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=\"0x60000000\" length=\"0x7fffffff\"/>"   // AHB3 Peripherals
 314     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 315     "  <memory type=\"rom\" start=\"0x1fff0000\" length=\"0x7800\"/>"       // bootrom
 316     "  <memory type=\"rom\" start=\"0x1fffc000\" length=\"0x10\"/>"         // option byte area
 317     "</memory-map>";
 318
 319 static const char* const memory_map_template =
 320     "<?xml version=\"1.0\"?>"
 321     "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 322     "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 323     "<memory-map>"
 324     "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%zx\"/>"        // code = sram, bootrom or flash; flash is bigger
 325     "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%zx\"/>"        // sram 8k
 326     "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%zx\">"
 327     "    <property name=\"blocksize\">0x%zx</property>"
 328     "  </memory>"
 329     "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>"   // peripheral regs
 330     "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>"   // cortex regs
 331     "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%zx\"/>"            // bootrom
 332     "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x10\"/>"         // option byte area
 333     "</memory-map>";
 334
 335 char* make_memory_map(stlink_t *sl) {
 336     /* This will be freed in serve() */
 337     char* map = malloc(4096);
 338     map[0] = '\0';
 339
 340     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 341         strcpy(map, memory_map_template_F4);
 342     } else {
 343         snprintf(map, 4096, memory_map_template,
 344                 sl->flash_size,
 345                 sl->sram_size,
 346                 sl->flash_size, sl->flash_pgsz,
 347                 sl->sys_base, sl->sys_size);
 348     }
 349     return map;
 350 }
 351
 352
 353 /*
 354  * DWT_COMP0     0xE0001020
 355  * DWT_MASK0     0xE0001024
 356  * DWT_FUNCTION0 0xE0001028
 357  * DWT_COMP1     0xE0001030
 358  * DWT_MASK1     0xE0001034
 359  * DWT_FUNCTION1 0xE0001038
 360  * DWT_COMP2     0xE0001040
 361  * DWT_MASK2     0xE0001044
 362  * DWT_FUNCTION2 0xE0001048
 363  * DWT_COMP3     0xE0001050
 364  * DWT_MASK3     0xE0001054
 365  * DWT_FUNCTION3 0xE0001058
 366  */
 367
 368 #define DATA_WATCH_NUM 4
 369
 370 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 371
 372 struct code_hw_watchpoint {
 373     stm32_addr_t addr;
 374     uint8_t mask;
 375     enum watchfun fun;
 376 };
 377
 378 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 379
 380 static void init_data_watchpoints(stlink_t *sl) {
 381     DLOG("init watchpoints\n");
 382
 383     // set trcena in debug command to turn on dwt unit
 384     stlink_write_debug32(sl, 0xE000EDFC,
 385             stlink_read_debug32(sl, 0xE000EDFC) | (1<<24));
 386
 387     // make sure all watchpoints are cleared
 388     for(int i = 0; i < DATA_WATCH_NUM; i++) {
 389         data_watches[i].fun = WATCHDISABLED;
 390         stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 391     }
 392 }
 393
 394 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf,
 395                                stm32_addr_t addr, unsigned int len) {
 396     int i = 0;
 397     uint32_t mask;
 398
 399     // computer mask
 400     // find a free watchpoint
 401     // configure
 402
 403     mask = -1;
 404     i = len;
 405     while(i) {
 406         i >>= 1;
 407         mask++;
 408     }
 409
 410     if((mask != (uint32_t)-1) && (mask < 16)) {
 411         for(i = 0; i < DATA_WATCH_NUM; i++) {
 412             // is this an empty slot ?
 413             if(data_watches[i].fun == WATCHDISABLED) {
 414                 DLOG("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 415
 416                 data_watches[i].fun = wf;
 417                 data_watches[i].addr = addr;
 418                 data_watches[i].mask = mask;
 419
 420                 // insert comparator address
 421                 stlink_write_debug32(sl, 0xE0001020 + i * 16, addr);
 422
 423                 // insert mask
 424                 stlink_write_debug32(sl, 0xE0001024 + i * 16, mask);
 425
 426                 // insert function
 427                 stlink_write_debug32(sl, 0xE0001028 + i * 16, wf);
 428
 429                 // just to make sure the matched bit is clear !
