1144 lines
26 KiB
C
1144 lines
26 KiB
C
/* Remote target communications for serial-line targets using SDS' protocol.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002 Free Software
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This interface was written by studying the behavior of the SDS
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monitor on an ADS 821/860 board, and by consulting the
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documentation of the monitor that is available on Motorola's web
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site. -sts 8/13/97 */
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#include "defs.h"
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#include "gdb_string.h"
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#include <fcntl.h>
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#include "frame.h"
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#include "inferior.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "target.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "gdb-stabs.h"
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#include "gdbthread.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <signal.h>
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#include "serial.h"
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extern void _initialize_remote_sds (void);
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/* Declarations of local functions. */
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static int sds_write_bytes (CORE_ADDR, char *, int);
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static int sds_read_bytes (CORE_ADDR, char *, int);
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static void sds_files_info (struct target_ops *ignore);
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static int sds_xfer_memory (CORE_ADDR, char *, int, int,
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struct mem_attrib *, struct target_ops *);
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static void sds_prepare_to_store (void);
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static void sds_fetch_registers (int);
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static void sds_resume (ptid_t, int, enum target_signal);
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static int sds_start_remote (void *);
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static void sds_open (char *, int);
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static void sds_close (int);
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static void sds_store_registers (int);
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static void sds_mourn (void);
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static void sds_create_inferior (char *, char *, char **);
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static void sds_load (char *, int);
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static int getmessage (unsigned char *, int);
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static int putmessage (unsigned char *, int);
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static int sds_send (unsigned char *, int);
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static int readchar (int);
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static ptid_t sds_wait (ptid_t, struct target_waitstatus *);
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static void sds_kill (void);
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static int tohex (int);
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static int fromhex (int);
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static void sds_detach (char *, int);
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static void sds_interrupt (int);
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static void sds_interrupt_twice (int);
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static void interrupt_query (void);
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static int read_frame (char *);
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static int sds_insert_breakpoint (CORE_ADDR, char *);
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static int sds_remove_breakpoint (CORE_ADDR, char *);
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static void init_sds_ops (void);
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static void sds_command (char *args, int from_tty);
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/* Define the target operations vector. */
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static struct target_ops sds_ops;
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/* This was 5 seconds, which is a long time to sit and wait.
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Unless this is going though some terminal server or multiplexer or
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other form of hairy serial connection, I would think 2 seconds would
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be plenty. */
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static int sds_timeout = 2;
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/* Descriptor for I/O to remote machine. Initialize it to NULL so
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that sds_open knows that we don't have a file open when the program
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starts. */
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static struct serial *sds_desc = NULL;
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/* This limit comes from the monitor. */
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#define PBUFSIZ 250
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/* Maximum number of bytes to read/write at once. The value here
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is chosen to fill up a packet (the headers account for the 32). */
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#define MAXBUFBYTES ((PBUFSIZ-32)/2)
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static int next_msg_id;
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static int just_started;
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static int message_pending;
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/* Clean up connection to a remote debugger. */
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static void
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sds_close (int quitting)
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{
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if (sds_desc)
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serial_close (sds_desc);
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sds_desc = NULL;
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}
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/* Stub for catch_errors. */
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static int
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sds_start_remote (void *dummy)
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{
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int c;
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unsigned char buf[200];
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immediate_quit++; /* Allow user to interrupt it */
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/* Ack any packet which the remote side has already sent. */
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serial_write (sds_desc, "{#*\r\n", 5);
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serial_write (sds_desc, "{#}\r\n", 5);
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while ((c = readchar (1)) >= 0)
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printf_unfiltered ("%c", c);
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printf_unfiltered ("\n");
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next_msg_id = 251;
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buf[0] = 26;
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sds_send (buf, 1);
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buf[0] = 0;
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sds_send (buf, 1);
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immediate_quit--;
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start_remote (); /* Initialize gdb process mechanisms */
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return 1;
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}
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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static void
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sds_open (char *name, int from_tty)
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{
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if (name == 0)
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error ("To open a remote debug connection, you need to specify what serial\n\
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device is attached to the remote system (e.g. /dev/ttya).");
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target_preopen (from_tty);
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unpush_target (&sds_ops);
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sds_desc = serial_open (name);
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if (!sds_desc)
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perror_with_name (name);
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if (baud_rate != -1)
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{
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if (serial_setbaudrate (sds_desc, baud_rate))
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{
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serial_close (sds_desc);
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perror_with_name (name);
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}
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}
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serial_raw (sds_desc);
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/* If there is something sitting in the buffer we might take it as a
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response to a command, which would be bad. */
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serial_flush_input (sds_desc);
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if (from_tty)
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{
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puts_filtered ("Remote debugging using ");
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puts_filtered (name);
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puts_filtered ("\n");
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}
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push_target (&sds_ops); /* Switch to using remote target now */
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just_started = 1;
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/* Start the remote connection; if error (0), discard this target.
