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[deliverable/binutils-gdb.git] / ld / emultempl / avrelf.em
1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2006-2014 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 defines extra avr-elf specific
23 # routines. It is used to generate the trampolines for the avr6 family
24 # of devices where one needs to address the issue that it is not possible
25 # to reach the whole program memory by using 16 bit pointers.
26
27 fragment <<EOF
28
29 #include "elf32-avr.h"
30 #include "ldctor.h"
31
32 /* The fake file and it's corresponding section meant to hold
33 the linker stubs if needed. */
34
35 static lang_input_statement_type *stub_file;
36 static asection *avr_stub_section;
37
38 /* Variables set by the command-line parameters and transfered
39 to the bfd without use of global shared variables. */
40
41 static bfd_boolean avr_no_stubs = FALSE;
42 static bfd_boolean avr_debug_relax = FALSE;
43 static bfd_boolean avr_debug_stubs = FALSE;
44 static bfd_boolean avr_replace_call_ret_sequences = TRUE;
45 static bfd_vma avr_pc_wrap_around = 0x10000000;
46
47 /* Transfers information to the bfd frontend. */
48
49 static void
50 avr_elf_set_global_bfd_parameters (void)
51 {
52 elf32_avr_setup_params (& link_info,
53 stub_file->the_bfd,
54 avr_stub_section,
55 avr_no_stubs,
56 avr_debug_stubs,
57 avr_debug_relax,
58 avr_pc_wrap_around,
59 avr_replace_call_ret_sequences);
60 }
61
62
63 /* Makes a conservative estimate of the trampoline section size that could
64 be corrected later on. */
65
66 static void
67 avr_elf_${EMULATION_NAME}_before_allocation (void)
68 {
69 int ret;
70
71 gld${EMULATION_NAME}_before_allocation ();
72
73 /* We only need stubs for avr6, avrxmega6, and avrxmega7. */
74 if (strcmp ("${EMULATION_NAME}","avr6")
75 && strcmp ("${EMULATION_NAME}","avrxmega6")
76 && strcmp ("${EMULATION_NAME}","avrxmega7") )
77 avr_no_stubs = TRUE;
78
79 avr_elf_set_global_bfd_parameters ();
80
81 /* If generating a relocatable output file, then
82 we don't have to generate the trampolines. */
83 if (link_info.relocatable)
84 avr_no_stubs = TRUE;
85
86 if (avr_no_stubs)
87 return;
88
89 ret = elf32_avr_setup_section_lists (link_info.output_bfd, &link_info);
90
91 if (ret < 0)
92 einfo ("%X%P: can not setup the input section list: %E\n");
93
94 if (ret <= 0)
95 return;
96
97 /* Call into the BFD backend to do the real "stub"-work. */
98 if (! elf32_avr_size_stubs (link_info.output_bfd, &link_info, TRUE))
99 einfo ("%X%P: can not size stub section: %E\n");
100 }
101
102 /* This is called before the input files are opened. We create a new
103 fake input file to hold the stub section and generate the section itself. */
104
105 static void
106 avr_elf_create_output_section_statements (void)
107 {
108 flagword flags;
109
110 stub_file = lang_add_input_file ("linker stubs",
111 lang_input_file_is_fake_enum,
112 NULL);
113
114 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
115 if (stub_file->the_bfd == NULL
116 || !bfd_set_arch_mach (stub_file->the_bfd,
117 bfd_get_arch (link_info.output_bfd),
118 bfd_get_mach (link_info.output_bfd)))
119 {
120 einfo ("%X%P: can not create stub BFD %E\n");
121 return;
122 }
123
124 /* Now we add the stub section. */
125
126 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
127 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
128 avr_stub_section = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
129 ".trampolines",
130 flags);
131 if (avr_stub_section == NULL)
132 goto err_ret;
133
134 avr_stub_section->alignment_power = 1;
135
136 ldlang_add_file (stub_file);
137
138 return;
139
140 err_ret:
141 einfo ("%X%P: can not make stub section: %E\n");
142 return;
143 }
144
145 /* Re-calculates the size of the stubs so that we won't waste space. */
146
147 static void
148 avr_elf_after_allocation (void)
149 {
150 if (!avr_no_stubs && ! RELAXATION_ENABLED)
151 {
152 /* If relaxing, elf32_avr_size_stubs will be called from
153 elf32_avr_relax_section. */
154 if (!elf32_avr_size_stubs (link_info.output_bfd, &link_info, TRUE))
155 einfo ("%X%P: can not size stub section: %E\n");
156 }
157
158 gld${EMULATION_NAME}_after_allocation ();
159
160 /* Now build the linker stubs. */
161 if (!avr_no_stubs)
162 {
163 if (!elf32_avr_build_stubs (&link_info))
164 einfo ("%X%P: can not build stubs: %E\n");
165 }
166 }
167
168 static void
169 avr_elf_before_parse (void)
170 {
171 /* Don't create a demand-paged executable, since this feature isn't
172 meaningful in AVR. */
173 config.magic_demand_paged = FALSE;
174
175 gld${EMULATION_NAME}_before_parse ();
176 }
177
178 EOF
179
180
181 PARSE_AND_LIST_PROLOGUE='
182
183 #define OPTION_NO_CALL_RET_REPLACEMENT 301
184 #define OPTION_PMEM_WRAP_AROUND 302
185 #define OPTION_NO_STUBS 303
186 #define OPTION_DEBUG_STUBS 304
187 #define OPTION_DEBUG_RELAX 305
188 '
189
190 PARSE_AND_LIST_LONGOPTS='
191 { "no-call-ret-replacement", no_argument,
192 NULL, OPTION_NO_CALL_RET_REPLACEMENT},
193 { "pmem-wrap-around", required_argument,
194 NULL, OPTION_PMEM_WRAP_AROUND},
195 { "no-stubs", no_argument,
196 NULL, OPTION_NO_STUBS},
197 { "debug-stubs", no_argument,
198 NULL, OPTION_DEBUG_STUBS},
199 { "debug-relax", no_argument,
200 NULL, OPTION_DEBUG_RELAX},
201 '
202
203 PARSE_AND_LIST_OPTIONS='
204 fprintf (file, _(" --pmem-wrap-around=<val> "
205 "Make the linker relaxation machine assume that a\n"
206 " "
207 " program counter wrap-around occures at address\n"
208 " "
209 " <val>. Supported values: 8k, 16k, 32k and 64k.\n"));
210 fprintf (file, _(" --no-call-ret-replacement "
211 "The relaxation machine normally will\n"
212 " "
213 " substitute two immediately following call/ret\n"
214 " "
215 " instructions by a single jump instruction.\n"
216 " "
217 " This option disables this optimization.\n"));
218 fprintf (file, _(" --no-stubs "
219 "If the linker detects to attempt to access\n"
220 " "
221 " an instruction beyond 128k by a reloc that\n"
222 " "
223 " is limited to 128k max, it inserts a jump\n"
224 " "
225 " stub. You can de-active this with this switch.\n"));
226 fprintf (file, _(" --debug-stubs "
227 "Used for debugging avr-ld.\n"));
228 fprintf (file, _(" --debug-relax "
229 "Used for debugging avr-ld.\n"));
230 '
231
232 PARSE_AND_LIST_ARGS_CASES='
233
234 case OPTION_PMEM_WRAP_AROUND:
235 {
236 /* This variable is defined in the bfd library. */
237 if ((!strcmp (optarg,"32k")) || (!strcmp (optarg,"32K")))
238 avr_pc_wrap_around = 32768;
239 else if ((!strcmp (optarg,"8k")) || (!strcmp (optarg,"8K")))
240 avr_pc_wrap_around = 8192;
241 else if ((!strcmp (optarg,"16k")) || (!strcmp (optarg,"16K")))
242 avr_pc_wrap_around = 16384;
243 else if ((!strcmp (optarg,"64k")) || (!strcmp (optarg,"64K")))
244 avr_pc_wrap_around = 0x10000;
245 else
246 return FALSE;
247 }
248 break;
249
250 case OPTION_DEBUG_STUBS:
251 avr_debug_stubs = TRUE;
252 break;
253
254 case OPTION_DEBUG_RELAX:
255 avr_debug_relax = TRUE;
256 break;
257
258 case OPTION_NO_STUBS:
259 avr_no_stubs = TRUE;
260 break;
261
262 case OPTION_NO_CALL_RET_REPLACEMENT:
263 {
264 /* This variable is defined in the bfd library. */
265 avr_replace_call_ret_sequences = FALSE;
266 }
267 break;
268 '
269
270 #
271 # Put these extra avr-elf routines in ld_${EMULATION_NAME}_emulation
272 #
273 LDEMUL_BEFORE_PARSE=avr_elf_before_parse
274 LDEMUL_BEFORE_ALLOCATION=avr_elf_${EMULATION_NAME}_before_allocation
275 LDEMUL_AFTER_ALLOCATION=avr_elf_after_allocation
276 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=avr_elf_create_output_section_statements
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