binutils-gdb/gdb/serial.c

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/* Generic serial interface routines
Copyright (C) 1992-2019 Free Software Foundation, Inc.
This file is part of GDB.
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include <ctype.h>
#include "serial.h"
#include "gdbcmd.h"
#include "cli/cli-utils.h"
/* Is serial being debugged? */
static unsigned int global_serial_debug_p;
/* Serial I/O handlers. */
static std::vector<const struct serial_ops *> serial_ops_list;
/* Pointer to list of scb's. */
static struct serial *scb_base;
/* Non-NULL gives filename which contains a recording of the remote session,
suitable for playback by gdbserver. */
static char *serial_logfile = NULL;
static struct ui_file *serial_logfp = NULL;
static const struct serial_ops *serial_interface_lookup (const char *);
static void serial_logchar (struct ui_file *stream,
int ch_type, int ch, int timeout);
static const char logbase_hex[] = "hex";
static const char logbase_octal[] = "octal";
static const char logbase_ascii[] = "ascii";
static const char *const logbase_enums[] =
{logbase_hex, logbase_octal, logbase_ascii, NULL};
static const char *serial_logbase = logbase_ascii;
static int serial_current_type = 0;
/* Log char CH of type CHTYPE, with TIMEOUT. */
/* Define bogus char to represent a BREAK. Should be careful to choose a value
that can't be confused with a normal char, or an error code. */
#define SERIAL_BREAK 1235
static void
serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
{
if (ch_type != serial_current_type)
{
fprintf_unfiltered (stream, "\n%c ", ch_type);
serial_current_type = ch_type;
}
if (serial_logbase != logbase_ascii)
fputc_unfiltered (' ', stream);
switch (ch)
{
case SERIAL_TIMEOUT:
fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
return;
case SERIAL_ERROR:
fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
return;
case SERIAL_EOF:
fputs_unfiltered ("<Eof>", stream);
return;
case SERIAL_BREAK:
fputs_unfiltered ("<Break>", stream);
return;
default:
if (serial_logbase == logbase_hex)
fprintf_unfiltered (stream, "%02x", ch & 0xff);
else if (serial_logbase == logbase_octal)
fprintf_unfiltered (stream, "%03o", ch & 0xff);
else
switch (ch)
{
case '\\':
fputs_unfiltered ("\\\\", stream);
break;
case '\b':
fputs_unfiltered ("\\b", stream);
break;
case '\f':
fputs_unfiltered ("\\f", stream);
break;
case '\n':
fputs_unfiltered ("\\n", stream);
break;
case '\r':
fputs_unfiltered ("\\r", stream);
break;
case '\t':
fputs_unfiltered ("\\t", stream);
break;
case '\v':
fputs_unfiltered ("\\v", stream);
break;
default:
fprintf_unfiltered (stream,
isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
break;
}
}
}
void
serial_log_command (struct target_ops *self, const char *cmd)
{
if (!serial_logfp)
return;
serial_current_type = 'c';
fputs_unfiltered ("\nc ", serial_logfp);
fputs_unfiltered (cmd, serial_logfp);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
static const struct serial_ops *
serial_interface_lookup (const char *name)
{
for (const serial_ops *ops : serial_ops_list)
if (strcmp (name, ops->name) == 0)
return ops;
return NULL;
}
void
serial_add_interface (const struct serial_ops *optable)
{
serial_ops_list.push_back (optable);
}
/* Return the open serial device for FD, if found, or NULL if FD is
not already opened. */
struct serial *
serial_for_fd (int fd)
{
struct serial *scb;
for (scb = scb_base; scb; scb = scb->next)
if (scb->fd == fd)
return scb;
return NULL;
}
/* Create a new serial for OPS. */
static struct serial *
new_serial (const struct serial_ops *ops)
{
struct serial *scb;
scb = XCNEW (struct serial);
scb->ops = ops;
scb->bufp = scb->buf;
scb->error_fd = -1;
scb->refcnt = 1;
return scb;
}
static struct serial *serial_open_ops_1 (const struct serial_ops *ops,
const char *open_name);
/* Open up a device or a network socket, depending upon the syntax of NAME. */
struct serial *
serial_open (const char *name)
{
const struct serial_ops *ops;
const char *open_name = name;
if (startswith (name, "|"))
{
ops = serial_interface_lookup ("pipe");
/* Discard ``|'' and any space before the command itself. */
++open_name;
open_name = skip_spaces (open_name);
}
/* Check for a colon, suggesting an IP address/port pair.
