[deliverable/binutils-gdb.git] / gdb / xtensa-linux-nat.c

/* Xtensa GNU/Linux native support.

   Copyright (C) 2007-2015 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 "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
#include "target.h"
#include "linux-nat.h"

#include <stdint.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include "gdb_wait.h"
#include <fcntl.h>
#include <sys/procfs.h>
#include <sys/ptrace.h>
#include <asm/ptrace.h>

#include "gregset.h"
#include "xtensa-tdep.h"

/* Extended register set depends on hardware configs.
   Keeping these definitions separately allows to introduce
   hardware-specific overlays.  */
#include "xtensa-xtregs.c"

static int
get_thread_id (ptid_t ptid)
{
  int tid = ptid_get_lwp (ptid);
  if (0 == tid)
    tid = ptid_get_pid (ptid);
  return tid;
}
#define GET_THREAD_ID(PTID)	get_thread_id (PTID)

void
fill_gregset (const struct regcache *regcache,
	      gdb_gregset_t *gregsetp, int regnum)
{
  int i;
  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
    regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
    regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->wb_regnum,
			  &regs->windowbase);
  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->ws_regnum,
			  &regs->windowstart);
  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->lbeg_regnum,
			  &regs->lbeg);
  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->lend_regnum,
			  &regs->lend);
  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->lcount_regnum,
			  &regs->lcount);
  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->sar_regnum,
			  &regs->sar);
  if (regnum >=gdbarch_tdep (gdbarch)->ar_base
      && regnum < gdbarch_tdep (gdbarch)->ar_base
		    + gdbarch_tdep (gdbarch)->num_aregs)
    regcache_raw_collect (regcache,regnum,
			  &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
  else if (regnum == -1)
    {
      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	regcache_raw_collect (regcache,
			      gdbarch_tdep (gdbarch)->ar_base + i,
			      &regs->ar[i]);
    }
}

void
supply_gregset_reg (struct regcache *regcache,
		    const gdb_gregset_t *gregsetp, int regnum)
{
  int i;
  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
    regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
    regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->wb_regnum,
			  &regs->windowbase);
  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->ws_regnum,
			  &regs->windowstart);
  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->lbeg_regnum,
			  &regs->lbeg);
  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->lend_regnum,
			  &regs->lend);
  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->lcount_regnum,
			  &regs->lcount);
  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->sar_regnum,
			  &regs->sar);
  if (regnum >=gdbarch_tdep (gdbarch)->ar_base
      && regnum < gdbarch_tdep (gdbarch)->ar_base
		    + gdbarch_tdep (gdbarch)->num_aregs)
    regcache_raw_supply (regcache,regnum,
			  &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
  else if (regnum == -1)
    {
      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	regcache_raw_supply (regcache,
			      gdbarch_tdep (gdbarch)->ar_base + i,
			      &regs->ar[i]);
    }
}

void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
  supply_gregset_reg (regcache, gregsetp, -1);
}

void
fill_fpregset (const struct regcache *regcache,
	       gdb_fpregset_t *fpregsetp, int regnum)
{
  return;
}

void 
supply_fpregset (struct regcache *regcache,
		 const gdb_fpregset_t *fpregsetp)
{
  return;
}

/* Fetch greg-register(s) from process/thread TID
   and store value(s) in GDB's register array.  */

static void
fetch_gregs (struct regcache *regcache, int regnum)
{
  int tid = GET_THREAD_ID (inferior_ptid);
  const gdb_gregset_t regs;
  int areg;
  
  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
    {
      perror_with_name (_("Couldn't get registers"));
      return;
    }
 
  supply_gregset_reg (regcache, &regs, regnum);
}

/* Store greg-register(s) in GDB's register 
   array into the process/thread specified by TID.  */

static void
store_gregs (struct regcache *regcache, int regnum)
{
  int tid = GET_THREAD_ID (inferior_ptid);
  gdb_gregset_t regs;
  int areg;

  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
    {
      perror_with_name (_("Couldn't get registers"));
      return;
    }

  fill_gregset (regcache, &regs, regnum);

  if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
    {
      perror_with_name (_("Couldn't write registers"));
      return;
    }
}

static int xtreg_lo;
static int xtreg_high;

/* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
   interface provides special requests for this.  */

static void
fetch_xtregs (struct regcache *regcache, int regnum)
{
  int tid = GET_THREAD_ID (inferior_ptid);
  const xtensa_regtable_t *ptr;
  char xtregs [XTENSA_ELF_XTREG_SIZE];

  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
    perror_with_name (_("Couldn't get extended registers"));

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
    if (regnum == ptr->gdb_regnum || regnum == -1)
      regcache_raw_supply (regcache, ptr->gdb_regnum,
			   xtregs + ptr->ptrace_offset);
}

static void
store_xtregs (struct regcache *regcache, int regnum)
{
  int tid = GET_THREAD_ID (inferior_ptid);
  const xtensa_regtable_t *ptr;
  char xtregs [XTENSA_ELF_XTREG_SIZE];

  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
    perror_with_name (_("Couldn't get extended registers"));

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
    if (regnum == ptr->gdb_regnum || regnum == -1)
      regcache_raw_collect (regcache, ptr->gdb_regnum,
			    xtregs + ptr->ptrace_offset);

  if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
    perror_with_name (_("Couldn't write extended registers"));
}

void
xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
				       struct regcache *regcache, int regnum)
{
  if (regnum == -1)
    {
      fetch_gregs (regcache, regnum);
      fetch_xtregs (regcache, regnum);
    }
  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
    fetch_gregs (regcache, regnum);
  else
    fetch_xtregs (regcache, regnum);
}

void
xtensa_linux_store_inferior_registers (struct target_ops *ops,
				       struct regcache *regcache, int regnum)
{
  if (regnum == -1)
    {
      store_gregs (regcache, regnum);
      store_xtregs (regcache, regnum);
    }
  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
    store_gregs (regcache, regnum);
  else
    store_xtregs (regcache, regnum);
}

void _initialize_xtensa_linux_nat (void);

void
_initialize_xtensa_linux_nat (void)
{
  struct target_ops *t;
  const xtensa_regtable_t *ptr;

  /* Calculate the number range for extended registers.  */
  xtreg_lo = 1000000000;
  xtreg_high = -1;
  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
    {
      if (ptr->gdb_regnum < xtreg_lo)
	xtreg_lo = ptr->gdb_regnum;
      if (ptr->gdb_regnum > xtreg_high)
	xtreg_high = ptr->gdb_regnum;
    }

  /* Fill in the generic GNU/Linux methods.  */
  t = linux_target ();

  /* Add our register access methods.  */
  t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
  t->to_store_registers = xtensa_linux_store_inferior_registers;

