gcc/config/arm/bpabi.h

   1 /* Configuration file for ARM BPABI targets.
   2    Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
   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 #define BE8_LINK_SPEC " %{mbig-endian:%{march=armv7-a|mcpu=cortex-a5"\
  59   "|mcpu=cortex-a8|mcpu=cortex-a9|mcpu=cortex-a15:%{!r:--be8}}}"
  60
  61 /* Tell the assembler to build BPABI binaries.  */
  62 #undef  SUBTARGET_EXTRA_ASM_SPEC
  63 #define SUBTARGET_EXTRA_ASM_SPEC \
  64   "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC
  65
  66 #ifndef SUBTARGET_EXTRA_LINK_SPEC
  67 #define SUBTARGET_EXTRA_LINK_SPEC ""
  68 #endif
  69
  70 /* The generic link spec in elf.h does not support shared libraries.  */
  71 #define BPABI_LINK_SPEC \
  72   "%{mbig-endian:-EB} %{mlittle-endian:-EL} "           \
  73   "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} "        \
  74   "-X" SUBTARGET_EXTRA_LINK_SPEC TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC
  75
  76 #undef  LINK_SPEC
  77 #define LINK_SPEC BPABI_LINK_SPEC
  78
  79 /* The BPABI requires that we always use an out-of-line implementation
  80    of RTTI comparison, even if the target supports weak symbols,
  81    because the same object file might be used on a target that does
  82    not support merging symbols across DLL boundaries.  This macro is
  83    broken out separately so that it can be used within
  84    TARGET_OS_CPP_BUILTINS in configuration files for systems based on
  85    the BPABI.  */
  86 #define TARGET_BPABI_CPP_BUILTINS()                     \
  87   do                                                    \
  88     {                                                   \
  89       builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");      \
  90     }                                                   \
  91   while (false)
  92
  93 #undef TARGET_OS_CPP_BUILTINS
  94 #define TARGET_OS_CPP_BUILTINS() \
  95   TARGET_BPABI_CPP_BUILTINS()
  96
  97 /* The BPABI specifies the use of .{init,fini}_array.  Therefore, we
  98    do not want GCC to put anything into the .{init,fini} sections.  */
  99 #undef INIT_SECTION_ASM_OP
 100 #undef FINI_SECTION_ASM_OP
 101 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
 102 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP
 103
 104 /* The legacy _mcount implementation assumes r11 points to a
 105     4-word APCS frame.  This is generally not true for EABI targets,
 106     particularly not in Thumb mode.  We assume the mcount
 107     implementation does not require a counter variable (No Counter).
 108     Note that __gnu_mcount_nc will be entered with a misaligned stack.
 109     This is OK because it uses a special calling convention anyway.  */
 110
 111 #undef  NO_PROFILE_COUNTERS
 112 #define NO_PROFILE_COUNTERS 1
 113 #undef  ARM_FUNCTION_PROFILER
 114 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 115 {                                                                       \
 116   fprintf (STREAM, "\tpush\t{lr}\n");                                   \
 117   fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n");                          \
 118 }
 119
 120 #undef SUBTARGET_FRAME_POINTER_REQUIRED
 121 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
 122
 123 /* __gnu_mcount_nc restores the original LR value before returning.  Ensure
 124    that there is no unnecessary hook set up.  */
 125 #undef PROFILE_HOOK