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gdb_server.c 50.44 KiB
/***************************************************************************
* 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 "jtag.h"
#include "breakpoints.h"
#include "flash.h"
#include "target_request.h"
#include "configuration.h"
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#if 0
#define _DEBUG_GDB_IO_
#endif
extern int gdb_error(connection_t *connection, int retval);
static unsigned short gdb_port;
static const char *DIGITS = "0123456789abcdef";
static void gdb_log_callback(void *priv, const char *file, int line,
const char *function, const char *string);
enum gdb_detach_mode
{
GDB_DETACH_RESUME,
GDB_DETACH_RESET,
GDB_DETACH_HALT,
GDB_DETACH_NOTHING
};
/* target behaviour on gdb detach */
enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME;
/* set if we are sending a memory map to gdb
* via qXfer:memory-map:read packet */
/* enabled by default*/
int gdb_use_memory_map = 1;
/* enabled by default*/
int gdb_flash_program = 1;
/* if set, data aborts cause an error to be reported in memory read packets
* see the code in gdb_read_memory_packet() for further explanations */
int gdb_report_data_abort = 0;
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:
LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
return 0x0;
}
}
int check_pending(connection_t *connection, int timeout_s, int *got_data)
{
/* a non-blocking socket will block if there is 0 bytes available on the socket,
* but return with as many bytes as are available immediately
*/
struct timeval tv;
fd_set read_fds;
gdb_connection_t *gdb_con = connection->priv;
int t;
if (got_data==NULL)
got_data=&t;
*got_data=0;
if (gdb_con->buf_cnt>0)
{
*got_data = 1;
return ERROR_OK;
}
FD_ZERO(&read_fds);
FD_SET(connection->fd, &read_fds);
tv.tv_sec = timeout_s;
tv.tv_usec = 0;
if (select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0)
{
/* This can typically be because a "monitor" command took too long
* before printing any progress messages
*/
if (timeout_s>0)
{
return ERROR_GDB_TIMEOUT;
} else
{
return ERROR_OK;
}
}
*got_data=FD_ISSET(connection->fd, &read_fds)!=0;
return ERROR_OK;
}
int gdb_get_char(connection_t *connection, int* next_char)
{
gdb_connection_t *gdb_con = connection->priv;
int retval=ERROR_OK;
#ifdef _DEBUG_GDB_IO_
char *debug_buffer;
#endif
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_
LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif
return ERROR_OK;
}
for (;;)
{
retval=check_pending(connection, 1, NULL);
if (retval!=ERROR_OK)
return retval;
gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
if (gdb_con->buf_cnt > 0)
{
break;
}
if (gdb_con->buf_cnt == 0)
{
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
}
#ifdef _WIN32
errno = WSAGetLastError();
switch(errno)
{
case WSAEWOULDBLOCK:
usleep(1000);
break;
case WSAECONNABORTED:
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
case WSAECONNRESET:
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
default:
LOG_ERROR("read: %d", errno);
exit(-1);
}
#else
switch(errno)
{
case EAGAIN:
usleep(1000);
break;
case ECONNABORTED:
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
case ECONNRESET:
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
default:
LOG_ERROR("read: %s", strerror(errno));
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
}#endif
}
#ifdef _DEBUG_GDB_IO_
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;
LOG_DEBUG("received '%s'", debug_buffer);
free(debug_buffer);
#endif
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_
LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif
return retval;
}
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
{
LOG_ERROR("BUG: couldn't put character back");
}
return ERROR_OK;
}
/* The only way we can detect that the socket is closed is the first time
* we write to it, we will fail. Subsequent write operations will
* succeed. Shudder! */
int gdb_write(connection_t *connection, void *data, int len)
{
gdb_connection_t *gdb_con = connection->priv;
if (gdb_con->closed)
return ERROR_SERVER_REMOTE_CLOSED;
if (write_socket(connection->fd, data, len) == len)
{
return ERROR_OK;
}
gdb_con->closed = 1;
return ERROR_SERVER_REMOTE_CLOSED;
}
int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
{
int i;
unsigned char my_checksum = 0;
#ifdef _DEBUG_GDB_IO_
char *debug_buffer;
#endif
int reply;
int retval;
gdb_connection_t *gdb_con = connection->priv;
for (i = 0; i < len; i++)
my_checksum += buffer[i];
#ifdef _DEBUG_GDB_IO_
/*
* At this point we should have nothing in the input queue from GDB,
* however sometimes '-' is sent even though we've already received
* an ACK (+) for everything we've sent off.
