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fce7f2d986
like an undeclared variable to gcc.
1160 lines
26 KiB
C
1160 lines
26 KiB
C
/* Remote target communications for serial-line targets in custom GDB protocol
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Copyright 1988, 1991, 1992, 1993 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Remote communication protocol.
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All values are encoded in ascii hex digits.
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Request Packet
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read registers g
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reply XX....X Each byte of register data
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is described by two hex digits.
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Registers are in the internal order
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for GDB, and the bytes in a register
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are in the same order the machine uses.
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or ENN for an error.
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write regs GXX..XX Each byte of register data
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is described by two hex digits.
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reply OK for success
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ENN for an error
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read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
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reply XX..XX XX..XX is mem contents
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or ENN NN is errno
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write mem MAA..AA,LLLL:XX..XX
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AA..AA is address,
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LLLL is number of bytes,
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XX..XX is data
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reply OK for success
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ENN for an error
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cont cAA..AA AA..AA is address to resume
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If AA..AA is omitted,
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resume at same address.
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step sAA..AA AA..AA is address to resume
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If AA..AA is omitted,
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resume at same address.
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last signal ? Reply the current reason for stopping.
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This is the same reply as is generated
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for step or cont : SAA where AA is the
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signal number.
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There is no immediate reply to step or cont.
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The reply comes when the machine stops.
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It is SAA AA is the "signal number"
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or... TAAPPPPPPPPFFFFFFFF
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where AA is the signal number,
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PPPPPPPP is the PC (PC_REGNUM), and
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FFFFFFFF is the frame ptr (FP_REGNUM).
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kill req k
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*/
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#include "defs.h"
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#include <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 "target.h"
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#include "wait.h"
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#include "terminal.h"
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#include "gdbcmd.h"
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#if !defined(DONT_USE_REMOTE)
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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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/* Prototypes for local functions */
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static void
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remote_write_bytes PARAMS ((CORE_ADDR, char *, int));
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static void
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remote_read_bytes PARAMS ((CORE_ADDR, char *, int));
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static void
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remote_files_info PARAMS ((struct target_ops *));
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static int
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remote_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
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static void
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remote_prepare_to_store PARAMS ((void));
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static void
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remote_fetch_registers PARAMS ((int));
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static void
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remote_resume PARAMS ((int, int));
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static int
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remote_start_remote PARAMS ((char *));
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static void
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remote_open PARAMS ((char *, int));
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static void
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remote_close PARAMS ((int));
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static void
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remote_store_registers PARAMS ((int));
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static void
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getpkt PARAMS ((char *, int));
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static void
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putpkt PARAMS ((char *));
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static void
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remote_send PARAMS ((char *));
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static int
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readchar PARAMS ((void));
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static int
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remote_wait PARAMS ((WAITTYPE *));
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static int
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tohex PARAMS ((int));
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static int
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fromhex PARAMS ((int));
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static void
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remote_detach PARAMS ((char *, int));
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extern struct target_ops remote_ops; /* Forward decl */
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static int kiodebug = 0;
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static int timeout = 5;
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#if 0
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int icache;
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#endif
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/* Descriptor for I/O to remote machine. Initialize it to -1 so that
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remote_open knows that we don't have a file open when the program
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starts. */
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int remote_desc = -1;
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#define PBUFSIZ 1024
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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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/* Round up PBUFSIZ to hold all the registers, at least. */
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#if REGISTER_BYTES > MAXBUFBYTES
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#undef PBUFSIZ
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#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
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#endif
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/* Called when SIGALRM signal sent due to alarm() timeout. */
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#ifndef HAVE_TERMIO
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void
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remote_timer (signo)
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int signo;
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{
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if (kiodebug)
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printf ("remote_timer called\n");
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alarm (timeout);
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}
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#endif
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/* Clean up connection to a remote debugger. */
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/* ARGSUSED */
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static void
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remote_close (quitting)
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int quitting;
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{
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if (remote_desc >= 0)
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close (remote_desc);
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remote_desc = -1;
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}
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/* Translate baud rates from integers to damn B_codes. Unix should
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have outgrown this crap years ago, but even POSIX wouldn't buck it. */
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#ifndef B19200
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#define B19200 EXTA
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#endif
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#ifndef B38400
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#define B38400 EXTB
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#endif
