ld/emultempl/mmix-elfnmmo.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GLD, the Gnu Linker.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 #
  20
  21 # This file is sourced from elf32.em and mmo.em, used to define
  22 # MMIX-specific things common to ELF and MMO.
  23
  24 cat >>e${EMULATION_NAME}.c <<EOF
  25 #include "elf/mmix.h"
  26
  27 /* Set up handling of linker-allocated global registers.  */
  28
  29 static void
  30 mmix_before_allocation (void)
  31 {
  32   /* Call the default first.  */
  33   gld${EMULATION_NAME}_before_allocation ();
  34
  35   /* There's a needrelax.em which uses this ..._before_allocation-hook and
  36      just has the statement below as payload.  It's more of a hassle to
  37      use that than to just include these two lines and take the
  38      maintenance burden to keep them in sync.  (Of course we lose the
  39      maintenance burden of checking that it still does what we need.)  */
  40
  41   /* Force -relax on if not doing a relocatable link.  */
  42   if (! link_info.relocatable)
  43     command_line.relax = TRUE;
  44
  45   if (!_bfd_mmix_prepare_linker_allocated_gregs (output_bfd, &link_info))
  46     einfo ("%X%P: Internal problems setting up section %s",
  47            MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
  48 }
  49
  50 /* We need to set the VMA of the .MMIX.reg_contents section when it has
  51    been allocated, and produce the final settings for the linker-generated
  52    GREGs.  */
  53
  54 static void
  55 mmix_after_allocation (void)
  56 {
  57   asection *sec
  58     = bfd_get_section_by_name (output_bfd, MMIX_REG_CONTENTS_SECTION_NAME);
  59   bfd_signed_vma regvma;
  60
  61   /* If there's no register section, we don't need to do anything.  On the
  62      other hand, if there's a non-standard linker-script without a mapping
  63      from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is
  64      present (as in the ld test "NOCROSSREFS 2"), that section (1) will be
  65      orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we
  66      will not do the necessary preparations for those relocations that
  67      caused it to be created.  We'll SEGV from the latter error.  The
  68      former error in separation will result in a non-working binary, but
  69      that's expected when you play tricks with linker scripts.  The
  70      "NOCROSSREFS 2" test does not run the output so it does not matter
  71      there.  */
  72   if (sec == NULL)
  73     sec
  74       = bfd_get_section_by_name (output_bfd,
  75                                  MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
  76   if (sec == NULL)
  77     return;
  78
  79   regvma = 256 * 8 - sec->_raw_size - 8;
  80
  81   /* If we start on a local register, we have too many global registers.
  82      We treat this error as nonfatal (meaning processing will continue in
  83      search for other errors), because it's a link error in the same way
  84      as an undefined symbol.  */
  85   if (regvma < 32 * 8)
  86     {
  87       einfo ("%X%P: Too many global registers: %u, max 223\n",
  88              (unsigned) sec->_raw_size / 8);
  89       regvma = 32 * 8;
  90     }
  91
  92   /* Set vma to correspond to first such register number * 8.  */
  93   bfd_set_section_vma (output_bfd, sec, (bfd_vma) regvma);
  94
  95   /* ??? Why isn't the section size (_cooked_size) set?  Doesn't it get
  96      set regardless of presence of relocations?  */
  97   if (sec->_cooked_size == 0
  98       && ! bfd_set_section_size (output_bfd, sec, sec->_raw_size))
  99     {
 100       /* This is a fatal error; make the einfo call not return.  */
 101       einfo ("%F%P: Can't set section %s size to %u\n",
 102              MMIX_REG_CONTENTS_SECTION_NAME, (unsigned) sec->_raw_size);
 103     }
 104
 105   /* Simplify symbol output for the register section (without contents;
 106      created for register symbols) by setting the output offset to 0.
 107      This section is only present when there are register symbols.  */
 108   sec = bfd_get_section_by_name (output_bfd, MMIX_REG_SECTION_NAME);
 109   if (sec != NULL)
 110     bfd_set_section_vma (abfd, sec, 0);
 111
 112   if (!_bfd_mmix_finalize_linker_allocated_gregs (output_bfd, &link_info))
 113     {
 114       /* This is a fatal error; make einfo call not return.  */
 115       einfo ("%F%P: Can't finalize linker-allocated global registers\n");
 116     }
 117 }
 118 EOF
 119
 120 LDEMUL_AFTER_ALLOCATION=mmix_after_allocation
 121 LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation