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   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
  25 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  26 #define FLASH_PAGE (sl->flash_pgsz)
  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           /*Page size is variable */
  53         { 0x413, "F4 device", 0x1FFF7A10,                                               //RM0090 error same as unique ID
  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(stlink_t *sl, 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         uint32_t flash_size;
  80
  81         const char * HelpStr =  "\nUsage:\n"
  82                                  "\tst-util [Arguments]\n"
  83                                  "\tArguments (no more than 2):\n"
  84                                   "\t\t<Port>: Port. Default: 4242.\n"
  85                                   "\t\t{usb|sgauto|/dev/sgX}: Transport, "
  86                                    "where X = {0, 1, 2, ...}. Default: USB.\n"
  87                                  "\tExamples:\n"
  88                                   "\t\tst-util 1234\n"
  89                                   "\t\tst-util sgauto\n"
  90                                   "\t\tst-util 1234 usb\n"
  91                                   "\t\tst-util /dev/sgX 1234\n"
  92                                   "\t\tst-util 1234 /dev/sgX\n";
  93
  94
  95         // Parsing the arguments of command line ...
  96
  97         if (argc == 1 || argc > 3) {
  98             fprintf(stderr, HelpStr, NULL);
  99             return 1;
 100         }
 101
 102         for(int a = 1; a < argc; a++) {
 103
 104             // Port
 105             int p = atoi(argv[a]);
 106             if (p < 0 || p > 0xFFFF) {
 107                 fprintf(stderr, "Invalid port\n");
 108                 fprintf(stderr, HelpStr, NULL);
 109                 return 1;
 110             }
 111             if (p > 0 && port == 0) {port = p; continue;}
 112
 113             // if (p == 0) ...
 114
 115             if (sl != NULL) {
 116                 fprintf(stderr, "Invalid argumets\n");
 117                 fprintf(stderr, HelpStr, NULL);
 118                 return 1;
 119             }
 120
 121             // usb
 122             if (!strcmp(argv[a], "usb")) {
 123                 sl = stlink_open_usb(10);
 124                 if(sl == NULL) return 1;
 125                 continue;
 126             }
 127
 128             // /dev/sgX
 129             if (!strncmp(argv[a], "/dev/sgX", 7)) {
 130                 if(!CONFIG_USE_LIBSG) {
 131                     fprintf(stderr, "libsg not use\n");
 132                     return 1;
 133                 }
 134                 sl = stlink_quirk_open(argv[a], 0);
 135                 if(sl == NULL) return 1;
 136                 continue;
 137             }
 138
 139             // sg_auto
 140             if (!strcmp(argv[a], "sgauto")) {
 141                 if(!CONFIG_USE_LIBSG) {
 142                     fprintf(stderr, "libsg not use\n");
 143                     return 1;
 144                 }
 145
 146                 // Search ST-LINK (from /dev/sg0 to /dev/sg99)
 147                 for(int DevNum = 0; DevNum <= 99; DevNum++)
 148                 {
 149                     if(DevNum < 10) {
 150                         char DevName[] = "/dev/sgX";
 151                         DevName[7] = DevNum + '0';
 152                         if ( !access(DevName, F_OK) )
 153                             sl = stlink_quirk_open(DevName, 0);
 154                     }
 155                     else {
 156                         char DevName[] = "/dev/sgXY";
 157                         DevName[7] = DevNum/10 + '0';
 158                         DevName[8] = DevNum%10 + '0';
 159                         if ( !access(DevName, F_OK) )
 160                             sl = stlink_quirk_open(DevName, 0);
 161                     }
 162                     if (sl != NULL) break;
 163                 }
 164
 165                 if(sl == NULL) return 1;
 166                 continue;
 167             }
 168
 169             // Invalid argumets
 170             fprintf(stderr, "Invalid argumets\n");
 171             fprintf(stderr, HelpStr, NULL);
 172             return 1;
 173         }
 174
 175         // Default transport: USB
 176         if (sl == NULL) sl = stlink_open_usb(10);
 177         // Default port: 4242
 178         if (port == 0) port = 4242;
 179
 180         // End parsing
 181
 182
 183         if (sl == NULL) return 1;
 184
 185         if (stlink_current_mode(sl) == STLINK_DEV_DFU_MODE) {
 186                 stlink_exit_dfu_mode(sl);
 187         }
 188
 189         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE) {
 190           stlink_enter_swd_mode(sl);
 191         }
 192
 193         stlink_identify_device(sl);
 194         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 195
 196         sl->verbose=0;
 197
 198         const struct chip_params* params = NULL;
 199
 200         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
 201                 if(devices[i].chip_id == (sl->chip_id & 0xFFF)) {
 202                         params = &devices[i];
 203                         break;
 204                 }
 205         }
 206
 207         if(params == NULL) {
 208                 fprintf(stderr, "Cannot recognize the connected device!\n");
 209                 return 0;
 210         }
 211
 212         printf("Device connected: %s\n", params->description);
 213
 214         if(sl->chip_id==STM32F4_CHIP_ID) {
 215                 flash_size=0x100000;                    //todo: RM0090 error; size register same address as unique ID
 216                 printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes with variable page size\n",
 217                         params->sram_size, flash_size);
 218         }
 219         else {
 220                 printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 221                         params->sram_size, params->max_flash_size, params->flash_pagesize);
 222                 stlink_read_mem32(sl, params->flash_size_reg, 4);
 223                 flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 224                 //flash_size_reg is in 1k blocks.
