gcc/config/rs6000/lynx.h

   1 /* Definitions for Rs6000 running LynxOS.
   2    Copyright (C) 1995, 1996, 2000, 2002, 2003, 2004, 2005, 2007, 2010, 2011
   3    Free Software Foundation, Inc.
   4    Contributed by David Henkel-Wallace, Cygnus Support (gumby@cygnus.com)
   5    Rewritten by Adam Nemet, LynuxWorks Inc.
   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 /* Undefine the definition to enable the LynxOS default from the
  24    top-level lynx.h.  */
  25
  26 #undef SUBTARGET_EXTRA_SPECS
  27
  28 /* Get rid off the spec definitions from rs6000/sysv4.h.  */
  29
  30 #undef CPP_SPEC
  31 #define CPP_SPEC \
  32 "%{msoft-float: -D_SOFT_FLOAT} \
  33  %(cpp_cpu) \
  34  %(cpp_os_lynx)"
  35
  36 /* LynxOS only supports big-endian on PPC so we override the
  37    definition from sysv4.h.  Since the LynxOS 4.0 compiler was set to
  38    return every structure in memory regardless of their size we have
  39    to emulate the same behavior here with disabling the SVR4 structure
  40    returning.  */
  41
  42 #undef CC1_SPEC
  43 #define CC1_SPEC \
  44 "%{G*} %{mno-sdata:-msdata=none} \
  45  %{maltivec:-mabi=altivec} \
  46  -maix-struct-return"
  47
  48 #undef ASM_SPEC
  49 #define ASM_SPEC \
  50 "%(asm_cpu) \
  51  %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}"
  52
  53 #undef STARTFILE_SPEC
  54 #undef ENDFILE_SPEC
  55 #undef LIB_SPEC
  56 #undef LINK_SPEC
  57 #define LINK_SPEC \
  58 "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
  59  %(link_os_lynx)"
  60
  61 /* Override the definition from sysv4.h.  */
  62
  63 #undef TARGET_OS_CPP_BUILTINS
  64 #define TARGET_OS_CPP_BUILTINS()                \
  65   do                                            \
  66     {                                           \
  67       builtin_define ("__BIG_ENDIAN__");        \
  68       builtin_define ("__powerpc__");           \
  69       builtin_assert ("cpu=powerpc");           \
  70       builtin_assert ("machine=powerpc");       \
  71       builtin_define ("__PPC__");               \
  72     }                                           \
  73   while (0)
  74
  75 /* Override the rs6000.h definition.  */
  76
  77 #undef ASM_APP_ON
  78 #define ASM_APP_ON "#APP\n"
  79
  80 /* Override the rs6000.h definition.  */
  81
  82 #undef ASM_APP_OFF
  83 #define ASM_APP_OFF "#NO_APP\n"
  84
  85 /* LynxOS does not do anything with .fixup plus let's not create
  86    writable section for linkonce.r and linkonce.t.  */
  87
  88 #undef RELOCATABLE_NEEDS_FIXUP
  89
  90 /* Override these from rs6000.h with the generic definition.  */
  91
  92 #undef SIZE_TYPE
  93 #undef ASM_OUTPUT_ALIGN
  94 #undef PREFERRED_DEBUGGING_TYPE
  95
  96 /* The file rs6000.c defines TARGET_HAVE_TLS unconditionally to the
  97    value of HAVE_AS_TLS.  HAVE_AS_TLS is true as gas support for TLS
  98    is detected by configure.  Override the definition to false.  */
  99
 100 #undef HAVE_AS_TLS
 101 #define HAVE_AS_TLS 0
 102
 103 #define DBX_REGISTER_NUMBER(REGNO) rs6000_dbx_register_number (REGNO)
 104
 105 #ifdef CRT_BEGIN
 106 /* This function is part of crtbegin*.o which is at the beginning of
 107    the link and is called from .fini which is usually toward the end
 108    of the executable.  Make it longcall so that we don't limit the
 109    text size of the executables to 32M.  */
 110
 111 static void __do_global_dtors_aux (void) __attribute__ ((longcall));
 112 #endif  /* CRT_BEGIN */
 113
 114 #ifdef CRT_END
 115 /* Similarly here.  This function resides in crtend*.o which is toward
 116    to end of the link and is called from .init which is at the
 117    beginning.  */
 118
 119 static void __do_global_ctors_aux (void) __attribute__ ((longcall));
 120 #endif  /* CRT_END */