gcc/config/arm/bpabi.h

   1 /* Configuration file for ARM BPABI targets.
   2    Copyright (C) 2004-2013 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    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /* Use the AAPCS ABI by default.  */
  22 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS
  23
  24 /* Assume that AAPCS ABIs should adhere to the full BPABI.  */
  25 #define TARGET_BPABI (TARGET_AAPCS_BASED)
  26
  27 /* BPABI targets use EABI frame unwinding tables.  */
  28 #undef ARM_UNWIND_INFO
  29 #define ARM_UNWIND_INFO 1
  30
  31 /* Section 4.1 of the AAPCS requires the use of VFP format.  */
  32 #undef  FPUTYPE_DEFAULT
  33 #define FPUTYPE_DEFAULT "vfp"
  34
  35 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  36    config.gcc for big endian configurations.  */
  37 #if TARGET_BIG_ENDIAN_DEFAULT
  38 #define TARGET_ENDIAN_DEFAULT MASK_BIG_END
  39 #else
  40 #define TARGET_ENDIAN_DEFAULT 0
  41 #endif
  42
  43 /* EABI targets should enable interworking by default.  */
  44 #undef  TARGET_DEFAULT
  45 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
  46
  47 /* The ARM BPABI functions return a boolean; they use no special
  48    calling convention.  */
  49 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) TARGET_BPABI
  50
  51 /* The BPABI integer comparison routines return { -1, 0, 1 }.  */
  52 #define TARGET_LIB_INT_CMP_BIASED !TARGET_BPABI
  53
  54 #define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\
  55   "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}"
  56
  57 #if TARGET_BIG_ENDIAN_DEFAULT
  58 #define BE8_LINK_SPEC \
  59   " %{!mlittle-endian:%{march=armv7-a|mcpu=cortex-a5    \
  60    |mcpu=cortex-a7                                      \
  61    |mcpu=cortex-a8|mcpu=cortex-a9|mcpu=cortex-a15       \
  62    |mcpu=generic-armv7-a                                \
  63    |march=armv7-m|mcpu=cortex-m3                        \
  64    |march=armv7e-m|mcpu=cortex-m4                       \
  65    |march=armv6-m|mcpu=cortex-m0                        \
  66    |march=armv8-a                                       \
  67    :%{!r:--be8}}}"
  68 #else
  69 #define BE8_LINK_SPEC \
  70   " %{mbig-endian:%{march=armv7-a|mcpu=cortex-a5        \
  71    |mcpu=cortex-a7                                      \
  72    |mcpu=cortex-a8|mcpu=cortex-a9|mcpu=cortex-a15       \
  73    |mcpu=generic-armv7-a                                \
  74    |march=armv7-m|mcpu=cortex-m3                        \
  75    |march=armv7e-m|mcpu=cortex-m4                       \
  76    |march=armv6-m|mcpu=cortex-m0                        \
  77    |march=armv8-a                                       \
  78    :%{!r:--be8}}}"
  79 #endif
  80
  81 /* Tell the assembler to build BPABI binaries.  */
  82 #undef  SUBTARGET_EXTRA_ASM_SPEC
  83 #define SUBTARGET_EXTRA_ASM_SPEC \
  84   "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC
  85
  86 #ifndef SUBTARGET_EXTRA_LINK_SPEC
  87 #define SUBTARGET_EXTRA_LINK_SPEC ""
  88 #endif
  89
  90 /* The generic link spec in elf.h does not support shared libraries.  */
  91 #define BPABI_LINK_SPEC \
  92   "%{mbig-endian:-EB} %{mlittle-endian:-EL} "           \
  93   "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} "        \
  94   "-X" SUBTARGET_EXTRA_LINK_SPEC TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC
  95
  96 #undef  LINK_SPEC
  97 #define LINK_SPEC BPABI_LINK_SPEC
  98
  99 /* The BPABI requires that we always use an out-of-line implementation
 100    of RTTI comparison, even if the target supports weak symbols,
 101    because the same object file might be used on a target that does
 102    not support merging symbols across DLL boundaries.  This macro is
 103    broken out separately so that it can be used within
 104    TARGET_OS_CPP_BUILTINS in configuration files for systems based on
 105    the BPABI.  */
 106 #define TARGET_BPABI_CPP_BUILTINS()                     \
 107   do                                                    \
 108     {                                                   \
 109       builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");      \
 110     }                                                   \
 111   while (false)
 112
 113 #undef TARGET_OS_CPP_BUILTINS
 114 #define TARGET_OS_CPP_BUILTINS() \
 115   TARGET_BPABI_CPP_BUILTINS()
 116
 117 /* The BPABI specifies the use of .{init,fini}_array.  Therefore, we
 118    do not want GCC to put anything into the .{init,fini} sections.  */
 119 #undef INIT_SECTION_ASM_OP
 120 #undef FINI_SECTION_ASM_OP
 121 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
 122 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP
 123
 124 /* The legacy _mcount implementation assumes r11 points to a
 125     4-word APCS frame.  This is generally not true for EABI targets,
 126     particularly not in Thumb mode.  We assume the mcount
 127     implementation does not require a counter variable (No Counter).
 128     Note that __gnu_mcount_nc will be entered with a misaligned stack.
 129     This is OK because it uses a special calling convention anyway.  */
 130
 131 #undef  NO_PROFILE_COUNTERS
 132 #define NO_PROFILE_COUNTERS 1
 133 #undef  ARM_FUNCTION_PROFILER
 134 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 135 {                                                                       \
 136   fprintf (STREAM, "\tpush\t{lr}\n");                                   \
 137   fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n");                          \
 138 }
 139
 140 #undef SUBTARGET_FRAME_POINTER_REQUIRED
 141 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
 142
 143 /* __gnu_mcount_nc restores the original LR value before returning.  Ensure
 144    that there is no unnecessary hook set up.  */
 145 #undef PROFILE_HOOK