gcc/config/arc/linux.h

   1 /* Target macros for arc*-*-linux targets.
   2
   3    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public 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 /* Enable DWARF 2 exceptions.  */
  22 #undef DWARF2_UNWIND_INFO
  23 #define DWARF2_UNWIND_INFO 1
  24
  25 #define TARGET_OS_CPP_BUILTINS()                \
  26   do                                            \
  27     {                                           \
  28       GNU_USER_TARGET_OS_CPP_BUILTINS ();       \
  29     }                                           \
  30   while (0)
  31
  32 #define GLIBC_DYNAMIC_LINKER                                    \
  33   "/lib/ld-linux-arc%{mbig-endian:eb}%{mcpu=arc700:700}.so.2"
  34 #define UCLIBC_DYNAMIC_LINKER  "/lib/ld-uClibc.so.0"
  35
  36 /* Note that the default is to link against dynamic libraries, if they are
  37    available.  Override with -static.  */
  38 #undef LINK_SPEC
  39 #define LINK_SPEC "%{h*} \
  40   %{static:-Bstatic} \
  41   %{shared:-shared} \
  42   %{symbolic:-Bsymbolic} \
  43   %{!static: \
  44     %{rdynamic:-export-dynamic} \
  45     %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
  46   -X \
  47   %{mbig-endian:-EB} %{EB} %{EL} \
  48   %{!z:-z max-page-size=0x2000 -z common-page-size=0x2000} \
  49   %{mcpu=nps400:-marclinux_nps; :-marclinux}"
  50
  51 #undef STARTFILE_SPEC
  52 #define STARTFILE_SPEC                                                  \
  53   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
  54
  55 #undef ENDFILE_SPEC
  56 #define ENDFILE_SPEC                                                    \
  57   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
  58
  59 #undef LIB_SPEC
  60 #define LIB_SPEC  \
  61   "%{pthread:-lpthread} \
  62    %{shared:-lc} \
  63    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
  64
  65 #undef TARGET_ASM_FILE_END
  66 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  67
  68 /* No SDATA default for linux.  */
  69 #undef TARGET_SDATA_DEFAULT
  70 #define TARGET_SDATA_DEFAULT 0
  71
  72 /* We have medium calls.  */
  73 #undef TARGET_MMEDIUM_CALLS_DEFAULT
  74 #define TARGET_MMEDIUM_CALLS_DEFAULT 1
  75
  76 /* We do not have any MULTILIB_OPTIONS specified, so there are no
  77    MULTILIB_DEFAULTS.  */
  78 #undef  MULTILIB_DEFAULTS
  79
  80 /* Linux toolchains use r25 as the thread pointer register.  */
  81 #undef TARGET_ARC_TP_REGNO_DEFAULT
  82 #define TARGET_ARC_TP_REGNO_DEFAULT 25
  83
  84 #undef SUBTARGET_CPP_SPEC
  85 #define SUBTARGET_CPP_SPEC "\
  86    %{pthread:-D_REENTRANT} \
  87 "
  88
  89 /* Indexed loads are default off.  */
  90 #undef TARGET_INDEXED_LOADS_DEFAULT
  91 #define TARGET_INDEXED_LOADS_DEFAULT 0
  92
  93 /* Pre/post modify with register displacement are default off.  */
  94 #undef TARGET_AUTO_MODIFY_REG_DEFAULT
  95 #define TARGET_AUTO_MODIFY_REG_DEFAULT 0
  96
  97 #if DEFAULT_LIBC == LIBC_GLIBC
  98 /* Override linux.h LINK_EH_SPEC definition.
  99    Signalize that because we have fde-glibc, we don't need all C shared libs
 100    linked against -lgcc_s.  */
 101 #undef LINK_EH_SPEC
 102 #define LINK_EH_SPEC "--eh-frame-hdr "
 103 #endif
 104
 105 #undef SUBTARGET_CPP_SPEC
 106 #define SUBTARGET_CPP_SPEC "\
 107    %{pthread:-D_REENTRANT} \
 108 "
 109
 110 /* Build attribute: procedure call standard.  */
 111 #undef ATTRIBUTE_PCS
 112 #define ATTRIBUTE_PCS 3
 113
 114 /* Clear the instruction cache from `beg' to `end'.  This makes an
 115    inline system call to SYS_cacheflush.  */
 116 #undef CLEAR_INSN_CACHE
 117 #define CLEAR_INSN_CACHE(beg, end)                                      \
 118 {                                                                       \
 119   register unsigned long _beg __asm ("r0") = (unsigned long) (beg);     \
 120   register unsigned long _end __asm ("r1") = (unsigned long) (end);     \
 121   register unsigned long _xtr __asm ("r2") = 0;                         \
 122   register unsigned long _scno __asm ("r8") = 244;                      \
 123   __asm __volatile ("trap_s 0           ; sys_cache_sync"               \
 124                     : "=r" (_beg)                                       \
 125                     : "0" (_beg), "r" (_end), "r" (_xtr), "r" (_scno)); \
 126 }
 127
 128 /* Emit rtl for profiling.  Output assembler code to FILE
 129    to call "_mcount" for profiling a function entry.  */
 130 #define PROFILE_HOOK(LABEL)                                     \
 131   {                                                             \
 132    rtx fun, rt;                                                 \
 133    rt = get_hard_reg_initial_val (Pmode, RETURN_ADDR_REGNUM);   \
 134    fun = gen_rtx_SYMBOL_REF (Pmode, "_mcount");                 \
 135    emit_library_call (fun, LCT_NORMAL, VOIDmode, rt, Pmode);    \
 136   }
 137
 138 /* Enter/Leave ops are default off for linux targets.  */
 139 #undef TARGET_CODE_DENSITY_FRAME_DEFAULT
 140 #define TARGET_CODE_DENSITY_FRAME_DEFAULT 0