1  /* Definitions for SH running Linux-based GNU systems using ELF
       2     Copyright (C) 1999-2023 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 DEBUGGER_REGNO
     115     so as to return itself for 16.  */
     116  #undef DEBUGGER_REGNO
     117  #define DEBUGGER_REGNO(REGNO) \
     118    (((REGNO) == 16) ? 16 : SH_DEBUGGER_REGNO (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)