gcc/config/sh/linux.h

   1 /* Definitions for SH running Linux-based GNU systems using ELF
   2    Copyright (C) 1999, 2000, 2002, 2003, 2004 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 2, 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 this program; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Run-time Target Specification.  */
  23 #undef TARGET_VERSION
  24 #define TARGET_VERSION  fputs (" (SH GNU/Linux with ELF)", stderr);
  25
  26 /* We're not SYSVR4, not having /usr/ccs */
  27 #undef MD_EXEC_PREFIX
  28 #undef MD_STARTFILE_PREFIX
  29
  30 /* This was defined in linux.h.  Define it here also.  */
  31 #define HANDLE_PRAGMA_PACK_PUSH_POP
  32
  33 /* Don't assume anything about the header files.  */
  34 #define NO_IMPLICIT_EXTERN_C
  35
  36 /* The GNU C++ standard library requires that these macros be defined.  */
  37 #undef CPLUSPLUS_CPP_SPEC
  38 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  39
  40 /* Enable DWARF 2 exceptions.  */
  41 #undef DWARF2_UNWIND_INFO
  42 #define DWARF2_UNWIND_INFO 1
  43
  44 #undef SUBTARGET_CPP_SPEC
  45 #define SUBTARGET_CPP_SPEC "\
  46    %{posix:-D_POSIX_SOURCE} \
  47    %{pthread:-D_REENTRANT -D_PTHREADS} \
  48 "
  49
  50 #define TARGET_OS_CPP_BUILTINS() \
  51 do { \
  52   builtin_define_std ("unix"); \
  53   builtin_define ("__gnu_linux__"); \
  54   builtin_define_std ("linux"); \
  55   builtin_assert ("system=linux"); \
  56   builtin_assert ("system=unix"); \
  57   builtin_assert ("system=posix"); \
  58 } while (0)
  59
  60 #undef TARGET_DEFAULT
  61 #define TARGET_DEFAULT \
  62   (TARGET_CPU_DEFAULT | USERMODE_BIT | TARGET_ENDIAN_DEFAULT)
  63
  64 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  65
  66 #undef SUBTARGET_LINK_EMUL_SUFFIX
  67 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  68 #undef SUBTARGET_LINK_SPEC
  69 #define SUBTARGET_LINK_SPEC \
  70   "%{shared:-shared} \
  71    %{!static: \
  72      %{rdynamic:-export-dynamic} \
  73      %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
  74    %{static:-static}"
  75
  76 #undef LIB_SPEC
  77 #define LIB_SPEC \
  78   "%{pthread:-lpthread} \
  79    %{shared: -lc} \
  80    %{!static:-rpath-link %R/lib:%R/usr/lib} \
  81    %{!shared: \
  82      %{mieee-fp:-lieee} \
  83      %{profile:-lc_p} %{!profile: -lc}}"
  84
  85 #if defined(HAVE_LD_EH_FRAME_HDR)
  86 #undef LINK_EH_SPEC
  87 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
  88 #endif
  89
  90 #undef STARTFILE_SPEC
  91 #if defined HAVE_LD_PIE
  92 #define STARTFILE_SPEC \
  93   "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
  94    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  95 #else
  96 #define STARTFILE_SPEC \
  97   "%{!shared: %{pg|p|profile:gcrt1.o%s;:crt1.o%s}} \
  98    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  99 #endif
 100
 101 #undef  ENDFILE_SPEC
 102 #define ENDFILE_SPEC \
 103   "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
 104
 105 #define LINK_GCC_C_SEQUENCE_SPEC \
 106   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 107
 108 /* Use --as-needed -lgcc_s for eh support.  */
 109 #ifdef HAVE_LD_AS_NEEDED
 110 #define USE_LD_AS_NEEDED 1
 111 #endif
 112
 113 /* Output assembler code to STREAM to call the profiler.  */
 114
 115 #undef FUNCTION_PROFILER
 116 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
 117   do {                                                                  \
 118     if (flag_pic)                                                       \
 119       {                                                                 \
 120         fprintf (STREAM, "\tmov.l\t3f,r1\n");                           \
 121         fprintf (STREAM, "\tmova\t3f,r0\n");                            \
 122         fprintf (STREAM, "\tadd\tr1,r0\n");                             \
 123         fprintf (STREAM, "\tmov.l\t1f,r1\n");                           \
 124         fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                     \
 125       }                                                                 \
 126     else                                                                \
 127       fprintf (STREAM, "\tmov.l\t1f,r1\n");                             \
 128     fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                            \
 129     fprintf (STREAM, "\tmova\t2f,r0\n");                                \
 130     fprintf (STREAM, "\tjmp\t@r1\n");                                   \
 131     fprintf (STREAM, "\tlds\tr0,pr\n");                                 \
 132     fprintf (STREAM, "\t.align\t2\n");                                  \
 133     if (flag_pic)                                                       \
 134       {                                                                 \
 135         fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                    \
 136         fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");         \
 137       }                                                                 \
 138     else                                                                \
 139       fprintf (STREAM, "1:\t.long\tmcount\n");                          \
 140     fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                          \
 141   } while (0)
 142
 143 #define MD_UNWIND_SUPPORT "config/sh/linux-unwind.h"
 144
 145 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 146    to a fake register number 16 as a placeholder for the return address
 147    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 148    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 149    the register.  So the entry of dwarf_reg_size_table corresponding to
 150    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 151    so as to return itself for 16.  */
 152 #undef DBX_REGISTER_NUMBER
 153 #define DBX_REGISTER_NUMBER(REGNO) \
 154   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))