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 "gdb-remote.h"
  18 #include "stlink-hw.h"
  19
  20 #define FLASH_BASE 0x08000000
  21 #define FLASH_PAGE (sl->flash_pgsz)
  22 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  23 #define FLASH_SIZE (FLASH_PAGE * 128)
  24
  25 static const char hex[] = "0123456789abcdef";
  26
  27 static const char* current_memory_map = NULL;
  28
  29 struct chip_params {
  30         uint32_t chip_id;
  31         char* description;
  32         uint32_t max_flash_size, flash_pagesize;
  33         uint32_t sram_size;
  34         uint32_t bootrom_base, bootrom_size;
  35 } const devices[] = {
  36         { 0x412, "Low-density device",
  37           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  },
  38         { 0x410, "Medium-density device",
  39           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  },
  40         { 0x414, "High-density device",
  41           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },
  42         { 0x418, "Connectivity line device",
  43           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  44         { 0x420, "Medium-density value line device",
  45           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  46         { 0x428, "High-density value line device",
  47           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  48         { 0x430, "XL-density device",
  49           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  50         { 0 }
  51 };
  52
  53 int serve(struct stlink* sl, int port);
  54 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  55
  56 int main(int argc, char** argv) {
  57         if(argc != 3) {
  58                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  59                 return 1;
  60         }
  61
  62         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  63         if (sl == NULL)
  64                 return 1;
  65
  66         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  67                 stlink_enter_swd_mode(sl);
  68
  69         uint32_t chip_id;
  70
  71         stlink_read_mem32(sl, 0xE0042000, 4);
  72         chip_id = sl->q_buf[0] | (sl->q_buf[1] << 8) | (sl->q_buf[2] << 16) |
  73                 (sl->q_buf[3] << 24);
  74
  75         printf("Chip ID is %08x.\n", chip_id);
  76
  77         const struct chip_params* params = NULL;
  78
  79         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
  80                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
  81                         params = &devices[i];
  82                         break;
  83                 }
  84         }
  85
  86         if(params == NULL) {
  87                 fprintf(stderr, "Cannot recognize the connected device!\n");
  88                 return 0;
  89         }
  90
  91         printf("Device connected: %s\n", params->description);
  92         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
  93                 params->sram_size, params->max_flash_size, params->flash_pagesize);
  94
  95         FLASH_PAGE = params->flash_pagesize;
  96
  97         uint32_t flash_size;
  98
  99         stlink_read_mem32(sl, 0x1FFFF7E0, 4);
 100         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 101
 102         printf("Flash size is %d KiB.\n", flash_size);
 103         // memory map is in 1k blocks.
 104         current_memory_map = make_memory_map(params, flash_size * 0x400);
 105
 106         int port = atoi(argv[1]);
 107
 108         while(serve(sl, port) == 0);
 109
 110         stlink_close(sl);
 111
 112         return 0;
 113 }
 114
 115 static const char* const memory_map_template =
 116   "<?xml version=\"1.0\"?>"
 117   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 118   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 119   "<memory-map>"
 120   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 121   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 122   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 123   "    <property name=\"blocksize\">0x%x</property>"
 124   "  </memory>"
 125   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 126   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 127   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 128   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 129   "</memory-map>";
 130
 131 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 132         /* This will be freed in serve() */
 133         char* map = malloc(4096);
 134         map[0] = '\0';
 135
 136         snprintf(map, 4096, memory_map_template,
 137                         flash_size,
 138                         params->sram_size,
 139                         flash_size, params->flash_pagesize,
 140                         params->bootrom_base, params->bootrom_size);
 141
 142         return map;
 143 }
 144
 145
 146 /*
 147  * DWT_COMP0     0xE0001020
 148  * DWT_MASK0     0xE0001024
 149  * DWT_FUNCTION0 0xE0001028
 150  * DWT_COMP1     0xE0001030
 151  * DWT_MASK1     0xE0001034
 152  * DWT_FUNCTION1 0xE0001038
 153  * DWT_COMP2     0xE0001040
 154  * DWT_MASK2     0xE0001044
 155  * DWT_FUNCTION2 0xE0001048
 156  * DWT_COMP3     0xE0001050
 157  * DWT_MASK3     0xE0001054
 158  * DWT_FUNCTION3 0xE0001058
 159  */
 160
 161 #define DATA_WATCH_NUM 4
 162
 163 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 164
 165 struct code_hw_watchpoint {
 166         stm32_addr_t addr;
 167         uint8_t mask;
 168         enum watchfun fun;
 169 };
 170
 171 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 172
 173 static void init_data_watchpoints(struct stlink *sl) {
 174         int i;
 175
 176         #ifdef DEBUG
 177         printf("init watchpoints\n");
 178         #endif
 179
 180         // set trcena in debug command to turn on dwt unit
 181         stlink_read_mem32(sl, 0xE000EDFC, 4);
 182         sl->q_buf[3] |= 1;
 183         stlink_write_mem32(sl, 0xE000EDFC, 4);
 184
 185         // make sure all watchpoints are cleared
 186         memset(sl->q_buf, 0, 4);
 187         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 188                 data_watches[i].fun = WATCHDISABLED;
 189                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 190         }
 191 }
 192
 193 static int add_data_watchpoint(struct stlink* sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 194 {
 195         int i = 0;
 196         uint32_t mask, temp;
 197
 198         // computer mask
 199         // find a free watchpoint
 200         // configure
 201
 202         mask = -1;
 203         i = len;
 204         while(i) {
 205                 i >>= 1;
 206                 mask++;
 207         }
 208
 209         if((mask != -1) && (mask < 16)) {
 210                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 211                         // is this an empty slot ?
