|
- /***************************************************************************
- * Copyright (C) 2005 by Dominic Rath *
- * Dominic.Rath@gmx.de *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "replacements.h"
-
- #include "gdb_server.h"
-
- #include "server.h"
- #include "log.h"
- #include "binarybuffer.h"
- #include "breakpoints.h"
-
- #define __USE_GNU
- #include <string.h>
- #include <errno.h>
- #include <unistd.h>
- #include <stdlib.h>
-
- #if 0
- #define _DEBUG_GDB_IO_
- #endif
-
- static unsigned short gdb_port;
-
- int gdb_last_signal(target_t *target)
- {
- switch (target->debug_reason)
- {
- case DBG_REASON_DBGRQ:
- return 0x2; /* SIGINT */
- case DBG_REASON_BREAKPOINT:
- case DBG_REASON_WATCHPOINT:
- case DBG_REASON_WPTANDBKPT:
- return 0x05; /* SIGTRAP */
- case DBG_REASON_SINGLESTEP:
- return 0x05; /* SIGTRAP */
- case DBG_REASON_NOTHALTED:
- return 0x0; /* no signal... shouldn't happen */
- default:
- ERROR("BUG: undefined debug reason");
- exit(-1);
- }
- }
-
- int gdb_get_char(connection_t *connection, int* next_char)
- {
- gdb_connection_t *gdb_con = connection->priv;
- char *debug_buffer;
-
- if (gdb_con->buf_cnt-- > 0)
- {
- *next_char = *(gdb_con->buf_p++);
- if (gdb_con->buf_cnt > 0)
- connection->input_pending = 1;
- else
- connection->input_pending = 0;
-
- #ifdef _DEBUG_GDB_IO_
- DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
- #endif
-
- return ERROR_OK;
- }
-
- while ((gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE)) <= 0)
- {
- if (gdb_con->buf_cnt == 0)
- return ERROR_SERVER_REMOTE_CLOSED;
-
- #ifdef _WIN32
- errno = WSAGetLastError();
-
- switch(errno)
- {
- case WSAEWOULDBLOCK:
- usleep(1000);
- break;
- case WSAECONNABORTED:
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- ERROR("read: %d", strerror(errno));
- exit(-1);
- }
- #else
- switch(errno)
- {
- case EAGAIN:
- usleep(1000);
- break;
- case ECONNABORTED:
- return ERROR_SERVER_REMOTE_CLOSED;
- case ECONNRESET:
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- ERROR("read: %s", strerror(errno));
- exit(-1);
- }
- #endif
- }
-
- debug_buffer = malloc(gdb_con->buf_cnt + 1);
- memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt);
- debug_buffer[gdb_con->buf_cnt] = 0;
- DEBUG("received '%s'", debug_buffer);
- free(debug_buffer);
-
- gdb_con->buf_p = gdb_con->buffer;
- gdb_con->buf_cnt--;
- *next_char = *(gdb_con->buf_p++);
- if (gdb_con->buf_cnt > 0)
- connection->input_pending = 1;
- else
- connection->input_pending = 0;
- #ifdef _DEBUG_GDB_IO_
- DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
- #endif
-
- return ERROR_OK;
- }
-
- int gdb_putback_char(connection_t *connection, int last_char)
- {
- gdb_connection_t *gdb_con = connection->priv;
-
- if (gdb_con->buf_p > gdb_con->buffer)
- {
- *(--gdb_con->buf_p) = last_char;
- gdb_con->buf_cnt++;
- }
- else
- {
- ERROR("BUG: couldn't put character back");
- }
-
- return ERROR_OK;
- }
-
- int gdb_put_packet(connection_t *connection, char *buffer, int len)
- {
- int i;
- unsigned char my_checksum = 0;
- char checksum[3];
- char *debug_buffer;
- int reply;
- int retval;
- gdb_connection_t *gdb_con = connection->priv;
-
- for (i = 0; i < len; i++)
- my_checksum += buffer[i];
-
- while (1)
- {
-
- debug_buffer = malloc(len + 1);
- memcpy(debug_buffer, buffer, len);
- debug_buffer[len] = 0;
- DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
- free(debug_buffer);
-
- write_socket(connection->fd, "$", 1);
- if (len > 0)
- write_socket(connection->fd, buffer, len);
- write_socket(connection->fd, "#", 1);
-
- snprintf(checksum, 3, "%2.2x", my_checksum);
-
- write_socket(connection->fd, checksum, 2);
-
- if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
- return retval;
-
- if (reply == '+')
- break;
- else if (reply == '-')
- WARNING("negative reply, retrying");
- else if (reply == 0x3)
- {
- gdb_con->ctrl_c = 1;
- if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
- return retval;
- if (reply == '+')
- break;
- else if (reply == '-')
- WARNING("negative reply, retrying");
- else
- {
- ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
- return ERROR_SERVER_REMOTE_CLOSED;
- }
- }
- else
- {
- ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
- return ERROR_SERVER_REMOTE_CLOSED;
- }
- }
-
- return ERROR_OK;
- }
-
- int gdb_get_packet(connection_t *connection, char *buffer, int *len)
- {
- int character;
- int count = 0;
- int retval;
- int first_char = 0;
- int packet_type;
- char checksum[3];
- unsigned char my_checksum = 0;
- gdb_connection_t *gdb_con = connection->priv;
-
- while (1)
- {
- do
- {
- if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
- return retval;
-
- DEBUG("character: '%c'", character);
-
- switch (character)
- {
- case '$':
- break;
- case '+':
- WARNING("acknowledgment received, but no packet pending");
- break;
- case '-':
- WARNING("negative acknowledgment, but no packet pending");
- break;
- case 0x3:
- gdb_con->ctrl_c = 1;
- *len = 0;
- return ERROR_OK;
- default:
- WARNING("ignoring character 0x%x", character);
- break;
- }
- } while (character != '$');
-
- my_checksum = 0;
-
- do
- {
- if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
- return retval;
-
- if( !first_char ) {
- packet_type = character;
- first_char = 1;
- }
-
- if( packet_type == 'X' )
- {
- switch (character)
- {
- case '#':
- break;
- case 0x7d:
- /* data transmitted in binary mode (X packet)
- * uses 0x7d as escape character */
- my_checksum += character & 0xff;
- gdb_get_char(connection, &character);
- my_checksum += character & 0xff;
- buffer[count++] = (character ^ 0x20) & 0xff;
- if (count > *len)
- {
- ERROR("packet buffer too small");
- return ERROR_GDB_BUFFER_TOO_SMALL;
- }
- break;
- default:
- buffer[count++] = character & 0xff;
- my_checksum += character & 0xff;
- if (count > *len)
- {
- ERROR("packet buffer too small");
- return ERROR_GDB_BUFFER_TOO_SMALL;
- }
- break;
- }
- }
- else
- {
- switch (character)
- {
- case '#':
- break;
- case 0x3:
- gdb_con->ctrl_c = 1;
- break;
- default:
- buffer[count++] = character & 0xff;
- my_checksum += character & 0xff;
- if (count > *len)
- {
- ERROR("packet buffer too small");
- return ERROR_GDB_BUFFER_TOO_SMALL;
- }
- break;
- }
- }
- } while (character != '#');
-
- *len = count;
-
- if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
- return retval;
- checksum[0] = character;
- if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
- return retval;
- checksum[1] = character;
- checksum[2] = 0;
-
- if (my_checksum == strtoul(checksum, NULL, 16))
- {
- write_socket(connection->fd, "+", 1);
- break;
- }
-
- WARNING("checksum error, requesting retransmission");
- write_socket(connection->fd, "-", 1);
- }
-
- return ERROR_OK;
- }
-
- int gdb_output(struct command_context_s *context, char* line)
- {
- connection_t *connection = context->output_handler_priv;
- char *hex_buffer;
- int i, bin_size;
-
- bin_size = strlen(line);
-
- hex_buffer = malloc(bin_size*2 + 4);
-
- hex_buffer[0] = 'O';
- for (i=0; i<bin_size; i++)
- snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
- hex_buffer[bin_size*2+1] = '0';
- hex_buffer[bin_size*2+2] = 'a';
- hex_buffer[bin_size*2+3] = 0x0;
-
- gdb_put_packet(connection, hex_buffer, bin_size*2 + 3);
-
- free(hex_buffer);
- return ERROR_OK;
- }
-
- int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
- {
- connection_t *connection = priv;
- gdb_connection_t *gdb_connection = connection->priv;
- char sig_reply[4];
- int signal;
-
- switch (event)
- {
- case TARGET_EVENT_HALTED:
- if (gdb_connection->frontend_state == TARGET_RUNNING)
- {
- if (gdb_connection->ctrl_c)
- {
- signal = 0x2;
- gdb_connection->ctrl_c = 0;
- }
- else
- {
- signal = gdb_last_signal(target);
- }
-
- snprintf(sig_reply, 4, "T%2.2x", signal);
- gdb_put_packet(connection, sig_reply, 3);
- gdb_connection->frontend_state = TARGET_HALTED;
- }
- break;
- case TARGET_EVENT_RESUMED:
- if (gdb_connection->frontend_state == TARGET_HALTED)
- {
- gdb_connection->frontend_state = TARGET_RUNNING;
- }
- break;
- default:
- break;
- }
-
- return ERROR_OK;
- }
-
- int gdb_new_connection(connection_t *connection)
- {
- gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t));
- gdb_service_t *gdb_service = connection->service->priv;
- int retval;
- int initial_ack;
-
- connection->priv = gdb_connection;
-
- /* initialize gdb connection information */
- gdb_connection->buf_p = gdb_connection->buffer;
- gdb_connection->buf_cnt = 0;
- gdb_connection->ctrl_c = 0;
- gdb_connection->frontend_state = TARGET_HALTED;
-
- /* output goes through gdb connection */
- command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
-
- /* register callback to be informed about target events */
- target_register_event_callback(gdb_target_callback_event_handler, connection);
-
- /* a gdb session just attached, put the target in halt mode */
- if (((retval = gdb_service->target->type->halt(gdb_service->target)) != ERROR_OK) &&
- (retval != ERROR_TARGET_ALREADY_HALTED))
- {
- ERROR("error when trying to halt target");
- exit(-1);
- }
-
- while (gdb_service->target->state != TARGET_HALTED)
- {
- gdb_service->target->type->poll(gdb_service->target);
- }
-
- /* remove the initial ACK from the incoming buffer */
- if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
- return retval;
-
- if (initial_ack != '+')
- gdb_putback_char(connection, initial_ack);
-
- return ERROR_OK;
- }
-
- int gdb_connection_closed(connection_t *connection)
- {
- if (connection->priv)
- free(connection->priv);
- else
- ERROR("BUG: connection->priv == NULL");
-
- target_unregister_event_callback(gdb_target_callback_event_handler, connection);
-
- return ERROR_OK;
- }
-
- void gdb_send_error(connection_t *connection, u8 the_error)
- {
- char err[4];
- snprintf(err, 4, "E%2.2X", the_error );
- gdb_put_packet(connection, err, 3);
- }
-
- int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
- {
- char sig_reply[4];
- int signal;
-
- signal = gdb_last_signal(target);
-
- snprintf(sig_reply, 4, "S%2.2x", signal);
- gdb_put_packet(connection, sig_reply, 3);
-
- return ERROR_OK;
- }
-
- void gdb_str_to_target(target_t *target, char *str, char *tstr)
- {
- int str_len = strlen(str);
- int i;
-
- if (str_len % 2)
- {
- ERROR("BUG: gdb value with uneven number of characters encountered: %s", str);
- exit(-1);
- }
-
- if (target->endianness == TARGET_LITTLE_ENDIAN)
- {
- for (i = 0; i < str_len; i+=2)
- {
- tstr[str_len - i - 1] = str[i + 1];
- tstr[str_len - i - 2] = str[i];
- }
- }
- else
- {
- for (i = 0; i < str_len; i++)
- {
- tstr[i] = str[i];
- }
- }
- }
-
- void gdb_target_to_str(target_t *target, char *tstr, char *str)
- {
- int str_len = strlen(tstr);
- int i;
-
- if (str_len % 2)
- {
- ERROR("BUG: gdb value with uneven number of characters encountered");
- exit(-1);
- }
-
- if (target->endianness == TARGET_LITTLE_ENDIAN)
- {
- for (i = 0; i < str_len; i+=2)
- {
- str[str_len - i - 1] = tstr[i + 1];
- str[str_len - i - 2] = tstr[i];
- }
- }
- else
- {
- for (i = 0; i < str_len; i++)
- {
- str[i] = tstr[i];
- }
- }
- }
-
- int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
- {
- reg_t **reg_list;
- int reg_list_size;
- int retval;
- int reg_packet_size = 0;
- char *reg_packet;
- char *reg_packet_p;
- int i;
-
- DEBUG("");
-
- if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb requested registers but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- /* this is a bug condition - get_gdb_reg_list() may not return any other error */
- ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
- exit(-1);
- }
- }
-
- for (i = 0; i < reg_list_size; i++)
- {
- reg_packet_size += reg_list[i]->size;
- }
-
- reg_packet = malloc(CEIL(reg_packet_size, 8) * 2);
- reg_packet_p = reg_packet;
-
- for (i = 0; i < reg_list_size; i++)
- {
- char *hex_buf = buf_to_str(reg_list[i]->value, reg_list[i]->size, 16);
- DEBUG("hex_buf: %s", hex_buf);
- gdb_str_to_target(target, hex_buf, reg_packet_p);
- reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
- free(hex_buf);
- }
-
- reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
- DEBUG("reg_packet: %s", reg_packet_p);
- free(reg_packet_p);
-
- gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
- free(reg_packet);
-
- free(reg_list);
-
- return ERROR_OK;
- }
-
- int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- int i;
- reg_t **reg_list;
- int reg_list_size;
- int retval;
- char *packet_p;
-
- DEBUG("");
-
- /* skip command character */
- packet++;
- packet_size--;
-
- if (packet_size % 2)
- {
- WARNING("GDB set_registers packet with uneven characters received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb tried to registers but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- /* this is a bug condition - get_gdb_reg_list() may not return any other error */
- ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
- exit(-1);
- }
- }
-
- packet_p = packet;
- for (i = 0; i < reg_list_size; i++)
- {
- u8 *bin_buf;
- char *hex_buf;
- reg_arch_type_t *arch_type;
-
- /* convert from GDB-string (target-endian) to hex-string (big-endian) */
- hex_buf = malloc(CEIL(reg_list[i]->size, 8) * 2);
- gdb_target_to_str(target, packet_p, hex_buf);
-
- /* convert hex-string to binary buffer */
- bin_buf = malloc(CEIL(reg_list[i]->size, 8));
- str_to_buf(hex_buf, CEIL(reg_list[i]->size, 8) * 2, bin_buf, reg_list[i]->size, 16);
-
- /* get register arch_type, and call set method */
- arch_type = register_get_arch_type(reg_list[i]->arch_type);
- if (arch_type == NULL)
- {
- ERROR("BUG: encountered unregistered arch type");
- exit(-1);
- }
- arch_type->set(reg_list[i], bin_buf);
-
- /* advance packet pointer */
- packet_p += (CEIL(reg_list[i]->size, 8) * 2);
-
- free(bin_buf);
- free(hex_buf);
- }
-
- /* free reg_t *reg_list[] array allocated by get_gdb_reg_list */
- free(reg_list);
-
- gdb_put_packet(connection, "OK", 2);
-
- return ERROR_OK;
- }
-
- int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- char *reg_packet;
- int reg_num = strtoul(packet + 1, NULL, 16);
- reg_t **reg_list;
- int reg_list_size;
- int retval;
- char *hex_buf;
-
- DEBUG("");
-
- if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb requested registers but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- /* this is a bug condition - get_gdb_reg_list() may not return any other error */
- ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
- exit(-1);
- }
- }
-
- if (reg_list_size <= reg_num)
- {
- ERROR("gdb requested a non-existing register");
- exit(-1);
- }
-
- reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
-
- hex_buf = buf_to_str(reg_list[reg_num]->value, reg_list[reg_num]->size, 16);
-
- gdb_str_to_target(target, hex_buf, reg_packet);
-
- gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
-
- free(reg_list);
- free(reg_packet);
- free(hex_buf);
-
- return ERROR_OK;
- }
-
- int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- char *separator;
- char *hex_buf;
- u8 *bin_buf;
- int reg_num = strtoul(packet + 1, &separator, 16);
- reg_t **reg_list;
- int reg_list_size;
- int retval;
- reg_arch_type_t *arch_type;
-
- DEBUG("");
-
- if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb tried to set a register but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- /* this is a bug condition - get_gdb_reg_list() may not return any other error */
- ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
- exit(-1);
- }
- }
-
- if (reg_list_size < reg_num)
- {
- ERROR("gdb requested a non-existing register");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- if (*separator != '=')
- {
- ERROR("GDB 'set register packet', but no '=' following the register number");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- /* convert from GDB-string (target-endian) to hex-string (big-endian) */
- hex_buf = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
- gdb_target_to_str(target, separator + 1, hex_buf);
-
- /* convert hex-string to binary buffer */
- bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
- str_to_buf(hex_buf, CEIL(reg_list[reg_num]->size, 8) * 2, bin_buf, reg_list[reg_num]->size, 16);
-
- /* get register arch_type, and call set method */
- arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
- if (arch_type == NULL)
- {
- ERROR("BUG: encountered unregistered arch type");
- exit(-1);
- }
- arch_type->set(reg_list[reg_num], bin_buf);
-
- gdb_put_packet(connection, "OK", 2);
-
- free(bin_buf);
- free(hex_buf);
- free(reg_list);
-
- return ERROR_OK;
- }
-
- int gdb_memory_packet_error(connection_t *connection, int retval)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb tried to read memory but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- break;
- case ERROR_TARGET_DATA_ABORT:
- gdb_send_error(connection, EIO);
- break;
- case ERROR_TARGET_TRANSLATION_FAULT:
- gdb_send_error(connection, EFAULT);
- break;
- case ERROR_TARGET_UNALIGNED_ACCESS:
- gdb_send_error(connection, EFAULT);
- break;
- default:
- ERROR("BUG: unexpected error %i", retval);
- exit(-1);
- }
-
- return ERROR_OK;
- }
-
- int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- char *separator;
- u32 addr = 0;
- u32 len = 0;
-
- u8 *buffer;
- char *hex_buffer;
-
- int i;
- int retval;
-
- /* skip command character */
- packet++;
-
- addr = strtoul(packet, &separator, 16);
-
- if (*separator != ',')
- {
- ERROR("incomplete read memory packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- len = strtoul(separator+1, NULL, 16);
-
- buffer = malloc(len);
-
- DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
-
- switch (len)
- {
- case 4:
- if ((addr % 4) == 0)
- retval = target->type->read_memory(target, addr, 4, 1, buffer);
- else
- retval = target->type->read_memory(target, addr, 1, len, buffer);
- break;
- case 2:
- if ((addr % 2) == 0)
- retval = target->type->read_memory(target, addr, 2, 1, buffer);
- else
