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 "ieee-float.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 FILE *instream;
132 extern struct ext_format ext_format_i960; /* i960-tdep.c */
134 extern char ninStopWhy ();
135 extern int ninMemGet ();
136 extern int ninMemPut ();
138 int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */
139 int nindy_old_protocol; /* nonzero if want to use old protocol */
140 char *nindy_ttyname; /* name of tty to talk to nindy on, or null */
142 #define DLE '\020' /* Character NINDY sends to indicate user program has
147 /* From nindy-share/nindy.c. */
148 extern serial_t nindy_serial;
150 static int have_regs = 0; /* 1 iff regs read since i960 last halted */
151 static int regs_changed = 0; /* 1 iff regs were modified since last read */
153 extern char *exists();
156 nindy_fetch_registers PARAMS ((int));
159 nindy_store_registers PARAMS ((int));
161 static char *savename;
164 nindy_close (quitting)
167 if (nindy_serial != NULL)
168 SERIAL_CLOSE (nindy_serial);
176 /* Open a connection to a remote debugger.
177 FIXME, there should be a way to specify the various options that are
178 now specified with gdb command-line options. (baud_rate, old_protocol,
181 nindy_open (name, from_tty)
182 char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */
188 error_no_arg ("serial port device name");
190 target_preopen (from_tty);
194 have_regs = regs_changed = 0;
195 nindy_dcache = dcache_init(ninMemGet, ninMemPut);
197 /* Allow user to interrupt the following -- we could hang if there's
198 no NINDY at the other end of the remote tty. */
200 sprintf(baudrate, "%d", sr_get_baud_rate());
201 ninConnect(name, baudrate,
202 nindy_initial_brk, !from_tty, nindy_old_protocol);
205 if (nindy_serial == NULL)
207 perror_with_name (name);
210 savename = savestring (name, strlen (name));
211 push_target (&nindy_ops);
212 target_fetch_registers(-1);
215 /* User-initiated quit of nindy operations. */
218 nindy_detach (name, from_tty)
223 error ("Too many arguments");
230 printf("\tAttached to %s at %d bps%s%s.\n", savename,
232 nindy_old_protocol? " in old protocol": "",
233 nindy_initial_brk? " with initial break": "");
236 /* Return the number of characters in the buffer before
237 the first DLE character. */
242 char *buf; /* Character buffer; NOT '\0'-terminated */
243 int n; /* Number of characters in buffer */
247 for ( i = 0; i < n; i++ ){
248 if ( buf[i] == DLE ){
255 /* Tell the remote machine to resume. */
258 nindy_resume (pid, step, siggnal)
259 int pid, step, siggnal;
261 if (siggnal != 0 && siggnal != stop_signal)
262 error ("Can't send signals to remote NINDY targets.");
264 dcache_flush(nindy_dcache);
266 nindy_store_registers (-1);
273 /* FIXME, we can probably use the normal terminal_inferior stuff here.
274 We have to do terminal_inferior and then set up the passthrough
275 settings initially. Thereafter, terminal_ours and terminal_inferior
276 will automatically swap the settings around for us. */
278 struct clean_up_tty_args {
279 serial_ttystate state;
284 clean_up_tty (ptrarg)
287 struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg;
288 SERIAL_SET_TTY_STATE (args->serial, args->state);
291 You may need to reset the 80960 and/or reload your program.\n");
294 /* Wait until the remote machine stops. While waiting, operate in passthrough
295 * mode; i.e., pass everything NINDY sends to stdout, and everything from
298 * Return to caller, storing status in 'status' just as `wait' would.
302 nindy_wait( pid, status )
307 char buf[500]; /* FIXME, what is "500" here? */
309 unsigned char stop_exit;
310 unsigned char stop_code;
311 struct clean_up_tty_args tty_args;
312 struct cleanup *old_cleanups;
313 long ip_value, fp_value, sp_value; /* Reg values from stop */
315 WSETEXIT( (*status), 0 );
317 /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */
319 /* Save current tty attributes, and restore them when done. */
320 tty_args.serial = SERIAL_FDOPEN (0);
321 tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial);
322 old_cleanups = make_cleanup (clean_up_tty, &tty_args);
324 /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret
325 <CR> and perform echo. */
326 /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close
328 SERIAL_RAW (tty_args.serial);
332 /* Wait for input on either the remote port or stdin. */
335 FD_SET (nindy_serial->fd, &fds);
336 if (select (nindy_serial->fd + 1, &fds, 0, 0, 0) <= 0)
339 /* Pass input through to correct place */
340 if (FD_ISSET (0, &fds))
343 n = read (0, buf, sizeof (buf));
346 SERIAL_WRITE (nindy_serial, buf, n );
350 if (FD_ISSET (nindy_serial->fd, &fds))
352 /* Input on remote */
353 n = read (nindy_serial->fd, buf, sizeof (buf));
356 /* Write out any characters in buffer preceding DLE */
357 i = non_dle( buf, n );
365 /* There *was* a DLE in the buffer */
366 stop_exit = ninStopWhy(&stop_code,
367 &ip_value, &fp_value, &sp_value);
368 if (!stop_exit && (stop_code == STOP_SRQ))
376 /* Get out of loop */
377 supply_register (IP_REGNUM,
379 supply_register (FP_REGNUM,
381 supply_register (SP_REGNUM,
390 do_cleanups (old_cleanups);
394 /* User program exited */
395 WSETEXIT ((*status), stop_code);
404 /* Breakpoint or single stepping. */
408 /* The target is not running Unix, and its faults/traces do
409 not map nicely into Unix signals. Make sure they do not
410 get confused with Unix signals by numbering them with
411 values higher than the highest legal Unix signal. code
412 in i960_print_fault(), called via PRINT_RANDOM_SIGNAL,
413 will interpret the value. */
417 WSETSTOP ((*status), stop_code);
422 /* Read the remote registers into the block REGS. */
424 /* This is the block that ninRegsGet and ninRegsPut handles. */
426 char local_regs[16 * 4];
427 char global_regs[16 * 4];
431 char fp_as_double[4 * 8];
435 nindy_fetch_registers(regno)
438 struct nindy_regs nindy_regs;
443 ninRegsGet( (char *) &nindy_regs );
446 memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4);
447 memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4);
448 memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4);
449 memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4);
450 memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4);
451 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
452 dub = unpack_double (builtin_type_double,
453 &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
455 /* dub now in host byte order */
456 double_to_ieee_extended (&ext_format_i960, &dub,
457 ®isters[REGISTER_BYTE (regnum)]);
460 registers_fetched ();
464 nindy_prepare_to_store()
466 /* Fetch all regs if they aren't already here. */
467 read_register_bytes (0, NULL, REGISTER_BYTES);
471 nindy_store_registers(regno)
474 struct nindy_regs nindy_regs;
478 memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4);
479 memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4);
480 memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4);
481 memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4);
482 memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4);
483 /* Float regs. Only works on IEEE_FLOAT hosts. FIXME! */
484 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
485 ieee_extended_to_double (&ext_format_i960,
486 ®isters[REGISTER_BYTE (regnum)], &dub);
487 /* dub now in host byte order */
488 /* FIXME-someday, the arguments to unpack_double are backward.
489 It expects a target double and returns a host; we pass the opposite.
490 This mostly works but not quite. */
491 dub = unpack_double (builtin_type_double, (char *)&dub, &inv);
492 /* dub now in target byte order */
493 memcpy (&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], &dub, 8);
497 ninRegsPut( (char *) &nindy_regs );
501 /* Read a word from remote address ADDR and return it.
502 * This goes through the data cache.
505 nindy_fetch_word (addr)
508 return dcache_fetch (nindy_dcache, addr);
511 /* Write a word WORD into remote address ADDR.
512 This goes through the data cache. */
515 nindy_store_word (addr, word)
519 dcache_poke (nindy_dcache, addr, word);
