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 /* We're not SYSVR4, not having /usr/ccs */
  28 #undef MD_EXEC_PREFIX
  29 #undef MD_STARTFILE_PREFIX
  30
  31 /* This was defined in linux.h.  Define it here also.  */
  32 #define HANDLE_PRAGMA_PACK_PUSH_POP
  33
  34 /* Don't assume anything about the header files.  */
  35 #define NO_IMPLICIT_EXTERN_C
  36
  37 /* The GNU C++ standard library requires that these macros be defined.  */
  38 #undef CPLUSPLUS_CPP_SPEC
  39 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  40
  41 /* Enable DWARF 2 exceptions.  */
  42 #undef DWARF2_UNWIND_INFO
  43 #define DWARF2_UNWIND_INFO 1
  44
  45 #undef SUBTARGET_CPP_SPEC
  46 #define SUBTARGET_CPP_SPEC "\
  47    %{posix:-D_POSIX_SOURCE} \
  48    %{pthread:-D_REENTRANT -D_PTHREADS} \
  49 "
  50
  51 #define TARGET_OS_CPP_BUILTINS() \
  52 do { \
  53   builtin_define_std ("unix"); \
  54   builtin_define ("__gnu_linux__"); \
  55   builtin_define_std ("linux"); \
  56   builtin_assert ("system=linux"); \
  57   builtin_assert ("system=unix"); \
  58   builtin_assert ("system=posix"); \
  59 } while (0)
  60
  61 #undef TARGET_DEFAULT
  62 #define TARGET_DEFAULT \
  63   (TARGET_CPU_DEFAULT | USERMODE_BIT | TARGET_ENDIAN_DEFAULT)
  64
  65 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  66
  67 #undef SUBTARGET_LINK_EMUL_SUFFIX
  68 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  69 #undef SUBTARGET_LINK_SPEC
  70 #define SUBTARGET_LINK_SPEC \
  71   "%{shared:-shared} \
  72    %{!static: \
  73      %{rdynamic:-export-dynamic} \
  74      %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
  75    %{static:-static}"
  76
  77 #undef LIB_SPEC
  78 #define LIB_SPEC \
  79   "%{pthread:-lpthread} \
  80    %{shared: -lc} \
  81    %{!static:-rpath-link %R/lib:%R/usr/lib} \
  82    %{!shared: \
  83      %{mieee-fp:-lieee} \
  84      %{profile:-lc_p} %{!profile: -lc}}"
  85
  86 #if defined(HAVE_LD_EH_FRAME_HDR)
  87 #undef LINK_EH_SPEC
  88 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
  89 #endif
  90
  91 #undef STARTFILE_SPEC
  92 #if defined HAVE_LD_PIE
  93 #define STARTFILE_SPEC \
  94   "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
  95    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  96 #else
  97 #define STARTFILE_SPEC \
  98   "%{!shared: %{pg|p|profile:gcrt1.o%s;:crt1.o%s}} \
  99    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
 100 #endif
 101
 102 #undef  ENDFILE_SPEC
 103 #define ENDFILE_SPEC \
 104   "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
 105
 106 #define LINK_GCC_C_SEQUENCE_SPEC \
 107   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 108
 109 /* Use --as-needed -lgcc_s for eh support.  */
 110 #ifdef HAVE_LD_AS_NEEDED
 111 #define USE_LD_AS_NEEDED 1
 112 #endif
 113
 114 /* Determine whether the the entire c99 runtime
 115    is present in the runtime library.  */
 116 #define TARGET_C99_FUNCTIONS 1
 117
 118 /* Output assembler code to STREAM to call the profiler.  */
 119
 120 #undef FUNCTION_PROFILER
 121 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
 122   do {                                                                  \
 123     if (flag_pic)                                                       \
 124       {                                                                 \
 125         fprintf (STREAM, "\tmov.l\t3f,r1\n");                           \
 126         fprintf (STREAM, "\tmova\t3f,r0\n");                            \
 127         fprintf (STREAM, "\tadd\tr1,r0\n");                             \
 128         fprintf (STREAM, "\tmov.l\t1f,r1\n");                           \
 129         fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                     \
 130       }                                                                 \
 131     else                                                                \
 132       fprintf (STREAM, "\tmov.l\t1f,r1\n");                             \
 133     fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                            \
 134     fprintf (STREAM, "\tmova\t2f,r0\n");                                \
 135     fprintf (STREAM, "\tjmp\t@r1\n");                                   \
 136     fprintf (STREAM, "\tlds\tr0,pr\n");                                 \
 137     fprintf (STREAM, "\t.align\t2\n");                                  \
 138     if (flag_pic)                                                       \
 139       {                                                                 \
 140         fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                    \
 141         fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");         \
 142       }                                                                 \
 143     else                                                                \
 144       fprintf (STREAM, "1:\t.long\tmcount\n");                          \
 145     fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                          \
 146   } while (0)
 147
 148 #define MD_UNWIND_SUPPORT "config/sh/linux-unwind.h"
 149
 150 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 151    to a fake register number 16 as a placeholder for the return address
 152    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 153    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 154    the register.  So the entry of dwarf_reg_size_table corresponding to
 155    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 156    so as to return itself for 16.  */
 157 #undef DBX_REGISTER_NUMBER
 158 #define DBX_REGISTER_NUMBER(REGNO) \
 159   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))