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 <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <sys/socket.h>
  15 #include <netinet/in.h>
  16 #include <arpa/inet.h>
  17 #include <signal.h>
  18
  19 #include <stlink-common.h>
  20
  21 #include "gdb-remote.h"
  22
  23 #define FLASH_BASE 0x08000000
  24 #define FLASH_PAGE (sl->flash_pgsz)
  25 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  26 #define FLASH_SIZE (FLASH_PAGE * 128)
  27
  28 volatile int do_exit = 0;
  29 void ctrl_c(int sig)
  30 {
  31   do_exit = 1;
  32 }
  33
  34 static const char hex[] = "0123456789abcdef";
  35
  36 static const char* current_memory_map = NULL;
  37
  38 /*
  39  * Chip IDs are explained in the appropriate programming manual for the
  40  * DBGMCU_IDCODE register (0xE0042000)
  41  */
  42
  43 #define CORE_M3_R1 0x1BA00477
  44 #define CORE_M3_R2 0x4BA00477
  45 #define CORE_M4_R0 0x2BA01477
  46
  47 struct chip_params {
  48         uint32_t chip_id;
  49         char* description;
  50         uint32_t flash_size_reg;
  51         uint32_t max_flash_size, flash_pagesize;
  52         uint32_t sram_size;
  53         uint32_t bootrom_base, bootrom_size;
  54 } const devices[] = {
  55         { 0x410, "F1 Medium-density device", 0x1ffff7e0,
  56           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  }, // table 2, pm0063
  57         { 0x411, "F2 device", 0, /* No flash size register found in the docs*/
  58           0x100000,   0x20000, 0x20000, 0x1fff0000, 0x7800  }, // table 1, pm0059
  59         { 0x412, "F1 Low-density device", 0x1ffff7e0,
  60           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  }, // table 1, pm0063
  61         { 0x413, "F4 device", 0x1FFF7A10,
  62           0x100000,   0x20000, 0x30000,  0x1fff0000, 0x7800  }, // table 1, pm0081
  63         { 0x414, "F1 High-density device", 0x1ffff7e0,
  64           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },  // table 3 pm0063
  65           // This ignores the EEPROM! (and uses the page erase size,
  66           // not the sector write protection...)
  67         { 0x416, "L1 Med-density device", 0x1FF8004C, // table 1, pm0062
  68           0x20000, 0x100, 0x4000, 0x1ff00000, 0x1000 },
  69         { 0x418, "F1 Connectivity line device", 0x1ffff7e0,
  70           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  71         { 0x420, "F1 Medium-density value line device", 0x1ffff7e0,
  72           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  73         { 0x428, "F1 High-density value line device", 0x1ffff7e0,
  74           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  75         { 0x430, "F1 XL-density device", 0x1ffff7e0,  // pm0068
  76           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  77         { 0 }
  78 };
  79
  80 int serve(stlink_t *sl, int port);
  81 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  82
  83 int main(int argc, char** argv) {
  84
  85         stlink_t *sl = NULL;
  86         int port = 0;
  87
  88         const char * HelpStr =  "\nUsage:\n"
  89                                  "\tst-util [Arguments]\n"
  90                                  "\tArguments (no more than 2):\n"
  91                                   "\t\t<Port>: Port. Default: 4242.\n"
  92                                   "\t\t{usb|sgauto|/dev/sgX}: Transport, "
  93                                    "where X = {0, 1, 2, ...}. Default: USB.\n"
  94                                  "\tExamples:\n"
  95                                   "\t\tst-util 1234\n"
  96                                   "\t\tst-util sgauto\n"
  97                                   "\t\tst-util 1234 usb\n"
  98                                   "\t\tst-util /dev/sgX 1234\n"
  99                                   "\t\tst-util 1234 /dev/sgX\n";
 100
 101
 102         // Parsing the arguments of command line ...
