[deliverable/binutils-gdb.git] / gdb / remote-sp64sim.c

/* Generic remote debugging interface for simulators.
   Copyright 1993 Free Software Foundation, Inc.
   Contributed by Cygnus Support.  Hacked from Steve Chamberlain's Z8000 work
   by Doug Evans. (dje@cygnus.com).

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "inferior.h"
#include "wait.h"
#include "value.h"
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <setjmp.h>
#include <errno.h>
#include "terminal.h"
#include "target.h"
#include "gdbcore.h"
#include "simif.h"

/* Naming conventions:

   sim_xxx are internal objects that describe top level interfaces to the
   simulator.

   simif_xxx are external counterparts to the sim_xxx objects that must be
   provided by the simulator (simif for SIMulator InterFace, duh...).

   A complete list of them is:

   --- Fetch one register and store the raw value in BUF.

int simif_fetch_register (int regno, char *buf);

   --- Store VAL in one register.

int simif_store_register (int regno, char *val);

   --- Complete terminate the simulator.  This includes freeing all memory,
   closing all open files, and releasing all mmap'd memory.

int simif_kill (void);

   --- Load program PROG into the simulator.

int simif_load (bfd *abfd, char *prog);

   --- Set the arguments and environment for the program loaded into the
   simulator.  ARGV and ENV are NULL terminated lists of pointers.

int simif_set_args (char **argv, char **env);

   --- Initialize the simulator.  This function is called when the simulator
   is selected from the command line. ARGS is passed from the command line
   and can be used to select whatever run time options the simulator provides.
   ARGS is the raw character string and must be parsed by the simulator.

int simif_open (char *args);

   --- Start running the program, or resume it after a breakpoint.
   FIXME: What are A and B?

int simif_resume (int a, int b);

   --- Fetch the reason why the program stopped running (breakpoint, signal,
   etc.)

WAITTYPE simif_stop_signal (void);

   --- Write some data into the program's memory.
   Result is 0 for success, nonzero for failure.

int simif_write (CORE_ADDR memaddr, char *myaddr, int len);

   --- Read some data from the program's memory.
   Result is 0 for success, nonzero for failure.

int simif_read (CORE_ADDR memaddr, char *myaddr, int len);
*/

/* Forward data declarations */
extern struct target_ops sim_ops;

int sim_verbose = 0;	/* available to the simulator to use */

static int program_loaded = 0;

static void dump_mem ();

static void
sim_fetch_register (regno)
int regno;
{
  if (regno == -1) 
    {
      if (sim_verbose)
	printf_filtered ("sim_fetch_register: %d\n", regno);
      /* FIXME: Where did the 16 come from and what does it need to be? */
      for (regno = 0; regno < 16; regno++)
	sim_fetch_register (regno);
    }
  else
    {
      char buf[MAX_REGISTER_RAW_SIZE];

      simif_fetch_register (regno, buf);
      supply_register (regno, buf);
      if (sim_verbose)
	{
	  printf_filtered ("sim_fetch_register: %d", regno);
	  dump_mem (buf, sizeof (REGISTER_TYPE));
	}
    }
}

static void
sim_store_register (regno)
int regno;
{
  if (regno  == -1) 
    {
      if (sim_verbose)
	printf_filtered ("sim_store_register: %d\n", regno);
      /* FIXME: 16? */
      for (regno = 0; regno < 16; regno++)
	sim_store_register (regno);
    }
  else
    {
      char value[sizeof (REGISTER_TYPE)];

      read_register_gen (regno, value);
      SWAP_TARGET_AND_HOST (value, sizeof (REGISTER_TYPE));
      simif_store_register (regno, value);
      if (sim_verbose)
	{
	  printf_filtered ("sim_store_register: %d", regno);
	  dump_mem (value, sizeof (REGISTER_TYPE));
	}
    }
}

static void
sim_kill (arg,from_tty)
char	*arg;
int	from_tty;
{
  if (sim_verbose)
    printf_filtered ("sim_kill: arg \"%s\"\n", arg);

  simif_kill ();	/* close fd's, remove mappings */
  inferior_pid = 0;
}

/* Load program PROG into the sim. */

static void
sim_load (prog, fromtty)
     char *prog;
     int fromtty;
{
  bfd	*abfd;

  if (sim_verbose)
    printf_filtered ("sim_load: prog \"%s\"\n", prog);

  inferior_pid = 0;  
  program_loaded = 0;
  abfd = bfd_openr (prog, (char *) 0);

  if (!abfd) 
    error ("Unable to open file %s.", prog);

  if (bfd_check_format (abfd, bfd_object) ==0) 
    error ("File is not an object file.");

  if (simif_load (abfd, prog) != 0)
    return;

  program_loaded = 1;

  simif_set_pc (abfd->start_address);
}

/* This is called not only when we first attach, but also when the
   user types "run" after having attached.  */

static void
sim_create_inferior (exec_file, args, env)
     char *exec_file;
     char *args;
     char **env;
{
  int len,entry_pt;
  char *arg_buf,**argv;

  if (! program_loaded)
    error ("No program loaded.");

  if (sim_verbose)
    printf_filtered ("sim_create_inferior: exec_file \"%s\", args \"%s\"\n",
      exec_file, args);

  if (exec_file == 0 || exec_bfd == 0)
   error ("No exec file specified.");

  entry_pt = (int) bfd_get_start_address (exec_bfd);

  sim_kill (NULL, NULL);	 
  remove_breakpoints ();
  init_wait_for_inferior ();

  len = 5 + strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10;
  arg_buf = (char *) alloca (len);
  arg_buf[0] = '\0';
  strcat (arg_buf, exec_file);
  strcat (arg_buf, " ");
  strcat (arg_buf, args);
  argv = buildargv (arg_buf);
  make_cleanup (freeargv, (char *) argv);
  simif_set_args (argv, env);

  inferior_pid = 42;
  insert_breakpoints ();	/* Needed to get correct instruction in cache */
  proceed (entry_pt, -1, 0);
}

/* Called when selecting the simulator. EG: (gdb) target sim name.  */

static void
sim_open (args, from_tty)
     char *args;
     int from_tty;
{
  if (sim_verbose)
    printf_filtered ("sim_open: args \"%s\"\n", args);

  if (simif_open (args) != 0)
    {
      error ("Unable to initialize simulator (insufficient memory?).");
      return;
    }

  push_target (&sim_ops);
  target_fetch_registers (-1);

  printf_filtered ("Connected to the simulator.\n");
}

/* Close out all files and local state before this target loses control. */

static void
sim_close (quitting)
     int quitting;
{
  if (sim_verbose)
    printf_filtered ("sim_close: quitting %d\n", quitting);

  program_loaded = 0;

  /* FIXME: Need to call simif_close() to close all files and
     delete all mappings. */
}

/* Terminate the open connection to the remote debugger.
   Use this when you want to detach and do something else
   with your gdb.  */

static void
sim_detach (args,from_tty)
     char *args;
     int from_tty;
{
  if (sim_verbose)
    printf_filtered ("sim_detach: args \"%s\"\n", args);

  pop_target ();		/* calls sim_close to do the real work */
  if (from_tty)
    printf_filtered ("Ending simulator %s debugging\n", target_shortname);
}
 
/* Tell the remote machine to resume.  */
/* FIXME: What are A and B?  */

static void
sim_resume (a,b)
{
  if (sim_verbose)
    printf_filtered ("sim_resume: %d/%d\n", a, b);

  simif_resume (a, b);
}

/* Wait until the remote machine stops, then return,
   storing status in STATUS just as `wait' would.  */

static int
sim_wait (status)
     WAITTYPE *status;
{
  if (sim_verbose)
    printf_filtered ("sim_wait: ");
#if 1
  *status = simif_stop_signal ();
#else
  WSETSTOP (*status, simif_stop_signal ());
#endif
  if (sim_verbose)
    printf_filtered ("status %d\n", *status);
  return 0;
}

/* Get ready to modify the registers array.  On machines which store
   individual registers, this doesn't need to do anything.  On machines
   which store all the registers in one fell swoop, this makes sure
   that registers contains all the registers from the program being
   debugged.  */

static void
sim_prepare_to_store ()
{
  /* Do nothing, since we can store individual regs */
}

static int
sim_xfer_inferior_memory (memaddr, myaddr, len, write, target)
     CORE_ADDR memaddr;
     char *myaddr;
     int len;
     int write;
     struct target_ops *target;			/* ignored */
{
  if (sim_verbose)
    {
      printf_filtered ("sim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n",
		       myaddr, memaddr, len, write);
      if (sim_verbose && write)
	dump_mem(myaddr, len);
    }

  if (! program_loaded)
    error ("No program loaded.");

  if (write)
    {
      len = simif_write (memaddr, myaddr, len);
    }
  else 
    {
      len = simif_read (memaddr, myaddr, len);
      if (sim_verbose && len  > 0)
	dump_mem(myaddr, len);
    } 
  return len;
}

static void
sim_files_info ()
{
  char *file = "nothing";

  if (exec_bfd)
    file = bfd_get_filename (exec_bfd);

  if (sim_verbose)
    printf_filtered ("sim_files_info: file \"%s\"\n", file);

  if (exec_bfd)
    printf_filtered ("\tAttached to %s running program %s\n",
      target_shortname, file);
}

/* Clear the sims notion of what the break points are */
static void
sim_mourn () 
{ 
  if (sim_verbose)
    printf_filtered ("sim_mourn:\n");

  remove_breakpoints ();
  generic_mourn_inferior ();
}

/* Define the target subroutine names */

struct target_ops sim_ops = 
{
  "sim", "Simulator",
  "Use the Simulator",
  sim_open, sim_close, 
  0, sim_detach, sim_resume, sim_wait, /* attach */
  sim_fetch_register, sim_store_register,
  sim_prepare_to_store,
  sim_xfer_inferior_memory, 
  sim_files_info,
  0, 0,				/* Breakpoints */
  0, 0, 0, 0, 0,		/* Terminal handling */
  sim_kill,			/* FIXME, kill */
  sim_load, 
  0,				/* lookup_symbol */
  sim_create_inferior,	/* create_inferior */ 
  sim_mourn,			/* mourn_inferior FIXME */
  0,				/* can_run */
  0,				/* notice_signals */
  process_stratum, 0,		/* next */
  1, 1, 1, 1, 1,		/* all mem, mem, stack, regs, exec */
  0, 0,				/* Section pointers */
  OPS_MAGIC,			/* Always the last thing */
};

static void
sim_snoop ()
{
  sim_verbose = ! sim_verbose;  
  if (sim_verbose)
    printf_filtered ("Snoop enabled\n");
  else
    printf_filtered ("Snoop disabled\n");

}

/***********************************************************************/

void
_initialize_remote_sim ()
{
  add_target (&sim_ops);
  add_com ("snoop", class_obscure, sim_snoop,
	   "Show what commands are going to the simulator");
}

