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

/* Native-dependent code for GNU/Linux on MIPS processors.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   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 "inferior.h"
#include "mips-tdep.h"
#include "target.h"
#include "regcache.h"
#include "linux-nat.h"
#include "mips-linux-tdep.h"
#include "target-descriptions.h"

#include "gdb_proc_service.h"
#include "gregset.h"

#include <sgidefs.h>
#include <sys/ptrace.h>

#include "features/mips-linux.c"
#include "features/mips64-linux.c"

#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif

/* Assume that we have PTRACE_GETREGS et al. support.  If we do not,
   we'll clear this and use PTRACE_PEEKUSER instead.  */
static int have_ptrace_regsets = 1;

/* Saved function pointers to fetch and store a single register using
   PTRACE_PEEKUSER and PTRACE_POKEUSER.  */

void (*super_fetch_registers) (struct regcache *, int);
void (*super_store_registers) (struct regcache *, int);

/* Map gdb internal register number to ptrace ``address''.
   These ``addresses'' are normally defined in <asm/ptrace.h>. 

   ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
   and there's no point in reading or setting MIPS_ZERO_REGNUM.
   We also can not set BADVADDR, CAUSE, or FCRIR via ptrace().  */

static CORE_ADDR
mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
  CORE_ADDR regaddr;

  if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
    error (_("Bogon register number %d."), regno);

  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
    regaddr = regno;
  else if ((regno >= mips_regnum (gdbarch)->fp0)
	   && (regno < mips_regnum (gdbarch)->fp0 + 32))
    regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
  else if (regno == mips_regnum (gdbarch)->pc)
    regaddr = PC;
  else if (regno == mips_regnum (gdbarch)->cause)
    regaddr = store? (CORE_ADDR) -1 : CAUSE;
  else if (regno == mips_regnum (gdbarch)->badvaddr)
    regaddr = store? (CORE_ADDR) -1 : BADVADDR;
  else if (regno == mips_regnum (gdbarch)->lo)
    regaddr = MMLO;
  else if (regno == mips_regnum (gdbarch)->hi)
    regaddr = MMHI;
  else if (regno == mips_regnum (gdbarch)->fp_control_status)
    regaddr = FPC_CSR;
  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
    regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
  else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
    regaddr = 0;
  else
    regaddr = (CORE_ADDR) -1;

  return regaddr;
}

static CORE_ADDR
mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
  CORE_ADDR regaddr;

  if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
    error (_("Bogon register number %d."), regno);

  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
    regaddr = regno;
  else if ((regno >= mips_regnum (gdbarch)->fp0)
	   && (regno < mips_regnum (gdbarch)->fp0 + 32))
    regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch));
  else if (regno == mips_regnum (gdbarch)->pc)
    regaddr = MIPS64_PC;
  else if (regno == mips_regnum (gdbarch)->cause)
    regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
  else if (regno == mips_regnum (gdbarch)->badvaddr)
    regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
  else if (regno == mips_regnum (gdbarch)->lo)
    regaddr = MIPS64_MMLO;
  else if (regno == mips_regnum (gdbarch)->hi)
    regaddr = MIPS64_MMHI;
  else if (regno == mips_regnum (gdbarch)->fp_control_status)
    regaddr = MIPS64_FPC_CSR;
  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
    regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
  else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
    regaddr = 0;
  else
    regaddr = (CORE_ADDR) -1;

  return regaddr;
}

/* Fetch the thread-local storage pointer for libthread_db.  */

ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
                    lwpid_t lwpid, int idx, void **base)
{
  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 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 *)*base - idx);

  return PS_OK;
}

/* Wrapper functions.  These are only used by libthread_db.  */

void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
    mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
  else
    mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
}

void
fill_gregset (const struct regcache *regcache,
	      gdb_gregset_t *gregsetp, int regno)
{
  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
    mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
  else
    mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
}

void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
    mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
  else
    mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
}

void
fill_fpregset (const struct regcache *regcache,
	       gdb_fpregset_t *fpregsetp, int regno)
{
  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
    mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
  else
    mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
}


/* Fetch REGNO (or all registers if REGNO == -1) from the target
   using PTRACE_GETREGS et al.  */

static void
mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  int is_fp;
  int tid;

  if (regno >= mips_regnum (gdbarch)->fp0
      && regno <= mips_regnum (gdbarch)->fp0 + 32)
    is_fp = 1;
  else if (regno == mips_regnum (gdbarch)->fp_control_status)
    is_fp = 1;
  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
    is_fp = 1;
  else
    is_fp = 0;

  tid = ptid_get_lwp (inferior_ptid);
  if (tid == 0)
    tid = ptid_get_pid (inferior_ptid);

  if (regno == -1 || !is_fp)
    {
      mips64_elf_gregset_t regs;

      if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	{
	  if (errno == EIO)
	    {
	      have_ptrace_regsets = 0;
	      return;
	    }
	  perror_with_name (_("Couldn't get registers"));
	}

      mips64_supply_gregset (regcache,
			     (const mips64_elf_gregset_t *) &regs);
    }

  if (regno == -1 || is_fp)
    {
      mips64_elf_fpregset_t fp_regs;

      if (ptrace (PTRACE_GETFPREGS, tid, 0L,
		  (PTRACE_TYPE_ARG3) &fp_regs) == -1)
	{
	  if (errno == EIO)
	    {
	      have_ptrace_regsets = 0;
	      return;
	    }
	  perror_with_name (_("Couldn't get FP registers"));
	}

      mips64_supply_fpregset (regcache,
			      (const mips64_elf_fpregset_t *) &fp_regs);
    }
}

/* Store REGNO (or all registers if REGNO == -1) to the target
   using PTRACE_SETREGS et al.  */

static void
mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  int is_fp;
  int tid;

  if (regno >= mips_regnum (gdbarch)->fp0
      && regno <= mips_regnum (gdbarch)->fp0 + 32)
    is_fp = 1;
  else if (regno == mips_regnum (gdbarch)->fp_control_status)
    is_fp = 1;
  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
    is_fp = 1;
  else
    is_fp = 0;

  tid = ptid_get_lwp (inferior_ptid);
  if (tid == 0)
    tid = ptid_get_pid (inferior_ptid);

  if (regno == -1 || !is_fp)
    {
      mips64_elf_gregset_t regs;

      if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	perror_with_name (_("Couldn't get registers"));

      mips64_fill_gregset (regcache, &regs, regno);

      if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	perror_with_name (_("Couldn't set registers"));
    }

  if (regno == -1 || is_fp)
    {
      mips64_elf_fpregset_t fp_regs;

      if (ptrace (PTRACE_GETFPREGS, tid, 0L,
		  (PTRACE_TYPE_ARG3) &fp_regs) == -1)
	perror_with_name (_("Couldn't get FP registers"));

      mips64_fill_fpregset (regcache, &fp_regs, regno);

      if (ptrace (PTRACE_SETFPREGS, tid, 0L,
		  (PTRACE_TYPE_ARG3) &fp_regs) == -1)
	perror_with_name (_("Couldn't set FP registers"));
    }
}

/* Fetch REGNO (or all registers if REGNO == -1) from the target
   using any working method.  */

static void
mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
{
  /* Unless we already know that PTRACE_GETREGS does not work, try it.  */
  if (have_ptrace_regsets)
    mips64_linux_regsets_fetch_registers (regcache, regnum);

  /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
     back to PTRACE_PEEKUSER.  */
  if (!have_ptrace_regsets)
    super_fetch_registers (regcache, regnum);
}

/* Store REGNO (or all registers if REGNO == -1) to the target
   using any working method.  */

static void
mips64_linux_store_registers (struct regcache *regcache, int regnum)
{
  /* Unless we already know that PTRACE_GETREGS does not work, try it.  */
  if (have_ptrace_regsets)
    mips64_linux_regsets_store_registers (regcache, regnum);

  /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
     back to PTRACE_PEEKUSER.  */
  if (!have_ptrace_regsets)
    super_store_registers (regcache, regnum);
}

/* Return the address in the core dump or inferior of register
   REGNO.  */

static CORE_ADDR
mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
{
  if (mips_abi_regsize (gdbarch) == 8)
    return mips64_linux_register_addr (gdbarch, regno, store_p);
  else
    return mips_linux_register_addr (gdbarch, regno, store_p);
}

static const struct target_desc *
mips_linux_read_description (struct target_ops *ops)
{
  /* Report that target registers are a size we know for sure
     that we can get from ptrace.  */
  if (_MIPS_SIM == _ABIO32)
    return tdesc_mips_linux;
  else
    return tdesc_mips64_linux;
}

void _initialize_mips_linux_nat (void);

void
_initialize_mips_linux_nat (void)
{
  struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);

  super_fetch_registers = t->to_fetch_registers;
  super_store_registers = t->to_store_registers;

  t->to_fetch_registers = mips64_linux_fetch_registers;
  t->to_store_registers = mips64_linux_store_registers;

  t->to_read_description = mips_linux_read_description;

  linux_nat_add_target (t);

  /* Initialize the standard target descriptions.  */
  initialize_tdesc_mips_linux ();
  initialize_tdesc_mips64_linux ();
}
Commit	Line	Data
	1	/* Native-dependent code for GNU/Linux on MIPS processors.
	2
	3	Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
	4	Free Software Foundation, Inc.
	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 3 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	20
	21	#include "defs.h"
	22	#include "inferior.h"
	23	#include "mips-tdep.h"
	24	#include "target.h"
	25	#include "regcache.h"
	26	#include "linux-nat.h"
	27	#include "mips-linux-tdep.h"
	28	#include "target-descriptions.h"
	29
	30	#include "gdb_proc_service.h"
	31	#include "gregset.h"
	32
	33	#include <sgidefs.h>
	34	#include <sys/ptrace.h>
	35
	36	#include "features/mips-linux.c"
	37	#include "features/mips64-linux.c"
	38
	39	#ifndef PTRACE_GET_THREAD_AREA
	40	#define PTRACE_GET_THREAD_AREA 25
	41	#endif
	42
	43	/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
	44	we'll clear this and use PTRACE_PEEKUSER instead. */
	45	static int have_ptrace_regsets = 1;
	46
	47	/* Saved function pointers to fetch and store a single register using
	48	PTRACE_PEEKUSER and PTRACE_POKEUSER. */
	49
	50	void (super_fetch_registers) (struct regcache , int);
	51	void (super_store_registers) (struct regcache , int);
	52
	53	/* Map gdb internal register number to ptrace ``address''.
	54	These ``addresses'' are normally defined in <asm/ptrace.h>.
	55
	56	ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
	57	and there's no point in reading or setting MIPS_ZERO_REGNUM.
	58	We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */
	59
	60	static CORE_ADDR
	61	mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
	62	{
	63	CORE_ADDR regaddr;
	64
	65	if (regno < 0 \|\| regno >= gdbarch_num_regs (gdbarch))
	66	error (_("Bogon register number %d."), regno);
	67
	68	if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
	69	regaddr = regno;
	70	else if ((regno >= mips_regnum (gdbarch)->fp0)
	71	&& (regno < mips_regnum (gdbarch)->fp0 + 32))
	72	regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
	73	else if (regno == mips_regnum (gdbarch)->pc)
	74	regaddr = PC;
	75	else if (regno == mips_regnum (gdbarch)->cause)
	76	regaddr = store? (CORE_ADDR) -1 : CAUSE;
	77	else if (regno == mips_regnum (gdbarch)->badvaddr)
	78	regaddr = store? (CORE_ADDR) -1 : BADVADDR;
	79	else if (regno == mips_regnum (gdbarch)->lo)
	80	regaddr = MMLO;
	81	else if (regno == mips_regnum (gdbarch)->hi)
	82	regaddr = MMHI;
	83	else if (regno == mips_regnum (gdbarch)->fp_control_status)
	84	regaddr = FPC_CSR;
	85	else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
	86	regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
	87	else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
	88	regaddr = 0;
	89	else
	90	regaddr = (CORE_ADDR) -1;
	91
	92	return regaddr;
	93	}
	94
	95	static CORE_ADDR
	96	mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
	97	{
	98	CORE_ADDR regaddr;
	99
	100	if (regno < 0 \|\| regno >= gdbarch_num_regs (gdbarch))
	101	error (_("Bogon register number %d."), regno);
	102
	103	if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
	104	regaddr = regno;
	105	else if ((regno >= mips_regnum (gdbarch)->fp0)
	106	&& (regno < mips_regnum (gdbarch)->fp0 + 32))
	107	regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch));
	108	else if (regno == mips_regnum (gdbarch)->pc)
	109	regaddr = MIPS64_PC;
	110	else if (regno == mips_regnum (gdbarch)->cause)
	111	regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
	112	else if (regno == mips_regnum (gdbarch)->badvaddr)
	113	regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
	114	else if (regno == mips_regnum (gdbarch)->lo)
	115	regaddr = MIPS64_MMLO;
	116	else if (regno == mips_regnum (gdbarch)->hi)
	117	regaddr = MIPS64_MMHI;
	118	else if (regno == mips_regnum (gdbarch)->fp_control_status)
	119	regaddr = MIPS64_FPC_CSR;
	120	else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
	121	regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
	122	else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
	123	regaddr = 0;
	124	else
	125	regaddr = (CORE_ADDR) -1;
	126
	127	return regaddr;
	128	}
	129
	130	/* Fetch the thread-local storage pointer for libthread_db. */
	131
	132	ps_err_e
	133	ps_get_thread_area (const struct ps_prochandle *ph,
	134	lwpid_t lwpid, int idx, void **base)
	135	{
	136	if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
	137	return PS_ERR;
	138
	139	/* IDX is the bias from the thread pointer to the beginning of the
	140	thread descriptor. It has to be subtracted due to implementation
	141	quirks in libthread_db. */
	142	base = (void ) ((char )base - idx);
	143
	144	return PS_OK;
	145	}
	146
	147	/* Wrapper functions. These are only used by libthread_db. */
	148
	149	void
	150	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
	151	{
	152	if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
	153	mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
	154	else
	155	mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
	156	}
	157
	158	void
	159	fill_gregset (const struct regcache *regcache,
	160	gdb_gregset_t *gregsetp, int regno)
	161	{
	162	if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
	163	mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
	164	else
	165	mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
	166	}
	167
	168	void
	169	supply_fpregset (struct regcache regcache, const gdb_fpregset_t fpregsetp)
	170	{
	171	if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
	172	mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
	173	else
	174	mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
	175	}
	176
	177	void
	178	fill_fpregset (const struct regcache *regcache,
	179	gdb_fpregset_t *fpregsetp, int regno)
	180	{
	181	if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
	182	mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
	183	else
	184	mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
	185	}
	186
	187
	188	/* Fetch REGNO (or all registers if REGNO == -1) from the target
	189	using PTRACE_GETREGS et al. */
	190
	191	static void
	192	mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
	193	{
	194	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	195	int is_fp;
	196	int tid;
	197
	198	if (regno >= mips_regnum (gdbarch)->fp0
	199	&& regno <= mips_regnum (gdbarch)->fp0 + 32)
	200	is_fp = 1;
	201	else if (regno == mips_regnum (gdbarch)->fp_control_status)
	202	is_fp = 1;
	203	else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
	204	is_fp = 1;
	205	else
	206	is_fp = 0;
	207
	208	tid = ptid_get_lwp (inferior_ptid);
	209	if (tid == 0)
	210	tid = ptid_get_pid (inferior_ptid);
	211
	212	if (regno == -1 \|\| !is_fp)
	213	{
	214	mips64_elf_gregset_t regs;
	215
	216	if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	217	{
	218	if (errno == EIO)
	219	{
	220	have_ptrace_regsets = 0;
	221	return;
	222	}
	223	perror_with_name (_("Couldn't get registers"));
	224	}
	225
	226	mips64_supply_gregset (regcache,
	227	(const mips64_elf_gregset_t *) &regs);
	228	}
	229
	230	if (regno == -1 \|\| is_fp)
	231	{
	232	mips64_elf_fpregset_t fp_regs;
	233
	234	if (ptrace (PTRACE_GETFPREGS, tid, 0L,
	235	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	236	{
	237	if (errno == EIO)
	238	{
	239	have_ptrace_regsets = 0;
	240	return;
	241	}
	242	perror_with_name (_("Couldn't get FP registers"));
	243	}
	244
	245	mips64_supply_fpregset (regcache,
	246	(const mips64_elf_fpregset_t *) &fp_regs);
	247	}
	248	}
	249
	250	/* Store REGNO (or all registers if REGNO == -1) to the target
	251	using PTRACE_SETREGS et al. */
	252
	253	static void
	254	mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
	255	{
	256	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	257	int is_fp;
	258	int tid;
	259
	260	if (regno >= mips_regnum (gdbarch)->fp0
	261	&& regno <= mips_regnum (gdbarch)->fp0 + 32)
	262	is_fp = 1;
	263	else if (regno == mips_regnum (gdbarch)->fp_control_status)
	264	is_fp = 1;
	265	else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
	266	is_fp = 1;
	267	else
	268	is_fp = 0;
	269
	270	tid = ptid_get_lwp (inferior_ptid);
	271	if (tid == 0)
	272	tid = ptid_get_pid (inferior_ptid);
	273
	274	if (regno == -1 \|\| !is_fp)
	275	{
	276	mips64_elf_gregset_t regs;
	277
	278	if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	279	perror_with_name (_("Couldn't get registers"));
	280
	281	mips64_fill_gregset (regcache, &regs, regno);
	282
	283	if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	284	perror_with_name (_("Couldn't set registers"));
	285	}
	286
	287	if (regno == -1 \|\| is_fp)
	288	{
	289	mips64_elf_fpregset_t fp_regs;
	290
	291	if (ptrace (PTRACE_GETFPREGS, tid, 0L,
	292	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	293	perror_with_name (_("Couldn't get FP registers"));
	294
	295	mips64_fill_fpregset (regcache, &fp_regs, regno);
	296
	297	if (ptrace (PTRACE_SETFPREGS, tid, 0L,
	298	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	299	perror_with_name (_("Couldn't set FP registers"));
	300	}
	301	}
	302
	303	/* Fetch REGNO (or all registers if REGNO == -1) from the target
	304	using any working method. */
	305
	306	static void
	307	mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
	308	{
	309	/* Unless we already know that PTRACE_GETREGS does not work, try it. */
	310	if (have_ptrace_regsets)
	311	mips64_linux_regsets_fetch_registers (regcache, regnum);
	312
	313	/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
	314	back to PTRACE_PEEKUSER. */
	315	if (!have_ptrace_regsets)
	316	super_fetch_registers (regcache, regnum);
	317	}
	318
	319	/* Store REGNO (or all registers if REGNO == -1) to the target
	320	using any working method. */
	321
	322	static void
	323	mips64_linux_store_registers (struct regcache *regcache, int regnum)
	324	{
	325	/* Unless we already know that PTRACE_GETREGS does not work, try it. */
	326	if (have_ptrace_regsets)
	327	mips64_linux_regsets_store_registers (regcache, regnum);
	328
	329	/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
	330	back to PTRACE_PEEKUSER. */
	331	if (!have_ptrace_regsets)
	332	super_store_registers (regcache, regnum);
	333	}
	334
	335	/* Return the address in the core dump or inferior of register
	336	REGNO. */
	337
	338	static CORE_ADDR
	339	mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
	340	{
	341	if (mips_abi_regsize (gdbarch) == 8)
	342	return mips64_linux_register_addr (gdbarch, regno, store_p);
	343	else
	344	return mips_linux_register_addr (gdbarch, regno, store_p);
	345	}
	346
	347	static const struct target_desc *
	348	mips_linux_read_description (struct target_ops *ops)
	349	{
	350	/* Report that target registers are a size we know for sure
	351	that we can get from ptrace. */
	352	if (_MIPS_SIM == _ABIO32)
	353	return tdesc_mips_linux;
	354	else
	355	return tdesc_mips64_linux;
	356	}
	357
	358	void _initialize_mips_linux_nat (void);
	359
	360	void
	361	_initialize_mips_linux_nat (void)
	362	{
	363	struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
	364
	365	super_fetch_registers = t->to_fetch_registers;
	366	super_store_registers = t->to_store_registers;
	367
	368	t->to_fetch_registers = mips64_linux_fetch_registers;
	369	t->to_store_registers = mips64_linux_store_registers;
	370
	371	t->to_read_description = mips_linux_read_description;
	372
	373	linux_nat_add_target (t);
	374
	375	/* Initialize the standard target descriptions. */
	376	initialize_tdesc_mips_linux ();
	377	initialize_tdesc_mips64_linux ();
	378	}