 225                 flash_size *= 0x400;
 226         }
 227
 228         /* Init PAGE_SIZE for fixed page size devices.
 229          * stlink_calculate_pagesize will then return this value for them.
 230          * variable pagesize devices must allways update FLASH_PAGE before use! */
 231         FLASH_PAGE = params->flash_pagesize;
 232         sl->flash_size=flash_size;
 233
 234         printf("Flash size is %d\n", flash_size);
 235         current_memory_map = make_memory_map(sl, params, flash_size);
 236
 237         while(serve(sl, port) == 0);
 238
 239         /* Switch back to mass storage mode before closing. */
 240         stlink_run(sl);
 241         stlink_exit_debug_mode(sl);
 242         stlink_close(sl);
 243
 244         return 0;
 245 }
 246
 247 static const char* const memory_map_template_F4 =
 248   "<?xml version=\"1.0\"?>"
 249   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 250   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 251   "<memory-map>"
 252   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 253   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x30000\"/>"        // sram
 254   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 255   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 256   "  </memory>"
 257   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 258   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 259   "  </memory>"
 260   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 261   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 262   "  </memory>"
 263   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 264   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 265   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 266   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 267   "</memory-map>";
 268
 269 static const char* const memory_map_template =
 270   "<?xml version=\"1.0\"?>"
 271   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 272   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 273   "<memory-map>"
 274   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 275   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 276   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 277   "    <property name=\"blocksize\">0x%x</property>"
 278   "  </memory>"
 279   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 280   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 281   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 282   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 283   "</memory-map>";
 284
 285 char* make_memory_map(stlink_t *sl, const struct chip_params *params, uint32_t flash_size) {
 286         /* This will be freed in serve() */
 287         char* map = malloc(4096);
 288         map[0] = '\0';
 289
 290         if(sl->chip_id==STM32F4_CHIP_ID) {
 291         strcpy(map, memory_map_template_F4);
 292     }
 293
 294     else {
 295         snprintf(map, 4096, memory_map_template,
 296                         flash_size,
 297                         params->sram_size,
 298                         flash_size, params->flash_pagesize,
 299                         params->bootrom_base, params->bootrom_size);
 300     }
 301         return map;
 302 }
 303
 304
 305 /*
 306  * DWT_COMP0     0xE0001020
 307  * DWT_MASK0     0xE0001024
 308  * DWT_FUNCTION0 0xE0001028
 309  * DWT_COMP1     0xE0001030
 310  * DWT_MASK1     0xE0001034
 311  * DWT_FUNCTION1 0xE0001038
 312  * DWT_COMP2     0xE0001040
 313  * DWT_MASK2     0xE0001044
 314  * DWT_FUNCTION2 0xE0001048
 315  * DWT_COMP3     0xE0001050
 316  * DWT_MASK3     0xE0001054
 317  * DWT_FUNCTION3 0xE0001058
 318  */
 319
 320 #define DATA_WATCH_NUM 4
 321
 322 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 323
 324 struct code_hw_watchpoint {
 325         stm32_addr_t addr;
 326         uint8_t mask;
 327         enum watchfun fun;
 328 };
 329
 330 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 331
 332 static void init_data_watchpoints(stlink_t *sl) {
 333         #ifdef DEBUG
 334         printf("init watchpoints\n");
 335         #endif
 336
 337         // set trcena in debug command to turn on dwt unit
 338         stlink_read_mem32(sl, 0xE000EDFC, 4);
 339         sl->q_buf[3] |= 1;
 340         stlink_write_mem32(sl, 0xE000EDFC, 4);
 341
 342         // make sure all watchpoints are cleared
 343         memset(sl->q_buf, 0, 4);
 344         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 345                 data_watches[i].fun = WATCHDISABLED;
 346                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 347         }
 348 }
 349
 350 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 351 {
 352         int i = 0;
 353         uint32_t mask;
 354
 355         // computer mask
 356         // find a free watchpoint
 357         // configure
 358
 359         mask = -1;
 360         i = len;
 361         while(i) {
 362                 i >>= 1;
 363                 mask++;
 364         }
 365
 366         if((mask != -1) && (mask < 16)) {
 367                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 368                         // is this an empty slot ?
 369                         if(data_watches[i].fun == WATCHDISABLED) {
 370                                 #ifdef DEBUG
 371                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 372                                 #endif
 373
 374                                 data_watches[i].fun = wf;
 375                                 data_watches[i].addr = addr;
 376                                 data_watches[i].mask = mask;
 377
 378                                 // insert comparator address
 379                                 sl->q_buf[0] = (addr & 0xff);
 380                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 381                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 382                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 383
 384                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 385
 386                                 // insert mask
 387                                 memset(sl->q_buf, 0, 4);
 388                                 sl->q_buf[0] = mask;
 389                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 390
 391                                 // insert function
 392                                 memset(sl->q_buf, 0, 4);
 393                                 sl->q_buf[0] = wf;
 394                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 395
 396                                 // just to make sure the matched bit is clear !
 397                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 398                                 return 0;
 399                         }
 400                 }
 401         }
 402
 403         #ifdef DEBUG
 404         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 405         #endif
 406         return -1;
 407 }
 408
 409 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 410 {
 411         int i;
 412
 413         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 414                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 415                         #ifdef DEBUG
 416                         printf("delete watchpoint %d addr %x\n", i, addr);
 417                         #endif
 418
 419                         memset(sl->q_buf, 0, 4);
 420                         data_watches[i].fun = WATCHDISABLED;
 421                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 422
 423                         return 0;
 424                 }
 425         }
 426
 427         #ifdef DEBUG
 428         printf("failure: delete watchpoint addr %x\n", addr);
 429         #endif
 430
 431         return -1;
 432 }
 433
 434 #define CODE_BREAK_NUM  6
 435 #define CODE_BREAK_LOW  0x01
 436 #define CODE_BREAK_HIGH 0x02
 437
 438 struct code_hw_breakpoint {
 439         stm32_addr_t addr;
 440         int          type;
 441 };
 442
 443 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 444
 445 static void init_code_breakpoints(stlink_t *sl) {
 446         memset(sl->q_buf, 0, 4);
 447         sl->q_buf[0] = 0x03; // KEY | ENABLE
 448         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 449         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 450         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 451
 452         memset(sl->q_buf, 0, 4);
 453         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 454                 code_breaks[i].type = 0;
 455                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 456         }
 457 }
 458
 459 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 460         stm32_addr_t fpb_addr = addr & ~0x3;
 461         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 462
 463         if(addr & 1) {
 464                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 465                 return -1;
 466         }
 467
 468         int id = -1;
 469         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 470                 if(fpb_addr == code_breaks[i].addr ||
 471                         (set && code_breaks[i].type == 0)) {
 472                         id = i;
 473                         break;
 474                 }
 475         }
 476
 477         if(id == -1) {
 478                 if(set) return -1; // Free slot not found
 479                 else    return 0;  // Breakpoint is already removed
 480         }
 481
 482         struct code_hw_breakpoint* brk = &code_breaks[id];
 483
 484         brk->addr = fpb_addr;
 485
 486         if(set) brk->type |= type;
 487         else    brk->type &= ~type;
 488
 489         memset(sl->q_buf, 0, 4);
 490
 491         if(brk->type == 0) {
 492                 #ifdef DEBUG
 493                 printf("clearing hw break %d\n", id);
 494                 #endif
 495
 496                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 497         } else {
 498                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 499                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 500                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 501                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 502
 503                 #ifdef DEBUG
 504                 printf("setting hw break %d at %08x (%d)\n",
 505                         id, brk->addr, brk->type);
 506                 printf("reg %02x %02x %02x %02x\n",
 507                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 508                 #endif
 509
 510                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 511         }
 512
 513         return 0;
 514 }
 515
 516
 517 struct flash_block {
 518         stm32_addr_t addr;
 519         unsigned     length;
 520         uint8_t*     data;
 521
 522         struct flash_block* next;
 523 };
 524
 525 static struct flash_block* flash_root;
 526
 527 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 528
 529         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 530                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 531                 return -1;
 532         }
 533
 534         stlink_calculate_pagesize(sl, addr);
 535         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 536                 fprintf(stderr, "flash_add_block: unaligned block\n");
 537                 return -1;
 538         }
 539
 540         struct flash_block* new = malloc(sizeof(struct flash_block));
 541         new->next = flash_root;
 542
 543         new->addr   = addr;
 544         new->length = length;
 545         new->data   = calloc(length, 1);
 546
 547         flash_root = new;
 548
 549         return 0;
 550 }
 551
 552 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 553         int fit_blocks = 0, fit_length = 0;
 554
 555         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 556                 /* Block: ------X------Y--------
 557                  * Data:            a-----b
 558                  *                a--b
 559                  *            a-----------b
 560                  * Block intersects with data, if:
 561                  *  a < Y && b > x
 562                  */
 563
 564                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 565                 unsigned a = addr, b = addr + length;
 566                 if(a < Y && b > X) {
 567                         // from start of the block
 568                         unsigned start = (a > X ? a : X) - X;
 569                         unsigned end   = (b > Y ? Y : b) - X;
 570
 571                         memcpy(fb->data + start, data, end - start);
 572
 573                         fit_blocks++;
 574                         fit_length += end - start;
 575                 }
 576         }
 577
 578         if(fit_blocks == 0) {
 579                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 580                 return -1;
 581         }
 582
 583         if(fit_length != length) {
 584                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 585                         addr, length, fit_length);
 586                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 587         }
 588
 589         return 0;
 590 }
 591
 592 static int flash_go(stlink_t *sl) {
 593         int error = -1;
 594
 595         // Some kinds of clock settings do not allow writing to flash.
 596         stlink_reset(sl);
 597
 598         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 599                 #ifdef DEBUG
 600                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 601                 #endif
 602
 603                 unsigned length = fb->length;
 604                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 605
 606                         //Update FLASH_PAGE
 607                         stlink_calculate_pagesize(sl, page);
 608
 609                         #ifdef DEBUG
 610                         printf("flash_do: page %08x\n", page);
 611                         #endif
 612
 613                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 614                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 615                                 goto error;
 616                         }
 617         }
 618
 619         stlink_reset(sl);
 620
 621         error = 0;
 622
 623 error:
 624         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 625                 next = fb->next;
 626                 free(fb->data);
 627                 free(fb);
 628         }
 629
 630         flash_root = NULL;
 631
 632         return error;
 633 }
 634
 635 int serve(stlink_t *sl, int port) {
 636         int sock = socket(AF_INET, SOCK_STREAM, 0);
 637         if(sock < 0) {
 638                 perror("socket");
 639                 return 1;
 640         }
 641
 642         unsigned int val = 1;
 643         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 644
 645         struct sockaddr_in serv_addr = {0};
 646         serv_addr.sin_family = AF_INET;
 647         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 648         serv_addr.sin_port = htons(port);
 649
 650         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 651                 perror("bind");
 652                 return 1;
 653         }
 654
 655         if(listen(sock, 5) < 0) {
 656                 perror("listen");
 657                 return 1;
 658         }
 659
 660         stlink_force_debug(sl);
 661         stlink_reset(sl);
 662         init_code_breakpoints(sl);
 663         init_data_watchpoints(sl);
 664
 665         printf("Listening at *:%d...\n", port);
 666
 667         (void) signal (SIGINT, ctrl_c);
 668         int client = accept(sock, NULL, NULL);
 669         signal (SIGINT, SIG_DFL);
 670         if(client < 0) {
 671                 perror("accept");
 672                 return 1;
 673         }
 674
 675         close(sock);
 676
 677         printf("GDB connected.\n");
 678
 679         /*
 680          * To allow resetting the chip from GDB it is required to
 681          * emulate attaching and detaching to target.
