xref: /netbsd/external/gpl3/gcc/dist/gcc/config/arm/bpabi.h (revision d9f24e1f)

/* Configuration file for ARM BPABI targets.
   Copyright (C) 2004-2020 Free Software Foundation, Inc.
   Contributed by CodeSourcery, LLC

   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/>.  */

/* Use the AAPCS ABI by default.  */
#undef ARM_DEFAULT_ABI
#define ARM_DEFAULT_ABI ARM_ABI_AAPCS

/* Assume that AAPCS ABIs should adhere to the full BPABI.  */
#define TARGET_BPABI (TARGET_AAPCS_BASED)

/* BPABI targets use EABI frame unwinding tables.  */
#undef ARM_UNWIND_INFO
#define ARM_UNWIND_INFO 1

/* TARGET_BIG_ENDIAN_DEFAULT is set in
   config.gcc for big endian configurations.  */
#if TARGET_BIG_ENDIAN_DEFAULT
#define TARGET_ENDIAN_DEFAULT MASK_BIG_END
#else
#define TARGET_ENDIAN_DEFAULT 0
#endif

/* EABI targets should enable interworking by default.  */
#undef  TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)

/* The ARM BPABI functions return a boolean; they use no special
   calling convention.  */
#define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) TARGET_BPABI

/* The BPABI integer comparison routines return { -1, 0, 1 }.  */
#define TARGET_LIB_INT_CMP_BIASED !TARGET_BPABI

#define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\
  "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}"

#define TARGET_FDPIC_ASM_SPEC ""

#define BE8_LINK_SPEC							\
  "%{!r:%{!mbe32:%:be8_linkopt(%{mlittle-endian:little}"		\
  "			       %{mbig-endian:big}"			\
  "			       %{mbe8:be8}"				\
  "			       %{march=*:arch %*})}}"

/* Tell the assembler to build BPABI binaries.  */
#undef  SUBTARGET_EXTRA_ASM_SPEC
#define SUBTARGET_EXTRA_ASM_SPEC \
  "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC \
  TARGET_FDPIC_ASM_SPEC

#ifndef SUBTARGET_EXTRA_LINK_SPEC
#define SUBTARGET_EXTRA_LINK_SPEC ""
#endif

/* Split out the EABI common values so other targets can use it.  */
#define EABI_LINK_SPEC \
  TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC

/* The generic link spec in elf.h does not support shared libraries.  */
#define BPABI_LINK_SPEC \
  "%{mbig-endian:-EB} %{mlittle-endian:-EL} "		\
  "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} "	\
  "-X" SUBTARGET_EXTRA_LINK_SPEC EABI_LINK_SPEC

#undef  LINK_SPEC
#define LINK_SPEC BPABI_LINK_SPEC

/* The BPABI requires that we always use an out-of-line implementation
   of RTTI comparison, even if the target supports weak symbols,
   because the same object file might be used on a target that does
   not support merging symbols across DLL boundaries.  This macro is
   broken out separately so that it can be used within
   TARGET_OS_CPP_BUILTINS in configuration files for systems based on
   the BPABI.  */
#define TARGET_BPABI_CPP_BUILTINS()			\
  do							\
    {							\
      builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");	\
    }							\
  while (false)

#undef TARGET_OS_CPP_BUILTINS
#define TARGET_OS_CPP_BUILTINS() \
  TARGET_BPABI_CPP_BUILTINS()

/* The BPABI specifies the use of .{init,fini}_array.  Therefore, we
   do not want GCC to put anything into the .{init,fini} sections.  */
#undef INIT_SECTION_ASM_OP
#define INIT_SECTION_ASM_OP ""
#undef FINI_SECTION_ASM_OP
#define FINI_SECTION_ASM_OP ""
#define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
#define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP

/* The legacy _mcount implementation assumes r11 points to a
    4-word APCS frame.  This is generally not true for EABI targets,
    particularly not in Thumb mode.  We assume the mcount
    implementation does not require a counter variable (No Counter).
    Note that __gnu_mcount_nc will be entered with a misaligned stack.
    This is OK because it uses a special calling convention anyway.  */

#undef  NO_PROFILE_COUNTERS
#define NO_PROFILE_COUNTERS 1
#undef  ARM_FUNCTION_PROFILER
#define ARM_FUNCTION_PROFILER(STREAM, LABELNO)  			\
{									\
  fprintf (STREAM, "\tpush\t{lr}\n");					\
  fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n");				\
}

#undef SUBTARGET_FRAME_POINTER_REQUIRED
#define SUBTARGET_FRAME_POINTER_REQUIRED 0

/* __gnu_mcount_nc restores the original LR value before returning.  Ensure
   that there is no unnecessary hook set up.  */
#undef PROFILE_HOOK