Merge GDB 7.5.1

gdb/amd64-linux-nat.c

 /* Native-dependent code for GNU/Linux x86-64.
 
    Copyright (C) 2001-2012 Free Software Foundation, Inc.
    Contributed by Jiri Smid, SuSE Labs.
 
    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
@@ skipping 16 matching lines @@
 #include "amd64-linux-tdep.h"
 
 #include "gdb_assert.h"
 #include "gdb_string.h"
 #include "elf/common.h"
 #include <sys/uio.h>
 #include <sys/ptrace.h>
 #include <sys/debugreg.h>
 #include <sys/syscall.h>
 #include <sys/procfs.h>
+#include <sys/user.h>
 #include <asm/prctl.h>
 /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
    <asm/ptrace.h> because the latter redefines FS and GS for no apparent
    reason, and those definitions don't match the ones that libpthread_db
    uses, which come from <sys/reg.h>.  */
 /* ezannoni-2003-07-09: I think this is fixed.  The extraneous defs have
    been removed from ptrace.h in the kernel.  However, better safe than
    sorry.  */
 #include <asm/ptrace.h>
 #include <sys/reg.h>
 #include "gdb_proc_service.h"
 
 /* Prototypes for supply_gregset etc.  */
 #include "gregset.h"
 
 #include "amd64-tdep.h"
 #include "i386-linux-tdep.h"
 #include "amd64-nat.h"
 #include "i386-nat.h"
 #include "i386-xstate.h"
 
 #ifndef PTRACE_GETREGSET
 #define PTRACE_GETREGSET        0x4204
 #endif
 
 #ifndef PTRACE_SETREGSET
 #define PTRACE_SETREGSET        0x4205
 #endif
 
+/* Per-thread arch-specific data we want to keep.  */
+
+struct arch_lwp_info
+{
+  /* Non-zero if our copy differs from what's recorded in the thread.  */
+  int debug_registers_changed;
+};
+
 /* Does the current host support PTRACE_GETREGSET?  */
 static int have_ptrace_getregset = -1;
 
 /* Mapping between the general-purpose registers in GNU/Linux x86-64
    `struct user' format and GDB's register cache layout for GNU/Linux
    i386.
 
    Note that most GNU/Linux x86-64 registers are 64-bit, while the
    GNU/Linux i386 registers are all 32-bit, but since we're
    little-endian we get away with that.  */
@@ skipping 178 matching lines @@
       else
         {
           if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
             perror_with_name (_("Couldn't get floating point status"));
 
           amd64_collect_fxsave (regcache, regnum, &fpregs);
 
           if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
             perror_with_name (_("Couldn't write floating point status"));
         }