*/
#ifndef _WIN32
int gotdata;
for (;;)
{
if ((retval=check_pending(connection, 0, &gotdata))!=ERROR_OK)
return retval;
if (!gotdata)
break;
if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
return retval;
LOG_WARNING("Discard unexpected char %c", reply);
}
#endif
#endif
while (1)
{
#ifdef _DEBUG_GDB_IO_
debug_buffer = malloc(len + 1);
memcpy(debug_buffer, buffer, len);
debug_buffer[len] = 0;
LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
free(debug_buffer);
#endif
char local_buffer[1024];
local_buffer[0] = '$';
if (len+4 <= sizeof(local_buffer))
{
/* performance gain on smaller packets by only a single call to gdb_write() */
memcpy(local_buffer+1, buffer, len++);
local_buffer[len++] = '#';
local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
local_buffer[len++] = DIGITS[my_checksum & 0xf];
gdb_write(connection, local_buffer, len);
}
else
{
/* larger packets are transmitted directly from caller supplied buffer
by several calls to gdb_write() to avoid dynamic allocation */
local_buffer[1] = '#';
local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
local_buffer[3] = DIGITS[my_checksum & 0xf];
gdb_write(connection, local_buffer, 1);
gdb_write(connection, buffer, len);
gdb_write(connection, local_buffer+1, 3);
}
if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
return retval;
if (reply == '+')
break;
else if (reply == '-')
{
/* Stop sending output packets for now */
log_remove_callback(gdb_log_callback, connection);
LOG_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 == '-')
{
/* Stop sending output packets for now */
log_remove_callback(gdb_log_callback, connection);
LOG_WARNING("negative reply, retrying");
}
else
{
LOG_ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
gdb_con->closed=1;
return ERROR_SERVER_REMOTE_CLOSED;
}
}
else
{
LOG_ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
gdb_con->closed=1;
return ERROR_SERVER_REMOTE_CLOSED;
}
}
if (gdb_con->closed)
return ERROR_SERVER_REMOTE_CLOSED;
return ERROR_OK;
}
int gdb_put_packet(connection_t *connection, char *buffer, int len)
{
gdb_connection_t *gdb_con = connection->priv;
gdb_con->busy = 1;
int retval = gdb_put_packet_inner(connection, buffer, len);
gdb_con->busy = 0;
return retval;
}
int gdb_get_packet_inner(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;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("character: '%c'", character);
#endif
switch (character)
{
case '$':
break;
case '+':
LOG_WARNING("acknowledgment received, but no packet pending");
break;
case '-':
LOG_WARNING("negative acknowledgment, but no packet pending");
break; case 0x3:
gdb_con->ctrl_c = 1;
*len = 0;
return ERROR_OK;
default:
LOG_WARNING("ignoring character 0x%x", character);
break;
}
} while (character != '$');
my_checksum = 0;
count = 0;
gdb_connection_t *gdb_con = connection->priv;
for (;;)
{
/* The common case is that we have an entire packet with no escape chars.
* We need to leave at least 2 bytes in the buffer to have
* gdb_get_char() update various bits and bobs correctly.
*/
if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt+count) < *len))
{
/* The compiler will struggle a bit with constant propagation and
* aliasing, so we help it by showing that these values do not
* change inside the loop
*/
int i;
char *buf = gdb_con->buf_p;
int run = gdb_con->buf_cnt - 2;
i = 0;
int done = 0;
while (i < run)
{
character = *buf++;
i++;
if (character == '#')
{
/* Danger! character can be '#' when esc is
* used so we need an explicit boolean for done here.
*/
done = 1;
break;
}
if (character == '}')
{
/* data transmitted in binary mode (X packet)
* uses 0x7d as escape character */
my_checksum += character & 0xff;
character = *buf++;
i++;
my_checksum += character & 0xff;
buffer[count++] = (character ^ 0x20) & 0xff;
} else
{
my_checksum += character & 0xff;
buffer[count++] = character & 0xff;
}
}
gdb_con->buf_p += i;
gdb_con->buf_cnt -= i;
if (done)
break;
}
if (count > *len)
{
LOG_ERROR("packet buffer too small");
return ERROR_GDB_BUFFER_TOO_SMALL;
}
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;
}
}
*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))
{
gdb_write(connection, "+", 1);
break;
}
LOG_WARNING("checksum error, requesting retransmission");
gdb_write(connection, "-", 1);
}
if (gdb_con->closed)
return ERROR_SERVER_REMOTE_CLOSED;
return ERROR_OK;
}
int gdb_get_packet(connection_t *connection, char *buffer, int *len)
{
gdb_connection_t *gdb_con = connection->priv;
gdb_con->busy = 1;
int retval = gdb_get_packet_inner(connection, buffer, len);
gdb_con->busy = 0;
return retval;
}
int gdb_output_con(connection_t *connection, const char* line)
{
char *hex_buffer;
int i, bin_size;
bin_size = strlen(line);
hex_buffer = malloc(bin_size*2 + 2);
if (hex_buffer == NULL)
return ERROR_GDB_BUFFER_TOO_SMALL;
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;
gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
free(hex_buffer);
return ERROR_OK;
}
int gdb_output(struct command_context_s *context, char* line)
{
/* this will be dumped to the log and also sent as an O packet if possible */
LOG_USER_N("%s", line);
return ERROR_OK;
}
int gdb_program_handler(struct target_s *target, enum target_event event, void *priv)
{
FILE *script;
struct command_context_s *cmd_ctx = priv;
if (target->gdb_program_script)
{
script = open_file_from_path(target->gdb_program_script, "r");
if (!script)
{
LOG_ERROR("couldn't open script file %s", target->gdb_program_script);
return ERROR_OK;
}
LOG_INFO("executing gdb_program script '%s'", target->gdb_program_script);
command_run_file(cmd_ctx, script, COMMAND_EXEC);
fclose(script);
jtag_execute_queue();
}
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:
/* In the GDB protocol when we are stepping or coninuing execution,
* we have a lingering reply. Upon receiving a halted event
* when we have that lingering packet, we reply to the original
* step or continue packet.
*
* Executing monitor commands can bring the target in and
* out of the running state so we'll see lots of TARGET_EVENT_XXX
* that are to be ignored.
*/
if (gdb_connection->frontend_state == TARGET_RUNNING)
{
/* stop forwarding log packets! */
log_remove_callback(gdb_log_callback, connection);
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_GDB_PROGRAM:
gdb_program_handler(target, event, connection->cmd_ctx);
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;
gdb_connection->closed = 0;
gdb_connection->busy = 0;
/* send ACK to GDB for debug request */
gdb_write(connection, "+", 1);
/* 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, try to put the target in halt mode.
*
* DANGER!!!!
*
* If the halt fails(e.g. target needs a reset, JTAG communication not
* working, etc.), then the GDB connect will succeed as
* the get_gdb_reg_list() will lie and return a register list with
* dummy values.
*
* This allows GDB monitor commands to be run from a GDB init script to
* initialize the target
*
* Also, since the halt() is asynchronous target connect will be
* instantaneous and thus avoiding annoying timeout problems during
* connect.
*/
target_halt(gdb_service->target);
/* remove the initial ACK from the incoming buffer */
if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
return retval;
/* FIX!!!??? would we actually ever receive a + here???
* Not observed.
