1 /* dw2gencfi.c - Support for generating Dwarf2 CFI information.
2 Copyright 2003, 2004, 2005, 2006, 2007 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"
26 #ifdef TARGET_USE_CFIPOP
28 /* By default, use difference expressions if DIFF_EXPR_OK is defined. */
29 #ifndef CFI_DIFF_EXPR_OK
31 # define CFI_DIFF_EXPR_OK 1
33 # define CFI_DIFF_EXPR_OK 0
37 /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
38 of the CIE. Default to 1 if not otherwise specified. */
39 #ifndef DWARF2_LINE_MIN_INSN_LENGTH
40 # define DWARF2_LINE_MIN_INSN_LENGTH 1
43 /* By default, use 32-bit relocations from .eh_frame into .text. */
44 #ifndef DWARF2_FDE_RELOC_SIZE
45 # define DWARF2_FDE_RELOC_SIZE 4
48 /* By default, use a read-only .eh_frame section. */
49 #ifndef DWARF2_EH_FRAME_READ_ONLY
50 # define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY
53 #ifndef EH_FRAME_ALIGNMENT
54 # define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
57 #ifndef tc_cfi_frame_initial_instructions
58 # define tc_cfi_frame_initial_instructions() ((void)0)
64 struct cfi_insn_data *next;
85 struct cfi_escape_data {
86 struct cfi_escape_data *next;
94 struct fde_entry *next;
95 symbolS *start_address;
97 struct cfi_insn_data *data;
98 struct cfi_insn_data **last;
99 unsigned char per_encoding;
100 unsigned char lsda_encoding;
101 expressionS personality;
103 unsigned int return_column;
104 unsigned int signal_frame;
109 struct cie_entry *next;
110 symbolS *start_address;
111 unsigned int return_column;
112 unsigned int signal_frame;
113 unsigned char per_encoding;
114 unsigned char lsda_encoding;
115 expressionS personality;
116 struct cfi_insn_data *first, *last;
120 /* List of FDE entries. */
121 static struct fde_entry *all_fde_data;
122 static struct fde_entry **last_fde_data = &all_fde_data;
124 /* List of CIEs so that they could be reused. */
125 static struct cie_entry *cie_root;
127 /* Stack of old CFI data, for save/restore. */
130 struct cfa_save_data *next;
134 /* Current open FDE entry. */
137 struct fde_entry *cur_fde_data;
138 symbolS *last_address;
139 offsetT cur_cfa_offset;
140 struct cfa_save_data *cfa_save_stack;
143 /* Construct a new FDE structure and add it to the end of the fde list. */
145 static struct fde_entry *
146 alloc_fde_entry (void)
148 struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry));
150 frchain_now->frch_cfi_data = xcalloc (1, sizeof (struct frch_cfi_data));
151 frchain_now->frch_cfi_data->cur_fde_data = fde;
152 *last_fde_data = fde;
153 last_fde_data = &fde->next;
155 fde->last = &fde->data;
156 fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
157 fde->per_encoding = DW_EH_PE_omit;
158 fde->lsda_encoding = DW_EH_PE_omit;
163 /* The following functions are available for a backend to construct its
164 own unwind information, usually from legacy unwind directives. */
166 /* Construct a new INSN structure and add it to the end of the insn list
167 for the currently active FDE. */
169 static struct cfi_insn_data *
170 alloc_cfi_insn_data (void)
172 struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data));
173 struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data;
175 *cur_fde_data->last = insn;
176 cur_fde_data->last = &insn->next;
181 /* Construct a new FDE structure that begins at LABEL. */
184 cfi_new_fde (symbolS *label)
186 struct fde_entry *fde = alloc_fde_entry ();
187 fde->start_address = label;
188 frchain_now->frch_cfi_data->last_address = label;
191 /* End the currently open FDE. */
194 cfi_end_fde (symbolS *label)
196 frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
197 free (frchain_now->frch_cfi_data);
198 frchain_now->frch_cfi_data = NULL;
201 /* Set the return column for the current FDE. */
204 cfi_set_return_column (unsigned regno)
206 frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
209 /* Universal functions to store new instructions. */
212 cfi_add_CFA_insn(int insn)