 103
 104         if (argc == 1 || argc > 3) {
 105             fprintf(stderr, HelpStr, NULL);
 106             return 1;
 107         }
 108
 109         for(int a = 1; a < argc; a++) {
 110
 111             // Port
 112             int p = atoi(argv[a]);
 113             if (p < 0 || p > 0xFFFF) {
 114                 fprintf(stderr, "Invalid port\n");
 115                 fprintf(stderr, HelpStr, NULL);
 116                 return 1;
 117             }
 118             if (p > 0 && port == 0) {port = p; continue;}
 119
 120             // if (p == 0) ...
 121
 122             if (sl != NULL) {
 123                 fprintf(stderr, "Invalid argumets\n");
 124                 fprintf(stderr, HelpStr, NULL);
 125                 return 1;
 126             }
 127
 128             // usb
 129             if (!strcmp(argv[a], "usb")) {
 130                 sl = stlink_open_usb(10);
 131                 if(sl == NULL) return 1;
 132                 continue;
 133             }
 134
 135             // /dev/sgX
 136             if (!strncmp(argv[a], "/dev/sgX", 7)) {
 137                 if(!CONFIG_USE_LIBSG) {
 138                     fprintf(stderr, "libsg not use\n");
 139                     return 1;
 140                 }
 141                 sl = stlink_quirk_open(argv[a], 0);
 142                 if(sl == NULL) return 1;
 143                 continue;
 144             }
 145
 146             // sg_auto
 147             if (!strcmp(argv[a], "sgauto")) {
 148                 if(!CONFIG_USE_LIBSG) {
 149                     fprintf(stderr, "libsg not use\n");
 150                     return 1;
 151                 }
 152
 153                 // Search ST-LINK (from /dev/sg0 to /dev/sg99)
 154                 for(int DevNum = 0; DevNum <= 99; DevNum++)
 155                 {
 156                     if(DevNum < 10) {
 157                         char DevName[] = "/dev/sgX";
 158                         DevName[7] = DevNum + '0';
 159                         if ( !access(DevName, F_OK) )
 160                             sl = stlink_quirk_open(DevName, 0);
 161                     }
 162                     else {
 163                         char DevName[] = "/dev/sgXY";
 164                         DevName[7] = DevNum/10 + '0';
 165                         DevName[8] = DevNum%10 + '0';
 166                         if ( !access(DevName, F_OK) )
 167                             sl = stlink_quirk_open(DevName, 0);
 168                     }
 169                     if (sl != NULL) break;
 170                 }
 171
 172                 if(sl == NULL) return 1;
 173                 continue;
 174             }
 175
 176             // Invalid argumets
 177             fprintf(stderr, "Invalid argumets\n");
 178             fprintf(stderr, HelpStr, NULL);
 179             return 1;
 180         }
 181
 182         // Default transport: USB
 183         if (sl == NULL) sl = stlink_open_usb(10);
 184         // Default port: 4242
 185         if (port == 0) port = 4242;
 186
 187         // End parsing
 188
 189
 190         if (sl == NULL) return 1;
 191
 192         if (stlink_current_mode(sl) == STLINK_DEV_DFU_MODE) {
 193                 stlink_exit_dfu_mode(sl);
 194         }
 195
 196         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE) {
 197           stlink_enter_swd_mode(sl);
 198         }
 199
 200         uint32_t chip_id = stlink_chip_id(sl);
 201         uint32_t core_id = stlink_core_id(sl);
 202
 203         /* Fix chip_id for F4 */
 204         if (((chip_id & 0xFFF) == 0x411) && (core_id == CORE_M4_R0)) {
 205           printf("Fixing wrong chip_id for STM32F4 Rev A errata\n");
 206           chip_id = 0x413;
 207         }
 208
 209         printf("Chip ID is %08x, Core ID is  %08x.\n", chip_id, core_id);
 210
 211         const struct chip_params* params = NULL;
 212
 213         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
 214                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
 215                         params = &devices[i];
 216                         break;
 217                 }
 218         }
 219
 220         if(params == NULL) {
 221                 fprintf(stderr, "Cannot recognize the connected device!\n");
 222                 return 0;
 223         }
 224
 225         printf("Device connected: %s\n", params->description);
 226         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 227                 params->sram_size, params->max_flash_size, params->flash_pagesize);
 228
 229         FLASH_PAGE = params->flash_pagesize;
 230
 231         uint32_t flash_size;
 232
 233         stlink_read_mem32(sl, params->flash_size_reg, 4);
 234         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 235
 236         printf("Flash size is %d KiB.\n", flash_size);
 237         // memory map is in 1k blocks.
 238         current_memory_map = make_memory_map(params, flash_size * 0x400);
 239
 240         while(serve(sl, port) == 0);
 241
 242         /* Switch back to mass storage mode before closing. */
 243         stlink_run(sl);
 244         stlink_exit_debug_mode(sl);
 245         stlink_close(sl);
 246
 247         return 0;
 248 }
 249
 250 static const char* const memory_map_template =
 251   "<?xml version=\"1.0\"?>"
 252   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 253   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 254   "<memory-map>"
 255   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 256   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 257   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 258   "    <property name=\"blocksize\">0x%x</property>"
 259   "  </memory>"
 260   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 261   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 262   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 263   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 264   "</memory-map>";
 265
 266 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 267         /* This will be freed in serve() */
 268         char* map = malloc(4096);
 269         map[0] = '\0';
 270
 271         snprintf(map, 4096, memory_map_template,
 272                         flash_size,
 273                         params->sram_size,
 274                         flash_size, params->flash_pagesize,
 275                         params->bootrom_base, params->bootrom_size);
 276
 277         return map;
 278 }
 279
 280
 281 /*
 282  * DWT_COMP0     0xE0001020
 283  * DWT_MASK0     0xE0001024
 284  * DWT_FUNCTION0 0xE0001028
 285  * DWT_COMP1     0xE0001030
 286  * DWT_MASK1     0xE0001034
 287  * DWT_FUNCTION1 0xE0001038
 288  * DWT_COMP2     0xE0001040
 289  * DWT_MASK2     0xE0001044
 290  * DWT_FUNCTION2 0xE0001048
 291  * DWT_COMP3     0xE0001050
 292  * DWT_MASK3     0xE0001054
 293  * DWT_FUNCTION3 0xE0001058
 294  */
 295
 296 #define DATA_WATCH_NUM 4
 297
 298 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 299
 300 struct code_hw_watchpoint {
 301         stm32_addr_t addr;
 302         uint8_t mask;
 303         enum watchfun fun;
 304 };
 305
 306 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 307
 308 static void init_data_watchpoints(stlink_t *sl) {
 309         #ifdef DEBUG
 310         printf("init watchpoints\n");
 311         #endif
 312
 313         // set trcena in debug command to turn on dwt unit
 314         stlink_read_mem32(sl, 0xE000EDFC, 4);
 315         sl->q_buf[3] |= 1;
 316         stlink_write_mem32(sl, 0xE000EDFC, 4);
 317
 318         // make sure all watchpoints are cleared
 319         memset(sl->q_buf, 0, 4);
 320         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 321                 data_watches[i].fun = WATCHDISABLED;
 322                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 323         }
 324 }
 325
 326 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 327 {
 328         int i = 0;
 329         uint32_t mask;
 330
 331         // computer mask
 332         // find a free watchpoint
 333         // configure
 334
 335         mask = -1;
 336         i = len;
 337         while(i) {
 338                 i >>= 1;
 339                 mask++;
 340         }
 341
 342         if((mask != -1) && (mask < 16)) {
 343                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 344                         // is this an empty slot ?
 345                         if(data_watches[i].fun == WATCHDISABLED) {
 346                                 #ifdef DEBUG
 347                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 348                                 #endif
 349
 350                                 data_watches[i].fun = wf;
 351                                 data_watches[i].addr = addr;
 352                                 data_watches[i].mask = mask;
 353
 354                                 // insert comparator address
 355                                 sl->q_buf[0] = (addr & 0xff);
 356                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 357                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 358                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 359
 360                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 361
 362                                 // insert mask
 363                                 memset(sl->q_buf, 0, 4);
 364                                 sl->q_buf[0] = mask;
 365                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 366
 367                                 // insert function
 368                                 memset(sl->q_buf, 0, 4);
 369                                 sl->q_buf[0] = wf;
 370                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 371
 372                                 // just to make sure the matched bit is clear !
 373                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 374                                 return 0;
 375                         }
 376                 }
 377         }
 378
 379         #ifdef DEBUG
 380         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 381         #endif
 382         return -1;
 383 }
 384
 385 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 386 {
 387         int i;
 388
 389         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 390                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 391                         #ifdef DEBUG
 392                         printf("delete watchpoint %d addr %x\n", i, addr);
 393                         #endif
 394
 395                         memset(sl->q_buf, 0, 4);
 396                         data_watches[i].fun = WATCHDISABLED;
 397                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 398
 399                         return 0;
 400                 }
 401         }
 402
 403         #ifdef DEBUG
 404         printf("failure: delete watchpoint addr %x\n", addr);
 405         #endif
 406
 407         return -1;
 408 }
 409
 410 #define CODE_BREAK_NUM  6
 411 #define CODE_BREAK_LOW  0x01
 412 #define CODE_BREAK_HIGH 0x02
 413
 414 struct code_hw_breakpoint {
 415         stm32_addr_t addr;
 416         int          type;
 417 };
 418
 419 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 420
 421 static void init_code_breakpoints(stlink_t *sl) {
 422         memset(sl->q_buf, 0, 4);
 423         sl->q_buf[0] = 0x03; // KEY | ENABLE
 424         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 425         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 426         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 427
 428         memset(sl->q_buf, 0, 4);
 429         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 430                 code_breaks[i].type = 0;
 431                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 432         }
 433 }
 434
 435 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 436         stm32_addr_t fpb_addr = addr & ~0x3;
 437         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 438
 439         if(addr & 1) {
 440                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 441                 return -1;
 442         }
 443
 444         int id = -1;
 445         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 446                 if(fpb_addr == code_breaks[i].addr ||
 447                         (set && code_breaks[i].type == 0)) {
 448                         id = i;
 449                         break;
 450                 }
 451         }
 452
 453         if(id == -1) {
 454                 if(set) return -1; // Free slot not found
 455                 else    return 0;  // Breakpoint is already removed
 456         }
 457
 458         struct code_hw_breakpoint* brk = &code_breaks[id];
 459
 460         brk->addr = fpb_addr;
 461
 462         if(set) brk->type |= type;
 463         else    brk->type &= ~type;
 464
 465         memset(sl->q_buf, 0, 4);
 466
 467         if(brk->type == 0) {
 468                 #ifdef DEBUG
 469                 printf("clearing hw break %d\n", id);
 470                 #endif
 471
 472                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 473         } else {
 474                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 475                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 476                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 477                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 478
 479                 #ifdef DEBUG
 480                 printf("setting hw break %d at %08x (%d)\n",
 481                         id, brk->addr, brk->type);
 482                 printf("reg %02x %02x %02x %02x\n",
 483                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 484                 #endif
 485
 486                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 487         }
 488
 489         return 0;
 490 }
 491
 492
 493 struct flash_block {
 494         stm32_addr_t addr;
 495         unsigned     length;
 496         uint8_t*     data;
 497
 498         struct flash_block* next;
 499 };
 500
 501 static struct flash_block* flash_root;
 502
 503 static int flash_add_block(stm32_addr_t addr, unsigned length,
 504                            stlink_t *sl) {
 505         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 506                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 507                 return -1;
 508         }
 509
 510         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 511                 fprintf(stderr, "flash_add_block: unaligned block\n");
 512                 return -1;
 513         }
 514
 515         struct flash_block* new = malloc(sizeof(struct flash_block));
 516         new->next = flash_root;
 517
 518         new->addr   = addr;
 519         new->length = length;
 520         new->data   = calloc(length, 1);
 521
 522         flash_root = new;
 523
 524         return 0;
 525 }
 526
 527 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 528         int fit_blocks = 0, fit_length = 0;
 529
 530         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 531                 /* Block: ------X------Y--------
 532                  * Data:            a-----b
 533                  *                a--b
 534                  *            a-----------b
 535                  * Block intersects with data, if:
 536                  *  a < Y && b > x
 537                  */
 538
 539                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 540                 unsigned a = addr, b = addr + length;
 541                 if(a < Y && b > X) {
 542                         // from start of the block
 543                         unsigned start = (a > X ? a : X) - X;
 544                         unsigned end   = (b > Y ? Y : b) - X;
 545
 546                         memcpy(fb->data + start, data, end - start);
 547
 548                         fit_blocks++;
 549                         fit_length += end - start;
 550                 }
 551         }
 552
 553         if(fit_blocks == 0) {
 554                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 555                 return -1;
 556         }
 557
 558         if(fit_length != length) {
 559                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 560                         addr, length, fit_length);
 561                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int flash_go(stlink_t *sl) {
 568         int error = -1;
 569
 570         // Some kinds of clock settings do not allow writing to flash.
