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                 //printf("recv: %s\n", packet);
  99
 100                 char* reply = NULL;
 101
 102                 switch(packet[0]) {
 103                 case 'c':
 104                         stlink_run(sl);
 105
 106                         printf("Core running, waiting for interrupt.\n");
 107
 108                         int status = gdb_wait_for_interrupt(client);
 109                         if(status < 0) {
 110                                 fprintf(stderr, "cannot wait for int: %d\n", status);
 111                                 return 1;
 112                         }
 113
 114                         stlink_force_debug(sl);
 115
 116                         reply = strdup("S05"); // TRAP
 117                         break;
 118
 119                 case 's':
 120                         stlink_step(sl);
 121
 122                         reply = strdup("S05"); // TRAP
 123                         break;
 124
 125                 case '?':
 126                         reply = strdup("S05"); // TRAP
 127                         break;
 128
 129                 case 'g':
 130                         stlink_read_all_regs(sl);
 131
 132                         reply = calloc(8 * 16 + 1, 1);
 133                         for(int i = 0; i < 16; i++)
 134                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 135
 136                         break;
 137
 138                 case 'p': {
 139                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 140
 141                         if(id < 16) {
 142                                 stlink_read_reg(sl, id);
 143                                 reg = htonl(sl->reg.r[id]);
 144                         } else if(id == 0x19) {
 145                                 stlink_read_reg(sl, 16);
 146                                 reg = htonl(sl->reg.xpsr);
 147                         } else {
 148                                 reply = strdup("E00");
 149                         }
 150
 151                         reply = calloc(8 + 1, 1);
 152                         sprintf(reply, "%08x", reg);
 153
 154                         break;
 155                 }
 156
 157                 case 'P': {
 158                         char* s_reg = &packet[1];
 159                         char* s_value = strstr(&packet[1], "=") + 1;
 160
 161                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 162                         unsigned value = strtoul(s_value, NULL, 16);
 163
 164                         if(reg < 16) {
 165                                 stlink_write_reg(sl, ntohl(value), reg);
 166                         } else if(reg == 0x19) {
 167                                 stlink_write_reg(sl, ntohl(value), 16);
 168                         } else {
 169                                 reply = strdup("E00");
 170                         }
 171
 172                         if(!reply) {
 173                                 reply = strdup("OK");
 174                         }
 175
 176                         break;
 177                 }
 178
 179                 case 'G':
 180                         for(int i = 0; i < 16; i++) {
 181                                 char str[9] = {0};
 182                                 strncpy(str, &packet[1 + i * 8], 8);
 183                                 uint32_t reg = strtoul(str, NULL, 16);
 184                                 stlink_write_reg(sl, ntohl(reg), i);
 185                         }
 186
 187                         reply = strdup("OK");
 188                         break;
 189
 190                 case 'm': {
 191                         char* s_start = &packet[1];
 192                         char* s_count = strstr(&packet[1], ",") + 1;
 193
 194                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 195                         unsigned     count = strtoul(s_count, NULL, 16);
 196
 197                         unsigned adj_start = start % 4;
 198
 199                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 200                                                 count : count + 4 - (count % 4));
 201
 202                         reply = calloc(count * 2 + 1, 1);
 203                         for(int i = 0; i < count; i++) {
 204                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 205                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 206                         }
 207
 208                         break;
 209                 }
 210
 211                 case 'M': {
 212                         char* s_start = &packet[1];
 213                         char* s_count = strstr(&packet[1], ",") + 1;
 214                         char* hexdata = strstr(packet, ":") + 1;
 215
 216                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 217                         unsigned     count = strtoul(s_count, NULL, 16);
 218
 219                         for(int i = 0; i < count; i ++) {
 220                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 221                                 uint8_t byte = strtoul(hex, NULL, 16);
 222                                 sl->q_buf[i] = byte;
 223                         }
 224
 225                         if((count % 4) == 0 && (start % 4) == 0) {
 226                                 stlink_write_mem32(sl, start, count);
 227                         } else {
 228                                 stlink_write_mem8(sl, start, count);
 229                         }
 230
 231                         reply = strdup("OK");
 232
 233                         break;
 234                 }
 235
 236                 case 'k': {
 237                         // After this function will be entered afterwards, the
 238                         // chip will be reset anyway. So this is a no-op.
 239
 240                         close(client);
 241                         return 0;
 242                 }
 243
 244                 default:
 245                         reply = strdup("");
 246                 }
 247
 248                 if(reply) {
 249                         //printf("send: %s\n", reply);
 250
 251                         int result = gdb_send_packet(client, reply);
 252                         if(result != 0) {
 253                                 fprintf(stderr, "cannot send: %d\n", result);
 254                                 return 1;
 255                         }
 256
 257                         free(reply);
 258                 }
 259
 260                 free(packet);
 261         }
 262
 263         return 0;
 264 }