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static struct {int rate, damn_b;} baudtab[] = {
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{0, B0},
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{50, B50},
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{75, B75},
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{110, B110},
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{134, B134},
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{150, B150},
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{200, B200},
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{300, B300},
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{600, B600},
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{1200, B1200},
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{1800, B1800},
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{2400, B2400},
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{4800, B4800},
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{9600, B9600},
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{19200, B19200},
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{38400, B38400},
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{-1, -1},
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};
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static int
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damn_b (rate)
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int rate;
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{
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int i;
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for (i = 0; baudtab[i].rate != -1; i++)
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if (rate == baudtab[i].rate) return baudtab[i].damn_b;
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return B38400; /* Random */
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}
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/* Stub for catch_errors. */
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static int
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remote_start_remote (dummy)
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char *dummy;
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{
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/* Ack any packet which the remote side has already sent. */
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write (remote_desc, "+\r", 2);
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putpkt ("?"); /* initiate a query from remote machine */
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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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remote_open (name, from_tty)
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char *name;
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int from_tty;
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{
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TERMINAL sg;
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int a_rate, b_rate = 0;
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int baudrate_set = 0;
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if (name == 0)
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error (
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"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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remote_close (0);
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#if 0
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dcache_init ();
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#endif
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remote_desc = open (name, O_RDWR);
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if (remote_desc < 0)
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perror_with_name (name);
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if (baud_rate)
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{
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if (sscanf (baud_rate, "%d", &a_rate) == 1)
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{
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b_rate = damn_b (a_rate);
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baudrate_set = 1;
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}
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}
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ioctl (remote_desc, TIOCGETP, &sg);
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#ifdef HAVE_TERMIO
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sg.c_cc[VMIN] = 0; /* read with timeout. */
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sg.c_cc[VTIME] = timeout * 10;
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sg.c_lflag &= ~(ICANON | ECHO);
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sg.c_cflag &= ~PARENB; /* No parity */
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sg.c_cflag |= CS8; /* 8-bit path */
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if (baudrate_set)
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sg.c_cflag = (sg.c_cflag & ~CBAUD) | b_rate;
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#else
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sg.sg_flags |= RAW | ANYP;
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sg.sg_flags &= ~ECHO;
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if (baudrate_set)
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{
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sg.sg_ispeed = b_rate;
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sg.sg_ospeed = b_rate;
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}
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#endif
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ioctl (remote_desc, TIOCSETP, &sg);
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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 (&remote_ops); /* Switch to using remote target now */
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#ifndef HAVE_TERMIO
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#ifndef NO_SIGINTERRUPT
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/* Cause SIGALRM's to make reads fail. */
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if (siginterrupt (SIGALRM, 1) != 0)
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perror ("remote_open: error in siginterrupt");
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#endif
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/* Set up read timeout timer. */
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if ((void (*)()) signal (SIGALRM, remote_timer) == (void (*)()) -1)
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perror ("remote_open: error in signal");
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#endif
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/* Start the remote connection; if error (0), discard this target. */
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immediate_quit++; /* Allow user to interrupt it */
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if (!catch_errors (remote_start_remote, (char *)0,
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"Couldn't establish connection to remote target\n"))
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pop_target();
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}
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/* remote_detach()
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takes a program previously attached to and detaches it.
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We better not have left any breakpoints
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in the program or it'll die when it hits one.
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Close the open connection to the remote debugger.
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Use this when you want to detach and do something else
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with your gdb. */
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static void
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remote_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (args)
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error ("Argument given to \"detach\" when remotely debugging.");
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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 (a)
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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");
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return -1;
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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 (nib)
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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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/* Tell the remote machine to resume. */
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static void
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remote_resume (step, siggnal)
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int step, siggnal;
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{
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char buf[PBUFSIZ];
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if (siggnal)
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error ("Can't send signals to a remote system. Try `handle %d ignore'.",
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siggnal);
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#if 0
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dcache_flush ();
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#endif
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strcpy (buf, step ? "s": "c");
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putpkt (buf);
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}
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/* Send ^C to target to halt it. Target will respond, and send us a
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packet. */
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void remote_interrupt(signo)
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int signo;
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{
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if (kiodebug)
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printf ("remote_interrupt called\n");
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write (remote_desc, "\003", 1); /* Send a ^C */
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}
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/* Wait until the remote machine stops, then return,
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storing status in STATUS just as `wait' would.
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Returns "pid" (though it's not clear what, if anything, that
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means in the case of this target). */
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static int
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remote_wait (status)
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WAITTYPE *status;
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{
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unsigned char buf[PBUFSIZ];
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void (*ofunc)();
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unsigned char *p;
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int i;
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long regno;
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char regs[MAX_REGISTER_RAW_SIZE];
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WSETEXIT ((*status), 0);
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ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
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getpkt ((char *) buf, 1);
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signal (SIGINT, ofunc);
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if (buf[0] == 'E')
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error ("Remote failure reply: %s", buf);
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if (buf[0] == 'T')
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{
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/* Expedited reply, containing Signal, {regno, reg} repeat */
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||
/* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
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ss = signal number
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n... = register number
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r... = register contents
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||
*/
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||
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p = &buf[3]; /* after Txx */
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||
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while (*p)
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{
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regno = strtol (p, &p, 16); /* Read the register number */
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||
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if (*p++ != ':'
|
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|| regno >= NUM_REGS)
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error ("Remote sent bad register number %s", buf);
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||
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i++)
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{
|
||
if (p[0] == 0 || p[1] == 0)
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error ("Remote reply is too short: %s", buf);
|
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regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
|
||
if (*p++ != ';')
|
||
error("Remote register badly formatted: %s", buf);
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||
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supply_register (regno, regs);
|
||
}
|
||
}
|
||
else if (buf[0] != 'S')
|
||
error ("Invalid remote reply: %s", buf);
|
||
|
||
WSETSTOP ((*status), (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))));
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Read the remote registers into the block REGS. */
|
||
/* Currently we just read all the registers, so we don't use regno. */
|
||
/* ARGSUSED */
|
||
static void
|
||
remote_fetch_registers (regno)
|
||
int regno;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
char regs[REGISTER_BYTES];
|
||
|
||
sprintf (buf, "g");
|
||
remote_send (buf);
|
||
|
||
/* Reply describes registers byte by byte, each byte encoded as two
|
||
hex characters. Suck them all up, then supply them to the
|
||
register cacheing/storage mechanism. */
|
||
|
||
p = buf;
|
||
for (i = 0; i < REGISTER_BYTES; i++)
|
||
{
|
||
if (p[0] == 0 || p[1] == 0)
|
||
error ("Remote reply is too short: %s", buf);
|
||
regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
supply_register (i, ®s[REGISTER_BYTE(i)]);
|
||
}
|
||
|
||
/* Prepare to store registers. Since we send them all, we have to
|
||
read out the ones we don't want to change first. */
|
||
|
||
static void
|
||
remote_prepare_to_store ()
|
||
{
|
||
/* Make sure the entire registers array is valid. */
|
||
read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
|
||
}
|
||
|
||
/* Store the remote registers from the contents of the block REGISTERS.
|
||
FIXME, eventually just store one register if that's all that is needed. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
remote_store_registers (regno)
|
||
int regno;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
buf[0] = 'G';
|
||
|
||
/* Command describes registers byte by byte,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf + 1;
|
||
for (i = 0; i < REGISTER_BYTES; i++)
|
||
{
|
||
*p++ = tohex ((registers[i] >> 4) & 0xf);
|
||
*p++ = tohex (registers[i] & 0xf);
|
||
}
|
||
*p = '\0';
|
||
|
||
remote_send (buf);
|
||
}
|
||
|
||
#if 0
|
||
/* Read a word from remote address ADDR and return it.
|
||
This goes through the data cache. */
|
||
|
||
int
|
||
remote_fetch_word (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
if (icache)
|
||
{
|
||
extern CORE_ADDR text_start, text_end;
|
||
|
||
if (addr >= text_start && addr < text_end)
|
||
{
|
||
int buffer;
|
||
xfer_core_file (addr, &buffer, sizeof (int));
|
||
return buffer;
|
||
}
|
||
}
|
||
return dcache_fetch (addr);
|
||
}
|
||
|
||
/* Write a word WORD into remote address ADDR.
|
||
This goes through the data cache. */
|
||
|
||
void
|
||
remote_store_word (addr, word)
|
||
CORE_ADDR addr;
|
||
int word;
|
||
{
|
||
dcache_poke (addr, word);
|
||
}
|
||
#endif /* 0 */
|
||
|
||
/* 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. */
|
||
|
||
static void
|
||
remote_write_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
if (len > PBUFSIZ / 2 - 20)
|
||
abort ();
|
||
|
||
sprintf (buf, "M%x,%x:", memaddr, len);
|
||
|
||
/* We send target system values byte by byte, in increasing byte addresses,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf + strlen (buf);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
*p++ = tohex ((myaddr[i] >> 4) & 0xf);
|
||
*p++ = tohex (myaddr[i] & 0xf);
|
||
}
|
||
*p = '\0';
|
||
|
||
remote_send (buf);
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
static void
|
||
remote_read_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
if (len > PBUFSIZ / 2 - 1)
|
||
abort ();
|
||
|
||
sprintf (buf, "m%x,%x", memaddr, len);
|
||
remote_send (buf);
|
||
|
||
/* Reply describes memory byte by byte,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf;
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (p[0] == 0 || p[1] == 0)
|
||
error ("Remote reply is too short: %s", buf);
|
||
myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
remote_xfer_memory(memaddr, myaddr, len, should_write, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int should_write;
|
||
struct target_ops *target; /* ignored */
|
||
{
|
||
int origlen = len;
|
||
int xfersize;
|
||
while (len > 0)
|
||
{
|
||
if (len > MAXBUFBYTES)
|
||
xfersize = MAXBUFBYTES;
|
||
else
|
||
xfersize = len;
|
||
|
||
if (should_write)
|
||
remote_write_bytes(memaddr, myaddr, xfersize);
|
||
else
|
||
remote_read_bytes (memaddr, myaddr, xfersize);
|
||
memaddr += xfersize;
|
||
myaddr += xfersize;
|
||
len -= xfersize;
|
||
}
|
||
return origlen; /* no error possible */
|
||
}
|
||
|
||
static void
|
||
remote_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
puts_filtered ("Debugging a target over a serial line.\n");
|
||
}
|
||
|
||
/*
|
||
|
||
A debug packet whose contents are <data>
|
||
is encapsulated for transmission in the form:
|
||
|
||
$ <data> # CSUM1 CSUM2
|
||
|
||
<data> must be ASCII alphanumeric and cannot include characters
|
||
'$' or '#'
|
||
|
||
CSUM1 and CSUM2 are ascii hex representation of an 8-bit
|
||
checksum of <data>, the most significant nibble is sent first.
|
||
the hex digits 0-9,a-f are used.
|
||
|
||
Receiver responds with:
|
||
|
||
+ - if CSUM is correct and ready for next packet
|
||
- - if CSUM is incorrect
|
||
|
||
*/
|
||
|
||
/* Read a single character from the remote end.
|
||
(If supported, we actually read many characters and buffer them up.)
|
||
Timeouts cause a zero (nul) to be returned. */
|
||
|
||
static int
|
||
readchar ()
|
||
{
|
||
static int inbuf_index, inbuf_count;
|
||
#define INBUFSIZE PBUFSIZ
|
||
static char inbuf[INBUFSIZE];
|
||
struct cleanup *old_chain;
|
||
|
||
if (inbuf_index >= inbuf_count)
|
||
{
|
||
#ifndef HAVE_TERMIO
|
||
extern int alarm ();
|
||
#endif
|
||
|
||
/* Time to do another read... */
|
||
inbuf_index = 0;
|
||
inbuf_count = 0;
|
||
inbuf[0] = 0; /* Just in case */
|
||
#ifdef HAVE_TERMIO
|
||
/* termio does the timeout for us. */
|
||
inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
|
||
#else
|
||
/* Cancel alarm on error. */
|
||
old_chain = make_cleanup (alarm, (char *)0);
|
||
alarm (timeout);
|
||
inbuf_count = read (remote_desc, inbuf, INBUFSIZE);
|
||
do_cleanups (old_chain); /* Cancel the alarm now. */
|
||
#endif
|
||
}
|
||
|
||
/* Just return the next character from the buffer (or a zero if we
|
||
got an error and no chars were stored in inbuf). */
|
||
return inbuf[inbuf_index++] & 0x7f;
|
||
}
|
||
|
||
/* Send the command in BUF to the remote machine,
|
||
and read the reply into BUF.
