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 main(int argc, char** argv) {
  22         struct sockaddr_in serv_addr;
  23
  24         if(argc != 3) {
  25                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  26                 return 1;
  27         }
  28
  29         int port = atoi(argv[1]);
  30
  31         int sock = socket(AF_INET, SOCK_STREAM, 0);
  32         if(sock < 0) {
  33                 perror("socket");
  34                 return 1;
  35         }
  36
  37         memset((char *) &serv_addr, 0, sizeof(serv_addr));
  38         serv_addr.sin_family = AF_INET;
  39         serv_addr.sin_addr.s_addr = INADDR_ANY;
  40         serv_addr.sin_port = htons(port);
  41
  42         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
  43                 perror("bind");
  44                 return 1;
  45         }
  46
  47         if(listen(sock, 5) < 0) {
  48                 perror("listen");
  49                 return 1;
  50         }
  51
  52         struct stlink *sl = stlink_quirk_open(argv[2], 0);
  53         if (sl == NULL)
  54                 return 1;
  55
  56         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  57                 stlink_enter_swd_mode(sl);
  58
  59         stlink_core_id(sl);
  60         printf("Debugging ARM core %08x.\n", sl->core_id);
  61
  62         stlink_force_debug(sl);
  63         stlink_reset(sl);
  64
  65         printf("Listening at *:%d...\n", port);
  66
  67         int client = accept(sock, NULL, NULL);
  68         if(client < 0) {
  69                 perror("accept");
  70                 return 1;
  71         }
  72
  73         close(sock);
  74
  75         printf("GDB connected.\n");
  76
  77         while(1) {
  78                 char* packet;
  79
  80                 int status = gdb_recv_packet(client, &packet);
  81                 if(status < 0) {
  82                         fprintf(stderr, "cannot recv: %d\n", status);
  83                         return 1;
  84                 }
  85
  86                 //printf("recv: %s\n", packet);
  87
  88                 char* reply = NULL;
  89
  90                 switch(packet[0]) {
  91                 case 'c':
  92                         stlink_run(sl);
  93
  94                         printf("Core running, waiting for interrupt.\n");
  95
  96                         int status = gdb_wait_for_interrupt(client);
  97                         if(status < 0) {
  98                                 fprintf(stderr, "cannot wait for int: %d\n", status);
  99                                 return 1;
 100                         }
 101
 102                         stlink_force_debug(sl);
 103
 104                         reply = strdup("S05"); // TRAP
 105                         break;
 106
 107                 case 's':
 108                         stlink_step(sl);
 109
 110                         reply = strdup("S05"); // TRAP
 111                         break;
 112
 113                 case '?':
 114                         reply = strdup("S05"); // TRAP
 115                         break;
 116
 117                 case 'g':
 118                         stlink_read_all_regs(sl);
 119
 120                         reply = calloc(8 * 16 + 1, 1);
 121                         for(int i = 0; i < 16; i++)
 122                                 sprintf(&reply[i * 8], "%08x", htonl(sl->reg.r[i]));
 123
 124                         break;
 125
 126                 case 'p': {
 127                         unsigned id = strtoul(&packet[1], NULL, 16), reg = 0xDEADDEAD;
 128
 129                         if(id < 16) {
 130                                 stlink_read_reg(sl, id);
 131                                 reg = htonl(sl->reg.r[id]);
 132                         } else if(id == 0x19) {
 133                                 stlink_read_reg(sl, 16);
 134                                 reg = htonl(sl->reg.xpsr);
 135                         } else {
 136                                 reply = strdup("E00");
 137                         }
 138
 139                         reply = calloc(8 + 1, 1);
 140                         sprintf(reply, "%08x", reg);
 141
 142                         break;
 143                 }
 144
 145                 case 'P': {
 146                         char* s_reg = &packet[1];
 147                         char* s_value = strstr(&packet[1], "=") + 1;
 148
 149                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 150                         unsigned value = strtoul(s_value, NULL, 16);
 151
 152                         if(reg < 16) {
 153                                 stlink_write_reg(sl, ntohl(value), reg);
 154                         } else if(reg == 0x19) {
 155                                 stlink_write_reg(sl, ntohl(value), 16);
 156                         } else {
 157                                 reply = strdup("E00");
 158                         }
 159
 160                         if(!reply) {
 161                                 reply = strdup("OK");
 162                         }
 163
 164                         break;
 165                 }
 166
 167                 case 'G':
 168                         for(int i = 0; i < 16; i++) {
 169                                 char str[9] = {0};
 170                                 strncpy(str, &packet[1 + i * 8], 8);
 171                                 uint32_t reg = strtoul(str, NULL, 16);
 172                                 stlink_write_reg(sl, ntohl(reg), i);
 173                         }
 174
 175                         reply = strdup("OK");
 176                         break;
 177
 178                 case 'm': {
 179                         char* s_start = &packet[1];
 180                         char* s_count = strstr(&packet[1], ",") + 1;
 181
 182                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 183                         unsigned     count = strtoul(s_count, NULL, 16);
 184
 185                         unsigned adj_start = start % 4;
 186
 187                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 188                                                 count : count + 4 - (count % 4));
 189
 190                         reply = calloc(count * 2 + 1, 1);
 191                         for(int i = 0; i < count; i++) {
 192                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 193                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 194                         }
 195
 196                         break;
 197                 }
 198
 199                 case 'M': {
 200                         char* s_start = &packet[1];
 201                         char* s_count = strstr(&packet[1], ",") + 1;
 202                         char* hexdata = strstr(packet, ":") + 1;
 203
 204                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 205                         unsigned     count = strtoul(s_count, NULL, 16);
 206
 207                         for(int i = 0; i < count; i ++) {
 208                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 209                                 uint8_t byte = strtoul(hex, NULL, 16);
 210                                 sl->q_buf[i] = byte;
 211                         }
 212
 213                         if((count % 4) == 0 && (start % 4) == 0) {
 214                                 stlink_write_mem32(sl, start, count);
 215                         } else {
 216                                 stlink_write_mem8(sl, start, count);
 217                         }
 218
 219                         reply = strdup("OK");
 220
 221                         break;
 222                 }
 223
 224                 default:
 225                         reply = strdup("");
 226                 }
 227
 228                 if(reply) {
 229                         //printf("send: %s\n", reply);
 230
 231                         int result = gdb_send_packet(client, reply);
 232                         if(result != 0) {
 233                                 fprintf(stderr, "cannot send: %d\n", result);
 234                                 return 1;
 235                         }
 236
 237                         free(reply);
 238                 }
 239
 240                 free(packet);
 241         }
 242
 243         return 0;
 244 }