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 "gdb-remote.h"
  17 #include "stlink-hw.h"
  18
  19 static const char hex[] = "0123456789abcdef";
  20
  21 int serve(struct stlink* sl, int port);
  22
  23 int main(int argc, char** argv) {
  24         if(argc != 3) {
  25                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  26                 return 1;
  27         }
  28
  29         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  30         if (sl == NULL)
  31                 return 1;
  32
  33         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  34                 stlink_enter_swd_mode(sl);
  35
  36         stlink_core_id(sl);
  37         printf("Debugging ARM core %08x.\n", sl->core_id);
  38
  39         int port = atoi(argv[1]);
  40
  41         while(serve(sl, port) == 0);
  42
  43         stlink_close(sl);
  44
  45         return 0;
  46 }
  47
  48 int serve(struct stlink* sl, int port) {
  49         int sock = socket(AF_INET, SOCK_STREAM, 0);
  50         if(sock < 0) {
  51                 perror("socket");
  52                 return 1;
  53         }
  54
  55         unsigned int val = 1;
  56         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
  57
  58         struct sockaddr_in serv_addr = {0};
  59         serv_addr.sin_family = AF_INET;
  60         serv_addr.sin_addr.s_addr = INADDR_ANY;
  61         serv_addr.sin_port = htons(port);
  62
  63         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
  64                 perror("bind");
  65                 return 1;
  66         }
  67
  68         if(listen(sock, 5) < 0) {
  69                 perror("listen");
  70                 return 1;
  71         }
  72
  73         stlink_force_debug(sl);
  74         stlink_reset(sl);
  75
  76         printf("Listening at *:%d...\n", port);
  77
  78         int client = accept(sock, NULL, NULL);
  79         if(client < 0) {
  80                 perror("accept");
  81                 return 1;
  82         }
  83
  84         close(sock);
  85
  86         printf("GDB connected.\n");
  87
  88         while(1) {
  89                 char* packet;
  90
  91                 int status = gdb_recv_packet(client, &packet);
  92                 if(status < 0) {
  93                         fprintf(stderr, "cannot recv: %d\n", status);
  94                         return 1;
  95                 }
  96
  97                 //printf("recv: %s\n", packet);
  98
  99                 char* reply = NULL;
 100
 101                 switch(packet[0]) {
 102                 case 'c':
 103                         stlink_run(sl);
 104
 105                         printf("Core running, waiting for interrupt.\n");
 106
 107                         int status = gdb_wait_for_interrupt(client);
 108                         if(status < 0) {
 109                                 fprintf(stderr, "cannot wait for int: %d\n", status);
 110                                 return 1;
 111                         }
 112
 113                         stlink_force_debug(sl);
 114
 115                         reply = strdup("S05"); // TRAP
 116                         break;
 117
 118                 case 's':
 119                         stlink_step(sl);
 120
 121                         reply = strdup("S05"); // TRAP
 122                         break;
 123
 124                 case '?':
 125                         reply = strdup("S05"); // TRAP
 126                         break;
 127
 128                 case 'g':
 129                         stlink_read_all_regs(sl);
 130
 131                         reply = calloc(8 * 16 + 1, 1);
 132                         for(int i = 0; i < 16; i++)
 133                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 134
 135                         break;
 136
 137                 case 'p': {
 138                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 139
 140                         if(id < 16) {
 141                                 stlink_read_reg(sl, id);
 142                                 reg = htonl(sl->reg.r[id]);
 143                         } else if(id == 0x19) {
 144                                 stlink_read_reg(sl, 16);
 145                                 reg = htonl(sl->reg.xpsr);
 146                         } else {
 147                                 reply = strdup("E00");
 148                         }
 149
 150                         reply = calloc(8 + 1, 1);
 151                         sprintf(reply, "%08x", reg);
 152
 153                         break;
 154                 }
 155
 156                 case 'P': {
 157                         char* s_reg = &packet[1];
 158                         char* s_value = strstr(&packet[1], "=") + 1;
 159
 160                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 161                         unsigned value = strtoul(s_value, NULL, 16);
 162
 163                         if(reg < 16) {
 164                                 stlink_write_reg(sl, ntohl(value), reg);
 165                         } else if(reg == 0x19) {
 166                                 stlink_write_reg(sl, ntohl(value), 16);
 167                         } else {
 168                                 reply = strdup("E00");
 169                         }
 170
 171                         if(!reply) {
 172                                 reply = strdup("OK");
 173                         }
 174
 175                         break;
 176                 }
 177
 178                 case 'G':
 179                         for(int i = 0; i < 16; i++) {
 180                                 char str[9] = {0};
 181                                 strncpy(str, &packet[1 + i * 8], 8);
 182                                 uint32_t reg = strtoul(str, NULL, 16);
 183                                 stlink_write_reg(sl, ntohl(reg), i);
 184                         }
 185
 186                         reply = strdup("OK");
 187                         break;
 188
 189                 case 'm': {
 190                         char* s_start = &packet[1];
 191                         char* s_count = strstr(&packet[1], ",") + 1;
 192
 193                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 194                         unsigned     count = strtoul(s_count, NULL, 16);
 195
 196                         unsigned adj_start = start % 4;
 197
 198                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 199                                                 count : count + 4 - (count % 4));
 200
 201                         reply = calloc(count * 2 + 1, 1);
 202                         for(int i = 0; i < count; i++) {
 203                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 204                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 205                         }
 206
 207                         break;
 208                 }
 209
 210                 case 'M': {
 211                         char* s_start = &packet[1];
 212                         char* s_count = strstr(&packet[1], ",") + 1;
 213                         char* hexdata = strstr(packet, ":") + 1;
 214
 215                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 216                         unsigned     count = strtoul(s_count, NULL, 16);
 217
 218                         for(int i = 0; i < count; i ++) {
 219                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 220                                 uint8_t byte = strtoul(hex, NULL, 16);
 221                                 sl->q_buf[i] = byte;
 222                         }
 223
 224                         if((count % 4) == 0 && (start % 4) == 0) {
 225                                 stlink_write_mem32(sl, start, count);
 226                         } else {
 227                                 stlink_write_mem8(sl, start, count);
 228                         }
 229
 230                         reply = strdup("OK");
 231
 232                         break;
 233                 }
 234
 235                 case 'k': {
 236                         // After this function will be entered afterwards, the
 237                         // chip will be reset anyway. So this is a no-op.
 238
 239                         close(client);
 240                         return 0;
 241                 }
 242
 243                 default:
 244                         reply = strdup("");
 245                 }
 246
 247                 if(reply) {
 248                         //printf("send: %s\n", reply);
 249
 250                         int result = gdb_send_packet(client, reply);
 251                         if(result != 0) {
 252                                 fprintf(stderr, "cannot send: %d\n", result);
 253                                 return 1;
 254                         }
 255
 256                         free(reply);
 257                 }
 258
 259                 free(packet);
 260         }
 261
 262         return 0;
 263 }