static void
dump_mem (buf, len)
     char *buf;
     int len;
{
  if (len <= 8)
    {
      if (len == 8 || len == 4)
	{
	  long l[2];
	  memcpy (l, buf, len);
	  printf_filtered ("\t0x%x", l[0]);
	  printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]);
	}
      else
	{
	  int i;
	  printf_filtered ("\t");
	  for (i = 0; i < len; i++)
	    printf_filtered ("0x%x ", buf[i]);
	  printf_filtered ("\n");
	}
    }
}
Commit	Line	Data
595dc9a4 DE	1	/* Generic remote debugging interface for simulators.
595dc9a4 DE	2	Copyright 1993 Free Software Foundation, Inc.
cb747ec5 DE	3	Contributed by Cygnus Support. Hacked from Steve Chamberlain's Z8000 work
	4	by Doug Evans. (dje@cygnus.com).
	5
	6	This file is part of GDB.
	7
	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.
	12
	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.
	17
	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., 675 Mass Ave, Cambridge, MA 02139, USA. */
	21
	22	#include "defs.h"
	23	#include "inferior.h"
	24	#include "wait.h"
	25	#include "value.h"
	26	#include <string.h>
	27	#include <ctype.h>
	28	#include <fcntl.h>
	29	#include <signal.h>
	30	#include <setjmp.h>
	31	#include <errno.h>
	32	#include "terminal.h"
	33	#include "target.h"
	34	#include "gdbcore.h"
595dc9a4	35	#include "simif.h"
cb747ec5 DE	36
	37	/* Naming conventions:
	38
595dc9a4 DE	39	sim_xxx are internal objects that describe top level interfaces to the
595dc9a4 DE	40	simulator.
cb747ec5	41
595dc9a4 DE	42	simif_xxx are external counterparts to the sim_xxx objects that must be
	43	provided by the simulator (simif for SIMulator InterFace, duh...).
	44
	45	A complete list of them is:
	46
	47	--- Fetch one register and store the raw value in BUF.
	48
	49	int simif_fetch_register (int regno, char *buf);
	50
	51	--- Store VAL in one register.
	52
	53	int simif_store_register (int regno, char *val);
	54
	55	--- Complete terminate the simulator. This includes freeing all memory,
	56	closing all open files, and releasing all mmap'd memory.
	57
	58	int simif_kill (void);
	59
	60	--- Load program PROG into the simulator.
	61
	62	int simif_load (bfd abfd, char prog);
	63
	64	--- Set the arguments and environment for the program loaded into the
	65	simulator. ARGV and ENV are NULL terminated lists of pointers.
	66
	67	int simif_set_args (char argv, char env);
	68
	69	--- Initialize the simulator. This function is called when the simulator
	70	is selected from the command line. ARGS is passed from the command line
	71	and can be used to select whatever run time options the simulator provides.
	72	ARGS is the raw character string and must be parsed by the simulator.
	73
	74	int simif_open (char *args);
	75
	76	--- Start running the program, or resume it after a breakpoint.
	77	FIXME: What are A and B?
	78
	79	int simif_resume (int a, int b);
	80
	81	--- Fetch the reason why the program stopped running (breakpoint, signal,
	82	etc.)
	83
	84	WAITTYPE simif_stop_signal (void);
	85
	86	--- Write some data into the program's memory.
	87	Result is 0 for success, nonzero for failure.
	88
	89	int simif_write (CORE_ADDR memaddr, char *myaddr, int len);
	90
	91	--- Read some data from the program's memory.
	92	Result is 0 for success, nonzero for failure.
	93
	94	int simif_read (CORE_ADDR memaddr, char *myaddr, int len);
	95	*/
cb747ec5 DE	96
cb747ec5 DE	97	/* Forward data declarations */
595dc9a4	98	extern struct target_ops sim_ops;
cb747ec5	99
595dc9a4	100	int sim_verbose = 0; /* available to the simulator to use */
cb747ec5 DE	101
