| 1 | /* dw2gencfi.c - Support for generating Dwarf2 CFI information. |
| 2 | Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| 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 | #include "dwarf2dbg.h" |
| 27 | |
| 28 | #ifdef TARGET_USE_CFIPOP |
| 29 | |
| 30 | /* By default, use difference expressions if DIFF_EXPR_OK is defined. */ |
| 31 | #ifndef CFI_DIFF_EXPR_OK |
| 32 | # ifdef DIFF_EXPR_OK |
| 33 | # define CFI_DIFF_EXPR_OK 1 |
| 34 | # else |
| 35 | # define CFI_DIFF_EXPR_OK 0 |
| 36 | # endif |
| 37 | #endif |
| 38 | |
| 39 | #ifndef CFI_DIFF_LSDA_OK |
| 40 | #define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK |
| 41 | #endif |
| 42 | |
| 43 | #if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0 |
| 44 | # error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK" |
| 45 | #endif |
| 46 | |
| 47 | /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field |
| 48 | of the CIE. Default to 1 if not otherwise specified. */ |
| 49 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
| 50 | #define DWARF2_LINE_MIN_INSN_LENGTH 1 |
| 51 | #endif |
| 52 | |
| 53 | /* By default, use 32-bit relocations from .eh_frame into .text. */ |
| 54 | #ifndef DWARF2_FDE_RELOC_SIZE |
| 55 | #define DWARF2_FDE_RELOC_SIZE 4 |
| 56 | #endif |
| 57 | |
| 58 | /* By default, use a read-only .eh_frame section. */ |
| 59 | #ifndef DWARF2_EH_FRAME_READ_ONLY |
| 60 | #define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY |
| 61 | #endif |
| 62 | |
| 63 | #ifndef EH_FRAME_ALIGNMENT |
| 64 | #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) |
| 65 | #endif |
| 66 | |
| 67 | #ifndef tc_cfi_frame_initial_instructions |
| 68 | #define tc_cfi_frame_initial_instructions() ((void)0) |
| 69 | #endif |
| 70 | |
| 71 | #ifndef tc_cfi_startproc |
| 72 | # define tc_cfi_startproc() ((void)0) |
| 73 | #endif |
| 74 | |
| 75 | #ifndef tc_cfi_endproc |
| 76 | # define tc_cfi_endproc(fde) ((void) (fde)) |
| 77 | #endif |
| 78 | |
| 79 | #ifndef DWARF2_FORMAT |
| 80 | #define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
| 81 | #endif |
| 82 | |
| 83 | #ifndef DWARF2_ADDR_SIZE |
| 84 | #define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
| 85 | #endif |
| 86 | |
| 87 | #if SUPPORT_FRAME_LINKONCE |
| 88 | #define CUR_SEG(structp) structp->cur_seg |
| 89 | #define SET_CUR_SEG(structp, seg) structp->cur_seg = seg |
| 90 | #define HANDLED(structp) structp->handled |
| 91 | #define SET_HANDLED(structp, val) structp->handled = val |
| 92 | #else |
| 93 | #define CUR_SEG(structp) NULL |
| 94 | #define SET_CUR_SEG(structp, seg) (void) (0 && seg) |
| 95 | #define HANDLED(structp) 0 |
| 96 | #define SET_HANDLED(structp, val) (void) (0 && val) |
| 97 | #endif |
| 98 | |
| 99 | /* Private segment collection list. */ |
| 100 | struct dwcfi_seg_list |
| 101 | { |
| 102 | segT seg; |
| 103 | int subseg; |
| 104 | char * seg_name; |
| 105 | }; |
| 106 | |
| 107 | #define FRAME_NAME ".eh_frame" |
| 108 | |
| 109 | static struct hash_control *dwcfi_hash; |
| 110 | |
| 111 | /* Build based on segment the derived .debug_... |
| 112 | segment name containing origin segment's postfix name part. */ |
| 113 | |
| 114 | static char * |
| 115 | get_debugseg_name (segT seg, const char *base_name) |
| 116 | { |
| 117 | const char *name; |
| 118 | |
| 119 | if (!seg) |
| 120 | name = ""; |
| 121 | else |
| 122 | { |
| 123 | const char * dollar; |
| 124 | const char * dot; |
| 125 | |
| 126 | name = bfd_get_section_name (stdoutput, seg); |
| 127 | |
| 128 | dollar = strchr (name, '$'); |
| 129 | dot = strchr (name + 1, '.'); |
| 130 | |
| 131 | if (!dollar && !dot) |
| 132 | name = ""; |
| 133 | else if (!dollar) |
| 134 | name = dot; |
| 135 | else if (!dot) |
| 136 | name = dollar; |
| 137 | else if (dot < dollar) |
| 138 | name = dot; |
| 139 | else |
| 140 | name = dollar; |
| 141 | } |
| 142 | |
| 143 | return concat (base_name, name, NULL); |
| 144 | } |
| 145 | |
| 146 | /* Allocate a dwcfi_seg_list structure. */ |
| 147 | |
| 148 | static struct dwcfi_seg_list * |
| 149 | alloc_debugseg_item (segT seg, int subseg, char *name) |
| 150 | { |
| 151 | struct dwcfi_seg_list *r; |
| 152 | |
| 153 | r = (struct dwcfi_seg_list *) |
| 154 | xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name)); |
| 155 | r->seg = seg; |
| 156 | r->subseg = subseg; |
| 157 | r->seg_name = name; |
| 158 | return r; |
| 159 | } |
| 160 | |
| 161 | static segT |
| 162 | is_now_linkonce_segment (void) |
| 163 | { |
| 164 | if ((bfd_get_section_flags (stdoutput, now_seg) |
| 165 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| 166 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
| 167 | | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0) |
| 168 | return now_seg; |
| 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | /* Generate debug... segment with same linkonce properties |
| 173 | of based segment. */ |
| 174 | |
| 175 | static segT |
| 176 | make_debug_seg (segT cseg, char *name, int sflags) |
| 177 | { |
| 178 | segT save_seg = now_seg; |
| 179 | int save_subseg = now_subseg; |
| 180 | segT r; |
| 181 | flagword flags; |
| 182 | |
| 183 | r = subseg_new (name, 0); |
| 184 | |
| 185 | /* Check if code segment is marked as linked once. */ |
| 186 | if (!cseg) |
| 187 | flags = 0; |
| 188 | else |
| 189 | flags = bfd_get_section_flags (stdoutput, cseg) |
| 190 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| 191 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
| 192 | | SEC_LINK_DUPLICATES_SAME_CONTENTS); |
| 193 | |
| 194 | /* Add standard section flags. */ |
| 195 | flags |= sflags; |
| 196 | |
| 197 | /* Apply possibly linked once flags to new generated segment, too. */ |
| 198 | if (!bfd_set_section_flags (stdoutput, r, flags)) |
| 199 | as_bad (_("bfd_set_section_flags: %s"), |
| 200 | bfd_errmsg (bfd_get_error ())); |
| 201 | |
| 202 | /* Restore to previous segment. */ |
| 203 | if (save_seg != NULL) |
| 204 | subseg_set (save_seg, save_subseg); |
| 205 | return r; |
| 206 | } |
| 207 | |
| 208 | static void |
| 209 | dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item) |
| 210 | { |
| 211 | const char *error_string; |
| 212 | |
| 213 | if ((error_string = hash_jam (dwcfi_hash, name, (char *) item))) |
| 214 | as_fatal (_("Inserting \"%s\" into structure table failed: %s"), |
| 215 | name, error_string); |
| 216 | } |
| 217 | |
| 218 | static struct dwcfi_seg_list * |
| 219 | dwcfi_hash_find (char *name) |
| 220 | { |
| 221 | return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name); |
| 222 | } |
| 223 | |
| 224 | static struct dwcfi_seg_list * |
| 225 | dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags) |
| 226 | { |
| 227 | struct dwcfi_seg_list *item; |
| 228 | char *name; |
| 229 | |
| 230 | /* Initialize dwcfi_hash once. */ |
| 231 | if (!dwcfi_hash) |
| 232 | dwcfi_hash = hash_new (); |
| 233 | |
| 234 | name = get_debugseg_name (cseg, base_name); |
| 235 | |
| 236 | item = dwcfi_hash_find (name); |
| 237 | if (!item) |
| 238 | { |
| 239 | item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name); |
| 240 | |
| 241 | dwcfi_hash_insert (item->seg_name, item); |
| 242 | } |
| 243 | else |
| 244 | free (name); |
| 245 | |
| 246 | return item; |
| 247 | } |
| 248 | |
| 249 | /* ??? Share this with dwarf2cfg.c. */ |
| 250 | #ifndef TC_DWARF2_EMIT_OFFSET |
| 251 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
| 252 | |
| 253 | /* Create an offset to .dwarf2_*. */ |
| 254 | |
| 255 | static void |
| 256 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
| 257 | { |
| 258 | expressionS exp; |
| 259 | |
| 260 | exp.X_op = O_symbol; |
| 261 | exp.X_add_symbol = symbol; |
| 262 | exp.X_add_number = 0; |
| 263 | emit_expr (&exp, size); |
| 264 | } |
| 265 | #endif |
| 266 | |
| 267 | struct cfi_escape_data |
| 268 | { |
| 269 | struct cfi_escape_data *next; |
| 270 | expressionS exp; |
| 271 | }; |
| 272 | |
| 273 | struct cie_entry |
| 274 | { |
| 275 | struct cie_entry *next; |
| 276 | #if SUPPORT_FRAME_LINKONCE |
| 277 | segT cur_seg; |
| 278 | #endif |
| 279 | symbolS *start_address; |
| 280 | unsigned int return_column; |
| 281 | unsigned int signal_frame; |
| 282 | unsigned char per_encoding; |
| 283 | unsigned char lsda_encoding; |
| 284 | expressionS personality; |
| 285 | struct cfi_insn_data *first, *last; |
| 286 | }; |
| 287 | |
| 288 | /* List of FDE entries. */ |
| 289 | |
| 290 | struct fde_entry *all_fde_data; |
| 291 | static struct fde_entry **last_fde_data = &all_fde_data; |
| 292 | |
| 293 | /* List of CIEs so that they could be reused. */ |
| 294 | static struct cie_entry *cie_root; |
| 295 | |
| 296 | /* Stack of old CFI data, for save/restore. */ |
| 297 | struct cfa_save_data |
| 298 | { |
| 299 | struct cfa_save_data *next; |
| 300 | offsetT cfa_offset; |
| 301 | }; |
| 302 | |
| 303 | /* Current open FDE entry. */ |
| 304 | struct frch_cfi_data |
| 305 | { |
| 306 | struct fde_entry *cur_fde_data; |
| 307 | symbolS *last_address; |
| 308 | offsetT cur_cfa_offset; |
| 309 | struct cfa_save_data *cfa_save_stack; |
| 310 | }; |
| 311 | \f |
| 312 | /* Construct a new FDE structure and add it to the end of the fde list. */ |
| 313 | |
| 314 | static struct fde_entry * |
| 315 | alloc_fde_entry (void) |
| 316 | { |
| 317 | struct fde_entry *fde = (struct fde_entry *) |
| 318 | xcalloc (1, sizeof (struct fde_entry)); |
| 319 | |
| 320 | frchain_now->frch_cfi_data = (struct frch_cfi_data *) |
| 321 | xcalloc (1, sizeof (struct frch_cfi_data)); |
| 322 | frchain_now->frch_cfi_data->cur_fde_data = fde; |
| 323 | *last_fde_data = fde; |
| 324 | last_fde_data = &fde->next; |
| 325 | SET_CUR_SEG (fde, is_now_linkonce_segment ()); |
| 326 | SET_HANDLED (fde, 0); |
| 327 | fde->last = &fde->data; |
| 328 | fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; |
| 329 | fde->per_encoding = DW_EH_PE_omit; |
| 330 | fde->lsda_encoding = DW_EH_PE_omit; |
| 331 | |
| 332 | return fde; |
| 333 | } |
| 334 | |
| 335 | /* The following functions are available for a backend to construct its |
| 336 | own unwind information, usually from legacy unwind directives. */ |
| 337 | |
| 338 | /* Construct a new INSN structure and add it to the end of the insn list |
| 339 | for the currently active FDE. */ |
| 340 | |
| 341 | static struct cfi_insn_data * |
| 342 | alloc_cfi_insn_data (void) |
| 343 | { |
| 344 | struct cfi_insn_data *insn = (struct cfi_insn_data *) |
| 345 | xcalloc (1, sizeof (struct cfi_insn_data)); |
| 346 | struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data; |
| 347 | |
| 348 | *cur_fde_data->last = insn; |
| 349 | cur_fde_data->last = &insn->next; |
| 350 | SET_CUR_SEG (insn, is_now_linkonce_segment ()); |
| 351 | return insn; |
| 352 | } |
| 353 | |
| 354 | /* Construct a new FDE structure that begins at LABEL. */ |
| 355 | |
| 356 | void |
| 357 | cfi_new_fde (symbolS *label) |
| 358 | { |
| 359 | struct fde_entry *fde = alloc_fde_entry (); |
| 360 | fde->start_address = label; |
| 361 | frchain_now->frch_cfi_data->last_address = label; |
| 362 | } |
| 363 | |
| 364 | /* End the currently open FDE. */ |
| 365 | |
| 366 | void |
| 367 | cfi_end_fde (symbolS *label) |
| 368 | { |
| 369 | frchain_now->frch_cfi_data->cur_fde_data->end_address = label; |
| 370 | free (frchain_now->frch_cfi_data); |
| 371 | frchain_now->frch_cfi_data = NULL; |
| 372 | } |
| 373 | |
| 374 | /* Set the return column for the current FDE. */ |
| 375 | |
| 376 | void |
| 377 | cfi_set_return_column (unsigned regno) |
| 378 | { |
| 379 | frchain_now->frch_cfi_data->cur_fde_data->return_column = regno; |
| 380 | } |
| 381 | |
| 382 | /* Universal functions to store new instructions. */ |
| 383 | |
| 384 | static void |
| 385 | cfi_add_CFA_insn (int insn) |
| 386 | { |
| 387 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 388 | |
| 389 | insn_ptr->insn = insn; |
| 390 | } |
| 391 | |
| 392 | static void |
| 393 | cfi_add_CFA_insn_reg (int insn, unsigned regno) |
| 394 | { |
| 395 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 396 | |
| 397 | insn_ptr->insn = insn; |
| 398 | insn_ptr->u.r = regno; |
| 399 | } |
| 400 | |
| 401 | static void |
| 402 | cfi_add_CFA_insn_offset (int insn, offsetT offset) |
| 403 | { |
| 404 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 405 | |
| 406 | insn_ptr->insn = insn; |
| 407 | insn_ptr->u.i = offset; |
| 408 | } |
| 409 | |
| 410 | static void |
| 411 | cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) |
| 412 | { |
| 413 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 414 | |
| 415 | insn_ptr->insn = insn; |
| 416 | insn_ptr->u.rr.reg1 = reg1; |
| 417 | insn_ptr->u.rr.reg2 = reg2; |
| 418 | } |
| 419 | |
| 420 | static void |
| 421 | cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) |
| 422 | { |
| 423 | struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| 424 | |
| 425 | insn_ptr->insn = insn; |
| 426 | insn_ptr->u.ri.reg = regno; |
| 427 | insn_ptr->u.ri.offset = offset; |
| 428 | } |
| 429 | |
| 430 | /* Add a CFI insn to advance the PC from the last address to LABEL. */ |
| 431 | |
| 432 | void |
| 433 | cfi_add_advance_loc (symbolS *label) |
| 434 | { |
| 435 | struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
| 436 | |
| 437 | insn->insn = DW_CFA_advance_loc; |
| 438 | insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address; |
| 439 | insn->u.ll.lab2 = label; |
| 440 | |
| 441 | frchain_now->frch_cfi_data->last_address = label; |
| 442 | } |
| 443 | |
| 444 | /* Add a DW_CFA_offset record to the CFI data. */ |
| 445 | |
| 446 | void |
| 447 | cfi_add_CFA_offset (unsigned regno, offsetT offset) |
| 448 | { |
| 449 | unsigned int abs_data_align; |
| 450 | |
| 451 | gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
| 452 | cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); |
| 453 | |
| 454 | abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
| 455 | ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
| 456 | if (offset % abs_data_align) |
| 457 | as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
| 458 | } |
| 459 | |
| 460 | /* Add a DW_CFA_def_cfa record to the CFI data. */ |
| 461 | |
| 462 | void |
| 463 | cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) |
| 464 | { |
| 465 | cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); |
| 466 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| 467 | } |
| 468 | |
| 469 | /* Add a DW_CFA_register record to the CFI data. */ |
| 470 | |
| 471 | void |
| 472 | cfi_add_CFA_register (unsigned reg1, unsigned reg2) |
| 473 | { |
| 474 | cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); |
| 475 | } |
| 476 | |
| 477 | /* Add a DW_CFA_def_cfa_register record to the CFI data. */ |
| 478 | |
| 479 | void |
| 480 | cfi_add_CFA_def_cfa_register (unsigned regno) |
| 481 | { |
| 482 | cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); |
| 483 | } |
| 484 | |
| 485 | /* Add a DW_CFA_def_cfa_offset record to the CFI data. */ |
| 486 | |
| 487 | void |
| 488 | cfi_add_CFA_def_cfa_offset (offsetT offset) |
| 489 | { |
| 490 | cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); |
| 491 | frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| 492 | } |
| 493 | |
| 494 | void |
| 495 | cfi_add_CFA_restore (unsigned regno) |
| 496 | { |
| 497 | cfi_add_CFA_insn_reg (DW_CFA_restore, regno); |
| 498 | } |
| 499 | |
| 500 | void |
| 501 | cfi_add_CFA_undefined (unsigned regno) |
| 502 | { |
| 503 | cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); |
| 504 | } |
| 505 | |
| 506 | void |
| 507 | cfi_add_CFA_same_value (unsigned regno) |
| 508 | { |
| 509 | cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); |
| 510 | } |
| 511 | |
| 512 | void |
| 513 | cfi_add_CFA_remember_state (void) |
| 514 | { |
| 515 | struct cfa_save_data *p; |
| 516 | |
| 517 | cfi_add_CFA_insn (DW_CFA_remember_state); |
| 518 | |
| 519 | p = (struct cfa_save_data *) xmalloc (sizeof (*p)); |
| 520 | p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset; |
| 521 | p->next = frchain_now->frch_cfi_data->cfa_save_stack; |
| 522 | frchain_now->frch_cfi_data->cfa_save_stack = p; |
| 523 | } |
| 524 | |
| 525 | void |
| 526 | cfi_add_CFA_restore_state (void) |
| 527 | { |
| 528 | struct cfa_save_data *p; |
| 529 | |
| 530 | cfi_add_CFA_insn (DW_CFA_restore_state); |
| 531 | |
| 532 | p = frchain_now->frch_cfi_data->cfa_save_stack; |
| 533 | if (p) |
| 534 | { |
| 535 | frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset; |
| 536 | frchain_now->frch_cfi_data->cfa_save_stack = p->next; |
| 537 | free (p); |
| 538 | } |
| 539 | else |
| 540 | as_bad (_("CFI state restore without previous remember")); |
| 541 | } |
| 542 | |
| 543 | \f |
| 544 | /* Parse CFI assembler directives. */ |
| 545 | |
| 546 | static void dot_cfi (int); |
| 547 | static void dot_cfi_escape (int); |
| 548 | static void dot_cfi_sections (int); |
| 549 | static void dot_cfi_startproc (int); |
| 550 | static void dot_cfi_endproc (int); |
| 551 | static void dot_cfi_personality (int); |
| 552 | static void dot_cfi_lsda (int); |
| 553 | static void dot_cfi_val_encoded_addr (int); |
| 554 | |
| 555 | const pseudo_typeS cfi_pseudo_table[] = |
| 556 | { |
| 557 | { "cfi_sections", dot_cfi_sections, 0 }, |
| 558 | { "cfi_startproc", dot_cfi_startproc, 0 }, |
| 559 | { "cfi_endproc", dot_cfi_endproc, 0 }, |
| 560 | { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, |
| 561 | { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, |
| 562 | { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, |
| 563 | { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, |
| 564 | { "cfi_offset", dot_cfi, DW_CFA_offset }, |
| 565 | { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, |
| 566 | { "cfi_register", dot_cfi, DW_CFA_register }, |
| 567 | { "cfi_return_column", dot_cfi, CFI_return_column }, |
| 568 | { "cfi_restore", dot_cfi, DW_CFA_restore }, |
| 569 | { "cfi_undefined", dot_cfi, DW_CFA_undefined }, |
| 570 | { "cfi_same_value", dot_cfi, DW_CFA_same_value }, |
| 571 | { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, |
| 572 | { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, |
| 573 | { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, |
| 574 | { "cfi_escape", dot_cfi_escape, 0 }, |
| 575 | { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, |
| 576 | { "cfi_personality", dot_cfi_personality, 0 }, |
| 577 | { "cfi_lsda", dot_cfi_lsda, 0 }, |
| 578 | { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 }, |
| 579 | { NULL, NULL, 0 } |
| 580 | }; |
| 581 | |
| 582 | static void |
| 583 | cfi_parse_separator (void) |
| 584 | { |
| 585 | SKIP_WHITESPACE (); |
| 586 | if (*input_line_pointer == ',') |
| 587 | input_line_pointer++; |
| 588 | else |
| 589 | as_bad (_("missing separator")); |
| 590 | } |
| 591 | |
| 592 | #ifndef tc_parse_to_dw2regnum |
| 593 | static void |
| 594 | tc_parse_to_dw2regnum (expressionS *exp) |
| 595 | { |
| 596 | # ifdef tc_regname_to_dw2regnum |
| 597 | SKIP_WHITESPACE (); |
| 598 | if (is_name_beginner (*input_line_pointer) |
| 599 | || (*input_line_pointer == '%' |
| 600 | && is_name_beginner (*++input_line_pointer))) |
| 601 | { |
| 602 | char *name, c; |
| 603 | |
| 604 | name = input_line_pointer; |
| 605 | c = get_symbol_end (); |
| 606 | |
| 607 | exp->X_op = O_constant; |
| 608 | exp->X_add_number = tc_regname_to_dw2regnum (name); |
| 609 | |
| 610 | *input_line_pointer = c; |
| 611 | } |
| 612 | else |
| 613 | # endif |
| 614 | expression_and_evaluate (exp); |
| 615 | } |
| 616 | #endif |
| 617 | |
| 618 | static unsigned |
| 619 | cfi_parse_reg (void) |
| 620 | { |
| 621 | int regno; |
| 622 | expressionS exp; |
| 623 | |
| 624 | tc_parse_to_dw2regnum (&exp); |
| 625 | switch (exp.X_op) |
| 626 | { |
| 627 | case O_register: |
| 628 | case O_constant: |
| 629 | regno = exp.X_add_number; |
| 630 | break; |
| 631 | |
| 632 | default: |
| 633 | regno = -1; |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | if (regno < 0) |
| 638 | { |
| 639 | as_bad (_("bad register expression")); |
| 640 | regno = 0; |
| 641 | } |
| 642 | |
| 643 | return regno; |
| 644 | } |
| 645 | |
| 646 | static offsetT |
| 647 | cfi_parse_const (void) |
| 648 | { |
| 649 | return get_absolute_expression (); |
| 650 | } |
| 651 | |
| 652 | static void |
| 653 | dot_cfi (int arg) |
| 654 | { |
| 655 | offsetT offset; |
| 656 | unsigned reg1, reg2; |
| 657 | |
| 658 | if (frchain_now->frch_cfi_data == NULL) |
| 659 | { |
| 660 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 661 | ignore_rest_of_line (); |
| 662 | return; |
| 663 | } |
| 664 | |
| 665 | /* If the last address was not at the current PC, advance to current. */ |
| 666 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 667 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 668 | != frag_now_fix ()) |
| 669 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 670 | |
| 671 | switch (arg) |
| 672 | { |
| 673 | case DW_CFA_offset: |
| 674 | reg1 = cfi_parse_reg (); |
| 675 | cfi_parse_separator (); |
| 676 | offset = cfi_parse_const (); |
| 677 | cfi_add_CFA_offset (reg1, offset); |
| 678 | break; |
| 679 | |
| 680 | case CFI_rel_offset: |
| 681 | reg1 = cfi_parse_reg (); |
| 682 | cfi_parse_separator (); |
| 683 | offset = cfi_parse_const (); |
| 684 | cfi_add_CFA_offset (reg1, |
| 685 | offset - frchain_now->frch_cfi_data->cur_cfa_offset); |
| 686 | break; |
| 687 | |
| 688 | case DW_CFA_def_cfa: |
| 689 | reg1 = cfi_parse_reg (); |
| 690 | cfi_parse_separator (); |
| 691 | offset = cfi_parse_const (); |
| 692 | cfi_add_CFA_def_cfa (reg1, offset); |
| 693 | break; |
| 694 | |
| 695 | case DW_CFA_register: |
| 696 | reg1 = cfi_parse_reg (); |
| 697 | cfi_parse_separator (); |
| 698 | reg2 = cfi_parse_reg (); |
| 699 | cfi_add_CFA_register (reg1, reg2); |
| 700 | break; |
| 701 | |
| 702 | case DW_CFA_def_cfa_register: |
| 703 | reg1 = cfi_parse_reg (); |
| 704 | cfi_add_CFA_def_cfa_register (reg1); |
| 705 | break; |
| 706 | |
| 707 | case DW_CFA_def_cfa_offset: |
| 708 | offset = cfi_parse_const (); |
| 709 | cfi_add_CFA_def_cfa_offset (offset); |
| 710 | break; |
| 711 | |
| 712 | case CFI_adjust_cfa_offset: |
| 713 | offset = cfi_parse_const (); |
| 714 | cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset |
| 715 | + offset); |
| 716 | break; |
| 717 | |
| 718 | case DW_CFA_restore: |
| 719 | for (;;) |
| 720 | { |
| 721 | reg1 = cfi_parse_reg (); |
| 722 | cfi_add_CFA_restore (reg1); |
| 723 | SKIP_WHITESPACE (); |
| 724 | if (*input_line_pointer != ',') |
| 725 | break; |
| 726 | ++input_line_pointer; |
| 727 | } |
| 728 | break; |
| 729 | |
| 730 | case DW_CFA_undefined: |
| 731 | for (;;) |
| 732 | { |
| 733 | reg1 = cfi_parse_reg (); |
| 734 | cfi_add_CFA_undefined (reg1); |
| 735 | SKIP_WHITESPACE (); |
| 736 | if (*input_line_pointer != ',') |
| 737 | break; |
| 738 | ++input_line_pointer; |
| 739 | } |
| 740 | break; |
| 741 | |
| 742 | case DW_CFA_same_value: |
| 743 | reg1 = cfi_parse_reg (); |
| 744 | cfi_add_CFA_same_value (reg1); |
| 745 | break; |
| 746 | |
| 747 | case CFI_return_column: |
| 748 | reg1 = cfi_parse_reg (); |
| 749 | cfi_set_return_column (reg1); |
| 750 | break; |
| 751 | |
| 752 | case DW_CFA_remember_state: |
| 753 | cfi_add_CFA_remember_state (); |
| 754 | break; |
| 755 | |
| 756 | case DW_CFA_restore_state: |
| 757 | cfi_add_CFA_restore_state (); |
| 758 | break; |
| 759 | |
| 760 | case DW_CFA_GNU_window_save: |
| 761 | cfi_add_CFA_insn (DW_CFA_GNU_window_save); |
| 762 | break; |
| 763 | |
| 764 | case CFI_signal_frame: |
| 765 | frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1; |
| 766 | break; |
| 767 | |
| 768 | default: |
| 769 | abort (); |
| 770 | } |
| 771 | |
| 772 | demand_empty_rest_of_line (); |
| 773 | } |
| 774 | |
| 775 | static void |
| 776 | dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) |
| 777 | { |
| 778 | struct cfi_escape_data *head, **tail, *e; |
| 779 | struct cfi_insn_data *insn; |
| 780 | |
| 781 | if (frchain_now->frch_cfi_data == NULL) |
| 782 | { |
| 783 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 784 | ignore_rest_of_line (); |
| 785 | return; |
| 786 | } |
| 787 | |
| 788 | /* If the last address was not at the current PC, advance to current. */ |
| 789 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 790 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 791 | != frag_now_fix ()) |
| 792 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 793 | |
| 794 | tail = &head; |
| 795 | do |
| 796 | { |
| 797 | e = (struct cfi_escape_data *) xmalloc (sizeof (*e)); |
| 798 | do_parse_cons_expression (&e->exp, 1); |
| 799 | *tail = e; |
| 800 | tail = &e->next; |
| 801 | } |
| 802 | while (*input_line_pointer++ == ','); |
| 803 | *tail = NULL; |
| 804 | |
| 805 | insn = alloc_cfi_insn_data (); |
| 806 | insn->insn = CFI_escape; |
| 807 | insn->u.esc = head; |
| 808 | |
| 809 | --input_line_pointer; |
| 810 | demand_empty_rest_of_line (); |
| 811 | } |
| 812 | |
| 813 | static void |
| 814 | dot_cfi_personality (int ignored ATTRIBUTE_UNUSED) |
| 815 | { |
| 816 | struct fde_entry *fde; |
| 817 | offsetT encoding; |
| 818 | |
| 819 | if (frchain_now->frch_cfi_data == NULL) |
| 820 | { |
| 821 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 822 | ignore_rest_of_line (); |
| 823 | return; |
| 824 | } |
| 825 | |
| 826 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
| 827 | encoding = cfi_parse_const (); |
| 828 | if (encoding == DW_EH_PE_omit) |
| 829 | { |
| 830 | demand_empty_rest_of_line (); |
| 831 | fde->per_encoding = encoding; |
| 832 | return; |
| 833 | } |
| 834 | |
| 835 | if ((encoding & 0xff) != encoding |
| 836 | || ((encoding & 0x70) != 0 |
| 837 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 838 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 839 | #endif |
| 840 | ) |
| 841 | /* leb128 can be handled, but does something actually need it? */ |
| 842 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 843 | || (encoding & 7) > DW_EH_PE_udata8) |
| 844 | { |
| 845 | as_bad (_("invalid or unsupported encoding in .cfi_personality")); |
| 846 | ignore_rest_of_line (); |
| 847 | return; |
| 848 | } |
| 849 | |
| 850 | if (*input_line_pointer++ != ',') |
| 851 | { |
| 852 | as_bad (_(".cfi_personality requires encoding and symbol arguments")); |
| 853 | ignore_rest_of_line (); |
| 854 | return; |
| 855 | } |
| 856 | |
| 857 | expression_and_evaluate (&fde->personality); |
| 858 | switch (fde->personality.X_op) |
| 859 | { |
| 860 | case O_symbol: |
| 861 | break; |
| 862 | case O_constant: |
| 863 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 864 | encoding = DW_EH_PE_omit; |
| 865 | break; |
| 866 | default: |
| 867 | encoding = DW_EH_PE_omit; |
| 868 | break; |
| 869 | } |
| 870 | |
| 871 | fde->per_encoding = encoding; |
| 872 | |
| 873 | if (encoding == DW_EH_PE_omit) |
| 874 | { |
| 875 | as_bad (_("wrong second argument to .cfi_personality")); |
| 876 | ignore_rest_of_line (); |
| 877 | return; |
| 878 | } |
| 879 | |
| 880 | demand_empty_rest_of_line (); |
| 881 | } |
| 882 | |
| 883 | static void |
| 884 | dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED) |
| 885 | { |
| 886 | struct fde_entry *fde; |
| 887 | offsetT encoding; |
| 888 | |
| 889 | if (frchain_now->frch_cfi_data == NULL) |
| 890 | { |
| 891 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 892 | ignore_rest_of_line (); |
| 893 | return; |
| 894 | } |
| 895 | |
| 896 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
| 897 | encoding = cfi_parse_const (); |
| 898 | if (encoding == DW_EH_PE_omit) |
| 899 | { |
| 900 | demand_empty_rest_of_line (); |
| 901 | fde->lsda_encoding = encoding; |
| 902 | return; |
| 903 | } |
| 904 | |
| 905 | if ((encoding & 0xff) != encoding |
| 906 | || ((encoding & 0x70) != 0 |
| 907 | #if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr |
| 908 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 909 | #endif |
| 910 | ) |
| 911 | /* leb128 can be handled, but does something actually need it? */ |
| 912 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 913 | || (encoding & 7) > DW_EH_PE_udata8) |
| 914 | { |
| 915 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| 916 | ignore_rest_of_line (); |
| 917 | return; |
| 918 | } |
| 919 | |
| 920 | if (*input_line_pointer++ != ',') |
| 921 | { |
| 922 | as_bad (_(".cfi_lsda requires encoding and symbol arguments")); |
| 923 | ignore_rest_of_line (); |
| 924 | return; |
| 925 | } |
| 926 | |
| 927 | fde->lsda_encoding = encoding; |
| 928 | |
| 929 | expression_and_evaluate (&fde->lsda); |
| 930 | switch (fde->lsda.X_op) |
| 931 | { |
| 932 | case O_symbol: |
| 933 | break; |
| 934 | case O_constant: |
| 935 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 936 | encoding = DW_EH_PE_omit; |
| 937 | break; |
| 938 | default: |
| 939 | encoding = DW_EH_PE_omit; |
| 940 | break; |
| 941 | } |
| 942 | |
| 943 | fde->lsda_encoding = encoding; |
| 944 | |
| 945 | if (encoding == DW_EH_PE_omit) |
| 946 | { |
| 947 | as_bad (_("wrong second argument to .cfi_lsda")); |
| 948 | ignore_rest_of_line (); |
| 949 | return; |
| 950 | } |
| 951 | |
| 952 | demand_empty_rest_of_line (); |
| 953 | } |
| 954 | |
| 955 | static void |
| 956 | dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED) |
| 957 | { |
| 958 | struct cfi_insn_data *insn_ptr; |
| 959 | offsetT encoding; |
| 960 | |
| 961 | if (frchain_now->frch_cfi_data == NULL) |
| 962 | { |
| 963 | as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| 964 | ignore_rest_of_line (); |
| 965 | return; |
| 966 | } |
| 967 | |
| 968 | /* If the last address was not at the current PC, advance to current. */ |
| 969 | if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| 970 | || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| 971 | != frag_now_fix ()) |
| 972 | cfi_add_advance_loc (symbol_temp_new_now ()); |
| 973 | |
| 974 | insn_ptr = alloc_cfi_insn_data (); |
| 975 | insn_ptr->insn = CFI_val_encoded_addr; |
| 976 | |
| 977 | insn_ptr->u.ea.reg = cfi_parse_reg (); |
| 978 | |
| 979 | cfi_parse_separator (); |
| 980 | encoding = cfi_parse_const (); |
| 981 | if ((encoding & 0xff) != encoding |
| 982 | || ((encoding & 0x70) != 0 |
| 983 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 984 | && (encoding & 0x70) != DW_EH_PE_pcrel |
| 985 | #endif |
| 986 | ) |
| 987 | /* leb128 can be handled, but does something actually need it? */ |
| 988 | || (encoding & 7) == DW_EH_PE_uleb128 |
| 989 | || (encoding & 7) > DW_EH_PE_udata8) |
| 990 | { |
| 991 | as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| 992 | encoding = DW_EH_PE_omit; |
| 993 | } |
| 994 | |
| 995 | cfi_parse_separator (); |
| 996 | expression_and_evaluate (&insn_ptr->u.ea.exp); |
| 997 | switch (insn_ptr->u.ea.exp.X_op) |
| 998 | { |
| 999 | case O_symbol: |
| 1000 | break; |
| 1001 | case O_constant: |
| 1002 | if ((encoding & 0x70) != DW_EH_PE_pcrel) |
| 1003 | break; |
| 1004 | default: |
| 1005 | encoding = DW_EH_PE_omit; |
| 1006 | break; |
| 1007 | } |
| 1008 | |
| 1009 | insn_ptr->u.ea.encoding = encoding; |
| 1010 | if (encoding == DW_EH_PE_omit) |
| 1011 | { |
| 1012 | as_bad (_("wrong third argument to .cfi_val_encoded_addr")); |
| 1013 | ignore_rest_of_line (); |
| 1014 | return; |
| 1015 | } |
| 1016 | |
| 1017 | demand_empty_rest_of_line (); |
| 1018 | } |
| 1019 | |
| 1020 | /* By default emit .eh_frame only, not .debug_frame. */ |
| 1021 | #define CFI_EMIT_eh_frame (1 << 0) |
| 1022 | #define CFI_EMIT_debug_frame (1 << 1) |
| 1023 | #define CFI_EMIT_target (1 << 2) |
| 1024 | static int cfi_sections = CFI_EMIT_eh_frame; |
| 1025 | |
| 1026 | static void |
| 1027 | dot_cfi_sections (int ignored ATTRIBUTE_UNUSED) |
| 1028 | { |
| 1029 | int sections = 0; |
| 1030 | |
| 1031 | SKIP_WHITESPACE (); |
| 1032 | if (is_name_beginner (*input_line_pointer)) |
| 1033 | while (1) |
| 1034 | { |
| 1035 | char *name, c; |
| 1036 | |
| 1037 | name = input_line_pointer; |
| 1038 | c = get_symbol_end (); |
| 1039 | |
| 1040 | if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0 |
| 1041 | && name[9] != '_') |
| 1042 | sections |= CFI_EMIT_eh_frame; |
| 1043 | else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0) |
| 1044 | sections |= CFI_EMIT_debug_frame; |
| 1045 | #ifdef tc_cfi_section_name |
| 1046 | else if (strcmp (name, tc_cfi_section_name) == 0) |
| 1047 | sections |= CFI_EMIT_target; |
| 1048 | #endif |
| 1049 | else |
| 1050 | { |
| 1051 | *input_line_pointer = c; |
| 1052 | input_line_pointer = name; |
| 1053 | break; |
| 1054 | } |
| 1055 | |
| 1056 | *input_line_pointer = c; |
| 1057 | SKIP_WHITESPACE (); |
| 1058 | if (*input_line_pointer == ',') |
| 1059 | { |
| 1060 | name = input_line_pointer++; |
| 1061 | SKIP_WHITESPACE (); |
| 1062 | if (!is_name_beginner (*input_line_pointer)) |
| 1063 | { |
| 1064 | input_line_pointer = name; |
| 1065 | break; |
| 1066 | } |
| 1067 | } |
| 1068 | else if (is_name_beginner (*input_line_pointer)) |
| 1069 | break; |
| 1070 | } |
| 1071 | |
| 1072 | demand_empty_rest_of_line (); |
| 1073 | cfi_sections = sections; |
| 1074 | } |
| 1075 | |
| 1076 | static void |
| 1077 | dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) |
| 1078 | { |
| 1079 | int simple = 0; |
| 1080 | |
| 1081 | if (frchain_now->frch_cfi_data != NULL) |
| 1082 | { |
| 1083 | as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); |
| 1084 | ignore_rest_of_line (); |
| 1085 | return; |
| 1086 | } |
| 1087 | |
| 1088 | cfi_new_fde (symbol_temp_new_now ()); |
| 1089 | |
| 1090 | SKIP_WHITESPACE (); |
| 1091 | if (is_name_beginner (*input_line_pointer)) |
| 1092 | { |
| 1093 | char *name, c; |
| 1094 | |
| 1095 | name = input_line_pointer; |
| 1096 | c = get_symbol_end (); |
| 1097 | |
| 1098 | if (strcmp (name, "simple") == 0) |
| 1099 | { |
| 1100 | simple = 1; |
| 1101 | *input_line_pointer = c; |
| 1102 | } |
| 1103 | else |
| 1104 | input_line_pointer = name; |
| 1105 | } |
| 1106 | demand_empty_rest_of_line (); |
| 1107 | |
| 1108 | frchain_now->frch_cfi_data->cur_cfa_offset = 0; |
| 1109 | if (!simple) |
| 1110 | tc_cfi_frame_initial_instructions (); |
| 1111 | |
| 1112 | if ((cfi_sections & CFI_EMIT_target) != 0) |
| 1113 | tc_cfi_startproc (); |
| 1114 | } |
| 1115 | |
| 1116 | static void |
| 1117 | dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) |
| 1118 | { |
| 1119 | struct fde_entry *fde; |
| 1120 | |
| 1121 | if (frchain_now->frch_cfi_data == NULL) |
| 1122 | { |
| 1123 | as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); |
| 1124 | ignore_rest_of_line (); |
| 1125 | return; |
| 1126 | } |
| 1127 | |
| 1128 | fde = frchain_now->frch_cfi_data->cur_fde_data; |
| 1129 | |
| 1130 | cfi_end_fde (symbol_temp_new_now ()); |
| 1131 | |
| 1132 | demand_empty_rest_of_line (); |
| 1133 | |
| 1134 | if ((cfi_sections & CFI_EMIT_target) != 0) |
| 1135 | tc_cfi_endproc (fde); |
| 1136 | } |
| 1137 | |
| 1138 | \f |
| 1139 | /* Emit a single byte into the current segment. */ |
| 1140 | |
| 1141 | static inline void |
| 1142 | out_one (int byte) |
| 1143 | { |
| 1144 | FRAG_APPEND_1_CHAR (byte); |
| 1145 | } |
| 1146 | |
| 1147 | /* Emit a two-byte word into the current segment. */ |
| 1148 | |
| 1149 | static inline void |
| 1150 | out_two (int data) |
| 1151 | { |
| 1152 | md_number_to_chars (frag_more (2), data, 2); |
| 1153 | } |
| 1154 | |
| 1155 | /* Emit a four byte word into the current segment. */ |
| 1156 | |
| 1157 | static inline void |
| 1158 | out_four (int data) |
| 1159 | { |
| 1160 | md_number_to_chars (frag_more (4), data, 4); |
| 1161 | } |
| 1162 | |
| 1163 | /* Emit an unsigned "little-endian base 128" number. */ |
| 1164 | |
| 1165 | static void |
| 1166 | out_uleb128 (addressT value) |
| 1167 | { |
| 1168 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
| 1169 | } |
| 1170 | |
| 1171 | /* Emit an unsigned "little-endian base 128" number. */ |
| 1172 | |
| 1173 | static void |
| 1174 | out_sleb128 (offsetT value) |
| 1175 | { |
| 1176 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
| 1177 | } |
| 1178 | |
| 1179 | static void |
| 1180 | output_cfi_insn (struct cfi_insn_data *insn) |
| 1181 | { |
| 1182 | offsetT offset; |
| 1183 | unsigned int regno; |
| 1184 | |
| 1185 | switch (insn->insn) |
| 1186 | { |
| 1187 | case DW_CFA_advance_loc: |
| 1188 | { |
| 1189 | symbolS *from = insn->u.ll.lab1; |
| 1190 | symbolS *to = insn->u.ll.lab2; |
| 1191 | |
| 1192 | if (symbol_get_frag (to) == symbol_get_frag (from)) |
| 1193 | { |
| 1194 | addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); |
| 1195 | addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; |
| 1196 | |
| 1197 | if (scaled <= 0x3F) |
| 1198 | out_one (DW_CFA_advance_loc + scaled); |
| 1199 | else if (scaled <= 0xFF) |
| 1200 | { |
| 1201 | out_one (DW_CFA_advance_loc1); |
| 1202 | out_one (scaled); |
| 1203 | } |
| 1204 | else if (scaled <= 0xFFFF) |
| 1205 | { |
| 1206 | out_one (DW_CFA_advance_loc2); |
| 1207 | out_two (scaled); |
| 1208 | } |
| 1209 | else |
| 1210 | { |
| 1211 | out_one (DW_CFA_advance_loc4); |
| 1212 | out_four (scaled); |
| 1213 | } |
| 1214 | } |
| 1215 | else |
| 1216 | { |
| 1217 | expressionS exp; |
| 1218 | |
| 1219 | exp.X_op = O_subtract; |
| 1220 | exp.X_add_symbol = to; |
| 1221 | exp.X_op_symbol = from; |
| 1222 | exp.X_add_number = 0; |
| 1223 | |
| 1224 | /* The code in ehopt.c expects that one byte of the encoding |
| 1225 | is already allocated to the frag. This comes from the way |
| 1226 | that it scans the .eh_frame section looking first for the |
| 1227 | .byte DW_CFA_advance_loc4. */ |
| 1228 | *frag_more (1) = DW_CFA_advance_loc4; |
| 1229 | |
| 1230 | frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, |
| 1231 | make_expr_symbol (&exp), frag_now_fix () - 1, |
| 1232 | (char *) frag_now); |
| 1233 | } |
| 1234 | } |
| 1235 | break; |
| 1236 | |
| 1237 | case DW_CFA_def_cfa: |
| 1238 | offset = insn->u.ri.offset; |
| 1239 | if (offset < 0) |
| 1240 | { |
| 1241 | out_one (DW_CFA_def_cfa_sf); |
| 1242 | out_uleb128 (insn->u.ri.reg); |
| 1243 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| 1244 | } |
| 1245 | else |
| 1246 | { |
| 1247 | out_one (DW_CFA_def_cfa); |
| 1248 | out_uleb128 (insn->u.ri.reg); |
| 1249 | out_uleb128 (offset); |
| 1250 | } |
| 1251 | break; |
| 1252 | |
| 1253 | case DW_CFA_def_cfa_register: |
| 1254 | case DW_CFA_undefined: |
| 1255 | case DW_CFA_same_value: |
| 1256 | out_one (insn->insn); |
| 1257 | out_uleb128 (insn->u.r); |
| 1258 | break; |
| 1259 | |
| 1260 | case DW_CFA_def_cfa_offset: |
| 1261 | offset = insn->u.i; |
| 1262 | if (offset < 0) |
| 1263 | { |
| 1264 | out_one (DW_CFA_def_cfa_offset_sf); |
| 1265 | out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| 1266 | } |
| 1267 | else |
| 1268 | { |
| 1269 | out_one (DW_CFA_def_cfa_offset); |
| 1270 | out_uleb128 (offset); |
| 1271 | } |
| 1272 | break; |
| 1273 | |
| 1274 | case DW_CFA_restore: |
| 1275 | regno = insn->u.r; |
| 1276 | if (regno <= 0x3F) |
| 1277 | { |
| 1278 | out_one (DW_CFA_restore + regno); |
| 1279 | } |
| 1280 | else |
| 1281 | { |
| 1282 | out_one (DW_CFA_restore_extended); |
| 1283 | out_uleb128 (regno); |
| 1284 | } |
| 1285 | break; |
| 1286 | |
| 1287 | case DW_CFA_offset: |
| 1288 | regno = insn->u.ri.reg; |
| 1289 | offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
| 1290 | if (offset < 0) |
| 1291 | { |
| 1292 | out_one (DW_CFA_offset_extended_sf); |
| 1293 | out_uleb128 (regno); |
| 1294 | out_sleb128 (offset); |
| 1295 | } |
| 1296 | else if (regno <= 0x3F) |
| 1297 | { |
| 1298 | out_one (DW_CFA_offset + regno); |
| 1299 | out_uleb128 (offset); |
| 1300 | } |
| 1301 | else |
| 1302 | { |
| 1303 | out_one (DW_CFA_offset_extended); |
| 1304 | out_uleb128 (regno); |
| 1305 | out_uleb128 (offset); |
| 1306 | } |
| 1307 | break; |
| 1308 | |
| 1309 | case DW_CFA_register: |
| 1310 | out_one (DW_CFA_register); |
| 1311 | out_uleb128 (insn->u.rr.reg1); |
| 1312 | out_uleb128 (insn->u.rr.reg2); |
| 1313 | break; |
| 1314 | |
| 1315 | case DW_CFA_remember_state: |
| 1316 | case DW_CFA_restore_state: |
| 1317 | out_one (insn->insn); |
| 1318 | break; |
| 1319 | |
| 1320 | case DW_CFA_GNU_window_save: |
| 1321 | out_one (DW_CFA_GNU_window_save); |
| 1322 | break; |
| 1323 | |
| 1324 | case CFI_escape: |
| 1325 | { |
| 1326 | struct cfi_escape_data *e; |
| 1327 | for (e = insn->u.esc; e ; e = e->next) |
| 1328 | emit_expr (&e->exp, 1); |
| 1329 | break; |
| 1330 | } |
| 1331 | |
| 1332 | case CFI_val_encoded_addr: |
| 1333 | { |
| 1334 | unsigned encoding = insn->u.ea.encoding; |
| 1335 | offsetT encoding_size; |
| 1336 | |
| 1337 | if (encoding == DW_EH_PE_omit) |
| 1338 | break; |
| 1339 | out_one (DW_CFA_val_expression); |
| 1340 | out_uleb128 (insn->u.ea.reg); |
| 1341 | |
| 1342 | switch (encoding & 0x7) |
| 1343 | { |
| 1344 | case DW_EH_PE_absptr: |
| 1345 | encoding_size = DWARF2_ADDR_SIZE (stdoutput); |
| 1346 | break; |
| 1347 | case DW_EH_PE_udata2: |
| 1348 | encoding_size = 2; |
| 1349 | break; |
| 1350 | case DW_EH_PE_udata4: |
| 1351 | encoding_size = 4; |
| 1352 | break; |
| 1353 | case DW_EH_PE_udata8: |
| 1354 | encoding_size = 8; |
| 1355 | break; |
| 1356 | default: |
| 1357 | abort (); |
| 1358 | } |
| 1359 | |
| 1360 | /* If the user has requested absolute encoding, |
| 1361 | then use the smaller DW_OP_addr encoding. */ |
| 1362 | if (insn->u.ea.encoding == DW_EH_PE_absptr) |
| 1363 | { |
| 1364 | out_uleb128 (1 + encoding_size); |
| 1365 | out_one (DW_OP_addr); |
| 1366 | } |
| 1367 | else |
| 1368 | { |
| 1369 | out_uleb128 (1 + 1 + encoding_size); |
| 1370 | out_one (DW_OP_GNU_encoded_addr); |
| 1371 | out_one (encoding); |
| 1372 | |
| 1373 | if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| 1374 | { |
| 1375 | #if CFI_DIFF_EXPR_OK |
| 1376 | insn->u.ea.exp.X_op = O_subtract; |
| 1377 | insn->u.ea.exp.X_op_symbol = symbol_temp_new_now (); |
| 1378 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1379 | tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, encoding_size); |
| 1380 | break; |
| 1381 | #else |
| 1382 | abort (); |
| 1383 | #endif |
| 1384 | } |
| 1385 | } |
| 1386 | emit_expr (&insn->u.ea.exp, encoding_size); |
| 1387 | } |
| 1388 | break; |
| 1389 | |
| 1390 | default: |
| 1391 | abort (); |
| 1392 | } |
| 1393 | } |
| 1394 | |
| 1395 | static offsetT |
| 1396 | encoding_size (unsigned char encoding) |
| 1397 | { |
| 1398 | if (encoding == DW_EH_PE_omit) |
| 1399 | return 0; |
| 1400 | switch (encoding & 0x7) |
| 1401 | { |
| 1402 | case 0: |
| 1403 | return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4; |
| 1404 | case DW_EH_PE_udata2: |
| 1405 | return 2; |
| 1406 | case DW_EH_PE_udata4: |
| 1407 | return 4; |
| 1408 | case DW_EH_PE_udata8: |
| 1409 | return 8; |
| 1410 | default: |
| 1411 | abort (); |
| 1412 | } |
| 1413 | } |
| 1414 | |
| 1415 | static void |
| 1416 | output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align) |
| 1417 | { |
| 1418 | symbolS *after_size_address, *end_address; |
| 1419 | expressionS exp; |
| 1420 | struct cfi_insn_data *i; |
| 1421 | offsetT augmentation_size; |
| 1422 | int enc; |
| 1423 | enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
| 1424 | |
| 1425 | cie->start_address = symbol_temp_new_now (); |
| 1426 | after_size_address = symbol_temp_make (); |
| 1427 | end_address = symbol_temp_make (); |
| 1428 | |
| 1429 | exp.X_op = O_subtract; |
| 1430 | exp.X_add_symbol = end_address; |
| 1431 | exp.X_op_symbol = after_size_address; |
| 1432 | exp.X_add_number = 0; |
| 1433 | |
| 1434 | if (eh_frame || fmt == dwarf2_format_32bit) |
| 1435 | emit_expr (&exp, 4); /* Length. */ |
| 1436 | else |
| 1437 | { |
| 1438 | if (fmt == dwarf2_format_64bit) |
| 1439 | out_four (-1); |
| 1440 | emit_expr (&exp, 8); /* Length. */ |
| 1441 | } |
| 1442 | symbol_set_value_now (after_size_address); |
| 1443 | if (eh_frame) |
| 1444 | out_four (0); /* CIE id. */ |
| 1445 | else |
| 1446 | { |
| 1447 | out_four (-1); /* CIE id. */ |
| 1448 | if (fmt != dwarf2_format_32bit) |
| 1449 | out_four (-1); |
| 1450 | } |
| 1451 | out_one (DW_CIE_VERSION); /* Version. */ |
| 1452 | if (eh_frame) |
| 1453 | { |
| 1454 | out_one ('z'); /* Augmentation. */ |
| 1455 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1456 | out_one ('P'); |
| 1457 | if (cie->lsda_encoding != DW_EH_PE_omit) |
| 1458 | out_one ('L'); |
| 1459 | out_one ('R'); |
| 1460 | } |
| 1461 | if (cie->signal_frame) |
| 1462 | out_one ('S'); |
| 1463 | out_one (0); |
| 1464 | out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ |
| 1465 | out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ |
| 1466 | if (DW_CIE_VERSION == 1) /* Return column. */ |
| 1467 | out_one (cie->return_column); |
| 1468 | else |
| 1469 | out_uleb128 (cie->return_column); |
| 1470 | if (eh_frame) |
| 1471 | { |
| 1472 | augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit); |
| 1473 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1474 | augmentation_size += 1 + encoding_size (cie->per_encoding); |
| 1475 | out_uleb128 (augmentation_size); /* Augmentation size. */ |
| 1476 | |
| 1477 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1478 | { |
| 1479 | offsetT size = encoding_size (cie->per_encoding); |
| 1480 | out_one (cie->per_encoding); |
| 1481 | exp = cie->personality; |
| 1482 | if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel) |
| 1483 | { |
| 1484 | #if CFI_DIFF_EXPR_OK |
| 1485 | exp.X_op = O_subtract; |
| 1486 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1487 | emit_expr (&exp, size); |
| 1488 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1489 | tc_cfi_emit_pcrel_expr (&exp, size); |
| 1490 | #else |
| 1491 | abort (); |
| 1492 | #endif |
| 1493 | } |
| 1494 | else |
| 1495 | emit_expr (&exp, size); |
| 1496 | } |
| 1497 | |
| 1498 | if (cie->lsda_encoding != DW_EH_PE_omit) |
| 1499 | out_one (cie->lsda_encoding); |
| 1500 | } |
| 1501 | |
| 1502 | switch (DWARF2_FDE_RELOC_SIZE) |
| 1503 | { |
| 1504 | case 2: |
| 1505 | enc = DW_EH_PE_sdata2; |
| 1506 | break; |
| 1507 | case 4: |
| 1508 | enc = DW_EH_PE_sdata4; |
| 1509 | break; |
| 1510 | case 8: |
| 1511 | enc = DW_EH_PE_sdata8; |
| 1512 | break; |
| 1513 | default: |
| 1514 | abort (); |
| 1515 | } |
| 1516 | #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| 1517 | enc |= DW_EH_PE_pcrel; |
| 1518 | #endif |
| 1519 | if (eh_frame) |
| 1520 | out_one (enc); |
| 1521 | |
| 1522 | if (cie->first) |
| 1523 | { |
| 1524 | for (i = cie->first; i != cie->last; i = i->next) |
| 1525 | { |
| 1526 | if (CUR_SEG (i) != CUR_SEG (cie)) |
| 1527 | continue; |
| 1528 | output_cfi_insn (i); |
| 1529 | } |
| 1530 | } |
| 1531 | |
| 1532 | frag_align (align, DW_CFA_nop, 0); |
| 1533 | symbol_set_value_now (end_address); |
| 1534 | } |
| 1535 | |
| 1536 | static void |
| 1537 | output_fde (struct fde_entry *fde, struct cie_entry *cie, |
| 1538 | bfd_boolean eh_frame, struct cfi_insn_data *first, |
| 1539 | int align) |
| 1540 | { |
| 1541 | symbolS *after_size_address, *end_address; |
| 1542 | expressionS exp; |
| 1543 | offsetT augmentation_size; |
| 1544 | enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
| 1545 | int offset_size; |
| 1546 | int addr_size; |
| 1547 | |
| 1548 | after_size_address = symbol_temp_make (); |
| 1549 | end_address = symbol_temp_make (); |
| 1550 | |
| 1551 | exp.X_op = O_subtract; |
| 1552 | exp.X_add_symbol = end_address; |
| 1553 | exp.X_op_symbol = after_size_address; |
| 1554 | exp.X_add_number = 0; |
| 1555 | if (eh_frame || fmt == dwarf2_format_32bit) |