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In particular, if the user quits, be sure to discard it (we'd be
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in an inconsistent state otherwise). */
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if (!catch_errors (sds_start_remote, NULL,
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"Couldn't establish connection to remote target\n",
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RETURN_MASK_ALL))
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pop_target ();
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}
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/* This takes a program previously attached to and detaches it. After
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this is done, GDB can be used to debug some other program. We
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better not have left any breakpoints in the target program or it'll
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die when it hits one. */
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static void
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sds_detach (char *args, int from_tty)
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{
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char buf[PBUFSIZ];
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if (args)
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error ("Argument given to \"detach\" when remotely debugging.");
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#if 0
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/* Tell the remote target to detach. */
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strcpy (buf, "D");
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sds_send (buf, 1);
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#endif
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pop_target ();
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if (from_tty)
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puts_filtered ("Ending remote debugging.\n");
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}
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/* Convert hex digit A to a number. */
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static int
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fromhex (int a)
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{
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if (a >= '0' && a <= '9')
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return a - '0';
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else if (a >= 'a' && a <= 'f')
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return a - 'a' + 10;
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else
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error ("Reply contains invalid hex digit %d", a);
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}
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/* Convert number NIB to a hex digit. */
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static int
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tohex (int nib)
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{
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if (nib < 10)
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return '0' + nib;
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else
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return 'a' + nib - 10;
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}
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static int
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tob64 (unsigned char *inbuf, char *outbuf, int len)
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{
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int i, sum;
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char *p;
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if (len % 3 != 0)
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error ("bad length");
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p = outbuf;
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for (i = 0; i < len; i += 3)
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{
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/* Collect the next three bytes into a number. */
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sum = ((long) *inbuf++) << 16;
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sum |= ((long) *inbuf++) << 8;
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sum |= ((long) *inbuf++);
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/* Spit out 4 6-bit encodings. */
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*p++ = ((sum >> 18) & 0x3f) + '0';
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*p++ = ((sum >> 12) & 0x3f) + '0';
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*p++ = ((sum >> 6) & 0x3f) + '0';