Do this *after* checking for all the interesting prefixes. We
don't want to constrain the syntax of what can follow them. */
else if (strchr (name, ':'))
ops = serial_interface_lookup ("tcp");
else
{
#ifndef USE_WIN32API
/* Check to see if name is a socket. If it is, then treat it
as such. Otherwise assume that it's a character device. */
struct stat sb;
if (stat (name, &sb) == 0 && (sb.st_mode & S_IFMT) == S_IFSOCK)
ops = serial_interface_lookup ("local");
else
#endif
ops = serial_interface_lookup ("hardwire");
}
if (!ops)
return NULL;
return serial_open_ops_1 (ops, open_name);
}
/* Open up a serial for OPS, passing OPEN_NAME to the open method. */
static struct serial *
serial_open_ops_1 (const struct serial_ops *ops, const char *open_name)
{
struct serial *scb;
scb = new_serial (ops);
/* `...->open (...)' would get expanded by the open(2) syscall macro. */
if ((*scb->ops->open) (scb, open_name))
{
xfree (scb);
return NULL;
}
scb->next = scb_base;
scb_base = scb;
if (serial_logfile != NULL)
{
stdio_file_up file (new stdio_file ());
if (!file->open (serial_logfile, "w"))
perror_with_name (serial_logfile);
serial_logfp = file.release ();
}
return scb;
}
/* See serial.h. */
struct serial *
serial_open_ops (const struct serial_ops *ops)
{
return serial_open_ops_1 (ops, NULL);
}
/* Open a new serial stream using a file handle, using serial
interface ops OPS. */
static struct serial *
serial_fdopen_ops (const int fd, const struct serial_ops *ops)
{
struct serial *scb;
if (!ops)
{
ops = serial_interface_lookup ("terminal");
if (!ops)
ops = serial_interface_lookup ("hardwire");
}
if (!ops)
return NULL;
scb = new_serial (ops);
scb->next = scb_base;
scb_base = scb;
if ((ops->fdopen) != NULL)
(*ops->fdopen) (scb, fd);
else
scb->fd = fd;
return scb;
}
struct serial *
serial_fdopen (const int fd)
{
return serial_fdopen_ops (fd, NULL);
}
static void
do_serial_close (struct serial *scb, int really_close)
{
struct serial *tmp_scb;
if (serial_logfp)
{
fputs_unfiltered ("\nEnd of log\n", serial_logfp);
serial_current_type = 0;
/* XXX - What if serial_logfp == gdb_stdout or gdb_stderr? */
delete serial_logfp;
serial_logfp = NULL;
}
/* ensure that the FD has been taken out of async mode. */
if (scb->async_handler != NULL)
serial_async (scb, NULL, NULL);
if (really_close)
scb->ops->close (scb);
/* For serial_is_open. */
scb->bufp = NULL;
if (scb_base == scb)
scb_base = scb_base->next;
else
for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
{
if (tmp_scb->next != scb)
continue;
tmp_scb->next = tmp_scb->next->next;
break;
}
serial_unref (scb);
}
void
serial_close (struct serial *scb)
{
do_serial_close (scb, 1);
}
void
serial_un_fdopen (struct serial *scb)
{
do_serial_close (scb, 0);
}
int
serial_is_open (struct serial *scb)
{
return scb->bufp != NULL;
}
void
serial_ref (struct serial *scb)
{
scb->refcnt++;
}
void
serial_unref (struct serial *scb)
{
--scb->refcnt;
if (scb->refcnt == 0)
xfree (scb);
}
int
serial_readchar (struct serial *scb, int timeout)
{
int ch;
/* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
code is finished. */
if (0 && serial_is_async_p (scb) && timeout < 0)
internal_error (__FILE__, __LINE__,
_("serial_readchar: blocking read in async mode"));
ch = scb->ops->readchar (scb, timeout);
if (serial_logfp != NULL)
{
serial_logchar (serial_logfp, 'r', ch, timeout);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
if (serial_debug_p (scb))
{
fprintf_unfiltered (gdb_stdlog, "[");
serial_logchar (gdb_stdlog, 'r', ch, timeout);
fprintf_unfiltered (gdb_stdlog, "]");
