1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2007
3 # Free Software Foundation, Inc.
5 # This file is part of the GNU Binutils.
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.
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.
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,
23 # This file is sourced from elf32.em, and defines extra m68hc12-elf
24 # and m68hc11-elf specific routines. It is used to generate the
25 # HC11/HC12 trampolines to call a far function by using a normal 'jsr/bsr'.
27 # - The HC11/HC12 relocations are checked to see if there is a
28 # R_M68HC11_16 relocation to a symbol marked with STO_M68HC12_FAR.
29 # This relocation cannot be made on the symbol but must be made on
31 # The trampolines to generate are collected during this pass
32 # (See elf32_m68hc11_size_stubs)
34 # - The trampolines are generated in a ".tramp" section. The generation
35 # takes care of HC11 and HC12 specificities.
36 # (See elf32_m68hc11_build_stubs)
38 # - During relocation the R_M68HC11_16 relocation to the far symbols
39 # are redirected to the trampoline that was generated.
41 # Copied from hppaelf and adapted for M68HC11/M68HC12 specific needs.
46 #include "elf32-m68hc1x.h"
48 static asection *m68hc11elf_add_stub_section (const char *, asection *);
50 /* Fake input file for stubs. */
51 static lang_input_statement_type *stub_file;
53 /* By default the HC11/HC12 trampolines to call a far function using
54 a normal 'bsr' and 'jsr' convention are generated during the link.
55 The --no-trampoline option prevents that. */
56 static int no_trampoline = 0;
58 /* Name of memory bank window in the MEMORY description.
59 This is set by --bank-window option. */
60 static const char* bank_window_name = 0;
63 m68hc11_elf_${EMULATION_NAME}_before_allocation (void)
65 lang_memory_region_type* region;
68 gld${EMULATION_NAME}_before_allocation ();
70 /* If generating a relocatable output file, then we don't
71 have to generate the trampolines. */
72 if (link_info.relocatable)
75 ret = elf32_m68hc11_setup_section_lists (output_bfd, &link_info);
76 if (ret != 0 && no_trampoline == 0)
80 einfo ("%X%P: can not size stub section: %E\n");
84 /* Call into the BFD backend to do the real work. */
85 if (!elf32_m68hc11_size_stubs (output_bfd,
88 &m68hc11elf_add_stub_section))
90 einfo ("%X%P: can not size stub section: %E\n");
95 if (bank_window_name == 0)
98 /* The 'bank_window_name' memory region is a special region that describes
99 the memory bank window to access to paged memory. For 68HC12
100 this is fixed and should be:
102 window (rx) : ORIGIN = 0x8000, LENGTH = 16K
104 But for 68HC11 this is board specific. The definition of such
105 memory region allows to control how this paged memory is accessed. */
106 region = lang_memory_region_lookup (bank_window_name, FALSE);
108 /* Check the length to see if it was defined in the script. */
109 if (region->length != 0)
111 struct m68hc11_page_info *pinfo;
114 /* Get default values */
115 m68hc11_elf_get_bank_parameters (&link_info);
116 pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
118 /* And override them with the region definition. */
119 pinfo->bank_size = region->length;
120 pinfo->bank_shift = 0;
121 for (i = pinfo->bank_size; i != 0; i >>= 1)
124 pinfo->bank_size = 1L << pinfo->bank_shift;
125 pinfo->bank_mask = (1 << pinfo->bank_shift) - 1;
126 pinfo->bank_physical = region->origin;
127 pinfo->bank_physical_end = region->origin + pinfo->bank_size;
129 if (pinfo->bank_size != region->length)
131 einfo (_("warning: the size of the 'window' memory region "
132 "is not a power of 2\n"));
133 einfo (_("warning: its size %d is truncated to %d\n"),
134 region->length, pinfo->bank_size);
139 /* This is called before the input files are opened. We create a new
140 fake input file to hold the stub sections. */
143 m68hc11elf_create_output_section_statements (void)
145 stub_file = lang_add_input_file ("linker stubs",
146 lang_input_file_is_fake_enum,
148 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
149 if (stub_file->the_bfd == NULL
150 || !bfd_set_arch_mach (stub_file->the_bfd,
151 bfd_get_arch (output_bfd),
152 bfd_get_mach (output_bfd)))
154 einfo ("%X%P: can not create BFD %E\n");
158 ldlang_add_file (stub_file);
162 struct hook_stub_info
164 lang_statement_list_type add;
165 asection *input_section;
168 /* Traverse the linker tree to find the spot where the stub goes. */
171 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
173 lang_statement_union_type *l;
176 for (; (l = *lp) != NULL; lp = &l->header.next)
178 switch (l->header.type)
180 case lang_constructors_statement_enum:
181 ret = hook_in_stub (info, &constructor_list.head);
186 case lang_output_section_statement_enum:
187 ret = hook_in_stub (info,
188 &l->output_section_statement.children.head);
193 case lang_wild_statement_enum:
194 ret = hook_in_stub (info, &l->wild_statement.children.head);
199 case lang_group_statement_enum:
200 ret = hook_in_stub (info, &l->group_statement.children.head);
205 case lang_input_section_enum:
206 if (l->input_section.section == info->input_section
207 || strcmp (bfd_get_section_name (output_section,
208 l->input_section.section),
209 bfd_get_section_name (output_section,
210 info->input_section)) == 0)
212 /* We've found our section. Insert the stub immediately
213 before its associated input section. */
214 *lp = info->add.head;
215 *(info->add.tail) = l;
220 case lang_data_statement_enum:
221 case lang_reloc_statement_enum:
222 case lang_object_symbols_statement_enum:
223 case lang_output_statement_enum:
224 case lang_target_statement_enum:
225 case lang_input_statement_enum:
226 case lang_assignment_statement_enum:
227 case lang_padding_statement_enum:
228 case lang_address_statement_enum:
229 case lang_fill_statement_enum:
241 /* Call-back for elf32_m68hc11_size_stubs. */
243 /* Create a new stub section, and arrange for it to be linked
244 immediately before INPUT_SECTION. */
247 m68hc11elf_add_stub_section (const char *stub_sec_name,
248 asection *tramp_section)
252 asection *output_section;
254 lang_output_section_statement_type *os;
255 struct hook_stub_info info;
257 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
258 if (stub_sec == NULL)
261 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
262 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
263 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
266 output_section = tramp_section->output_section;
267 secname = bfd_get_section_name (output_section->owner, output_section);
268 os = lang_output_section_find (secname);
270 /* Try to put the new section at the same place as an existing
271 .tramp section. Such .tramp section exists in most cases and
272 contains the trampoline code. This way we put the generated trampoline
273 at the correct place. */
274 info.input_section = tramp_section;
275 lang_list_init (&info.add);
276 lang_add_section (&info.add, stub_sec, os);
278 if (info.add.head == NULL)
281 if (hook_in_stub (&info, &os->children.head))
285 einfo ("%X%P: can not make stub section: %E\n");
289 /* Final emulation specific call. For the 68HC12 we use this opportunity
290 to build linker stubs. */
293 m68hc11elf_finish (void)
295 /* Now build the linker stubs. */
296 if (stub_file->the_bfd->sections != NULL)
298 /* Call again the trampoline analyzer to initialize the trampoline
299 stubs with the correct symbol addresses. Since there could have
300 been relaxation, the symbol addresses that were found during
301 first call may no longer be correct. */
302 if (!elf32_m68hc11_size_stubs (output_bfd,
306 einfo ("%X%P: can not size stub section: %E\n");
309 if (!elf32_m68hc11_build_stubs (output_bfd, &link_info))
310 einfo ("%X%P: can not build stubs: %E\n");
313 gld${EMULATION_NAME}_finish ();
317 /* Avoid processing the fake stub_file in vercheck, stat_needed and
318 check_needed routines. */
320 static void (*real_func) (lang_input_statement_type *);
322 static void m68hc11_for_each_input_file_wrapper (lang_input_statement_type *l)
329 m68hc11_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
332 lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper);
335 #define lang_for_each_input_file m68hc11_lang_for_each_input_file
339 # Define some shell vars to insert bits of code into the standard elf
340 # parse_args and list_options functions.
342 PARSE_AND_LIST_PROLOGUE='
343 #define OPTION_NO_TRAMPOLINE 300
344 #define OPTION_BANK_WINDOW 301
347 # The options are repeated below so that no abbreviations are allowed.
348 # Otherwise -s matches stub-group-size
349 PARSE_AND_LIST_LONGOPTS='
350 { "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE },
351 { "bank-window", required_argument, NULL, OPTION_BANK_WINDOW },
354 PARSE_AND_LIST_OPTIONS='
356 " --no-trampoline Do not generate the far trampolines used to call\n"
357 " a far function using 'jsr' or 'bsr'.\n"
358 " --bank-window NAME Specify the name of the memory region describing\n"
359 " the layout of the memory bank window.\n"
363 PARSE_AND_LIST_ARGS_CASES='
364 case OPTION_NO_TRAMPOLINE:
367 case OPTION_BANK_WINDOW:
368 bank_window_name = optarg;
372 # Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation
374 LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation
375 LDEMUL_FINISH=m68hc11elf_finish
376 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements