[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
   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 2 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

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

#include <sys/ptrace.h>

#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);

/* Pseudo registers can not be read.  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().  */

int
mips_linux_cannot_fetch_register (int regno)
{
  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
    return 0;
  else if (regno >= mips_regnum (current_gdbarch)->fp0
	   && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
    return 0;
  else if (regno == mips_regnum (current_gdbarch)->lo
	   || regno == mips_regnum (current_gdbarch)->hi
	   || regno == mips_regnum (current_gdbarch)->badvaddr
	   || regno == mips_regnum (current_gdbarch)->cause
	   || regno == mips_regnum (current_gdbarch)->pc
	   || regno == mips_regnum (current_gdbarch)->fp_control_status
	   || regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
    return 0;
  else
    return 1;
}

int
mips_linux_cannot_store_register (int regno)
{
  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
    return 0;
  else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
    return 0;
  else if (regno == mips_regnum (current_gdbarch)->lo
	   || regno == mips_regnum (current_gdbarch)->hi
	   || regno == mips_regnum (current_gdbarch)->pc
	   || regno == mips_regnum (current_gdbarch)->fp_control_status)
    return 0;
  else
    return 1;
}

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

static CORE_ADDR
mips_linux_register_addr (int regno)
{
  int regaddr;

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

  if (regno < 32)
    regaddr = regno;
  else if ((regno >= mips_regnum (current_gdbarch)->fp0)
	   && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
    regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
  else if (regno == mips_regnum (current_gdbarch)->pc)
    regaddr = PC;
  else if (regno == mips_regnum (current_gdbarch)->cause)
    regaddr = CAUSE;
  else if (regno == mips_regnum (current_gdbarch)->badvaddr)
    regaddr = BADVADDR;
  else if (regno == mips_regnum (current_gdbarch)->lo)
    regaddr = MMLO;
  else if (regno == mips_regnum (current_gdbarch)->hi)
    regaddr = MMHI;
  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
    regaddr = FPC_CSR;
  else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
    regaddr = FPC_EIR;
  else
    error (_("Unknowable register number %d."), regno);

  return regaddr;
}

static CORE_ADDR
mips64_linux_register_addr (int regno)
{
  int regaddr;

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

  if (regno < 32)
    regaddr = regno;
  else if ((regno >= mips_regnum (current_gdbarch)->fp0)
	   && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
    regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
  else if (regno == mips_regnum (current_gdbarch)->pc)
    regaddr = MIPS64_PC;
  else if (regno == mips_regnum (current_gdbarch)->cause)
    regaddr = MIPS64_CAUSE;
  else if (regno == mips_regnum (current_gdbarch)->badvaddr)
    regaddr = MIPS64_BADVADDR;
  else if (regno == mips_regnum (current_gdbarch)->lo)
    regaddr = MIPS64_MMLO;
  else if (regno == mips_regnum (current_gdbarch)->hi)
    regaddr = MIPS64_MMHI;
  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
    regaddr = MIPS64_FPC_CSR;
  else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
    regaddr = MIPS64_FPC_EIR;
  else
    error (_("Unknowable register number %d."), regno);

  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 (current_gdbarch) == 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 (current_gdbarch) == 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 (current_gdbarch) == 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 (current_gdbarch) == 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)
{
  int is_fp;
  int tid;

  if (regno >= mips_regnum (current_gdbarch)->fp0
      && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
    is_fp = 1;
  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
    is_fp = 1;
  else if (regno == mips_regnum (current_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)
{
  int is_fp;
  int tid;

  if (regno >= mips_regnum (current_gdbarch)->fp0
      && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
    is_fp = 1;
  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
    is_fp = 1;
  else if (regno == mips_regnum (current_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 (int regno)
{
  if (mips_abi_regsize (current_gdbarch) == 8)
    return mips64_linux_register_addr (regno);
  else
    return mips_linux_register_addr (regno);
}

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;

  linux_nat_add_target (t);
}
Commit	Line	Data
75c9abc6	1	/* Native-dependent code for GNU/Linux on MIPS processors.
a094c6fb	2
6aba47ca	3	Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
dc60ece8	4	Free Software Foundation, Inc.
2aa830e4 DJ	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 2 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, write to the Free Software
197e01b6 EZ	20	Foundation, Inc., 51 Franklin Street, Fifth Floor,
197e01b6 EZ	21	Boston, MA 02110-1301, USA. */
2aa830e4 DJ	22
2aa830e4 DJ	23	#include "defs.h"
d37eb719	24	#include "inferior.h"
6b753f60	25	#include "mips-tdep.h"
10d6c8cd	26	#include "target.h"
28f5035f	27	#include "regcache.h"
10d6c8cd	28	#include "linux-nat.h"
d37eb719	29	#include "mips-linux-tdep.h"
2aa830e4	30
dc60ece8	31	#include "gdb_proc_service.h"
3e00823e	32	#include "gregset.h"
dc60ece8	33
d37eb719 DJ	34	#include <sys/ptrace.h>
d37eb719 DJ	35
dc60ece8 DJ	36	#ifndef PTRACE_GET_THREAD_AREA
	37	#define PTRACE_GET_THREAD_AREA 25
	38	#endif
	39
d37eb719 DJ	40	/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
	41	we'll clear this and use PTRACE_PEEKUSER instead. */
	42	static int have_ptrace_regsets = 1;
	43
	44	/* Saved function pointers to fetch and store a single register using
	45	PTRACE_PEEKUSER and PTRACE_POKEUSER. */
	46
56be3814 UW	47	void (super_fetch_registers) (struct regcache , int);
56be3814 UW	48	void (super_store_registers) (struct regcache , int);
d37eb719	49
2aa830e4	50	/* Pseudo registers can not be read. ptrace does not provide a way to
24e05951 AC	51	read (or set) MIPS_PS_REGNUM, and there's no point in reading or
	52	setting MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or
	53	FCRIR via ptrace(). */
2aa830e4 DJ	54
	55	int
	56	mips_linux_cannot_fetch_register (int regno)
	57	{
613e114f	58	if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
2aa830e4	59	return 0;
56cea623 AC	60	else if (regno >= mips_regnum (current_gdbarch)->fp0
56cea623 AC	61	&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
fd8f87c5	62	return 0;
56cea623 AC	63	else if (regno == mips_regnum (current_gdbarch)->lo
	64	\|\| regno == mips_regnum (current_gdbarch)->hi
	65	\|\| regno == mips_regnum (current_gdbarch)->badvaddr
	66	\|\| regno == mips_regnum (current_gdbarch)->cause
	67	\|\| regno == mips_regnum (current_gdbarch)->pc
	68	\|\| regno == mips_regnum (current_gdbarch)->fp_control_status
	69	\|\| regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
	70	return 0;
	71	else
	72	return 1;
2aa830e4 DJ	73	}
	74
	75	int
	76	mips_linux_cannot_store_register (int regno)
	77	{
613e114f	78	if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
2aa830e4	79	return 0;
fd8f87c5 DJ	80	else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
fd8f87c5 DJ	81	return 0;
56cea623 AC	82	else if (regno == mips_regnum (current_gdbarch)->lo
	83	\|\| regno == mips_regnum (current_gdbarch)->hi
	84	\|\| regno == mips_regnum (current_gdbarch)->pc
	85	\|\| regno == mips_regnum (current_gdbarch)->fp_control_status)
	86	return 0;
	87	else
	88	return 1;
2aa830e4	89	}
10d6c8cd	90
dda0c97e UW	91	/* Map gdb internal register number to ptrace ``address''.
	92	These ``addresses'' are normally defined in <asm/ptrace.h>. */
	93
	94	static CORE_ADDR
	95	mips_linux_register_addr (int regno)
	96	{
	97	int regaddr;
	98
	99	if (regno < 0 \|\| regno >= NUM_REGS)
	100	error (_("Bogon register number %d."), regno);
	101
	102	if (regno < 32)
	103	regaddr = regno;
	104	else if ((regno >= mips_regnum (current_gdbarch)->fp0)
	105	&& (regno < mips_regnum (current_gdbarch)->fp0 + 32))
	106	regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
	107	else if (regno == mips_regnum (current_gdbarch)->pc)
	108	regaddr = PC;
	109	else if (regno == mips_regnum (current_gdbarch)->cause)
	110	regaddr = CAUSE;
	111	else if (regno == mips_regnum (current_gdbarch)->badvaddr)
	112	regaddr = BADVADDR;
	113	else if (regno == mips_regnum (current_gdbarch)->lo)
	114	regaddr = MMLO;
	115	else if (regno == mips_regnum (current_gdbarch)->hi)
	116	regaddr = MMHI;
	117	else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
	118	regaddr = FPC_CSR;
	119	else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
	120	regaddr = FPC_EIR;
	121	else
	122	error (_("Unknowable register number %d."), regno);
	123
	124	return regaddr;
	125	}
	126
	127	static CORE_ADDR
	128	mips64_linux_register_addr (int regno)
	129	{
	130	int regaddr;
	131
	132	if (regno < 0 \|\| regno >= NUM_REGS)
	133	error (_("Bogon register number %d."), regno);
	134
	135	if (regno < 32)
	136	regaddr = regno;
	137	else if ((regno >= mips_regnum (current_gdbarch)->fp0)
	138	&& (regno < mips_regnum (current_gdbarch)->fp0 + 32))
	139	regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
	140	else if (regno == mips_regnum (current_gdbarch)->pc)
	141	regaddr = MIPS64_PC;
	142	else if (regno == mips_regnum (current_gdbarch)->cause)
	143	regaddr = MIPS64_CAUSE;
	144	else if (regno == mips_regnum (current_gdbarch)->badvaddr)
	145	regaddr = MIPS64_BADVADDR;
	146	else if (regno == mips_regnum (current_gdbarch)->lo)
	147	regaddr = MIPS64_MMLO;
	148	else if (regno == mips_regnum (current_gdbarch)->hi)
	149	regaddr = MIPS64_MMHI;
	150	else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
	151	regaddr = MIPS64_FPC_CSR;
	152	else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
	153	regaddr = MIPS64_FPC_EIR;
	154	else
155	error (_("Unknowable register number %d."), regno);
156
157	return regaddr;
158	}
159
dc60ece8 DJ	160	/* Fetch the thread-local storage pointer for libthread_db. */
	161
	162	ps_err_e
	163	ps_get_thread_area (const struct ps_prochandle *ph,
	164	lwpid_t lwpid, int idx, void **base)
	165	{
	166	if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
	167	return PS_ERR;
	168
	169	/* IDX is the bias from the thread pointer to the beginning of the
	170	thread descriptor. It has to be subtracted due to implementation
	171	quirks in libthread_db. */
	172	base = (void ) ((char )base - idx);
	173
	174	return PS_OK;
	175	}
	176
3e00823e UW	177	/* Wrapper functions. These are only used by libthread_db. */
	178
	179	void
7f7fe91e	180	supply_gregset (struct regcache regcache, const gdb_gregset_t gregsetp)
3e00823e UW	181	{
3e00823e UW	182	if (mips_isa_regsize (current_gdbarch) == 4)
7f7fe91e	183	mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
3e00823e	184	else
7f7fe91e	185	mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
3e00823e UW	186	}
	187
	188	void
7f7fe91e UW	189	fill_gregset (const struct regcache *regcache,
7f7fe91e UW	190	gdb_gregset_t *gregsetp, int regno)
3e00823e UW	191	{
3e00823e UW	192	if (mips_isa_regsize (current_gdbarch) == 4)
7f7fe91e	193	mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
3e00823e	194	else
7f7fe91e	195	mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
3e00823e UW	196	}
	197
	198	void
7f7fe91e	199	supply_fpregset (struct regcache regcache, const gdb_fpregset_t fpregsetp)
3e00823e UW	200	{
3e00823e UW	201	if (mips_isa_regsize (current_gdbarch) == 4)
7f7fe91e	202	mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
3e00823e	203	else
7f7fe91e	204	mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
3e00823e UW	205	}
	206
	207	void
7f7fe91e UW	208	fill_fpregset (const struct regcache *regcache,
7f7fe91e UW	209	gdb_fpregset_t *fpregsetp, int regno)
3e00823e UW	210	{
3e00823e UW	211	if (mips_isa_regsize (current_gdbarch) == 4)
7f7fe91e	212	mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
3e00823e	213	else
7f7fe91e	214	mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
3e00823e UW	215	}
	216
	217
d37eb719 DJ	218	/* Fetch REGNO (or all registers if REGNO == -1) from the target
	219	using PTRACE_GETREGS et al. */
	220
	221	static void
56be3814	222	mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
d37eb719 DJ	223	{
	224	int is_fp;
	225	int tid;
	226
	227	if (regno >= mips_regnum (current_gdbarch)->fp0
	228	&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
	229	is_fp = 1;
	230	else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
	231	is_fp = 1;
	232	else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
	233	is_fp = 1;
	234	else
	235	is_fp = 0;
	236
	237	tid = ptid_get_lwp (inferior_ptid);
	238	if (tid == 0)
	239	tid = ptid_get_pid (inferior_ptid);
	240
	241	if (regno == -1 \|\| !is_fp)
	242	{
	243	mips64_elf_gregset_t regs;
	244
	245	if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	246	{
	247	if (errno == EIO)
	248	{
	249	have_ptrace_regsets = 0;
	250	return;
	251	}
	252	perror_with_name (_("Couldn't get registers"));
	253	}
	254
56be3814	255	mips64_supply_gregset (regcache,
28f5035f	256	(const mips64_elf_gregset_t *) &regs);
d37eb719 DJ	257	}
	258
	259	if (regno == -1 \|\| is_fp)
	260	{
	261	mips64_elf_fpregset_t fp_regs;
	262
	263	if (ptrace (PTRACE_GETFPREGS, tid, 0L,
	264	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	265	{
	266	if (errno == EIO)
	267	{
	268	have_ptrace_regsets = 0;
	269	return;
	270	}
	271	perror_with_name (_("Couldn't get FP registers"));
	272	}
	273
56be3814	274	mips64_supply_fpregset (regcache,
28f5035f	275	(const mips64_elf_fpregset_t *) &fp_regs);
d37eb719 DJ	276	}
	277	}
	278
	279	/* Store REGNO (or all registers if REGNO == -1) to the target
	280	using PTRACE_SETREGS et al. */
	281
	282	static void
56be3814	283	mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
d37eb719 DJ	284	{
	285	int is_fp;
	286	int tid;
	287
	288	if (regno >= mips_regnum (current_gdbarch)->fp0
	289	&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
	290	is_fp = 1;
	291	else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
	292	is_fp = 1;
	293	else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
	294	is_fp = 1;
	295	else
	296	is_fp = 0;
	297
	298	tid = ptid_get_lwp (inferior_ptid);
	299	if (tid == 0)
	300	tid = ptid_get_pid (inferior_ptid);
	301
	302	if (regno == -1 \|\| !is_fp)
	303	{
	304	mips64_elf_gregset_t regs;
	305
	306	if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	307	perror_with_name (_("Couldn't get registers"));
	308
56be3814	309	mips64_fill_gregset (regcache, &regs, regno);
d37eb719 DJ	310
	311	if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)
	312	perror_with_name (_("Couldn't set registers"));
	313	}
	314
	315	if (regno == -1 \|\| is_fp)
	316	{
	317	mips64_elf_fpregset_t fp_regs;
	318
	319	if (ptrace (PTRACE_GETFPREGS, tid, 0L,
	320	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	321	perror_with_name (_("Couldn't get FP registers"));
	322
56be3814	323	mips64_fill_fpregset (regcache, &fp_regs, regno);
d37eb719 DJ	324
	325	if (ptrace (PTRACE_SETFPREGS, tid, 0L,
	326	(PTRACE_TYPE_ARG3) &fp_regs) == -1)
	327	perror_with_name (_("Couldn't set FP registers"));
	328	}
	329	}
	330
	331	/* Fetch REGNO (or all registers if REGNO == -1) from the target
	332	using any working method. */
	333
	334	static void
56be3814	335	mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
d37eb719 DJ	336	{
	337	/* Unless we already know that PTRACE_GETREGS does not work, try it. */
	338	if (have_ptrace_regsets)
56be3814	339	mips64_linux_regsets_fetch_registers (regcache, regnum);
d37eb719 DJ	340
	341	/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
	342	back to PTRACE_PEEKUSER. */
	343	if (!have_ptrace_regsets)
56be3814	344	super_fetch_registers (regcache, regnum);
d37eb719 DJ	345	}
	346
	347	/* Store REGNO (or all registers if REGNO == -1) to the target
	348	using any working method. */
	349
	350	static void
56be3814	351	mips64_linux_store_registers (struct regcache *regcache, int regnum)
d37eb719 DJ	352	{
	353	/* Unless we already know that PTRACE_GETREGS does not work, try it. */
	354	if (have_ptrace_regsets)
56be3814	355	mips64_linux_regsets_store_registers (regcache, regnum);
d37eb719 DJ	356
	357	/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
	358	back to PTRACE_PEEKUSER. */
	359	if (!have_ptrace_regsets)
56be3814	360	super_store_registers (regcache, regnum);
d37eb719 DJ	361	}
d37eb719 DJ	362
910122bf UW	363	/* Return the address in the core dump or inferior of register
	364	REGNO. */
	365
	366	static CORE_ADDR
	367	mips_linux_register_u_offset (int regno)
	368	{
dda0c97e UW	369	if (mips_abi_regsize (current_gdbarch) == 8)
	370	return mips64_linux_register_addr (regno);
	371	else
	372	return mips_linux_register_addr (regno);
910122bf UW	373	}
910122bf UW	374
10d6c8cd DJ	375	void _initialize_mips_linux_nat (void);
	376
	377	void
	378	_initialize_mips_linux_nat (void)
	379	{
910122bf	380	struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
d37eb719 DJ	381
	382	super_fetch_registers = t->to_fetch_registers;
	383	super_store_registers = t->to_store_registers;
	384
	385	t->to_fetch_registers = mips64_linux_fetch_registers;
	386	t->to_store_registers = mips64_linux_store_registers;
	387
f973ed9c	388	linux_nat_add_target (t);
10d6c8cd	389	}