gcc/config/netbsd.h

   1 /* Base configuration file for all NetBSD targets.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   3    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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* TARGET_OS_CPP_BUILTINS() common to all NetBSD targets.  */
  23 #define NETBSD_OS_CPP_BUILTINS_COMMON()         \
  24   do                                            \
  25     {                                           \
  26       builtin_define ("__NetBSD__");            \
  27       builtin_define ("__unix__");              \
  28       builtin_assert ("system=bsd");            \
  29       builtin_assert ("system=unix");           \
  30       builtin_assert ("system=NetBSD");         \
  31     }                                           \
  32   while (0)
  33
  34 /* CPP_SPEC parts common to all NetBSD targets.  */
  35 #define NETBSD_CPP_SPEC                         \
  36   "%{posix:-D_POSIX_SOURCE} \
  37    %{pthread:-D_REENTRANT -D_PTHREADS}"
  38
  39 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  40    source tree so it can be configured appropriately without using
  41    the GNU configure/build mechanism.  */
  42
  43 #ifdef NETBSD_NATIVE
  44
  45 /* Look for the include files in the system-defined places.  */
  46
  47 #undef GPLUSPLUS_INCLUDE_DIR
  48 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  49
  50 #undef GCC_INCLUDE_DIR
  51 #define GCC_INCLUDE_DIR "/usr/include"
  52
  53 #undef INCLUDE_DEFAULTS
  54 #define INCLUDE_DEFAULTS                        \
  55   {                                             \
  56     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },     \
  57     { GCC_INCLUDE_DIR, "GCC", 0, 0 },           \
  58     { 0, 0, 0, 0 }                              \
  59   }
  60
  61 /* Under NetBSD, the normal location of the compiler back ends is the
  62    /usr/libexec directory.  */
  63
  64 #undef STANDARD_EXEC_PREFIX
  65 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  66
  67 /* Under NetBSD, the normal location of the various *crt*.o files is the
  68    /usr/lib directory.  */
  69
  70 #undef STANDARD_STARTFILE_PREFIX
  71 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  72
  73 #endif /* NETBSD_NATIVE */
  74
  75
  76 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  77
  78    1. Select the appropriate set of libs, depending on whether we're
  79       profiling.
  80
  81    2. Include the pthread library if -pthread is specified (only
  82       if threads are enabled).
  83
  84    3. Include the posix library if -posix is specified.
  85
  86    FIXME: Could eliminate the duplication here if we were allowed to
  87    use string concatenation.  */
  88
  89 #ifdef NETBSD_ENABLE_PTHREADS
  90 #define NETBSD_LIB_SPEC         \
  91   "%{pthread:                   \
  92      %{!p:                      \
  93        %{!pg:-lpthread}}        \
  94      %{p:-lpthread_p}           \
  95      %{pg:-lpthread_p}}         \
  96    %{posix:                     \
  97      %{!p:                      \
  98        %{!pg:-lposix}}          \
  99      %{p:-lposix_p}             \
 100      %{pg:-lposix_p}}           \
 101    %{!shared:                   \
 102      %{!symbolic:               \
 103        %{!p:                    \
 104          %{!pg:-lc}}            \
 105        %{p:-lc_p}               \
 106        %{pg:-lc_p}}}"
 107 #else
 108 #define NETBSD_LIB_SPEC         \
 109   "%{posix:                     \
 110      %{!p:                      \
 111        %{!pg:-lposix}}          \
 112      %{p:-lposix_p}             \
 113      %{pg:-lposix_p}}           \
 114    %{!shared:                   \
 115      %{!symbolic:               \
 116        %{!p:                    \
 117          %{!pg:-lc}}            \
 118        %{p:-lc_p}               \
 119        %{pg:-lc_p}}}"
 120 #endif
 121
 122 #undef LIB_SPEC
 123 #define LIB_SPEC NETBSD_LIB_SPEC
 124
 125 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 126    libgcc with -symbolic.  */
 127
 128 #ifdef NETBSD_NATIVE
 129 #define NETBSD_LIBGCC_SPEC      \
 130   "%{!symbolic:                 \
 131      %{!shared:                 \
 132        %{!p:                    \
 133          %{!pg: -lgcc}}}        \
 134      %{shared: -lgcc_pic}       \
 135      %{p: -lgcc_p}              \
 136      %{pg: -lgcc_p}}"
 137 #else
 138 #define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 139 #endif
 140
 141 #undef LIBGCC_SPEC
 142 #define LIBGCC_SPEC NETBSD_LIBGCC_SPEC
 143
 144 /* When building shared libraries, the initialization and finalization
 145    functions for the library are .init and .fini respectively.  */
 146
 147 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 148   do {                                                                  \
 149     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 150     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 151   } while (0)
 152
 153 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 154   do {                                                                  \
 155     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 156     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 157   } while (0)
 158
 159 #undef TARGET_POSIX_IO
 160 #define TARGET_POSIX_IO
 161
 162 /* Handle #pragma weak and #pragma pack.  */
 163
 164 #define HANDLE_SYSV_PRAGMA 1
 165
 166 /* Don't assume anything about the header files.  */
 167 #undef  NO_IMPLICIT_EXTERN_C
 168 #define NO_IMPLICIT_EXTERN_C    1
 169
 170 /* Define some types that are the same on all NetBSD platforms,
 171    making them agree with <machine/ansi.h>.  */
 172
 173 #undef WCHAR_TYPE
 174 #define WCHAR_TYPE "int"
 175
 176 #undef WCHAR_TYPE_SIZE
 177 #define WCHAR_TYPE_SIZE 32
 178
 179 #undef WINT_TYPE
 180 #define WINT_TYPE "int"
 181 \f
 182
 183 /* Attempt to turn on execute permission for the stack.  This may be
 184    used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 185    if the target machine can change execute permissions on a page).
 186
 187    There is no way to query the execute permission of the stack, so
 188    we always issue the mprotect() call.
 189
 190    Note that we go out of our way to use namespace-non-invasive calls
 191    here.  Unfortunately, there is no libc-internal name for mprotect().
 192
 193    Also note that no errors should be emitted by this code; it is considered
 194    dangerous for library calls to send messages to stdout/stderr.  */
 195
 196 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 197 extern void __enable_execute_stack (void *);                            \
 198 void                                                                    \
 199 __enable_execute_stack (void *addr)                                     \
 200 {                                                                       \
 201   extern int mprotect (void *, size_t, int);                            \
 202   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 203                        void *, size_t);                                 \
 204                                                                         \
 205   static int size;                                                      \
 206   static long mask;                                                     \
 207                                                                         \
 208   char *page, *end;                                                     \
 209                                                                         \
 210   if (size == 0)                                                        \
 211     {                                                                   \
 212       int mib[2];                                                       \
 213       size_t len;                                                       \
 214                                                                         \
 215       mib[0] = 6; /* CTL_HW */                                          \
 216       mib[1] = 7; /* HW_PAGESIZE */                                     \
 217       len = sizeof (size);                                              \
 218       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 219       mask = ~((long) size - 1);                                        \
 220     }                                                                   \
 221                                                                         \
 222   page = (char *) (((long) addr) & mask);                               \
 223   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 224                                                                         \
 225   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 226   (void) mprotect (page, end - page, 7);                                \
 227 }