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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007-2010 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2011 by Broadcom Corporation *
* Evan Hunter - ehunter@broadcom.com *
* *
* Copyright (C) ST-Ericsson SA 2011 *
* michel.jaouen@stericsson.com : smp minimum support *
* *
* Copyright (C) 2013 Andes Technology *
* Hsiangkai Wang <hkwang@andestech.com> *
* *
* Copyright (C) 2013 Franck Jullien *
* elec4fun@gmail.com *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <target/breakpoints.h>
#include <target/target_request.h>
#include <target/register.h>
#include <target/target.h>
#include <target/target_type.h>
#include <target/semihosting_common.h>
#include "server.h"
#include <flash/nor/core.h>
#include "gdb_server.h"
#include <target/image.h>
#include <jtag/jtag.h>
#include "rtos/rtos.h"
#include "target/smp.h"
/**
* @file
* GDB server implementation.
*
* This implements the GDB Remote Serial Protocol, over TCP connections,
* giving GDB access to the JTAG or other hardware debugging facilities
* found in most modern embedded processors.
*/
enum gdb_output_flag {
/* GDB doesn't accept 'O' packets */
GDB_OUTPUT_NO,
/* GDB doesn't accept 'O' packets but accepts notifications */
GDB_OUTPUT_NOTIF,
/* GDB accepts 'O' packets */
GDB_OUTPUT_ALL,
};
struct target_desc_format {
char *tdesc;
uint32_t tdesc_length;
};
/* private connection data for GDB */
struct gdb_connection {
char buffer[GDB_BUFFER_SIZE + 1]; /* Extra byte for null-termination */
char *buf_p;
int buf_cnt;
bool ctrl_c;
enum target_state frontend_state;
struct image *vflash_image;
bool closed;
/* set to prevent re-entrance from log messages during gdb_get_packet()
* and gdb_put_packet(). */
bool busy;
int noack_mode;
/* set flag to true if you want the next stepi to return immediately.
* allowing GDB to pick up a fresh set of register values from the target
* without modifying the target state. */
bool sync;
/* We delay reporting memory write errors until next step/continue or memory
* write. This improves performance of gdb load significantly as the GDB packet
* can be replied immediately and a new GDB packet will be ready without delay
* (ca. 10% or so...). */
bool mem_write_error;
/* with extended-remote it seems we need to better emulate attach/detach.
* what this means is we reply with a W stop reply after a kill packet,
* normally we reply with a S reply via gdb_last_signal_packet.
* as a side note this behaviour only effects gdb > 6.8 */
bool attached;
/* set when extended protocol is used */
bool extended_protocol;
/* temporarily used for target description support */
struct target_desc_format target_desc;
/* temporarily used for thread list support */
char *thread_list;
/* flag to mask the output from gdb_log_callback() */
enum gdb_output_flag output_flag;
/* Unique index for this GDB connection. */
unsigned int unique_index;
};
#if 0
#define _DEBUG_GDB_IO_
#endif
static struct gdb_connection *current_gdb_connection;
static int gdb_breakpoint_override;
static enum breakpoint_type gdb_breakpoint_override_type;
static int gdb_error(struct connection *connection, int retval);
static char *gdb_port;
static char *gdb_port_next;
static void gdb_log_callback(void *priv, const char *file, unsigned line,
const char *function, const char *string);
static void gdb_sig_halted(struct connection *connection);
/* number of gdb connections, mainly to suppress gdb related debugging spam
* in helper/log.c when no gdb connections are actually active */
static int gdb_actual_connections;
/* set if we are sending a memory map to gdb
* via qXfer:memory-map:read packet */
/* enabled by default*/
static bool gdb_use_memory_map = true;
/* enabled by default*/
static bool gdb_flash_program = true;
/* 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.
* Disabled by default.
