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riscv-openocd/src/server/gdb_server.c

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/***************************************************************************
* 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"
#include "flash.h"
#include "target_request.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", 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;
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 (character == '#') break;
if (character == '}')
{
/* data transmitted in binary mode (X packet)
* uses 0x7d as escape character */
my_checksum += character & 0xff;
if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
return retval;
my_checksum += character & 0xff;
buffer[count++] = (character ^ 0x20) & 0xff;
}
else
{
my_checksum += character & 0xff;
buffer[count++] = character & 0xff;
}
if (count > *len)
{
ERROR("packet buffer too small");
return ERROR_GDB_BUFFER_TOO_SMALL;
}
} while (1);
*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;
gdb_connection->vflash_image = NULL;
/* 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)
{
gdb_service_t *gdb_service = connection->service->priv;
gdb_connection_t *gdb_connection = connection->priv;
/* see if an image built with vFlash commands is left */
if (gdb_connection->vflash_image)
{
image_close(gdb_connection->vflash_image);
free(gdb_connection->vflash_image);
gdb_connection->vflash_image = NULL;
}
/* if this connection registered a debug-message receiver delete it */
delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
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, &reg_list, &reg_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, &reg_list, &reg_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, &reg_list, &reg_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, &reg_list, &reg_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 = BKPT_SOFT /* dummy init to avoid warning */;
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_v_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
{
gdb_connection_t *gdb_connection = connection->priv;
gdb_service_t *gdb_service = connection->service->priv;
int result;
if (strstr(packet, "vFlashErase:"))
{
unsigned long addr;
unsigned long length;
char *parse = packet + 12;
if (*parse == '\0')
{
ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
addr = strtoul(parse, &parse, 16);
if (*(parse++) != ',' || *parse == '\0')
{
ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
length = strtoul(parse, &parse, 16);
if (*parse != '\0')
{
ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
/* perform erase */
if ((result = flash_erase(gdb_service->target, addr, length)) != ERROR_OK)
{
/* GDB doesn't evaluate the actual error number returned,
* treat a failed erase as an I/O error
*/
gdb_send_error(connection, EIO);
ERROR("flash_erase returned %i", result);
}
else
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
if (strstr(packet, "vFlashWrite:"))
{
unsigned long addr;
unsigned long length;
char *parse = packet + 12;
if (*parse == '\0')
{
ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
addr = strtoul(parse, &parse, 16);
if (*(parse++) != ':')
{
ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
length = packet_size - (parse - packet);
/* create a new image if there isn't already one */
if (gdb_connection->vflash_image == NULL)
{
gdb_connection->vflash_image = malloc(sizeof(image_t));
image_open(gdb_connection->vflash_image, "", "build");
}
/* create new section with content from packet buffer */
image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (u8*)parse);
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
if (!strcmp(packet, "vFlashDone"))
{
u32 image_size;
char *error_str;
u32 *failed = malloc(sizeof(u32) * gdb_connection->vflash_image->num_sections);
/* process the flashing buffer */
if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &image_size, &error_str, failed)) != ERROR_OK)
{
if (result == ERROR_FLASH_DST_OUT_OF_BANK)
gdb_put_packet(connection, "E.memtype", 9);
else
gdb_send_error(connection, EIO);
ERROR("flash writing failed: %s", error_str);
free(error_str);
}
else
{
DEBUG("wrote %u bytes from vFlash image to flash", image_size);
gdb_put_packet(connection, "OK", 2);
}
free(failed);
image_close(gdb_connection->vflash_image);
free(gdb_connection->vflash_image);
gdb_connection->vflash_image = NULL;
return ERROR_OK;
}
gdb_put_packet(connection, "", 0);
return ERROR_OK;
}
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 'v':
retval = gdb_v_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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