1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003
3 # Free Software Foundation, Inc.
5 # This file is part of GLD, the Gnu Linker.
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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.
42 cat >>e${EMULATION_NAME}.c <<EOF
45 #include "elf32-m68hc1x.h"
47 static void m68hc11elf_create_output_section_statements PARAMS ((void));
48 static asection *m68hc11elf_add_stub_section
49 PARAMS ((const char *, asection *));
50 static void gld${EMULATION_NAME}_finish PARAMS ((void));
51 static void m68hc11_elf_${EMULATION_NAME}_before_allocation PARAMS ((void));
54 /* Fake input file for stubs. */
55 static lang_input_statement_type *stub_file;
57 /* By default the HC11/HC12 trampolines to call a far function using
58 a normal 'bsr' and 'jsr' convention are generated during the link.
59 The --no-trampoline option prevents that. */
60 static int no_trampoline = 0;
62 /* Name of memory bank window in the MEMORY description.
63 This is set by --bank-window option. */
64 static const char* bank_window_name = 0;
67 m68hc11_elf_${EMULATION_NAME}_before_allocation ()
69 lang_memory_region_type* region;
72 gld${EMULATION_NAME}_before_allocation ();
74 /* If generating a relocatable output file, then we don't
75 have to generate the trampolines. */
76 if (link_info.relocateable)
79 ret = elf32_m68hc11_setup_section_lists (output_bfd, &link_info);
80 if (ret != 0 && no_trampoline == 0)
84 einfo ("%X%P: can not size stub section: %E\n");
88 /* Call into the BFD backend to do the real work. */
89 if (!elf32_m68hc11_size_stubs (output_bfd,
92 &m68hc11elf_add_stub_section))
94 einfo ("%X%P: can not size stub section: %E\n");
99 if (bank_window_name == 0)
102 /* The 'bank_window_name' memory region is a special region that describes
103 the memory bank window to access to paged memory. For 68HC12
104 this is fixed and should be:
106 window (rx) : ORIGIN = 0x8000, LENGTH = 16K
108 But for 68HC11 this is board specific. The definition of such
109 memory region allows to control how this paged memory is accessed. */
110 region = lang_memory_region_lookup (bank_window_name);
112 /* Check the length to see if it was defined in the script. */
113 if (region->length != 0)
115 struct m68hc11_page_info *pinfo;
118 /* Get default values */
119 m68hc11_elf_get_bank_parameters (&link_info);
120 pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
122 /* And override them with the region definition. */
123 pinfo->bank_size = region->length;
124 pinfo->bank_shift = 0;
125 for (i = pinfo->bank_size; i != 0; i >>= 1)
128 pinfo->bank_size = 1L << pinfo->bank_shift;
129 pinfo->bank_mask = (1 << pinfo->bank_shift) - 1;
130 pinfo->bank_physical = region->origin;
131 pinfo->bank_physical_end = region->origin + pinfo->bank_size;
133 if (pinfo->bank_size != region->length)
135 einfo (_("warning: the size of the 'window' memory region "
136 "is not a power of 2\n"));
137 einfo (_("warning: its size %d is truncated to %d\n"),
138 region->length, pinfo->bank_size);
143 /* This is called before the input files are opened. We create a new
144 fake input file to hold the stub sections. */
147 m68hc11elf_create_output_section_statements ()
149 stub_file = lang_add_input_file ("linker stubs",
150 lang_input_file_is_fake_enum,
152 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
153 if (stub_file->the_bfd == NULL
154 || !bfd_set_arch_mach (stub_file->the_bfd,
155 bfd_get_arch (output_bfd),
156 bfd_get_mach (output_bfd)))
158 einfo ("%X%P: can not create BFD %E\n");
162 ldlang_add_file (stub_file);
166 struct hook_stub_info
168 lang_statement_list_type add;
169 asection *input_section;
172 /* Traverse the linker tree to find the spot where the stub goes. */
174 static bfd_boolean hook_in_stub
175 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
178 hook_in_stub (info, lp)
179 struct hook_stub_info *info;
180 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 (output_section,
217 l->input_section.section),
218 bfd_get_section_name (output_section,
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 (stub_sec_name, tramp_section)
257 const char *stub_sec_name;
258 asection *tramp_section;
262 asection *output_section;
264 lang_output_section_statement_type *os;
265 struct hook_stub_info info;
267 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
268 if (stub_sec == NULL)
271 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
272 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
273 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
276 output_section = tramp_section->output_section;
277 secname = bfd_get_section_name (output_section->owner, output_section);
278 os = lang_output_section_find (secname);
280 /* Try to put the new section at the same place as an existing
281 .tramp section. Such .tramp section exists in most cases and
282 contains the trampoline code. This way we put the generated trampoline
283 at the correct place. */
284 info.input_section = tramp_section;
285 lang_list_init (&info.add);
286 lang_add_section (&info.add, stub_sec, os, stub_file);
288 if (info.add.head == NULL)
291 if (hook_in_stub (&info, &os->children.head))
295 einfo ("%X%P: can not make stub section: %E\n");
299 /* Final emulation specific call. For the 68HC12 we use this opportunity
300 to build linker stubs. */
303 gld${EMULATION_NAME}_finish ()
305 /* Now build the linker stubs. */
306 if (stub_file->the_bfd->sections != NULL)
308 /* Call again the trampoline analyzer to initialize the trampoline
309 stubs with the correct symbol addresses. Since there could have
310 been relaxation, the symbol addresses that were found during
311 first call may no longer be correct. */
312 if (!elf32_m68hc11_size_stubs (output_bfd,
316 einfo ("%X%P: can not size stub section: %E\n");
319 if (!elf32_m68hc11_build_stubs (output_bfd, &link_info))
320 einfo ("%X%P: can not build stubs: %E\n");
325 /* Avoid processing the fake stub_file in vercheck, stat_needed and
326 check_needed routines. */
328 static void m68hc11_for_each_input_file_wrapper
329 PARAMS ((lang_input_statement_type *));
330 static void m68hc11_lang_for_each_input_file
331 PARAMS ((void (*) (lang_input_statement_type *)));
333 static void (*real_func) PARAMS ((lang_input_statement_type *));
335 static void m68hc11_for_each_input_file_wrapper (l)
336 lang_input_statement_type *l;
343 m68hc11_lang_for_each_input_file (func)
344 void (*func) PARAMS ((lang_input_statement_type *));
347 lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper);
350 #define lang_for_each_input_file m68hc11_lang_for_each_input_file
354 # Define some shell vars to insert bits of code into the standard elf
355 # parse_args and list_options functions.
357 PARSE_AND_LIST_PROLOGUE='
358 #define OPTION_NO_TRAMPOLINE 300
359 #define OPTION_BANK_WINDOW 301
362 # The options are repeated below so that no abbreviations are allowed.
363 # Otherwise -s matches stub-group-size
364 PARSE_AND_LIST_LONGOPTS='
365 { "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE },
366 { "bank-window", required_argument, NULL, OPTION_BANK_WINDOW },
369 PARSE_AND_LIST_OPTIONS='
371 " --no-trampoline Do not generate the far trampolines used to call\n"
372 " a far function using 'jsr' or 'bsr'.\n"
373 " --bank-window NAME Specify the name of the memory region describing\n"
374 " the layout of the memory bank window.\n"
378 PARSE_AND_LIST_ARGS_CASES='
379 case OPTION_NO_TRAMPOLINE:
382 case OPTION_BANK_WINDOW:
383 bank_window_name = optarg;
387 # Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation
389 LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation
390 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
391 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements