gnu/dist/gcc4/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       if (flag_pic)                             \
  32         {                                       \
  33           builtin_define ("__PIC__");           \
  34           builtin_define ("__pic__");           \
  35         }                                       \
  36     }                                           \
  37   while (0)
  38
  39 /* CPP_SPEC parts common to all NetBSD targets.  */
  40 #define NETBSD_CPP_SPEC                         \
  41   "%{posix:-D_POSIX_SOURCE} \
  42    %{pthread:-D_REENTRANT -D_PTHREADS}"
  43
  44 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  45    source tree so it can be configured appropriately without using
  46    the GNU configure/build mechanism.  */
  47
  48 #ifdef NETBSD_NATIVE
  49
  50 /* Look for the include files in the system-defined places.  */
  51
  52 #undef GPLUSPLUS_INCLUDE_DIR
  53 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  54
  55 #undef GPLUSPLUS_BACKWARD_INCLUDE_DIR
  56 #define GPLUSPLUS_BACKWARD_INCLUDE_DIR "/usr/include/g++/backward"
  57
  58 #undef GCC_INCLUDE_DIR
  59 #define GCC_INCLUDE_DIR "/usr/include"
  60
  61 #undef INCLUDE_DEFAULTS
  62 #define INCLUDE_DEFAULTS                                \
  63   {                                                     \
  64     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },             \
  65     { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1 },    \
  66     { GCC_INCLUDE_DIR, "GCC", 0, 0 },                   \
  67     { 0, 0, 0, 0 }                                      \
  68   }
  69
  70 /* Under NetBSD, the normal location of the compiler back ends is the
  71    /usr/libexec directory.  */
  72
  73 #undef STANDARD_EXEC_PREFIX
  74 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  75
  76 /* Under NetBSD, the normal location of the various *crt*.o files is the
  77    /usr/lib directory.  */
  78
  79 #undef STANDARD_STARTFILE_PREFIX
  80 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  81
  82 #undef TOOLDIR_BASE_PREFIX
  83 #define TOOLDIR_BASE_PREFIX             "/usr/"
  84
  85 #undef STANDARD_BINDIR_PREFIX
  86 #define STANDARD_BINDIR_PREFIX          "/usr/bin"
  87
  88 #undef STANDARD_LIBEXEC_PREFIX
  89 #define STANDARD_LIBEXEC_PREFIX         STANDARD_EXEC_PREFIX
  90
  91 #endif /* NETBSD_NATIVE */
  92
  93
  94 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  95
  96    1. Select the appropriate set of libs, depending on whether we're
  97       profiling.
  98
  99    2. Include the pthread library if -pthread is specified (only
 100       if threads are enabled).
 101
 102    3. Include the posix library if -posix is specified.
 103
 104    FIXME: Could eliminate the duplication here if we were allowed to
 105    use string concatenation.  */
 106
 107 #ifdef NETBSD_ENABLE_PTHREADS
 108 #define NETBSD_LIB_SPEC         \
 109   "%{pthread:                   \
 110      %{!p:                      \
 111        %{!pg:-lpthread}}        \
 112      %{p:-lpthread_p}           \
 113      %{pg:-lpthread_p}}         \
 114    %{posix:                     \
 115      %{!p:                      \
 116        %{!pg:-lposix}}          \
 117      %{p:-lposix_p}             \
 118      %{pg:-lposix_p}}           \
 119    %{shared:-lc}                \
 120    %{!shared:                   \
 121      %{!symbolic:               \
 122        %{!p:                    \
 123          %{!pg:-lc}}            \
 124        %{p:-lc_p}               \
 125        %{pg:-lc_p}}}"
 126 #else
 127 #define NETBSD_LIB_SPEC         \
 128   "%{posix:                     \
 129      %{!p:                      \
 130        %{!pg:-lposix}}          \
 131      %{p:-lposix_p}             \
 132      %{pg:-lposix_p}}           \
 133    %{shared:-lc}                \
 134    %{!shared:                   \
 135      %{!symbolic:               \
 136        %{!p:                    \
 137          %{!pg:-lc}}            \
 138        %{p:-lc_p}               \
 139        %{pg:-lc_p}}}"
 140 #endif
 141
 142 #undef LIB_SPEC
 143 #define LIB_SPEC NETBSD_LIB_SPEC
 144
 145 /* Don't provide a LIBGCC_SPEC for NetBSD as the default
 146    is correct. In the --disabled-shared case -lgcc is perfect.  */
 147
 148 #if defined(NETBSD_TOOLS) || defined(NETBSD_NATIVE)
 149 #define LIBGCC_PICSUFFIX        "_pic"
 150 #endif
 151
 152 /* Pass -cxx-isystem to cc1/cc1plus.  */
 153 #define NETBSD_CC1_AND_CC1PLUS_SPEC             \
 154   "%{cxx-isystem}"
 155
 156 #undef CC1_SPEC
 157 #define CC1_SPEC NETBSD_CC1_AND_CC1PLUS_SPEC
 158
 159 #undef CC1PLUS_SPEC
 160 #define CC1PLUS_SPEC NETBSD_CC1_AND_CC1PLUS_SPEC
 161
 162 /* When building shared libraries, the initialization and finalization
 163    functions for the library are .init and .fini respectively.  */
 164
 165 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 166   do {                                                                  \
 167     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 168     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 169   } while (0)
 170
 171 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 172   do {                                                                  \
 173     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 174     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 175   } while (0)
 176
 177 #undef TARGET_POSIX_IO
 178 #define TARGET_POSIX_IO
 179
 180 /* Handle #pragma weak and #pragma pack.  */
 181
 182 #define HANDLE_SYSV_PRAGMA 1
 183
 184 /* Don't assume anything about the header files.  */
 185 #undef  NO_IMPLICIT_EXTERN_C
 186 #define NO_IMPLICIT_EXTERN_C    1
 187
 188 /* Define some types that are the same on all NetBSD platforms,
 189    making them agree with <machine/ansi.h>.  */
 190
 191 #undef WCHAR_TYPE
 192 #define WCHAR_TYPE "int"
 193
 194 #undef WCHAR_TYPE_SIZE
 195 #define WCHAR_TYPE_SIZE 32
 196
 197 #undef WINT_TYPE
 198 #define WINT_TYPE "int"
 199 \f
 200
 201 /* Attempt to turn on execute permission for the stack.  This may be
 202    used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 203    if the target machine can change execute permissions on a page).
 204
 205    There is no way to query the execute permission of the stack, so
 206    we always issue the mprotect() call.
 207
 208    Note that we go out of our way to use namespace-non-invasive calls
 209    here.  Unfortunately, there is no libc-internal name for mprotect().
 210
 211    Also note that no errors should be emitted by this code; it is considered
 212    dangerous for library calls to send messages to stdout/stderr.  */
 213
 214 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 215 extern void __enable_execute_stack (void *);                            \
 216 void                                                                    \
 217 __enable_execute_stack (void *addr)                                     \
 218 {                                                                       \
 219   extern int mprotect (void *, size_t, int);                            \
 220   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 221                        void *, size_t);                                 \
 222                                                                         \
 223   static int size;                                                      \
 224   static long mask;                                                     \
 225                                                                         \
 226   char *page, *end;                                                     \
 227                                                                         \
 228   if (size == 0)                                                        \
 229     {                                                                   \
 230       int mib[2];                                                       \
 231       size_t len;                                                       \
 232                                                                         \
 233       mib[0] = 6; /* CTL_HW */                                          \
 234       mib[1] = 7; /* HW_PAGESIZE */                                     \
 235       len = sizeof (size);                                              \
 236       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 237       mask = ~((long) size - 1);                                        \
 238     }                                                                   \
 239                                                                         \
 240   page = (char *) (((long) addr) & mask);                               \
 241   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 242                                                                         \
 243   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 244   (void) mprotect (page, end - page, 7);                                \
 245 }