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authorDaniel Jacobowitz <drow@false.org>2007-04-13 14:25:12 +0000
committerDaniel Jacobowitz <drow@false.org>2007-04-13 14:25:12 +0000
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tree0eb5fd361354202b4325897a78eec73a2c260155 /gdb/remote-utils.c
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-/* Generic support for remote debugging interfaces.
-
- Copyright (C) 1993, 1994, 1995, 1996, 1998, 2000, 2001, 2007
- 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
-
-/* This file actually contains two distinct logical "packages". They
- are packaged together in this one file because they are typically
- used together.
-
- The first package is an addition to the serial package. The
- addition provides reading and writing with debugging output and
- timeouts based on user settable variables. These routines are
- intended to support serial port based remote backends. These
- functions are prefixed with sr_.
-
- The second package is a collection of more or less generic
- functions for use by remote backends. They support user settable
- variables for debugging, retries, and the like.
-
- Todo:
-
- * a pass through mode a la kermit or telnet.
- * autobaud.
- * ask remote to change his baud rate.
- */
-
-#include <ctype.h>
-
-#include "defs.h"
-#include "gdb_string.h"
-#include "gdbcmd.h"
-#include "target.h"
-#include "serial.h"
-#include "gdbcore.h" /* for exec_bfd */
-#include "inferior.h" /* for generic_mourn_inferior */
-#include "remote-utils.h"
-#include "regcache.h"
-
-
-void _initialize_sr_support (void);
-
-struct _sr_settings sr_settings =
-{
- 4, /* timeout:
- remote-hms.c had 2
- remote-bug.c had "with a timeout of 2, we time out waiting for
- the prompt after an s-record dump."
-
- remote.c had (2): This was 5 seconds, which is a long time to
- sit and wait. Unless this is going though some terminal server
- or multiplexer or other form of hairy serial connection, I
- would think 2 seconds would be plenty.
- */
-
- 10, /* retries */
- NULL, /* device */
- NULL, /* descriptor */
-};
-
-struct gr_settings *gr_settings = NULL;
-
-static void usage (char *, char *);
-static void sr_com (char *, int);
-
-static void
-usage (char *proto, char *junk)
-{
- if (junk != NULL)
- fprintf_unfiltered (gdb_stderr, "Unrecognized arguments: `%s'.\n", junk);
-
- error (_("Usage: target %s [DEVICE [SPEED [DEBUG]]]\n\
-where DEVICE is the name of a device or HOST:PORT"), proto);
-
- return;
-}
-
-#define CHECKDONE(p, q) \
-{ \
- if (q == p) \
- { \
- if (*p == '\0') \
- return; \
- else \
- usage(proto, p); \
- } \
-}
-
-void
-sr_scan_args (char *proto, char *args)
-{
- int n;
- char *p, *q;
-
- /* if no args, then nothing to do. */
- if (args == NULL || *args == '\0')
- return;
-
- /* scan off white space. */
- for (p = args; isspace (*p); ++p);;
-
- /* find end of device name. */
- for (q = p; *q != '\0' && !isspace (*q); ++q);;
-
- /* check for missing or empty device name. */
- CHECKDONE (p, q);
- sr_set_device (savestring (p, q - p));
-
- /* look for baud rate. */
- n = strtol (q, &p, 10);
-
- /* check for missing or empty baud rate. */
- CHECKDONE (p, q);
- baud_rate = n;
-
- /* look for debug value. */
- n = strtol (p, &q, 10);
-
- /* check for missing or empty debug value. */
- CHECKDONE (p, q);
- sr_set_debug (n);
-
- /* scan off remaining white space. */
- for (p = q; isspace (*p); ++p);;
-
- /* if not end of string, then there's unrecognized junk. */
- if (*p != '\0')
- usage (proto, p);
-
- return;
-}
-
-void
-gr_generic_checkin (void)
-{
- sr_write_cr ("");
- gr_expect_prompt ();
-}
-
-void
-gr_open (char *args, int from_tty, struct gr_settings *gr)
-{
- target_preopen (from_tty);
- sr_scan_args (gr->ops->to_shortname, args);
- unpush_target (gr->ops);
-
- gr_settings = gr;
-
- if (sr_get_desc () != NULL)
- gr_close (0);
-
- /* If no args are specified, then we use the device specified by a
- previous command or "set remotedevice". But if there is no
- device, better stop now, not dump core. */
-
- if (sr_get_device () == NULL)
- usage (gr->ops->to_shortname, NULL);
-
- sr_set_desc (serial_open (sr_get_device ()));
- if (!sr_get_desc ())
- perror_with_name ((char *) sr_get_device ());
-
- if (baud_rate != -1)
- {
- if (serial_setbaudrate (sr_get_desc (), baud_rate) != 0)
- {
- serial_close (sr_get_desc ());
- perror_with_name (sr_get_device ());
- }
- }
-
- serial_raw (sr_get_desc ());
-
- /* If there is something sitting in the buffer we might take it as a
- response to a command, which would be bad. */
- serial_flush_input (sr_get_desc ());
-
- /* default retries */
- if (sr_get_retries () == 0)
- sr_set_retries (1);
-
- /* default clear breakpoint function */
- if (gr_settings->clear_all_breakpoints == NULL)
- gr_settings->clear_all_breakpoints = remove_breakpoints;
-
- if (from_tty)
- {
- printf_filtered ("Remote debugging using `%s'", sr_get_device ());
- if (baud_rate != -1)
- printf_filtered (" at baud rate of %d",
- baud_rate);
- printf_filtered ("\n");
- }
-
- push_target (gr->ops);
- gr_checkin ();
- gr_clear_all_breakpoints ();
- return;
-}
-
-/* Read a character from the remote system masking it down to 7 bits
- and doing all the fancy timeout stuff. */
-
-int
-sr_readchar (void)
-{
- int buf;
-
- buf = serial_readchar (sr_get_desc (), sr_get_timeout ());
-
- if (buf == SERIAL_TIMEOUT)
- error (_("Timeout reading from remote system."));
-
- if (sr_get_debug () > 0)
- printf_unfiltered ("%c", buf);
-
- return buf & 0x7f;
-}
-
-int
-sr_pollchar (void)
-{
- int buf;
-
- buf = serial_readchar (sr_get_desc (), 0);
- if (buf == SERIAL_TIMEOUT)
- buf = 0;
- if (sr_get_debug () > 0)
- {
- if (buf)
- printf_unfiltered ("%c", buf);
- else
- printf_unfiltered ("<empty character poll>");
- }
-
- return buf & 0x7f;
-}
-
-/* Keep discarding input from the remote system, until STRING is found.
- Let the user break out immediately. */
-void
-sr_expect (char *string)
-{
- char *p = string;
-
- immediate_quit++;
- while (1)
- {
- if (sr_readchar () == *p)
- {
- p++;
- if (*p == '\0')
- {
- immediate_quit--;
- return;
- }
- }
- else
- p = string;
- }
-}
-
-void
-sr_write (char *a, int l)
-{
- int i;
-
- if (serial_write (sr_get_desc (), a, l) != 0)
- perror_with_name (_("sr_write: Error writing to remote"));
-
- if (sr_get_debug () > 0)
- for (i = 0; i < l; i++)
- printf_unfiltered ("%c", a[i]);
-
- return;
-}
-
-void
-sr_write_cr (char *s)
-{
- sr_write (s, strlen (s));
- sr_write ("\r", 1);
- return;
-}
-
-int
-sr_timed_read (char *buf, int n)
-{
- int i;
- char c;
-
- i = 0;
- while (i < n)
- {
- c = sr_readchar ();
-
- if (c == 0)
- return i;
- buf[i] = c;
- i++;
-
- }
- return i;
-}
-
-/* Get a hex digit from the remote system & return its value. If
- ignore_space is nonzero, ignore spaces (not newline, tab, etc). */
-
-int
-sr_get_hex_digit (int ignore_space)
-{
- int ch;
-
- while (1)
- {
- ch = sr_readchar ();
- if (ch >= '0' && ch <= '9')
- return ch - '0';
- else if (ch >= 'A' && ch <= 'F')
- return ch - 'A' + 10;
- else if (ch >= 'a' && ch <= 'f')
- return ch - 'a' + 10;
- else if (ch != ' ' || !ignore_space)
- {
- gr_expect_prompt ();
- error (_("Invalid hex digit from remote system."));
- }
- }
-}
-
-/* Get a byte from the remote and put it in *BYT. Accept any number
- leading spaces. */
-void
-sr_get_hex_byte (char *byt)
-{
- int val;
-
- val = sr_get_hex_digit (1) << 4;
- val |= sr_get_hex_digit (0);
- *byt = val;
-}
-
-/* Read a 32-bit hex word from the remote, preceded by a space */
-long
-sr_get_hex_word (void)
-{
- long val;
- int j;
-
- val = 0;
- for (j = 0; j < 8; j++)
- val = (val << 4) + sr_get_hex_digit (j == 0);
- return val;
-}
-
-/* Put a command string, in args, out to the remote. The remote is assumed to
- be in raw mode, all writing/reading done through desc.
- Ouput from the remote is placed on the users terminal until the
- prompt from the remote is seen.
- FIXME: Can't handle commands that take input. */
-
-static void
-sr_com (char *args, int fromtty)
-{
- sr_check_open ();
-
- if (!args)
- return;
-
- /* Clear all input so only command relative output is displayed */
-
- sr_write_cr (args);
- sr_write ("\030", 1);
- registers_changed ();
- gr_expect_prompt ();
-}
-
-void
-gr_close (int quitting)
-{
- gr_clear_all_breakpoints ();
-
- if (sr_is_open ())
- {
- serial_close (sr_get_desc ());
- sr_set_desc (NULL);
- }
-
- return;
-}
-
-/* gr_detach()
- takes a program previously attached to and detaches it.
- We better not have left any breakpoints
- in the program or it'll die when it hits one.
- Close the open connection to the remote debugger.
- Use this when you want to detach and do something else
- with your gdb. */
-
-void
-gr_detach (char *args, int from_tty)
-{
- if (args)
- error (_("Argument given to \"detach\" when remotely debugging."));
-
- if (sr_is_open ())
- gr_clear_all_breakpoints ();
-
- pop_target ();
- if (from_tty)
- puts_filtered ("Ending remote debugging.\n");
-
- return;
-}
-
-void
-gr_files_info (struct target_ops *ops)
-{
-#ifdef __GO32__
- printf_filtered ("\tAttached to DOS asynctsr\n");
-#else
- printf_filtered ("\tAttached to %s", sr_get_device ());
- if (baud_rate != -1)
- printf_filtered ("at %d baud", baud_rate);
- printf_filtered ("\n");
-#endif
-
- if (exec_bfd)
- {
- printf_filtered ("\tand running program %s\n",
- bfd_get_filename (exec_bfd));
- }
- printf_filtered ("\tusing the %s protocol.\n", ops->to_shortname);
-}
-
-void
-gr_mourn (void)
-{
- gr_clear_all_breakpoints ();
- unpush_target (gr_get_ops ());
- generic_mourn_inferior ();
-}
-
-void
-gr_kill (void)
-{
- return;
-}
-
-/* This is called not only when we first attach, but also when the
- user types "run" after having attached. */
-void
-gr_create_inferior (char *execfile, char *args, char **env)
-{
- int entry_pt;
-
- if (args && *args)
- error (_("Can't pass arguments to remote process."));
-
- if (execfile == 0 || exec_bfd == 0)
- error (_("No executable file specified"));
-
- entry_pt = (int) bfd_get_start_address (exec_bfd);
- sr_check_open ();
-
- gr_kill ();
- gr_clear_all_breakpoints ();
-
- init_wait_for_inferior ();
- gr_checkin ();
-
- insert_breakpoints (); /* Needed to get correct instruction in cache */
- proceed (entry_pt, -1, 0);
-}
-
-/* Given a null terminated list of strings LIST, read the input until we find one of
- them. Return the index of the string found or -1 on error. '?' means match
- any single character. Note that with the algorithm we use, the initial
- character of the string cannot recur in the string, or we will not find some
- cases of the string in the input. If PASSTHROUGH is non-zero, then
- pass non-matching data on. */
-
-int
-gr_multi_scan (char *list[], int passthrough)
-{
- char *swallowed = NULL; /* holding area */
- char *swallowed_p = swallowed; /* Current position in swallowed. */
- int ch;
- int ch_handled;
- int i;
- int string_count;
- int max_length;
- char **plist;
-
- /* Look through the strings. Count them. Find the largest one so we can
- allocate a holding area. */
-
- for (max_length = string_count = i = 0;
- list[i] != NULL;
- ++i, ++string_count)
- {
- int length = strlen (list[i]);
-
- if (length > max_length)
- max_length = length;
- }
-
- /* if we have no strings, then something is wrong. */
- if (string_count == 0)
- return (-1);
-
- /* otherwise, we will need a holding area big enough to hold almost two
- copies of our largest string. */
- swallowed_p = swallowed = alloca (max_length << 1);
-
- /* and a list of pointers to current scan points. */
- plist = (char **) alloca (string_count * sizeof (*plist));
-
- /* and initialize */
- for (i = 0; i < string_count; ++i)
- plist[i] = list[i];
-
- for (ch = sr_readchar (); /* loop forever */ ; ch = sr_readchar ())
- {
- QUIT; /* Let user quit and leave process running */
- ch_handled = 0;
-
- for (i = 0; i < string_count; ++i)
- {
- if (ch == *plist[i] || *plist[i] == '?')
- {
- ++plist[i];
- if (*plist[i] == '\0')
- return (i);
-
- if (!ch_handled)
- *swallowed_p++ = ch;
-
- ch_handled = 1;
- }
- else
- plist[i] = list[i];
- }
-
- if (!ch_handled)
- {
- char *p;
-
- /* Print out any characters which have been swallowed. */
- if (passthrough)
- {
- for (p = swallowed; p < swallowed_p; ++p)
- fputc_unfiltered (*p, gdb_stdout);
-
- fputc_unfiltered (ch, gdb_stdout);
- }
-
- swallowed_p = swallowed;
- }
- }
-#if 0
- /* Never reached. */
- return (-1);
-#endif
-}
-
-/* Get ready to modify the registers array. On machines which store
- individual registers, this doesn't need to do anything. On machines
- which store all the registers in one fell swoop, this makes sure
- that registers contains all the registers from the program being
- debugged. */
-
-void
-gr_prepare_to_store (void)
-{
- /* Do nothing, since we assume we can store individual regs */
-}
-
-void
-_initialize_sr_support (void)
-{
- /* FIXME-now: if target is open... */
- add_setshow_filename_cmd ("remotedevice", no_class, &sr_settings.device, _("\
-Set device for remote serial I/O."), _("\
-Show device for remote serial I/O."), _("\
-This device is used as the serial port when debugging using remote targets."),
- NULL,
- NULL, /* FIXME: i18n: */
- &setlist, &showlist);
-
- add_com ("remote", class_obscure, sr_com,
- _("Send a command to the remote monitor."));
-
-}