gnu/dist/gcc4/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 Free Software Foundation, Inc.
   3    Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, 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