gcc/config/arm/freebsd.h

   1 /* Definitions of target machine for GNU compiler, FreeBSD/arm version.
   2    Copyright (C) 2002-2022 Free Software Foundation, Inc.
   3    Contributed by Wasabi Systems, Inc.
   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
  22    along with GCC; see the file COPYING3.  If not see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 #undef  SUBTARGET_CPP_SPEC
  26 #define SUBTARGET_CPP_SPEC FBSD_CPP_SPEC
  27
  28 #undef  SUBTARGET_EXTRA_SPECS
  29 #define SUBTARGET_EXTRA_SPECS                                   \
  30   { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC },     \
  31   { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC },     \
  32   { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
  33
  34 #undef SUBTARGET_EXTRA_ASM_SPEC
  35 #define SUBTARGET_EXTRA_ASM_SPEC \
  36   "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5} " TARGET_FIX_V4BX_SPEC " \
  37   %{" FPIE_OR_FPIC_SPEC ":-k}"
  38
  39 #undef SUBTARGET_ASM_FLOAT_SPEC
  40 #ifdef TARGET_FREEBSD_ARM_HARD_FLOAT
  41 /* Default to full vfp if we build for arm*hf.  */
  42 #define SUBTARGET_ASM_FLOAT_SPEC "%{!mfpu=*:-mfpu=vfp}"
  43 #else
  44 #define SUBTARGET_ASM_FLOAT_SPEC "%{!mfpu=*:-mfpu=softvfp}"
  45 #endif
  46
  47 #undef  LINK_SPEC
  48 #define LINK_SPEC "                                                     \
  49   %{p:%nconsider using `-pg' instead of `-p' with gprof (1)}            \
  50   %{v:-V}                                                               \
  51   %{assert*} %{R*} %{rpath*} %{defsym*}                                 \
  52   %{shared:-Bshareable %{h*} %{soname*}}                                \
  53   %{!shared:                                                            \
  54     %{!static:                                                          \
  55       %{rdynamic:-export-dynamic}                                       \
  56       %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }}       \
  57     %{static:-Bstatic}}                                                 \
  58   %{!static:--hash-style=both --enable-new-dtags}                       \
  59   %{symbolic:-Bsymbolic}                                                \
  60   -X %{mbig-endian:-EB} %{mlittle-endian:-EL}"
  61
  62 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  63    config.gcc for big endian configurations.  */
  64 #if TARGET_BIG_ENDIAN_DEFAULT
  65 #define TARGET_ENDIAN_DEFAULT    MASK_BIG_END
  66 #define TARGET_ENDIAN_OPTION     "mbig-endian"
  67 #define TARGET_LINKER_EMULATION  "armelfb_fbsd"
  68 #else
  69 #define TARGET_ENDIAN_DEFAULT    0
  70 #define TARGET_ENDIAN_OPTION     "mlittle-endian"
  71 #define TARGET_LINKER_EMULATION  "armelf_fbsd"
  72 #endif
  73
  74 #undef  SUBTARGET_EXTRA_LINK_SPEC
  75 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
  76
  77 #undef  TARGET_OS_CPP_BUILTINS
  78 #define TARGET_OS_CPP_BUILTINS()                \
  79   do                                            \
  80     {                                           \
  81         FBSD_TARGET_OS_CPP_BUILTINS ();         \
  82         TARGET_BPABI_CPP_BUILTINS ();           \
  83     }                                           \
  84   while (false)
  85
  86 /* We default to a soft-float ABI so that binaries can run on all
  87    target hardware.  */
  88 #undef TARGET_DEFAULT_FLOAT_ABI
  89 #ifdef TARGET_FREEBSD_ARM_HARD_FLOAT
  90 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  91 #else
  92 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
  93 #endif
  94
  95 #undef ARM_DEFAULT_ABI
  96
  97 /* AACPS_LINUX has access to kernel atomic ops while we don't.
  98    But AACPS defaults to short_enums.  */
  99 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
 100
 101 #undef TARGET_DEFAULT
 102 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
 103
 104 /* We do not have any MULTILIB_OPTIONS specified, so there are no
 105    MULTILIB_DEFAULTS.  */
 106 #undef  MULTILIB_DEFAULTS
 107
 108 /*  Use the AAPCS type for wchar_t, override the one from config/freebsd.h.  */
 109 #undef  WCHAR_TYPE
 110 #define WCHAR_TYPE  "unsigned int"
 111
 112 #undef  WCHAR_TYPE_SIZE
 113 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 114
 115 /* FreeBSD 10 does not support unaligned access for armv6 and up.
 116    Unaligned access support was added in FreeBSD 11.  */
 117 #if FBSD_MAJOR < 11
 118 #define SUBTARGET_OVERRIDE_INTERNAL_OPTIONS                             \
 119 do {                                                                    \
 120     if (opts_set->x_unaligned_access == 1)                              \
 121         warning (0, "target OS does not support unaligned accesses");   \
 122     if (opts->x_unaligned_access)                                       \
 123         opts->x_unaligned_access = 0;                                   \
 124 } while (0)
 125 #endif
 126
 127 #undef MAX_SYNC_LIBFUNC_SIZE
 128 #define MAX_SYNC_LIBFUNC_SIZE 4 /* UNITS_PER_WORD not defined yet.  */
 129
 130 /* FreeBSD does its profiling differently to the Acorn compiler.  We
 131    don't need a word following the mcount call; and to skip it
 132    requires either an assembly stub or use of fomit-frame-pointer when
 133    compiling the profiling functions.  Since we break Acorn CC
 134    compatibility below a little more won't hurt.  */
 135
 136 #undef ARM_FUNCTION_PROFILER
 137 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO)           \
 138 {                                                       \
 139   asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n");          \
 140   asm_fprintf (STREAM, "\tbl\t__mcount%s\n",            \
 141                (TARGET_ARM && NEED_PLT_RELOC)           \
 142                ? "(PLT)" : "");                         \
 143 }
 144
 145 /* Clear the instruction cache from `BEG' to `END'.  This makes a
 146    call to the ARM_SYNC_ICACHE architecture specific syscall.  */
 147 #define CLEAR_INSN_CACHE(BEG, END)                                      \
 148 do                                                                      \
 149   {                                                                     \
 150     extern int sysarch (int number, void *args);                        \
 151     struct                                                              \
 152       {                                                                 \
 153         unsigned int addr;                                              \
 154         int          len;                                               \
 155       } s;                                                              \
 156     s.addr = (unsigned int) (BEG);                                      \
 157     s.len = (END) - (BEG);                                              \
 158     (void) sysarch (0, &s);                                             \
 159   }                                                                     \
 160 while (0)
 161
 162 /* This is how we tell the assembler that two symbols have the same value.  */
 163 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
 164   do                                       \
 165     {                                      \
 166      assemble_name (FILE, NAME1);          \
 167      fputs (" = ", FILE);                  \
 168      assemble_name (FILE, NAME2);          \
 169      fputc ('\n', FILE);                   \
 170     }                                      \
 171   while (0)
 172
 173 /* Add  .note.GNU-stack.  */
 174 #undef NEED_INDICATE_EXEC_STACK
 175 #define NEED_INDICATE_EXEC_STACK 1
 176
 177 #define ARM_TARGET2_DWARF_FORMAT (DW_EH_PE_pcrel | DW_EH_PE_indirect)
 178