1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 1991-2017 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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.
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.
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,
22 # This file is sourced from elf32.em, and defines extra m68hc12-elf
23 # and m68hc11-elf specific routines. It is used to generate the
24 # HC11/HC12 trampolines to call a far function by using a normal 'jsr/bsr'.
26 # - The HC11/HC12 relocations are checked to see if there is a
27 # R_M68HC11_16 relocation to a symbol marked with STO_M68HC12_FAR.
28 # This relocation cannot be made on the symbol but must be made on
30 # The trampolines to generate are collected during this pass
31 # (See elf32_m68hc11_size_stubs)
33 # - The trampolines are generated in a ".tramp" section. The generation
34 # takes care of HC11 and HC12 specificities.
35 # (See elf32_m68hc11_build_stubs)
37 # - During relocation the R_M68HC11_16 relocation to the far symbols
38 # are redirected to the trampoline that was generated.
40 # Copied from hppaelf and adapted for M68HC11/M68HC12 specific needs.
45 #include "elf32-m68hc1x.h"
47 static asection *m68hc11elf_add_stub_section (const char *, asection *);
49 /* Fake input file for stubs. */
50 static lang_input_statement_type *stub_file;
52 /* By default the HC11/HC12 trampolines to call a far function using
53 a normal 'bsr' and 'jsr' convention are generated during the link.
54 The --no-trampoline option prevents that. */
55 static int no_trampoline = 0;
57 /* Name of memory bank window in the MEMORY description.
58 This is set by --bank-window option. */
59 static const char* bank_window_name = 0;
62 m68hc11_elf_${EMULATION_NAME}_before_allocation (void)
64 lang_memory_region_type* region;
67 gld${EMULATION_NAME}_before_allocation ();
69 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
72 /* If generating a relocatable output file, then we don't
73 have to generate the trampolines. */
74 if (bfd_link_relocatable (&link_info))
77 ret = elf32_m68hc11_setup_section_lists (link_info.output_bfd, &link_info);
78 if (ret != 0 && no_trampoline == 0)
82 einfo (_("%X%P: can not size stub section: %E\n"));
86 /* Call into the BFD backend to do the real work. */
87 if (!elf32_m68hc11_size_stubs (link_info.output_bfd,
90 &m68hc11elf_add_stub_section))
92 einfo (_("%X%P: can not size stub section: %E\n"));
97 if (bank_window_name == 0)
100 /* The 'bank_window_name' memory region is a special region that describes
101 the memory bank window to access to paged memory. For 68HC12
102 this is fixed and should be:
104 window (rx) : ORIGIN = 0x8000, LENGTH = 16K
106 But for 68HC11 this is board specific. The definition of such
107 memory region allows to control how this paged memory is accessed. */
108 region = lang_memory_region_lookup (bank_window_name, FALSE);
110 /* Check the length to see if it was defined in the script. */
111 if (region->length != 0)
113 struct m68hc11_page_info *pinfo;
116 /* Get default values */
117 m68hc11_elf_get_bank_parameters (&link_info);
118 pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
120 /* And override them with the region definition. */
121 pinfo->bank_size = region->length;
122 pinfo->bank_shift = 0;
123 for (i = pinfo->bank_size; i != 0; i >>= 1)
126 pinfo->bank_size = 1L << pinfo->bank_shift;
127 pinfo->bank_mask = (1 << pinfo->bank_shift) - 1;
128 pinfo->bank_physical = region->origin;
129 pinfo->bank_physical_end = region->origin + pinfo->bank_size;
131 if (pinfo->bank_size != region->length)
133 einfo (_("warning: the size of the 'window' memory region "
134 "is not a power of 2\n"));
135 einfo (_("warning: its size %d is truncated to %d\n"),
136 region->length, pinfo->bank_size);
141 /* This is called before the input files are opened. We create a new
142 fake input file to hold the stub sections. */
145 m68hc11elf_create_output_section_statements (void)
147 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
149 einfo (_("%X%P: changing output format whilst linking "
150 "is not supported\n"));
154 stub_file = lang_add_input_file ("linker stubs",
155 lang_input_file_is_fake_enum,
157 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
158 if (stub_file->the_bfd == NULL
159 || !bfd_set_arch_mach (stub_file->the_bfd,
160 bfd_get_arch (link_info.output_bfd),
161 bfd_get_mach (link_info.output_bfd)))
163 einfo (_("%X%P: can not create BFD %E\n"));
167 ldlang_add_file (stub_file);
171 struct hook_stub_info
173 lang_statement_list_type add;
174 asection *input_section;
177 /* Traverse the linker tree to find the spot where the stub goes. */
180 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
182 lang_statement_union_type *l;
185 for (; (l = *lp) != NULL; lp = &l->header.next)
187 switch (l->header.type)
189 case lang_constructors_statement_enum:
190 ret = hook_in_stub (info, &constructor_list.head);
195 case lang_output_section_statement_enum:
196 ret = hook_in_stub (info,
197 &l->output_section_statement.children.head);
202 case lang_wild_statement_enum:
203 ret = hook_in_stub (info, &l->wild_statement.children.head);
208 case lang_group_statement_enum:
209 ret = hook_in_stub (info, &l->group_statement.children.head);
214 case lang_input_section_enum:
215 if (l->input_section.section == info->input_section
216 || strcmp (bfd_get_section_name (l->input_section.section->owner,
217 l->input_section.section),
218 bfd_get_section_name (info->input_section->owner,
219 info->input_section)) == 0)
221 /* We've found our section. Insert the stub immediately
222 before its associated input section. */
223 *lp = info->add.head;
224 *(info->add.tail) = l;
229 case lang_data_statement_enum:
230 case lang_reloc_statement_enum:
231 case lang_object_symbols_statement_enum:
232 case lang_output_statement_enum:
233 case lang_target_statement_enum:
234 case lang_input_statement_enum:
235 case lang_assignment_statement_enum:
236 case lang_padding_statement_enum:
237 case lang_address_statement_enum:
238 case lang_fill_statement_enum:
250 /* Call-back for elf32_m68hc11_size_stubs. */
252 /* Create a new stub section, and arrange for it to be linked
253 immediately before INPUT_SECTION. */
256 m68hc11elf_add_stub_section (const char *stub_sec_name,
257 asection *tramp_section)
261 asection *output_section;
262 lang_output_section_statement_type *os;
263 struct hook_stub_info info;
265 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
266 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
267 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
268 stub_sec_name, flags);
269 if (stub_sec == NULL)
272 output_section = tramp_section->output_section;
273 os = lang_output_section_get (output_section);
275 /* Try to put the new section at the same place as an existing
276 .tramp section. Such .tramp section exists in most cases and
277 contains the trampoline code. This way we put the generated trampoline
278 at the correct place. */
279 info.input_section = tramp_section;
280 lang_list_init (&info.add);
281 lang_add_section (&info.add, stub_sec, NULL, os);
283 if (info.add.head == NULL)
286 if (hook_in_stub (&info, &os->children.head))
290 einfo (_("%X%P: can not make stub section: %E\n"));
294 /* For the 68HC12 we use this opportunity to build linker stubs. */
297 m68hc11elf_after_allocation (void)
299 if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour)
301 /* Now build the linker stubs. */
302 if (stub_file->the_bfd->sections != NULL)
304 /* Call again the trampoline analyzer to initialize the trampoline
305 stubs with the correct symbol addresses. Since there could have
306 been relaxation, the symbol addresses that were found during
307 first call may no longer be correct. */
308 if (!elf32_m68hc11_size_stubs (link_info.output_bfd,
312 einfo (_("%X%P: can not size stub section: %E\n"));
315 if (!elf32_m68hc11_build_stubs (link_info.output_bfd, &link_info))
316 einfo (_("%X%P: can not build stubs: %E\n"));
320 gld${EMULATION_NAME}_after_allocation ();
324 /* Avoid processing the fake stub_file in vercheck, stat_needed and
325 check_needed routines. */
327 static void (*real_func) (lang_input_statement_type *);
329 static void m68hc11_for_each_input_file_wrapper (lang_input_statement_type *l)
336 m68hc11_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
339 lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper);
342 #define lang_for_each_input_file m68hc11_lang_for_each_input_file
346 # Define some shell vars to insert bits of code into the standard elf
347 # parse_args and list_options functions.
349 PARSE_AND_LIST_PROLOGUE='
350 #define OPTION_NO_TRAMPOLINE 300
351 #define OPTION_BANK_WINDOW 301
354 # The options are repeated below so that no abbreviations are allowed.
355 # Otherwise -s matches stub-group-size
356 PARSE_AND_LIST_LONGOPTS='
357 { "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE },
358 { "bank-window", required_argument, NULL, OPTION_BANK_WINDOW },
361 PARSE_AND_LIST_OPTIONS='
363 " --no-trampoline Do not generate the far trampolines used to call\n"
364 " a far function using 'jsr' or 'bsr'.\n"
365 " --bank-window NAME Specify the name of the memory region describing\n"
366 " the layout of the memory bank window.\n"
370 PARSE_AND_LIST_ARGS_CASES='
371 case OPTION_NO_TRAMPOLINE:
374 case OPTION_BANK_WINDOW:
375 bank_window_name = optarg;
379 # Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation
381 LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation
382 LDEMUL_AFTER_ALLOCATION=m68hc11elf_after_allocation
383 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements