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

/* Native-dependent code for SPARC.

   Copyright (C) 2003, 2004, 2005, 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 "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
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
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 = fetch_inferior_registers;
  t->to_store_registers = 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
6aba47ca	3	Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
c906108c	4
c5aa993b	5	This file is part of GDB.
c906108c	6
c5aa993b JM	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 2 of the License, or
	10	(at your option) any later version.
c906108c	11
c5aa993b JM	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.
c906108c	16
c5aa993b JM	17	You should have received a copy of the GNU General Public License
c5aa993b JM	18	along with this program; if not, write to the Free Software
197e01b6 EZ	19	Foundation, Inc., 51 Franklin Street, Fifth Floor,
197e01b6 EZ	20	Boston, MA 02110-1301, USA. */
c906108c SS	21
	22	#include "defs.h"
	23	#include "inferior.h"
4e052eda	24	#include "regcache.h"
baf92889	25	#include "target.h"
c906108c	26
baf92889	27	#include "gdb_assert.h"
c906108c	28	#include <signal.h>
386c036b	29	#include "gdb_string.h"
c906108c	30	#include <sys/ptrace.h>
2555fe1a	31	#include "gdb_wait.h"
386c036b	32	#ifdef HAVE_MACHINE_REG_H
c906108c SS	33	#include <machine/reg.h>
c906108c SS	34	#endif
c906108c	35
386c036b MK	36	#include "sparc-tdep.h"
386c036b MK	37	#include "sparc-nat.h"
1b9445c2	38	#include "inf-ptrace.h"
386c036b MK	39
	40	/* With some trickery we can use the code in this file for most (if
	41	not all) ptrace(2) based SPARC systems, which includes SunOS 4,
1a111ce3	42	GNU/Linux and the various SPARC BSD's.
386c036b MK	43
	44	First, we need a data structure for use with ptrace(2). SunOS has
	45	`struct regs' and `struct fp_status' in <machine/reg.h>. BSD's
	46	have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux
	47	has the same structures as SunOS 4, but they're in <asm/reg.h>,
	48	which is a kernel header. As a general rule we avoid including
	49	GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t'
	50	and a `fpregset_t' that are equivalent to `struct regs' and `struct
	51	fp_status' in <sys/ucontext.h>, which is automatically included by
	52	<signal.h>. Settling on using the `gregset_t' and `fpregset_t'
	53	typedefs, providing them for the other systems, therefore solves
	54	the puzzle. */
	55
	56	#ifdef HAVE_MACHINE_REG_H
	57	#ifdef HAVE_STRUCT_REG
	58	typedef struct reg gregset_t;
	59	typedef struct fpreg fpregset_t;
	60	#else
	61	typedef struct regs gregset_t;
	62	typedef struct fp_status fpregset_t;
	63	#endif
	64	#endif
	65
	66	/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
	67	equivalents. GNU/Linux already follows SunOS here. */
c906108c	68
386c036b MK	69	#ifndef PTRACE_GETREGS
	70	#define PTRACE_GETREGS PT_GETREGS
	71	#endif
	72
	73	#ifndef PTRACE_SETREGS
	74	#define PTRACE_SETREGS PT_SETREGS
	75	#endif
c906108c	76
386c036b MK	77	#ifndef PTRACE_GETFPREGS
	78	#define PTRACE_GETFPREGS PT_GETFPREGS
	79	#endif
	80
	81	#ifndef PTRACE_SETFPREGS
	82	#define PTRACE_SETFPREGS PT_SETFPREGS
	83	#endif
	84
	85	/* Register set description. */
	86	const struct sparc_gregset *sparc_gregset;
	87	void (sparc_supply_gregset) (const struct sparc_gregset ,
	88	struct regcache , int , const void );
	89	void (sparc_collect_gregset) (const struct sparc_gregset ,
	90	const struct regcache , int, void );
	91	void (sparc_supply_fpregset) (struct regcache , int , const void *);
	92	void (sparc_collect_fpregset) (const struct regcache , int , void *);
	93	int (*sparc_gregset_supplies_p) (int);
	94	int (*sparc_fpregset_supplies_p) (int);
	95
	96	/* Determine whether `gregset_t' contains register REGNUM. */
	97
	98	int
	99	sparc32_gregset_supplies_p (int regnum)
	100	{
	101	/* Integer registers. */
	102	if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
	103	\|\| (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
	104	\|\| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
	105	\|\| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
	106	return 1;
	107
	108	/* Control registers. */
	109	if (regnum == SPARC32_PC_REGNUM
	110	\|\| regnum == SPARC32_NPC_REGNUM
	111	\|\| regnum == SPARC32_PSR_REGNUM
	112	\|\| regnum == SPARC32_Y_REGNUM)
	113	return 1;
	114
	115	return 0;
	116	}
	117
	118	/* Determine whether `fpregset_t' contains register REGNUM. */
	119
	120	int
	121	sparc32_fpregset_supplies_p (int regnum)
	122	{
	123	/* Floating-point registers. */
	124	if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
	125	return 1;
	126
	127	/* Control registers. */
	128	if (regnum == SPARC32_FSR_REGNUM)
	129	return 1;
	130
	131	return 0;
	132	}
	133
	134	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
	135	for all registers (including the floating-point registers). */
c906108c SS	136
c906108c SS	137	void
56be3814	138	fetch_inferior_registers (struct regcache *regcache, int regnum)
c906108c	139	{
386c036b	140	int pid;
02ae7771 AC	141
	142	/* NOTE: cagney/2002-12-03: This code assumes that the currently
	143	selected light weight processes' registers can be written
	144	directly into the selected thread's register cache. This works
	145	fine when given an 1:1 LWP:thread model (such as found on
	146	GNU/Linux) but will, likely, have problems when used on an N:1
	147	(userland threads) or N:M (userland multiple LWP) model. In the
	148	case of the latter two, the LWP's registers do not necessarily
	149	belong to the selected thread (the LWP could be in the middle of
	150	executing the thread switch code).