 212                         if(data_watches[i].fun == WATCHDISABLED) {
 213                                 #ifdef DEBUG
 214                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 215                                 #endif
 216
 217                                 data_watches[i].fun = wf;
 218                                 data_watches[i].addr = addr;
 219                                 data_watches[i].mask = mask;
 220
 221                                 // insert comparator address
 222                                 sl->q_buf[0] = (addr & 0xff);
 223                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 224                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 225                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 226
 227                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 228
 229                                 // insert mask
 230                                 memset(sl->q_buf, 0, 4);
 231                                 sl->q_buf[0] = mask;
 232                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 233
 234                                 // insert function
 235                                 memset(sl->q_buf, 0, 4);
 236                                 sl->q_buf[0] = wf;
 237                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 238
 239                                 // just to make sure the matched bit is clear !
 240                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 241                                 return 0;
 242                         }
 243                 }
 244         }
 245
 246         #ifdef DEBUG
 247         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 248         #endif
 249         return -1;
 250 }
 251
 252 static int delete_data_watchpoint(struct stlink* sl, stm32_addr_t addr)
 253 {
 254         int i;
 255
 256         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 257                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 258                         #ifdef DEBUG
 259                         printf("delete watchpoint %d addr %x\n", i, addr);
 260                         #endif
 261
 262                         memset(sl->q_buf, 0, 4);
 263                         data_watches[i].fun = WATCHDISABLED;
 264                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 265
 266                         return 0;
 267                 }
 268         }
 269
 270         #ifdef DEBUG
 271         printf("failure: delete watchpoint addr %x\n", addr);
 272         #endif
 273
 274         return -1;
 275 }
 276
 277 #define CODE_BREAK_NUM  6
 278 #define CODE_BREAK_LOW  0x01
 279 #define CODE_BREAK_HIGH 0x02
 280
 281 struct code_hw_breakpoint {
 282         stm32_addr_t addr;
 283         int          type;
 284 };
 285
 286 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 287
 288 static void init_code_breakpoints(struct stlink* sl) {
 289         memset(sl->q_buf, 0, 4);
 290         sl->q_buf[0] = 0x03; // KEY | ENABLE
 291         stlink_write_mem32(sl, 0xe0002000, 4);
 292
 293         memset(sl->q_buf, 0, 4);
 294         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 295                 code_breaks[i].type = 0;
 296                 stlink_write_mem32(sl, 0xe0002008 + i * 4, 4);
 297         }
 298 }
 299
 300 static int update_code_breakpoint(struct stlink* sl, stm32_addr_t addr, int set) {
 301         stm32_addr_t fpb_addr = addr & ~0x3;
 302         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 303
 304         if(addr & 1) {
 305                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 306                 return -1;
 307         }
 308
 309         int id = -1;
 310         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 311                 if(fpb_addr == code_breaks[i].addr ||
 312                         (set && code_breaks[i].type == 0)) {
 313                         id = i;
 314                         break;
 315                 }
 316         }
 317
 318         if(id == -1) {
 319                 if(set) return -1; // Free slot not found
 320                 else    return 0;  // Breakpoint is already removed
 321         }
 322
 323         struct code_hw_breakpoint* brk = &code_breaks[id];
 324
 325         brk->addr = fpb_addr;
 326
 327         if(set) brk->type |= type;
 328         else    brk->type &= ~type;
 329
 330         memset(sl->q_buf, 0, 4);
 331
 332         if(brk->type == 0) {
 333                 #ifdef DEBUG
 334                 printf("clearing hw break %d\n", id);
 335                 #endif
 336
 337                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 338         } else {
 339                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 340                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 341                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 342                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 343
 344                 #ifdef DEBUG
 345                 printf("setting hw break %d at %08x (%d)\n",
 346                         id, brk->addr, brk->type);
 347                 printf("reg %02x %02x %02x %02x\n",
 348                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 349                 #endif
 350
 351                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 352         }
 353
 354         return 0;
 355 }
 356
 357
 358 struct flash_block {
 359         stm32_addr_t addr;
 360         unsigned     length;
 361         uint8_t*     data;
 362
 363         struct flash_block* next;
 364 };
 365
 366 static struct flash_block* flash_root;
 367
 368 static int flash_add_block(stm32_addr_t addr, unsigned length,
 369                            struct stlink* sl) {
 370         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 371                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 372                 return -1;
 373         }
 374
 375         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 376                 fprintf(stderr, "flash_add_block: unaligned block\n");
 377                 return -1;
 378         }
 379
 380         struct flash_block* new = malloc(sizeof(struct flash_block));
 381         new->next = flash_root;
 382
 383         new->addr   = addr;
 384         new->length = length;
 385         new->data   = calloc(length, 1);
 386
 387         flash_root = new;
 388
 389         return 0;
 390 }
 391
 392 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 393         int fit_blocks = 0, fit_length = 0;
 394
 395         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 396                 /* Block: ------X------Y--------
 397                  * Data:            a-----b
 398                  *                a--b
 399                  *            a-----------b
 400                  * Block intersects with data, if:
 401                  *  a < Y && b > x
 402                  */
 403
 404                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 405                 unsigned a = addr, b = addr + length;
 406                 if(a < Y && b > X) {
 407                         // from start of the block
 408                         unsigned start = (a > X ? a : X) - X;
 409                         unsigned end   = (b > Y ? Y : b) - X;
 410
 411                         memcpy(fb->data + start, data, end - start);
 412
 413                         fit_blocks++;
 414                         fit_length += end - start;
 415                 }
 416         }
 417
 418         if(fit_blocks == 0) {
 419                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 420                 return -1;
 421         }
 422
 423         if(fit_length != length) {
 424                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 425                         addr, length, fit_length);
 426                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int flash_go(struct stlink* sl) {
 433         int error = -1;
 434
 435         // Some kinds of clock settings do not allow writing to flash.
 436         stlink_reset(sl);
 437
 438         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 439                 #ifdef DEBUG
 440                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 441                 #endif
 442
 443                 unsigned length = fb->length;
 444                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 445                         #ifdef DEBUG
 446                         printf("flash_do: page %08x\n", page);
 447                         #endif
 448
 449                         stlink_erase_flash_page(sl, page);
 450
 451                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 452                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 453                                 goto error;
 454                 }
 455
 456         }
 457
 458         stlink_reset(sl);
 459
 460         error = 0;
 461
 462 error:
 463         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 464                 next = fb->next;
 465                 free(fb->data);
 466                 free(fb);
 467         }
 468
 469         flash_root = NULL;
 470
 471         return error;
 472 }
 473
 474 int serve(struct stlink* sl, int port) {
 475         int sock = socket(AF_INET, SOCK_STREAM, 0);
 476         if(sock < 0) {
 477                 perror("socket");
 478                 return 1;
 479         }
 480
 481         unsigned int val = 1;
 482         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 483
 484         struct sockaddr_in serv_addr = {0};
 485         serv_addr.sin_family = AF_INET;
 486         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 487         serv_addr.sin_port = htons(port);
 488
 489         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 490                 perror("bind");
 491                 return 1;
 492         }
 493
 494         if(listen(sock, 5) < 0) {
 495                 perror("listen");
 496                 return 1;
 497         }
 498
 499         stlink_force_debug(sl);
 500         stlink_reset(sl);
 501         init_code_breakpoints(sl);
 502         init_data_watchpoints(sl);
 503
 504         printf("Listening at *:%d...\n", port);
 505
 506         int client = accept(sock, NULL, NULL);
 507         if(client < 0) {
 508                 perror("accept");
 509                 return 1;
 510         }
 511
 512         close(sock);
 513
 514         printf("GDB connected.\n");
 515
 516         /*
 517          * To allow resetting the chip from GDB it is required to
 518          * emulate attaching and detaching to target.
 519          */
 520         unsigned int attached = 1;
 521
 522         while(1) {
 523                 char* packet;
 524
 525                 int status = gdb_recv_packet(client, &packet);
 526                 if(status < 0) {
 527                         fprintf(stderr, "cannot recv: %d\n", status);
 528                         return 1;
 529                 }
 530
 531                 #ifdef DEBUG
 532                 printf("recv: %s\n", packet);
 533                 #endif
 534
 535                 char* reply = NULL;
 536
 537                 switch(packet[0]) {
 538                 case 'q': {
 539                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 540                                 reply = strdup("");
 541                                 break;
 542                         }
 543
 544                         char *separator = strstr(packet, ":"), *params = "";
 545                         if(separator == NULL) {
 546                                 separator = packet + strlen(packet);
 547                         } else {
 548                                 params = separator + 1;
 549                         }
 550
 551                         unsigned queryNameLength = (separator - &packet[1]);
 552                         char* queryName = calloc(queryNameLength + 1, 1);
 553                         strncpy(queryName, &packet[1], queryNameLength);
 554
 555                         #ifdef DEBUG
 556                         printf("query: %s;%s\n", queryName, params);
 557                         #endif
 558
 559                         if(!strcmp(queryName, "Supported")) {
 560                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 561                         } else if(!strcmp(queryName, "Xfer")) {
 562                                 char *type, *op, *annex, *s_addr, *s_length;
 563                                 char *tok = params;
 564
 565                                 type     = strsep(&tok, ":");
 566                                 op       = strsep(&tok, ":");
 567                                 annex    = strsep(&tok, ":");
 568                                 s_addr   = strsep(&tok, ",");
 569                                 s_length = tok;
 570
 571                                 unsigned addr = strtoul(s_addr, NULL, 16),
 572                                        length = strtoul(s_length, NULL, 16);
 573
 574                                 #ifdef DEBUG
 575                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 576                                         type, op, annex, addr, length);
 577                                 #endif
 578
 579                                 const char* data = NULL;
 580
 581                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 582                                         data = current_memory_map;
 583
 584                                 if(data) {
 585                                         unsigned data_length = strlen(data);
 586                                         if(addr + length > data_length)
 587                                                 length = data_length - addr;
 588
 589                                         if(length == 0) {
 590                                                 reply = strdup("l");
 591                                         } else {
 592                                                 reply = calloc(length + 2, 1);
 593                                                 reply[0] = 'm';
 594                                                 strncpy(&reply[1], data, length);
 595                                         }
 596                                 }
 597                         }
 598
 599                         if(reply == NULL)
 600                                 reply = strdup("");
 601
 602                         free(queryName);
 603
 604                         break;
 605                 }
 606
 607                 case 'v': {
 608                         char *params = NULL;
 609                         char *cmdName = strtok_r(packet, ":;", &params);
 610
 611                         cmdName++; // vCommand -> Command
 612
 613                         if(!strcmp(cmdName, "FlashErase")) {
 614                                 char *s_addr, *s_length;
 615                                 char *tok = params;
 616
 617                                 s_addr   = strsep(&tok, ",");
 618                                 s_length = tok;
 619
 620                                 unsigned addr = strtoul(s_addr, NULL, 16),
 621                                        length = strtoul(s_length, NULL, 16);
 622
 623                                 #ifdef DEBUG
 624                                 printf("FlashErase: addr:%08x,len:%04x\n",
 625                                         addr, length);
 626                                 #endif
 627
 628                                 if(flash_add_block(addr, length, sl) < 0) {
 629                                         reply = strdup("E00");
 630                                 } else {
 631                                         reply = strdup("OK");
 632                                 }
 633                         } else if(!strcmp(cmdName, "FlashWrite")) {
 634                                 char *s_addr, *data;
 635                                 char *tok = params;
 636
 637                                 s_addr = strsep(&tok, ":");
 638                                 data   = tok;
 639
 640                                 unsigned addr = strtoul(s_addr, NULL, 16);
 641                                 unsigned data_length = status - (data - packet);
 642
 643                                 // Length of decoded data cannot be more than
 644                                 // encoded, as escapes are removed.
 645                                 // Additional byte is reserved for alignment fix.
 646                                 uint8_t *decoded = calloc(data_length + 1, 1);
 647                                 unsigned dec_index = 0;
 648                                 for(int i = 0; i < data_length; i++) {
 649                                         if(data[i] == 0x7d) {
 650                                                 i++;
 651                                                 decoded[dec_index++] = data[i] ^ 0x20;
 652                                         } else {
 653                                                 decoded[dec_index++] = data[i];
 654                                         }
 655                                 }
 656
 657                                 // Fix alignment
 658                                 if(dec_index % 2 != 0)
 659                                         dec_index++;
 660
 661                                 #ifdef DEBUG
 662                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 663                                 #endif
 664
 665                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 666                                         reply = strdup("E00");
 667                                 } else {
 668                                         reply = strdup("OK");
 669                                 }
 670                         } else if(!strcmp(cmdName, "FlashDone")) {
 671                                 if(flash_go(sl) < 0) {
 672                                         reply = strdup("E00");
 673                                 } else {
 674                                         reply = strdup("OK");
 675                                 }
 676                         } else if(!strcmp(cmdName, "Kill")) {
 677                                 attached = 0;
 678
 679                                 reply = strdup("OK");
 680                         }
 681
 682                         if(reply == NULL)
 683                                 reply = strdup("");
 684
 685                         break;
 686                 }
 687
 688                 case 'c':
 689                         stlink_run(sl);
 690
 691                         while(1) {
 692                                 int status = gdb_check_for_interrupt(client);
 693                                 if(status < 0) {
 694                                         fprintf(stderr, "cannot check for int: %d\n", status);
 695                                         return 1;
 696                                 }
 697
 698                                 if(status == 1) {
 699                                         stlink_force_debug(sl);
 700                                         break;
 701                                 }
 702
 703                                 stlink_status(sl);
 704                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 705                                         break;
 706                                 }
 707
 708                                 usleep(100000);
 709                         }
 710
 711                         reply = strdup("S05"); // TRAP
 712                         break;
 713
 714                 case 's':
 715                         stlink_step(sl);
 716
 717                         reply = strdup("S05"); // TRAP
 718                         break;
 719
 720                 case '?':
 721                         if(attached) {
 722                                 reply = strdup("S05"); // TRAP
 723                         } else {
 724                                 /* Stub shall reply OK if not attached. */
 725                                 reply = strdup("OK");
 726                         }
 727                         break;
 728
 729                 case 'g':
 730                         stlink_read_all_regs(sl);
 731
 732                         reply = calloc(8 * 16 + 1, 1);
 733                         for(int i = 0; i < 16; i++)
 734                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 735
 736                         break;
 737
 738                 case 'p': {
 739                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 740
 741                         if(id < 16) {
 742                                 stlink_read_reg(sl, id);
 743                                 reg = htonl(sl->reg.r[id]);
 744                         } else if(id == 0x19) {
 745                                 stlink_read_reg(sl, 16);
 746                                 reg = htonl(sl->reg.xpsr);
 747                         } else {
 748                                 reply = strdup("E00");
 749                         }
 750
 751                         reply = calloc(8 + 1, 1);
 752                         sprintf(reply, "%08x", reg);
 753
 754                         break;
 755                 }
 756
 757                 case 'P': {
 758                         char* s_reg = &packet[1];
 759                         char* s_value = strstr(&packet[1], "=") + 1;
 760
 761                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 762                         unsigned value = strtoul(s_value, NULL, 16);
 763
 764                         if(reg < 16) {
 765                                 stlink_write_reg(sl, ntohl(value), reg);
 766                         } else if(reg == 0x19) {
 767                                 stlink_write_reg(sl, ntohl(value), 16);
 768                         } else {
 769                                 reply = strdup("E00");
 770                         }
 771
 772                         if(!reply) {
 773                                 reply = strdup("OK");
 774                         }
 775
 776                         break;
 777                 }
 778
 779                 case 'G':
 780                         for(int i = 0; i < 16; i++) {
 781                                 char str[9] = {0};
 782                                 strncpy(str, &packet[1 + i * 8], 8);
 783                                 uint32_t reg = strtoul(str, NULL, 16);
 784                                 stlink_write_reg(sl, ntohl(reg), i);
 785                         }
 786
 787                         reply = strdup("OK");
 788                         break;
 789
 790                 case 'm': {
 791                         char* s_start = &packet[1];
 792                         char* s_count = strstr(&packet[1], ",") + 1;
 793
 794                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 795                         unsigned     count = strtoul(s_count, NULL, 16);
 796
