git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

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