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      1 /* Definitions for SH running Linux-based GNU systems using ELF
      2    Copyright (C) 1999-2022 Free Software Foundation, Inc.
      3    Contributed by Kazumoto Kojima <kkojima (at) 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 (OPTION_SET_P (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 (OPTION_SET_P (TARGET_USERMODE) == 0)			\
    138 	TARGET_USERMODE = true;						\
    139     }									\
    140   while (0)
    141