gcc/config/netbsd.h

   1 /* Base configuration file for all NetBSD targets.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
   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 /* TARGET_OS_CPP_BUILTINS() common to all LP64 NetBSD targets.  */
  33 #define NETBSD_OS_CPP_BUILTINS_LP64()           \
  34   do                                            \
  35     {                                           \
  36       builtin_define ("_LP64");                 \
  37     }                                           \
  38   while (0)
  39
  40 /* CPP_SPEC parts common to all NetBSD targets.  */
  41 #define NETBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
  42
  43 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  44    source tree so it can be configured appropriately without using
  45    the GNU configure/build mechanism.  */
  46
  47 #ifdef NETBSD_NATIVE
  48
  49 /* Look for the include files in the system-defined places.  */
  50
  51 #undef GPLUSPLUS_INCLUDE_DIR
  52 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  53
  54 #undef GCC_INCLUDE_DIR
  55 #define GCC_INCLUDE_DIR "/usr/include"
  56
  57 #undef INCLUDE_DEFAULTS
  58 #define INCLUDE_DEFAULTS                        \
  59   {                                             \
  60     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },     \
  61     { GCC_INCLUDE_DIR, "GCC", 0, 0 },           \
  62     { 0, 0, 0, 0 }                              \
  63   }
  64
  65 /* Under NetBSD, the normal location of the compiler back ends is the
  66    /usr/libexec directory.  */
  67
  68 #undef STANDARD_EXEC_PREFIX
  69 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  70
  71 /* Under NetBSD, the normal location of the various *crt*.o files is the
  72    /usr/lib directory.  */
  73
  74 #undef STANDARD_STARTFILE_PREFIX
  75 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  76
  77 #endif /* NETBSD_NATIVE */
  78
  79
  80 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  81
  82    1. Select the appropriate set of libs, depending on whether we're
  83       profiling.
  84
  85    2. Include the pthread library if -pthread is specified (only
  86       if threads are enabled).
  87
  88    3. Include the posix library if -posix is specified.
  89
  90    FIXME: Could eliminate the duplication here if we were allowed to
  91    use string concatenation.  */
  92
  93 #ifdef NETBSD_ENABLE_PTHREADS
  94 #define NETBSD_LIB_SPEC         \
  95   "%{pthread:                   \
  96      %{!p:                      \
  97        %{!pg:-lpthread}}        \
  98      %{p:-lpthread_p}           \
  99      %{pg:-lpthread_p}}         \
 100    %{posix:                     \
 101      %{!p:                      \
 102        %{!pg:-lposix}}          \
 103      %{p:-lposix_p}             \
 104      %{pg:-lposix_p}}           \
 105    %{!shared:                   \
 106      %{!symbolic:               \
 107        %{!p:                    \
 108          %{!pg:-lc}}            \
 109        %{p:-lc_p}               \
 110        %{pg:-lc_p}}}"
 111 #else
 112 #define NETBSD_LIB_SPEC         \
 113   "%{posix:                     \
 114      %{!p:                      \
 115        %{!pg:-lposix}}          \
 116      %{p:-lposix_p}             \
 117      %{pg:-lposix_p}}           \
 118    %{!shared:                   \
 119      %{!symbolic:               \
 120        %{!p:                    \
 121          %{!pg:-lc}}            \
 122        %{p:-lc_p}               \
 123        %{pg:-lc_p}}}"
 124 #endif
 125
 126 #undef LIB_SPEC
 127 #define LIB_SPEC NETBSD_LIB_SPEC
 128
 129 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 130    libgcc with -symbolic.  */
 131
 132 #ifdef NETBSD_NATIVE
 133 #define NETBSD_LIBGCC_SPEC      \
 134   "%{!symbolic:                 \
 135      %{!shared:                 \
 136        %{!p:                    \
 137          %{!pg: -lgcc}}}        \
 138      %{shared: -lgcc_pic}       \
 139      %{p: -lgcc_p}              \
 140      %{pg: -lgcc_p}}"
 141 #else
 142 #define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 143 #endif
 144
 145 #undef LIBGCC_SPEC
 146 #define LIBGCC_SPEC NETBSD_LIBGCC_SPEC
 147
 148 /* When building shared libraries, the initialization and finalization
 149    functions for the library are .init and .fini respectively.  */
 150
 151 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 152   do {                                                                  \
 153     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 154     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 155   } while (0)
 156
 157 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 158   do {                                                                  \
 159     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 160     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 161   } while (0)
 162
 163 #undef TARGET_HAS_F_SETLKW
 164 #define TARGET_HAS_F_SETLKW
 165
 166 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 167
 168 #undef TARGET_MEM_FUNCTIONS
 169 #define TARGET_MEM_FUNCTIONS 1
 170
 171 /* Handle #pragma weak and #pragma pack.  */
 172
 173 #define HANDLE_SYSV_PRAGMA 1
 174
 175
 176 /* Define some types that are the same on all NetBSD platforms,
 177    making them agree with <machine/ansi.h>.  */
 178
 179 #undef WCHAR_TYPE
 180 #define WCHAR_TYPE "int"
 181
 182 #undef WCHAR_TYPE_SIZE
 183 #define WCHAR_TYPE_SIZE 32
 184
 185 #undef WINT_TYPE
 186 #define WINT_TYPE "int"
 187 \f
 188
 189 /* Attempt to turn on execute permission for the stack.  This may be
 190    used by TRANSFER_FROM_TRAMPOLINE of the target needs it (that is,
 191    if the target machine can change execute permissions on a page).
 192
 193    There is no way to query the execute permission of the stack, so
 194    we always issue the mprotect() call.
 195
 196    Note that we go out of our way to use namespace-non-invasive calls
 197    here.  Unfortunately, there is no libc-internal name for mprotect().
 198
 199    Also note that no errors should be emitted by this code; it is considered
 200    dangerous for library calls to send messages to stdout/stderr.  */
 201
 202 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 203 extern void __enable_execute_stack (void *);                            \
 204 void                                                                    \
 205 __enable_execute_stack (addr)                                           \
 206      void *addr;                                                        \
 207 {                                                                       \
 208   extern int mprotect (void *, size_t, int);                            \
 209   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 210                        void *, size_t);                                 \
 211                                                                         \
 212   static int size;                                                      \
 213   static long mask;                                                     \
 214                                                                         \
 215   char *page, *end;                                                     \
 216                                                                         \
 217   if (size == 0)                                                        \
 218     {                                                                   \
 219       int mib[2];                                                       \
 220       size_t len;                                                       \
 221                                                                         \
 222       mib[0] = 6; /* CTL_HW */                                          \
 223       mib[1] = 7; /* HW_PAGESIZE */                                     \
 224       len = sizeof (size);                                              \
 225       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 226       mask = ~((long) size - 1);                                        \
 227     }                                                                   \
 228                                                                         \
 229   page = (char *) (((long) addr) & mask);                               \
 230   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 231                                                                         \
 232   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 233   (void) mprotect (page, end - page, 7);                                \
 234 }