| 1 | /* dw2gencfi.c - Support for generating Dwarf2 CFI information. |
| 2 | Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Michal Ludvig <mludvig@suse.cz> |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | #include "as.h" |
| 24 | #include "dw2gencfi.h" |
| 25 | #include "subsegs.h" |
| 26 | |
| 27 | #ifdef TARGET_USE_CFIPOP |
| 28 | |
| 29 | /* By default, use difference expressions if DIFF_EXPR_OK is defined. */ |
| 30 | #ifndef CFI_DIFF_EXPR_OK |
| 31 | # ifdef DIFF_EXPR_OK |
| 32 | # define CFI_DIFF_EXPR_OK 1 |
| 33 | # else |
| 34 | # define CFI_DIFF_EXPR_OK 0 |
| 35 | # endif |
| 36 | #endif |
| 37 | |
| 38 | /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field |
| 39 | of the CIE. Default to 1 if not otherwise specified. */ |
| 40 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
| 41 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
| 42 | #endif |
| 43 | |
| 44 | /* By default, use 32-bit relocations from .eh_frame into .text. */ |
| 45 | #ifndef DWARF2_FDE_RELOC_SIZE |
| 46 | # define DWARF2_FDE_RELOC_SIZE 4 |
| 47 | #endif |
| 48 | |
| 49 | /* By default, use a read-only .eh_frame section. */ |
| 50 | #ifndef DWARF2_EH_FRAME_READ_ONLY |
| 51 | # define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY |
| 52 | #endif |
| 53 | |
| 54 | #ifndef EH_FRAME_ALIGNMENT |
| 55 | # define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) |
| 56 | #endif |
| 57 | |
| 58 | #ifndef tc_cfi_frame_initial_instructions |
| 59 | # define tc_cfi_frame_initial_instructions() ((void)0) |
| 60 | #endif |
| 61 | |
| 62 | #ifndef DWARF2_ADDR_SIZE |
| 63 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
| 64 | #endif |
| 65 | |
| 66 | struct cfi_escape_data { |
| 67 | struct cfi_escape_data *next; |
| 68 | expressionS exp; |
| 69 | }; |
| 70 | |
| 71 | struct cfi_insn_data |
| 72 | { |
| 73 | struct cfi_insn_data *next; |
| 74 | int insn; |
| 75 | union { |
| 76 | struct { |
| 77 | unsigned reg; |
| 78 | offsetT offset; |
| 79 | } ri; |
| 80 | |
| 81 | struct { |
| 82 | unsigned reg1; |
| 83 | unsigned reg2; |
| 84 | } rr; |
| 85 | |
| 86 | unsigned r; |
| 87 | offsetT i; |
| 88 | |
| 89 | struct { |
| 90 | symbolS *lab1; |
| 91 | symbolS *lab2; |
| 92 | } ll; |
| 93 | |
| 94 | struct cfi_escape_data *esc; |
| 95 | |
| 96 | struct { |
| 97 | unsigned reg, encoding; |
| 98 | expressionS exp; |
| 99 | } ea; |
| 100 | } u; |
| 101 | }; |
| 102 | |
| 103 | struct fde_entry |
| 104 | { |
| 105 | struct fde_entry *next; |
| 106 | symbolS *start_address; |
| 107 | symbolS *end_address; |
| 108 | struct cfi_insn_data *data; |
| 109 | struct cfi_insn_data **last; |
| 110 | unsigned char per_encoding; |
| 111 | unsigned char lsda_encoding; |
| 112 | expressionS personality; |
| 113 | expressionS lsda; |
| 114 | unsigned int return_column; |
| 115 | unsigned int signal_frame; |
| 116 | }; |
| 117 | |
| 118 | struct cie_entry |
| 119 | { |
| 120 | struct cie_entry *next; |
| 121 | symbolS *start_address; |
| 122 | unsigned int return_column; |
| 123 | unsigned int signal_frame; |
| 124 | unsigned char per_encoding; |
| 125 | unsigned char lsda_encoding; |
| 126 | expressionS personality; |
| 127 | struct cfi_insn_data *first, *last; |
| 128 | }; |
| 129 | |
| 130 | |
| 131 | /* List of FDE entries. */ |
| 132 | static struct fde_entry *all_fde_data; |
| 133 | static struct fde_entry **last_fde_data = &all_fde_data; |
| 134 | |
| 135 | /* List of CIEs so that they could be reused. */ |
| 136 | static struct cie_entry *cie_root; |
| 137 | |
| 138 | /* Stack of old CFI data, for save/restore. */ |
| 139 | struct cfa_save_data |
| 140 | { |
| 141 | struct cfa_save_data *next; |
| 142 | offsetT cfa_offset; |
| 143 | }; |
| 144 | |
| 145 | /* Current open FDE entry. */ |
| 146 | struct frch_cfi_data |
| 147 | { |
| 148 | struct fde_entry *cur_fde_data; |
| 149 | symbolS *last_address; |
| 150 | offsetT cur_cfa_offset; |
| 151 | struct cfa_save_data *cfa_save_stack; |
| 152 | }; |
| 153 | \f |
| 154 | /* Construct a new FDE structure and add it to the end of the fde list. */ |
| 155 | |
| 156 | static struct fde_entry * |
| 157 | alloc_fde_entry (void) |
| 158 | { |
| 159 | struct fde_entry *fde = (struct fde_entry *) |
| 160 | xcalloc (1, sizeof (struct fde_entry)); |
| 161 | |
| 162 | frchain_now->frch_cfi_data = (struct frch_cfi_data *) |
| 163 | xcalloc (1, sizeof (struct frch_cfi_data)); |
| 164 | frchain_now->frch_cfi_data->cur_fde_data = fde; |
| 165 | *last_fde_data = fde; |
| 166 | last_fde_data = &fde->next; |
| 167 | |
| 168 | fde->last = &fde->data; |
| 169 | fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; |
| 170 | fde->per_encoding = DW_EH_PE_omit; |
| 171 | fde->lsda_encoding = DW_EH_PE_omit; |
| 172 | |
| 173 | return fde; |
| 174 | } |
| 175 | |
| 176 | /* The following functions are available for a backend to construct its |
| 177 | own unwind information, usually from legacy unwind directives. */ |
| 178 | |
| 179 | /* Construct a new INSN structure and add it to the end of the insn list |
| 180 | for the currently active FDE. */ |
| 181 | |
| 182 | static struct cfi_insn_data * |
| 183 | alloc_cfi_insn_data (void) |
| 184 | { |
| 185 | struct cfi_insn_data *insn = (struct cfi_insn_data *) |
| 186 | xcalloc (1, sizeof (struct cfi_insn_data)); |
| 187 | struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data; |
| 188 | |
| 189 | *cur_fde_data->last = insn; |
| 190 | cur_fde_data->last = &insn->next; |
| 191 | |
| 192 | return insn; |
| 193 | } |
| 194 | |
| 195 | /* Construct a new FDE structure that begins at LABEL. */ |
| 196 | |
| 197 | void |
| 198 | cfi_new_fde (symbolS *label) |
| 199 | { |
| 200 | struct fde_entry *fde = alloc_fde_entry (); |
| 201 | fde->start_address = label; |
| 202 | frchain_now->frch_cfi_data->last_address = label; |
| 203 | } |
| 204 | |
| 205 | /* End the currently open FDE. */ |
| 206 | |
| 207 | void |
| 208 | cfi_end_fde (symbolS *label) |
| 209 | { |
| 210 | frchain_now->frch_cfi_data->cur_fde_data->end_address = label; |
| 211 | free (frchain_now->frch_cfi_data); |
| 212 | frchain_now->frch_cfi_data = NULL; |
| 213 | } |
| 214 | |
| 215 | /* Set the return column for the current FDE. */ |
| 216 | |
| 217 | void |
| 218 | cfi_set_return_column (unsigned regno) |
| 219 | { |
| 220 | frchain_now->frch_cfi_data->cur_fde_data->return_column = regno; |
| 221 | } |
| 222 | |
| 223 | /* Universal functions to store new instructions. */ |
| 224 | |
| 225 | static void |
| 226 | cfi_add_CFA_insn(int insn) |
| 227 | { |
| 228 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 229 | |
| 230 | insn_ptr->insn = insn; |
| 231 | } |
| 232 | |
| 233 | static void |
| 234 | cfi_add_CFA_insn_reg (int insn, unsigned regno) |
| 235 | { |
| 236 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 237 | |
| 238 | insn_ptr->insn = insn; |
| 239 | insn_ptr->u.r = regno; |
| 240 | } |
| 241 | |
| 242 | static void |
| 243 | cfi_add_CFA_insn_offset (int insn, offsetT offset) |
| 244 | { |
| 245 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 246 | |
| 247 | insn_ptr->insn = insn; |
| 248 | insn_ptr->u.i = offset; |
| 249 | } |
| 250 | |
| 251 | static void |
| 252 | cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) |
| 253 | { |
| 254 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 255 | |
| 256 | insn_ptr->insn = insn; |
| 257 | insn_ptr->u.rr.reg1 = reg1; |
| 258 | insn_ptr->u.rr.reg2 = reg2; |
| 259 | } |
| 260 | |
| 261 | static void |
| 262 | cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) |
| 263 | { |
| 264 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 265 | |
| 266 | insn_ptr->insn = insn; |
| 267 | insn_ptr->u.ri.reg = regno; |
| 268 | insn_ptr->u.ri.offset = offset; |
| 269 | } |
| 270 | |
| 271 | /* Add a CFI insn to advance the PC from the last address to LABEL. */ |
| 272 | |
| 273 | void |
| 274 | cfi_add_advance_loc (symbolS *label) |
| 275 | { |
| 276 | struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
| 277 | |
| 278 | insn->insn = DW_CFA_advance_loc; |
| 279 | insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address; |
| 280 | insn->u.ll.lab2 = label; |
| 281 | |
| 282 | frchain_now->frch_cfi_data->last_address = label; |
| 283 | } |
| 284 | |
| 285 | /* Add a DW_CFA_offset record to the CFI data. */ |
| 286 | |
| 287 | void |
| 288 | cfi_add_CFA_offset (unsigned regno, offsetT offset) |
| 289 | { |
| 290 | unsigned int abs_data_align; |
| 291 | |
| 292 | gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
| 293 | cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); |
| 294 | |
| 295 | abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
| 296 | ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
| 297 | if (offset % abs_data_align) |
| 298 | as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
| 299 | } |
| 300 | |
| 301 | /* Add a DW_CFA_def_cfa record to the CFI data. */ |
| 302 | |
| 303 | void |
| 304 | cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) |
| 305 | { |
| 306 | cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); |
| 307 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| 308 | } |
| 309 | |
| 310 | /* Add a DW_CFA_register record to the CFI data. */ |
| 311 | |
| 312 | void |
| 313 | cfi_add_CFA_register (unsigned reg1, unsigned reg2) |
| 314 | { |
| 315 | cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); |
| 316 | } |
| 317 | |
| 318 | /* Add a DW_CFA_def_cfa_register record to the CFI data. */ |
| 319 | |
| 320 | void |
| 321 | cfi_add_CFA_def_cfa_register (unsigned regno) |
| 322 | { |
| 323 | cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); |
| 324 | } |
| 325 | |
| 326 | /* Add a DW_CFA_def_cfa_offset record to the CFI data. */ |
| 327 | |
| 328 | void |
| 329 | cfi_add_CFA_def_cfa_offset (offsetT offset) |
| 330 | { |
| 331 | cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); |
| 332 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| 333 | } |
| 334 | |
| 335 | void |
| 336 | cfi_add_CFA_restore (unsigned regno) |
| 337 | { |
| 338 | cfi_add_CFA_insn_reg (DW_CFA_restore, regno); |
| 339 | } |
| 340 | |
| 341 | void |
| 342 | cfi_add_CFA_undefined (unsigned regno) |
| 343 | { |
| 344 | cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); |
| 345 | } |
| 346 | |
| 347 | void |
| 348 | cfi_add_CFA_same_value (unsigned regno) |
| 349 | { |
| 350 | cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); |
| 351 | } |
| 352 | |
| 353 | void |
| 354 | cfi_add_CFA_remember_state (void) |
| 355 | { |
| 356 | struct cfa_save_data *p; |
| 357 | |
| 358 | cfi_add_CFA_insn (DW_CFA_remember_state); |
| 359 | |
| 360 | p = (struct cfa_save_data *) xmalloc (sizeof (*p)); |
| 361 | p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset; |
| 362 | p->next = frchain_now->frch_cfi_data->cfa_save_stack; |
| 363 | frchain_now->frch_cfi_data->cfa_save_stack = p; |
| 364 | } |
| 365 | |
| 366 | void |
| 367 | cfi_add_CFA_restore_state (void) |
| 368 | { |
| 369 | struct cfa_save_data *p; |
| 370 | |
| 371 | cfi_add_CFA_insn (DW_CFA_restore_state); |
| 372 | |
| 373 | p = frchain_now->frch_cfi_data->cfa_save_stack; |
| 374 | if (p) |
| 375 | { |
| 376 | frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset; |
| 377 | frchain_now->frch_cfi_data->cfa_save_stack = p->next; |
| 378 | free (p); |
| 379 | } |
| 380 | else |
| 381 | as_bad (_("CFI state restore without previous remember")); |
| 382 | } |
| 383 | |
| 384 | \f |
| 385 | /* Parse CFI assembler directives. */ |
| 386 | |
| 387 | static void dot_cfi (int); |
| 388 | static void dot_cfi_escape (int); |
| 389 | static void dot_cfi_startproc (int); |
| 390 | static void dot_cfi_endproc (int); |
| 391 | static void dot_cfi_personality (int); |
| 392 | static void dot_cfi_lsda (int); |
| 393 | static void dot_cfi_val_encoded_addr (int); |
| 394 | |
| 395 | /* Fake CFI type; outside the byte range of any real CFI insn. */ |
| 396 | #define CFI_adjust_cfa_offset 0x100 |
| 397 | #define CFI_return_column 0x101 |
| 398 | #define CFI_rel_offset 0x102 |
| 399 | #define CFI_escape 0x103 |
| 400 | #define CFI_signal_frame 0x104 |
| 401 | #define CFI_val_encoded_addr 0x105 |
| 402 | |
| 403 | const pseudo_typeS cfi_pseudo_table[] = |
| 404 | { |
| 405 | { "cfi_startproc", dot_cfi_startproc, 0 }, |
| 406 | { "cfi_endproc", dot_cfi_endproc, 0 }, |
| 407 | { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, |
| 408 | { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, |
| 409 | { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, |
| 410 | { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, |
| 411 | { "cfi_offset", dot_cfi, DW_CFA_offset }, |
| 412 | { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, |
| 413 | { "cfi_register", dot_cfi, DW_CFA_register }, |
| 414 | { "cfi_return_column", dot_cfi, CFI_return_column }, |
| 415 | { "cfi_restore", dot_cfi, DW_CFA_restore }, |
| 416 | { "cfi_undefined", dot_cfi, DW_CFA_undefined }, |
| 417 | { "cfi_same_value", dot_cfi, DW_CFA_same_value }, |
| 418 | { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, |
| 419 | { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, |
| 420 | { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, |
| 421 | { "cfi_escape", dot_cfi_escape, 0 }, |
| 422 | { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, |
| 423 | { "cfi_personality", dot_cfi_personality, 0 }, |
| 424 | { "cfi_lsda", dot_cfi_lsda, 0 }, |
| 425 | { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 }, |
| 426 | { NULL, NULL, 0 } |
| 427 | }; |
| 428 | |
| 429 | static void |
| 430 | cfi_parse_separator (void) |
| 431 | { |
| 432 | SKIP_WHITESPACE (); |
| 433 | if (*input_line_pointer == ',') |
| 434 | input_line_pointer++; |
| 435 | else |
| 436 | as_bad (_("missing separator")); |
| 437 | } |
| 438 | |
| 439 | #ifndef tc_parse_to_dw2regnum |
| 440 | static void |
| 441 | tc_parse_to_dw2regnum(expressionS *exp) |
| 442 | { |
| 443 | # ifdef tc_regname_to_dw2regnum |
| 444 | SKIP_WHITESPACE (); |
| 445 | if (is_name_beginner (*input_line_pointer) |
| 446 | || (*input_line_pointer == '%' |
| 447 | && is_name_beginner (*++input_line_pointer))) |
| 448 | { |
| 449 | char *name, c; |
| 450 | |
| 451 | name = input_line_pointer; |
| 452 | c = get_symbol_end (); |
| 453 | |
| 454 | exp->X_op = O_constant; |
| 455 | exp->X_add_number = tc_regname_to_dw2regnum (name); |
| 456 | |
| 457 | *input_line_pointer = c; |
| 458 | } |
| 459 | else |
| 460 | # endif |
| 461 | expression_and_evaluate (exp); |
| 462 | } |
| 463 | #endif |
| 464 | |
| 465 | static unsigned |
| 466 | cfi_parse_reg (void) |
| 467 | { |
| 468 | int regno; |
| 469 | expressionS exp; |
| 470 | |
| 471 | tc_parse_to_dw2regnum (&exp); |
| 472 | switch (exp.X_op) |
| 473 | { |
| 474 | case O_register: |
| 475 | case O_constant: |
| 476 | regno = exp.X_add_number; |
| 477 | break; |
| 478 | |
| 479 | default: |
| 480 | regno = -1; |
| 481 | break; |
| 482 | } |
| 483 | |
| 484 | if (regno < 0) |
| 485 | { |
| 486 | as_bad (_("bad register expression")); |
| 487 | regno = 0; |
| 488 | } |
| 489 | |
| 490 | return regno; |
| 491 | } |
| 492 | |
| 493 | static offsetT |
| 494 | cfi_parse_const (void) |
| 495 | { |
| 496 | return get_absolute_expression (); |
| 497 | } |
| 498 | |
| 499 | static void |
| 500 | dot_cfi (int arg) |
| 501 | { |
| 502 | offsetT offset; |
| 503 | unsigned reg1, reg2; |
| 504 | |
| 505 | if (frchain_now->frch_cfi_data == NULL) |
| 506 | { |
| 507 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 508 | ignore_rest_of_line (); |
| 509 | return; |
| 510 | } |
| 511 | |
| 512 | /* If the last address was not at the current PC, advance to current. */ |
| 513 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 514 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 515 | != frag_now_fix ()) |
| 516 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 517 | |
| 518 | switch (arg) |
| 519 | { |
| 520 | case DW_CFA_offset: |
| 521 | reg1 = cfi_parse_reg (); |
| 522 | cfi_parse_separator (); |
| 523 | offset = cfi_parse_const (); |
| 524 | cfi_add_CFA_offset (reg1, offset); |
| 525 | break; |
| 526 | |
| 527 | case CFI_rel_offset: |
| 528 | reg1 = cfi_parse_reg (); |
| 529 | cfi_parse_separator (); |
| 530 | offset = cfi_parse_const (); |
| 531 | cfi_add_CFA_offset (reg1, |
| 532 | offset - frchain_now->frch_cfi_data->cur_cfa_offset); |
| 533 | break; |
| 534 | |
| 535 | case DW_CFA_def_cfa: |
| 536 | reg1 = cfi_parse_reg (); |
| 537 | cfi_parse_separator (); |
| 538 | offset = cfi_parse_const (); |
| 539 | cfi_add_CFA_def_cfa (reg1, offset); |
| 540 | break; |
| 541 | |
| 542 | case DW_CFA_register: |
| 543 | reg1 = cfi_parse_reg (); |
| 544 | cfi_parse_separator (); |
| 545 | reg2 = cfi_parse_reg (); |
| 546 | cfi_add_CFA_register (reg1, reg2); |
| 547 | break; |
| 548 | |
| 549 | case DW_CFA_def_cfa_register: |
| 550 | reg1 = cfi_parse_reg (); |
| 551 | cfi_add_CFA_def_cfa_register (reg1); |
| 552 | break; |
| 553 | |
| 554 | case DW_CFA_def_cfa_offset: |
| 555 | offset = cfi_parse_const (); |
| 556 | cfi_add_CFA_def_cfa_offset (offset); |
| 557 | break; |
| 558 | |
| 559 | case CFI_adjust_cfa_offset: |
| 560 | offset = cfi_parse_const (); |
| 561 | cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset |
| 562 | + offset); |
| 563 | break; |
| 564 | |
| 565 | case DW_CFA_restore: |
| 566 | for (;;) |
| 567 | { |
| 568 | reg1 = cfi_parse_reg (); |
| 569 | cfi_add_CFA_restore (reg1); |
| 570 | SKIP_WHITESPACE (); |
| 571 | if (*input_line_pointer != ',') |
| 572 | break; |
| 573 | ++input_line_pointer; |
| 574 | } |
| 575 | break; |
| 576 | |
| 577 | case DW_CFA_undefined: |
| 578 | for (;;) |
| 579 | { |
| 580 | reg1 = cfi_parse_reg (); |
| 581 | cfi_add_CFA_undefined (reg1); |
| 582 | SKIP_WHITESPACE (); |
| 583 | if (*input_line_pointer != ',') |
| 584 | break; |
| 585 | ++input_line_pointer; |
| 586 | } |
| 587 | break; |
| 588 | |
| 589 | case DW_CFA_same_value: |
| 590 | reg1 = cfi_parse_reg (); |
| 591 | cfi_add_CFA_same_value (reg1); |
| 592 | break; |
| 593 | |
| 594 | case CFI_return_column: |
| 595 | reg1 = cfi_parse_reg (); |
| 596 | cfi_set_return_column (reg1); |
| 597 | break; |
| 598 | |
| 599 | case DW_CFA_remember_state: |
| 600 | cfi_add_CFA_remember_state (); |
| 601 | break; |
| 602 | |
| 603 | case DW_CFA_restore_state: |
| 604 | cfi_add_CFA_restore_state (); |
| 605 | break; |
| 606 | |
| 607 | case DW_CFA_GNU_window_save: |
| 608 | cfi_add_CFA_insn (DW_CFA_GNU_window_save); |
| 609 | break; |
| 610 | |
| 611 | case CFI_signal_frame: |
| 612 | frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1; |
| 613 | break; |
| 614 | |
| 615 | default: |
| 616 | abort (); |
| 617 | } |
| 618 | |
| 619 | demand_empty_rest_of_line (); |
| 620 | } |
| 621 | |
| 622 | static void |
| 623 | dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) |
| 624 | { |
| 625 | struct cfi_escape_data *head, **tail, *e; |
| 626 | struct cfi_insn_data *insn; |
| 627 | |
| 628 | if (frchain_now->frch_cfi_data == NULL) |
| 629 | { |
| 630 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 631 | ignore_rest_of_line (); |
| 632 | return; |
| 633 | } |
| 634 | |
| 635 | /* If the last address was not at the current PC, advance to current. */ |
| 636 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 637 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 638 | != frag_now_fix ()) |
| 639 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 640 | |
| 641 | tail = &head; |
| 642 | do |
| 643 | { |
| 644 | e = (struct cfi_escape_data *) xmalloc (sizeof (*e)); |
| 645 | do_parse_cons_expression (&e->exp, 1); |
| 646 | *tail = e; |
| 647 | tail = &e->next; |
| 648 | } |
| 649 | while (*input_line_pointer++ == ','); |
| 650 | *tail = NULL; |
| 651 | |
| 652 | insn = alloc_cfi_insn_data (); |
| 653 | insn->insn = CFI_escape; |
| 654 | insn->u.esc = head; |
| 655 | |
| 656 | --input_line_pointer; |
| 657 | demand_empty_rest_of_line (); |
| 658 | } |
| 659 | |
| 660 | static void |
| 661 | dot_cfi_personality (int ignored ATTRIBUTE_UNUSED) |
| 662 | { |
| 663 | struct fde_entry *fde; |
| 664 | offsetT encoding; |
| 665 | |
| 666 | if (frchain_now->frch_cfi_data == NULL) |
| 667 | { |
| 668 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 669 | ignore_rest_of_line (); |
| 670 | return; |
| 671 | } |
| 672 | |
| 673 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
| 674 | encoding = cfi_parse_const (); |
| 675 | if (encoding == DW_EH_PE_omit) |
| 676 | { |
| 677 | demand_empty_rest_of_line (); |
| 678 | fde->per_encoding = encoding; |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | if ((encoding & 0xff) != encoding |
| 683 | || ((encoding & 0x70) != 0 |
| 684 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 685 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 686 | #endif |
| 687 | ) |
| 688 | /* leb128 can be handled, but does something actually need it? */ |
| 689 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 690 | || (encoding & 7) > DW_EH_PE_udata8) |
| 691 | { |
| 692 | as_bad (_("invalid or unsupported encoding in .cfi_personality")); |
| 693 | ignore_rest_of_line (); |
| 694 | return; |
| 695 | } |
| 696 | |
| 697 | if (*input_line_pointer++ != ',') |
| 698 | { |
| 699 | as_bad (_(".cfi_personality requires encoding and symbol arguments")); |
| 700 | ignore_rest_of_line (); |
| 701 | return; |
| 702 | } |
| 703 | |
| 704 | expression_and_evaluate (&fde->personality); |
| 705 | switch (fde->personality.X_op) |
| 706 | { |
| 707 | case O_symbol: |
| 708 | break; |
| 709 | case O_constant: |
| 710 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 711 | encoding = DW_EH_PE_omit; |
| 712 | break; |
| 713 | default: |
| 714 | encoding = DW_EH_PE_omit; |
| 715 | break; |
| 716 | } |
| 717 | |
| 718 | fde->per_encoding = encoding; |
| 719 | |
| 720 | if (encoding == DW_EH_PE_omit) |
| 721 | { |
| 722 | as_bad (_("wrong second argument to .cfi_personality")); |
| 723 | ignore_rest_of_line (); |
| 724 | return; |
| 725 | } |
| 726 | |
| 727 | demand_empty_rest_of_line (); |
| 728 | } |
| 729 | |
| 730 | static void |
| 731 | dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED) |
| 732 | { |
| 733 | struct fde_entry *fde; |
| 734 | offsetT encoding; |
| 735 | |
| 736 | if (frchain_now->frch_cfi_data == NULL) |
| 737 | { |
| 738 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 739 | ignore_rest_of_line (); |
| 740 | return; |
| 741 | } |
| 742 | |
| 743 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
| 744 | encoding = cfi_parse_const (); |
| 745 | if (encoding == DW_EH_PE_omit) |
| 746 | { |
| 747 | demand_empty_rest_of_line (); |
| 748 | fde->lsda_encoding = encoding; |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | if ((encoding & 0xff) != encoding |
| 753 | || ((encoding & 0x70) != 0 |
| 754 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 755 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 756 | #endif |
| 757 | ) |
| 758 | /* leb128 can be handled, but does something actually need it? */ |
| 759 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 760 | || (encoding & 7) > DW_EH_PE_udata8) |
| 761 | { |
| 762 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| 763 | ignore_rest_of_line (); |
| 764 | return; |
| 765 | } |
| 766 | |
| 767 | if (*input_line_pointer++ != ',') |
| 768 | { |
| 769 | as_bad (_(".cfi_lsda requires encoding and symbol arguments")); |
| 770 | ignore_rest_of_line (); |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | fde->lsda_encoding = encoding; |
| 775 | |
| 776 | expression_and_evaluate (&fde->lsda); |
| 777 | switch (fde->lsda.X_op) |
| 778 | { |
| 779 | case O_symbol: |
| 780 | break; |
| 781 | case O_constant: |
| 782 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 783 | encoding = DW_EH_PE_omit; |
| 784 | break; |
| 785 | default: |
| 786 | encoding = DW_EH_PE_omit; |
| 787 | break; |
| 788 | } |
| 789 | |
| 790 | fde->lsda_encoding = encoding; |
| 791 | |
| 792 | if (encoding == DW_EH_PE_omit) |
| 793 | { |
| 794 | as_bad (_("wrong second argument to .cfi_lsda")); |
| 795 | ignore_rest_of_line (); |
| 796 | return; |
| 797 | } |
| 798 | |
| 799 | demand_empty_rest_of_line (); |
| 800 | } |
| 801 | |
| 802 | static void |
| 803 | dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED) |
| 804 | { |
| 805 | struct cfi_insn_data *insn_ptr; |
| 806 | offsetT encoding; |
| 807 | |
| 808 | if (frchain_now->frch_cfi_data == NULL) |
| 809 | { |
| 810 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 811 | ignore_rest_of_line (); |
| 812 | return; |
| 813 | } |
| 814 | |
| 815 | /* If the last address was not at the current PC, advance to current. */ |
| 816 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 817 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 818 | != frag_now_fix ()) |
| 819 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 820 | |
| 821 | insn_ptr = alloc_cfi_insn_data (); |
| 822 | insn_ptr->insn = CFI_val_encoded_addr; |
| 823 | |
| 824 | insn_ptr->u.ea.reg = cfi_parse_reg (); |
| 825 | |
| 826 | cfi_parse_separator (); |
| 827 | encoding = cfi_parse_const (); |
| 828 | if ((encoding & 0xff) != encoding |
| 829 | || ((encoding & 0x70) != 0 |
| 830 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 831 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 832 | #endif |
| 833 | ) |
| 834 | /* leb128 can be handled, but does something actually need it? */ |
| 835 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 836 | || (encoding & 7) > DW_EH_PE_udata8) |
| 837 | { |
| 838 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| 839 | encoding = DW_EH_PE_omit; |
| 840 | } |
| 841 | |
| 842 | cfi_parse_separator (); |
| 843 | expression_and_evaluate (&insn_ptr->u.ea.exp); |
| 844 | switch (insn_ptr->u.ea.exp.X_op) |
| 845 | { |
| 846 | case O_symbol: |
| 847 | break; |
| 848 | case O_constant: |
| 849 | if ((encoding & 0x70) != DW_EH_PE_pcrel) |
| 850 | break; |
| 851 | default: |
| 852 | encoding = DW_EH_PE_omit; |
| 853 | break; |
| 854 | } |
| 855 | |
| 856 | insn_ptr->u.ea.encoding = encoding; |
| 857 | if (encoding == DW_EH_PE_omit) |
| 858 | { |
| 859 | as_bad (_("wrong third argument to .cfi_val_encoded_addr")); |
| 860 | ignore_rest_of_line (); |
| 861 | return; |
| 862 | } |
| 863 | |
| 864 | demand_empty_rest_of_line (); |
| 865 | } |
| 866 | |
| 867 | static void |
| 868 | dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) |
| 869 | { |
| 870 | int simple = 0; |
| 871 | |
| 872 | if (frchain_now->frch_cfi_data != NULL) |
| 873 | { |
| 874 | as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); |
| 875 | ignore_rest_of_line (); |
| 876 | return; |
| 877 | } |
| 878 | |
| 879 | cfi_new_fde (symbol_temp_new_now ()); |
| 880 | |
| 881 | SKIP_WHITESPACE (); |
| 882 | if (is_name_beginner (*input_line_pointer)) |
| 883 | { |
| 884 | char *name, c; |
| 885 | |
| 886 | name = input_line_pointer; |
| 887 | c = get_symbol_end (); |
| 888 | |
| 889 | if (strcmp (name, "simple") == 0) |
| 890 | { |
| 891 | simple = 1; |
| 892 | *input_line_pointer = c; |
| 893 | } |
| 894 | else |
| 895 | input_line_pointer = name; |
| 896 | } |
| 897 | demand_empty_rest_of_line (); |
| 898 | |
| 899 | frchain_now->frch_cfi_data->cur_cfa_offset = 0; |
| 900 | if (!simple) |
| 901 | tc_cfi_frame_initial_instructions (); |
| 902 | } |
| 903 | |
| 904 | static void |
| 905 | dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) |
| 906 | { |
| 907 | if (frchain_now->frch_cfi_data == NULL) |
| 908 | { |
| 909 | as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); |
| 910 | ignore_rest_of_line (); |
| 911 | return; |
| 912 | } |
| 913 | |
| 914 | cfi_end_fde (symbol_temp_new_now ()); |
| 915 | |
| 916 | demand_empty_rest_of_line (); |
| 917 | } |
| 918 | |
| 919 | \f |
| 920 | /* Emit a single byte into the current segment. */ |
| 921 | |
| 922 | static inline void |
| 923 | out_one (int byte) |
| 924 | { |
| 925 | FRAG_APPEND_1_CHAR (byte); |
| 926 | } |
| 927 | |
| 928 | /* Emit a two-byte word into the current segment. */ |
| 929 | |
| 930 | static inline void |
| 931 | out_two (int data) |
| 932 | { |
| 933 | md_number_to_chars (frag_more (2), data, 2); |
| 934 | } |
| 935 | |
| 936 | /* Emit a four byte word into the current segment. */ |
| 937 | |
| 938 | static inline void |
| 939 | out_four (int data) |
| 940 | { |
| 941 | md_number_to_chars (frag_more (4), data, 4); |
| 942 | } |
| 943 | |
| 944 | /* Emit an unsigned "little-endian base 128" number. */ |
| 945 | |
| 946 | static void |
| 947 | out_uleb128 (addressT value) |
| 948 | { |
| 949 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
| 950 | } |
| 951 | |
| 952 | /* Emit an unsigned "little-endian base 128" number. */ |
| 953 | |
| 954 | static void |
| 955 | out_sleb128 (offsetT value) |
| 956 | { |
| 957 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
| 958 | } |
| 959 | |
| 960 | static void |
| 961 | output_cfi_insn (struct cfi_insn_data *insn) |
| 962 | { |
| 963 | offsetT offset; |
| 964 | unsigned int regno; |
| 965 | |
| 966 | switch (insn->insn) |
| 967 | { |
| 968 | case DW_CFA_advance_loc: |
| 969 | { |
| 970 | symbolS *from = insn->u.ll.lab1; |
| 971 | symbolS *to = insn->u.ll.lab2; |
| 972 | |
| 973 | if (symbol_get_frag (to) == symbol_get_frag (from)) |
| 974 | { |
| 975 | addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); |
| 976 | addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; |
| 977 | |
| 978 | if (scaled <= 0x3F) |
| 979 | out_one (DW_CFA_advance_loc + scaled); |
| 980 | else if (scaled <= 0xFF) |
| 981 | { |
| 982 | out_one (DW_CFA_advance_loc1); |
| 983 | out_one (scaled); |
| 984 | } |
| 985 | else if (scaled <= 0xFFFF) |
| 986 | { |
| 987 | out_one (DW_CFA_advance_loc2); |
| 988 | out_two (scaled); |
| 989 | } |
| 990 | else |
| 991 | { |
| 992 | out_one (DW_CFA_advance_loc4); |
| 993 | out_four (scaled); |
| 994 | } |
| 995 | } |
| 996 | else |
| 997 | { |
| 998 | expressionS exp; |
| 999 | |
| 1000 | exp.X_op = O_subtract; |
| 1001 | exp.X_add_symbol = to; |
| 1002 | exp.X_op_symbol = from; |
| 1003 | exp.X_add_number = 0; |
| 1004 | |
| 1005 | /* The code in ehopt.c expects that one byte of the encoding |
| 1006 | is already allocated to the frag. This comes from the way |
| 1007 | that it scans the .eh_frame section looking first for the |
| 1008 | .byte DW_CFA_advance_loc4. */ |
| 1009 | *frag_more (1) = DW_CFA_advance_loc4; |
| 1010 | |
| 1011 | frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, |
| 1012 | make_expr_symbol (&exp), frag_now_fix () - 1, |
| 1013 | (char *) frag_now); |
| 1014 | } |
| 1015 | } |
| 1016 | break; |
| 1017 | |
| 1018 | case DW_CFA_def_cfa: |
| 1019 | offset = insn->u.ri.offset; |
| 1020 | if (offset < 0) |
| 1021 | { |
| 1022 | out_one (DW_CFA_def_cfa_sf); |
| 1023 | out_uleb128 (insn->u.ri.reg); |
| 1024 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| 1025 | } |
| 1026 | else |
| 1027 | { |
| 1028 | out_one (DW_CFA_def_cfa); |
| 1029 | out_uleb128 (insn->u.ri.reg); |
| 1030 | out_uleb128 (offset); |
| 1031 | } |
| 1032 | break; |
| 1033 | |
| 1034 | case DW_CFA_def_cfa_register: |
| 1035 | case DW_CFA_undefined: |
| 1036 | case DW_CFA_same_value: |
| 1037 | out_one (insn->insn); |
| 1038 | out_uleb128 (insn->u.r); |
| 1039 | break; |
| 1040 | |
| 1041 | case DW_CFA_def_cfa_offset: |
| 1042 | offset = insn->u.i; |
| 1043 | if (offset < 0) |
| 1044 | { |
| 1045 | out_one (DW_CFA_def_cfa_offset_sf); |
| 1046 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| 1047 | } |
| 1048 | else |
| 1049 | { |
| 1050 | out_one (DW_CFA_def_cfa_offset); |
| 1051 | out_uleb128 (offset); |
| 1052 | } |
| 1053 | break; |
| 1054 | |
| 1055 | case DW_CFA_restore: |
| 1056 | regno = insn->u.r; |
| 1057 | if (regno <= 0x3F) |
| 1058 | { |
| 1059 | out_one (DW_CFA_restore + regno); |
| 1060 | } |
| 1061 | else |
| 1062 | { |
| 1063 | out_one (DW_CFA_restore_extended); |
| 1064 | out_uleb128 (regno); |
| 1065 | } |
| 1066 | break; |
| 1067 | |
| 1068 | case DW_CFA_offset: |
| 1069 | regno = insn->u.ri.reg; |
| 1070 | offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
| 1071 | if (offset < 0) |
| 1072 | { |
| 1073 | out_one (DW_CFA_offset_extended_sf); |
| 1074 | out_uleb128 (regno); |
| 1075 | out_sleb128 (offset); |
| 1076 | } |
| 1077 | else if (regno <= 0x3F) |
| 1078 | { |
| 1079 | out_one (DW_CFA_offset + regno); |
| 1080 | out_uleb128 (offset); |
| 1081 | } |
| 1082 | else |
| 1083 | { |
| 1084 | out_one (DW_CFA_offset_extended); |
| 1085 | out_uleb128 (regno); |
| 1086 | out_uleb128 (offset); |
| 1087 | } |
| 1088 | break; |
| 1089 | |
| 1090 | case DW_CFA_register: |
| 1091 | out_one (DW_CFA_register); |
| 1092 | out_uleb128 (insn->u.rr.reg1); |
| 1093 | out_uleb128 (insn->u.rr.reg2); |
| 1094 | break; |
| 1095 | |
| 1096 | case DW_CFA_remember_state: |
| 1097 | case DW_CFA_restore_state: |
| 1098 | out_one (insn->insn); |
| 1099 | break; |
| 1100 | |
| 1101 | case DW_CFA_GNU_window_save: |
| 1102 | out_one (DW_CFA_GNU_window_save); |
| 1103 | break; |
| 1104 | |
| 1105 | case CFI_escape: |
| 1106 | { |
| 1107 | struct cfi_escape_data *e; |
| 1108 | for (e = insn->u.esc; e ; e = e->next) |
| 1109 | emit_expr (&e->exp, 1); |
| 1110 | break; |
| 1111 | } |
| 1112 | |
| 1113 | case CFI_val_encoded_addr: |
| 1114 | { |
| 1115 | unsigned encoding = insn->u.ea.encoding; |
| 1116 | offsetT encoding_size; |
| 1117 | |
| 1118 | if (encoding == DW_EH_PE_omit) |
| 1119 | break; |
| 1120 | out_one (DW_CFA_val_expression); |
| 1121 | out_uleb128 (insn->u.ea.reg); |
| 1122 | |
| 1123 | switch (encoding & 0x7) |
| 1124 | { |
| 1125 | case DW_EH_PE_absptr: |
| 1126 | encoding_size = DWARF2_ADDR_SIZE (stdoutput); |
| 1127 | break; |
| 1128 | case DW_EH_PE_udata2: |
| 1129 | encoding_size = 2; |
| 1130 | break; |
| 1131 | case DW_EH_PE_udata4: |
| 1132 | encoding_size = 4; |
| 1133 | break; |
| 1134 | case DW_EH_PE_udata8: |
| 1135 | encoding_size = 8; |
| 1136 | break; |
| 1137 | default: |
| 1138 | abort (); |
| 1139 | } |
| 1140 | |
| 1141 | /* If the user has requested absolute encoding, |
| 1142 | then use the smaller DW_OP_addr encoding. */ |
| 1143 | if (insn->u.ea.encoding == DW_EH_PE_absptr) |
| 1144 | { |
| 1145 | out_uleb128 (1 + encoding_size); |
| 1146 | out_one (DW_OP_addr); |
| 1147 | } |
| 1148 | else |
| 1149 | { |
| 1150 | out_uleb128 (1 + 1 + encoding_size); |
| 1151 | out_one (DW_OP_GNU_encoded_addr); |
| 1152 | out_one (encoding); |
| 1153 | |
| 1154 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 1155 | { |
| 1156 | #if CFI_DIFF_EXPR_OK |
| 1157 | insn->u.ea.exp.X_op = O_subtract; |
| 1158 | insn->u.ea.exp.X_op_symbol = symbol_temp_new_now (); |
| 1159 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1160 | tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, encoding_size); |
| 1161 | break; |
| 1162 | #else |
| 1163 | abort (); |
| 1164 | #endif |
| 1165 | } |
| 1166 | } |
| 1167 | emit_expr (&insn->u.ea.exp, encoding_size); |
| 1168 | } |
| 1169 | break; |
| 1170 | |
| 1171 | default: |
| 1172 | abort (); |
| 1173 | } |
| 1174 | } |
| 1175 | |
| 1176 | static offsetT |
| 1177 | encoding_size (unsigned char encoding) |
| 1178 | { |
| 1179 | if (encoding == DW_EH_PE_omit) |
| 1180 | return 0; |
| 1181 | switch (encoding & 0x7) |
| 1182 | { |
| 1183 | case 0: |
| 1184 | return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4; |
| 1185 | case DW_EH_PE_udata2: |
| 1186 | return 2; |
| 1187 | case DW_EH_PE_udata4: |
| 1188 | return 4; |
| 1189 | case DW_EH_PE_udata8: |
| 1190 | return 8; |
| 1191 | default: |
| 1192 | abort (); |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | static void |
| 1197 | output_cie (struct cie_entry *cie) |
| 1198 | { |
| 1199 | symbolS *after_size_address, *end_address; |
| 1200 | expressionS exp; |
| 1201 | struct cfi_insn_data *i; |
| 1202 | offsetT augmentation_size; |
| 1203 | int enc; |
| 1204 | |
| 1205 | cie->start_address = symbol_temp_new_now (); |
| 1206 | after_size_address = symbol_temp_make (); |
| 1207 | end_address = symbol_temp_make (); |
| 1208 | |
| 1209 | exp.X_op = O_subtract; |
| 1210 | exp.X_add_symbol = end_address; |
| 1211 | exp.X_op_symbol = after_size_address; |
| 1212 | exp.X_add_number = 0; |
| 1213 | |
| 1214 | emit_expr (&exp, 4); /* Length. */ |
| 1215 | symbol_set_value_now (after_size_address); |
| 1216 | out_four (0); /* CIE id. */ |
| 1217 | out_one (DW_CIE_VERSION); /* Version. */ |
| 1218 | out_one ('z'); /* Augmentation. */ |
| 1219 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1220 | out_one ('P'); |
| 1221 | if (cie->lsda_encoding != DW_EH_PE_omit) |
| 1222 | out_one ('L'); |
| 1223 | out_one ('R'); |
| 1224 | if (cie->signal_frame) |
| 1225 | out_one ('S'); |
| 1226 | out_one (0); |
| 1227 | out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ |
| 1228 | out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ |
| 1229 | if (DW_CIE_VERSION == 1) /* Return column. */ |
| 1230 | out_one (cie->return_column); |
| 1231 | else |
| 1232 | out_uleb128 (cie->return_column); |
| 1233 | augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit); |
| 1234 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1235 | augmentation_size += 1 + encoding_size (cie->per_encoding); |
| 1236 | out_uleb128 (augmentation_size); /* Augmentation size. */ |
| 1237 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1238 | { |
| 1239 | offsetT size = encoding_size (cie->per_encoding); |
| 1240 | out_one (cie->per_encoding); |
| 1241 | exp = cie->personality; |
| 1242 | if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel) |
| 1243 | { |
| 1244 | #if CFI_DIFF_EXPR_OK |
| 1245 | exp.X_op = O_subtract; |
| 1246 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1247 | emit_expr (&exp, size); |
| 1248 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1249 | tc_cfi_emit_pcrel_expr (&exp, size); |
| 1250 | #else |
| 1251 | abort (); |
| 1252 | #endif |
| 1253 | } |
| 1254 | else |
| 1255 | emit_expr (&exp, size); |
| 1256 | } |
| 1257 | if (cie->lsda_encoding != DW_EH_PE_omit) |
| 1258 | out_one (cie->lsda_encoding); |
| 1259 | |
| 1260 | switch (DWARF2_FDE_RELOC_SIZE) |
| 1261 | { |
| 1262 | case 2: |
| 1263 | enc = DW_EH_PE_sdata2; |
| 1264 | break; |
| 1265 | case 4: |
| 1266 | enc = DW_EH_PE_sdata4; |
| 1267 | break; |
| 1268 | case 8: |
| 1269 | enc = DW_EH_PE_sdata8; |
| 1270 | break; |
| 1271 | default: |
| 1272 | abort (); |
| 1273 | } |
| 1274 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 1275 | enc |= DW_EH_PE_pcrel; |
| 1276 | #endif |
| 1277 | out_one (enc); |
| 1278 | |
| 1279 | if (cie->first) |
| 1280 | for (i = cie->first; i != cie->last; i = i->next) |
| 1281 | output_cfi_insn (i); |
| 1282 | |
| 1283 | frag_align (2, DW_CFA_nop, 0); |
| 1284 | symbol_set_value_now (end_address); |
| 1285 | } |
| 1286 | |
| 1287 | static void |
| 1288 | output_fde (struct fde_entry *fde, struct cie_entry *cie, |
| 1289 | struct cfi_insn_data *first, int align) |
| 1290 | { |
| 1291 | symbolS *after_size_address, *end_address; |
| 1292 | expressionS exp; |
| 1293 | offsetT augmentation_size; |
| 1294 | |
| 1295 | after_size_address = symbol_temp_make (); |
| 1296 | end_address = symbol_temp_make (); |
| 1297 | |
| 1298 | exp.X_op = O_subtract; |
| 1299 | exp.X_add_symbol = end_address; |
| 1300 | exp.X_op_symbol = after_size_address; |
| 1301 | exp.X_add_number = 0; |
| 1302 | emit_expr (&exp, 4); /* Length. */ |
| 1303 | symbol_set_value_now (after_size_address); |
| 1304 | |
| 1305 | exp.X_add_symbol = after_size_address; |
| 1306 | exp.X_op_symbol = cie->start_address; |
| 1307 | emit_expr (&exp, 4); /* CIE offset. */ |
| 1308 | |
| 1309 | #if CFI_DIFF_EXPR_OK |
| 1310 | exp.X_add_symbol = fde->start_address; |
| 1311 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1312 | emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1313 | #else |
| 1314 | exp.X_op = O_symbol; |
| 1315 | exp.X_add_symbol = fde->start_address; |
| 1316 | exp.X_op_symbol = NULL; |
| 1317 | #ifdef tc_cfi_emit_pcrel_expr |
| 1318 | tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1319 | #else |
| 1320 | emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1321 | #endif |
| 1322 | exp.X_op = O_subtract; |
| 1323 | #endif |
| 1324 | |
| 1325 | exp.X_add_symbol = fde->end_address; |
| 1326 | exp.X_op_symbol = fde->start_address; /* Code length. */ |
| 1327 | emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); |
| 1328 | |
| 1329 | augmentation_size = encoding_size (fde->lsda_encoding); |
| 1330 | out_uleb128 (augmentation_size); /* Augmentation size. */ |
| 1331 | |
| 1332 | if (fde->lsda_encoding != DW_EH_PE_omit) |
| 1333 | { |
| 1334 | exp = fde->lsda; |
| 1335 | if ((fde->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
| 1336 | { |
| 1337 | #if CFI_DIFF_EXPR_OK |
| 1338 | exp.X_op = O_subtract; |
| 1339 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1340 | emit_expr (&exp, augmentation_size); |
| 1341 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1342 | tc_cfi_emit_pcrel_expr (&exp, augmentation_size); |
| 1343 | #else |
| 1344 | abort (); |
| 1345 | #endif |
| 1346 | } |
| 1347 | else |
| 1348 | emit_expr (&exp, augmentation_size); |
| 1349 | } |
| 1350 | |
| 1351 | for (; first; first = first->next) |
| 1352 | output_cfi_insn (first); |
| 1353 | |
| 1354 | frag_align (align, DW_CFA_nop, 0); |
| 1355 | symbol_set_value_now (end_address); |
| 1356 | } |
| 1357 | |
| 1358 | static struct cie_entry * |
| 1359 | select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) |
| 1360 | { |
| 1361 | struct cfi_insn_data *i, *j; |
| 1362 | struct cie_entry *cie; |
| 1363 | |
| 1364 | for (cie = cie_root; cie; cie = cie->next) |
| 1365 | { |
| 1366 | if (cie->return_column != fde->return_column |
| 1367 | || cie->signal_frame != fde->signal_frame |
| 1368 | || cie->per_encoding != fde->per_encoding |
| 1369 | || cie->lsda_encoding != fde->lsda_encoding) |
| 1370 | continue; |
| 1371 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1372 | { |
| 1373 | if (cie->personality.X_op != fde->personality.X_op |
| 1374 | || cie->personality.X_add_number |
| 1375 | != fde->personality.X_add_number) |
| 1376 | continue; |
| 1377 | switch (cie->personality.X_op) |
| 1378 | { |
| 1379 | case O_constant: |
| 1380 | if (cie->personality.X_unsigned != fde->personality.X_unsigned) |
| 1381 | continue; |
| 1382 | break; |
| 1383 | case O_symbol: |
| 1384 | if (cie->personality.X_add_symbol |
| 1385 | != fde->personality.X_add_symbol) |
| 1386 | continue; |
| 1387 | break; |
| 1388 | default: |
| 1389 | abort (); |
| 1390 | } |
| 1391 | } |
| 1392 | for (i = cie->first, j = fde->data; |
| 1393 | i != cie->last && j != NULL; |
| 1394 | i = i->next, j = j->next) |
| 1395 | { |
| 1396 | if (i->insn != j->insn) |
| 1397 | goto fail; |
| 1398 | switch (i->insn) |
| 1399 | { |
| 1400 | case DW_CFA_advance_loc: |
| 1401 | case DW_CFA_remember_state: |
| 1402 | /* We reached the first advance/remember in the FDE, |
| 1403 | but did not reach the end of the CIE list. */ |
| 1404 | goto fail; |
| 1405 | |
| 1406 | case DW_CFA_offset: |
| 1407 | case DW_CFA_def_cfa: |
| 1408 | if (i->u.ri.reg != j->u.ri.reg) |
| 1409 | goto fail; |
| 1410 | if (i->u.ri.offset != j->u.ri.offset) |
| 1411 | goto fail; |
| 1412 | break; |
| 1413 | |
| 1414 | case DW_CFA_register: |
| 1415 | if (i->u.rr.reg1 != j->u.rr.reg1) |
| 1416 | goto fail; |
| 1417 | if (i->u.rr.reg2 != j->u.rr.reg2) |
| 1418 | goto fail; |
| 1419 | break; |
| 1420 | |
| 1421 | case DW_CFA_def_cfa_register: |
| 1422 | case DW_CFA_restore: |
| 1423 | case DW_CFA_undefined: |
| 1424 | case DW_CFA_same_value: |
| 1425 | if (i->u.r != j->u.r) |
| 1426 | goto fail; |
| 1427 | break; |
| 1428 | |
| 1429 | case DW_CFA_def_cfa_offset: |
| 1430 | if (i->u.i != j->u.i) |
| 1431 | goto fail; |
| 1432 | break; |
| 1433 | |
| 1434 | case CFI_escape: |
| 1435 | case CFI_val_encoded_addr: |
| 1436 | /* Don't bother matching these for now. */ |
| 1437 | goto fail; |
| 1438 | |
| 1439 | default: |
| 1440 | abort (); |
| 1441 | } |
| 1442 | } |
| 1443 | |
| 1444 | /* Success if we reached the end of the CIE list, and we've either |
| 1445 | run out of FDE entries or we've encountered an advance, |
| 1446 | remember, or escape. */ |
| 1447 | if (i == cie->last |
| 1448 | && (!j |
| 1449 | || j->insn == DW_CFA_advance_loc |
| 1450 | || j->insn == DW_CFA_remember_state |
| 1451 | || j->insn == CFI_escape |
| 1452 | || j->insn == CFI_val_encoded_addr)) |
| 1453 | { |
| 1454 | *pfirst = j; |
| 1455 | return cie; |
| 1456 | } |
| 1457 | |
| 1458 | fail:; |
| 1459 | } |
| 1460 | |
| 1461 | cie = (struct cie_entry *) xmalloc (sizeof (struct cie_entry)); |
| 1462 | cie->next = cie_root; |
| 1463 | cie_root = cie; |
| 1464 | cie->return_column = fde->return_column; |
| 1465 | cie->signal_frame = fde->signal_frame; |
| 1466 | cie->per_encoding = fde->per_encoding; |
| 1467 | cie->lsda_encoding = fde->lsda_encoding; |
| 1468 | cie->personality = fde->personality; |
| 1469 | cie->first = fde->data; |
| 1470 | |
| 1471 | for (i = cie->first; i ; i = i->next) |
| 1472 | if (i->insn == DW_CFA_advance_loc |
| 1473 | || i->insn == DW_CFA_remember_state |
| 1474 | || i->insn == CFI_escape |
| 1475 | || i->insn == CFI_val_encoded_addr) |
| 1476 | break; |
| 1477 | |
| 1478 | cie->last = i; |
| 1479 | *pfirst = i; |
| 1480 | |
| 1481 | output_cie (cie); |
| 1482 | |
| 1483 | return cie; |
| 1484 | } |
| 1485 | |
| 1486 | void |
| 1487 | cfi_finish (void) |
| 1488 | { |
| 1489 | segT cfi_seg; |
| 1490 | struct fde_entry *fde; |
| 1491 | int save_flag_traditional_format; |
| 1492 | |
| 1493 | if (all_fde_data == 0) |
| 1494 | return; |
| 1495 | |
| 1496 | /* Open .eh_frame section. */ |
| 1497 | cfi_seg = subseg_new (".eh_frame", 0); |
| 1498 | bfd_set_section_flags (stdoutput, cfi_seg, |
| 1499 | SEC_ALLOC | SEC_LOAD | SEC_DATA |
| 1500 | | DWARF2_EH_FRAME_READ_ONLY); |
| 1501 | subseg_set (cfi_seg, 0); |
| 1502 | record_alignment (cfi_seg, EH_FRAME_ALIGNMENT); |
| 1503 | |
| 1504 | #ifdef md_fix_up_eh_frame |
| 1505 | md_fix_up_eh_frame (cfi_seg); |
| 1506 | #endif |
| 1507 | |
| 1508 | /* Make sure check_eh_frame doesn't do anything with our output. */ |
| 1509 | save_flag_traditional_format = flag_traditional_format; |
| 1510 | flag_traditional_format = 1; |
| 1511 | |
| 1512 | for (fde = all_fde_data; fde ; fde = fde->next) |
| 1513 | { |
| 1514 | struct cfi_insn_data *first; |
| 1515 | struct cie_entry *cie; |
| 1516 | |
| 1517 | if (fde->end_address == NULL) |
| 1518 | { |
| 1519 | as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); |
| 1520 | fde->end_address = fde->start_address; |
| 1521 | } |
| 1522 | |
| 1523 | cie = select_cie_for_fde (fde, &first); |
| 1524 | output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); |
| 1525 | } |
| 1526 | |
| 1527 | flag_traditional_format = save_flag_traditional_format; |
| 1528 | } |
| 1529 | |
| 1530 | #else /* TARGET_USE_CFIPOP */ |
| 1531 | void |
| 1532 | cfi_finish (void) |
| 1533 | { |
| 1534 | } |
| 1535 | #endif /* TARGET_USE_CFIPOP */ |