	102	static int program_loaded = 0;
	103
	104	static void dump_mem ();
	105
	106	static void
595dc9a4	107	sim_fetch_register (regno)
cb747ec5 DE	108	int regno;
	109	{
	110	if (regno == -1)
	111	{
595dc9a4 DE	112	if (sim_verbose)
	113	printf_filtered ("sim_fetch_register: %d\n", regno);
	114	/* FIXME: Where did the 16 come from and what does it need to be? */
cb747ec5	115	for (regno = 0; regno < 16; regno++)
595dc9a4	116	sim_fetch_register (regno);
cb747ec5 DE	117	}
	118	else
	119	{
	120	char buf[MAX_REGISTER_RAW_SIZE];
	121
595dc9a4	122	simif_fetch_register (regno, buf);
cb747ec5	123	supply_register (regno, buf);
595dc9a4	124	if (sim_verbose)
cb747ec5	125	{
595dc9a4	126	printf_filtered ("sim_fetch_register: %d", regno);
cb747ec5 DE	127	dump_mem (buf, sizeof (REGISTER_TYPE));
	128	}
	129	}
	130	}
	131
	132	static void
595dc9a4	133	sim_store_register (regno)
cb747ec5 DE	134	int regno;
	135	{
	136	if (regno == -1)
	137	{
595dc9a4 DE	138	if (sim_verbose)
	139	printf_filtered ("sim_store_register: %d\n", regno);
	140	/* FIXME: 16? */
cb747ec5	141	for (regno = 0; regno < 16; regno++)
595dc9a4	142	sim_store_register (regno);
cb747ec5	143	}
595dc9a4	144	else
cb747ec5 DE	145	{
	146	char value[sizeof (REGISTER_TYPE)];
	147
	148	read_register_gen (regno, value);
	149	SWAP_TARGET_AND_HOST (value, sizeof (REGISTER_TYPE));
595dc9a4 DE	150	simif_store_register (regno, value);
595dc9a4 DE	151	if (sim_verbose)
cb747ec5	152	{
595dc9a4	153	printf_filtered ("sim_store_register: %d", regno);
cb747ec5 DE	154	dump_mem (value, sizeof (REGISTER_TYPE));
	155	}
	156	}
	157	}
	158
	159	static void
595dc9a4	160	sim_kill (arg,from_tty)
cb747ec5 DE	161	char *arg;
	162	int from_tty;
	163	{
595dc9a4 DE	164	if (sim_verbose)
595dc9a4 DE	165	printf_filtered ("sim_kill: arg \"%s\"\n", arg);
cb747ec5	166
595dc9a4	167	simif_kill (); /* close fd's, remove mappings */
cb747ec5 DE	168	inferior_pid = 0;
	169	}
	170
595dc9a4	171	/* Load program PROG into the sim. */
cb747ec5 DE	172
cb747ec5 DE	173	static void
595dc9a4 DE	174	sim_load (prog, fromtty)
595dc9a4 DE	175	char *prog;
cb747ec5 DE	176	int fromtty;
	177	{
	178	bfd *abfd;
	179
595dc9a4 DE	180	if (sim_verbose)
595dc9a4 DE	181	printf_filtered ("sim_load: prog \"%s\"\n", prog);
cb747ec5 DE	182
	183	inferior_pid = 0;
	184	program_loaded = 0;
595dc9a4	185	abfd = bfd_openr (prog, (char *) 0);
cb747ec5 DE	186
cb747ec5 DE	187	if (!abfd)
595dc9a4	188	error ("Unable to open file %s.", prog);
cb747ec5 DE	189
	190	if (bfd_check_format (abfd, bfd_object) ==0)
	191	error ("File is not an object file.");
	192
595dc9a4	193	if (simif_load (abfd, prog) != 0)
cb747ec5 DE	194	return;
	195
	196	program_loaded = 1;
	197
595dc9a4	198	simif_set_pc (abfd->start_address);
cb747ec5 DE	199	}
	200
	201	/* This is called not only when we first attach, but also when the
	202	user types "run" after having attached. */
	203
	204	static void
595dc9a4	205	sim_create_inferior (exec_file, args, env)
cb747ec5 DE	206	char *exec_file;
	207	char *args;
	208	char **env;
	209	{
	210	int len,entry_pt;
	211	char arg_buf,*argv;
	212
	213	if (! program_loaded)
	214	error ("No program loaded.");
	215
595dc9a4 DE	216	if (sim_verbose)
595dc9a4 DE	217	printf_filtered ("sim_create_inferior: exec_file \"%s\", args \"%s\"\n",
cb747ec5 DE	218	exec_file, args);
	219
	220	if (exec_file == 0 \|\| exec_bfd == 0)
	221	error ("No exec file specified.");
	222
	223	entry_pt = (int) bfd_get_start_address (exec_bfd);
	224
595dc9a4	225	sim_kill (NULL, NULL);
cb747ec5 DE	226	remove_breakpoints ();
	227	init_wait_for_inferior ();
	228
