789 lines
17 KiB
C
789 lines
17 KiB
C
/* Serial interface for local (hardwired) serial ports on Un*x like systems
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Copyright (C) 1992-2017 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 "gdb_sys_time.h"
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#include "gdb_select.h"
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#include "gdbcmd.h"
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#include "filestuff.h"
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#ifdef HAVE_TERMIOS
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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 int 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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#endif /* termios */
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#ifdef HAVE_TERMIO
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/* It is believed that all systems which have added job control to SVR3
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(e.g. sco) have also added termios. Even if not, trying to figure out
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all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
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bewildering. So we don't attempt it. */
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struct hardwire_ttystate
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{
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struct termio termio;
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};
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#endif /* termio */
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#ifdef HAVE_SGTTY
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struct hardwire_ttystate
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{
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struct sgttyb sgttyb;
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struct tchars tc;
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struct ltchars ltc;
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/* Line discipline flags. */
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int lmode;
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};
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#endif /* sgtty */
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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 int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,
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serial_ttystate);
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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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void _initialize_ser_hardwire (void);
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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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#ifdef HAVE_TERMIOS
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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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#endif
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#ifdef HAVE_TERMIO
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if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_SGTTY
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if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
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return -1;
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return 0;
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#endif
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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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#ifdef HAVE_TERMIOS
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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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#endif
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#ifdef HAVE_TERMIO
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if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_SGTTY
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if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
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return -1;
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return 0;
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#endif
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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 int
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hardwire_noflush_set_tty_state (struct serial *scb,
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serial_ttystate new_ttystate,
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serial_ttystate old_ttystate)
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{
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struct hardwire_ttystate new_state;
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#ifdef HAVE_SGTTY
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struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
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#endif
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new_state = *(struct hardwire_ttystate *) new_ttystate;
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/* Don't change in or out of raw mode; we don't want to flush input.
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termio and termios have no such restriction; for them flushing input
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is separate from setting the attributes. */
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#ifdef HAVE_SGTTY
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if (state->sgttyb.sg_flags & RAW)
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new_state.sgttyb.sg_flags |= RAW;
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else
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new_state.sgttyb.sg_flags &= ~RAW;
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/* I'm not sure whether this is necessary; the manpage just mentions
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RAW not CBREAK. */
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if (state->sgttyb.sg_flags & CBREAK)
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new_state.sgttyb.sg_flags |= CBREAK;
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else
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new_state.sgttyb.sg_flags &= ~CBREAK;
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#endif
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return set_tty_state (scb, &new_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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#ifdef HAVE_TERMIOS
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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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#endif
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#ifdef HAVE_TERMIO
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fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
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state->termio.c_iflag, state->termio.c_oflag);
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fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
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state->termio.c_cflag, state->termio.c_lflag,
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state->termio.c_line);
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fprintf_filtered (stream, "c_cc: ");
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for (i = 0; i < NCC; i += 1)
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fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
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fprintf_filtered (stream, "\n");
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#endif
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#ifdef HAVE_SGTTY
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fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
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state->sgttyb.sg_flags);
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fprintf_filtered (stream, "tchars: ");
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for (i = 0; i < (int) sizeof (struct tchars); i++)
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fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
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fprintf_filtered (stream, "\n");
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fprintf_filtered (stream, "ltchars: ");
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for (i = 0; i < (int) sizeof (struct ltchars); i++)
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fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
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fprintf_filtered (stream, "\n");
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fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode);
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#endif
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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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#ifdef HAVE_TERMIOS
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return tcdrain (scb->fd);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCSBRK, 1);
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#endif
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#ifdef HAVE_SGTTY
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/* Get the current state and then restore it using TIOCSETP,
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which should cause the output to drain and pending input
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to be discarded. */
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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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{
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return (-1);
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}
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else
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{
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return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
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}
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}
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#endif
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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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#ifdef HAVE_TERMIOS
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return tcflush (scb->fd, TCOFLUSH);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCFLSH, 1);
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#endif
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#ifdef HAVE_SGTTY
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/* This flushes both input and output, but we can't do better. */
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return ioctl (scb->fd, TIOCFLUSH, 0);
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#endif
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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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#ifdef HAVE_TERMIOS
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return tcflush (scb->fd, TCIFLUSH);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCFLSH, 0);
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#endif
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#ifdef HAVE_SGTTY
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/* This flushes both input and output, but we can't do better. */
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return ioctl (scb->fd, TIOCFLUSH, 0);
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#endif
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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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#ifdef HAVE_TERMIOS
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return tcsendbreak (scb->fd, 0);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCSBRK, 0);
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#endif
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#ifdef HAVE_SGTTY
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{
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int status;
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|
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status = ioctl (scb->fd, TIOCSBRK, 0);
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|
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/* Can't use usleep; it doesn't exist in BSD 4.2. */
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/* Note that if this gdb_select() is interrupted by a signal it will not
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wait the full length of time. I think that is OK. */
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gdb_usleep (250000);
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status = ioctl (scb->fd, TIOCCBRK, 0);
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return status;
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}
|
||
#endif
|
||
}
|
||
|
||
static void
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hardwire_raw (struct serial *scb)
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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));
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
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;
|
||
#ifdef CRTSCTS
|
||
/* h/w flow control. */
|
||
if (serial_hwflow)
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state.termios.c_cflag |= CRTSCTS;
|
||
else
|
||
state.termios.c_cflag &= ~CRTSCTS;
|
||
#ifdef CRTS_IFLOW
|
||
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;
|
||
#endif
|
||
#endif
|
||
state.termios.c_cc[VMIN] = 0;
|
||
state.termios.c_cc[VTIME] = 0;
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
state.termio.c_iflag = 0;
|
||
state.termio.c_oflag = 0;
|
||
state.termio.c_lflag = 0;
|
||
state.termio.c_cflag &= ~CSIZE;
|
||
state.termio.c_cflag |= CLOCAL | CS8;
|
||
state.termio.c_cc[VMIN] = 0;
|
||
state.termio.c_cc[VTIME] = 0;
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
state.sgttyb.sg_flags |= RAW | ANYP;
|
||
state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
|
||
#endif
|
||
|
||
if (set_tty_state (scb, &state))
|
||
fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n",
|
||
safe_strerror (errno));
|
||
}
|
||
|
||
#ifndef B19200
|
||
#define B19200 EXTA
|
||
#endif
|
||
|
||
#ifndef B38400
|
||
#define B38400 EXTB
|
||
#endif
|
||
|
||
/* Translate baud rates from integers to damn B_codes. Unix should
|
||
have outgrown this crap years ago, but even POSIX wouldn't buck it. */
|
||
|
||
static struct
|
||
{
|
||
int rate;
|
||
int code;
|
||
}
|
||
baudtab[] =
|
||
{
|
||
{
|
||
50, B50
|
||
}
|
||
,
|
||
{
|
||
75, B75
|
||
}
|
||
,
|
||
{
|
||
110, B110
|
||
}
|
||
,
|
||
{
|
||
134, B134
|
||
}
|
||
,
|
||
{
|
||
150, B150
|
||
}
|
||
,
|
||
{
|
||
200, B200
|
||
}
|
||
,
|
||
{
|
||
300, B300
|
||
}
|
||
,
|
||
{
|
||
600, B600
|
||
}
|
||
,
|
||
{
|
||
1200, B1200
|
||
}
|
||
,
|
||
{
|
||
1800, B1800
|
||
}
|
||
,
|
||
{
|
||
2400, B2400
|
||
}
|
||
,
|
||
{
|
||
4800, B4800
|
||
}
|
||
,
|
||
{
|
||
9600, B9600
|
||
}
|
||
,
|
||
{
|
||
19200, B19200
|
||
}
|
||
,
|
||
{
|
||
38400, B38400
|
||
}
|
||
,
|
||
#ifdef B57600
|
||
{
|
||
57600, B57600
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B115200
|
||
{
|
||
115200, B115200
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B230400
|
||
{
|
||
230400, B230400
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B460800
|
||
{
|
||
460800, B460800
|
||
}
|
||
,
|
||
#endif
|
||
{
|
||
-1, -1
|
||
}
|
||
,
|
||
};
|
||
|
||
static int
|
||
rate_to_code (int rate)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; baudtab[i].rate != -1; i++)
|
||
{
|
||
/* test for perfect macth. */
|
||
if (rate == baudtab[i].rate)
|
||
return baudtab[i].code;
|
||
else
|
||
{
|
||
/* check if it is in between valid values. */
|
||
if (rate < baudtab[i].rate)
|
||
{
|
||
if (i)
|
||
{
|
||
warning (_("Invalid baud rate %d. "
|
||
"Closest values are %d and %d."),
|
||
rate, baudtab[i - 1].rate, baudtab[i].rate);
|
||
}
|
||
else
|
||
{
|
||
warning (_("Invalid baud rate %d. Minimum value is %d."),
|
||
rate, baudtab[0].rate);
|
||
}
|
||
return -1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* The requested speed was too large. */
|
||
warning (_("Invalid baud rate %d. Maximum value is %d."),
|
||
rate, baudtab[i - 1].rate);
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
hardwire_setbaudrate (struct serial *scb, int rate)
|
||
{
|
||
struct hardwire_ttystate state;
|
||
int baud_code = rate_to_code (rate);
|
||
|
||
if (baud_code < 0)
|
||
{
|
||
/* The baud rate was not valid.
|
||
A warning has already been issued. */
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
if (get_tty_state (scb, &state))
|
||
return -1;
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
cfsetospeed (&state.termios, baud_code);
|
||
cfsetispeed (&state.termios, baud_code);
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
#ifndef CIBAUD
|
||
#define CIBAUD CBAUD
|
||
#endif
|
||
|
||
state.termio.c_cflag &= ~(CBAUD | CIBAUD);
|
||
state.termio.c_cflag |= baud_code;
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
state.sgttyb.sg_ispeed = baud_code;
|
||
state.sgttyb.sg_ospeed = baud_code;
|
||
#endif
|
||
|
||
return set_tty_state (scb, &state);
|
||
}
|
||
|
||
static int
|
||
hardwire_setstopbits (struct serial *scb, int num)
|
||
{
|
||
struct hardwire_ttystate state;
|
||
int newbit;
|
||
|
||
if (get_tty_state (scb, &state))
|
||
return -1;
|
||
|
||
switch (num)
|
||
{
|
||
case SERIAL_1_STOPBITS:
|
||
newbit = 0;
|
||
break;
|
||
case SERIAL_1_AND_A_HALF_STOPBITS:
|
||
case SERIAL_2_STOPBITS:
|
||
newbit = 1;
|
||
break;
|
||
default:
|
||
return 1;
|
||
}
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
if (!newbit)
|
||
state.termios.c_cflag &= ~CSTOPB;
|
||
else
|
||
state.termios.c_cflag |= CSTOPB; /* two bits */
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
if (!newbit)
|
||
state.termio.c_cflag &= ~CSTOPB;
|
||
else
|
||
state.termio.c_cflag |= CSTOPB; /* two bits */
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
return 0; /* sgtty doesn't support this */
|
||
#endif
|
||
|
||
return set_tty_state (scb, &state);
|
||
}
|
||
|
||
/* Implement the "setparity" serial_ops callback. */
|
||
|
||
static int
|
||
hardwire_setparity (struct serial *scb, int parity)
|
||
{
|
||
struct hardwire_ttystate state;
|
||
int newparity = 0;
|
||
|
||
if (get_tty_state (scb, &state))
|
||
return -1;
|
||
|
||
switch (parity)
|
||
{
|
||
case GDBPARITY_NONE:
|
||
newparity = 0;
|
||
break;
|
||
case GDBPARITY_ODD:
|
||
newparity = PARENB | PARODD;
|
||
break;
|
||
case GDBPARITY_EVEN:
|
||
newparity = PARENB;
|
||
break;
|
||
default:
|
||
internal_warning (__FILE__, __LINE__,
|
||
"Incorrect parity value: %d", parity);
|
||
return -1;
|
||
}
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
state.termios.c_cflag &= ~(PARENB | PARODD);
|
||
state.termios.c_cflag |= newparity;
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
state.termio.c_cflag &= ~(PARENB | PARODD);
|
||
state.termio.c_cflag |= newparity;
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
return 0; /* sgtty doesn't support this */
|
||
#endif
|
||
return set_tty_state (scb, &state);
|
||
}
|
||
|
||
|
||
static void
|
||
hardwire_close (struct serial *scb)
|
||
{
|
||
if (scb->fd < 0)
|
||
return;
|
||
|
||
close (scb->fd);
|
||
scb->fd = -1;
|
||
}
|
||
|
||
|
||
|
||
/* The hardwire ops. */
|
||
|
||
static const struct serial_ops hardwire_ops =
|
||
{
|
||
"hardwire",
|
||
hardwire_open,
|
||
hardwire_close,
|
||
NULL,
|
||
ser_base_readchar,
|
||
ser_base_write,
|
||
hardwire_flush_output,
|
||
hardwire_flush_input,
|
||
hardwire_send_break,
|
||
hardwire_raw,
|
||
hardwire_get_tty_state,
|
||
hardwire_copy_tty_state,
|
||
hardwire_set_tty_state,
|
||
hardwire_print_tty_state,
|
||
hardwire_noflush_set_tty_state,
|
||
hardwire_setbaudrate,
|
||
hardwire_setstopbits,
|
||
hardwire_setparity,
|
||
hardwire_drain_output,
|
||
ser_base_async,
|
||
ser_unix_read_prim,
|
||
ser_unix_write_prim
|
||
};
|
||
|
||
void
|
||
_initialize_ser_hardwire (void)
|
||
{
|
||
serial_add_interface (&hardwire_ops);
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
#ifdef CRTSCTS
|
||
add_setshow_boolean_cmd ("remoteflow", no_class,
|
||
&serial_hwflow, _("\
|
||
Set use of hardware flow control for remote serial I/O."), _("\
|
||
Show use of hardware flow control for remote serial I/O."), _("\
|
||
Enable or disable hardware flow control (RTS/CTS) on the serial port\n\
|
||
when debugging using remote targets."),
|
||
NULL,
|
||
show_serial_hwflow,
|
||
&setlist, &showlist);
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
int
|
||
ser_unix_read_prim (struct serial *scb, size_t count)
|
||
{
|
||
return read (scb->fd, scb->buf, count);
|
||
}
|
||
|
||
int
|
||
ser_unix_write_prim (struct serial *scb, const void *buf, size_t len)
|
||
{
|
||
return write (scb->fd, buf, len);
|
||
}
|