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1 | # This shell script emits a C file. -*- C -*- |
2 | # Copyright 2006 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 along | |
17 | # with this program; if not, write to the Free Software Foundation, Inc., | |
18 | # 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | # | |
20 | ||
21 | # This file is sourced from elf32.em, and defines extra spu specific | |
22 | # features. | |
23 | # | |
24 | cat >>e${EMULATION_NAME}.c <<EOF | |
25 | #include "ldctor.h" | |
26 | #include "elf32-spu.h" | |
27 | ||
28 | /* Non-zero if no overlay processing should be done. */ | |
29 | static int no_overlays = 0; | |
30 | ||
31 | /* Non-zero if we want stubs on all calls out of overlay regions. */ | |
32 | static int non_overlay_stubs = 0; | |
33 | ||
34 | /* Whether to emit symbols for stubs. */ | |
35 | static int emit_stub_syms = 0; | |
36 | ||
37 | /* Range of valid addresses for loadable sections. */ | |
38 | static bfd_vma local_store_lo = 0; | |
39 | static bfd_vma local_store_hi = 0x3ffff; | |
40 | ||
41 | extern void *_binary_builtin_ovl_mgr_start; | |
42 | extern void *_binary_builtin_ovl_mgr_end; | |
43 | ||
44 | static const struct _ovl_stream ovl_mgr_stream = { | |
45 | &_binary_builtin_ovl_mgr_start, | |
46 | &_binary_builtin_ovl_mgr_end | |
47 | }; | |
48 | ||
49 | static asection *toe = NULL; | |
50 | ||
51 | ||
52 | static int | |
53 | is_spu_target (void) | |
54 | { | |
55 | extern const bfd_target bfd_elf32_spu_vec; | |
56 | ||
57 | return link_info.hash->creator == &bfd_elf32_spu_vec; | |
58 | } | |
59 | ||
60 | /* Create our note section. */ | |
61 | ||
62 | static void | |
63 | spu_after_open (void) | |
64 | { | |
65 | if (is_spu_target () | |
66 | && !link_info.relocatable | |
67 | && link_info.input_bfds != NULL | |
68 | && !spu_elf_create_sections (output_bfd, &link_info)) | |
69 | einfo ("%X%P: can not create note section: %E\n"); | |
70 | ||
71 | gld${EMULATION_NAME}_after_open (); | |
72 | } | |
73 | ||
74 | /* Add section S at the end of output section OUTPUT_NAME. | |
75 | ||
76 | Really, we should be duplicating ldlang.c map_input_to_output_sections | |
77 | logic here, ie. using the linker script to find where the section | |
78 | goes. That's rather a lot of code, and we don't want to run | |
79 | map_input_to_output_sections again because most sections are already | |
80 | mapped. So cheat, and put the section in a fixed place, ignoring any | |
81 | attempt via a linker script to put .stub, .ovtab, and built-in | |
82 | overlay manager code somewhere else. */ | |
83 | ||
84 | static void | |
85 | spu_place_special_section (asection *s, const char *output_name) | |
86 | { | |
87 | lang_output_section_statement_type *os; | |
88 | ||
89 | os = lang_output_section_find (output_name); | |
90 | if (os == NULL) | |
91 | { | |
92 | const char *save = s->name; | |
93 | s->name = output_name; | |
94 | gld${EMULATION_NAME}_place_orphan (s); | |
95 | s->name = save; | |
96 | } | |
97 | else | |
98 | lang_add_section (&os->children, s, os); | |
99 | ||
100 | s->output_section->size += s->size; | |
101 | } | |
102 | ||
103 | /* Load built-in overlay manager, and tweak overlay section alignment. */ | |
104 | ||
105 | static void | |
106 | spu_elf_load_ovl_mgr (void) | |
107 | { | |
108 | lang_output_section_statement_type *os; | |
109 | struct elf_link_hash_entry *h; | |
110 | ||
111 | h = elf_link_hash_lookup (elf_hash_table (&link_info), | |
112 | "__ovly_load", FALSE, FALSE, FALSE); | |
113 | ||
114 | if (h != NULL | |
115 | && (h->root.type == bfd_link_hash_defined | |
116 | || h->root.type == bfd_link_hash_defweak) | |
117 | && h->def_regular) | |
118 | { | |
119 | /* User supplied __ovly_load. */ | |
120 | } | |
121 | else | |
122 | { | |
123 | lang_input_statement_type *ovl_is; | |
124 | ||
125 | ovl_is = lang_add_input_file ("builtin ovl_mgr", | |
126 | lang_input_file_is_file_enum, | |
127 | NULL); | |
128 | ||
129 | if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream)) | |
130 | einfo ("%X%P: can not open built-in overlay manager: %E\n"); | |
131 | else | |
132 | { | |
133 | asection *in; | |
134 | ||
135 | if (!load_symbols (ovl_is, NULL)) | |
136 | einfo ("%X%P: can not load built-in overlay manager: %E\n"); | |
137 | ||
138 | /* Map overlay manager sections to output sections. */ | |
139 | for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next) | |
140 | if ((in->flags & (SEC_ALLOC | SEC_LOAD)) | |
141 | == (SEC_ALLOC | SEC_LOAD)) | |
142 | spu_place_special_section (in, ".text"); | |
143 | } | |
144 | } | |
145 | ||
146 | /* Ensure alignment of overlay sections is sufficient. */ | |
147 | for (os = &lang_output_section_statement.head->output_section_statement; | |
148 | os != NULL; | |
149 | os = os->next) | |
150 | if (os->bfd_section != NULL | |
151 | && spu_elf_section_data (os->bfd_section) != NULL | |
152 | && spu_elf_section_data (os->bfd_section)->ovl_index != 0) | |
153 | { | |
154 | if (os->bfd_section->alignment_power < 4) | |
155 | os->bfd_section->alignment_power = 4; | |
156 | ||
157 | /* Also ensure size rounds up. */ | |
158 | os->block_value = 16; | |
159 | } | |
160 | } | |
161 | ||
162 | /* Go find if we need to do anything special for overlays. */ | |
163 | ||
164 | static void | |
165 | spu_before_allocation (void) | |
166 | { | |
167 | if (is_spu_target () | |
168 | && !link_info.relocatable | |
169 | && !no_overlays) | |
170 | { | |
171 | /* Size the sections. This is premature, but we need to know the | |
172 | rough layout so that overlays can be found. */ | |
173 | expld.phase = lang_mark_phase_enum; | |
174 | expld.dataseg.phase = exp_dataseg_none; | |
175 | one_lang_size_sections_pass (NULL, TRUE); | |
176 | ||
177 | /* Find overlays by inspecting section vmas. */ | |
178 | if (spu_elf_find_overlays (output_bfd, &link_info)) | |
179 | { | |
180 | asection *stub, *ovtab; | |
181 | ||
182 | if (!spu_elf_size_stubs (output_bfd, &link_info, non_overlay_stubs, | |
183 | &stub, &ovtab, &toe)) | |
184 | einfo ("%X%P: can not size overlay stubs: %E\n"); | |
185 | ||
186 | if (stub != NULL) | |
187 | { | |
188 | spu_place_special_section (stub, ".text"); | |
189 | spu_place_special_section (ovtab, ".data"); | |
190 | spu_place_special_section (toe, ".toe"); | |
191 | ||
192 | spu_elf_load_ovl_mgr (); | |
193 | } | |
194 | } | |
195 | ||
196 | /* We must not cache anything from the preliminary sizing. */ | |
197 | lang_reset_memory_regions (); | |
198 | } | |
199 | ||
200 | gld${EMULATION_NAME}_before_allocation (); | |
201 | } | |
202 | ||
203 | /* Final emulation specific call. */ | |
204 | ||
205 | static void | |
206 | gld${EMULATION_NAME}_finish (void) | |
207 | { | |
208 | int need_laying_out; | |
209 | ||
210 | need_laying_out = bfd_elf_discard_info (output_bfd, &link_info); | |
211 | ||
212 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
213 | ||
214 | if (is_spu_target () && local_store_lo < local_store_hi) | |
215 | { | |
216 | asection *s; | |
217 | ||
218 | s = spu_elf_check_vma (output_bfd, local_store_lo, local_store_hi); | |
219 | if (s != NULL) | |
220 | einfo ("%X%P: %A exceeds local store range\n", s); | |
221 | } | |
222 | ||
223 | if (toe != NULL | |
224 | && !spu_elf_build_stubs (&link_info, | |
225 | emit_stub_syms || link_info.emitrelocations, | |
226 | toe)) | |
227 | einfo ("%X%P: can not build overlay stubs: %E\n"); | |
228 | ||
229 | finish_default (); | |
230 | } | |
231 | ||
232 | EOF | |
233 | ||
234 | # Define some shell vars to insert bits of code into the standard elf | |
235 | # parse_args and list_options functions. | |
236 | # | |
237 | PARSE_AND_LIST_PROLOGUE=' | |
238 | #define OPTION_SPU_PLUGIN 301 | |
239 | #define OPTION_SPU_NO_OVERLAYS (OPTION_SPU_PLUGIN + 1) | |
240 | #define OPTION_SPU_STUB_SYMS (OPTION_SPU_NO_OVERLAYS + 1) | |
241 | #define OPTION_SPU_NON_OVERLAY_STUBS (OPTION_SPU_STUB_SYMS + 1) | |
242 | #define OPTION_SPU_LOCAL_STORE (OPTION_SPU_NON_OVERLAY_STUBS + 1) | |
243 | ' | |
244 | ||
245 | PARSE_AND_LIST_LONGOPTS=' | |
246 | { "plugin", no_argument, NULL, OPTION_SPU_PLUGIN }, | |
247 | { "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS }, | |
248 | { "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS }, | |
249 | { "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS }, | |
250 | { "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE }, | |
251 | ' | |
252 | ||
253 | PARSE_AND_LIST_OPTIONS=' | |
254 | fprintf (file, _("\ | |
255 | --plugin Make SPU plugin.\n\ | |
256 | --no-overlays No overlay handling.\n\ | |
257 | --emit-stub-syms Add symbols on overlay call stubs.\n\ | |
258 | --extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\ | |
259 | --local-store=lo:hi Valid address range.\n" | |
260 | )); | |
261 | ' | |
262 | ||
263 | PARSE_AND_LIST_ARGS_CASES=' | |
264 | case OPTION_SPU_PLUGIN: | |
265 | spu_elf_plugin (1); | |
266 | break; | |
267 | ||
268 | case OPTION_SPU_NO_OVERLAYS: | |
269 | no_overlays = 1; | |
270 | break; | |
271 | ||
272 | case OPTION_SPU_STUB_SYMS: | |
273 | emit_stub_syms = 1; | |
274 | break; | |
275 | ||
276 | case OPTION_SPU_NON_OVERLAY_STUBS: | |
277 | non_overlay_stubs = 1; | |
278 | break; | |
279 | ||
280 | case OPTION_SPU_LOCAL_STORE: | |
281 | { | |
282 | char *end; | |
283 | local_store_lo = strtoul (optarg, &end, 0); | |
284 | if (*end == '\'':'\'') | |
285 | { | |
286 | local_store_hi = strtoul (end + 1, &end, 0); | |
287 | if (*end == 0) | |
288 | break; | |
289 | } | |
290 | einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg); | |
291 | } | |
292 | break; | |
293 | ' | |
294 | ||
295 | LDEMUL_AFTER_OPEN=spu_after_open | |
296 | LDEMUL_BEFORE_ALLOCATION=spu_before_allocation | |
297 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |