* config/i386/x86-64linux.mh: New file.

* config/i386/x86-64linux.mt: New file.
* config/i386/nm-x86_64.h: New file.
* x86-64-linux-tdep.c: New file.
* x86-64-linux-nat.c: New file.
* x86-64-tdep.c: New file.
* x86-64-tdep.h: New file.
* config/djgpp/fnchange.lst: Add entries for x86_64-linux-tdep.c
and x86_64-linux-nat.c
* Makefile.in: Add x86_64-linux-tdep.o, x86_64-tdep.o,
x86_64-linux-tdep.o, x86_64-nat.o, update dependencies.

9 files changed, 1886 insertions, 1 deletions

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 5844aea..eb6b638 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1552,7 +1552,7 @@ i386-linux-tdep.o: i386-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
 i386v4-nat.o: i386v4-nat.c $(defs_h) $(regcache_h)
 
 i387-tdep.o: i387-tdep.c $(floatformat_h) $(defs_h) $(gdbcore_h) \
-	$(inferior_h) language.h $(regcache_h) $(doublest_h)
+	$(inferior_h) language.h $(regcache_h) $(doublest_h) i386-tdep.h
 
 i960-tdep.o: i960-tdep.c $(floatformat_h) $(defs_h) $(expression_h) \
 	$(frame_h) $(gdbtypes_h) $(symtab_h) $(value_h) $(gdbcore_h) \
@@ -2077,6 +2077,15 @@ vax-tdep.o: vax-tdep.c $(OP_INCLUDE)/vax.h $(defs_h) $(symtab_h)
 
 w65-tdep.o : w65-tdep.c $(gdbcore_h) $(regcache_h)
 
+x86-64-linux-tdep.o : x86-64-linux-tdep.c $(defs_h) $(inferior_h) $(gdbcore_h) \
+	$(regcache_h) x86-64-tdep.h i386-tdep.h
+
+x86-64-tdep.o : x86-64-tdep.c $(defs_h) $(inferior_h) $(gdbcore_h) $(gdbcmd_h) \
+	$(arch_utils_h) $(regcache_h) $(symfile_h) x86-64-tdep.h i386-tdep.h
+
+x86-64-linux-tdep.o : x86-64-linux-tdep.c $(defs_h) $(inferior_h) $(gdbcore_h) \
+	$(regcache_h) i387-nat.h x86-64-tdep.h i386-tdep.h
+
 win32-nat.o: win32-nat.c $(gdbcmd_h) $(gdbcore_h) $(inferior_h) $(defs_h) \
 	$(gdb_string_h) $(regcache_h) $(completer_h)
 
diff --git a/gdb/config/djgpp/fnchange.lst b/gdb/config/djgpp/fnchange.lst
index 5150656..ba8d034 100644
--- a/gdb/config/djgpp/fnchange.lst
+++ b/gdb/config/djgpp/fnchange.lst
@@ -202,6 +202,8 @@
 @V@/gdb/testsuite/gdb.mi/mi0-var-display.exp @V@/gdb/testsuite/gdb.mi/mi0vardisplay.exp
 @V@/gdb/tui/tuiSourceWin.c @V@/gdb/tui/tuiWinSource.c
 @V@/gdb/tui/tuiSourceWin.h @V@/gdb/tui/tuiWinSource.h
+@V@/gdb/x86-64-linux-tdep.c @V@/gdb/x8664-ltdep.c
+@V@/gdb/x86-64-linux-nat.c @V@/gdb/x8664-lnat.c
 @V@/intl/intlh.inst.in @V@/intl/intlh_inst.in
 @V@/intl/po2tbl.sed.in @V@/intl/po2tblsed.in
 @V@/itcl/itcl/itclConfig.sh.in @V@/itcl/itcl/itclConfig.sh-in
diff --git a/gdb/config/i386/nm-x86-64.h b/gdb/config/i386/nm-x86-64.h
new file mode 100644
index 0000000..bbbea9f
--- /dev/null
+++ b/gdb/config/i386/nm-x86-64.h
@@ -0,0 +1,100 @@
+/* Native support for Linux/x86-64.
+   Copyright 2001
+   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 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.  */
+
+#ifndef NM_X86_64_H
+#define NM_X86_64_H
+
+#include "nm-linux.h"
+
+#define I386_USE_GENERIC_WATCHPOINTS
+#include "i386/nm-i386.h"
+
+/* Support for 8-byte wide hw watchpoints.  */
+#define TARGET_HAS_DR_LEN_8 1
+
+/* Provide access to the i386 hardware debugging registers.  */
+
+extern void x86_64_linux_dr_set_control (unsigned long control);
+#define I386_DR_LOW_SET_CONTROL(control) \
+  x86_64_linux_dr_set_control (control)
+
+extern void x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr);
+#define I386_DR_LOW_SET_ADDR(regnum, addr) \
+  x86_64_linux_dr_set_addr (regnum, addr)
+
+extern void x86_64_linux_dr_reset_addr (int regnum);
+#define I386_DR_LOW_RESET_ADDR(regnum) \
+  x86_64_linux_dr_reset_addr (regnum)
+
+extern unsigned long x86_64_linux_dr_get_status (void);
+#define I386_DR_LOW_GET_STATUS() \
+  x86_64_linux_dr_get_status ()
+
+
+#define REGISTER_U_ADDR(addr, blockend, regno) \
+	(addr) = x86_64_register_u_addr ((blockend),(regno));
+CORE_ADDR x86_64_register_u_addr (CORE_ADDR, int);
+
+/* Return the size of the user struct.  */
+#define KERNEL_U_SIZE kernel_u_size()
+extern int kernel_u_size (void);
+
+/* Offset of the registers within the user area.  */
+#define U_REGS_OFFSET 0
+
+/* This is the amount to subtract from u.u_ar0
+   to get the offset in the core file of the register values.  */
+#define KERNEL_U_ADDR 0x0
+
+/* FIXME use special child_xfer_memory.  */
+#define CHILD_XFER_MEMORY
+
+#define PTRACE_ARG3_TYPE void*
+
+
+/* We define this if link.h is available, because with ELF we use SVR4 style
+   shared libraries. */
+
+#ifdef HAVE_LINK_H
+#define SVR4_SHARED_LIBS
+#include "solib.h"		/* Support for shared libraries. */
+#endif
+
+/* Override copies of {fetch,store}_inferior_registers in `infptrace.c'.  */
+#define FETCH_INFERIOR_REGISTERS
+
+/* Override child_resume in `infptrace.c'.  */
+#define CHILD_RESUME
+
+// extern int lin_lwp_prepare_to_proceed (void);
+#undef PREPARE_TO_PROCEED
+// #define PREPARE_TO_PROCEED(select_it) lin_lwp_prepare_to_proceed ()
+
+extern void lin_lwp_attach_lwp (ptid_t pid, int verbose);
+#define ATTACH_LWP(pid, verbose) lin_lwp_attach_lwp ((pid), (verbose))
+
+#include <signal.h>
+
+extern void lin_thread_get_thread_signals (sigset_t * mask);
+#define GET_THREAD_SIGNALS(mask) lin_thread_get_thread_signals (mask)
+
+#endif /* NM_X86_64.h */
diff --git a/gdb/config/i386/x86-64linux.mh b/gdb/config/i386/x86-64linux.mh
new file mode 100644
index 0000000..0bf1092
--- /dev/null
+++ b/gdb/config/i386/x86-64linux.mh
@@ -0,0 +1,11 @@
+# Host: AMD x86-64 running GNU/Linux
+
+XM_FILE= xm-i386.h
+XDEPFILES=
+
+NAT_FILE= nm-x86-64.h
+NATDEPFILES= infptrace.o inftarg.o fork-child.o corelow.o \
+	core-aout.o i386-nat.o x86-64-nat.o x86-64-linux-nat.o \
+	i387-nat.o proc-service.o thread-db.o lin-lwp.o
+
+LOADLIBES = -ldl -rdynamic
diff --git a/gdb/config/i386/x86-64linux.mt b/gdb/config/i386/x86-64linux.mt
new file mode 100644
index 0000000..be6321a
--- /dev/null
+++ b/gdb/config/i386/x86-64linux.mt
@@ -0,0 +1,5 @@
+# Target: AMD x86-64 running GNU/Linux
+TDEPFILES= x86-64-tdep.o x86-64-linux-tdep.o i387-tdep.o dwarf2cfi.o \
+	solib.o solib-svr4.o solib-legacy.o
+
+GDBSERVER_DEPFILES= low-linux.o
diff --git a/gdb/x86-64-linux-nat.c b/gdb/x86-64-linux-nat.c
new file mode 100644
index 0000000..268aad5
--- /dev/null
+++ b/gdb/x86-64-linux-nat.c
@@ -0,0 +1,563 @@
+/* Native-dependent code for Linux/x86-64.
+   Copyright 2001
+   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 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 "gdbcore.h"
+#include "regcache.h"
+#include "i387-nat.h"
+#include "gdb_assert.h"
+#include "x86-64-tdep.h"
+
+#include <sys/ptrace.h>
+#include <sys/debugreg.h>
+#include <sys/syscall.h>
+#include <sys/procfs.h>
+
+static unsigned long
+x86_64_linux_dr_get (int regnum)
+{
+  int tid;
+  unsigned long value;
+
+  /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+     multi-threaded processes here.  For now, pretend there is just
+     one thread.  */
+  tid = PIDGET (inferior_ptid);
+
+  /* FIXME: kettenis/2001-03-27: 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 vectore.  For now, just return zero if the
+     ptrace call fails.  */
+  errno = 0;
+  value = ptrace (PT_READ_U, tid,
+		  offsetof (struct user, u_debugreg[regnum]), 0);
+  if (errno != 0)
+#if 0
+    perror_with_name ("Couldn't read debug register");
+#else
+    return 0;
+#endif
+
+  return value;
+}
+
+static void
+x86_64_linux_dr_set (int regnum, unsigned long value)
+{
+  int tid;
+
+  /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+     multi-threaded processes here.  For now, pretend there is just
+     one thread.  */
+  tid = PIDGET (inferior_ptid);
+
+  errno = 0;
+  ptrace (PT_WRITE_U, tid,
+	  offsetof (struct user, u_debugreg[regnum]), value);
+  if (errno != 0)
+    perror_with_name ("Couldn't write debug register");
+}
+
+void
+x86_64_linux_dr_set_control (unsigned long control)
+{
+  x86_64_linux_dr_set (DR_CONTROL, control);
+}
+
+void
+x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+  x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+}
+
+void
+x86_64_linux_dr_reset_addr (int regnum)
+{
+  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+  x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+}
+
+unsigned long
+x86_64_linux_dr_get_status (void)
+{
+  return x86_64_linux_dr_get (DR_STATUS);
+}
+
+
+/* The register sets used in Linux ELF core-dumps are identical to the
+   register sets used by `ptrace'.  */
+
+#define GETREGS_SUPPLIES(regno) \
+  (0 <= (regno) && (regno) <= 17)
+#define GETFPREGS_SUPPLIES(regno) \
+  (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
+
+#define PTRACE_XFER_TYPE unsigned long
+
+
+/* Transfering the general-purpose registers between GDB, inferiors
+   and core files.  */
+
+/* Fill GDB's register array with the general-purpose register values
+   in *GREGSETP.  */
+
+void
+supply_gregset (elf_gregset_t * gregsetp)
+{
+  elf_greg_t *regp = (elf_greg_t *) gregsetp;
+  int i;
+
+  for (i = 0; i < X86_64_NUM_GREGS; i++)
+    supply_register (i, (char *) (regp + x86_64_regmap[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 (elf_gregset_t * gregsetp, int regno)
+{
+  elf_greg_t *regp = (elf_greg_t *) gregsetp;
+  int i;
+
+  for (i = 0; i < X86_64_NUM_GREGS; i++)
+    if ((regno == -1 || regno == i))
+      *(regp + x86_64_regmap[i]) =
+	*(elf_greg_t *) & registers[REGISTER_BYTE (i)];
+}
+
+/* Fetch all general-purpose registers from process/thread TID and
+   store their values in GDB's register array.  */
+
+static void
+fetch_regs (int tid)
+{
+  elf_gregset_t regs;
+
+  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
+      perror_with_name ("Couldn't get registers");
+
+  supply_gregset (&regs);
+}
+
+/* Store all valid general-purpose registers in GDB's register array
+   into the process/thread specified by TID.  */
+
+static void
+store_regs (int tid, int regno)
+{
+  elf_gregset_t regs;
+
+  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
+    perror_with_name ("Couldn't get registers");
+
+  fill_gregset (&regs, regno);
+
+  if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
+    perror_with_name ("Couldn't write registers");
+}
+
+
+/* Transfering floating-point registers between GDB, inferiors and cores.  */
+
+/* Fill GDB's register array with the floating-point register values in
+   *FPREGSETP.  */
+
+void
+supply_fpregset (elf_fpregset_t * fpregsetp)
+{
+  i387_supply_fxsave ((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 (elf_fpregset_t * fpregsetp, int regno)
+{
+  i387_fill_fxsave ((char *) fpregsetp, regno);
+}
+
+/* Fetch all floating-point registers from process/thread TID and store
+   thier values in GDB's register array.  */
+
+static void
+fetch_fpregs (int tid)
+{
+  elf_fpregset_t fpregs;
+
+  if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+    perror_with_name ("Couldn't get floating point status");
+
+  supply_fpregset (&fpregs);
+}
+
+/* Store all valid floating-point registers in GDB's register array
+   into the process/thread specified by TID.  */
+
+static void
+store_fpregs (int tid, int regno)
+{
+  elf_fpregset_t fpregs;
+
+  if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+    perror_with_name ("Couldn't get floating point status");
+
+  fill_fpregset (&fpregs, regno);
+
+  if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
+    perror_with_name ("Couldn't write floating point status");
+}
+
+
+/* Transferring arbitrary registers between GDB and inferior.  */
+
+/* Fetch register REGNO from the child process.  If REGNO is -1, do
+   this for all registers (including the floating point and SSE
+   registers).  */
+
+void
+fetch_inferior_registers (int regno)
+{
+  int tid;
+
+  /* Linux LWP ID's are process ID's.  */
+  if ((tid = TIDGET (inferior_ptid)) == 0)
+    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
+
+  if (regno == -1)
+    {
+      fetch_regs (tid);
+      fetch_fpregs (tid);
+      return;
+    }
+
+  if (GETREGS_SUPPLIES (regno))
+    {
+      fetch_regs (tid);
+      return;
+    }
+
+  if (GETFPREGS_SUPPLIES (regno))
+    {
+      fetch_fpregs (tid);
+      return;
+    }
+
+  internal_error (__FILE__, __LINE__,
+		  "Got request for bad register number %d.", regno);
+}
+
+/* Store register REGNO back into the child process.  If REGNO is -1,
+   do this for all registers (including the floating point and SSE
+   registers).  */
+void
+store_inferior_registers (int regno)
+{
+  int tid;
+
+  /* Linux LWP ID's are process ID's.  */
+  if ((tid = TIDGET (inferior_ptid)) == 0)
+    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
+
+  if (regno == -1)
+    {
+      store_regs (tid, regno);
+      store_fpregs (tid, regno);
+      return;
+    }
+
+  if (GETREGS_SUPPLIES (regno))
+    {
+      store_regs (tid, regno);
+      return;
+    }
+
+  if (GETFPREGS_SUPPLIES (regno))
+    {
+      store_fpregs (tid, regno);
+      return;
+    }
+
+  internal_error (__FILE__, __LINE__,
+		  "Got request to store bad register number %d.", regno);
+}
+
+
+static const unsigned char linux_syscall[] = { 0x0f, 0x05 };
+
+#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
+
+/* The system call number is stored in the %rax register.  */
+#define LINUX_SYSCALL_REGNUM 0	/* %rax */
+
+/* We are specifically interested in the sigreturn and rt_sigreturn
+   system calls.  */
+
+#ifndef SYS_sigreturn
+#define SYS_sigreturn		__NR_sigreturn
+#endif
+#ifndef SYS_rt_sigreturn
+#define SYS_rt_sigreturn	__NR_rt_sigreturn
+#endif
+
+/* Offset to saved processor flags, from <asm/sigcontext.h>.  */
+#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (152)
+/* Offset to saved processor registers from <asm/ucontext.h> */
+#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+child_resume (ptid_t ptid, int step, enum target_signal signal)
+{
+  int pid = PIDGET (ptid);
+  int request = PTRACE_CONT;
+
+  if (pid == -1)
+    /* Resume all threads.  */
+    /* I think this only gets used in the non-threaded case, where "resume
+       all threads" and "resume inferior_ptid" are the same.  */
+    pid = PIDGET (inferior_ptid);
+
+  if (step)
+    {
+      CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid));
+      unsigned char buf[LINUX_SYSCALL_LEN];
+
+      request = PTRACE_SINGLESTEP;
+
+      /* Returning from a signal trampoline is done by calling a
+         special system call (sigreturn or rt_sigreturn, see
+         i386-linux-tdep.c for more information).  This system call
+         restores the registers that were saved when the signal was
+         raised, including %eflags.  That means that single-stepping
+         won't work.  Instead, we'll have to modify the signal context
+         that's about to be restored, and set the trace flag there.  */
+
+      /* First check if PC is at a system call.  */
+      if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0
+	  && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
+	{
+	  int syscall =
+	    read_register_pid (LINUX_SYSCALL_REGNUM, pid_to_ptid (pid));
+
+	  /* Then check the system call number.  */
+	  if (syscall == SYS_rt_sigreturn)
+	    {
+	      CORE_ADDR sp = read_register (SP_REGNUM);
+	      CORE_ADDR addr = sp;
+	      unsigned long int eflags;
+
+	      addr +=
+		sizeof (struct siginfo) + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
+
+	      /* Set the trace flag in the context that's about to be
+	         restored.  */
+	      addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
+	      read_memory (addr, (char *) &eflags, 8);
+	      eflags |= 0x0100;
+	      write_memory (addr, (char *) &eflags, 8);
+	    }
+	}
+    }
+
+  if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
+    perror_with_name ("ptrace");
+}
+
+
+/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.   Copy to inferior if
+   WRITE is nonzero.  TARGET is ignored.
+
+   Returns the length copied, which is either the LEN argument or zero.
+   This xfer function does not do partial moves, since child_ops
+   doesn't allow memory operations to cross below us in the target stack
+   anyway.  */
+
+int
+child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+		   struct mem_attrib *attrib ATTRIBUTE_UNUSED,
+		   struct target_ops *target)
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+    = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+    / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer
+    = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+  if (write)
+    {
+      /* Fill start and end extra bytes of buffer with existing memory data.  */
+      if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
+	{
+	  /* Need part of initial word -- fetch it.  */
+	  ptrace (PT_READ_I, PIDGET (inferior_ptid),
+		  (PTRACE_ARG3_TYPE) addr, buffer);
+	}
+
+      if (count > 1)		/* FIXME, avoid if even boundary */
+	{
+	  ptrace (PT_READ_I, PIDGET (inferior_ptid),
+		  ((PTRACE_ARG3_TYPE)
+		   (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
+		  buffer + count - 1);
+	}
+
+      /* Copy data to be written over corresponding part of buffer */
+
+      memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+	      myaddr, len);
+
+      /* Write the entire buffer.  */
+
+      for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+	{
+	  errno = 0;
+	  ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
+		  (PTRACE_ARG3_TYPE) addr, buffer[i]);
+	  if (errno)
+	    {
+	      /* Using the appropriate one (I or D) is necessary for
+	         Gould NP1, at least.  */
+	      errno = 0;
+	      ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
+		      (PTRACE_ARG3_TYPE) addr, buffer[i]);
+	    }
+	  if (errno)
+	    return 0;
+	}
+#ifdef CLEAR_INSN_CACHE
+      CLEAR_INSN_CACHE ();
+#endif
+    }
+  else
+    {
+      /* Read all the longwords */
+      for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+	{
+	  errno = 0;
+	  ptrace (PT_READ_I, PIDGET (inferior_ptid),
+		  (PTRACE_ARG3_TYPE) addr, buffer + i);
+	  if (errno)
+	    return 0;
+	}
+
+      /* Copy appropriate bytes out of the buffer.  */
+      memcpy (myaddr,
+	      (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+	      len);
+    }
+  return len;
+}
+
+/* Interpreting register set info found in core files.  */
+
+/* Provide registers to GDB from a core file.
+
+   CORE_REG_SECT points to an array of bytes, which are the contents
+   of a `note' from a core file which BFD thinks might contain
+   register contents.  CORE_REG_SIZE is its size.
+
+   WHICH says which register set corelow suspects this is:
+     0 --- the general-purpose register set, in elf_gregset_t format
+     2 --- the floating-point register set, in elf_fpregset_t format
+
+   REG_ADDR isn't used on Linux.  */
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+		      int which, CORE_ADDR reg_addr)
+{
+  elf_gregset_t gregset;
+  elf_fpregset_t fpregset;
+  switch (which)
+    {
+    case 0:
+      if (core_reg_size != sizeof (gregset))
+	warning ("Wrong size gregset in core file.");
+      else
+	{
+	  memcpy (&gregset, core_reg_sect, sizeof (gregset));
+	  supply_gregset (&gregset);
+	}
+      break;
+
+    case 2:
+      if (core_reg_size != sizeof (fpregset))
+	warning ("Wrong size fpregset in core file.");
+      else
+	{
+	  memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
+	  supply_fpregset (&fpregset);
+	}
+      break;
+
+    default:
+      /* We've covered all the kinds of registers we know about here,
+         so this must be something we wouldn't know what to do with
+         anyway.  Just ignore it.  */
+      break;
+    }
+}
+
+/* Register that we are able to handle Linux ELF core file formats.  */
+
+static struct core_fns linux_elf_core_fns = {
+  bfd_target_elf_flavour,	/* core_flavour */
+  default_check_format,		/* check_format */
+  default_core_sniffer,		/* core_sniffer */
+  fetch_core_registers,		/* core_read_registers */
+  NULL				/* next */
+};
+
+
+#if !defined (offsetof)
+#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+#endif
+
+/* Record the value of the debug control register.  */
+static long debug_control_mirror;
+
+/* Record which address associates with which register.  */
+static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
+
+void
+_initialize_x86_64_linux_nat (void)
+{
+  add_core_fns (&linux_elf_core_fns);
+}
diff --git a/gdb/x86-64-linux-tdep.c b/gdb/x86-64-linux-tdep.c
new file mode 100644
index 0000000..7a1a045
--- /dev/null
+++ b/gdb/x86-64-linux-tdep.c
@@ -0,0 +1,136 @@
+/* Target-dependent code for Linux running on x86-64, for GDB.
+   Copyright 2001
+   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 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 "gdbcore.h"
+#include "regcache.h"
+#include "x86-64-tdep.h"
+#include "dwarf2cfi.h"
+
+#define STRUCT_OFFSET(struct_type, member)    \
+    ((long) ((char*) &((struct_type*) 0)->member))
+
+#define LINUX_SIGTRAMP_INSN0 (0x48)	/* mov $NNNNNNNN,%rax */
+#define LINUX_SIGTRAMP_OFFSET0 (0)
+#define LINUX_SIGTRAMP_INSN1 (0x0f)	/* syscall */
+#define LINUX_SIGTRAMP_OFFSET1 (7)
+
+static const unsigned char linux_sigtramp_code[] = {
+  LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x89, 0x00, 0x00, 0x00,	/*  mov $0x89,%rax */
+  LINUX_SIGTRAMP_INSN1, 0x05	/* syscall */
+};
+
+#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
+
+/* If PC is in a sigtramp routine, return the address of the start of
+   the routine.  Otherwise, return 0.  */
+
+static CORE_ADDR
+x86_64_linux_sigtramp_start (CORE_ADDR pc)
+{
+  unsigned char buf[LINUX_SIGTRAMP_LEN];
+  if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
+    return 0;
+
+  if (buf[0] != LINUX_SIGTRAMP_INSN0)
+    {
+      if (buf[0] != LINUX_SIGTRAMP_INSN1)
+	return 0;
+
+      pc -= LINUX_SIGTRAMP_OFFSET1;
+
+      if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
+	return 0;
+    }
+
+  if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
+    return 0;
+
+  return pc;
+}
+
+/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>.  */
+#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
+
+/* Assuming FRAME is for a Linux sigtramp routine, return the address
+   of the associated sigcontext structure.  */
+CORE_ADDR
+x86_64_linux_sigcontext_addr (struct frame_info *frame)
+{
+  CORE_ADDR pc;
+
+  pc = x86_64_linux_sigtramp_start (frame->pc);
+  if (pc)
+    {
+      if (frame->next)
+	/* If this isn't the top frame, the next frame must be for the
+	   signal handler itself.  The sigcontext structure is part of
+	   the user context. */
+	return frame->next->frame + sizeof (struct siginfo) +
+	  LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
+
+
+      /* This is the top frame. */
+      return read_register (SP_REGNUM) + sizeof (struct siginfo) +
+	LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
+
+    }
+
+  error ("Couldn't recognize signal trampoline.");
+  return 0;
+}
+
+/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>.  */
+#define LINUX_SIGCONTEXT_PC_OFFSET (136)
+
+/* Assuming FRAME is for a Linux sigtramp routine, return the saved
+   program counter.  */
+
+CORE_ADDR
+x86_64_linux_sigtramp_saved_pc (struct frame_info *frame)
+{
+  CORE_ADDR addr;
+
+  addr = x86_64_linux_sigcontext_addr (frame);
+  return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 8);
+}
+
+/* Immediately after a function call, return the saved pc.  */
+
+CORE_ADDR
+x86_64_linux_saved_pc_after_call (struct frame_info *frame)
+{
+  if (frame->signal_handler_caller)
+    return x86_64_linux_sigtramp_saved_pc (frame);
+
+  return read_memory_integer (read_register (SP_REGNUM), 8);
+}
+
+/* Saved Pc.  Get it from sigcontext if within sigtramp.  */
+CORE_ADDR
+x86_64_linux_frame_saved_pc (struct frame_info *frame)
+{
+  if (frame->signal_handler_caller)
+    return x86_64_linux_sigtramp_saved_pc (frame);
+  return cfi_get_ra (frame);
+}
diff --git a/gdb/x86-64-tdep.c b/gdb/x86-64-tdep.c
new file mode 100644
index 0000000..d51e0e9
--- /dev/null
+++ b/gdb/x86-64-tdep.c
@@ -0,0 +1,1010 @@
+/* Target-dependent code for the x86-64 for GDB, the GNU debugger.
+   Copyright 2001
+   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 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 "gdbcore.h"
+#include "gdbcmd.h"
+#include "arch-utils.h"
+#include "regcache.h"
+#include "symfile.h"
+#include "x86-64-tdep.h"
+#include "dwarf2cfi.h"
+
+
+/* Register numbers of various important registers.  */
+#define RAX_REGNUM 0
+#define RDX_REGNUM 1
+#define RDI_REGNUM 5
+#define EFLAGS_REGNUM 17
+#define XMM1_REGNUM  35
+
+/* x86_64_register_raw_size_table[i] is the number of bytes of storage in
+   GDB's register array occupied by register i.  */
+int x86_64_register_raw_size_table[X86_64_NUM_REGS] = {
+  8, 8, 8, 8,
+  8, 8, 8, 8,
+  8, 8, 8, 8,
+  8, 8, 8, 8,
+  8, 4,
+  10, 10, 10, 10,
+  10, 10, 10, 10,
+  4, 4, 4, 4,
+  4, 4, 4, 4,
+  16, 16, 16, 16,
+  16, 16, 16, 16,
+  16, 16, 16, 16,
+  16, 16, 16, 16,
+  4
+};
+
+/* Number of bytes of storage in the actual machine representation for
+   register REGNO.  */
+int
+x86_64_register_raw_size (int regno)
+{
+  return x86_64_register_raw_size_table[regno];
+}
+
+/* x86_64_register_byte_table[i] is the offset into the register file of the
+   start of register number i.  We initialize this from
+   x86_64_register_raw_size_table.  */
+int x86_64_register_byte_table[X86_64_NUM_REGS];
+
+/* Index within `registers' of the first byte of the space for register REGNO.  */
+int
+x86_64_register_byte (int regno)
+{
+  return x86_64_register_byte_table[regno];
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+   register N. */
+static struct type *
+x86_64_register_virtual_type (int regno)
+{
+  if (regno == PC_REGNUM || regno == SP_REGNUM)
+    return lookup_pointer_type (builtin_type_void);
+  if (IS_FP_REGNUM (regno))
+    return builtin_type_long_double;
+  if (IS_SSE_REGNUM (regno))
+    return builtin_type_v4sf;
+  if (IS_FPU_CTRL_REGNUM (regno) || regno == MXCSR_REGNUM
+      || regno == EFLAGS_REGNUM)
+    return builtin_type_int;
+  return builtin_type_long;
+}
+
+/* Number of bytes of storage in the program's representation
+   for register REGNO.  */
+int
+x86_64_register_virtual_size (int regno)
+{
+  return (TYPE_LENGTH (x86_64_register_virtual_type (regno)));
+}
+
+/* x86_64_register_convertible is true if register N's virtual format is
+   different from its raw format.  Note that this definition assumes
+   that the host supports IEEE 32-bit floats, since it doesn't say
+   that SSE registers need conversion.  Even if we can't find a
+   counterexample, this is still sloppy.  */
+int
+x86_64_register_convertible (int regno)
+{
+  return IS_FP_REGNUM (regno);
+}
+
+/* Convert data from raw format for register REGNUM in buffer FROM to
+   virtual format with type TYPE in buffer TO.  In principle both
+   formats are identical except that the virtual format has two extra
+   bytes appended that aren't used.  We set these to zero.  */
+void
+x86_64_register_convert_to_virtual (int regnum, struct type *type,
+				    char *from, char *to)
+{
+/* Copy straight over, but take care of the padding.  */
+  memcpy (to, from, FPU_REG_RAW_SIZE);
+  memset (to + FPU_REG_RAW_SIZE, 0, TYPE_LENGTH (type) - FPU_REG_RAW_SIZE);
+}
+
+/* Convert data from virtual format with type TYPE in buffer FROM to
+   raw format for register REGNUM in buffer TO.  Simply omit the two
+   unused bytes.  */
+
+void
+x86_64_register_convert_to_raw (struct type *type, int regnum,
+				char *from, char *to)
+{
+  memcpy (to, from, FPU_REG_RAW_SIZE);
+}
+
+
+/* This is the variable that is set with "set disassembly-flavour", and
+   its legitimate values.  */
+static const char att_flavour[] = "att";
+static const char intel_flavour[] = "intel";
+static const char *valid_flavours[] = {
+  att_flavour,
+  intel_flavour,
+  NULL
+};
+static const char *disassembly_flavour = att_flavour;
+
+static CORE_ADDR
+x86_64_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+  char buf[8];
+
+  store_unsigned_integer (buf, 8, CALL_DUMMY_ADDRESS ());
+
+  write_memory (sp - 8, buf, 8);
+  return sp - 8;
+}
+
+void
+x86_64_pop_frame (void)
+{
+  generic_pop_current_frame (cfi_pop_frame);
+}
+
+
+/* The returning of values is done according to the special algorithm.
+   Some types are returned in registers an some (big structures) in memory.
+   See ABI for details.
+ */
+
+#define MAX_CLASSES 4
+
+enum x86_64_reg_class
+{
+  X86_64_NO_CLASS,
+  X86_64_INTEGER_CLASS,
+  X86_64_INTEGERSI_CLASS,
+  X86_64_SSE_CLASS,
+  X86_64_SSESF_CLASS,
+  X86_64_SSEDF_CLASS,
+  X86_64_SSEUP_CLASS,
+  X86_64_X87_CLASS,
+  X86_64_X87UP_CLASS,
+  X86_64_MEMORY_CLASS
+};
+
+/* Return the union class of CLASS1 and CLASS2.
+   See the x86-64 ABI for details.  */
+
+static enum x86_64_reg_class
+merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2)
+{
+  /* Rule #1: If both classes are equal, this is the resulting class.  */
+  if (class1 == class2)
+    return class1;
+
+  /* Rule #2: If one of the classes is NO_CLASS, the resulting class is
+     the other class.  */
+  if (class1 == X86_64_NO_CLASS)
+    return class2;
+  if (class2 == X86_64_NO_CLASS)
+    return class1;
+
+  /* Rule #3: If one of the classes is MEMORY, the result is MEMORY.  */
+  if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS)
+    return X86_64_MEMORY_CLASS;
+
+  /* Rule #4: If one of the classes is INTEGER, the result is INTEGER.  */
+  if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS)
+      || (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS))
+    return X86_64_INTEGERSI_CLASS;
+  if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS
+      || class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS)
+    return X86_64_INTEGER_CLASS;
+
+  /* Rule #5: If one of the classes is X87 or X87UP class, MEMORY is used.  */
+  if (class1 == X86_64_X87_CLASS || class1 == X86_64_X87UP_CLASS
+      || class2 == X86_64_X87_CLASS || class2 == X86_64_X87UP_CLASS)
+    return X86_64_MEMORY_CLASS;
+
+  /* Rule #6: Otherwise class SSE is used.  */
+  return X86_64_SSE_CLASS;
+}
+
+
+/* Classify the argument type.
+   CLASSES will be filled by the register class used to pass each word
+   of the operand.  The number of words is returned.  In case the parameter
+   should be passed in memory, 0 is returned. As a special case for zero
+   sized containers, classes[0] will be NO_CLASS and 1 is returned.
+
+   See the x86-64 PS ABI for details.
+*/
+
+static int
+classify_argument (struct type *type,
+		   enum x86_64_reg_class classes[MAX_CLASSES], int bit_offset)
+{
+  int bytes = TYPE_LENGTH (type);
+  int words = (bytes + 8 - 1) / 8;
+
+  switch (TYPE_CODE (type))
+    {
+    case TYPE_CODE_ARRAY:
+    case TYPE_CODE_STRUCT:
+    case TYPE_CODE_UNION:
+      {
+	int i;
+	enum x86_64_reg_class subclasses[MAX_CLASSES];
+
+	/* On x86-64 we pass structures larger than 16 bytes on the stack.  */
+	if (bytes > 16)
+	  return 0;
+
+	for (i = 0; i < words; i++)
+	  classes[i] = X86_64_NO_CLASS;
+
+	/* Zero sized arrays or structures are NO_CLASS.  We return 0 to
+	   signalize memory class, so handle it as special case.  */
+	if (!words)
+	  {
+	    classes[0] = X86_64_NO_CLASS;
+	    return 1;
+	  }
+	switch (TYPE_CODE (type))
+	  {
+	  case TYPE_CODE_STRUCT:
+	    {
+	      int j;
+	      for (j = 0; j < type->nfields; ++j)
+		{
+		  int num = classify_argument (type->fields[j].type,
+					       subclasses,
+					       (type->fields[j].loc.bitpos
+						+ bit_offset) % 256);
+		  if (!num)
+		    return 0;
+		  for (i = 0; i < num; i++)
+		    {
+		      int pos =
+			(type->fields[j].loc.bitpos + bit_offset) / 8 / 8;
+		      classes[i + pos] =
+			merge_classes (subclasses[i], classes[i + pos]);
+		    }
+		}
+	    }
+	    break;
+	  case TYPE_CODE_ARRAY:
+	    {
+	      int num;
+
+	      num = classify_argument (type->target_type,
+				       subclasses, bit_offset);
+	      if (!num)
+		return 0;
+
+	      /* The partial classes are now full classes.  */
+	      if (subclasses[0] == X86_64_SSESF_CLASS && bytes != 4)
+		subclasses[0] = X86_64_SSE_CLASS;
+	      if (subclasses[0] == X86_64_INTEGERSI_CLASS && bytes != 4)
+		subclasses[0] = X86_64_INTEGER_CLASS;
+
+	      for (i = 0; i < words; i++)
+		classes[i] = subclasses[i % num];
+	    }
+	    break;
+	  case TYPE_CODE_UNION:
+	    {
+	      int j;
+	      {
+		for (j = 0; j < type->nfields; ++j)
+		  {
+		    int num;
+		    num = classify_argument (type->fields[j].type,
+					     subclasses, bit_offset);
+		    if (!num)
+		      return 0;
+		    for (i = 0; i < num; i++)
+		      classes[i] = merge_classes (subclasses[i], classes[i]);
+		  }
+	      }
+	    }
+	    break;
+	  }
+	/* Final merger cleanup.  */
+	for (i = 0; i < words; i++)
+	  {
+	    /* If one class is MEMORY, everything should be passed in
+	       memory.  */
+	    if (classes[i] == X86_64_MEMORY_CLASS)
+	      return 0;
+
+	    /* The X86_64_SSEUP_CLASS should be always preceeded by
+	       X86_64_SSE_CLASS.  */
+	    if (classes[i] == X86_64_SSEUP_CLASS
+		&& (i == 0 || classes[i - 1] != X86_64_SSE_CLASS))
+	      classes[i] = X86_64_SSE_CLASS;
+
+	    /*  X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS.  */
+	    if (classes[i] == X86_64_X87UP_CLASS
+		&& (i == 0 || classes[i - 1] != X86_64_X87_CLASS))
+	      classes[i] = X86_64_SSE_CLASS;
+	  }
+	return words;
+      }
+      break;
+    case TYPE_CODE_FLT:
+      switch (bytes)
+	{
+	case 4:
+	  if (!(bit_offset % 64))
+	    classes[0] = X86_64_SSESF_CLASS;
+	  else
+	    classes[0] = X86_64_SSE_CLASS;
+	  return 1;
+	case 8:
+	  classes[0] = X86_64_SSEDF_CLASS;
+	  return 1;
+	case 16:
+	  classes[0] = X86_64_X87_CLASS;
+	  classes[1] = X86_64_X87UP_CLASS;
+	  return 2;
+	}
+      break;
+    case TYPE_CODE_INT:
+    case TYPE_CODE_PTR:
+      switch (bytes)
+	{
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+	  if (bytes * 8 + bit_offset <= 32)
+	    classes[0] = X86_64_INTEGERSI_CLASS;
+	  else
+	    classes[0] = X86_64_INTEGER_CLASS;
+	  return 1;
+	case 16:
+	  classes[0] = classes[1] = X86_64_INTEGER_CLASS;
+	  return 2;
+	default:
+	  break;
+	}
+    case TYPE_CODE_VOID:
+      return 0;
+    }
+  internal_error (__FILE__, __LINE__, "classify_argument: unknown argument type");
+}
+
+/* Examine the argument and return set number of register required in each
+   class.  Return 0 ifif parameter should be passed in memory.  */
+
+static int
+examine_argument (enum x86_64_reg_class classes[MAX_CLASSES],
+		  int n, int *int_nregs, int *sse_nregs)
+{
+  *int_nregs = 0;
+  *sse_nregs = 0;
+  if (!n)
+    return 0;
+  for (n--; n >= 0; n--)
+    switch (classes[n])
+      {
+      case X86_64_INTEGER_CLASS:
+      case X86_64_INTEGERSI_CLASS:
+	(*int_nregs)++;
+	break;
+      case X86_64_SSE_CLASS:
+      case X86_64_SSESF_CLASS:
+      case X86_64_SSEDF_CLASS:
+	(*sse_nregs)++;
+	break;
+      case X86_64_NO_CLASS:
+      case X86_64_SSEUP_CLASS:
+      case X86_64_X87_CLASS:
+      case X86_64_X87UP_CLASS:
+	break;
+      case X86_64_MEMORY_CLASS:
+	internal_error (__FILE__, __LINE__, "examine_argument: unexpected memory class");
+      }
+  return 1;
+}
+
+#define RET_INT_REGS 2
+#define RET_SSE_REGS 2
+
+/* Check if the structure in value_type is returned in registers or in
+   memory. If this function returns 1, gdb will call STORE_STRUCT_RETURN and
+   EXTRACT_STRUCT_VALUE_ADDRESS else STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE
+   will be used.  */
+int
+x86_64_use_struct_convention (int gcc_p, struct type *value_type)
+{
+  enum x86_64_reg_class class[MAX_CLASSES];
+  int n = classify_argument (value_type, class, 0);
+  int needed_intregs;
+  int needed_sseregs;
+
+  return (!n ||
+	  !examine_argument (class, n, &needed_intregs, &needed_sseregs) ||
+	  needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS);
+}
+
+
+/* Extract from an array REGBUF containing the (raw) register state, a
+   function return value of TYPE, and copy that, in virtual format,
+   into VALBUF.  */
+
+void
+x86_64_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+{
+  enum x86_64_reg_class class[MAX_CLASSES];
+  int n = classify_argument (type, class, 0);
+  int needed_intregs;
+  int needed_sseregs;
+  int intreg = 0;
+  int ssereg = 0;
+  int offset = 0;
+  int ret_int_r[RET_INT_REGS] = { RAX_REGNUM, RDX_REGNUM };
+  int ret_sse_r[RET_SSE_REGS] = { XMM0_REGNUM, XMM1_REGNUM };
+
+  if (!n ||
+      !examine_argument (class, n, &needed_intregs, &needed_sseregs) ||
+      needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS)
+    {				/* memory class */
+      CORE_ADDR addr;
+      memcpy (&addr, regbuf, REGISTER_RAW_SIZE (RAX_REGNUM));
+      read_memory (addr, valbuf, TYPE_LENGTH (type));
+      return;
+    }
+  else
+    {
+      int i;
+      for (i = 0; i < n; i++)
+	{
+	  switch (class[i])
+	    {
+	    case X86_64_NO_CLASS:
+	      break;
+	    case X86_64_INTEGER_CLASS:
+	      memcpy (valbuf + offset,
+		      regbuf + REGISTER_BYTE (ret_int_r[(intreg + 1) / 2]),
+		      8);
+	      offset += 8;
+	      intreg += 2;
+	      break;
+	    case X86_64_INTEGERSI_CLASS:
+	      memcpy (valbuf + offset,
+		      regbuf + REGISTER_BYTE (ret_int_r[intreg / 2]), 4);
+	      offset += 8;
+	      intreg++;
+	      break;
+	    case X86_64_SSEDF_CLASS:
+	    case X86_64_SSESF_CLASS:
+	    case X86_64_SSE_CLASS:
+	      memcpy (valbuf + offset,
+		      regbuf + REGISTER_BYTE (ret_sse_r[(ssereg + 1) / 2]),
+		      8);
+	      offset += 8;
+	      ssereg += 2;
+	      break;
+	    case X86_64_SSEUP_CLASS:
+	      memcpy (valbuf + offset + 8,
+		      regbuf + REGISTER_BYTE (ret_sse_r[ssereg / 2]), 8);
+	      offset += 8;
+	      ssereg++;
+	      break;
+	    case X86_64_X87_CLASS:
+	      memcpy (valbuf + offset, regbuf + REGISTER_BYTE (FP0_REGNUM),
+		      8);
+	      offset += 8;
+	      break;
+	    case X86_64_X87UP_CLASS:
+	      memcpy (valbuf + offset,
+		      regbuf + REGISTER_BYTE (FP0_REGNUM) + 8, 8);
+	      offset += 8;
+	      break;
+	    case X86_64_MEMORY_CLASS:
+	    default:
+	      internal_error (__FILE__, __LINE__,
+			      "Unexpected argument class");
+	    }
+	}
+    }
+}
+
+/* Handled by unwind informations.  */
+static void
+x86_64_frame_init_saved_regs (struct frame_info *fi)
+{
+}
+
+#define INT_REGS 6
+#define SSE_REGS 16
+
+/* Push onto the stack the specified value VALUE.  Pad it correctly for
+   it to be an argument to a function.  */
+
+static CORE_ADDR
+value_push (register CORE_ADDR sp, value_ptr arg)
+{
+  register int len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg));
+  register int container_len = len;
+
+  /* How big is the container we're going to put this value in?  */
+  if (PARM_BOUNDARY)
+    container_len = ((len + PARM_BOUNDARY / TARGET_CHAR_BIT - 1)
+		     & ~(PARM_BOUNDARY / TARGET_CHAR_BIT - 1));
+
+  sp -= container_len;
+  write_memory (sp, VALUE_CONTENTS_ALL (arg), len);
+
+  return sp;
+}
+
+CORE_ADDR
+x86_64_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp,
+		       int struct_return, CORE_ADDR struct_addr)
+{
+  int intreg = 0;
+  int ssereg = 0;
+  int i;
+  static int int_parameter_registers[INT_REGS] = {5 /*RDI*/, 4 /*RSI*/,
+						  1 /*RDX*/, 2 /*RCX*/,
+						  8 /*R8 */, 9 /*R9 */};
+  /* XMM0 - XMM15  */
+  static int sse_parameter_registers[SSE_REGS] = {34, 35, 36, 37,
+						  38, 39, 40, 41,
+						  42, 43, 44, 45,
+						  46, 47, 48, 49};
+  for (i = 0; i < nargs; i++)
+    {
+      enum x86_64_reg_class class[MAX_CLASSES];
+      int n = classify_argument (args[i]->type, class, 0);
+      int needed_intregs;
+      int needed_sseregs;
+
+      if (!n ||
+	  !examine_argument (class, n, &needed_intregs, &needed_sseregs)
+	  || intreg + needed_intregs > INT_REGS
+	  || ssereg + needed_sseregs > SSE_REGS)
+	{				/* memory class */
+	  sp = value_push (sp, args[i]);
+	}
+      else
+	{
+	  int j;
+	  for (j = 0; j < n; j++)
+	    {
+	      int offset = 0;
+	      switch (class[j])
+		{
+		case X86_64_NO_CLASS:
+		  break;
+		case X86_64_INTEGER_CLASS:
+		  write_register_gen (int_parameter_registers[(intreg + 1) / 2],
+				      VALUE_CONTENTS_ALL (args[i]) + offset);
+		  offset += 8;
+		  intreg += 2;
+		  break;
+		case X86_64_INTEGERSI_CLASS:
+		  write_register_gen (int_parameter_registers[intreg / 2],
+				      VALUE_CONTENTS_ALL (args[i]) + offset);
+		  offset += 8;
+		  intreg++;
+		  break;
+		case X86_64_SSEDF_CLASS:
+		case X86_64_SSESF_CLASS:
+		case X86_64_SSE_CLASS:
+		  write_register_gen (sse_parameter_registers[(ssereg + 1) / 2],
+				      VALUE_CONTENTS_ALL (args[i]) + offset);
+		  offset += 8;
+		  ssereg += 2;
+		  break;
+		case X86_64_SSEUP_CLASS:
+		  write_register_gen (sse_parameter_registers[ssereg / 2],
+				      VALUE_CONTENTS_ALL (args[i]) + offset);
+		  offset += 8;
+		  ssereg++;
+		  break;
+		case X86_64_X87_CLASS:
+		case X86_64_X87UP_CLASS:
+		case X86_64_MEMORY_CLASS:
+		  sp = value_push (sp, args[i]);
+		  break;
+		default:
+		  internal_error (__FILE__, __LINE__,
+				  "Unexpected argument class");
+		}
+	      intreg += intreg % 2;
+	      ssereg += ssereg % 2;
+	    }
+	}
+    }
+  return sp;
+}
+
+/* Write into the appropriate registers a function return value stored
+   in VALBUF of type TYPE, given in virtual format.  */
+void
+x86_64_store_return_value (struct type *type, char *valbuf)
+{
+  int len = TYPE_LENGTH (type);
+
+  if (TYPE_CODE_FLT == TYPE_CODE (type))
+    {
+      /* Floating-point return values can be found in %st(0).  */
+      if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
+	  && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
+	{
+	  /* Copy straight over.  */
+	  write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf,
+				FPU_REG_RAW_SIZE);
+	}
+      else
+	{
+	  char buf[FPU_REG_RAW_SIZE];
+	  DOUBLEST val;
+
+	  /* Convert the value found in VALBUF to the extended
+	     floating point format used by the FPU.  This is probably
+	     not exactly how it would happen on the target itself, but
+	     it is the best we can do.  */
+	  val = extract_floating (valbuf, TYPE_LENGTH (type));
+	  floatformat_from_doublest (&floatformat_i387_ext, &val, buf);
+	  write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf,
+				FPU_REG_RAW_SIZE);
+	}
+    }
+  else
+    {
+      int low_size = REGISTER_RAW_SIZE (0);
+      int high_size = REGISTER_RAW_SIZE (1);
+
+      if (len <= low_size)
+	write_register_bytes (REGISTER_BYTE (0), valbuf, len);
+      else if (len <= (low_size + high_size))
+	{
+	  write_register_bytes (REGISTER_BYTE (0), valbuf, low_size);
+	  write_register_bytes (REGISTER_BYTE (1),
+				valbuf + low_size, len - low_size);
+	}
+      else
+	internal_error (__FILE__, __LINE__,
+			"Cannot store return value of %d bytes long.", len);
+    }
+}
+
+
+static char *
+x86_64_register_name (int reg_nr)
+{
+  static char *register_names[] = {
+    "rax", "rdx", "rcx", "rbx",
+    "rsi", "rdi", "rbp", "rsp",
+    "r8", "r9", "r10", "r11",
+    "r12", "r13", "r14", "r15",
+    "rip", "eflags",
+    "st0", "st1", "st2", "st3",
+    "st4", "st5", "st6", "st7",
+    "fctrl", "fstat", "ftag", "fiseg",
+    "fioff", "foseg", "fooff", "fop",
+    "xmm0", "xmm1", "xmm2", "xmm3",
+    "xmm4", "xmm5", "xmm6", "xmm7",
+    "xmm8", "xmm9", "xmm10", "xmm11",
+    "xmm12", "xmm13", "xmm14", "xmm15",
+    "mxcsr"
+  };
+  if (reg_nr < 0)
+    return NULL;
+  if (reg_nr >= (sizeof (register_names) / sizeof (*register_names)))
+    return NULL;
+  return register_names[reg_nr];
+}
+
+
+
+/* We have two flavours of disassembly.  The machinery on this page
+   deals with switching between those.  */
+
+static int
+gdb_print_insn_x86_64 (bfd_vma memaddr, disassemble_info * info)
+{
+  if (disassembly_flavour == att_flavour)
+    return print_insn_i386_att (memaddr, info);
+  else if (disassembly_flavour == intel_flavour)
+    return print_insn_i386_intel (memaddr, info);
+  /* Never reached -- disassembly_flavour is always either att_flavour
+     or intel_flavour.  */
+  internal_error (__FILE__, __LINE__, "failed internal consistency check");
+}
+
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. */
+void
+x86_64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+  write_register (RDI_REGNUM, addr);
+}
+
+int
+x86_64_frameless_function_invocation (struct frame_info *frame)
+{
+  return 0;
+}
+
+/* On x86_64 there are no reasonable prologs.  */
+CORE_ADDR
+x86_64_skip_prologue (CORE_ADDR pc)
+{
+  return pc;
+}
+
+/* Sequence of bytes for breakpoint instruction.  */
+static unsigned char *
+x86_64_breakpoint_from_pc (CORE_ADDR *pc, int *lenptr)
+{
+  static unsigned char breakpoint[] = { 0xcc };
+  *lenptr = 1;
+  return breakpoint;
+}
+
+static struct gdbarch *
+i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+  struct gdbarch *gdbarch;
+  struct gdbarch_tdep *tdep;
+
+  /* Find a candidate among the list of pre-declared architectures. */
+  for (arches = gdbarch_list_lookup_by_info (arches, &info);
+       arches != NULL;
+       arches = gdbarch_list_lookup_by_info (arches->next, &info))
+    {
+      switch (info.bfd_arch_info->mach)
+	{
+	case bfd_mach_x86_64:
+	case bfd_mach_x86_64_intel_syntax:
+	  switch (gdbarch_bfd_arch_info (arches->gdbarch)->mach)
+	    {
+	    case bfd_mach_x86_64:
+	    case bfd_mach_x86_64_intel_syntax:
+	      return arches->gdbarch;
+	    case bfd_mach_i386_i386:
+	    case bfd_mach_i386_i8086:
+	    case bfd_mach_i386_i386_intel_syntax:
+	      break;
+	    default:
+	      internal_error (__FILE__, __LINE__,
+			      "i386_gdbarch_init: unknown machine type");
+	    }
+	  break;
+	case bfd_mach_i386_i386:
+	case bfd_mach_i386_i8086:
+	case bfd_mach_i386_i386_intel_syntax:
+	  switch (gdbarch_bfd_arch_info (arches->gdbarch)->mach)
+	    {
+	    case bfd_mach_x86_64:
+	    case bfd_mach_x86_64_intel_syntax:
+	      break;
+	    case bfd_mach_i386_i386:
+	    case bfd_mach_i386_i8086:
+	    case bfd_mach_i386_i386_intel_syntax:
+	      return arches->gdbarch;
+	    default:
+	      internal_error (__FILE__, __LINE__,
+			      "i386_gdbarch_init: unknown machine type");
+	    }
+	  break;
+	default:
+	  internal_error (__FILE__, __LINE__,
+			  "i386_gdbarch_init: unknown machine type");
+	}
+    }
+
+  tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
+  gdbarch = gdbarch_alloc (&info, tdep);
+
+  switch (info.bfd_arch_info->mach)
+    {
+    case bfd_mach_x86_64:
+    case bfd_mach_x86_64_intel_syntax:
+      tdep->last_fpu_regnum = 25;
+      tdep->first_xmm_regnum = 34;
+      tdep->last_xmm_regnum = 49;
+      tdep->mxcsr_regnum = 50;
+      tdep->first_fpu_ctrl_regnum = 26;
+      break;
+    case bfd_mach_i386_i386:
+    case bfd_mach_i386_i8086:
+    case bfd_mach_i386_i386_intel_syntax:
+      /* This is place for definition of i386 target vector.  */
+      break;
+    default:
+      internal_error (__FILE__, __LINE__,
+		      "i386_gdbarch_init: unknown machine type");
+    }
+
+  set_gdbarch_long_bit (gdbarch, 64);
+  set_gdbarch_long_long_bit (gdbarch, 64);
+  set_gdbarch_ptr_bit (gdbarch, 64);
+
+  set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext);
+  set_gdbarch_ieee_float (gdbarch, 1);
+
+
+  set_gdbarch_num_regs (gdbarch, X86_64_NUM_REGS);
+  set_gdbarch_register_name (gdbarch, x86_64_register_name);
+  set_gdbarch_register_size (gdbarch, 8);
+  set_gdbarch_register_raw_size (gdbarch, x86_64_register_raw_size);
+  set_gdbarch_max_register_raw_size (gdbarch, 16);
+  set_gdbarch_register_byte (gdbarch, x86_64_register_byte);
+  /* Total amount of space needed to store our copies of the machine's register
+     (SIZEOF_GREGS + SIZEOF_FPU_REGS + SIZEOF_FPU_CTRL_REGS + SIZEOF_SSE_REGS) */
+  set_gdbarch_register_bytes (gdbarch,
+			      (18 * 8) + (8 * 10) + (8 * 4) + (8 * 16 + 4));
+  set_gdbarch_register_virtual_size (gdbarch, x86_64_register_virtual_size);
+  set_gdbarch_max_register_virtual_size (gdbarch, 16);
+
+  set_gdbarch_register_virtual_type (gdbarch, x86_64_register_virtual_type);
+
+  set_gdbarch_register_convertible (gdbarch, x86_64_register_convertible);
+  set_gdbarch_register_convert_to_virtual (gdbarch,
+					   x86_64_register_convert_to_virtual);
+  set_gdbarch_register_convert_to_raw (gdbarch,
+				       x86_64_register_convert_to_raw);
+
+/* Register numbers of various important registers.  */
+  set_gdbarch_sp_regnum (gdbarch, 7);	/* (rsp) Contains address of top of stack.  */
+  set_gdbarch_fp_regnum (gdbarch, 6);	/* (rbp) */
+  set_gdbarch_pc_regnum (gdbarch, 16);	/* (rip) Contains program counter.  */
+
+  set_gdbarch_fp0_regnum (gdbarch, 18);	/* First FPU floating-point register.  */
+
+  set_gdbarch_read_fp (gdbarch, cfi_read_fp);
+  set_gdbarch_write_fp (gdbarch, cfi_write_fp);
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+  set_gdbarch_pop_frame (gdbarch, x86_64_pop_frame);
+
+  /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
+     chain-pointer.  */
+  set_gdbarch_frame_chain (gdbarch, cfi_frame_chain);
+
+  set_gdbarch_frameless_function_invocation (gdbarch,
+					     x86_64_frameless_function_invocation);
+  set_gdbarch_frame_saved_pc (gdbarch, x86_64_linux_frame_saved_pc);
+
+  set_gdbarch_frame_args_address (gdbarch, default_frame_address);
+  set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
+
+/* Return number of bytes at start of arglist that are not really args.  */
+  set_gdbarch_frame_args_skip (gdbarch, 8);
+
+  set_gdbarch_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs);
+
+/* Frame pc initialization is handled by unwind informations.  */
+  set_gdbarch_init_frame_pc (gdbarch, cfi_init_frame_pc);
+
+/* Initialization of unwind informations.  */
+  set_gdbarch_init_extra_frame_info (gdbarch, cfi_init_extra_frame_info);
+
+/* Getting saved registers is handled by unwind informations.  */
+  set_gdbarch_get_saved_register (gdbarch, cfi_get_saved_register);
+
+  set_gdbarch_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs);
+
+/* Cons up virtual frame pointer for trace */
+  set_gdbarch_virtual_frame_pointer (gdbarch, cfi_virtual_frame_pointer);
+
+
+  set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid);
+
+  set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
+  set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
+  set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
+  set_gdbarch_call_dummy_length (gdbarch, 0);
+  set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
+  set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+  set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point);
+  set_gdbarch_call_dummy_words (gdbarch, 0);
+  set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
+  set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+  set_gdbarch_call_dummy_p (gdbarch, 1);
+  set_gdbarch_call_dummy_start_offset (gdbarch, 0);
+  set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
+  set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
+  set_gdbarch_push_return_address (gdbarch, x86_64_push_return_address);
+  set_gdbarch_push_arguments (gdbarch, x86_64_push_arguments);
+
+/* Return number of args passed to a frame, no way to tell.  */
+  set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
+/* Don't use default structure extract routine */
+  set_gdbarch_extract_struct_value_address (gdbarch, 0);
+
+/* If USE_STRUCT_CONVENTION retruns 0, then gdb uses STORE_RETURN_VALUE
+   and EXTRACT_RETURN_VALUE to store/fetch the functions return value.  It is
+   the case when structure is returned in registers.  */
+  set_gdbarch_use_struct_convention (gdbarch, x86_64_use_struct_convention);
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. */
+  set_gdbarch_store_struct_return (gdbarch, x86_64_store_struct_return);
+
+/* Extract from an array REGBUF containing the (raw) register state
+   a function return value of type TYPE, and copy that, in virtual format,
+   into VALBUF.  */
+  set_gdbarch_extract_return_value (gdbarch, x86_64_extract_return_value);
+
+
+/* Write into the appropriate registers a function return value stored
+   in VALBUF of type TYPE, given in virtual format.  */
+  set_gdbarch_store_return_value (gdbarch, x86_64_store_return_value);
+
+
+/* Offset from address of function to start of its code.  */
+  set_gdbarch_function_start_offset (gdbarch, 0);
+
+  set_gdbarch_skip_prologue (gdbarch, x86_64_skip_prologue);
+
+  set_gdbarch_saved_pc_after_call (gdbarch, x86_64_linux_saved_pc_after_call);
+
+  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+  set_gdbarch_breakpoint_from_pc (gdbarch, x86_64_breakpoint_from_pc);
+
+
+/* Amount PC must be decremented by after a breakpoint.  This is often the
+   number of bytes in BREAKPOINT but not always.  */
+  set_gdbarch_decr_pc_after_break (gdbarch, 1);
+
+  return gdbarch;
+}
+
+void
+_initialize_x86_64_tdep (void)
+{
+  register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init);
+
+  /* Initialize the table saying where each register starts in the
+     register file.  */
+  {
+    int i, offset;
+
+    offset = 0;
+    for (i = 0; i < X86_64_NUM_REGS; i++)
+      {
+	x86_64_register_byte_table[i] = offset;
+	offset += x86_64_register_raw_size_table[i];
+      }
+  }
+
+  tm_print_insn = gdb_print_insn_x86_64;
+  tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 3)->mach;
+
+  /* Add the variable that controls the disassembly flavour.  */
+  {
+    struct cmd_list_element *new_cmd;
+
+    new_cmd = add_set_enum_cmd ("disassembly-flavour", no_class,
+				valid_flavours, &disassembly_flavour, "\
+Set the disassembly flavour, the valid values are \"att\" and \"intel\", \
+and the default value is \"att\".", &setlist);
+    add_show_from_set (new_cmd, &showlist);
+  }
+}
diff --git a/gdb/x86-64-tdep.h b/gdb/x86-64-tdep.h
new file mode 100644
index 0000000..d04da8b
--- /dev/null
+++ b/gdb/x86-64-tdep.h
@@ -0,0 +1,49 @@
+/* Target-dependent code for GDB, the GNU debugger.
+   Copyright 2001
+   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 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.  */
+
+#ifndef X86_64_TDEP_H
+#define X86_64_TDEP_H
+
+#include "i386-tdep.h"
+#include <sys/reg.h>
+
+/* Mapping between the general-purpose registers in `struct user'
+   format and GDB's register array layout.  */
+
+static int x86_64_regmap[] = {
+  RAX, RDX, RCX, RBX,
+  RSI, RDI, RBP, RSP,
+  R8, R9, R10, R11,
+  R12, R13, R14, R15,
+  RIP, EFLAGS
+};
+
+/* Number of all registers */
+#define X86_64_NUM_REGS (51)
+
+/* Number of general registers.  */
+#define X86_64_NUM_GREGS (18)
+
+gdbarch_frame_saved_pc_ftype x86_64_linux_frame_saved_pc;
+gdbarch_saved_pc_after_call_ftype x86_64_linux_saved_pc_after_call;
+
+#endif