1# This shell script emits a C file. -*- C -*-
2#   Copyright (C) 2001-2016 Free Software Foundation, Inc.
3#
4# This file is part of the GNU Binutils.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
19# MA 02110-1301, USA.
20#
21
22# This file is sourced from elf32.em and mmo.em, used to define
23# MMIX-specific things common to ELF and MMO.
24
25fragment <<EOF
26#include "elf/mmix.h"
27
28/* Set up handling of linker-allocated global registers.  */
29
30static void
31mmix_before_allocation (void)
32{
33  /* Call the default first.  */
34  gld${EMULATION_NAME}_before_allocation ();
35
36  /* There's a needrelax.em which uses this ..._before_allocation-hook and
37     just has the statement below as payload.  It's more of a hassle to
38     use that than to just include these two lines and take the
39     maintenance burden to keep them in sync.  (Of course we lose the
40     maintenance burden of checking that it still does what we need.)  */
41
42  /* Force -relax on (regardless of whether we're doing a relocatable
43     link).  */
44  ENABLE_RELAXATION;
45
46  if (!_bfd_mmix_before_linker_allocation (link_info.output_bfd, &link_info))
47    einfo ("%X%P: Internal problems setting up section %s",
48	   MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
49}
50
51/* We need to set the VMA of the .MMIX.reg_contents section when it has
52   been allocated, and produce the final settings for the linker-generated
53   GREGs.  */
54
55static void
56mmix_after_allocation (void)
57{
58  asection *sec;
59  bfd_signed_vma regvma;
60
61  gld${EMULATION_NAME}_after_allocation ();
62
63  /* If there's no register section, we don't need to do anything.  On the
64     other hand, if there's a non-standard linker-script without a mapping
65     from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is
66     present (as in the ld test "NOCROSSREFS 2"), that section (1) will be
67     orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we
68     will not do the necessary preparations for those relocations that
69     caused it to be created.  We'll SEGV from the latter error.  The
70     former error in separation will result in a non-working binary, but
71     that's expected when you play tricks with linker scripts.  The
72     "NOCROSSREFS 2" test does not run the output so it does not matter
73     there.  */
74  sec = bfd_get_section_by_name (link_info.output_bfd,
75				 MMIX_REG_CONTENTS_SECTION_NAME);
76  if (sec == NULL)
77    sec
78      = bfd_get_section_by_name (link_info.output_bfd,
79				 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
80  if (sec == NULL)
81    return;
82
83  regvma = 256 * 8 - sec->size - 8;
84
85  /* If we start on a local register, we have too many global registers.
86     We treat this error as nonfatal (meaning processing will continue in
87     search for other errors), because it's a link error in the same way
88     as an undefined symbol.  */
89  if (regvma < 32 * 8)
90    {
91      einfo ("%X%P: Too many global registers: %u, max 223\n",
92	     (unsigned) sec->size / 8);
93      regvma = 32 * 8;
94    }
95
96  /* Set vma to correspond to first such register number * 8.  */
97  bfd_set_section_vma (link_info.output_bfd, sec, (bfd_vma) regvma);
98
99  /* Simplify symbol output for the register section (without contents;
100     created for register symbols) by setting the output offset to 0.
101     This section is only present when there are register symbols.  */
102  sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME);
103  if (sec != NULL)
104    bfd_set_section_vma (sec->owner, sec, 0);
105
106  if (!_bfd_mmix_after_linker_allocation (link_info.output_bfd, &link_info))
107    {
108      /* This is a fatal error; make einfo call not return.  */
109      einfo ("%F%P: Can't finalize linker-allocated global registers\n");
110    }
111}
112EOF
113
114LDEMUL_AFTER_ALLOCATION=mmix_after_allocation
115LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation
116