Add --enable-default-pie option to GCC configure

[thirdparty/gcc.git] / gcc / config / m68k / netbsd-elf.h

/* Definitions of target machine for GNU compiler,
   for m68k (including m68010) NetBSD platforms using the
   ELF object format.
   Copyright (C) 2002-2015 Free Software Foundation, Inc.
   Contributed by Wasabi Systems. Inc.

   This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
   and <m68k/linux.h>.

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_OS_CPP_BUILTINS()		\
  do						\
    {						\
      NETBSD_OS_CPP_BUILTINS_ELF();		\
      builtin_define ("__m68k__");		\
      builtin_define ("__SVR4_ABI__");		\
      builtin_define ("__motorola__");		\
      if (TARGET_HARD_FLOAT)			\
	builtin_define ("__HAVE_FPU__");	\
    }						\
  while (0)

/* Don't try using XFmode on the 68010.  */ 
#undef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)

#undef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS \
  { "netbsd_entry_point",   NETBSD_ENTRY_POINT },


/* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
   deal with the GCC option '-posix', as well as an indication as to
   whether or not use of the FPU is allowed.  */

#undef CPP_SPEC
#define CPP_SPEC NETBSD_CPP_SPEC


/* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We need
   to pass PIC code generation options.  */

#undef ASM_SPEC
#define ASM_SPEC \
  "%(asm_cpu_spec) %{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"

/* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */

#undef LINK_SPEC
#define LINK_SPEC NETBSD_LINK_SPEC_ELF

#define NETBSD_ENTRY_POINT "_start"

/* Output assembler code to FILE to increment profiler label # LABELNO
   for profiling a function only.  */

#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO)				\
do									\
  {									\
    asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));	\
    if (flag_pic)							\
      fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");			\
    else								\
      fprintf (FILE, "\tjbsr __mcount\n");				\
  }									\
while (0)


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

#undef SIZE_TYPE
#define SIZE_TYPE "unsigned int"

#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE "int"


/* XXX
   Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
   file directly, because it has a lot of baggage we don't want.  */


/* The prefix for register names.  Note that REGISTER_NAMES
   is supposed to include this prefix.  Also note that this is NOT an
   fprintf format string, it is a literal string.  */

#undef REGISTER_PREFIX
#define REGISTER_PREFIX "%"


/* The prefix for local (compiler generated) lables.
   These labels will not appear in the symbol table.  */

#undef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX "."


/* The prefix to add to user-visible assembler symbols.  */

#undef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""


#undef ASM_COMMENT_START
#define ASM_COMMENT_START "|"


/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
   keep switch tables in the text section.  */

#undef JUMP_TABLES_IN_TEXT_SECTION
#define JUMP_TABLES_IN_TEXT_SECTION 1


/* Use the default action for outputting the case label.  */
#undef ASM_OUTPUT_CASE_LABEL
#define ASM_RETURN_CASE_JUMP				\
  do {							\
    if (TARGET_COLDFIRE)				\
      {							\
	if (ADDRESS_REG_P (operands[0]))		\
	  return "jmp %%pc@(2,%0:l)";			\
	else						\
	  return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";	\
      }							\
    else						\
      return "jmp %%pc@(2,%0:w)";			\
  } while (0)


/* This is how to output an assembler line that says to advance the
   location counter to a multiple of 2**LOG bytes.  */

#undef ASM_OUTPUT_ALIGN
#define ASM_OUTPUT_ALIGN(FILE,LOG)					\
do									\
  {									\
    if ((LOG) > 0)							\
      fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));		\
  }									\
while (0)


/* If defined, a C expression whose value is a string containing the
   assembler operation to identify the following data as uninitialized global
   data.  */

#define BSS_SECTION_ASM_OP	".section\t.bss"


#undef ASM_OUTPUT_ALIGNED_BSS
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)		\
  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)


#undef ASM_OUTPUT_COMMON
#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)			\
( fputs (".comm ", (FILE)),						\
  assemble_name ((FILE), (NAME)),					\
  fprintf ((FILE), ",%u\n", (int)(SIZE)))

#undef ASM_OUTPUT_LOCAL
#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)			\
( fputs (".lcomm ", (FILE)),						\
  assemble_name ((FILE), (NAME)),					\
  fprintf ((FILE), ",%u\n", (int)(SIZE)))


/* XXX
   This is the end of the chunk lifted from m68kelf.h  */


/* XXX
   The following chunk is more or less lifted from m68kv4.h.
   We'd like to just #include that file, but it has not yet
   been converted to the new include style.

   Should there be a m68kv4-abi.h ??  */


/* Register in which address to store a structure value is passed to a
   function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */

#undef M68K_STRUCT_VALUE_REGNUM
#define M68K_STRUCT_VALUE_REGNUM A0_REG


/* Register in which static-chain is passed to a function.  The
   default isn m68k.h is a0, but that is already the struct value
   regnum.  Make it a1 instead.  */

#undef STATIC_CHAIN_REGNUM
#define STATIC_CHAIN_REGNUM A1_REG
#undef M68K_STATIC_CHAIN_REG_NAME
#define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"


/* Now to renumber registers for dbx and gdb.
   We use the Sun-3 convention, which is:
   floating point registers have numbers 18 to 25, not
   16 to 23 as they do in the compiler.  */

#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)


/* 1 if N is a possible register number for a function value.  For
   m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
   pointer, or floating types, respectively.  Reject fp0 if not using
   a 68881 coprocessor.  */

#undef FUNCTION_VALUE_REGNO_P
#define FUNCTION_VALUE_REGNO_P(N)					\
  ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))


/* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
   more than one register.  */

#undef NEEDS_UNTYPED_CALL
#define NEEDS_UNTYPED_CALL 1


/* Define how to generate (in the callee) the output value of a
   function and how to find (in the caller) the value returned by a
   function.  VALTYPE is the data type of the value (as a tree).  If
   the precise function being called is known, FUNC is its
   FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
   result in d0, a0, or fp0 as appropriate.  */

#undef FUNCTION_VALUE
#define FUNCTION_VALUE(VALTYPE, FUNC)					\
  m68k_function_value (VALTYPE, FUNC)


/* Define how to find the value returned by a library function
   assuming the value has mode MODE.
   For m68k/SVR4 look for integer values in d0, pointer values in d0
   (returned in both d0 and a0), and floating values in fp0.  */

#undef LIBCALL_VALUE
#define LIBCALL_VALUE(MODE)						\
  m68k_libcall_value (MODE)


/* Boundary (in *bits*) on which stack pointer should be aligned.
   The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */

#undef STACK_BOUNDARY
#define STACK_BOUNDARY 32


/* Alignment of field after `int : 0' in a structure.
   For m68k/SVR4, this is the next longword boundary.  */

#undef EMPTY_FIELD_BOUNDARY
#define EMPTY_FIELD_BOUNDARY 32


/* No data type wants to be aligned rounder than this.
   For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
   boundaries */

#undef BIGGEST_ALIGNMENT
#define BIGGEST_ALIGNMENT 64


/* The svr4 ABI for the m68k says that records and unions are returned
   in memory.  */

#undef DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 1

/* XXX
   This is the end of the chunk lifted from m68kv4.h  */