1 /* dw2gencfi.c - Support for generating Dwarf2 CFI information.
2 Copyright (C) 2003-2019 Free Software Foundation, Inc.
3 Contributed by Michal Ludvig <mludvig@suse.cz>
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
23 #include "dw2gencfi.h"
25 #include "dwarf2dbg.h"
27 #ifdef TARGET_USE_CFIPOP
29 /* By default, use difference expressions if DIFF_EXPR_OK is defined. */
30 #ifndef CFI_DIFF_EXPR_OK
32 # define CFI_DIFF_EXPR_OK 1
34 # define CFI_DIFF_EXPR_OK 0
38 #ifndef CFI_DIFF_LSDA_OK
39 #define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK
42 #if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0
43 # error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK"
46 /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
47 of the CIE. Default to 1 if not otherwise specified. */
48 #ifndef DWARF2_LINE_MIN_INSN_LENGTH
49 #define DWARF2_LINE_MIN_INSN_LENGTH 1
52 /* By default, use 32-bit relocations from .eh_frame into .text. */
53 #ifndef DWARF2_FDE_RELOC_SIZE
54 #define DWARF2_FDE_RELOC_SIZE 4
57 /* By default, use a read-only .eh_frame section. */
58 #ifndef DWARF2_EH_FRAME_READ_ONLY
59 #define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY
62 #ifndef EH_FRAME_ALIGNMENT
63 #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
66 #ifndef tc_cfi_frame_initial_instructions
67 #define tc_cfi_frame_initial_instructions() ((void)0)
70 #ifndef tc_cfi_startproc
71 # define tc_cfi_startproc() ((void)0)
74 #ifndef tc_cfi_endproc
75 # define tc_cfi_endproc(fde) ((void) (fde))
78 #define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh)
81 #define DWARF2_FORMAT(SEC) dwarf2_format_32bit
84 #ifndef DWARF2_ADDR_SIZE
85 #define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
88 #if MULTIPLE_FRAME_SECTIONS
89 #define CUR_SEG(structp) structp->cur_seg
90 #define SET_CUR_SEG(structp, seg) structp->cur_seg = seg
91 #define HANDLED(structp) structp->handled
92 #define SET_HANDLED(structp, val) structp->handled = val
94 #define CUR_SEG(structp) NULL
95 #define SET_CUR_SEG(structp, seg) (void) (0 && seg)
96 #define HANDLED(structp) 0
97 #define SET_HANDLED(structp, val) (void) (0 && val)
100 #ifndef tc_cfi_reloc_for_encoding
101 #define tc_cfi_reloc_for_encoding(e) BFD_RELOC_NONE
104 /* Private segment collection list. */
105 struct dwcfi_seg_list
112 #ifdef SUPPORT_COMPACT_EH
113 static bfd_boolean compact_eh;
118 static struct hash_control *dwcfi_hash;
120 /* Emit a single byte into the current segment. */
125 FRAG_APPEND_1_CHAR (byte);
128 /* Emit a two-byte word into the current segment. */
133 md_number_to_chars (frag_more (2), data, 2);
136 /* Emit a four byte word into the current segment. */
141 md_number_to_chars (frag_more (4), data, 4);
144 /* Emit an unsigned "little-endian base 128" number. */
147 out_uleb128 (addressT value)
149 output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
152 /* Emit an unsigned "little-endian base 128" number. */
155 out_sleb128 (offsetT value)
157 output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
161 encoding_size (unsigned char encoding)
163 if (encoding == DW_EH_PE_omit)
165 switch (encoding & 0x7)
168 return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4;
169 case DW_EH_PE_udata2:
171 case DW_EH_PE_udata4:
173 case DW_EH_PE_udata8:
180 /* Emit expression EXP in ENCODING. If EMIT_ENCODING is true, first
181 emit a byte containing ENCODING. */
184 emit_expr_encoded (expressionS *exp, int encoding, bfd_boolean emit_encoding)
186 unsigned int size = encoding_size (encoding);
187 bfd_reloc_code_real_type code;
189 if (encoding == DW_EH_PE_omit)
195 code = tc_cfi_reloc_for_encoding (encoding);
196 if (code != BFD_RELOC_NONE)
198 reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
199 char *p = frag_more (size);
200 gas_assert (size == (unsigned) howto->bitsize / 8);
201 md_number_to_chars (p, 0, size);
202 fix_new (frag_now, p - frag_now->fr_literal, size, exp->X_add_symbol,
203 exp->X_add_number, howto->pc_relative, code);
205 else if ((encoding & 0x70) == DW_EH_PE_pcrel)
208 expressionS tmp = *exp;
209 tmp.X_op = O_subtract;
210 tmp.X_op_symbol = symbol_temp_new_now ();
211 emit_expr (&tmp, size);
212 #elif defined (tc_cfi_emit_pcrel_expr)
213 tc_cfi_emit_pcrel_expr (exp, size);
219 emit_expr (exp, size);
222 /* Build based on segment the derived .debug_...
223 segment name containing origin segment's postfix name part. */
226 get_debugseg_name (segT seg, const char *base_name)
233 return concat (base_name, NULL);
235 name = bfd_get_section_name (stdoutput, seg);
237 if (name == NULL || *name == 0)
238 return concat (base_name, NULL);
240 dollar = strchr (name, '$');
241 dot = strchr (name + 1, '.');
245 if (!strcmp (base_name, ".eh_frame_entry")
246 && strcmp (name, ".text") != 0)
247 return concat (base_name, ".", name, NULL);
255 else if (dot < dollar)
260 return concat (base_name, name, NULL);
263 /* Allocate a dwcfi_seg_list structure. */
265 static struct dwcfi_seg_list *
266 alloc_debugseg_item (segT seg, int subseg, char *name)
268 struct dwcfi_seg_list *r;
270 r = (struct dwcfi_seg_list *)
271 xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name));
279 is_now_linkonce_segment (void)
284 if ((bfd_get_section_flags (stdoutput, now_seg)
285 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
286 | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
287 | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0)
292 /* Generate debug... segment with same linkonce properties
296 make_debug_seg (segT cseg, char *name, int sflags)
298 segT save_seg = now_seg;
299 int save_subseg = now_subseg;
303 r = subseg_new (name, 0);
305 /* Check if code segment is marked as linked once. */
309 flags = bfd_get_section_flags (stdoutput, cseg)
310 & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
311 | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
312 | SEC_LINK_DUPLICATES_SAME_CONTENTS);
314 /* Add standard section flags. */
317 /* Apply possibly linked once flags to new generated segment, too. */
318 if (!bfd_set_section_flags (stdoutput, r, flags))
319 as_bad (_("bfd_set_section_flags: %s"),
320 bfd_errmsg (bfd_get_error ()));
322 /* Restore to previous segment. */
323 if (save_seg != NULL)
324 subseg_set (save_seg, save_subseg);
329 dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item)
331 const char *error_string;
333 if ((error_string = hash_jam (dwcfi_hash, name, (char *) item)))
334 as_fatal (_("Inserting \"%s\" into structure table failed: %s"),
338 static struct dwcfi_seg_list *
339 dwcfi_hash_find (char *name)
341 return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name);