gdb_flush (gdb_stdlog);
}
return (ch);
}
int
serial_write (struct serial *scb, const void *buf, size_t count)
{
if (serial_logfp != NULL)
{
const char *str = (const char *) buf;
size_t c;
for (c = 0; c < count; c++)
serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
gdb_flush (serial_logfp);
}
if (serial_debug_p (scb))
{
const char *str = (const char *) buf;
size_t c;
for (c = 0; c < count; c++)
{
fprintf_unfiltered (gdb_stdlog, "[");
serial_logchar (gdb_stdlog, 'w', str[c] & 0xff, 0);
fprintf_unfiltered (gdb_stdlog, "]");
}
gdb_flush (gdb_stdlog);
}
return (scb->ops->write (scb, buf, count));
}
void
serial_printf (struct serial *desc, const char *format, ...)
{
va_list args;
va_start (args, format);
std::string buf = string_vprintf (format, args);
serial_write (desc, buf.c_str (), buf.length ());
va_end (args);
}
int
serial_drain_output (struct serial *scb)
{
return scb->ops->drain_output (scb);
}
int
serial_flush_output (struct serial *scb)
{
return scb->ops->flush_output (scb);
}
int
serial_flush_input (struct serial *scb)
{
return scb->ops->flush_input (scb);
}
int
serial_send_break (struct serial *scb)
{
if (serial_logfp != NULL)
serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
return (scb->ops->send_break (scb));
}
void
serial_raw (struct serial *scb)
{
scb->ops->go_raw (scb);
}
serial_ttystate
serial_get_tty_state (struct serial *scb)
{
return scb->ops->get_tty_state (scb);
}
serial_ttystate
serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
{
return scb->ops->copy_tty_state (scb, ttystate);
}
int
serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
{
return scb->ops->set_tty_state (scb, ttystate);
}
void
serial_print_tty_state (struct serial *scb,
serial_ttystate ttystate,
struct ui_file *stream)
{
scb->ops->print_tty_state (scb, ttystate, stream);
}
int
serial_setbaudrate (struct serial *scb, int rate)
{
return scb->ops->setbaudrate (scb, rate);
}
int
serial_setstopbits (struct serial *scb, int num)
{
return scb->ops->setstopbits (scb, num);
}
/* See serial.h. */
int
serial_setparity (struct serial *scb, int parity)
{
return scb->ops->setparity (scb, parity);
}
int
serial_can_async_p (struct serial *scb)
{
return (scb->ops->async != NULL);
}
int
serial_is_async_p (struct serial *scb)
{
return (scb->ops->async != NULL) && (scb->async_handler != NULL);
}
void
serial_async (struct serial *scb,
serial_event_ftype *handler,
void *context)
{
int changed = ((scb->async_handler == NULL) != (handler == NULL));
scb->async_handler = handler;
scb->async_context = context;
/* Only change mode if there is a need. */
if (changed)
scb->ops->async (scb, handler != NULL);
}
void
serial_debug (struct serial *scb, int debug_p)
{
scb->debug_p = debug_p;
}
int
serial_debug_p (struct serial *scb)
{
return scb->debug_p || global_serial_debug_p;
}
#ifdef USE_WIN32API
void
serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
{
if (scb->ops->wait_handle)
scb->ops->wait_handle (scb, read, except);
else
{
*read = (HANDLE) _get_osfhandle (scb->fd);
*except = NULL;
}
}
void
serial_done_wait_handle (struct serial *scb)
{
if (scb->ops->done_wait_handle)
scb->ops->done_wait_handle (scb);
}
#endif
int
serial_pipe (struct serial *scbs[2])
{
const struct serial_ops *ops;
int fildes[2];
ops = serial_interface_lookup ("pipe");
if (!ops)
{
errno = ENOSYS;
return -1;
}
if (gdb_pipe (fildes) == -1)
return -1;
scbs[0] = serial_fdopen_ops (fildes[0], ops);
scbs[1] = serial_fdopen_ops (fildes[1], ops);
return 0;
}
/* Serial set/show framework. */
