[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)->threadptr_regnum || regnum == -1)
    regcache_raw_collect (regcache,
			  gdbarch_tdep (gdbarch)->threadptr_regnum,
			  &regs->threadptr);
  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]);
    }
  if (regnum >= gdbarch_tdep (gdbarch)->a0_base
      && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
    regcache_raw_collect (regcache, regnum,
			  &regs->ar[(4 * regs->windowbase + regnum
				     - gdbarch_tdep (gdbarch)->a0_base)
			  % gdbarch_tdep (gdbarch)->num_aregs]);
  else if (regnum == -1)
    {
      for (i = 0; i < C0_NREGS; ++i)
	regcache_raw_collect (regcache,
			      gdbarch_tdep (gdbarch)->a0_base + i,
			      &regs->ar[(4 * regs->windowbase + i)
			      % gdbarch_tdep (gdbarch)->num_aregs]);
    }
}

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)->threadptr_regnum || regnum == -1)
    regcache_raw_supply (regcache,
			  gdbarch_tdep (gdbarch)->threadptr_regnum,
			  &regs->threadptr);
  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]);
    }
  if (regnum >= gdbarch_tdep (gdbarch)->a0_base
      && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
    regcache_raw_supply (regcache, regnum,
			 &regs->ar[(4 * regs->windowbase + regnum
				    - gdbarch_tdep (gdbarch)->a0_base)
			 % gdbarch_tdep (gdbarch)->num_aregs]);
  else if (regnum == -1)
    {
      for (i = 0; i < C0_NREGS; ++i)
	regcache_raw_supply (regcache,
			     gdbarch_tdep (gdbarch)->a0_base + i,
			     &regs->ar[(4 * regs->windowbase + i)
			     % gdbarch_tdep (gdbarch)->num_aregs]);
    }
}

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);
f74f865e MF	85	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
	86	regcache_raw_collect (regcache,
	87	gdbarch_tdep (gdbarch)->threadptr_regnum,
	88	&regs->threadptr);
94a0e877 MG	89	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	90	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	91	+ gdbarch_tdep (gdbarch)->num_aregs)
	92	regcache_raw_collect (regcache,regnum,
	93	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	94	else if (regnum == -1)
	95	{
	96	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	97	regcache_raw_collect (regcache,
	98	gdbarch_tdep (gdbarch)->ar_base + i,
	99	&regs->ar[i]);
	100	}
0ce4291e MF	101	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
	102	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
	103	regcache_raw_collect (regcache, regnum,
	104	&regs->ar[(4 * regs->windowbase + regnum
	105	- gdbarch_tdep (gdbarch)->a0_base)
	106	% gdbarch_tdep (gdbarch)->num_aregs]);
	107	else if (regnum == -1)
	108	{
	109	for (i = 0; i < C0_NREGS; ++i)
	110	regcache_raw_collect (regcache,
	111	gdbarch_tdep (gdbarch)->a0_base + i,
	112	&regs->ar[(4 * regs->windowbase + i)
	113	% gdbarch_tdep (gdbarch)->num_aregs]);
	114	}
94a0e877 MG	115	}
94a0e877 MG	116
1c215b97	117	static void
94a0e877 MG	118	supply_gregset_reg (struct regcache *regcache,
	119	const gdb_gregset_t *gregsetp, int regnum)
	120	{
	121	int i;
	122	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	123
	124	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	125
	126	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	127	regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	128	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	129	regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	130
	131	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	132	regcache_raw_supply (regcache,
	133	gdbarch_tdep (gdbarch)->wb_regnum,
	134	&regs->windowbase);
	135	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	136	regcache_raw_supply (regcache,
	137	gdbarch_tdep (gdbarch)->ws_regnum,
	138	&regs->windowstart);
	139	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	140	regcache_raw_supply (regcache,
	141	gdbarch_tdep (gdbarch)->lbeg_regnum,
	142	&regs->lbeg);
	143	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	144	regcache_raw_supply (regcache,
	145	gdbarch_tdep (gdbarch)->lend_regnum,
	146	&regs->lend);
	147	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	148	regcache_raw_supply (regcache,
	149	gdbarch_tdep (gdbarch)->lcount_regnum,
	150	&regs->lcount);
	151	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	152	regcache_raw_supply (regcache,
	153	gdbarch_tdep (gdbarch)->sar_regnum,
	154	&regs->sar);
f74f865e MF	155	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
	156	regcache_raw_supply (regcache,
	157	gdbarch_tdep (gdbarch)->threadptr_regnum,
	158	&regs->threadptr);
94a0e877 MG	159	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	160	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	161	+ gdbarch_tdep (gdbarch)->num_aregs)
	162	regcache_raw_supply (regcache,regnum,
	163	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	164	else if (regnum == -1)
	165	{
	166	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	167	regcache_raw_supply (regcache,
	168	gdbarch_tdep (gdbarch)->ar_base + i,
	169	&regs->ar[i]);
	170	}
0ce4291e MF	171	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
	172	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
	173	regcache_raw_supply (regcache, regnum,
	174	&regs->ar[(4 * regs->windowbase + regnum
	175	- gdbarch_tdep (gdbarch)->a0_base)
	176	% gdbarch_tdep (gdbarch)->num_aregs]);
	177	else if (regnum == -1)
	178	{
	179	for (i = 0; i < C0_NREGS; ++i)
	180	regcache_raw_supply (regcache,
	181	gdbarch_tdep (gdbarch)->a0_base + i,
	182	&regs->ar[(4 * regs->windowbase + i)
	183	% gdbarch_tdep (gdbarch)->num_aregs]);
	184	}
94a0e877 MG	185	}
	186
	187	void
	188	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
	189	{
	190	supply_gregset_reg (regcache, gregsetp, -1);
	191	}
	192
	193	void
	194	fill_fpregset (const struct regcache *regcache,
	195	gdb_fpregset_t *fpregsetp, int regnum)
	196	{
	197	return;
	198	}
	199
	200	void
	201	supply_fpregset (struct regcache *regcache,
	202	const gdb_fpregset_t *fpregsetp)
	203	{
	204	return;
	205	}
	206
	207	/* Fetch greg-register(s) from process/thread TID
	208	and store value(s) in GDB's register array. */
	209
	210	static void
	211	fetch_gregs (struct regcache *regcache, int regnum)
	212	{
bcc0c096	213	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
d274ecf4	214	gdb_gregset_t regs;
94a0e877 MG	215	int areg;
	216
	217	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	218	{
	219	perror_with_name (_("Couldn't get registers"));
	220	return;
	221	}
	222
	223	supply_gregset_reg (regcache, &regs, regnum);
	224	}
	225
	226	/* Store greg-register(s) in GDB's register
	227	array into the process/thread specified by TID. */
	228
	229	static void
	230	store_gregs (struct regcache *regcache, int regnum)
	231	{
bcc0c096	232	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	233	gdb_gregset_t regs;
	234	int areg;
	235
	236	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	237	{
	238	perror_with_name (_("Couldn't get registers"));
	239	return;
	240	}
	241
	242	fill_gregset (regcache, &regs, regnum);
	243
	244	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
	245	{
	246	perror_with_name (_("Couldn't write registers"));
	247	return;
	248	}
	249	}
	250
	251	static int xtreg_lo;
	252	static int xtreg_high;
	253
	254	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
	255	interface provides special requests for this. */
	256
	257	static void
	258	fetch_xtregs (struct regcache *regcache, int regnum)
	259	{
bcc0c096	260	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	261	const xtensa_regtable_t *ptr;
	262	char xtregs [XTENSA_ELF_XTREG_SIZE];
	263
	264	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	265	perror_with_name (_("Couldn't get extended registers"));
	266
	267	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	268	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	269	regcache_raw_supply (regcache, ptr->gdb_regnum,
	270	xtregs + ptr->ptrace_offset);
	271	}
	272
	273	static void
	274	store_xtregs (struct regcache *regcache, int regnum)
	275	{
bcc0c096	276	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	277	const xtensa_regtable_t *ptr;
	278	char xtregs [XTENSA_ELF_XTREG_SIZE];
	279
	280	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	281	perror_with_name (_("Couldn't get extended registers"));
	282
	283	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	284	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	285	regcache_raw_collect (regcache, ptr->gdb_regnum,
	286	xtregs + ptr->ptrace_offset);
	287
	288	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
	289	perror_with_name (_("Couldn't write extended registers"));
	290	}
	291
1c215b97	292	static void
28439f5e PA	293	xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	294	struct regcache *regcache, int regnum)
94a0e877 MG	295	{
	296	if (regnum == -1)
	297	{
	298	fetch_gregs (regcache, regnum);
	299	fetch_xtregs (regcache, regnum);
	300	}
	301	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	302	fetch_gregs (regcache, regnum);
	303	else
	304	fetch_xtregs (regcache, regnum);
	305	}
	306
1c215b97	307	static void
28439f5e PA	308	xtensa_linux_store_inferior_registers (struct target_ops *ops,
28439f5e PA	309	struct regcache *regcache, int regnum)
94a0e877 MG	310	{
	311	if (regnum == -1)
	312	{
	313	store_gregs (regcache, regnum);
	314	store_xtregs (regcache, regnum);
	315	}
	316	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	317	store_gregs (regcache, regnum);
	318	else
	319	store_xtregs (regcache, regnum);
	320	}
	321
40045d91 MF	322	/* Called by libthread_db. */
	323
	324	ps_err_e
754653a7	325	ps_get_thread_area (struct ps_prochandle *ph,
40045d91 MF	326	lwpid_t lwpid, int idx, void **base)
	327	{
	328	xtensa_elf_gregset_t regs;
	329
	330	if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
	331	return PS_ERR;
	332
	333	/* IDX is the bias from the thread pointer to the beginning of the
	334	thread descriptor. It has to be subtracted due to implementation
	335	quirks in libthread_db. */
	336	base = (void ) ((char *) regs.threadptr - idx);
	337
	338	return PS_OK;
	339	}
	340
94a0e877 MG	341	void _initialize_xtensa_linux_nat (void);
	342
	343	void
	344	_initialize_xtensa_linux_nat (void)
	345	{
	346	struct target_ops *t;
	347	const xtensa_regtable_t *ptr;
	348
	349	/* Calculate the number range for extended registers. */
	350	xtreg_lo = 1000000000;
	351	xtreg_high = -1;
	352	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	353	{
	354	if (ptr->gdb_regnum < xtreg_lo)
	355	xtreg_lo = ptr->gdb_regnum;
	356	if (ptr->gdb_regnum > xtreg_high)
	357	xtreg_high = ptr->gdb_regnum;
	358	}
	359
	360	/* Fill in the generic GNU/Linux methods. */
	361	t = linux_target ();
	362
	363	/* Add our register access methods. */
	364	t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
	365	t->to_store_registers = xtensa_linux_store_inferior_registers;
	366
	367	linux_nat_add_target (t);
	368	}