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

/* Xtensa GNU/Linux native support.

   Copyright (C) 2007-2018 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"

class xtensa_linux_nat_target final : public linux_nat_target
{
public:
  /* Add our register access methods.  */
  void fetch_registers (struct regcache *, int) override;
  void store_registers (struct regcache *, int) override;
};

static xtensa_linux_nat_target the_xtensa_linux_nat_target;

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 = regcache->arch ();

  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 = regcache->arch ();

  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"));
}

void
xtensa_linux_nat_target::fetch_registers (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_nat_target::store_registers (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)
{
  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;
    }

  linux_target = &the_xtensa_linux_nat_target;
  add_inf_child_target (&the_xtensa_linux_nat_target);
}
Commit	Line	Data
94a0e877 MG	1	/* Xtensa GNU/Linux native support.
94a0e877 MG	2
e2882c85	3	Copyright (C) 2007-2018 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
f6ac5f3d PA	48	class xtensa_linux_nat_target final : public linux_nat_target
	49	{
	50	public:
	51	/* Add our register access methods. */
	52	void fetch_registers (struct regcache *, int) override;
	53	void store_registers (struct regcache *, int) override;
	54	};
	55
	56	static xtensa_linux_nat_target the_xtensa_linux_nat_target;
	57
94a0e877 MG	58	void
	59	fill_gregset (const struct regcache *regcache,
	60	gdb_gregset_t *gregsetp, int regnum)
	61	{
	62	int i;
	63	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
ac7936df	64	struct gdbarch *gdbarch = regcache->arch ();
94a0e877 MG	65
	66	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	67	regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	68	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	69	regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	70
	71	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	72	regcache_raw_collect (regcache,
	73	gdbarch_tdep (gdbarch)->wb_regnum,
	74	&regs->windowbase);
	75	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	76	regcache_raw_collect (regcache,
	77	gdbarch_tdep (gdbarch)->ws_regnum,
	78	&regs->windowstart);
	79	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	80	regcache_raw_collect (regcache,
	81	gdbarch_tdep (gdbarch)->lbeg_regnum,
	82	&regs->lbeg);
	83	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	84	regcache_raw_collect (regcache,
	85	gdbarch_tdep (gdbarch)->lend_regnum,
	86	&regs->lend);
	87	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	88	regcache_raw_collect (regcache,
	89	gdbarch_tdep (gdbarch)->lcount_regnum,
	90	&regs->lcount);
	91	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	92	regcache_raw_collect (regcache,
	93	gdbarch_tdep (gdbarch)->sar_regnum,
	94	&regs->sar);
f74f865e MF	95	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
	96	regcache_raw_collect (regcache,
	97	gdbarch_tdep (gdbarch)->threadptr_regnum,
	98	&regs->threadptr);
94a0e877 MG	99	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	100	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	101	+ gdbarch_tdep (gdbarch)->num_aregs)
	102	regcache_raw_collect (regcache,regnum,
	103	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	104	else if (regnum == -1)
	105	{
	106	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	107	regcache_raw_collect (regcache,
	108	gdbarch_tdep (gdbarch)->ar_base + i,
	109	&regs->ar[i]);
	110	}
0ce4291e MF	111	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
	112	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
	113	regcache_raw_collect (regcache, regnum,
	114	&regs->ar[(4 * regs->windowbase + regnum
	115	- gdbarch_tdep (gdbarch)->a0_base)
	116	% gdbarch_tdep (gdbarch)->num_aregs]);
	117	else if (regnum == -1)
	118	{
	119	for (i = 0; i < C0_NREGS; ++i)
	120	regcache_raw_collect (regcache,
	121	gdbarch_tdep (gdbarch)->a0_base + i,
	122	&regs->ar[(4 * regs->windowbase + i)
	123	% gdbarch_tdep (gdbarch)->num_aregs]);
	124	}
94a0e877 MG	125	}
94a0e877 MG	126
1c215b97	127	static void
94a0e877 MG	128	supply_gregset_reg (struct regcache *regcache,
	129	const gdb_gregset_t *gregsetp, int regnum)
	130	{
	131	int i;
	132	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	133
ac7936df	134	struct gdbarch *gdbarch = regcache->arch ();
94a0e877 MG	135
	136	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
	137	regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
	138	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
	139	regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
	140
	141	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
	142	regcache_raw_supply (regcache,
	143	gdbarch_tdep (gdbarch)->wb_regnum,
	144	&regs->windowbase);
	145	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
	146	regcache_raw_supply (regcache,
	147	gdbarch_tdep (gdbarch)->ws_regnum,
	148	&regs->windowstart);
	149	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
	150	regcache_raw_supply (regcache,
	151	gdbarch_tdep (gdbarch)->lbeg_regnum,
	152	&regs->lbeg);
	153	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
	154	regcache_raw_supply (regcache,
	155	gdbarch_tdep (gdbarch)->lend_regnum,
	156	&regs->lend);
	157	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
	158	regcache_raw_supply (regcache,
	159	gdbarch_tdep (gdbarch)->lcount_regnum,
	160	&regs->lcount);
	161	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
	162	regcache_raw_supply (regcache,
	163	gdbarch_tdep (gdbarch)->sar_regnum,
	164	&regs->sar);
f74f865e MF	165	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
	166	regcache_raw_supply (regcache,
	167	gdbarch_tdep (gdbarch)->threadptr_regnum,
	168	&regs->threadptr);
94a0e877 MG	169	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	170	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	171	+ gdbarch_tdep (gdbarch)->num_aregs)
	172	regcache_raw_supply (regcache,regnum,
	173	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	174	else if (regnum == -1)
	175	{
	176	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
	177	regcache_raw_supply (regcache,
	178	gdbarch_tdep (gdbarch)->ar_base + i,
	179	&regs->ar[i]);
	180	}
0ce4291e MF	181	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
	182	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
	183	regcache_raw_supply (regcache, regnum,
	184	&regs->ar[(4 * regs->windowbase + regnum
	185	- gdbarch_tdep (gdbarch)->a0_base)
	186	% gdbarch_tdep (gdbarch)->num_aregs]);
	187	else if (regnum == -1)
	188	{
	189	for (i = 0; i < C0_NREGS; ++i)
	190	regcache_raw_supply (regcache,
	191	gdbarch_tdep (gdbarch)->a0_base + i,
	192	&regs->ar[(4 * regs->windowbase + i)
	193	% gdbarch_tdep (gdbarch)->num_aregs]);
	194	}
94a0e877 MG	195	}
	196
	197	void
	198	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
	199	{
	200	supply_gregset_reg (regcache, gregsetp, -1);
	201	}
	202
	203	void
	204	fill_fpregset (const struct regcache *regcache,
	205	gdb_fpregset_t *fpregsetp, int regnum)
	206	{
	207	return;
	208	}
	209
	210	void
	211	supply_fpregset (struct regcache *regcache,
	212	const gdb_fpregset_t *fpregsetp)
	213	{
	214	return;
	215	}
	216
	217	/* Fetch greg-register(s) from process/thread TID
	218	and store value(s) in GDB's register array. */
	219
	220	static void
	221	fetch_gregs (struct regcache *regcache, int regnum)
	222	{
bcc0c096	223	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
d274ecf4	224	gdb_gregset_t regs;
94a0e877 MG	225	int areg;
	226
	227	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	228	{
	229	perror_with_name (_("Couldn't get registers"));
	230	return;
	231	}
	232
	233	supply_gregset_reg (regcache, &regs, regnum);
	234	}
	235
	236	/* Store greg-register(s) in GDB's register
	237	array into the process/thread specified by TID. */
	238
	239	static void
	240	store_gregs (struct regcache *regcache, int regnum)
	241	{
bcc0c096	242	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	243	gdb_gregset_t regs;
	244	int areg;
	245
	246	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	247	{
	248	perror_with_name (_("Couldn't get registers"));
	249	return;
	250	}
	251
	252	fill_gregset (regcache, &regs, regnum);
	253
	254	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
	255	{
	256	perror_with_name (_("Couldn't write registers"));
	257	return;
	258	}
	259	}
	260
	261	static int xtreg_lo;
	262	static int xtreg_high;
	263
	264	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
	265	interface provides special requests for this. */
	266
	267	static void
	268	fetch_xtregs (struct regcache *regcache, int regnum)
	269	{
bcc0c096	270	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	271	const xtensa_regtable_t *ptr;
	272	char xtregs [XTENSA_ELF_XTREG_SIZE];
	273
	274	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	275	perror_with_name (_("Couldn't get extended registers"));
	276
	277	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	278	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	279	regcache_raw_supply (regcache, ptr->gdb_regnum,
	280	xtregs + ptr->ptrace_offset);
	281	}
	282
	283	static void
	284	store_xtregs (struct regcache *regcache, int regnum)
	285	{
bcc0c096	286	int tid = ptid_get_lwp (regcache_get_ptid (regcache));
94a0e877 MG	287	const xtensa_regtable_t *ptr;
	288	char xtregs [XTENSA_ELF_XTREG_SIZE];
	289
	290	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	291	perror_with_name (_("Couldn't get extended registers"));
	292
	293	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	294	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
	295	regcache_raw_collect (regcache, ptr->gdb_regnum,
	296	xtregs + ptr->ptrace_offset);
	297
	298	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
	299	perror_with_name (_("Couldn't write extended registers"));
	300	}
	301
f6ac5f3d PA	302	void
	303	xtensa_linux_nat_target::fetch_registers (struct regcache *regcache,
	304	int regnum)
94a0e877 MG	305	{
	306	if (regnum == -1)
	307	{
	308	fetch_gregs (regcache, regnum);
	309	fetch_xtregs (regcache, regnum);
	310	}
	311	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	312	fetch_gregs (regcache, regnum);
	313	else
	314	fetch_xtregs (regcache, regnum);
	315	}
	316
f6ac5f3d PA	317	void
	318	xtensa_linux_nat_target::store_registers (struct regcache *regcache,
	319	int regnum)
94a0e877 MG	320	{
	321	if (regnum == -1)
	322	{
	323	store_gregs (regcache, regnum);
	324	store_xtregs (regcache, regnum);
	325	}
	326	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	327	store_gregs (regcache, regnum);
	328	else
	329	store_xtregs (regcache, regnum);
	330	}
	331
40045d91 MF	332	/* Called by libthread_db. */
	333
	334	ps_err_e
754653a7	335	ps_get_thread_area (struct ps_prochandle *ph,
40045d91 MF	336	lwpid_t lwpid, int idx, void **base)
	337	{
	338	xtensa_elf_gregset_t regs;
	339
	340	if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
	341	return PS_ERR;
	342
	343	/* IDX is the bias from the thread pointer to the beginning of the
	344	thread descriptor. It has to be subtracted due to implementation
	345	quirks in libthread_db. */
	346	base = (void ) ((char *) regs.threadptr - idx);
	347
	348	return PS_OK;
	349	}
	350
94a0e877 MG	351	void
	352	_initialize_xtensa_linux_nat (void)
	353	{
94a0e877 MG	354	const xtensa_regtable_t *ptr;
	355
	356	/* Calculate the number range for extended registers. */
	357	xtreg_lo = 1000000000;
	358	xtreg_high = -1;
	359	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	360	{
	361	if (ptr->gdb_regnum < xtreg_lo)
	362	xtreg_lo = ptr->gdb_regnum;
	363	if (ptr->gdb_regnum > xtreg_high)
	364	xtreg_high = ptr->gdb_regnum;
	365	}
	366
f6ac5f3d	367	linux_target = &the_xtensa_linux_nat_target;
d9f719f1	368	add_inf_child_target (&the_xtensa_linux_nat_target);
94a0e877	369	}