linux64.h revision 1.1.1.1.4.2 
1/* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format.
2   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3   Free Software Foundation, Inc.
4   Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 3, or (at your option)
11any later version.
12
13GCC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18Under Section 7 of GPL version 3, you are granted additional
19permissions described in the GCC Runtime Library Exception, version
203.1, as published by the Free Software Foundation.
21
22You should have received a copy of the GNU General Public License and
23a copy of the GCC Runtime Library Exception along with this program;
24see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
25<http://www.gnu.org/licenses/>.  */
26
27#if TARGET_64BIT_DEFAULT
28#define TARGET_VERSION fprintf (stderr, " (x86-64 Linux/ELF)");
29#else
30#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
31#endif
32
33#define TARGET_OS_CPP_BUILTINS()				\
34  do								\
35    {								\
36	LINUX_TARGET_OS_CPP_BUILTINS();				\
37    }								\
38  while (0)
39
40#undef CPP_SPEC
41#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
42
43/* The svr4 ABI for the i386 says that records and unions are returned
44   in memory.  In the 64bit compilation we will turn this flag off in
45   override_options, as we never do pcc_struct_return scheme on this target.  */
46#undef DEFAULT_PCC_STRUCT_RETURN
47#define DEFAULT_PCC_STRUCT_RETURN 1
48
49/* We arrange for the whole %fs segment to map the tls area.  */
50#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
51#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
52
53/* Provide a LINK_SPEC.  Here we provide support for the special GCC
54   options -static and -shared, which allow us to link things in one
55   of these three modes by applying the appropriate combinations of
56   options at link-time.
57
58   When the -shared link option is used a final link is not being
59   done.  */
60
61#define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
62#define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
63
64#if TARGET_64BIT_DEFAULT
65#define SPEC_32 "m32"
66#define SPEC_64 "!m32"
67#else
68#define SPEC_32 "!m64"
69#define SPEC_64 "m64"
70#endif
71
72#undef ASM_SPEC
73#define ASM_SPEC "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} \
74 %{Wa,*:%*} %{" SPEC_32 ":--32} %{" SPEC_64 ":--64} \
75 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
76
77#undef	LINK_SPEC
78#define LINK_SPEC "%{" SPEC_64 ":-m elf_x86_64} %{" SPEC_32 ":-m elf_i386} \
79  %{shared:-shared} \
80  %{!shared: \
81    %{!static: \
82      %{rdynamic:-export-dynamic} \
83      %{" SPEC_32 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}} \
84      %{" SPEC_64 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}} \
85    %{static:-static}}"
86
87/* Similar to standard Linux, but adding -ffast-math support.  */
88#undef  ENDFILE_SPEC
89#define ENDFILE_SPEC \
90  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
91   %{mpc32:crtprec32.o%s} \
92   %{mpc64:crtprec64.o%s} \
93   %{mpc80:crtprec80.o%s} \
94   %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
95
96#if TARGET_64BIT_DEFAULT
97#define MULTILIB_DEFAULTS { "m64" }
98#else
99#define MULTILIB_DEFAULTS { "m32" }
100#endif
101
102/* Put all *tf routines in libgcc.  */
103#undef LIBGCC2_HAS_TF_MODE
104#define LIBGCC2_HAS_TF_MODE 1
105#define LIBGCC2_TF_CEXT q
106#define TF_SIZE 113
107
108#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
109
110#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
111
112/* The stack pointer needs to be moved while checking the stack.  */
113#define STACK_CHECK_MOVING_SP 1
114
115/* This macro may be overridden in i386/k*bsd-gnu.h.  */
116#define REG_NAME(reg) reg
117
118#ifdef TARGET_LIBC_PROVIDES_SSP
119/* i386 glibc provides __stack_chk_guard in %gs:0x14,
120   x86_64 glibc provides it in %fs:0x28.  */
121#define TARGET_THREAD_SSP_OFFSET	(TARGET_64BIT ? 0x28 : 0x14)
122#endif
123