[deliverable/binutils-gdb.git] / gdb / sparc-nat.c

/* Native-dependent code for SPARC.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
   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 "regcache.h"
#include "target.h"

#include "gdb_assert.h"
#include <signal.h>
#include "gdb_string.h"
#include <sys/ptrace.h>
#include "gdb_wait.h"
#ifdef HAVE_MACHINE_REG_H
#include <machine/reg.h>
#endif

#include "sparc-tdep.h"
#include "sparc-nat.h"
#include "inf-ptrace.h"

/* With some trickery we can use the code in this file for most (if
   not all) ptrace(2) based SPARC systems, which includes SunOS 4,
   GNU/Linux and the various SPARC BSD's.

   First, we need a data structure for use with ptrace(2).  SunOS has
   `struct regs' and `struct fp_status' in <machine/reg.h>.  BSD's
   have `struct reg' and `struct fpreg' in <machine/reg.h>.  GNU/Linux
   has the same structures as SunOS 4, but they're in <asm/reg.h>,
   which is a kernel header.  As a general rule we avoid including
   GNU/Linux kernel headers.  Fortunately GNU/Linux has a `gregset_t'
   and a `fpregset_t' that are equivalent to `struct regs' and `struct
   fp_status' in <sys/ucontext.h>, which is automatically included by
   <signal.h>.  Settling on using the `gregset_t' and `fpregset_t'
   typedefs, providing them for the other systems, therefore solves
   the puzzle.  */

#ifdef HAVE_MACHINE_REG_H
#ifdef HAVE_STRUCT_REG
typedef struct reg gregset_t;
typedef struct fpreg fpregset_t;
#else 
typedef struct regs gregset_t;
typedef struct fp_status fpregset_t;
#endif
#endif

/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
   equivalents.  GNU/Linux already follows SunOS here.  */

#ifndef PTRACE_GETREGS
#define PTRACE_GETREGS PT_GETREGS
#endif

#ifndef PTRACE_SETREGS
#define PTRACE_SETREGS PT_SETREGS
#endif

#ifndef PTRACE_GETFPREGS
#define PTRACE_GETFPREGS PT_GETFPREGS
#endif

#ifndef PTRACE_SETFPREGS
#define PTRACE_SETFPREGS PT_SETFPREGS
#endif

/* Register set description.  */
const struct sparc_gregset *sparc_gregset;
void (*sparc_supply_gregset) (const struct sparc_gregset *,
			      struct regcache *, int , const void *);
void (*sparc_collect_gregset) (const struct sparc_gregset *,
			       const struct regcache *, int, void *);
void (*sparc_supply_fpregset) (struct regcache *, int , const void *);
void (*sparc_collect_fpregset) (const struct regcache *, int , void *);
int (*sparc_gregset_supplies_p) (int);
int (*sparc_fpregset_supplies_p) (int);

/* Determine whether `gregset_t' contains register REGNUM.  */

int
sparc32_gregset_supplies_p (int regnum)
{
  /* Integer registers.  */
  if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
      || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
      || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
      || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
    return 1;

  /* Control registers.  */
  if (regnum == SPARC32_PC_REGNUM
      || regnum == SPARC32_NPC_REGNUM
      || regnum == SPARC32_PSR_REGNUM
      || regnum == SPARC32_Y_REGNUM)
    return 1;

  return 0;
}

/* Determine whether `fpregset_t' contains register REGNUM.  */

int
sparc32_fpregset_supplies_p (int regnum)
{
  /* Floating-point registers.  */
  if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
    return 1;

  /* Control registers.  */
  if (regnum == SPARC32_FSR_REGNUM)
    return 1;

  return 0;
}

/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
   for all registers (including the floating-point registers).  */

void
sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
  int pid;

  /* NOTE: cagney/2002-12-03: This code assumes that the currently
     selected light weight processes' registers can be written
     directly into the selected thread's register cache.  This works
     fine when given an 1:1 LWP:thread model (such as found on
     GNU/Linux) but will, likely, have problems when used on an N:1
     (userland threads) or N:M (userland multiple LWP) model.  In the
     case of the latter two, the LWP's registers do not necessarily
     belong to the selected thread (the LWP could be in the middle of
     executing the thread switch code).

     These functions should instead be paramaterized with an explicit
     object (struct regcache, struct thread_info?) into which the LWPs
     registers can be written.  */
  pid = TIDGET (inferior_ptid);
  if (pid == 0)
    pid = PIDGET (inferior_ptid);

  if (regnum == SPARC_G0_REGNUM)
    {
      regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
      return;
    }

  if (regnum == -1 || sparc_gregset_supplies_p (regnum))
    {
      gregset_t regs;

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

      sparc_supply_gregset (sparc_gregset, regcache, -1, &regs);
      if (regnum != -1)
	return;
    }

  if (regnum == -1 || sparc_fpregset_supplies_p (regnum))
    {
      fpregset_t fpregs;

      if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      sparc_supply_fpregset (regcache, -1, &fpregs);
    }
}

void
sparc_store_inferior_registers (struct regcache *regcache, int regnum)
{
  int pid;

  /* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
     about threaded assumptions.  */
  pid = TIDGET (inferior_ptid);
  if (pid == 0)
    pid = PIDGET (inferior_ptid);

  if (regnum == -1 || sparc_gregset_supplies_p (regnum))
    {
      gregset_t regs;

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

      sparc_collect_gregset (sparc_gregset, regcache, regnum, &regs);

      if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't write registers"));

      /* Deal with the stack regs.  */
      if (regnum == -1 || regnum == SPARC_SP_REGNUM
	  || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
	{
	  ULONGEST sp;

	  regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
	  sparc_collect_rwindow (regcache, sp, regnum);
	}

      if (regnum != -1)
	return;
    }

  if (regnum == -1 || sparc_fpregset_supplies_p (regnum))
    {
      fpregset_t fpregs, saved_fpregs;

      if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating-point registers"));

      memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
      sparc_collect_fpregset (regcache, regnum, &fpregs);

      /* Writing the floating-point registers will fail on NetBSD with
	 EINVAL if the inferior process doesn't have an FPU state
	 (i.e. if it didn't use the FPU yet).  Therefore we don't try
	 to write the registers if nothing changed.  */
      if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
	{
	  if (ptrace (PTRACE_SETFPREGS, pid,
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't write floating-point registers"));
	}

      if (regnum != -1)
	return;
    }
}

\f
/* Fetch StackGhost Per-Process XOR cookie.  */

LONGEST
sparc_xfer_wcookie (struct target_ops *ops, enum target_object object,
		    const char *annex, gdb_byte *readbuf,
		    const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
  unsigned long wcookie = 0;
  char *buf = (char *)&wcookie;

  gdb_assert (object == TARGET_OBJECT_WCOOKIE);
  gdb_assert (readbuf && writebuf == NULL);

  if (offset == sizeof (unsigned long))
    return 0;			/* Signal EOF.  */
  if (offset > sizeof (unsigned long))
    return -1;

#ifdef PT_WCOOKIE
  /* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
     running on an OpenBSD release that uses StackGhost (3.1 or
     later).  Since release 3.6, OpenBSD uses a fully randomized
     cookie.  */
  {
    int pid;

    pid = TIDGET (inferior_ptid);
    if (pid == 0)
      pid = PIDGET (inferior_ptid);

    /* Sanity check.  The proper type for a cookie is register_t, but
       we can't assume that this type exists on all systems supported
       by the code in this file.  */
    gdb_assert (sizeof (wcookie) == sizeof (register_t));

    /* Fetch the cookie.  */
    if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
      {
	if (errno != EINVAL)
	  perror_with_name (_("Couldn't get StackGhost cookie"));

	/* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
	   the request wasn't implemented until after OpenBSD 3.4.  If
	   the kernel doesn't support the PT_WCOOKIE request, assume
	   we're running on a kernel that uses non-randomized cookies.  */
	wcookie = 0x3;
      }
  }
#endif /* PT_WCOOKIE */

  if (len > sizeof (unsigned long) - offset)
    len = sizeof (unsigned long) - offset;

  memcpy (readbuf, buf + offset, len);
  return len;
}

LONGEST (*inf_ptrace_xfer_partial) (struct target_ops *, enum target_object,
				    const char *, gdb_byte *, const gdb_byte *,
				    ULONGEST, LONGEST);

static LONGEST
sparc_xfer_partial (struct target_ops *ops, enum target_object object,
		    const char *annex, gdb_byte *readbuf,
		    const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
  if (object == TARGET_OBJECT_WCOOKIE)
    return sparc_xfer_wcookie (ops, object, annex, readbuf, writebuf, 
			       offset, len);

  return inf_ptrace_xfer_partial (ops, object, annex, readbuf, writebuf,
				  offset, len);
}
\f
/* Create a prototype generic SPARC target.  The client can override
   it with local methods.  */

struct target_ops *
sparc_target (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = sparc_fetch_inferior_registers;
  t->to_store_registers = sparc_store_inferior_registers;
  inf_ptrace_xfer_partial = t->to_xfer_partial;
  t->to_xfer_partial = sparc_xfer_partial;
  return t;
}

\f
/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_sparc_nat (void);