|
||
Report an error if we get an error reply. */
|
||
|
||
static void
|
||
remote_send (buf)
|
||
char *buf;
|
||
{
|
||
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
|
||
if (buf[0] == 'E')
|
||
error ("Remote failure reply: %s", buf);
|
||
}
|
||
|
||
/* Send a packet to the remote machine, with error checking.
|
||
The data of the packet is in BUF. */
|
||
|
||
static void
|
||
putpkt (buf)
|
||
char *buf;
|
||
{
|
||
int i;
|
||
unsigned char csum = 0;
|
||
char buf2[PBUFSIZ];
|
||
int cnt = strlen (buf);
|
||
char ch;
|
||
char *p;
|
||
|
||
/* Copy the packet into buffer BUF2, encapsulating it
|
||
and giving it a checksum. */
|
||
|
||
if (cnt > sizeof(buf2) - 5) /* Prosanity check */
|
||
abort();
|
||
|
||
p = buf2;
|
||
*p++ = '$';
|
||
|
||
for (i = 0; i < cnt; i++)
|
||
{
|
||
csum += buf[i];
|
||
*p++ = buf[i];
|
||
}
|
||
*p++ = '#';
|
||
*p++ = tohex ((csum >> 4) & 0xf);
|
||
*p++ = tohex (csum & 0xf);
|
||
|
||
/* Send it over and over until we get a positive ack. */
|
||
|
||
do {
|
||
if (kiodebug)
|
||
{
|
||
*p = '\0';
|
||
printf ("Sending packet: %s...", buf2); fflush(stdout);
|
||
}
|
||
write (remote_desc, buf2, p - buf2);
|
||
|
||
/* read until either a timeout occurs (\0) or '+' is read */
|
||
do {
|
||
ch = readchar ();
|
||
if (kiodebug) {
|
||
if (ch == '+')
|
||
printf("Ack\n");
|
||
else
|
||
printf ("%02X%c ", ch&0xFF, ch);
|
||
}
|
||
} while ((ch != '+') && (ch != '\0'));
|
||
} while (ch != '+');
|
||
}
|
||
|
||
/* 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 void
|
||
getpkt (buf, forever)
|
||
char *buf;
|
||
{
|
||
char *bp;
|
||
unsigned char csum;
|
||
int c = 0;
|
||
unsigned char c1, c2;
|
||
int retries = 0;
|
||
#define MAX_RETRIES 10
|
||
|
||
#if 0
|
||
/* Sorry, this will cause all hell to break loose, i.e. we'll end
|
||
up in the command loop with an inferior, but (at least if this
|
||
happens in remote_wait or some such place) without a current_frame,
|
||
having set up prev_* in wait_for_inferior, etc.