*/
static int gdb_report_data_abort;
/* If set, errors when accessing registers are reported to gdb. Disabled by
* default. */
static int gdb_report_register_access_error;
/* set if we are sending target descriptions to gdb
* via qXfer:features:read packet */
/* enabled by default */
static bool gdb_use_target_description = true;
/* current processing free-run type, used by file-I/O */
static char gdb_running_type;
static int gdb_last_signal(struct target *target)
{
LOG_TARGET_DEBUG(target, "Debug reason is: %s",
target_debug_reason_str(target->debug_reason));
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_EXC_CATCH:
return 0x05;
case DBG_REASON_NOTHALTED:
return 0x0; /* no signal... shouldn't happen */
default:
LOG_USER("undefined debug reason %d (%s) - target needs reset",
target->debug_reason,
target_debug_reason_str(target->debug_reason));
return 0x0;
}
}
static int check_pending(struct connection *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;
struct gdb_connection *gdb_con = connection->priv;
int t;
if (!got_data)
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 (socket_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;
}
static int gdb_get_char_inner(struct connection *connection, int *next_char)
{
struct gdb_connection *gdb_con = connection->priv;
int retval = ERROR_OK;
#ifdef _DEBUG_GDB_IO_
char *debug_buffer;
#endif
for (;; ) {
if (connection->service->type != CONNECTION_TCP)
gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
else {
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) {
LOG_DEBUG("GDB connection closed by the remote client");
gdb_con->closed = true;
return ERROR_SERVER_REMOTE_CLOSED;
}
#ifdef _WIN32
bool retry = (WSAGetLastError() == WSAEWOULDBLOCK);
#else
bool retry = (errno == EAGAIN);
#endif
if (retry) {
// Try again after a delay
usleep(1000);
} else {
// Print error and close the socket
log_socket_error("GDB");
gdb_con->closed = true;
return ERROR_SERVER_REMOTE_CLOSED;
}
}
#ifdef _DEBUG_GDB_IO_
debug_buffer = strndup(gdb_con->buffer, gdb_con->buf_cnt);
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 = true;
else
connection->input_pending = false;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif
return retval;
}
/**
* The cool thing about this fn is that it allows buf_p and buf_cnt to be
* held in registers in the inner loop.
*
* For small caches and embedded systems this is important!
*/
static inline int gdb_get_char_fast(struct connection *connection,
int *next_char, char **buf_p, int *buf_cnt)
{
int retval = ERROR_OK;
if ((*buf_cnt)-- > 0) {
*next_char = **buf_p;
(*buf_p)++;
if (*buf_cnt > 0)
connection->input_pending = true;
else
connection->input_pending = false;
#ifdef _DEBUG_GDB_IO_
LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif
return ERROR_OK;
}
struct gdb_connection *gdb_con = connection->priv;
gdb_con->buf_p = *buf_p;
gdb_con->buf_cnt = *buf_cnt;
retval = gdb_get_char_inner(connection, next_char);
*buf_p = gdb_con->buf_p;
*buf_cnt = gdb_con->buf_cnt;
return retval;
}
static int gdb_get_char(struct connection *connection, int *next_char)
{
struct gdb_connection *gdb_con = connection->priv;
return gdb_get_char_fast(connection, next_char, &gdb_con->buf_p, &gdb_con->buf_cnt);
}
static int gdb_putback_char(struct connection *connection, int last_char)
{
struct gdb_connection *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! */
static int gdb_write(struct connection *connection, void *data, int len)
{
struct gdb_connection *gdb_con = connection->priv;
if (gdb_con->closed) {
LOG_DEBUG("GDB socket marked as closed, cannot write to it.");
return ERROR_SERVER_REMOTE_CLOSED;
}
if (connection_write(connection, data, len) == len)
return ERROR_OK;
LOG_WARNING("Error writing to GDB socket. Dropping the connection.");
gdb_con->closed = true;
return ERROR_SERVER_REMOTE_CLOSED;
}
static void gdb_log_incoming_packet(struct connection *connection, char *packet)
{
if (!LOG_LEVEL_IS(LOG_LVL_DEBUG))
return;
struct target *target = get_target_from_connection(connection);
struct gdb_connection *gdb_connection = connection->priv;
/* Avoid dumping non-printable characters to the terminal */
const unsigned packet_len = strlen(packet);
const char *nonprint = find_nonprint_char(packet, packet_len);
if (nonprint) {
/* Does packet at least have a prefix that is printable?
* Look within the first 50 chars of the packet. */
const char *colon = memchr(packet, ':', MIN(50, packet_len));
const bool packet_has_prefix = (colon);
const bool packet_prefix_printable = (packet_has_prefix && nonprint > colon);
if (packet_prefix_printable) {
const unsigned int prefix_len = colon - packet + 1; /* + 1 to include the ':' */
const unsigned int payload_len = packet_len - prefix_len;
LOG_TARGET_DEBUG(target, "{%d} received packet: %.*s<binary-data-%u-bytes>",
gdb_connection->unique_index, prefix_len, packet, payload_len);
} else {
LOG_TARGET_DEBUG(target, "{%d} received packet: <binary-data-%u-bytes>",
gdb_connection->unique_index, packet_len);
}
} else {
/* All chars printable, dump the packet as is */
LOG_TARGET_DEBUG(target, "{%d} received packet: %s", gdb_connection->unique_index, packet);
}
}
static void gdb_log_outgoing_packet(struct connection *connection, char *packet_buf,
unsigned int packet_len, unsigned char checksum)
{
if (!LOG_LEVEL_IS(LOG_LVL_DEBUG))
return;
struct target *target = get_target_from_connection(connection);
struct gdb_connection *gdb_connection = connection->priv;
if (find_nonprint_char(packet_buf, packet_len))