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

   1 /* -*- tab-width:8 -*- */
   2
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <sys/socket.h>
  15 #include <netinet/in.h>
  16 #include <arpa/inet.h>
  17 #include "gdb-remote.h"
  18 #include "stlink-hw.h"
  19
  20 static const char hex[] = "0123456789abcdef";
  21
  22 // configured for STM32F100RB
  23 static const char* const c_memory_map =
  24   "<?xml version=\"1.0\"?>"
  25   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
  26   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
  27   "<memory-map>"
  28   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x100000\"/>" // code
  29   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x100000\"/>" // sram
  30   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x20000\">" // flash 128k
  31   "    <property name=\"blocksize\">0x400</property>"                 // 1k pages
  32   "  </memory>"
  33   "</memory-map>";
  34
  35 int serve(struct stlink* sl, int port);
  36
  37 int main(int argc, char** argv) {
  38         if(argc != 3) {
  39                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  40                 return 1;
  41         }
  42
  43         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  44         if (sl == NULL)
  45                 return 1;
  46
  47         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  48                 stlink_enter_swd_mode(sl);
  49
  50         stlink_core_id(sl);
  51         printf("Debugging ARM core %08x.\n", sl->core_id);
  52
  53         int port = atoi(argv[1]);
  54
  55         while(serve(sl, port) == 0);
  56
  57         stlink_close(sl);
  58
  59         return 0;
  60 }
  61
  62 int serve(struct stlink* sl, int port) {
  63         int sock = socket(AF_INET, SOCK_STREAM, 0);
  64         if(sock < 0) {
  65                 perror("socket");
  66                 return 1;
  67         }
  68
  69         unsigned int val = 1;
  70         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
  71
  72         struct sockaddr_in serv_addr = {0};
  73         serv_addr.sin_family = AF_INET;
  74         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
  75         serv_addr.sin_port = htons(port);
  76
  77         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
  78                 perror("bind");
  79                 return 1;
  80         }
  81
  82         if(listen(sock, 5) < 0) {
  83                 perror("listen");
  84                 return 1;
  85         }
  86
  87         stlink_force_debug(sl);
  88         stlink_reset(sl);
  89
  90         printf("Listening at *:%d...\n", port);
  91
  92         int client = accept(sock, NULL, NULL);
  93         if(client < 0) {
  94                 perror("accept");
  95                 return 1;
  96         }
  97
  98         close(sock);
  99
 100         printf("GDB connected.\n");
 101
 102         while(1) {
 103                 char* packet;
 104
 105                 int status = gdb_recv_packet(client, &packet);
 106                 if(status < 0) {
 107                         fprintf(stderr, "cannot recv: %d\n", status);
 108                         return 1;
 109                 }
 110
 111                 #ifdef DEBUG
 112                 printf("recv: %s\n", packet);
 113                 #endif
 114
 115                 char* reply = NULL;
 116
 117                 switch(packet[0]) {
 118                 case 'q': {
 119                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 120                                 reply = strdup("");
 121                                 break;
 122                         }
 123
 124                         char *separator = strstr(packet, ":"), *params = "";
 125                         if(separator == NULL) {
 126                                 separator = packet + strlen(packet);
 127                         } else {
 128                                 params = separator + 1;
 129                         }
 130
 131                         unsigned queryNameLength = (separator - &packet[1]);
 132                         char* queryName = calloc(queryNameLength + 1, 1);
 133                         strncpy(queryName, &packet[1], queryNameLength);
 134
 135                         #ifdef DEBUG
 136                         printf("query: %s;%s\n", queryName, params);
 137                         #endif
 138
 139                         if(!strcmp(queryName, "Supported")) {
 140                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 141                         } else if(!strcmp(queryName, "Xfer")) {
 142                                 char *type, *op, *annex, *s_addr, *s_length;
 143                                 char *tok = params;
 144
 145                                 type     = strsep(&tok, ":");
 146                                 op       = strsep(&tok, ":");
 147                                 annex    = strsep(&tok, ":");
 148                                 s_addr   = strsep(&tok, ",");
 149                                 s_length = tok;
 150
 151                                 unsigned addr = strtoul(s_addr, NULL, 16),
 152                                        length = strtoul(s_length, NULL, 16);
 153
 154                                 #ifdef DEBUG
 155                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 156                                         type, op, annex, addr, length);
 157                                 #endif
 158
 159                                 const char* data = NULL;
 160
 161                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 162                                         data = c_memory_map;
 163
 164                                 if(data) {
 165                                         unsigned data_length = strlen(data);
 166                                         if(addr + length > data_length)
 167                                                 length = data_length - addr;
 168
 169                                         if(length == 0) {
