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, 2006, 2007, 2010, 2011
   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 3, 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 GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* Run-time Target Specification.  */
  23
  24 /* Enable DWARF 2 exceptions.  */
  25 #undef DWARF2_UNWIND_INFO
  26 #define DWARF2_UNWIND_INFO 1
  27
  28 #undef SUBTARGET_CPP_SPEC
  29 #define SUBTARGET_CPP_SPEC "\
  30    %{posix:-D_POSIX_SOURCE} \
  31    %{pthread:-D_REENTRANT -D_PTHREADS} \
  32 "
  33
  34 #define TARGET_OS_CPP_BUILTINS() \
  35   do                                            \
  36     {                                           \
  37       GNU_USER_TARGET_OS_CPP_BUILTINS();        \
  38     }                                           \
  39   while (0)
  40
  41 #undef TARGET_DEFAULT
  42 #define TARGET_DEFAULT \
  43   (TARGET_CPU_DEFAULT | MASK_USERMODE | TARGET_ENDIAN_DEFAULT \
  44    | TARGET_OPT_DEFAULT)
  45
  46 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  47
  48 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  49
  50 #undef SUBTARGET_LINK_EMUL_SUFFIX
  51 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  52 #undef SUBTARGET_LINK_SPEC
  53 #define SUBTARGET_LINK_SPEC \
  54   "%{shared:-shared} \
  55    %{!static: \
  56      %{rdynamic:-export-dynamic} \
  57      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  58    %{static:-static}"
  59
  60 /* Output assembler code to STREAM to call the profiler.  */
  61
  62 #undef FUNCTION_PROFILER
  63 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  64   do {                                                                  \
  65     if (TARGET_SHMEDIA)                                                 \
  66       {                                                                 \
  67         fprintf (STREAM, "\tpt\t1f,tr1\n");                             \
  68         fprintf (STREAM, "\taddi.l\tr15,-8,r15\n");                     \
  69         fprintf (STREAM, "\tst.l\tr15,0,r18\n");                        \
  70         if (flag_pic)                                                   \
  71           {                                                             \
  72             const char *gofs = "(datalabel _GLOBAL_OFFSET_TABLE_-(0f-.))"; \
  73             fprintf (STREAM, "\tmovi\t((%s>>16)&0xffff),r21\n", gofs);  \
  74             fprintf (STREAM, "\tshori\t(%s & 0xffff),r21\n", gofs);     \
  75             fprintf (STREAM, "0:\tptrel/u\tr21,tr0\n");                 \
  76             fprintf (STREAM, "\tmovi\t((mcount@GOTPLT)&0xffff),r22\n"); \
  77             fprintf (STREAM, "\tgettr\ttr0,r21\n");                     \
  78             fprintf (STREAM, "\tadd.l\tr21,r22,r21\n");                 \
  79             fprintf (STREAM, "\tld.l\tr21,0,r21\n");                    \
  80             fprintf (STREAM, "\tptabs\tr21,tr0\n");                     \
  81           }                                                             \
  82         else                                                            \
  83           fprintf (STREAM, "\tpt\tmcount,tr0\n");                       \
  84         fprintf (STREAM, "\tgettr\ttr1,r18\n");                         \
  85         fprintf (STREAM, "\tblink\ttr0,r63\n");                         \
  86         fprintf (STREAM, "1:\tld.l\tr15,0,r18\n");                      \
  87         fprintf (STREAM, "\taddi.l\tr15,8,r15\n");                      \
  88       }                                                                 \
  89     else                                                                \
  90       {                                                                 \
  91         if (flag_pic)                                                   \
  92           {                                                             \
  93             fprintf (STREAM, "\tmov.l\t3f,r1\n");                       \
  94             fprintf (STREAM, "\tmova\t3f,r0\n");                        \
  95             fprintf (STREAM, "\tadd\tr1,r0\n");                         \
  96             fprintf (STREAM, "\tmov.l\t1f,r1\n");                       \
  97             fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                 \
  98           }                                                             \
  99         else                                                            \
 100           fprintf (STREAM, "\tmov.l\t1f,r1\n");                         \
 101         fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                        \
 102         fprintf (STREAM, "\tmova\t2f,r0\n");                            \
 103         fprintf (STREAM, "\tjmp\t@r1\n");                               \
 104         fprintf (STREAM, "\tlds\tr0,pr\n");                             \
 105         fprintf (STREAM, "\t.align\t2\n");                              \
 106         if (flag_pic)                                                   \
 107           {                                                             \
 108             fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                \
 109             fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");     \
 110           }                                                             \
 111         else                                                            \
 112           fprintf (STREAM, "1:\t.long\tmcount\n");                      \
 113         fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                      \
 114       }                                                                 \
 115   } while (0)
 116
 117 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 118    to a fake register number 16 as a placeholder for the return address
 119    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 120    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 121    the register.  So the entry of dwarf_reg_size_table corresponding to
 122    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 123    so as to return itself for 16.  */
 124 #undef DBX_REGISTER_NUMBER
 125 #define DBX_REGISTER_NUMBER(REGNO) \
 126   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))
 127
 128 /* Since libgcc is compiled with -fpic for this target, we can't use
 129    __sdivsi3_1 as the division strategy for -O0 and -Os.  */
 130 #undef SH_DIV_STRATEGY_DEFAULT
 131 #define SH_DIV_STRATEGY_DEFAULT SH_DIV_CALL2
 132 #undef SH_DIV_STR_FOR_SIZE
 133 #define SH_DIV_STR_FOR_SIZE "call2"