gcc/config/sh/linux.h

   1 /* Definitions for SH running Linux-based GNU systems using ELF
   2    Copyright (C) 1999-2021 Free Software Foundation, Inc.
   3    Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
   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 /* Run-time Target Specification.  */
  22
  23 /* Enable DWARF 2 exceptions.  */
  24 #undef DWARF2_UNWIND_INFO
  25 #define DWARF2_UNWIND_INFO 1
  26
  27 #undef SUBTARGET_CPP_SPEC
  28 #define SUBTARGET_CPP_SPEC "\
  29    %{posix:-D_POSIX_SOURCE} \
  30    %{pthread:-D_REENTRANT -D_PTHREADS} \
  31 "
  32
  33 #define TARGET_OS_CPP_BUILTINS() \
  34   do                                            \
  35     {                                           \
  36       GNU_USER_TARGET_OS_CPP_BUILTINS();        \
  37     }                                           \
  38   while (0)
  39
  40 #undef TARGET_DEFAULT
  41 #define TARGET_DEFAULT \
  42   (TARGET_CPU_DEFAULT | TARGET_ENDIAN_DEFAULT | TARGET_OPT_DEFAULT)
  43
  44 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  45
  46 #if TARGET_ENDIAN_DEFAULT == MASK_LITTLE_ENDIAN
  47 #define MUSL_DYNAMIC_LINKER_E "%{mb:eb}"
  48 #else
  49 #define MUSL_DYNAMIC_LINKER_E "%{!ml:eb}"
  50 #endif
  51
  52 #if TARGET_CPU_DEFAULT & (MASK_HARD_SH2A_DOUBLE | MASK_SH4)
  53 /* "-nofpu" if any nofpu option is specified.  */
  54 #define MUSL_DYNAMIC_LINKER_FP \
  55   "%{m1|m2|m2a-nofpu|m3|m4-nofpu|m4-100-nofpu|m4-200-nofpu|m4-300-nofpu|" \
  56   "m4-340|m4-400|m4-500|m4al:-nofpu}"
  57 #else
  58 /* "-nofpu" if none of the hard fpu options are specified.  */
  59 #define MUSL_DYNAMIC_LINKER_FP "%{m2a|m4|m4-100|m4-200|m4-300|m4a:;:-nofpu}"
  60 #endif
  61
  62 #undef MUSL_DYNAMIC_LINKER
  63 #define MUSL_DYNAMIC_LINKER \
  64   "/lib/ld-musl-sh" MUSL_DYNAMIC_LINKER_E MUSL_DYNAMIC_LINKER_FP \
  65   "%{mfdpic:-fdpic}.so.1"
  66
  67 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  68
  69 #undef SUBTARGET_LINK_EMUL_SUFFIX
  70 #define SUBTARGET_LINK_EMUL_SUFFIX "%{mfdpic:_fd;:_linux}"
  71
  72 #undef SUBTARGET_LINK_SPEC
  73 #define SUBTARGET_LINK_SPEC \
  74   "%{shared:-shared} \
  75    %{!static: \
  76      %{rdynamic:-export-dynamic} \
  77      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  78    %{static:-static}"
  79
  80 /* Output assembler code to STREAM to call the profiler.  */
  81 #undef FUNCTION_PROFILER
  82 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  83   do {                                                                  \
  84         if (flag_pic)                                                   \
  85           {                                                             \
  86             fprintf (STREAM, "\tmov.l\t3f,r1\n");                       \
  87             fprintf (STREAM, "\tmova\t3f,r0\n");                        \
  88             fprintf (STREAM, "\tadd\tr1,r0\n");                         \
  89             fprintf (STREAM, "\tmov.l\t1f,r1\n");                       \
  90             fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                 \
  91           }                                                             \
  92         else                                                            \
  93           fprintf (STREAM, "\tmov.l\t1f,r1\n");                         \
  94         fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                        \
  95         fprintf (STREAM, "\tmova\t2f,r0\n");                            \
  96         fprintf (STREAM, "\tjmp\t@r1\n");                               \
  97         fprintf (STREAM, "\tlds\tr0,pr\n");                             \
  98         fprintf (STREAM, "\t.align\t2\n");                              \
  99         if (flag_pic)                                                   \
 100           {                                                             \
 101             fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                \
 102             fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");     \
 103           }                                                             \
 104         else                                                            \
 105           fprintf (STREAM, "1:\t.long\tmcount\n");                      \
 106         fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                      \
 107   } while (0)
 108
 109 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 110    to a fake register number 16 as a placeholder for the return address
 111    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 112    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 113    the register.  So the entry of dwarf_reg_size_table corresponding to
 114    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 115    so as to return itself for 16.  */
 116 #undef DBX_REGISTER_NUMBER
 117 #define DBX_REGISTER_NUMBER(REGNO) \
 118   (((REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))
 119
 120 /* Install the __sync libcalls.  */
 121 #undef TARGET_INIT_LIBFUNCS
 122 #define TARGET_INIT_LIBFUNCS  sh_init_sync_libfuncs
 123
 124 #undef SUBTARGET_OVERRIDE_OPTIONS
 125 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 126   do                                                                    \
 127     {                                                                   \
 128       /* Set default atomic model if it hasn't been specified.  */      \
 129       if (global_options_set.x_sh_atomic_model_str == 0)                \
 130         {                                                               \
 131           if (TARGET_SH3)                                               \
 132             sh_atomic_model_str = "soft-gusa";                          \
 133           else if (TARGET_SH1)                                          \
 134             sh_atomic_model_str = "soft-imask";                         \
 135         }                                                               \
 136       /* Set -musermode if it hasn't been specified.  */                \
 137       if (global_options_set.x_TARGET_USERMODE == 0)                    \
 138         TARGET_USERMODE = true;                                         \
 139     }                                                                   \
 140   while (0)