void
_initialize_sparc_nat (void)
{
  /* Deafult to using SunOS 4 register sets.  */
  if (sparc_gregset == NULL)
    sparc_gregset = &sparc32_sunos4_gregset;
  if (sparc_supply_gregset == NULL)
    sparc_supply_gregset = sparc32_supply_gregset;
  if (sparc_collect_gregset == NULL)
    sparc_collect_gregset = sparc32_collect_gregset;
  if (sparc_supply_fpregset == NULL)
    sparc_supply_fpregset = sparc32_supply_fpregset;
  if (sparc_collect_fpregset == NULL)
    sparc_collect_fpregset = sparc32_collect_fpregset;
  if (sparc_gregset_supplies_p == NULL)
    sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
  if (sparc_fpregset_supplies_p == NULL)
    sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
}
Commit	Line	Data
386c036b	1	/* Native-dependent code for SPARC.
2555fe1a	2
0fb0cc75 JB	3	Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
0fb0cc75 JB	4	Free Software Foundation, Inc.
c906108c	5
c5aa993b	6	This file is part of GDB.
c906108c	7
c5aa993b JM	8	This program is free software; you can redistribute it and/or modify
c5aa993b JM	9	it under the terms of the GNU General Public License as published by
a9762ec7	10	the Free Software Foundation; either version 3 of the License, or
c5aa993b	11	(at your option) any later version.
c906108c	12
c5aa993b JM	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.
c906108c	17
c5aa993b	18	You should have received a copy of the GNU General Public License
a9762ec7	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
c906108c SS	20
	21	#include "defs.h"
	22	#include "inferior.h"
4e052eda	23	#include "regcache.h"
baf92889	24	#include "target.h"
c906108c	25
baf92889	26	#include "gdb_assert.h"
c906108c	27	#include <signal.h>
386c036b	28	#include "gdb_string.h"
c906108c	29	#include <sys/ptrace.h>
2555fe1a	30	#include "gdb_wait.h"
386c036b	31	#ifdef HAVE_MACHINE_REG_H
c906108c SS	32	#include <machine/reg.h>
c906108c SS	33	#endif
c906108c	34
386c036b MK	35	#include "sparc-tdep.h"
386c036b MK	36	#include "sparc-nat.h"
1b9445c2	37	#include "inf-ptrace.h"
386c036b MK	38
	39	/* With some trickery we can use the code in this file for most (if
	40	not all) ptrace(2) based SPARC systems, which includes SunOS 4,
1a111ce3	41	GNU/Linux and the various SPARC BSD's.
386c036b MK	42
	43	First, we need a data structure for use with ptrace(2). SunOS has
	44	`struct regs' and `struct fp_status' in <machine/reg.h>. BSD's
	45	have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux
	46	has the same structures as SunOS 4, but they're in <asm/reg.h>,
	47	which is a kernel header. As a general rule we avoid including
	48	GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t'
	49	and a `fpregset_t' that are equivalent to `struct regs' and `struct
	50	fp_status' in <sys/ucontext.h>, which is automatically included by
	51	<signal.h>. Settling on using the `gregset_t' and `fpregset_t'
	52	typedefs, providing them for the other systems, therefore solves
	53	the puzzle. */
	54
	55	#ifdef HAVE_MACHINE_REG_H
	56	#ifdef HAVE_STRUCT_REG
	57	typedef struct reg gregset_t;
	58	typedef struct fpreg fpregset_t;
	59	#else
	60	typedef struct regs gregset_t;
	61	typedef struct fp_status fpregset_t;
	62	#endif
	63	#endif
	64
	65	/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
	66	equivalents. GNU/Linux already follows SunOS here. */
c906108c	67
386c036b MK	68	#ifndef PTRACE_GETREGS
	69	#define PTRACE_GETREGS PT_GETREGS
	70	#endif
	71
	72	#ifndef PTRACE_SETREGS
	73	#define PTRACE_SETREGS PT_SETREGS
	74	#endif
c906108c	75
386c036b MK	76	#ifndef PTRACE_GETFPREGS
	77	#define PTRACE_GETFPREGS PT_GETFPREGS
	78	#endif
	79
	80	#ifndef PTRACE_SETFPREGS
	81	#define PTRACE_SETFPREGS PT_SETFPREGS
	82	#endif
	83
	84	/* Register set description. */
	85	const struct sparc_gregset *sparc_gregset;
	86	void (sparc_supply_gregset) (const struct sparc_gregset ,
	87	struct regcache , int , const void );
	88	void (sparc_collect_gregset) (const struct sparc_gregset ,
	89	const struct regcache , int, void );
	90	void (sparc_supply_fpregset) (struct regcache , int , const void *);
	91	void (sparc_collect_fpregset) (const struct regcache , int , void *);
	92	int (*sparc_gregset_supplies_p) (int);
	93	int (*sparc_fpregset_supplies_p) (int);
	94
	95	/* Determine whether `gregset_t' contains register REGNUM. */
	96
	97	int
	98	sparc32_gregset_supplies_p (int regnum)
	99	{
	100	/* Integer registers. */
	101	if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
	102	\|\| (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
	103	\|\| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
	104	\|\| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
	105	return 1;
	106
	107	/* Control registers. */
	108	if (regnum == SPARC32_PC_REGNUM
	109	\|\| regnum == SPARC32_NPC_REGNUM
	110	\|\| regnum == SPARC32_PSR_REGNUM
	111	\|\| regnum == SPARC32_Y_REGNUM)
	112	return 1;
	113
	114	return 0;
	115	}
	116
	117	/* Determine whether `fpregset_t' contains register REGNUM. */
	118
	119	int
	120	sparc32_fpregset_supplies_p (int regnum)
	121	{
	122	/* Floating-point registers. */
	123	if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
	124	return 1;
	125
	126	/* Control registers. */
	127	if (regnum == SPARC32_FSR_REGNUM)
	128	return 1;
	129
	130	return 0;
	131	}
	132
	133	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
	134	for all registers (including the floating-point registers). */
c906108c SS	135
c906108c SS	136	void
6f7a27d5	137	sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
c906108c	138	{
386c036b	139	int pid;
02ae7771 AC	140
	141	/* NOTE: cagney/2002-12-03: This code assumes that the currently
	142	selected light weight processes' registers can be written
	143	directly into the selected thread's register cache. This works
	144	fine when given an 1:1 LWP:thread model (such as found on
	145	GNU/Linux) but will, likely, have problems when used on an N:1
	146	(userland threads) or N:M (userland multiple LWP) model. In the
	147	case of the latter two, the LWP's registers do not necessarily
	148	belong to the selected thread (the LWP could be in the middle of
	149	executing the thread switch code).
	150
	151	These functions should instead be paramaterized with an explicit
	152	object (struct regcache, struct thread_info?) into which the LWPs
	153	registers can be written. */
386c036b MK	154	pid = TIDGET (inferior_ptid);
	155	if (pid == 0)
	156	pid = PIDGET (inferior_ptid);
02ae7771	157
386c036b	158	if (regnum == SPARC_G0_REGNUM)
c906108c	159	{
386c036b MK	160	regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
386c036b MK	161	return;
c906108c SS	162	}
c906108c SS	163
386c036b	164	if (regnum == -1 \|\| sparc_gregset_supplies_p (regnum))
c906108c	165	{
386c036b	166	gregset_t regs;
c906108c	167
49ec097f	168	if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	169	perror_with_name (_("Couldn't get registers"));
386c036b MK	170
	171	sparc_supply_gregset (sparc_gregset, regcache, -1, &regs);
	172	if (regnum != -1)
	173	return;
c906108c	174	}
386c036b MK	175
386c036b MK	176	if (regnum == -1 \|\| sparc_fpregset_supplies_p (regnum))
c906108c	177	{
386c036b MK	178	fpregset_t fpregs;
386c036b MK	179
49ec097f	180	if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	181	perror_with_name (_("Couldn't get floating point status"));
386c036b MK	182
386c036b MK	183	sparc_supply_fpregset (regcache, -1, &fpregs);
c906108c SS	184	}
	185	}
	186
c906108c	187	void
6f7a27d5	188	sparc_store_inferior_registers (struct regcache *regcache, int regnum)
c906108c	189	{
386c036b	190	int pid;
02ae7771 AC	191
	192	/* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
	193	about threaded assumptions. */
386c036b MK	194	pid = TIDGET (inferior_ptid);
	195	if (pid == 0)
	196	pid = PIDGET (inferior_ptid);
c906108c	197
386c036b	198	if (regnum == -1 \|\| sparc_gregset_supplies_p (regnum))
e1925118	199	{
386c036b	200	gregset_t regs;
c906108c	201
49ec097f	202	if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	203	perror_with_name (_("Couldn't get registers"));
c906108c	204
386c036b	205	sparc_collect_gregset (sparc_gregset, regcache, regnum, &regs);
c906108c	206
49ec097f	207	if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	208	perror_with_name (_("Couldn't write registers"));
c5aa993b	209
386c036b MK	210	/* Deal with the stack regs. */
	211	if (regnum == -1 \|\| regnum == SPARC_SP_REGNUM
	212	\|\| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
	213	{
	214	ULONGEST sp;
c906108c	215
386c036b MK	216	regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
	217	sparc_collect_rwindow (regcache, sp, regnum);
	218	}
c906108c	219
386c036b MK	220	if (regnum != -1)
386c036b MK	221	return;
c906108c	222	}
c906108c	223
386c036b	224	if (regnum == -1 \|\| sparc_fpregset_supplies_p (regnum))
c5aa993b	225	{
386c036b	226	fpregset_t fpregs, saved_fpregs;
c906108c	227
49ec097f	228	if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	229	perror_with_name (_("Couldn't get floating-point registers"));
c906108c	230
386c036b MK	231	memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
386c036b MK	232	sparc_collect_fpregset (regcache, regnum, &fpregs);
c906108c	233
386c036b MK	234	/* Writing the floating-point registers will fail on NetBSD with
	235	EINVAL if the inferior process doesn't have an FPU state
	236	(i.e. if it didn't use the FPU yet). Therefore we don't try
	237	to write the registers if nothing changed. */
	238	if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
c5aa993b	239	{
386c036b	240	if (ptrace (PTRACE_SETFPREGS, pid,
49ec097f	241	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	242	perror_with_name (_("Couldn't write floating-point registers"));
c5aa993b	243	}
c906108c	244
386c036b MK	245	if (regnum != -1)
	246	return;
	247	}
c906108c	248	}
baf92889	249
c906108c	250	\f
baf92889 MK	251	/* Fetch StackGhost Per-Process XOR cookie. */
	252
	253	LONGEST
	254	sparc_xfer_wcookie (struct target_ops *ops, enum target_object object,
961cb7b5 MK	255	const char annex, gdb_byte readbuf,
961cb7b5 MK	256	const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
baf92889 MK	257	{
	258	unsigned long wcookie = 0;
	259	char buf = (char )&wcookie;
	260
	261	gdb_assert (object == TARGET_OBJECT_WCOOKIE);
	262	gdb_assert (readbuf && writebuf == NULL);
	263
2c9771d3 MK	264	if (offset == sizeof (unsigned long))
	265	return 0; /* Signal EOF. */
	266	if (offset > sizeof (unsigned long))
baf92889	267	return -1;
c5aa993b	268
baf92889 MK	269	#ifdef PT_WCOOKIE
	270	/* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
	271	running on an OpenBSD release that uses StackGhost (3.1 or
2c9771d3 MK	272	later). Since release 3.6, OpenBSD uses a fully randomized
2c9771d3 MK	273	cookie. */
645d6d10 MK	274	{
	275	int pid;
	276
	277	pid = TIDGET (inferior_ptid);
	278	if (pid == 0)
	279	pid = PIDGET (inferior_ptid);
	280
	281	/* Sanity check. The proper type for a cookie is register_t, but
	282	we can't assume that this type exists on all systems supported
	283	by the code in this file. */
	284	gdb_assert (sizeof (wcookie) == sizeof (register_t));
	285
	286	/* Fetch the cookie. */
49ec097f	287	if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
645d6d10 MK	288	{
645d6d10 MK	289	if (errno != EINVAL)
e2e0b3e5	290	perror_with_name (_("Couldn't get StackGhost cookie"));
645d6d10 MK	291
	292	/* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
	293	the request wasn't implemented until after OpenBSD 3.4. If
	294	the kernel doesn't support the PT_WCOOKIE request, assume
	295	we're running on a kernel that uses non-randomized cookies. */
	296	wcookie = 0x3;
	297	}
	298	}
baf92889 MK	299	#endif /* PT_WCOOKIE */
	300
	301	if (len > sizeof (unsigned long) - offset)
	302	len = sizeof (unsigned long) - offset;
	303
	304	memcpy (readbuf, buf + offset, len);
	305	return len;
	306	}
cbfc58d1 MK	307
cbfc58d1 MK	308	LONGEST (inf_ptrace_xfer_partial) (struct target_ops , enum target_object,
961cb7b5	309	const char , gdb_byte , const gdb_byte *,
cbfc58d1 MK	310	ULONGEST, LONGEST);
	311
	312	static LONGEST
	313	sparc_xfer_partial (struct target_ops *ops, enum target_object object,
961cb7b5 MK	314	const char annex, gdb_byte readbuf,
961cb7b5 MK	315	const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
cbfc58d1 MK	316	{
	317	if (object == TARGET_OBJECT_WCOOKIE)
	318	return sparc_xfer_wcookie (ops, object, annex, readbuf, writebuf,
	319	offset, len);
	320
	321	return inf_ptrace_xfer_partial (ops, object, annex, readbuf, writebuf,
	322	offset, len);
	323	}
1b9445c2 MK	324	\f
	325	/* Create a prototype generic SPARC target. The client can override
	326	it with local methods. */
	327
	328	struct target_ops *
	329	sparc_target (void)
	330	{
	331	struct target_ops *t;
	332
	333	t = inf_ptrace_target ();
6f7a27d5 UW	334	t->to_fetch_registers = sparc_fetch_inferior_registers;
6f7a27d5 UW	335	t->to_store_registers = sparc_store_inferior_registers;
cbfc58d1 MK	336	inf_ptrace_xfer_partial = t->to_xfer_partial;
cbfc58d1 MK	337	t->to_xfer_partial = sparc_xfer_partial;
1b9445c2 MK	338	return t;
1b9445c2 MK	339	}
baf92889 MK	340
baf92889 MK	341	\f
386c036b MK	342	/* Provide a prototype to silence -Wmissing-prototypes. */
386c036b MK	343	void _initialize_sparc_nat (void);
c906108c SS	344
c906108c SS	345	void
386c036b	346	_initialize_sparc_nat (void)
c906108c	347	{
386c036b MK	348	/* Deafult to using SunOS 4 register sets. */
	349	if (sparc_gregset == NULL)
	350	sparc_gregset = &sparc32_sunos4_gregset;
	351	if (sparc_supply_gregset == NULL)
	352	sparc_supply_gregset = sparc32_supply_gregset;
	353	if (sparc_collect_gregset == NULL)
	354	sparc_collect_gregset = sparc32_collect_gregset;
	355	if (sparc_supply_fpregset == NULL)
	356	sparc_supply_fpregset = sparc32_supply_fpregset;
	357	if (sparc_collect_fpregset == NULL)
	358	sparc_collect_fpregset = sparc32_collect_fpregset;
	359	if (sparc_gregset_supplies_p == NULL)
	360	sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
	361	if (sparc_fpregset_supplies_p == NULL)
	362	sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
c906108c	363	}