[binutils.git] / gdb / magic.c

#include "defs.h"
#include "gdbcmd.h"
#include "symtab.h"
#include "value.h"
#include <ctype.h>
#include <string.h>
#ifdef DYNAMIC_COMMAND_SUPPORT
#include <dlfcn.h>
#endif

typedef unsigned long ulong;

#ifdef DYNAMIC_COMMAND_SUPPORT
static void
dlopen_command PARAMS ((char *, int));
#endif

#ifdef DYNAMIC_COMMAND_SUPPORT
/* ARGSUSED */
static void
dlopen_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	char *p;
	void *hdl;
	void (*sym)();

	if (arg == 0) {
		error ("No arguments specified.");
		return;
	}
	p = arg;
	while(*p != ' ' && *p != '\0')
		p++;
	if (*p != ' ') {
		error ("Not enough arguments.");
		return;
	}
    *p++ = '\0';

	hdl = dlopen(arg, RTLD_NOW);
	if (hdl == NULL) {
		fprintf(stderr, "%s: %s\n", arg, dlerror());
		return;
	}
	sym = dlsym(hdl, p);

	if (sym == NULL) {
		fprintf(stderr, "%s: %s\n", p, dlerror());
		return;
	}

	sym();
}
#endif

static void
local_shell_escape (char *arg)
{
#ifdef CANT_FORK
  /* FIXME: what about errors (I don't know how GO32 system() handles
     them)?  */
  system (arg);
#else /* Can fork.  */
  int rc, status, pid;
  char *p, *user_shell;

  if ((user_shell = (char *) getenv ("SHELL")) == NULL)
    user_shell = "/bin/sh";

  /* Get the name of the shell for arg0 */
  if ((p = strrchr (user_shell, '/')) == NULL)
    p = user_shell;
  else
    p++;			/* Get past '/' */

  if ((pid = fork()) == 0)
    {
      if (!arg)
	execl (user_shell, p, 0);
      else
	execl (user_shell, p, "-c", arg, 0);

      fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell,
			  safe_strerror (errno));
      gdb_flush (gdb_stderr);
      _exit (0177);
    }

  if (pid != -1)
    while ((rc = wait (&status)) != pid && rc != -1)
      ;
  else
    error ("Fork failed");
#endif /* Can fork.  */
}

static void
GetClassName(long objectID, char* name)
{
  register value_ptr val;
  register struct symbol *sym;
  struct minimal_symbol *msymbol;
  struct type *type;
  value_ptr blocklen;
  LONGEST maddr;

  /* Find the address of RemoteGetClassName in the inferior.  */

  sym = lookup_symbol ("RemoteGetClassName", 0, VAR_NAMESPACE, 0, NULL);
  if (sym != NULL)
    {
      if (SYMBOL_CLASS (sym) != LOC_BLOCK)
	{
	  error ("\"RemoteGetClassName\" exists in this program but is not a function.");
	}
      val = value_of_variable (sym, NULL);
    }
  else
    {
      msymbol = lookup_minimal_symbol ("RemoteGetClassName", "", (struct objfile *) NULL);
      if (msymbol != NULL)
	{
	  type = lookup_pointer_type (builtin_type_char);
	  type = lookup_function_type (type);
	  type = lookup_pointer_type (type);
	  maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol);
	  val = value_from_longest (type, maddr);
	}
      else
	{
	  error ("evaluation of this expression requires the program to have a function \"RemoteGetClassName\".");
	}
    }

  blocklen = value_from_longest (builtin_type_int, (LONGEST) objectID);
  val = call_function_by_hand (val, 1, &blocklen);
  if (value_logical_not (val))
    {
      error ("Could not get class name.");
    }
	read_memory(value_as_pointer(val), name, 32);
	
}

static CORE_ADDR
GetBasePtr(long objectID)
{
  register value_ptr val;
  register struct symbol *sym;
  struct minimal_symbol *msymbol;
  struct type *type;
  value_ptr blocklen;
  LONGEST maddr;

  /* Find the address of RemoteGetBasePtr in the inferior.  */

  sym = lookup_symbol ("RemoteGetBasePtr", 0, VAR_NAMESPACE, 0, NULL);
  if (sym != NULL)
    {
      if (SYMBOL_CLASS (sym) != LOC_BLOCK)
	{
	  error ("\"RemoteGetBasePtr\" exists in this program but is not a function.");
	}
      val = value_of_variable (sym, NULL);
    }
  else
    {
      msymbol = lookup_minimal_symbol ("RemoteGetBasePtr", "",  (struct objfile *) NULL);
      if (msymbol != NULL)
	{
	  type = lookup_pointer_type (builtin_type_char);
	  type = lookup_function_type (type);
	  type = lookup_pointer_type (type);
	  maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol);
	  val = value_from_longest (type, maddr);
	}
      else
	{
	  error ("evaluation of this expression requires the program to have a function \"RemoteGetBasePtr\".");
	}
    }

  blocklen = value_from_longest (builtin_type_int, (LONGEST) objectID);
  val = call_function_by_hand (val, 1, &blocklen);
  if (value_logical_not (val))
    {
      error ("Could not get base pointer to object.");
    }
	return value_as_pointer(val);
}

static void
dump_extra_data(CORE_ADDR addr, ulong length)
{
	ulong buf[5], chunk, i;
	char *p;

	while (length > 3) {
		chunk = (length > 16) ? 16 : length;

		memset(buf, 0, 5*sizeof(long));
		read_memory(addr, &buf, chunk);
		fprintf(gdb_stdout, "%08lx %08lx %08lx %08lx | ", buf[0], 
			buf[1], buf[2], buf[3]);
		for (i = 0, p = (char*)buf; i < chunk; i++, p++) {
			if (!isprint(*p))
				*p = '.';
		}
		fprintf(gdb_stdout, "%s |\n", buf);
		addr += chunk;
		length -= chunk;
	}
}

struct type *type_of_object(CORE_ADDR object)
{
	char className[32], classAllFieldsName[128];
	struct type *type = NULL;
	GetClassName(object, className);
	sprintf(classAllFieldsName, "%s_AllFields", className);

	type = lookup_typename(classAllFieldsName, (struct block *)NULL, 0);
	return lookup_pointer_type(type);
}

CORE_ADDR baseptr_of_object(ulong object)
{
	return GetBasePtr(object) + 12;
}

/* ARGSUSED */
static void
print_object (arg, dump)
     char *arg;
	 int dump;
{
	CORE_ADDR addr;
	ulong object, objectLength, typeLength = 0;
	char className[32], classAllFieldsName[128];
	struct type* type = NULL;

	object = parse_and_eval_address(arg);

	GetClassName(object, className);
	sprintf(classAllFieldsName, "%s_AllFields", className);

	type = lookup_typename(classAllFieldsName, (struct block *)NULL, 0);
	typeLength = TYPE_LENGTH(type);
	addr = GetBasePtr(object);
	read_memory(addr, &objectLength, 4);
	objectLength -= 12;
	addr += 12;
	if (TYPE_CODE(type) != TYPE_CODE_UNDEF && !(TYPE_FLAGS(type)&TYPE_FLAG_STUB)) {
		if (dump) {
			value_ptr valptr = value_at_lazy(type, addr);
			int histindex = record_latest_value(valptr);
			printf_filtered("Object 0x%08lx at address 0x%08lx of class %s\n", 
					object, addr, className);
			if (histindex >= 0) printf_filtered ("$%d = ", histindex);
			value_print(valptr, gdb_stdout, 0, Val_prettyprint);
			objectLength -= typeLength;
			addr += typeLength;
			printf_filtered("\n");
			dump_extra_data(addr, objectLength);
			printf_filtered("\n");
		} else {
			value_ptr valptr = value_from_longest(lookup_pointer_type(type), addr);
			int histindex = record_latest_value(valptr);
			if (histindex >= 0) printf_filtered ("$%d = ", histindex);
			value_print(valptr, gdb_stdout, 0, Val_prettyprint);
			printf_filtered("\n");
		}
	}
}

/* ARGSUSED */
static void
dobj_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	print_object(arg, 1);
}

/* ARGSUSED */
static void
pobj_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	print_object(arg, 0);
}

/* ARGSUSED */
static void
getint_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	char shellCommand[128];
	
	sprintf(shellCommand, "getint %s", arg);
	local_shell_escape(shellCommand);
}

/* ARGSUSED */
static void
getindexical_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	char shellCommand[128];

	sprintf(shellCommand, "getindexical %s", arg);
	local_shell_escape(shellCommand);
}

