[deliverable/binutils-gdb.git] / gdb / gdbserver / regcache.c

/* Register support routines for the remote server for GDB.
   Copyright (C) 2001-2013 Free Software Foundation, Inc.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "server.h"
#include "regdef.h"
#include "gdbthread.h"
#include "tdesc.h"

#include <stdlib.h>
#include <string.h>

#ifndef IN_PROCESS_AGENT

struct regcache *
get_thread_regcache (struct thread_info *thread, int fetch)
{
  struct regcache *regcache;

  regcache = (struct regcache *) inferior_regcache_data (thread);

  /* Threads' regcaches are created lazily, because biarch targets add
     the main thread/lwp before seeing it stop for the first time, and
     it is only after the target sees the thread stop for the first
     time that the target has a chance of determining the process's
     architecture.  IOW, when we first add the process's main thread
     we don't know which architecture/tdesc its regcache should
     have.  */
  if (regcache == NULL)
    {
      struct process_info *proc = get_thread_process (thread);

      if (proc->tdesc == NULL)
	fatal ("no target description");

      regcache = new_register_cache (proc->tdesc);
      set_inferior_regcache_data (thread, regcache);
    }

  if (fetch && regcache->registers_valid == 0)
    {
      struct thread_info *saved_inferior = current_inferior;

      current_inferior = thread;
      fetch_inferior_registers (regcache, -1);
      current_inferior = saved_inferior;
      regcache->registers_valid = 1;
    }

  return regcache;
}

void
regcache_invalidate_thread (struct thread_info *thread)
{
  struct regcache *regcache;

  regcache = (struct regcache *) inferior_regcache_data (thread);

  if (regcache == NULL)
    return;

  if (regcache->registers_valid)
    {
      struct thread_info *saved_inferior = current_inferior;

      current_inferior = thread;
      store_inferior_registers (regcache, -1);
      current_inferior = saved_inferior;
    }

  regcache->registers_valid = 0;
}

static int
regcache_invalidate_one (struct inferior_list_entry *entry,
			 void *pid_p)
{
  struct thread_info *thread = (struct thread_info *) entry;
  int pid = *(int *) pid_p;

  /* Only invalidate the regcaches of threads of this process.  */
  if (ptid_get_pid (entry->id) == pid)
    regcache_invalidate_thread (thread);

  return 0;
}

void
regcache_invalidate (void)
{
  /* Only update the threads of the current process.  */
  int pid = ptid_get_pid (current_inferior->entry.id);

  find_inferior (&all_threads, regcache_invalidate_one, &pid);
}

#endif

struct regcache *
init_register_cache (struct regcache *regcache,
		     const struct target_desc *tdesc,
		     unsigned char *regbuf)
{
#ifndef IN_PROCESS_AGENT
  if (regbuf == NULL)
    {
      /* Make sure to zero-initialize the register cache when it is
	 created, in case there are registers the target never
	 fetches.  This way they'll read as zero instead of
	 garbage.  */
      regcache->tdesc = tdesc;
      regcache->registers = xcalloc (1, tdesc->registers_size);
      regcache->registers_owned = 1;
      regcache->register_status = xcalloc (1, tdesc->num_registers);
      gdb_assert (REG_UNAVAILABLE == 0);
    }
  else
#else
  if (regbuf == NULL)
    fatal ("init_register_cache: can't allocate memory from the heap");
  else
#endif
    {
      regcache->tdesc = tdesc;
      regcache->registers = regbuf;
      regcache->registers_owned = 0;
#ifndef IN_PROCESS_AGENT
      regcache->register_status = NULL;
#endif
    }

  regcache->registers_valid = 0;

  return regcache;
}

#ifndef IN_PROCESS_AGENT

struct regcache *
new_register_cache (const struct target_desc *tdesc)
{
  struct regcache *regcache;

  gdb_assert (tdesc->registers_size != 0);

  regcache = xmalloc (sizeof (*regcache));
  return init_register_cache (regcache, tdesc, NULL);
}

void
free_register_cache (struct regcache *regcache)
{
  if (regcache)
    {
      if (regcache->registers_owned)
	free (regcache->registers);
      free (regcache->register_status);
      free (regcache);
    }
}

