1 /* Memory-access and commands for remote NINDY process, for GDB.
2 Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
3 Contributed by Intel Corporation. Modified from remote.c by Chris Benenati.
5 GDB is distributed in the hope that it will be useful, but WITHOUT ANY
6 WARRANTY. No author or distributor accepts responsibility to anyone
7 for the consequences of using it or for whether it serves any
8 particular purpose or works at all, unless he says so in writing.
9 Refer to the GDB General Public License for full details.
11 Everyone is granted permission to copy, modify and redistribute GDB,
12 but only under the conditions described in the GDB General Public
13 License. A copy of this license is supposed to have been given to you
14 along with GDB so you can know your rights and responsibilities. It
15 should be in a file named COPYING. Among other things, the copyright
16 notice and this notice must be preserved on all copies.
18 In other words, go ahead and share GDB, but don't try to stop
19 anyone else from sharing it farther. Help stamp out software hoarding!
23 Except for the data cache routines, this file bears little resemblence
24 to remote.c. A new (although similar) protocol has been specified, and
25 portions of the code are entirely dependent on having an i80960 with a
26 NINDY ROM monitor at the other end of the line.
29 /*****************************************************************************
31 * REMOTE COMMUNICATION PROTOCOL BETWEEN GDB960 AND THE NINDY ROM MONITOR.
37 * As far as NINDY is concerned, GDB is always in one of two modes: command
38 * mode or passthrough mode.
40 * In command mode (the default) pre-defined packets containing requests
41 * are sent by GDB to NINDY. NINDY never talks except in reponse to a request.
43 * Once the the user program is started, GDB enters passthrough mode, to give
44 * the user program access to the terminal. GDB remains in this mode until
45 * NINDY indicates that the program has stopped.
51 * GDB writes all input received from the keyboard directly to NINDY, and writes
52 * all characters received from NINDY directly to the monitor.
54 * Keyboard input is neither buffered nor echoed to the monitor.
56 * GDB remains in passthrough mode until NINDY sends a single ^P character,
57 * to indicate that the user process has stopped.
60 * GDB assumes NINDY performs a 'flushreg' when the user program stops.
66 * All info (except for message ack and nak) is transferred between gdb
67 * and the remote processor in messages of the following format:
72 * # is a literal character
74 * <info> ASCII information; all numeric information is in the
75 * form of hex digits ('0'-'9' and lowercase 'a'-'f').
78 * is a pair of ASCII hex digits representing an 8-bit
79 * checksum formed by adding together each of the
80 * characters in <info>.
82 * The receiver of a message always sends a single character to the sender
83 * to indicate that the checksum was good ('+') or bad ('-'); the sender
84 * re-transmits the entire message over until a '+' is received.
86 * In response to a command NINDY always sends back either data or
87 * a result code of the form "Xnn", where "nn" are hex digits and "X00"
88 * means no errors. (Exceptions: the "s" and "c" commands don't respond.)
90 * SEE THE HEADER OF THE FILE "gdb.c" IN THE NINDY MONITOR SOURCE CODE FOR A
91 * FULL DESCRIPTION OF LEGAL COMMANDS.
93 * SEE THE FILE "stop.h" IN THE NINDY MONITOR SOURCE CODE FOR A LIST
96 ***************************************************************************/
100 #include <sys/types.h>
104 #include "inferior.h"
110 #include "floatformat.h"
113 #include <sys/file.h>
116 #include "nindy-share/env.h"
117 #include "nindy-share/stop.h"
120 #include "remote-utils.h"
122 static DCACHE *nindy_dcache;
125 extern char *getenv();
126 extern char *mktemp();
128 extern void generic_mourn_inferior ();
130 extern struct target_ops nindy_ops;
131 extern GDB_FILE *instream;
133 extern char ninStopWhy ();
134 extern int ninMemGet ();
135 extern int ninMemPut ();
137 int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */
138 int nindy_old_protocol; /* nonzero if want to use old protocol */
139 char *nindy_ttyname; /* name of tty to talk to nindy on, or null */
141 #define DLE '\020' /* Character NINDY sends to indicate user program has
146 /* From nindy-share/nindy.c. */
147 extern serial_t nindy_serial;
149 static int have_regs = 0; /* 1 iff regs read since i960 last halted */
150 static int regs_changed = 0; /* 1 iff regs were modified since last read */
152 extern char *exists();
155 nindy_fetch_registers PARAMS ((int));
158 nindy_store_registers PARAMS ((int));
160 static char *savename;
163 nindy_close (quitting)
166 if (nindy_serial != NULL)
167 SERIAL_CLOSE (nindy_serial);
175 /* Open a connection to a remote debugger.
176 FIXME, there should be "set" commands for the options that are
177 now specified with gdb command-line options (old_protocol,
180 nindy_open (name, from_tty)
181 char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */
187 error_no_arg ("serial port device name");
189 target_preopen (from_tty);
193 have_regs = regs_changed = 0;
194 nindy_dcache = dcache_init(ninMemGet, ninMemPut);
196 /* Allow user to interrupt the following -- we could hang if there's
197 no NINDY at the other end of the remote tty. */
199 /* If baud_rate is -1, then ninConnect will not recognize the baud rate
200 and will deal with the situation in a (more or less) reasonable
202 sprintf(baudrate, "%d", baud_rate);
203 ninConnect(name, baudrate,
204 nindy_initial_brk, !from_tty, nindy_old_protocol);
207 if (nindy_serial == NULL)
209 perror_with_name (name);
212 savename = savestring (name, strlen (name));
213 push_target (&nindy_ops);
214 target_fetch_registers(-1);
217 /* User-initiated quit of nindy operations. */
220 nindy_detach (name, from_tty)
225 error ("Too many arguments");
232 /* FIXME: this lies about the baud rate if we autobauded. */
233 printf_unfiltered("\tAttached to %s at %d bits per second%s%s.\n", savename,
235 nindy_old_protocol? " in old protocol": "",
236 nindy_initial_brk? " with initial break": "");
239 /* Return the number of characters in the buffer before
240 the first DLE character. */
245 char *buf; /* Character buffer; NOT '\0'-terminated */
246 int n; /* Number of characters in buffer */
250 for ( i = 0; i < n; i++ ){
251 if ( buf[i] == DLE ){
258 /* Tell the remote machine to resume. */
261 nindy_resume (pid, step, siggnal)
263 enum target_signal siggnal;
265 if (siggnal != TARGET_SIGNAL_0 && siggnal != stop_signal)
266 warning ("Can't send signals to remote NINDY targets.");
268 dcache_flush(nindy_dcache);
270 nindy_store_registers (-1);
277 /* FIXME, we can probably use the normal terminal_inferior stuff here.
278 We have to do terminal_inferior and then set up the passthrough
279 settings initially. Thereafter, terminal_ours and terminal_inferior
280 will automatically swap the settings around for us. */
282 struct clean_up_tty_args {
283 serial_ttystate state;
288 clean_up_tty (ptrarg)
291 struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg;
292 SERIAL_SET_TTY_STATE (args->serial, args->state);
295 You may need to reset the 80960 and/or reload your program.\n");
298 /* Wait until the remote machine stops. While waiting, operate in passthrough
299 * mode; i.e., pass everything NINDY sends to gdb_stdout, and everything from
302 * Return to caller, storing status in 'status' just as `wait' would.
306 nindy_wait( pid, status )
308 struct target_waitstatus *status;
311 char buf[500]; /* FIXME, what is "500" here? */
313 unsigned char stop_exit;
314 unsigned char stop_code;
315 struct clean_up_tty_args tty_args;
316 struct cleanup *old_cleanups;
317 long ip_value, fp_value, sp_value; /* Reg values from stop */
319 status->kind = TARGET_WAITKIND_EXITED;
320 status->value.integer = 0;
322 /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */
324 /* Save current tty attributes, and restore them when done. */
325 tty_args.serial = SERIAL_FDOPEN (0);
326 tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial);
327 old_cleanups = make_cleanup (clean_up_tty, &tty_args);
329 /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret
330 <CR> and perform echo. */
331 /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close
333 SERIAL_RAW (tty_args.serial);
337 /* Wait for input on either the remote port or stdin. */
340 FD_SET (nindy_serial->fd, &fds);
341 if (select (nindy_serial->fd + 1, &fds, 0, 0, 0) <= 0)
344 /* Pass input through to correct place */
345 if (FD_ISSET (0, &fds))
348 n = read (0, buf, sizeof (buf));
351 SERIAL_WRITE (nindy_serial, buf, n );
355 if (FD_ISSET (nindy_serial->fd, &fds))
357 /* Input on remote */
358 n = read (nindy_serial->fd, buf, sizeof (buf));
361 /* Write out any characters in buffer preceding DLE */
362 i = non_dle( buf, n );
370 /* There *was* a DLE in the buffer */
371 stop_exit = ninStopWhy(&stop_code,
372 &ip_value, &fp_value, &sp_value);
373 if (!stop_exit && (stop_code == STOP_SRQ))
381 /* Get out of loop */
382 supply_register (IP_REGNUM,
384 supply_register (FP_REGNUM,
386 supply_register (SP_REGNUM,
395 do_cleanups (old_cleanups);
399 status->kind = TARGET_WAITKIND_EXITED;
400 status->value.integer = stop_code;
404 status->kind = TARGET_WAITKIND_STOPPED;
405 status->value.sig = i960_fault_to_signal (stop_code);
410 /* Read the remote registers into the block REGS. */
412 /* This is the block that ninRegsGet and ninRegsPut handles. */
414 char local_regs[16 * 4];
415 char global_regs[16 * 4];
419 char fp_as_double[4 * 8];
423 nindy_fetch_registers(regno)
426 struct nindy_regs nindy_regs;
431 ninRegsGet( (char *) &nindy_regs );
434 memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4);
435 memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4);
436 memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4);
437 memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4);
438 memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4);
439 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
440 dub = unpack_double (builtin_type_double,
441 &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
443 /* dub now in host byte order */
444 floatformat_from_double (&floatformat_i960_ext, &dub,
445 ®isters[REGISTER_BYTE (regnum)]);
448 registers_fetched ();
452 nindy_prepare_to_store()
454 /* Fetch all regs if they aren't already here. */
455 read_register_bytes (0, NULL, REGISTER_BYTES);
459 nindy_store_registers(regno)
462 struct nindy_regs nindy_regs;
466 memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4);
467 memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4);
468 memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4);
469 memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4);
470 memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4);
471 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++)
473 floatformat_to_double (&floatformat_i960_ext,
474 ®isters[REGISTER_BYTE (regnum)], &dub);
475 store_floating (&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
476 REGISTER_VIRTUAL_SIZE (regnum),
481 ninRegsPut( (char *) &nindy_regs );
485 /* Read a word from remote address ADDR and return it.
486 * This goes through the data cache.
489 nindy_fetch_word (addr)
492 return dcache_fetch (nindy_dcache, addr);
495 /* Write a word WORD into remote address ADDR.
496 This goes through the data cache. */
499 nindy_store_word (addr, word)
503 dcache_poke (nindy_dcache, addr, word);
506 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
507 to debugger memory starting at MYADDR. Copy to inferior if
508 WRITE is nonzero. Returns the length copied.
510 This is stolen almost directly from infptrace.c's child_xfer_memory,
511 which also deals with a word-oriented memory interface. Sometime,
512 FIXME, rewrite this to not use the word-oriented routines. */
515 nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target)
520 struct target_ops *target; /* ignored */
523 /* Round starting address down to longword boundary. */
524 register CORE_ADDR addr = memaddr & - sizeof (int);
525 /* Round ending address up; get number of longwords that makes. */
527 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
528 /* Allocate buffer of that many longwords. */
529 register int *buffer = (int *) alloca (count * sizeof (int));
533 /* Fill start and end extra bytes of buffer with existing memory data. */
535 if (addr != memaddr || len < (int)sizeof (int)) {
536 /* Need part of initial word -- fetch it. */
537 buffer[0] = nindy_fetch_word (addr);
540 if (count > 1) /* FIXME, avoid if even boundary */
543 = nindy_fetch_word (addr + (count - 1) * sizeof (int));
546 /* Copy data to be written over corresponding part of buffer */
548 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
550 /* Write the entire buffer. */
552 for (i = 0; i < count; i++, addr += sizeof (int))
555 nindy_store_word (addr, buffer[i]);
562 /* Read all the longwords */
563 for (i = 0; i < count; i++, addr += sizeof (int))
566 buffer[i] = nindy_fetch_word (addr);
572 /* Copy appropriate bytes out of the buffer. */
573 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
579 nindy_create_inferior (execfile, args, env)
588 error ("Can't pass arguments to remote NINDY process");
590 if (execfile == 0 || exec_bfd == 0)
591 error ("No exec file specified");
593 entry_pt = (int) bfd_get_start_address (exec_bfd);
597 /* The "process" (board) is already stopped awaiting our commands, and
598 the program is already downloaded. We just set its PC and go. */
600 inferior_pid = pid; /* Needed for wait_for_inferior below */
602 clear_proceed_status ();
604 /* Tell wait_for_inferior that we've started a new process. */
605 init_wait_for_inferior ();
607 /* Set up the "saved terminal modes" of the inferior
608 based on what modes we are starting it with. */
609 target_terminal_init ();
611 /* Install inferior's terminal modes. */
612 target_terminal_inferior ();
614 /* insert_step_breakpoint (); FIXME, do we need this? */
616 proceed ((CORE_ADDR)entry_pt, TARGET_SIGNAL_DEFAULT, 0);
620 reset_command(args, from_tty)
624 if (nindy_serial == NULL)
626 error( "No target system to reset -- use 'target nindy' command.");
628 if ( query("Really reset the target system?",0,0) )
630 SERIAL_SEND_BREAK (nindy_serial);
631 tty_flush (nindy_serial);
636 nindy_kill (args, from_tty)
640 return; /* Ignore attempts to kill target system */
643 /* Clean up when a program exits.
645 The program actually lives on in the remote processor's RAM, and may be
646 run again without a download. Don't leave it full of breakpoint
650 nindy_mourn_inferior ()
652 remove_breakpoints ();
653 unpush_target (&nindy_ops);
654 generic_mourn_inferior (); /* Do all the proper things now */
657 /* Pass the args the way catch_errors wants them. */
659 nindy_open_stub (arg)
670 target_load (arg, 1);
674 /* This routine is run as a hook, just before the main command loop is
675 entered. If gdb is configured for the i960, but has not had its
676 nindy target specified yet, this will loop prompting the user to do so.
678 Unlike the loop provided by Intel, we actually let the user get out
679 of this with a RETURN. This is useful when e.g. simply examining
680 an i960 object file on the host system. */
683 nindy_before_main_loop ()
688 while (current_target != &nindy_ops) { /* remote tty not specified yet */
689 if ( instream == stdin ){
690 printf_unfiltered("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: ");
691 gdb_flush( gdb_stdout );
693 fgets( ttyname, sizeof(ttyname)-1, stdin );
695 /* Strip leading and trailing whitespace */
696 for ( p = ttyname; isspace(*p); p++ ){
700 return; /* User just hit spaces or return, wants out */
702 for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){
706 if ( STREQ("quit",p) ){
710 if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL))
712 /* Now that we have a tty open for talking to the remote machine,
713 download the executable file if one was specified. */
716 catch_errors (load_stub, bfd_get_filename (exec_bfd), "",
723 /* Define the target subroutine names */
725 struct target_ops nindy_ops = {
726 "nindy", "Remote serial target in i960 NINDY-specific protocol",
727 "Use a remote i960 system running NINDY connected by a serial line.\n\
728 Specify the name of the device the serial line is connected to.\n\
729 The speed (baud rate), whether to use the old NINDY protocol,\n\
730 and whether to send a break on startup, are controlled by options\n\
731 specified when you started GDB.",
732 nindy_open, nindy_close,
737 nindy_fetch_registers, nindy_store_registers,
738 nindy_prepare_to_store,
739 nindy_xfer_inferior_memory, nindy_files_info,
740 0, 0, /* insert_breakpoint, remove_breakpoint, */
741 0, 0, 0, 0, 0, /* Terminal crud */
744 0, /* lookup_symbol */
745 nindy_create_inferior,
746 nindy_mourn_inferior,
748 0, /* notice_signals */
749 process_stratum, 0, /* next */
750 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
751 0, 0, /* Section pointers */
752 OPS_MAGIC, /* Always the last thing */
758 add_target (&nindy_ops);
759 add_com ("reset", class_obscure, reset_command,
760 "Send a 'break' to the remote target system.\n\
761 Only useful if the target has been equipped with a circuit\n\
762 to perform a hard reset when a break is detected.");