| 1556 | offset_size = 4; |
| 1557 | else |
| 1558 | { |
| 1559 | if (fmt == dwarf2_format_64bit) |
| 1560 | out_four (-1); |
| 1561 | offset_size = 8; |
| 1562 | } |
| 1563 | emit_expr (&exp, offset_size); /* Length. */ |
| 1564 | symbol_set_value_now (after_size_address); |
| 1565 | |
| 1566 | if (eh_frame) |
| 1567 | { |
| 1568 | exp.X_op = O_subtract; |
| 1569 | exp.X_add_symbol = after_size_address; |
| 1570 | exp.X_op_symbol = cie->start_address; |
| 1571 | exp.X_add_number = 0; |
| 1572 | emit_expr (&exp, offset_size); /* CIE offset. */ |
| 1573 | } |
| 1574 | else |
| 1575 | { |
| 1576 | TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size); |
| 1577 | } |
| 1578 | |
| 1579 | if (eh_frame) |
| 1580 | { |
| 1581 | exp.X_op = O_subtract; |
| 1582 | exp.X_add_number = 0; |
| 1583 | #if CFI_DIFF_EXPR_OK |
| 1584 | exp.X_add_symbol = fde->start_address; |
| 1585 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1586 | emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1587 | #else |
| 1588 | exp.X_op = O_symbol; |
| 1589 | exp.X_add_symbol = fde->start_address; |
| 1590 | #ifdef tc_cfi_emit_pcrel_expr |
| 1591 | tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1592 | #else |
| 1593 | emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ |
| 1594 | #endif |
| 1595 | #endif |
| 1596 | addr_size = DWARF2_FDE_RELOC_SIZE; |
| 1597 | } |
| 1598 | else |
| 1599 | { |
| 1600 | exp.X_op = O_symbol; |
| 1601 | exp.X_add_symbol = fde->start_address; |
| 1602 | exp.X_add_number = 0; |
| 1603 | addr_size = DWARF2_ADDR_SIZE (stdoutput); |
| 1604 | emit_expr (&exp, addr_size); |
| 1605 | } |
| 1606 | |
| 1607 | exp.X_op = O_subtract; |
| 1608 | exp.X_add_symbol = fde->end_address; |
| 1609 | exp.X_op_symbol = fde->start_address; /* Code length. */ |
| 1610 | exp.X_add_number = 0; |
| 1611 | emit_expr (&exp, addr_size); |
| 1612 | |
| 1613 | augmentation_size = encoding_size (fde->lsda_encoding); |
| 1614 | if (eh_frame) |
| 1615 | out_uleb128 (augmentation_size); /* Augmentation size. */ |
| 1616 | |
| 1617 | if (fde->lsda_encoding != DW_EH_PE_omit) |
| 1618 | { |
| 1619 | exp = fde->lsda; |
| 1620 | if ((fde->lsda_encoding & 0x70) == DW_EH_PE_pcrel) |
| 1621 | { |
| 1622 | #if CFI_DIFF_LSDA_OK |
| 1623 | exp.X_op = O_subtract; |
| 1624 | exp.X_op_symbol = symbol_temp_new_now (); |
| 1625 | emit_expr (&exp, augmentation_size); |
| 1626 | #elif defined (tc_cfi_emit_pcrel_expr) |
| 1627 | tc_cfi_emit_pcrel_expr (&exp, augmentation_size); |
| 1628 | #else |
| 1629 | abort (); |
| 1630 | #endif |
| 1631 | } |
| 1632 | else |
| 1633 | emit_expr (&exp, augmentation_size); |
| 1634 | } |
| 1635 | |
| 1636 | for (; first; first = first->next) |
| 1637 | if (CUR_SEG (first) == CUR_SEG (fde)) |
| 1638 | output_cfi_insn (first); |
| 1639 | |
| 1640 | frag_align (align, DW_CFA_nop, 0); |
| 1641 | symbol_set_value_now (end_address); |
| 1642 | } |
| 1643 | |
| 1644 | static struct cie_entry * |
| 1645 | select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame, |
| 1646 | struct cfi_insn_data **pfirst, int align) |
| 1647 | { |
| 1648 | struct cfi_insn_data *i, *j; |
| 1649 | struct cie_entry *cie; |
| 1650 | |
| 1651 | for (cie = cie_root; cie; cie = cie->next) |
| 1652 | { |
| 1653 | if (CUR_SEG (cie) != CUR_SEG (fde)) |
| 1654 | continue; |
| 1655 | if (cie->return_column != fde->return_column |
| 1656 | || cie->signal_frame != fde->signal_frame |
| 1657 | || cie->per_encoding != fde->per_encoding |
| 1658 | || cie->lsda_encoding != fde->lsda_encoding) |
| 1659 | continue; |
| 1660 | if (cie->per_encoding != DW_EH_PE_omit) |
| 1661 | { |
| 1662 | if (cie->personality.X_op != fde->personality.X_op |
| 1663 | || cie->personality.X_add_number |
| 1664 | != fde->personality.X_add_number) |
| 1665 | continue; |
| 1666 | switch (cie->personality.X_op) |
| 1667 | { |
| 1668 | case O_constant: |
| 1669 | if (cie->personality.X_unsigned != fde->personality.X_unsigned) |
| 1670 | continue; |
| 1671 | break; |
| 1672 | case O_symbol: |
| 1673 | if (cie->personality.X_add_symbol |
| 1674 | != fde->personality.X_add_symbol) |
| 1675 | continue; |
| 1676 | break; |
| 1677 | default: |
| 1678 | abort (); |
| 1679 | } |
| 1680 | } |
| 1681 | for (i = cie->first, j = fde->data; |
| 1682 | i != cie->last && j != NULL; |
| 1683 | i = i->next, j = j->next) |
| 1684 | { |
| 1685 | if (i->insn != j->insn) |
| 1686 | goto fail; |
| 1687 | switch (i->insn) |
| 1688 | { |
| 1689 | case DW_CFA_advance_loc: |
| 1690 | case DW_CFA_remember_state: |
| 1691 | /* We reached the first advance/remember in the FDE, |
| 1692 | but did not reach the end of the CIE list. */ |
| 1693 | goto fail; |
| 1694 | |
| 1695 | case DW_CFA_offset: |
| 1696 | case DW_CFA_def_cfa: |
| 1697 | if (i->u.ri.reg != j->u.ri.reg) |
| 1698 | goto fail; |
| 1699 | if (i->u.ri.offset != j->u.ri.offset) |
| 1700 | goto fail; |
| 1701 | break; |
| 1702 | |
| 1703 | case DW_CFA_register: |
| 1704 | if (i->u.rr.reg1 != j->u.rr.reg1) |
| 1705 | goto fail; |
| 1706 | if (i->u.rr.reg2 != j->u.rr.reg2) |
| 1707 | goto fail; |
| 1708 | break; |
| 1709 | |
| 1710 | case DW_CFA_def_cfa_register: |
| 1711 | case DW_CFA_restore: |
| 1712 | case DW_CFA_undefined: |
| 1713 | case DW_CFA_same_value: |
| 1714 | if (i->u.r != j->u.r) |
| 1715 | goto fail; |
| 1716 | break; |
| 1717 | |
| 1718 | case DW_CFA_def_cfa_offset: |
| 1719 | if (i->u.i != j->u.i) |
| 1720 | goto fail; |
| 1721 | break; |
| 1722 | |
| 1723 | case CFI_escape: |
| 1724 | case CFI_val_encoded_addr: |
| 1725 | /* Don't bother matching these for now. */ |
| 1726 | goto fail; |
| 1727 | |
| 1728 | default: |
| 1729 | abort (); |
| 1730 | } |
| 1731 | } |
| 1732 | |
| 1733 | /* Success if we reached the end of the CIE list, and we've either |
| 1734 | run out of FDE entries or we've encountered an advance, |
| 1735 | remember, or escape. */ |
| 1736 | if (i == cie->last |
| 1737 | && (!j |
| 1738 | || j->insn == DW_CFA_advance_loc |
| 1739 | || j->insn == DW_CFA_remember_state |
| 1740 | || j->insn == CFI_escape |
| 1741 | || j->insn == CFI_val_encoded_addr)) |
| 1742 | { |
| 1743 | *pfirst = j; |
| 1744 | return cie; |
| 1745 | } |
| 1746 | |
| 1747 | fail:; |
| 1748 | } |
| 1749 | |
| 1750 | cie = (struct cie_entry *) xmalloc (sizeof (struct cie_entry)); |
| 1751 | cie->next = cie_root; |
| 1752 | cie_root = cie; |
| 1753 | SET_CUR_SEG (cie, CUR_SEG (fde)); |
| 1754 | cie->return_column = fde->return_column; |
| 1755 | cie->signal_frame = fde->signal_frame; |
| 1756 | cie->per_encoding = fde->per_encoding; |
| 1757 | cie->lsda_encoding = fde->lsda_encoding; |
| 1758 | cie->personality = fde->personality; |
| 1759 | cie->first = fde->data; |
| 1760 | |
| 1761 | for (i = cie->first; i ; i = i->next) |
| 1762 | if (i->insn == DW_CFA_advance_loc |
| 1763 | || i->insn == DW_CFA_remember_state |
| 1764 | || i->insn == CFI_escape |
| 1765 | || i->insn == CFI_val_encoded_addr) |
| 1766 | break; |
| 1767 | |
| 1768 | cie->last = i; |
| 1769 | *pfirst = i; |
| 1770 | |
| 1771 | output_cie (cie, eh_frame, align); |
| 1772 | |
| 1773 | return cie; |
| 1774 | } |
| 1775 | |
| 1776 | #ifdef md_reg_eh_frame_to_debug_frame |
| 1777 | static void |
| 1778 | cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg) |
| 1779 | { |
| 1780 | for (; insn; insn = insn->next) |
| 1781 | { |
| 1782 | if (CUR_SEG (insn) != ccseg) |
| 1783 | continue; |
| 1784 | switch (insn->insn) |
| 1785 | { |
| 1786 | case DW_CFA_advance_loc: |
| 1787 | case DW_CFA_def_cfa_offset: |
| 1788 | case DW_CFA_remember_state: |
| 1789 | case DW_CFA_restore_state: |
| 1790 | case DW_CFA_GNU_window_save: |
| 1791 | case CFI_escape: |
| 1792 | break; |
| 1793 | |
| 1794 | case DW_CFA_def_cfa: |
| 1795 | case DW_CFA_offset: |
| 1796 | insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg); |
| 1797 | break; |
| 1798 | |
| 1799 | case DW_CFA_def_cfa_register: |
| 1800 | case DW_CFA_undefined: |
| 1801 | case DW_CFA_same_value: |
| 1802 | case DW_CFA_restore: |
| 1803 | insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r); |
| 1804 | break; |
| 1805 | |
| 1806 | case DW_CFA_register: |
| 1807 | insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1); |
| 1808 | insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2); |
| 1809 | break; |
| 1810 | |
| 1811 | case CFI_val_encoded_addr: |
| 1812 | insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg); |
| 1813 | break; |
| 1814 | |
| 1815 | default: |
| 1816 | abort (); |
| 1817 | } |
| 1818 | } |
| 1819 | } |
| 1820 | #else |
| 1821 | #define cfi_change_reg_numbers(insn, cseg) do { } while (0) |
| 1822 | #endif |
| 1823 | |
| 1824 | static segT |
| 1825 | get_cfi_seg (segT cseg, const char *base, flagword flags, int align) |
| 1826 | { |
| 1827 | if (SUPPORT_FRAME_LINKONCE) |
| 1828 | { |
| 1829 | struct dwcfi_seg_list *l; |
| 1830 | |
| 1831 | l = dwcfi_hash_find_or_make (cseg, base, flags); |
| 1832 | |
| 1833 | cseg = l->seg; |
| 1834 | subseg_set (cseg, l->subseg); |
| 1835 | } |
| 1836 | else |
| 1837 | { |
| 1838 | cseg = subseg_new (base, 0); |
| 1839 | bfd_set_section_flags (stdoutput, cseg, flags); |
| 1840 | } |
| 1841 | record_alignment (cseg, align); |
| 1842 | return cseg; |
| 1843 | } |
| 1844 | |
| 1845 | void |
| 1846 | cfi_finish (void) |
| 1847 | { |
| 1848 | struct cie_entry *cie, *cie_next; |
| 1849 | segT cfi_seg, ccseg; |
| 1850 | struct fde_entry *fde; |
| 1851 | struct cfi_insn_data *first; |
| 1852 | int save_flag_traditional_format, seek_next_seg; |
| 1853 | |
| 1854 | if (all_fde_data == 0) |
| 1855 | return; |
| 1856 | |
| 1857 | if ((cfi_sections & CFI_EMIT_eh_frame) != 0) |
| 1858 | { |
| 1859 | /* Make sure check_eh_frame doesn't do anything with our output. */ |
| 1860 | save_flag_traditional_format = flag_traditional_format; |
| 1861 | flag_traditional_format = 1; |
| 1862 | |
| 1863 | if (!SUPPORT_FRAME_LINKONCE) |
| 1864 | { |
| 1865 | /* Open .eh_frame section. */ |
| 1866 | cfi_seg = get_cfi_seg (NULL, ".eh_frame", |
| 1867 | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| 1868 | | DWARF2_EH_FRAME_READ_ONLY), |
| 1869 | EH_FRAME_ALIGNMENT); |
| 1870 | #ifdef md_fix_up_eh_frame |
| 1871 | md_fix_up_eh_frame (cfi_seg); |
| 1872 | #else |
| 1873 | (void) cfi_seg; |
| 1874 | #endif |
| 1875 | } |
| 1876 | |
| 1877 | do |
| 1878 | { |
| 1879 | ccseg = NULL; |
| 1880 | seek_next_seg = 0; |
| 1881 | |
| 1882 | for (cie = cie_root; cie; cie = cie_next) |
| 1883 | { |
| 1884 | cie_next = cie->next; |
| 1885 | free ((void *) cie); |
| 1886 | } |
| 1887 | cie_root = NULL; |
| 1888 | |
| 1889 | for (fde = all_fde_data; fde ; fde = fde->next) |
| 1890 | { |
| 1891 | if (SUPPORT_FRAME_LINKONCE) |
| 1892 | { |
| 1893 | if (HANDLED (fde)) |
| 1894 | continue; |
| 1895 | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| 1896 | { |
| 1897 | seek_next_seg = 2; |
| 1898 | continue; |
| 1899 | } |
| 1900 | if (!seek_next_seg) |
| 1901 | { |
| 1902 | ccseg = CUR_SEG (fde); |
| 1903 | /* Open .eh_frame section. */ |
| 1904 | cfi_seg = get_cfi_seg (ccseg, ".eh_frame", |
| 1905 | (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| 1906 | | DWARF2_EH_FRAME_READ_ONLY), |
| 1907 | EH_FRAME_ALIGNMENT); |
| 1908 | #ifdef md_fix_up_eh_frame |
| 1909 | md_fix_up_eh_frame (cfi_seg); |
| 1910 | #else |
| 1911 | (void) cfi_seg; |
| 1912 | #endif |
| 1913 | seek_next_seg = 1; |
| 1914 | } |
| 1915 | SET_HANDLED (fde, 1); |
| 1916 | } |
| 1917 | |
| 1918 | if (fde->end_address == NULL) |
| 1919 | { |
| 1920 | as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); |
| 1921 | fde->end_address = fde->start_address; |
| 1922 | } |
| 1923 | |
| 1924 | cie = select_cie_for_fde (fde, TRUE, &first, 2); |
| 1925 | output_fde (fde, cie, TRUE, first, |
| 1926 | fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); |
| 1927 | } |
| 1928 | } |
| 1929 | while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); |
| 1930 | |
| 1931 | if (SUPPORT_FRAME_LINKONCE) |
| 1932 | for (fde = all_fde_data; fde ; fde = fde->next) |
| 1933 | SET_HANDLED (fde, 0); |
| 1934 | |
| 1935 | flag_traditional_format = save_flag_traditional_format; |
| 1936 | } |
| 1937 | |
| 1938 | if ((cfi_sections & CFI_EMIT_debug_frame) != 0) |
| 1939 | { |
| 1940 | int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; |
| 1941 | |
| 1942 | if (!SUPPORT_FRAME_LINKONCE) |
| 1943 | get_cfi_seg (NULL, ".debug_frame", |
| 1944 | SEC_READONLY | SEC_DEBUGGING, |
| 1945 | alignment); |
| 1946 | |
| 1947 | do |
| 1948 | { |
| 1949 | ccseg = NULL; |
| 1950 | seek_next_seg = 0; |
| 1951 | |
| 1952 | for (cie = cie_root; cie; cie = cie_next) |
| 1953 | { |
| 1954 | cie_next = cie->next; |
| 1955 | free ((void *) cie); |
| 1956 | } |
| 1957 | cie_root = NULL; |
| 1958 | |
| 1959 | for (fde = all_fde_data; fde ; fde = fde->next) |
| 1960 | { |
| 1961 | if (SUPPORT_FRAME_LINKONCE) |
| 1962 | { |
| 1963 | if (HANDLED (fde)) |
| 1964 | continue; |
| 1965 | if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| 1966 | { |
| 1967 | seek_next_seg = 2; |
| 1968 | continue; |
| 1969 | } |
| 1970 | if (!seek_next_seg) |
| 1971 | { |
| 1972 | ccseg = CUR_SEG (fde); |
| 1973 | /* Open .debug_frame section. */ |
| 1974 | get_cfi_seg (ccseg, ".debug_frame", |
| 1975 | SEC_READONLY | SEC_DEBUGGING, |
| 1976 | alignment); |
| 1977 | seek_next_seg = 1; |
| 1978 | } |
| 1979 | SET_HANDLED (fde, 1); |
| 1980 | } |
| 1981 | if (fde->end_address == NULL) |
| 1982 | { |
| 1983 | as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); |
| 1984 | fde->end_address = fde->start_address; |
| 1985 | } |
| 1986 | |
| 1987 | fde->per_encoding = DW_EH_PE_omit; |
| 1988 | fde->lsda_encoding = DW_EH_PE_omit; |
| 1989 | cfi_change_reg_numbers (fde->data, ccseg); |
| 1990 | cie = select_cie_for_fde (fde, FALSE, &first, alignment); |
| 1991 | output_fde (fde, cie, FALSE, first, alignment); |
| 1992 | } |
| 1993 | } |
| 1994 | while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); |
| 1995 | |
| 1996 | if (SUPPORT_FRAME_LINKONCE) |
| 1997 | for (fde = all_fde_data; fde ; fde = fde->next) |
| 1998 | SET_HANDLED (fde, 0); |
| 1999 | } |
| 2000 | } |
| 2001 | |
| 2002 | #else /* TARGET_USE_CFIPOP */ |
| 2003 | |
| 2004 | /* Emit an intelligible error message for missing support. */ |
| 2005 | |
| 2006 | static void |
| 2007 | dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED) |
| 2008 | { |
| 2009 | as_bad (_("CFI is not supported for this target")); |
| 2010 | ignore_rest_of_line (); |
| 2011 | } |
| 2012 | |
| 2013 | const pseudo_typeS cfi_pseudo_table[] = |
| 2014 | { |
| 2015 | { "cfi_sections", dot_cfi_dummy, 0 }, |
| 2016 | { "cfi_startproc", dot_cfi_dummy, 0 }, |
| 2017 | { "cfi_endproc", dot_cfi_dummy, 0 }, |
| 2018 | { "cfi_def_cfa", dot_cfi_dummy, 0 }, |
| 2019 | { "cfi_def_cfa_register", dot_cfi_dummy, 0 }, |
| 2020 | { "cfi_def_cfa_offset", dot_cfi_dummy, 0 }, |
| 2021 | { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 }, |
| 2022 | { "cfi_offset", dot_cfi_dummy, 0 }, |
| 2023 | { "cfi_rel_offset", dot_cfi_dummy, 0 }, |
| 2024 | { "cfi_register", dot_cfi_dummy, 0 }, |
| 2025 | { "cfi_return_column", dot_cfi_dummy, 0 }, |
| 2026 | { "cfi_restore", dot_cfi_dummy, 0 }, |
| 2027 | { "cfi_undefined", dot_cfi_dummy, 0 }, |
| 2028 | { "cfi_same_value", dot_cfi_dummy, 0 }, |
| 2029 | { "cfi_remember_state", dot_cfi_dummy, 0 }, |
| 2030 | { "cfi_restore_state", dot_cfi_dummy, 0 }, |
| 2031 | { "cfi_window_save", dot_cfi_dummy, 0 }, |
| 2032 | { "cfi_escape", dot_cfi_dummy, 0 }, |
| 2033 | { "cfi_signal_frame", dot_cfi_dummy, 0 }, |
| 2034 | { "cfi_personality", dot_cfi_dummy, 0 }, |
| 2035 | { "cfi_lsda", dot_cfi_dummy, 0 }, |
| 2036 | { "cfi_val_encoded_addr", dot_cfi_dummy, 0 }, |
| 2037 | { NULL, NULL, 0 } |
| 2038 | }; |
| 2039 | |
| 2040 | void |
| 2041 | cfi_finish (void) |
| 2042 | { |
| 2043 | } |
| 2044 | #endif /* TARGET_USE_CFIPOP */ |