptr;
 989                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 990                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 991
 992                         switch (packet[1]) {
 993                                 case '1':
 994                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 995                                         reply = strdup("E00");
 996                                 } else {
 997                                         reply = strdup("OK");
 998                                 }
 999                                 break;
1000
1001                                 case '2':   // insert write watchpoint
1002                                 case '3':   // insert read  watchpoint
1003                                 case '4':   // insert access watchpoint
1004                                 {
1005                                         enum watchfun wf;
1006                                         if(packet[1] == '2') {
1007                                                 wf = WATCHWRITE;
1008                                         } else if(packet[1] == '3') {
1009                                                 wf = WATCHREAD;
1010                                         } else {
1011                                                 wf = WATCHACCESS;
1012                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1013                                                         reply = strdup("E00");
1014                                                 } else {
1015                                                         reply = strdup("OK");
1016                                                         break;
1017                                                 }
1018                                         }
1019                                 }
1020
1021                                 default:
1022                                 reply = strdup("");
1023                         }
1024                         break;
1025                 }
1026                 case 'z': {
1027                         char *endptr;
1028                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1029                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1030
1031                         switch (packet[1]) {
1032                                 case '1': // remove breakpoint
1033                                 update_code_breakpoint(sl, addr, 0);
1034                                 reply = strdup("OK");
1035                                 break;
1036
1037                                 case '2' : // remove write watchpoint
1038                                 case '3' : // remove read watchpoint
1039                                 case '4' : // remove access watchpoint
1040                                 if(delete_data_watchpoint(sl, addr) < 0) {
1041                                         reply = strdup("E00");
1042                                 } else {
1043                                         reply = strdup("OK");
1044                                         break;
1045                                 }
1046
1047                                 default:
1048                                 reply = strdup("");
1049                         }
1050                         break;
1051                 }
1052
1053                 case '!': {
1054                         /*
1055                          * Enter extended mode which allows restarting.
1056                          * We do support that always.
1057                          */
1058
1059                         reply = strdup("OK");
1060
1061                         break;
1062                 }
1063
1064                 case 'R': {
1065                         /* Reset the core. */
1066
1067                         stlink_reset(sl);
1068                         init_code_breakpoints(sl);
1069                         init_data_watchpoints(sl);
1070
1071                         attached = 1;
1072
1073                         reply = strdup("OK");
1074
1075                         break;
1076                 }
1077
1078                 default:
1079                         reply = strdup("");
1080                 }
1081
1082                 if(reply) {
1083                         #ifdef DEBUG
1084                         printf("send: %s\n", reply);
1085                         #endif
1086
1087                         int result = gdb_send_packet(client, reply);
1088                         if(result != 0) {
1089                                 fprintf(stderr, "cannot send: %d\n", result);
1090                                 return 1;
1091                         }
1092
1093                         free(reply);
1094                 }
1095
1096                 free(packet);
1097         }
1098
1099         return 0;
1100 }