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 'c':
 188                         stlink_run(sl);
 189
 190                         printf("Core running, waiting for interrupt.\n");
 191
 192                         int status = gdb_wait_for_interrupt(client);
 193                         if(status < 0) {
 194                                 fprintf(stderr, "cannot wait for int: %d\n", status);
 195                                 return 1;
 196                         }
 197
 198                         stlink_force_debug(sl);
 199
 200                         reply = strdup("S05"); // TRAP
 201                         break;
 202
 203                 case 's':
 204                         stlink_step(sl);
 205
 206                         reply = strdup("S05"); // TRAP
 207                         break;
 208
 209                 case '?':
 210                         reply = strdup("S05"); // TRAP
 211                         break;
 212
 213                 case 'g':
 214                         stlink_read_all_regs(sl);
 215
 216                         reply = calloc(8 * 16 + 1, 1);
 217                         for(int i = 0; i < 16; i++)
 218                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 219
 220                         break;
 221
 222                 case 'p': {
 223                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 224
 225                         if(id < 16) {
 226                                 stlink_read_reg(sl, id);
 227                                 reg = htonl(sl->reg.r[id]);
 228                         } else if(id == 0x19) {
 229                                 stlink_read_reg(sl, 16);
 230                                 reg = htonl(sl->reg.xpsr);
 231                         } else {
 232                                 reply = strdup("E00");
 233                         }
 234
 235                         reply = calloc(8 + 1, 1);
 236                         sprintf(reply, "%08x", reg);
 237
 238                         break;
 239                 }
 240
 241                 case 'P': {
 242                         char* s_reg = &packet[1];
 243                         char* s_value = strstr(&packet[1], "=") + 1;
 244
 245                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 246                         unsigned value = strtoul(s_value, NULL, 16);
 247
 248                         if(reg < 16) {
 249                                 stlink_write_reg(sl, ntohl(value), reg);
 250                         } else if(reg == 0x19) {
 251                                 stlink_write_reg(sl, ntohl(value), 16);
 252                         } else {
 253                                 reply = strdup("E00");
 254                         }
 255
 256                         if(!reply) {
 257                                 reply = strdup("OK");
 258                         }
 259
 260                         break;
 261                 }
 262
 263                 case 'G':
 264                         for(int i = 0; i < 16; i++) {
 265                                 char str[9] = {0};
 266                                 strncpy(str, &packet[1 + i * 8], 8);
 267                                 uint32_t reg = strtoul(str, NULL, 16);
 268                                 stlink_write_reg(sl, ntohl(reg), i);
 269                         }
 270
 271                         reply = strdup("OK");
 272                         break;
 273
 274                 case 'm': {
 275                         char* s_start = &packet[1];
 276                         char* s_count = strstr(&packet[1], ",") + 1;
 277
 278                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 279                         unsigned     count = strtoul(s_count, NULL, 16);
 280
 281                         unsigned adj_start = start % 4;
 282
 283                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 284                                                 count : count + 4 - (count % 4));
 285
 286                         reply = calloc(count * 2 + 1, 1);
 287                         for(int i = 0; i < count; i++) {
 288                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 289                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 290                         }
 291
 292                         break;
 293                 }
 294
 295                 case 'M': {
 296                         char* s_start = &packet[1];
 297                         char* s_count = strstr(&packet[1], ",") + 1;
 298                         char* hexdata = strstr(packet, ":") + 1;
 299
 300                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 301                         unsigned     count = strtoul(s_count, NULL, 16);
 302
 303                         for(int i = 0; i < count; i ++) {
 304                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 305                                 uint8_t byte = strtoul(hex, NULL, 16);
 306                                 sl->q_buf[i] = byte;
 307                         }
 308
 309                         if((count % 4) == 0 && (start % 4) == 0) {
 310                                 stlink_write_mem32(sl, start, count);
 311                         } else {
 312                                 stlink_write_mem8(sl, start, count);
 313                         }
 314
 315                         reply = strdup("OK");
 316
 317                         break;
 318                 }
 319
 320                 case 'k': {
 321                         // After this function will be entered afterwards, the
 322                         // chip will be reset anyway. So this is a no-op.
 323
 324                         close(client);
 325                         return 0;
 326                 }
 327
 328                 default:
 329                         reply = strdup("");
 330                 }
 331
 332                 if(reply) {
 333                         #ifdef DEBUG
 334                         printf("send: %s\n", reply);
 335                         #endif
 336
 337                         int result = gdb_send_packet(client, reply);
 338                         if(result != 0) {
 339                                 fprintf(stderr, "cannot send: %d\n", result);
 340                                 return 1;
 341                         }
 342
 343                         free(reply);
 344                 }
 345
 346                 free(packet);
 347         }
 348
 349         return 0;
 350 }