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