gcc/config/vxworks.c

   1 /* Common VxWorks target definitions for GNU compiler.
   2    Copyright (C) 2007
   3    Free Software Foundation, Inc.
   4    Contributed by CodeSourcery, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 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 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "target.h"
  26 #include "toplev.h"
  27 #include "output.h"
  28 #include "tm.h"
  29
  30 /* Like default_named_section_asm_out_constructor, except that even
  31    constructors with DEFAULT_INIT_PRIORITY must go in a numbered
  32    section on VxWorks.  The VxWorks runtime uses a clever trick to get
  33    the sentinel entry (-1) inserted at the beginning of the .ctors
  34    segment.  This trick will not work if we ever generate any entries
  35    in plain .ctors sections; we must always use .ctors.PRIORITY.  */
  36
  37 void
  38 vxworks_asm_out_constructor (rtx symbol, int priority)
  39 {
  40   section *sec;
  41
  42   sec = get_cdtor_priority_section (priority,
  43                                     /*constructor_p=*/true);
  44   assemble_addr_to_section (symbol, sec);
  45 }
  46
  47 /* See comment for vxworks_asm_out_constructor.  */
  48
  49 void
  50 vxworks_asm_out_destructor (rtx symbol, int priority)
  51 {
  52   section *sec;
  53
  54   sec = get_cdtor_priority_section (priority,
  55                                     /*constructor_p=*/false);
  56   assemble_addr_to_section (symbol, sec);
  57 }
  58
  59 /* Do VxWorks-specific parts of OVERRIDE_OPTIONS.  */
  60
  61 void
  62 vxworks_override_options (void)
  63 {
  64   /* We can use .ctors/.dtors sections only in RTP mode.  */
  65   targetm.have_ctors_dtors = TARGET_VXWORKS_RTP;
  66
  67   /* PIC is only supported for RTPs.  */
  68   if (flag_pic && !TARGET_VXWORKS_RTP)
  69     error ("PIC is only supported for RTPs");
  70 }