214 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
216 insn_ptr->insn = insn;
220 cfi_add_CFA_insn_reg (int insn, unsigned regno)
222 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
224 insn_ptr->insn = insn;
225 insn_ptr->u.r = regno;
229 cfi_add_CFA_insn_offset (int insn, offsetT offset)
231 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
233 insn_ptr->insn = insn;
234 insn_ptr->u.i = offset;
238 cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2)
240 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
242 insn_ptr->insn = insn;
243 insn_ptr->u.rr.reg1 = reg1;
244 insn_ptr->u.rr.reg2 = reg2;
248 cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset)
250 struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
252 insn_ptr->insn = insn;
253 insn_ptr->u.ri.reg = regno;
254 insn_ptr->u.ri.offset = offset;
257 /* Add a CFI insn to advance the PC from the last address to LABEL. */
260 cfi_add_advance_loc (symbolS *label)
262 struct cfi_insn_data *insn = alloc_cfi_insn_data ();
264 insn->insn = DW_CFA_advance_loc;
265 insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
266 insn->u.ll.lab2 = label;
268 frchain_now->frch_cfi_data->last_address = label;
271 /* Add a DW_CFA_offset record to the CFI data. */
274 cfi_add_CFA_offset (unsigned regno, offsetT offset)
276 unsigned int abs_data_align;
278 assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
279 cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset);
281 abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
282 ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
283 if (offset % abs_data_align)
284 as_bad (_("register save offset not a multiple of %u"), abs_data_align);
287 /* Add a DW_CFA_def_cfa record to the CFI data. */
290 cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
292 cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
293 frchain_now->frch_cfi_data->cur_cfa_offset = offset;
296 /* Add a DW_CFA_register record to the CFI data. */
299 cfi_add_CFA_register (unsigned reg1, unsigned reg2)
301 cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2);
304 /* Add a DW_CFA_def_cfa_register record to the CFI data. */
307 cfi_add_CFA_def_cfa_register (unsigned regno)
309 cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno);
312 /* Add a DW_CFA_def_cfa_offset record to the CFI data. */
315 cfi_add_CFA_def_cfa_offset (offsetT offset)
317 cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
318 frchain_now->frch_cfi_data->cur_cfa_offset = offset;
322 cfi_add_CFA_restore (unsigned regno)
324 cfi_add_CFA_insn_reg (DW_CFA_restore, regno);
328 cfi_add_CFA_undefined (unsigned regno)
330 cfi_add_CFA_insn_reg (DW_CFA_undefined, regno);
334 cfi_add_CFA_same_value (unsigned regno)
336 cfi_add_CFA_insn_reg (DW_CFA_same_value, regno);
340 cfi_add_CFA_remember_state (void)
342 struct cfa_save_data *p;
344 cfi_add_CFA_insn (DW_CFA_remember_state);
346 p = xmalloc (sizeof (*p));
347 p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset;
348 p->next = frchain_now->frch_cfi_data->cfa_save_stack;
349 frchain_now->frch_cfi_data->cfa_save_stack = p;
353 cfi_add_CFA_restore_state (void)
355 struct cfa_save_data *p;
357 cfi_add_CFA_insn (DW_CFA_restore_state);
359 p = frchain_now->frch_cfi_data->cfa_save_stack;
362 frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset;
363 frchain_now->frch_cfi_data->cfa_save_stack = p->next;
367 as_bad (_("CFI state restore without previous remember"));
371 /* Parse CFI assembler directives. */
373 static void dot_cfi (int);
374 static void dot_cfi_escape (int);
375 static void dot_cfi_startproc (int);
376 static void dot_cfi_endproc (int);
377 static void dot_cfi_personality (int);
378 static void dot_cfi_lsda (int);
380 /* Fake CFI type; outside the byte range of any real CFI insn. */
381 #define CFI_adjust_cfa_offset 0x100
382 #define CFI_return_column 0x101
383 #define CFI_rel_offset 0x102
384 #define CFI_escape 0x103
385 #define CFI_signal_frame 0x104
387 const pseudo_typeS cfi_pseudo_table[] =
389 { "cfi_startproc", dot_cfi_startproc, 0 },
390 { "cfi_endproc", dot_cfi_endproc, 0 },
391 { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa },
392 { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register },
393 { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset },
394 { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
395 { "cfi_offset", dot_cfi, DW_CFA_offset },
396 { "cfi_rel_offset", dot_cfi, CFI_rel_offset },
397 { "cfi_register", dot_cfi, DW_CFA_register },
398 { "cfi_return_column", dot_cfi, CFI_return_column },
399 { "cfi_restore", dot_cfi, DW_CFA_restore },
400 { "cfi_undefined", dot_cfi, DW_CFA_undefined },
401 { "cfi_same_value", dot_cfi, DW_CFA_same_value },
402 { "cfi_remember_state", dot_cfi, DW_CFA_remember_state },
403 { "cfi_restore_state", dot_cfi, DW_CFA_restore_state },
404 { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save },
405 { "cfi_escape", dot_cfi_escape, 0 },
406 { "cfi_signal_frame", dot_cfi, CFI_signal_frame },
407 { "cfi_personality", dot_cfi_personality, 0 },
408 { "cfi_lsda", dot_cfi_lsda, 0 },
413 cfi_parse_separator (void)
416 if (*input_line_pointer == ',')
417 input_line_pointer++;
419 as_bad (_("missing separator"));
422 #ifndef tc_parse_to_dw2regnum
424 tc_parse_to_dw2regnum(expressionS *exp)
426 # ifdef tc_regname_to_dw2regnum
428 if (is_name_beginner (*input_line_pointer)
429 || (*input_line_pointer == '%'
430 && is_name_beginner (*++input_line_pointer)))
434 name = input_line_pointer;
435 c = get_symbol_end ();
437 exp->X_op = O_constant;
438 exp->X_add_number = tc_regname_to_dw2regnum (name);
440 *input_line_pointer = c;
444 expression_and_evaluate (exp);
454 tc_parse_to_dw2regnum (&exp);
459 regno = exp.X_add_number;
469 as_bad (_("bad register expression"));
477 cfi_parse_const (void)
479 return get_absolute_expression ();
488 if (frchain_now->frch_cfi_data == NULL)
490 as_bad (_("CFI instruction used without previous .cfi_startproc"));
491 ignore_rest_of_line ();
495 /* If the last address was not at the current PC, advance to current. */
496 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
497 || S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
499 cfi_add_advance_loc (symbol_temp_new_now ());
504 reg1 = cfi_parse_reg ();
505 cfi_parse_separator ();
506 offset = cfi_parse_const ();
507 cfi_add_CFA_offset (reg1, offset);
511 reg1 = cfi_parse_reg ();
512 cfi_parse_separator ();
513 offset = cfi_parse_const ();
514 cfi_add_CFA_offset (reg1,
515 offset - frchain_now->frch_cfi_data->cur_cfa_offset);
519 reg1 = cfi_parse_reg ();
520 cfi_parse_separator ();
521 offset = cfi_parse_const ();
522 cfi_add_CFA_def_cfa (reg1, offset);
525 case DW_CFA_register:
526 reg1 = cfi_parse_reg ();
527 cfi_parse_separator ();
528 reg2 = cfi_parse_reg ();
529 cfi_add_CFA_register (reg1, reg2);
532 case DW_CFA_def_cfa_register:
533 reg1 = cfi_parse_reg ();
534 cfi_add_CFA_def_cfa_register (reg1);
537 case DW_CFA_def_cfa_offset:
538 offset = cfi_parse_const ();
539 cfi_add_CFA_def_cfa_offset (offset);
542 case CFI_adjust_cfa_offset:
543 offset = cfi_parse_const ();
544 cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
551 reg1 = cfi_parse_reg ();
552 cfi_add_CFA_restore (reg1);
554 if (*input_line_pointer != ',')
556 ++input_line_pointer;
560 case DW_CFA_undefined:
563 reg1 = cfi_parse_reg ();
564 cfi_add_CFA_undefined (reg1);
566 if (*input_line_pointer != ',')
568 ++input_line_pointer;
572 case DW_CFA_same_value:
573 reg1 = cfi_parse_reg ();
574 cfi_add_CFA_same_value (reg1);
577 case CFI_return_column:
578 reg1 = cfi_parse_reg ();
579 cfi_set_return_column (reg1);
582 case DW_CFA_remember_state:
583 cfi_add_CFA_remember_state ();
586 case DW_CFA_restore_state:
587 cfi_add_CFA_restore_state ();
590 case DW_CFA_GNU_window_save:
591 cfi_add_CFA_insn (DW_CFA_GNU_window_save);
594 case CFI_signal_frame:
595 frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
602 demand_empty_rest_of_line ();
606 dot_cfi_escape (int ignored ATTRIBUTE_UNUSED)
608 struct cfi_escape_data *head, **tail, *e;
609 struct cfi_insn_data *insn;
611 if (frchain_now->frch_cfi_data == NULL)
613 as_bad (_("CFI instruction used without previous .cfi_startproc"));
614 ignore_rest_of_line ();
618 /* If the last address was not at the current PC, advance to current. */
619 if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
620 || S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
622 cfi_add_advance_loc (symbol_temp_new_now ());
627 e = xmalloc (sizeof (*e));
628 do_parse_cons_expression (&e->exp, 1);
632 while (*input_line_pointer++ == ',');
635 insn = alloc_cfi_insn_data ();
636 insn->insn = CFI_escape;
639 --input_line_pointer;
640 demand_empty_rest_of_line ();
644 dot_cfi_personality (int ignored ATTRIBUTE_UNUSED)
646 struct fde_entry *fde;
649 if (frchain_now->frch_cfi_data == NULL)
651 as_bad (_("CFI instruction used without previous .cfi_startproc"));
652 ignore_rest_of_line ();
656 fde = frchain_now->frch_cfi_data->cur_fde_data;
657 encoding = get_absolute_expression ();
658 if (encoding == DW_EH_PE_omit)
660 demand_empty_rest_of_line ();
661 fde->per_encoding = encoding;
665 if ((encoding & 0xff) != encoding
666 || ((encoding & 0x70) != 0
667 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
668 && (encoding & 0x70) != DW_EH_PE_pcrel
671 /* leb128 can be handled, but does something actually need it? */
672 || (encoding & 7) == DW_EH_PE_uleb128
673 || (encoding & 7) > DW_EH_PE_udata8)
675 as_bad (_("invalid or unsupported encoding in .cfi_personality"));
676 ignore_rest_of_line ();
680 if (*input_line_pointer++ != ',')
682 as_bad (_(".cfi_personality requires encoding and symbol arguments"));
683 ignore_rest_of_line ();
687 expression_and_evaluate (&fde->personality);
688 switch (fde->personality.X_op)
693 if ((encoding & 0x70) == DW_EH_PE_pcrel)
694 encoding = DW_EH_PE_omit;
697 encoding = DW_EH_PE_omit;
701 fde->per_encoding = encoding;
703 if (encoding == DW_EH_PE_omit)
705 as_bad (_("wrong second argument to .cfi_personality"));
706 ignore_rest_of_line ();
710 demand_empty_rest_of_line ();
714 dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED)
716 struct fde_entry *fde;
719 if (frchain_now->frch_cfi_data == NULL)
721 as_bad (_("CFI instruction used without previous .cfi_startproc"));
722 ignore_rest_of_line ();
726 fde = frchain_now->frch_cfi_data->cur_fde_data;
727 encoding = get_absolute_expression ();
728 if (encoding == DW_EH_PE_omit)
730 demand_empty_rest_of_line ();
731 fde->lsda_encoding = encoding;
735 if ((encoding & 0xff) != encoding
736 || ((encoding & 0x70) != 0
737 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
738 && (encoding & 0x70) != DW_EH_PE_pcrel
741 /* leb128 can be handled, but does something actually need it? */
742 || (encoding & 7) == DW_EH_PE_uleb128
743 || (encoding & 7) > DW_EH_PE_udata8)
745 as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
746 ignore_rest_of_line ();
750 if (*input_line_pointer++ != ',')
752 as_bad (_(".cfi_lsda requires encoding and symbol arguments"));
753 ignore_rest_of_line ();
757 fde->lsda_encoding = encoding;
759 expression_and_evaluate (&fde->lsda);
760 switch (fde->lsda.X_op)
765 if ((encoding & 0x70) == DW_EH_PE_pcrel)
766 encoding = DW_EH_PE_omit;
769 encoding = DW_EH_PE_omit;
773 fde->lsda_encoding = encoding;
775 if (encoding == DW_EH_PE_omit)
777 as_bad (_("wrong second argument to .cfi_lsda"));
778 ignore_rest_of_line ();
782 demand_empty_rest_of_line ();
786 dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED)
790 if (frchain_now->frch_cfi_data != NULL)
792 as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
793 ignore_rest_of_line ();
797 cfi_new_fde (symbol_temp_new_now ());
800 if (is_name_beginner (*input_line_pointer))
804 name = input_line_pointer;
805 c = get_symbol_end ();
807 if (strcmp (name, "simple") == 0)
810 *input_line_pointer = c;
