[deliverable/binutils-gdb.git] / gdb / i386bsd-nat.c

/* Native-dependent code for modern i386 BSD's.
   Copyright 2000, 2001, 2002 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "inferior.h"
#include "regcache.h"

#include "gdb_assert.h"
#include <signal.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>

#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
#endif

#ifndef HAVE_GREGSET_T
typedef struct reg gregset_t;
#endif

#ifndef HAVE_FPREGSET_T
typedef struct fpreg fpregset_t;
#endif

#include "gregset.h"
#include "i386-tdep.h"
\f

/* In older BSD versions we cannot get at some of the segment
   registers.  FreeBSD for example didn't support the %fs and %gs
   registers until the 3.0 release.  We have autoconf checks for their
   presence, and deal gracefully with their absence.  */

/* Registers we shouldn't try to fetch.  */
#if !defined (CANNOT_FETCH_REGISTER)
#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
#endif

/* Registers we shouldn't try to store.  */
#if !defined (CANNOT_STORE_REGISTER)
#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
#endif

/* Offset to the gregset_t location where REG is stored.  */
#define REG_OFFSET(reg) offsetof (gregset_t, reg)

/* At reg_offset[REGNO] you'll find the offset to the gregset_t
   location where the GDB register REGNO is stored.  Unsupported
   registers are marked with `-1'.  */
static int reg_offset[] =
{
  REG_OFFSET (r_eax),
  REG_OFFSET (r_ecx),
  REG_OFFSET (r_edx),
  REG_OFFSET (r_ebx),
  REG_OFFSET (r_esp),
  REG_OFFSET (r_ebp),
  REG_OFFSET (r_esi),
  REG_OFFSET (r_edi),
  REG_OFFSET (r_eip),
  REG_OFFSET (r_eflags),
  REG_OFFSET (r_cs),
  REG_OFFSET (r_ss),
  REG_OFFSET (r_ds),
  REG_OFFSET (r_es),
#ifdef HAVE_STRUCT_REG_R_FS
  REG_OFFSET (r_fs),
#else
  -1,
#endif
#ifdef HAVE_STRUCT_REG_R_GS
  REG_OFFSET (r_gs)
#else
  -1
#endif
};

#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])

/* Macro to determine if a register is fetched with PT_GETREGS.  */
#define GETREGS_SUPPLIES(regno) \
  ((0 <= (regno) && (regno) <= 15))

#ifdef HAVE_PT_GETXMMREGS
/* Set to 1 if the kernel supports PT_GETXMMREGS.  Initialized to -1
   so that we try PT_GETXMMREGS the first time around.  */
static int have_ptrace_xmmregs = -1;
#endif

/* Return nonzero if we shouldn't try to fetch register REGNO.  */

static int
cannot_fetch_register (int regno)
{
  return (reg_offset[regno] == -1);
}
\f

/* Transfering the registers between GDB, inferiors and core files.  */

/* Fill GDB's register array with the general-purpose register values
   in *GREGSETP.  */

void
supply_gregset (gregset_t *gregsetp)
{
  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)
    {
      if (CANNOT_FETCH_REGISTER (i))
	supply_register (i, NULL);
      else
	supply_register (i, REG_ADDR (gregsetp, i));
    }
}

/* Fill register REGNO (if it is a general-purpose register) in
   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
   do this for all registers.  */

void
fill_gregset (gregset_t *gregsetp, int regno)
{
  int i;

  for (i = 0; i < I386_NUM_GREGS; i++)
    if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
      regcache_collect (i, REG_ADDR (gregsetp, i));
}

#include "i387-tdep.h"

/* Fill GDB's register array with the floating-point register values
   in *FPREGSETP.  */

void
supply_fpregset (fpregset_t *fpregsetp)
{
  i387_supply_fsave ((char *) fpregsetp);
}

/* Fill register REGNO (if it is a floating-point register) in
   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
   do this for all registers.  */

void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
  i387_fill_fsave ((char *) fpregsetp, regno);
}