/* ARGSUSED */
static void
exc_command (arg, from_tty)
     char *arg;
     int from_tty;
{
	char shellCommand[128];
	ulong exception;
	
	sprintf(shellCommand, "getexc %s", arg);
	local_shell_escape(shellCommand);
}

static CORE_ADDR dispatch_method_addr = -1, dispatch_inherited_addr = -1, dispatch_delegated_addr = -1, dispatch_intrinsic_addr = -1;
CORE_ADDR do_dispatch_method_addr = -1, do_dispatch_intrinsic_addr = -1;

static CORE_ADDR
lookup_address(const char *name)
{
  struct symbol *sym = lookup_symbol(name, NULL, VAR_NAMESPACE, NULL, NULL);
  if (sym)
    return BLOCK_START(SYMBOL_BLOCK_VALUE(sym));
  else
    {
/*      printf("Couldn't find %s!\n", name); */
      return -1;
    }
}

void
init_magic()
{
  dispatch_method_addr = lookup_address("__DispatchMethod");
  dispatch_inherited_addr = lookup_address("__DispatchInherited");
  dispatch_delegated_addr = lookup_address("__DispatchDelegated");
  dispatch_intrinsic_addr = lookup_address("__DispatchIntrinsic");
  do_dispatch_method_addr = lookup_address("__DoTheDispatch");
  do_dispatch_intrinsic_addr = lookup_address("__DoDispatchIntrinsic");
} 

int
is_dispatch(CORE_ADDR pc)
{
  return (pc == dispatch_method_addr) || (pc == dispatch_inherited_addr) || (pc == dispatch_delegated_addr);
}

int
is_dispatch_intrinsic(CORE_ADDR pc)
{
  return pc == dispatch_intrinsic_addr;
}

/* If we are stopped at one of the entry points to the dispatcher, we want to continue until just
   before we jump to the implementation.  If we are at that point, we want to continue until we
   actually get to the implementation.  Likewise for the intrinsic dispatcher
   */
CORE_ADDR 
deal_with_dispatch(CORE_ADDR stop_pc)
{
  if (is_dispatch(stop_pc))
    return do_dispatch_method_addr;
  else if (is_dispatch_intrinsic(stop_pc))
    return do_dispatch_intrinsic_addr;
  else if (stop_pc == do_dispatch_method_addr)
    /* This assumes that we branch through t6 */
    return read_register(14);
  else if (stop_pc == do_dispatch_intrinsic_addr)
    /* This assumes that we branch through t0 */
    return read_register(8);
  else
    return 0;
}

void
magic_create_inferior_hook()
{
	struct symbol *sym = lookup_symbol("gHandleError", NULL, VAR_NAMESPACE, NULL, NULL);
	if (sym)
		{
			CORE_ADDR addr = SYMBOL_VALUE(sym);
			unsigned long errorDebugger = 2;
			target_write_memory(addr, &errorDebugger, 4);
		}

	init_magic ();
}


_initialize_magic ()
{
	add_com ("dobj", class_support, dobj_command, "Display Object Contents");
	add_com ("pobj", class_support, pobj_command, "Print object base pointer");
	add_com ("getint", class_support, getint_command, "Convert intrinsic name to number or vice versa.");
	add_com ("getindexical", class_support, getindexical_command, "Convert indexical name to number or vice versa.");
	add_com ("exc", class_support, exc_command, "Convert exception name to number or vice versa.");

#ifdef DYNAMIC_COMMAND_SUPPORT
  add_com ("dlopen", class_support, dlopen_command,
	   "Load the dynamic library specified and execute the specified symbol");
#endif
}
Commit	Line	Data
cd10c7e3 SG	1	#include "defs.h"
	2	#include "gdbcmd.h"
	3	#include "symtab.h"
	4	#include "value.h"
	5	#include <ctype.h>
	6	#include <string.h>
	7	#ifdef DYNAMIC_COMMAND_SUPPORT
	8	#include <dlfcn.h>
	9	#endif
	10
	11	typedef unsigned long ulong;
	12
	13	#ifdef DYNAMIC_COMMAND_SUPPORT
	14	static void
	15	dlopen_command PARAMS ((char *, int));
	16	#endif
	17
	18	#ifdef DYNAMIC_COMMAND_SUPPORT
	19	/* ARGSUSED */
	20	static void
	21	dlopen_command (arg, from_tty)
	22	char *arg;
	23	int from_tty;
	24	{
	25	char *p;
	26	void *hdl;
	27	void (*sym)();
	28
	29	if (arg == 0) {
	30	error ("No arguments specified.");
	31	return;
	32	}
	33	p = arg;
	34	while(p != ' ' && p != '\0')
	35	p++;
	36	if (*p != ' ') {
	37	error ("Not enough arguments.");
	38	return;
	39	}
	40	*p++ = '\0';
	41
	42	hdl = dlopen(arg, RTLD_NOW);
	43	if (hdl == NULL) {
	44	fprintf(stderr, "%s: %s\n", arg, dlerror());
	45	return;
	46	}
	47	sym = dlsym(hdl, p);
	48
	49	if (sym == NULL) {
	50	fprintf(stderr, "%s: %s\n", p, dlerror());
	51	return;
	52	}
	53
	54	sym();
	55	}
	56	#endif
	57
	58	static void
	59	local_shell_escape (char *arg)
	60	{
	61	#ifdef CANT_FORK
	62	/* FIXME: what about errors (I don't know how GO32 system() handles
	63	them)? */
	64	system (arg);
65	#else /* Can fork. */
66	int rc, status, pid;
67	char p, user_shell;
68
69	if ((user_shell = (char *) getenv ("SHELL")) == NULL)
70	user_shell = "/bin/sh";
71
72	/* Get the name of the shell for arg0 */
73	if ((p = strrchr (user_shell, '/')) == NULL)
74	p = user_shell;
75	else
76	p++; /* Get past '/' */
77
78	if ((pid = fork()) == 0)
79	{
80	if (!arg)
81	execl (user_shell, p, 0);
82	else
83	execl (user_shell, p, "-c", arg, 0);
84
85	fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell,
86	safe_strerror (errno));
87	gdb_flush (gdb_stderr);
88	_exit (0177);
89	}
90
91	if (pid != -1)
92	while ((rc = wait (&status)) != pid && rc != -1)
93	;
94	else
95	error ("Fork failed");
96	#endif /* Can fork. */
97	}
98
99	static void
100	GetClassName(long objectID, char* name)
101	{
102	register value_ptr val;
103	register struct symbol *sym;
104	struct minimal_symbol *msymbol;
105	struct type *type;
106	value_ptr blocklen;
107	LONGEST maddr;
108
109	/* Find the address of RemoteGetClassName in the inferior. */
110
111	sym = lookup_symbol ("RemoteGetClassName", 0, VAR_NAMESPACE, 0, NULL);
112	if (sym != NULL)
113	{
114	if (SYMBOL_CLASS (sym) != LOC_BLOCK)
115	{
116	error ("\"RemoteGetClassName\" exists in this program but is not a function.");
117	}
118	val = value_of_variable (sym, NULL);
119	}
120	else
121	{
122	msymbol = lookup_minimal_symbol ("RemoteGetClassName", "", (struct objfile *) NULL);
123	if (msymbol != NULL)
124	{
125	type = lookup_pointer_type (builtin_type_char);
126	type = lookup_function_type (type);
127	type = lookup_pointer_type (type);
128	maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol);
129	val = value_from_longest (type, maddr);
130	}
131	else
132	{
133	error ("evaluation of this expression requires the program to have a function \"RemoteGetClassName\".");
134	}
135	}
136
137	blocklen = value_from_longest (builtin_type_int, (LONGEST) objectID);
138	val = call_function_by_hand (val, 1, &blocklen);
139	if (value_logical_not (val))
140	{
141	error ("Could not get class name.");
142	}
143	read_memory(value_as_pointer(val), name, 32);
144
145	}
146
147	static CORE_ADDR
148	GetBasePtr(long objectID)
149	{
150	register value_ptr val;
151	register struct symbol *sym;
152	struct minimal_symbol *msymbol;
153	struct type *type;
154	value_ptr blocklen;
155	LONGEST maddr;
156
157	/* Find the address of RemoteGetBasePtr in the inferior. */
158
159	sym = lookup_symbol ("RemoteGetBasePtr", 0, VAR_NAMESPACE, 0, NULL);
160	if (sym != NULL)
161	{
162	if (SYMBOL_CLASS (sym) != LOC_BLOCK)
163	{
164	error ("\"RemoteGetBasePtr\" exists in this program but is not a function.");
165	}
166	val = value_of_variable (sym, NULL);
167	}
168	else
169	{
170	msymbol = lookup_minimal_symbol ("RemoteGetBasePtr", "", (struct objfile *) NULL);
171	if (msymbol != NULL)
172	{
173	type = lookup_pointer_type (builtin_type_char);
174	type = lookup_function_type (type);
175	type = lookup_pointer_type (type);
176	maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol);
177	val = value_from_longest (type, maddr);
178	}
179	else
180	{
181	error ("evaluation of this expression requires the program to have a function \"RemoteGetBasePtr\".");
182	}
183	}
184
185	blocklen = value_from_longest (builtin_type_int, (LONGEST) objectID);
186	val = call_function_by_hand (val, 1, &blocklen);
187	if (value_logical_not (val))
188	{
189	error ("Could not get base pointer to object.");
190	}
191	return value_as_pointer(val);
192	}
193
194	static void
195	dump_extra_data(CORE_ADDR addr, ulong length)
196	{
197	ulong buf[5], chunk, i;
198	char *p;
199
200	while (length > 3) {
201	chunk = (length > 16) ? 16 : length;
202
203	memset(buf, 0, 5*sizeof(long));
204	read_memory(addr, &buf, chunk);
205	fprintf(gdb_stdout, "%08lx %08lx %08lx %08lx \| ", buf[0],
206	buf[1], buf[2], buf[3]);
207	for (i = 0, p = (char*)buf; i < chunk; i++, p++) {
208	if (!isprint(*p))
209	*p = '.';
210	}
211	fprintf(gdb_stdout, "%s \|\n", buf);
212	addr += chunk;
213	length -= chunk;
214	}
215	}
216
217	struct type *type_of_object(CORE_ADDR object)
218	{
219	char className[32], classAllFieldsName[128];
220	struct type *type = NULL;
221	GetClassName(object, className);
222	sprintf(classAllFieldsName, "%s_AllFields", className);
223
224	type = lookup_typename(classAllFieldsName, (struct block *)NULL, 0);
225	return lookup_pointer_type(type);
226	}
227
228	CORE_ADDR baseptr_of_object(ulong object)
229	{
230	return GetBasePtr(object) + 12;
231	}
232
233	/* ARGSUSED */
234	static void
235	print_object (arg, dump)
236	char *arg;
237	int dump;
238	{
239	CORE_ADDR addr;
240	ulong object, objectLength, typeLength = 0;
241	char className[32], classAllFieldsName[128];
242	struct type* type = NULL;
243
244	object = parse_and_eval_address(arg);
245
246	GetClassName(object, className);
247	sprintf(classAllFieldsName, "%s_AllFields", className);
248
249	type = lookup_typename(classAllFieldsName, (struct block *)NULL, 0);
250	typeLength = TYPE_LENGTH(type);
251	addr = GetBasePtr(object);
252	read_memory(addr, &objectLength, 4);
253	objectLength -= 12;
254	addr += 12;
255	if (TYPE_CODE(type) != TYPE_CODE_UNDEF && !(TYPE_FLAGS(type)&TYPE_FLAG_STUB)) {
256	if (dump) {
257	value_ptr valptr = value_at_lazy(type, addr);
258	int histindex = record_latest_value(valptr);
259	printf_filtered("Object 0x%08lx at address 0x%08lx of class %s\n",
260	object, addr, className);
261	if (histindex >= 0) printf_filtered ("$%d = ", histindex);
262	value_print(valptr, gdb_stdout, 0, Val_prettyprint);
263	objectLength -= typeLength;
264	addr += typeLength;
265	printf_filtered("\n");
266	dump_extra_data(addr, objectLength);
267	printf_filtered("\n");
268	} else {
269	value_ptr valptr = value_from_longest(lookup_pointer_type(type), addr);
270	int histindex = record_latest_value(valptr);
271	if (histindex >= 0) printf_filtered ("$%d = ", histindex);
272	value_print(valptr, gdb_stdout, 0, Val_prettyprint);
273	printf_filtered("\n");
274	}
275	}
276	}
277
278	/* ARGSUSED */
279	static void
280	dobj_command (arg, from_tty)
281	char *arg;
282	int from_tty;
283	{
284	print_object(arg, 1);
285	}
286
287	/* ARGSUSED */
288	static void
289	pobj_command (arg, from_tty)
290	char *arg;
291	int from_tty;
292	{
293	print_object(arg, 0);
294	}
295
296	/* ARGSUSED */
297	static void
298	getint_command (arg, from_tty)
299	char *arg;
300	int from_tty;
301	{
302	char shellCommand[128];
303
304	sprintf(shellCommand, "getint %s", arg);
305	local_shell_escape(shellCommand);
306	}
307
308	/* ARGSUSED */
309	static void
310	getindexical_command (arg, from_tty)
311	char *arg;
312	int from_tty;
313	{
314	char shellCommand[128];
315
316	sprintf(shellCommand, "getindexical %s", arg);
317	local_shell_escape(shellCommand);
318	}
319
320	/* ARGSUSED */
321	static void
322	exc_command (arg, from_tty)
323	char *arg;
324	int from_tty;
325	{
326	char shellCommand[128];
327	ulong exception;
328
329	sprintf(shellCommand, "getexc %s", arg);
330	local_shell_escape(shellCommand);
331	}
332
333	static CORE_ADDR dispatch_method_addr = -1, dispatch_inherited_addr = -1, dispatch_delegated_addr = -1, dispatch_intrinsic_addr = -1;
334	CORE_ADDR do_dispatch_method_addr = -1, do_dispatch_intrinsic_addr = -1;
335
336	static CORE_ADDR
337	lookup_address(const char *name)
338	{
339	struct symbol *sym = lookup_symbol(name, NULL, VAR_NAMESPACE, NULL, NULL);
340	if (sym)
341	return BLOCK_START(SYMBOL_BLOCK_VALUE(sym));
342	else
343	{
344	/* printf("Couldn't find %s!\n", name); */
345	return -1;
346	}
347	}
348
349	void
350	init_magic()
351	{
352	dispatch_method_addr = lookup_address("__DispatchMethod");
353	dispatch_inherited_addr = lookup_address("__DispatchInherited");
354	dispatch_delegated_addr = lookup_address("__DispatchDelegated");
355	dispatch_intrinsic_addr = lookup_address("__DispatchIntrinsic");
356	do_dispatch_method_addr = lookup_address("__DoTheDispatch");
357	do_dispatch_intrinsic_addr = lookup_address("__DoDispatchIntrinsic");
358	}
359
360	int
361	is_dispatch(CORE_ADDR pc)
362	{
363	return (pc == dispatch_method_addr) \|\| (pc == dispatch_inherited_addr) \|\| (pc == dispatch_delegated_addr);
364	}
365
366	int
367	is_dispatch_intrinsic(CORE_ADDR pc)
368	{
369	return pc == dispatch_intrinsic_addr;
370	}
371
372	/* If we are stopped at one of the entry points to the dispatcher, we want to continue until just
373	before we jump to the implementation. If we are at that point, we want to continue until we
374	actually get to the implementation. Likewise for the intrinsic dispatcher
375	*/
376	CORE_ADDR
377	deal_with_dispatch(CORE_ADDR stop_pc)
378	{
379	if (is_dispatch(stop_pc))
380	return do_dispatch_method_addr;
381	else if (is_dispatch_intrinsic(stop_pc))
382	return do_dispatch_intrinsic_addr;
383	else if (stop_pc == do_dispatch_method_addr)
384	/* This assumes that we branch through t6 */
385	return read_register(14);
386	else if (stop_pc == do_dispatch_intrinsic_addr)
387	/* This assumes that we branch through t0 */
388	return read_register(8);
389	else
390	return 0;
391	}
392
393	void
394	magic_create_inferior_hook()
395	{
396	struct symbol *sym = lookup_symbol("gHandleError", NULL, VAR_NAMESPACE, NULL, NULL);
397	if (sym)
398	{
399	CORE_ADDR addr = SYMBOL_VALUE(sym);
400	unsigned long errorDebugger = 2;
401	target_write_memory(addr, &errorDebugger, 4);
402	}
403
404	init_magic ();
405	}
406
407
408	_initialize_magic ()
409	{
410	add_com ("dobj", class_support, dobj_command, "Display Object Contents");
411	add_com ("pobj", class_support, pobj_command, "Print object base pointer");
412	add_com ("getint", class_support, getint_command, "Convert intrinsic name to number or vice versa.");
413	add_com ("getindexical", class_support, getindexical_command, "Convert indexical name to number or vice versa.");
414	add_com ("exc", class_support, exc_command, "Convert exception name to number or vice versa.");
415
416	#ifdef DYNAMIC_COMMAND_SUPPORT
417	add_com ("dlopen", class_support, dlopen_command,
418	"Load the dynamic library specified and execute the specified symbol");
419	#endif
420	}