961 lines
25 KiB
C
961 lines
25 KiB
C
/* Memory-access and commands for remote NINDY process, for GDB.
|
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Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
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Contributed by Intel Corporation. Modified from remote.c by Chris Benenati.
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GDB is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY. No author or distributor accepts responsibility to anyone
|
||
for the consequences of using it or for whether it serves any
|
||
particular purpose or works at all, unless he says so in writing.
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||
Refer to the GDB General Public License for full details.
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||
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||
Everyone is granted permission to copy, modify and redistribute GDB,
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but only under the conditions described in the GDB General Public
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||
License. A copy of this license is supposed to have been given to you
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along with GDB so you can know your rights and responsibilities. It
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||
should be in a file named COPYING. Among other things, the copyright
|
||
notice and this notice must be preserved on all copies.
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In other words, go ahead and share GDB, but don't try to stop
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anyone else from sharing it farther. Help stamp out software hoarding!
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*/
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/*
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Except for the data cache routines, this file bears little resemblence
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to remote.c. A new (although similar) protocol has been specified, and
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portions of the code are entirely dependent on having an i80960 with a
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NINDY ROM monitor at the other end of the line.
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*/
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/*****************************************************************************
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*
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* REMOTE COMMUNICATION PROTOCOL BETWEEN GDB960 AND THE NINDY ROM MONITOR.
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*
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*
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* MODES OF OPERATION
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* ----- -- ---------
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*
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* As far as NINDY is concerned, GDB is always in one of two modes: command
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* mode or passthrough mode.
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*
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* In command mode (the default) pre-defined packets containing requests
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* are sent by GDB to NINDY. NINDY never talks except in reponse to a request.
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*
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* Once the the user program is started, GDB enters passthrough mode, to give
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* the user program access to the terminal. GDB remains in this mode until
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* NINDY indicates that the program has stopped.
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*
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*
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* PASSTHROUGH MODE
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* ----------- ----
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*
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* GDB writes all input received from the keyboard directly to NINDY, and writes
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* all characters received from NINDY directly to the monitor.
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*
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* Keyboard input is neither buffered nor echoed to the monitor.
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*
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* GDB remains in passthrough mode until NINDY sends a single ^P character,
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* to indicate that the user process has stopped.
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*
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* Note:
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* GDB assumes NINDY performs a 'flushreg' when the user program stops.
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*
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*
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* COMMAND MODE
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* ------- ----
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*
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* All info (except for message ack and nak) is transferred between gdb
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* and the remote processor in messages of the following format:
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*
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* <info>#<checksum>
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*
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* where
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* # is a literal character
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*
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* <info> ASCII information; all numeric information is in the
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* form of hex digits ('0'-'9' and lowercase 'a'-'f').
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*
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* <checksum>
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* is a pair of ASCII hex digits representing an 8-bit
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* checksum formed by adding together each of the
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* characters in <info>.
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*
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* The receiver of a message always sends a single character to the sender
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* to indicate that the checksum was good ('+') or bad ('-'); the sender
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* re-transmits the entire message over until a '+' is received.
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*
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* In response to a command NINDY always sends back either data or
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* a result code of the form "Xnn", where "nn" are hex digits and "X00"
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* means no errors. (Exceptions: the "s" and "c" commands don't respond.)
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*
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* SEE THE HEADER OF THE FILE "gdb.c" IN THE NINDY MONITOR SOURCE CODE FOR A
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* FULL DESCRIPTION OF LEGAL COMMANDS.
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*
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* SEE THE FILE "stop.h" IN THE NINDY MONITOR SOURCE CODE FOR A LIST
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* OF STOP CODES.
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*
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******************************************************************************/
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#include <stdio.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <setjmp.h>
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#include "defs.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 "gdbcore.h"
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#include "command.h"
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#include "bfd.h"
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#include "ieee-float.h"
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#include "wait.h"
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <ctype.h>
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#include "nindy-share/ttycntl.h"
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#include "nindy-share/demux.h"
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#include "nindy-share/env.h"
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#include "nindy-share/stop.h"
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extern int unlink();
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extern char *getenv();
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extern char *mktemp();
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extern char *coffstrip();
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extern void generic_mourn_inferior ();
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extern struct target_ops nindy_ops;
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extern jmp_buf to_top_level;
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extern FILE *instream;
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extern struct ext_format ext_format_i960; /* i960-tdep.c */
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extern char ninStopWhy ();
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int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */
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int nindy_old_protocol; /* nonzero if want to use old protocol */
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char *nindy_ttyname; /* name of tty to talk to nindy on, or null */
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#define DLE '\020' /* Character NINDY sends to indicate user program has
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* halted. */
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#define TRUE 1
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#define FALSE 0
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int nindy_fd = 0; /* Descriptor for I/O to NINDY */
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static int have_regs = 0; /* 1 iff regs read since i960 last halted */
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static int regs_changed = 0; /* 1 iff regs were modified since last read */
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extern char *exists();
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static void dcache_flush (), dcache_poke (), dcache_init();
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static int dcache_fetch ();
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/* FIXME, we can probably use the normal terminal_inferior stuff here.
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We have to do terminal_inferior and then set up the passthrough
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settings initially. Thereafter, terminal_ours and terminal_inferior
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will automatically swap the settings around for us. */
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/* Restore TTY to normal operation */
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static TTY_STRUCT orig_tty; /* TTY attributes before entering passthrough */
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static void
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restore_tty()
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{
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ioctl( 0, TIOCSETN, &orig_tty );
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}
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/* Recover from ^Z or ^C while remote process is running */
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static void (*old_ctrlc)(); /* Signal handlers before entering passthrough */
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#ifdef SIGTSTP
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static void (*old_ctrlz)();
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#endif
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static
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#ifdef USG
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void
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#endif
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cleanup()
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{
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restore_tty();
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signal(SIGINT, old_ctrlc);
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#ifdef SIGTSTP
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signal(SIGTSTP, old_ctrlz);
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#endif
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error("\n\nYou may need to reset the 80960 and/or reload your program.\n");
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}
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/* Clean up anything that needs cleaning when losing control. */
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static char *savename;
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static void
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nindy_close (quitting)
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int quitting;
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{
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if (nindy_fd)
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close (nindy_fd);
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nindy_fd = 0;
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if (savename)
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free (savename);
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savename = 0;
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}
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/* Open a connection to a remote debugger.
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FIXME, there should be a way to specify the various options that are
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now specified with gdb command-line options. (baud_rate, old_protocol,
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and initial_brk) */
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void
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nindy_open (name, from_tty)
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char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */
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int from_tty;
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{
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if (!name)
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error_no_arg ("serial port device name");
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target_preopen (from_tty);
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nindy_close (0);
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have_regs = regs_changed = 0;
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dcache_init();
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/* Allow user to interrupt the following -- we could hang if
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* there's no NINDY at the other end of the remote tty.
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*/
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immediate_quit++;
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nindy_fd = ninConnect( name, baud_rate? baud_rate: "9600",
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nindy_initial_brk, !from_tty, nindy_old_protocol );
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immediate_quit--;
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if ( nindy_fd < 0 ){
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nindy_fd = 0;
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error( "Can't open tty '%s'", name );
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}
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savename = savestring (name, strlen (name));
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push_target (&nindy_ops);
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target_fetch_registers(-1);
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}
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/* User-initiated quit of nindy operations. */
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static void
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nindy_detach (name, from_tty)
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char *name;
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int from_tty;
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{
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if (name)
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error ("Too many arguments");
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pop_target ();
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}
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static void
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nindy_files_info ()
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{
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printf("\tAttached to %s at %s bps%s%s.\n", savename,
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baud_rate? baud_rate: "9600",
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nindy_old_protocol? " in old protocol": "",
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nindy_initial_brk? " with initial break": "");
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}
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/******************************************************************************
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* remote_load:
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* Download an object file to the remote system by invoking the "comm960"
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* utility. We look for "comm960" in $G960BIN, $G960BASE/bin, and
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* DEFAULT_BASE/bin/HOST/bin where
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* DEFAULT_BASE is defined in env.h, and
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* HOST must be defined on the compiler invocation line.
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******************************************************************************/
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static void
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nindy_load( filename, from_tty )
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char *filename;
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int from_tty;
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{
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char *tmpfile;
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struct cleanup *old_chain;
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char *scratch_pathname;
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int scratch_chan;
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if (!filename)
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filename = get_exec_file (1);
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filename = tilde_expand (filename);
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make_cleanup (free, filename);
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scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
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&scratch_pathname);
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if (scratch_chan < 0)
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perror_with_name (filename);
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close (scratch_chan); /* Slightly wasteful FIXME */
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have_regs = regs_changed = 0;
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mark_breakpoints_out();
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inferior_pid = 0;
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dcache_flush();
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tmpfile = coffstrip(scratch_pathname);
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if ( tmpfile ){
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old_chain = make_cleanup (unlink,tmpfile);
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immediate_quit++;
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ninDownload( tmpfile, !from_tty );
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/* FIXME, don't we want this merged in here? */
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immediate_quit--;
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do_cleanups (old_chain);
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}
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}
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/* Return the number of characters in the buffer before the first DLE character.
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*/
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static
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int
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non_dle( buf, n )
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char *buf; /* Character buffer; NOT '\0'-terminated */
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int n; /* Number of characters in buffer */
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{
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int i;
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for ( i = 0; i < n; i++ ){
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if ( buf[i] == DLE ){
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break;
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}
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}
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return i;
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}
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/* Tell the remote machine to resume. */
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void
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nindy_resume (step, siggnal)
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int step, siggnal;
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{
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if (siggnal != 0 && siggnal != stop_signal)
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error ("Can't send signals to remote NINDY targets.");
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dcache_flush();
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if ( regs_changed ){
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nindy_store_registers ();
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regs_changed = 0;
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}
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have_regs = 0;
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ninGo( step );
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}
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/* Wait until the remote machine stops. While waiting, operate in passthrough
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* mode; i.e., pass everything NINDY sends to stdout, and everything from
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* stdin to NINDY.
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*
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* Return to caller, storing status in 'status' just as `wait' would.
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*/
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void
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nindy_wait( status )
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WAITTYPE *status;
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{
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DEMUX_DECL; /* OS-dependent data needed by DEMUX... macros */
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char buf[500]; /* FIXME, what is "500" here? */
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int i, n;
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unsigned char stop_exit;
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unsigned char stop_code;
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TTY_STRUCT tty;
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long ip_value, fp_value, sp_value; /* Reg values from stop */
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WSETEXIT( (*status), 0 );
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/* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */
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||
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/* Save current tty attributes, set up signals to restore them.
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*/
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ioctl( 0, TIOCGETP, &orig_tty );
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old_ctrlc = signal( SIGINT, cleanup );
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#ifdef SIGTSTP
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old_ctrlz = signal( SIGTSTP, cleanup );
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#endif
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||
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/* Pass input from keyboard to NINDY as it arrives.
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* NINDY will interpret <CR> and perform echo.
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*/
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tty = orig_tty;
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TTY_NINDYTERM( tty );
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ioctl( 0, TIOCSETN, &tty );
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||
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||
while ( 1 ){
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/* Go to sleep until there's something for us on either
|
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* the remote port or stdin.
|
||
*/
|
||
|
||
DEMUX_WAIT( nindy_fd );
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||
|
||
/* Pass input through to correct place */
|
||
|
||
n = DEMUX_READ( 0, buf, sizeof(buf) );
|
||
if ( n ){ /* Input on stdin */
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write( nindy_fd, buf, n );
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||
}
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||
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||
n = DEMUX_READ( nindy_fd, buf, sizeof(buf) );
|
||
if ( n ){ /* Input on remote */
|
||
/* Write out any characters in buffer preceding DLE */
|
||
i = non_dle( buf, n );
|
||
if ( i > 0 ){
|
||
write( 1, buf, i );
|
||
}
|
||
|
||
if ( i != n ){
|
||
/* There *was* a DLE in the buffer */
|
||
stop_exit = ninStopWhy( &stop_code,
|
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&ip_value, &fp_value, &sp_value);
|
||
if ( !stop_exit && (stop_code==STOP_SRQ) ){
|
||
immediate_quit++;
|
||
ninSrq();
|
||
immediate_quit--;
|
||
} else {
|
||
/* Get out of loop */
|
||
supply_register (IP_REGNUM, &ip_value);
|
||
supply_register (FP_REGNUM, &fp_value);
|
||
supply_register (SP_REGNUM, &sp_value);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
signal( SIGINT, old_ctrlc );
|
||
#ifdef SIGTSTP
|
||
signal( SIGTSTP, old_ctrlz );
|
||
#endif
|
||
restore_tty();
|
||
|
||
if ( stop_exit ){ /* User program exited */
|
||
WSETEXIT( (*status), stop_code );
|
||
} else { /* Fault or trace */
|
||
switch (stop_code){
|
||
case STOP_GDB_BPT:
|
||
case TRACE_STEP:
|
||
/* Make it look like a VAX trace trap */
|
||
stop_code = SIGTRAP;
|
||
break;
|
||
default:
|
||
/* The target is not running Unix, and its
|
||
faults/traces do not map nicely into Unix signals.
|
||
Make sure they do not get confused with Unix signals
|
||
by numbering them with values higher than the highest
|
||
legal Unix signal. code in i960_print_fault(),
|
||
called via PRINT_RANDOM_SIGNAL, will interpret the
|
||
value. */
|
||
stop_code += NSIG;
|
||
break;
|
||
}
|
||
WSETSTOP( (*status), stop_code );
|
||
}
|
||
}
|
||
|
||
/* Read the remote registers into the block REGS. */
|
||
|
||
/* This is the block that ninRegsGet and ninRegsPut handles. */
|
||
struct nindy_regs {
|
||
char local_regs[16 * 4];
|
||
char global_regs[16 * 4];
|
||
char pcw_acw[2 * 4];
|
||
char ip[4];
|
||
char tcw[4];
|
||
char fp_as_double[4 * 8];
|
||
};
|
||
|
||
static int
|
||
nindy_fetch_registers(regno)
|
||
int regno;
|
||
{
|
||
struct nindy_regs nindy_regs;
|
||
int regnum, inv;
|
||
double dub;
|
||
|
||
immediate_quit++;
|
||
ninRegsGet( (char *) &nindy_regs );
|
||
immediate_quit--;
|
||
|
||
bcopy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4);
|
||
bcopy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4);
|
||
bcopy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4);
|
||
bcopy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4);
|
||
bcopy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4);
|
||
for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
|
||
dub = unpack_double (builtin_type_double,
|
||
&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
|
||
&inv);
|
||
/* dub now in host byte order */
|
||
double_to_ieee_extended (&ext_format_i960, &dub,
|
||
®isters[REGISTER_BYTE (regnum)]);
|
||
}
|
||
|
||
registers_fetched ();
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
nindy_prepare_to_store()
|
||
{
|
||
nindy_fetch_registers(-1);
|
||
}
|
||
|
||
static int
|
||
nindy_store_registers(regno)
|
||
int regno;
|
||
{
|
||
struct nindy_regs nindy_regs;
|
||
int regnum, inv;
|
||
double dub;
|
||
|
||
bcopy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4);
|
||
bcopy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4);
|
||
bcopy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4);
|
||
bcopy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4);
|
||
bcopy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4);
|
||
/* Float regs. Only works on IEEE_FLOAT hosts. */
|
||
for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
|
||
ieee_extended_to_double (&ext_format_i960,
|
||
®isters[REGISTER_BYTE (regnum)], &dub);
|
||
/* dub now in host byte order */
|
||
/* FIXME-someday, the arguments to unpack_double are backward.
|
||
It expects a target double and returns a host; we pass the opposite.
|
||
This mostly works but not quite. */
|
||
dub = unpack_double (builtin_type_double, &dub, &inv);
|
||
/* dub now in target byte order */
|
||
bcopy ((char *)&dub, &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
|
||
8);
|
||
}
|
||
|
||
immediate_quit++;
|
||
ninRegsPut( (char *) &nindy_regs );
|
||
immediate_quit--;
|
||
return 0;
|
||
}
|
||
|
||
/* Read a word from remote address ADDR and return it.
|
||
* This goes through the data cache.
|
||
*/
|
||
int
|
||
nindy_fetch_word (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
return dcache_fetch (addr);
|
||
}
|
||
|
||
/* Write a word WORD into remote address ADDR.
|
||
This goes through the data cache. */
|
||
|
||
void
|
||
nindy_store_word (addr, word)
|
||
CORE_ADDR addr;
|
||
int word;
|
||
{
|
||
dcache_poke (addr, word);
|
||
}
|
||
|
||
/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
|
||
to debugger memory starting at MYADDR. Copy to inferior if
|
||
WRITE is nonzero. Returns the length copied.
|
||
|
||
This is stolen almost directly from infptrace.c's child_xfer_memory,
|
||
which also deals with a word-oriented memory interface. Sometime,
|
||
FIXME, rewrite this to not use the word-oriented routines. */
|
||
|
||
int
|
||
nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int write;
|
||
struct target_ops *target; /* ignored */
|
||
{
|
||
register int i;
|
||
/* Round starting address down to longword boundary. */
|
||
register CORE_ADDR addr = memaddr & - sizeof (int);
|
||
/* Round ending address up; get number of longwords that makes. */
|
||
register int count
|
||
= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
|
||
/* Allocate buffer of that many longwords. */
|
||
register int *buffer = (int *) alloca (count * sizeof (int));
|
||
|
||
if (write)
|
||
{
|
||
/* Fill start and end extra bytes of buffer with existing memory data. */
|
||
|
||
if (addr != memaddr || len < (int)sizeof (int)) {
|
||
/* Need part of initial word -- fetch it. */
|
||
buffer[0] = nindy_fetch_word (addr);
|
||
}
|
||
|
||
if (count > 1) /* FIXME, avoid if even boundary */
|
||
{
|
||
buffer[count - 1]
|
||
= nindy_fetch_word (addr + (count - 1) * sizeof (int));
|
||
}
|
||
|
||
/* Copy data to be written over corresponding part of buffer */
|
||
|
||
bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
|
||
|
||
/* Write the entire buffer. */
|
||
|
||
for (i = 0; i < count; i++, addr += sizeof (int))
|
||
{
|
||
errno = 0;
|
||
nindy_store_word (addr, buffer[i]);
|
||
if (errno)
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Read all the longwords */
|
||
for (i = 0; i < count; i++, addr += sizeof (int))
|
||
{
|
||
errno = 0;
|
||
buffer[i] = nindy_fetch_word (addr);
|
||
if (errno)
|
||
return 0;
|
||
QUIT;
|
||
}
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
|
||
}
|
||
return len;
|
||
}
|
||
|
||
/* 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.
|
||
*/
|
||
static
|
||
struct dcache_block *
|
||
dcache_hit (addr)
|
||
unsigned int 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. */
|
||
static
|
||
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 or keep it on the valid list,
|
||
and return its address. The caller should store into the block
|
||
the address and data that it describes, then remque it from the
|
||
free list and insert it into the valid list. This procedure
|
||
prevents errors from creeping in if a ninMemGet is interrupted
|
||
(which used to put garbage blocks in the valid list...). */
|
||
static
|
||
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 and put
|
||
it on the free list. */
|
||
db = dcache_valid.last;
|
||
remque (db);
|
||
insque (db, &dcache_free);
|
||
}
|
||
|
||
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. */
|
||
static
|
||
int
|
||
dcache_fetch (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
register struct dcache_block *db;
|
||
|
||
db = dcache_hit (addr);
|
||
if (db == 0)
|
||
{
|
||
db = dcache_alloc ();
|
||
immediate_quit++;
|
||
ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16);
|
||
immediate_quit--;
|
||
db->addr = addr & ~0xf;
|
||
remque (db); /* Off the free list */
|
||
insque (db, &dcache_valid); /* On the valid list */
|
||
}
|
||
return (dcache_value (db, addr));
|
||
}
|
||
|
||
/* Write the word at ADDR both in the data cache and in the remote machine. */
|
||
static void
|
||
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 ();
|
||
immediate_quit++;
|
||
ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16);
|
||
immediate_quit--;
|
||
db->addr = addr & ~0xf;
|
||
remque (db); /* Off the free list */
|
||
insque (db, &dcache_valid); /* On the valid list */
|
||
}
|
||
|
||
/* Modify the word in the cache. */
|
||
db->data[(addr>>2)&3] = data;
|
||
|
||
/* Send the changed word. */
|
||
immediate_quit++;
|
||
ninMemPut(addr, (unsigned char *)&data, 4);
|
||
immediate_quit--;
|
||
}
|
||
|
||
/* The cache itself. */
|
||
struct dcache_block the_cache[DCACHE_SIZE];
|
||
|
||
/* Initialize the data cache. */
|
||
static void
|
||
dcache_init ()
|
||
{
|
||
register i;
|
||
register struct dcache_block *db;
|
||
|
||
db = the_cache;
|
||
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);
|
||
}
|
||
|
||
|
||
static void
|
||
nindy_create_inferior (execfile, args, env)
|
||
char *execfile;
|
||
char *args;
|
||
char **env;
|
||
{
|
||
int entry_pt;
|
||
int pid;
|
||
|
||
if (args && *args)
|
||
error ("Can't pass arguments to remote NINDY process");
|
||
|
||
if (execfile == 0 || exec_bfd == 0)
|
||
error ("No exec file specified");
|
||
|
||
entry_pt = (int) bfd_get_start_address (exec_bfd);
|
||
|
||
pid = 42;
|
||
|
||
#ifdef CREATE_INFERIOR_HOOK
|
||
CREATE_INFERIOR_HOOK (pid);
|
||
#endif
|
||
|
||
/* The "process" (board) is already stopped awaiting our commands, and
|
||
the program is already downloaded. We just set its PC and go. */
|
||
|
||
inferior_pid = pid; /* Needed for wait_for_inferior below */
|
||
|
||
clear_proceed_status ();
|
||
|
||
/* Tell wait_for_inferior that we've started a new process. */
|
||
init_wait_for_inferior ();
|
||
|
||
/* Set up the "saved terminal modes" of the inferior
|
||
based on what modes we are starting it with. */
|
||
target_terminal_init ();
|
||
|
||
/* Install inferior's terminal modes. */
|
||
target_terminal_inferior ();
|
||
|
||
/* insert_step_breakpoint (); FIXME, do we need this? */
|
||
proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */
|
||
}
|
||
|
||
static void
|
||
reset_command(args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if ( !nindy_fd ){
|
||
error( "No target system to reset -- use 'target nindy' command.");
|
||
}
|
||
if ( query("Really reset the target system?",0,0) ){
|
||
send_break( nindy_fd );
|
||
tty_flush( nindy_fd );
|
||
}
|
||
}
|
||
|
||
void
|
||
nindy_kill (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
return; /* Ignore attempts to kill target system */
|
||
}
|
||
|
||
/* Clean up when a program exits.
|
||
|
||
The program actually lives on in the remote processor's RAM, and may be
|
||
run again without a download. Don't leave it full of breakpoint
|
||
instructions. */
|
||
|
||
void
|
||
nindy_mourn_inferior ()
|
||
{
|
||
remove_breakpoints ();
|
||
generic_mourn_inferior (); /* Do all the proper things now */
|
||
}
|
||
|
||
/* This routine is run as a hook, just before the main command loop is
|
||
entered. If gdb is configured for the i960, but has not had its
|
||
nindy target specified yet, this will loop prompting the user to do so.
|
||
|
||
Unlike the loop provided by Intel, we actually let the user get out
|
||
of this with a RETURN. This is useful when e.g. simply examining
|
||
an i960 object file on the host system. */
|
||
|
||
nindy_before_main_loop ()
|
||
{
|
||
char ttyname[100];
|
||
char *p, *p2;
|
||
|
||
setjmp(to_top_level);
|
||
while (current_target != &nindy_ops) { /* remote tty not specified yet */
|
||
if ( instream == stdin ){
|
||
printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: ");
|
||
fflush( stdout );
|
||
}
|
||
fgets( ttyname, sizeof(ttyname)-1, stdin );
|
||
|
||
/* Strip leading and trailing whitespace */
|
||
for ( p = ttyname; isspace(*p); p++ ){
|
||
;
|
||
}
|
||
if ( *p == '\0' ){
|
||
return; /* User just hit spaces or return, wants out */
|
||
}
|
||
for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){
|
||
;
|
||
}
|
||
*p2= '\0';
|
||
if ( !strcmp("quit",p) ){
|
||
exit(1);
|
||
}
|
||
|
||
nindy_open( p, 1 );
|
||
|
||
/* Now that we have a tty open for talking to the remote machine,
|
||
download the executable file if one was specified. */
|
||
if ( !setjmp(to_top_level) && exec_bfd ) {
|
||
target_load (bfd_get_filename (exec_bfd), 1);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Define the target subroutine names */
|
||
|
||
struct target_ops nindy_ops = {
|
||
"nindy", "Remote serial target in i960 NINDY-specific protocol",
|
||
"Use a remote i960 system running NINDY connected by a serial line.\n\
|
||
Specify the name of the device the serial line is connected to.\n\
|
||
The speed (baud rate), whether to use the old NINDY protocol,\n\
|
||
and whether to send a break on startup, are controlled by options\n\
|
||
specified when you started GDB.",
|
||
nindy_open, nindy_close,
|
||
0, nindy_detach, nindy_resume, nindy_wait,
|
||
nindy_fetch_registers, nindy_store_registers,
|
||
nindy_prepare_to_store, 0, 0, /* conv_from, conv_to */
|
||
nindy_xfer_inferior_memory, nindy_files_info,
|
||
0, 0, /* insert_breakpoint, remove_breakpoint, */
|
||
0, 0, 0, 0, 0, /* Terminal crud */
|
||
nindy_kill,
|
||
nindy_load,
|
||
0, /* lookup_symbol */
|
||
nindy_create_inferior,
|
||
nindy_mourn_inferior,
|
||
process_stratum, 0, /* next */
|
||
1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
|
||
0, 0, /* Section pointers */
|
||
OPS_MAGIC, /* Always the last thing */
|
||
};
|
||
|
||
void
|
||
_initialize_nindy ()
|
||
{
|
||
add_target (&nindy_ops);
|
||
add_com ("reset", class_obscure, reset_command,
|
||
"Send a 'break' to the remote target system.\n\
|
||
Only useful if the target has been equipped with a circuit\n\
|
||
to perform a hard reset when a break is detected.");
|
||
}
|