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