gcc/config/rs6000/linux.h

   1 /* Definitions of target machine for GNU compiler,
   2    for PowerPC machines running Linux.
   3    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4    2004, 2005, 2006, 2007, 2010 Free Software Foundation, Inc.
   5    Contributed by Michael Meissner (meissner@cygnus.com).
   6
   7    This file is part of GCC.
   8
   9    GCC is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published
  11    by the Free Software Foundation; either version 3, or (at your
  12    option) any later version.
  13
  14    GCC is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GCC; see the file COPYING3.  If not see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
  24    process.  */
  25 #define OS_MISSING_POWERPC64 1
  26
  27 /* We use glibc _mcount for profiling.  */
  28 #define NO_PROFILE_COUNTERS 1
  29
  30 #ifdef SINGLE_LIBC
  31 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
  32 #else
  33 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
  34 #endif
  35
  36 /* glibc has float and long double forms of math functions.  */
  37 #undef  TARGET_C99_FUNCTIONS
  38 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
  39
  40 /* Whether we have sincos that follows the GNU extension.  */
  41 #undef  TARGET_HAS_SINCOS
  42 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
  43
  44 #undef  TARGET_OS_CPP_BUILTINS
  45 #define TARGET_OS_CPP_BUILTINS()                \
  46   do                                            \
  47     {                                           \
  48       builtin_define_std ("PPC");               \
  49       builtin_define_std ("powerpc");           \
  50       builtin_assert ("cpu=powerpc");           \
  51       builtin_assert ("machine=powerpc");       \
  52       TARGET_OS_SYSV_CPP_BUILTINS ();           \
  53     }                                           \
  54   while (0)
  55
  56 #undef  CPP_OS_DEFAULT_SPEC
  57 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
  58
  59 /* The GNU C++ standard library currently requires _GNU_SOURCE being
  60    defined on glibc-based systems. This temporary hack accomplishes this,
  61    it should go away as soon as libstdc++-v3 has a real fix.  */
  62 #undef  CPLUSPLUS_CPP_SPEC
  63 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  64
  65 #undef  LINK_SHLIB_SPEC
  66 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
  67
  68 #undef  LIB_DEFAULT_SPEC
  69 #define LIB_DEFAULT_SPEC "%(lib_linux)"
  70
  71 #undef  STARTFILE_DEFAULT_SPEC
  72 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
  73
  74 #undef  ENDFILE_DEFAULT_SPEC
  75 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
  76
  77 #undef  LINK_START_DEFAULT_SPEC
  78 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
  79
  80 #undef  LINK_OS_DEFAULT_SPEC
  81 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
  82
  83 #define LINK_GCC_C_SEQUENCE_SPEC \
  84   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
  85
  86 /* Use --as-needed -lgcc_s for eh support.  */
  87 #ifdef HAVE_LD_AS_NEEDED
  88 #define USE_LD_AS_NEEDED 1
  89 #endif
  90
  91 #undef  TARGET_VERSION
  92 #define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)");
  93
  94 /* Override rs6000.h definition.  */
  95 #undef  ASM_APP_ON
  96 #define ASM_APP_ON "#APP\n"
  97
  98 /* Override rs6000.h definition.  */
  99 #undef  ASM_APP_OFF
 100 #define ASM_APP_OFF "#NO_APP\n"
 101
 102 /* For backward compatibility, we must continue to use the AIX
 103    structure return convention.  */
 104 #undef  DRAFT_V4_STRUCT_RET
 105 #define DRAFT_V4_STRUCT_RET 1
 106
 107 /* We are 32-bit all the time, so optimize a little.  */
 108 #undef TARGET_64BIT
 109 #define TARGET_64BIT 0
 110
 111 /* We don't need to generate entries in .fixup, except when
 112    -mrelocatable or -mrelocatable-lib is given.  */
 113 #undef RELOCATABLE_NEEDS_FIXUP
 114 #define RELOCATABLE_NEEDS_FIXUP \
 115   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
 116
 117 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
 118
 119 #define TARGET_POSIX_IO
 120
 121 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 122
 123 #ifdef TARGET_LIBC_PROVIDES_SSP
 124 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2).  */
 125 #define TARGET_THREAD_SSP_OFFSET        -0x7008
 126 #endif
 127
 128 #define POWERPC_LINUX
 129
 130 /* ppc linux has 128-bit long double support in glibc 2.4 and later.  */
 131 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 132 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 133 #endif
 134
 135 /* Static stack checking is supported by means of probes.  */
 136 #define STACK_CHECK_STATIC_BUILTIN 1