813 input_line_pointer = name;
815 demand_empty_rest_of_line ();
817 frchain_now->frch_cfi_data->cur_cfa_offset = 0;
819 tc_cfi_frame_initial_instructions ();
823 dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
825 if (frchain_now->frch_cfi_data == NULL)
827 as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
828 ignore_rest_of_line ();
832 cfi_end_fde (symbol_temp_new_now ());
834 demand_empty_rest_of_line ();
838 /* Emit a single byte into the current segment. */
843 FRAG_APPEND_1_CHAR (byte);
846 /* Emit a two-byte word into the current segment. */
851 md_number_to_chars (frag_more (2), data, 2);
854 /* Emit a four byte word into the current segment. */
859 md_number_to_chars (frag_more (4), data, 4);
862 /* Emit an unsigned "little-endian base 128" number. */
865 out_uleb128 (addressT value)
867 output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
870 /* Emit an unsigned "little-endian base 128" number. */
873 out_sleb128 (offsetT value)
875 output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
879 output_cfi_insn (struct cfi_insn_data *insn)
886 case DW_CFA_advance_loc:
888 symbolS *from = insn->u.ll.lab1;
889 symbolS *to = insn->u.ll.lab2;
891 if (symbol_get_frag (to) == symbol_get_frag (from))
893 addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
894 addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
897 out_one (DW_CFA_advance_loc + scaled);
898 else if (delta <= 0xFF)
900 out_one (DW_CFA_advance_loc1);
903 else if (delta <= 0xFFFF)
905 out_one (DW_CFA_advance_loc2);
910 out_one (DW_CFA_advance_loc4);
918 exp.X_op = O_subtract;
919 exp.X_add_symbol = to;
920 exp.X_op_symbol = from;
921 exp.X_add_number = 0;
923 /* The code in ehopt.c expects that one byte of the encoding
924 is already allocated to the frag. This comes from the way
925 that it scans the .eh_frame section looking first for the
926 .byte DW_CFA_advance_loc4. */
929 frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
930 make_expr_symbol (&exp), frag_now_fix () - 1,
937 offset = insn->u.ri.offset;
940 out_one (DW_CFA_def_cfa_sf);
941 out_uleb128 (insn->u.ri.reg);
942 out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
946 out_one (DW_CFA_def_cfa);
947 out_uleb128 (insn->u.ri.reg);
948 out_uleb128 (offset);
952 case DW_CFA_def_cfa_register:
953 case DW_CFA_undefined:
954 case DW_CFA_same_value:
955 out_one (insn->insn);
956 out_uleb128 (insn->u.r);
959 case DW_CFA_def_cfa_offset:
963 out_one (DW_CFA_def_cfa_offset_sf);
964 out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
968 out_one (DW_CFA_def_cfa_offset);
969 out_uleb128 (offset);
977 out_one (DW_CFA_restore + regno);
981 out_one (DW_CFA_restore_extended);
987 regno = insn->u.ri.reg;
988 offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
991 out_one (DW_CFA_offset_extended_sf);
993 out_sleb128 (offset);
995 else if (regno <= 0x3F)
997 out_one (DW_CFA_offset + regno);
998 out_uleb128 (offset);
1002 out_one (DW_CFA_offset_extended);
1003 out_uleb128 (regno);
1004 out_uleb128 (offset);
1008 case DW_CFA_register:
1009 out_one (DW_CFA_register);
1010 out_uleb128 (insn->u.rr.reg1);
1011 out_uleb128 (insn->u.rr.reg2);
1014 case DW_CFA_remember_state:
1015 case DW_CFA_restore_state:
1016 out_one (insn->insn);
1019 case DW_CFA_GNU_window_save:
1020 out_one (DW_CFA_GNU_window_save);
1025 struct cfi_escape_data *e;
1026 for (e = insn->u.esc; e ; e = e->next)
1027 emit_expr (&e->exp, 1);
1037 encoding_size (unsigned char encoding)
1039 if (encoding == DW_EH_PE_omit)
1041 switch (encoding & 0x7)
1044 return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4;
1045 case DW_EH_PE_udata2:
1047 case DW_EH_PE_udata4:
1049 case DW_EH_PE_udata8:
1057 output_cie (struct cie_entry *cie)
1059 symbolS *after_size_address, *end_address;
1061 struct cfi_insn_data *i;
1062 offsetT augmentation_size;
1065 cie->start_address = symbol_temp_new_now ();
1066 after_size_address = symbol_temp_make ();
