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 <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #ifdef __MINGW32__
  16 #include "mingw.h"
  17 #else
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <signal.h>
  22 #endif
  23
  24 #include <stlink-common.h>
  25
  26 #include "gdb-remote.h"
  27
  28 #define DEFAULT_LOGGING_LEVEL 50
  29 #define DEFAULT_GDB_LISTEN_PORT 4242
  30
  31 #define STRINGIFY_inner(name) #name
  32 #define STRINGIFY(name) STRINGIFY_inner(name)
  33
  34 #define FLASH_BASE 0x08000000
  35
  36 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  37 #define FLASH_PAGE (sl->flash_pgsz)
  38
  39 static const char hex[] = "0123456789abcdef";
  40
  41 static const char* current_memory_map = NULL;
  42
  43 typedef struct _st_state_t {
  44     // things from command line, bleh
  45     int stlink_version;
  46     // "/dev/serial/by-id/usb-FTDI_TTL232R-3V3_FTE531X6-if00-port0" is only 58 chars
  47     char devicename[100];
  48     int logging_level;
  49         int listen_port;
  50 } st_state_t;
  51
  52
  53 int serve(stlink_t *sl, int port);
  54 char* make_memory_map(stlink_t *sl);
  55
  56
  57 int parse_options(int argc, char** argv, st_state_t *st) {
  58     static struct option long_options[] = {
  59         {"help", no_argument, NULL, 'h'},
  60         {"verbose", optional_argument, NULL, 'v'},
  61         {"device", required_argument, NULL, 'd'},
  62         {"stlink_version", required_argument, NULL, 's'},
  63         {"stlinkv1", no_argument, NULL, '1'},
  64                 {"listen_port", required_argument, NULL, 'p'},
  65         {0, 0, 0, 0},
  66     };
  67         const char * help_str = "%s - usage:\n\n"
  68         "  -h, --help\t\tPrint this help\n"
  69         "  -vXX, --verbose=XX\tspecify a specific verbosity level (0..99)\n"
  70         "  -v, --verbose\tspecify generally verbose logging\n"
  71         "  -d <device>, --device=/dev/stlink2_1\n"
  72         "\t\t\tWhere is your stlink device connected?\n"
  73         "  -s X, --stlink_version=X\n"
  74         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  75         "  -1, --stlinkv1\tForce stlink version 1\n"
  76         "  -p 4242, --listen_port=1234\n"
  77         "\t\t\tSet the gdb server listen port. "
  78         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  79         ;
  80
  81
  82     int option_index = 0;
  83     int c;
  84     int q;
  85     while ((c = getopt_long(argc, argv, "hv::d:s:1p:", long_options, &option_index)) != -1) {
  86         switch (c) {
  87         case 0:
  88             printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
  89             printf("option %s", long_options[option_index].name);
  90             if (optarg) {
  91                 printf(" with arg %s", optarg);
  92             }
  93             printf("\n");
  94             break;
  95         case 'h':
  96             printf(help_str, argv[0]);
  97             exit(EXIT_SUCCESS);
  98             break;
  99         case 'v':
 100             if (optarg) {
 101                 st->logging_level = atoi(optarg);
 102             } else {
 103                 st->logging_level = DEFAULT_LOGGING_LEVEL;
 104             }
 105             break;
 106         case 'd':
 107             if (strlen(optarg) > sizeof (st->devicename)) {
 108                 fprintf(stderr, "device name too long: %zd\n", strlen(optarg));
 109             } else {
 110                 strcpy(st->devicename, optarg);
 111             }
 112             break;
 113                 case '1':
 114                         st->stlink_version = 1;
 115                         break;
 116                 case 's':
 117                         sscanf(optarg, "%i", &q);
 118                         if (q < 0 || q > 2) {
 119                                 fprintf(stderr, "stlink version %d unknown!\n", q);
 120                                 exit(EXIT_FAILURE);
 121                         }
 122                         st->stlink_version = q;
 123                         break;
 124                 case 'p':
 125                         sscanf(optarg, "%i", &q);
 126                         if (q < 0) {
 127                                 fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 128                                 exit(EXIT_FAILURE);
 129                         }
 130                         st->listen_port = q;
 131                         break;
 132         }
 133     }
 134
 135     if (optind < argc) {
 136         printf("non-option ARGV-elements: ");
 137         while (optind < argc)
 138             printf("%s ", argv[optind++]);
 139         printf("\n");
 140     }
 141     return 0;
 142 }
 143
 144
 145 int main(int argc, char** argv) {
 146
 147         stlink_t *sl = NULL;
 148
 149         st_state_t state;
 150         memset(&state, 0, sizeof(state));
 151         // set defaults...
 152         state.stlink_version = 2;
 153         state.logging_level = DEFAULT_LOGGING_LEVEL;
 154         state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 155         parse_options(argc, argv, &state);
 156         switch (state.stlink_version) {
 157         case 2:
 158                 sl = stlink_open_usb(state.logging_level);
 159                 if(sl == NULL) return 1;
 160                 break;
 161         case 1:
 162                 sl = stlink_v1_open(state.logging_level);
 163                 if(sl == NULL) return 1;
 164                 break;
 165     }
 166
 167         printf("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 168
 169         sl->verbose=0;
 170
 171         current_memory_map = make_memory_map(sl);
 172
 173 #ifdef __MINGW32__
 174         WSADATA wsadata;
 175         if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 176                 goto winsock_error;
 177         }
 178 #endif
 179
 180         while(serve(sl, state.listen_port) == 0);
 181
 182 #ifdef __MINGW32__
 183 winsock_error:
 184         WSACleanup();
 185 #endif
 186
 187         /* Switch back to mass storage mode before closing. */
 188         stlink_run(sl);
 189         stlink_exit_debug_mode(sl);
 190         stlink_close(sl);
 191
 192         return 0;
 193 }
 194
 195 static const char* const target_description_F4 =
 196     "<?xml version=\"1.0\"?>"
 197     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 198     "<target version=\"1.0\">"
 199     "   <architecture>arm</architecture>"
 200     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 201     "       <reg name=\"r0\" bitsize=\"32\"/>"
 202     "       <reg name=\"r1\" bitsize=\"32\"/>"
 203     "       <reg name=\"r2\" bitsize=\"32\"/>"
 204     "       <reg name=\"r3\" bitsize=\"32\"/>"
 205     "       <reg name=\"r4\" bitsize=\"32\"/>"
 206     "       <reg name=\"r5\" bitsize=\"32\"/>"
 207     "       <reg name=\"r6\" bitsize=\"32\"/>"
 208     "       <reg name=\"r7\" bitsize=\"32\"/>"
 209     "       <reg name=\"r8\" bitsize=\"32\"/>"
 210     "       <reg name=\"r9\" bitsize=\"32\"/>"
 211     "       <reg name=\"r10\" bitsize=\"32\"/>"
 212     "       <reg name=\"r11\" bitsize=\"32\"/>"
 213     "       <reg name=\"r12\" bitsize=\"32\"/>"
 214     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 215     "       <reg name=\"lr\" bitsize=\"32\"/>"
 216     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 217     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 218     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 219     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 220     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 221     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 222     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 223     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 224     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 225     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 226     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 227     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 228     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 229     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 230     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 231     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 232     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 233     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 234     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 235     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 236     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 237     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 238     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 239     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 240     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 241     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 242     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 243     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 244     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 245     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 246     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 247     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 248     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 249     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 250     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 251     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 252     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 253     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 254     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 255     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 256     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 257     "   </feature>"
 258     "</target>";
 259
 260 static const char* const memory_map_template_F4 =
 261   "<?xml version=\"1.0\"?>"
 262   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 263   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 264   "<memory-map>"
 265   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"       // code = sram, bootrom or flash; flash is bigger
 266   "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"        // ccm ram
 267   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"        // sram
 268   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"           //Sectors 0..3
 269   "    <property name=\"blocksize\">0x4000</property>"                                          //16kB
 270   "  </memory>"
 271   "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"           //Sector 4
 272   "    <property name=\"blocksize\">0x10000</property>"                                         //64kB
 273   "  </memory>"
 274   "  <memory type=\"flash\" start=\"0x08020000\" length=\"0x70000\">"           //Sectors 5..11
 275   "    <property name=\"blocksize\">0x20000</property>"                                         //128kB
 276   "  </memory>"
 277   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"         // peripheral regs
 278   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"         // cortex regs
 279   "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"         // bootrom
 280   "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"               // option byte area