#endif

void
regcache_cpy (struct regcache *dst, struct regcache *src)
{
  gdb_assert (src != NULL && dst != NULL);
  gdb_assert (src->tdesc == dst->tdesc);
  gdb_assert (src != dst);

  memcpy (dst->registers, src->registers, src->tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
  if (dst->register_status != NULL && src->register_status != NULL)
    memcpy (dst->register_status, src->register_status,
	    src->tdesc->num_registers);
#endif
  dst->registers_valid = src->registers_valid;
}


#ifndef IN_PROCESS_AGENT

void
registers_to_string (struct regcache *regcache, char *buf)
{
  unsigned char *registers = regcache->registers;
  const struct target_desc *tdesc = regcache->tdesc;
  int i;

  for (i = 0; i < tdesc->num_registers; i++)
    {
      if (regcache->register_status[i] == REG_VALID)
	{
	  convert_int_to_ascii (registers, buf,
				register_size (tdesc, i));
	  buf += register_size (tdesc, i) * 2;
	}
      else
	{
	  memset (buf, 'x', register_size (tdesc, i) * 2);
	  buf += register_size (tdesc, i) * 2;
	}
      registers += register_size (tdesc, i);
    }
  *buf = '\0';
}

void
registers_from_string (struct regcache *regcache, char *buf)
{
  int len = strlen (buf);
  unsigned char *registers = regcache->registers;
  const struct target_desc *tdesc = regcache->tdesc;

  if (len != tdesc->registers_size * 2)
    {
      warning ("Wrong sized register packet (expected %d bytes, got %d)",
	       2 * tdesc->registers_size, len);
      if (len > tdesc->registers_size * 2)
	len = tdesc->registers_size * 2;
    }
  convert_ascii_to_int (buf, registers, len / 2);
}

struct reg *
find_register_by_name (const struct target_desc *tdesc, const char *name)
{
  int i;

  for (i = 0; i < tdesc->num_registers; i++)
    if (strcmp (name, tdesc->reg_defs[i].name) == 0)
      return &tdesc->reg_defs[i];
  fatal ("Unknown register %s requested", name);
  return 0;
}

int
find_regno (const struct target_desc *tdesc, const char *name)
{
  int i;

  for (i = 0; i < tdesc->num_registers; i++)
    if (strcmp (name, tdesc->reg_defs[i].name) == 0)
      return i;
  fatal ("Unknown register %s requested", name);
  return -1;
}

struct reg *
find_register_by_number (const struct target_desc *tdesc, int n)
{
  return &tdesc->reg_defs[n];
}

#endif

#ifndef IN_PROCESS_AGENT
static void
free_register_cache_thread (struct thread_info *thread)
{
  struct regcache *regcache
    = (struct regcache *) inferior_regcache_data (thread);

  if (regcache != NULL)
    {
      regcache_invalidate_thread (thread);
      free_register_cache (regcache);
      set_inferior_regcache_data (thread, NULL);
    }
}

static void
free_register_cache_thread_one (struct inferior_list_entry *entry)
{
  struct thread_info *thread = (struct thread_info *) entry;

  free_register_cache_thread (thread);
}

void
regcache_release (void)
{
  /* Flush and release all pre-existing register caches.  */
  for_each_inferior (&all_threads, free_register_cache_thread_one);
}
#endif

int
register_cache_size (const struct target_desc *tdesc)
{
  return tdesc->registers_size;
}

int
register_size (const struct target_desc *tdesc, int n)
{
  return tdesc->reg_defs[n].size / 8;
}

static unsigned char *
register_data (struct regcache *regcache, int n, int fetch)
{
  return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
}

/* Supply register N, whose contents are stored in BUF, to REGCACHE.
   If BUF is NULL, the register's value is recorded as
   unavailable.  */

void
supply_register (struct regcache *regcache, int n, const void *buf)
{
  if (buf)
    {
      memcpy (register_data (regcache, n, 0), buf,
	      register_size (regcache->tdesc, n));
#ifndef IN_PROCESS_AGENT
      if (regcache->register_status != NULL)
	regcache->register_status[n] = REG_VALID;
#endif
    }
  else
    {
      memset (register_data (regcache, n, 0), 0,
	      register_size (regcache->tdesc, n));
#ifndef IN_PROCESS_AGENT
      if (regcache->register_status != NULL)
	regcache->register_status[n] = REG_UNAVAILABLE;
#endif
    }
}

/* Supply register N with value zero to REGCACHE.  */

void
supply_register_zeroed (struct regcache *regcache, int n)
{
  memset (register_data (regcache, n, 0), 0,
	  register_size (regcache->tdesc, n));
#ifndef IN_PROCESS_AGENT
  if (regcache->register_status != NULL)
    regcache->register_status[n] = REG_VALID;
#endif
}

/* Supply the whole register set whose contents are stored in BUF, to
   REGCACHE.  If BUF is NULL, all the registers' values are recorded
   as unavailable.  */

void
supply_regblock (struct regcache *regcache, const void *buf)
{
  if (buf)
    {
      const struct target_desc *tdesc = regcache->tdesc;

      memcpy (regcache->registers, buf, tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
      {
	int i;

	for (i = 0; i < tdesc->num_registers; i++)
	  regcache->register_status[i] = REG_VALID;
      }
#endif
    }
  else
    {
      const struct target_desc *tdesc = regcache->tdesc;

      memset (regcache->registers, 0, tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
      {
	int i;

	for (i = 0; i < tdesc->num_registers; i++)
	  regcache->register_status[i] = REG_UNAVAILABLE;
      }
#endif
    }
}

#ifndef IN_PROCESS_AGENT

void
supply_register_by_name (struct regcache *regcache,
			 const char *name, const void *buf)
{
  supply_register (regcache, find_regno (regcache->tdesc, name), buf);
}

#endif

void
collect_register (struct regcache *regcache, int n, void *buf)
{
  memcpy (buf, register_data (regcache, n, 1),
	  register_size (regcache->tdesc, n));
}

#ifndef IN_PROCESS_AGENT

void
collect_register_as_string (struct regcache *regcache, int n, char *buf)
{
  convert_int_to_ascii (register_data (regcache, n, 1), buf,
			register_size (regcache->tdesc, n));
}

void
collect_register_by_name (struct regcache *regcache,
			  const char *name, void *buf)
{
  collect_register (regcache, find_regno (regcache->tdesc, name), buf);
}

/* Special handling for register PC.  */

CORE_ADDR
regcache_read_pc (struct regcache *regcache)
{
  CORE_ADDR pc_val;

  if (the_target->read_pc)
    pc_val = the_target->read_pc (regcache);
  else
    internal_error (__FILE__, __LINE__,
		    "regcache_read_pc: Unable to find PC");

  return pc_val;
}

void
regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
  if (the_target->write_pc)
    the_target->write_pc (regcache, pc);
  else
    internal_error (__FILE__, __LINE__,
		    "regcache_write_pc: Unable to update PC");
}