*/
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);
connection->priv = NULL;
}
else
{
LOG_ERROR("BUG: connection->priv == NULL");
}
target_unregister_event_callback(gdb_target_callback_event_handler, connection);
log_remove_callback(gdb_log_callback, 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;
}
/* Convert register to string of bits. NB! The # of bits in the
* register might be non-divisible by 8(a byte), in which
* case an entire byte is shown. */
void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg)
{
int i;
u8 *buf;
int buf_len; buf = reg->value;
buf_len = CEIL(reg->size, 8);
for (i = 0; i < buf_len; i++)
{
tstr[i*2] = DIGITS[(buf[i]>>4) & 0xf];
tstr[i*2+1] = DIGITS[buf[i]&0xf];
}
}
void gdb_target_to_str(target_t *target, char *tstr, char *str)
{
int str_len = strlen(tstr);
int i;
if (str_len % 2)
{
LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
exit(-1);
}
for (i = 0; i < str_len; i+=2)
{
str[str_len - i - 1] = tstr[i + 1];
str[str_len - i - 2] = 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;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("-");
#endif
if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
{
return gdb_error(connection, retval);
}
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++)
{
gdb_str_to_target(target, reg_packet_p, reg_list[i]);
reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
}
#ifdef _DEBUG_GDB_IO_
{
char *reg_packet_p;
reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
LOG_DEBUG("reg_packet: %s", reg_packet_p);
free(reg_packet_p);
}
#endif
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;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("-");
#endif
/* skip command character */
packet++;
packet_size--;
if (packet_size % 2)
{
LOG_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)
{
return gdb_error(connection, retval);
}
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)
{
LOG_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;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("-");
#endif
if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
{
return gdb_error(connection, retval);
}
if (reg_list_size <= reg_num)
{
LOG_ERROR("gdb requested a non-existing register");
exit(-1);
}
reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
free(reg_list);
free(reg_packet);
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;
LOG_DEBUG("-");
if ((retval = target->type->get_gdb_reg_list(target, ®_list, ®_list_size)) != ERROR_OK)
{
return gdb_error(connection, retval);
}
if (reg_list_size < reg_num)
{
LOG_ERROR("gdb requested a non-existing register");
return ERROR_SERVER_REMOTE_CLOSED;
}
if (*separator != '=')
{
LOG_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)
{
LOG_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_error(connection_t *connection, int retval)
{
switch (retval)
{
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;
case ERROR_TARGET_NOT_HALTED:
gdb_send_error(connection, EFAULT);
break;
default:
/* This could be that the target reset itself. */
LOG_ERROR("unexpected error %i", retval);
gdb_send_error(connection, EFAULT);
break;
}
return ERROR_OK;
}
/* We don't have to worry about the default 2 second timeout for GDB packets,
* because GDB breaks up large memory reads into smaller reads.
*
* 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
*/
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 retval = ERROR_OK;
/* skip command character */
packet++;
addr = strtoul(packet, &separator, 16);
if (*separator != ',')
{
LOG_ERROR("incomplete read memory packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
len = strtoul(separator+1, NULL, 16);
buffer = malloc(len);
LOG_DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
retval = target_read_buffer(target, addr, len, buffer);
if ((retval == ERROR_TARGET_DATA_ABORT) && (!gdb_report_data_abort))
{
/* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
* At some point this might be fixed in GDB, in which case this code can be removed.
*
* OpenOCD developers are acutely aware of this problem, but there is nothing
* gained by involving the user in this problem that hopefully will get resolved
* eventually
*
* http://sourceware.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=2395
*
* For now, the default is to fix up things to make current GDB versions work.
