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
   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 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #if TARGET_64BIT_DEFAULT
  23 #define TARGET_VERSION fprintf (stderr, " (x86-64 Linux/ELF)");
  24 #else
  25 #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
  26 #endif
  27
  28 #define TARGET_OS_CPP_BUILTINS()                                \
  29   do                                                            \
  30     {                                                           \
  31         LINUX_TARGET_OS_CPP_BUILTINS();                         \
  32     }                                                           \
  33   while (0)
  34
  35 #undef CPP_SPEC
  36 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
  37
  38 /* The svr4 ABI for the i386 says that records and unions are returned
  39    in memory.  In the 64bit compilation we will turn this flag off in
  40    override_options, as we never do pcc_struct_return scheme on this target.  */
  41 #undef DEFAULT_PCC_STRUCT_RETURN
  42 #define DEFAULT_PCC_STRUCT_RETURN 1
  43
  44 /* We arrange for the whole %fs segment to map the tls area.  */
  45 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
  46 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
  47
  48 /* Provide a LINK_SPEC.  Here we provide support for the special GCC
  49    options -static and -shared, which allow us to link things in one
  50    of these three modes by applying the appropriate combinations of
  51    options at link-time.
  52
  53    When the -shared link option is used a final link is not being
  54    done.  */
  55
  56 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
  57 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
  58
  59 #if TARGET_64BIT_DEFAULT
  60 #define SPEC_32 "m32"
  61 #define SPEC_64 "!m32"
  62 #else
  63 #define SPEC_32 "!m64"
  64 #define SPEC_64 "m64"
  65 #endif
  66
  67 #undef  LINK_SPEC
  68 #define LINK_SPEC "%{" SPEC_64 ":-m elf_x86_64} %{" SPEC_32 ":-m elf_i386} \
  69   %{shared:-shared} \
  70   %{!shared: \
  71     %{!static: \
  72       %{rdynamic:-export-dynamic} \
  73       %{" SPEC_32 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}} \
  74       %{" SPEC_64 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}} \
  75     %{static:-static}}"
  76
  77 /* Similar to standard Linux, but adding -ffast-math support.  */
  78 #undef  ENDFILE_SPEC
  79 #define ENDFILE_SPEC \
  80   "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
  81    %{mpc32:crtprec32.o%s} \
  82    %{mpc64:crtprec64.o%s} \
  83    %{mpc80:crtprec80.o%s} \
  84    %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
  85
  86 #if TARGET_64BIT_DEFAULT
  87 #define MULTILIB_DEFAULTS { "m64" }
  88 #else
  89 #define MULTILIB_DEFAULTS { "m32" }
  90 #endif
  91
  92 /* Put all *tf routines in libgcc.  */
  93 #undef LIBGCC2_HAS_TF_MODE
  94 #define LIBGCC2_HAS_TF_MODE 1
  95 #define LIBGCC2_TF_CEXT q
  96 #define TF_SIZE 113
  97
  98 #undef NEED_INDICATE_EXEC_STACK
  99 #define NEED_INDICATE_EXEC_STACK 1
 100
 101 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
 102
 103 /* This macro may be overridden in i386/k*bsd-gnu.h.  */
 104 #define REG_NAME(reg) reg
 105
 106 #ifdef TARGET_LIBC_PROVIDES_SSP
 107 /* i386 glibc provides __stack_chk_guard in %gs:0x14,
 108    x86_64 glibc provides it in %fs:0x28.  */
 109 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? 0x28 : 0x14)
 110 #endif