static struct cmd_list_element *serial_set_cmdlist;
static struct cmd_list_element *serial_show_cmdlist;
static void
serial_set_cmd (const char *args, int from_tty)
{
printf_unfiltered ("\"set serial\" must be followed "
"by the name of a command.\n");
help_list (serial_set_cmdlist, "set serial ", all_commands, gdb_stdout);
}
static void
serial_show_cmd (const char *args, int from_tty)
{
cmd_show_list (serial_show_cmdlist, from_tty, "");
}
/* Baud rate specified for talking to serial target systems. Default
is left as -1, so targets can choose their own defaults. */
/* FIXME: This means that "show serial baud" and gr_files_info can
print -1 or (unsigned int)-1. This is a Bad User Interface. */
int baud_rate = -1;
static void
serial_baud_show_cmd (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Baud rate for remote serial I/O is %s.\n"),
value);
}
/* Parity for serial port. */
int serial_parity = GDBPARITY_NONE;
static const char parity_none[] = "none";
static const char parity_odd[] = "odd";
static const char parity_even[] = "even";
static const char *const parity_enums[] =
{parity_none, parity_odd, parity_even, NULL};
static const char *parity = parity_none;
/* Set serial_parity value. */
static void
set_parity (const char *ignore_args, int from_tty, struct cmd_list_element *c)
{
if (parity == parity_odd)
serial_parity = GDBPARITY_ODD;
else if (parity == parity_even)
serial_parity = GDBPARITY_EVEN;
else
serial_parity = GDBPARITY_NONE;
}
void
_initialize_serial (void)
{
#if 0
add_com ("connect", class_obscure, connect_command, _("\
Connect the terminal directly up to the command monitor.\n\
Use <CR>~. or <CR>~^D to break out."));
#endif /* 0 */
add_prefix_cmd ("serial", class_maintenance, serial_set_cmd, _("\
Set default serial/parallel port configuration."),
&serial_set_cmdlist, "set serial ",
0/*allow-unknown*/,
&setlist);
add_prefix_cmd ("serial", class_maintenance, serial_show_cmd, _("\
Show default serial/parallel port configuration."),
&serial_show_cmdlist, "show serial ",
0/*allow-unknown*/,
&showlist);
/* If target is open when baud changes, it doesn't take effect until
the next open (I think, not sure). */
add_setshow_zinteger_cmd ("baud", no_class, &baud_rate, _("\
Set baud rate for remote serial I/O."), _("\
Show baud rate for remote serial I/O."), _("\
This value is used to set the speed of the serial port when debugging\n\
using remote targets."),
NULL,
serial_baud_show_cmd,
&serial_set_cmdlist, &serial_show_cmdlist);
add_setshow_enum_cmd ("parity", no_class, parity_enums,
&parity, _("\
Set parity for remote serial I/O"), _("\
Show parity for remote serial I/O"), NULL,
set_parity,
NULL, /* FIXME: i18n: */
&serial_set_cmdlist, &serial_show_cmdlist);
add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
Set filename for remote session recording."), _("\
Show filename for remote session recording."), _("\
This file is used to record the remote session for future playback\n\
by gdbserver."),
NULL,
NULL, /* FIXME: i18n: */
&setlist, &showlist);
add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
&serial_logbase, _("\
Set numerical base for remote session logging"), _("\
Show numerical base for remote session logging"), NULL,
NULL,
NULL, /* FIXME: i18n: */
&setlist, &showlist);
add_setshow_zuinteger_cmd ("serial", class_maintenance,
&global_serial_debug_p, _("\
Set serial debugging."), _("\
Show serial debugging."), _("\
When non-zero, serial port debugging is enabled."),
NULL,
NULL, /* FIXME: i18n: */
&setdebuglist, &showdebuglist);
}