[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 <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 "nat/gdb_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"

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 = ptid_get_lwp (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 = ptid_get_lwp (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 = ptid_get_lwp (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 = ptid_get_lwp (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"
94a0e877 MG	26	#include "linux-nat.h"
94a0e877	27	#include <sys/types.h>
94a0e877 MG	28	#include <signal.h>
	29	#include <sys/user.h>
	30	#include <sys/ioctl.h>
	31	#include "gdb_wait.h"
	32	#include <fcntl.h>
	33	#include <sys/procfs.h>
5826e159	34	#include "nat/gdb_ptrace.h"
e671835b	35	#include <asm/ptrace.h>
94a0e877 MG	36
	37	#include "gregset.h"
	38	#include "xtensa-tdep.h"
	39
	40	/* Extended register set depends on hardware configs.
	41	Keeping these definitions separately allows to introduce
	42	hardware-specific overlays. */
	43	#include "xtensa-xtregs.c"
	44
94a0e877 MG	45	void
	46	fill_gregset (const struct regcache *regcache,
	47	gdb_gregset_t *gregsetp, int regnum)
	48	{
	49	int i;
	50	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	51	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	52
	53	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	54	regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	55	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	56	regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	57
	58	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	59	regcache_raw_collect (regcache,
	60	gdbarch_tdep (gdbarch)->wb_regnum,
	61	&regs->windowbase);
	62	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	63	regcache_raw_collect (regcache,
	64	gdbarch_tdep (gdbarch)->ws_regnum,
	65	&regs->windowstart);
	66	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	67	regcache_raw_collect (regcache,
	68	gdbarch_tdep (gdbarch)->lbeg_regnum,
	69	&regs->lbeg);
	70	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	71	regcache_raw_collect (regcache,
	72	gdbarch_tdep (gdbarch)->lend_regnum,
	73	&regs->lend);
	74	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	75	regcache_raw_collect (regcache,
	76	gdbarch_tdep (gdbarch)->lcount_regnum,
	77	&regs->lcount);
	78	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	79	regcache_raw_collect (regcache,
	80	gdbarch_tdep (gdbarch)->sar_regnum,
	81	&regs->sar);
	82	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	83	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	84	+ gdbarch_tdep (gdbarch)->num_aregs)
	85	regcache_raw_collect (regcache,regnum,
	86	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	87	else if (regnum == -1)
	88	{
	89	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	90	regcache_raw_collect (regcache,
	91	gdbarch_tdep (gdbarch)->ar_base + i,
	92	&regs->ar[i]);
	93	}
	94	}
	95
	96	void
	97	supply_gregset_reg (struct regcache *regcache,
	98	const gdb_gregset_t *gregsetp, int regnum)
	99	{
	100	int i;
	101	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	102
	103	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	104
	105	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	106	regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	107	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	108	regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
109
110	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
111	regcache_raw_supply (regcache,
112	gdbarch_tdep (gdbarch)->wb_regnum,
113	&regs->windowbase);
114	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
115	regcache_raw_supply (regcache,
116	gdbarch_tdep (gdbarch)->ws_regnum,
117	&regs->windowstart);
118	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
119	regcache_raw_supply (regcache,
120	gdbarch_tdep (gdbarch)->lbeg_regnum,
121	&regs->lbeg);
122	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
123	regcache_raw_supply (regcache,
124	gdbarch_tdep (gdbarch)->lend_regnum,
125	&regs->lend);
126	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
127	regcache_raw_supply (regcache,
128	gdbarch_tdep (gdbarch)->lcount_regnum,
129	&regs->lcount);
130	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
131	regcache_raw_supply (regcache,
132	gdbarch_tdep (gdbarch)->sar_regnum,
133	&regs->sar);
134	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
135	&& regnum < gdbarch_tdep (gdbarch)->ar_base
136	+ gdbarch_tdep (gdbarch)->num_aregs)
137	regcache_raw_supply (regcache,regnum,
138	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
139	else if (regnum == -1)
140	{
141	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