|
||
|
||
If it is necessary to have such an "emergency exit", seems like
|
||
the only plausible thing to do is to say the inferior died, and
|
||
make the user reattach if they want to. Perhaps with a prompt
|
||
asking for confirmation. */
|
||
|
||
/* allow immediate quit while reading from device, it could be hung */
|
||
immediate_quit++;
|
||
#endif /* 0 */
|
||
|
||
while (1)
|
||
{
|
||
/* 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. */
|
||
while (c != '$')
|
||
if (0 == (c = readchar()))
|
||
if (!forever)
|
||
{
|
||
if (++retries >= MAX_RETRIES)
|
||
if (kiodebug) puts_filtered ("Timed out.\n");
|
||
goto out;
|
||
}
|
||
|
||
/* Force csum to be zero here because of possible error retry. */
|
||
csum = 0;
|
||
bp = buf;
|
||
|
||
while (1)
|
||
{
|
||
c = readchar ();
|
||
if (c == '\0')
|
||
{
|
||
if (kiodebug)
|
||
puts_filtered ("Timeout in mid-packet, retrying\n");
|
||
goto whole; /* Start a new packet, count retries */
|
||
}
|
||
if (c == '$')
|
||
{
|
||
if (kiodebug)
|
||
puts_filtered ("Saw new packet start in middle of old one\n");
|
||
goto whole; /* Start a new packet, count retries */
|
||
}
|
||
if (c == '#')
|
||
break;
|
||
if (bp >= buf+PBUFSIZ-1)
|
||
{
|
||
*bp = '\0';
|
||
puts_filtered ("Remote packet too long: ");
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
goto whole;
|
||
}
|
||
*bp++ = c;
|
||
csum += c;
|
||
}
|
||
*bp = 0;
|
||
|
||
c1 = fromhex (readchar ());
|
||
c2 = fromhex (readchar ());
|
||
if ((csum & 0xff) == (c1 << 4) + c2)
|
||
break;
|
||
printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
|
||
(c1 << 4) + c2, csum & 0xff);
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
|
||
/* Try the whole thing again. */
|
||
whole:
|
||
if (++retries < MAX_RETRIES)
|
||
{
|
||
write (remote_desc, "-", 1);
|
||
}
|
||
else
|
||
{
|
||
printf ("Ignoring packet error, continuing...\n");
|
||
break;
|
||
}
|
||
}
|
||
|
||
out:
|
||
|
||
#if 0
|
||
immediate_quit--;
|
||
#endif
|
||
|
||
write (remote_desc, "+", 1);
|
||
|
||
if (kiodebug)
|
||
fprintf (stderr,"Packet received: %s\n", buf);
|
||
}
|
||
|
||
/* The data cache leads to incorrect results because it doesn't know about
|
||
volatile variables, thus making it impossible to debug functions which
|
||
use hardware registers. Therefore it is #if 0'd out. Effect on
|
||
performance is some, for backtraces of functions with a few
|
||
arguments each. For functions with many arguments, the stack
|
||
frames don't fit in the cache blocks, which makes the cache less
|
||
helpful. Disabling the cache is a big performance win for fetching
|
||
large structures, because the cache code fetched data in 16-byte
|
||
chunks. */
|
||
#if 0
|
||
/* The data cache records all the data read from the remote machine
|
||
since the last time it stopped.
|
||
|
||
Each cache block holds 16 bytes of data
|
||
starting at a multiple-of-16 address. */
|
||
|
||
#define DCACHE_SIZE 64 /* Number of cache blocks */
|
||
|
||
struct dcache_block {
|
||
struct dcache_block *next, *last;
|
||
unsigned int addr; /* Address for which data is recorded. */
|
||
int data[4];
|
||
};
|
||
|
||
struct dcache_block dcache_free, dcache_valid;
|
||
|
||
/* Free all the data cache blocks, thus discarding all cached data. */
|
||
|
||
static void
|
||
dcache_flush ()
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
while ((db = dcache_valid.next) != &dcache_valid)
|
||
{
|
||
remque (db);
|
||
insque (db, &dcache_free);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* If addr is present in the dcache, return the address of the block
|
||
* containing it.
|
||
*/
|
||
|
||
struct dcache_block *
|
||
dcache_hit (addr)
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
if (addr & 3)
|
||
abort ();
|
||
|
||
/* Search all cache blocks for one that is at this address. */
|
||
db = dcache_valid.next;
|
||
while (db != &dcache_valid)
|
||
{
|
||
if ((addr & 0xfffffff0) == db->addr)
|
||
return db;
|
||
db = db->next;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/* Return the int data at address ADDR in dcache block DC. */
|
||
|
||
int
|
||
dcache_value (db, addr)
|
||
struct dcache_block *db;
|
||
unsigned int addr;
|
||
{
|
||
if (addr & 3)
|
||
abort ();
|
||
return (db->data[(addr>>2)&3]);
|
||
}
|
||
|
||
/* Get a free cache block, put it on the valid list,
|
||
and return its address. The caller should store into the block
|
||
the address and data that it describes. */
|
||
|
||
struct dcache_block *
|
||
dcache_alloc ()
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
if ((db = dcache_free.next) == &dcache_free)
|
||
/* If we can't get one from the free list, take last valid */
|
||
db = dcache_valid.last;
|
||
|
||
remque (db);
|
||
insque (db, &dcache_valid);
|
||
return (db);
|
||
}
|
||
|
||
/* Return the contents of the word at address ADDR in the remote machine,
|
||
using the data cache. */
|
||
|
||
int
|
||
dcache_fetch (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
db = dcache_hit (addr);
|
||
if (db == 0)
|
||
{
|
||
db = dcache_alloc ();
|
||
remote_read_bytes (addr & ~0xf, db->data, 16);
|
||
db->addr = addr & ~0xf;
|
||
}
|
||
return (dcache_value (db, addr));
|
||
}
|
||
|
||
/* Write the word at ADDR both in the data cache and in the remote machine. */
|
||
|
||
dcache_poke (addr, data)
|
||
CORE_ADDR addr;
|
||
int data;
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
/* First make sure the word is IN the cache. DB is its cache block. */
|
||
db = dcache_hit (addr);
|
||
if (db == 0)
|
||
{
|
||
db = dcache_alloc ();
|
||
remote_read_bytes (addr & ~0xf, db->data, 16);
|
||
db->addr = addr & ~0xf;
|
||
}
|
||
|
||
/* Modify the word in the cache. */
|
||
db->data[(addr>>2)&3] = data;
|
||
|
||
/* Send the changed word. */
|
||
remote_write_bytes (addr, &data, 4);
|
||
}
|
||
|
||
/* Initialize the data cache. */
|
||
|
||
dcache_init ()
|
||
{
|
||
register i;
|
||
register struct dcache_block *db;
|
||
|
||
db = (struct dcache_block *) xmalloc (sizeof (struct dcache_block) *
|
||
DCACHE_SIZE);
|
||
dcache_free.next = dcache_free.last = &dcache_free;
|
||
dcache_valid.next = dcache_valid.last = &dcache_valid;
|
||
for (i=0;i<DCACHE_SIZE;i++,db++)
|
||
insque (db, &dcache_free);
|
||
}
|
||
#endif /* 0 */
|
||
|
||
/* Define the target subroutine names */
|
||
|
||
struct target_ops remote_ops = {
|
||
"remote", /* to_shortname */
|
||
"Remote serial target in gdb-specific protocol", /* to_longname */
|
||
"Use a remote computer via a serial line, using a gdb-specific protocol.\n\
|
||
Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */
|
||
remote_open, /* to_open */
|
||
remote_close, /* to_close */
|
||
NULL, /* to_attach */
|
||
remote_detach, /* to_detach */
|
||
remote_resume, /* to_resume */
|
||
remote_wait, /* to_wait */
|
||
remote_fetch_registers, /* to_fetch_registers */
|
||
remote_store_registers, /* to_store_registers */
|
||
remote_prepare_to_store, /* to_prepare_to_store */
|
||
remote_xfer_memory, /* to_xfer_memory */
|
||
remote_files_info, /* to_files_info */
|
||
NULL, /* to_insert_breakpoint */
|
||
NULL, /* to_remove_breakpoint */
|
||
NULL, /* to_terminal_init */
|
||
NULL, /* to_terminal_inferior */
|
||
NULL, /* to_terminal_ours_for_output */
|
||
NULL, /* to_terminal_ours */
|
||
NULL, /* to_terminal_info */
|
||
NULL, /* to_kill */
|
||
NULL, /* to_load */
|
||
NULL, /* to_lookup_symbol */
|
||
NULL, /* to_create_inferior */
|
||
NULL, /* to_mourn_inferior */
|
||
0, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
process_stratum, /* to_stratum */
|
||
NULL, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
NULL, /* sections */
|
||
NULL, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_remote ()
|
||
{
|
||
add_target (&remote_ops);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("remotedebug", no_class, var_boolean, (char *)&kiodebug,
|
||
"Set debugging of remote serial I/O.\n\
|
||
When enabled, each packet sent or received with the remote target\n\
|
||
is displayed.", &setlist),
|
||
&showlist);
|
||
}
|
||
|
||
#endif
|