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.
  86
  87    3. Include the posix library if -posix is specified.  */
  88
  89 #undef LIB_SPEC
  90 #define 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
 108 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 109    libgcc with -symbolic.  */
 110
 111 #undef LIBGCC_SPEC
 112 #ifdef NETBSD_NATIVE
 113 #define LIBGCC_SPEC             \
 114   "%{!symbolic:                 \
 115      %{!shared:                 \
 116        %{!p:                    \
 117          %{!pg: -lgcc}}}                \
 118      %{shared: -lgcc_pic}       \
 119      %{p: -lgcc_p}              \
 120      %{pg: -lgcc_p}}"
 121 #else
 122 #define LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 123 #endif
 124
 125 /* When building shared libraries, the initialization and finalization
 126    functions for the library are .init and .fini respectively.  */
 127
 128 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 129   do {                                                                  \
 130     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 131     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 132   } while (0)
 133
 134 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 135   do {                                                                  \
 136     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 137     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 138   } while (0)
 139
 140 #undef TARGET_HAS_F_SETLKW
 141 #define TARGET_HAS_F_SETLKW
 142
 143 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 144
 145 #undef TARGET_MEM_FUNCTIONS
 146 #define TARGET_MEM_FUNCTIONS 1
 147
 148 /* Handle #pragma weak and #pragma pack.  */
 149
 150 #define HANDLE_SYSV_PRAGMA
 151
 152
 153 /* Define some types that are the same on all NetBSD platforms,
 154    making them agree with <machine/ansi.h>.  */
 155
 156 #undef WCHAR_TYPE
 157 #define WCHAR_TYPE "int"
 158
 159 #undef WCHAR_TYPE_SIZE
 160 #define WCHAR_TYPE_SIZE 32
 161
 162 #undef WINT_TYPE
 163 #define WINT_TYPE "int"
 164 \f
 165
 166 /* Attempt to turn on execute permission for the stack.  This may be
 167    used by TRANSFER_FROM_TRAMPOLINE of the target needs it (that is,
 168    if the target machine can change execute permissions on a page).
 169
 170    There is no way to query the execute permission of the stack, so
 171    we always issue the mprotect() call.
 172
 173    Note that we go out of our way to use namespace-non-invasive calls
 174    here.  Unfortunately, there is no libc-internal name for mprotect().
 175
 176    Also note that no errors should be emitted by this code; it is considered
 177    dangerous for library calls to send messages to stdout/stderr.  */
 178
 179 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 180 extern void __enable_execute_stack (void *);                            \
 181 void                                                                    \
 182 __enable_execute_stack (addr)                                           \
 183      void *addr;                                                        \
 184 {                                                                       \
 185   extern int mprotect (void *, size_t, int);                            \
 186   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 187                        void *, size_t);                                 \
 188                                                                         \
 189   static int size;                                                      \
 190   static long mask;                                                     \
 191                                                                         \
 192   char *page, *end;                                                     \
 193                                                                         \
 194   if (size == 0)                                                        \
 195     {                                                                   \
 196       int mib[2];                                                       \
 197       size_t len;                                                       \
 198                                                                         \
 199       mib[0] = 6; /* CTL_HW */                                          \
 200       mib[1] = 7; /* HW_PAGESIZE */                                     \
 201       len = sizeof (size);                                              \
 202       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 203       mask = ~((long) size - 1);                                        \
 204     }                                                                   \
 205                                                                         \
 206   page = (char *) (((long) addr) & mask);                               \
 207   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 208                                                                         \
 209   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 210   (void) mprotect (page, end - page, 7);                                \
 211 }