  linux_nat_add_target (t);
}
Commit	Line	Data
94a0e877 MG	1	/* Xtensa GNU/Linux native support.
94a0e877 MG	2
32d0add0	3	Copyright (C) 2007-2015 Free Software Foundation, Inc.
94a0e877 MG	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
94a0e877 MG	21	#include "frame.h"
	22	#include "inferior.h"
	23	#include "gdbcore.h"
	24	#include "regcache.h"
94a0e877 MG	25	#include "target.h"
	26	#include "linux-nat.h"
	27
	28	#include <stdint.h>
	29	#include <sys/types.h>
94a0e877 MG	30	#include <signal.h>
	31	#include <sys/user.h>
	32	#include <sys/ioctl.h>
	33	#include "gdb_wait.h"
	34	#include <fcntl.h>
	35	#include <sys/procfs.h>
	36	#include <sys/ptrace.h>
e671835b	37	#include <asm/ptrace.h>
94a0e877 MG	38
	39	#include "gregset.h"
	40	#include "xtensa-tdep.h"
	41
	42	/* Extended register set depends on hardware configs.
	43	Keeping these definitions separately allows to introduce
	44	hardware-specific overlays. */
	45	#include "xtensa-xtregs.c"
	46
4e841acf	47	static int
94a0e877 MG	48	get_thread_id (ptid_t ptid)
94a0e877 MG	49	{
dfd4cc63	50	int tid = ptid_get_lwp (ptid);
94a0e877	51	if (0 == tid)
dfd4cc63	52	tid = ptid_get_pid (ptid);
94a0e877 MG	53	return tid;
	54	}
	55	#define GET_THREAD_ID(PTID) get_thread_id (PTID)
	56
	57	void
	58	fill_gregset (const struct regcache *regcache,
	59	gdb_gregset_t *gregsetp, int regnum)
	60	{
	61	int i;
	62	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	63	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	64
	65	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	66	regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	67	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	68	regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	69
	70	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	71	regcache_raw_collect (regcache,
	72	gdbarch_tdep (gdbarch)->wb_regnum,
	73	&regs->windowbase);
	74	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	75	regcache_raw_collect (regcache,
	76	gdbarch_tdep (gdbarch)->ws_regnum,
	77	&regs->windowstart);
	78	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	79	regcache_raw_collect (regcache,
	80	gdbarch_tdep (gdbarch)->lbeg_regnum,
	81	&regs->lbeg);
	82	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	83	regcache_raw_collect (regcache,
	84	gdbarch_tdep (gdbarch)->lend_regnum,
	85	&regs->lend);
	86	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	87	regcache_raw_collect (regcache,
	88	gdbarch_tdep (gdbarch)->lcount_regnum,
	89	&regs->lcount);
	90	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	91	regcache_raw_collect (regcache,
	92	gdbarch_tdep (gdbarch)->sar_regnum,
	93	&regs->sar);
	94	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	95	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	96	+ gdbarch_tdep (gdbarch)->num_aregs)
	97	regcache_raw_collect (regcache,regnum,
	98	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	99	else if (regnum == -1)
	100	{
	101	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	102	regcache_raw_collect (regcache,
	103	gdbarch_tdep (gdbarch)->ar_base + i,
	104	&regs->ar[i]);
	105	}
	106	}
	107
	108	void
	109	supply_gregset_reg (struct regcache *regcache,
	110	const gdb_gregset_t *gregsetp, int regnum)
	111	{
	112	int i;
	113	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	114
	115	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	116
117	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
118	regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
119	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
120	regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
121
122	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
123	regcache_raw_supply (regcache,
124	gdbarch_tdep (gdbarch)->wb_regnum,
125	&regs->windowbase);
126	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
127	regcache_raw_supply (regcache,
128	gdbarch_tdep (gdbarch)->ws_regnum,
129	&regs->windowstart);
130	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
131	regcache_raw_supply (regcache,
132	gdbarch_tdep (gdbarch)->lbeg_regnum,
133	&regs->lbeg);
134	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
135	regcache_raw_supply (regcache,
136	gdbarch_tdep (gdbarch)->lend_regnum,
137	&regs->lend);
138	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
139	regcache_raw_supply (regcache,
140	gdbarch_tdep (gdbarch)->lcount_regnum,
141	&regs->lcount);
142	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
143	regcache_raw_supply (regcache,
144	gdbarch_tdep (gdbarch)->sar_regnum,
145	&regs->sar);
146	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
147	&& regnum < gdbarch_tdep (gdbarch)->ar_base
148	+ gdbarch_tdep (gdbarch)->num_aregs)
149	regcache_raw_supply (regcache,regnum,
150	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
151	else if (regnum == -1)
152	{
153	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
154	regcache_raw_supply (regcache,
155	gdbarch_tdep (gdbarch)->ar_base + i,
156	&regs->ar[i]);
157	}
158	}
159
160	void
161	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
162	{
163	supply_gregset_reg (regcache, gregsetp, -1);
164	}
165
166	void
167	fill_fpregset (const struct regcache *regcache,
168	gdb_fpregset_t *fpregsetp, int regnum)
169	{
170	return;
171	}
172
173	void
174	supply_fpregset (struct regcache *regcache,
175	const gdb_fpregset_t *fpregsetp)
176	{
177	return;
178	}
179
180	/* Fetch greg-register(s) from process/thread TID
181	and store value(s) in GDB's register array. */
182
183	static void
184	fetch_gregs (struct regcache *regcache, int regnum)
185	{
186	int tid = GET_THREAD_ID (inferior_ptid);
187	const gdb_gregset_t regs;
188	int areg;
189
190	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
191	{
192	perror_with_name (_("Couldn't get registers"));
193	return;
194	}
195
196	supply_gregset_reg (regcache, &regs, regnum);
197	}
198
199	/* Store greg-register(s) in GDB's register
200	array into the process/thread specified by TID. */
201
202	static void
203	store_gregs (struct regcache *regcache, int regnum)
204	{
205	int tid = GET_THREAD_ID (inferior_ptid);
206	gdb_gregset_t regs;
207	int areg;
208
209	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
210	{
211	perror_with_name (_("Couldn't get registers"));
212	return;
213	}
214
215	fill_gregset (regcache, &regs, regnum);
216
217	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
218	{
219	perror_with_name (_("Couldn't write registers"));
220	return;
221	}
222	}
223
224	static int xtreg_lo;
225	static int xtreg_high;
226
227	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
228	interface provides special requests for this. */
229
230	static void
231	fetch_xtregs (struct regcache *regcache, int regnum)
232	{
233	int tid = GET_THREAD_ID (inferior_ptid);
234	const xtensa_regtable_t *ptr;
235	char xtregs [XTENSA_ELF_XTREG_SIZE];
236
237	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
238	perror_with_name (_("Couldn't get extended registers"));
239
240	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
241	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
242	regcache_raw_supply (regcache, ptr->gdb_regnum,
243	xtregs + ptr->ptrace_offset);
244	}
245
246	static void
247	store_xtregs (struct regcache *regcache, int regnum)
248	{
249	int tid = GET_THREAD_ID (inferior_ptid);
250	const xtensa_regtable_t *ptr;
251	char xtregs [XTENSA_ELF_XTREG_SIZE];
252
253	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
254	perror_with_name (_("Couldn't get extended registers"));
255
256	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
257	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
258	regcache_raw_collect (regcache, ptr->gdb_regnum,
259	xtregs + ptr->ptrace_offset);
260
261	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
262	perror_with_name (_("Couldn't write extended registers"));
263	}
264
265	void
28439f5e PA	266	xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	267	struct regcache *regcache, int regnum)
94a0e877 MG	268	{
	269	if (regnum == -1)
	270	{
	271	fetch_gregs (regcache, regnum);
	272	fetch_xtregs (regcache, regnum);
	273	}
	274	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	275	fetch_gregs (regcache, regnum);
	276	else
	277	fetch_xtregs (regcache, regnum);
	278	}
	279
	280	void
28439f5e PA	281	xtensa_linux_store_inferior_registers (struct target_ops *ops,
28439f5e PA	282	struct regcache *regcache, int regnum)
94a0e877 MG	283	{
	284	if (regnum == -1)
	285	{
	286	store_gregs (regcache, regnum);
	287	store_xtregs (regcache, regnum);
	288	}
	289	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	290	store_gregs (regcache, regnum);
	291	else
	292	store_xtregs (regcache, regnum);
	293	}
	294
	295	void _initialize_xtensa_linux_nat (void);
	296
	297	void
	298	_initialize_xtensa_linux_nat (void)
	299	{
	300	struct target_ops *t;
	301	const xtensa_regtable_t *ptr;
	302
	303	/* Calculate the number range for extended registers. */
	304	xtreg_lo = 1000000000;
	305	xtreg_high = -1;
	306	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	307	{
	308	if (ptr->gdb_regnum < xtreg_lo)
	309	xtreg_lo = ptr->gdb_regnum;
	310	if (ptr->gdb_regnum > xtreg_high)
	311	xtreg_high = ptr->gdb_regnum;
	312	}
	313
	314	/* Fill in the generic GNU/Linux methods. */
	315	t = linux_target ();
	316
	317	/* Add our register access methods. */
	318	t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
	319	t->to_store_registers = xtensa_linux_store_inferior_registers;
	320
	321	linux_nat_add_target (t);
	322	}