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"
112 #include "gdb_wait.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;
124 extern int unlink ();
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;
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 ();
154 static void nindy_fetch_registers (int);
156 static void nindy_store_registers (int);
158 static char *savename;
161 nindy_close (quitting)
164 if (nindy_serial != NULL)
165 SERIAL_CLOSE (nindy_serial);
173 /* Open a connection to a remote debugger.
174 FIXME, there should be "set" commands for the options that are
175 now specified with gdb command-line options (old_protocol,
178 nindy_open (name, from_tty)
179 char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */
185 error_no_arg ("serial port device name");
187 target_preopen (from_tty);
191 have_regs = regs_changed = 0;
192 nindy_dcache = dcache_init (ninMemGet, ninMemPut);
194 /* Allow user to interrupt the following -- we could hang if there's
195 no NINDY at the other end of the remote tty. */
197 /* If baud_rate is -1, then ninConnect will not recognize the baud rate
198 and will deal with the situation in a (more or less) reasonable
200 sprintf (baudrate, "%d", 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);
213 target_fetch_registers (-1);
216 init_wait_for_inferior ();
217 clear_proceed_status ();
221 /* User-initiated quit of nindy operations. */
224 nindy_detach (name, from_tty)
229 error ("Too many arguments");
236 /* FIXME: this lies about the baud rate if we autobauded. */
237 printf_unfiltered ("\tAttached to %s at %d bits per second%s%s.\n", savename,
239 nindy_old_protocol ? " in old protocol" : "",
240 nindy_initial_brk ? " with initial break" : "");
243 /* Return the number of characters in the buffer before
244 the first DLE character. */
249 char *buf; /* Character buffer; NOT '\0'-terminated */
250 int n; /* Number of characters in buffer */
254 for (i = 0; i < n; i++)
264 /* Tell the remote machine to resume. */
267 nindy_resume (pid, step, siggnal)
269 enum target_signal siggnal;
271 if (siggnal != TARGET_SIGNAL_0 && siggnal != stop_signal)
272 warning ("Can't send signals to remote NINDY targets.");
274 dcache_flush (nindy_dcache);
277 nindy_store_registers (-1);
284 /* FIXME, we can probably use the normal terminal_inferior stuff here.
285 We have to do terminal_inferior and then set up the passthrough
286 settings initially. Thereafter, terminal_ours and terminal_inferior
287 will automatically swap the settings around for us. */
289 struct clean_up_tty_args
291 serial_ttystate state;
294 static struct clean_up_tty_args tty_args;
297 clean_up_tty (ptrarg)
300 struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg;
301 SERIAL_SET_TTY_STATE (args->serial, args->state);
303 warning ("\n\nYou may need to reset the 80960 and/or reload your program.\n");
306 /* Recover from ^Z or ^C while remote process is running */
307 static void (*old_ctrlc) ();
309 static void (*old_ctrlz) ();
315 SERIAL_SET_TTY_STATE (tty_args.serial, tty_args.state);
316 free (tty_args.state);
318 signal (SIGINT, old_ctrlc);
320 signal (SIGTSTP, old_ctrlz);
322 error ("\n\nYou may need to reset the 80960 and/or reload your program.\n");
325 /* Wait until the remote machine stops. While waiting, operate in passthrough
326 * mode; i.e., pass everything NINDY sends to gdb_stdout, and everything from
329 * Return to caller, storing status in 'status' just as `wait' would.
333 nindy_wait (pid, status)
335 struct target_waitstatus *status;
341 unsigned char stop_exit;
342 unsigned char stop_code;
343 struct cleanup *old_cleanups;
344 long ip_value, fp_value, sp_value; /* Reg values from stop */
346 status->kind = TARGET_WAITKIND_EXITED;
347 status->value.integer = 0;
349 /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */
351 /* Save current tty attributes, and restore them when done. */
352 tty_args.serial = SERIAL_FDOPEN (0);
353 tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial);
354 old_ctrlc = signal (SIGINT, clean_up_int);
356 old_ctrlz = signal (SIGTSTP, clean_up_int);
359 old_cleanups = make_cleanup (clean_up_tty, &tty_args);
361 /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret
362 <CR> and perform echo. */
363 /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close
365 SERIAL_RAW (tty_args.serial);
369 /* Input on remote */
370 c = SERIAL_READCHAR (nindy_serial, -1);
371 if (c == SERIAL_ERROR)
373 error ("Cannot read from serial line");
375 else if (c == 0x1b) /* ESC */
377 c = SERIAL_READCHAR (nindy_serial, -1);
380 else if (c != 0x10) /* DLE */
381 /* Write out any characters preceding DLE */
388 stop_exit = ninStopWhy (&stop_code,
389 &ip_value, &fp_value, &sp_value);
390 if (!stop_exit && (stop_code == STOP_SRQ))
398 /* Get out of loop */
399 supply_register (IP_REGNUM,
401 supply_register (FP_REGNUM,
403 supply_register (SP_REGNUM,
410 SERIAL_SET_TTY_STATE (tty_args.serial, tty_args.state);
411 free (tty_args.state);
412 discard_cleanups (old_cleanups);
416 status->kind = TARGET_WAITKIND_EXITED;
417 status->value.integer = stop_code;
421 /* nindy has some special stop code need to be handled */
422 if (stop_code == STOP_GDB_BPT)
423 stop_code = TRACE_STEP;
424 status->kind = TARGET_WAITKIND_STOPPED;
425 status->value.sig = i960_fault_to_signal (stop_code);
430 /* Read the remote registers into the block REGS. */
432 /* This is the block that ninRegsGet and ninRegsPut handles. */
435 char local_regs[16 * 4];
436 char global_regs[16 * 4];
440 char fp_as_double[4 * 8];
444 nindy_fetch_registers (regno)
447 struct nindy_regs nindy_regs;
451 ninRegsGet ((char *) &nindy_regs);
454 memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16 * 4);
455 memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16 * 4);
456 memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2 * 4);
457 memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1 * 4);
458 memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1 * 4);
459 memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], nindy_regs.fp_as_double, 4 * 8);
461 registers_fetched ();
465 nindy_prepare_to_store ()
467 /* Fetch all regs if they aren't already here. */
468 read_register_bytes (0, NULL, REGISTER_BYTES);
472 nindy_store_registers (regno)
475 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 memcpy (nindy_regs.fp_as_double, ®isters[REGISTER_BYTE (FP0_REGNUM)], 8 * 4);
486 ninRegsPut ((char *) &nindy_regs);
490 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
491 to debugger memory starting at MYADDR. Copy to inferior if
492 SHOULD_WRITE is nonzero. Returns the length copied. */
495 nindy_xfer_inferior_memory (memaddr, myaddr, len, should_write, target)
500 struct target_ops *target; /* ignored */
504 return dcache_xfer_memory (nindy_dcache, memaddr, myaddr,
509 nindy_create_inferior (execfile, args, env)
518 error ("Can't pass arguments to remote NINDY process");
520 if (execfile == 0 || exec_bfd == 0)
521 error ("No executable file specified");
523 entry_pt = (int) bfd_get_start_address (exec_bfd);
527 /* The "process" (board) is already stopped awaiting our commands, and
528 the program is already downloaded. We just set its PC and go. */
530 inferior_pid = pid; /* Needed for wait_for_inferior below */
532 clear_proceed_status ();
534 /* Tell wait_for_inferior that we've started a new process. */
535 init_wait_for_inferior ();
537 /* Set up the "saved terminal modes" of the inferior
538 based on what modes we are starting it with. */
539 target_terminal_init ();
541 /* Install inferior's terminal modes. */
542 target_terminal_inferior ();
544 /* insert_step_breakpoint (); FIXME, do we need this? */
546 proceed ((CORE_ADDR) entry_pt, TARGET_SIGNAL_DEFAULT, 0);
550 reset_command (args, from_tty)
554 if (nindy_serial == NULL)
556 error ("No target system to reset -- use 'target nindy' command.");
558 if (query ("Really reset the target system?", 0, 0))
560 SERIAL_SEND_BREAK (nindy_serial);
561 tty_flush (nindy_serial);
566 nindy_kill (args, from_tty)
570 return; /* Ignore attempts to kill target system */
573 /* Clean up when a program exits.
575 The program actually lives on in the remote processor's RAM, and may be
576 run again without a download. Don't leave it full of breakpoint
580 nindy_mourn_inferior ()
582 remove_breakpoints ();
583 unpush_target (&nindy_ops);
584 generic_mourn_inferior (); /* Do all the proper things now */
587 /* Pass the args the way catch_errors wants them. */
589 nindy_open_stub (arg)
597 nindy_load (filename, from_tty)
602 /* Can't do unix style forking on a VMS system, so we'll use bfd to do
606 bfd *file = bfd_openr (filename, 0);
609 perror_with_name (filename);
613 if (!bfd_check_format (file, bfd_object))
615 error ("can't prove it's an object file\n");
619 for (s = file->sections; s; s = s->next)
621 if (s->flags & SEC_LOAD)
623 char *buffer = xmalloc (s->_raw_size);
624 bfd_get_section_contents (file, s, buffer, 0, s->_raw_size);
625 printf ("Loading section %s, size %x vma %x\n",
629 ninMemPut (s->vma, buffer, s->_raw_size);
640 target_load (arg, 1);
644 /* This routine is run as a hook, just before the main command loop is
645 entered. If gdb is configured for the i960, but has not had its
646 nindy target specified yet, this will loop prompting the user to do so.
648 Unlike the loop provided by Intel, we actually let the user get out
649 of this with a RETURN. This is useful when e.g. simply examining
650 an i960 object file on the host system. */
653 nindy_before_main_loop ()
658 while (target_stack->target_ops != &nindy_ops) /* What is this crap??? */
659 { /* remote tty not specified yet */
660 if (instream == stdin)
662 printf_unfiltered ("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: ");
663 gdb_flush (gdb_stdout);
665 fgets (ttyname, sizeof (ttyname) - 1, stdin);
667 /* Strip leading and trailing whitespace */
668 for (p = ttyname; isspace (*p); p++)
674 return; /* User just hit spaces or return, wants out */
676 for (p2 = p; !isspace (*p2) && (*p2 != '\0'); p2++)
681 if (STREQ ("quit", p))
686 if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL))
688 /* Now that we have a tty open for talking to the remote machine,
689 download the executable file if one was specified. */
692 catch_errors (load_stub, bfd_get_filename (exec_bfd), "",
699 /* Define the target subroutine names */
701 struct target_ops nindy_ops;
704 init_nindy_ops (void)
706 nindy_ops.to_shortname = "nindy";
707 "Remote serial target in i960 NINDY-specific protocol",
708 nindy_ops.to_longname = "Use a remote i960 system running NINDY connected by a serial line.\n\
709 Specify the name of the device the serial line is connected to.\n\
710 The speed (baud rate), whether to use the old NINDY protocol,\n\
711 and whether to send a break on startup, are controlled by options\n\
712 specified when you started GDB.";
713 nindy_ops.to_doc = "";
714 nindy_ops.to_open = nindy_open;
715 nindy_ops.to_close = nindy_close;
716 nindy_ops.to_attach = 0;
717 nindy_ops.to_post_attach = NULL;
718 nindy_ops.to_require_attach = NULL;
719 nindy_ops.to_detach = nindy_detach;
720 nindy_ops.to_require_detach = NULL;
721 nindy_ops.to_resume = nindy_resume;
722 nindy_ops.to_wait = nindy_wait;
723 nindy_ops.to_post_wait = NULL;
724 nindy_ops.to_fetch_registers = nindy_fetch_registers;
725 nindy_ops.to_store_registers = nindy_store_registers;
726 nindy_ops.to_prepare_to_store = nindy_prepare_to_store;
727 nindy_ops.to_xfer_memory = nindy_xfer_inferior_memory;
728 nindy_ops.to_files_info = nindy_files_info;
729 nindy_ops.to_insert_breakpoint = memory_insert_breakpoint;
730 nindy_ops.to_remove_breakpoint = memory_remove_breakpoint;
731 nindy_ops.to_terminal_init = 0;
732 nindy_ops.to_terminal_inferior = 0;
733 nindy_ops.to_terminal_ours_for_output = 0;
734 nindy_ops.to_terminal_ours = 0;
735 nindy_ops.to_terminal_info = 0; /* Terminal crud */
736 nindy_ops.to_kill = nindy_kill;
737 nindy_ops.to_load = nindy_load;
738 nindy_ops.to_lookup_symbol = 0; /* lookup_symbol */
739 nindy_ops.to_create_inferior = nindy_create_inferior;
740 nindy_ops.to_post_startup_inferior = NULL;
741 nindy_ops.to_acknowledge_created_inferior = NULL;
742 nindy_ops.to_clone_and_follow_inferior = NULL;
743 nindy_ops.to_post_follow_inferior_by_clone = NULL;
744 nindy_ops.to_insert_fork_catchpoint = NULL;
745 nindy_ops.to_remove_fork_catchpoint = NULL;
746 nindy_ops.to_insert_vfork_catchpoint = NULL;
747 nindy_ops.to_remove_vfork_catchpoint = NULL;
748 nindy_ops.to_has_forked = NULL;
749 nindy_ops.to_has_vforked = NULL;
750 nindy_ops.to_can_follow_vfork_prior_to_exec = NULL;
751 nindy_ops.to_post_follow_vfork = NULL;
752 nindy_ops.to_insert_exec_catchpoint = NULL;
753 nindy_ops.to_remove_exec_catchpoint = NULL;
754 nindy_ops.to_has_execd = NULL;
755 nindy_ops.to_reported_exec_events_per_exec_call = NULL;
756 nindy_ops.to_has_exited = NULL;
757 nindy_ops.to_mourn_inferior = nindy_mourn_inferior;
758 nindy_ops.to_can_run = 0; /* can_run */
759 nindy_ops.to_notice_signals = 0; /* notice_signals */
760 nindy_ops.to_thread_alive = 0; /* to_thread_alive */
761 nindy_ops.to_stop = 0; /* to_stop */
762 nindy_ops.to_pid_to_exec_file = NULL;
763 nindy_ops.to_core_file_to_sym_file = NULL;
764 nindy_ops.to_stratum = process_stratum;
765 nindy_ops.DONT_USE = 0; /* next */
766 nindy_ops.to_has_all_memory = 1;
767 nindy_ops.to_has_memory = 1;
768 nindy_ops.to_has_stack = 1;
769 nindy_ops.to_has_registers = 1;
770 nindy_ops.to_has_execution = 1; /* all mem, mem, stack, regs, exec */
771 nindy_ops.to_sections = 0;
772 nindy_ops.to_sections_end = 0; /* Section pointers */
773 nindy_ops.to_magic = OPS_MAGIC; /* Always the last thing */
780 add_target (&nindy_ops);
781 add_com ("reset", class_obscure, reset_command,
782 "Send a 'break' to the remote target system.\n\
783 Only useful if the target has been equipped with a circuit\n\
784 to perform a hard reset when a break is detected.");