	151
	152	These functions should instead be paramaterized with an explicit
	153	object (struct regcache, struct thread_info?) into which the LWPs
	154	registers can be written. */
386c036b MK	155	pid = TIDGET (inferior_ptid);
	156	if (pid == 0)
	157	pid = PIDGET (inferior_ptid);
02ae7771	158
386c036b	159	if (regnum == SPARC_G0_REGNUM)
c906108c	160	{
386c036b MK	161	regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
386c036b MK	162	return;
c906108c SS	163	}
c906108c SS	164
386c036b	165	if (regnum == -1 \|\| sparc_gregset_supplies_p (regnum))
c906108c	166	{
386c036b	167	gregset_t regs;
c906108c	168
49ec097f	169	if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	170	perror_with_name (_("Couldn't get registers"));
386c036b MK	171
	172	sparc_supply_gregset (sparc_gregset, regcache, -1, &regs);
	173	if (regnum != -1)
	174	return;
c906108c	175	}
386c036b MK	176
386c036b MK	177	if (regnum == -1 \|\| sparc_fpregset_supplies_p (regnum))
c906108c	178	{
386c036b MK	179	fpregset_t fpregs;
386c036b MK	180
49ec097f	181	if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	182	perror_with_name (_("Couldn't get floating point status"));
386c036b MK	183
386c036b MK	184	sparc_supply_fpregset (regcache, -1, &fpregs);
c906108c SS	185	}
	186	}
	187
c906108c	188	void
56be3814	189	store_inferior_registers (struct regcache *regcache, int regnum)
c906108c	190	{
386c036b	191	int pid;
02ae7771 AC	192
	193	/* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
	194	about threaded assumptions. */
386c036b MK	195	pid = TIDGET (inferior_ptid);
	196	if (pid == 0)
	197	pid = PIDGET (inferior_ptid);
c906108c	198
386c036b	199	if (regnum == -1 \|\| sparc_gregset_supplies_p (regnum))
e1925118	200	{
386c036b	201	gregset_t regs;
c906108c	202
49ec097f	203	if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	204	perror_with_name (_("Couldn't get registers"));
c906108c	205
386c036b	206	sparc_collect_gregset (sparc_gregset, regcache, regnum, &regs);
c906108c	207
49ec097f	208	if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	209	perror_with_name (_("Couldn't write registers"));
c5aa993b	210
386c036b MK	211	/* Deal with the stack regs. */
	212	if (regnum == -1 \|\| regnum == SPARC_SP_REGNUM
	213	\|\| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
	214	{
	215	ULONGEST sp;
c906108c	216
386c036b MK	217	regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
	218	sparc_collect_rwindow (regcache, sp, regnum);
	219	}
c906108c	220
386c036b MK	221	if (regnum != -1)
386c036b MK	222	return;
c906108c	223	}
c906108c	224
386c036b	225	if (regnum == -1 \|\| sparc_fpregset_supplies_p (regnum))
c5aa993b	226	{
386c036b	227	fpregset_t fpregs, saved_fpregs;
c906108c	228
49ec097f	229	if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	230	perror_with_name (_("Couldn't get floating-point registers"));
c906108c	231
386c036b MK	232	memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
386c036b MK	233	sparc_collect_fpregset (regcache, regnum, &fpregs);
c906108c	234
386c036b MK	235	/* Writing the floating-point registers will fail on NetBSD with
	236	EINVAL if the inferior process doesn't have an FPU state
	237	(i.e. if it didn't use the FPU yet). Therefore we don't try
	238	to write the registers if nothing changed. */
	239	if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
c5aa993b	240	{
386c036b	241	if (ptrace (PTRACE_SETFPREGS, pid,
49ec097f	242	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	243	perror_with_name (_("Couldn't write floating-point registers"));
c5aa993b	244	}
c906108c	245
386c036b MK	246	if (regnum != -1)
	247	return;
	248	}
c906108c	249	}
baf92889	250
c906108c	251	\f
baf92889 MK	252	/* Fetch StackGhost Per-Process XOR cookie. */
	253
	254	LONGEST
	255	sparc_xfer_wcookie (struct target_ops *ops, enum target_object object,
961cb7b5 MK	256	const char annex, gdb_byte readbuf,
961cb7b5 MK	257	const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
baf92889 MK	258	{
	259	unsigned long wcookie = 0;
	260	char buf = (char )&wcookie;
	261
	262	gdb_assert (object == TARGET_OBJECT_WCOOKIE);
	263	gdb_assert (readbuf && writebuf == NULL);
	264
2c9771d3 MK	265	if (offset == sizeof (unsigned long))
	266	return 0; /* Signal EOF. */
	267	if (offset > sizeof (unsigned long))
baf92889	268	return -1;
c5aa993b	269
baf92889 MK	270	#ifdef PT_WCOOKIE
	271	/* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
	272	running on an OpenBSD release that uses StackGhost (3.1 or
2c9771d3 MK	273	later). Since release 3.6, OpenBSD uses a fully randomized
2c9771d3 MK	274	cookie. */
645d6d10 MK	275	{
	276	int pid;
	277
	278	pid = TIDGET (inferior_ptid);
	279	if (pid == 0)
	280	pid = PIDGET (inferior_ptid);
	281
	282	/* Sanity check. The proper type for a cookie is register_t, but
	283	we can't assume that this type exists on all systems supported
	284	by the code in this file. */
	285	gdb_assert (sizeof (wcookie) == sizeof (register_t));
	286
	287	/* Fetch the cookie. */
49ec097f	288	if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
645d6d10 MK	289	{
645d6d10 MK	290	if (errno != EINVAL)
e2e0b3e5	291	perror_with_name (_("Couldn't get StackGhost cookie"));
645d6d10 MK	292
	293	/* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
	294	the request wasn't implemented until after OpenBSD 3.4. If
	295	the kernel doesn't support the PT_WCOOKIE request, assume
	296	we're running on a kernel that uses non-randomized cookies. */
	297	wcookie = 0x3;
	298	}
	299	}
baf92889 MK	300	#endif /* PT_WCOOKIE */
	301
	302	if (len > sizeof (unsigned long) - offset)
	303	len = sizeof (unsigned long) - offset;
	304
	305	memcpy (readbuf, buf + offset, len);
	306	return len;
	307	}
cbfc58d1 MK	308
cbfc58d1 MK	309	LONGEST (inf_ptrace_xfer_partial) (struct target_ops , enum target_object,
961cb7b5	310	const char , gdb_byte , const gdb_byte *,
cbfc58d1 MK	311	ULONGEST, LONGEST);
	312
	313	static LONGEST
	314	sparc_xfer_partial (struct target_ops *ops, enum target_object object,
961cb7b5 MK	315	const char annex, gdb_byte readbuf,
961cb7b5 MK	316	const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
cbfc58d1 MK	317	{
	318	if (object == TARGET_OBJECT_WCOOKIE)
	319	return sparc_xfer_wcookie (ops, object, annex, readbuf, writebuf,
	320	offset, len);
	321
	322	return inf_ptrace_xfer_partial (ops, object, annex, readbuf, writebuf,
	323	offset, len);
	324	}
1b9445c2 MK	325	\f
	326	/* Create a prototype generic SPARC target. The client can override
	327	it with local methods. */
	328
	329	struct target_ops *
	330	sparc_target (void)
	331	{
	332	struct target_ops *t;
	333
	334	t = inf_ptrace_target ();
	335	t->to_fetch_registers = fetch_inferior_registers;
	336	t->to_store_registers = store_inferior_registers;
cbfc58d1 MK	337	inf_ptrace_xfer_partial = t->to_xfer_partial;
cbfc58d1 MK	338	t->to_xfer_partial = sparc_xfer_partial;
1b9445c2 MK	339	return t;
1b9445c2 MK	340	}
baf92889 MK	341
baf92889 MK	342	\f
386c036b MK	343	/* Provide a prototype to silence -Wmissing-prototypes. */
386c036b MK	344	void _initialize_sparc_nat (void);
c906108c SS	345
c906108c SS	346	void
386c036b	347	_initialize_sparc_nat (void)
c906108c	348	{
386c036b MK	349	/* Deafult to using SunOS 4 register sets. */
	350	if (sparc_gregset == NULL)
	351	sparc_gregset = &sparc32_sunos4_gregset;
	352	if (sparc_supply_gregset == NULL)
	353	sparc_supply_gregset = sparc32_supply_gregset;
	354	if (sparc_collect_gregset == NULL)
	355	sparc_collect_gregset = sparc32_collect_gregset;
	356	if (sparc_supply_fpregset == NULL)
	357	sparc_supply_fpregset = sparc32_supply_fpregset;
	358	if (sparc_collect_fpregset == NULL)
	359	sparc_collect_fpregset = sparc32_collect_fpregset;
	360	if (sparc_gregset_supplies_p == NULL)
	361	sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
	362	if (sparc_fpregset_supplies_p == NULL)
	363	sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
c906108c	364	}