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3d3d428f | 1 | # This shell script emits a C file. -*- C -*- |
97b11f40 | 2 | # Copyright 2007, 2008, 2009 Free Software Foundation, Inc. |
3d3d428f NC |
3 | # Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com> |
4 | # | |
f96b4a7b | 5 | # This file is part of the GNU Binutils. |
3d3d428f NC |
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 | |
f96b4a7b | 9 | # the Free Software Foundation; either version 3 of the License, or |
3d3d428f NC |
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 | |
f96b4a7b NC |
19 | # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | # MA 02110-1301, USA. | |
3d3d428f NC |
21 | # |
22 | ||
23 | # This file is sourced from elf32.em, and defines extra cr16-elf | |
24 | # specific routines. | |
25 | # | |
92b93329 | 26 | fragment <<EOF |
3d3d428f NC |
27 | |
28 | #include "ldctor.h" | |
29 | ||
30 | /* Flag for the emulation-specific "--no-relax" option. */ | |
31 | static bfd_boolean disable_relaxation = FALSE; | |
32 | ||
7251ccbf SR |
33 | static void check_sections (bfd *, asection *, void *); |
34 | ||
35 | ||
36 | /* This function is run after all the input files have been opened. */ | |
37 | ||
38 | static void | |
39 | cr16_elf_after_open (void) | |
40 | { | |
41 | /* Call the standard elf routine. */ | |
42 | gld${EMULATION_NAME}_after_open (); | |
43 | ||
44 | if (command_line.embedded_relocs | |
45 | && (! link_info.relocatable)) | |
46 | { | |
47 | bfd *abfd; | |
48 | ||
49 | /* In the embedded relocs mode we create a .emreloc section for each | |
50 | input file with a nonzero .data section. The BFD backend will fill in | |
51 | these sections with magic numbers which can be used to relocate the | |
52 | data section at run time. */ | |
53 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) | |
54 | { | |
55 | asection *datasec; | |
56 | ||
57 | /* As first-order business, make sure that each input BFD is either | |
58 | COFF or ELF. We need to call a special BFD backend function to | |
59 | generate the embedded relocs, and we have such functions only for | |
60 | COFF and ELF. */ | |
61 | if (bfd_get_flavour (abfd) != bfd_target_coff_flavour | |
62 | && bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
63 | einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n"); | |
64 | ||
65 | datasec = bfd_get_section_by_name (abfd, ".data.rel"); | |
66 | ||
67 | /* Note that we assume that the reloc_count field has already | |
68 | been set up. We could call bfd_get_reloc_upper_bound, but | |
69 | that returns the size of a memory buffer rather than a reloc | |
70 | count. We do not want to call bfd_canonicalize_reloc, | |
71 | because although it would always work it would force us to | |
72 | read in the relocs into BFD canonical form, which would waste | |
73 | a significant amount of time and memory. */ | |
74 | if (datasec != NULL && datasec->reloc_count > 0) | |
75 | { | |
76 | asection *relsec; | |
77 | ||
78 | relsec = bfd_make_section (abfd, ".emreloc"); | |
79 | if (relsec == NULL | |
80 | || ! bfd_set_section_flags (abfd, relsec, | |
81 | (SEC_ALLOC | |
82 | | SEC_LOAD | |
83 | | SEC_HAS_CONTENTS | |
84 | | SEC_IN_MEMORY)) | |
85 | || ! bfd_set_section_alignment (abfd, relsec, 2) | |
86 | || ! bfd_set_section_size (abfd, relsec, | |
87 | datasec->reloc_count * 8)) | |
88 | einfo ("%F%B: can not create .emreloc section: %E\n"); | |
89 | } | |
90 | ||
91 | /* Double check that all other data sections are empty, as is | |
92 | required for embedded PIC code. */ | |
93 | bfd_map_over_sections (abfd, check_sections, datasec); | |
94 | } | |
95 | } | |
96 | } | |
97 | ||
98 | /* Check that of the data sections, only the .data section has | |
99 | relocs. This is called via bfd_map_over_sections. */ | |
