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 | MASK_USERMODE | TARGET_ENDIAN_DEFAULT \
  43    | TARGET_OPT_DEFAULT)
  44
  45 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  46
  47 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  48
  49 #undef SUBTARGET_LINK_EMUL_SUFFIX
  50 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  51 #undef SUBTARGET_LINK_SPEC
  52 #define SUBTARGET_LINK_SPEC \
  53   "%{shared:-shared} \
  54    %{!static: \
  55      %{rdynamic:-export-dynamic} \
  56      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  57    %{static:-static}"
  58
  59 /* Output assembler code to STREAM to call the profiler.  */
  60 #undef FUNCTION_PROFILER
  61 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  62   do {                                                                  \
  63     if (TARGET_SHMEDIA)                                                 \
  64       {                                                                 \
  65         fprintf (STREAM, "\tpt\t1f,tr1\n");                             \
  66         fprintf (STREAM, "\taddi.l\tr15,-8,r15\n");                     \
  67         fprintf (STREAM, "\tst.l\tr15,0,r18\n");                        \
  68         if (flag_pic)                                                   \
  69           {                                                             \
  70             const char *gofs = "(datalabel _GLOBAL_OFFSET_TABLE_-(0f-.))"; \
  71             fprintf (STREAM, "\tmovi\t((%s>>16)&0xffff),r21\n", gofs);  \
  72             fprintf (STREAM, "\tshori\t(%s & 0xffff),r21\n", gofs);     \
  73             fprintf (STREAM, "0:\tptrel/u\tr21,tr0\n");                 \
  74             fprintf (STREAM, "\tmovi\t((mcount@GOTPLT)&0xffff),r22\n"); \
  75             fprintf (STREAM, "\tgettr\ttr0,r21\n");                     \
  76             fprintf (STREAM, "\tadd.l\tr21,r22,r21\n");                 \
  77             fprintf (STREAM, "\tld.l\tr21,0,r21\n");                    \
  78             fprintf (STREAM, "\tptabs\tr21,tr0\n");                     \
  79           }                                                             \
  80         else                                                            \
  81           fprintf (STREAM, "\tpt\tmcount,tr0\n");                       \
  82         fprintf (STREAM, "\tgettr\ttr1,r18\n");                         \
  83         fprintf (STREAM, "\tblink\ttr0,r63\n");                         \
  84         fprintf (STREAM, "1:\tld.l\tr15,0,r18\n");                      \
  85         fprintf (STREAM, "\taddi.l\tr15,8,r15\n");                      \
  86       }                                                                 \
  87     else                                                                \
  88       {                                                                 \
  89         if (flag_pic)                                                   \
  90           {                                                             \
  91             fprintf (STREAM, "\tmov.l\t3f,r1\n");                       \
  92             fprintf (STREAM, "\tmova\t3f,r0\n");                        \
  93             fprintf (STREAM, "\tadd\tr1,r0\n");                         \
  94             fprintf (STREAM, "\tmov.l\t1f,r1\n");                       \
  95             fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                 \
  96           }                                                             \
  97         else                                                            \
  98           fprintf (STREAM, "\tmov.l\t1f,r1\n");                         \
  99         fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                        \
 100         fprintf (STREAM, "\tmova\t2f,r0\n");                            \
 101         fprintf (STREAM, "\tjmp\t@r1\n");                               \
 102         fprintf (STREAM, "\tlds\tr0,pr\n");                             \
 103         fprintf (STREAM, "\t.align\t2\n");                              \
 104         if (flag_pic)                                                   \
 105           {                                                             \
 106             fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                \
 107             fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");     \
 108           }                                                             \
 109         else                                                            \
 110           fprintf (STREAM, "1:\t.long\tmcount\n");                      \
 111         fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                      \
 112       }                                                                 \
 113   } while (0)
 114
 115 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 116    to a fake register number 16 as a placeholder for the return address
 117    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 118    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 119    the register.  So the entry of dwarf_reg_size_table corresponding to
 120    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 121    so as to return itself for 16.  */
 122 #undef DBX_REGISTER_NUMBER
 123 #define DBX_REGISTER_NUMBER(REGNO) \
 124   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))
 125
 126 /* Since libgcc is compiled with -fpic for this target, we can't use
 127    __sdivsi3_1 as the division strategy for -O0 and -Os.  */
 128 #undef SH_DIV_STRATEGY_DEFAULT
 129 #define SH_DIV_STRATEGY_DEFAULT SH_DIV_CALL2
 130 #undef SH_DIV_STR_FOR_SIZE
 131 #define SH_DIV_STR_FOR_SIZE "call2"
 132
 133 /* Install the __sync libcalls.  */
 134 #undef TARGET_INIT_LIBFUNCS
 135 #define TARGET_INIT_LIBFUNCS  sh_init_sync_libfuncs
 136
 137 #undef SUBTARGET_OVERRIDE_OPTIONS
 138 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 139   do                                                                    \
 140     {                                                                   \
 141       /* Set default atomic model if it hasn't been specified.  */      \
 142       if (global_options_set.x_sh_atomic_model_str == 0)                \
 143         {                                                               \
 144           if (TARGET_SH3)                                               \
 145             sh_atomic_model_str = "soft-gusa";                          \
 146           else if (TARGET_SH1)                                          \
 147             sh_atomic_model_str = "soft-imask";                         \
 148         }                                                               \
 149     }                                                                   \
 150   while (0)