* This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
*/
memset(buffer, 0, len);
retval = ERROR_OK;
}
if (retval == ERROR_OK)
{
hex_buffer = malloc(len * 2 + 1);
int i;
for (i = 0; i < len; i++)
{
u8 t = buffer[i];
hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
}
gdb_put_packet(connection, hex_buffer, len * 2);
free(hex_buffer);
}
else
{
retval = gdb_error(connection, retval);
}
free(buffer);
return retval;
}
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 != ',')
{
LOG_ERROR("incomplete write memory packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
len = strtoul(separator+1, &separator, 16);
if (*(separator++) != ':')
{
LOG_ERROR("incomplete write memory packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
buffer = malloc(len);
LOG_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 = target_write_buffer(target, addr, len, buffer);
if (retval == ERROR_OK)
{
gdb_put_packet(connection, "OK", 2);
}
else
{
retval = gdb_error(connection, retval);
}
free(buffer);
return retval;
}
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;
int retval;
/* skip command character */
packet++;
addr = strtoul(packet, &separator, 16);
if (*separator != ',')
{
LOG_ERROR("incomplete write memory binary packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
len = strtoul(separator+1, &separator, 16);
if (*(separator++) != ':')
{ LOG_ERROR("incomplete write memory binary packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
retval = ERROR_OK;
if (len)
{
LOG_DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
retval = target_write_buffer(target, addr, len, (u8*)separator);
}
if (retval == ERROR_OK)
{
gdb_put_packet(connection, "OK", 2);
}
else
{
if ((retval = gdb_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;
LOG_DEBUG("-");
if (packet_size > 1)
{
packet[packet_size] = 0;
address = strtoul(packet + 1, NULL, 16);
}
else
{
current = 1;
}
if (packet[0] == 'c')
{
LOG_DEBUG("continue");
target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
}
else if (packet[0] == 's')
{
LOG_DEBUG("step");
target->type->step(target, current, address, 0); /* step at current or address, don't handle breakpoints */
}
}
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;
LOG_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 != ',')
{
LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
address = strtoul(separator+1, &separator, 16);
if (*separator != ',')
{
LOG_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_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_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;
}
/* print out a string and allocate more space as needed, mainly used for XML at this point */
void xml_printf(int *retval, char **xml, int *pos, int *size, const char *fmt, ...)
{
if (*retval != ERROR_OK)
{
return;
}
int first = 1;
for (;;)
{
if ((*xml == NULL) || (!first))
{
/* start by 0 to exercise all the code paths.
* Need minimum 2 bytes to fit 1 char and 0 terminator. */
*size = *size * 2 + 2;
char *t = *xml;
*xml = realloc(*xml, *size);
if (*xml == NULL)
{
if (t)
free(t);
*retval = ERROR_SERVER_REMOTE_CLOSED;
return;
}
}
va_list ap;
int ret;
va_start(ap, fmt);
ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
va_end(ap);
if ((ret > 0) && ((ret + 1) < *size - *pos))
{
*pos += ret;
return;
}
/* there was just enough or not enough space, allocate more. */
first = 0;
}
}
static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
{
char *separator;
/* Extract and NUL-terminate the annex. */
*annex = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
/* After the read marker and annex, qXfer looks like a
* traditional 'm' packet. */
*ofs = strtoul(buf, &separator, 16);
if (*separator != ',')
return -1;
*len = strtoul(separator+1, NULL, 16);
return 0;
}
int gdb_calc_blocksize(flash_bank_t *bank)
{
int i;
int block_size = 0xffffffff;
/* loop through all sectors and return smallest sector size */
for (i = 0; i < bank->num_sectors; i++)
{
if (bank->sectors[i].size < block_size)
block_size = bank->sectors[i].size;
}
return block_size;
}
static int compare_bank (const void * a, const void * b)
{
flash_bank_t *b1, *b2;
b1=*((flash_bank_t **)a);
b2=*((flash_bank_t **)b);
if (b1->base==b2->base)
{
return 0;
} else if (b1->base>b2->base)
{
return 1;
} else
{
return -1;
}
}
int gdb_query_packet(connection_t *connection, target_t *target, 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;
/* We want to print all debug output to GDB connection */
log_add_callback(gdb_log_callback, connection);
target_call_timer_callbacks_now();
command_run_line(cmd_ctx, cmd);
target_call_timer_callbacks_now();
log_remove_callback(gdb_log_callback, connection);
free(cmd);
}
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
else if (strstr(packet, "qCRC:")) {
if (packet_size > 5)
{
int retval;
char gdb_reply[10];
char *separator;
u32 checksum;
u32 addr = 0;
u32 len = 0;
/* skip command character */
packet += 5;
addr = strtoul(packet, &separator, 16);
if (*separator != ',')
{
LOG_ERROR("incomplete read memory packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
len = strtoul(separator + 1, NULL, 16);
retval = target_checksum_memory(target, addr, len, &checksum);
if (retval == ERROR_OK)
{
snprintf(gdb_reply, 10, "C%8.8x", checksum);
gdb_put_packet(connection, gdb_reply, 9);
}
else
{
if ((retval = gdb_error(connection, retval)) != ERROR_OK)
return retval;
}
return ERROR_OK;
}
}
else if (strstr(packet, "qSupported"))
{
/* we currently support packet size and qXfer:memory-map:read (if enabled)
* disable qXfer:features:read for the moment */
int retval = ERROR_OK;
char *buffer = NULL;
int pos = 0;
int size = 0;
xml_printf(&retval, &buffer, &pos, &size,
"PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-",
(GDB_BUFFER_SIZE - 1), gdb_use_memory_map == 1 ? '+' : '-');
if (retval != ERROR_OK)
{
gdb_send_error(connection, 01);
return ERROR_OK;
}
gdb_put_packet(connection, buffer, strlen(buffer));
free(buffer);
return ERROR_OK;
}
else if (strstr(packet, "qXfer:memory-map:read::"))
{
/* We get away with only specifying flash here. Regions that are not
* specified are treated as if we provided no memory map(if not we
* could detect the holes and mark them as RAM).
* Normally we only execute this code once, but no big deal if we
* have to regenerate it a couple of times. */
flash_bank_t *p;
char *xml = NULL;
int size = 0;
int pos = 0;
int retval = ERROR_OK;
int offset;
int length;
char *separator;
int blocksize;
/* skip command character */
packet += 23;
offset = strtoul(packet, &separator, 16);
length = strtoul(separator + 1, &separator, 16);
xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
/*
sort banks in ascending order, we need to make non-flash memory be ram(or rather
read/write) by default for GDB.
GDB does not have a concept of non-cacheable read/write memory.
*/
flash_bank_t **banks=malloc(sizeof(flash_bank_t *)*flash_get_bank_count());
int i;
for (i=0; i<flash_get_bank_count(); i++)
{
p = get_flash_bank_by_num(i);
if (p == NULL)
{
free(banks);
retval = ERROR_FAIL;
gdb_send_error(connection, retval);
return retval;
}
banks[i]=p;
}
qsort(banks, flash_get_bank_count(), sizeof(flash_bank_t *), compare_bank);
u32 ram_start=0;
for (i=0; i<flash_get_bank_count(); i++)
{
p = banks[i];
if (ram_start<p->base)
{
xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
ram_start, p->base-ram_start);
}
/* if device has uneven sector sizes, eg. str7, lpc
* we pass the smallest sector size to gdb memory map */
blocksize = gdb_calc_blocksize(p);
xml_printf(&retval, &xml, &pos, &size, "<memory type=\"flash\" start=\"0x%x\" length=\"0x%x\">\n" \
"<property name=\"blocksize\">0x%x</property>\n" \
"</memory>\n", \
p->base, p->size, blocksize);
ram_start=p->base+p->size;
}
if (ram_start!=0)
{
xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
ram_start, 0-ram_start);
} else
{ /* a flash chip could be at the very end of the 32 bit address space, in which case
ram_start will be precisely 0 */
}
free(banks);
banks = NULL;
xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
if (retval != ERROR_OK)