 281   "</memory-map>";
 282
 283 static const char* const memory_map_template =
 284   "<?xml version=\"1.0\"?>"
 285   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 286   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 287   "<memory-map>"
 288   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"       // code = sram, bootrom or flash; flash is bigger
 289   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"       // sram 8k
 290   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 291   "    <property name=\"blocksize\">0x%zx</property>"
 292   "  </memory>"
 293   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 294   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 295   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"           // bootrom
 296   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"        // option byte area
 297   "</memory-map>";
 298
 299 char* make_memory_map(stlink_t *sl) {
 300         /* This will be freed in serve() */
 301         char* map = malloc(4096);
 302         map[0] = '\0';
 303
 304         if(sl->chip_id==STM32_CHIPID_F4) {
 305         strcpy(map, memory_map_template_F4);
 306     } else {
 307         snprintf(map, 4096, memory_map_template,
 308                         sl->flash_size,
 309                         sl->sram_size,
 310                         sl->flash_size, sl->flash_pgsz,
 311                         sl->sys_base, sl->sys_size);
 312     }
 313         return map;
 314 }
 315
 316
 317 /*
 318  * DWT_COMP0     0xE0001020
 319  * DWT_MASK0     0xE0001024
 320  * DWT_FUNCTION0 0xE0001028
 321  * DWT_COMP1     0xE0001030
 322  * DWT_MASK1     0xE0001034
 323  * DWT_FUNCTION1 0xE0001038
 324  * DWT_COMP2     0xE0001040
 325  * DWT_MASK2     0xE0001044
 326  * DWT_FUNCTION2 0xE0001048
 327  * DWT_COMP3     0xE0001050
 328  * DWT_MASK3     0xE0001054
 329  * DWT_FUNCTION3 0xE0001058
 330  */
 331
 332 #define DATA_WATCH_NUM 4
 333
 334 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 335
 336 struct code_hw_watchpoint {
 337         stm32_addr_t addr;
 338         uint8_t mask;
 339         enum watchfun fun;
 340 };
 341
 342 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 343
 344 static void init_data_watchpoints(stlink_t *sl) {
 345         #ifdef DEBUG
 346         printf("init watchpoints\n");
 347         #endif
 348
 349         // set trcena in debug command to turn on dwt unit
 350         stlink_write_debug32(sl, 0xE000EDFC,
 351                              stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 352
 353         // make sure all watchpoints are cleared
 354         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 355                 data_watches[i].fun = WATCHDISABLED;
 356                 stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 357         }
 358 }
 359
 360 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 361 {
 362         int i = 0;
 363         uint32_t mask;
 364
 365         // computer mask
 366         // find a free watchpoint
 367         // configure
 368
 369         mask = -1;
 370         i = len;
 371         while(i) {
 372                 i >>= 1;
 373                 mask++;
 374         }
 375
 376         if((mask != (uint32_t)-1) && (mask < 16)) {
 377                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 378                         // is this an empty slot ?
 379                         if(data_watches[i].fun == WATCHDISABLED) {
 380                                 #ifdef DEBUG
 381                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 382                                 #endif
 383
 384                                 data_watches[i].fun = wf;
 385                                 data_watches[i].addr = addr;
 386                                 data_watches[i].mask = mask;
 387
 388                                 // insert comparator address
 389                                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 390
 391                                 // insert mask
 392                                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 393
 394                                 // insert function
 395                                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 396
 397                                 // just to make sure the matched bit is clear !
 398                                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 399                                 return 0;
 400                         }
 401                 }
 402         }
 403
 404         #ifdef DEBUG
 405         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 406         #endif
 407         return -1;
 408 }
 409
 410 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 411 {
 412         int i;
 413
 414         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 415                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 416                         #ifdef DEBUG
 417                         printf("delete watchpoint %d addr %x\n", i, addr);
 418                         #endif
 419
 420                         data_watches[i].fun = WATCHDISABLED;
 421                         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 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         stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 448         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 449         stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 450
 451         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 452                 code_breaks[i].type = 0;
 453                 stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 454         }
 455 }
 456
 457 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 458         stm32_addr_t fpb_addr = addr & ~0x3;
 459         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 460
 461         if(addr & 1) {
 462                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 463                 return -1;
 464         }
 465
 466         int id = -1;
 467         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 468                 if(fpb_addr == code_breaks[i].addr ||
 469                         (set && code_breaks[i].type == 0)) {
 470                         id = i;
 471                         break;
 472                 }
 473         }
 474
 475         if(id == -1) {
 476                 if(set) return -1; // Free slot not found
