gcc/config/arm/bpabi.h

   1 /* Configuration file for ARM BPABI targets.
   2    Copyright (C) 2004-2022 Free Software Foundation, Inc.
   3    Contributed by CodeSourcery, LLC
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 /* Use the AAPCS ABI by default.  */
  27 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS
  28
  29 /* Assume that AAPCS ABIs should adhere to the full BPABI.  */
  30 #define TARGET_BPABI (TARGET_AAPCS_BASED)
  31
  32 /* BPABI targets use EABI frame unwinding tables.  */
  33 #undef ARM_UNWIND_INFO
  34 #define ARM_UNWIND_INFO 1
  35
  36 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  37    config.gcc for big endian configurations.  */
  38 #if TARGET_BIG_ENDIAN_DEFAULT
  39 #define TARGET_ENDIAN_DEFAULT MASK_BIG_END
  40 #else
  41 #define TARGET_ENDIAN_DEFAULT 0
  42 #endif
  43
  44 /* EABI targets should enable interworking by default.  */
  45 #undef  TARGET_DEFAULT
  46 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
  47
  48 /* The ARM BPABI functions return a boolean; they use no special
  49    calling convention.  */
  50 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) TARGET_BPABI
  51
  52 /* The BPABI integer comparison routines return { -1, 0, 1 }.  */
  53 #define TARGET_LIB_INT_CMP_BIASED !TARGET_BPABI
  54
  55 #define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\
  56   "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}"
  57
  58 #define TARGET_FDPIC_ASM_SPEC ""
  59
  60 #define BE8_LINK_SPEC                                                   \
  61   "%{!r:%{!mbe32:%:be8_linkopt(%{mlittle-endian:little}"                \
  62   "                            %{mbig-endian:big}"                      \
  63   "                            %{mbe8:be8}"                             \
  64   "                            %{march=*:arch %*})}}"
  65
  66 /* Tell the assembler to build BPABI binaries.  */
  67 #undef  SUBTARGET_EXTRA_ASM_SPEC
  68 #define SUBTARGET_EXTRA_ASM_SPEC \
  69   "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC \
  70   TARGET_FDPIC_ASM_SPEC
  71
  72 #ifndef SUBTARGET_EXTRA_LINK_SPEC
  73 #define SUBTARGET_EXTRA_LINK_SPEC ""
  74 #endif
  75
  76 /* Split out the EABI common values so other targets can use it.  */
  77 #define EABI_LINK_SPEC \
  78   TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC
  79
  80 /* The generic link spec in elf.h does not support shared libraries.  */
  81 #define BPABI_LINK_SPEC \
  82   "%{mbig-endian:-EB} %{mlittle-endian:-EL} "           \
  83   "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} "        \
  84   "-X" SUBTARGET_EXTRA_LINK_SPEC EABI_LINK_SPEC
  85
  86 #undef  LINK_SPEC
  87 #define LINK_SPEC BPABI_LINK_SPEC
  88
  89 /* The BPABI requires that we always use an out-of-line implementation
  90    of RTTI comparison, even if the target supports weak symbols,
  91    because the same object file might be used on a target that does
  92    not support merging symbols across DLL boundaries.  This macro is
  93    broken out separately so that it can be used within
  94    TARGET_OS_CPP_BUILTINS in configuration files for systems based on
  95    the BPABI.  */
  96 #define TARGET_BPABI_CPP_BUILTINS()                     \
  97   do                                                    \
  98     {                                                   \
  99       builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");      \
 100     }                                                   \
 101   while (false)
 102
 103 #undef TARGET_OS_CPP_BUILTINS
 104 #define TARGET_OS_CPP_BUILTINS() \
 105   TARGET_BPABI_CPP_BUILTINS()
 106
 107 /* The BPABI specifies the use of .{init,fini}_array.  Therefore, we
 108    do not want GCC to put anything into the .{init,fini} sections.  */
 109 #undef INIT_SECTION_ASM_OP
 110 #undef FINI_SECTION_ASM_OP
 111 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
 112 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP
 113
 114 /* The legacy _mcount implementation assumes r11 points to a
 115     4-word APCS frame.  This is generally not true for EABI targets,
 116     particularly not in Thumb mode.  We assume the mcount
 117     implementation does not require a counter variable (No Counter).
 118     Note that __gnu_mcount_nc will be entered with a misaligned stack.
 119     This is OK because it uses a special calling convention anyway.  */
 120
 121 #undef  NO_PROFILE_COUNTERS
 122 #define NO_PROFILE_COUNTERS 1
 123 #undef  ARM_FUNCTION_PROFILER
 124 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 125 {                                                                       \
 126   fprintf (STREAM, "\tpush\t{lr}\n");                                   \
 127   fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n");                          \
 128 }
 129
 130 #undef SUBTARGET_FRAME_POINTER_REQUIRED
 131 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
 132
 133 /* __gnu_mcount_nc restores the original LR value before returning.  Ensure
 134    that there is no unnecessary hook set up.  */
 135 #undef PROFILE_HOOK