	229	len = 5 + strlen (exec_file) + 1 + strlen (args) + 1 + /slop/ 10;
	230	arg_buf = (char *) alloca (len);
	231	arg_buf[0] = '\0';
	232	strcat (arg_buf, exec_file);
	233	strcat (arg_buf, " ");
	234	strcat (arg_buf, args);
	235	argv = buildargv (arg_buf);
	236	make_cleanup (freeargv, (char *) argv);
595dc9a4	237	simif_set_args (argv, env);
cb747ec5 DE	238
	239	inferior_pid = 42;
	240	insert_breakpoints (); /* Needed to get correct instruction in cache */
	241	proceed (entry_pt, -1, 0);
	242	}
	243
595dc9a4	244	/* Called when selecting the simulator. EG: (gdb) target sim name. */
cb747ec5 DE	245
cb747ec5 DE	246	static void
595dc9a4 DE	247	sim_open (args, from_tty)
595dc9a4 DE	248	char *args;
cb747ec5 DE	249	int from_tty;
cb747ec5 DE	250	{
595dc9a4 DE	251	if (sim_verbose)
595dc9a4 DE	252	printf_filtered ("sim_open: args \"%s\"\n", args);
cb747ec5	253
595dc9a4	254	if (simif_open (args) != 0)
cb747ec5 DE	255	{
	256	error ("Unable to initialize simulator (insufficient memory?).");
	257	return;
	258	}
	259
595dc9a4	260	push_target (&sim_ops);
cb747ec5 DE	261	target_fetch_registers (-1);
	262
	263	printf_filtered ("Connected to the simulator.\n");
	264	}
	265
	266	/* Close out all files and local state before this target loses control. */
	267
	268	static void
595dc9a4	269	sim_close (quitting)
cb747ec5 DE	270	int quitting;
cb747ec5 DE	271	{
595dc9a4 DE	272	if (sim_verbose)
595dc9a4 DE	273	printf_filtered ("sim_close: quitting %d\n", quitting);
cb747ec5 DE	274
	275	program_loaded = 0;
	276
595dc9a4	277	/* FIXME: Need to call simif_close() to close all files and
cb747ec5 DE	278	delete all mappings. */
	279	}
	280
	281	/* Terminate the open connection to the remote debugger.
	282	Use this when you want to detach and do something else
	283	with your gdb. */
	284
	285	static void
595dc9a4	286	sim_detach (args,from_tty)
cb747ec5 DE	287	char *args;
	288	int from_tty;
	289	{
595dc9a4 DE	290	if (sim_verbose)
595dc9a4 DE	291	printf_filtered ("sim_detach: args \"%s\"\n", args);
cb747ec5	292
595dc9a4	293	pop_target (); /* calls sim_close to do the real work */
cb747ec5 DE	294	if (from_tty)
	295	printf_filtered ("Ending simulator %s debugging\n", target_shortname);
	296	}
	297
	298	/* Tell the remote machine to resume. */
	299	/* FIXME: What are A and B? */
	300
	301	static void
595dc9a4	302	sim_resume (a,b)
cb747ec5	303	{
595dc9a4 DE	304	if (sim_verbose)
595dc9a4 DE	305	printf_filtered ("sim_resume: %d/%d\n", a, b);
cb747ec5	306
595dc9a4	307	simif_resume (a, b);
cb747ec5 DE	308	}
	309
	310	/* Wait until the remote machine stops, then return,
	311	storing status in STATUS just as `wait' would. */
	312
	313	static int
595dc9a4	314	sim_wait (status)
cb747ec5 DE	315	WAITTYPE *status;
cb747ec5 DE	316	{
595dc9a4 DE	317	if (sim_verbose)
595dc9a4 DE	318	printf_filtered ("sim_wait: ");
cb747ec5	319	#if 1
595dc9a4	320	*status = simif_stop_signal ();
cb747ec5	321	#else
595dc9a4	322	WSETSTOP (*status, simif_stop_signal ());
cb747ec5	323	#endif
595dc9a4	324	if (sim_verbose)
cb747ec5 DE	325	printf_filtered ("status %d\n", *status);
	326	return 0;
	327	}
	328
	329	/* Get ready to modify the registers array. On machines which store
	330	individual registers, this doesn't need to do anything. On machines
	331	which store all the registers in one fell swoop, this makes sure
	332	that registers contains all the registers from the program being
	333	debugged. */
	334
	335	static void
595dc9a4	336	sim_prepare_to_store ()
cb747ec5 DE	337	{
	338	/* Do nothing, since we can store individual regs */
	339	}
	340