 430                 stlink_read_debug32(sl,  0xE0001028 + i * 16);
 431                 return 0;
 432             }
 433         }
 434     }
 435
 436     DLOG("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 437     return -1;
 438 }
 439
 440 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 441 {
 442     int i;
 443
 444     for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 445         if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 446             DLOG("delete watchpoint %d addr %x\n", i, addr);
 447
 448             data_watches[i].fun = WATCHDISABLED;
 449             stlink_write_debug32(sl, 0xe0001028 + i * 16, 0);
 450
 451             return 0;
 452         }
 453     }
 454
 455     DLOG("failure: delete watchpoint addr %x\n", addr);
 456
 457     return -1;
 458 }
 459
 460 #define CODE_BREAK_NUM  6
 461 #define CODE_LIT_NUM    2
 462 #define CODE_BREAK_LOW  0x01
 463 #define CODE_BREAK_HIGH 0x02
 464
 465 struct code_hw_breakpoint {
 466     stm32_addr_t addr;
 467     int          type;
 468 };
 469
 470 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 471
 472 static void init_code_breakpoints(stlink_t *sl) {
 473     memset(sl->q_buf, 0, 4);
 474     stlink_write_debug32(sl, CM3_REG_FP_CTRL, 0x03 /*KEY | ENABLE4*/);
 475     unsigned int val = stlink_read_debug32(sl, CM3_REG_FP_CTRL);
 476     if (((val & 3) != 1) ||
 477             ((((val >> 8) & 0x70) | ((val >> 4) & 0xf)) != CODE_BREAK_NUM) ||
 478             (((val >> 8) & 0xf) != CODE_LIT_NUM)){
 479         ELOG("[FP_CTRL] = 0x%08x expecting 0x%08x\n", val,
 480                 ((CODE_BREAK_NUM & 0x70) << 8) | (CODE_LIT_NUM << 8) |  ((CODE_BREAK_NUM & 0xf) << 4) | 1);
 481     }
 482
 483
 484     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 485         code_breaks[i].type = 0;
 486         stlink_write_debug32(sl, CM3_REG_FP_COMP0 + i * 4, 0);
 487     }
 488 }
 489
 490 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 491     stm32_addr_t fpb_addr = addr & ~0x3;
 492     int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 493
 494     if(addr & 1) {
 495         ELOG("update_code_breakpoint: unaligned address %08x\n", addr);
 496         return -1;
 497     }
 498
 499     int id = -1;
 500     for(int i = 0; i < CODE_BREAK_NUM; i++) {
 501         if(fpb_addr == code_breaks[i].addr ||
 502                 (set && code_breaks[i].type == 0)) {
 503             id = i;
 504             break;
 505         }
 506     }
 507
 508     if(id == -1) {
 509         if(set) return -1; // Free slot not found
 510         else    return 0;  // Breakpoint is already removed
 511     }
 512
 513     struct code_hw_breakpoint* brk = &code_breaks[id];
 514
 515     brk->addr = fpb_addr;
 516
 517     if(set) brk->type |= type;
 518     else        brk->type &= ~type;
 519
 520     if(brk->type == 0) {
 521         DLOG("clearing hw break %d\n", id);
 522
 523         stlink_write_debug32(sl, 0xe0002008 + id * 4, 0);
 524     } else {
 525         uint32_t mask = (brk->addr) | 1 | (brk->type << 30);
 526
 527         DLOG("setting hw break %d at %08x (%d)\n",
 528                     id, brk->addr, brk->type);
 529         DLOG("reg %08x \n",
 530                     mask);
 531
 532         stlink_write_debug32(sl, 0xe0002008 + id * 4, mask);
 533     }
 534
 535     return 0;
 536 }
 537
 538
 539 struct flash_block {
 540     stm32_addr_t addr;
 541     unsigned     length;
 542     uint8_t*     data;
 543
 544     struct flash_block* next;
 545 };
 546
 547 static struct flash_block* flash_root;
 548
 549 static int flash_add_block(stm32_addr_t addr, unsigned length, stlink_t *sl) {
 550
 551     if(addr < FLASH_BASE || addr + length > FLASH_BASE + sl->flash_size) {
 552         ELOG("flash_add_block: incorrect bounds\n");
 553         return -1;
 554     }
 555
 556     stlink_calculate_pagesize(sl, addr);
 557     if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 558         ELOG("flash_add_block: unaligned block\n");
 559         return -1;
 560     }
 561
