1 # This shell script emits a C file. -*- C -*- 2 # Copyright (C) 1991-2014 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 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'. 25 # 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 29 # its trampoline 30 # The trampolines to generate are collected during this pass 31 # (See elf32_m68hc11_size_stubs) 32 # 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) 36 # 37 # - During relocation the R_M68HC11_16 relocation to the far symbols 38 # are redirected to the trampoline that was generated. 39 # 40 # Copied from hppaelf and adapted for M68HC11/M68HC12 specific needs. 41 # 42 fragment <<EOF 43 44 #include "ldctor.h" 45 #include "elf32-m68hc1x.h" 46 47 static asection *m68hc11elf_add_stub_section (const char *, asection *); 48 49 /* Fake input file for stubs. */ 50 static lang_input_statement_type *stub_file; 51 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; 56 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; 60 61 static void 62 m68hc11_elf_${EMULATION_NAME}_before_allocation (void) 63 { 64 lang_memory_region_type* region; 65 int ret; 66 67 gld${EMULATION_NAME}_before_allocation (); 68 69 /* If generating a relocatable output file, then we don't 70 have to generate the trampolines. */ 71 if (link_info.relocatable) 72 return; 73 74 ret = elf32_m68hc11_setup_section_lists (link_info.output_bfd, &link_info); 75 if (ret != 0 && no_trampoline == 0) 76 { 77 if (ret < 0) 78 { 79 einfo ("%X%P: can not size stub section: %E\n"); 80 return; 81 } 82 83 /* Call into the BFD backend to do the real work. */ 84 if (!elf32_m68hc11_size_stubs (link_info.output_bfd, 85 stub_file->the_bfd, 86 &link_info, 87 &m68hc11elf_add_stub_section)) 88 { 89 einfo ("%X%P: can not size stub section: %E\n"); 90 return; 91 } 92 } 93 94 if (bank_window_name == 0) 95 return; 96 97 /* The 'bank_window_name' memory region is a special region that describes 98 the memory bank window to access to paged memory. For 68HC12 99 this is fixed and should be: 100 101 window (rx) : ORIGIN = 0x8000, LENGTH = 16K 102 103 But for 68HC11 this is board specific. The definition of such 104 memory region allows to control how this paged memory is accessed. */ 105 region = lang_memory_region_lookup (bank_window_name, FALSE); 106 107 /* Check the length to see if it was defined in the script. */ 108 if (region->length != 0) 109 { 110 struct m68hc11_page_info *pinfo; 111 unsigned i; 112 113 /* Get default values */ 114 m68hc11_elf_get_bank_parameters (&link_info); 115 pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo; 116 117 /* And override them with the region definition. */ 118 pinfo->bank_size = region->length; 119 pinfo->bank_shift = 0; 120 for (i = pinfo->bank_size; i != 0; i >>= 1) 121 pinfo->bank_shift++; 122 pinfo->bank_shift--; 123 pinfo->bank_size = 1L << pinfo->bank_shift; 124 pinfo->bank_mask = (1 << pinfo->bank_shift) - 1; 125 pinfo->bank_physical = region->origin; 126 pinfo->bank_physical_end = region->origin + pinfo->bank_size; 127 128 if (pinfo->bank_size != region->length) 129 { 130 einfo (_("warning: the size of the 'window' memory region " 131 "is not a power of 2\n")); 132 einfo (_("warning: its size %d is truncated to %d\n"), 133 region->length, pinfo->bank_size); 134 } 135 } 136 } 137 138 /* This is called before the input files are opened. We create a new 139 fake input file to hold the stub sections. */ 140 141 static void 142 m68hc11elf_create_output_section_statements (void) 143 { 144 stub_file = lang_add_input_file ("linker stubs", 145 lang_input_file_is_fake_enum, 146 NULL); 147 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); 148 if (stub_file->the_bfd == NULL 149 || !bfd_set_arch_mach (stub_file->the_bfd, 150 bfd_get_arch (link_info.output_bfd), 151 bfd_get_mach (link_info.output_bfd))) 152 { 153 einfo ("%X%P: can not create BFD %E\n"); 154 return; 155 } 156 157 ldlang_add_file (stub_file); 158 } 159 160 161 struct hook_stub_info 162 { 163 lang_statement_list_type add; 164 asection *input_section; 165 }; 166 167 /* Traverse the linker tree to find the spot where the stub goes. */ 168 169 static bfd_boolean 170 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) 171 { 172 lang_statement_union_type *l; 173 bfd_boolean ret; 174 175 for (; (l = *lp) != NULL; lp = &l->header.next) 176 { 177 switch (l->header.type) 178 { 179 case lang_constructors_statement_enum: 180 ret = hook_in_stub (info, &constructor_list.head); 181 if (ret) 182 return ret; 183 break; 184 185 case lang_output_section_statement_enum: 186 ret = hook_in_stub (info, 187 &l->output_section_statement.children.head); 188 if (ret) 189 return ret; 190 break; 191 192 case lang_wild_statement_enum: 193 ret = hook_in_stub (info, &l->wild_statement.children.head); 194 if (ret) 195 return ret; 196 break; 197 198 case lang_group_statement_enum: 199 ret = hook_in_stub (info, &l->group_statement.children.head); 200 if (ret) 201 return ret; 202 break; 203 204 case lang_input_section_enum: 205 if (l->input_section.section == info->input_section 206 || strcmp (bfd_get_section_name (l->input_section.section->owner, 207 l->input_section.section), 208 bfd_get_section_name (info->input_section->owner, 209 info->input_section)) == 0) 210 { 211 /* We've found our section. Insert the stub immediately 212 before its associated input section. */ 213 *lp = info->add.head; 214 *(info->add.tail) = l; 215 return TRUE; 216 } 217 break; 218 219 case lang_data_statement_enum: 220 case lang_reloc_statement_enum: 221 case lang_object_symbols_statement_enum: 222 case lang_output_statement_enum: 223 case lang_target_statement_enum: 224 case lang_input_statement_enum: 225 case lang_assignment_statement_enum: 226 case lang_padding_statement_enum: 227 case lang_address_statement_enum: 228 case lang_fill_statement_enum: 229 break; 230 231 default: 232 FAIL (); 233 break; 234 } 235 } 236 return FALSE; 237 } 238 239 240 /* Call-back for elf32_m68hc11_size_stubs. */ 241 242 /* Create a new stub section, and arrange for it to be linked 243 immediately before INPUT_SECTION. */ 244 245 static asection * 246 m68hc11elf_add_stub_section (const char *stub_sec_name, 247 asection *tramp_section) 248 { 249 asection *stub_sec; 250 flagword flags; 251 asection *output_section; 252 lang_output_section_statement_type *os; 253 struct hook_stub_info info; 254 255 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE 256 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); 257 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, 258 stub_sec_name, flags); 259 if (stub_sec == NULL) 260 goto err_ret; 261 262 output_section = tramp_section->output_section; 263 os = lang_output_section_get (output_section); 264 265 /* Try to put the new section at the same place as an existing 266 .tramp section. Such .tramp section exists in most cases and 267 contains the trampoline code. This way we put the generated trampoline 268 at the correct place. */ 269 info.input_section = tramp_section; 270 lang_list_init (&info.add); 271 lang_add_section (&info.add, stub_sec, NULL, os); 272 273 if (info.add.head == NULL) 274 goto err_ret; 275 276 if (hook_in_stub (&info, &os->children.head)) 277 return stub_sec; 278 279 err_ret: 280 einfo ("%X%P: can not make stub section: %E\n"); 281 return NULL; 282 } 283 284 /* For the 68HC12 we use this opportunity to build linker stubs. */ 285 286 static void 287 m68hc11elf_after_allocation (void) 288 { 289 /* Now build the linker stubs. */ 290 if (stub_file->the_bfd->sections != NULL) 291 { 292 /* Call again the trampoline analyzer to initialize the trampoline 293 stubs with the correct symbol addresses. Since there could have 294 been relaxation, the symbol addresses that were found during 295 first call may no longer be correct. */ 296 if (!elf32_m68hc11_size_stubs (link_info.output_bfd, 297 stub_file->the_bfd, 298 &link_info, 0)) 299 { 300 einfo ("%X%P: can not size stub section: %E\n"); 301 return; 302 } 303 if (!elf32_m68hc11_build_stubs (link_info.output_bfd, &link_info)) 304 einfo ("%X%P: can not build stubs: %E\n"); 305 } 306 307 gld${EMULATION_NAME}_after_allocation (); 308 } 309 310 311 /* Avoid processing the fake stub_file in vercheck, stat_needed and 312 check_needed routines. */ 313 314 static void (*real_func) (lang_input_statement_type *); 315 316 static void m68hc11_for_each_input_file_wrapper (lang_input_statement_type *l) 317 { 318 if (l != stub_file) 319 (*real_func) (l); 320 } 321 322 static void 323 m68hc11_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) 324 { 325 real_func = func; 326 lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper); 327 } 328 329 #define lang_for_each_input_file m68hc11_lang_for_each_input_file 330 331 EOF 332 333 # Define some shell vars to insert bits of code into the standard elf 334 # parse_args and list_options functions. 335 # 336 PARSE_AND_LIST_PROLOGUE=' 337 #define OPTION_NO_TRAMPOLINE 300 338 #define OPTION_BANK_WINDOW 301 339 ' 340 341 # The options are repeated below so that no abbreviations are allowed. 342 # Otherwise -s matches stub-group-size 343 PARSE_AND_LIST_LONGOPTS=' 344 { "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE }, 345 { "bank-window", required_argument, NULL, OPTION_BANK_WINDOW }, 346 ' 347 348 PARSE_AND_LIST_OPTIONS=' 349 fprintf (file, _( 350 " --no-trampoline Do not generate the far trampolines used to call\n" 351 " a far function using 'jsr' or 'bsr'.\n" 352 " --bank-window NAME Specify the name of the memory region describing\n" 353 " the layout of the memory bank window.\n" 354 )); 355 ' 356 357 PARSE_AND_LIST_ARGS_CASES=' 358 case OPTION_NO_TRAMPOLINE: 359 no_trampoline = 1; 360 break; 361 case OPTION_BANK_WINDOW: 362 bank_window_name = optarg; 363 break; 364 ' 365 366 # Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation 367 # 368 LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation 369 LDEMUL_AFTER_ALLOCATION=m68hc11elf_after_allocation 370 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements 371
