freebsd-dev/contrib/gcc/config/netbsd.h

/* Base configuration file for all NetBSD targets.
   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* TARGET_OS_CPP_BUILTINS() common to all NetBSD targets.  */
#define NETBSD_OS_CPP_BUILTINS_COMMON()		\
  do						\
    {						\
      builtin_define ("__NetBSD__");		\
      builtin_assert ("system=unix");		\
      builtin_assert ("system=NetBSD");		\
    }						\
  while (0)

/* CPP_SPEC parts common to all NetBSD targets.  */
#define NETBSD_CPP_SPEC				\
  "%{posix:-D_POSIX_SOURCE} \
   %{pthread:-D_REENTRANT -D_PTHREADS}"

/* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
   source tree so it can be configured appropriately without using
   the GNU configure/build mechanism.  */

#ifdef NETBSD_NATIVE

/* Look for the include files in the system-defined places.  */

#undef GPLUSPLUS_INCLUDE_DIR
#define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"

#undef GCC_INCLUDE_DIR
#define GCC_INCLUDE_DIR "/usr/include"

#undef INCLUDE_DEFAULTS
#define INCLUDE_DEFAULTS			\
  {						\
    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },	\
    { GCC_INCLUDE_DIR, "GCC", 0, 0 },		\
    { 0, 0, 0, 0 }				\
  }

/* Under NetBSD, the normal location of the compiler back ends is the
   /usr/libexec directory.  */

#undef STANDARD_EXEC_PREFIX
#define STANDARD_EXEC_PREFIX		"/usr/libexec/"

/* Under NetBSD, the normal location of the various *crt*.o files is the
   /usr/lib directory.  */

#undef STANDARD_STARTFILE_PREFIX
#define STANDARD_STARTFILE_PREFIX	"/usr/lib/"

#endif /* NETBSD_NATIVE */


/* Provide a LIB_SPEC appropriate for NetBSD.  Here we:

   1. Select the appropriate set of libs, depending on whether we're
      profiling.

   2. Include the pthread library if -pthread is specified (only
      if threads are enabled).

   3. Include the posix library if -posix is specified.

   FIXME: Could eliminate the duplication here if we were allowed to
   use string concatenation.  */

#ifdef NETBSD_ENABLE_PTHREADS
#define NETBSD_LIB_SPEC		\
  "%{pthread:			\
     %{!p:			\
       %{!pg:-lpthread}}	\
     %{p:-lpthread_p}		\
     %{pg:-lpthread_p}}		\
   %{posix:			\
     %{!p:			\
       %{!pg:-lposix}}		\
     %{p:-lposix_p}		\
     %{pg:-lposix_p}}		\
   %{!shared:			\
     %{!symbolic:		\
       %{!p:			\
	 %{!pg:-lc}}		\
       %{p:-lc_p}		\
       %{pg:-lc_p}}}"
#else
#define NETBSD_LIB_SPEC		\
  "%{posix:			\
     %{!p:			\
       %{!pg:-lposix}}		\
     %{p:-lposix_p}		\
     %{pg:-lposix_p}}		\
   %{!shared:			\
     %{!symbolic:		\
       %{!p:			\
	 %{!pg:-lc}}		\
       %{p:-lc_p}		\
       %{pg:-lc_p}}}"
#endif

#undef LIB_SPEC
#define LIB_SPEC NETBSD_LIB_SPEC

/* Provide a LIBGCC_SPEC appropriate for NetBSD.  We also want to exclude
   libgcc with -symbolic.  */

#ifdef NETBSD_NATIVE
#define NETBSD_LIBGCC_SPEC	\
  "%{!symbolic:			\
     %{!shared:			\
       %{!p:			\
	 %{!pg: -lgcc}}}	\
     %{shared: -lgcc_pic}	\
     %{p: -lgcc_p}		\
     %{pg: -lgcc_p}}"
#else
#define NETBSD_LIBGCC_SPEC "%{!shared:%{!symbolic: -lgcc}}"
#endif

#undef LIBGCC_SPEC
#define LIBGCC_SPEC NETBSD_LIBGCC_SPEC

/* When building shared libraries, the initialization and finalization 
   functions for the library are .init and .fini respectively.  */

#define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)				\
  do {									\
    fprintf ((STREAM), "void __init() __asm__ (\".init\");");		\
    fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));	\
  } while (0)

#define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)				\
  do {									\
    fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");		\
    fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));	\
  } while (0)

#undef TARGET_HAS_F_SETLKW
#define TARGET_HAS_F_SETLKW

/* Implicit library calls should use memcpy, not bcopy, etc.  */

#undef TARGET_MEM_FUNCTIONS
#define TARGET_MEM_FUNCTIONS 1

/* Handle #pragma weak and #pragma pack.  */

#define HANDLE_SYSV_PRAGMA 1


/* Define some types that are the same on all NetBSD platforms,
   making them agree with <machine/ansi.h>.  */

#undef WCHAR_TYPE
#define WCHAR_TYPE "int"

#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32

#undef WINT_TYPE
#define WINT_TYPE "int"


/* Attempt to turn on execute permission for the stack.  This may be
   used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
   if the target machine can change execute permissions on a page).

   There is no way to query the execute permission of the stack, so
   we always issue the mprotect() call.

   Note that we go out of our way to use namespace-non-invasive calls
   here.  Unfortunately, there is no libc-internal name for mprotect().

   Also note that no errors should be emitted by this code; it is considered
   dangerous for library calls to send messages to stdout/stderr.  */

#define NETBSD_ENABLE_EXECUTE_STACK					\
extern void __enable_execute_stack (void *);				\
void									\
__enable_execute_stack (void *addr)					\
{									\
  extern int mprotect (void *, size_t, int);				\
  extern int __sysctl (int *, unsigned int, void *, size_t *,		\
		       void *, size_t);					\
									\
  static int size;							\
  static long mask;							\
									\
  char *page, *end;							\
									\
  if (size == 0)							\
    {									\
      int mib[2];							\
      size_t len;							\
									\
      mib[0] = 6; /* CTL_HW */						\
      mib[1] = 7; /* HW_PAGESIZE */					\
      len = sizeof (size);						\
      (void) __sysctl (mib, 2, &size, &len, NULL, 0);			\
      mask = ~((long) size - 1);					\
    }									\
									\
  page = (char *) (((long) addr) & mask);				\
  end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size);	\
									\
  /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */				\
  (void) mprotect (page, end - page, 7);				\
}