 562     struct flash_block* new = malloc(sizeof(struct flash_block));
 563     new->next = flash_root;
 564
 565     new->addr   = addr;
 566     new->length = length;
 567     new->data   = calloc(length, 1);
 568
 569     flash_root = new;
 570
 571     return 0;
 572 }
 573
 574 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 575     unsigned int fit_blocks = 0, fit_length = 0;
 576
 577     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 578         /* Block: ------X------Y--------
 579          * Data:            a-----b
 580          *                a--b
 581          *            a-----------b
 582          * Block intersects with data, if:
 583          *  a < Y && b > x
 584          */
 585
 586         unsigned X = fb->addr, Y = fb->addr + fb->length;
 587         unsigned a = addr, b = addr + length;
 588         if(a < Y && b > X) {
 589             // from start of the block
 590             unsigned start = (a > X ? a : X) - X;
 591             unsigned end   = (b > Y ? Y : b) - X;
 592
 593             memcpy(fb->data + start, data, end - start);
 594
 595             fit_blocks++;
 596             fit_length += end - start;
 597         }
 598     }
 599
 600     if(fit_blocks == 0) {
 601         ELOG("Unfit data block %08x -> %04x\n", addr, length);
 602         return -1;
 603     }
 604
 605     if(fit_length != length) {
 606         WLOG("data block %08x -> %04x truncated to %04x\n",
 607                 addr, length, fit_length);
 608         WLOG("(this is not an error, just a GDB glitch)\n");
 609     }
 610
 611     return 0;
 612 }
 613
 614 static int flash_go(stlink_t *sl) {
 615     int error = -1;
 616
 617     // Some kinds of clock settings do not allow writing to flash.
 618     stlink_reset(sl);
 619
 620     for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 621         DLOG("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 622
 623         unsigned length = fb->length;
 624         for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 625
 626             //Update FLASH_PAGE
 627             stlink_calculate_pagesize(sl, page);
 628
 629             DLOG("flash_do: page %08x\n", page);
 630
 631             if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 632                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 633                 goto error;
 634         }
 635     }
 636
 637     stlink_reset(sl);
 638
 639     error = 0;
 640
 641 error:
 642     for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 643         next = fb->next;
 644         free(fb->data);
 645         free(fb);
 646     }
 647
 648     flash_root = NULL;
 649
 650     return error;
 651 }
 652
 653 int serve(stlink_t *sl, st_state_t *st) {
 654     int sock = socket(AF_INET, SOCK_STREAM, 0);
 655     if(sock < 0) {
 656         perror("socket");
 657         return 1;
 658     }
 659
 660     unsigned int val = 1;
 661     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 662
 663     struct sockaddr_in serv_addr;
 664     memset(&serv_addr,0,sizeof(struct sockaddr_in));
 665     serv_addr.sin_family = AF_INET;
 666     serv_addr.sin_addr.s_addr = INADDR_ANY;
 667     serv_addr.sin_port = htons(st->listen_port);
 668
 669     if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 670         perror("bind");
 671         return 1;
 672     }
 673
 674     if(listen(sock, 5) < 0) {
 675         perror("listen");
 676         return 1;
 677     }
 678
 679     ILOG("Listening at *:%d...\n", st->listen_port);
 680
 681     int client = accept(sock, NULL, NULL);
 682     //signal (SIGINT, SIG_DFL);
 683     if(client < 0) {
 684         perror("accept");
 685         return 1;
 686     }
 687
 688     close(sock);
 689
 690     stlink_force_debug(sl);
 691     if (st->reset) {
 692         stlink_reset(sl);
 693     }
 694     init_code_breakpoints(sl);
 695     init_data_watchpoints(sl);
 696
 697     ILOG("GDB connected.\n");
 698
 699     /*
 700      * To allow resetting the chip from GDB it is required to
 701      * emulate attaching and detaching to target.
 702      */
 703     unsigned int attached = 1;
 704
 705     while(1) {
 706         char* packet;
 707
 708         int status = gdb_recv_packet(client, &packet);
 709         if(status < 0) {
 710             ELOG("cannot recv: %d\n", status);
 711             return 1;
 712         }
 713
 714         DLOG("recv: %s\n", packet);
 715
 716         char* reply = NULL;
 717         reg regp;
 718
 719         switch(packet[0]) {
 720             case 'q': {
 721                 if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 722                     reply = strdup("");
 723                     break;
 724                 }
 725
 726                 char *separator = strstr(packet, ":"), *params = "";
 727                 if(separator == NULL) {
 728                     separator = packet + strlen(packet);
 729                 } else {
 730                     params = separator + 1;
 731                 }
 732
 733                 unsigned queryNameLength = (separator - &packet[1]);
 734                 char* queryName = calloc(queryNameLength + 1, 1);
 735                 strncpy(queryName, &packet[1], queryNameLength);
 736
 737                 DLOG("query: %s;%s\n", queryName, params);
 738
 739                 if(!strcmp(queryName, "Supported")) {
 740                     if(sl->chip_id==STM32_CHIPID_F4 || sl->chip_id==STM32_CHIPID_F4_HD) {
 741                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+;qXfer:features:read+");
 742                     }
 743                     else {
 744                         reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 745                     }
 746                 } else if(!strcmp(queryName, "Xfer")) {
 747                     char *type, *op, *__s_addr, *s_length;
 748                     char *tok = params;
 749                     char *annex __attribute__((unused));
 750
 751                     type     = strsep(&tok, ":");
 752                     op       = strsep(&tok, ":");
 753                     annex    = strsep(&tok, ":");
 754                     __s_addr   = strsep(&tok, ",");
 755                     s_length = tok;
 756
 757                     unsigned addr = strtoul(__s_addr, NULL, 16),
 758                              length = strtoul(s_length, NULL, 16);
 759
 760                     DLOG("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 761                                 type, op, annex, addr, length);
 762
 763                     const char* data = NULL;
 764
 765                     if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 766                         data = current_memory_map;
 767
 768                     if(!strcmp(type, "features") && !strcmp(op, "read"))
 769                         data = target_description_F4;
 770
 771                     if(data) {
 772                         unsigned data_length = strlen(data);
 773                         if(addr + length > data_length)
 774                             length = data_length - addr;
 775
 776                         if(length == 0) {
 777                             reply = strdup("l");
 778                         } else {
 779                             reply = calloc(length + 2, 1);
 780                             reply[0] = 'm';
 781                             strncpy(&reply[1], data, length);
 782                         }
 783                     }
 784                 } else if(!strncmp(queryName, "Rcmd,",4)) {
 785                     // Rcmd uses the wrong separator
 786                     char *separator = strstr(packet, ","), *params = "";
 787                     if(separator == NULL) {
 788                         separator = packet + strlen(packet);
 789                     } else {
 790                         params = separator + 1;
 791                     }
 792
 793
 794                     if (!strncmp(params,"726573756d65",12)) {// resume
 795                         DLOG("Rcmd: resume\n");
 796                         stlink_run(sl);
 797
 798                         reply = strdup("OK");
 799                     } else if (!strncmp(params,"68616c74",8)) { //halt
 800                         reply = strdup("OK");
 801
 802                         stlink_force_debug(sl);
 803
 804                         DLOG("Rcmd: halt\n");
 805                     } else if (!strncmp(params,"6a7461675f7265736574",20)) { //jtag_reset
 806                         reply = strdup("OK");
 807
 808                         stlink_jtag_reset(sl, 0);
 809                         stlink_jtag_reset(sl, 1);
 810                         stlink_force_debug(sl);
 811
 812                         DLOG("Rcmd: jtag_reset\n");
 813                     } else if (!strncmp(params,"7265736574",10)) { //reset
 814                         reply = strdup("OK");
 815
 816                         stlink_force_debug(sl);
 817                         stlink_reset(sl);
 818                         init_code_breakpoints(sl);
 819                         init_data_watchpoints(sl);
 820
 821                         DLOG("Rcmd: reset\n");
 822                     } else {
 823                         DLOG("Rcmd: %s\n", params);
 824                     }
 825
 826                 }
 827
 828                 if(reply == NULL)
 829                     reply = strdup("");
 830
 831                 free(queryName);
 832
 833                 break;
 834             }
 835
 836             case 'v': {
 837                 char *params = NULL;
 838                 char *cmdName = strtok_r(packet, ":;", &params);
 839
 840                 cmdName++; // vCommand -> Command
 841
 842                 if(!strcmp(cmdName, "FlashErase")) {
 843                     char *__s_addr, *s_length;
 844                     char *tok = params;
 845
 846                     __s_addr   = strsep(&tok, ",");
 847                     s_length = tok;
 848
 849                     unsigned addr = strtoul(__s_addr, NULL, 16),
 850                              length = strtoul(s_length, NULL, 16);
 851
 852                     DLOG("FlashErase: addr:%08x,len:%04x\n",
 853                                 addr, length);
 854
 855                     if(flash_add_block(addr, length, sl) < 0) {
 856                         reply = strdup("E00");
 857                     } else {
 858                         reply = strdup("OK");
 859                     }
 860                 } else if(!strcmp(cmdName, "FlashWrite")) {
 861                     char *__s_addr, *data;
 862                     char *tok = params;
 863
 864                     __s_addr = strsep(&tok, ":");
 865                     data   = tok;
 866
 867                     unsigned addr = strtoul(__s_addr, NULL, 16);
 868                     unsigned data_length = status - (data - packet);
 869
 870                     // Length of decoded data cannot be more than
 871                     // encoded, as escapes are removed.
