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 int serve(struct stlink* sl, int port);
  23
  24 int main(int argc, char** argv) {
  25         if(argc != 3) {
  26                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  27                 return 1;
  28         }
  29
  30         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  31         if (sl == NULL)
  32                 return 1;
  33
  34         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  35                 stlink_enter_swd_mode(sl);
  36
  37         stlink_core_id(sl);
  38         printf("Debugging ARM core %08x.\n", sl->core_id);
  39
  40         int port = atoi(argv[1]);
  41
  42         while(serve(sl, port) == 0);
  43
  44         stlink_close(sl);
  45
  46         return 0;
  47 }
  48
  49 int serve(struct stlink* sl, int port) {
  50         int sock = socket(AF_INET, SOCK_STREAM, 0);
  51         if(sock < 0) {
  52                 perror("socket");
  53                 return 1;
  54         }
  55
  56         unsigned int val = 1;
  57         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
  58
  59         struct sockaddr_in serv_addr = {0};
  60         serv_addr.sin_family = AF_INET;
  61         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
  62         serv_addr.sin_port = htons(port);
  63
  64         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
  65                 perror("bind");
  66                 return 1;
  67         }
  68
  69         if(listen(sock, 5) < 0) {
  70                 perror("listen");
  71                 return 1;
  72         }
  73
  74         stlink_force_debug(sl);
  75         stlink_reset(sl);
  76
  77         printf("Listening at *:%d...\n", port);
  78
  79         int client = accept(sock, NULL, NULL);
  80         if(client < 0) {
  81                 perror("accept");
  82                 return 1;
  83         }
  84
  85         close(sock);
  86
  87         printf("GDB connected.\n");
  88
  89         while(1) {
  90                 char* packet;
  91
  92                 int status = gdb_recv_packet(client, &packet);
  93                 if(status < 0) {
  94                         fprintf(stderr, "cannot recv: %d\n", status);
  95                         return 1;
  96                 }
  97
  98                 #ifdef DEBUG
  99                 printf("recv: %s\n", packet);
 100                 #endif
 101
 102                 char* reply = NULL;
 103
 104                 switch(packet[0]) {
 105                 case 'c':
 106                         stlink_run(sl);
 107
 108                         printf("Core running, waiting for interrupt.\n");
 109
 110                         int status = gdb_wait_for_interrupt(client);
 111                         if(status < 0) {
 112                                 fprintf(stderr, "cannot wait for int: %d\n", status);
 113                                 return 1;
 114                         }
 115
 116                         stlink_force_debug(sl);
 117
 118                         reply = strdup("S05"); // TRAP
 119                         break;
 120
 121                 case 's':
 122                         stlink_step(sl);
 123
 124                         reply = strdup("S05"); // TRAP
 125                         break;
 126
 127                 case '?':
 128                         reply = strdup("S05"); // TRAP
 129                         break;
 130
 131                 case 'g':
 132                         stlink_read_all_regs(sl);
 133
 134                         reply = calloc(8 * 16 + 1, 1);
 135                         for(int i = 0; i < 16; i++)
 136                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 137
 138                         break;
 139
 140                 case 'p': {
 141                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 142
 143                         if(id < 16) {
 144                                 stlink_read_reg(sl, id);
 145                                 reg = htonl(sl->reg.r[id]);
 146                         } else if(id == 0x19) {
 147                                 stlink_read_reg(sl, 16);
 148                                 reg = htonl(sl->reg.xpsr);
 149                         } else {
 150                                 reply = strdup("E00");
 151                         }
 152
 153                         reply = calloc(8 + 1, 1);
 154                         sprintf(reply, "%08x", reg);
 155
 156                         break;
 157                 }
 158
 159                 case 'P': {
 160                         char* s_reg = &packet[1];
 161                         char* s_value = strstr(&packet[1], "=") + 1;
 162
 163                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 164                         unsigned value = strtoul(s_value, NULL, 16);
 165
 166                         if(reg < 16) {
 167                                 stlink_write_reg(sl, ntohl(value), reg);
 168                         } else if(reg == 0x19) {
 169                                 stlink_write_reg(sl, ntohl(value), 16);
 170                         } else {
 171                                 reply = strdup("E00");
 172                         }
 173
 174                         if(!reply) {
 175                                 reply = strdup("OK");
 176                         }
 177
 178                         break;
 179                 }
 180
 181                 case 'G':
 182                         for(int i = 0; i < 16; i++) {
 183                                 char str[9] = {0};
 184                                 strncpy(str, &packet[1 + i * 8], 8);
 185                                 uint32_t reg = strtoul(str, NULL, 16);
 186                                 stlink_write_reg(sl, ntohl(reg), i);
 187                         }
 188
 189                         reply = strdup("OK");
 190                         break;
 191
 192                 case 'm': {
 193                         char* s_start = &packet[1];
 194                         char* s_count = strstr(&packet[1], ",") + 1;
 195
 196                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 197                         unsigned     count = strtoul(s_count, NULL, 16);
 198
 199                         unsigned adj_start = start % 4;
 200
 201                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 202                                                 count : count + 4 - (count % 4));
 203
 204                         reply = calloc(count * 2 + 1, 1);
 205                         for(int i = 0; i < count; i++) {
 206                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 207                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 208                         }
 209
 210                         break;
 211                 }
 212
 213                 case 'M': {
 214                         char* s_start = &packet[1];
 215                         char* s_count = strstr(&packet[1], ",") + 1;
 216                         char* hexdata = strstr(packet, ":") + 1;
 217
 218                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 219                         unsigned     count = strtoul(s_count, NULL, 16);
 220
 221                         for(int i = 0; i < count; i ++) {
 222                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 223                                 uint8_t byte = strtoul(hex, NULL, 16);
 224                                 sl->q_buf[i] = byte;
 225                         }
 226
 227                         if((count % 4) == 0 && (start % 4) == 0) {
 228                                 stlink_write_mem32(sl, start, count);
 229                         } else {
 230                                 stlink_write_mem8(sl, start, count);
 231                         }
 232
 233                         reply = strdup("OK");
 234
 235                         break;
 236                 }
 237
 238                 case 'k': {
 239                         // After this function will be entered afterwards, the
 240                         // chip will be reset anyway. So this is a no-op.
 241
 242                         close(client);
 243                         return 0;
 244                 }
 245
 246                 default:
 247                         reply = strdup("");
 248                 }
 249
 250                 if(reply) {
 251                         #ifdef DEBUG
 252                         printf("send: %s\n", reply);
 253                         #endif
 254
 255                         int result = gdb_send_packet(client, reply);
 256                         if(result != 0) {
 257                                 fprintf(stderr, "cannot send: %d\n", result);
 258                                 return 1;
 259                         }
 260
 261                         free(reply);
 262                 }
 263
 264                 free(packet);
 265         }
 266
 267         return 0;
 268 }