522 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
523 to debugger memory starting at MYADDR. Copy to inferior if
524 WRITE is nonzero. Returns the length copied.
526 This is stolen almost directly from infptrace.c's child_xfer_memory,
527 which also deals with a word-oriented memory interface. Sometime,
528 FIXME, rewrite this to not use the word-oriented routines. */
531 nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target)
536 struct target_ops *target; /* ignored */
539 /* Round starting address down to longword boundary. */
540 register CORE_ADDR addr = memaddr & - sizeof (int);
541 /* Round ending address up; get number of longwords that makes. */
543 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
544 /* Allocate buffer of that many longwords. */
545 register int *buffer = (int *) alloca (count * sizeof (int));
549 /* Fill start and end extra bytes of buffer with existing memory data. */
551 if (addr != memaddr || len < (int)sizeof (int)) {
552 /* Need part of initial word -- fetch it. */
553 buffer[0] = nindy_fetch_word (addr);
556 if (count > 1) /* FIXME, avoid if even boundary */
559 = nindy_fetch_word (addr + (count - 1) * sizeof (int));
562 /* Copy data to be written over corresponding part of buffer */
564 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
566 /* Write the entire buffer. */
568 for (i = 0; i < count; i++, addr += sizeof (int))
571 nindy_store_word (addr, buffer[i]);
578 /* Read all the longwords */
579 for (i = 0; i < count; i++, addr += sizeof (int))
582 buffer[i] = nindy_fetch_word (addr);
588 /* Copy appropriate bytes out of the buffer. */
589 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
595 nindy_create_inferior (execfile, args, env)
604 error ("Can't pass arguments to remote NINDY process");
606 if (execfile == 0 || exec_bfd == 0)
607 error ("No exec file specified");
609 entry_pt = (int) bfd_get_start_address (exec_bfd);
613 /* The "process" (board) is already stopped awaiting our commands, and
614 the program is already downloaded. We just set its PC and go. */
616 inferior_pid = pid; /* Needed for wait_for_inferior below */
618 clear_proceed_status ();
620 /* Tell wait_for_inferior that we've started a new process. */
621 init_wait_for_inferior ();
623 /* Set up the "saved terminal modes" of the inferior
624 based on what modes we are starting it with. */
625 target_terminal_init ();
627 /* Install inferior's terminal modes. */
628 target_terminal_inferior ();
630 /* insert_step_breakpoint (); FIXME, do we need this? */
631 proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */
635 reset_command(args, from_tty)
639 if (nindy_serial == NULL)
641 error( "No target system to reset -- use 'target nindy' command.");
643 if ( query("Really reset the target system?",0,0) )
645 SERIAL_SEND_BREAK (nindy_serial);
646 tty_flush (nindy_serial);
651 nindy_kill (args, from_tty)
655 return; /* Ignore attempts to kill target system */
658 /* Clean up when a program exits.
660 The program actually lives on in the remote processor's RAM, and may be
661 run again without a download. Don't leave it full of breakpoint
665 nindy_mourn_inferior ()
667 remove_breakpoints ();
668 unpush_target (&nindy_ops);
669 generic_mourn_inferior (); /* Do all the proper things now */
672 /* Pass the args the way catch_errors wants them. */
674 nindy_open_stub (arg)
685 target_load (arg, 1);
689 /* This routine is run as a hook, just before the main command loop is
690 entered. If gdb is configured for the i960, but has not had its
691 nindy target specified yet, this will loop prompting the user to do so.
693 Unlike the loop provided by Intel, we actually let the user get out
694 of this with a RETURN. This is useful when e.g. simply examining
695 an i960 object file on the host system. */
698 nindy_before_main_loop ()
703 while (current_target != &nindy_ops) { /* remote tty not specified yet */
704 if ( instream == stdin ){
705 printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: ");
708 fgets( ttyname, sizeof(ttyname)-1, stdin );
710 /* Strip leading and trailing whitespace */
711 for ( p = ttyname; isspace(*p); p++ ){
715 return; /* User just hit spaces or return, wants out */
717 for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){
721 if ( STREQ("quit",p) ){
725 if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL))
727 /* Now that we have a tty open for talking to the remote machine,
728 download the executable file if one was specified. */
731 catch_errors (load_stub, bfd_get_filename (exec_bfd), "",
738 /* Define the target subroutine names */
740 struct target_ops nindy_ops = {
741 "nindy", "Remote serial target in i960 NINDY-specific protocol",
742 "Use a remote i960 system running NINDY connected by a serial line.\n\
743 Specify the name of the device the serial line is connected to.\n\
744 The speed (baud rate), whether to use the old NINDY protocol,\n\
745 and whether to send a break on startup, are controlled by options\n\
746 specified when you started GDB.",
747 nindy_open, nindy_close,
752 nindy_fetch_registers, nindy_store_registers,
753 nindy_prepare_to_store,
754 nindy_xfer_inferior_memory, nindy_files_info,
755 0, 0, /* insert_breakpoint, remove_breakpoint, */
756 0, 0, 0, 0, 0, /* Terminal crud */
759 0, /* lookup_symbol */
760 nindy_create_inferior,
761 nindy_mourn_inferior,
763 0, /* notice_signals */
764 process_stratum, 0, /* next */
765 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
766 0, 0, /* Section pointers */
767 OPS_MAGIC, /* Always the last thing */
773 add_target (&nindy_ops);
774 add_com ("reset", class_obscure, reset_command,
775 "Send a 'break' to the remote target system.\n\
776 Only useful if the target has been equipped with a circuit\n\
777 to perform a hard reset when a break is detected.");