external/gpl3/gcc/files/arm-minix.h

   1 /* Definitions for ARM running MINIX using the ELF format
   2    Copyright (C) 2001, 2004, 2007 Free Software Foundation, Inc.
   3    Contributed by David E. O'Brien <obrien@FreeBSD.org> and BSDi.
   4    Adapted for MINIX by Lionel Sambuc <lionel@minix3.org>
   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 #undef MINIX_TARGET_CPU_CPP_BUILTINS
  23 #define MINIX_TARGET_CPU_CPP_BUILTINS()         \
  24   do                                            \
  25     {                                           \
  26       TARGET_BPABI_CPP_BUILTINS();              \
  27       if (ARM_EABI_UNWIND_TABLES)               \
  28         builtin_define ("__UNWIND_TABLES__");   \
  29     }                                           \
  30   while (0)
  31
  32 /* Define the actual types of some ANSI-mandated types.
  33    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
  34    c-common.c, and config/<arch>/<arch>.h. */
  35 #undef  SIZE_TYPE
  36 #define SIZE_TYPE       "unsigned int"
  37
  38 #undef  PTRDIFF_TYPE
  39 #define PTRDIFF_TYPE    "int"
  40
  41 #undef WCHAR_TYPE
  42 #define WCHAR_TYPE      "int"
  43
  44 #undef WINT_TYPE
  45 #define WINT_TYPE       "int"
  46
  47 /* We don't have any limit on the length as out debugger is GDB.  */
  48 #undef DBX_CONTIN_LENGTH
  49
  50 /* NetBSD does its profiling differently to the Acorn compiler. We
  51    don't need a word following the mcount call; and to skip it
  52    requires either an assembly stub or use of fomit-frame-pointer when
  53    compiling the profiling functions.  Since we break Acorn CC
  54    compatibility below a little more won't hurt.  */
  55
  56 #undef ARM_FUNCTION_PROFILER
  57 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO)           \
  58 {                                                       \
  59   asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n");          \
  60   asm_fprintf (STREAM, "\tbl\t__mcount%s\n",            \
  61                (TARGET_ARM && NEED_PLT_RELOC)           \
  62                ? "(PLT)" : "");                         \
  63 }
  64
  65 /* VERY BIG NOTE: Change of structure alignment for NetBSD/arm.
  66    There are consequences you should be aware of...
  67
  68    Normally GCC/arm uses a structure alignment of 32 for compatibility
  69    with armcc.  This means that structures are padded to a word
  70    boundary.  However this causes problems with bugged NetBSD kernel
  71    code (possibly userland code as well - I have not checked every
  72    binary).  The nature of this bugged code is to rely on sizeof()
  73    returning the correct size of various structures rounded to the
  74    nearest byte (SCSI and ether code are two examples, the vm system
  75    is another).  This code breaks when the structure alignment is 32
  76    as sizeof() will report a word=rounded size.  By changing the
  77    structure alignment to 8. GCC will conform to what is expected by
  78    NetBSD.
  79
  80    This has several side effects that should be considered.
  81    1. Structures will only be aligned to the size of the largest member.
  82       i.e. structures containing only bytes will be byte aligned.
  83            structures containing shorts will be half word aligned.
  84            structures containing ints will be word aligned.
  85
  86       This means structures should be padded to a word boundary if
  87       alignment of 32 is required for byte structures etc.
  88
  89    2. A potential performance penalty may exist if strings are no longer
  90       word aligned.  GCC will not be able to use word load/stores to copy
  91       short strings.
  92
  93    This modification is not encouraged but with the present state of the
  94    NetBSD source tree it is currently the only solution that meets the
  95    requirements.  */
  96
  97 #undef DEFAULT_STRUCTURE_SIZE_BOUNDARY
  98 #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
  99
 100 /* Fixed-sized enum by default (-fno-short-enums) */
 101 #undef MINIX_CC1_SPEC
 102 #define MINIX_CC1_SPEC  "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} "
 103
 104 /* Use by default the new abi and calling standard */
 105 #undef ARM_DEFAULT_ABI
 106 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS
 107
 108 #undef ARM_EABI_UNWIND_TABLES
 109 #define ARM_EABI_UNWIND_TABLES 0
 110 #undef ARM_UNWIND_INFO
 111 #define ARM_UNWIND_INFO 0
 112 #undef ARM_DWARF_UNWIND_TABLES
 113 #define ARM_DWARF_UNWIND_TABLES 1
 114
 115 /* LSC: FIXME: When activated, some programs crash on qemu with an illegal
 116  *             instruction.
 117  *             The cause is unknown (Missing support on MINIX, missing support
 118  *             on the emulator, library error...).
 119  */
 120 #if 0
 121 /* Make sure we use hard-floating point ABI by default */
 122 #undef TARGET_DEFAULT_FLOAT_ABI
 123 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
 124 #endif
 125
 126 #if defined(NETBSD_NATIVE)
 127 /* LSC: On arm, when compiling statically, we need gcc_eh. */
 128 #undef MINIX_LINK_GCC_C_SEQUENCE_SPEC
 129 #define MINIX_LINK_GCC_C_SEQUENCE_SPEC \
 130         "%{static:--start-group} %G %L -lgcc_eh %{static:--end-group}%{!static:%G}"
 131 #endif /* defined(NETBSD_NATIVE) */
 132
 133 /* Default to full VFP if -mhard-float is specified.  */
 134 #undef MINIX_SUBTARGET_ASM_FLOAT_SPEC
 135 #define MINIX_SUBTARGET_ASM_FLOAT_SPEC                                  \
 136         "%{mhard-float:%{!mfpu=*:-mfpu=vfpv3-d16}}                      \
 137          %{mfloat-abi=hard:%{!mfpu=*:-mfpu=vfpv3-d16}}"
 138
 139 #undef MINIX_SUBTARGET_EXTRA_ASM_SPEC
 140 #define MINIX_SUBTARGET_EXTRA_ASM_SPEC                                  \
 141         "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}"              \
 142         TARGET_FIX_V4BX_SPEC                                            \
 143         "%{fpic|fpie:-k} %{fPIC|fPIE:-k}"
 144
 145 /* Little endian by default */
 146 #undef TARGET_ENDIAN_DEFAULT
 147 #define TARGET_ENDIAN_DEFAULT 0
 148
 149 #undef  SUBTARGET_CPU_DEFAULT
 150 #define SUBTARGET_CPU_DEFAULT   TARGET_CPU_cortexa8