gcc/config/arm/linux-eabi.h

   1 /* Configuration file for ARM GNU/Linux EABI targets.
   2    Copyright (C) 2004-2024 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 /* On EABI GNU/Linux, we want both the BPABI builtins and the
  22    GNU/Linux builtins.  */
  23 #undef  TARGET_OS_CPP_BUILTINS
  24 #define TARGET_OS_CPP_BUILTINS()                \
  25   do                                            \
  26     {                                           \
  27       TARGET_BPABI_CPP_BUILTINS();              \
  28       GNU_USER_TARGET_OS_CPP_BUILTINS();        \
  29       ANDROID_TARGET_OS_CPP_BUILTINS();         \
  30     }                                           \
  31   while (false)
  32
  33 /* We default to a soft-float ABI so that binaries can run on all
  34    target hardware.  If you override this to use the hard-float ABI then
  35    change the setting of GLIBC_DYNAMIC_LINKER_DEFAULT as well.  */
  36 #undef  TARGET_DEFAULT_FLOAT_ABI
  37 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
  38
  39 /* We default to the "aapcs-linux" ABI so that enums are int-sized by
  40    default.  */
  41 #undef  ARM_DEFAULT_ABI
  42 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
  43
  44 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  45    config.gcc for big endian configurations.  */
  46 #undef  TARGET_LINKER_EMULATION
  47 #if TARGET_BIG_ENDIAN_DEFAULT
  48 #define TARGET_LINKER_EMULATION "armelfb_linux_eabi"
  49 #else
  50 #define TARGET_LINKER_EMULATION "armelf_linux_eabi"
  51 #endif
  52
  53 #undef  SUBTARGET_EXTRA_LINK_SPEC
  54 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION
  55
  56 /* GNU/Linux on ARM currently supports three dynamic linkers:
  57    - ld-linux.so.2 - for the legacy ABI
  58    - ld-linux.so.3 - for the EABI-derived soft-float ABI
  59    - ld-linux-armhf.so.3 - for the EABI-derived hard-float ABI.
  60    All the dynamic linkers live in /lib.
  61    We default to soft-float, but this can be overridden by changing both
  62    GLIBC_DYNAMIC_LINKER_DEFAULT and TARGET_DEFAULT_FLOAT_ABI.  */
  63
  64 #undef  GLIBC_DYNAMIC_LINKER
  65 #define GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "/lib/ld-linux.so.3"
  66 #define GLIBC_DYNAMIC_LINKER_HARD_FLOAT "/lib/ld-linux-armhf.so.3"
  67 #define GLIBC_DYNAMIC_LINKER_DEFAULT GLIBC_DYNAMIC_LINKER_SOFT_FLOAT
  68
  69 #define GLIBC_DYNAMIC_LINKER \
  70    "%{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \
  71     %{mfloat-abi=soft*:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "} \
  72     %{!mfloat-abi=*:" GLIBC_DYNAMIC_LINKER_DEFAULT "}"
  73
  74 /* For ARM musl currently supports four dynamic linkers:
  75    - ld-musl-arm.so.1 - for the EABI-derived soft-float ABI
  76    - ld-musl-armhf.so.1 - for the EABI-derived hard-float ABI
  77    - ld-musl-armeb.so.1 - for the EABI-derived soft-float ABI, EB
  78    - ld-musl-armebhf.so.1 - for the EABI-derived hard-float ABI, EB
  79    musl does not support the legacy OABI mode.
  80    All the dynamic linkers live in /lib.
  81    We default to soft-float, EL. */
  82 #undef  MUSL_DYNAMIC_LINKER
  83 #if TARGET_BIG_ENDIAN_DEFAULT
  84 #define MUSL_DYNAMIC_LINKER_E "%{mlittle-endian:;:eb}"
  85 #else
  86 #define MUSL_DYNAMIC_LINKER_E "%{mbig-endian:eb}"
  87 #endif
  88 #define MUSL_DYNAMIC_LINKER \
  89   "/lib/ld-musl-arm" MUSL_DYNAMIC_LINKER_E "%{mfloat-abi=hard:hf}%{mfdpic:-fdpic}.so.1"
  90
  91 /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
  92    use the GNU/Linux version, not the generic BPABI version.  */
  93 #undef  LINK_SPEC
  94 #define LINK_SPEC EABI_LINK_SPEC                                        \
  95   LINUX_OR_ANDROID_LD (LINUX_TARGET_LINK_SPEC,                          \
  96                        LINUX_TARGET_LINK_SPEC " " ANDROID_LINK_SPEC)
  97
  98 #undef  ASAN_CC1_SPEC
  99 #define ASAN_CC1_SPEC "%{%:sanitize(address):-funwind-tables}"
 100
 101 #define FDPIC_CC1_SPEC ""
 102
 103 #undef  CC1_SPEC
 104 #define CC1_SPEC                                                        \
 105   LINUX_OR_ANDROID_CC (GNU_USER_TARGET_CC1_SPEC " " ASAN_CC1_SPEC " "   \
 106                        FDPIC_CC1_SPEC,                                  \
 107                        GNU_USER_TARGET_CC1_SPEC " " ASAN_CC1_SPEC " "   \
 108                        ANDROID_CC1_SPEC)
 109
 110 #define CC1PLUS_SPEC \
 111   LINUX_OR_ANDROID_CC ("", ANDROID_CC1PLUS_SPEC)
 112
 113 #undef  LIB_SPEC
 114 #define LIB_SPEC                                                        \
 115   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_LIB_SPEC,                        \
 116                     GNU_USER_TARGET_NO_PTHREADS_LIB_SPEC " " ANDROID_LIB_SPEC)
 117
 118 #undef  STARTFILE_SPEC
 119 #define STARTFILE_SPEC \
 120   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
 121
 122 #undef  ENDFILE_SPEC
 123 #define ENDFILE_SPEC \
 124   "%{Ofast|ffast-math|funsafe-math-optimizations:%{!shared:crtfastmath.o%s}} "  \
 125   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
 126
 127 /* Use the default LIBGCC_SPEC, not the version in linux-elf.h, as we
 128    do not use -lfloat.  */
 129 #undef LIBGCC_SPEC
 130
 131 /* Clear the instruction cache from `beg' to `end'.  This is
 132    implemented in lib1funcs.S, so ensure an error if this definition
 133    is used.  */
 134 #undef  CLEAR_INSN_CACHE
 135 #define CLEAR_INSN_CACHE(BEG, END) not_used
 136
 137 #define ARM_TARGET2_DWARF_FORMAT (DW_EH_PE_pcrel | DW_EH_PE_indirect)