1/* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format.
2   Copyright (C) 2001, 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
3   Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to
19the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22#define TARGET_VERSION fprintf (stderr, " (x86-64 Linux/ELF)");
23
24#define TARGET_OS_CPP_BUILTINS()				\
25  do								\
26    {								\
27	LINUX_TARGET_OS_CPP_BUILTINS();				\
28    }								\
29  while (0)
30
31#undef CPP_SPEC
32#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
33
34/* The svr4 ABI for the i386 says that records and unions are returned
35   in memory.  In the 64bit compilation we will turn this flag off in
36   override_options, as we never do pcc_struct_return scheme on this target.  */
37#undef DEFAULT_PCC_STRUCT_RETURN
38#define DEFAULT_PCC_STRUCT_RETURN 1
39
40/* We arrange for the whole %fs segment to map the tls area.  */
41#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
42#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
43
44/* Provide a LINK_SPEC.  Here we provide support for the special GCC
45   options -static and -shared, which allow us to link things in one
46   of these three modes by applying the appropriate combinations of
47   options at link-time.
48
49   When the -shared link option is used a final link is not being
50   done.  */
51
52#define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
53#define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
54
55#undef	LINK_SPEC
56#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} \
57  %{shared:-shared} \
58  %{!shared: \
59    %{!static: \
60      %{rdynamic:-export-dynamic} \
61      %{m32:%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}} \
62      %{!m32:%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}} \
63    %{static:-static}}"
64
65/* Similar to standard Linux, but adding -ffast-math support.  */
66#undef  ENDFILE_SPEC
67#define ENDFILE_SPEC \
68  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
69   %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
70
71#define MULTILIB_DEFAULTS { "m64" }
72
73#undef NEED_INDICATE_EXEC_STACK
74#define NEED_INDICATE_EXEC_STACK 1
75
76#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
77
78/* This macro may be overridden in i386/k*bsd-gnu.h.  */
79#define REG_NAME(reg) reg
80
81#ifdef TARGET_LIBC_PROVIDES_SSP
82/* i386 glibc provides __stack_chk_guard in %gs:0x14,
83   x86_64 glibc provides it in %fs:0x28.  */
84#define TARGET_THREAD_SSP_OFFSET	(TARGET_64BIT ? 0x28 : 0x14)
85#endif
86