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530 lines
11 KiB
C
530 lines
11 KiB
C
/* Serial interface for local (hardwired) serial ports on Un*x like systems
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Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "serial.h"
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#include "ser-base.h"
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#include "ser-unix.h"
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#include <fcntl.h>
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#include <sys/types.h>
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#include "terminal.h"
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#include <sys/socket.h>
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#include "gdbsupport/gdb_sys_time.h"
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#include "gdb_select.h"
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#include "gdbcmd.h"
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#include "gdbsupport/filestuff.h"
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#include <termios.h>
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#include "inflow.h"
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struct hardwire_ttystate
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{
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struct termios termios;
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};
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#ifdef CRTSCTS
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/* Boolean to explicitly enable or disable h/w flow control. */
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static bool serial_hwflow;
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static void
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show_serial_hwflow (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Hardware flow control is %s.\n"), value);
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}
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#endif
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static int hardwire_open (struct serial *scb, const char *name);
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static void hardwire_raw (struct serial *scb);
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static int rate_to_code (int rate);
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static int hardwire_setbaudrate (struct serial *scb, int rate);
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static int hardwire_setparity (struct serial *scb, int parity);
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static void hardwire_close (struct serial *scb);
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static int get_tty_state (struct serial *scb,
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struct hardwire_ttystate * state);
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static int set_tty_state (struct serial *scb,
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struct hardwire_ttystate * state);
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static serial_ttystate hardwire_get_tty_state (struct serial *scb);
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static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);
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static void hardwire_print_tty_state (struct serial *, serial_ttystate,
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struct ui_file *);
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static int hardwire_drain_output (struct serial *);
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static int hardwire_flush_output (struct serial *);
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static int hardwire_flush_input (struct serial *);
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static int hardwire_send_break (struct serial *);
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static int hardwire_setstopbits (struct serial *, int);
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/* Open up a real live device for serial I/O. */
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static int
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hardwire_open (struct serial *scb, const char *name)
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{
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scb->fd = gdb_open_cloexec (name, O_RDWR, 0);
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if (scb->fd < 0)
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return -1;
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return 0;
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}
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static int
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get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
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{
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if (tcgetattr (scb->fd, &state->termios) < 0)
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return -1;
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return 0;
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}
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static int
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set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
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{
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if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
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return -1;
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return 0;
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}
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static serial_ttystate
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hardwire_get_tty_state (struct serial *scb)
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{
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struct hardwire_ttystate *state = XNEW (struct hardwire_ttystate);
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if (get_tty_state (scb, state))
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{
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xfree (state);
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return NULL;
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}
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return (serial_ttystate) state;
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}
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static serial_ttystate
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hardwire_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
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{
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struct hardwire_ttystate *state = XNEW (struct hardwire_ttystate);
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*state = *(struct hardwire_ttystate *) ttystate;
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return (serial_ttystate) state;
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}
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static int
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hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
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{
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struct hardwire_ttystate *state;
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state = (struct hardwire_ttystate *) ttystate;
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return set_tty_state (scb, state);
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}
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static void
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hardwire_print_tty_state (struct serial *scb,
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serial_ttystate ttystate,
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struct ui_file *stream)
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{
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struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
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int i;
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fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
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(int) state->termios.c_iflag,
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(int) state->termios.c_oflag);
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fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
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(int) state->termios.c_cflag,
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(int) state->termios.c_lflag);
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#if 0
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/* This not in POSIX, and is not really documented by those systems
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which have it (at least not Sun). */
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fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
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#endif
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fprintf_filtered (stream, "c_cc: ");
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for (i = 0; i < NCCS; i += 1)
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fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
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fprintf_filtered (stream, "\n");
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}
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/* Wait for the output to drain away, as opposed to flushing
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(discarding) it. */
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static int
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hardwire_drain_output (struct serial *scb)
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{
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/* Ignore SIGTTOU which may occur during the drain. */
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scoped_ignore_sigttou ignore_sigttou;
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return tcdrain (scb->fd);
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}
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static int
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hardwire_flush_output (struct serial *scb)
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{
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return tcflush (scb->fd, TCOFLUSH);
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}
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static int
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hardwire_flush_input (struct serial *scb)
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{
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ser_base_flush_input (scb);
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return tcflush (scb->fd, TCIFLUSH);
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}
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static int
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hardwire_send_break (struct serial *scb)
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{
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return tcsendbreak (scb->fd, 0);
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}
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static void
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hardwire_raw (struct serial *scb)
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{
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struct hardwire_ttystate state;
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if (get_tty_state (scb, &state))
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fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n",
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safe_strerror (errno));
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state.termios.c_iflag = 0;
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state.termios.c_oflag = 0;
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state.termios.c_lflag = 0;
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state.termios.c_cflag &= ~CSIZE;
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state.termios.c_cflag |= CLOCAL | CS8;
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#ifdef CRTSCTS
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/* h/w flow control. */
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if (serial_hwflow)
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state.termios.c_cflag |= CRTSCTS;
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else
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state.termios.c_cflag &= ~CRTSCTS;
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#ifdef CRTS_IFLOW
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if (serial_hwflow)
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state.termios.c_cflag |= CRTS_IFLOW;
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else
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state.termios.c_cflag &= ~CRTS_IFLOW;
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#endif
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#endif
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state.termios.c_cc[VMIN] = 0;
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state.termios.c_cc[VTIME] = 0;
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if (set_tty_state (scb, &state))
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fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n",
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safe_strerror (errno));
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}
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#ifndef B19200
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#define B19200 EXTA
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#endif
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#ifndef B38400
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#define B38400 EXTB
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#endif
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/* Translate baud rates from integers to damn B_codes. Unix should
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have outgrown this crap years ago, but even POSIX wouldn't buck it. */
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static struct
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{
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int rate;
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int code;
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}
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baudtab[] =
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{
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{
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50, B50
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}
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,
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{
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75, B75
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}
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,
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{
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110, B110
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}
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,
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{
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134, B134
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}
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,
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{
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150, B150
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}
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,
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{
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200, B200
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}
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,
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{
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300, B300
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}
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,
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{
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600, B600
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}
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,
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{
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1200, B1200
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}
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,
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{
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1800, B1800
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}
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,
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{
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2400, B2400
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}
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,
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{
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4800, B4800
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}
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,
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{
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9600, B9600
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}
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,
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{
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19200, B19200
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}
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,
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{
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38400, B38400
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}
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,
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#ifdef B57600
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{
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57600, B57600
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}
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,
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#endif
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#ifdef B115200
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{
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115200, B115200
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}
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,
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#endif
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#ifdef B230400
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{
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230400, B230400
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}
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,
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#endif
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#ifdef B460800
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{
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460800, B460800
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}
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,
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#endif
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{
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-1, -1
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}
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,
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};
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static int
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rate_to_code (int rate)
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{
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int i;
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for (i = 0; baudtab[i].rate != -1; i++)
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{
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/* test for perfect macth. */
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if (rate == baudtab[i].rate)
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return baudtab[i].code;
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else
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{
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/* check if it is in between valid values. */
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if (rate < baudtab[i].rate)
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{
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if (i)
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{
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warning (_("Invalid baud rate %d. "
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"Closest values are %d and %d."),
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rate, baudtab[i - 1].rate, baudtab[i].rate);
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}
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else
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{
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warning (_("Invalid baud rate %d. Minimum value is %d."),
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rate, baudtab[0].rate);
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}
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return -1;
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}
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}
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}
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/* The requested speed was too large. */
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warning (_("Invalid baud rate %d. Maximum value is %d."),
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rate, baudtab[i - 1].rate);
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return -1;
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}
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static int
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hardwire_setbaudrate (struct serial *scb, int rate)
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{
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struct hardwire_ttystate state;
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int baud_code = rate_to_code (rate);
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if (baud_code < 0)
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{
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/* The baud rate was not valid.
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A warning has already been issued. */
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errno = EINVAL;
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return -1;
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}
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if (get_tty_state (scb, &state))
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return -1;
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cfsetospeed (&state.termios, baud_code);
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cfsetispeed (&state.termios, baud_code);
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return set_tty_state (scb, &state);
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}
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static int
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hardwire_setstopbits (struct serial *scb, int num)
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{
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struct hardwire_ttystate state;
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int newbit;
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if (get_tty_state (scb, &state))
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return -1;
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switch (num)
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{
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case SERIAL_1_STOPBITS:
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newbit = 0;
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break;
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case SERIAL_1_AND_A_HALF_STOPBITS:
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case SERIAL_2_STOPBITS:
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newbit = 1;
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break;
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default:
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return 1;
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}
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if (!newbit)
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state.termios.c_cflag &= ~CSTOPB;
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else
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state.termios.c_cflag |= CSTOPB; /* two bits */
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return set_tty_state (scb, &state);
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}
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/* Implement the "setparity" serial_ops callback. */
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static int
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hardwire_setparity (struct serial *scb, int parity)
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{
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struct hardwire_ttystate state;
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int newparity = 0;
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if (get_tty_state (scb, &state))
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return -1;
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switch (parity)
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{
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case GDBPARITY_NONE:
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newparity = 0;
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break;
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case GDBPARITY_ODD:
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newparity = PARENB | PARODD;
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break;
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case GDBPARITY_EVEN:
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newparity = PARENB;
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break;
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default:
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internal_warning (__FILE__, __LINE__,
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"Incorrect parity value: %d", parity);
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return -1;
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}
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state.termios.c_cflag &= ~(PARENB | PARODD);
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state.termios.c_cflag |= newparity;
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return set_tty_state (scb, &state);
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}
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static void
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hardwire_close (struct serial *scb)
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{
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if (scb->fd < 0)
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return;
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close (scb->fd);
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scb->fd = -1;
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}
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/* The hardwire ops. */
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static const struct serial_ops hardwire_ops =
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{
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"hardwire",
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hardwire_open,
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hardwire_close,
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NULL,
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ser_base_readchar,
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ser_base_write,
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hardwire_flush_output,
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hardwire_flush_input,
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hardwire_send_break,
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hardwire_raw,
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hardwire_get_tty_state,
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hardwire_copy_tty_state,
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hardwire_set_tty_state,
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hardwire_print_tty_state,
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hardwire_setbaudrate,
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hardwire_setstopbits,
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hardwire_setparity,
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hardwire_drain_output,
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ser_base_async,
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ser_unix_read_prim,
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ser_unix_write_prim
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};
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void
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_initialize_ser_hardwire (void)
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{
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serial_add_interface (&hardwire_ops);
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#ifdef CRTSCTS
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add_setshow_boolean_cmd ("remoteflow", no_class,
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&serial_hwflow, _("\
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Set use of hardware flow control for remote serial I/O."), _("\
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Show use of hardware flow control for remote serial I/O."), _("\
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Enable or disable hardware flow control (RTS/CTS) on the serial port\n\
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when debugging using remote targets."),
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NULL,
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show_serial_hwflow,
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&setlist, &showlist);
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#endif
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}
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int
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ser_unix_read_prim (struct serial *scb, size_t count)
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{
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return read (scb->fd, scb->buf, count);
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}
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int
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ser_unix_write_prim (struct serial *scb, const void *buf, size_t len)
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{
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return write (scb->fd, buf, len);
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}
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