{
gdb_send_error(connection, retval);
return retval;
}
if (offset + length > pos)
{
length = pos - offset;
}
char *t = malloc(length + 1);
t[0] = 'l';
memcpy(t + 1, xml + offset, length);
gdb_put_packet(connection, t, length + 1);
free(t);
free(xml);
return ERROR_OK;
}
else if (strstr(packet, "qXfer:features:read:"))
{
char *xml = NULL;
int size = 0;
int pos = 0;
int retval = ERROR_OK;
int offset;
unsigned int length;
char *annex;
/* skip command character */
packet += 20;
if (decode_xfer_read(packet, &annex, &offset, &length) < 0)
{
gdb_send_error(connection, 01);
return ERROR_OK;
}
if (strcmp(annex, "target.xml") != 0)
{
gdb_send_error(connection, 01);
return ERROR_OK;
}
xml_printf(&retval, &xml, &pos, &size, \
"l<target version=\"1.0\">\n<architecture>arm</architecture>\n</target>\n");
if (retval != ERROR_OK)
{
gdb_send_error(connection, retval);
return retval;
}
gdb_put_packet(connection, xml, strlen(xml));
free(xml);
return ERROR_OK;
}
gdb_put_packet(connection, "", 0);
return ERROR_OK;
}
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 flash programming disabled - send a empty reply */
if (gdb_flash_program == 0)
{
gdb_put_packet(connection, "", 0);
return ERROR_OK;
}
if (strstr(packet, "vFlashErase:"))
{
unsigned long addr;
unsigned long length;
char *parse = packet + 12;
if (*parse == '\0')
{
LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
addr = strtoul(parse, &parse, 16);
if (*(parse++) != ',' || *parse == '\0')
{
LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
length = strtoul(parse, &parse, 16);
if (*parse != '\0')
{
LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
/* assume all sectors need erasing - stops any problems
* when flash_write is called multiple times */
flash_set_dirty();
/* perform any target specific operations before the erase */
target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_PROGRAM);
/* perform erase */
if ((result = flash_erase_address_range(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);
LOG_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')
{
LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
return ERROR_SERVER_REMOTE_CLOSED;
}
addr = strtoul(parse, &parse, 16);
if (*(parse++) != ':')
{
LOG_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 written;
/* process the flashing buffer. No need to erase as GDB
* always issues a vFlashErase first. */
if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0)) != ERROR_OK)
{
if (result == ERROR_FLASH_DST_OUT_OF_BANK)
gdb_put_packet(connection, "E.memtype", 9);
else
gdb_send_error(connection, EIO);
}
else
{
LOG_DEBUG("wrote %u bytes from vFlash image to flash", written);
gdb_put_packet(connection, "OK", 2);
}
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_detach(connection_t *connection, target_t *target)
{
switch( detach_mode )
{
case GDB_DETACH_RESUME:
target_resume(target, 1, 0, 1, 0);
break;
case GDB_DETACH_RESET:
target_process_reset(connection->cmd_ctx);
break;
case GDB_DETACH_HALT:
target_halt(target);
break;
case GDB_DETACH_NOTHING:
break;
}
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
static void gdb_log_callback(void *priv, const char *file, int line,
const char *function, const char *string)
{
connection_t *connection = priv;
gdb_connection_t *gdb_con = connection->priv;
if (gdb_con->busy)
{
/* do not reply this using the O packet */
return;
}
gdb_output_con(connection, string);
}
int gdb_input_inner(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;
static int extended_protocol = 0;
/* drain input buffer */
do
{
packet_size = GDB_BUFFER_SIZE-1;
if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK)
{
return retval;
}
/* terminate with zero */
packet[packet_size] = 0;
LOG_DEBUG("received 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':
retval = gdb_query_packet(connection, target, 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':
{
if (target->state != TARGET_HALTED)
{
/* If the target isn't in the halted state, then we can't
* step/continue. This might be early setup, etc.
