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1 /* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format.
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2 Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009
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3 Free Software Foundation, Inc.
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4 Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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26
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27 #if TARGET_64BIT_DEFAULT
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28 #define TARGET_VERSION fprintf (stderr, " (x86-64 Linux/ELF)");
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29 #else
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30 #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
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31 #endif
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32
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33 #define TARGET_OS_CPP_BUILTINS() \
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34 do \
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35 { \
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36 LINUX_TARGET_OS_CPP_BUILTINS(); \
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37 } \
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38 while (0)
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39
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40 #undef CPP_SPEC
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41 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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42
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43 /* The svr4 ABI for the i386 says that records and unions are returned
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44 in memory. In the 64bit compilation we will turn this flag off in
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45 override_options, as we never do pcc_struct_return scheme on this target. */
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46 #undef DEFAULT_PCC_STRUCT_RETURN
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47 #define DEFAULT_PCC_STRUCT_RETURN 1
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48
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49 /* We arrange for the whole %fs segment to map the tls area. */
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50 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
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51 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
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52
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53 /* Provide a LINK_SPEC. Here we provide support for the special GCC
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54 options -static and -shared, which allow us to link things in one
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55 of these three modes by applying the appropriate combinations of
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56 options at link-time.
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57
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58 When the -shared link option is used a final link is not being
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59 done. */
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60
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61 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
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62 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
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63
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64 #undef ASM_SPEC
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65 #define ASM_SPEC "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} \
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66 %{Wa,*:%*} %{m32:--32} %{m64:--64} \
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67 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
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68
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69 #if TARGET_64BIT_DEFAULT
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70 #define SPEC_32 "m32"
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71 #define SPEC_64 "!m32"
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72 #else
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73 #define SPEC_32 "!m64"
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74 #define SPEC_64 "m64"
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75 #endif
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76
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77 #undef LINK_SPEC
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78 #define LINK_SPEC "%{" SPEC_64 ":-m elf_x86_64} %{" SPEC_32 ":-m elf_i386} \
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79 %{shared:-shared} \
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80 %{!shared: \
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81 %{!static: \
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82 %{rdynamic:-export-dynamic} \
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83 %{" SPEC_32 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}} \
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84 %{" SPEC_64 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}} \
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85 %{static:-static}}"
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86
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87 /* Similar to standard Linux, but adding -ffast-math support. */
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88 #undef ENDFILE_SPEC
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89 #define ENDFILE_SPEC \
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90 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
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91 %{mpc32:crtprec32.o%s} \
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92 %{mpc64:crtprec64.o%s} \
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93 %{mpc80:crtprec80.o%s} \
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94 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
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95
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96 #if TARGET_64BIT_DEFAULT
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97 #define MULTILIB_DEFAULTS { "m64" }
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98 #else
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99 #define MULTILIB_DEFAULTS { "m32" }
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100 #endif
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101
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102 /* Put all *tf routines in libgcc. */
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103 #undef LIBGCC2_HAS_TF_MODE
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104 #define LIBGCC2_HAS_TF_MODE 1
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105 #define LIBGCC2_TF_CEXT q
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106 #define TF_SIZE 113
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107
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108 #undef NEED_INDICATE_EXEC_STACK
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109 #define NEED_INDICATE_EXEC_STACK 1
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110
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111 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
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112
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113 /* This macro may be overridden in i386/k*bsd-gnu.h. */
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114 #define REG_NAME(reg) reg
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115
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116 #ifdef TARGET_LIBC_PROVIDES_SSP
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117 /* i386 glibc provides __stack_chk_guard in %gs:0x14,
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118 x86_64 glibc provides it in %fs:0x28. */
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119 #define TARGET_THREAD_SSP_OFFSET (TARGET_64BIT ? 0x28 : 0x14)
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120 #endif
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