gcc/config/arm/freebsd.h

   1 /* Definitions of target machine for GNU compiler, FreeBSD/arm version.
   2    Copyright (C) 2002-2025 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   " FBSD_LINK_PG_NOTE "                                                 \
  51   %{v:-V}                                                               \
  52   %{assert*} %{R*} %{rpath*} %{defsym*}                                 \
  53   %{shared:-Bshareable %{h*} %{soname*}}                                \
  54   %{!shared:                                                            \
  55     %{!static:                                                          \
  56       %{rdynamic:-export-dynamic}                                       \
  57       %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }}       \
  58     %{static:-Bstatic}}                                                 \
  59   %{!static:--hash-style=both --enable-new-dtags}                       \
  60   %{symbolic:-Bsymbolic}                                                \
  61   -X %{mbig-endian:-EB} %{mlittle-endian:-EL}"
  62
  63 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  64    config.gcc for big endian configurations.  */
  65 #if TARGET_BIG_ENDIAN_DEFAULT
  66 #define TARGET_ENDIAN_DEFAULT    MASK_BIG_END
  67 #define TARGET_ENDIAN_OPTION     "mbig-endian"
  68 #define TARGET_LINKER_EMULATION  "armelfb_fbsd"
  69 #else
  70 #define TARGET_ENDIAN_DEFAULT    0
  71 #define TARGET_ENDIAN_OPTION     "mlittle-endian"
  72 #define TARGET_LINKER_EMULATION  "armelf_fbsd"
  73 #endif
  74
  75 #undef  SUBTARGET_EXTRA_LINK_SPEC
  76 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
  77
  78 #undef  TARGET_OS_CPP_BUILTINS
  79 #define TARGET_OS_CPP_BUILTINS()                \
  80   do                                            \
  81     {                                           \
  82         FBSD_TARGET_OS_CPP_BUILTINS ();         \
  83         TARGET_BPABI_CPP_BUILTINS ();           \
  84     }                                           \
  85   while (false)
  86
  87 /* We default to a soft-float ABI so that binaries can run on all
  88    target hardware.  */
  89 #undef TARGET_DEFAULT_FLOAT_ABI
  90 #ifdef TARGET_FREEBSD_ARM_HARD_FLOAT
  91 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  92 #else
  93 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
  94 #endif
  95
  96 #undef ARM_DEFAULT_ABI
  97
  98 /* AACPS_LINUX has access to kernel atomic ops while we don't.
  99    But AACPS defaults to short_enums.  */
 100 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
 101
 102 #undef TARGET_DEFAULT
 103 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
 104
 105 /* We do not have any MULTILIB_OPTIONS specified, so there are no
 106    MULTILIB_DEFAULTS.  */
 107 #undef  MULTILIB_DEFAULTS
 108
 109 /*  Use the AAPCS type for wchar_t, override the one from config/freebsd.h.  */
 110 #undef  WCHAR_TYPE
 111 #define WCHAR_TYPE  "unsigned int"
 112
 113 #undef  WCHAR_TYPE_SIZE
 114 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 115
 116 /* FreeBSD 10 does not support unaligned access for armv6 and up.
 117    Unaligned access support was added in FreeBSD 11.  */
 118 #if FBSD_MAJOR < 11
 119 #define SUBTARGET_OVERRIDE_INTERNAL_OPTIONS                             \
 120 do {                                                                    \
 121     if (opts_set->x_unaligned_access == 1)                              \
 122         warning (0, "target OS does not support unaligned accesses");   \
 123     if (opts->x_unaligned_access)                                       \
 124         opts->x_unaligned_access = 0;                                   \
 125 } while (0)
 126 #endif
 127
 128 #undef MAX_SYNC_LIBFUNC_SIZE
 129 #define MAX_SYNC_LIBFUNC_SIZE 4 /* UNITS_PER_WORD not defined yet.  */
 130
 131 /* FreeBSD does its profiling differently to the Acorn compiler.  We
 132    don't need a word following the mcount call; and to skip it
 133    requires either an assembly stub or use of fomit-frame-pointer when
 134    compiling the profiling functions.  Since we break Acorn CC
 135    compatibility below a little more won't hurt.  */
 136
 137 #undef ARM_FUNCTION_PROFILER
 138 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO)           \
 139 {                                                       \
 140   asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n");          \
 141   asm_fprintf (STREAM, "\tbl\t__mcount%s\n",            \
 142                (TARGET_ARM && NEED_PLT_RELOC)           \
 143                ? "(PLT)" : "");                         \
 144 }
 145
 146 /* Clear the instruction cache from `BEG' to `END'.  This makes a
 147    call to the ARM_SYNC_ICACHE architecture specific syscall.  */
 148 #define CLEAR_INSN_CACHE(BEG, END)                                      \
 149 do                                                                      \
 150   {                                                                     \
 151     extern int sysarch (int number, void *args);                        \
 152     struct                                                              \
 153       {                                                                 \
 154         unsigned int addr;                                              \
 155         int          len;                                               \
 156       } s;                                                              \
 157     s.addr = (unsigned int) (BEG);                                      \
 158     s.len = (END) - (BEG);                                              \
 159     (void) sysarch (0, &s);                                             \
 160   }                                                                     \
 161 while (0)
 162
 163 /* This is how we tell the assembler that two symbols have the same value.  */
 164 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
 165   do                                       \
 166     {                                      \
 167      assemble_name (FILE, NAME1);          \
 168      fputs (" = ", FILE);                  \
 169      assemble_name (FILE, NAME2);          \
 170      fputc ('\n', FILE);                   \
 171     }                                      \
 172   while (0)
 173
 174 /* Add  .note.GNU-stack.  */
 175 #undef NEED_INDICATE_EXEC_STACK
 176 #define NEED_INDICATE_EXEC_STACK 1
 177
 178 #define ARM_TARGET2_DWARF_FORMAT (DW_EH_PE_pcrel | DW_EH_PE_indirect)
 179