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

/* Native-dependent code for modern i386 BSD's.

   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
   2011 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 "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>

#include "i386-tdep.h"
#include "i387-tdep.h"
#include "i386bsd-nat.h"
#include "inf-ptrace.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.  */

/* Offset in `struct reg' where MEMBER is stored.  */
#define REG_OFFSET(member) offsetof (struct reg, member)

/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
   reg' where the GDB register REGNUM is stored.  Unsupported
   registers are marked with `-1'.  */
static int i386bsd_r_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
};

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

/* Supply the general-purpose registers in GREGS, to REGCACHE.  */

static void
i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
  const char *regs = gregs;
  int regnum;

  for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
    {
      int offset = i386bsd_r_reg_offset[regnum];

      if (offset != -1)
	regcache_raw_supply (regcache, regnum, regs + offset);
    }
}

/* Collect register REGNUM from REGCACHE and store its contents in
   GREGS.  If REGNUM is -1, collect and store all appropriate
   registers.  */

static void
i386bsd_collect_gregset (const struct regcache *regcache,
			 void *gregs, int regnum)
{
  char *regs = gregs;
  int i;

  for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
    {
      if (regnum == -1 || regnum == i)
	{
	  int offset = i386bsd_r_reg_offset[i];

	  if (offset != -1)
	    regcache_raw_collect (regcache, i, regs + offset);
	}
    }
}

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

static void
i386bsd_fetch_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;

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

      i386bsd_supply_gregset (regcache, &regs);
      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      struct fpreg fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;
	  i387_supply_fxsave (regcache, -1, xmmregs);
	}
      else
	{
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't get floating point status"));

	  i387_supply_fsave (regcache, -1, &fpregs);
	}
#else
      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      i387_supply_fsave (regcache, -1, &fpregs);
#endif
    }
}

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

static void
i386bsd_store_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;

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

      i386bsd_collect_gregset (regcache, &regs, regnum);

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

      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      struct fpreg fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];

      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
		    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;

	  i387_collect_fxsave (regcache, regnum, xmmregs);

	  if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
		      (PTRACE_TYPE_ARG3) 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_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't get floating point status"));

          i387_collect_fsave (regcache, regnum, &fpregs);

          if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't write floating point status"));
#ifdef HAVE_PT_GETXMMREGS
        }
#endif
    }
}

/* Create a prototype *BSD/i386 target.  The client can override it
   with local methods.  */

struct target_ops *
i386bsd_target (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = i386bsd_fetch_inferior_registers;
  t->to_store_registers = i386bsd_store_inferior_registers;
  return t;
}
\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_TYPE_ARG3) &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.  */
  DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);

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

  if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_TYPE_ARG3) &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_TYPE_ARG3) &dbregs, 0) == -1)
#if 0
    perror_with_name (_("Couldn't read debug registers"));
#else
    return 0;
#endif

  return DBREG_DRX ((&dbregs), 6);
}

#endif /* PT_GETDBREGS */
\f

void
_initialize_i386bsd_nat (void)
{
  int 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
#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
#define SC_REG_OFFSET i386fbsd_sc_reg_offset
#elif defined (NetBSD) || defined (__NetBSD_Version__)
#define SC_REG_OFFSET i386nbsd_sc_reg_offset
#elif defined (OpenBSD)
#define SC_REG_OFFSET i386obsd_sc_reg_offset
#endif

#ifdef SC_REG_OFFSET

  /* We only check the program counter, stack pointer and frame
     pointer since these members of `struct sigcontext' are essential
     for providing backtraces.  More checks could be added, but would
     involve adding configure checks for the appropriate structure
     members, since older BSD's don't provide all of them.  */

#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]

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

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

  SC_PC_OFFSET = offset;

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

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

  SC_SP_OFFSET = offset;

  /* And the frame pointer.  */
  offset = offsetof (struct sigcontext, sc_fp);

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

  SC_FP_OFFSET = offset;

#endif /* SC_REG_OFFSET */
}
Commit	Line	Data
e6031aeb	1	/* Native-dependent code for modern i386 BSD's.
3f63813d	2
7b6bb8da JB	3	Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
7b6bb8da JB	4	2011 Free Software Foundation, Inc.
e6031aeb MK	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
a9762ec7	10	the Free Software Foundation; either version 3 of the License, or
e6031aeb MK	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
a9762ec7	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
e6031aeb MK	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
57976e88	33	#include "i386-tdep.h"
1fc7d519	34	#include "i387-tdep.h"
9692934b MK	35	#include "i386bsd-nat.h"
9692934b MK	36	#include "inf-ptrace.h"
b051bfa4 MK	37	\f
b051bfa4 MK	38
e6031aeb MK	39	/* In older BSD versions we cannot get at some of the segment
	40	registers. FreeBSD for example didn't support the %fs and %gs
	41	registers until the 3.0 release. We have autoconf checks for their
	42	presence, and deal gracefully with their absence. */
	43
6cfb2041 MK	44	/* Offset in `struct reg' where MEMBER is stored. */
6cfb2041 MK	45	#define REG_OFFSET(member) offsetof (struct reg, member)
e6031aeb	46
6cfb2041 MK	47	/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
6cfb2041 MK	48	reg' where the GDB register REGNUM is stored. Unsupported
e6031aeb	49	registers are marked with `-1'. */
6cfb2041	50	static int i386bsd_r_reg_offset[] =
e6031aeb MK	51	{
	52	REG_OFFSET (r_eax),
	53	REG_OFFSET (r_ecx),
	54	REG_OFFSET (r_edx),
2c48bda3	55	REG_OFFSET (r_ebx),
e6031aeb MK	56	REG_OFFSET (r_esp),
	57	REG_OFFSET (r_ebp),
	58	REG_OFFSET (r_esi),
	59	REG_OFFSET (r_edi),
	60	REG_OFFSET (r_eip),
	61	REG_OFFSET (r_eflags),
	62	REG_OFFSET (r_cs),
	63	REG_OFFSET (r_ss),
	64	REG_OFFSET (r_ds),
	65	REG_OFFSET (r_es),
422ea4b8	66	#ifdef HAVE_STRUCT_REG_R_FS
e6031aeb MK	67	REG_OFFSET (r_fs),
	68	#else
	69	-1,
	70	#endif
422ea4b8	71	#ifdef HAVE_STRUCT_REG_R_GS
e6031aeb MK	72	REG_OFFSET (r_gs)
	73	#else
	74	-1
	75	#endif
	76	};
	77
7e89e357	78	/* Macro to determine if a register is fetched with PT_GETREGS. */
283accbc MK	79	#define GETREGS_SUPPLIES(regnum) \
283accbc MK	80	((0 <= (regnum) && (regnum) <= 15))
7e89e357 JT	81
	82	#ifdef HAVE_PT_GETXMMREGS
	83	/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
	84	so that we try PT_GETXMMREGS the first time around. */
	85	static int have_ptrace_xmmregs = -1;
	86	#endif
e6031aeb MK	87	\f
e6031aeb MK	88
6cfb2041	89	/* Supply the general-purpose registers in GREGS, to REGCACHE. */
e6031aeb	90
1fc7d519	91	static void
6cfb2041	92	i386bsd_supply_gregset (struct regcache regcache, const void gregs)
e6031aeb	93	{
6cfb2041	94	const char *regs = gregs;
feae6502	95	int regnum;
e6031aeb	96
6cfb2041	97	for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
e6031aeb	98	{
6cfb2041 MK	99	int offset = i386bsd_r_reg_offset[regnum];
	100
	101	if (offset != -1)
	102	regcache_raw_supply (regcache, regnum, regs + offset);
e6031aeb MK	103	}
	104	}
	105
6cfb2041 MK	106	/* Collect register REGNUM from REGCACHE and store its contents in
	107	GREGS. If REGNUM is -1, collect and store all appropriate
	108	registers. */
e6031aeb	109
1fc7d519	110	static void
6cfb2041 MK	111	i386bsd_collect_gregset (const struct regcache *regcache,
6cfb2041 MK	112	void *gregs, int regnum)
e6031aeb	113	{
6cfb2041	114	char *regs = gregs;
e6031aeb MK	115	int i;
e6031aeb MK	116
6cfb2041 MK	117	for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
	118	{
	119	if (regnum == -1 \|\| regnum == i)
	120	{
	121	int offset = i386bsd_r_reg_offset[i];
e6031aeb	122
6cfb2041 MK	123	if (offset != -1)
	124	regcache_raw_collect (regcache, i, regs + offset);
	125	}
	126	}
	127	}
e6031aeb	128
283accbc	129	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
e6031aeb MK	130	for all registers (including the floating point registers). */
e6031aeb MK	131
9692934b	132	static void
28439f5e PA	133	i386bsd_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	134	struct regcache *regcache, int regnum)
e6031aeb	135	{
283accbc	136	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357	137	{
6cfb2041	138	struct reg regs;
7e89e357 JT	139
7e89e357 JT	140	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
9f8e0089	141	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	142	perror_with_name (_("Couldn't get registers"));
e6031aeb	143
56be3814	144	i386bsd_supply_gregset (regcache, &regs);
283accbc	145	if (regnum != -1)
7e89e357 JT	146	return;
7e89e357 JT	147	}
e6031aeb	148
283accbc	149	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb	150	{
6cfb2041	151	struct fpreg fpregs;
7e89e357 JT	152	#ifdef HAVE_PT_GETXMMREGS
	153	char xmmregs[512];
	154
a144416f MK	155	if (have_ptrace_xmmregs != 0
a144416f MK	156	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
9f8e0089	157	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
7e89e357 JT	158	{
7e89e357 JT	159	have_ptrace_xmmregs = 1;
56be3814	160	i387_supply_fxsave (regcache, -1, xmmregs);
7e89e357 JT	161	}
	162	else
	163	{
	164	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
9f8e0089	165	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	166	perror_with_name (_("Couldn't get floating point status"));
e6031aeb	167
56be3814	168	i387_supply_fsave (regcache, -1, &fpregs);
7e89e357 JT	169	}
7e89e357 JT	170	#else
39f77062	171	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
9f8e0089	172	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	173	perror_with_name (_("Couldn't get floating point status"));
e6031aeb	174
56be3814	175	i387_supply_fsave (regcache, -1, &fpregs);
7e89e357	176	#endif
e6031aeb	177	}
b051bfa4	178	}
e6031aeb	179
283accbc	180	/* Store register REGNUM back into the inferior. If REGNUM is -1, do
e6031aeb MK	181	this for all registers (including the floating point registers). */
e6031aeb MK	182
9692934b	183	static void
28439f5e PA	184	i386bsd_store_inferior_registers (struct target_ops *ops,
28439f5e PA	185	struct regcache *regcache, int regnum)
e6031aeb	186	{
283accbc	187	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357	188	{
6cfb2041	189	struct reg regs;
7e89e357 JT	190
7e89e357 JT	191	if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
9f8e0089	192	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	193	perror_with_name (_("Couldn't get registers"));
e6031aeb	194
56be3814	195	i386bsd_collect_gregset (regcache, &regs, regnum);
e6031aeb	196
7e89e357	197	if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
9f8e0089	198	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	199	perror_with_name (_("Couldn't write registers"));
7e89e357	200
283accbc	201	if (regnum != -1)
7e89e357 JT	202	return;
7e89e357 JT	203	}
e6031aeb	204
283accbc	205	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb	206	{
6cfb2041	207	struct fpreg fpregs;
7e89e357 JT	208	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	209	char xmmregs[512];
e6031aeb	210
a144416f MK	211	if (have_ptrace_xmmregs != 0
a144416f MK	212	&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
9f8e0089	213	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
7e89e357 JT	214	{
	215	have_ptrace_xmmregs = 1;
	216
56be3814	217	i387_collect_fxsave (regcache, regnum, xmmregs);
e6031aeb	218
7e89e357	219	if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),
9f8e0089	220	(PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
e2e0b3e5	221	perror_with_name (_("Couldn't write XMM registers"));
7e89e357 JT	222	}
	223	else
	224	{
	225	have_ptrace_xmmregs = 0;
	226	#endif
	227	if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
9f8e0089	228	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	229	perror_with_name (_("Couldn't get floating point status"));
7e89e357	230
56be3814	231	i387_collect_fsave (regcache, regnum, &fpregs);
f5b1afdf	232
7e89e357	233	if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
9f8e0089	234	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	235	perror_with_name (_("Couldn't write floating point status"));
7e89e357 JT	236	#ifdef HAVE_PT_GETXMMREGS
	237	}
	238	#endif
e6031aeb MK	239	}
e6031aeb MK	240	}
9692934b MK	241
	242	/* Create a prototype *BSD/i386 target. The client can override it
	243	with local methods. */
	244
	245	struct target_ops *
	246	i386bsd_target (void)
	247	{
	248	struct target_ops *t;
	249
	250	t = inf_ptrace_target ();
	251	t->to_fetch_registers = i386bsd_fetch_inferior_registers;
	252	t->to_store_registers = i386bsd_store_inferior_registers;
	253	return t;
	254	}
e6031aeb MK	255	\f
e6031aeb MK	256
0afdd437 MK	257	/* Support for debug registers. */
	258
	259	#ifdef HAVE_PT_GETDBREGS
	260
	261	/* Not all versions of FreeBSD/i386 that support the debug registers
	262	have this macro. */
	263	#ifndef DBREG_DRX
	264	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	265	#endif
	266
	267	static void
	268	i386bsd_dr_set (int regnum, unsigned int value)
	269	{
	270	struct dbreg dbregs;
	271
39f77062	272	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
9f8e0089	273	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
e2e0b3e5	274	perror_with_name (_("Couldn't get debug registers"));
0afdd437 MK	275
	276	/* For some mysterious reason, some of the reserved bits in the