#endif
Commit	Line	Data
	1	/* Register support routines for the remote server for GDB.
	2	Copyright (C) 2001-2013 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 3 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	18
	19	#include "server.h"
	20	#include "regdef.h"
	21	#include "gdbthread.h"
	22	#include "tdesc.h"
	23
	24	#include <stdlib.h>
	25	#include <string.h>
	26
	27	#ifndef IN_PROCESS_AGENT
	28
	29	struct regcache *
	30	get_thread_regcache (struct thread_info *thread, int fetch)
	31	{
	32	struct regcache *regcache;
	33
	34	regcache = (struct regcache *) inferior_regcache_data (thread);
	35
	36	/* Threads' regcaches are created lazily, because biarch targets add
	37	the main thread/lwp before seeing it stop for the first time, and
	38	it is only after the target sees the thread stop for the first
	39	time that the target has a chance of determining the process's
	40	architecture. IOW, when we first add the process's main thread
	41	we don't know which architecture/tdesc its regcache should
	42	have. */
	43	if (regcache == NULL)
	44	{
	45	struct process_info *proc = get_thread_process (thread);
	46
	47	if (proc->tdesc == NULL)
	48	fatal ("no target description");
	49
	50	regcache = new_register_cache (proc->tdesc);
	51	set_inferior_regcache_data (thread, regcache);
	52	}
	53
	54	if (fetch && regcache->registers_valid == 0)
	55	{
	56	struct thread_info *saved_inferior = current_inferior;
	57
	58	current_inferior = thread;
	59	fetch_inferior_registers (regcache, -1);
	60	current_inferior = saved_inferior;
	61	regcache->registers_valid = 1;
	62	}
	63
	64	return regcache;
	65	}
	66
	67	void
	68	regcache_invalidate_thread (struct thread_info *thread)
	69	{
	70	struct regcache *regcache;
	71
	72	regcache = (struct regcache *) inferior_regcache_data (thread);
	73
	74	if (regcache == NULL)
	75	return;
	76
	77	if (regcache->registers_valid)
	78	{
	79	struct thread_info *saved_inferior = current_inferior;
	80
	81	current_inferior = thread;
	82	store_inferior_registers (regcache, -1);
	83	current_inferior = saved_inferior;
	84	}
	85
	86	regcache->registers_valid = 0;
	87	}
	88
	89	static int
	90	regcache_invalidate_one (struct inferior_list_entry *entry,
	91	void *pid_p)
	92	{
	93	struct thread_info thread = (struct thread_info ) entry;
	94	int pid = (int ) pid_p;
	95
	96	/* Only invalidate the regcaches of threads of this process. */
	97	if (ptid_get_pid (entry->id) == pid)
	98	regcache_invalidate_thread (thread);
	99
	100	return 0;
	101	}
	102
	103	void
	104	regcache_invalidate (void)
	105	{
	106	/* Only update the threads of the current process. */
	107	int pid = ptid_get_pid (current_inferior->entry.id);
	108
	109	find_inferior (&all_threads, regcache_invalidate_one, &pid);
	110	}
	111
	112	#endif
	113
	114	struct regcache *
	115	init_register_cache (struct regcache *regcache,
	116	const struct target_desc *tdesc,
	117	unsigned char *regbuf)
	118	{
	119	#ifndef IN_PROCESS_AGENT
	120	if (regbuf == NULL)
	121	{
	122	/* Make sure to zero-initialize the register cache when it is
	123	created, in case there are registers the target never
	124	fetches. This way they'll read as zero instead of
	125	garbage. */
	126	regcache->tdesc = tdesc;
	127	regcache->registers = xcalloc (1, tdesc->registers_size);
	128	regcache->registers_owned = 1;
	129	regcache->register_status = xcalloc (1, tdesc->num_registers);
	130	gdb_assert (REG_UNAVAILABLE == 0);
	131	}
	132	else
	133	#else
	134	if (regbuf == NULL)
	135	fatal ("init_register_cache: can't allocate memory from the heap");
	136	else
	137	#endif
	138	{
	139	regcache->tdesc = tdesc;
	140	regcache->registers = regbuf;
	141	regcache->registers_owned = 0;
	142	#ifndef IN_PROCESS_AGENT
	143	regcache->register_status = NULL;
	144	#endif
	145	}
	146
	147	regcache->registers_valid = 0;
	148
	149	return regcache;
	150	}
	151
	152	#ifndef IN_PROCESS_AGENT
	153
	154	struct regcache *
	155	new_register_cache (const struct target_desc *tdesc)
	156	{
	157	struct regcache *regcache;
	158
	159	gdb_assert (tdesc->registers_size != 0);
	160
	161	regcache = xmalloc (sizeof (*regcache));
	162	return init_register_cache (regcache, tdesc, NULL);
	163	}
	164
	165	void
	166	free_register_cache (struct regcache *regcache)
	167	{
	168	if (regcache)
	169	{
	170	if (regcache->registers_owned)
	171	free (regcache->registers);
	172	free (regcache->register_status);
	173	free (regcache);
	174	}
	175	}
	176
	177	#endif
	178
	179	void
	180	regcache_cpy (struct regcache dst, struct regcache src)
	181	{
	182	gdb_assert (src != NULL && dst != NULL);
	183	gdb_assert (src->tdesc == dst->tdesc);
	184	gdb_assert (src != dst);
	185
	186	memcpy (dst->registers, src->registers, src->tdesc->registers_size);
	187	#ifndef IN_PROCESS_AGENT
	188	if (dst->register_status != NULL && src->register_status != NULL)
	189	memcpy (dst->register_status, src->register_status,
	190	src->tdesc->num_registers);
	191	#endif
	192	dst->registers_valid = src->registers_valid;
	193	}
	194
	195
	196	#ifndef IN_PROCESS_AGENT
	197
	198	void
	199	registers_to_string (struct regcache regcache, char buf)
	200	{
	201	unsigned char *registers = regcache->registers;
	202	const struct target_desc *tdesc = regcache->tdesc;
	203	int i;
	204
	205	for (i = 0; i < tdesc->num_registers; i++)
	206	{
	207	if (regcache->register_status[i] == REG_VALID)
	208	{
	209	convert_int_to_ascii (registers, buf,
	210	register_size (tdesc, i));
	211	buf += register_size (tdesc, i) * 2;
	212	}
	213	else
	214	{
	215	memset (buf, 'x', register_size (tdesc, i) * 2);
	216	buf += register_size (tdesc, i) * 2;
	217	}
	218	registers += register_size (tdesc, i);
	219	}
	220	*buf = '\0';
	221	}
	222
	223	void
	224	registers_from_string (struct regcache regcache, char buf)
	225	{
	226	int len = strlen (buf);
	227	unsigned char *registers = regcache->registers;
	228	const struct target_desc *tdesc = regcache->tdesc;
	229
	230	if (len != tdesc->registers_size * 2)
	231	{
	232	warning ("Wrong sized register packet (expected %d bytes, got %d)",
	233	2 * tdesc->registers_size, len);
	234	if (len > tdesc->registers_size * 2)
	235	len = tdesc->registers_size * 2;
	236	}
	237	convert_ascii_to_int (buf, registers, len / 2);
	238	}
	239
	240	struct reg *
	241	find_register_by_name (const struct target_desc tdesc, const char name)
	242	{
	243	int i;
	244
	245	for (i = 0; i < tdesc->num_registers; i++)
	246	if (strcmp (name, tdesc->reg_defs[i].name) == 0)
	247	return &tdesc->reg_defs[i];
	248	fatal ("Unknown register %s requested", name);
	249	return 0;
	250	}
	251
	252	int
	253	find_regno (const struct target_desc tdesc, const char name)
	254	{
	255	int i;
	256
	257	for (i = 0; i < tdesc->num_registers; i++)
	258	if (strcmp (name, tdesc->reg_defs[i].name) == 0)
	259	return i;
	260	fatal ("Unknown register %s requested", name);
	261	return -1;
	262	}
	263
	264	struct reg *
	265	find_register_by_number (const struct target_desc *tdesc, int n)
	266	{
	267	return &tdesc->reg_defs[n];
	268	}
	269
	270	#endif
	271
	272	#ifndef IN_PROCESS_AGENT
	273	static void
	274	free_register_cache_thread (struct thread_info *thread)
	275	{
	276	struct regcache *regcache
	277	= (struct regcache *) inferior_regcache_data (thread);
	278
	279	if (regcache != NULL)
	280	{
	281	regcache_invalidate_thread (thread);
	282	free_register_cache (regcache);
	283	set_inferior_regcache_data (thread, NULL);
	284	}
	285	}
	286
	287	static void
	288	free_register_cache_thread_one (struct inferior_list_entry *entry)
	289	{
	290	struct thread_info thread = (struct thread_info ) entry;
	291
	292	free_register_cache_thread (thread);
	293	}
	294
	295	void
	296	regcache_release (void)
	297	{
	298	/* Flush and release all pre-existing register caches. */
	299	for_each_inferior (&all_threads, free_register_cache_thread_one);
	300	}
	301	#endif
	302
	303	int
	304	register_cache_size (const struct target_desc *tdesc)
	305	{
	306	return tdesc->registers_size;
	307	}
	308
	309	int
	310	register_size (const struct target_desc *tdesc, int n)
	311	{
	312	return tdesc->reg_defs[n].size / 8;
	313	}
	314
	315	static unsigned char *
	316	register_data (struct regcache *regcache, int n, int fetch)
	317	{
	318	return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
	319	}
	320
	321	/* Supply register N, whose contents are stored in BUF, to REGCACHE.
	322	If BUF is NULL, the register's value is recorded as
	323	unavailable. */
	324
	325	void
	326	supply_register (struct regcache regcache, int n, const void buf)
	327	{
	328	if (buf)
	329	{
	330	memcpy (register_data (regcache, n, 0), buf,
	331	register_size (regcache->tdesc, n));
	332	#ifndef IN_PROCESS_AGENT
	333	if (regcache->register_status != NULL)
	334	regcache->register_status[n] = REG_VALID;
	335	#endif
	336	}
	337	else
	338	{
	339	memset (register_data (regcache, n, 0), 0,
	340	register_size (regcache->tdesc, n));
	341	#ifndef IN_PROCESS_AGENT
	342	if (regcache->register_status != NULL)
	343	regcache->register_status[n] = REG_UNAVAILABLE;
	344	#endif
	345	}
	346	}
	347
	348	/* Supply register N with value zero to REGCACHE. */
	349
	350	void
	351	supply_register_zeroed (struct regcache *regcache, int n)
	352	{
	353	memset (register_data (regcache, n, 0), 0,
	354	register_size (regcache->tdesc, n));
	355	#ifndef IN_PROCESS_AGENT
	356	if (regcache->register_status != NULL)
	357	regcache->register_status[n] = REG_VALID;
	358	#endif
	359	}
	360
	361	/* Supply the whole register set whose contents are stored in BUF, to
	362	REGCACHE. If BUF is NULL, all the registers' values are recorded
	363	as unavailable. */
	364
	365	void
	366	supply_regblock (struct regcache regcache, const void buf)
	367	{
	368	if (buf)
	369	{
	370	const struct target_desc *tdesc = regcache->tdesc;
	371
	372	memcpy (regcache->registers, buf, tdesc->registers_size);
	373	#ifndef IN_PROCESS_AGENT
	374	{
	375	int i;
	376
	377	for (i = 0; i < tdesc->num_registers; i++)
	378	regcache->register_status[i] = REG_VALID;
	379	}
	380	#endif
	381	}
	382	else
	383	{
	384	const struct target_desc *tdesc = regcache->tdesc;
	385
	386	memset (regcache->registers, 0, tdesc->registers_size);
	387	#ifndef IN_PROCESS_AGENT
	388	{
	389	int i;
	390
	391	for (i = 0; i < tdesc->num_registers; i++)
	392	regcache->register_status[i] = REG_UNAVAILABLE;
	393	}
	394	#endif
	395	}
	396	}
	397
	398	#ifndef IN_PROCESS_AGENT
	399
	400	void
	401	supply_register_by_name (struct regcache *regcache,
	402	const char name, const void buf)
	403	{
	404	supply_register (regcache, find_regno (regcache->tdesc, name), buf);
	405	}
	406
	407	#endif
	408
	409	void
	410	collect_register (struct regcache regcache, int n, void buf)
	411	{
	412	memcpy (buf, register_data (regcache, n, 1),
	413	register_size (regcache->tdesc, n));
	414	}
	415
	416	#ifndef IN_PROCESS_AGENT
	417
	418	void
	419	collect_register_as_string (struct regcache regcache, int n, char buf)
	420	{
	421	convert_int_to_ascii (register_data (regcache, n, 1), buf,
	422	register_size (regcache->tdesc, n));
	423	}
	424
	425	void
	426	collect_register_by_name (struct regcache *regcache,
	427	const char name, void buf)
	428	{
	429	collect_register (regcache, find_regno (regcache->tdesc, name), buf);
	430	}
	431
	432	/* Special handling for register PC. */
	433
	434	CORE_ADDR
	435	regcache_read_pc (struct regcache *regcache)
	436	{
	437	CORE_ADDR pc_val;
	438
	439	if (the_target->read_pc)
	440	pc_val = the_target->read_pc (regcache);
	441	else
	442	internal_error (__FILE__, __LINE__,
	443	"regcache_read_pc: Unable to find PC");
	444
	445	return pc_val;
	446	}
	447
	448	void
	449	regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
	450	{
	451	if (the_target->write_pc)
	452	the_target->write_pc (regcache, pc);
	453	else
	454	internal_error (__FILE__, __LINE__,
	455	"regcache_write_pc: Unable to update PC");
	456	}
	457
	458	#endif