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

   1 /*
   2  * Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   3  * Use of this source code is governed by a BSD-style
   4  * license that can be found in the LICENSE file.
   5  */
   6
   7 #include <getopt.h>
   8 #include <signal.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <signal.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 #endif
  22
  23 #include <stlink-common.h>
  24 #include <uglylogging.h>
  25
  26 #include "gdb-remote.h"
  27 #include "gdb-server.h"
  28
  29 #define FLASH_BASE 0x08000000
  30
  31 //Allways update the FLASH_PAGE before each use, by calling stlink_calculate_pagesize
  32 #define FLASH_PAGE (sl->flash_pgsz)
  33
  34 stlink_t *connected_stlink = NULL;
  35
  36 static const char hex[] = "0123456789abcdef";
  37
  38 static const char* current_memory_map = NULL;
  39
  40 typedef struct _st_state_t {
  41     // things from command line, bleh
  42     int stlink_version;
  43     int logging_level;
  44     int listen_port;
  45     int persistent;
  46     int reset;
  47 } st_state_t;
  48
  49
  50 int serve(stlink_t *sl, st_state_t *st);
  51 char* make_memory_map(stlink_t *sl);
  52
  53 static void cleanup(int signal __attribute__((unused))) {
  54     if (connected_stlink) {
  55         /* Switch back to mass storage mode before closing. */
  56         stlink_run(connected_stlink);
  57         stlink_exit_debug_mode(connected_stlink);
  58         stlink_close(connected_stlink);
  59     }
  60
  61     exit(1);
  62 }
  63
  64
  65
  66 int parse_options(int argc, char** argv, st_state_t *st) {
  67     static struct option long_options[] = {
  68         {"help", no_argument, NULL, 'h'},
  69         {"verbose", optional_argument, NULL, 'v'},
  70         {"stlink_version", required_argument, NULL, 's'},
  71         {"stlinkv1", no_argument, NULL, '1'},
  72         {"listen_port", required_argument, NULL, 'p'},
  73         {"multi", optional_argument, NULL, 'm'},
  74         {"no-reset", optional_argument, NULL, 'n'},
  75         {0, 0, 0, 0},
  76     };
  77     const char * help_str = "%s - usage:\n\n"
  78         "  -h, --help\t\tPrint this help\n"
  79         "  -vXX, --verbose=XX\tSpecify a specific verbosity level (0..99)\n"
  80         "  -v, --verbose\t\tSpecify generally verbose logging\n"
  81         "  -s X, --stlink_version=X\n"
  82         "\t\t\tChoose what version of stlink to use, (defaults to 2)\n"
  83         "  -1, --stlinkv1\tForce stlink version 1\n"
  84         "  -p 4242, --listen_port=1234\n"
  85         "\t\t\tSet the gdb server listen port. "
  86         "(default port: " STRINGIFY(DEFAULT_GDB_LISTEN_PORT) ")\n"
  87         "  -m, --multi\n"
  88         "\t\t\tSet gdb server to extended mode.\n"
  89         "\t\t\tst-util will continue listening for connections after disconnect.\n"
  90         "  -n, --no-reset\n"
  91         "\t\t\tDo not reset board on connection.\n"
  92         "\n"
  93         "The STLINKv2 device to use can be specified in the environment\n"
  94         "variable STLINK_DEVICE on the format <USB_BUS>:<USB_ADDR>.\n"
  95         "\n"
  96         ;
  97
  98
  99     int option_index = 0;
 100     int c;
 101     int q;
 102     while ((c = getopt_long(argc, argv, "hv::s:1p:mn", long_options, &option_index)) != -1) {
 103         switch (c) {
 104             case 0:
 105                 printf("XXXXX Shouldn't really normally come here, only if there's no corresponding option\n");
 106                 printf("option %s", long_options[option_index].name);
 107                 if (optarg) {
 108                     printf(" with arg %s", optarg);
 109                 }
 110                 printf("\n");
 111                 break;
 112             case 'h':
 113                 printf(help_str, argv[0]);
 114                 exit(EXIT_SUCCESS);
 115                 break;
 116             case 'v':
 117                 if (optarg) {
 118                     st->logging_level = atoi(optarg);
 119                 } else {
 120                     st->logging_level = DEFAULT_LOGGING_LEVEL;
 121                 }
 122                 break;
 123             case '1':
 124                 st->stlink_version = 1;
 125                 break;
 126             case 's':
 127                 sscanf(optarg, "%i", &q);
 128                 if (q < 0 || q > 2) {
 129                     fprintf(stderr, "stlink version %d unknown!\n", q);
 130                     exit(EXIT_FAILURE);
 131                 }
 132                 st->stlink_version = q;
 133                 break;
 134             case 'p':
 135                 sscanf(optarg, "%i", &q);
 136                 if (q < 0) {
 137                     fprintf(stderr, "Can't use a negative port to listen on: %d\n", q);
 138                     exit(EXIT_FAILURE);
 139                 }
 140                 st->listen_port = q;
 141                 break;
 142             case 'm':
 143                 st->persistent = 1;
 144                 break;
 145             case 'n':
 146                 st->reset = 0;
 147                 break;
 148         }
 149     }
 150
 151     if (optind < argc) {
 152         printf("non-option ARGV-elements: ");
 153         while (optind < argc)
 154             printf("%s ", argv[optind++]);
 155         printf("\n");
 156     }
 157     return 0;
 158 }
 159
 160
 161 int main(int argc, char** argv) {
 162     int32_t voltage;
 163
 164     stlink_t *sl = NULL;
 165
 166     st_state_t state;
 167     memset(&state, 0, sizeof(state));
 168     // set defaults...
 169     state.stlink_version = 2;
 170     state.logging_level = DEFAULT_LOGGING_LEVEL;
 171     state.listen_port = DEFAULT_GDB_LISTEN_PORT;
 172     state.reset = 1;    /* By default, reset board */
 173     parse_options(argc, argv, &state);
 174     switch (state.stlink_version) {
 175         case 2:
 176             sl = stlink_open_usb(state.logging_level, 0);
 177             if(sl == NULL) return 1;
 178             break;
 179         case 1:
 180             sl = stlink_v1_open(state.logging_level, 0);
 181             if(sl == NULL) return 1;
 182             break;
 183     }
 184
 185     connected_stlink = sl;
 186     signal(SIGINT, &cleanup);
 187     signal(SIGTERM, &cleanup);
 188
 189     if (state.reset) {
 190         stlink_reset(sl);
 191     }
 192
 193     ILOG("Chip ID is %08x, Core ID is  %08x.\n", sl->chip_id, sl->core_id);
 194
 195     voltage = stlink_target_voltage(sl);
 196     if (voltage != -1) {
 197         ILOG("Target voltage is %d mV.\n", voltage);
 198     }
 199
 200     sl->verbose=0;
 201
 202     current_memory_map = make_memory_map(sl);
 203
 204 #ifdef __MINGW32__
 205     WSADATA     wsadata;
 206     if (WSAStartup(MAKEWORD(2,2),&wsadata) !=0 ) {
 207         goto winsock_error;
 208     }
 209 #endif
 210
 211     do {
 212         serve(sl, &state);
 213
 214         /* Continue */
 215         stlink_run(sl);
 216     } while (state.persistent);
 217
 218 #ifdef __MINGW32__
 219 winsock_error:
 220     WSACleanup();
 221 #endif
 222
 223     /* Switch back to mass storage mode before closing. */
 224     stlink_exit_debug_mode(sl);
 225     stlink_close(sl);
 226
 227     return 0;
 228 }
 229
 230 static const char* const target_description_F4 =
 231     "<?xml version=\"1.0\"?>"
 232     "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 233     "<target version=\"1.0\">"
 234     "   <architecture>arm</architecture>"
 235     "   <feature name=\"org.gnu.gdb.arm.m-profile\">"
 236     "       <reg name=\"r0\" bitsize=\"32\"/>"
 237     "       <reg name=\"r1\" bitsize=\"32\"/>"
 238     "       <reg name=\"r2\" bitsize=\"32\"/>"
 239     "       <reg name=\"r3\" bitsize=\"32\"/>"
 240     "       <reg name=\"r4\" bitsize=\"32\"/>"
 241     "       <reg name=\"r5\" bitsize=\"32\"/>"
 242     "       <reg name=\"r6\" bitsize=\"32\"/>"
 243     "       <reg name=\"r7\" bitsize=\"32\"/>"
 244     "       <reg name=\"r8\" bitsize=\"32\"/>"
 245     "       <reg name=\"r9\" bitsize=\"32\"/>"
 246     "       <reg name=\"r10\" bitsize=\"32\"/>"
 247     "       <reg name=\"r11\" bitsize=\"32\"/>"
 248     "       <reg name=\"r12\" bitsize=\"32\"/>"
 249     "       <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>"
 250     "       <reg name=\"lr\" bitsize=\"32\"/>"
 251     "       <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>"
 252     "       <reg name=\"xpsr\" bitsize=\"32\" regnum=\"25\"/>"
 253     "       <reg name=\"msp\" bitsize=\"32\" regnum=\"26\" type=\"data_ptr\" group=\"general\" />"
 254     "       <reg name=\"psp\" bitsize=\"32\" regnum=\"27\" type=\"data_ptr\" group=\"general\" />"
 255     "       <reg name=\"control\" bitsize=\"8\" regnum=\"28\" type=\"int\" group=\"general\" />"
 256     "       <reg name=\"faultmask\" bitsize=\"8\" regnum=\"29\" type=\"int\" group=\"general\" />"
 257     "       <reg name=\"basepri\" bitsize=\"8\" regnum=\"30\" type=\"int\" group=\"general\" />"
 258     "       <reg name=\"primask\" bitsize=\"8\" regnum=\"31\" type=\"int\" group=\"general\" />"
 259     "       <reg name=\"s0\" bitsize=\"32\" regnum=\"32\" type=\"float\" group=\"float\" />"
 260     "       <reg name=\"s1\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 261     "       <reg name=\"s2\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 262     "       <reg name=\"s3\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 263     "       <reg name=\"s4\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 264     "       <reg name=\"s5\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 265     "       <reg name=\"s6\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 266     "       <reg name=\"s7\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 267     "       <reg name=\"s8\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 268     "       <reg name=\"s9\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 269     "       <reg name=\"s10\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 270     "       <reg name=\"s11\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 271     "       <reg name=\"s12\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 272     "       <reg name=\"s13\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 273     "       <reg name=\"s14\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 274     "       <reg name=\"s15\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 275     "       <reg name=\"s16\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 276     "       <reg name=\"s17\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 277     "       <reg name=\"s18\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 278     "       <reg name=\"s19\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 279     "       <reg name=\"s20\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 280     "       <reg name=\"s21\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 281     "       <reg name=\"s22\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 282     "       <reg name=\"s23\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 283     "       <reg name=\"s24\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 284     "       <reg name=\"s25\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 285     "       <reg name=\"s26\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 286     "       <reg name=\"s27\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 287     "       <reg name=\"s28\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 288     "       <reg name=\"s29\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 289     "       <reg name=\"s30\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 290     "       <reg name=\"s31\" bitsize=\"32\" type=\"float\" group=\"float\" />"
 291     "       <reg name=\"fpscr\" bitsize=\"32\" type=\"int\" group=\"float\" />"
 292     "   </feature>"
 293     "</target>";
 294
 295 static const char* const memory_map_template_F4 =
 296     "<?xml version=\"1.0\"?>"
 297     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 298     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 299     "<memory-map>"
 300     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>"     // code = sram, bootrom or flash; flash is bigger
 301     "  <memory type=\"ram\" start=\"0x10000000\" length=\"0x10000\"/>"      // ccm ram
 302     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"/>"      // sram
 303     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x10000\">"     //Sectors 0..3
 304     "    <property name=\"blocksize\">0x4000</property>"                    //16kB
 305     "  </memory>"
 306     "  <memory type=\"flash\" start=\"0x08010000\" length=\"0x10000\">"     //Sector 4
 307     "    <property name=\"blocksize\">0x10000</property>"                   //64kB
 308     "  </memory>"
 309     "  <memory type=\"flash\" start=\"0x08020000\" length=\"0xE0000\">"     //Sectors 5..11
 310     "    <property name=\"blocksize\">0x20000</property>"                   //128kB
 311     "  </memory>"
 312     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 313     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 314     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 315     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 316     "</memory-map>";
 317
 318 static const char* const memory_map_template =
 319     "<?xml version=\"1.0\"?>"
 320     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 321     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 322     "<memory-map>"
 323     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 324     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram 8k
 325     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 326     "    <property name=\"blocksize\">0x%zx</property>"
 327     "  </memory>"
 328     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 329     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 330     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 331     "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"         // option byte area
 332     "</memory-map>";
 333
 334 char* make_memory_map(stlink_t *sl) {
 335     /* This will be freed in serve() */
 336     char* map = malloc(4096);
 337     map[0] = '\0';
 338
 339     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 340         strcpy(map, memory_map_template_F4);
 341     } else {
 342         snprintf(map, 4096, memory_map_template,
 343                 sl->flash_size,
 344                 sl->sram_size,
 345                 sl->flash_size, sl->flash_pgsz,
 346                 sl->sys_base, sl->sys_size);
 347     }
 348     return map;
 349 }
 350
 351
 352 /*
 353  * DWT_COMP0     0xE0001020
 354  * DWT_MASK0     0xE0001024
 355  * DWT_FUNCTION0 0xE0001028
 356  * DWT_COMP1     0xE0001030
 357  * DWT_MASK1     0xE0001034
 358  * DWT_FUNCTION1 0xE0001038
 359  * DWT_COMP2     0xE0001040
 360  * DWT_MASK2     0xE0001044
 361  * DWT_FUNCTION2 0xE0001048
 362  * DWT_COMP3     0xE0001050
 363  * DWT_MASK3     0xE0001054
 364  * DWT_FUNCTION3 0xE0001058
 365  */
 366
 367 #define DATA_WATCH_NUM 4
 368
 369 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 370
 371 struct code_hw_watchpoint {
 372     stm32_addr_t addr;
 373     uint8_t mask;
 374     enum watchfun fun;
 375 };
 376
 377 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 378
 379 static void init_data_watchpoints(stlink_t *sl) {
 380     DLOG("init watchpoints\n");
 381
 382     // set trcena in debug command to turn on dwt unit
 383     stlink_write_debug32(sl, 0xE000EDFC,
 384             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 385
 386     // make sure all watchpoints are cleared
 387     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 388         data_watches[i].fun = WATCHDISABLED;
 389         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 390     }
 391 }
 392
 393 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 394                                stm32_addr_t addr, unsigned int len) {
 395     int i = 0;
 396     uint32_t mask;
 397
 398     // computer mask
 399     // find a free watchpoint
 400     // configure
 401
 402     mask = -1;
 403     i = len;
 404     while(i) {
 405         i >>= 1;
 406         mask++;
 407     }
 408
 409     if((mask != (uint32_t)-1) && (mask < 16)) {
 410         for(i = 0; i < DATA_WATCH_NUM; i++) {
 411             // is this an empty slot ?
 412             if(data_watches[i].fun == WATCHDISABLED) {
 413                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 414
 415                 data_watches[i].fun = wf;
 416                 data_watches[i].addr = addr;
 417                 data_watches[i].mask = mask;
 418
 419                 // insert comparator address
 420                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 421
 422                 // insert mask
 423                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 424
 425                 // insert function
 426                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 427
 428                 // just to make sure the matched bit is clear !
 429                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 430                 return 0;
 431             }
 432         }
 433     }
 434
 435     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 436     return -1;
 437 }
 438
 439 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 440 {
 441     int i;
 442
 443     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 444         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 445             DLOG("delete watchpoint %d addr %x\n", i, addr);
 446
 447             data_watches[i].fun = WATCHDISABLED;
 448             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 449
 450             return 0;
 451         }
 452     }
 453
 454     DLOG("failure: delete watchpoint addr %x\n", addr);
 455
 456     return -1;
 457 }
 458
 459 #define CODE_BREAK_NUM  6
 460 #define CODE_LIT_NUM    2
 461 #define CODE_BREAK_LOW  0x01
 462 #define CODE_BREAK_HIGH 0x02
 463
 464 struct code_hw_breakpoint {
 465     stm32_addr_t addr;
 466     int          type;
 467 };
 468
 469 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 470
 471 static void init_code_breakpoints(stlink_t *sl) {
 472     memset(sl->q_buf, 0, 4);
 473     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 474     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 475     if (((val & 3) != 1) ||
 476             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 477             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 478         ELOG("[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 479                 ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 480     }
 481
 482
 483     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 484         code_breaks[i].type = 0;
 485         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 486     }
 487 }
 488
 489 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 490     stm32_addr_t fpb_addr = addr & ~0x3;
 491     int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 492
 493     if(addr & 1) {
 494         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 495         return -1;
 496     }
 497
 498     int id = -1;
 499     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 500         if(fpb_addr == code_breaks[i].addr ||
 501                 (set && code_breaks[i].type == 0)) {
 502             id = i;
 503             break;
 504         }
 505     }
 506
 507     if(id == -1) {
 508         if(set) return -1; // Free slot not found
 509         else    return 0;  // Breakpoint is already removed
 510     }
 511
 512     struct code_hw_breakpoint* brk = &code_breaks[id];
 513
 514     brk->addr = fpb_addr;
 515
 516     if(set) brk->type |= type;
 517     else        brk->type &= ~type;
 518
 519     if(brk->type == 0) {
 520         DLOG("clearing hw break %d\n", id);
 521
 522         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 523     } else {
 524         uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 525
 526         DLOG("setting hw break %d at %08x (%d)\n",
 527                     id, brk->addr, brk->type);
 528         DLOG("reg %08x \n",
 529                     mask);
 530
 531         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 532     }
 533
 534     return 0;
 535 }
 536
 537
 538 struct flash_block {
 539     stm32_addr_t addr;
 540     unsigned     length;
 541     uint8_t*     data;
 542
 543     struct flash_block* next;
 544 };
 545
 546 static struct flash_block* flash_root;
 547
 548 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 549
 550     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 551         ELOG("flash_add_block: incorrect bounds\n");
 552         return -1;
 553     }
 554
 555     stlink_calculate_pagesize(sl, addr);
 556     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 557         ELOG("flash_add_block: unaligned block\n");
 558         return -1;
 559     }
 560
 561     struct flash_block* new = malloc(sizeof(struct flash_block));
 562     new->next = flash_root;
 563
 564     new->addr   = addr;
 565     new->length = length;
 566     new->data   = calloc(length, 1);
 567
 568     flash_root = new;
 569
 570     return 0;
 571 }
 572
 573 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 574     unsigned int fit_blocks = 0, fit_length = 0;
 575
 576     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 577         /* Block: ------X------Y--------
 578          * Data:            a-----b
 579          *                a--b
 580          *            a-----------b
 581          * Block intersects with data, if:
 582          *  a < Y && b > x
 583          */
 584
 585         unsigned X = fb->addr, Y = fb->addr + fb->length;
 586         unsigned a = addr, b = addr + length;
 587         if(a < Y && b > X) {
 588             // from start of the block
 589             unsigned start = (a > X ? a : X) - X;
 590             unsigned end   = (b > Y ? Y : b) - X;
 591
 592             memcpy(fb->data + start, data, end - start);
 593
 594             fit_blocks++;
 595             fit_length += end - start;
 596         }
 597     }
 598
 599     if(fit_blocks == 0) {
 600         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 601         return -1;
 602     }
 603
 604     if(fit_length != length) {
 605         WLOG("data block %08x -> %04x truncated to %04x\n",
 606                 addr, length, fit_length);
 607         WLOG("(this is not an error, just a GDB glitch)\n");
 608     }
 609
 610     return 0;
 611 }
 612
 613 static int flash_go(stlink_t *sl) {
 614     int error = -1;
 615
 616     // Some kinds of clock settings do not allow writing to flash.
 617     stlink_reset(sl);
 618
 619     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 620         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 621
 622         unsigned length = fb->length;
 623         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 624
 625             //Update FLASH_PAGE
 626             stlink_calculate_pagesize(sl, page);
 627
 628             DLOG("flash_do: page %08x\n", page);
 629
 630             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 631                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 632                 goto error;
 633         }
 634     }
 635
 636     stlink_reset(sl);
 637
 638     error = 0;
 639
 640 error:
 641     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 642         next = fb->next;
 643         free(fb->data);
 644         free(fb);
 645     }
 646
 647     flash_root = NULL;
 648
 649     return error;
 650 }
 651
 652 int serve(stlink_t *sl, st_state_t *st) {
 653     int sock = socket(AF_INET, SOCK_STREAM, 0);
 654     if(sock < 0) {
 655         perror("socket");
 656         return 1;
 657     }
 658
 659     unsigned int val = 1;
 660     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 661
 662     struct sockaddr_in serv_addr;
 663     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 664     serv_addr.sin_family = AF_INET;
 665     serv_addr.sin_addr.s_addr = INADDR_ANY;
 666     serv_addr.sin_port = htons(st->listen_port);
 667
 668     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 669         perror("bind");
 670         return 1;
 671     }
 672
 673     if(listen(sock, 5) < 0) {
 674         perror("listen");
 675         return 1;
 676     }
 677
 678     ILOG("Listening at *:%d...\n", st->listen_port);
 679
 680     int client = accept(sock, NULL, NULL);
 681     //signal (SIGINT, SIG_DFL);
 682     if(client < 0) {
 683         perror("accept");
 684         return 1;
 685     }
 686
 687     close(sock);
 688
 689     stlink_force_debug(sl);
 690     if (st->reset) {
 691         stlink_reset(sl);
 692     }
 693     init_code_breakpoints(sl);
 694     init_data_watchpoints(sl);
 695
 696     ILOG("GDB connected.\n");
 697
 698     /*
 699      * To allow resetting the chip from GDB it is required to
 700      * emulate attaching and detaching to target.
 701      */
 702     unsigned int attached = 1;
 703
 704     while(1) {
 705         char* packet;
 706
 707         int status = gdb_recv_packet(client, &packet);
 708         if(status < 0) {
 709             ELOG("cannot recv: %d\n", status);
 710             return 1;
 711         }
 712
 713         DLOG("recv: %s\n", packet);
 714
 715         char* reply = NULL;
 716         reg regp;
 717
 718         switch(packet[0]) {
 719             case 'q': {
 720                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 721                     reply = strdup("");
 722                     break;
 723                 }
 724
 725                 char *separator = strstr(packet, ":"), *params = "";
 726                 if(separator == NULL) {
 727                     separator = packet + strlen(packet);
 728                 } else {
 729                     params = separator + 1;
 730                 }
 731
 732                 unsigned queryNameLength = (separator - &packet[1]);
 733                 char* queryName = calloc(queryNameLength + 1, 1);
 734                 strncpy(queryName, &packet[1], queryNameLength);
 735
 736                 DLOG("query: %s;%s\n", queryName, params);
 737
 738                 if(!strcmp(queryName, "Supported")) {
 739                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 740                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 741                     }
 742                     else {
 743                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 744                     }
 745                 } else if(!strcmp(queryName, "Xfer")) {
 746                     char *type, *op, *__s_addr, *s_length;
 747                     char *tok = params;
 748                     char *annex __attribute__((unused));
 749
 750                     type     = strsep(&tok, ":");
 751                     op       = strsep(&tok, ":");
 752                     annex    = strsep(&tok, ":");
 753                     __s_addr   = strsep(&tok, ",");
 754                     s_length = tok;
 755
 756                     unsigned addr = strtoul(__s_addr, NULL, 16),
 757                              length = strtoul(s_length, NULL, 16);
 758
 759                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 760                                 type, op, annex, addr, length);
 761
 762                     const char* data = NULL;
 763
 764                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 765                         data = current_memory_map;
 766
 767                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 768                         data = target_description_F4;
 769
 770                     if(data) {
 771                         unsigned data_length = strlen(data);
 772                         if(addr + length > data_length)
 773                             length = data_length - addr;
 774
 775                         if(length == 0) {
 776                             reply = strdup("l");
 777                         } else {
 778                             reply = calloc(length + 2, 1);
 779                             reply[0] = 'm';
 780                             strncpy(&reply[1], data, length);
 781                         }
 782                     }
 783                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 784                     // Rcmd uses the wrong separator
 785                     char *separator = strstr(packet, ","), *params = "";
 786                     if(separator == NULL) {
 787                         separator = packet + strlen(packet);
 788                     } else {
 789                         params = separator + 1;
 790                     }
 791
 792
 793                     if (!strncmp(params,"726573756d65",12)) {// resume
 794                         DLOG("Rcmd: resume\n");
 795                         stlink_run(sl);
 796
 797                         reply = strdup("OK");
 798                     } else if (!strncmp(params,"68616c74",8)) { //halt
 799                         reply = strdup("OK");
 800
 801                         stlink_force_debug(sl);
 802
 803                         DLOG("Rcmd: halt\n");
 804                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 805                         reply = strdup("OK");
 806
 807                         stlink_jtag_reset(sl, 0);
 808                         stlink_jtag_reset(sl, 1);
 809                         stlink_force_debug(sl);
 810
 811                         DLOG("Rcmd: jtag_reset\n");
 812                     } else if (!strncmp(params,"7265736574",10)) { //reset
 813                         reply = strdup("OK");
 814
 815                         stlink_force_debug(sl);
 816                         stlink_reset(sl);
 817                         init_code_breakpoints(sl);
 818                         init_data_watchpoints(sl);
 819
 820                         DLOG("Rcmd: reset\n");
 821                     } else {
 822                         DLOG("Rcmd: %s\n", params);
 823                     }
 824
 825                 }
 826
 827                 if(reply == NULL)
 828                     reply = strdup("");
 829
 830                 free(queryName);
 831
 832                 break;
 833             }
 834
 835             case 'v': {
 836                 char *params = NULL;
 837                 char *cmdName = strtok_r(packet, ":;", &params);
 838
 839                 cmdName++; // vCommand -> Command
 840
 841                 if(!strcmp(cmdName, "FlashErase")) {
 842                     char *__s_addr, *s_length;
 843                     char *tok = params;
 844
 845                     __s_addr   = strsep(&tok, ",");
 846                     s_length = tok;
 847
 848                     unsigned addr = strtoul(__s_addr, NULL, 16),
 849                              length = strtoul(s_length, NULL, 16);
 850
 851                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 852                                 addr, length);
 853
 854                     if(flash_add_block(addr, length, sl) < 0) {
 855                         reply = strdup("E00");
 856                     } else {
 857                         reply = strdup("OK");
 858                     }
 859                 } else if(!strcmp(cmdName, "FlashWrite")) {
 860                     char *__s_addr, *data;
 861                     char *tok = params;
 862
 863                     __s_addr = strsep(&tok, ":");
 864                     data   = tok;
 865
 866                     unsigned addr = strtoul(__s_addr, NULL, 16);
 867                     unsigned data_length = status - (data - packet);
 868
 869                     // Length of decoded data cannot be more than
 870                     // encoded, as escapes are removed.
 871                     // Additional byte is reserved for alignment fix.
 872                     uint8_t *decoded = calloc(data_length + 1, 1);
 873                     unsigned dec_index = 0;
 874                     for(unsigned int i = 0; i < data_length; i++) {
 875                         if(data[i] == 0x7d) {
 876                             i++;
 877                             decoded[dec_index++] = data[i] ^ 0x20;
 878                         } else {
 879                             decoded[dec_index++] = data[i];
 880                         }
 881                     }
 882
 883                     // Fix alignment
 884                     if(dec_index % 2 != 0)
 885                         dec_index++;
 886
 887                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 888
 889                     if(flash_populate(addr, decoded, dec_index) < 0) {
 890                         reply = strdup("E00");
 891                     } else {
 892                         reply = strdup("OK");
 893                     }
 894                 } else if(!strcmp(cmdName, "FlashDone")) {
 895                     if(flash_go(sl) < 0) {
 896                         reply = strdup("E00");
 897                     } else {
 898                         reply = strdup("OK");
 899                     }
 900                 } else if(!strcmp(cmdName, "Kill")) {
 901                     attached = 0;
 902
 903                     reply = strdup("OK");
 904                 }
 905
 906                 if(reply == NULL)
 907                     reply = strdup("");
 908
 909                 break;
 910             }
 911
 912             case 'c':
 913                 stlink_run(sl);
 914
 915                 while(1) {
 916                     int status = gdb_check_for_interrupt(client);
 917                     if(status < 0) {
 918                         ELOG("cannot check for int: %d\n", status);
 919                         return 1;
 920                     }
 921
 922                     if(status == 1) {
 923                         stlink_force_debug(sl);
 924                         break;
 925                     }
 926
 927                     stlink_status(sl);
 928                     if(sl->core_stat == STLINK_CORE_HALTED) {
 929                         break;
 930                     }
 931
 932                     usleep(100000);
 933                 }
 934
 935                 reply = strdup("S05"); // TRAP
 936                 break;
 937
 938             case 's':
 939                 stlink_step(sl);
 940
 941                 reply = strdup("S05"); // TRAP
 942                 break;
 943
 944             case '?':
 945                 if(attached) {
 946                     reply = strdup("S05"); // TRAP