 170                                                 reply = strdup("l");
 171                                         } else {
 172                                                 reply = calloc(length + 2, 1);
 173                                                 reply[0] = 'm';
 174                                                 strncpy(&reply[1], data, length);
 175                                         }
 176                                 }
 177                         }
 178
 179                         if(reply == NULL)
 180                                 reply = strdup("");
 181
 182                         free(queryName);
 183
 184                         break;
 185                 }
 186
 187                 case 'v': {
 188                         char *separator = strstr(packet, ":"), *params = "";
 189                         if(separator == NULL) {
 190                                 separator = packet + strlen(packet);
 191                         } else {
 192                                 params = separator + 1;
 193                         }
 194
 195                         unsigned cmdNameLength = (separator - &packet[1]);
 196                         char* cmdName = calloc(cmdNameLength + 1, 1);
 197                         strncpy(cmdName, &packet[1], cmdNameLength);
 198
 199                         if(!strcmp(cmdName, "FlashErase")) {
 200                                 char *s_addr, *s_length;
 201                                 char *tok = params;
 202
 203                                 s_addr   = strsep(&tok, ",");
 204                                 s_length = tok;
 205
 206                                 unsigned addr = strtoul(s_addr, NULL, 16),
 207                                        length = strtoul(s_length, NULL, 16);
 208
 209                                 #ifdef DEBUG
 210                                 printf("FlashErase: addr:%08x,len:%04x\n",
 211                                         addr, length);
 212                                 #endif
 213
 214                                 for(stm32_addr_t cur = addr;
 215                                                 cur < addr + length; cur += 0x400) {
 216                                         #ifdef DEBUG
 217                                         printf("do_erase: %08x\n", cur);
 218                                         #endif
 219
 220                                         stlink_erase_flash_page(sl, cur);
 221                                 }
 222
 223                                 reply = strdup("OK");
 224                         } else if(!strcmp(cmdName, "FlashWrite")) {
 225                                 char *s_addr, *data;
 226                                 char *tok = params;
 227
 228                                 s_addr = strsep(&tok, ":");
 229                                 data   = tok;
 230
 231                                 unsigned addr = strtoul(s_addr, NULL, 16);
 232                                 unsigned data_length = status - (data - packet);
 233
 234                                 // Length of decoded data cannot be more than
 235                                 // encoded, as escapes are removed.
 236                                 // Additional byte is reserved for alignment fix.
 237                                 uint8_t *decoded = calloc(data_length + 1, 1);
 238                                 unsigned dec_index = 0;
 239                                 for(int i = 0; i < data_length; i++) {
 240                                         if(data[i] == 0x7d) {
 241                                                 i++;
 242                                                 decoded[dec_index++] = data[i] ^ 0x20;
 243                                         } else {
 244                                                 decoded[dec_index++] = data[i];
 245                                         }
 246                                 }
 247
 248                                 // Fix alignment
 249                                 if(dec_index % 2 != 0)
 250                                         dec_index++;
 251
 252                                 #ifdef DEBUG
 253                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 254                                 #endif
 255
 256                                 if(!stlink_write_flash(sl, addr, decoded, dec_index) < 0) {
 257                                         fprintf(stderr, "Flash write or verification failed.\n");
 258                                         reply = strdup("E00");
 259                                 } else {
 260                                         reply = strdup("OK");
 261                                 }
 262                         } else if(!strcmp(cmdName, "FlashDone")) {
 263                                 stlink_reset(sl);
 264
 265                                 reply = strdup("OK");
 266                         }
 267
 268                         if(reply == NULL)
 269                                 reply = strdup("");
 270
 271                         free(cmdName);
 272
 273                         break;
 274                 }
 275
 276                 case 'c':
 277                         stlink_run(sl);
 278
 279                         printf("Core running, waiting for interrupt (either in chip or GDB).\n");
 280
 281                         while(1) {
 282                                 int status = gdb_check_for_interrupt(client);
 283                                 if(status < 0) {
 284                                         fprintf(stderr, "cannot check for int: %d\n", status);
 285                                         return 1;
 286                                 }
 287
 288                                 if(status == 1) {
 289                                         stlink_force_debug(sl);
 290                                         break;
 291                                 }
 292
 293                                 stlink_status(sl);
 294                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 295                                         break;
