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

/* Xtensa GNU/Linux native support.

   Copyright (C) 2007-2017 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"

/* Defines ps_err_e, struct ps_prochandle.  */
#include "gdb_proc_service.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]);
    }
}

static 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 (regcache_get_ptid (regcache));
  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 (regcache_get_ptid (regcache));
  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 (regcache_get_ptid (regcache));
  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 (regcache_get_ptid (regcache));
  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"));
}

static 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);
}

static 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);
}

/* Called by libthread_db.  */

ps_err_e
ps_get_thread_area (struct ps_prochandle *ph,
                    lwpid_t lwpid, int idx, void **base)
{
  xtensa_elf_gregset_t regs;

  if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
    return PS_ERR;

  /* IDX is the bias from the thread pointer to the beginning of the
     thread descriptor.  It has to be subtracted due to implementation
     quirks in libthread_db.  */
  *base = (void *) ((char *) regs.threadptr - idx);

  return PS_OK;
}

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
61baf725	3	Copyright (C) 2007-2017 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
40045d91 MF	40	/* Defines ps_err_e, struct ps_prochandle. */
	41	#include "gdb_proc_service.h"
	42
94a0e877 MG	43	/* Extended register set depends on hardware configs.
	44	Keeping these definitions separately allows to introduce
	45	hardware-specific overlays. */
	46	#include "xtensa-xtregs.c"
	47
94a0e877 MG	48	void
	49	fill_gregset (const struct regcache *regcache,
	50	gdb_gregset_t *gregsetp, int regnum)
	51	{
	52	int i;
	53	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	54	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	55
	56	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	57	regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	58	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	59	regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	60
	61	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	62	regcache_raw_collect (regcache,
	63	gdbarch_tdep (gdbarch)->wb_regnum,
	64	&regs->windowbase);
	65	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	66	regcache_raw_collect (regcache,
	67	gdbarch_tdep (gdbarch)->ws_regnum,
	68	&regs->windowstart);
	69	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	70	regcache_raw_collect (regcache,
	71	gdbarch_tdep (gdbarch)->lbeg_regnum,
	72	&regs->lbeg);
	73	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	74	regcache_raw_collect (regcache,
	75	gdbarch_tdep (gdbarch)->lend_regnum,
	76	&regs->lend);
	77	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	78	regcache_raw_collect (regcache,
	79	gdbarch_tdep (gdbarch)->lcount_regnum,
	80	&regs->lcount);
	81	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	82	regcache_raw_collect (regcache,
	83	gdbarch_tdep (gdbarch)->sar_regnum,
	84	&regs->sar);
	85	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	86	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	87	+ gdbarch_tdep (gdbarch)->num_aregs)
	88	regcache_raw_collect (regcache,regnum,
	89	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	90	else if (regnum == -1)
	91	{
	92	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	93	regcache_raw_collect (regcache,
	94	gdbarch_tdep (gdbarch)->ar_base + i,
	95	&regs->ar[i]);
	96	}
	97	}
	98
1c215b97	99	static void
94a0e877 MG	100	supply_gregset_reg (struct regcache *regcache,
	101	const gdb_gregset_t *gregsetp, int regnum)
	102	{
	103	int i;
	104	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	105
	106	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	107
	108	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	109	regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	110	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	111	regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	112
	113	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	114	regcache_raw_supply (regcache,
	115	gdbarch_tdep (gdbarch)->wb_regnum,
	116	&regs->windowbase);
	117	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	118	regcache_raw_supply (regcache,
	119	gdbarch_tdep (gdbarch)->ws_regnum,
	120	&regs->windowstart);
	121	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	122	regcache_raw_supply (regcache,
	123	gdbarch_tdep (gdbarch)->lbeg_regnum,
	124	&regs->lbeg);
	125	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	126	regcache_raw_supply (regcache,
	127	gdbarch_tdep (gdbarch)->lend_regnum,
	128	&regs->lend);
	129	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	130	regcache_raw_supply (regcache,
	131	gdbarch_tdep (gdbarch)->lcount_regnum,
	132	&regs->lcount);
	133	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	134	regcache_raw_supply (regcache,
	135	gdbarch_tdep (gdbarch)->sar_regnum,
	136	&regs->sar);
	137	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	138	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	139	+ gdbarch_tdep (gdbarch)->num_aregs)
	140	regcache_raw_supply (regcache,regnum,
	141	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	142	else if (regnum == -1)
	143	{
	144	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	145	regcache_raw_supply (regcache,
	146	gdbarch_tdep (gdbarch)->ar_base + i,
	147	&regs->ar[i]);
	148	}
	149	}
	150
	151	void
	152	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
	153	{
	154	supply_gregset_reg (regcache, gregsetp, -1);
	155	}
	156
	157	void
	158	fill_fpregset (const struct regcache *regcache,
	159	gdb_fpregset_t *fpregsetp, int regnum)
	160	{
	161	return;
	162	}
	163
164	void
165	supply_fpregset (struct regcache *regcache,
166	const gdb_fpregset_t *fpregsetp)
167	{
168	return;
169	}
170
171	/* Fetch greg-register(s) from process/thread TID
172	and store value(s) in GDB's register array. */
173
174	static void
175	fetch_gregs (struct regcache *regcache, int regnum)
176	{
bcc0c096	177	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
d274ecf4	178	gdb_gregset_t regs;
94a0e877 MG	179	int areg;
	180
	181	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	182	{
	183	perror_with_name (_("Couldn't get registers"));
	184	return;
	185	}
	186
	187	supply_gregset_reg (regcache, &regs, regnum);
	188	}
	189
	190	/* Store greg-register(s) in GDB's register
	191	array into the process/thread specified by TID. */
	192
	193	static void
	194	store_gregs (struct regcache *regcache, int regnum)
	195	{
bcc0c096	196	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	197	gdb_gregset_t regs;
	198	int areg;
	199
	200	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	201	{
	202	perror_with_name (_("Couldn't get registers"));
	203	return;
	204	}
	205
	206	fill_gregset (regcache, &regs, regnum);
	207
	208	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
	209	{
	210	perror_with_name (_("Couldn't write registers"));
	211	return;
	212	}
	213	}
	214
	215	static int xtreg_lo;
	216	static int xtreg_high;
	217
	218	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
	219	interface provides special requests for this. */
	220
	221	static void
	222	fetch_xtregs (struct regcache *regcache, int regnum)
	223	{
bcc0c096	224	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	225	const xtensa_regtable_t *ptr;
	226	char xtregs [XTENSA_ELF_XTREG_SIZE];
	227
	228	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	229	perror_with_name (_("Couldn't get extended registers"));
	230
	231	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	232	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	233	regcache_raw_supply (regcache, ptr->gdb_regnum,
	234	xtregs + ptr->ptrace_offset);
	235	}
	236
	237	static void
	238	store_xtregs (struct regcache *regcache, int regnum)
	239	{
bcc0c096	240	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	241	const xtensa_regtable_t *ptr;
	242	char xtregs [XTENSA_ELF_XTREG_SIZE];
	243
	244	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	245	perror_with_name (_("Couldn't get extended registers"));
	246
	247	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	248	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	249	regcache_raw_collect (regcache, ptr->gdb_regnum,
	250	xtregs + ptr->ptrace_offset);
	251
	252	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
	253	perror_with_name (_("Couldn't write extended registers"));
	254	}
	255
1c215b97	256	static void
28439f5e PA	257	xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	258	struct regcache *regcache, int regnum)
94a0e877 MG	259	{
	260	if (regnum == -1)
	261	{
	262	fetch_gregs (regcache, regnum);
	263	fetch_xtregs (regcache, regnum);
	264	}
	265	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	266	fetch_gregs (regcache, regnum);
	267	else
	268	fetch_xtregs (regcache, regnum);
	269	}
	270
1c215b97	271	static void
28439f5e PA	272	xtensa_linux_store_inferior_registers (struct target_ops *ops,
28439f5e PA	273	struct regcache *regcache, int regnum)
94a0e877 MG	274	{
	275	if (regnum == -1)
	276	{
	277	store_gregs (regcache, regnum);
	278	store_xtregs (regcache, regnum);
	279	}
	280	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	281	store_gregs (regcache, regnum);
	282	else
	283	store_xtregs (regcache, regnum);
	284	}
	285
40045d91 MF	286	/* Called by libthread_db. */
	287
	288	ps_err_e
754653a7	289	ps_get_thread_area (struct ps_prochandle *ph,
40045d91 MF	290	lwpid_t lwpid, int idx, void **base)
	291	{
	292	xtensa_elf_gregset_t regs;
	293
	294	if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
	295	return PS_ERR;
	296
	297	/* IDX is the bias from the thread pointer to the beginning of the
	298	thread descriptor. It has to be subtracted due to implementation
	299	quirks in libthread_db. */
	300	base = (void ) ((char *) regs.threadptr - idx);
	301
	302	return PS_OK;
	303	}
	304
94a0e877 MG	305	void _initialize_xtensa_linux_nat (void);
	306
	307	void
	308	_initialize_xtensa_linux_nat (void)
	309	{
	310	struct target_ops *t;
	311	const xtensa_regtable_t *ptr;
	312
	313	/* Calculate the number range for extended registers. */
	314	xtreg_lo = 1000000000;
	315	xtreg_high = -1;
	316	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	317	{
	318	if (ptr->gdb_regnum < xtreg_lo)
	319	xtreg_lo = ptr->gdb_regnum;
	320	if (ptr->gdb_regnum > xtreg_high)
	321	xtreg_high = ptr->gdb_regnum;
	322	}
	323
	324	/* Fill in the generic GNU/Linux methods. */
	325	t = linux_target ();
	326
	327	/* Add our register access methods. */
	328	t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
	329	t->to_store_registers = xtensa_linux_store_inferior_registers;
	330
	331	linux_nat_add_target (t);
	332	}