 872                     // Additional byte is reserved for alignment fix.
 873                     uint8_t *decoded = calloc(data_length + 1, 1);
 874                     unsigned dec_index = 0;
 875                     for(unsigned int i = 0; i < data_length; i++) {
 876                         if(data[i] == 0x7d) {
 877                             i++;
 878                             decoded[dec_index++] = data[i] ^ 0x20;
 879                         } else {
 880                             decoded[dec_index++] = data[i];
 881                         }
 882                     }
 883
 884                     // Fix alignment
 885                     if(dec_index % 2 != 0)
 886                         dec_index++;
 887
 888                     DLOG("binary packet %d -> %d\n", data_length, dec_index);
 889
 890                     if(flash_populate(addr, decoded, dec_index) < 0) {
 891                         reply = strdup("E00");
 892                     } else {
 893                         reply = strdup("OK");
 894                     }
 895                 } else if(!strcmp(cmdName, "FlashDone")) {
 896                     if(flash_go(sl) < 0) {
 897                         reply = strdup("E00");
 898                     } else {
 899                         reply = strdup("OK");
 900                     }
 901                 } else if(!strcmp(cmdName, "Kill")) {
 902                     attached = 0;
 903
 904                     reply = strdup("OK");
 905                 }
 906
 907                 if(reply == NULL)
 908                     reply = strdup("");
 909
 910                 break;
 911             }
 912
 913             case 'c':
 914                 stlink_run(sl);
 915
 916                 while(1) {
 917                     int status = gdb_check_for_interrupt(client);
 918                     if(status < 0) {
 919                         ELOG("cannot check for int: %d\n", status);
 920                         return 1;
 921                     }
 922
 923                     if(status == 1) {
 924                         stlink_force_debug(sl);
 925                         break;
 926                     }
 927
 928                     stlink_status(sl);
 929                     if(sl->core_stat == STLINK_CORE_HALTED) {
 930                         break;
 931                     }
 932
 933                     usleep(100000);
 934                 }
 935
 936                 reply = strdup("S05"); // TRAP
 937                 break;
 938
 939             case 's':
 940                 stlink_step(sl);
 941
 942                 reply = strdup("S05"); // TRAP
 943                 break;
 944
 945             case '?':
 946                 if(attached) {
 947                     reply = strdup("S05"); // TRAP
 948                 } else {
 949                     /* Stub shall reply OK if not attached. */
 950                     reply = strdup("OK");
 951                 }
 952                 break;
 953
 954             case 'g':
 955                 stlink_read_all_regs(sl, &regp);
 956
 957                 reply = calloc(8 * 16 + 1, 1);
 958                 for(int i = 0; i < 16; i++)
 959                     sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 960
 961                 break;
 962
 963             case 'p': {
 964                 unsigned id = strtoul(&packet[1], NULL, 16);
 965                 unsigned myreg = 0xDEADDEAD;
 966
 967                 if(id < 16) {
 968                     stlink_read_reg(sl, id, &regp);
 969                     myreg = htonl(regp.r[id]);
 970                 } else if(id == 0x19) {
 971                     stlink_read_reg(sl, 16, &regp);
 972                     myreg = htonl(regp.xpsr);
 973                 } else if(id == 0x1A) {
 974                     stlink_read_reg(sl, 17, &regp);
 975                     myreg = htonl(regp.main_sp);
 976                 } else if(id == 0x1B) {
 977                     stlink_read_reg(sl, 18, &regp);
 978                     myreg = htonl(regp.process_sp);
 979                 } else if(id == 0x1C) {
 980                     stlink_read_unsupported_reg(sl, id, &regp);
 981                     myreg = htonl(regp.control);
 982                 } else if(id == 0x1D) {
 983                     stlink_read_unsupported_reg(sl, id, &regp);
 984                     myreg = htonl(regp.faultmask);
 985                 } else if(id == 0x1E) {
 986                     stlink_read_unsupported_reg(sl, id, &regp);
 987                     myreg = htonl(regp.basepri);
 988                 } else if(id == 0x1F) {
 989                     stlink_read_unsupported_reg(sl, id, &regp);
 990                     myreg = htonl(regp.primask);
 991                 } else if(id >= 0x20 && id < 0x40) {
 992                     stlink_read_unsupported_reg(sl, id, &regp);
 993                     myreg = htonl(regp.s[id-0x20]);
 994                 } else if(id == 0x40) {
 995                     stlink_read_unsupported_reg(sl, id, &regp);
 996                     myreg = htonl(regp.fpscr);
 997                 } else {
 998                     reply = strdup("E00");
 999                 }
1000
1001                 reply = calloc(8 + 1, 1);
1002                 sprintf(reply, "%08x", myreg);
1003
1004                 break;
1005             }
1006
1007             case 'P': {
1008                 char* s_reg = &packet[1];
1009                 char* s_value = strstr(&packet[1], "=") + 1;
1010
1011                 unsigned reg   = strtoul(s_reg,   NULL, 16);
1012                 unsigned value = strtoul(s_value, NULL, 16);
1013
1014                 if(reg < 16) {
1015                     stlink_write_reg(sl, ntohl(value), reg);
1016                 } else if(reg == 0x19) {
1017                     stlink_write_reg(sl, ntohl(value), 16);
1018                 } else if(reg == 0x1A) {
1019                     stlink_write_reg(sl, ntohl(value), 17);
1020                 } else if(reg == 0x1B) {
1021                     stlink_write_reg(sl, ntohl(value), 18);
1022                 } else if(reg == 0x1C) {
1023                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1024                 } else if(reg == 0x1D) {
1025                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1026                 } else if(reg == 0x1E) {
1027                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1028                 } else if(reg == 0x1F) {
1029                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1030                 } else if(reg >= 0x20 && reg < 0x40) {
1031                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1032                 } else if(reg == 0x40) {
1033                     stlink_write_unsupported_reg(sl, ntohl(value), reg, &regp);
1034                 } else {
1035                     reply = strdup("E00");
1036                 }
1037
1038                 if(!reply) {
1039                     reply = strdup("OK");
1040                 }
1041
1042                 break;
1043             }
1044
1045             case 'G':
1046                 for(int i = 0; i < 16; i++) {
1047                     char str[9] = {0};
1048                     strncpy(str, &packet[1 + i * 8], 8);
1049                     uint32_t reg = strtoul(str, NULL, 16);
1050                     stlink_write_reg(sl, ntohl(reg), i);
1051                 }
1052
1053                 reply = strdup("OK");
1054                 break;
1055
1056             case 'm': {
1057                 char* s_start = &packet[1];
1058                 char* s_count = strstr(&packet[1], ",") + 1;
1059
1060                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1061                 unsigned     count = strtoul(s_count, NULL, 16);
1062
1063                 unsigned adj_start = start % 4;
1064                 unsigned count_rnd = (count + adj_start + 4 - 1) / 4 * 4;
1065
1066                 stlink_read_mem32(sl, start - adj_start, count_rnd);
1067
1068                 reply = calloc(count * 2 + 1, 1);
1069                 for(unsigned int i = 0; i < count; i++) {
1070                     reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
1071                     reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
1072                 }
1073
1074                 break;
1075             }
1076
1077             case 'M': {
1078                 char* s_start = &packet[1];
1079                 char* s_count = strstr(&packet[1], ",") + 1;
1080                 char* hexdata = strstr(packet, ":") + 1;
1081
1082                 stm32_addr_t start = strtoul(s_start, NULL, 16);
1083                 unsigned     count = strtoul(s_count, NULL, 16);
1084
1085                 if(start % 4) {
1086                     unsigned align_count = 4 - start % 4;
1087                     if (align_count > count) align_count = count;
1088                     for(unsigned int i = 0; i < align_count; i ++) {
1089                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1090                         uint8_t byte = strtoul(hex, NULL, 16);
1091                         sl->q_buf[i] = byte;
1092                     }
1093                     stlink_write_mem8(sl, start, align_count);
1094                     start += align_count;
1095                     count -= align_count;
1096                     hexdata += 2*align_count;
1097                 }
1098
1099                 if(count - count % 4) {
1100                     unsigned aligned_count = count - count % 4;
1101
1102                     for(unsigned int i = 0; i < aligned_count; i ++) {
1103                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1104                         uint8_t byte = strtoul(hex, NULL, 16);
1105                         sl->q_buf[i] = byte;
1106                     }
1107                     stlink_write_mem32(sl, start, aligned_count);
1108                     count -= aligned_count;
1109                     start += aligned_count;
1110                     hexdata += 2*aligned_count;
1111                 }
1112
1113                 if(count) {
1114                     for(unsigned int i = 0; i < count; i ++) {
1115                         char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
1116                         uint8_t byte = strtoul(hex, NULL, 16);
1117                         sl->q_buf[i] = byte;
1118                     }
1119                     stlink_write_mem8(sl, start, count);
1120                 }
1121                 reply = strdup("OK");
1122                 break;
1123             }
1124
1125             case 'Z': {
1126                 char *endptr;
1127                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1128                 stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1129
1130                 switch (packet[1]) {
1131                     case '1':
1132                         if(update_code_breakpoint(sl, addr, 1) < 0) {
1133                             reply = strdup("E00");
1134                         } else {
1135                             reply = strdup("OK");
1136                         }
1137                         break;
1138
1139                     case '2':   // insert write watchpoint
1140                     case '3':   // insert read  watchpoint
1141                     case '4': { // insert access watchpoint
1142                         enum watchfun wf;
1143                         if(packet[1] == '2') {
1144                             wf = WATCHWRITE;
1145                         } else if(packet[1] == '3') {
1146                             wf = WATCHREAD;
1147                         } else {
1148                             wf = WATCHACCESS;
1149                         }
1150
1151                         if(add_data_watchpoint(sl, wf, addr, len) < 0) {
1152                             reply = strdup("E00");
1153                         } else {
1154                             reply = strdup("OK");
1155                             break;
1156                         }
1157                     }
1158
1159                     default:
1160                         reply = strdup("");
1161                 }
1162                 break;
1163             }
1164             case 'z': {
1165                 char *endptr;
1166                 stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
1167                 //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
1168
1169                 switch (packet[1]) {
1170                     case '1': // remove breakpoint
1171                         update_code_breakpoint(sl, addr, 0);
1172                         reply = strdup("OK");
1173                         break;
1174
1175                     case '2' : // remove write watchpoint
1176                     case '3' : // remove read watchpoint
1177                     case '4' : // remove access watchpoint
1178                         if(delete_data_watchpoint(sl, addr) < 0) {
1179                             reply = strdup("E00");
1180                         } else {
1181                             reply = strdup("OK");
1182                             break;
1183                         }
1184
1185                     default:
1186                         reply = strdup("");
1187                 }
1188                 break;
1189             }
1190
1191             case '!': {
1192                 /*
1193                  * Enter extended mode which allows restarting.
1194                  * We do support that always.
1195                  */
1196
1197                 /*
1198                  * Also, set to persistent mode
1199                  * to allow GDB disconnect.
1200                  */
1201                 st->persistent = 1;
1202
1203                 reply = strdup("OK");
1204
1205                 break;
1206             }
1207
1208             case 'R': {
1209                 /* Reset the core. */
1210
1211                 stlink_reset(sl);
1212                 init_code_breakpoints(sl);
1213                 init_data_watchpoints(sl);
1214
1215                 attached = 1;
1216
1217                 reply = strdup("OK");
1218
1219                 break;
1220             }
1221
1222             default:
1223                 reply = strdup("");
1224         }
1225
1226         if(reply) {
1227             DLOG("send: %s\n", reply);
1228
1229             int result = gdb_send_packet(client, reply);
1230             if(result != 0) {
1231                 ELOG("cannot send: %d\n", result);
1232                 free(reply);
1233                 free(packet);
1234                 return 1;
1235             }
1236
1237             free(reply);
1238         }
1239
1240         free(packet);
1241     }
1242
1243     return 0;
1244 }