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*p++ = (sum & 0x3f) + '0';
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}
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return (p - outbuf);
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}
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static int
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fromb64 (char *inbuf, char *outbuf, int len)
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{
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int i, sum;
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if (len % 4 != 0)
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error ("bad length");
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for (i = 0; i < len; i += 4)
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{
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/* Collect 4 6-bit digits. */
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sum = (*inbuf++ - '0') << 18;
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sum |= (*inbuf++ - '0') << 12;
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sum |= (*inbuf++ - '0') << 6;
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sum |= (*inbuf++ - '0');
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/* Now take the resulting 24-bit number and get three bytes out
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of it. */
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*outbuf++ = (sum >> 16) & 0xff;
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*outbuf++ = (sum >> 8) & 0xff;
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*outbuf++ = sum & 0xff;
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}
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return (len / 4) * 3;
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}
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/* Tell the remote machine to resume. */
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static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
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int last_sent_step;
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static void
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sds_resume (ptid_t ptid, int step, enum target_signal siggnal)
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{
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unsigned char buf[PBUFSIZ];
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last_sent_signal = siggnal;
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last_sent_step = step;
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buf[0] = (step ? 21 : 20);
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buf[1] = 0; /* (should be signal?) */
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sds_send (buf, 2);
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}
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/* Send a message to target to halt it. Target will respond, and send
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us a message pending notice. */
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static void
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sds_interrupt (int signo)
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{
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unsigned char buf[PBUFSIZ];
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/* If this doesn't work, try more severe steps. */
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signal (signo, sds_interrupt_twice);
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if (remote_debug)
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fprintf_unfiltered (gdb_stdlog, "sds_interrupt called\n");
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buf[0] = 25;
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sds_send (buf, 1);
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}
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static void (*ofunc) ();
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/* The user typed ^C twice. */
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static void
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sds_interrupt_twice (int signo)
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{
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signal (signo, ofunc);
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interrupt_query ();
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signal (signo, sds_interrupt);
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}
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/* Ask the user what to do when an interrupt is received. */
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static void
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interrupt_query (void)
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{