	341	static int
595dc9a4	342	sim_xfer_inferior_memory (memaddr, myaddr, len, write, target)
cb747ec5 DE	343	CORE_ADDR memaddr;
	344	char *myaddr;
	345	int len;
	346	int write;
	347	struct target_ops target; / ignored */
	348	{
595dc9a4 DE	349	if (sim_verbose)
	350	{
	351	printf_filtered ("sim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n",
	352	myaddr, memaddr, len, write);
	353	if (sim_verbose && write)
	354	dump_mem(myaddr, len);
	355	}
cb747ec5 DE	356
	357	if (! program_loaded)
	358	error ("No program loaded.");
	359
	360	if (write)
595dc9a4 DE	361	{
	362	len = simif_write (memaddr, myaddr, len);
	363	}
cb747ec5	364	else
595dc9a4 DE	365	{
	366	len = simif_read (memaddr, myaddr, len);
	367	if (sim_verbose && len > 0)
	368	dump_mem(myaddr, len);
	369	}
cb747ec5 DE	370	return len;
	371	}
	372
	373	static void
595dc9a4	374	sim_files_info ()
cb747ec5 DE	375	{
	376	char *file = "nothing";
	377
	378	if (exec_bfd)
	379	file = bfd_get_filename (exec_bfd);
	380
595dc9a4 DE	381	if (sim_verbose)
595dc9a4 DE	382	printf_filtered ("sim_files_info: file \"%s\"\n", file);
cb747ec5 DE	383
	384	if (exec_bfd)
	385	printf_filtered ("\tAttached to %s running program %s\n",
	386	target_shortname, file);
	387	}
	388
	389	/* Clear the sims notion of what the break points are */
	390	static void
595dc9a4	391	sim_mourn ()
cb747ec5	392	{
595dc9a4 DE	393	if (sim_verbose)
595dc9a4 DE	394	printf_filtered ("sim_mourn:\n");
cb747ec5 DE	395
	396	remove_breakpoints ();
	397	generic_mourn_inferior ();
	398	}
	399
	400	/* Define the target subroutine names */
	401
595dc9a4	402	struct target_ops sim_ops =
cb747ec5	403	{
595dc9a4 DE	404	"sim", "Simulator",
	405	"Use the Simulator",
	406	sim_open, sim_close,
	407	0, sim_detach, sim_resume, sim_wait, /* attach */
	408	sim_fetch_register, sim_store_register,
	409	sim_prepare_to_store,
	410	sim_xfer_inferior_memory,
	411	sim_files_info,
cb747ec5 DE	412	0, 0, /* Breakpoints */
cb747ec5 DE	413	0, 0, 0, 0, 0, /* Terminal handling */
595dc9a4 DE	414	sim_kill, /* FIXME, kill */
595dc9a4 DE	415	sim_load,
cb747ec5	416	0, /* lookup_symbol */
595dc9a4 DE	417	sim_create_inferior, /* create_inferior */
595dc9a4 DE	418	sim_mourn, /* mourn_inferior FIXME */
cb747ec5 DE	419	0, /* can_run */
	420	0, /* notice_signals */
	421	process_stratum, 0, /* next */
	422	1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
	423	0, 0, /* Section pointers */
	424	OPS_MAGIC, /* Always the last thing */
	425	};
	426
	427	static void
595dc9a4	428	sim_snoop ()
cb747ec5	429	{
595dc9a4 DE	430	sim_verbose = ! sim_verbose;
595dc9a4 DE	431	if (sim_verbose)
cb747ec5 DE	432	printf_filtered ("Snoop enabled\n");
	433	else
	434	printf_filtered ("Snoop disabled\n");
	435
	436	}
	437
	438	/***********************************************************************/
	439
	440	void
	441	_initialize_remote_sim ()
	442	{
595dc9a4 DE	443	add_target (&sim_ops);
595dc9a4 DE	444	add_com ("snoop", class_obscure, sim_snoop,
cb747ec5 DE	445	"Show what commands are going to the simulator");
	446	}
	447
	448	static void
	449	dump_mem (buf, len)
	450	char *buf;
	451	int len;
	452	{
	453	if (len <= 8)
cb747ec5	454	{
595dc9a4 DE	455	if (len == 8 \|\| len == 4)
	456	{
	457	long l[2];
	458	memcpy (l, buf, len);
	459	printf_filtered ("\t0x%x", l[0]);
	460	printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]);
	461	}
	462	else
	463	{
	464	int i;
	465	printf_filtered ("\t");
	466	for (i = 0; i < len; i++)
	467	printf_filtered ("0x%x ", buf[i]);
	468	printf_filtered ("\n");
	469	}
cb747ec5	470	}
cb747ec5	471	}