old-cross-binutils/gdb/serial.c
Fred Fish e8f1ad9a8b * NEWS: Make note of new record and replay feature for
remote debug sessions.
	* serial.c (gdbcmd.h): Include.
	(serial_logfile, serial_logfp, serial_reading, serial_writing):
 	Define here, for remote debug session logging.
	(serial_log_command, serial_logchar, serial_write, serial_readchar):
	New functions for remote debug session logging.
	(serial_open): Open remote debug session log file when needed.
	(serial_close): Close remote debug session log file when needed.
	(_initialize_serial): Add set/show commands for name of remote
	debug session log file.
	* serial.h (serial_readchar): Declare
	(SERIAL_READCHAR): Call serial_readchar().
	(SERIAL_WRITE): Call serial_write().
	(serial_close): Declare as extern.
	(serial_logfile, serial_logfp): Declare.
	* top.c (execute_command): Declare serial_logfp.  Log user command
	in remote debug session log if log file is open.
	* remote-array.c (array_wait): #ifdef out echo to gdb_stdout.
	(array_read_inferior_memory): Rewrite to fix memory overwrite bug.
	* remote-array.c (SREC_SIZE): Remove, duplicates define in
	monitor.h.
	* remote-array.c (hexchars, hex2mem):  Remove, unused.
	* gdbserver/low-linux.c (store_inferior_registers): Remove
	unnecessary extern declaration of registers[].
	* gdbserver/Makefile.in (all): Add gdbreplay.
	* gdbserver/gdbreplay.c: New file.
	* gdbserver/README: Give example of recording a remote
	debug session with gdb and then replaying it with gdbreplay.
1996-01-24 21:30:37 +00:00

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/* Generic serial interface routines
Copyright 1992, 1993, 1996 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 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "serial.h"
#include "gdb_string.h"
#include "gdbcmd.h"
/* Linked list of serial I/O handlers */
static struct serial_ops *serial_ops_list = NULL;
/* This is the last serial stream opened. Used by connect command. */
static serial_t last_serial_opened = NULL;
/* Pointer to list of scb's. */
static serial_t scb_base;
/* Non-NULL gives filename which contains a recording of the remote session,
suitable for playback by gdbserver. */
char *serial_logfile = NULL;
FILE *serial_logfp = NULL;
static int serial_reading = 0;
static int serial_writing = 0;
void
serial_log_command (cmd)
const char *cmd;
{
if (serial_reading || serial_writing)
{
fputc ('\n', serial_logfp);
serial_reading = 0;
serial_writing = 0;
}
fprintf (serial_logfp, "c %s\n", cmd);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
fflush (serial_logfp);
}
static void
serial_logchar (ch)
int ch;
{
switch (ch)
{
case '\\': fputs ("\\\\", serial_logfp); break;
case '\b': fputs ("\\b", serial_logfp); break;
case '\f': fputs ("\\f", serial_logfp); break;
case '\n': fputs ("\\n", serial_logfp); break;
case '\r': fputs ("\\r", serial_logfp); break;
case '\t': fputs ("\\t", serial_logfp); break;
case '\v': fputs ("\\v", serial_logfp); break;
default: fprintf (serial_logfp, isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF); break;
}
}
int
serial_write (scb, str, len)
serial_t scb;
const char *str;
int len;
{
int count;
if (serial_logfp != NULL)
{
if (serial_reading)
{
fputc ('\n', serial_logfp);
serial_reading = 0;
}
if (!serial_writing)
{
serial_logchar ('w');
serial_logchar (' ');
serial_writing = 1;
}
for (count = 0; count < len; count++)
{
serial_logchar (str[count]);
}
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
fflush (serial_logfp);
}
return (scb -> ops -> write (scb, str, len));
}
int
serial_readchar (scb, timeout)
serial_t scb;
int timeout;
{
int ch;
ch = scb -> ops -> readchar (scb, timeout);
if (serial_logfp != NULL)
{
if (serial_writing)
{
fputc ('\n', serial_logfp);
serial_writing = 0;
}
if (!serial_reading)
{
serial_logchar ('r');
serial_logchar (' ');
serial_reading = 1;
}
serial_logchar (ch);
/* Make sure that the log file is as up-to-date as possible,
in case we are getting ready to dump core or something. */
fflush (serial_logfp);
}
return (ch);
}
static struct serial_ops *
serial_interface_lookup (name)
char *name;
{
struct serial_ops *ops;
for (ops = serial_ops_list; ops; ops = ops->next)
if (strcmp (name, ops->name) == 0)
return ops;
return NULL;
}
void
serial_add_interface(optable)
struct serial_ops *optable;
{
optable->next = serial_ops_list;
serial_ops_list = optable;
}
/* Open up a device or a network socket, depending upon the syntax of NAME. */
serial_t
serial_open (name)
const char *name;
{
serial_t scb;
struct serial_ops *ops;
for (scb = scb_base; scb; scb = scb->next)
if (scb->name && strcmp (scb->name, name) == 0)
{
scb->refcnt++;
return scb;
}
if (strcmp (name, "pc") == 0)
ops = serial_interface_lookup ("pc");
else if (strchr (name, ':'))
ops = serial_interface_lookup ("tcp");
else if (strncmp (name, "lpt", 3) == 0)
ops = serial_interface_lookup ("parallel");
else
ops = serial_interface_lookup ("hardwire");
if (!ops)
return NULL;
scb = (serial_t)xmalloc (sizeof (struct _serial_t));
scb->ops = ops;
scb->bufcnt = 0;
scb->bufp = scb->buf;
if (scb->ops->open(scb, name))
{
free (scb);
return NULL;
}
scb->name = strsave (name);
scb->next = scb_base;
scb->refcnt = 1;
scb_base = scb;
last_serial_opened = scb;
if (serial_logfile != NULL)
{
serial_logfp = fopen (serial_logfile, "w");
if (serial_logfp == NULL)
{
perror_with_name (serial_logfile);
}
}
return scb;
}
serial_t
serial_fdopen (fd)
const int fd;
{
serial_t scb;
struct serial_ops *ops;
for (scb = scb_base; scb; scb = scb->next)
if (scb->fd == fd)
{
scb->refcnt++;
return scb;
}
ops = serial_interface_lookup ("hardwire");
if (!ops)
return NULL;
scb = (serial_t)xmalloc (sizeof (struct _serial_t));
scb->ops = ops;
scb->bufcnt = 0;
scb->bufp = scb->buf;
scb->fd = fd;
scb->name = NULL;
scb->next = scb_base;
scb->refcnt = 1;
scb_base = scb;
last_serial_opened = scb;
return scb;
}
void
serial_close(scb, really_close)
serial_t scb;
int really_close;
{
serial_t tmp_scb;
last_serial_opened = NULL;
if (serial_logfp)
{
if (serial_reading || serial_writing)
{
fputc ('\n', serial_logfp);
serial_reading = 0;
serial_writing = 0;
}
fclose (serial_logfp);
serial_logfp = NULL;
}
/* This is bogus. It's not our fault if you pass us a bad scb...! Rob, you
should fix your code instead. */
if (!scb)
return;
scb->refcnt--;
if (scb->refcnt > 0)
return;
if (really_close)
scb->ops->close (scb);
if (scb->name)
free (scb->name);
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;
}
free(scb);
}
#if 0
/*
The connect command is #if 0 because I hadn't thought of an elegant
way to wait for I/O on two serial_t's simultaneously. Two solutions
came to mind:
1) Fork, and have have one fork handle the to user direction,
and have the other hand the to target direction. This
obviously won't cut it for MSDOS.
2) Use something like select. This assumes that stdin and
the target side can both be waited on via the same
mechanism. This may not be true for DOS, if GDB is
talking to the target via a TCP socket.
-grossman, 8 Jun 93
*/
/* Connect the user directly to the remote system. This command acts just like
the 'cu' or 'tip' command. Use <CR>~. or <CR>~^D to break out. */
static serial_t tty_desc; /* Controlling terminal */
static void
cleanup_tty(ttystate)
serial_ttystate ttystate;
{
printf_unfiltered ("\r\n[Exiting connect mode]\r\n");
SERIAL_SET_TTY_STATE (tty_desc, ttystate);
free (ttystate);
SERIAL_CLOSE (tty_desc);
}
static void
connect_command (args, fromtty)
char *args;
int fromtty;
{
int c;
char cur_esc = 0;
serial_ttystate ttystate;
serial_t port_desc; /* TTY port */
dont_repeat();
if (args)
fprintf_unfiltered(gdb_stderr, "This command takes no args. They have been ignored.\n");
printf_unfiltered("[Entering connect mode. Use ~. or ~^D to escape]\n");
tty_desc = SERIAL_FDOPEN (0);
port_desc = last_serial_opened;
ttystate = SERIAL_GET_TTY_STATE (tty_desc);
SERIAL_RAW (tty_desc);
SERIAL_RAW (port_desc);
make_cleanup (cleanup_tty, ttystate);
while (1)
{
int mask;
mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1);
if (mask & 2)
{ /* tty input */
char cx;
while (1)
{
c = SERIAL_READCHAR(tty_desc, 0);
if (c == SERIAL_TIMEOUT)
break;
if (c < 0)
perror_with_name("connect");
cx = c;
SERIAL_WRITE(port_desc, &cx, 1);
switch (cur_esc)
{
case 0:
if (c == '\r')
cur_esc = c;
break;
case '\r':
if (c == '~')
cur_esc = c;
else
cur_esc = 0;
break;
case '~':
if (c == '.' || c == '\004')
return;
else
cur_esc = 0;
}
}
}
if (mask & 1)
{ /* Port input */
char cx;
while (1)
{
c = SERIAL_READCHAR(port_desc, 0);
if (c == SERIAL_TIMEOUT)
break;
if (c < 0)
perror_with_name("connect");
cx = c;
SERIAL_WRITE(tty_desc, &cx, 1);
}
}
}
}
#endif /* 0 */
/* VARARGS */
void
#ifdef ANSI_PROTOTYPES
serial_printf (serial_t desc, const char *format, ...)
#else
serial_printf (va_alist)
va_dcl
#endif
{
va_list args;
char *buf;
#ifdef ANSI_PROTOTYPES
va_start (args, format);
#else
serial_t desc;
char *format;
va_start (args);
desc = va_arg (args, serial_t);
format = va_arg (args, char *);
#endif
vasprintf (&buf, format, args);
SERIAL_WRITE (desc, buf, strlen (buf));
free (buf);
va_end (args);
}
void
_initialize_serial ()
{
#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_show_from_set (add_set_cmd ("remotelogfile", no_class,
var_filename, (char *)&serial_logfile,
"Set filename for remote session recording.\n\
This file is used to record the remote session for future playback\n\
by gdbserver.", &setlist),
&showlist);
}