gcc/config/arm/bpabi.h

   1 /* Configuration file for ARM BPABI targets.
   2    Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
   3    Free Software Foundation, Inc.
   4    Contributed by CodeSourcery, LLC
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 /* Use the AAPCS ABI by default.  */
  23 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS
  24
  25 /* Assume that AAPCS ABIs should adhere to the full BPABI.  */
  26 #define TARGET_BPABI (TARGET_AAPCS_BASED)
  27
  28 /* BPABI targets use EABI frame unwinding tables.  */
  29 #undef ARM_UNWIND_INFO
  30 #define ARM_UNWIND_INFO 1
  31
  32 /* Section 4.1 of the AAPCS requires the use of VFP format.  */
  33 #undef  FPUTYPE_DEFAULT
  34 #define FPUTYPE_DEFAULT "vfp"
  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 #if TARGET_BIG_ENDIAN_DEFAULT
  59 #define BE8_LINK_SPEC \
  60   " %{!mlittle-endian:%{march=armv7-a|mcpu=cortex-a5    \
  61    |mcpu=cortex-a7                                      \
  62    |mcpu=cortex-a8|mcpu=cortex-a9|mcpu=cortex-a15       \
  63    |mcpu=generic-armv7-a                                \
  64    |march=armv7-m|mcpu=cortex-m3                        \
  65    |march=armv7e-m|mcpu=cortex-m4                       \
  66    |march=armv6-m|mcpu=cortex-m0                        \
  67    |march=armv8-a                                       \
  68    :%{!r:--be8}}}"
  69 #else
  70 #define BE8_LINK_SPEC \
  71   " %{mbig-endian:%{march=armv7-a|mcpu=cortex-a5        \
  72    |mcpu=cortex-a7                                      \
  73    |mcpu=cortex-a8|mcpu=cortex-a9|mcpu=cortex-a15       \
  74    |mcpu=generic-armv7-a                                \
  75    |march=armv7-m|mcpu=cortex-m3                        \
  76    |march=armv7e-m|mcpu=cortex-m4                       \
  77    |march=armv6-m|mcpu=cortex-m0                        \
  78    |march=armv8-a                                       \
  79    :%{!r:--be8}}}"
  80 #endif
  81
  82 /* Tell the assembler to build BPABI binaries.  */
  83 #undef  SUBTARGET_EXTRA_ASM_SPEC
  84 #define SUBTARGET_EXTRA_ASM_SPEC \
  85   "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC
  86
  87 #ifndef SUBTARGET_EXTRA_LINK_SPEC
  88 #define SUBTARGET_EXTRA_LINK_SPEC ""
  89 #endif
  90
  91 /* The generic link spec in elf.h does not support shared libraries.  */
  92 #define BPABI_LINK_SPEC \
  93   "%{mbig-endian:-EB} %{mlittle-endian:-EL} "           \
  94   "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} "        \
  95   "-X" SUBTARGET_EXTRA_LINK_SPEC TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC
  96
  97 #undef  LINK_SPEC
  98 #define LINK_SPEC BPABI_LINK_SPEC
  99
 100 /* The BPABI requires that we always use an out-of-line implementation
 101    of RTTI comparison, even if the target supports weak symbols,
 102    because the same object file might be used on a target that does
 103    not support merging symbols across DLL boundaries.  This macro is
 104    broken out separately so that it can be used within
 105    TARGET_OS_CPP_BUILTINS in configuration files for systems based on
 106    the BPABI.  */
 107 #define TARGET_BPABI_CPP_BUILTINS()                     \
 108   do                                                    \
 109     {                                                   \
 110       builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");      \
 111     }                                                   \
 112   while (false)
 113
 114 #undef TARGET_OS_CPP_BUILTINS
 115 #define TARGET_OS_CPP_BUILTINS() \
 116   TARGET_BPABI_CPP_BUILTINS()
 117
 118 /* The BPABI specifies the use of .{init,fini}_array.  Therefore, we
 119    do not want GCC to put anything into the .{init,fini} sections.  */
 120 #undef INIT_SECTION_ASM_OP
 121 #undef FINI_SECTION_ASM_OP
 122 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
 123 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP
 124
 125 /* The legacy _mcount implementation assumes r11 points to a
 126     4-word APCS frame.  This is generally not true for EABI targets,
 127     particularly not in Thumb mode.  We assume the mcount
 128     implementation does not require a counter variable (No Counter).
 129     Note that __gnu_mcount_nc will be entered with a misaligned stack.
 130     This is OK because it uses a special calling convention anyway.  */
 131
 132 #undef  NO_PROFILE_COUNTERS
 133 #define NO_PROFILE_COUNTERS 1
 134 #undef  ARM_FUNCTION_PROFILER
 135 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 136 {                                                                       \
 137   fprintf (STREAM, "\tpush\t{lr}\n");                                   \
 138   fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n");                          \
 139 }
 140
 141 #undef SUBTARGET_FRAME_POINTER_REQUIRED
 142 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
 143
 144 /* __gnu_mcount_nc restores the original LR value before returning.  Ensure
 145    that there is no unnecessary hook set up.  */
 146 #undef PROFILE_HOOK