 947                 } else {
 948                     /* Stub shall reply OK if not attached. */
 949                     reply = strdup("OK");
 950                 }
 951                 break;
 952
 953             case 'g':
 954                 stlink_read_all_regs(sl, &regp);
 955
 956                 reply = calloc(8 * 16 + 1, 1);
 957                 for(int i = 0; i < 16; i++)
 958                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 959
 960                 break;
 961
 962             case 'p': {
 963                 unsigned id = strtoul(&packet[1], NULL, 16);
 964                 unsigned myreg = 0xDEADDEAD;
 965
 966                 if(id < 16) {
 967                     stlink_read_reg(sl, id, &regp);
 968                     myreg = htonl(regp.r[id]);
 969                 } else if(id == 0x19) {
 970                     stlink_read_reg(sl, 16, &regp);
 971                     myreg = htonl(regp.xpsr);
 972                 } else if(id == 0x1A) {
 973                     stlink_read_reg(sl, 17, &regp);
 974                     myreg = htonl(regp.main_sp);
 975                 } else if(id == 0x1B) {
 976                     stlink_read_reg(sl, 18, &regp);
 977                     myreg = htonl(regp.process_sp);
 978                 } else if(id == 0x1C) {
 979                     stlink_read_unsupported_reg(sl, id, &regp);
 980                     myreg = htonl(regp.control);
 981                 } else if(id == 0x1D) {
 982                     stlink_read_unsupported_reg(sl, id, &regp);
 983                     myreg = htonl(regp.faultmask);
 984                 } else if(id == 0x1E) {
 985                     stlink_read_unsupported_reg(sl, id, &regp);
 986                     myreg = htonl(regp.basepri);
 987                 } else if(id == 0x1F) {
 988                     stlink_read_unsupported_reg(sl, id, &regp);
 989                     myreg = htonl(regp.primask);
 990                 } else if(id >= 0x20 && id < 0x40) {
 991                     stlink_read_unsupported_reg(sl, id, &regp);
 992                     myreg = htonl(regp.s[id-0x20]);
 993                 } else if(id == 0x40) {
 994                     stlink_read_unsupported_reg(sl, id, &regp);
 995                     myreg = htonl(regp.fpscr);
 996                 } else {
 997                     reply = strdup("E00");
 998                 }
 999
1000                 reply = calloc(8 + 1, 1);
1001                 sprintf(reply, "%08x", myreg);
1002
1003                 break;
1004             }
1005
1006             case 'P': {
1007                 char* s_reg = &packet[1];
1008                 char* s_value = strstr(&packet[1], "=") + 1;
1009
1010                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1011                 unsigned value = strtoul(s_value, NULL, 16);
1012
1013                 if(reg < 16) {
1014                     stlink_write_reg(sl, ntohl(value), reg);
1015                 } else if(reg == 0x19) {
1016                     stlink_write_reg(sl, ntohl(value), 16);
1017                 } else if(reg == 0x1A) {
1018                     stlink_write_reg(sl, ntohl(value), 17);
1019                 } else if(reg == 0x1B) {
1020                     stlink_write_reg(sl, ntohl(value), 18);
1021                 } else if(reg == 0x1C) {
1022                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1023                 } else if(reg == 0x1D) {
1024                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1025                 } else if(reg == 0x1E) {
1026                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1027                 } else if(reg == 0x1F) {
1028                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1029                 } else if(reg >= 0x20 && reg < 0x40) {
1030                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1031                 } else if(reg == 0x40) {
1032                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1033                 } else {
1034                     reply = strdup("E00");
1035                 }
1036
1037                 if(!reply) {
1038                     reply = strdup("OK");
1039                 }
1040
1041                 break;
1042             }
1043
1044             case 'G':
1045                 for(int i = 0; i < 16; i++) {
1046                     char str[9] = {0};
1047                     strncpy(str, &packet[1 + i * 8], 8);
1048                     uint32_t reg = strtoul(str, NULL, 16);
1049                     stlink_write_reg(sl, ntohl(reg), i);
1050                 }
1051
1052                 reply = strdup("OK");
1053                 break;
1054
1055             case 'm': {
1056                 char* s_start = &packet[1];
1057                 char* s_count = strstr(&packet[1], ",") + 1;
1058
1059                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1060                 unsigned     count = strtoul(s_count, NULL, 16);
1061
1062                 unsigned adj_start = start % 4;
1063                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1064
1065                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1066
1067                 reply = calloc(count * 2 + 1, 1);
1068                 for(unsigned int i = 0; i < count; i++) {
1069                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1070                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1071                 }
1072
1073                 break;
1074             }
1075
1076             case 'M': {
1077                 char* s_start = &packet[1];
1078                 char* s_count = strstr(&packet[1], ",") + 1;
1079                 char* hexdata = strstr(packet, ":") + 1;
1080
1081                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1082                 unsigned     count = strtoul(s_count, NULL, 16);
1083
1084                 if(start % 4) {