344 static struct dwcfi_seg_list *
345 dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags)
347 struct dwcfi_seg_list *item;
350 /* Initialize dwcfi_hash once. */
352 dwcfi_hash = hash_new ();
354 name = get_debugseg_name (cseg, base_name);
356 item = dwcfi_hash_find (name);
359 item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name);
361 dwcfi_hash_insert (item->seg_name, item);
369 /* ??? Share this with dwarf2cfg.c. */
370 #ifndef TC_DWARF2_EMIT_OFFSET
371 #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset
373 /* Create an offset to .dwarf2_*. */
376 generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size)
381 exp.X_add_symbol = symbol;
382 exp.X_add_number = 0;
383 emit_expr (&exp, size);
387 struct cfi_escape_data
389 struct cfi_escape_data *next;
395 struct cie_entry *next;
396 #if MULTIPLE_FRAME_SECTIONS
399 symbolS *start_address;
400 unsigned int return_column;
401 unsigned int signal_frame;
402 unsigned char fde_encoding;
403 unsigned char per_encoding;
404 unsigned char lsda_encoding;
405 expressionS personality;
406 #ifdef tc_cie_entry_extras
409 struct cfi_insn_data *first, *last;
412 /* List of FDE entries. */
414 struct fde_entry *all_fde_data;
415 static struct fde_entry **last_fde_data = &all_fde_data;
417 /* List of CIEs so that they could be reused. */
418 static struct cie_entry *cie_root;
420 /* Construct a new FDE structure and add it to the end of the fde list. */
422 static struct fde_entry *
423 alloc_fde_entry (void)
425 struct fde_entry *fde = XCNEW (struct fde_entry);
427 frchain_now->frch_cfi_data = XCNEW (struct frch_cfi_data);
428 frchain_now->frch_cfi_data->cur_fde_data = fde;
429 *last_fde_data = fde;
430 last_fde_data = &fde->next;
431 SET_CUR_SEG (fde, is_now_linkonce_segment ());
432 SET_HANDLED (fde, 0);
433 fde->last = &fde->data;
434 fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
435 fde->per_encoding = DW_EH_PE_omit;
436 fde->lsda_encoding = DW_EH_PE_omit;
437 fde->eh_header_type = EH_COMPACT_UNKNOWN;
438 #ifdef tc_fde_entry_init_extra
439 tc_fde_entry_init_extra (fde)
445 /* The following functions are available for a backend to construct its
446 own unwind information, usually from legacy unwind directives. */
448 /* Construct a new INSN structure and add it to the end of the insn list
449 for the currently active FDE. */
451 static bfd_boolean cfi_sections_set = FALSE;
452 static int cfi_sections = CFI_EMIT_eh_frame;
453 int all_cfi_sections = 0;
454 static struct fde_entry *last_fde;
456 static struct cfi_insn_data *
457 alloc_cfi_insn_data (void)
459 struct cfi_insn_data *insn = XCNEW (struct cfi_insn_data);
460 struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data;
462 *cur_fde_data->last = insn;
463 cur_fde_data->last = &insn->next;
464 SET_CUR_SEG (insn, is_now_linkonce_segment ());
468 /* Construct a new FDE structure that begins at LABEL. */
471 cfi_new_fde (symbolS *label)
473 struct fde_entry *fde = alloc_fde_entry ();
474 fde->start_address = label;
475 frchain_now->frch_cfi_data->last_address = label;
478 /* End the currently open FDE. */
481 cfi_end_fde (symbolS *label)
483 frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
484 free (frchain_now->frch_cfi_data);
485 frchain_now->frch_cfi_data = NULL;
488 /* Set the return column for the current FDE. */
491 cfi_set_return_column (unsigned regno)
493 frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
497 cfi_set_sections (void)
499 frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections;
500 cfi_sections_set = TRUE;
503 /* Universal functions to store new instructions. */
506 cfi_add_CFA_insn (int insn)
508 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
510 insn_ptr->insn = insn;
514 cfi_add_CFA_insn_reg (int insn, unsigned regno)
516 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
518 insn_ptr->insn = insn;
519 insn_ptr->u.r = regno;
523 cfi_add_CFA_insn_offset (int insn, offsetT offset)
525 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
527 insn_ptr->insn = insn;
528 insn_ptr->u.i = offset;
532 cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2)
534 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
536 insn_ptr->insn = insn;
537 insn_ptr->u.rr.reg1 = reg1;
538 insn_ptr->u.rr.reg2 = reg2;
542 cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset)
544 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
546 insn_ptr->insn = insn;
547 insn_ptr->u.ri.reg = regno;
548 insn_ptr->u.ri.offset = offset;
551 /* Add a CFI insn to advance the PC from the last address to LABEL. */
554 cfi_add_advance_loc (symbolS *label)
556 struct cfi_insn_data *insn = alloc_cfi_insn_data ();
558 insn->insn = DW_CFA_advance_loc;
559 insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
560 insn->u.ll.lab2 = label;
562 frchain_now->frch_cfi_data->last_address = label;
565 /* Add a CFI insn to label the current position in the CFI segment. */
568 cfi_add_label (const char *name)
570 unsigned int len = strlen (name) + 1;
571 struct cfi_insn_data *insn = alloc_cfi_insn_data ();
573 insn->insn = CFI_label;
574 obstack_grow (¬es, name, len);
575 insn->u.sym_name = (char *) obstack_finish (¬es);
578 /* Add a DW_CFA_offset record to the CFI data. */
581 cfi_add_CFA_offset (unsigned regno, offsetT offset)
583 unsigned int abs_data_align;
585 gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
586 cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset);
588 abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
589 ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
590 if (offset % abs_data_align)
591 as_bad (_("register save offset not a multiple of %u"), abs_data_align);
594 /* Add a DW_CFA_val_offset record to the CFI data. */
597 cfi_add_CFA_val_offset (unsigned regno, offsetT offset)
599 unsigned int abs_data_align;
601 gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
602 cfi_add_CFA_insn_reg_offset (DW_CFA_val_offset, regno, offset);
604 abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
605 ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
606 if (offset % abs_data_align)
607 as_bad (_("register save offset not a multiple of %u"), abs_data_align);
610 /* Add a DW_CFA_def_cfa record to the CFI data. */
613 cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
615 cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
616 frchain_now->frch_cfi_data->cur_cfa_offset = offset;
619 /* Add a DW_CFA_register record to the CFI data. */
622 cfi_add_CFA_register (unsigned reg1, unsigned reg2)
624 cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2);
627 /* Add a DW_CFA_def_cfa_register record to the CFI data. */
