gcc/config/netbsd.h

   1 /* Base configuration file for all NetBSD targets.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3    2007, 2009, 2010 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* TARGET_OS_CPP_BUILTINS() common to all NetBSD targets.  */
  22 #define NETBSD_OS_CPP_BUILTINS_COMMON()         \
  23   do                                            \
  24     {                                           \
  25       builtin_define ("__NetBSD__");            \
  26       builtin_define ("__unix__");              \
  27       builtin_assert ("system=bsd");            \
  28       builtin_assert ("system=unix");           \
  29       builtin_assert ("system=NetBSD");         \
  30     }                                           \
  31   while (0)
  32
  33 /* CPP_SPEC parts common to all NetBSD targets.  */
  34 #define NETBSD_CPP_SPEC                         \
  35   "%{posix:-D_POSIX_SOURCE} \
  36    %{pthread:-D_REENTRANT -D_PTHREADS}"
  37
  38 /* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
  39    source tree so it can be configured appropriately without using
  40    the GNU configure/build mechanism.  */
  41
  42 #ifdef NETBSD_NATIVE
  43
  44 /* Look for the include files in the system-defined places.  */
  45
  46 #undef GPLUSPLUS_INCLUDE_DIR
  47 #define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
  48
  49 #undef GCC_INCLUDE_DIR
  50 #define GCC_INCLUDE_DIR "/usr/include"
  51
  52 #undef INCLUDE_DEFAULTS
  53 #define INCLUDE_DEFAULTS                        \
  54   {                                             \
  55     { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },     \
  56     { GCC_INCLUDE_DIR, "GCC", 0, 0 },           \
  57     { 0, 0, 0, 0 }                              \
  58   }
  59
  60 /* Under NetBSD, the normal location of the compiler back ends is the
  61    /usr/libexec directory.  */
  62
  63 #undef STANDARD_EXEC_PREFIX
  64 #define STANDARD_EXEC_PREFIX            "/usr/libexec/"
  65
  66 /* Under NetBSD, the normal location of the various *crt*.o files is the
  67    /usr/lib directory.  */
  68
  69 #undef STANDARD_STARTFILE_PREFIX
  70 #define STANDARD_STARTFILE_PREFIX       "/usr/lib/"
  71
  72 #endif /* NETBSD_NATIVE */
  73
  74
  75 /* Provide a LIB_SPEC appropriate for NetBSD.  Here we:
  76
  77    1. Select the appropriate set of libs, depending on whether we're
  78       profiling.
  79
  80    2. Include the pthread library if -pthread is specified (only
  81       if threads are enabled).
  82
  83    3. Include the posix library if -posix is specified.
  84
  85    FIXME: Could eliminate the duplication here if we were allowed to
  86    use string concatenation.  */
  87
  88 #ifdef NETBSD_ENABLE_PTHREADS
  89 #define NETBSD_LIB_SPEC         \
  90   "%{pthread:                   \
  91      %{!p:                      \
  92        %{!pg:-lpthread}}        \
  93      %{p:-lpthread_p}           \
  94      %{pg:-lpthread_p}}         \
  95    %{posix:                     \
  96      %{!p:                      \
  97        %{!pg:-lposix}}          \
  98      %{p:-lposix_p}             \
  99      %{pg:-lposix_p}}           \
 100    %{!shared:                   \
 101      %{!symbolic:               \
 102        %{!p:                    \
 103          %{!pg:-lc}}            \
 104        %{p:-lc_p}               \
 105        %{pg:-lc_p}}}"
 106 #else
 107 #define NETBSD_LIB_SPEC         \
 108   "%{posix:                     \
 109      %{!p:                      \
 110        %{!pg:-lposix}}          \
 111      %{p:-lposix_p}             \
 112      %{pg:-lposix_p}}           \
 113    %{!shared:                   \
 114      %{!symbolic:               \
 115        %{!p:                    \
 116          %{!pg:-lc}}            \
 117        %{p:-lc_p}               \
 118        %{pg:-lc_p}}}"
 119 #endif
 120
 121 #undef LIB_SPEC
 122 #define LIB_SPEC NETBSD_LIB_SPEC
 123
 124 /* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
 125    libgcc with -symbolic.  */
 126
 127 #ifdef NETBSD_NATIVE
 128 #define NETBSD_LIBGCC_SPEC      \
 129   "%{!symbolic:                 \
 130      %{!shared:                 \
 131        %{!p:                    \
 132          %{!pg: -lgcc}}}        \
 133      %{shared: -lgcc_pic}       \
 134      %{p: -lgcc_p}              \
 135      %{pg: -lgcc_p}}"
 136 #else
 137 #define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
 138 #endif
 139
 140 #undef LIBGCC_SPEC
 141 #define LIBGCC_SPEC NETBSD_LIBGCC_SPEC
 142
 143 /* When building shared libraries, the initialization and finalization
 144    functions for the library are .init and .fini respectively.  */
 145
 146 #define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)                           \
 147   do {                                                                  \
 148     fprintf ((STREAM), "void __init() __asm__ (\".init\");");           \
 149     fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));        \
 150   } while (0)
 151
 152 #define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)                           \
 153   do {                                                                  \
 154     fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");           \
 155     fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));        \
 156   } while (0)
 157
 158 #undef TARGET_POSIX_IO
 159 #define TARGET_POSIX_IO
 160
 161 /* Don't assume anything about the header files.  */
 162 #undef  NO_IMPLICIT_EXTERN_C
 163 #define NO_IMPLICIT_EXTERN_C    1
 164
 165 /* Define some types that are the same on all NetBSD platforms,
 166    making them agree with <machine/ansi.h>.  */
 167
 168 #undef WCHAR_TYPE
 169 #define WCHAR_TYPE "int"
 170
 171 #undef WCHAR_TYPE_SIZE
 172 #define WCHAR_TYPE_SIZE 32
 173
 174 #undef WINT_TYPE
 175 #define WINT_TYPE "int"
 176 \f
 177
 178 /* Attempt to turn on execute permission for the stack.  This may be
 179    used by TARGET_TRAMPOLINE_INIT if the target needs it (that is,
 180    if the target machine can change execute permissions on a page).
 181
 182    There is no way to query the execute permission of the stack, so
 183    we always issue the mprotect() call.
 184
 185    Note that we go out of our way to use namespace-non-invasive calls
 186    here.  Unfortunately, there is no libc-internal name for mprotect().
 187
 188    Also note that no errors should be emitted by this code; it is considered
 189    dangerous for library calls to send messages to stdout/stderr.  */
 190
 191 #define NETBSD_ENABLE_EXECUTE_STACK                                     \
 192 extern void __enable_execute_stack (void *);                            \
 193 void                                                                    \
 194 __enable_execute_stack (void *addr)                                     \
 195 {                                                                       \
 196   extern int mprotect (void *, size_t, int);                            \
 197   extern int __sysctl (int *, unsigned int, void *, size_t *,           \
 198                        void *, size_t);                                 \
 199                                                                         \
 200   static int size;                                                      \
 201   static long mask;                                                     \
 202                                                                         \
 203   char *page, *end;                                                     \
 204                                                                         \
 205   if (size == 0)                                                        \
 206     {                                                                   \
 207       int mib[2];                                                       \
 208       size_t len;                                                       \
 209                                                                         \
 210       mib[0] = 6; /* CTL_HW */                                          \
 211       mib[1] = 7; /* HW_PAGESIZE */                                     \
 212       len = sizeof (size);                                              \
 213       (void) __sysctl (mib, 2, &size, &len, NULL, 0);                   \
 214       mask = ~((long) size - 1);                                        \
 215     }                                                                   \
 216                                                                         \
 217   page = (char *) (((long) addr) & mask);                               \
 218   end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);  \
 219                                                                         \
 220   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                         \
 221   (void) mprotect (page, end - page, 7);                                \
 222 }