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

void
fetch_inferior_registers (int regno)
{

  if (regno == -1 || GETREGS_SUPPLIES (regno))
    {
      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	perror_with_name ("Couldn't get registers");

      supply_gregset (&gregs);
      if (regno != -1)
	return;
    }

  if (regno == -1 || regno >= FP0_REGNUM)
    {
      fpregset_t fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0 &&
	  ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		 (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;
	  i387_supply_fxsave (xmmregs);
	}
      else
	{
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't get floating point status");

	  supply_fpregset (&fpregs);
	}
#else
      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	perror_with_name ("Couldn't get floating point status");

      supply_fpregset (&fpregs);
#endif
    }
}

/* Store register REGNO back into the inferior.  If REGNO is -1, do
   this for all registers (including the floating point registers).  */

void
store_inferior_registers (int regno)
{

  if (regno == -1 || GETREGS_SUPPLIES (regno))
    {
      gregset_t gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
                  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
        perror_with_name ("Couldn't get registers");

      fill_gregset (&gregs, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	          (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
        perror_with_name ("Couldn't write registers");

      if (regno != -1)
	return;
    }

  if (regno == -1 || regno >= FP0_REGNUM)
    {
      fpregset_t fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0 &&
	  ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		 (PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;

	  i387_fill_fxsave (xmmregs, regno);

	  if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
            perror_with_name ("Couldn't write XMM registers");
	}
      else
	{
	  have_ptrace_xmmregs = 0;
#endif
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't get floating point status");

          fill_fpregset (&fpregs, regno);
  
          if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	    perror_with_name ("Couldn't write floating point status");
#ifdef HAVE_PT_GETXMMREGS
        }
#endif
    }
}
\f

/* Support for debug registers.  */

#ifdef HAVE_PT_GETDBREGS

/* Not all versions of FreeBSD/i386 that support the debug registers
   have this macro.  */
#ifndef DBREG_DRX
#define DBREG_DRX(d, x) ((&d->dr0)[x])
#endif

static void
i386bsd_dr_set (int regnum, unsigned int value)
{
  struct dbreg dbregs;

  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
    perror_with_name ("Couldn't get debug registers");

  /* For some mysterious reason, some of the reserved bits in the
     debug control register get set.  Mask these off, otherwise the
     ptrace call below will fail.  */
  dbregs.dr7 &= ~(0x0000fc00);

  DBREG_DRX ((&dbregs), regnum) = value;

  if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
    perror_with_name ("Couldn't write debug registers");
}

void
i386bsd_dr_set_control (unsigned long control)
{
  i386bsd_dr_set (7, control);
}

void
i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, addr);
}

void
i386bsd_dr_reset_addr (int regnum)
{
  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, 0);
}

unsigned long
i386bsd_dr_get_status (void)
{
  struct dbreg dbregs;

  /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
     ptrace call fails breaks debugging remote targets.  The correct
     way to fix this is to add the hardware breakpoint and watchpoint
     stuff to the target vector.  For now, just return zero if the
     ptrace call fails.  */
  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
	      (PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
#if 0
    perror_with_name ("Couldn't read debug registers");
#else
    return 0;
#endif

  return dbregs.dr6;
}

#endif /* PT_GETDBREGS */
\f

/* Support for the user struct.  */

/* Return the address register REGNO.  BLOCKEND is the value of
   u.u_ar0, which should point to the registers.  */

CORE_ADDR
register_u_addr (CORE_ADDR blockend, int regno)
{
  return (CORE_ADDR) REG_ADDR (blockend, regno);
}

#include <sys/param.h>
#include <sys/user.h>

/* Return the size of the user struct.  */

int
kernel_u_size (void)
{
  return (sizeof (struct user));
}
\f
void
_initialize_i386bsd_nat (void)
{
  int sc_pc_offset;
  int sc_sp_offset;

  /* To support the recognition of signal handlers, i386bsd-tdep.c
     hardcodes some constants.  Inclusion of this file means that we
     are compiling a native debugger, which means that we can use the
     system header files and sysctl(3) to get at the relevant
     information.  */

#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
  extern int i386fbsd4_sc_pc_offset;
  extern int i386fbsd4_sc_sp_offset;
#define SC_PC_OFFSET i386fbsd4_sc_pc_offset
#define SC_SP_OFFSET i386fbsd4_sc_sp_offset
#elif defined (NetBSD) || defined (__NetBSD_Version__) || defined (OpenBSD)
  extern int i386nbsd_sc_pc_offset;
  extern int i386nbsd_sc_sp_offset;
#define SC_PC_OFFSET i386nbsd_sc_pc_offset
#define SC_SP_OFFSET i386nbsd_sc_sp_offset
#else
  extern int i386bsd_sc_pc_offset;
  extern int i386bsd_sc_sp_offset;
#define SC_PC_OFFSET i386bsd_sc_pc_offset
#define SC_SP_OFFSET i386bsd_sc_sp_offset
#endif

  /* Override the default value for the offset of the program counter
     in the sigcontext structure.  */
  sc_pc_offset = offsetof (struct sigcontext, sc_pc);

  if (SC_PC_OFFSET != sc_pc_offset)
    {
      warning ("\
offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>.",
	       sc_pc_offset, SC_PC_OFFSET);
    }

  SC_PC_OFFSET = sc_pc_offset;

  /* Likewise for the stack pointer.  */
  sc_sp_offset = offsetof (struct sigcontext, sc_sp);

  if (SC_SP_OFFSET != sc_sp_offset)
    {
      warning ("\
offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>.",
	       sc_sp_offset, SC_SP_OFFSET);
    }

  SC_SP_OFFSET = sc_sp_offset;
}
Commit	Line	Data
e6031aeb	1	/* Native-dependent code for modern i386 BSD's.
7e89e357	2	Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
e6031aeb MK	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
	20
	21	#include "defs.h"
	22	#include "inferior.h"
4e052eda	23	#include "regcache.h"
e6031aeb	24
0afdd437	25	#include "gdb_assert.h"
b7247919 MK	26	#include <signal.h>
b7247919 MK	27	#include <stddef.h>
e6031aeb MK	28	#include <sys/types.h>
	29	#include <sys/ptrace.h>
	30	#include <machine/reg.h>
	31	#include <machine/frame.h>
	32
	33	#ifdef HAVE_SYS_PROCFS_H
	34	#include <sys/procfs.h>
	35	#endif
	36
	37	#ifndef HAVE_GREGSET_T
	38	typedef struct reg gregset_t;
	39	#endif
	40
	41	#ifndef HAVE_FPREGSET_T
	42	typedef struct fpreg fpregset_t;
	43	#endif
	44
b051bfa4	45	#include "gregset.h"
57976e88	46	#include "i386-tdep.h"
b051bfa4 MK	47	\f
b051bfa4 MK	48
e6031aeb MK	49	/* In older BSD versions we cannot get at some of the segment
	50	registers. FreeBSD for example didn't support the %fs and %gs
	51	registers until the 3.0 release. We have autoconf checks for their
	52	presence, and deal gracefully with their absence. */
	53
	54	/* Registers we shouldn't try to fetch. */
	55	#if !defined (CANNOT_FETCH_REGISTER)
	56	#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
	57	#endif
	58
	59	/* Registers we shouldn't try to store. */
	60	#if !defined (CANNOT_STORE_REGISTER)
b051bfa4	61	#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
e6031aeb MK	62	#endif
	63
	64	/* Offset to the gregset_t location where REG is stored. */
	65	#define REG_OFFSET(reg) offsetof (gregset_t, reg)
	66
	67	/* At reg_offset[REGNO] you'll find the offset to the gregset_t
	68	location where the GDB register REGNO is stored. Unsupported
	69	registers are marked with `-1'. */
	70	static int reg_offset[] =
	71	{
	72	REG_OFFSET (r_eax),
	73	REG_OFFSET (r_ecx),
	74	REG_OFFSET (r_edx),
2c48bda3	75	REG_OFFSET (r_ebx),
e6031aeb MK	76	REG_OFFSET (r_esp),
	77	REG_OFFSET (r_ebp),
	78	REG_OFFSET (r_esi),
	79	REG_OFFSET (r_edi),
	80	REG_OFFSET (r_eip),
	81	REG_OFFSET (r_eflags),
	82	REG_OFFSET (r_cs),
	83	REG_OFFSET (r_ss),
	84	REG_OFFSET (r_ds),
	85	REG_OFFSET (r_es),
422ea4b8	86	#ifdef HAVE_STRUCT_REG_R_FS
e6031aeb MK	87	REG_OFFSET (r_fs),
	88	#else
	89	-1,
	90	#endif
422ea4b8	91	#ifdef HAVE_STRUCT_REG_R_GS
e6031aeb MK	92	REG_OFFSET (r_gs)
	93	#else
	94	-1
	95	#endif
	96	};
	97
	98	#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
	99
7e89e357 JT	100	/* Macro to determine if a register is fetched with PT_GETREGS. */
	101	#define GETREGS_SUPPLIES(regno) \
	102	((0 <= (regno) && (regno) <= 15))
	103
	104	#ifdef HAVE_PT_GETXMMREGS
	105	/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
	106	so that we try PT_GETXMMREGS the first time around. */
	107	static int have_ptrace_xmmregs = -1;
	108	#endif
	109
e6031aeb MK	110	/* Return nonzero if we shouldn't try to fetch register REGNO. */
	111
	112	static int
	113	cannot_fetch_register (int regno)
	114	{
	115	return (reg_offset[regno] == -1);
	116	}
	117	\f
	118
	119	/* Transfering the registers between GDB, inferiors and core files. */
	120
ad2a4d09	121	/* Fill GDB's register array with the general-purpose register values
e6031aeb MK	122	in GREGSETP. /
	123
	124	void
	125	supply_gregset (gregset_t *gregsetp)
	126	{
e6031aeb MK	127	int i;
e6031aeb MK	128
57976e88	129	for (i = 0; i < I386_NUM_GREGS; i++)
e6031aeb MK	130	{
e6031aeb MK	131	if (CANNOT_FETCH_REGISTER (i))
b051bfa4	132	supply_register (i, NULL);
e6031aeb MK	133	else
	134	supply_register (i, REG_ADDR (gregsetp, i));
	135	}
	136	}
	137
	138	/* Fill register REGNO (if it is a general-purpose register) in
	139	*GREGSETPS with the value in GDB's register array. If REGNO is -1,
	140	do this for all registers. */
	141
	142	void
	143	fill_gregset (gregset_t *gregsetp, int regno)
	144	{
	145	int i;
	146
57976e88	147	for (i = 0; i < I386_NUM_GREGS; i++)
e6031aeb	148	if ((regno == -1 \|\| regno == i) && ! CANNOT_STORE_REGISTER (i))
7e89e357	149	regcache_collect (i, REG_ADDR (gregsetp, i));
e6031aeb MK	150	}
e6031aeb MK	151
e750d25e	152	#include "i387-tdep.h"
e6031aeb MK	153
	154	/* Fill GDB's register array with the floating-point register values
	155	in FPREGSETP. /
	156
	157	void
	158	supply_fpregset (fpregset_t *fpregsetp)
	159	{
	160	i387_supply_fsave ((char *) fpregsetp);
	161	}
	162
	163	/* Fill register REGNO (if it is a floating-point register) in
	164	*FPREGSETP with the value in GDB's register array. If REGNO is -1,
	165	do this for all registers. */
	166
	167	void
	168	fill_fpregset (fpregset_t *fpregsetp, int regno)
	169	{
	170	i387_fill_fsave ((char *) fpregsetp, regno);
	171	}
	172
	173	/* Fetch register REGNO from the inferior. If REGNO is -1, do this
	174	for all registers (including the floating point registers). */
	175
	176	void
	177	fetch_inferior_registers (int regno)
	178	{
e6031aeb	179
7e89e357 JT	180	if (regno == -1 \|\| GETREGS_SUPPLIES (regno))
	181	{
	182	gregset_t gregs;
	183
	184	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	185	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	186	perror_with_name ("Couldn't get registers");
e6031aeb	187
7e89e357 JT	188	supply_gregset (&gregs);
	189	if (regno != -1)
	190	return;
	191	}
e6031aeb MK	192
	193	if (regno == -1 \|\| regno >= FP0_REGNUM)
	194	{
	195	fpregset_t fpregs;
7e89e357 JT	196	#ifdef HAVE_PT_GETXMMREGS
	197	char xmmregs[512];
	198
	199	if (have_ptrace_xmmregs != 0 &&
	200	ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	201	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	202	{
	203	have_ptrace_xmmregs = 1;
	204	i387_supply_fxsave (xmmregs);
	205	}
	206	else
	207	{
	208	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	209	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	210	perror_with_name ("Couldn't get floating point status");
e6031aeb	211
7e89e357 JT	212	supply_fpregset (&fpregs);
	213	}
	214	#else
39f77062	215	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
e6031aeb MK	216	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	217	perror_with_name ("Couldn't get floating point status");
	218
	219	supply_fpregset (&fpregs);
7e89e357	220	#endif
e6031aeb	221	}
b051bfa4	222	}
e6031aeb MK	223
	224	/* Store register REGNO back into the inferior. If REGNO is -1, do
	225	this for all registers (including the floating point registers). */
	226
	227	void
	228	store_inferior_registers (int regno)
	229	{
e6031aeb	230
7e89e357 JT	231	if (regno == -1 \|\| GETREGS_SUPPLIES (regno))
	232	{
	233	gregset_t gregs;
	234
	235	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	236	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	237	perror_with_name ("Couldn't get registers");
e6031aeb	238
7e89e357	239	fill_gregset (&gregs, regno);
e6031aeb	240
7e89e357 JT	241	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	242	(PTRACE_ARG3_TYPE) &gregs, 0) == -1)
	243	perror_with_name ("Couldn't write registers");
	244
	245	if (regno != -1)
	246	return;
	247	}
e6031aeb MK	248
	249	if (regno == -1 \|\| regno >= FP0_REGNUM)
	250	{
	251	fpregset_t fpregs;
7e89e357 JT	252	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	253	char xmmregs[512];
e6031aeb	254
7e89e357 JT	255	if (have_ptrace_xmmregs != 0 &&
	256	ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
	257	(PTRACE_ARG3_TYPE) xmmregs, 0) == 0)
	258	{
	259	have_ptrace_xmmregs = 1;
	260
	261	i387_fill_fxsave (xmmregs, regno);
e6031aeb	262
7e89e357 JT	263	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
	264	(PTRACE_ARG3_TYPE) xmmregs, 0) == -1)
	265	perror_with_name ("Couldn't write XMM registers");
	266	}
	267	else
	268	{
	269	have_ptrace_xmmregs = 0;
	270	#endif
	271	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	272	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	273	perror_with_name ("Couldn't get floating point status");
	274
	275	fill_fpregset (&fpregs, regno);
e6031aeb	276
7e89e357 JT	277	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	278	(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
	279	perror_with_name ("Couldn't write floating point status");
	280	#ifdef HAVE_PT_GETXMMREGS
	281	}
	282	#endif
e6031aeb MK	283	}
	284	}
	285	\f
	286
0afdd437 MK	287	/* Support for debug registers. */
	288
	289	#ifdef HAVE_PT_GETDBREGS
	290
	291	/* Not all versions of FreeBSD/i386 that support the debug registers
	292	have this macro. */
	293	#ifndef DBREG_DRX
	294	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	295	#endif
	296
	297	static void
	298	i386bsd_dr_set (int regnum, unsigned int value)
	299	{
	300	struct dbreg dbregs;
	301
39f77062 KB	302	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	303	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	304	perror_with_name ("Couldn't get debug registers");
	305
	306	/* For some mysterious reason, some of the reserved bits in the
	307	debug control register get set. Mask these off, otherwise the
	308	ptrace call below will fail. */
	309	dbregs.dr7 &= ~(0x0000fc00);
	310
	311	DBREG_DRX ((&dbregs), regnum) = value;
	312
39f77062 KB	313	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	314	(PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
0afdd437 MK	315	perror_with_name ("Couldn't write debug registers");
	316	}
	317
	318	void
	319	i386bsd_dr_set_control (unsigned long control)
	320	{
	321	i386bsd_dr_set (7, control);
	322	}
	323
	324	void
	325	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	326	{
	327	gdb_assert (regnum >= 0 && regnum <= 4);
	328
	329	i386bsd_dr_set (regnum, addr);
	330	}
	331
	332	void
	333	i386bsd_dr_reset_addr (int regnum)
	334	{
	335	gdb_assert (regnum >= 0 && regnum <= 4);
	336
	337	i386bsd_dr_set (regnum, 0);
	338	}
	339
	340	unsigned long
	341	i386bsd_dr_get_status (void)
	342	{
	343	struct dbreg dbregs;
	344
	345	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	346	ptrace call fails breaks debugging remote targets. The correct
	347	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	348	stuff to the target vector. For now, just return zero if the
0afdd437	349	ptrace call fails. */
39f77062 KB	350	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
39f77062 KB	351	(PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
0afdd437 MK	352	#if 0
	353	perror_with_name ("Couldn't read debug registers");
	354	#else
	355	return 0;
	356	#endif
	357
	358	return dbregs.dr6;
	359	}
	360
	361	#endif /* PT_GETDBREGS */
	362	\f
	363
e6031aeb MK	364	/* Support for the user struct. */
	365
	366	/* Return the address register REGNO. BLOCKEND is the value of
	367	u.u_ar0, which should point to the registers. */
	368
	369	CORE_ADDR
	370	register_u_addr (CORE_ADDR blockend, int regno)
	371	{
	372	return (CORE_ADDR) REG_ADDR (blockend, regno);
	373	}
	374
	375	#include <sys/param.h>
	376	#include <sys/user.h>
	377
	378	/* Return the size of the user struct. */
	379
	380	int
	381	kernel_u_size (void)
	382	{
	383	return (sizeof (struct user));
	384	}
b7247919	385	\f
b7247919 MK	386	void
	387	_initialize_i386bsd_nat (void)
	388	{
8201327c	389	int sc_pc_offset;
6bff26de	390	int sc_sp_offset;
8201327c	391
b7247919 MK	392	/* To support the recognition of signal handlers, i386bsd-tdep.c
	393	hardcodes some constants. Inclusion of this file means that we
	394	are compiling a native debugger, which means that we can use the
	395	system header files and sysctl(3) to get at the relevant
	396	information. */
	397
8201327c MK	398	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
8201327c MK	399	extern int i386fbsd4_sc_pc_offset;
6bff26de	400	extern int i386fbsd4_sc_sp_offset;
8201327c	401	#define SC_PC_OFFSET i386fbsd4_sc_pc_offset
6bff26de	402	#define SC_SP_OFFSET i386fbsd4_sc_sp_offset
6916549a	403	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__) \|\| defined (OpenBSD)
8201327c	404	extern int i386nbsd_sc_pc_offset;
6bff26de	405	extern int i386nbsd_sc_sp_offset;
8201327c	406	#define SC_PC_OFFSET i386nbsd_sc_pc_offset
6bff26de	407	#define SC_SP_OFFSET i386nbsd_sc_sp_offset
8201327c MK	408	#else
8201327c MK	409	extern int i386bsd_sc_pc_offset;
6bff26de	410	extern int i386bsd_sc_sp_offset;
8201327c	411	#define SC_PC_OFFSET i386bsd_sc_pc_offset
6bff26de	412	#define SC_SP_OFFSET i386bsd_sc_sp_offset
8201327c MK	413	#endif
8201327c MK	414
b7247919 MK	415	/* Override the default value for the offset of the program counter
b7247919 MK	416	in the sigcontext structure. */
8201327c MK	417	sc_pc_offset = offsetof (struct sigcontext, sc_pc);
	418
	419	if (SC_PC_OFFSET != sc_pc_offset)
	420	{
	421	warning ("\
	422	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
	423	Please report this to <bug-gdb@gnu.org>.",
	424	sc_pc_offset, SC_PC_OFFSET);
	425	}
	426
	427	SC_PC_OFFSET = sc_pc_offset;
6bff26de MK	428
	429	/* Likewise for the stack pointer. */
	430	sc_sp_offset = offsetof (struct sigcontext, sc_sp);
	431
	432	if (SC_SP_OFFSET != sc_sp_offset)
	433	{
	434	warning ("\
	435	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
	436	Please report this to <bug-gdb@gnu.org>.",
	437	sc_sp_offset, SC_SP_OFFSET);
	438	}
	439
	440	SC_SP_OFFSET = sc_sp_offset;
b7247919	441	}