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

/* Xtensa GNU/Linux native support.

   Copyright (C) 2007-2020 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 "gdbsupport/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 (gdbarch_pc_regnum (gdbarch), &regs->pc);
  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
    regcache->raw_collect (gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->wb_regnum,
			   &regs->windowbase);
  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->ws_regnum,
			   &regs->windowstart);
  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->lbeg_regnum,
			   &regs->lbeg);
  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->lend_regnum,
			   &regs->lend);
  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->lcount_regnum,
			   &regs->lcount);
  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
    regcache->raw_collect (gdbarch_tdep (gdbarch)->sar_regnum,
			   &regs->sar);
  if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
    regcache->raw_collect (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 (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 (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 (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 (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 (gdbarch_pc_regnum (gdbarch), &regs->pc);
  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
    regcache->raw_supply (gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->wb_regnum,
			  &regs->windowbase);
  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->ws_regnum,
			  &regs->windowstart);
  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->lbeg_regnum,
			  &regs->lbeg);
  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->lend_regnum,
			  &regs->lend);
  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->lcount_regnum,
			  &regs->lcount);
  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
    regcache->raw_supply (gdbarch_tdep (gdbarch)->sar_regnum,
			  &regs->sar);
  if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
    regcache->raw_supply (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 (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 (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 (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 (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 = regcache->ptid ().lwp ();
  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 = regcache->ptid ().lwp ();
  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 = regcache->ptid ().lwp ();
  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 (ptr->gdb_regnum, xtregs + ptr->ptrace_offset);
}

static void
store_xtregs (struct regcache *regcache, int regnum)
{
  int tid = regcache->ptid ().lwp ();
  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 (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
_initialize_xtensa_linux_nat ()
{
  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
b811d2c2	3	Copyright (C) 2007-2020 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>
268a13a5	31	#include "gdbsupport/gdb_wait.h"
94a0e877 MG	32	#include <fcntl.h>
94a0e877 MG	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
94a0e877 MG	66	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
34a79281	67	regcache->raw_collect (gdbarch_pc_regnum (gdbarch), &regs->pc);
94a0e877	68	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
34a79281	69	regcache->raw_collect (gdbarch_ps_regnum (gdbarch), &regs->ps);
94a0e877 MG	70
94a0e877 MG	71	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
34a79281 SM	72	regcache->raw_collect (gdbarch_tdep (gdbarch)->wb_regnum,
34a79281 SM	73	&regs->windowbase);
94a0e877	74	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
34a79281 SM	75	regcache->raw_collect (gdbarch_tdep (gdbarch)->ws_regnum,
34a79281 SM	76	&regs->windowstart);
94a0e877	77	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
34a79281 SM	78	regcache->raw_collect (gdbarch_tdep (gdbarch)->lbeg_regnum,
34a79281 SM	79	&regs->lbeg);
94a0e877	80	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
34a79281 SM	81	regcache->raw_collect (gdbarch_tdep (gdbarch)->lend_regnum,
34a79281 SM	82	&regs->lend);
94a0e877	83	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
34a79281 SM	84	regcache->raw_collect (gdbarch_tdep (gdbarch)->lcount_regnum,
34a79281 SM	85	&regs->lcount);
94a0e877	86	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
34a79281 SM	87	regcache->raw_collect (gdbarch_tdep (gdbarch)->sar_regnum,
34a79281 SM	88	&regs->sar);
f74f865e	89	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
34a79281 SM	90	regcache->raw_collect (gdbarch_tdep (gdbarch)->threadptr_regnum,
34a79281 SM	91	&regs->threadptr);
94a0e877 MG	92	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	93	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	94	+ gdbarch_tdep (gdbarch)->num_aregs)
34a79281 SM	95	regcache->raw_collect (regnum,
34a79281 SM	96	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
94a0e877 MG	97	else if (regnum == -1)
	98	{
	99	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
34a79281 SM	100	regcache->raw_collect (gdbarch_tdep (gdbarch)->ar_base + i,
34a79281 SM	101	&regs->ar[i]);
94a0e877	102	}
0ce4291e MF	103	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
0ce4291e MF	104	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
34a79281 SM	105	regcache->raw_collect (regnum,
	106	&regs->ar[(4 * regs->windowbase + regnum
	107	- gdbarch_tdep (gdbarch)->a0_base)
0ce4291e MF	108	% gdbarch_tdep (gdbarch)->num_aregs]);
	109	else if (regnum == -1)
	110	{
	111	for (i = 0; i < C0_NREGS; ++i)
34a79281 SM	112	regcache->raw_collect (gdbarch_tdep (gdbarch)->a0_base + i,
	113	(&regs->ar[(4 * regs->windowbase + i)
	114	% gdbarch_tdep (gdbarch)->num_aregs]));
0ce4291e	115	}
94a0e877 MG	116	}
94a0e877 MG	117
1c215b97	118	static void
94a0e877 MG	119	supply_gregset_reg (struct regcache *regcache,
	120	const gdb_gregset_t *gregsetp, int regnum)
	121	{
	122	int i;
	123	xtensa_elf_gregset_t regs = (xtensa_elf_gregset_t ) gregsetp;
	124
ac7936df	125	struct gdbarch *gdbarch = regcache->arch ();
94a0e877 MG	126
94a0e877 MG	127	if (regnum == gdbarch_pc_regnum (gdbarch) \|\| regnum == -1)
73e1c03f	128	regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &regs->pc);
94a0e877	129	if (regnum == gdbarch_ps_regnum (gdbarch) \|\| regnum == -1)
73e1c03f	130	regcache->raw_supply (gdbarch_ps_regnum (gdbarch), &regs->ps);
94a0e877 MG	131
94a0e877 MG	132	if (regnum == gdbarch_tdep (gdbarch)->wb_regnum \|\| regnum == -1)
73e1c03f	133	regcache->raw_supply (gdbarch_tdep (gdbarch)->wb_regnum,
94a0e877 MG	134	&regs->windowbase);
94a0e877 MG	135	if (regnum == gdbarch_tdep (gdbarch)->ws_regnum \|\| regnum == -1)
73e1c03f	136	regcache->raw_supply (gdbarch_tdep (gdbarch)->ws_regnum,
94a0e877 MG	137	&regs->windowstart);
94a0e877 MG	138	if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum \|\| regnum == -1)
73e1c03f	139	regcache->raw_supply (gdbarch_tdep (gdbarch)->lbeg_regnum,
94a0e877 MG	140	&regs->lbeg);
94a0e877 MG	141	if (regnum == gdbarch_tdep (gdbarch)->lend_regnum \|\| regnum == -1)
73e1c03f	142	regcache->raw_supply (gdbarch_tdep (gdbarch)->lend_regnum,
94a0e877 MG	143	&regs->lend);
94a0e877 MG	144	if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum \|\| regnum == -1)
73e1c03f	145	regcache->raw_supply (gdbarch_tdep (gdbarch)->lcount_regnum,
94a0e877 MG	146	&regs->lcount);
94a0e877 MG	147	if (regnum == gdbarch_tdep (gdbarch)->sar_regnum \|\| regnum == -1)
73e1c03f	148	regcache->raw_supply (gdbarch_tdep (gdbarch)->sar_regnum,
94a0e877	149	&regs->sar);
f74f865e	150	if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum \|\| regnum == -1)
73e1c03f	151	regcache->raw_supply (gdbarch_tdep (gdbarch)->threadptr_regnum,
f74f865e	152	&regs->threadptr);
94a0e877 MG	153	if (regnum >=gdbarch_tdep (gdbarch)->ar_base
	154	&& regnum < gdbarch_tdep (gdbarch)->ar_base
	155	+ gdbarch_tdep (gdbarch)->num_aregs)
73e1c03f	156	regcache->raw_supply (regnum,
94a0e877 MG	157	&regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
	158	else if (regnum == -1)
	159	{
	160	for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
73e1c03f	161	regcache->raw_supply (gdbarch_tdep (gdbarch)->ar_base + i,
94a0e877 MG	162	&regs->ar[i]);
94a0e877 MG	163	}
0ce4291e MF	164	if (regnum >= gdbarch_tdep (gdbarch)->a0_base
0ce4291e MF	165	&& regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
73e1c03f SM	166	regcache->raw_supply (regnum,
	167	&regs->ar[(4 * regs->windowbase + regnum
	168	- gdbarch_tdep (gdbarch)->a0_base)
0ce4291e MF	169	% gdbarch_tdep (gdbarch)->num_aregs]);
	170	else if (regnum == -1)
	171	{
	172	for (i = 0; i < C0_NREGS; ++i)
73e1c03f SM	173	regcache->raw_supply (gdbarch_tdep (gdbarch)->a0_base + i,
	174	&regs->ar[(4 * regs->windowbase + i)
	175	% gdbarch_tdep (gdbarch)->num_aregs]);
0ce4291e	176	}
94a0e877 MG	177	}
	178
	179	void
	180	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
	181	{
	182	supply_gregset_reg (regcache, gregsetp, -1);
	183	}
	184
	185	void
	186	fill_fpregset (const struct regcache *regcache,
	187	gdb_fpregset_t *fpregsetp, int regnum)
	188	{
	189	return;
	190	}
	191
	192	void
	193	supply_fpregset (struct regcache *regcache,
	194	const gdb_fpregset_t *fpregsetp)
	195	{
	196	return;
	197	}
	198
	199	/* Fetch greg-register(s) from process/thread TID
	200	and store value(s) in GDB's register array. */
	201
	202	static void
	203	fetch_gregs (struct regcache *regcache, int regnum)
	204	{
e38504b3	205	int tid = regcache->ptid ().lwp ();
d274ecf4	206	gdb_gregset_t regs;
94a0e877 MG	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	supply_gregset_reg (regcache, &regs, regnum);
	216	}
	217
	218	/* Store greg-register(s) in GDB's register
	219	array into the process/thread specified by TID. */
	220
	221	static void
	222	store_gregs (struct regcache *regcache, int regnum)
	223	{
e38504b3	224	int tid = regcache->ptid ().lwp ();
94a0e877 MG	225	gdb_gregset_t regs;
	226	int areg;
	227
	228	if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
	229	{
	230	perror_with_name (_("Couldn't get registers"));
	231	return;
	232	}
	233
	234	fill_gregset (regcache, &regs, regnum);
	235
	236	if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
	237	{
	238	perror_with_name (_("Couldn't write registers"));
	239	return;
	240	}
	241	}
	242
	243	static int xtreg_lo;
	244	static int xtreg_high;
	245
	246	/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
	247	interface provides special requests for this. */
	248
	249	static void
	250	fetch_xtregs (struct regcache *regcache, int regnum)
	251	{
e38504b3	252	int tid = regcache->ptid ().lwp ();
94a0e877 MG	253	const xtensa_regtable_t *ptr;
	254	char xtregs [XTENSA_ELF_XTREG_SIZE];
	255
	256	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	257	perror_with_name (_("Couldn't get extended registers"));
	258
	259	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	260	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
73e1c03f	261	regcache->raw_supply (ptr->gdb_regnum, xtregs + ptr->ptrace_offset);
94a0e877 MG	262	}
	263
	264	static void
	265	store_xtregs (struct regcache *regcache, int regnum)
	266	{
e38504b3	267	int tid = regcache->ptid ().lwp ();
94a0e877 MG	268	const xtensa_regtable_t *ptr;
	269	char xtregs [XTENSA_ELF_XTREG_SIZE];
	270
	271	if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
	272	perror_with_name (_("Couldn't get extended registers"));
	273
	274	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	275	if (regnum == ptr->gdb_regnum \|\| regnum == -1)
34a79281	276	regcache->raw_collect (ptr->gdb_regnum, xtregs + ptr->ptrace_offset);
94a0e877 MG	277
	278	if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
	279	perror_with_name (_("Couldn't write extended registers"));
	280	}
	281
f6ac5f3d PA	282	void
	283	xtensa_linux_nat_target::fetch_registers (struct regcache *regcache,
	284	int regnum)
94a0e877 MG	285	{
	286	if (regnum == -1)
	287	{
	288	fetch_gregs (regcache, regnum);
	289	fetch_xtregs (regcache, regnum);
	290	}
	291	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	292	fetch_gregs (regcache, regnum);
	293	else
	294	fetch_xtregs (regcache, regnum);
	295	}
	296
f6ac5f3d PA	297	void
	298	xtensa_linux_nat_target::store_registers (struct regcache *regcache,
	299	int regnum)
94a0e877 MG	300	{
	301	if (regnum == -1)
	302	{
	303	store_gregs (regcache, regnum);
	304	store_xtregs (regcache, regnum);
	305	}
	306	else if ((regnum < xtreg_lo) \|\| (regnum > xtreg_high))
	307	store_gregs (regcache, regnum);
	308	else
	309	store_xtregs (regcache, regnum);
	310	}
	311
40045d91 MF	312	/* Called by libthread_db. */
	313
	314	ps_err_e
754653a7	315	ps_get_thread_area (struct ps_prochandle *ph,
40045d91 MF	316	lwpid_t lwpid, int idx, void **base)
	317	{
	318	xtensa_elf_gregset_t regs;
	319
	320	if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
	321	return PS_ERR;
	322
	323	/* IDX is the bias from the thread pointer to the beginning of the
	324	thread descriptor. It has to be subtracted due to implementation
	325	quirks in libthread_db. */
	326	base = (void ) ((char *) regs.threadptr - idx);
	327
	328	return PS_OK;
	329	}
	330
6c265988	331	void _initialize_xtensa_linux_nat ();
94a0e877	332	void
6c265988	333	_initialize_xtensa_linux_nat ()
94a0e877	334	{
94a0e877 MG	335	const xtensa_regtable_t *ptr;
	336
	337	/* Calculate the number range for extended registers. */
	338	xtreg_lo = 1000000000;
	339	xtreg_high = -1;
	340	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	341	{
	342	if (ptr->gdb_regnum < xtreg_lo)
	343	xtreg_lo = ptr->gdb_regnum;
	344	if (ptr->gdb_regnum > xtreg_high)
	345	xtreg_high = ptr->gdb_regnum;
	346	}
	347
f6ac5f3d	348	linux_target = &the_xtensa_linux_nat_target;
d9f719f1	349	add_inf_child_target (&the_xtensa_linux_nat_target);
94a0e877	350	}