1/* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format.
2   Copyright (C) 2001, 2002, 2004 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	if (flag_pic)						\
29	  {							\
30	    builtin_define ("__PIC__");				\
31	    builtin_define ("__pic__");				\
32	  }							\
33    }								\
34  while (0)
35
36#undef CPP_SPEC
37#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
38
39/* The svr4 ABI for the i386 says that records and unions are returned
40   in memory.  In the 64bit compilation we will turn this flag off in
41   override_options, as we never do pcc_struct_return scheme on this target.  */
42#undef DEFAULT_PCC_STRUCT_RETURN
43#define DEFAULT_PCC_STRUCT_RETURN 1
44
45/* We arrange for the whole %fs segment to map the tls area.  */
46#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
47#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
48
49/* Provide a LINK_SPEC.  Here we provide support for the special GCC
50   options -static and -shared, which allow us to link things in one
51   of these three modes by applying the appropriate combinations of
52   options at link-time.
53
54   When the -shared link option is used a final link is not being
55   done.  */
56
57#undef	LINK_SPEC
58#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} \
59  %{shared:-shared} \
60  %{!shared: \
61    %{!static: \
62      %{rdynamic:-export-dynamic} \
63      %{m32:%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
64      %{!m32:%{!dynamic-linker:-dynamic-linker /lib64/ld-linux-x86-64.so.2}}} \
65    %{static:-static}}"
66
67/* Similar to standard Linux, but adding -ffast-math support.  */
68#undef  ENDFILE_SPEC
69#define ENDFILE_SPEC \
70  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
71   %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
72
73#define MULTILIB_DEFAULTS { "m64" }
74
75#undef NEED_INDICATE_EXEC_STACK
76#define NEED_INDICATE_EXEC_STACK 1
77
78#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
79
80/* This macro may be overridden in i386/k*bsd-gnu.h.  */
81#define REG_NAME(reg) reg
82
83#ifdef TARGET_LIBC_PROVIDES_SSP
84/* i386 glibc provides __stack_chk_guard in %gs:0x14,
85   x86_64 glibc provides it in %fs:0x28.  */
86#define TARGET_THREAD_SSP_OFFSET	(TARGET_64BIT ? 0x28 : 0x14)
87#endif
88