/* Definitions for Intel 386 running FreeBSD with ELF format
   Copyright (C) 1996, 2000, 2002, 2004, 2007, 2010
   Free Software Foundation, Inc.
   Contributed by Eric Youngdale.
   Modified for stabs-in-ELF by H.J. Lu.
   Adapted from GNU/Linux version by John Polstra.
   Continued development by David O'Brien <obrien@freebsd.org>
   Copyright (C) 2010, 2011 John Marino <www.dragonlace.net>

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 3, 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 COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */


#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)");

/* Override the default comment-starter of "/".  */
#undef  ASM_COMMENT_START
#define ASM_COMMENT_START "#"

#undef  ASM_APP_ON
#define ASM_APP_ON "#APP\n"

#undef  ASM_APP_OFF
#define ASM_APP_OFF "#NO_APP\n"

#undef  DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) \
  (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])

#undef  NO_PROFILE_COUNTERS
#define NO_PROFILE_COUNTERS	1

/* Tell final.c that we don't need a label passed to mcount.  */

#undef  MCOUNT_NAME
#define MCOUNT_NAME ".mcount"

/* Make gcc agree with <machine/ansi.h>.  */

#undef  SIZE_TYPE
#define SIZE_TYPE	(TARGET_64BIT ? "long unsigned int" : "unsigned int")

#undef  PTRDIFF_TYPE
#define PTRDIFF_TYPE	(TARGET_64BIT ? "long int" : "int")

#undef  WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE	(TARGET_64BIT ? 32 : BITS_PER_WORD)

#undef  SUBTARGET_EXTRA_SPECS	/* i386.h bogusly defines it.  */
#define SUBTARGET_EXTRA_SPECS \
  { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }

/* Provide a STARTFILE_SPEC appropriate for FreeBSD.  Here we add
   the magical crtbegin.o file (see crtstuff.c) which provides part
	of the support for getting C++ file-scope static object constructed
	before entering `main'.  */

#undef	STARTFILE_SPEC
#define STARTFILE_SPEC \
  "%{!shared: \
     %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
		       %{!p:%{profile:gcrt1.o%s} \
			 %{!profile:crt1.o%s}}}} \
   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"

/* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
   the magical crtend.o file (see crtstuff.c) which provides part of
	the support for getting C++ file-scope static object constructed
	before entering `main', followed by a normal "finalizer" file,
	`crtn.o'.  */

#undef	ENDFILE_SPEC
#define ENDFILE_SPEC \
  "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"

/* Provide a LINK_SPEC appropriate for FreeBSD.  Here we provide support
   for the special GCC options -static and -shared, which allow us to
   link things in one of these three modes by applying the appropriate
   combinations of options at link-time.

   When the -shared link option is used a final link is not being
   done.  */

#undef	LINK_SPEC
#define LINK_SPEC "\
  %{p:%nconsider using '-pg' instead of '-p' with gprof(1)} \
  %{v:-V} \
  %{assert*} %{R*} %{rpath*} %{defsym*} \
  %{shared:-Bshareable %{h*} %{soname*}} \
    %{!shared: \
      %{!static: \
        %{rdynamic:-export-dynamic} \
        -dynamic-linker %(fbsd_dynamic_linker) } \
    %{static:-Bstatic}} \
  %{symbolic:-Bsymbolic}"

/* A C statement to output to the stdio stream FILE an assembler
   command to advance the location counter to a multiple of 1<<LOG
   bytes if it is within MAX_SKIP bytes.

   This is used to align code labels according to Intel recommendations.  */

#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
#undef  ASM_OUTPUT_MAX_SKIP_ALIGN
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP)					\
  if ((LOG) != 0) {														\
    if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));	\
    else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));	\
  }
#endif

/* Don't default to pcc-struct-return, we want to retain compatibility with
   older gcc versions AND pcc-struct-return is nonreentrant.
   (even though the SVR4 ABI for the i386 says that records and unions are
   returned in memory).  */

#undef  DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 0

/* FreeBSD sets the rounding precision of the FPU to 53 bits, but GNAT
   resets it to full precision.  */
#undef TARGET_96_ROUND_53_LONG_DOUBLE
#define TARGET_96_ROUND_53_LONG_DOUBLE 0

/* Put all *tf routines in libgcc.  */
#undef LIBGCC2_HAS_TF_MODE
#define LIBGCC2_HAS_TF_MODE 1
#define LIBGCC2_TF_CEXT q
#define TF_SIZE 113

/* Static stack checking is supported by means of probes.  */
#define STACK_CHECK_STATIC_BUILTIN 1

/* Support for i386 has been removed from FreeBSD 6.0 onward.  */
#if FBSD_MAJOR >= 6
#define SUBTARGET32_DEFAULT_CPU "i486"
#endif

/* Define location of OS-specific unwind support configuration. */
#define MD_UNWIND_SUPPORT "config/i386/freebsd-unwind.h"

/* Through FreeBSD 8.2 at least, stack is denied execution rights by libthr
   This only affects AMD64 since i386 ignores the nx bit (non-PAE)
   However, it's still included in i386 because it's possible an AMD64
   machine will be required to run a binary generated by i386 GNAT.
   perms = PROT_READ | PROT_WRITE | PROT_EXEC;
*/
#define ENABLE_EXECUTE_STACK                             \
extern void __enable_execute_stack (void *);             \
void                                                     \
__enable_execute_stack (void *addr)                      \
{                                                        \
  extern int getpagesize (void);                         \
  extern int mprotect (void *, size_t, int);             \
                                                         \
  static int size;                                       \
  long mask;                                             \
  char *page, *ends;                                     \
  long page_addr = (long) addr;                          \
  long ends_addr = (long) (addr + TRAMPOLINE_SIZE);      \
  int  perms     = 7;                                    \
                                                         \
  if (size == 0)                                         \
  {                                                      \
    size = getpagesize();                                \
  }                                                      \
  mask = ~((long) size - 1);                             \
  page = (char *)  (page_addr & mask);                   \
  ends = (char *) ((ends_addr & mask) + size);           \
  (void) mprotect (page, ends - page, perms);            \
}