1085                     unsigned align_count = 4 - start % 4;
1086                     if (align_count > count) align_count = count;
1087                     for(unsigned int i = 0; i < align_count; i ++) {
1088                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1089                         uint8_t byte = strtoul(hex, NULL, 16);
1090                         sl->q_buf[i] = byte;
1091                     }
1092                     stlink_write_mem8(sl, start, align_count);
1093                     start += align_count;
1094                     count -= align_count;
1095                     hexdata += 2*align_count;
1096                 }
1097
1098                 if(count - count % 4) {
1099                     unsigned aligned_count = count - count % 4;
1100
1101                     for(unsigned int i = 0; i < aligned_count; i ++) {
1102                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1103                         uint8_t byte = strtoul(hex, NULL, 16);
1104                         sl->q_buf[i] = byte;
1105                     }
1106                     stlink_write_mem32(sl, start, aligned_count);
1107                     count -= aligned_count;
1108                     start += aligned_count;
1109                     hexdata += 2*aligned_count;
1110                 }
1111
1112                 if(count) {
1113                     for(unsigned int i = 0; i < count; i ++) {
1114                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1115                         uint8_t byte = strtoul(hex, NULL, 16);
1116                         sl->q_buf[i] = byte;
1117                     }
1118                     stlink_write_mem8(sl, start, count);
1119                 }
1120                 reply = strdup("OK");
1121                 break;
1122             }
1123
1124             case 'Z': {
1125                 char *endptr;
1126                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1127                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1128
1129                 switch (packet[1]) {
1130                     case '1':
1131                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1132                             reply = strdup("E00");
1133                         } else {
1134                             reply = strdup("OK");
1135                         }
1136                         break;
1137
1138                     case '2':   // insert write watchpoint
1139                     case '3':   // insert read  watchpoint
1140                     case '4': { // insert access watchpoint
1141                         enum watchfun wf;
1142                         if(packet[1] == '2') {
1143                             wf = WATCHWRITE;
1144                         } else if(packet[1] == '3') {
1145                             wf = WATCHREAD;
1146                         } else {
1147                             wf = WATCHACCESS;
1148                         }
1149
1150                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1151                             reply = strdup("E00");
1152                         } else {
1153                             reply = strdup("OK");
1154                             break;
1155                         }
1156                     }
1157
1158                     default:
1159                         reply = strdup("");
1160                 }
1161                 break;
1162             }
1163             case 'z': {
1164                 char *endptr;
1165                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1166                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1167
1168                 switch (packet[1]) {
1169                     case '1': // remove breakpoint
1170                         update_code_breakpoint(sl, addr, 0);
1171                         reply = strdup("OK");
1172                         break;
1173
1174                     case '2' : // remove write watchpoint
1175                     case '3' : // remove read watchpoint
1176                     case '4' : // remove access watchpoint
1177                         if(delete_data_watchpoint(sl, addr) < 0) {
1178                             reply = strdup("E00");
1179                         } else {
1180                             reply = strdup("OK");
1181                             break;
1182                         }
1183
1184                     default:
1185                         reply = strdup("");
1186                 }
1187                 break;
1188             }
1189
1190             case '!': {
1191                 /*
1192                  * Enter extended mode which allows restarting.
1193                  * We do support that always.
1194                  */
1195
1196                 /*
1197                  * Also, set to persistent mode
1198                  * to allow GDB disconnect.
1199                  */
1200                 st->persistent = 1;
1201
1202                 reply = strdup("OK");
1203
1204                 break;
1205             }
1206
1207             case 'R': {
1208                 /* Reset the core. */
1209
1210                 stlink_reset(sl);
1211                 init_code_breakpoints(sl);
1212                 init_data_watchpoints(sl);
1213
1214                 attached = 1;
1215
1216                 reply = strdup("OK");
1217
1218                 break;
1219             }
1220
1221             default:
1222                 reply = strdup("");
1223         }
1224
1225         if(reply) {
1226             DLOG("send: %s\n", reply);
1227
1228             int result = gdb_send_packet(client, reply);
1229             if(result != 0) {
1230                 ELOG("cannot send: %d\n", result);
1231                 free(reply);
1232                 free(packet);
1233                 return 1;
1234             }
1235
1236             free(reply);
1237         }
1238
1239         free(packet);
1240     }
1241
1242     return 0;
1243 }