 682          */
 683         unsigned int attached = 1;
 684
 685         while(1) {
 686                 char* packet;
 687
 688                 int status = gdb_recv_packet(client, &packet);
 689                 if(status < 0) {
 690                         fprintf(stderr, "cannot recv: %d\n", status);
 691                         return 1;
 692                 }
 693
 694                 #ifdef DEBUG
 695                 printf("recv: %s\n", packet);
 696                 #endif
 697
 698                 char* reply = NULL;
 699                 reg regp;
 700
 701                 switch(packet[0]) {
 702                 case 'q': {
 703                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 704                                 reply = strdup("");
 705                                 break;
 706                         }
 707
 708                         char *separator = strstr(packet, ":"), *params = "";
 709                         if(separator == NULL) {
 710                                 separator = packet + strlen(packet);
 711                         } else {
 712                                 params = separator + 1;
 713                         }
 714
 715                         unsigned queryNameLength = (separator - &packet[1]);
 716                         char* queryName = calloc(queryNameLength + 1, 1);
 717                         strncpy(queryName, &packet[1], queryNameLength);
 718
 719                         #ifdef DEBUG
 720                         printf("query: %s;%s\n", queryName, params);
 721                         #endif
 722
 723                         if(!strcmp(queryName, "Supported")) {
 724                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 725                         } else if(!strcmp(queryName, "Xfer")) {
 726                                 char *type, *op, *s_addr, *s_length;
 727                                 char *tok = params;
 728                                 char *annex __attribute__((unused));
 729
 730                                 type     = strsep(&tok, ":");
 731                                 op       = strsep(&tok, ":");
 732                                 annex    = strsep(&tok, ":");
 733                                 s_addr   = strsep(&tok, ",");
 734                                 s_length = tok;
 735
 736                                 unsigned addr = strtoul(s_addr, NULL, 16),
 737                                        length = strtoul(s_length, NULL, 16);
 738
 739                                 #ifdef DEBUG
 740                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 741                                         type, op, annex, addr, length);
 742                                 #endif
 743
 744                                 const char* data = NULL;
 745
 746                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 747                                         data = current_memory_map;
 748
 749                                 if(data) {
 750                                         unsigned data_length = strlen(data);
 751                                         if(addr + length > data_length)
 752                                                 length = data_length - addr;
 753
 754                                         if(length == 0) {
 755                                                 reply = strdup("l");
 756                                         } else {
 757                                                 reply = calloc(length + 2, 1);
 758                                                 reply[0] = 'm';
 759                                                 strncpy(&reply[1], data, length);
 760                                         }
 761                                 }
 762                         }
 763
 764                         if(reply == NULL)
 765                                 reply = strdup("");
 766
 767                         free(queryName);
 768
 769                         break;
 770                 }
 771
 772                 case 'v': {
 773                         char *params = NULL;
 774                         char *cmdName = strtok_r(packet, ":;", &params);
 775
 776                         cmdName++; // vCommand -> Command
 777
 778                         if(!strcmp(cmdName, "FlashErase")) {
 779                                 char *s_addr, *s_length;
 780                                 char *tok = params;
 781
 782                                 s_addr   = strsep(&tok, ",");
 783                                 s_length = tok;
 784
 785                                 unsigned addr = strtoul(s_addr, NULL, 16),
 786                                        length = strtoul(s_length, NULL, 16);
 787
 788                                 #ifdef DEBUG
 789                                 printf("FlashErase: addr:%08x,len:%04x\n",
 790                                         addr, length);
 791                                 #endif
 792
 793                                 if(flash_add_block(addr, length, sl) < 0) {
 794                                         reply = strdup("E00");
 795                                 } else {
 796                                         reply = strdup("OK");
 797                                 }
 798                         } else if(!strcmp(cmdName, "FlashWrite")) {
 799                                 char *s_addr, *data;
 800                                 char *tok = params;
 801
 802                                 s_addr = strsep(&tok, ":");
 803                                 data   = tok;
 804
 805                                 unsigned addr = strtoul(s_addr, NULL, 16);
 806                                 unsigned data_length = status - (data - packet);
 807
 808                                 // Length of decoded data cannot be more than
 809                                 // encoded, as escapes are removed.
 810                                 // Additional byte is reserved for alignment fix.
 811                                 uint8_t *decoded = calloc(data_length + 1, 1);
 812                                 unsigned dec_index = 0;
 813                                 for(int i = 0; i < data_length; i++) {
 814                                         if(data[i] == 0x7d) {
 815                                                 i++;
 816                                                 decoded[dec_index++] = data[i] ^ 0x20;
 817                                         } else {
 818                                                 decoded[dec_index++] = data[i];
 819                                         }
 820                                 }
 821
 822                                 // Fix alignment
 823                                 if(dec_index % 2 != 0)
 824                                         dec_index++;
 825
 826                                 #ifdef DEBUG
 827                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 828                                 #endif
 829
 830                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 831                                         reply = strdup("E00");
 832                                 } else {
 833                                         reply = strdup("OK");
 834                                 }
 835                         } else if(!strcmp(cmdName, "FlashDone")) {
 836                                 if(flash_go(sl) < 0) {
 837                                         reply = strdup("E00");
 838                                 } else {
 839                                         reply = strdup("OK");
 840                                 }
 841                         } else if(!strcmp(cmdName, "Kill")) {
 842                                 attached = 0;
 843
 844                                 reply = strdup("OK");
 845                         }
 846
 847                         if(reply == NULL)
 848                                 reply = strdup("");
 849
 850                         break;
 851                 }
 852
 853                 case 'c':
 854                         stlink_run(sl);
 855
 856                         while(1) {
 857                                 int status = gdb_check_for_interrupt(client);
 858                                 if(status < 0) {
 859                                         fprintf(stderr, "cannot check for int: %d\n", status);
 860                                         return 1;
 861                                 }
 862
 863                                 if(status == 1) {
 864                                         stlink_force_debug(sl);
 865                                         break;
 866                                 }
 867
 868                                 stlink_status(sl);
 869                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 870                                         break;
 871                                 }
 872
 873                                 usleep(100000);
 874                         }
 875
 876                         reply = strdup("S05"); // TRAP
 877                         break;
 878
 879                 case 's':
 880                         stlink_step(sl);
 881
 882                         reply = strdup("S05"); // TRAP
 883                         break;
 884
 885                 case '?':
 886                         if(attached) {
 887                                 reply = strdup("S05"); // TRAP
 888                         } else {
 889                                 /* Stub shall reply OK if not attached. */
 890                                 reply = strdup("OK");
 891                         }
 892                         break;
 893
 894                 case 'g':
 895                         stlink_read_all_regs(sl, &regp);
 896
 897                         reply = calloc(8 * 16 + 1, 1);
 898                         for(int i = 0; i < 16; i++)
 899                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 900
 901                         break;
 902
 903                 case 'p': {
 904                         unsigned id = strtoul(&packet[1], NULL, 16);
 905                         unsigned myreg = 0xDEADDEAD;
 906
 907                         if(id < 16) {
 908                                 stlink_read_reg(sl, id, &regp);
 909                                 myreg = htonl(regp.r[id]);
 910                         } else if(id == 0x19) {
 911                                 stlink_read_reg(sl, 16, &regp);
 912                                 myreg = htonl(regp.xpsr);
 913                         } else {
 914                                 reply = strdup("E00");
 915                         }
 916
 917                         reply = calloc(8 + 1, 1);
 918                         sprintf(reply, "%08x", myreg);
 919
 920                         break;
 921                 }
 922
 923                 case 'P': {
 924                         char* s_reg = &packet[1];
 925                         char* s_value = strstr(&packet[1], "=") + 1;
 926
 927                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 928                         unsigned value = strtoul(s_value, NULL, 16);
 929
 930                         if(reg < 16) {
 931                                 stlink_write_reg(sl, ntohl(value), reg);
 932                         } else if(reg == 0x19) {
 933                                 stlink_write_reg(sl, ntohl(value), 16);
 934                         } else {
 935                                 reply = strdup("E00");
 936                         }
 937
 938                         if(!reply) {
 939                                 reply = strdup("OK");
 940                         }
 941
 942                         break;
 943                 }
 944
 945                 case 'G':
 946                         for(int i = 0; i < 16; i++) {
 947                                 char str[9] = {0};
 948                                 strncpy(str, &packet[1 + i * 8], 8);
 949                                 uint32_t reg = strtoul(str, NULL, 16);
 950                                 stlink_write_reg(sl, ntohl(reg), i);
 951                         }
 952
 953                         reply = strdup("OK");
 954                         break;
 955
 956                 case 'm': {
 957                         char* s_start = &packet[1];
 958                         char* s_count = strstr(&packet[1], ",") + 1;
 959
 960                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 961                         unsigned     count = strtoul(s_count, NULL, 16);
 962