630 cfi_add_CFA_def_cfa_register (unsigned regno)
632 cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno);
635 /* Add a DW_CFA_def_cfa_offset record to the CFI data. */
638 cfi_add_CFA_def_cfa_offset (offsetT offset)
640 cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
641 frchain_now->frch_cfi_data->cur_cfa_offset = offset;
645 cfi_add_CFA_restore (unsigned regno)
647 cfi_add_CFA_insn_reg (DW_CFA_restore, regno);
651 cfi_add_CFA_undefined (unsigned regno)
653 cfi_add_CFA_insn_reg (DW_CFA_undefined, regno);
657 cfi_add_CFA_same_value (unsigned regno)
659 cfi_add_CFA_insn_reg (DW_CFA_same_value, regno);
663 cfi_add_CFA_remember_state (void)
665 struct cfa_save_data *p;
667 cfi_add_CFA_insn (DW_CFA_remember_state);
669 p = XNEW (struct cfa_save_data);
670 p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset;
671 p->next = frchain_now->frch_cfi_data->cfa_save_stack;
672 frchain_now->frch_cfi_data->cfa_save_stack = p;
676 cfi_add_CFA_restore_state (void)
678 struct cfa_save_data *p;
680 cfi_add_CFA_insn (DW_CFA_restore_state);
682 p = frchain_now->frch_cfi_data->cfa_save_stack;
685 frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset;
686 frchain_now->frch_cfi_data->cfa_save_stack = p->next;
690 as_bad (_("CFI state restore without previous remember"));
694 /* Parse CFI assembler directives. */
696 static void dot_cfi (int);
697 static void dot_cfi_escape (int);
698 static void dot_cfi_sections (int);
699 static void dot_cfi_startproc (int);
700 static void dot_cfi_endproc (int);
701 static void dot_cfi_fde_data (int);
702 static void dot_cfi_personality (int);
703 static void dot_cfi_personality_id (int);
704 static void dot_cfi_lsda (int);
705 static void dot_cfi_val_encoded_addr (int);
706 static void dot_cfi_inline_lsda (int);
707 static void dot_cfi_label (int);
709 const pseudo_typeS cfi_pseudo_table[] =
711 { "cfi_sections", dot_cfi_sections, 0 },
712 { "cfi_startproc", dot_cfi_startproc, 0 },
713 { "cfi_endproc", dot_cfi_endproc, 0 },
714 { "cfi_fde_data", dot_cfi_fde_data, 0 },
715 { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa },
716 { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register },
717 { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset },
718 { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
719 { "cfi_offset", dot_cfi, DW_CFA_offset },
720 { "cfi_rel_offset", dot_cfi, CFI_rel_offset },
721 { "cfi_register", dot_cfi, DW_CFA_register },
722 { "cfi_return_column", dot_cfi, CFI_return_column },
723 { "cfi_restore", dot_cfi, DW_CFA_restore },
724 { "cfi_undefined", dot_cfi, DW_CFA_undefined },
725 { "cfi_same_value", dot_cfi, DW_CFA_same_value },
726 { "cfi_remember_state", dot_cfi, DW_CFA_remember_state },
727 { "cfi_restore_state", dot_cfi, DW_CFA_restore_state },
728 { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save },
729 { "cfi_escape", dot_cfi_escape, 0 },
730 { "cfi_signal_frame", dot_cfi, CFI_signal_frame },
731 { "cfi_personality", dot_cfi_personality, 0 },
732 { "cfi_personality_id", dot_cfi_personality_id, 0 },
733 { "cfi_lsda", dot_cfi_lsda, 0 },
734 { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 },
735 { "cfi_inline_lsda", dot_cfi_inline_lsda, 0 },
736 { "cfi_label", dot_cfi_label, 0 },
737 { "cfi_val_offset", dot_cfi, DW_CFA_val_offset },
742 cfi_parse_separator (void)
745 if (*input_line_pointer == ',')
746 input_line_pointer++;
748 as_bad (_("missing separator"));
751 #ifndef tc_parse_to_dw2regnum
753 tc_parse_to_dw2regnum (expressionS *exp)
755 # ifdef tc_regname_to_dw2regnum
757 if (is_name_beginner (*input_line_pointer)
758 || (*input_line_pointer == '%'
759 && is_name_beginner (*++input_line_pointer)))
763 c = get_symbol_name (& name);
765 exp->X_op = O_constant;
766 exp->X_add_number = tc_regname_to_dw2regnum (name);
768 restore_line_pointer (c);
772 expression_and_evaluate (exp);
782 tc_parse_to_dw2regnum (&exp);
787 regno = exp.X_add_number;
797 as_bad (_("bad register expression"));
805 cfi_parse_const (void)
807 return get_absolute_expression ();
816 if (frchain_now->frch_cfi_data == NULL)
818 as_bad (_("CFI instruction used without previous .cfi_startproc"));
819 ignore_rest_of_line ();
823 /* If the last address was not at the current PC, advance to current. */
824 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
825 || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
827 cfi_add_advance_loc (symbol_temp_new_now ());
832 reg1 = cfi_parse_reg ();
833 cfi_parse_separator ();
834 offset = cfi_parse_const ();
835 cfi_add_CFA_offset (reg1, offset);
838 case DW_CFA_val_offset:
839 reg1 = cfi_parse_reg ();
840 cfi_parse_separator ();
841 offset = cfi_parse_const ();
842 cfi_add_CFA_val_offset (reg1, offset);
846 reg1 = cfi_parse_reg ();
847 cfi_parse_separator ();
848 offset = cfi_parse_const ();
849 cfi_add_CFA_offset (reg1,
850 offset - frchain_now->frch_cfi_data->cur_cfa_offset);
854 reg1 = cfi_parse_reg ();
855 cfi_parse_separator ();
856 offset = cfi_parse_const ();
857 cfi_add_CFA_def_cfa (reg1, offset);
860 case DW_CFA_register:
861 reg1 = cfi_parse_reg ();
862 cfi_parse_separator ();
863 reg2 = cfi_parse_reg ();
864 cfi_add_CFA_register (reg1, reg2);
867 case DW_CFA_def_cfa_register:
868 reg1 = cfi_parse_reg ();
869 cfi_add_CFA_def_cfa_register (reg1);
872 case DW_CFA_def_cfa_offset:
873 offset = cfi_parse_const ();
874 cfi_add_CFA_def_cfa_offset (offset);
877 case CFI_adjust_cfa_offset:
878 offset = cfi_parse_const ();
879 cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
886 reg1 = cfi_parse_reg ();
887 cfi_add_CFA_restore (reg1);
889 if (*input_line_pointer != ',')
891 ++input_line_pointer;
895 case DW_CFA_undefined:
898 reg1 = cfi_parse_reg ();
899 cfi_add_CFA_undefined (reg1);
901 if (*input_line_pointer != ',')
903 ++input_line_pointer;
907 case DW_CFA_same_value:
908 reg1 = cfi_parse_reg ();
909 cfi_add_CFA_same_value (reg1);
912 case CFI_return_column:
913 reg1 = cfi_parse_reg ();
914 cfi_set_return_column (reg1);
917 case DW_CFA_remember_state:
918 cfi_add_CFA_remember_state ();
921 case DW_CFA_restore_state:
922 cfi_add_CFA_restore_state ();
925 case DW_CFA_GNU_window_save:
926 cfi_add_CFA_insn (DW_CFA_GNU_window_save);
929 case CFI_signal_frame:
930 frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
937 demand_empty_rest_of_line ();
941 dot_cfi_escape (int ignored ATTRIBUTE_UNUSED)
943 struct cfi_escape_data *head, **tail, *e;
944 struct cfi_insn_data *insn;
946 if (frchain_now->frch_cfi_data == NULL)
948 as_bad (_("CFI instruction used without previous .cfi_startproc"));
949 ignore_rest_of_line ();
953 /* If the last address was not at the current PC, advance to current. */