142	regcache_raw_supply (regcache,
143	gdbarch_tdep (gdbarch)->ar_base + i,
144	&regs->ar[i]);
145	}
146	}
147
148	void
149	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
150	{
151	supply_gregset_reg (regcache, gregsetp, -1);
152	}
153
154	void
155	fill_fpregset (const struct regcache *regcache,
156	gdb_fpregset_t *fpregsetp, int regnum)
157	{
158	return;
159	}
160
161	void
162	supply_fpregset (struct regcache *regcache,
163	const gdb_fpregset_t *fpregsetp)
164	{
165	return;
166	}
167
168	/* Fetch greg-register(s) from process/thread TID
169	and store value(s) in GDB's register array. */
170
171	static void
172	fetch_gregs (struct regcache *regcache, int regnum)
173	{
d89fa914	174	int tid = ptid_get_lwp (inferior_ptid);
94a0e877 MG	175	const gdb_gregset_t regs;
	176	int areg;
	177
	178	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	179	{
	180	perror_with_name (_("Couldn't get registers"));
	181	return;
	182	}
	183
	184	supply_gregset_reg (regcache, &regs, regnum);
	185	}
	186
	187	/* Store greg-register(s) in GDB's register
	188	array into the process/thread specified by TID. */
	189
	190	static void
	191	store_gregs (struct regcache *regcache, int regnum)
	192	{
d89fa914	193	int tid = ptid_get_lwp (inferior_ptid);
94a0e877 MG	194	gdb_gregset_t regs;
	195	int areg;
	196
	197	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	198	{
	199	perror_with_name (_("Couldn't get registers"));
	200	return;
	201	}
	202
	203	fill_gregset (regcache, &regs, regnum);
	204
	205	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
	206	{
	207	perror_with_name (_("Couldn't write registers"));
	208	return;
	209	}
	210	}
	211
	212	static int xtreg_lo;
	213	static int xtreg_high;
	214
	215	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
	216	interface provides special requests for this. */
	217
	218	static void
	219	fetch_xtregs (struct regcache *regcache, int regnum)
	220	{
d89fa914	221	int tid = ptid_get_lwp (inferior_ptid);
94a0e877 MG	222	const xtensa_regtable_t *ptr;
	223	char xtregs [XTENSA_ELF_XTREG_SIZE];
	224
	225	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	226	perror_with_name (_("Couldn't get extended registers"));
	227
	228	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	229	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	230	regcache_raw_supply (regcache, ptr->gdb_regnum,
	231	xtregs + ptr->ptrace_offset);
	232	}
	233
	234	static void
	235	store_xtregs (struct regcache *regcache, int regnum)
	236	{
d89fa914	237	int tid = ptid_get_lwp (inferior_ptid);
94a0e877 MG	238	const xtensa_regtable_t *ptr;
	239	char xtregs [XTENSA_ELF_XTREG_SIZE];
	240
	241	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	242	perror_with_name (_("Couldn't get extended registers"));
	243
	244	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	245	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	246	regcache_raw_collect (regcache, ptr->gdb_regnum,
	247	xtregs + ptr->ptrace_offset);
	248
	249	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
	250	perror_with_name (_("Couldn't write extended registers"));
	251	}
	252
	253	void
28439f5e PA	254	xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	255	struct regcache *regcache, int regnum)
94a0e877 MG	256	{
	257	if (regnum == -1)
	258	{
	259	fetch_gregs (regcache, regnum);
	260	fetch_xtregs (regcache, regnum);
	261	}
	262	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	263	fetch_gregs (regcache, regnum);
	264	else
	265	fetch_xtregs (regcache, regnum);
	266	}
	267
	268	void
28439f5e PA	269	xtensa_linux_store_inferior_registers (struct target_ops *ops,
28439f5e PA	270	struct regcache *regcache, int regnum)
94a0e877 MG	271	{
	272	if (regnum == -1)
	273	{
	274	store_gregs (regcache, regnum);
	275	store_xtregs (regcache, regnum);
	276	}
	277	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	278	store_gregs (regcache, regnum);
	279	else
	280	store_xtregs (regcache, regnum);
	281	}
	282
	283	void _initialize_xtensa_linux_nat (void);
	284
	285	void
	286	_initialize_xtensa_linux_nat (void)
	287	{
	288	struct target_ops *t;
	289	const xtensa_regtable_t *ptr;
	290
	291	/* Calculate the number range for extended registers. */
	292	xtreg_lo = 1000000000;
	293	xtreg_high = -1;
	294	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	295	{
	296	if (ptr->gdb_regnum < xtreg_lo)
	297	xtreg_lo = ptr->gdb_regnum;
	298	if (ptr->gdb_regnum > xtreg_high)
	299	xtreg_high = ptr->gdb_regnum;
	300	}
	301
	302	/* Fill in the generic GNU/Linux methods. */
	303	t = linux_target ();
	304
	305	/* Add our register access methods. */
	306	t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
	307	t->to_store_registers = xtensa_linux_store_inferior_registers;
	308
	309	linux_nat_add_target (t);
	310	}