 571         stlink_reset(sl);
 572
 573         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 574                 #ifdef DEBUG
 575                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 576                 #endif
 577
 578                 unsigned length = fb->length;
 579                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 580                         #ifdef DEBUG
 581                         printf("flash_do: page %08x\n", page);
 582                         #endif
 583
 584                         stlink_erase_flash_page(sl, page);
 585
 586                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 587                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 588                                 goto error;
 589                 }
 590
 591         }
 592
 593         stlink_reset(sl);
 594
 595         error = 0;
 596
 597 error:
 598         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 599                 next = fb->next;
 600                 free(fb->data);
 601                 free(fb);
 602         }
 603
 604         flash_root = NULL;
 605
 606         return error;
 607 }
 608
 609 int serve(stlink_t *sl, int port) {
 610         int sock = socket(AF_INET, SOCK_STREAM, 0);
 611         if(sock < 0) {
 612                 perror("socket");
 613                 return 1;
 614         }
 615
 616         unsigned int val = 1;
 617         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 618
 619         struct sockaddr_in serv_addr = {0};
 620         serv_addr.sin_family = AF_INET;
 621         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 622         serv_addr.sin_port = htons(port);
 623
 624         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 625                 perror("bind");
 626                 return 1;
 627         }
 628
 629         if(listen(sock, 5) < 0) {
 630                 perror("listen");
 631                 return 1;
 632         }
 633
 634         stlink_force_debug(sl);
 635         stlink_reset(sl);
 636         init_code_breakpoints(sl);
 637         init_data_watchpoints(sl);
 638
 639         printf("Listening at *:%d...\n", port);
 640
 641         (void) signal (SIGINT, ctrl_c);
 642         int client = accept(sock, NULL, NULL);
 643         signal (SIGINT, SIG_DFL);
 644         if(client < 0) {
 645                 perror("accept");
 646                 return 1;
 647         }
 648
 649         close(sock);
 650
 651         printf("GDB connected.\n");
 652
 653         /*
 654          * To allow resetting the chip from GDB it is required to
 655          * emulate attaching and detaching to target.
