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

/* Register support routines for the remote server for GDB.
   Copyright (C) 2001-2014 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 "rsp-low.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);

      gdb_assert (proc->tdesc != NULL);

      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)
{
  if (regbuf == NULL)
    {
#ifndef IN_PROCESS_AGENT
      /* 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
      gdb_assert_not_reached ("can't allocate memory from the heap");
#endif
    }
  else
    {
      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)
	{
	  bin2hex (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;
    }
  hex2bin (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];
  internal_error (__FILE__, __LINE__, "Unknown register %s requested",
		  name);
}

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;
  internal_error (__FILE__, __LINE__, "Unknown register %s requested",
		  name);
}

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)
{
  bin2hex (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) 2001-2014 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	#include "rsp-low.h"
	24	#ifndef IN_PROCESS_AGENT
	25
	26	struct regcache *
	27	get_thread_regcache (struct thread_info *thread, int fetch)
	28	{
	29	struct regcache *regcache;
	30
	31	regcache = (struct regcache *) inferior_regcache_data (thread);
	32
	33	/* Threads' regcaches are created lazily, because biarch targets add
	34	the main thread/lwp before seeing it stop for the first time, and
	35	it is only after the target sees the thread stop for the first
	36	time that the target has a chance of determining the process's
	37	architecture. IOW, when we first add the process's main thread
	38	we don't know which architecture/tdesc its regcache should
	39	have. */
	40	if (regcache == NULL)
	41	{
	42	struct process_info *proc = get_thread_process (thread);
	43
	44	gdb_assert (proc->tdesc != NULL);
	45
	46	regcache = new_register_cache (proc->tdesc);
	47	set_inferior_regcache_data (thread, regcache);
	48	}
	49
	50	if (fetch && regcache->registers_valid == 0)
	51	{
	52	struct thread_info *saved_inferior = current_inferior;
	53
	54	current_inferior = thread;
	55	fetch_inferior_registers (regcache, -1);
	56	current_inferior = saved_inferior;
	57	regcache->registers_valid = 1;
	58	}
	59
	60	return regcache;
	61	}
	62
	63	void
	64	regcache_invalidate_thread (struct thread_info *thread)
	65	{
	66	struct regcache *regcache;
	67
	68	regcache = (struct regcache *) inferior_regcache_data (thread);
	69
	70	if (regcache == NULL)
	71	return;
	72
	73	if (regcache->registers_valid)
	74	{
	75	struct thread_info *saved_inferior = current_inferior;
	76
	77	current_inferior = thread;
	78	store_inferior_registers (regcache, -1);
	79	current_inferior = saved_inferior;
	80	}
	81
	82	regcache->registers_valid = 0;
	83	}
	84
	85	static int
	86	regcache_invalidate_one (struct inferior_list_entry *entry,
	87	void *pid_p)
	88	{
	89	struct thread_info thread = (struct thread_info ) entry;
	90	int pid = (int ) pid_p;
	91
	92	/* Only invalidate the regcaches of threads of this process. */
	93	if (ptid_get_pid (entry->id) == pid)
	94	regcache_invalidate_thread (thread);
	95
	96	return 0;
	97	}
	98
	99	void
	100	regcache_invalidate (void)
	101	{
	102	/* Only update the threads of the current process. */
	103	int pid = ptid_get_pid (current_inferior->entry.id);
	104
	105	find_inferior (&all_threads, regcache_invalidate_one, &pid);
	106	}
	107
	108	#endif
	109
	110	struct regcache *
	111	init_register_cache (struct regcache *regcache,
	112	const struct target_desc *tdesc,
	113	unsigned char *regbuf)
	114	{
	115	if (regbuf == NULL)
	116	{
	117	#ifndef IN_PROCESS_AGENT
	118	/* Make sure to zero-initialize the register cache when it is
	119	created, in case there are registers the target never
	120	fetches. This way they'll read as zero instead of
	121	garbage. */
	122	regcache->tdesc = tdesc;
	123	regcache->registers = xcalloc (1, tdesc->registers_size);
	124	regcache->registers_owned = 1;
	125	regcache->register_status = xcalloc (1, tdesc->num_registers);
	126	gdb_assert (REG_UNAVAILABLE == 0);
	127	#else
	128	gdb_assert_not_reached ("can't allocate memory from the heap");
	129	#endif
	130	}
	131	else
	132	{
	133	regcache->tdesc = tdesc;
	134	regcache->registers = regbuf;
	135	regcache->registers_owned = 0;
	136	#ifndef IN_PROCESS_AGENT
	137	regcache->register_status = NULL;
	138	#endif
	139	}
	140
	141	regcache->registers_valid = 0;
	142
	143	return regcache;
	144	}
	145
	146	#ifndef IN_PROCESS_AGENT
	147
	148	struct regcache *
	149	new_register_cache (const struct target_desc *tdesc)
	150	{
	151	struct regcache *regcache;
	152
	153	gdb_assert (tdesc->registers_size != 0);
	154
	155	regcache = xmalloc (sizeof (*regcache));
	156	return init_register_cache (regcache, tdesc, NULL);
	157	}
	158
	159	void
	160	free_register_cache (struct regcache *regcache)
	161	{
	162	if (regcache)
	163	{
	164	if (regcache->registers_owned)
	165	free (regcache->registers);
	166	free (regcache->register_status);
	167	free (regcache);
	168	}
	169	}
	170
	171	#endif
	172
	173	void
	174	regcache_cpy (struct regcache dst, struct regcache src)
	175	{
	176	gdb_assert (src != NULL && dst != NULL);
	177	gdb_assert (src->tdesc == dst->tdesc);
	178	gdb_assert (src != dst);
	179
	180	memcpy (dst->registers, src->registers, src->tdesc->registers_size);
	181	#ifndef IN_PROCESS_AGENT
	182	if (dst->register_status != NULL && src->register_status != NULL)
	183	memcpy (dst->register_status, src->register_status,
	184	src->tdesc->num_registers);
	185	#endif
	186	dst->registers_valid = src->registers_valid;
	187	}
	188
	189
	190	#ifndef IN_PROCESS_AGENT
	191
	192	void
	193	registers_to_string (struct regcache regcache, char buf)
	194	{
	195	unsigned char *registers = regcache->registers;
	196	const struct target_desc *tdesc = regcache->tdesc;
	197	int i;
	198
	199	for (i = 0; i < tdesc->num_registers; i++)
	200	{
	201	if (regcache->register_status[i] == REG_VALID)
	202	{
	203	bin2hex (registers, buf, register_size (tdesc, i));
	204	buf += register_size (tdesc, i) * 2;
	205	}
	206	else
	207	{
	208	memset (buf, 'x', register_size (tdesc, i) * 2);
	209	buf += register_size (tdesc, i) * 2;
	210	}
	211	registers += register_size (tdesc, i);
	212	}
	213	*buf = '\0';
	214	}
	215
	216	void
	217	registers_from_string (struct regcache regcache, char buf)
	218	{
	219	int len = strlen (buf);
	220	unsigned char *registers = regcache->registers;
	221	const struct target_desc *tdesc = regcache->tdesc;
	222
	223	if (len != tdesc->registers_size * 2)
	224	{
	225	warning ("Wrong sized register packet (expected %d bytes, got %d)",
	226	2 * tdesc->registers_size, len);
	227	if (len > tdesc->registers_size * 2)
	228	len = tdesc->registers_size * 2;
	229	}
	230	hex2bin (buf, registers, len / 2);
	231	}
	232
	233	struct reg *
	234	find_register_by_name (const struct target_desc tdesc, const char name)
	235	{
	236	int i;
	237
	238	for (i = 0; i < tdesc->num_registers; i++)
	239	if (strcmp (name, tdesc->reg_defs[i].name) == 0)
	240	return &tdesc->reg_defs[i];
	241	internal_error (__FILE__, __LINE__, "Unknown register %s requested",
	242	name);
	243	}
	244
	245	int
	246	find_regno (const struct target_desc tdesc, const char name)
	247	{
	248	int i;
	249
	250	for (i = 0; i < tdesc->num_registers; i++)
	251	if (strcmp (name, tdesc->reg_defs[i].name) == 0)
	252	return i;
	253	internal_error (__FILE__, __LINE__, "Unknown register %s requested",
	254	name);
	255	}
	256
	257	struct reg *
	258	find_register_by_number (const struct target_desc *tdesc, int n)
	259	{
	260	return &tdesc->reg_defs[n];
	261	}
	262
	263	#endif
	264
	265	#ifndef IN_PROCESS_AGENT
	266	static void
	267	free_register_cache_thread (struct thread_info *thread)
	268	{
	269	struct regcache *regcache
	270	= (struct regcache *) inferior_regcache_data (thread);
	271
	272	if (regcache != NULL)
	273	{
	274	regcache_invalidate_thread (thread);
	275	free_register_cache (regcache);
	276	set_inferior_regcache_data (thread, NULL);
	277	}
	278	}
	279
	280	static void
	281	free_register_cache_thread_one (struct inferior_list_entry *entry)
	282	{
	283	struct thread_info thread = (struct thread_info ) entry;
	284
	285	free_register_cache_thread (thread);
	286	}
	287
