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 GDB_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 "set" commands for the options that are
178 now specified with gdb command-line options (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 /* If baud_rate is -1, then ninConnect will not recognize the baud rate
201 and will deal with the situation in a (more or less) reasonable
203 sprintf(baudrate, "%d", baud_rate);
204 ninConnect(name, baudrate,
205 nindy_initial_brk, !from_tty, nindy_old_protocol);
208 if (nindy_serial == NULL)
210 perror_with_name (name);
213 savename = savestring (name, strlen (name));
214 push_target (&nindy_ops);
215 target_fetch_registers(-1);
218 /* User-initiated quit of nindy operations. */
221 nindy_detach (name, from_tty)
226 error ("Too many arguments");
233 /* FIXME: this lies about the baud rate if we autobauded. */
234 printf_unfiltered("\tAttached to %s at %d bits per second%s%s.\n", savename,
236 nindy_old_protocol? " in old protocol": "",
237 nindy_initial_brk? " with initial break": "");
240 /* Return the number of characters in the buffer before
241 the first DLE character. */
246 char *buf; /* Character buffer; NOT '\0'-terminated */
247 int n; /* Number of characters in buffer */
251 for ( i = 0; i < n; i++ ){
252 if ( buf[i] == DLE ){
259 /* Tell the remote machine to resume. */
262 nindy_resume (pid, step, siggnal)
264 enum target_signal siggnal;
266 if (siggnal != TARGET_SIGNAL_0 && siggnal != stop_signal)
267 warning ("Can't send signals to remote NINDY targets.");
269 dcache_flush(nindy_dcache);
271 nindy_store_registers (-1);
278 /* FIXME, we can probably use the normal terminal_inferior stuff here.
279 We have to do terminal_inferior and then set up the passthrough
280 settings initially. Thereafter, terminal_ours and terminal_inferior
281 will automatically swap the settings around for us. */
283 struct clean_up_tty_args {
284 serial_ttystate state;
289 clean_up_tty (ptrarg)
292 struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg;
293 SERIAL_SET_TTY_STATE (args->serial, args->state);
296 You may need to reset the 80960 and/or reload your program.\n");
299 /* Wait until the remote machine stops. While waiting, operate in passthrough
300 * mode; i.e., pass everything NINDY sends to gdb_stdout, and everything from
303 * Return to caller, storing status in 'status' just as `wait' would.
307 nindy_wait( pid, status )
309 struct target_waitstatus *status;
312 char buf[500]; /* FIXME, what is "500" here? */
314 unsigned char stop_exit;
315 unsigned char stop_code;
316 struct clean_up_tty_args tty_args;
317 struct cleanup *old_cleanups;
318 long ip_value, fp_value, sp_value; /* Reg values from stop */
320 status->kind = TARGET_WAITKIND_EXITED;
321 status->value.integer = 0;
323 /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */
325 /* Save current tty attributes, and restore them when done. */
326 tty_args.serial = SERIAL_FDOPEN (0);
327 tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial);
328 old_cleanups = make_cleanup (clean_up_tty, &tty_args);
330 /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret
331 <CR> and perform echo. */
332 /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close
334 SERIAL_RAW (tty_args.serial);
338 /* Wait for input on either the remote port or stdin. */
341 FD_SET (nindy_serial->fd, &fds);
342 if (select (nindy_serial->fd + 1, &fds, 0, 0, 0) <= 0)
345 /* Pass input through to correct place */
346 if (FD_ISSET (0, &fds))
349 n = read (0, buf, sizeof (buf));
352 SERIAL_WRITE (nindy_serial, buf, n );
356 if (FD_ISSET (nindy_serial->fd, &fds))
358 /* Input on remote */
359 n = read (nindy_serial->fd, buf, sizeof (buf));
362 /* Write out any characters in buffer preceding DLE */
363 i = non_dle( buf, n );
371 /* There *was* a DLE in the buffer */
372 stop_exit = ninStopWhy(&stop_code,
373 &ip_value, &fp_value, &sp_value);
374 if (!stop_exit && (stop_code == STOP_SRQ))
382 /* Get out of loop */
383 supply_register (IP_REGNUM,
385 supply_register (FP_REGNUM,
387 supply_register (SP_REGNUM,
396 do_cleanups (old_cleanups);
400 status->kind = TARGET_WAITKIND_EXITED;
401 status->value.integer = stop_code;
405 status->kind = TARGET_WAITKIND_STOPPED;
406 status->value.sig = i960_fault_to_signal (stop_code);
411 /* Read the remote registers into the block REGS. */
413 /* This is the block that ninRegsGet and ninRegsPut handles. */
415 char local_regs[16 * 4];
416 char global_regs[16 * 4];
420 char fp_as_double[4 * 8];
424 nindy_fetch_registers(regno)
427 struct nindy_regs nindy_regs;
432 ninRegsGet( (char *) &nindy_regs );
435 memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4);
436 memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4);
437 memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4);
438 memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4);
439 memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4);
440 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) {
441 dub = unpack_double (builtin_type_double,
442 &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
444 /* dub now in host byte order */
445 double_to_ieee_extended (&ext_format_i960, &dub,
446 ®isters[REGISTER_BYTE (regnum)]);
449 registers_fetched ();
453 nindy_prepare_to_store()
455 /* Fetch all regs if they aren't already here. */
456 read_register_bytes (0, NULL, REGISTER_BYTES);
460 nindy_store_registers(regno)
463 struct nindy_regs nindy_regs;
467 memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4);
468 memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4);
469 memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4);
470 memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4);
471 memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4);
472 for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++)
474 ieee_extended_to_double (&ext_format_i960,
475 ®isters[REGISTER_BYTE (regnum)], &dub);
476 store_floating (&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)],
477 REGISTER_VIRTUAL_SIZE (regnum),
482 ninRegsPut( (char *) &nindy_regs );
486 /* Read a word from remote address ADDR and return it.
487 * This goes through the data cache.
490 nindy_fetch_word (addr)
493 return dcache_fetch (nindy_dcache, addr);
496 /* Write a word WORD into remote address ADDR.
497 This goes through the data cache. */
500 nindy_store_word (addr, word)
504 dcache_poke (nindy_dcache, addr, word);
507 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
508 to debugger memory starting at MYADDR. Copy to inferior if
509 WRITE is nonzero. Returns the length copied.
511 This is stolen almost directly from infptrace.c's child_xfer_memory,
512 which also deals with a word-oriented memory interface. Sometime,
513 FIXME, rewrite this to not use the word-oriented routines. */
516 nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target)
521 struct target_ops *target; /* ignored */
524 /* Round starting address down to longword boundary. */
525 register CORE_ADDR addr = memaddr & - sizeof (int);
526 /* Round ending address up; get number of longwords that makes. */
528 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
529 /* Allocate buffer of that many longwords. */
530 register int *buffer = (int *) alloca (count * sizeof (int));
534 /* Fill start and end extra bytes of buffer with existing memory data. */
536 if (addr != memaddr || len < (int)sizeof (int)) {
537 /* Need part of initial word -- fetch it. */
538 buffer[0] = nindy_fetch_word (addr);
541 if (count > 1) /* FIXME, avoid if even boundary */
544 = nindy_fetch_word (addr + (count - 1) * sizeof (int));
547 /* Copy data to be written over corresponding part of buffer */
549 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
551 /* Write the entire buffer. */
553 for (i = 0; i < count; i++, addr += sizeof (int))
556 nindy_store_word (addr, buffer[i]);
563 /* Read all the longwords */
564 for (i = 0; i < count; i++, addr += sizeof (int))
567 buffer[i] = nindy_fetch_word (addr);
573 /* Copy appropriate bytes out of the buffer. */
574 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
580 nindy_create_inferior (execfile, args, env)
589 error ("Can't pass arguments to remote NINDY process");
591 if (execfile == 0 || exec_bfd == 0)
592 error ("No exec file specified");
594 entry_pt = (int) bfd_get_start_address (exec_bfd);
598 /* The "process" (board) is already stopped awaiting our commands, and
599 the program is already downloaded. We just set its PC and go. */
601 inferior_pid = pid; /* Needed for wait_for_inferior below */
603 clear_proceed_status ();
605 /* Tell wait_for_inferior that we've started a new process. */
606 init_wait_for_inferior ();
608 /* Set up the "saved terminal modes" of the inferior
609 based on what modes we are starting it with. */
610 target_terminal_init ();
612 /* Install inferior's terminal modes. */
613 target_terminal_inferior ();
615 /* insert_step_breakpoint (); FIXME, do we need this? */
617 proceed ((CORE_ADDR)entry_pt, TARGET_SIGNAL_DEFAULT, 0);
621 reset_command(args, from_tty)
625 if (nindy_serial == NULL)
627 error( "No target system to reset -- use 'target nindy' command.");
629 if ( query("Really reset the target system?",0,0) )
631 SERIAL_SEND_BREAK (nindy_serial);
632 tty_flush (nindy_serial);
637 nindy_kill (args, from_tty)
641 return; /* Ignore attempts to kill target system */
644 /* Clean up when a program exits.
646 The program actually lives on in the remote processor's RAM, and may be
647 run again without a download. Don't leave it full of breakpoint
651 nindy_mourn_inferior ()
653 remove_breakpoints ();
654 unpush_target (&nindy_ops);
655 generic_mourn_inferior (); /* Do all the proper things now */
658 /* Pass the args the way catch_errors wants them. */
660 nindy_open_stub (arg)
671 target_load (arg, 1);
675 /* This routine is run as a hook, just before the main command loop is
676 entered. If gdb is configured for the i960, but has not had its
677 nindy target specified yet, this will loop prompting the user to do so.
679 Unlike the loop provided by Intel, we actually let the user get out
680 of this with a RETURN. This is useful when e.g. simply examining
681 an i960 object file on the host system. */
684 nindy_before_main_loop ()
689 while (current_target != &nindy_ops) { /* remote tty not specified yet */
690 if ( instream == stdin ){
691 printf_unfiltered("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: ");
692 gdb_flush( gdb_stdout );
694 fgets( ttyname, sizeof(ttyname)-1, stdin );
696 /* Strip leading and trailing whitespace */
697 for ( p = ttyname; isspace(*p); p++ ){
701 return; /* User just hit spaces or return, wants out */
703 for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){
707 if ( STREQ("quit",p) ){
711 if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL))
713 /* Now that we have a tty open for talking to the remote machine,
714 download the executable file if one was specified. */
717 catch_errors (load_stub, bfd_get_filename (exec_bfd), "",
724 /* Define the target subroutine names */
726 struct target_ops nindy_ops = {
727 "nindy", "Remote serial target in i960 NINDY-specific protocol",
728 "Use a remote i960 system running NINDY connected by a serial line.\n\
729 Specify the name of the device the serial line is connected to.\n\
730 The speed (baud rate), whether to use the old NINDY protocol,\n\
731 and whether to send a break on startup, are controlled by options\n\
732 specified when you started GDB.",
733 nindy_open, nindy_close,
738 nindy_fetch_registers, nindy_store_registers,
739 nindy_prepare_to_store,
740 nindy_xfer_inferior_memory, nindy_files_info,
741 0, 0, /* insert_breakpoint, remove_breakpoint, */
742 0, 0, 0, 0, 0, /* Terminal crud */
745 0, /* lookup_symbol */
746 nindy_create_inferior,
747 nindy_mourn_inferior,
749 0, /* notice_signals */
750 process_stratum, 0, /* next */
751 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
752 0, 0, /* Section pointers */
753 OPS_MAGIC, /* Always the last thing */
759 add_target (&nindy_ops);
760 add_com ("reset", class_obscure, reset_command,
761 "Send a 'break' to the remote target system.\n\
762 Only useful if the target has been equipped with a circuit\n\
763 to perform a hard reset when a break is detected.");