1# This shell script emits a C file. -*- C -*-
2# Copyright (C) 2007-2014 Free Software Foundation, Inc.
3# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com>
4#
5# This file is part of the GNU Binutils.
6#
7# This program 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 3 of the License, or
10# (at your option) any later version.
11#
12# This program 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; if not, write to the Free Software
19# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20# MA 02110-1301, USA.
21#
22
23# This file is sourced from elf32.em, and defines extra cr16-elf
24# specific routines.
25#
26fragment <<EOF
27
28#include "ldctor.h"
29
30static void check_sections (bfd *, asection *, void *);
31
32
33/* This function is run after all the input files have been opened.  */
34
35static void
36cr16_elf_after_open (void)
37{
38  /* Call the standard elf routine.  */
39  gld${EMULATION_NAME}_after_open ();
40
41   if (command_line.embedded_relocs
42       && (! link_info.relocatable))
43     {
44       bfd *abfd;
45
46      /* In the embedded relocs mode we create a .emreloc section for each
47	 input file with a nonzero .data section.  The BFD backend will fill in
48	 these sections with magic numbers which can be used to relocate the
49	 data section at run time.  */
50      for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
51	{
52	  asection *datasec;
53
54	  /* As first-order business, make sure that each input BFD is either
55	     COFF or ELF.  We need to call a special BFD backend function to
56	     generate the embedded relocs, and we have such functions only for
57	     COFF and ELF.  */
58	  if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
59	      && bfd_get_flavour (abfd) != bfd_target_elf_flavour)
60	    einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");
61
62	  datasec = bfd_get_section_by_name (abfd, ".data.rel");
63
64	  /* Note that we assume that the reloc_count field has already
65	     been set up.  We could call bfd_get_reloc_upper_bound, but
66	     that returns the size of a memory buffer rather than a reloc
67	     count.  We do not want to call bfd_canonicalize_reloc,
68	     because although it would always work it would force us to
69	     read in the relocs into BFD canonical form, which would waste
70	     a significant amount of time and memory.  */
71	  if (datasec != NULL && datasec->reloc_count > 0)
72	    {
73	      asection *relsec;
74
75	      relsec = bfd_make_section (abfd, ".emreloc");
76	      if (relsec == NULL
77		  || ! bfd_set_section_flags (abfd, relsec,
78					      (SEC_ALLOC
79					       | SEC_LOAD
80					       | SEC_HAS_CONTENTS
81					       | SEC_IN_MEMORY))
82		  || ! bfd_set_section_alignment (abfd, relsec, 2)
83		  || ! bfd_set_section_size (abfd, relsec,
84					     datasec->reloc_count * 8))
85		einfo ("%F%B: can not create .emreloc section: %E\n");
86	    }
87
88	  /* Double check that all other data sections are empty, as is
89	     required for embedded PIC code.  */
90	  bfd_map_over_sections (abfd, check_sections, datasec);
91	}
92    }
93}
94
95/* Check that of the data sections, only the .data section has
96   relocs.  This is called via bfd_map_over_sections.  */
97
98static void
99check_sections (bfd *abfd, asection *sec, void *datasec)
100{
101  if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)
102     && sec != datasec
103     && sec->reloc_count == 0 )
104    einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
105	   abfd, bfd_get_section_name (abfd, sec));
106}
107
108static void
109cr16elf_after_parse (void)
110{
111  /* Always behave as if called with --sort-common command line
112     option.
113     This is to emulate the CRTools' method of keeping variables
114     of different alignment in separate sections.  */
115  config.sort_common = TRUE;
116
117  /* Don't create a demand-paged executable, since this feature isn't
118     meaninful in CR16 embedded systems. Moreover, when magic_demand_paged
119     is true the link sometimes fails.  */
120  config.magic_demand_paged = FALSE;
121
122  after_parse_default ();
123}
124
125/* This is called after the sections have been attached to output
126   sections, but before any sizes or addresses have been set.  */
127
128static void
129cr16elf_before_allocation (void)
130{
131  /* Call the default first.  */
132  gld${EMULATION_NAME}_before_allocation ();
133
134   if (command_line.embedded_relocs
135       && (! link_info.relocatable))
136     {
137
138   bfd *abfd;
139
140   /* If we are generating embedded relocs, call a special BFD backend
141	 routine to do the work.  */
142   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
143      {
144	  asection *datasec, *relsec;
145	  char *errmsg;
146
147	  datasec = bfd_get_section_by_name (abfd, ".data.rel");
148
149	  if (datasec == NULL || datasec->reloc_count == 0)
150	    continue;
151
152	  relsec = bfd_get_section_by_name (abfd, ".emreloc");
153	  ASSERT (relsec != NULL);
154
155	  if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
156							   datasec, relsec,
157							   &errmsg))
158		{
159		  if (errmsg == NULL)
160		    einfo ("%B%X: can not create runtime reloc information: %E\n",
161			   abfd);
162		  else
163		    einfo ("%X%B: can not create runtime reloc information: %s\n",
164			   abfd, errmsg);
165		}
166       }
167     }
168
169  /* Enable relaxation by default if the "--no-relax" option was not
170     specified.  This is done here instead of in the before_parse hook
171     because there is a check in main() to prohibit use of --relax and
172     -r together.  */
173  if (RELAXATION_DISABLED_BY_DEFAULT)
174    ENABLE_RELAXATION;
175}
176
177EOF
178
179# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
180#
181LDEMUL_AFTER_OPEN=cr16_elf_after_open
182LDEMUL_AFTER_PARSE=cr16elf_after_parse
183LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation
184