1 /* Generic remote debugging interface for simulators.
2 Copyright 1993, 1994, 1996 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4 Steve Chamberlain (sac@cygnus.com).
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
36 #include "remote-sim.h"
37 #include "remote-utils.h"
41 static void dump_mem PARAMS ((char *buf, int len));
43 static void init_callbacks PARAMS ((void));
45 static void end_callbacks PARAMS ((void));
47 static int gdb_os_write_stdout PARAMS ((host_callback *, const char *, int));
49 static void gdb_os_printf_filtered PARAMS ((host_callback *, const char *, ...));
51 static void gdb_os_error PARAMS ((host_callback *, const char *, ...));
53 static void gdbsim_fetch_register PARAMS ((int regno));
55 static void gdbsim_store_register PARAMS ((int regno));
57 static void gdbsim_kill PARAMS ((void));
59 static void gdbsim_load PARAMS ((char *prog, int fromtty));
61 static void gdbsim_create_inferior PARAMS ((char *exec_file, char *args, char **env));
63 static void gdbsim_open PARAMS ((char *args, int from_tty));
65 static void gdbsim_close PARAMS ((int quitting));
67 static void gdbsim_detach PARAMS ((char *args, int from_tty));
69 static void gdbsim_resume PARAMS ((int pid, int step, enum target_signal siggnal));
71 static int gdbsim_wait PARAMS ((int pid, struct target_waitstatus *status));
73 static void gdbsim_prepare_to_store PARAMS ((void));
75 static int gdbsim_xfer_inferior_memory PARAMS ((CORE_ADDR memaddr,
76 char *myaddr, int len,
78 struct target_ops *target));
80 static void gdbsim_files_info PARAMS ((struct target_ops *target));
82 static void gdbsim_mourn_inferior PARAMS ((void));
84 static void simulator_command PARAMS ((char *args, int from_tty));
88 sim_* are the interface to the simulator (see remote-sim.h).
89 gdbsim_* are stuff which is internal to gdb. */
91 /* Forward data declarations */
92 extern struct target_ops gdbsim_ops;
94 static int program_loaded = 0;
96 /* We must keep track of whether the simulator has been opened or not because
97 GDB can call a target's close routine twice, but sim_close doesn't allow
99 static int gdbsim_open_p = 0;
108 if (len == 8 || len == 4)
111 memcpy (l, buf, len);
112 printf_filtered ("\t0x%x", l[0]);
113 printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]);
118 printf_filtered ("\t");
119 for (i = 0; i < len; i++)
120 printf_filtered ("0x%x ", buf[i]);
121 printf_filtered ("\n");
126 static host_callback gdb_callback;
127 static int callbacks_initialized = 0;
129 /* Initialize gdb_callback. */
134 if (! callbacks_initialized)
136 gdb_callback = default_callback;
137 gdb_callback.init (&gdb_callback);
138 gdb_callback.write_stdout = gdb_os_write_stdout;
139 gdb_callback.printf_filtered = gdb_os_printf_filtered;
140 /* ??? where'd error come from? */
141 /*gdb_callback.error = gdb_os_error;*/
142 gdb_callback.last_errno= gdb_os_error;
143 sim_set_callbacks (&gdb_callback);
144 callbacks_initialized = 1;
148 /* Release callbacks (free resources used by them). */
153 if (callbacks_initialized)
155 gdb_callback.shutdown (&gdb_callback);
156 callbacks_initialized = 0;
160 /* GDB version of os_write_stdout callback. */
163 gdb_os_write_stdout (p, buf, len)
171 for (i = 0; i < len; i++)
175 if (target_output_hook)
176 target_output_hook (b);
178 fputs_filtered (b, gdb_stdout);
183 /* GDB version of printf_filtered callback. */
187 #ifdef ANSI_PROTOTYPES
188 gdb_os_printf_filtered (host_callback *p, const char *format, ...)
190 gdb_os_printf_filtered (p, va_alist)
196 #ifdef ANSI_PROTOTYPES
197 va_start (args, format);
202 format = va_arg (args, char *);
205 vfprintf_filtered (gdb_stdout, format, args);
210 /* GDB version of error callback. */
214 #ifdef ANSI_PROTOTYPES
215 gdb_os_error (host_callback *p, const char *format, ...)
217 gdb_os_error (p, va_alist)
227 #ifdef ANSI_PROTOTYPES
228 va_start (args, format);
233 format = va_arg (args, char *);
237 vfprintf_filtered (gdb_stderr, format, args);
238 fprintf_filtered (gdb_stderr, "\n");
240 return_to_top_level (RETURN_ERROR);
245 gdbsim_fetch_register (regno)
250 for (regno = 0; regno < NUM_REGS; regno++)
251 gdbsim_fetch_register (regno);
255 char buf[MAX_REGISTER_RAW_SIZE];
257 sim_fetch_register (regno, buf);
258 supply_register (regno, buf);
261 printf_filtered ("gdbsim_fetch_register: %d", regno);
262 /* FIXME: We could print something more intelligible. */
263 dump_mem (buf, REGISTER_RAW_SIZE (regno));
270 gdbsim_store_register (regno)
275 for (regno = 0; regno < NUM_REGS; regno++)
276 gdbsim_store_register (regno);
280 /* FIXME: Until read_register() returns LONGEST, we have this. */
281 char tmp[MAX_REGISTER_RAW_SIZE];
282 read_register_gen (regno, tmp);
283 sim_store_register (regno, tmp);
286 printf_filtered ("gdbsim_store_register: %d", regno);
287 /* FIXME: We could print something more intelligible. */
288 dump_mem (tmp, REGISTER_RAW_SIZE (regno));
293 /* Kill the running program. This may involve closing any open files
294 and releasing other resources acquired by the simulated program. */
300 printf_filtered ("gdbsim_kill\n");
302 sim_kill (); /* close fd's, remove mappings */
306 /* Load an executable file into the target process. This is expected to
307 not only bring new code into the target process, but also to update
308 GDB's symbol tables to match. */
311 gdbsim_load (prog, fromtty)
316 printf_filtered ("gdbsim_load: prog \"%s\"\n", prog);
320 /* This must be done before calling gr_load_image. */
323 if (sim_load (prog, fromtty) != 0)
324 generic_load (prog, fromtty);
328 /* Start an inferior process and set inferior_pid to its pid.
329 EXEC_FILE is the file to run.
330 ARGS is a string containing the arguments to the program.
331 ENV is the environment vector to pass. Errors reported with error().
332 On VxWorks and various standalone systems, we ignore exec_file. */
333 /* This is called not only when we first attach, but also when the
334 user types "run" after having attached. */
337 gdbsim_create_inferior (exec_file, args, env)
343 char *arg_buf,**argv;
346 if (! program_loaded)
347 error ("No program loaded.");
350 printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n",
353 if (exec_file == 0 || exec_bfd == 0)
354 error ("No exec file specified.");
356 entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd);
359 remove_breakpoints ();
360 init_wait_for_inferior ();
362 len = strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10;
363 arg_buf = (char *) alloca (len);
365 strcat (arg_buf, exec_file);
366 strcat (arg_buf, " ");
367 strcat (arg_buf, args);
368 argv = buildargv (arg_buf);
369 make_cleanup (freeargv, (char *) argv);
370 sim_create_inferior (entry_pt, argv, env);
373 insert_breakpoints (); /* Needed to get correct instruction in cache */
374 proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0);
377 /* The open routine takes the rest of the parameters from the command,
378 and (if successful) pushes a new target onto the stack.
379 Targets should supply this routine, if only to provide an error message. */
380 /* Called when selecting the simulator. EG: (gdb) target sim name. */
383 gdbsim_open (args, from_tty)
388 printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)");
390 /* Remove current simulator if one exists. Only do this if the simulator
391 has been opened because sim_close requires it.
392 This is important because the call to push_target below will cause
393 sim_close to be called if the simulator is already open, but push_target
394 is called after sim_open! We can't move the call to push_target before
395 the call to sim_open because sim_open may invoke `error'. */
397 unpush_target (&gdbsim_ops);
404 push_target (&gdbsim_ops);
405 target_fetch_registers (-1);
406 printf_filtered ("Connected to the simulator.\n");
409 /* Does whatever cleanup is required for a target that we are no longer
410 going to be calling. Argument says whether we are quitting gdb and
411 should not get hung in case of errors, or whether we want a clean
412 termination even if it takes a while. This routine is automatically
413 always called just before a routine is popped off the target stack.
414 Closing file descriptors and freeing memory are typical things it should
416 /* Close out all files and local state before this target loses control. */
419 gdbsim_close (quitting)
423 printf_filtered ("gdbsim_close: quitting %d\n", quitting);
429 sim_close (quitting);
436 /* Takes a program previously attached to and detaches it.
437 The program may resume execution (some targets do, some don't) and will
438 no longer stop on signals, etc. We better not have left any breakpoints
439 in the program or it'll die when it hits one. ARGS is arguments
440 typed by the user (e.g. a signal to send the process). FROM_TTY
441 says whether to be verbose or not. */
442 /* Terminate the open connection to the remote debugger.
443 Use this when you want to detach and do something else with your gdb. */
446 gdbsim_detach (args,from_tty)
451 printf_filtered ("gdbsim_detach: args \"%s\"\n", args);
453 pop_target (); /* calls gdbsim_close to do the real work */
455 printf_filtered ("Ending simulator %s debugging\n", target_shortname);
458 /* Resume execution of the target process. STEP says whether to single-step
459 or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given
460 to the target, or zero for no signal. */
463 gdbsim_resume (pid, step, siggnal)
465 enum target_signal siggnal;
467 if (inferior_pid != 42)
468 error ("The program is not being run.");
471 printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal);
473 sim_resume (step, target_signal_to_host (siggnal));
476 /* Wait for inferior process to do something. Return pid of child,
477 or -1 in case of error; store status through argument pointer STATUS,
478 just as `wait' would. */
481 gdbsim_wait (pid, status)
483 struct target_waitstatus *status;
486 enum sim_stop reason;
489 printf_filtered ("gdbsim_wait\n");
491 sim_stop_reason (&reason, &sigrc);
495 status->kind = TARGET_WAITKIND_EXITED;
496 status->value.integer = sigrc;
499 status->kind = TARGET_WAITKIND_STOPPED;
500 /* The signal in sigrc is a host signal. That probably
502 status->value.sig = target_signal_from_host (sigrc);
505 status->kind = TARGET_WAITKIND_SIGNALLED;
506 /* The signal in sigrc is a host signal. That probably
508 status->value.sig = target_signal_from_host (sigrc);
515 /* Get ready to modify the registers array. On machines which store
516 individual registers, this doesn't need to do anything. On machines
517 which store all the registers in one fell swoop, this makes sure
518 that registers contains all the registers from the program being
522 gdbsim_prepare_to_store ()
524 /* Do nothing, since we can store individual regs */
528 gdbsim_xfer_inferior_memory (memaddr, myaddr, len, write, target)
533 struct target_ops *target; /* ignored */
535 if (! program_loaded)
536 error ("No program loaded.");
540 printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n",
541 myaddr, memaddr, len, write);
542 if (sr_get_debug () && write)
543 dump_mem(myaddr, len);
548 len = sim_write (memaddr, myaddr, len);
552 len = sim_read (memaddr, myaddr, len);
553 if (sr_get_debug () && len > 0)
554 dump_mem(myaddr, len);
560 gdbsim_files_info (target)
561 struct target_ops *target;
563 char *file = "nothing";
566 file = bfd_get_filename (exec_bfd);
569 printf_filtered ("gdbsim_files_info: file \"%s\"\n", file);
573 printf_filtered ("\tAttached to %s running program %s\n",
574 target_shortname, file);
579 /* Clear the simulator's notion of what the break points are. */
582 gdbsim_mourn_inferior ()
585 printf_filtered ("gdbsim_mourn_inferior:\n");
587 remove_breakpoints ();
588 generic_mourn_inferior ();
591 /* Pass the command argument through to the simulator verbatim. The
592 simulator must do any command interpretation work. */
595 simulator_command (args, from_tty)
599 /* The user may give a command before the simulator is opened, so
600 ensure that the callbacks have been set up. */
603 sim_do_command (args);
606 /* Define the target subroutine names */
608 struct target_ops gdbsim_ops = {
609 "sim", /* to_shortname */
610 "simulator", /* to_longname */
611 "Use the compiled-in simulator.", /* to_doc */
612 gdbsim_open, /* to_open */
613 gdbsim_close, /* to_close */
614 NULL, /* to_attach */
615 gdbsim_detach, /* to_detach */
616 gdbsim_resume, /* to_resume */
617 gdbsim_wait, /* to_wait */
618 gdbsim_fetch_register, /* to_fetch_registers */
619 gdbsim_store_register, /* to_store_registers */
620 gdbsim_prepare_to_store, /* to_prepare_to_store */
621 gdbsim_xfer_inferior_memory, /* to_xfer_memory */
622 gdbsim_files_info, /* to_files_info */
623 memory_insert_breakpoint, /* to_insert_breakpoint */
624 memory_remove_breakpoint, /* to_remove_breakpoint */
625 NULL, /* to_terminal_init */
626 NULL, /* to_terminal_inferior */
627 NULL, /* to_terminal_ours_for_output */
628 NULL, /* to_terminal_ours */
629 NULL, /* to_terminal_info */
630 gdbsim_kill, /* to_kill */
631 gdbsim_load, /* to_load */
632 NULL, /* to_lookup_symbol */
633 gdbsim_create_inferior, /* to_create_inferior */
634 gdbsim_mourn_inferior, /* to_mourn_inferior */
636 0, /* to_notice_signals */
637 0, /* to_thread_alive */
639 process_stratum, /* to_stratum */
641 1, /* to_has_all_memory */
642 1, /* to_has_memory */
643 1, /* to_has_stack */
644 1, /* to_has_registers */
645 1, /* to_has_execution */
647 NULL, /* sections_end */
648 OPS_MAGIC, /* to_magic */
652 _initialize_remote_sim ()
654 add_target (&gdbsim_ops);
656 add_com ("sim <command>", class_obscure, simulator_command,
657 "Send a command to the simulator.");