- retval = target->type->read_memory(target, addr, 1, len, buffer);
- break;
- default:
- if (((addr % 4) == 0) && ((len % 4) == 0))
- retval = target->type->read_memory(target, addr, 4, len / 4, buffer);
- else
- retval = target->type->read_memory(target, addr, 1, len, buffer);
- }
-
- if (retval == ERROR_OK)
- {
- hex_buffer = malloc(len * 2 + 1);
-
- for (i=0; i<len; i++)
- snprintf(hex_buffer + 2*i, 3, "%2.2x", buffer[i]);
-
- gdb_put_packet(connection, hex_buffer, len * 2);
-
- free(hex_buffer);
- }
- else
- {
- if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
- return retval;
- }
-
- free(buffer);
-
- return ERROR_OK;
- }
-
- int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- char *separator;
- u32 addr = 0;
- u32 len = 0;
-
- u8 *buffer;
-
- int i;
- int retval;
-
- /* skip command character */
- packet++;
-
- addr = strtoul(packet, &separator, 16);
-
- if (*separator != ',')
- {
- ERROR("incomplete write memory packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- len = strtoul(separator+1, &separator, 16);
-
- if (*(separator++) != ':')
- {
- ERROR("incomplete write memory packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- buffer = malloc(len);
-
- DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
-
- for (i=0; i<len; i++)
- {
- u32 tmp;
- sscanf(separator + 2*i, "%2x", &tmp);
- buffer[i] = tmp;
- }
-
- retval = ERROR_OK;
- switch (len)
- {
- /* handle sized writes */
- case 4:
- if ((addr % 4) == 0)
- retval = target->type->write_memory(target, addr, 4, 1, buffer);
- else
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- case 2:
- if ((addr % 2) == 0)
- retval = target->type->write_memory(target, addr, 2, 1, buffer);
- else
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- case 3:
- case 1:
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- /* handle bulk writes */
- default:
- retval = target_write_buffer(target, addr, len, buffer);
- break;
- }
-
- if (retval == ERROR_OK)
- {
- gdb_put_packet(connection, "OK", 2);
- }
- else
- {
- if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
- return retval;
- }
-
- free(buffer);
-
- return ERROR_OK;
- }
-
- int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- char *separator;
- u32 addr = 0;
- u32 len = 0;
-
- u8 *buffer;
- int retval;
-
- /* skip command character */
- packet++;
-
- addr = strtoul(packet, &separator, 16);
-
- if (*separator != ',')
- {
- ERROR("incomplete write memory binary packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- len = strtoul(separator+1, &separator, 16);
-
- if (*(separator++) != ':')
- {
- ERROR("incomplete write memory binary packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- retval = ERROR_OK;
- if( len ) {
-
- buffer = malloc(len);
-
- DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
-
- memcpy( buffer, separator, len );
-
- switch (len)
- {
- case 4:
- if ((addr % 4) == 0)
- retval = target->type->write_memory(target, addr, 4, 1, buffer);
- else
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- case 2:
- if ((addr % 2) == 0)
- retval = target->type->write_memory(target, addr, 2, 1, buffer);
- else
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- case 3:
- case 1:
- retval = target->type->write_memory(target, addr, 1, len, buffer);
- break;
- default:
- retval = target_write_buffer(target, addr, len, buffer);
- break;
- }
-
- free(buffer);
- }
-
- if (retval == ERROR_OK)
- {
- gdb_put_packet(connection, "OK", 2);
- }
- else
- {
- if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- void gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- int current = 0;
- u32 address = 0x0;
-
- DEBUG("");
-
- if (packet_size > 1)
- {
- packet[packet_size] = 0;
- address = strtoul(packet + 1, NULL, 16);
- }
- else
- {
- current = 1;
- }
-
- if (packet[0] == 'c')
- {
- DEBUG("continue");
- target->type->resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
- }
- else if (packet[0] == 's')
- {
- DEBUG("step");
- target->type->step(target, current, address, 0); /* step at current or address, don't handle breakpoints */
- }
- }
-
- int gdb_bp_wp_packet_error(connection_t *connection, int retval)
- {
- switch (retval)
- {
- case ERROR_TARGET_NOT_HALTED:
- ERROR("gdb tried to set a breakpoint but we're not halted, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- break;
- case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
- gdb_send_error(connection, EBUSY);
- break;
- default:
- ERROR("BUG: unexpected error %i", retval);
- exit(-1);
- }
-
- return ERROR_OK;
- }
-
- int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
- {
- int type;
- enum breakpoint_type bp_type;
- enum watchpoint_rw wp_type;
- u32 address;
- u32 size;
- char *separator;
- int retval;
-
- DEBUG("");
-
- type = strtoul(packet + 1, &separator, 16);
-
- if (type == 0) /* memory breakpoint */
- bp_type = BKPT_SOFT;
- else if (type == 1) /* hardware breakpoint */
- bp_type = BKPT_HARD;
- else if (type == 2) /* write watchpoint */
- wp_type = WPT_WRITE;
- else if (type == 3) /* read watchpoint */
- wp_type = WPT_READ;
- else if (type == 4) /* access watchpoint */
- wp_type = WPT_ACCESS;
-
- if (*separator != ',')
- {
- ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- address = strtoul(separator+1, &separator, 16);
-
- if (*separator != ',')
- {
- ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- size = strtoul(separator+1, &separator, 16);
-
- switch (type)
- {
- case 0:
- case 1:
- if (packet[0] == 'Z')
- {
- if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
- {
- if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
- return retval;
- }
- else
- {
- gdb_put_packet(connection, "OK", 2);
- }
- }
- else
- {
- breakpoint_remove(target, address);
- gdb_put_packet(connection, "OK", 2);
- }
- break;
- case 2:
- case 3:
- case 4:
- {
- if (packet[0] == 'Z')
- {
- if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK)
- {
- if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
- return retval;
- }
- else
- {
- gdb_put_packet(connection, "OK", 2);
- }
- }
- else
- {
- watchpoint_remove(target, address);
- gdb_put_packet(connection, "OK", 2);
- }
- break;
- }
- default:
- break;
- }
-
- return ERROR_OK;
- }
-
- void gdb_query_packet(connection_t *connection, char *packet, int packet_size)
- {
- command_context_t *cmd_ctx = connection->cmd_ctx;
-
- if (strstr(packet, "qRcmd,"))
- {
- if (packet_size > 6)
- {
- char *cmd;
- int i;
- cmd = malloc((packet_size - 6)/2 + 1);
- for (i=0; i < (packet_size - 6)/2; i++)
- {
- u32 tmp;
- sscanf(packet + 6 + 2*i, "%2x", &tmp);
- cmd[i] = tmp;
- }
- cmd[(packet_size - 6)/2] = 0x0;
- command_run_line(cmd_ctx, cmd);
- free(cmd);
- }
- gdb_put_packet(connection, "OK", 2);
- return;
- }
-
- gdb_put_packet(connection, "", 0);
- }
-
- int gdb_input(connection_t *connection)
- {
- gdb_service_t *gdb_service = connection->service->priv;
- target_t *target = gdb_service->target;
- char packet[GDB_BUFFER_SIZE];
- int packet_size;
- int retval;
- gdb_connection_t *gdb_con = connection->priv;
-
- /* drain input buffer */
- do
- {
- packet_size = GDB_BUFFER_SIZE-1;
- if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK)
