gcc/config/sh/linux.h

   1 /* Definitions for SH running Linux-based GNU systems using ELF
   2    Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005
   3    Free Software Foundation, Inc.
   4    Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 /* Run-time Target Specification.  */
  24 #undef TARGET_VERSION
  25 #define TARGET_VERSION  fputs (" (SH GNU/Linux with ELF)", stderr);
  26
  27 /* Enable DWARF 2 exceptions.  */
  28 #undef DWARF2_UNWIND_INFO
  29 #define DWARF2_UNWIND_INFO 1
  30
  31 #undef SUBTARGET_CPP_SPEC
  32 #define SUBTARGET_CPP_SPEC "\
  33    %{posix:-D_POSIX_SOURCE} \
  34    %{pthread:-D_REENTRANT -D_PTHREADS} \
  35 "
  36
  37 #define TARGET_OS_CPP_BUILTINS() \
  38   do                                            \
  39     {                                           \
  40       LINUX_TARGET_OS_CPP_BUILTINS();           \
  41       if (flag_pic)                             \
  42         {                                       \
  43           builtin_define ("__PIC__");           \
  44           builtin_define ("__pic__");           \
  45         }                                       \
  46     }                                           \
  47   while (0)
  48
  49 #undef TARGET_DEFAULT
  50 #define TARGET_DEFAULT \
  51   (TARGET_CPU_DEFAULT | USERMODE_BIT | TARGET_ENDIAN_DEFAULT)
  52
  53 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  54
  55 #undef SUBTARGET_LINK_EMUL_SUFFIX
  56 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  57 #undef SUBTARGET_LINK_SPEC
  58 #define SUBTARGET_LINK_SPEC \
  59   "%{shared:-shared} \
  60    %{!static: \
  61      %{rdynamic:-export-dynamic} \
  62      %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
  63    %{static:-static}"
  64
  65 /* Output assembler code to STREAM to call the profiler.  */
  66
  67 #undef FUNCTION_PROFILER
  68 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  69   do {                                                                  \
  70     if (flag_pic)                                                       \
  71       {                                                                 \
  72         fprintf (STREAM, "\tmov.l\t3f,r1\n");                           \
  73         fprintf (STREAM, "\tmova\t3f,r0\n");                            \
  74         fprintf (STREAM, "\tadd\tr1,r0\n");                             \
  75         fprintf (STREAM, "\tmov.l\t1f,r1\n");                           \
  76         fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                     \
  77       }                                                                 \
  78     else                                                                \
  79       fprintf (STREAM, "\tmov.l\t1f,r1\n");                             \
  80     fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                            \
  81     fprintf (STREAM, "\tmova\t2f,r0\n");                                \
  82     fprintf (STREAM, "\tjmp\t@r1\n");                                   \
  83     fprintf (STREAM, "\tlds\tr0,pr\n");                                 \
  84     fprintf (STREAM, "\t.align\t2\n");                                  \
  85     if (flag_pic)                                                       \
  86       {                                                                 \
  87         fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                    \
  88         fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");         \
  89       }                                                                 \
  90     else                                                                \
  91       fprintf (STREAM, "1:\t.long\tmcount\n");                          \
  92     fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                          \
  93   } while (0)
  94
  95 #define MD_UNWIND_SUPPORT "config/sh/linux-unwind.h"
  96
  97 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
  98    to a fake register number 16 as a placeholder for the return address
  99    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 100    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 101    the register.  So the entry of dwarf_reg_size_table corresponding to
 102    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 103    so as to return itself for 16.  */
 104 #undef DBX_REGISTER_NUMBER
 105 #define DBX_REGISTER_NUMBER(REGNO) \
 106   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))