 477                 else    return 0;  // Breakpoint is already removed
 478         }
 479
 480         struct code_hw_breakpoint* brk = &code_breaks[id];
 481
 482         brk->addr = fpb_addr;
 483
 484         if(set) brk->type |= type;
 485         else    brk->type &= ~type;
 486
 487         if(brk->type == 0) {
 488                 #ifdef DEBUG
 489                 printf("clearing hw break %d\n", id);
 490                 #endif
 491
 492                 stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 493         } else {
 494                 uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 495
 496                 #ifdef DEBUG
 497                 printf("setting hw break %d at %08x (%d)\n",
 498                         id, brk->addr, brk->type);
 499                 printf("reg %08x \n",
 500                         mask);
 501                 #endif
 502
 503                 stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 504         }
 505
 506         return 0;
 507 }
 508
 509
 510 struct flash_block {
 511         stm32_addr_t addr;
 512         unsigned     length;
 513         uint8_t*     data;
 514
 515         struct flash_block* next;
 516 };
 517
 518 static struct flash_block* flash_root;
 519
 520 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 521
 522         if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 523                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 524                 return -1;
 525         }
 526
 527         stlink_calculate_pagesize(sl, addr);
 528         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 529                 fprintf(stderr, "flash_add_block: unaligned block\n");
 530                 return -1;
 531         }
 532
 533         struct flash_block* new = malloc(sizeof(struct flash_block));
 534         new->next = flash_root;
 535
 536         new->addr   = addr;
 537         new->length = length;
 538         new->data   = calloc(length, 1);
 539
 540         flash_root = new;
 541
 542         return 0;
 543 }
 544
 545 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 546         unsigned int fit_blocks = 0, fit_length = 0;
 547
 548         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 549                 /* Block: ------X------Y--------
 550                  * Data:            a-----b
 551                  *                a--b
 552                  *            a-----------b
 553                  * Block intersects with data, if:
 554                  *  a < Y && b > x
 555                  */
 556
 557                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 558                 unsigned a = addr, b = addr + length;
 559                 if(a < Y && b > X) {
 560                         // from start of the block
 561                         unsigned start = (a > X ? a : X) - X;
 562                         unsigned end   = (b > Y ? Y : b) - X;
 563
 564                         memcpy(fb->data + start, data, end - start);
 565
 566                         fit_blocks++;
 567                         fit_length += end - start;
 568                 }
 569         }
 570
 571         if(fit_blocks == 0) {
 572                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 573                 return -1;
 574         }
 575
 576         if(fit_length != length) {
 577                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 578                         addr, length, fit_length);
 579                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 580         }
 581
 582         return 0;
 583 }
 584
 585 static int flash_go(stlink_t *sl) {
 586         int error = -1;
 587
 588         // Some kinds of clock settings do not allow writing to flash.
 589         stlink_reset(sl);
 590
 591         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 592                 #ifdef DEBUG
 593                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 594                 #endif
 595
 596                 unsigned length = fb->length;
 597                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 598
 599                         //Update FLASH_PAGE
 600                         stlink_calculate_pagesize(sl, page);
 601
 602                         #ifdef DEBUG
 603                         printf("flash_do: page %08x\n", page);
 604                         #endif
 605
 606                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 607                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 608                                 goto error;
 609                         }
 610         }
 611
 612         stlink_reset(sl);
 613
 614         error = 0;
 615
 616 error:
 617         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 618                 next = fb->next;
 619                 free(fb->data);
 620                 free(fb);
 621         }
 622
 623         flash_root = NULL;
 624
 625         return error;
 626 }
 627
 628 int serve(stlink_t *sl, int port) {
 629         int sock = socket(AF_INET, SOCK_STREAM, 0);
 630         if(sock < 0) {
 631                 perror("socket");
 632                 return 1;
 633         }
 634
 635         unsigned int val = 1;
 636         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 637
 638         struct sockaddr_in serv_addr;
 639         memset(&serv_addr,0,sizeof(struct sockaddr_in));
 640         serv_addr.sin_family = AF_INET;
 641         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 642         serv_addr.sin_port = htons(port);
 643
 644         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 645                 perror("bind");
 646                 return 1;
 647         }
 648
 649         if(listen(sock, 5) < 0) {
 650                 perror("listen");
 651                 return 1;
 652         }
 653
 654         stlink_force_debug(sl);
 655         stlink_reset(sl);
 656         init_code_breakpoints(sl);
 657         init_data_watchpoints(sl);
 658
 659         printf("Listening at *:%d...\n", port);
 660
 661         int client = accept(sock, NULL, NULL);
 662         //signal (SIGINT, SIG_DFL);
 663         if(client < 0) {
 664                 perror("accept");
 665                 return 1;
 666         }
 667
 668         close(sock);
 669
 670         printf("GDB connected.\n");
 671
 672         /*
 673          * To allow resetting the chip from GDB it is required to
 674          * emulate attaching and detaching to target.