954 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
955 || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
957 cfi_add_advance_loc (symbol_temp_new_now ());
962 e = XNEW (struct cfi_escape_data);
963 do_parse_cons_expression (&e->exp, 1);
967 while (*input_line_pointer++ == ',');
970 insn = alloc_cfi_insn_data ();
971 insn->insn = CFI_escape;
974 --input_line_pointer;
975 demand_empty_rest_of_line ();
979 dot_cfi_personality (int ignored ATTRIBUTE_UNUSED)
981 struct fde_entry *fde;
984 if (frchain_now->frch_cfi_data == NULL)
986 as_bad (_("CFI instruction used without previous .cfi_startproc"));
987 ignore_rest_of_line ();
991 fde = frchain_now->frch_cfi_data->cur_fde_data;
992 encoding = cfi_parse_const ();
993 if (encoding == DW_EH_PE_omit)
995 demand_empty_rest_of_line ();
996 fde->per_encoding = encoding;
1000 if ((encoding & 0xff) != encoding
1001 || ((((encoding & 0x70) != 0
1002 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1003 && (encoding & 0x70) != DW_EH_PE_pcrel
1006 /* leb128 can be handled, but does something actually need it? */
1007 || (encoding & 7) == DW_EH_PE_uleb128
1008 || (encoding & 7) > DW_EH_PE_udata8)
1009 && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
1011 as_bad (_("invalid or unsupported encoding in .cfi_personality"));
1012 ignore_rest_of_line ();
1016 if (*input_line_pointer++ != ',')
1018 as_bad (_(".cfi_personality requires encoding and symbol arguments"));
1019 ignore_rest_of_line ();
1023 expression_and_evaluate (&fde->personality);
1024 switch (fde->personality.X_op)
1029 if ((encoding & 0x70) == DW_EH_PE_pcrel)
1030 encoding = DW_EH_PE_omit;
1033 encoding = DW_EH_PE_omit;
1037 fde->per_encoding = encoding;
1039 if (encoding == DW_EH_PE_omit)
1041 as_bad (_("wrong second argument to .cfi_personality"));
1042 ignore_rest_of_line ();
1046 demand_empty_rest_of_line ();
1050 dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED)
1052 struct fde_entry *fde;
1055 if (frchain_now->frch_cfi_data == NULL)
1057 as_bad (_("CFI instruction used without previous .cfi_startproc"));
1058 ignore_rest_of_line ();
1062 fde = frchain_now->frch_cfi_data->cur_fde_data;
1063 encoding = cfi_parse_const ();
1064 if (encoding == DW_EH_PE_omit)
1066 demand_empty_rest_of_line ();
1067 fde->lsda_encoding = encoding;
1071 if ((encoding & 0xff) != encoding
1072 || ((((encoding & 0x70) != 0
1073 #if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr
1074 && (encoding & 0x70) != DW_EH_PE_pcrel
1077 /* leb128 can be handled, but does something actually need it? */
1078 || (encoding & 7) == DW_EH_PE_uleb128
1079 || (encoding & 7) > DW_EH_PE_udata8)
1080 && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
1082 as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
1083 ignore_rest_of_line ();
1087 if (*input_line_pointer++ != ',')
1089 as_bad (_(".cfi_lsda requires encoding and symbol arguments"));
1090 ignore_rest_of_line ();
1094 fde->lsda_encoding = encoding;
1096 expression_and_evaluate (&fde->lsda);
1097 switch (fde->lsda.X_op)
1102 if ((encoding & 0x70) == DW_EH_PE_pcrel)
1103 encoding = DW_EH_PE_omit;
1106 encoding = DW_EH_PE_omit;
1110 fde->lsda_encoding = encoding;
1112 if (encoding == DW_EH_PE_omit)
1114 as_bad (_("wrong second argument to .cfi_lsda"));
1115 ignore_rest_of_line ();
1119 demand_empty_rest_of_line ();
1123 dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED)
1125 struct cfi_insn_data *insn_ptr;
1128 if (frchain_now->frch_cfi_data == NULL)
1130 as_bad (_("CFI instruction used without previous .cfi_startproc"));
1131 ignore_rest_of_line ();
1135 /* If the last address was not at the current PC, advance to current. */
1136 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
1137 || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
1138 != frag_now_fix ()))
1139 cfi_add_advance_loc (symbol_temp_new_now ());
1141 insn_ptr = alloc_cfi_insn_data ();
1142 insn_ptr->insn = CFI_val_encoded_addr;
1144 insn_ptr->u.ea.reg = cfi_parse_reg ();
1146 cfi_parse_separator ();
1147 encoding = cfi_parse_const ();
1148 if ((encoding & 0xff) != encoding
1149 || ((encoding & 0x70) != 0
1150 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1151 && (encoding & 0x70) != DW_EH_PE_pcrel
1154 /* leb128 can be handled, but does something actually need it? */
1155 || (encoding & 7) == DW_EH_PE_uleb128
1156 || (encoding & 7) > DW_EH_PE_udata8)
1158 as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
1159 encoding = DW_EH_PE_omit;
1162 cfi_parse_separator ();
1163 expression_and_evaluate (&insn_ptr->u.ea.exp);
1164 switch (insn_ptr->u.ea.exp.X_op)
1169 if ((encoding & 0x70) != DW_EH_PE_pcrel)
1173 encoding = DW_EH_PE_omit;
1177 insn_ptr->u.ea.encoding = encoding;
1178 if (encoding == DW_EH_PE_omit)
1180 as_bad (_("wrong third argument to .cfi_val_encoded_addr"));
1181 ignore_rest_of_line ();
1185 demand_empty_rest_of_line ();
1189 dot_cfi_label (int ignored ATTRIBUTE_UNUSED)
1193 if (frchain_now->frch_cfi_data == NULL)
1195 as_bad (_("CFI instruction used without previous .cfi_startproc"));
1196 ignore_rest_of_line ();
1200 name = read_symbol_name ();
1204 /* If the last address was not at the current PC, advance to current. */
1205 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
1206 || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
1207 != frag_now_fix ()))
1208 cfi_add_advance_loc (symbol_temp_new_now ());
1210 cfi_add_label (name);
1213 demand_empty_rest_of_line ();
1217 dot_cfi_sections (int ignored ATTRIBUTE_UNUSED)
1222 if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"')
1228 saved_ilp = input_line_pointer;
1229 c = get_symbol_name (& name);
1231 if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0
1233 sections |= CFI_EMIT_eh_frame;
1234 else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0)
1235 sections |= CFI_EMIT_debug_frame;
1236 #if SUPPORT_COMPACT_EH
1237 else if (strncmp (name, ".eh_frame_entry",
1238 sizeof ".eh_frame_entry") == 0)
1241 sections |= CFI_EMIT_eh_frame_compact;
1244 #ifdef tc_cfi_section_name
1245 else if (strcmp (name, tc_cfi_section_name) == 0)
1246 sections |= CFI_EMIT_target;
1250 *input_line_pointer = c;
1251 input_line_pointer = saved_ilp;
1255 *input_line_pointer = c;
1256 SKIP_WHITESPACE_AFTER_NAME ();
1257 if (*input_line_pointer == ',')
1259 name = input_line_pointer++;
1261 if (!is_name_beginner (*input_line_pointer)
1262 && *input_line_pointer != '"')
1264 input_line_pointer = name;
1268 else if (is_name_beginner (*input_line_pointer)
1269 || *input_line_pointer == '"')
1273 demand_empty_rest_of_line ();
1274 if (cfi_sections_set
1275 && (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
