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