gdb/i386-bsd-nat.c - binutils-gdb - Git at Google

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

    Copyright (C) 2000-2021 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 <signal.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 "x86-bsd-nat.h"
 #include "i386-bsd-nat.h"
 #include "inf-ptrace.h"


 static PTRACE_TYPE_RET
 gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
 	    PTRACE_TYPE_ARG4 data)
 {
 #ifdef __NetBSD__
   gdb_assert (data == 0);
   /* Support for NetBSD threads: unlike other ptrace implementations in this
      file, NetBSD requires that we pass both the pid and lwp.  */
   return ptrace (request, ptid.pid (), addr, ptid.lwp ());
 #else
   pid_t pid = get_ptrace_pid (ptid);
   return ptrace (request, pid, addr, data);
 #endif
 }

 /* 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


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

 static void
 i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
 {
   const char *regs = (const char *) 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 (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 = (char *) 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 (i, regs + offset);
 	}
     }
 }

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

 void
 i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
 {
   ptid_t ptid = regcache->ptid ();

   if (regnum == -1 || GETREGS_SUPPLIES (regnum))
     {
       struct reg regs;

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

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

 #ifdef PT_GETFSBASE
   if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
     {
       register_t base;

       if (gdb_ptrace (PT_GETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 	perror_with_name (_("Couldn't get segment register fs_base"));

       regcache->raw_supply (I386_FSBASE_REGNUM, &base);
       if (regnum != -1)
 	return;
     }
 #endif
 #ifdef PT_GETGSBASE
   if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
     {
       register_t base;

       if (gdb_ptrace (PT_GETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 	perror_with_name (_("Couldn't get segment register gs_base"));

       regcache->raw_supply (I386_GSBASE_REGNUM, &base);
       if (regnum != -1)
 	return;
     }
 #endif

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

 #ifdef PT_GETXSTATE_INFO
       if (x86bsd_xsave_len != 0)
 	{
 	  void *xstateregs;

 	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (gdb_ptrace (PT_GETXSTATE, ptid,
 			  (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));

 	  i387_supply_xsave (regcache, -1, xstateregs);
 	  return;
 	}
 #endif

 #ifdef HAVE_PT_GETXMMREGS
       if (have_ptrace_xmmregs != 0
 	  && gdb_ptrace(PT_GETXMMREGS, ptid,
 			(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
 	{
 	  have_ptrace_xmmregs = 1;
 	  i387_supply_fxsave (regcache, -1, xmmregs);
 	}
       else
 	{
 	  have_ptrace_xmmregs = 0;
 #endif
 	  if (gdb_ptrace (PT_GETFPREGS, ptid,
 			  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 	    perror_with_name (_("Couldn't get floating point status"));

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

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

 void
 i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)
 {
   ptid_t ptid = regcache->ptid ();

   if (regnum == -1 || GETREGS_SUPPLIES (regnum))
     {
       struct reg regs;

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

       i386bsd_collect_gregset (regcache, &regs, regnum);

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

       if (regnum != -1)
 	return;
     }

 #ifdef PT_SETFSBASE
   if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
     {
       register_t base;

       regcache->raw_collect (I386_FSBASE_REGNUM, &base);

       if (gdb_ptrace (PT_SETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 	perror_with_name (_("Couldn't write segment register fs_base"));
       if (regnum != -1)
 	return;
     }
 #endif
 #ifdef PT_SETGSBASE
   if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
     {
       register_t base;

       regcache->raw_collect (I386_GSBASE_REGNUM, &base);

       if (gdb_ptrace (PT_SETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
 	perror_with_name (_("Couldn't write segment register gs_base"));
       if (regnum != -1)
 	return;
     }
 #endif

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

 #ifdef PT_GETXSTATE_INFO
       if (x86bsd_xsave_len != 0)
 	{
 	  void *xstateregs;

 	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (gdb_ptrace (PT_GETXSTATE, ptid,
 			  (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));

 	  i387_collect_xsave (regcache, -1, xstateregs, 0);

 	  if (gdb_ptrace (PT_SETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs,
 			  x86bsd_xsave_len) == -1)
 	    perror_with_name (_("Couldn't write extended state status"));
 	  return;
 	}
 #endif

 #ifdef HAVE_PT_GETXMMREGS
       if (have_ptrace_xmmregs != 0
 	  && gdb_ptrace(PT_GETXMMREGS, ptid,
 			(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
 	{
 	  have_ptrace_xmmregs = 1;

 	  i387_collect_fxsave (regcache, regnum, xmmregs);

 	  if (gdb_ptrace (PT_SETXMMREGS, ptid,
 			  (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
 	    perror_with_name (_("Couldn't write XMM registers"));
 	}
       else
 	{
 	  have_ptrace_xmmregs = 0;
 #endif
 	  if (gdb_ptrace (PT_GETFPREGS, ptid,
 			  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 	    perror_with_name (_("Couldn't get floating point status"));

 	  i387_collect_fsave (regcache, regnum, &fpregs);

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

 void _initialize_i386bsd_nat ();
 void
 _initialize_i386bsd_nat ()
 {
   /* To support the recognition of signal handlers, i386-bsd-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 (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.  */
   int 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 */
 }
	/* Native-dependent code for modern i386 BSD's.

	Copyright (C) 2000-2021 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 <signal.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 "x86-bsd-nat.h"
	#include "i386-bsd-nat.h"
	#include "inf-ptrace.h"


	static PTRACE_TYPE_RET
	gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
	PTRACE_TYPE_ARG4 data)
	{
	#ifdef __NetBSD__
	gdb_assert (data == 0);
	/* Support for NetBSD threads: unlike other ptrace implementations in this
	file, NetBSD requires that we pass both the pid and lwp. */
	return ptrace (request, ptid.pid (), addr, ptid.lwp ());
	#else
	pid_t pid = get_ptrace_pid (ptid);
	return ptrace (request, pid, addr, data);
	#endif
	}

	/* 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


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

	static void
	i386bsd_supply_gregset (struct regcache regcache, const void gregs)
	{
	const char regs = (const char ) 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 (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 = (char ) 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 (i, regs + offset);
	}
	}
	}

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

	void
	i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
	{
	ptid_t ptid = regcache->ptid ();

	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
	{
	struct reg regs;

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

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

	#ifdef PT_GETFSBASE
	if (regnum == -1 \|\| regnum == I386_FSBASE_REGNUM)
	{
	register_t base;

	if (gdb_ptrace (PT_GETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
	perror_with_name (_("Couldn't get segment register fs_base"));

	regcache->raw_supply (I386_FSBASE_REGNUM, &base);
	if (regnum != -1)
	return;
	}
	#endif
	#ifdef PT_GETGSBASE
	if (regnum == -1 \|\| regnum == I386_GSBASE_REGNUM)
	{
	register_t base;

	if (gdb_ptrace (PT_GETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
	perror_with_name (_("Couldn't get segment register gs_base"));

	regcache->raw_supply (I386_GSBASE_REGNUM, &base);
	if (regnum != -1)
	return;
	}
	#endif

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

	#ifdef PT_GETXSTATE_INFO
	if (x86bsd_xsave_len != 0)
	{
	void *xstateregs;

	xstateregs = alloca (x86bsd_xsave_len);
	if (gdb_ptrace (PT_GETXSTATE, ptid,
	(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
	perror_with_name (_("Couldn't get extended state status"));

	i387_supply_xsave (regcache, -1, xstateregs);
	return;
	}
	#endif

	#ifdef HAVE_PT_GETXMMREGS
	if (have_ptrace_xmmregs != 0
	&& gdb_ptrace(PT_GETXMMREGS, ptid,
	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	have_ptrace_xmmregs = 1;
	i387_supply_fxsave (regcache, -1, xmmregs);
	}
	else
	{
	have_ptrace_xmmregs = 0;
	#endif
	if (gdb_ptrace (PT_GETFPREGS, ptid,
	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

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

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

	void
	i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)
	{
	ptid_t ptid = regcache->ptid ();

	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
	{
	struct reg regs;

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

	i386bsd_collect_gregset (regcache, &regs, regnum);

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

	if (regnum != -1)
	return;
	}

	#ifdef PT_SETFSBASE
	if (regnum == -1 \|\| regnum == I386_FSBASE_REGNUM)
	{
	register_t base;

	regcache->raw_collect (I386_FSBASE_REGNUM, &base);

	if (gdb_ptrace (PT_SETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
	perror_with_name (_("Couldn't write segment register fs_base"));
	if (regnum != -1)
	return;
	}
	#endif
	#ifdef PT_SETGSBASE
	if (regnum == -1 \|\| regnum == I386_GSBASE_REGNUM)
	{
	register_t base;

	regcache->raw_collect (I386_GSBASE_REGNUM, &base);

	if (gdb_ptrace (PT_SETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
	perror_with_name (_("Couldn't write segment register gs_base"));
	if (regnum != -1)
	return;
	}
	#endif

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

	#ifdef PT_GETXSTATE_INFO
	if (x86bsd_xsave_len != 0)
	{
	void *xstateregs;

	xstateregs = alloca (x86bsd_xsave_len);
	if (gdb_ptrace (PT_GETXSTATE, ptid,
	(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
	perror_with_name (_("Couldn't get extended state status"));

	i387_collect_xsave (regcache, -1, xstateregs, 0);

	if (gdb_ptrace (PT_SETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs,
	x86bsd_xsave_len) == -1)
	perror_with_name (_("Couldn't write extended state status"));
	return;
	}
	#endif

	#ifdef HAVE_PT_GETXMMREGS
	if (have_ptrace_xmmregs != 0
	&& gdb_ptrace(PT_GETXMMREGS, ptid,
	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	have_ptrace_xmmregs = 1;

	i387_collect_fxsave (regcache, regnum, xmmregs);

	if (gdb_ptrace (PT_SETXMMREGS, ptid,
	(PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
	perror_with_name (_("Couldn't write XMM registers"));
	}
	else
	{
	have_ptrace_xmmregs = 0;
	#endif
	if (gdb_ptrace (PT_GETFPREGS, ptid,
	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

	i387_collect_fsave (regcache, regnum, &fpregs);

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

	void _initialize_i386bsd_nat ();
	void
	_initialize_i386bsd_nat ()
	{
	/* To support the recognition of signal handlers, i386-bsd-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 (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. */
	int 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 */
	}