100 | ||
101 | static void | |
102 | check_sections (bfd *abfd, asection *sec, void *datasec) | |
103 | { | |
104 | if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0) | |
105 | && sec != datasec | |
106 | && sec->reloc_count == 0 ) | |
107 | einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n", | |
108 | abfd, bfd_get_section_name (abfd, sec)); | |
109 | } | |
110 | ||
3d3d428f NC |
111 | static void |
112 | cr16elf_after_parse (void) | |
113 | { | |
114 | /* Always behave as if called with --sort-common command line | |
115 | option. | |
116 | This is to emulate the CRTools' method of keeping variables | |
117 | of different alignment in separate sections. */ | |
118 | config.sort_common = TRUE; | |
119 | ||
120 | /* Don't create a demand-paged executable, since this feature isn't | |
121 | meaninful in CR16 embedded systems. Moreover, when magic_demand_paged | |
122 | is true the link sometimes fails. */ | |
123 | config.magic_demand_paged = FALSE; | |
97b11f40 AM |
124 | |
125 | after_parse_default (); | |
3d3d428f NC |
126 | } |
127 | ||
128 | /* This is called after the sections have been attached to output | |
129 | sections, but before any sizes or addresses have been set. */ | |
130 | ||
131 | static void | |
132 | cr16elf_before_allocation (void) | |
133 | { | |
134 | /* Call the default first. */ | |
135 | gld${EMULATION_NAME}_before_allocation (); | |
136 | ||
7251ccbf SR |
137 | if (command_line.embedded_relocs |
138 | && (! link_info.relocatable)) | |
139 | { | |
140 | ||
141 | bfd *abfd; | |
142 | ||
143 | /* If we are generating embedded relocs, call a special BFD backend | |
144 | routine to do the work. */ | |
145 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) | |
146 | { | |
147 | asection *datasec, *relsec; | |
148 | char *errmsg; | |
149 | ||
150 | datasec = bfd_get_section_by_name (abfd, ".data.rel"); | |
151 | ||
152 | if (datasec == NULL || datasec->reloc_count == 0) | |
153 | continue; | |
154 | ||
155 | relsec = bfd_get_section_by_name (abfd, ".emreloc"); | |
156 | ASSERT (relsec != NULL); | |
157 | ||
158 | if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info, | |
159 | datasec, relsec, | |
160 | &errmsg)) | |
161 | { | |
162 | if (errmsg == NULL) | |
163 | einfo ("%B%X: can not create runtime reloc information: %E\n", | |
164 | abfd); | |
165 | else | |
166 | einfo ("%X%B: can not create runtime reloc information: %s\n", | |
167 | abfd, errmsg); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
3d3d428f NC |
172 | /* Enable relaxation by default if the "--no-relax" option was not |
173 | specified. This is done here instead of in the before_parse hook | |
174 | because there is a check in main() to prohibit use of --relax and | |
175 | -r together. */ | |
176 | ||
177 | if (!disable_relaxation) | |
178 | command_line.relax = TRUE; | |
179 | } | |
180 | ||
181 | EOF | |
182 | ||
183 | # Define some shell vars to insert bits of code into the standard elf | |
184 | # parse_args and list_options functions. | |
185 | # | |
186 | PARSE_AND_LIST_PROLOGUE=' | |
187 | #define OPTION_NO_RELAX 301 | |
188 | ' | |
189 | ||
190 | PARSE_AND_LIST_LONGOPTS=' | |
191 | { "no-relax", no_argument, NULL, OPTION_NO_RELAX}, | |
192 | ' | |
193 | ||
194 | PARSE_AND_LIST_OPTIONS=' | |
195 | fprintf (file, _(" --no-relax Do not relax branches\n")); | |
196 | ' | |
197 | ||
198 | PARSE_AND_LIST_ARGS_CASES=' | |
199 | case OPTION_NO_RELAX: | |
200 | disable_relaxation = TRUE; | |
201 | break; | |
202 | ' | |
203 | ||
204 | # Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation | |
205 | # | |
7251ccbf | 206 | LDEMUL_AFTER_OPEN=cr16_elf_after_open |
3d3d428f NC |
207 | LDEMUL_AFTER_PARSE=cr16elf_after_parse |
208 | LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation |