gcc/config/sh/linux.h

   1 /* Definitions for SH running Linux-based GNU systems using ELF
   2    Copyright (C) 1999-2013 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 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  47
  48 #undef SUBTARGET_LINK_EMUL_SUFFIX
  49 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  50 #undef SUBTARGET_LINK_SPEC
  51 #define SUBTARGET_LINK_SPEC \
  52   "%{shared:-shared} \
  53    %{!static: \
  54      %{rdynamic:-export-dynamic} \
  55      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  56    %{static:-static}"
  57
  58 /* Output assembler code to STREAM to call the profiler.  */
  59 #undef FUNCTION_PROFILER
  60 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  61   do {                                                                  \
  62     if (TARGET_SHMEDIA)                                                 \
  63       {                                                                 \
  64         fprintf (STREAM, "\tpt\t1f,tr1\n");                             \
  65         fprintf (STREAM, "\taddi.l\tr15,-8,r15\n");                     \
  66         fprintf (STREAM, "\tst.l\tr15,0,r18\n");                        \
  67         if (flag_pic)                                                   \
  68           {                                                             \
  69             const char *gofs = "(datalabel _GLOBAL_OFFSET_TABLE_-(0f-.))"; \
  70             fprintf (STREAM, "\tmovi\t((%s>>16)&0xffff),r21\n", gofs);  \
  71             fprintf (STREAM, "\tshori\t(%s & 0xffff),r21\n", gofs);     \
  72             fprintf (STREAM, "0:\tptrel/u\tr21,tr0\n");                 \
  73             fprintf (STREAM, "\tmovi\t((mcount@GOTPLT)&0xffff),r22\n"); \
  74             fprintf (STREAM, "\tgettr\ttr0,r21\n");                     \
  75             fprintf (STREAM, "\tadd.l\tr21,r22,r21\n");                 \
  76             fprintf (STREAM, "\tld.l\tr21,0,r21\n");                    \
  77             fprintf (STREAM, "\tptabs\tr21,tr0\n");                     \
  78           }                                                             \
  79         else                                                            \
  80           fprintf (STREAM, "\tpt\tmcount,tr0\n");                       \
  81         fprintf (STREAM, "\tgettr\ttr1,r18\n");                         \
  82         fprintf (STREAM, "\tblink\ttr0,r63\n");                         \
  83         fprintf (STREAM, "1:\tld.l\tr15,0,r18\n");                      \
  84         fprintf (STREAM, "\taddi.l\tr15,8,r15\n");                      \
  85       }                                                                 \
  86     else                                                                \
  87       {                                                                 \
  88         if (flag_pic)                                                   \
  89           {                                                             \
  90             fprintf (STREAM, "\tmov.l\t3f,r1\n");                       \
  91             fprintf (STREAM, "\tmova\t3f,r0\n");                        \
  92             fprintf (STREAM, "\tadd\tr1,r0\n");                         \
  93             fprintf (STREAM, "\tmov.l\t1f,r1\n");                       \
  94             fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                 \
  95           }                                                             \
  96         else                                                            \
  97           fprintf (STREAM, "\tmov.l\t1f,r1\n");                         \
  98         fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                        \
  99         fprintf (STREAM, "\tmova\t2f,r0\n");                            \
 100         fprintf (STREAM, "\tjmp\t@r1\n");                               \
 101         fprintf (STREAM, "\tlds\tr0,pr\n");                             \
 102         fprintf (STREAM, "\t.align\t2\n");                              \
 103         if (flag_pic)                                                   \
 104           {                                                             \
 105             fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                \
 106             fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");     \
 107           }                                                             \
 108         else                                                            \
 109           fprintf (STREAM, "1:\t.long\tmcount\n");                      \
 110         fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                      \
 111       }                                                                 \
 112   } while (0)
 113
 114 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 115    to a fake register number 16 as a placeholder for the return address
 116    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 117    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 118    the register.  So the entry of dwarf_reg_size_table corresponding to
 119    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 120    so as to return itself for 16.  */
 121 #undef DBX_REGISTER_NUMBER
 122 #define DBX_REGISTER_NUMBER(REGNO) \
 123   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))
 124
 125 /* Since libgcc is compiled with -fpic for this target, we can't use
 126    __sdivsi3_1 as the division strategy for -O0 and -Os.  */
 127 #undef SH_DIV_STRATEGY_DEFAULT
 128 #define SH_DIV_STRATEGY_DEFAULT SH_DIV_CALL2
 129 #undef SH_DIV_STR_FOR_SIZE
 130 #define SH_DIV_STR_FOR_SIZE "call2"
 131
 132 /* Install the __sync libcalls.  */
 133 #undef TARGET_INIT_LIBFUNCS
 134 #define TARGET_INIT_LIBFUNCS  sh_init_sync_libfuncs
 135
 136 #undef SUBTARGET_OVERRIDE_OPTIONS
 137 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 138   do                                                                    \
 139     {                                                                   \
 140       /* Set default atomic model if it hasn't been specified.  */      \
 141       if (global_options_set.x_sh_atomic_model_str == 0)                \
 142         {                                                               \
 143           if (TARGET_SH3)                                               \
 144             sh_atomic_model_str = "soft-gusa";                          \
 145           else if (TARGET_SH1)                                          \
 146             sh_atomic_model_str = "soft-imask";                         \
 147         }                                                               \
 148       /* Set -musermode if it hasn't been specified.  */                \
 149       if (global_options_set.x_TARGET_USERMODE == 0)                    \
 150         TARGET_USERMODE = true;                                         \
 151     }                                                                   \
 152   while (0)