gcc/config/rs6000/lynx.h

   1 /* Definitions for Rs6000 running LynxOS.
   2    Copyright (C) 1995, 1996, 2000, 2002, 2003, 2004, 2005
   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 2, 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 COPYING.  If not, write to the
  21    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 /* Override the definition in sysv4.h.  */
  25
  26 #undef TARGET_VERSION
  27 #define TARGET_VERSION fputs (" (PowerPC/LynxOS)", stderr);
  28
  29 /* Undefine the definition to enable the LynxOS default from the
  30    top-level lynx.h.  */
  31
  32 #undef SUBTARGET_EXTRA_SPECS
  33
  34 /* Get rid off the spec definitions from rs6000/sysv4.h.  */
  35
  36 #undef CPP_SPEC
  37 #define CPP_SPEC \
  38 "%{msoft-float: -D_SOFT_FLOAT} \
  39  %(cpp_cpu) \
  40  %(cpp_os_lynx)"
  41
  42 /* LynxOS only supports big-endian on PPC so we override the
  43    definition from sysv4.h.  Since the LynxOS 4.0 compiler was set to
  44    return every structure in memory regardless of their size we have
  45    to emulate the same behavior here with disabling the SVR4 structure
  46    returning.  */
  47
  48 #undef CC1_SPEC
  49 #define CC1_SPEC \
  50 "%{G*} %{mno-sdata:-msdata=none} \
  51  %{maltivec:-mabi=altivec} \
  52  -maix-struct-return"
  53
  54 #undef ASM_SPEC
  55 #define ASM_SPEC \
  56 "%(asm_cpu) \
  57  %{.s: %{mregnames} %{mno-regnames}} \
  58  %{.S: %{mregnames} %{mno-regnames}}"
  59
  60 #undef STARTFILE_SPEC
  61 #undef ENDFILE_SPEC
  62 #undef LIB_SPEC
  63 #undef LINK_SPEC
  64 #define LINK_SPEC \
  65 "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
  66  %(link_os_lynx)"
  67
  68 /* Override the definition from sysv4.h.  */
  69
  70 #undef TARGET_OS_CPP_BUILTINS
  71 #define TARGET_OS_CPP_BUILTINS()                \
  72   do                                            \
  73     {                                           \
  74       builtin_define ("__BIG_ENDIAN__");        \
  75       builtin_define ("__powerpc__");           \
  76       builtin_assert ("cpu=powerpc");           \
  77       builtin_assert ("machine=powerpc");       \
  78       builtin_define ("__PPC__");               \
  79     }                                           \
  80   while (0)
  81
  82 /* Override the rs6000.h definition.  */
  83
  84 #undef ASM_APP_ON
  85 #define ASM_APP_ON "#APP\n"
  86
  87 /* Override the rs6000.h definition.  */
  88
  89 #undef ASM_APP_OFF
  90 #define ASM_APP_OFF "#NO_APP\n"
  91
  92 /* LynxOS does not do anything with .fixup plus let's not create
  93    writable section for linkonce.r and linkonce.t.  */
  94
  95 #undef RELOCATABLE_NEEDS_FIXUP
  96
  97 /* Override these from rs6000.h with the generic definition.  */
  98
  99 #undef SIZE_TYPE
 100 #undef ASM_OUTPUT_ALIGN
 101 #undef PREFERRED_DEBUGGING_TYPE
 102
 103 /* The file rs6000.c defines TARGET_HAVE_TLS unconditionally to the
 104    value of HAVE_AS_TLS.  HAVE_AS_TLS is true as gas support for TLS
 105    is detected by configure.  Override the definition to false.  */
 106
 107 #undef HAVE_AS_TLS
 108 #define HAVE_AS_TLS 0