 675          */
 676         unsigned int attached = 1;
 677
 678         while(1) {
 679                 char* packet;
 680
 681                 int status = gdb_recv_packet(client, &packet);
 682                 if(status < 0) {
 683                         fprintf(stderr, "cannot recv: %d\n", status);
 684                         return 1;
 685                 }
 686
 687                 #ifdef DEBUG
 688                 printf("recv: %s\n", packet);
 689                 #endif
 690
 691                 char* reply = NULL;
 692                 reg regp;
 693
 694                 switch(packet[0]) {
 695                 case 'q': {
 696                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 697                                 reply = strdup("");
 698                                 break;
 699                         }
 700
 701                         char *separator = strstr(packet, ":"), *params = "";
 702                         if(separator == NULL) {
 703                                 separator = packet + strlen(packet);
 704                         } else {
 705                                 params = separator + 1;
 706                         }
 707
 708                         unsigned queryNameLength = (separator - &packet[1]);
 709                         char* queryName = calloc(queryNameLength + 1, 1);
 710                         strncpy(queryName, &packet[1], queryNameLength);
 711
 712                         #ifdef DEBUG
 713                         printf("query: %s;%s\n", queryName, params);
 714                         #endif
 715
 716                         if(!strcmp(queryName, "Supported")) {
 717                 if(sl->chip_id==STM32_CHIPID_F4) {
 718                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 719                 }
 720                 else {
 721                     reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 722                 }
 723                         } else if(!strcmp(queryName, "Xfer")) {
 724                                 char *type, *op, *__s_addr, *s_length;
 725                                 char *tok = params;
 726                                 char *annex __attribute__((unused));
 727
 728                                 type     = strsep(&tok, ":");
 729                                 op       = strsep(&tok, ":");
 730                                 annex    = strsep(&tok, ":");
 731                                 __s_addr   = strsep(&tok, ",");
 732                                 s_length = tok;
 733
 734                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 735                                        length = strtoul(s_length, NULL, 16);
 736
 737                                 #ifdef DEBUG
 738                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 739                                         type, op, annex, addr, length);
 740                                 #endif
 741
 742                                 const char* data = NULL;
 743
 744                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 745                                         data = current_memory_map;
 746
 747                                 if(!strcmp(type, "features") && !strcmp(op, "read"))
 748                                         data = target_description_F4;
 749
 750                                 if(data) {
 751                                         unsigned data_length = strlen(data);
 752                                         if(addr + length > data_length)
 753                                                 length = data_length - addr;
 754
 755                                         if(length == 0) {
 756                                                 reply = strdup("l");
 757                                         } else {
 758                                                 reply = calloc(length + 2, 1);
 759                                                 reply[0] = 'm';
 760                                                 strncpy(&reply[1], data, length);
 761                                         }
 762                                 }
 763                         } else if(!strncmp(queryName, "Rcmd,",4)) {
 764                                 // Rcmd uses the wrong separator
 765                                 char *separator = strstr(packet, ","), *params = "";
 766                                 if(separator == NULL) {
 767                                         separator = packet + strlen(packet);
 768                                 } else {
 769                                         params = separator + 1;
 770                                 }
 771
 772
 773                                 if (!strncmp(params,"726573756d65",12)) {// resume
 774 #ifdef DEBUG
 775                                         printf("Rcmd: resume\n");
 776 #endif
 777                                         stlink_run(sl);
 778
 779                                         reply = strdup("OK");
 780                 } else if (!strncmp(params,"68616c74",8)) { //halt
 781                                         reply = strdup("OK");
 782
 783                                         stlink_force_debug(sl);
 784
 785 #ifdef DEBUG
 786                                         printf("Rcmd: halt\n");
 787 #endif
 788                 } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 789                                         reply = strdup("OK");
 790
 791                                         stlink_jtag_reset(sl, 1);
 792                                         stlink_jtag_reset(sl, 0);
 793                                         stlink_force_debug(sl);
 794
 795 #ifdef DEBUG
 796                                         printf("Rcmd: jtag_reset\n");
 797 #endif
 798                 } else if (!strncmp(params,"7265736574",10)) { //reset
 799                                         reply = strdup("OK");
 800
 801                                         stlink_force_debug(sl);
 802                                         stlink_reset(sl);
 803                                         init_code_breakpoints(sl);
 804                                         init_data_watchpoints(sl);
 805
 806 #ifdef DEBUG
 807                                         printf("Rcmd: reset\n");
 808 #endif
 809                                 } else {
 810 #ifdef DEBUG
 811                                         printf("Rcmd: %s\n", params);
 812 #endif
 813
 814                                 }
 815
 816                         }
 817
 818                         if(reply == NULL)
 819                                 reply = strdup("");
 820
 821                         free(queryName);
 822
 823                         break;
 824                 }
 825
 826                 case 'v': {
 827                         char *params = NULL;
 828                         char *cmdName = strtok_r(packet, ":;", &params);
 829
 830                         cmdName++; // vCommand -> Command
 831
 832                         if(!strcmp(cmdName, "FlashErase")) {
 833                                 char *__s_addr, *s_length;
 834                                 char *tok = params;
 835
 836                                 __s_addr   = strsep(&tok, ",");
 837                                 s_length = tok;
 838
 839                                 unsigned addr = strtoul(__s_addr, NULL, 16),
 840                                        length = strtoul(s_length, NULL, 16);
 841
 842                                 #ifdef DEBUG
 843                                 printf("FlashErase: addr:%08x,len:%04x\n",
 844                                         addr, length);
 845                                 #endif
 846
 847                                 if(flash_add_block(addr, length, sl) < 0) {
 848                                         reply = strdup("E00");
 849                                 } else {
 850                                         reply = strdup("OK");
 851                                 }
 852                         } else if(!strcmp(cmdName, "FlashWrite")) {
 853                                 char *__s_addr, *data;
 854                                 char *tok = params;
 855
 856                                 __s_addr = strsep(&tok, ":");
 857                                 data   = tok;
 858
 859                                 unsigned addr = strtoul(__s_addr, NULL, 16);
 860                                 unsigned data_length = status - (data - packet);
 861
 862                                 // Length of decoded data cannot be more than
 863                                 // encoded, as escapes are removed.
 864                                 // Additional byte is reserved for alignment fix.
 865                                 uint8_t *decoded = calloc(data_length + 1, 1);
 866                                 unsigned dec_index = 0;
 867                                 for(unsigned int i = 0; i < data_length; i++) {
 868                                         if(data[i] == 0x7d) {
 869                                                 i++;
 870                                                 decoded[dec_index++] = data[i] ^ 0x20;
 871                                         } else {
 872                                                 decoded[dec_index++] = data[i];
 873                                         }
 874                                 }
 875
 876                                 // Fix alignment
 877                                 if(dec_index % 2 != 0)
 878                                         dec_index++;
 879
 880                                 #ifdef DEBUG
 881                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 882                                 #endif
 883
 884                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 885                                         reply = strdup("E00");
 886                                 } else {
 887                                         reply = strdup("OK");
 888                                 }
 889                         } else if(!strcmp(cmdName, "FlashDone")) {
 890                                 if(flash_go(sl) < 0) {
 891                                         reply = strdup("E00");
 892                                 } else {
 893                                         reply = strdup("OK");
 894                                 }
 895                         } else if(!strcmp(cmdName, "Kill")) {
 896                                 attached = 0;
 897
 898                                 reply = strdup("OK");
 899                         }
 900
 901                         if(reply == NULL)
 902                                 reply = strdup("");
 903
 904                         break;
 905                 }
 906
 907                 case 'c':
 908                         stlink_run(sl);
 909
 910                         while(1) {
 911                                 int status = gdb_check_for_interrupt(client);
 912                                 if(status < 0) {
 913                                         fprintf(stderr, "cannot check for int: %d\n", status);
 914                                         return 1;
 915                                 }
 916
 917                                 if(status == 1) {
 918                                         stlink_force_debug(sl);
 919                                         break;
 920                                 }
 921
 922                                 stlink_status(sl);
 923                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 924                                         break;
 925                                 }
 926
 927                                 usleep(100000);
 928                         }
 929
 930                         reply = strdup("S05"); // TRAP
 931                         break;
 932
 933                 case 's':
 934                         stlink_step(sl);
 935
 936                         reply = strdup("S05"); // TRAP
 937                         break;
 938
 939                 case '?':
 940                         if(attached) {
 941                                 reply = strdup("S05"); // TRAP
 942                         } else {
 943                                 /* Stub shall reply OK if not attached. */
 944                                 reply = strdup("OK");
 945                         }
 946                         break;
 947
 948                 case 'g':
 949                         stlink_read_all_regs(sl, &regp);
 950
 951                         reply = calloc(8 * 16 + 1, 1);
 952                         for(int i = 0; i < 16; i++)
 953                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 954
 955                         break;
 956
 957                 case 'p': {
 958                         unsigned id = strtoul(&packet[1], NULL, 16);
 959                         unsigned myreg = 0xDEADDEAD;
 960
 961                         if(id < 16) {
 962                                 stlink_read_reg(sl, id, &regp);
 963                                 myreg = htonl(regp.r[id]);
 964                         } else if(id == 0x19) {
 965                                 stlink_read_reg(sl, 16, &regp);
 966                                 myreg = htonl(regp.xpsr);
 967                         } else if(id == 0x1A) {
 968                                 stlink_read_reg(sl, 17, &regp);
 969                                 myreg = htonl(regp.main_sp);
 970                         } else if(id == 0x1B) {
 971                                 stlink_read_reg(sl, 18, &regp);
 972                                 myreg = htonl(regp.process_sp);
 973                         } else if(id == 0x1C) {
 974                                 stlink_read_unsupported_reg(sl, id, &regp);
 975                                 myreg = htonl(regp.control);
 976                         } else if(id == 0x1D) {
 977                                 stlink_read_unsupported_reg(sl, id, &regp);
 978                                 myreg = htonl(regp.faultmask);
 979                         } else if(id == 0x1E) {
 980                                 stlink_read_unsupported_reg(sl, id, &regp);
 981                                 myreg = htonl(regp.basepri);
 982                         } else if(id == 0x1F) {
 983                                 stlink_read_unsupported_reg(sl, id, &regp);
 984                                 myreg = htonl(regp.primask);
 985             } else if(id >= 0x20 && id < 0x40) {
 986                 stlink_read_unsupported_reg(sl, id, &regp);
 987                 myreg = htonl(regp.s[id-0x20]);
 988                         } else if(id == 0x40) {
 989                 stlink_read_unsupported_reg(sl, id, &regp);
 990                 myreg = htonl(regp.fpscr);
 991                         } else {
 992                                 reply = strdup("E00");
 993                         }
 994
 995                         reply = calloc(8 + 1, 1);
 996                         sprintf(reply, "%08x", myreg);
 997
 998                         break;
 999                 }
1000
1001                 case 'P': {
1002                         char* s_reg = &packet[1];
1003                         char* s_value = strstr(&packet[1], "=") + 1;
1004
1005                         unsigned reg   = strtoul(s_reg,   NULL, 16);
1006                         unsigned value = strtoul(s_value, NULL, 16);
1007
1008                         if(reg < 16) {
1009                                 stlink_write_reg(sl, ntohl(value), reg);
1010                         } else if(reg == 0x19) {
1011                                 stlink_write_reg(sl, ntohl(value), 16);
1012                         } else if(reg == 0x1A) {
1013                                 stlink_write_reg(sl, ntohl(value), 17);
1014                         } else if(reg == 0x1B) {
1015                                 stlink_write_reg(sl, ntohl(value), 18);
1016                         } else if(reg == 0x1C) {
1017                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1018                         } else if(reg == 0x1D) {
1019                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1020                         } else if(reg == 0x1E) {
1021                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1022                         } else if(reg == 0x1F) {
1023                                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1024             } else if(reg >= 0x20 && reg < 0x40) {
1025                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1026                         } else if(reg == 0x40) {
1027                 stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1028                         } else {
1029                                 reply = strdup("E00");
1030                         }
1031
1032                         if(!reply) {
1033                                 reply = strdup("OK");
1034                         }
1035
1036                         break;
1037                 }
1038
1039                 case 'G':
1040                         for(int i = 0; i < 16; i++) {
1041                                 char str[9] = {0};
1042                                 strncpy(str, &packet[1 + i * 8], 8);
1043                                 uint32_t reg = strtoul(str, NULL, 16);
1044                                 stlink_write_reg(sl, ntohl(reg), i);
1045                         }
1046
1047                         reply = strdup("OK");
1048                         break;
1049
1050                 case 'm': {
1051                         char* s_start = &packet[1];
1052                         char* s_count = strstr(&packet[1], ",") + 1;
1053
1054                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1055                         unsigned     count = strtoul(s_count, NULL, 16);
1056
1057                         unsigned adj_start = start % 4;
1058
1059                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
1060                                                 count : count + 4 - (count % 4));
1061
1062                         reply = calloc(count * 2 + 1, 1);
1063                         for(unsigned int i = 0; i < count; i++) {
1064                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1065                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1066                         }
1067
1068                         break;
1069                 }
1070
1071                 case 'M': {
1072                         char* s_start = &packet[1];
1073                         char* s_count = strstr(&packet[1], ",") + 1;
1074                         char* hexdata = strstr(packet, ":") + 1;
1075
1076                         stm32_addr_t start = strtoul(s_start, NULL, 16);
1077                         unsigned     count = strtoul(s_count, NULL, 16);
1078
1079                         if(start % 4) {
1080                           unsigned align_count = 4 - start % 4;
1081                           if (align_count > count) align_count = count;
1082                           for(unsigned int i = 0; i < align_count; i ++) {
1083                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1084                                 uint8_t byte = strtoul(hex, NULL, 16);
1085                                 sl->q_buf[i] = byte;
1086                           }
1087                           stlink_write_mem8(sl, start, align_count);
1088                           start += align_count;
1089                           count -= align_count;
1090                           hexdata += 2*align_count;
1091                         }
1092
1093                         if(count - count % 4) {
1094                           unsigned aligned_count = count - count % 4;
1095
1096                           for(unsigned int i = 0; i < aligned_count; i ++) {
1097                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1098                             uint8_t byte = strtoul(hex, NULL, 16);
1099                             sl->q_buf[i] = byte;
1100                           }
1101                           stlink_write_mem32(sl, start, aligned_count);
1102                           count -= aligned_count;
1103                           start += aligned_count;
1104                           hexdata += 2*aligned_count;
1105                         }
1106
1107                         if(count) {
1108                           for(unsigned int i = 0; i < count; i ++) {
1109                             char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1110                             uint8_t byte = strtoul(hex, NULL, 16);
1111                             sl->q_buf[i] = byte;
1112                           }
1113                           stlink_write_mem8(sl, start, count);
1114                         }
1115                         reply = strdup("OK");
1116                         break;
1117                 }
1118
1119                 case 'Z': {
1120                         char *endptr;
1121                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1122                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1123
1124                         switch (packet[1]) {
1125                                 case '1':
1126                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
1127                                         reply = strdup("E00");
1128                                 } else {
1129                                         reply = strdup("OK");
1130                                 }
1131                                 break;
1132
1133                                 case '2':   // insert write watchpoint
1134                                 case '3':   // insert read  watchpoint
1135                                 case '4':   // insert access watchpoint
1136                                 {
1137                                         enum watchfun wf;
1138                                         if(packet[1] == '2') {
1139                                                 wf = WATCHWRITE;
1140                                         } else if(packet[1] == '3') {
1141                                                 wf = WATCHREAD;
1142                                         } else {
1143                                                 wf = WATCHACCESS;
1144                                         }
1145
1146                     if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1147                         reply = strdup("E00");
1148                     } else {
1149                         reply = strdup("OK");
1150                         break;
1151                     }
1152                                 }
1153
1154                                 default:
1155                                 reply = strdup("");
1156                         }
1157                         break;
1158                 }
1159                 case 'z': {
1160                         char *endptr;
1161                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1162                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1163
1164                         switch (packet[1]) {
1165                                 case '1': // remove breakpoint
1166                                 update_code_breakpoint(sl, addr, 0);
1167                                 reply = strdup("OK");
1168                                 break;
1169
1170                                 case '2' : // remove write watchpoint
1171                                 case '3' : // remove read watchpoint
1172                                 case '4' : // remove access watchpoint
1173                                 if(delete_data_watchpoint(sl, addr) < 0) {
1174                                         reply = strdup("E00");
1175                                 } else {
1176                                         reply = strdup("OK");
1177                                         break;
1178                                 }
1179
1180                                 default:
1181                                 reply = strdup("");
1182                         }
1183                         break;
1184                 }
1185
1186                 case '!': {
1187                         /*
1188                          * Enter extended mode which allows restarting.
1189                          * We do support that always.
1190                          */
1191
1192                         reply = strdup("OK");
1193
1194                         break;
1195                 }
1196
1197                 case 'R': {
1198                         /* Reset the core. */
1199
1200                         stlink_reset(sl);
1201                         init_code_breakpoints(sl);
1202                         init_data_watchpoints(sl);
1203
1204                         attached = 1;
1205
1206                         reply = strdup("OK");
1207
1208                         break;
1209                 }
1210
1211                 default:
1212                         reply = strdup("");
1213                 }
1214
1215                 if(reply) {
1216                         #ifdef DEBUG
1217                         printf("send: %s\n", reply);
1218                         #endif
1219
1220                         int result = gdb_send_packet(client, reply);
1221                         if(result != 0) {
1222                                 fprintf(stderr, "cannot send: %d\n", result);
1223                                 return 1;
1224                         }
1225
1226                         free(reply);
1227                 }
1228
1229                 free(packet);
1230         }
1231
1232         return 0;
1233 }