 296                                 }
 297
 298                                 usleep(200000);
 299                         }
 300
 301                         reply = strdup("S05"); // TRAP
 302                         break;
 303
 304                 case 's':
 305                         stlink_step(sl);
 306
 307                         reply = strdup("S05"); // TRAP
 308                         break;
 309
 310                 case '?':
 311                         reply = strdup("S05"); // TRAP
 312                         break;
 313
 314                 case 'g':
 315                         stlink_read_all_regs(sl);
 316
 317                         reply = calloc(8 * 16 + 1, 1);
 318                         for(int i = 0; i < 16; i++)
 319                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 320
 321                         break;
 322
 323                 case 'p': {
 324                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 325
 326                         if(id < 16) {
 327                                 stlink_read_reg(sl, id);
 328                                 reg = htonl(sl->reg.r[id]);
 329                         } else if(id == 0x19) {
 330                                 stlink_read_reg(sl, 16);
 331                                 reg = htonl(sl->reg.xpsr);
 332                         } else {
 333                                 reply = strdup("E00");
 334                         }
 335
 336                         reply = calloc(8 + 1, 1);
 337                         sprintf(reply, "%08x", reg);
 338
 339                         break;
 340                 }
 341
 342                 case 'P': {
 343                         char* s_reg = &packet[1];
 344                         char* s_value = strstr(&packet[1], "=") + 1;
 345
 346                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 347                         unsigned value = strtoul(s_value, NULL, 16);
 348
 349                         if(reg < 16) {
 350                                 stlink_write_reg(sl, ntohl(value), reg);
 351                         } else if(reg == 0x19) {
 352                                 stlink_write_reg(sl, ntohl(value), 16);
 353                         } else {
 354                                 reply = strdup("E00");
 355                         }
 356
 357                         if(!reply) {
 358                                 reply = strdup("OK");
 359                         }
 360
 361                         break;
 362                 }
 363
 364                 case 'G':
 365                         for(int i = 0; i < 16; i++) {
 366                                 char str[9] = {0};
 367                                 strncpy(str, &packet[1 + i * 8], 8);
 368                                 uint32_t reg = strtoul(str, NULL, 16);
 369                                 stlink_write_reg(sl, ntohl(reg), i);
 370                         }
 371
 372                         reply = strdup("OK");
 373                         break;
 374
 375                 case 'm': {
 376                         char* s_start = &packet[1];
 377                         char* s_count = strstr(&packet[1], ",") + 1;
 378
 379                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 380                         unsigned     count = strtoul(s_count, NULL, 16);
 381
 382                         unsigned adj_start = start % 4;
 383
 384                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 385                                                 count : count + 4 - (count % 4));
 386
 387                         reply = calloc(count * 2 + 1, 1);
 388                         for(int i = 0; i < count; i++) {
 389                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 390                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 391                         }
 392
 393                         break;
 394                 }
 395
 396                 case 'M': {
 397                         char* s_start = &packet[1];
 398                         char* s_count = strstr(&packet[1], ",") + 1;
 399                         char* hexdata = strstr(packet, ":") + 1;
 400
 401                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 402                         unsigned     count = strtoul(s_count, NULL, 16);
 403
 404                         for(int i = 0; i < count; i ++) {
 405                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 406                                 uint8_t byte = strtoul(hex, NULL, 16);
 407                                 sl->q_buf[i] = byte;
 408                         }
 409
 410                         if((count % 4) == 0 && (start % 4) == 0) {
 411                                 stlink_write_mem32(sl, start, count);
 412                         } else {
 413                                 stlink_write_mem8(sl, start, count);
 414                         }
 415
 416                         reply = strdup("OK");
 417
 418                         break;
 419                 }
 420
 421                 case 'k': {
 422                         // After this function will be entered afterwards, the
 423                         // chip will be reset anyway. So this is a no-op.
 424
 425                         close(client);
 426                         return 0;
 427                 }
 428
 429                 default:
 430                         reply = strdup("");
 431                 }
 432
 433                 if(reply) {
 434                         #ifdef DEBUG
 435                         printf("send: %s\n", reply);
 436                         #endif
 437
 438                         int result = gdb_send_packet(client, reply);
 439                         if(result != 0) {
 440                                 fprintf(stderr, "cannot send: %d\n", result);
 441                                 return 1;
 442                         }
 443
 444                         free(reply);
 445                 }
 446
 447                 free(packet);
 448         }
 449
 450         return 0;
 451 }