gnu/dist/gcc4/gcc/config/rs6000/netbsd.h

   1 /* Definitions of target machine for GNU compiler,
   2    for PowerPC NetBSD systems.
   3    Copyright 2002, 2003 Free Software Foundation, Inc.
   4    Contributed by Wasabi Systems, 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 2, 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 COPYING.  If not, write to the
  20    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 /* This defines which switch letters take arguments.  On NetBSD, most
  24    of the normal cases (defined by gcc.c) apply, and we also have -h*
  25    and -z* options (for the linker) (coming from SVR4).
  26    Copied from ../netbsd-elf.h and re{undef,defined} here to
  27    override the powerpc sysv4.h definition.
  28    netbsd-elf.h defines the default list + 'h' + 'z' + 'R'.
  29    rs6000/sysv4.h defines the default list + 'G'. */
  30
  31 #undef SWITCH_TAKES_ARG
  32 #define SWITCH_TAKES_ARG(CHAR)                  \
  33   (DEFAULT_SWITCH_TAKES_ARG (CHAR)              \
  34    || (CHAR) == 'h'                             \
  35    || (CHAR) == 'z'                             \
  36    || (CHAR) == 'R'                             \
  37    || (CHAR) == 'G')
  38
  39 #undef  TARGET_OS_CPP_BUILTINS  /* FIXME: sysv4.h should not define this! */
  40 #define TARGET_OS_CPP_BUILTINS()                \
  41   do                                            \
  42     {                                           \
  43       NETBSD_OS_CPP_BUILTINS_ELF();             \
  44       builtin_define ("__powerpc__");           \
  45       builtin_assert ("cpu=powerpc");           \
  46       builtin_assert ("machine=powerpc");       \
  47     }                                           \
  48   while (0)
  49
  50 /* Override the default from rs6000.h to avoid conflicts with macros
  51    defined in NetBSD header files.  */
  52
  53 #undef  RS6000_CPU_CPP_ENDIAN_BUILTINS
  54 #define RS6000_CPU_CPP_ENDIAN_BUILTINS()        \
  55   do                                            \
  56     {                                           \
  57       if (BYTES_BIG_ENDIAN)                     \
  58         {                                       \
  59           builtin_define ("__BIG_ENDIAN__");    \
  60           builtin_assert ("machine=bigendian"); \
  61         }                                       \
  62       else                                      \
  63         {                                       \
  64           builtin_define ("__LITTLE_ENDIAN__"); \
  65           builtin_assert ("machine=littleendian"); \
  66         }                                       \
  67     }                                           \
  68   while (0)
  69
  70 /* Make GCC agree with <machine/ansi.h>.  */
  71
  72 #undef  SIZE_TYPE
  73 #define SIZE_TYPE "unsigned int"
  74
  75 #undef  PTRDIFF_TYPE
  76 #define PTRDIFF_TYPE "int"
  77
  78 /* Redefine some types that where redefined by rs6000 include files.  */
  79
  80 #undef WCHAR_TYPE
  81 #define WCHAR_TYPE "int"
  82
  83 #undef WCHAR_TYPE_SIZE
  84 #define WCHAR_TYPE_SIZE 32
  85
  86 #undef WINT_TYPE
  87 #define WINT_TYPE "int"
  88
  89 /* Undo the spec mess from sysv4.h, and just define the specs
  90    the way NetBSD systems actually expect.  */
  91
  92 #undef  CPP_SPEC
  93 #define CPP_SPEC NETBSD_CPP_SPEC
  94
  95 #undef  LINK_SPEC
  96 #define LINK_SPEC \
  97   "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
  98    %(netbsd_link_spec)"
  99
 100 #define NETBSD_ENTRY_POINT "_start"
 101
 102 #undef  STARTFILE_SPEC
 103 #define STARTFILE_SPEC NETBSD_STARTFILE_SPEC
 104
 105 #undef  ENDFILE_SPEC
 106 #define ENDFILE_SPEC \
 107   "%(netbsd_endfile_spec)"
 108
 109 #undef  LIB_SPEC
 110 #define LIB_SPEC NETBSD_LIB_SPEC
 111
 112 #undef  SUBTARGET_EXTRA_SPECS
 113 #define SUBTARGET_EXTRA_SPECS                                   \
 114   { "netbsd_link_spec",         NETBSD_LINK_SPEC_ELF },         \
 115   { "netbsd_entry_point",       NETBSD_ENTRY_POINT },           \
 116   { "netbsd_endfile_spec",      NETBSD_ENDFILE_SPEC },
 117
 118 /*
 119  * Add NetBSD specific defaults: -mpowerpc -mnew_mnemonics -mstrict-align
 120  */
 121 #undef TARGET_DEFAULT
 122 #define TARGET_DEFAULT (MASK_POWERPC | MASK_NEW_MNEMONICS | MASK_STRICT_ALIGN)
 123
 124 /* Attempt to enable execute permissions on the stack.  */
 125 #define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK
 126 #ifdef L_trampoline
 127 #undef TRAMPOLINE_SIZE
 128 #define TRAMPOLINE_SIZE 48
 129 #endif
 130
 131 /* Make sure _enable_execute_stack() isn't the empty function in libgcc2.c.
 132    It gets defined in _trampoline.o via NETBSD_ENABLE_EXECUTE_STACK.  */
 133 #undef ENABLE_EXECUTE_STACK
 134 #define ENABLE_EXECUTE_STACK
 135
 136 /* Override STACK_BOUNDARY to use Altivec compliant one.  */
 137 #undef STACK_BOUNDARY
 138 #define STACK_BOUNDARY  128
 139
 140 #undef  TARGET_VERSION
 141 #define TARGET_VERSION fprintf (stderr, " (NetBSD/powerpc ELF)");