gcc/config/arm/elf.h

/* Definitions of target machine for GNU compiler.
   For ARM with ELF obj format.
   Copyright (C) 1995-2015 Free Software Foundation, Inc.
   Contributed by Philip Blundell <philb@gnu.org> and
   Catherine Moore <clm@cygnus.com>
   
   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.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef OBJECT_FORMAT_ELF
 #error elf.h included before elfos.h
#endif

#ifndef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX "."
#endif

#ifndef SUBTARGET_CPP_SPEC
#define SUBTARGET_CPP_SPEC  "-D__ELF__"
#endif

#ifndef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS \
  { "subtarget_extra_asm_spec",	SUBTARGET_EXTRA_ASM_SPEC }, \
  { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
  SUBSUBTARGET_EXTRA_SPECS
#endif

#ifndef SUBTARGET_EXTRA_ASM_SPEC
#define SUBTARGET_EXTRA_ASM_SPEC ""
#endif

#ifndef SUBTARGET_ASM_FLOAT_SPEC
#define SUBTARGET_ASM_FLOAT_SPEC "\
%{mapcs-float:-mfloat}"
#endif

#undef SUBSUBTARGET_EXTRA_SPECS
#define SUBSUBTARGET_EXTRA_SPECS

#ifndef ASM_SPEC
#define ASM_SPEC "\
%{mbig-endian:-EB} \
%{mlittle-endian:-EL} \
%(asm_cpu_spec) \
%{mapcs-*:-mapcs-%*} \
%(subtarget_asm_float_spec) \
%{mthumb-interwork:-mthumb-interwork} \
%{mfloat-abi=*} %{mfpu=*} \
%(subtarget_extra_asm_spec)"
#endif

/* The ARM uses @ are a comment character so we need to redefine
   TYPE_OPERAND_FMT.  */
#undef  TYPE_OPERAND_FMT
#define TYPE_OPERAND_FMT	"%%%s"

/* We might need a ARM specific header to function declarations.  */
#undef  ASM_DECLARE_FUNCTION_NAME
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)		\
  do								\
    {								\
      ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);		\
      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");	\
      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));		\
      ASM_OUTPUT_LABEL(FILE, NAME);				\
      ARM_OUTPUT_FN_UNWIND (FILE, TRUE);			\
    }								\
  while (0)

/* We might need an ARM specific trailer for function declarations.  */
#undef  ASM_DECLARE_FUNCTION_SIZE
#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)		\
  do								\
    {								\
      ARM_OUTPUT_FN_UNWIND (FILE, FALSE);			\
      if (!flag_inhibit_size_directive)				\
	ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);			\
    }								\
  while (0)

/* Define this macro if jump tables (for `tablejump' insns) should be
   output in the text section, along with the assembler instructions.
   Otherwise, the readonly data section is used.  */
/* We put ARM and Thumb-2 jump tables in the text section, because it makes
   the code more efficient, but for Thumb-1 it's better to put them out of
   band unless we are generating compressed tables.  */
#define JUMP_TABLES_IN_TEXT_SECTION					\
   (TARGET_32BIT || (TARGET_THUMB && (optimize_size || flag_pic)))

#ifndef LINK_SPEC
#define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X"
#endif
  
/* Run-time Target Specification.  */
#ifndef TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_APCS_FRAME)
#endif

#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
  { "marm", "mlittle-endian", "mfloat-abi=soft", "mno-thumb-interwork", "fno-leading-underscore" }
#endif

#define TARGET_ASM_FILE_START_APP_OFF true
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true


/* Output an element in the static constructor array.  */
#undef TARGET_ASM_CONSTRUCTOR
#define TARGET_ASM_CONSTRUCTOR arm_elf_asm_constructor

#undef TARGET_ASM_DESTRUCTOR
#define TARGET_ASM_DESTRUCTOR arm_elf_asm_destructor

/* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
#define NEED_PLT_RELOC	flag_pic
#define NEED_GOT_RELOC	flag_pic

/* The ELF assembler handles GOT addressing differently to NetBSD.  */
#define GOT_PCREL	0

/* Align output to a power of two.  Note ".align 0" is redundant,
   and also GAS will treat it as ".align 2" which we do not want.  */
#define ASM_OUTPUT_ALIGN(STREAM, POWER)			\
  do							\
    {							\
      if ((POWER) > 0)					\
	fprintf (STREAM, "\t.align\t%d\n", POWER);	\
    }							\
  while (0)

/* Horrible hack: We want to prevent some libgcc routines being included
   for some multilibs.  */
#ifndef __ARM_ARCH_6M__
#undef L_fixdfsi
#undef L_fixunsdfsi
#undef L_truncdfsf2
#undef L_fixsfsi
#undef L_fixunssfsi
#undef L_floatdidf
#undef L_floatdisf
#undef L_floatundidf
#undef L_floatundisf
#endif