1276 && ((cfi_sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
1277 != (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))))
1278 as_bad (_("inconsistent uses of .cfi_sections"));
1279 cfi_sections = sections;
1283 dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED)
1287 if (frchain_now->frch_cfi_data != NULL)
1289 as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
1290 ignore_rest_of_line ();
1294 cfi_new_fde (symbol_temp_new_now ());
1297 if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"')
1299 char * saved_ilp = input_line_pointer;
1302 c = get_symbol_name (& name);
1304 if (strcmp (name, "simple") == 0)
1307 restore_line_pointer (c);
1310 input_line_pointer = saved_ilp;
1312 demand_empty_rest_of_line ();
1314 cfi_sections_set = TRUE;
1315 all_cfi_sections |= cfi_sections;
1316 cfi_set_sections ();
1317 frchain_now->frch_cfi_data->cur_cfa_offset = 0;
1319 tc_cfi_frame_initial_instructions ();
1321 if ((cfi_sections & CFI_EMIT_target) != 0)
1322 tc_cfi_startproc ();
1326 dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
1328 if (frchain_now->frch_cfi_data == NULL)
1330 as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
1331 ignore_rest_of_line ();
1335 last_fde = frchain_now->frch_cfi_data->cur_fde_data;
1337 cfi_end_fde (symbol_temp_new_now ());
1339 demand_empty_rest_of_line ();
1341 cfi_sections_set = TRUE;
1342 if ((cfi_sections & CFI_EMIT_target) != 0)
1343 tc_cfi_endproc (last_fde);
1347 get_cfi_seg (segT cseg, const char *base, flagword flags, int align)
1349 /* Exclude .debug_frame sections for Compact EH. */
1350 if (SUPPORT_FRAME_LINKONCE || ((flags & SEC_DEBUGGING) == 0 && compact_eh))
1352 struct dwcfi_seg_list *l;
1354 l = dwcfi_hash_find_or_make (cseg, base, flags);
1357 subseg_set (cseg, l->subseg);
1361 cseg = subseg_new (base, 0);
1362 bfd_set_section_flags (stdoutput, cseg, flags);
1364 record_alignment (cseg, align);
1368 #if SUPPORT_COMPACT_EH
1370 dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
1372 struct fde_entry *fde;
1374 if (frchain_now->frch_cfi_data == NULL)
1376 as_bad (_("CFI instruction used without previous .cfi_startproc"));
1377 ignore_rest_of_line ();
1381 fde = frchain_now->frch_cfi_data->cur_fde_data;
1382 fde->personality_id = cfi_parse_const ();
1383 demand_empty_rest_of_line ();
1385 if (fde->personality_id == 0 || fde->personality_id > 3)
1387 as_bad (_("wrong argument to .cfi_personality_id"));
1393 dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
1395 if (frchain_now->frch_cfi_data == NULL)
1397 as_bad (_(".cfi_fde_data without corresponding .cfi_startproc"));
1398 ignore_rest_of_line ();
1402 last_fde = frchain_now->frch_cfi_data->cur_fde_data;
1404 cfi_sections_set = TRUE;
1405 if ((cfi_sections & CFI_EMIT_target) != 0
1406 || (cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
1408 struct cfi_escape_data *head, **tail, *e;
1412 if (!is_it_end_of_statement ())
1417 e = XNEW (struct cfi_escape_data);
1418 do_parse_cons_expression (&e->exp, 1);
1423 while (*input_line_pointer++ == ',');
1424 --input_line_pointer;
1428 if (last_fde->lsda_encoding != DW_EH_PE_omit)
1429 last_fde->eh_header_type = EH_COMPACT_HAS_LSDA;
1430 else if (num_ops <= 3 && last_fde->per_encoding == DW_EH_PE_omit)
1431 last_fde->eh_header_type = EH_COMPACT_INLINE;
1433 last_fde->eh_header_type = EH_COMPACT_OUTLINE;
1435 if (last_fde->eh_header_type == EH_COMPACT_INLINE)
1438 last_fde->eh_data_size = num_ops;
1439 last_fde->eh_data = XNEWVEC (bfd_byte, num_ops);
1445 last_fde->eh_data[num_ops++] = e->exp.X_add_number;
1448 if (last_fde->eh_header_type == EH_COMPACT_INLINE)
1450 last_fde->eh_data[num_ops++] = tc_compact_eh_opcode_stop;
1453 demand_empty_rest_of_line ();
1456 /* Function to emit the compact unwinding opcodes stored in the
1457 fde's eh_data field. The end of the opcode data will be
1458 padded to the value in align. */
1461 output_compact_unwind_data (struct fde_entry *fde, int align)
1463 int data_size = fde->eh_data_size + 2;
1468 fde->eh_loc = symbol_temp_new_now ();
1471 if (fde->personality_id != 0)
1472 *p = fde->personality_id;
1473 else if (fde->per_encoding != DW_EH_PE_omit)
1476 emit_expr_encoded (&fde->personality, fde->per_encoding, FALSE);
1477 data_size += encoding_size (fde->per_encoding);
1482 amask = (1 << align) - 1;
1483 align_padding = ((data_size + amask) & ~amask) - data_size;
1485 p = frag_more (fde->eh_data_size + 1 + align_padding);
1486 memcpy (p, fde->eh_data, fde->eh_data_size);
1487 p += fde->eh_data_size;
1489 while (align_padding-- > 0)
1490 *(p++) = tc_compact_eh_opcode_pad;
1492 *(p++) = tc_compact_eh_opcode_stop;
1493 fde->eh_header_type = EH_COMPACT_OUTLINE_DONE;
1496 /* Handle the .cfi_inline_lsda directive. */
1498 dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
1502 long max_alignment = 28;
1506 as_bad (_("unexpected .cfi_inline_lsda"));
1507 ignore_rest_of_line ();
1511 if ((last_fde->sections & CFI_EMIT_eh_frame_compact) == 0)
1513 as_bad (_(".cfi_inline_lsda not valid for this frame"));
1514 ignore_rest_of_line ();
1518 if (last_fde->eh_header_type != EH_COMPACT_UNKNOWN
1519 && last_fde->eh_header_type != EH_COMPACT_HAS_LSDA)
1521 as_bad (_(".cfi_inline_lsda seen for frame without .cfi_lsda"));
1522 ignore_rest_of_line ();
1526 #ifdef md_flush_pending_output
1527 md_flush_pending_output ();
1530 align = get_absolute_expression ();
1531 if (align > max_alignment)
1533 align = max_alignment;
1534 as_bad (_("Alignment too large: %d. assumed."), align);
1538 as_warn (_("Alignment negative: 0 assumed."));
1542 demand_empty_rest_of_line ();
1543 ccseg = CUR_SEG (last_fde);
1545 /* Open .gnu_extab section. */
1546 get_cfi_seg (ccseg, ".gnu_extab",
1547 (SEC_ALLOC | SEC_LOAD | SEC_DATA
1548 | DWARF2_EH_FRAME_READ_ONLY),
1551 frag_align (align, 0, 0);
1552 record_alignment (now_seg, align);
1553 if (last_fde->eh_header_type == EH_COMPACT_HAS_LSDA)
1554 output_compact_unwind_data (last_fde, align);
1560 #else /* !SUPPORT_COMPACT_EH */
1562 dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
1564 as_bad (_(".cfi_inline_lsda is not supported for this target"));
1565 ignore_rest_of_line ();
1569 dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
1571 as_bad (_(".cfi_fde_data is not supported for this target"));
1572 ignore_rest_of_line ();
1576 dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
1578 as_bad (_(".cfi_personality_id is not supported for this target"));
1579 ignore_rest_of_line ();
1584 output_cfi_insn (struct cfi_insn_data *insn)
1591 case DW_CFA_advance_loc:
1593 symbolS *from = insn->u.ll.lab1;
1594 symbolS *to = insn->u.ll.lab2;
1596 if (symbol_get_frag (to) == symbol_get_frag (from))
1598 addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
1599 addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
1602 out_one (DW_CFA_advance_loc + scaled);
1603 else if (scaled <= 0xFF)
1605 out_one (DW_CFA_advance_loc1);
1608 else if (scaled <= 0xFFFF)
1610 out_one (DW_CFA_advance_loc2);
1615 out_one (DW_CFA_advance_loc4);
1623 exp.X_op = O_subtract;
1624 exp.X_add_symbol = to;
1625 exp.X_op_symbol = from;
1626 exp.X_add_number = 0;
1628 /* The code in ehopt.c expects that one byte of the encoding
1629 is already allocated to the frag. This comes from the way
1630 that it scans the .eh_frame section looking first for the
1631 .byte DW_CFA_advance_loc4. */
1632 *frag_more (1) = DW_CFA_advance_loc4;
1634 frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
1635 make_expr_symbol (&exp), frag_now_fix () - 1,
1641 case DW_CFA_def_cfa:
1642 offset = insn->u.ri.offset;
1645 out_one (DW_CFA_def_cfa_sf);
1646 out_uleb128 (insn->u.ri.reg);
1647 out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
1651 out_one (DW_CFA_def_cfa);
1652 out_uleb128 (insn->u.ri.reg);
1653 out_uleb128 (offset);
1657 case DW_CFA_def_cfa_register:
1658 case DW_CFA_undefined:
1659 case DW_CFA_same_value:
1660 out_one (insn->insn);
1661 out_uleb128 (insn->u.r);
1664 case DW_CFA_def_cfa_offset:
1668 out_one (DW_CFA_def_cfa_offset_sf);
1669 out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
1673 out_one (DW_CFA_def_cfa_offset);
1674 out_uleb128 (offset);
1678 case DW_CFA_restore:
1682 out_one (DW_CFA_restore + regno);
1686 out_one (DW_CFA_restore_extended);
1687 out_uleb128 (regno);
1692 regno = insn->u.ri.reg;
1693 offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
1696 out_one (DW_CFA_offset_extended_sf);
1697 out_uleb128 (regno);
1698 out_sleb128 (offset);
1700 else if (regno <= 0x3F)
1702 out_one (DW_CFA_offset + regno);
1703 out_uleb128 (offset);
1707 out_one (DW_CFA_offset_extended);
1708 out_uleb128 (regno);
1709 out_uleb128 (offset);
1713 case DW_CFA_val_offset:
1714 regno = insn->u.ri.reg;
1715 offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
1718 out_one (DW_CFA_val_offset_sf);
1719 out_uleb128 (regno);
1720 out_sleb128 (offset);
1724 out_one (DW_CFA_val_offset);
1725 out_uleb128 (regno);
1726 out_uleb128 (offset);
1730 case DW_CFA_register:
1731 out_one (DW_CFA_register);
1732 out_uleb128 (insn->u.rr.reg1);
1733 out_uleb128 (insn->u.rr.reg2);
1736 case DW_CFA_remember_state:
1737 case DW_CFA_restore_state:
1738 out_one (insn->insn);
1741 case DW_CFA_GNU_window_save:
1742 out_one (DW_CFA_GNU_window_save);
1747 struct cfi_escape_data *e;
1748 for (e = insn->u.esc; e ; e = e->next)
1749 emit_expr (&e->exp, 1);
1753 case CFI_val_encoded_addr:
1755 unsigned encoding = insn->u.ea.encoding;
1758 if (encoding == DW_EH_PE_omit)
1760 out_one (DW_CFA_val_expression);
1761 out_uleb128 (insn->u.ea.reg);
1763 switch (encoding & 0x7)
1765 case DW_EH_PE_absptr:
1766 enc_size = DWARF2_ADDR_SIZE (stdoutput);
1768 case DW_EH_PE_udata2:
1771 case DW_EH_PE_udata4:
1774 case DW_EH_PE_udata8:
1781 /* If the user has requested absolute encoding,
1782 then use the smaller DW_OP_addr encoding. */
1783 if (insn->u.ea.encoding == DW_EH_PE_absptr)
1785 out_uleb128 (1 + enc_size);
1786 out_one (DW_OP_addr);
1790 out_uleb128 (1 + 1 + enc_size);
1791 out_one (DW_OP_GNU_encoded_addr);
1794 if ((encoding & 0x70) == DW_EH_PE_pcrel)
1796 #if CFI_DIFF_EXPR_OK
1797 insn->u.ea.exp.X_op = O_subtract;
1798 insn->u.ea.exp.X_op_symbol = symbol_temp_new_now ();
1799 #elif defined (tc_cfi_emit_pcrel_expr)
1800 tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, enc_size);
1807 emit_expr (&insn->u.ea.exp, enc_size);
1812 colon (insn->u.sym_name);
1821 output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align)
1823 symbolS *after_size_address, *end_address;
1825 struct cfi_insn_data *i;
1826 offsetT augmentation_size;
1828 enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
1830 cie->start_address = symbol_temp_new_now ();
1831 after_size_address = symbol_temp_make ();
1832 end_address = symbol_temp_make ();
1834 exp.X_op = O_subtract;
1835 exp.X_add_symbol = end_address;
1836 exp.X_op_symbol = after_size_address;
1837 exp.X_add_number = 0;
1839 if (eh_frame || fmt == dwarf2_format_32bit)
1840 emit_expr (&exp, 4); /* Length. */
1843 if (fmt == dwarf2_format_64bit)
1845 emit_expr (&exp, 8); /* Length. */
1847 symbol_set_value_now (after_size_address);
1849 out_four (0); /* CIE id. */
1852 out_four (-1); /* CIE id. */
1853 if (fmt != dwarf2_format_32bit)
1856 out_one (DW_CIE_VERSION); /* Version. */
1859 out_one ('z'); /* Augmentation. */
1860 if (cie->per_encoding != DW_EH_PE_omit)
1862 if (cie->lsda_encoding != DW_EH_PE_omit)
1865 #ifdef tc_output_cie_extra
1866 tc_output_cie_extra (cie);
1869 if (cie->signal_frame)
1872 out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */
1873 out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */
1874 if (DW_CIE_VERSION == 1) /* Return column. */
1875 out_one (cie->return_column);
1877 out_uleb128 (cie->return_column);
1880 augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit);
1881 if (cie->per_encoding != DW_EH_PE_omit)
1882 augmentation_size += 1 + encoding_size (cie->per_encoding);
1883 out_uleb128 (augmentation_size); /* Augmentation size. */
1885 emit_expr_encoded (&cie->personality, cie->per_encoding, TRUE);
1887 if (cie->lsda_encoding != DW_EH_PE_omit)
1888 out_one (cie->lsda_encoding);
1891 switch (DWARF2_FDE_RELOC_SIZE)
1894 enc = DW_EH_PE_sdata2;
1897 enc = DW_EH_PE_sdata4;
1900 enc = DW_EH_PE_sdata8;
1905 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1906 enc |= DW_EH_PE_pcrel;
1908 #ifdef DWARF2_FDE_RELOC_ENCODING
1909 /* Allow target to override encoding. */
1910 enc = DWARF2_FDE_RELOC_ENCODING (enc);
1912 cie->fde_encoding = enc;
1918 for (i = cie->first; i != cie->last; i = i->next)
1920 if (CUR_SEG (i) != CUR_SEG (cie))
1922 output_cfi_insn (i);
1926 frag_align (align, DW_CFA_nop, 0);
1927 symbol_set_value_now (end_address);
1931 output_fde (struct fde_entry *fde, struct cie_entry *cie,
1932 bfd_boolean eh_frame, struct cfi_insn_data *first,
1935 symbolS *after_size_address, *end_address;
1937 offsetT augmentation_size;
1938 enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
1939 unsigned int offset_size;
1940 unsigned int addr_size;
1942 after_size_address = symbol_temp_make ();
1943 end_address = symbol_temp_make ();
1945 exp.X_op = O_subtract;
1946 exp.X_add_symbol = end_address;
1947 exp.X_op_symbol = after_size_address;
1948 exp.X_add_number = 0;
1949 if (eh_frame || fmt == dwarf2_format_32bit)
1953 if (fmt == dwarf2_format_64bit)
1957 emit_expr (&exp, offset_size); /* Length. */
1958 symbol_set_value_now (after_size_address);
1962 exp.X_op = O_subtract;
1963 exp.X_add_symbol = after_size_address;
1964 exp.X_op_symbol = cie->start_address;
1965 exp.X_add_number = 0;
1966 emit_expr (&exp, offset_size); /* CIE offset. */
1970 TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size);
1973 exp.X_op = O_symbol;
1976 bfd_reloc_code_real_type code
1977 = tc_cfi_reloc_for_encoding (cie->fde_encoding);
1978 addr_size = DWARF2_FDE_RELOC_SIZE;
1979 if (code != BFD_RELOC_NONE)
1981 reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
1982 char *p = frag_more (addr_size);
1983 gas_assert (addr_size == (unsigned) howto->bitsize / 8);
1984 md_number_to_chars (p, 0, addr_size);
1985 fix_new (frag_now, p - frag_now->fr_literal, addr_size,
1986 fde->start_address, 0, howto->pc_relative, code);
1990 exp.X_op = O_subtract;
1991 exp.X_add_number = 0;
1992 #if CFI_DIFF_EXPR_OK
1993 exp.X_add_symbol = fde->start_address;
1994 exp.X_op_symbol = symbol_temp_new_now ();
1995 emit_expr (&exp, addr_size); /* Code offset. */
1997 exp.X_op = O_symbol;
1998 exp.X_add_symbol = fde->start_address;
2000 #if defined(tc_cfi_emit_pcrel_expr)
2001 tc_cfi_emit_pcrel_expr (&exp, addr_size); /* Code offset. */
2003 emit_expr (&exp, addr_size); /* Code offset. */
2010 exp.X_add_number = 0;
2011 exp.X_add_symbol = fde->start_address;
2012 addr_size = DWARF2_ADDR_SIZE (stdoutput);
2013 emit_expr (&exp, addr_size);
2016 exp.X_op = O_subtract;
2017 exp.X_add_symbol = fde->end_address;
2018 exp.X_op_symbol = fde->start_address; /* Code length. */
2019 exp.X_add_number = 0;
2020 emit_expr (&exp, addr_size);
2022 augmentation_size = encoding_size (fde->lsda_encoding);
2024 out_uleb128 (augmentation_size); /* Augmentation size. */
2026 emit_expr_encoded (&fde->lsda, cie->lsda_encoding, FALSE);
2028 for (; first; first = first->next)
2029 if (CUR_SEG (first) == CUR_SEG (fde))
2030 output_cfi_insn (first);
2032 frag_align (align, DW_CFA_nop, 0);
2033 symbol_set_value_now (end_address);
2036 static struct cie_entry *
2037 select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame,
2038 struct cfi_insn_data **pfirst, int align)
2040 struct cfi_insn_data *i, *j;
2041 struct cie_entry *cie;
2043 for (cie = cie_root; cie; cie = cie->next)
2045 if (CUR_SEG (cie) != CUR_SEG (fde))
2047 #ifdef tc_cie_fde_equivalent_extra
2048 if (!tc_cie_fde_equivalent_extra (cie, fde))
2051 if (cie->return_column != fde->return_column
2052 || cie->signal_frame != fde->signal_frame
2053 || cie->per_encoding != fde->per_encoding
2054 || cie->lsda_encoding != fde->lsda_encoding)
2056 if (cie->per_encoding != DW_EH_PE_omit)
2058 if (cie->personality.X_op != fde->personality.X_op
2059 || (cie->personality.X_add_number
2060 != fde->personality.X_add_number))
2062 switch (cie->personality.X_op)
2065 if (cie->personality.X_unsigned != fde->personality.X_unsigned)
2069 if (cie->personality.X_add_symbol
2070 != fde->personality.X_add_symbol)
2077 for (i = cie->first, j = fde->data;
2078 i != cie->last && j != NULL;
2079 i = i->next, j = j->next)
2081 if (i->insn != j->insn)
2085 case DW_CFA_advance_loc:
2086 case DW_CFA_remember_state:
2087 /* We reached the first advance/remember in the FDE,
2088 but did not reach the end of the CIE list. */
2092 case DW_CFA_def_cfa:
2093 if (i->u.ri.reg != j->u.ri.reg)
2095 if (i->u.ri.offset != j->u.ri.offset)
2099 case DW_CFA_register:
2100 if (i->u.rr.reg1 != j->u.rr.reg1)
2102 if (i->u.rr.reg2 != j->u.rr.reg2)
2106 case DW_CFA_def_cfa_register:
2107 case DW_CFA_restore:
2108 case DW_CFA_undefined:
2109 case DW_CFA_same_value:
2110 if (i->u.r != j->u.r)
2114 case DW_CFA_def_cfa_offset:
2115 if (i->u.i != j->u.i)
2120 case CFI_val_encoded_addr:
2122 /* Don't bother matching these for now. */
2130 /* Success if we reached the end of the CIE list, and we've either
2131 run out of FDE entries or we've encountered an advance,
2132 remember, or escape. */
2135 || j->insn == DW_CFA_advance_loc
2136 || j->insn == DW_CFA_remember_state
2137 || j->insn == CFI_escape
2138 || j->insn == CFI_val_encoded_addr
2139 || j->insn == CFI_label))
2148 cie = XNEW (struct cie_entry);
2149 cie->next = cie_root;
2151 SET_CUR_SEG (cie, CUR_SEG (fde));
2152 cie->return_column = fde->return_column;
2153 cie->signal_frame = fde->signal_frame;
2154 cie->per_encoding = fde->per_encoding;
2155 cie->lsda_encoding = fde->lsda_encoding;
2156 cie->personality = fde->personality;
2157 cie->first = fde->data;
2158 #ifdef tc_cie_entry_init_extra
2159 tc_cie_entry_init_extra (cie, fde)
2162 for (i = cie->first; i ; i = i->next)
2163 if (i->insn == DW_CFA_advance_loc
2164 || i->insn == DW_CFA_remember_state
2165 || i->insn == CFI_escape
2166 || i->insn == CFI_val_encoded_addr
2167 || i->insn == CFI_label)
2173 output_cie (cie, eh_frame, align);
2178 #ifdef md_reg_eh_frame_to_debug_frame
2180 cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg)
2182 for (; insn; insn = insn->next)
2184 if (CUR_SEG (insn) != ccseg)
2188 case DW_CFA_advance_loc:
2189 case DW_CFA_def_cfa_offset:
2190 case DW_CFA_remember_state:
2191 case DW_CFA_restore_state:
2192 case DW_CFA_GNU_window_save:
2197 case DW_CFA_def_cfa:
2199 insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg);
2202 case DW_CFA_def_cfa_register:
2203 case DW_CFA_undefined:
2204 case DW_CFA_same_value:
2205 case DW_CFA_restore:
2206 insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r);
2209 case DW_CFA_register:
2210 insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1);
2211 insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2);
2214 case CFI_val_encoded_addr:
2215 insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg);
2224 #define cfi_change_reg_numbers(insn, cseg) do { } while (0)
2227 #if SUPPORT_COMPACT_EH
2229 cfi_emit_eh_header (symbolS *sym, bfd_vma addend)
2233 exp.X_add_number = addend;
2234 exp.X_add_symbol = sym;
2235 emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, FALSE);
2239 output_eh_header (struct fde_entry *fde)
2244 if (fde->eh_header_type == EH_COMPACT_INLINE)
2249 cfi_emit_eh_header (fde->start_address, addend);
2251 if (fde->eh_header_type == EH_COMPACT_INLINE)
2254 /* Inline entries always use PR1. */
2256 memcpy(p, fde->eh_data, 3);
2260 if (fde->eh_header_type == EH_COMPACT_LEGACY)
2262 else if (fde->eh_header_type == EH_COMPACT_OUTLINE
2263 || fde->eh_header_type == EH_COMPACT_OUTLINE_DONE)
2267 cfi_emit_eh_header (fde->eh_loc, addend);
2275 struct cie_entry *cie, *cie_next;
2276 segT cfi_seg, ccseg;
2277 struct fde_entry *fde;
2278 struct cfi_insn_data *first;
2279 int save_flag_traditional_format, seek_next_seg;
2281 if (all_fde_data == 0)
2284 cfi_sections_set = TRUE;
2285 if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0
2286 || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
2288 /* Make sure check_eh_frame doesn't do anything with our output. */
2289 save_flag_traditional_format = flag_traditional_format;
2290 flag_traditional_format = 1;
2292 if (!EH_FRAME_LINKONCE)
2294 /* Open .eh_frame section. */
2295 cfi_seg = get_cfi_seg (NULL, ".eh_frame",
2296 (SEC_ALLOC | SEC_LOAD | SEC_DATA
2297 | DWARF2_EH_FRAME_READ_ONLY),
2298 EH_FRAME_ALIGNMENT);
2299 #ifdef md_fix_up_eh_frame
2300 md_fix_up_eh_frame (cfi_seg);
2311 for (cie = cie_root; cie; cie = cie_next)
2313 cie_next = cie->next;
2314 free ((void *) cie);
2318 for (fde = all_fde_data; fde ; fde = fde->next)
2320 if ((fde->sections & CFI_EMIT_eh_frame) == 0
2321 && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2324 #if SUPPORT_COMPACT_EH
2325 /* Emit a LEGACY format header if we have processed all
2326 of the .cfi directives without encountering either inline or
2327 out-of-line compact unwinding opcodes. */
2328 if (fde->eh_header_type == EH_COMPACT_HAS_LSDA
2329 || fde->eh_header_type == EH_COMPACT_UNKNOWN)
2330 fde->eh_header_type = EH_COMPACT_LEGACY;
2332 if (fde->eh_header_type != EH_COMPACT_LEGACY)
2335 if (EH_FRAME_LINKONCE)
2339 if (seek_next_seg && CUR_SEG (fde) != ccseg)
2346 ccseg = CUR_SEG (fde);
2347 /* Open .eh_frame section. */
2348 cfi_seg = get_cfi_seg (ccseg, ".eh_frame",
2349 (SEC_ALLOC | SEC_LOAD | SEC_DATA
2350 | DWARF2_EH_FRAME_READ_ONLY),
2351 EH_FRAME_ALIGNMENT);
2352 #ifdef md_fix_up_eh_frame
2353 md_fix_up_eh_frame (cfi_seg);
2359 SET_HANDLED (fde, 1);
2362 if (fde->end_address == NULL)
2364 as_bad (_("open CFI at the end of file; "
2365 "missing .cfi_endproc directive"));
2366 fde->end_address = fde->start_address;
2369 cie = select_cie_for_fde (fde, TRUE, &first, 2);
2370 fde->eh_loc = symbol_temp_new_now ();
2371 output_fde (fde, cie, TRUE, first,
2372 fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
2375 while (EH_FRAME_LINKONCE && seek_next_seg == 2);
2377 if (EH_FRAME_LINKONCE)
2378 for (fde = all_fde_data; fde ; fde = fde->next)
2379 SET_HANDLED (fde, 0);
2381 #if SUPPORT_COMPACT_EH
2384 /* Create remaining out of line table entries. */
2390 for (fde = all_fde_data; fde ; fde = fde->next)
2392 if ((fde->sections & CFI_EMIT_eh_frame) == 0
2393 && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2396 if (fde->eh_header_type != EH_COMPACT_OUTLINE)
2400 if (seek_next_seg && CUR_SEG (fde) != ccseg)
2407 ccseg = CUR_SEG (fde);
2408 /* Open .gnu_extab section. */
2409 get_cfi_seg (ccseg, ".gnu_extab",
2410 (SEC_ALLOC | SEC_LOAD | SEC_DATA
2411 | DWARF2_EH_FRAME_READ_ONLY),
2415 SET_HANDLED (fde, 1);
2417 frag_align (1, 0, 0);
2418 record_alignment (now_seg, 1);
2419 output_compact_unwind_data (fde, 1);
2422 while (EH_FRAME_LINKONCE && seek_next_seg == 2);
2424 for (fde = all_fde_data; fde ; fde = fde->next)
2425 SET_HANDLED (fde, 0);
2427 /* Create index table fragments. */
2433 for (fde = all_fde_data; fde ; fde = fde->next)
2435 if ((fde->sections & CFI_EMIT_eh_frame) == 0
2436 && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2441 if (seek_next_seg && CUR_SEG (fde) != ccseg)
2448 ccseg = CUR_SEG (fde);
2449 /* Open .eh_frame_entry section. */
2450 cfi_seg = get_cfi_seg (ccseg, ".eh_frame_entry",
2451 (SEC_ALLOC | SEC_LOAD | SEC_DATA
2452 | DWARF2_EH_FRAME_READ_ONLY),
2456 SET_HANDLED (fde, 1);
2458 output_eh_header (fde);
2461 while (seek_next_seg == 2);
2463 for (fde = all_fde_data; fde ; fde = fde->next)
2464 SET_HANDLED (fde, 0);
2466 #endif /* SUPPORT_COMPACT_EH */
2468 flag_traditional_format = save_flag_traditional_format;
2471 cfi_sections_set = TRUE;
2472 if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0)
2474 int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1;
2476 if (!SUPPORT_FRAME_LINKONCE)
2477 get_cfi_seg (NULL, ".debug_frame",
2478 SEC_READONLY | SEC_DEBUGGING,
2486 for (cie = cie_root; cie; cie = cie_next)
2488 cie_next = cie->next;
2489 free ((void *) cie);
2493 for (fde = all_fde_data; fde ; fde = fde->next)
2495 if ((fde->sections & CFI_EMIT_debug_frame) == 0)
2498 if (SUPPORT_FRAME_LINKONCE)
2502 if (seek_next_seg && CUR_SEG (fde) != ccseg)
2509 ccseg = CUR_SEG (fde);
2510 /* Open .debug_frame section. */
2511 get_cfi_seg (ccseg, ".debug_frame",
2512 SEC_READONLY | SEC_DEBUGGING,
2516 SET_HANDLED (fde, 1);
2518 if (fde->end_address == NULL)
2520 as_bad (_("open CFI at the end of file; "
2521 "missing .cfi_endproc directive"));
2522 fde->end_address = fde->start_address;
2525 fde->per_encoding = DW_EH_PE_omit;
2526 fde->lsda_encoding = DW_EH_PE_omit;
2527 cfi_change_reg_numbers (fde->data, ccseg);
2528 cie = select_cie_for_fde (fde, FALSE, &first, alignment);
2529 output_fde (fde, cie, FALSE, first, alignment);
2532 while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2);
2534 if (SUPPORT_FRAME_LINKONCE)
2535 for (fde = all_fde_data; fde ; fde = fde->next)
2536 SET_HANDLED (fde, 0);
2540 #else /* TARGET_USE_CFIPOP */
2542 /* Emit an intelligible error message for missing support. */
2545 dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED)
2547 as_bad (_("CFI is not supported for this target"));
2548 ignore_rest_of_line ();
2551 const pseudo_typeS cfi_pseudo_table[] =
2553 { "cfi_sections", dot_cfi_dummy, 0 },
2554 { "cfi_startproc", dot_cfi_dummy, 0 },
2555 { "cfi_endproc", dot_cfi_dummy, 0 },
2556 { "cfi_fde_data", dot_cfi_dummy, 0 },
2557 { "cfi_def_cfa", dot_cfi_dummy, 0 },
2558 { "cfi_def_cfa_register", dot_cfi_dummy, 0 },
2559 { "cfi_def_cfa_offset", dot_cfi_dummy, 0 },
2560 { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 },
2561 { "cfi_offset", dot_cfi_dummy, 0 },
2562 { "cfi_rel_offset", dot_cfi_dummy, 0 },
2563 { "cfi_register", dot_cfi_dummy, 0 },
2564 { "cfi_return_column", dot_cfi_dummy, 0 },
2565 { "cfi_restore", dot_cfi_dummy, 0 },
2566 { "cfi_undefined", dot_cfi_dummy, 0 },
2567 { "cfi_same_value", dot_cfi_dummy, 0 },
2568 { "cfi_remember_state", dot_cfi_dummy, 0 },
2569 { "cfi_restore_state", dot_cfi_dummy, 0 },
2570 { "cfi_window_save", dot_cfi_dummy, 0 },
2571 { "cfi_escape", dot_cfi_dummy, 0 },
2572 { "cfi_signal_frame", dot_cfi_dummy, 0 },
2573 { "cfi_personality", dot_cfi_dummy, 0 },
2574 { "cfi_personality_id", dot_cfi_dummy, 0 },
2575 { "cfi_lsda", dot_cfi_dummy, 0 },
2576 { "cfi_val_encoded_addr", dot_cfi_dummy, 0 },
2577 { "cfi_label", dot_cfi_dummy, 0 },
2578 { "cfi_inline_lsda", dot_cfi_dummy, 0 },
2579 { "cfi_val_offset", dot_cfi_dummy, 0 },
2587 #endif /* TARGET_USE_CFIPOP */