gcc/config/rs6000/linux.h

   1 /* Definitions of target machine for GNU compiler,
   2    for PowerPC machines running Linux.
   3    Copyright (C) 1996-2013 Free Software Foundation, Inc.
   4    Contributed by Michael Meissner (meissner@cygnus.com).
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    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 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
  23    process.  */
  24 #define OS_MISSING_POWERPC64 1
  25
  26 /* We use glibc _mcount for profiling.  */
  27 #define NO_PROFILE_COUNTERS 1
  28
  29 #ifdef SINGLE_LIBC
  30 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
  31 #else
  32 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
  33 #endif
  34
  35 /* glibc has float and long double forms of math functions.  */
  36 #undef  TARGET_C99_FUNCTIONS
  37 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
  38
  39 /* Whether we have sincos that follows the GNU extension.  */
  40 #undef  TARGET_HAS_SINCOS
  41 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
  42
  43 #undef  TARGET_OS_CPP_BUILTINS
  44 #define TARGET_OS_CPP_BUILTINS()                \
  45   do                                            \
  46     {                                           \
  47       builtin_define_std ("PPC");               \
  48       builtin_define_std ("powerpc");           \
  49       builtin_assert ("cpu=powerpc");           \
  50       builtin_assert ("machine=powerpc");       \
  51       TARGET_OS_SYSV_CPP_BUILTINS ();           \
  52     }                                           \
  53   while (0)
  54
  55 #undef  CPP_OS_DEFAULT_SPEC
  56 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
  57
  58 /* The GNU C++ standard library currently requires _GNU_SOURCE being
  59    defined on glibc-based systems. This temporary hack accomplishes this,
  60    it should go away as soon as libstdc++-v3 has a real fix.  */
  61 #undef  CPLUSPLUS_CPP_SPEC
  62 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  63
  64 #undef  LINK_SHLIB_SPEC
  65 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
  66
  67 #undef  LIB_DEFAULT_SPEC
  68 #define LIB_DEFAULT_SPEC "%(lib_linux)"
  69
  70 #undef  STARTFILE_DEFAULT_SPEC
  71 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
  72
  73 #undef  ENDFILE_DEFAULT_SPEC
  74 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
  75
  76 #undef  LINK_START_DEFAULT_SPEC
  77 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
  78
  79 #undef  LINK_OS_DEFAULT_SPEC
  80 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
  81
  82 #define LINK_GCC_C_SEQUENCE_SPEC \
  83   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
  84
  85 /* Use --as-needed -lgcc_s for eh support.  */
  86 #ifdef HAVE_LD_AS_NEEDED
  87 #define USE_LD_AS_NEEDED 1
  88 #endif
  89
  90 /* Override rs6000.h definition.  */
  91 #undef  ASM_APP_ON
  92 #define ASM_APP_ON "#APP\n"
  93
  94 /* Override rs6000.h definition.  */
  95 #undef  ASM_APP_OFF
  96 #define ASM_APP_OFF "#NO_APP\n"
  97
  98 /* For backward compatibility, we must continue to use the AIX
  99    structure return convention.  */
 100 #undef  DRAFT_V4_STRUCT_RET
 101 #define DRAFT_V4_STRUCT_RET 1
 102
 103 /* We are 32-bit all the time, so optimize a little.  */
 104 #undef TARGET_64BIT
 105 #define TARGET_64BIT 0
 106
 107 /* We don't need to generate entries in .fixup, except when
 108    -mrelocatable or -mrelocatable-lib is given.  */
 109 #undef RELOCATABLE_NEEDS_FIXUP
 110 #define RELOCATABLE_NEEDS_FIXUP \
 111   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
 112
 113 #define TARGET_POSIX_IO
 114
 115 #ifdef TARGET_LIBC_PROVIDES_SSP
 116 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2).  */
 117 #define TARGET_THREAD_SSP_OFFSET        -0x7008
 118 #endif
 119
 120 #define POWERPC_LINUX
 121
 122 /* ppc linux has 128-bit long double support in glibc 2.4 and later.  */
 123 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 124 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 125 #endif
 126
 127 /* Static stack checking is supported by means of probes.  */
 128 #define STACK_CHECK_STATIC_BUILTIN 1