 656          */
 657         unsigned int attached = 1;
 658
 659         while(1) {
 660                 char* packet;
 661
 662                 int status = gdb_recv_packet(client, &packet);
 663                 if(status < 0) {
 664                         fprintf(stderr, "cannot recv: %d\n", status);
 665                         return 1;
 666                 }
 667
 668                 #ifdef DEBUG
 669                 printf("recv: %s\n", packet);
 670                 #endif
 671
 672                 char* reply = NULL;
 673                 reg regp;
 674
 675                 switch(packet[0]) {
 676                 case 'q': {
 677                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 678                                 reply = strdup("");
 679                                 break;
 680                         }
 681
 682                         char *separator = strstr(packet, ":"), *params = "";
 683                         if(separator == NULL) {
 684                                 separator = packet + strlen(packet);
 685                         } else {
 686                                 params = separator + 1;
 687                         }
 688
 689                         unsigned queryNameLength = (separator - &packet[1]);
 690                         char* queryName = calloc(queryNameLength + 1, 1);
 691                         strncpy(queryName, &packet[1], queryNameLength);
 692
 693                         #ifdef DEBUG
 694                         printf("query: %s;%s\n", queryName, params);
 695                         #endif
 696
 697                         if(!strcmp(queryName, "Supported")) {
 698                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 699                         } else if(!strcmp(queryName, "Xfer")) {
 700                                 char *type, *op, *s_addr, *s_length;
 701                                 char *tok = params;
 702                                 char *annex __attribute__((unused));
 703
 704                                 type     = strsep(&tok, ":");
 705                                 op       = strsep(&tok, ":");
 706                                 annex    = strsep(&tok, ":");
 707                                 s_addr   = strsep(&tok, ",");
 708                                 s_length = tok;
 709
 710                                 unsigned addr = strtoul(s_addr, NULL, 16),
 711                                        length = strtoul(s_length, NULL, 16);
 712
 713                                 #ifdef DEBUG
 714                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 715                                         type, op, annex, addr, length);
 716                                 #endif
 717
 718                                 const char* data = NULL;
 719
 720                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 721                                         data = current_memory_map;
 722
 723                                 if(data) {
 724                                         unsigned data_length = strlen(data);
 725                                         if(addr + length > data_length)
 726                                                 length = data_length - addr;
 727
 728                                         if(length == 0) {
 729                                                 reply = strdup("l");
 730                                         } else {
 731                                                 reply = calloc(length + 2, 1);
 732                                                 reply[0] = 'm';
 733                                                 strncpy(&reply[1], data, length);
 734                                         }
 735                                 }
 736                         }
 737
 738                         if(reply == NULL)
 739                                 reply = strdup("");
 740
 741                         free(queryName);
 742
 743                         break;
 744                 }
 745
 746                 case 'v': {
 747                         char *params = NULL;
 748                         char *cmdName = strtok_r(packet, ":;", &params);
 749
 750                         cmdName++; // vCommand -> Command
 751
 752                         if(!strcmp(cmdName, "FlashErase")) {
 753                                 char *s_addr, *s_length;
 754                                 char *tok = params;
 755
 756                                 s_addr   = strsep(&tok, ",");
 757                                 s_length = tok;
 758
 759                                 unsigned addr = strtoul(s_addr, NULL, 16),
 760                                        length = strtoul(s_length, NULL, 16);
 761
 762                                 #ifdef DEBUG
 763                                 printf("FlashErase: addr:%08x,len:%04x\n",
 764                                         addr, length);
 765                                 #endif
 766
 767                                 if(flash_add_block(addr, length, sl) < 0) {
 768                                         reply = strdup("E00");
 769                                 } else {
 770                                         reply = strdup("OK");
 771                                 }
 772                         } else if(!strcmp(cmdName, "FlashWrite")) {
 773                                 char *s_addr, *data;
 774                                 char *tok = params;
 775
 776                                 s_addr = strsep(&tok, ":");
 777                                 data   = tok;
 778
 779                                 unsigned addr = strtoul(s_addr, NULL, 16);
 780                                 unsigned data_length = status - (data - packet);
 781
 782                                 // Length of decoded data cannot be more than
 783                                 // encoded, as escapes are removed.
 784                                 // Additional byte is reserved for alignment fix.
 785                                 uint8_t *decoded = calloc(data_length + 1, 1);
 786                                 unsigned dec_index = 0;
 787                                 for(int i = 0; i < data_length; i++) {
 788                                         if(data[i] == 0x7d) {
 789                                                 i++;
 790                                                 decoded[dec_index++] = data[i] ^ 0x20;
 791                                         } else {
 792                                                 decoded[dec_index++] = data[i];
 793                                         }
 794                                 }
 795
 796                                 // Fix alignment
 797                                 if(dec_index % 2 != 0)
 798                                         dec_index++;
 799
 800                                 #ifdef DEBUG
 801                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 802                                 #endif
 803
 804                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 805                                         reply = strdup("E00");
 806                                 } else {
 807                                         reply = strdup("OK");
 808                                 }
 809                         } else if(!strcmp(cmdName, "FlashDone")) {
 810                                 if(flash_go(sl) < 0) {
 811                                         reply = strdup("E00");
 812                                 } else {
 813                                         reply = strdup("OK");
 814                                 }
 815                         } else if(!strcmp(cmdName, "Kill")) {
 816                                 attached = 0;
 817
 818                                 reply = strdup("OK");
 819                         }
 820
 821                         if(reply == NULL)
 822                                 reply = strdup("");
 823
 824                         break;
 825                 }
 826
 827                 case 'c':
 828                         stlink_run(sl);
 829
 830                         while(1) {
 831                                 int status = gdb_check_for_interrupt(client);
 832                                 if(status < 0) {
 833                                         fprintf(stderr, "cannot check for int: %d\n", status);
 834                                         return 1;
 835                                 }
 836
 837                                 if(status == 1) {
 838                                         stlink_force_debug(sl);
 839                                         break;
 840                                 }
 841
 842                                 stlink_status(sl);
 843                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 844                                         break;
 845                                 }
 846
 847                                 usleep(100000);
 848                         }
 849
 850                         reply = strdup("S05"); // TRAP
 851                         break;
 852
 853                 case 's':
 854                         stlink_step(sl);
 855
 856                         reply = strdup("S05"); // TRAP
 857                         break;
 858
 859                 case '?':
 860                         if(attached) {
 861                                 reply = strdup("S05"); // TRAP
 862                         } else {
 863                                 /* Stub shall reply OK if not attached. */
 864                                 reply = strdup("OK");
 865                         }
 866                         break;
 867
 868                 case 'g':
 869                         stlink_read_all_regs(sl, &regp);
 870
 871                         reply = calloc(8 * 16 + 1, 1);
 872                         for(int i = 0; i < 16; i++)
 873                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 874
 875                         break;
 876
 877                 case 'p': {
 878                         unsigned id = strtoul(&packet[1], NULL, 16);
 879                         unsigned myreg = 0xDEADDEAD;
 880
 881                         if(id < 16) {
 882                                 stlink_read_reg(sl, id, &regp);
 883                                 myreg = htonl(regp.r[id]);
 884                         } else if(id == 0x19) {
 885                                 stlink_read_reg(sl, 16, &regp);
 886                                 myreg = htonl(regp.xpsr);
 887                         } else {
 888                                 reply = strdup("E00");
 889                         }
 890
 891                         reply = calloc(8 + 1, 1);
 892                         sprintf(reply, "%08x", myreg);
 893
 894                         break;
 895                 }
 896
 897                 case 'P': {
 898                         char* s_reg = &packet[1];
 899                         char* s_value = strstr(&packet[1], "=") + 1;
 900
 901                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 902                         unsigned value = strtoul(s_value, NULL, 16);
 903
 904                         if(reg < 16) {
 905                                 stlink_write_reg(sl, ntohl(value), reg);
 906                         } else if(reg == 0x19) {
 907                                 stlink_write_reg(sl, ntohl(value), 16);
 908                         } else {
 909                                 reply = strdup("E00");
 910                         }
 911
 912                         if(!reply) {
 913                                 reply = strdup("OK");
 914                         }
 915
 916                         break;
 917                 }
 918
 919                 case 'G':
 920                         for(int i = 0; i < 16; i++) {
 921                                 char str[9] = {0};
 922                                 strncpy(str, &packet[1 + i * 8], 8);
 923                                 uint32_t reg = strtoul(str, NULL, 16);
 924                                 stlink_write_reg(sl, ntohl(reg), i);
 925                         }
 926
 927                         reply = strdup("OK");
 928                         break;
 929
 930                 case 'm': {
 931                         char* s_start = &packet[1];
 932                         char* s_count = strstr(&packet[1], ",") + 1;
 933
 934                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 935                         unsigned     count = strtoul(s_count, NULL, 16);
 936
 937                         unsigned adj_start = start % 4;
 938
 939                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 940                                                 count : count + 4 - (count % 4));
 941
 942                         reply = calloc(count * 2 + 1, 1);
 943                         for(int i = 0; i < count; i++) {
 944                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 945                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 946                         }
 947
 948                         break;
 949                 }
 950
 951                 case 'M': {
 952                         char* s_start = &packet[1];
 953                         char* s_count = strstr(&packet[1], ",") + 1;
 954                         char* hexdata = strstr(packet, ":") + 1;
 955
 956                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 957                         unsigned     count = strtoul(s_count, NULL, 16);
 958
 959                         for(int i = 0; i < count; i ++) {
 960                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 961                                 uint8_t byte = strtoul(hex, NULL, 16);
 962                                 sl->q_buf[i] = byte;
 963                         }
 964
 965                         if((count % 4) == 0 && (start % 4) == 0) {
 966                                 stlink_write_mem32(sl, start, count);
 967                         } else {
 968                                 stlink_write_mem8(sl, start, count);
 969                         }
 970
 971                         reply = strdup("OK");
 972
 973                         break;
 974                 }
 975
 976                 case 'Z': {
 977                         char *endptr;
 978                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 979                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 980
 981                         switch (packet[1]) {
 982                                 case '1':
 983                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 984                                         reply = strdup("E00");
 985                                 } else {
 986                                         reply = strdup("OK");
 987                                 }
 988                                 break;
 989
 990                                 case '2':   // insert write watchpoint
 991                                 case '3':   // insert read  watchpoint
 992                                 case '4':   // insert access watchpoint
 993                                 {
 994                                         enum watchfun wf;
 995                                         if(packet[1] == '2') {
 996                                                 wf = WATCHWRITE;
 997                                         } else if(packet[1] == '3') {
 998                                                 wf = WATCHREAD;
 999                                         } else {
1000                                                 wf = WATCHACCESS;
1001                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1002                                                         reply = strdup("E00");
1003                                                 } else {
1004                                                         reply = strdup("OK");
1005                                                         break;
1006                                                 }
1007                                         }
1008                                 }
1009
1010                                 default:
1011                                 reply = strdup("");
1012                         }
1013                         break;
1014                 }
1015                 case 'z': {
1016                         char *endptr;
1017                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1018                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1019
1020                         switch (packet[1]) {
1021                                 case '1': // remove breakpoint
1022                                 update_code_breakpoint(sl, addr, 0);
1023                                 reply = strdup("OK");
1024                                 break;
1025
1026                                 case '2' : // remove write watchpoint
1027                                 case '3' : // remove read watchpoint
1028                                 case '4' : // remove access watchpoint
1029                                 if(delete_data_watchpoint(sl, addr) < 0) {
1030                                         reply = strdup("E00");
1031                                 } else {
1032                                         reply = strdup("OK");
1033                                         break;
1034                                 }
1035
1036                                 default:
1037                                 reply = strdup("");
1038                         }
1039                         break;
1040                 }
1041
1042                 case '!': {
1043                         /*
1044                          * Enter extended mode which allows restarting.
1045                          * We do support that always.
1046                          */
1047
1048                         reply = strdup("OK");
1049
1050                         break;
1051                 }
1052
1053                 case 'R': {
1054                         /* Reset the core. */
1055
1056                         stlink_reset(sl);
1057                         init_code_breakpoints(sl);
1058                         init_data_watchpoints(sl);
1059
1060                         attached = 1;
1061
1062                         reply = strdup("OK");
1063
1064                         break;
1065                 }
1066
1067                 default:
1068                         reply = strdup("");
1069                 }
1070
1071                 if(reply) {
1072                         #ifdef DEBUG
1073                         printf("send: %s\n", reply);
1074                         #endif
1075
1076                         int result = gdb_send_packet(client, reply);
1077                         if(result != 0) {
1078                                 fprintf(stderr, "cannot send: %d\n", result);
1079                                 return 1;
1080                         }
1081
1082                         free(reply);
1083                 }
1084
1085                 free(packet);
1086         }
1087
1088         return 0;
1089 }