gcc/config/i386/linux64.h

   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
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see 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    ix86_option_override_internal, as we never do pcc_struct_return
  46    scheme on this target.  */
  47 #undef DEFAULT_PCC_STRUCT_RETURN
  48 #define DEFAULT_PCC_STRUCT_RETURN 1
  49
  50 /* We arrange for the whole %fs segment to map the tls area.  */
  51 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
  52 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
  53
  54 /* Provide a LINK_SPEC.  Here we provide support for the special GCC
  55    options -static and -shared, which allow us to link things in one
  56    of these three modes by applying the appropriate combinations of
  57    options at link-time.
  58
  59    When the -shared link option is used a final link is not being
  60    done.  */
  61
  62 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
  63 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
  64
  65 #if TARGET_64BIT_DEFAULT
  66 #define SPEC_32 "m32"
  67 #define SPEC_64 "!m32"
  68 #else
  69 #define SPEC_32 "!m64"
  70 #define SPEC_64 "m64"
  71 #endif
  72
  73 #undef ASM_SPEC
  74 #define ASM_SPEC "%{" 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 " LINUX_DYNAMIC_LINKER32 "} \
  84       %{" SPEC_64 ":-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 /* Static stack checking is supported by means of probes.  */
 116 #define STACK_CHECK_STATIC_BUILTIN 1
 117
 118 /* This macro may be overridden in i386/k*bsd-gnu.h.  */
 119 #define REG_NAME(reg) reg
 120
 121 #ifdef TARGET_LIBC_PROVIDES_SSP
 122 /* i386 glibc provides __stack_chk_guard in %gs:0x14,
 123    x86_64 glibc provides it in %fs:0x28.  */
 124 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? 0x28 : 0x14)
 125
 126 /* We steal the last transactional memory word.  */
 127 #define TARGET_CAN_SPLIT_STACK
 128 #define TARGET_THREAD_SPLIT_STACK_OFFSET (TARGET_64BIT ? 0x70 : 0x30)
 129 #endif