gcc/config/rs6000/lynx.h

   1 /* Definitions for Rs6000 running LynxOS.
   2    Copyright (C) 1995-2014 Free Software Foundation, Inc.
   3    Contributed by David Henkel-Wallace, Cygnus Support (gumby@cygnus.com)
   4    Rewritten by Adam Nemet, LynuxWorks Inc.
   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 /* Undefine the definition to enable the LynxOS default from the
  23    top-level lynx.h.  */
  24
  25 #undef SUBTARGET_EXTRA_SPECS
  26
  27 /* Get rid off the spec definitions from rs6000/sysv4.h.  */
  28
  29 #undef CPP_SPEC
  30 #define CPP_SPEC \
  31 "%{msoft-float: -D_SOFT_FLOAT} \
  32  %(cpp_cpu) \
  33  %(cpp_os_lynx)"
  34
  35 /* LynxOS only supports big-endian on PPC so we override the
  36    definition from sysv4.h.  Since the LynxOS 4.0 compiler was set to
  37    return every structure in memory regardless of their size we have
  38    to emulate the same behavior here with disabling the SVR4 structure
  39    returning.  */
  40
  41 #undef CC1_SPEC
  42 #define CC1_SPEC \
  43 "%{G*} %{mno-sdata:-msdata=none} \
  44  %{maltivec:-mabi=altivec} \
  45  -maix-struct-return"
  46
  47 #undef ASM_SPEC
  48 #define ASM_SPEC \
  49 "%(asm_cpu) \
  50  %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}"
  51
  52 #undef STARTFILE_SPEC
  53 #undef ENDFILE_SPEC
  54 #undef LIB_SPEC
  55 #undef LINK_SPEC
  56 #define LINK_SPEC \
  57 "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
  58  %(link_os_lynx)"
  59
  60 /* Override the definition from sysv4.h.  */
  61
  62 #undef TARGET_OS_CPP_BUILTINS
  63 #define TARGET_OS_CPP_BUILTINS()                \
  64   do                                            \
  65     {                                           \
  66       builtin_define ("__BIG_ENDIAN__");        \
  67       builtin_define ("__powerpc__");           \
  68       builtin_assert ("cpu=powerpc");           \
  69       builtin_assert ("machine=powerpc");       \
  70       builtin_define ("__PPC__");               \
  71     }                                           \
  72   while (0)
  73
  74 /* Override the rs6000.h definition.  */
  75
  76 #undef ASM_APP_ON
  77 #define ASM_APP_ON "#APP\n"
  78
  79 /* Override the rs6000.h definition.  */
  80
  81 #undef ASM_APP_OFF
  82 #define ASM_APP_OFF "#NO_APP\n"
  83
  84 /* LynxOS does not do anything with .fixup plus let's not create
  85    writable section for linkonce.r and linkonce.t.  */
  86
  87 #undef RELOCATABLE_NEEDS_FIXUP
  88
  89 /* Override these from rs6000.h with the generic definition.  */
  90
  91 #undef SIZE_TYPE
  92 #undef ASM_OUTPUT_ALIGN
  93 #undef PREFERRED_DEBUGGING_TYPE
  94
  95 /* The file rs6000.c defines TARGET_HAVE_TLS unconditionally to the
  96    value of HAVE_AS_TLS.  HAVE_AS_TLS is true as gas support for TLS
  97    is detected by configure.  Override the definition to false.  */
  98
  99 #undef HAVE_AS_TLS
 100 #define HAVE_AS_TLS 0
 101
 102 #define DBX_REGISTER_NUMBER(REGNO) rs6000_dbx_register_number (REGNO)
 103
 104 #ifdef CRT_BEGIN
 105 /* This function is part of crtbegin*.o which is at the beginning of
 106    the link and is called from .fini which is usually toward the end
 107    of the executable.  Make it longcall so that we don't limit the
 108    text size of the executables to 32M.  */
 109
 110 static void __do_global_dtors_aux (void) __attribute__ ((longcall));
 111 #endif  /* CRT_BEGIN */
 112
 113 #ifdef CRT_END
 114 /* Similarly here.  This function resides in crtend*.o which is toward
 115    to end of the link and is called from .init which is at the
 116    beginning.  */
 117
 118 static void __do_global_ctors_aux (void) __attribute__ ((longcall));
 119 #endif  /* CRT_END */