 963                         unsigned adj_start = start % 4;
 964
 965                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 966                                                 count : count + 4 - (count % 4));
 967
 968                         reply = calloc(count * 2 + 1, 1);
 969                         for(int i = 0; i < count; i++) {
 970                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 971                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 972                         }
 973
 974                         break;
 975                 }
 976
 977                 case 'M': {
 978                         char* s_start = &packet[1];
 979                         char* s_count = strstr(&packet[1], ",") + 1;
 980                         char* hexdata = strstr(packet, ":") + 1;
 981
 982                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 983                         unsigned     count = strtoul(s_count, NULL, 16);
 984
 985                         for(int i = 0; i < count; i ++) {
 986                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 987                                 uint8_t byte = strtoul(hex, NULL, 16);
 988                                 sl->q_buf[i] = byte;
 989                         }
 990
 991                         if((count % 4) == 0 && (start % 4) == 0) {
 992                                 stlink_write_mem32(sl, start, count);
 993                         } else {
 994                                 stlink_write_mem8(sl, start, count);
 995                         }
 996
 997                         reply = strdup("OK");
 998
 999                         break;
1000                 }
1001
1002                 case 'Z': {
1003                         char *endptr;
1004                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1005                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1006
1007                         switch (packet[1]) {
1008                                 case '1':
1009                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1010                                         reply = strdup("E00");
1011                                 } else {
1012                                         reply = strdup("OK");
1013                                 }
1014                                 break;
1015
1016                                 case '2':   // insert write watchpoint
1017                                 case '3':   // insert read  watchpoint
1018                                 case '4':   // insert access watchpoint
1019                                 {
1020                                         enum watchfun wf;
1021                                         if(packet[1] == '2') {
1022                                                 wf = WATCHWRITE;
1023                                         } else if(packet[1] == '3') {
1024                                                 wf = WATCHREAD;
1025                                         } else {
1026                                                 wf = WATCHACCESS;
1027                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1028                                                         reply = strdup("E00");
1029                                                 } else {
1030                                                         reply = strdup("OK");
1031                                                         break;
1032                                                 }
1033                                         }
1034                                 }
1035
1036                                 default:
1037                                 reply = strdup("");
1038                         }
1039                         break;
1040                 }
1041                 case 'z': {
1042                         char *endptr;
1043                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1044                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1045
1046                         switch (packet[1]) {
1047                                 case '1': // remove breakpoint
1048                                 update_code_breakpoint(sl, addr, 0);
1049                                 reply = strdup("OK");
1050                                 break;
1051
1052                                 case '2' : // remove write watchpoint
1053                                 case '3' : // remove read watchpoint
1054                                 case '4' : // remove access watchpoint
1055                                 if(delete_data_watchpoint(sl, addr) < 0) {
1056                                         reply = strdup("E00");
1057                                 } else {
1058                                         reply = strdup("OK");
1059                                         break;
1060                                 }
1061
1062                                 default:
1063                                 reply = strdup("");
1064                         }
1065                         break;
1066                 }
1067
1068                 case '!': {
1069                         /*
1070                          * Enter extended mode which allows restarting.
1071                          * We do support that always.
1072                          */
1073
1074                         reply = strdup("OK");
1075
1076                         break;
1077                 }
1078
1079                 case 'R': {
1080                         /* Reset the core. */
1081
1082                         stlink_reset(sl);
1083                         init_code_breakpoints(sl);
1084                         init_data_watchpoints(sl);
1085
1086                         attached = 1;
1087
1088                         reply = strdup("OK");
1089
1090                         break;
1091                 }
1092
1093                 default:
1094                         reply = strdup("");
1095                 }
1096
1097                 if(reply) {
1098                         #ifdef DEBUG
1099                         printf("send: %s\n", reply);
1100                         #endif
1101
1102                         int result = gdb_send_packet(client, reply);
1103                         if(result != 0) {
1104                                 fprintf(stderr, "cannot send: %d\n", result);
1105                                 return 1;
1106                         }
1107
1108                         free(reply);
1109                 }
1110
1111                 free(packet);
1112         }
1113
1114         return 0;
1115 }