*/
char sig_reply[4];
snprintf(sig_reply, 4, "T%2.2x", 2);
gdb_put_packet(connection, sig_reply, 3);
} else
{
/* We're running/stepping, in which case we can
* forward log output until the target is halted
*/
gdb_connection_t *gdb_con = connection->priv;
gdb_con->frontend_state = TARGET_RUNNING;
log_add_callback(gdb_log_callback, connection);
gdb_step_continue_packet(connection, target, packet, packet_size);
}
}
break;
case 'v':
retval = gdb_v_packet(connection, target, packet, packet_size);
break;
case 'D':
retval = gdb_detach(connection, target);
extended_protocol = 0;
break;
case 'X':
if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
return retval;
break;
case 'k':
if (extended_protocol != 0)
break;
gdb_put_packet(connection, "OK", 2);
return ERROR_SERVER_REMOTE_CLOSED;
case '!':
/* handle extended remote protocol */
extended_protocol = 1;
gdb_put_packet(connection, "OK", 2);
break;
case 'R':
/* handle extended restart packet */ target_process_reset(connection->cmd_ctx);
break;
default:
/* ignore unkown packets */
LOG_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_halt(target);
gdb_con->ctrl_c = 0;
}
}
} while (gdb_con->buf_cnt > 0);
return ERROR_OK;
}
int gdb_input(connection_t *connection)
{
int retval = gdb_input_inner(connection);
gdb_connection_t *gdb_con = connection->priv;
if (retval == ERROR_SERVER_REMOTE_CLOSED)
return retval;
/* logging does not propagate the error, yet can set th gdb_con->closed flag */
if (gdb_con->closed)
return ERROR_SERVER_REMOTE_CLOSED;
/* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
return ERROR_OK;
}
int gdb_init()
{
gdb_service_t *gdb_service;
target_t *target = targets;
int i = 0;
if (!target)
{
LOG_WARNING("no gdb ports allocated as no target has been specified");
return ERROR_OK;
}
if (gdb_port == 0)
{
LOG_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);
LOG_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 handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc == 1)
{
if (strcmp(args[0], "resume") == 0)
{
detach_mode = GDB_DETACH_RESUME;
return ERROR_OK;
}
else if (strcmp(args[0], "reset") == 0)
{
detach_mode = GDB_DETACH_RESET;
return ERROR_OK;
}
else if (strcmp(args[0], "halt") == 0)
{
detach_mode = GDB_DETACH_HALT;
return ERROR_OK;
}
else if (strcmp(args[0], "nothing") == 0)
{
detach_mode = GDB_DETACH_NOTHING;
return ERROR_OK;
}
}
LOG_WARNING("invalid gdb_detach configuration directive: %s", args[0]);
return ERROR_OK;
}
int handle_gdb_memory_map_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc == 1)
{
if (strcmp(args[0], "enable") == 0)
{
gdb_use_memory_map = 1;
return ERROR_OK;
}
else if (strcmp(args[0], "disable") == 0)
{
gdb_use_memory_map = 0;
return ERROR_OK;
}
}
LOG_WARNING("invalid gdb_memory_map configuration directive: %s", args[0]);
return ERROR_OK;
}
int handle_gdb_flash_program_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc == 1)
{
if (strcmp(args[0], "enable") == 0)
{
gdb_flash_program = 1;
return ERROR_OK;
}
else if (strcmp(args[0], "disable") == 0)
{
gdb_flash_program = 0;
return ERROR_OK;
}
}
LOG_WARNING("invalid gdb_memory_map configuration directive: %s", args[0]);
return ERROR_OK;
}
int handle_gdb_report_data_abort_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc == 1)
{
if (strcmp(args[0], "enable") == 0)
{
gdb_report_data_abort = 1;
return ERROR_OK;
}
else if (strcmp(args[0], "disable") == 0)
{
gdb_report_data_abort = 0;
return ERROR_OK;
}
}
LOG_WARNING("invalid gdb_report_data_abort configuration directive: %s", args[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, "");
register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command,
COMMAND_CONFIG, "");
register_command(command_context, NULL, "gdb_memory_map", handle_gdb_memory_map_command,
COMMAND_CONFIG, "");
register_command(command_context, NULL, "gdb_flash_program", handle_gdb_flash_program_command,
COMMAND_CONFIG, "");
register_command(command_context, NULL, "gdb_report_data_abort", handle_gdb_report_data_abort_command,
COMMAND_CONFIG, "");
return ERROR_OK;
}