path: root/devel/gdb/files/commit-a3405d1

commit a3405d124e1388b613a35af49f19f0cc1b8d959d
Author: John Baldwin <jhb@FreeBSD.org>
Date:   Mon Jun 27 13:19:09 2016 -0700

    Consolidate x86 debug register code for BSD native targets.
    
    Move the debug register support code from amd64bsd-nat.c and
    i386bsd-nat.c into a shared x86bsd-nat.c.
    
    Instead of setting up x86_dr_low in amd64fbsd-nat.c and
    i386fbsd-nat.c, add a x86bsd_target function that creates a new target
    that inherits from inf_ptrace and sets up x86 debug registers if
    supported.  In addition to initializing x86_dr_low, the x86bsd target
    installs a custom mourn_inferior target operation to clean up the
    x86 debug register state.  Previously this was only done on amd64.
    Now it will be done for both i386 and amd64.  The i386bsd_target and
    amd64bsd_target functions create targets that inherit from x86bsd
    rather than inf_ptrace.
    
    gdb/ChangeLog:
    
    	* Makefile.in [HFILES_NO_SRCDIR]: Replace 'amd64bsd-nat.h' with
    	'x86bsd-nat.h'.
    	* amd64bsd-nat.c: Include 'x86bsd-nat.h' instead of
    	'amd64bsd-nat.h'.
    	(amd64bsd_xsave_len): Rename and move to x86bsd-nat.c.
    	(amd64bsd_fetch_inferior_registers): Replace 'amd64bsd_xsave_len'
    	with 'x86bsd_xsave_len'.
    	(amd64bsd_store_inferior_registers): Likewise.
    	(amd64bsd_target): Inherit from x86bsd_target.
    	(amd64bsd_dr_get): Rename and move to x86bsd-nat.c.
    	(amd64bsd_dr_set): Likewise.
    	(amd64bsd_dr_set_control): Likewise.
    	(amd64bsd_dr_set_addr): Likewise.
    	(amd64bsd_dr_get_addr): Likewise.
    	(amd64bsd_dr_get_status): Likewise.
    	(amd64bsd_dr_get_control): Likewise.
    	* amd64fbsd-nat.c: Include 'x86bsd-nat.h' instead of
    	'amd64bsd-nat.h'.
    	(super_mourn_inferior): Move to x86bsd-nat.c.
    	(amd64fbsd_mourn_inferior): Rename and move to x86bsd-nat.c.
    	(amd64fbsd_read_description): Replace 'amd64bsd_xsave_len' with
    	'x86bsd_xsave_len'.
    	(_initialize_amd64fbsd_nat): Remove x86 watchpoint setup and
    	mourn_inferior' target op.
    	* config/i386/fbsd.mh (NATDEPFILES): Add x86bsd-nat.o.
    	* config/i386/fbsd64.mh: Likewise.
    	* config/i386/nbsd64.mh: Likewise.
    	* config/i386/nbsdelf.mh: Likewise.
    	* config/i386/obsd.mh: Likewise.
    	* config/i386/obsd64.mh: Likewise.
    	* i386bsd-nat.c: Include 'x86bsd-nat.h'.
    	(i386bsd_xsave_len): Rename and move to x86bsd-nat.c.
    	(i386bsd_fetch_inferior_registers): Replace 'i386bsd_xsave_len'
    	with 'x86bsd_xsave_len'.
    	(i386bsd_store_inferior_registers): Likewise.
    	(i386bsd_target): Inherit from x86bsd_target.
    	(i386bsd_dr_get): Rename and move to x86bsd-nat.c.
    	(i386bsd_dr_set): Likewise.
    	(i386bsd_dr_set_control): Likewise.
    	(i386bsd_dr_set_addr): Likewise.
    	(i386bsd_dr_get_addr): Likewise.
    	(i386bsd_dr_get_status): Likewise.
    	(i386bsd_dr_get_control): Likewise.
    	* i386bsd-nat.h (i386bsd_xsave_len): Remove.
    	(i386bsd_dr_set_control): Remove.
    	(i386bsd_dr_set_addr): Remove.
    	(i386bsd_dr_get_addr): Remove.
    	(i386bsd_dr_get_status): Remove.
    	(i386bsd_dr_get_control): Remove.
    	* i386fbsd-nat.c: Include 'x86bsd-nat.h'.
    	(i386fbsd_read_description): Replace 'i386bsd_xsave_len' with
    	'x86bsd_xsave_len'.
    	(_initialize_i386fbsd_nat): Remove x86 watchpoint setup and
    	mourn_inferior' target op.
    	* x86bsd-nat.c: New file.
    	* x86bsd-nat.h: New file.

diff --git gdb/Makefile.in gdb/Makefile.in
index 16d5f27..5af6103 100644
--- gdb/Makefile.in
+++ gdb/Makefile.in
@@ -912,7 +912,7 @@ common/gdb_signals.h nat/gdb_thread_db.h common/gdb_vecs.h \
 common/x86-xstate.h nat/linux-ptrace.h nat/mips-linux-watch.h \
 proc-utils.h aarch64-tdep.h arm-tdep.h ax-gdb.h ppcfbsd-tdep.h \
 ppcnbsd-tdep.h cli-out.h gdb_expat.h breakpoint.h infcall.h obsd-tdep.h \
-exec.h m32r-tdep.h osabi.h gdbcore.h amd64bsd-nat.h \
+exec.h m32r-tdep.h osabi.h gdbcore.h x86bsd-nat.h \
 i386bsd-nat.h xml-support.h xml-tdesc.h alphabsd-tdep.h gdb_obstack.h \
 ia64-tdep.h ada-lang.h varobj.h varobj-iter.h frv-tdep.h \
 nto-tdep.h serial.h \
diff --git gdb/amd64bsd-nat.c gdb/amd64bsd-nat.c
index e278a91..b87672a 100644
--- gdb/amd64bsd-nat.c
+++ gdb/amd64bsd-nat.c
@@ -31,14 +31,10 @@
 
 #include "amd64-tdep.h"
 #include "amd64-nat.h"
-#include "amd64bsd-nat.h"
+#include "x86bsd-nat.h"
 #include "inf-ptrace.h"
 
 
-#ifdef PT_GETXSTATE_INFO
-size_t amd64bsd_xsave_len;
-#endif
-
 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
    for all registers (including the floating-point registers).  */
 
@@ -67,9 +63,9 @@ amd64bsd_fetch_inferior_registers (struct target_ops *ops,
 #ifdef PT_GETXSTATE_INFO
       void *xstateregs;
 
-      if (amd64bsd_xsave_len != 0)
+      if (x86bsd_xsave_len != 0)
 	{
-	  xstateregs = alloca (amd64bsd_xsave_len);
+	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
 		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));
@@ -120,9 +116,9 @@ amd64bsd_store_inferior_registers (struct target_ops *ops,
 #ifdef PT_GETXSTATE_INFO
       void *xstateregs;
 
-      if (amd64bsd_xsave_len != 0)
+      if (x86bsd_xsave_len != 0)
 	{
-	  xstateregs = alloca (amd64bsd_xsave_len);
+	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
 		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));
@@ -130,7 +126,7 @@ amd64bsd_store_inferior_registers (struct target_ops *ops,
 	  amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 
 	  if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid),
-		      (PTRACE_TYPE_ARG3) xstateregs, amd64bsd_xsave_len) == -1)
+		      (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1)
 	    perror_with_name (_("Couldn't write extended state status"));
 	  return;
 	}
@@ -156,80 +152,8 @@ amd64bsd_target (void)
 {
   struct target_ops *t;
 
-  t = inf_ptrace_target ();
+  t = x86bsd_target ();
   t->to_fetch_registers = amd64bsd_fetch_inferior_registers;
   t->to_store_registers = amd64bsd_store_inferior_registers;
   return t;
 }
-
-
-/* Support for debug registers.  */
-
-#ifdef HAVE_PT_GETDBREGS
-
-static unsigned long
-amd64bsd_dr_get (ptid_t ptid, int regnum)
-{
-  struct dbreg dbregs;
-
-  if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
-	      (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
-    perror_with_name (_("Couldn't read debug registers"));
-
-  return DBREG_DRX ((&dbregs), regnum);
-}
-
-static void
-amd64bsd_dr_set (int regnum, unsigned long value)
-{
-  struct dbreg dbregs;
-
-  if (ptrace (PT_GETDBREGS, get_ptrace_pid (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) &= ~(0xffffffff0000fc00);
-
-  DBREG_DRX ((&dbregs), regnum) = value;
-
-  if (ptrace (PT_SETDBREGS, get_ptrace_pid (inferior_ptid),
-              (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
-    perror_with_name (_("Couldn't write debug registers"));
-}
-
-void
-amd64bsd_dr_set_control (unsigned long control)
-{
-  amd64bsd_dr_set (7, control);
-}
-
-void
-amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr)
-{
-  gdb_assert (regnum >= 0 && regnum <= 4);
-
-  amd64bsd_dr_set (regnum, addr);
-}
-
-CORE_ADDR
-amd64bsd_dr_get_addr (int regnum)
-{
-  return amd64bsd_dr_get (inferior_ptid, regnum);
-}
-
-unsigned long
-amd64bsd_dr_get_status (void)
-{
-  return amd64bsd_dr_get (inferior_ptid, 6);
-}
-
-unsigned long
-amd64bsd_dr_get_control (void)
-{
-  return amd64bsd_dr_get (inferior_ptid, 7);
-}
-
-#endif /* PT_GETDBREGS */
diff --git gdb/amd64bsd-nat.h gdb/amd64bsd-nat.h
deleted file mode 100644
index f6a4022..0000000
--- gdb/amd64bsd-nat.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Native-dependent code for AMD64 BSD's.
-
-   Copyright (C) 2011-2016 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/>.  */
-
-#ifndef AMD64BSD_NAT_H
-#define AMD64BSD_NAT_H
-
-/* Low level amd64 XSAVE info.  */
-extern size_t amd64bsd_xsave_len;
-
-/* Low level amd64 debug register functions.  */
-
-extern void amd64bsd_dr_set_control (unsigned long control);
-
-extern void amd64bsd_dr_set_addr (int regnum, CORE_ADDR addr);
-
-extern CORE_ADDR amd64bsd_dr_get_addr (int regnum);
-
-extern unsigned long amd64bsd_dr_get_status (void);
-
-extern unsigned long amd64bsd_dr_get_control (void);
-
-#endif /* amd64bsd-nat.h */
diff --git gdb/amd64fbsd-nat.c gdb/amd64fbsd-nat.c
index 63a7197..66c374c 100644
--- gdb/amd64fbsd-nat.c
+++ gdb/amd64fbsd-nat.c
@@ -32,7 +32,7 @@
 #include "fbsd-nat.h"
 #include "amd64-tdep.h"
 #include "amd64-nat.h"
-#include "amd64bsd-nat.h"
+#include "x86bsd-nat.h"
 #include "x86-nat.h"
 
 
@@ -140,17 +140,6 @@ amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 }
 
 
-static void (*super_mourn_inferior) (struct target_ops *ops);
-
-static void
-amd64fbsd_mourn_inferior (struct target_ops *ops)
-{
-#ifdef HAVE_PT_GETDBREGS
-  x86_cleanup_dregs ();
-#endif
-  super_mourn_inferior (ops);
-}
-
 /* Implement the to_read_description method.  */
 
 static const struct target_desc *
@@ -175,13 +164,13 @@ amd64fbsd_read_description (struct target_ops *ops)
       if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
 		  (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
 	{
-	  amd64bsd_xsave_len = info.xsave_len;
+	  x86bsd_xsave_len = info.xsave_len;
 	  xcr0 = info.xsave_mask;
 	}
       xsave_probed = 1;
     }
 
-  if (amd64bsd_xsave_len != 0)
+  if (x86bsd_xsave_len != 0)
     {
       if (is64)
 	return amd64_target_description (xcr0);
@@ -209,22 +198,6 @@ _initialize_amd64fbsd_nat (void)
 
   /* Add some extra features to the common *BSD/i386 target.  */
   t = amd64bsd_target ();
-
-#ifdef HAVE_PT_GETDBREGS
-
-  x86_use_watchpoints (t);
-
-  x86_dr_low.set_control = amd64bsd_dr_set_control;
-  x86_dr_low.set_addr = amd64bsd_dr_set_addr;
-  x86_dr_low.get_addr = amd64bsd_dr_get_addr;
-  x86_dr_low.get_status = amd64bsd_dr_get_status;
-  x86_dr_low.get_control = amd64bsd_dr_get_control;
-  x86_set_debug_register_length (8);
-
-#endif /* HAVE_PT_GETDBREGS */
-
-  super_mourn_inferior = t->to_mourn_inferior;
-  t->to_mourn_inferior = amd64fbsd_mourn_inferior;
   t->to_read_description = amd64fbsd_read_description;
 
   fbsd_nat_add_target (t);
diff --git gdb/config/i386/fbsd.mh gdb/config/i386/fbsd.mh
index e5bff3a..1db6660 100644
--- gdb/config/i386/fbsd.mh
+++ gdb/config/i386/fbsd.mh
@@ -1,7 +1,7 @@
 # Host: FreeBSD/i386
 NATDEPFILES= fork-child.o inf-ptrace.o \
-	fbsd-nat.o x86-nat.o x86-dregs.o i386bsd-nat.o i386fbsd-nat.o \
-	bsd-kvm.o
+	fbsd-nat.o x86-nat.o x86-dregs.o x86bsd-nat.o i386bsd-nat.o \
+	i386fbsd-nat.o bsd-kvm.o
 NAT_FILE= nm-fbsd.h
 HAVE_NATIVE_GCORE_HOST = 1
 
diff --git gdb/config/i386/fbsd64.mh gdb/config/i386/fbsd64.mh
index 329c526..e196c00 100644
--- gdb/config/i386/fbsd64.mh
+++ gdb/config/i386/fbsd64.mh
@@ -1,7 +1,7 @@
 # Host: FreeBSD/amd64
 NATDEPFILES= fork-child.o inf-ptrace.o \
 	fbsd-nat.o amd64-nat.o amd64bsd-nat.o amd64fbsd-nat.o \
-	bsd-kvm.o x86-nat.o x86-dregs.o
+	bsd-kvm.o x86-nat.o x86-dregs.o x86bsd-nat.o
 HAVE_NATIVE_GCORE_HOST = 1
 
 LOADLIBES= -lkvm
diff --git gdb/config/i386/nbsd64.mh gdb/config/i386/nbsd64.mh
index 5de8cf5..5fa369f 100644
--- gdb/config/i386/nbsd64.mh
+++ gdb/config/i386/nbsd64.mh
@@ -1,3 +1,3 @@
 # Host: NetBSD/amd64
 NATDEPFILES= fork-child.o inf-ptrace.o \
-	nbsd-nat.o amd64-nat.o amd64bsd-nat.o amd64nbsd-nat.o
+	nbsd-nat.o amd64-nat.o x86bsd-nat.o amd64bsd-nat.o amd64nbsd-nat.o
diff --git gdb/config/i386/nbsdelf.mh gdb/config/i386/nbsdelf.mh
index d27c842..f8b9d6c 100644
--- gdb/config/i386/nbsdelf.mh
+++ gdb/config/i386/nbsdelf.mh
@@ -1,5 +1,5 @@
 # Host: NetBSD/i386 ELF
 NATDEPFILES= fork-child.o inf-ptrace.o \
-	nbsd-nat.o i386bsd-nat.o i386nbsd-nat.o bsd-kvm.o
+	nbsd-nat.o x86bsd-nat.o i386bsd-nat.o i386nbsd-nat.o bsd-kvm.o
 
 LOADLIBES= -lkvm
diff --git gdb/config/i386/obsd.mh gdb/config/i386/obsd.mh
index a9041f4..3845d26 100644
--- gdb/config/i386/obsd.mh
+++ gdb/config/i386/obsd.mh
@@ -1,5 +1,5 @@
 # Host: OpenBSD/i386 ELF
 NATDEPFILES= fork-child.o inf-ptrace.o obsd-nat.o \
-	i386bsd-nat.o i386obsd-nat.o bsd-kvm.o
+	x86bsd-nat.o i386bsd-nat.o i386obsd-nat.o bsd-kvm.o
 
 LOADLIBES= -lkvm
diff --git gdb/config/i386/obsd64.mh gdb/config/i386/obsd64.mh
index 386a582..2a8c42c 100644
--- gdb/config/i386/obsd64.mh
+++ gdb/config/i386/obsd64.mh
@@ -1,5 +1,5 @@
 # Host: OpenBSD/amd64
 NATDEPFILES= fork-child.o inf-ptrace.o obsd-nat.o \
-	amd64-nat.o amd64bsd-nat.o amd64obsd-nat.o bsd-kvm.o
+	amd64-nat.o x86bsd-nat.o amd64bsd-nat.o amd64obsd-nat.o bsd-kvm.o
 
 LOADLIBES= -lkvm
diff --git gdb/i386bsd-nat.c gdb/i386bsd-nat.c
index f5f4a0f..b6b143b 100644
--- gdb/i386bsd-nat.c
+++ gdb/i386bsd-nat.c
@@ -29,6 +29,7 @@
 
 #include "i386-tdep.h"
 #include "i387-tdep.h"
+#include "x86bsd-nat.h"
 #include "i386bsd-nat.h"
 #include "inf-ptrace.h"
 
@@ -81,10 +82,6 @@ static int i386bsd_r_reg_offset[] =
    so that we try PT_GETXMMREGS the first time around.  */
 static int have_ptrace_xmmregs = -1;
 #endif
-
-#ifdef PT_GETXSTATE_INFO
-size_t i386bsd_xsave_len;
-#endif
 
 
 /* Supply the general-purpose registers in GREGS, to REGCACHE.  */
@@ -155,11 +152,11 @@ i386bsd_fetch_inferior_registers (struct target_ops *ops,
 #endif
 
 #ifdef PT_GETXSTATE_INFO
-      if (i386bsd_xsave_len != 0)
+      if (x86bsd_xsave_len != 0)
 	{
 	  void *xstateregs;
 
-	  xstateregs = alloca (i386bsd_xsave_len);
+	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
 		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));
@@ -225,11 +222,11 @@ i386bsd_store_inferior_registers (struct target_ops *ops,
 #endif
 
 #ifdef PT_GETXSTATE_INFO
-      if (i386bsd_xsave_len != 0)
+      if (x86bsd_xsave_len != 0)
 	{
 	  void *xstateregs;
 
-	  xstateregs = alloca (i386bsd_xsave_len);
+	  xstateregs = alloca (x86bsd_xsave_len);
 	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
 		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
 	    perror_with_name (_("Couldn't get extended state status"));
@@ -237,7 +234,7 @@ i386bsd_store_inferior_registers (struct target_ops *ops,
 	  i387_collect_xsave (regcache, -1, xstateregs, 0);
 
 	  if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid),
-		      (PTRACE_TYPE_ARG3) xstateregs, i386bsd_xsave_len) == -1)
+		      (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1)
 	    perror_with_name (_("Couldn't write extended state status"));
 	  return;
 	}
@@ -283,91 +280,13 @@ i386bsd_target (void)
 {
   struct target_ops *t;
 
-  t = inf_ptrace_target ();
+  t = x86bsd_target ();
   t->to_fetch_registers = i386bsd_fetch_inferior_registers;
   t->to_store_registers = i386bsd_store_inferior_registers;
   return t;
 }
 
 
-/* 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 unsigned long
-i386bsd_dr_get (ptid_t ptid, int regnum)
-{
-  struct dbreg dbregs;
-
-  if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
-	      (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
-    perror_with_name (_("Couldn't read debug registers"));
-
-  return DBREG_DRX ((&dbregs), regnum);
-}
-
-static void
-i386bsd_dr_set (int regnum, unsigned int value)
-{
-  struct dbreg dbregs;
-
-  if (ptrace (PT_GETDBREGS, get_ptrace_pid (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, get_ptrace_pid (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);
-}
-
-CORE_ADDR
-i386bsd_dr_get_addr (int regnum)
-{
-  return i386bsd_dr_get (inferior_ptid, regnum);
-}
-
-unsigned long
-i386bsd_dr_get_status (void)
-{
-  return i386bsd_dr_get (inferior_ptid, 6);
-}
-
-unsigned long
-i386bsd_dr_get_control (void)
-{
-  return i386bsd_dr_get (inferior_ptid, 7);
-}
-
-#endif /* PT_GETDBREGS */
-
-
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 void _initialize_i386bsd_nat (void);
 
diff --git gdb/i386bsd-nat.h gdb/i386bsd-nat.h
index 78ea551..1b51d19 100644
--- gdb/i386bsd-nat.h
+++ gdb/i386bsd-nat.h
@@ -25,19 +25,4 @@
 
 extern struct target_ops *i386bsd_target (void);
 
-/* Low level i386 XSAVE info.  */
-extern size_t i386bsd_xsave_len;
-
-/* low level i386 debug register functions used in i386fbsd-nat.c.  */
-
-extern void i386bsd_dr_set_control (unsigned long control);
-
-extern void i386bsd_dr_set_addr (int regnum, CORE_ADDR addr);
-
-extern CORE_ADDR i386bsd_dr_get_addr (int regnum);
-
-extern unsigned long i386bsd_dr_get_status (void);
-
-extern unsigned long i386bsd_dr_get_control (void);
-
 #endif /* i386bsd-nat.h */
diff --git gdb/i386fbsd-nat.c gdb/i386fbsd-nat.c
index 7d371a6..716b513 100644
--- gdb/i386fbsd-nat.c
+++ gdb/i386fbsd-nat.c
@@ -30,6 +30,7 @@
 #include "fbsd-nat.h"
 #include "i386-tdep.h"
 #include "x86-nat.h"
+#include "x86bsd-nat.h"
 #include "i386bsd-nat.h"
 
 /* Resume execution of the inferior process.  If STEP is nonzero,
@@ -132,13 +133,13 @@ i386fbsd_read_description (struct target_ops *ops)
       if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
 		  (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
 	{
-	  i386bsd_xsave_len = info.xsave_len;
+	  x86bsd_xsave_len = info.xsave_len;
 	  xcr0 = info.xsave_mask;
 	}
       xsave_probed = 1;
     }
 
-  if (i386bsd_xsave_len != 0)
+  if (x86bsd_xsave_len != 0)
     {
       return i386_target_description (xcr0);
     }
@@ -158,19 +159,6 @@ _initialize_i386fbsd_nat (void)
   /* Add some extra features to the common *BSD/i386 target.  */
   t = i386bsd_target ();
 
-#ifdef HAVE_PT_GETDBREGS
-
-  x86_use_watchpoints (t);
-
-  x86_dr_low.set_control = i386bsd_dr_set_control;
-  x86_dr_low.set_addr = i386bsd_dr_set_addr;
-  x86_dr_low.get_addr = i386bsd_dr_get_addr;
-  x86_dr_low.get_status = i386bsd_dr_get_status;
-  x86_dr_low.get_control = i386bsd_dr_get_control;
-  x86_set_debug_register_length (4);
-
-#endif /* HAVE_PT_GETDBREGS */
-
 #ifdef PT_GETXSTATE_INFO
   t->to_read_description = i386fbsd_read_description;
 #endif
diff --git gdb/x86bsd-nat.c gdb/x86bsd-nat.c
new file mode 100644
index 0000000..0c56848
--- /dev/null
+++ gdb/x86bsd-nat.c
@@ -0,0 +1,150 @@
+/* Native-dependent code for X86 BSD's.
+
+   Copyright (C) 2003-2016 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"
+
+/* We include <signal.h> to make sure `struct fxsave64' is defined on
+   NetBSD, since NetBSD's <machine/reg.h> needs it.  */
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include "x86-nat.h"
+#include "x86bsd-nat.h"
+#include "inf-ptrace.h"
+
+
+#ifdef PT_GETXSTATE_INFO
+size_t x86bsd_xsave_len;
+#endif
+
+/* Support for debug registers.  */
+
+#ifdef HAVE_PT_GETDBREGS
+static void (*super_mourn_inferior) (struct target_ops *ops);
+
+/* Implement the "to_mourn_inferior" target_ops method.  */
+
+static void
+x86bsd_mourn_inferior (struct target_ops *ops)
+{
+  x86_cleanup_dregs ();
+  super_mourn_inferior (ops);
+}
+
+/* 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 unsigned long
+x86bsd_dr_get (ptid_t ptid, int regnum)
+{
+  struct dbreg dbregs;
+
+  if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
+	      (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+    perror_with_name (_("Couldn't read debug registers"));
+
+  return DBREG_DRX ((&dbregs), regnum);
+}
+
+static void
+x86bsd_dr_set (int regnum, unsigned long value)
+{
+  struct dbreg dbregs;
+
+  if (ptrace (PT_GETDBREGS, get_ptrace_pid (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) &= ~(0xffffffff0000fc00);
+
+  DBREG_DRX ((&dbregs), regnum) = value;
+
+  if (ptrace (PT_SETDBREGS, get_ptrace_pid (inferior_ptid),
+              (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
+    perror_with_name (_("Couldn't write debug registers"));
+}
+
+static void
+x86bsd_dr_set_control (unsigned long control)
+{
+  x86bsd_dr_set (7, control);
+}
+
+static void
+x86bsd_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+  gdb_assert (regnum >= 0 && regnum <= 4);
+
+  x86bsd_dr_set (regnum, addr);
+}
+
+static CORE_ADDR
+x86bsd_dr_get_addr (int regnum)
+{
+  return x86bsd_dr_get (inferior_ptid, regnum);
+}
+
+static unsigned long
+x86bsd_dr_get_status (void)
+{
+  return x86bsd_dr_get (inferior_ptid, 6);
+}
+
+static unsigned long
+x86bsd_dr_get_control (void)
+{
+  return x86bsd_dr_get (inferior_ptid, 7);
+}
+
+#endif /* PT_GETDBREGS */
+
+/* Create a prototype *BSD/x86 target.  The client can override it
+   with local methods.  */
+
+struct target_ops *
+x86bsd_target (void)
+{
+  struct target_ops *t;
+
+  t = inf_ptrace_target ();
+
+#ifdef HAVE_PT_GETDBREGS
+  x86_use_watchpoints (t);
+
+  x86_dr_low.set_control = x86bsd_dr_set_control;
+  x86_dr_low.set_addr = x86bsd_dr_set_addr;
+  x86_dr_low.get_addr = x86bsd_dr_get_addr;
+  x86_dr_low.get_status = x86bsd_dr_get_status;
+  x86_dr_low.get_control = x86bsd_dr_get_control;
+  x86_set_debug_register_length (sizeof (void *));
+  super_mourn_inferior = t->to_mourn_inferior;
+  t->to_mourn_inferior = x86bsd_mourn_inferior;
+#endif /* HAVE_PT_GETDBREGS */
+
+  return t;
+}
diff --git gdb/x86bsd-nat.h gdb/x86bsd-nat.h
new file mode 100644
index 0000000..6d39697
--- /dev/null
+++ gdb/x86bsd-nat.h
@@ -0,0 +1,31 @@
+/* Native-dependent code for x86 BSD's.
+
+   Copyright (C) 2011-2016 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/>.  */
+
+#ifndef X86BSD_NAT_H
+#define X86BSD_NAT_H
+
+/* Low level x86 XSAVE info.  */
+extern size_t x86bsd_xsave_len;
+
+/* Create a prototype *BSD/x86 target.  The client can override it
+   with local methods.  */
+
+extern struct target_ops *x86bsd_target (void);
+
+#endif /* x86bsd-nat.h */