- {
- switch (retval)
- {
- case ERROR_GDB_BUFFER_TOO_SMALL:
- ERROR("BUG: buffer supplied for gdb packet was too small");
- exit(-1);
- case ERROR_SERVER_REMOTE_CLOSED:
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- ERROR("BUG: unexpected error");
- exit(-1);
- }
- }
-
- /* terminate with zero */
- packet[packet_size] = 0;
-
- DEBUG("recevied packet: '%s'", packet);
-
- if (packet_size > 0)
- {
- retval = ERROR_OK;
- switch (packet[0])
- {
- case 'H':
- /* Hct... -- set thread
- * we don't have threads, send empty reply */
- gdb_put_packet(connection, NULL, 0);
- break;
- case 'q':
- gdb_query_packet(connection, packet, packet_size);
- break;
- case 'g':
- retval = gdb_get_registers_packet(connection, target, packet, packet_size);
- break;
- case 'G':
- retval = gdb_set_registers_packet(connection, target, packet, packet_size);
- break;
- case 'p':
- retval = gdb_get_register_packet(connection, target, packet, packet_size);
- break;
- case 'P':
- retval = gdb_set_register_packet(connection, target, packet, packet_size);
- break;
- case 'm':
- retval = gdb_read_memory_packet(connection, target, packet, packet_size);
- break;
- case 'M':
- retval = gdb_write_memory_packet(connection, target, packet, packet_size);
- break;
- case 'z':
- case 'Z':
- retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
- break;
- case '?':
- gdb_last_signal_packet(connection, target, packet, packet_size);
- break;
- case 'c':
- case 's':
- gdb_step_continue_packet(connection, target, packet, packet_size);
- break;
- case 'D':
- target->type->resume(target, 1, 0, 1, 0);
- gdb_put_packet(connection, "OK", 2);
- break;
- case 'X':
- if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
- return retval;
- break;
- case 'k':
- gdb_put_packet(connection, "OK", 2);
- return ERROR_SERVER_REMOTE_CLOSED;
- default:
- /* ignore unkown packets */
- DEBUG("ignoring 0x%2.2x packet", packet[0]);
- gdb_put_packet(connection, NULL, 0);
- break;
- }
-
- /* if a packet handler returned an error, exit input loop */
- if (retval != ERROR_OK)
- return retval;
- }
-
- if (gdb_con->ctrl_c)
- {
- if (target->state == TARGET_RUNNING)
- {
- target->type->halt(target);
- gdb_con->ctrl_c = 0;
- }
- }
-
- } while (gdb_con->buf_cnt > 0);
-
- return ERROR_OK;
- }
-
- int gdb_init()
- {
- gdb_service_t *gdb_service;
- target_t *target = targets;
- int i = 0;
-
- if (!target)
- {
- WARNING("no gdb ports allocated as no target has been specified");
- return ERROR_OK;
- }
-
- if (gdb_port == 0)
- {
- WARNING("no gdb port specified, using default port 3333");
- gdb_port = 3333;
- }
-
- while (target)
- {
- char service_name[8];
-
- snprintf(service_name, 8, "gdb-%2.2i", i);
-
- gdb_service = malloc(sizeof(gdb_service_t));
- gdb_service->target = target;
-
- add_service("gdb", CONNECTION_GDB, gdb_port + i, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);
-
- DEBUG("gdb service for target %s at port %i", target->type->name, gdb_port + i);
-
- i++;
- target = target->next;
- }
-
- return ERROR_OK;
- }
-
- /* daemon configuration command gdb_port */
- int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
- {
- if (argc == 0)
- return ERROR_OK;
-
- /* only if the port wasn't overwritten by cmdline */
- if (gdb_port == 0)
- gdb_port = strtoul(args[0], NULL, 0);
-
- return ERROR_OK;
- }
-
- int gdb_register_commands(command_context_t *command_context)
- {
- register_command(command_context, NULL, "gdb_port", handle_gdb_port_command,
- COMMAND_CONFIG, "");
-
- return ERROR_OK;
- }
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