	277	debug control register get set. Mask these off, otherwise the
	278	ptrace call below will fail. */
afdb036a	279	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	280
	281	DBREG_DRX ((&dbregs), regnum) = value;
	282
39f77062	283	if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
9f8e0089	284	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
e2e0b3e5	285	perror_with_name (_("Couldn't write debug registers"));
0afdd437 MK	286	}
	287
	288	void
	289	i386bsd_dr_set_control (unsigned long control)
	290	{
	291	i386bsd_dr_set (7, control);
	292	}
	293
	294	void
	295	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	296	{
	297	gdb_assert (regnum >= 0 && regnum <= 4);
	298
	299	i386bsd_dr_set (regnum, addr);
	300	}
	301
	302	void
	303	i386bsd_dr_reset_addr (int regnum)
	304	{
	305	gdb_assert (regnum >= 0 && regnum <= 4);
	306
	307	i386bsd_dr_set (regnum, 0);
	308	}
	309
	310	unsigned long
	311	i386bsd_dr_get_status (void)
	312	{
	313	struct dbreg dbregs;
	314
	315	/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
	316	ptrace call fails breaks debugging remote targets. The correct
	317	way to fix this is to add the hardware breakpoint and watchpoint
b7247919	318	stuff to the target vector. For now, just return zero if the
0afdd437	319	ptrace call fails. */
39f77062	320	if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
9f8e0089	321	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
0afdd437	322	#if 0
e2e0b3e5	323	perror_with_name (_("Couldn't read debug registers"));
0afdd437 MK	324	#else
	325	return 0;
	326	#endif
	327
afdb036a	328	return DBREG_DRX ((&dbregs), 6);
0afdd437 MK	329	}
	330
	331	#endif /* PT_GETDBREGS */
	332	\f
	333
b7247919 MK	334	void
	335	_initialize_i386bsd_nat (void)
	336	{
a3386186	337	int offset;
8201327c	338
b7247919 MK	339	/* To support the recognition of signal handlers, i386bsd-tdep.c
	340	hardcodes some constants. Inclusion of this file means that we
	341	are compiling a native debugger, which means that we can use the
	342	system header files and sysctl(3) to get at the relevant
	343	information. */
	344
8201327c	345	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	346	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	347	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	348	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	349	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	350	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	351	#elif defined (OpenBSD)
a3386186	352	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c MK	353	#endif
8201327c MK	354
bbe06c74 MK	355	#ifdef SC_REG_OFFSET
bbe06c74 MK	356
a3386186 MK	357	/* We only check the program counter, stack pointer and frame
	358	pointer since these members of `struct sigcontext' are essential
	359	for providing backtraces. More checks could be added, but would
	360	involve adding configure checks for the appropriate structure
	361	members, since older BSD's don't provide all of them. */
	362
	363	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	364	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	365	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	366
b7247919 MK	367	/* Override the default value for the offset of the program counter
b7247919 MK	368	in the sigcontext structure. */
a3386186	369	offset = offsetof (struct sigcontext, sc_pc);
8201327c	370
a3386186	371	if (SC_PC_OFFSET != offset)
8201327c	372	{
8a3fe4f8	373	warning (_("\
8201327c	374	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
8a3fe4f8	375	Please report this to <bug-gdb@gnu.org>."),
a3386186	376	offset, SC_PC_OFFSET);
8201327c MK	377	}
8201327c MK	378
a3386186	379	SC_PC_OFFSET = offset;
6bff26de MK	380
6bff26de MK	381	/* Likewise for the stack pointer. */
a3386186	382	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	383
a3386186	384	if (SC_SP_OFFSET != offset)
6bff26de	385	{
8a3fe4f8	386	warning (_("\
6bff26de	387	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
8a3fe4f8	388	Please report this to <bug-gdb@gnu.org>."),
a3386186 MK	389	offset, SC_SP_OFFSET);
	390	}
	391
	392	SC_SP_OFFSET = offset;
	393
	394	/* And the frame pointer. */
	395	offset = offsetof (struct sigcontext, sc_fp);
	396
	397	if (SC_FP_OFFSET != offset)
	398	{
8a3fe4f8	399	warning (_("\
a3386186	400	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
8a3fe4f8	401	Please report this to <bug-gdb@gnu.org>."),
a3386186	402	offset, SC_FP_OFFSET);
6bff26de MK	403	}
6bff26de MK	404
a3386186	405	SC_FP_OFFSET = offset;
bbe06c74 MK	406
bbe06c74 MK	407	#endif /* SC_REG_OFFSET */
b7247919	408	}