 797                         unsigned adj_start = start % 4;
 798
 799                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 800                                                 count : count + 4 - (count % 4));
 801
 802                         reply = calloc(count * 2 + 1, 1);
 803                         for(int i = 0; i < count; i++) {
 804                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 805                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 806                         }
 807
 808                         break;
 809                 }
 810
 811                 case 'M': {
 812                         char* s_start = &packet[1];
 813                         char* s_count = strstr(&packet[1], ",") + 1;
 814                         char* hexdata = strstr(packet, ":") + 1;
 815
 816                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 817                         unsigned     count = strtoul(s_count, NULL, 16);
 818
 819                         for(int i = 0; i < count; i ++) {
 820                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 821                                 uint8_t byte = strtoul(hex, NULL, 16);
 822                                 sl->q_buf[i] = byte;
 823                         }
 824
 825                         if((count % 4) == 0 && (start % 4) == 0) {
 826                                 stlink_write_mem32(sl, start, count);
 827                         } else {
 828                                 stlink_write_mem8(sl, start, count);
 829                         }
 830
 831                         reply = strdup("OK");
 832
 833                         break;
 834                 }
 835
 836                 case 'Z': {
 837                         char *endptr;
 838                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 839                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 840
 841                         switch (packet[1]) {
 842                                 case '1':
 843                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 844                                         reply = strdup("E00");
 845                                 } else {
 846                                         reply = strdup("OK");
 847                                 }
 848                                 break;
 849
 850                                 case '2':   // insert write watchpoint
 851                                 case '3':   // insert read  watchpoint
 852                                 case '4':   // insert access watchpoint
 853                                 {
 854                                         enum watchfun wf;
 855                                         if(packet[1] == '2') {
 856                                                 wf = WATCHWRITE;
 857                                         } else if(packet[1] == '3') {
 858                                                 wf = WATCHREAD;
 859                                         } else {
 860                                                 wf = WATCHACCESS;
 861                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 862                                                         reply = strdup("E00");
 863                                                 } else {
 864                                                         reply = strdup("OK");
 865                                                         break;
 866                                                 }
 867                                         }
 868                                 }
 869
 870                                 default:
 871                                 reply = strdup("");
 872                         }
 873                         break;
 874                 }
 875                 case 'z': {
 876                         char *endptr;
 877                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 878                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 879
 880                         switch (packet[1]) {
 881                                 case '1': // remove breakpoint
 882                                 update_code_breakpoint(sl, addr, 0);
 883                                 reply = strdup("OK");
 884                                 break;
 885
 886                                 case '2' : // remove write watchpoint
 887                                 case '3' : // remove read watchpoint
 888                                 case '4' : // remove access watchpoint
 889                                 if(delete_data_watchpoint(sl, addr) < 0) {
 890                                         reply = strdup("E00");
 891                                 } else {
 892                                         reply = strdup("OK");
 893                                         break;
 894                                 }
 895
 896                                 default:
 897                                 reply = strdup("");
 898                         }
 899                         break;
 900                 }
 901
 902                 case '!': {
 903                         /*
 904                          * Enter extended mode which allows restarting.
 905                          * We do support that always.
 906                          */
 907
 908                         reply = strdup("OK");
 909
 910                         break;
 911                 }
 912
 913                 case 'R': {
 914                         /* Reset the core. */
 915
 916                         stlink_reset(sl);
 917                         init_code_breakpoints(sl);
 918                         init_data_watchpoints(sl);
 919
 920                         attached = 1;
 921
 922                         reply = strdup("OK");
 923
 924                         break;
 925                 }
 926
 927                 default:
 928                         reply = strdup("");
 929                 }
 930
 931                 if(reply) {
 932                         #ifdef DEBUG
 933                         printf("send: %s\n", reply);
 934                         #endif
 935
 936                         int result = gdb_send_packet(client, reply);
 937                         if(result != 0) {
 938                                 fprintf(stderr, "cannot send: %d\n", result);
 939                                 return 1;
 940                         }
 941
 942                         free(reply);
 943                 }
 944
 945                 free(packet);
 946         }
 947
 948         return 0;
 949 }