gcc/config/netbsd.h

   1 /* Base configuration file for all NetBSD targets.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3    2007 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* TARGET_OS_CPP_BUILTINS() common to all NetBSD targets.  */
  22 #define NETBSD_OS_CPP_BUILTINS_COMMON()         \
  23   do                                            \
  24     {                                           \
  25       builtin_define ("__NetBSD__");            \
  26       builtin_define ("__unix__");              \
  27       builtin_assert ("system=bsd");            \
  28       builtin_assert ("system=unix");           \
  29       builtin_assert ("system=NetBSD");         \
  30     }                                           \
  31   while (0)
  32
  33 /* CPP_SPEC parts common to all NetBSD targets.  */
  34 #define NETBSD_CPP_SPEC                         \
  35   "%{posix:-D_POSIX_SOURCE} \
  36    %{pthread:-D_REENTRANT -D_PTHREADS}"
  37
  38 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  39    source tree so it can be configured appropriately without using
  40    the GNU configure/build mechanism.  */
  41
  42 #ifdef NETBSD_NATIVE
  43
  44 /* Look for the include files in the system-defined places.  */
  45
  46 #undef GPLUSPLUS_INCLUDE_DIR
  47 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  48
  49 #undef GCC_INCLUDE_DIR
  50 #define GCC_INCLUDE_DIR "/usr/include"
  51
  52 #undef INCLUDE_DEFAULTS
  53 #define INCLUDE_DEFAULTS                        \
  54   {                                             \
  55     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },     \
  56     { GCC_INCLUDE_DIR, "GCC", 0, 0 },           \
  57     { 0, 0, 0, 0 }                              \
  58   }
  59
  60 /* Under NetBSD, the normal location of the compiler back ends is the
  61    /usr/libexec directory.  */
  62
  63 #undef STANDARD_EXEC_PREFIX
  64 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  65
  66 /* Under NetBSD, the normal location of the various *crt*.o files is the
  67    /usr/lib directory.  */
  68
  69 #undef STANDARD_STARTFILE_PREFIX
  70 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  71
  72 #endif /* NETBSD_NATIVE */
  73
  74
  75 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  76
  77    1. Select the appropriate set of libs, depending on whether we're
  78       profiling.
  79
  80    2. Include the pthread library if -pthread is specified (only
  81       if threads are enabled).
  82
  83    3. Include the posix library if -posix is specified.
  84
  85    FIXME: Could eliminate the duplication here if we were allowed to
  86    use string concatenation.  */
  87
  88 #ifdef NETBSD_ENABLE_PTHREADS
  89 #define NETBSD_LIB_SPEC         \
  90   "%{pthread:                   \
  91      %{!p:                      \
  92        %{!pg:-lpthread}}        \
  93      %{p:-lpthread_p}           \
  94      %{pg:-lpthread_p}}         \
  95    %{posix:                     \
  96      %{!p:                      \
  97        %{!pg:-lposix}}          \
  98      %{p:-lposix_p}             \
  99      %{pg:-lposix_p}}           \
 100    %{!shared:                   \
 101      %{!symbolic:               \
 102        %{!p:                    \
 103          %{!pg:-lc}}            \
 104        %{p:-lc_p}               \
 105        %{pg:-lc_p}}}"
 106 #else
 107 #define NETBSD_LIB_SPEC         \
 108   "%{posix:                     \
 109      %{!p:                      \
 110        %{!pg:-lposix}}          \
 111      %{p:-lposix_p}             \
 112      %{pg:-lposix_p}}           \
 113    %{!shared:                   \
 114      %{!symbolic:               \
 115        %{!p:                    \
 116          %{!pg:-lc}}            \
 117        %{p:-lc_p}               \
 118        %{pg:-lc_p}}}"
 119 #endif
 120
 121 #undef LIB_SPEC
 122 #define LIB_SPEC NETBSD_LIB_SPEC
 123
 124 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 125    libgcc with -symbolic.  */
 126
 127 #ifdef NETBSD_NATIVE
 128 #define NETBSD_LIBGCC_SPEC      \
 129   "%{!symbolic:                 \
 130      %{!shared:                 \
 131        %{!p:                    \
 132          %{!pg: -lgcc}}}        \
 133      %{shared: -lgcc_pic}       \
 134      %{p: -lgcc_p}              \
 135      %{pg: -lgcc_p}}"
 136 #else
 137 #define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 138 #endif
 139
 140 #undef LIBGCC_SPEC
 141 #define LIBGCC_SPEC NETBSD_LIBGCC_SPEC
 142
 143 /* When building shared libraries, the initialization and finalization
 144    functions for the library are .init and .fini respectively.  */
 145
 146 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 147   do {                                                                  \
 148     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 149     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 150   } while (0)
 151
 152 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 153   do {                                                                  \
 154     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 155     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 156   } while (0)
 157
 158 #undef TARGET_POSIX_IO
 159 #define TARGET_POSIX_IO
 160
 161 /* Handle #pragma weak and #pragma pack.  */
 162
 163 #define HANDLE_SYSV_PRAGMA 1
 164
 165 /* Don't assume anything about the header files.  */
 166 #undef  NO_IMPLICIT_EXTERN_C
 167 #define NO_IMPLICIT_EXTERN_C    1
 168
 169 /* Define some types that are the same on all NetBSD platforms,
 170    making them agree with <machine/ansi.h>.  */
 171
 172 #undef WCHAR_TYPE
 173 #define WCHAR_TYPE "int"
 174
 175 #undef WCHAR_TYPE_SIZE
 176 #define WCHAR_TYPE_SIZE 32
 177
 178 #undef WINT_TYPE
 179 #define WINT_TYPE "int"
 180 \f
 181
 182 /* Attempt to turn on execute permission for the stack.  This may be
 183    used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 184    if the target machine can change execute permissions on a page).
 185
 186    There is no way to query the execute permission of the stack, so
 187    we always issue the mprotect() call.
 188
 189    Note that we go out of our way to use namespace-non-invasive calls
 190    here.  Unfortunately, there is no libc-internal name for mprotect().
 191
 192    Also note that no errors should be emitted by this code; it is considered
 193    dangerous for library calls to send messages to stdout/stderr.  */
 194
 195 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 196 extern void __enable_execute_stack (void *);                            \
 197 void                                                                    \
 198 __enable_execute_stack (void *addr)                                     \
 199 {                                                                       \
 200   extern int mprotect (void *, size_t, int);                            \
 201   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 202                        void *, size_t);                                 \
 203                                                                         \
 204   static int size;                                                      \
 205   static long mask;                                                     \
 206                                                                         \
 207   char *page, *end;                                                     \
 208                                                                         \
 209   if (size == 0)                                                        \
 210     {                                                                   \
 211       int mib[2];                                                       \
 212       size_t len;                                                       \
 213                                                                         \
 214       mib[0] = 6; /* CTL_HW */                                          \
 215       mib[1] = 7; /* HW_PAGESIZE */                                     \
 216       len = sizeof (size);                                              \
 217       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 218       mask = ~((long) size - 1);                                        \
 219     }                                                                   \
 220                                                                         \
 221   page = (char *) (((long) addr) & mask);                               \
 222   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 223                                                                         \
 224   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 225   (void) mprotect (page, end - page, 7);                                \
 226 }
 227
 228 /* Define this so we can compile MS code for use with WINE.  */
 229 #define HANDLE_PRAGMA_PACK_PUSH_POP 1