gcc/config/netbsd.h

   1 /* Base configuration file for all NetBSD targets.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, 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_assert ("system=unix");           \
  28       builtin_assert ("system=NetBSD");         \
  29     }                                           \
  30   while (0)
  31
  32 /* CPP_SPEC parts common to all NetBSD targets.  */
  33 #define NETBSD_CPP_SPEC                         \
  34   "%{posix:-D_POSIX_SOURCE} \
  35    %{pthread:-D_REENTRANT -D_PTHREADS}"
  36
  37 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  38    source tree so it can be configured appropriately without using
  39    the GNU configure/build mechanism.  */
  40
  41 #ifdef NETBSD_NATIVE
  42
  43 /* Look for the include files in the system-defined places.  */
  44
  45 #undef GPLUSPLUS_INCLUDE_DIR
  46 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  47
  48 #undef GCC_INCLUDE_DIR
  49 #define GCC_INCLUDE_DIR "/usr/include"
  50
  51 #undef INCLUDE_DEFAULTS
  52 #define INCLUDE_DEFAULTS                        \
  53   {                                             \
  54     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },     \
  55     { GCC_INCLUDE_DIR, "GCC", 0, 0 },           \
  56     { 0, 0, 0, 0 }                              \
  57   }
  58
  59 /* Under NetBSD, the normal location of the compiler back ends is the
  60    /usr/libexec directory.  */
  61
  62 #undef STANDARD_EXEC_PREFIX
  63 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  64
  65 /* Under NetBSD, the normal location of the various *crt*.o files is the
  66    /usr/lib directory.  */
  67
  68 #undef STANDARD_STARTFILE_PREFIX
  69 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  70
  71 #endif /* NETBSD_NATIVE */
  72
  73
  74 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  75
  76    1. Select the appropriate set of libs, depending on whether we're
  77       profiling.
  78
  79    2. Include the pthread library if -pthread is specified (only
  80       if threads are enabled).
  81
  82    3. Include the posix library if -posix is specified.
  83
  84    FIXME: Could eliminate the duplication here if we were allowed to
  85    use string concatenation.  */
  86
  87 #ifdef NETBSD_ENABLE_PTHREADS
  88 #define NETBSD_LIB_SPEC         \
  89   "%{pthread:                   \
  90      %{!p:                      \
  91        %{!pg:-lpthread}}        \
  92      %{p:-lpthread_p}           \
  93      %{pg:-lpthread_p}}         \
  94    %{posix:                     \
  95      %{!p:                      \
  96        %{!pg:-lposix}}          \
  97      %{p:-lposix_p}             \
  98      %{pg:-lposix_p}}           \
  99    %{!shared:                   \
 100      %{!symbolic:               \
 101        %{!p:                    \
 102          %{!pg:-lc}}            \
 103        %{p:-lc_p}               \
 104        %{pg:-lc_p}}}"
 105 #else
 106 #define NETBSD_LIB_SPEC         \
 107   "%{posix:                     \
 108      %{!p:                      \
 109        %{!pg:-lposix}}          \
 110      %{p:-lposix_p}             \
 111      %{pg:-lposix_p}}           \
 112    %{!shared:                   \
 113      %{!symbolic:               \
 114        %{!p:                    \
 115          %{!pg:-lc}}            \
 116        %{p:-lc_p}               \
 117        %{pg:-lc_p}}}"
 118 #endif
 119
 120 #undef LIB_SPEC
 121 #define LIB_SPEC NETBSD_LIB_SPEC
 122
 123 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 124    libgcc with -symbolic.  */
 125
 126 #ifdef NETBSD_NATIVE
 127 #define NETBSD_LIBGCC_SPEC      \
 128   "%{!symbolic:                 \
 129      %{!shared:                 \
 130        %{!p:                    \
 131          %{!pg: -lgcc}}}        \
 132      %{shared: -lgcc_pic}       \
 133      %{p: -lgcc_p}              \
 134      %{pg: -lgcc_p}}"
 135 #else
 136 #define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 137 #endif
 138
 139 #undef LIBGCC_SPEC
 140 #define LIBGCC_SPEC NETBSD_LIBGCC_SPEC
 141
 142 /* When building shared libraries, the initialization and finalization
 143    functions for the library are .init and .fini respectively.  */
 144
 145 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 146   do {                                                                  \
 147     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 148     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 149   } while (0)
 150
 151 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 152   do {                                                                  \
 153     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 154     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 155   } while (0)
 156
 157 #undef TARGET_HAS_F_SETLKW
 158 #define TARGET_HAS_F_SETLKW
 159
 160 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 161
 162 #undef TARGET_MEM_FUNCTIONS
 163 #define TARGET_MEM_FUNCTIONS 1
 164
 165 /* Handle #pragma weak and #pragma pack.  */
 166
 167 #define HANDLE_SYSV_PRAGMA 1
 168
 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 TRANSFER_FROM_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 (addr)                                           \
 200      void *addr;                                                        \
 201 {                                                                       \
 202   extern int mprotect (void *, size_t, int);                            \
 203   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 204                        void *, size_t);                                 \
 205                                                                         \
 206   static int size;                                                      \
 207   static long mask;                                                     \
 208                                                                         \
 209   char *page, *end;                                                     \
 210                                                                         \
 211   if (size == 0)                                                        \
 212     {                                                                   \
 213       int mib[2];                                                       \
 214       size_t len;                                                       \
 215                                                                         \
 216       mib[0] = 6; /* CTL_HW */                                          \
 217       mib[1] = 7; /* HW_PAGESIZE */                                     \
 218       len = sizeof (size);                                              \
 219       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 220       mask = ~((long) size - 1);                                        \
 221     }                                                                   \
 222                                                                         \
 223   page = (char *) (((long) addr) & mask);                               \
 224   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 225                                                                         \
 226   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 227   (void) mprotect (page, end - page, 7);                                \
 228 }