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