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target_terminal_ours ();
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if (query ("Interrupted while waiting for the program.\n\
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Give up (and stop debugging it)? "))
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{
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target_mourn_inferior ();
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throw_exception (RETURN_QUIT);
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||
}
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||
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target_terminal_inferior ();
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||
}
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/* If nonzero, ignore the next kill. */
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int kill_kludge;
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||
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/* Wait until the remote machine stops, then return, storing status in
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STATUS just as `wait' would. Returns "pid" (though it's not clear
|
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what, if anything, that means in the case of this target). */
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static ptid_t
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sds_wait (ptid_t ptid, struct target_waitstatus *status)
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{
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unsigned char buf[PBUFSIZ];
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int retlen;
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status->kind = TARGET_WAITKIND_EXITED;
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status->value.integer = 0;
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ofunc = (void (*)()) signal (SIGINT, sds_interrupt);
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signal (SIGINT, ofunc);
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||
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||
if (just_started)
|
||
{
|
||
just_started = 0;
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||
status->kind = TARGET_WAITKIND_STOPPED;
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||
return inferior_ptid;
|
||
}
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||
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while (1)
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{
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getmessage (buf, 1);
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if (message_pending)
|
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{
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buf[0] = 26;
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retlen = sds_send (buf, 1);
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if (remote_debug)
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{
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fprintf_unfiltered (gdb_stdlog, "Signals: %02x%02x %02x %02x\n",
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buf[0], buf[1],
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buf[2], buf[3]);
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||
}
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message_pending = 0;
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||
status->kind = TARGET_WAITKIND_STOPPED;
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status->value.sig = TARGET_SIGNAL_TRAP;
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goto got_status;
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}
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}
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got_status:
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return inferior_ptid;
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}
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static unsigned char sprs[16];
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/* Read the remote registers into the block REGS. */
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/* Currently we just read all the registers, so we don't use regno. */
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||
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static void
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||
sds_fetch_registers (int regno)
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
int i, retlen;
|
||
char *regs = alloca (DEPRECATED_REGISTER_BYTES);
|
||
|
||
/* Unimplemented registers read as all bits zero. */
|
||
memset (regs, 0, DEPRECATED_REGISTER_BYTES);
|
||
|
||
buf[0] = 18;
|
||
buf[1] = 1;
|
||
buf[2] = 0;
|
||
retlen = sds_send (buf, 3);
|
||
|
||
for (i = 0; i < 4 * 6; ++i)
|
||
regs[i + 4 * 32 + 8 * 32] = buf[i];
|
||
for (i = 0; i < 4 * 4; ++i)