	288	void
	289	regcache_release (void)
	290	{
	291	/* Flush and release all pre-existing register caches. */
	292	for_each_inferior (&all_threads, free_register_cache_thread_one);
	293	}
	294	#endif
	295
	296	int
	297	register_cache_size (const struct target_desc *tdesc)
	298	{
	299	return tdesc->registers_size;
	300	}
	301
	302	int
	303	register_size (const struct target_desc *tdesc, int n)
	304	{
	305	return tdesc->reg_defs[n].size / 8;
	306	}
	307
	308	static unsigned char *
	309	register_data (struct regcache *regcache, int n, int fetch)
	310	{
	311	return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
	312	}
	313
	314	/* Supply register N, whose contents are stored in BUF, to REGCACHE.
	315	If BUF is NULL, the register's value is recorded as
	316	unavailable. */
	317
	318	void
	319	supply_register (struct regcache regcache, int n, const void buf)
	320	{
	321	if (buf)
	322	{
	323	memcpy (register_data (regcache, n, 0), buf,
	324	register_size (regcache->tdesc, n));
	325	#ifndef IN_PROCESS_AGENT
	326	if (regcache->register_status != NULL)
	327	regcache->register_status[n] = REG_VALID;
	328	#endif
	329	}
	330	else
	331	{
	332	memset (register_data (regcache, n, 0), 0,
	333	register_size (regcache->tdesc, n));
	334	#ifndef IN_PROCESS_AGENT
	335	if (regcache->register_status != NULL)
	336	regcache->register_status[n] = REG_UNAVAILABLE;
	337	#endif
	338	}
	339	}
	340
	341	/* Supply register N with value zero to REGCACHE. */
	342
	343	void
	344	supply_register_zeroed (struct regcache *regcache, int n)
	345	{
	346	memset (register_data (regcache, n, 0), 0,
	347	register_size (regcache->tdesc, n));
	348	#ifndef IN_PROCESS_AGENT
	349	if (regcache->register_status != NULL)
	350	regcache->register_status[n] = REG_VALID;
	351	#endif
	352	}
	353
	354	/* Supply the whole register set whose contents are stored in BUF, to
	355	REGCACHE. If BUF is NULL, all the registers' values are recorded
	356	as unavailable. */
	357
	358	void
	359	supply_regblock (struct regcache regcache, const void buf)
	360	{
	361	if (buf)
	362	{
	363	const struct target_desc *tdesc = regcache->tdesc;
	364
	365	memcpy (regcache->registers, buf, tdesc->registers_size);
	366	#ifndef IN_PROCESS_AGENT
	367	{
	368	int i;
	369
	370	for (i = 0; i < tdesc->num_registers; i++)
	371	regcache->register_status[i] = REG_VALID;
	372	}
	373	#endif
	374	}
	375	else
	376	{
	377	const struct target_desc *tdesc = regcache->tdesc;
	378
	379	memset (regcache->registers, 0, tdesc->registers_size);
	380	#ifndef IN_PROCESS_AGENT
	381	{
	382	int i;
	383
	384	for (i = 0; i < tdesc->num_registers; i++)
	385	regcache->register_status[i] = REG_UNAVAILABLE;
	386	}
	387	#endif
	388	}
	389	}
	390
	391	#ifndef IN_PROCESS_AGENT
	392
	393	void
	394	supply_register_by_name (struct regcache *regcache,
	395	const char name, const void buf)
	396	{
	397	supply_register (regcache, find_regno (regcache->tdesc, name), buf);
	398	}
	399
	400	#endif
	401
	402	void
	403	collect_register (struct regcache regcache, int n, void buf)
	404	{
	405	memcpy (buf, register_data (regcache, n, 1),
	406	register_size (regcache->tdesc, n));
	407	}
	408
	409	#ifndef IN_PROCESS_AGENT
	410
	411	void
	412	collect_register_as_string (struct regcache regcache, int n, char buf)
	413	{
	414	bin2hex (register_data (regcache, n, 1), buf,
	415	register_size (regcache->tdesc, n));
	416	}
	417
	418	void
	419	collect_register_by_name (struct regcache *regcache,
	420	const char name, void buf)
	421	{
	422	collect_register (regcache, find_regno (regcache->tdesc, name), buf);
	423	}
	424
	425	/* Special handling for register PC. */
	426
	427	CORE_ADDR
	428	regcache_read_pc (struct regcache *regcache)
	429	{
	430	CORE_ADDR pc_val;
	431
	432	if (the_target->read_pc)
	433	pc_val = the_target->read_pc (regcache);
	434	else
	435	internal_error (__FILE__, __LINE__,
	436	"regcache_read_pc: Unable to find PC");
	437
	438	return pc_val;
	439	}
	440
	441	void
	442	regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
	443	{
	444	if (the_target->write_pc)
	445	the_target->write_pc (regcache, pc);
	446	else
	447	internal_error (__FILE__, __LINE__,
	448	"regcache_write_pc: Unable to update PC");
	449	}
	450
	451	#endif