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