|
||
sprs[i] = buf[i + 4 * 7];
|
||
|
||
buf[0] = 18;
|
||
buf[1] = 2;
|
||
buf[2] = 0;
|
||
retlen = sds_send (buf, 3);
|
||
|
||
for (i = 0; i < retlen; i++)
|
||
regs[i] = buf[i];
|
||
|
||
/* (should warn about reply too short) */
|
||
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
supply_register (i, ®s[DEPRECATED_REGISTER_BYTE (i)]);
|
||
}
|
||
|
||
/* Prepare to store registers. Since we may send them all, we have to
|
||
read out the ones we don't want to change first. */
|
||
|
||
static void
|
||
sds_prepare_to_store (void)
|
||
{
|
||
/* Make sure the entire registers array is valid. */
|
||
deprecated_read_register_bytes (0, (char *) NULL, DEPRECATED_REGISTER_BYTES);
|
||
}
|
||
|
||
/* Store register REGNO, or all registers if REGNO == -1, from the contents
|
||
of REGISTERS. FIXME: ignores errors. */
|
||
|
||
static void
|
||
sds_store_registers (int regno)
|
||
{
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
int i;
|
||
|
||
/* Store all the special-purpose registers. */
|
||
p = buf;
|
||
*p++ = 19;
|
||
*p++ = 1;
|
||
*p++ = 0;
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 6; i++)
|
||
*p++ = deprecated_registers[i + 4 * 32 + 8 * 32];
|
||
for (i = 0; i < 4 * 1; i++)
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 4; i++)
|
||
*p++ = sprs[i];
|
||
|
||
sds_send (buf, p - buf);
|
||
|
||
/* Store all the general-purpose registers. */
|
||
p = buf;
|
||
*p++ = 19;
|
||
*p++ = 2;
|
||
*p++ = 0;
|
||
*p++ = 0;
|
||
for (i = 0; i < 4 * 32; i++)
|
||
*p++ = deprecated_registers[i];
|
||
|
||
sds_send (buf, p - buf);
|
||
|
||
}
|
||
|
||
/* Write memory data directly to the remote machine. This does not
|
||
inform the data cache; the data cache uses this. MEMADDR is the
|
||
address in the remote memory space. MYADDR is the address of the
|
||
buffer in our space. LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
sds_write_bytes (CORE_ADDR memaddr, char *myaddr, int len)
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen;
|
||
unsigned char buf[PBUFSIZ];
|
||
int todo;
|
||
int i;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = 150;
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
todo = min (len, max_buf_size);
|
||
|
||
buf[0] = 13;
|
||
buf[1] = 0;
|
||
buf[2] = (int) (memaddr >> 24) & 0xff;
|
||
buf[3] = (int) (memaddr >> 16) & 0xff;
|
||
buf[4] = (int) (memaddr >> 8) & 0xff;
|
||
buf[5] = (int) (memaddr) & 0xff;
|
||
buf[6] = 1;
|
||
buf[7] = 0;
|
||
|
||
for (i = 0; i < todo; i++)
|
||
buf[i + 8] = myaddr[i];
|
||
|
||
sds_send (buf, 8 + todo);
|
||
|
||
/* (should look at result) */
|
||
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
return origlen;
|
||
}
|
||
|
||
/* Read memory data directly from the remote machine. This does not
|
||
use the data cache; the data cache uses this. MEMADDR is the
|
||
address in the remote memory space. MYADDR is the address of the
|
||
buffer in our space. LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
sds_read_bytes (CORE_ADDR memaddr, char *myaddr, int len)
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen, retlen;
|
||
unsigned char buf[PBUFSIZ];
|
||
int todo;
|
||
int i;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = 150;
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
todo = min (len, max_buf_size);
|
||
|
||
buf[0] = 12;
|
||
buf[1] = 0;
|
||
buf[2] = (int) (memaddr >> 24) & 0xff;
|
||
buf[3] = (int) (memaddr >> 16) & 0xff;
|
||
buf[4] = (int) (memaddr >> 8) & 0xff;
|
||
buf[5] = (int) (memaddr) & 0xff;
|
||
buf[6] = (int) (todo >> 8) & 0xff;
|
||
buf[7] = (int) (todo) & 0xff;
|
||
buf[8] = 1;
|
||
|
||
retlen = sds_send (buf, 9);
|
||
|
||
if (retlen - 2 != todo)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Reply describes memory byte by byte. */
|
||
|
||
for (i = 0; i < todo; i++)
|
||
myaddr[i] = buf[i + 2];
|
||
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
|
||
return origlen;
|
||
}
|
||
|
||
/* Read or write LEN bytes from inferior memory at MEMADDR,
|
||
transferring to or from debugger address MYADDR. Write to inferior
|
||
if SHOULD_WRITE is nonzero. Returns length of data written or
|
||
read; 0 for error. TARGET is unused. */
|
||
|
||
static int
|
||
sds_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int should_write,
|
||
struct mem_attrib *attrib, struct target_ops *target)
|
||
{
|
||
int res;
|
||
|
||
if (should_write)
|
||
res = sds_write_bytes (memaddr, myaddr, len);
|
||
else
|
||
res = sds_read_bytes (memaddr, myaddr, len);
|
||
|
||
return res;
|
||
}
|
||
|
||
|
||
static void
|
||
sds_files_info (struct target_ops *ignore)
|
||
{
|
||
puts_filtered ("Debugging over a serial connection, using SDS protocol.\n");
|
||
}
|
||
|
||
/* Stuff for dealing with the packets which are part of this protocol.
|
||
See comment at top of file for details. */
|
||
|
||
/* Read a single character from the remote end, masking it down to 7 bits. */
|
||
|
||
static int
|
||
readchar (int timeout)
|
||
{
|
||
int ch;
|
||
|
||
ch = serial_readchar (sds_desc, timeout);
|
||
|
||
if (remote_debug > 1 && ch >= 0)
|
||
fprintf_unfiltered (gdb_stdlog, "%c(%x)", ch, ch);
|
||
|
||
switch (ch)
|
||
{
|
||
case SERIAL_EOF:
|
||
error ("Remote connection closed");
|
||
case SERIAL_ERROR:
|
||
perror_with_name ("Remote communication error");
|
||
case SERIAL_TIMEOUT:
|
||
return ch;
|
||
default:
|
||
return ch & 0x7f;
|
||
}
|
||
}
|
||
|
||
/* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably
|
||
because 253, 254, and 255 are special flags in the protocol.) */
|
||
|
||
static int
|
||
compute_checksum (int csum, char *buf, int len)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < len; ++i)
|
||
csum += (unsigned char) buf[i];
|
||
|
||
csum %= 253;
|
||
return csum;
|
||
}
|
||
|
||
/* Send the command in BUF to the remote machine, and read the reply
|
||
into BUF also. */
|
||
|
||
static int
|
||
sds_send (unsigned char *buf, int len)
|
||
{
|
||
putmessage (buf, len);
|
||
|
||
return getmessage (buf, 0);
|
||
}
|
||
|
||
/* Send a message to the remote machine. */
|
||
|
||
static int
|
||
putmessage (unsigned char *buf, int len)
|
||
{
|
||
int i, enclen;
|
||
unsigned char csum = 0;
|
||
char buf2[PBUFSIZ], buf3[PBUFSIZ];
|
||
unsigned char header[3];
|
||
char *p;
|
||
|
||
/* Copy the packet into buffer BUF2, encapsulating it
|
||
and giving it a checksum. */
|
||
|
||
if (len > 170) /* Prosanity check */
|
||
internal_error (__FILE__, __LINE__, "failed internal consistency check");
|
||
|
||
if (remote_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stdlog, "Message to send: \"");
|
||
for (i = 0; i < len; ++i)
|
||
fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
|
||
fprintf_unfiltered (gdb_stdlog, "\"\n");
|
||
}
|
||
|
||
p = buf2;
|
||
*p++ = '$';
|
||
|
||
if (len % 3 != 0)
|
||
{
|
||
buf[len] = '\0';
|
||
buf[len + 1] = '\0';
|
||
}
|
||
|
||
header[1] = next_msg_id;
|
||
|
||
header[2] = len;
|
||
|
||
csum = compute_checksum (csum, buf, len);
|
||
csum = compute_checksum (csum, header + 1, 2);
|
||
|
||
header[0] = csum;
|
||
|
||
tob64 (header, p, 3);
|
||
p += 4;
|
||
enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3);
|
||
|
||
for (i = 0; i < enclen; ++i)
|
||
*p++ = buf3[i];
|
||
*p++ = '\r';
|
||
*p++ = '\n';
|
||
|
||
next_msg_id = (next_msg_id + 3) % 245;
|
||
|
||
/* Send it over and over until we get a positive ack. */
|
||
|
||
while (1)
|
||
{
|
||
if (remote_debug)
|
||
{
|
||
*p = '\0';
|
||
fprintf_unfiltered (gdb_stdlog, "Sending encoded: \"%s\"", buf2);
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
" (Checksum %d, id %d, length %d)\n",
|
||
header[0], header[1], header[2]);
|
||
gdb_flush (gdb_stdlog);
|
||
}
|
||
if (serial_write (sds_desc, buf2, p - buf2))
|
||
perror_with_name ("putmessage: write failed");
|
||
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
/* Come here after finding the start of the frame. Collect the rest
|
||
into BUF. Returns 0 on any error, 1 on success. */
|
||
|
||
static int
|
||
read_frame (char *buf)
|
||
{
|
||
char *bp;
|
||
int c;
|
||
|
||
bp = buf;
|
||
|
||
while (1)
|
||
{
|
||
c = readchar (sds_timeout);
|
||
|
||
switch (c)
|
||
{
|
||
case SERIAL_TIMEOUT:
|
||
if (remote_debug)
|
||
fputs_filtered ("Timeout in mid-message, retrying\n", gdb_stdlog);
|
||
return 0;
|
||
case '$':
|
||
if (remote_debug)
|
||
fputs_filtered ("Saw new packet start in middle of old one\n",
|
||
gdb_stdlog);
|
||
return 0; /* Start a new packet, count retries */
|
||
case '\r':
|
||
break;
|
||
|
||
case '\n':
|
||
{
|
||
*bp = '\000';
|
||
if (remote_debug)
|
||
fprintf_unfiltered (gdb_stdlog, "Received encoded: \"%s\"\n",
|
||
buf);
|
||
return 1;
|
||
}
|
||
|
||
default:
|
||
if (bp < buf + PBUFSIZ - 1)
|
||
{
|
||
*bp++ = c;
|
||
continue;
|
||
}
|
||
|
||
*bp = '\0';
|
||
puts_filtered ("Message too long: ");
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Read a packet from the remote machine, with error checking,
|
||
and store it in BUF. BUF is expected to be of size PBUFSIZ.
|
||
If FOREVER, wait forever rather than timing out; this is used
|
||
while the target is executing user code. */
|
||
|
||
static int
|
||
getmessage (unsigned char *buf, int forever)
|
||
{
|
||
int c, c2, c3;
|
||
int tries;
|
||
int timeout;
|
||
int val, i, len, csum;
|
||
unsigned char header[3];
|
||
unsigned char inbuf[500];
|
||
|
||
strcpy (buf, "timeout");
|
||
|
||
if (forever)
|
||
{
|
||
timeout = watchdog > 0 ? watchdog : -1;
|
||
}
|
||
|
||
else
|
||
timeout = sds_timeout;
|
||
|
||
#define MAX_TRIES 3
|
||
|
||
for (tries = 1; tries <= MAX_TRIES; tries++)
|
||
{
|
||
/* This can loop forever if the remote side sends us characters
|
||
continuously, but if it pauses, we'll get a zero from readchar
|
||
because of timeout. Then we'll count that as a retry. */
|
||
|
||
/* Note that we will only wait forever prior to the start of a packet.
|
||
After that, we expect characters to arrive at a brisk pace. They
|
||
should show up within sds_timeout intervals. */
|
||
|
||
do
|
||
{
|
||
c = readchar (timeout);
|
||
|
||
if (c == SERIAL_TIMEOUT)
|
||
{
|
||
if (forever) /* Watchdog went off. Kill the target. */
|
||
{
|
||
target_mourn_inferior ();
|
||
error ("Watchdog has expired. Target detached.\n");
|
||
}
|
||
if (remote_debug)
|
||
fputs_filtered ("Timed out.\n", gdb_stdlog);
|
||
goto retry;
|
||
}
|
||
}
|
||
while (c != '$' && c != '{');
|
||
|
||
/* We might have seen a "trigraph", a sequence of three characters
|
||
that indicate various sorts of communication state. */
|
||
|
||
if (c == '{')
|
||
{
|
||
/* Read the other two chars of the trigraph. */
|
||
c2 = readchar (timeout);
|
||
c3 = readchar (timeout);
|
||
if (remote_debug)
|
||
fprintf_unfiltered (gdb_stdlog, "Trigraph %c%c%c received\n",
|
||
c, c2, c3);
|
||
if (c3 == '+')
|
||
{
|
||
message_pending = 1;
|
||
return 0; /*???? */
|
||
}
|
||
continue;
|
||
}
|
||
|
||
val = read_frame (inbuf);
|
||
|
||
if (val == 1)
|
||
{
|
||
fromb64 (inbuf, header, 4);
|
||
/* (should check out other bits) */
|
||
fromb64 (inbuf + 4, buf, strlen (inbuf) - 4);
|
||
|
||
len = header[2];
|
||
|
||
csum = 0;
|
||
csum = compute_checksum (csum, buf, len);
|
||
csum = compute_checksum (csum, header + 1, 2);
|
||
|
||
if (csum != header[0])
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"Checksum mismatch: computed %d, received %d\n",
|
||
csum, header[0]);
|
||
|
||
if (header[2] == 0xff)
|
||
fprintf_unfiltered (gdb_stderr, "Requesting resend...\n");
|
||
|
||
if (remote_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"... (Got checksum %d, id %d, length %d)\n",
|
||
header[0], header[1], header[2]);
|
||
fprintf_unfiltered (gdb_stdlog, "Message received: \"");
|
||
for (i = 0; i < len; ++i)
|
||
{
|
||
fprintf_unfiltered (gdb_stdlog, "%02x", (unsigned char) buf[i]);
|
||
}
|
||
fprintf_unfiltered (gdb_stdlog, "\"\n");
|
||
}
|
||
|
||
/* no ack required? */
|
||
return len;
|
||
}
|
||
|
||
/* Try the whole thing again. */
|
||
retry:
|
||
/* need to do something here */
|
||
;
|
||
}
|
||
|
||
/* We have tried hard enough, and just can't receive the packet. Give up. */
|
||
|
||
printf_unfiltered ("Ignoring packet error, continuing...\n");
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
sds_kill (void)
|
||
{
|
||
/* Don't try to do anything to the target. */
|
||
}
|
||
|
||
static void
|
||
sds_mourn (void)
|
||
{
|
||
unpush_target (&sds_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static void
|
||
sds_create_inferior (char *exec_file, char *args, char **env)
|
||
{
|
||
inferior_ptid = pid_to_ptid (42000);
|
||
|
||
/* Clean up from the last time we were running. */
|
||
clear_proceed_status ();
|
||
|
||
/* Let the remote process run. */
|
||
proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
static void
|
||
sds_load (char *filename, int from_tty)
|
||
{
|
||
generic_load (filename, from_tty);
|
||
|
||
inferior_ptid = null_ptid;
|
||
}
|
||
|
||
/* The SDS monitor has commands for breakpoint insertion, although it
|
||
it doesn't actually manage the breakpoints, it just returns the
|
||
replaced instruction back to the debugger. */
|
||
|
||
static int
|
||
sds_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
|
||
{
|
||
int i, retlen;
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
|
||
p = buf;
|
||
*p++ = 16;
|
||
*p++ = 0;
|
||
*p++ = (int) (addr >> 24) & 0xff;
|
||
*p++ = (int) (addr >> 16) & 0xff;
|
||
*p++ = (int) (addr >> 8) & 0xff;
|
||
*p++ = (int) (addr) & 0xff;
|
||
|
||
retlen = sds_send (buf, p - buf);
|
||
|
||
for (i = 0; i < 4; ++i)
|
||
contents_cache[i] = buf[i + 2];
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
sds_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
|
||
{
|
||
int i, retlen;
|
||
unsigned char *p, buf[PBUFSIZ];
|
||
|
||
p = buf;
|
||
*p++ = 17;
|
||
*p++ = 0;
|
||
*p++ = (int) (addr >> 24) & 0xff;
|
||
*p++ = (int) (addr >> 16) & 0xff;
|
||
*p++ = (int) (addr >> 8) & 0xff;
|
||
*p++ = (int) (addr) & 0xff;
|
||
for (i = 0; i < 4; ++i)
|
||
*p++ = contents_cache[i];
|
||
|
||
retlen = sds_send (buf, p - buf);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
init_sds_ops (void)
|
||
{
|
||
sds_ops.to_shortname = "sds";
|
||
sds_ops.to_longname = "Remote serial target with SDS protocol";
|
||
sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\
|
||
Specify the serial device it is connected to (e.g. /dev/ttya).";
|
||
sds_ops.to_open = sds_open;
|
||
sds_ops.to_close = sds_close;
|
||
sds_ops.to_detach = sds_detach;
|
||
sds_ops.to_resume = sds_resume;
|
||
sds_ops.to_wait = sds_wait;
|
||
sds_ops.to_fetch_registers = sds_fetch_registers;
|
||
sds_ops.to_store_registers = sds_store_registers;
|
||
sds_ops.to_prepare_to_store = sds_prepare_to_store;
|
||
sds_ops.to_xfer_memory = sds_xfer_memory;
|
||
sds_ops.to_files_info = sds_files_info;
|
||
sds_ops.to_insert_breakpoint = sds_insert_breakpoint;
|
||
sds_ops.to_remove_breakpoint = sds_remove_breakpoint;
|
||
sds_ops.to_kill = sds_kill;
|
||
sds_ops.to_load = sds_load;
|
||
sds_ops.to_create_inferior = sds_create_inferior;
|
||
sds_ops.to_mourn_inferior = sds_mourn;
|
||
sds_ops.to_stratum = process_stratum;
|
||
sds_ops.to_has_all_memory = 1;
|
||
sds_ops.to_has_memory = 1;
|
||
sds_ops.to_has_stack = 1;
|
||
sds_ops.to_has_registers = 1;
|
||
sds_ops.to_has_execution = 1;
|
||
sds_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
/* Put a command string, in args, out to the monitor and display the
|
||
reply message. */
|
||
|
||
static void
|
||
sds_command (char *args, int from_tty)
|
||
{
|
||
char *p;
|
||
int i, len, retlen;
|
||
unsigned char buf[1000];
|
||
|
||
/* Convert hexadecimal chars into a byte buffer. */
|
||
p = args;
|
||
len = 0;
|
||
while (*p != '\0')
|
||
{
|
||
buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
if (p[1] == '\0')
|
||
break;
|
||
p += 2;
|
||
}
|
||
|
||
retlen = sds_send (buf, len);
|
||
|
||
printf_filtered ("Reply is ");
|
||
for (i = 0; i < retlen; ++i)
|
||
{
|
||
printf_filtered ("%02x", buf[i]);
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
|
||
void
|
||
_initialize_remote_sds (void)
|
||
{
|
||
init_sds_ops ();
|
||
add_target (&sds_ops);
|
||
|
||
add_show_from_set (add_set_cmd ("sdstimeout", no_class,
|
||
var_integer, (char *) &sds_timeout,
|
||
"Set timeout value for sds read.\n", &setlist),
|
||
&showlist);
|
||
|
||
add_com ("sds", class_obscure, sds_command,
|
||
"Send a command to the SDS monitor.");
|
||
}
|