1067 end_address = symbol_temp_make ();
1069 exp.X_op = O_subtract;
1070 exp.X_add_symbol = end_address;
1071 exp.X_op_symbol = after_size_address;
1072 exp.X_add_number = 0;
1074 emit_expr (&exp, 4); /* Length. */
1075 symbol_set_value_now (after_size_address);
1076 out_four (0); /* CIE id. */
1077 out_one (DW_CIE_VERSION); /* Version. */
1078 out_one ('z'); /* Augmentation. */
1079 if (cie->per_encoding != DW_EH_PE_omit)
1081 if (cie->lsda_encoding != DW_EH_PE_omit)
1084 if (cie->signal_frame)
1087 out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */
1088 out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */
1089 if (DW_CIE_VERSION == 1) /* Return column. */
1090 out_one (cie->return_column);
1092 out_uleb128 (cie->return_column);
1093 augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit);
1094 if (cie->per_encoding != DW_EH_PE_omit)
1095 augmentation_size += 1 + encoding_size (cie->per_encoding);
1096 out_uleb128 (augmentation_size); /* Augmentation size. */
1097 if (cie->per_encoding != DW_EH_PE_omit)
1099 offsetT size = encoding_size (cie->per_encoding);
1100 out_one (cie->per_encoding);
1101 exp = cie->personality;
1102 if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel)
1104 #if CFI_DIFF_EXPR_OK
1105 exp.X_op = O_subtract;
1106 exp.X_op_symbol = symbol_temp_new_now ();
1107 emit_expr (&exp, size);
1108 #elif defined (tc_cfi_emit_pcrel_expr)
1109 tc_cfi_emit_pcrel_expr (&exp, size);
1115 emit_expr (&exp, size);
1117 if (cie->lsda_encoding != DW_EH_PE_omit)
1118 out_one (cie->lsda_encoding);
1120 switch (DWARF2_FDE_RELOC_SIZE)
1123 enc = DW_EH_PE_sdata2;
1126 enc = DW_EH_PE_sdata4;
1129 enc = DW_EH_PE_sdata8;
1134 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1135 enc |= DW_EH_PE_pcrel;
1140 for (i = cie->first; i != cie->last; i = i->next)
1141 output_cfi_insn (i);
1143 frag_align (2, DW_CFA_nop, 0);
1144 symbol_set_value_now (end_address);
1148 output_fde (struct fde_entry *fde, struct cie_entry *cie,
1149 struct cfi_insn_data *first, int align)
1151 symbolS *after_size_address, *end_address;
1153 offsetT augmentation_size;
1155 after_size_address = symbol_temp_make ();
1156 end_address = symbol_temp_make ();
1158 exp.X_op = O_subtract;
1159 exp.X_add_symbol = end_address;
1160 exp.X_op_symbol = after_size_address;
1161 exp.X_add_number = 0;
1162 emit_expr (&exp, 4); /* Length. */
1163 symbol_set_value_now (after_size_address);
1165 exp.X_add_symbol = after_size_address;
1166 exp.X_op_symbol = cie->start_address;
1167 emit_expr (&exp, 4); /* CIE offset. */
1169 #if CFI_DIFF_EXPR_OK
1170 exp.X_add_symbol = fde->start_address;
1171 exp.X_op_symbol = symbol_temp_new_now ();
1172 emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
1174 exp.X_op = O_symbol;
1175 exp.X_add_symbol = fde->start_address;
1176 exp.X_op_symbol = NULL;
1177 #ifdef tc_cfi_emit_pcrel_expr
1178 tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
1180 emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
1182 exp.X_op = O_subtract;
1185 exp.X_add_symbol = fde->end_address;
1186 exp.X_op_symbol = fde->start_address; /* Code length. */
1187 emit_expr (&exp, DWARF2_FDE_RELOC_SIZE);
1189 augmentation_size = encoding_size (fde->lsda_encoding);
1190 out_uleb128 (augmentation_size); /* Augmentation size. */
1192 if (fde->lsda_encoding != DW_EH_PE_omit)
1195 if ((fde->lsda_encoding & 0x70) == DW_EH_PE_pcrel)
1197 #if CFI_DIFF_EXPR_OK
1198 exp.X_op = O_subtract;
1199 exp.X_op_symbol = symbol_temp_new_now ();
1200 emit_expr (&exp, augmentation_size);
1201 #elif defined (tc_cfi_emit_pcrel_expr)
1202 tc_cfi_emit_pcrel_expr (&exp, augmentation_size);
1208 emit_expr (&exp, augmentation_size);
1211 for (; first; first = first->next)
1212 output_cfi_insn (first);
1214 frag_align (align, DW_CFA_nop, 0);
1215 symbol_set_value_now (end_address);
1218 static struct cie_entry *
1219 select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst)
1221 struct cfi_insn_data *i, *j;
1222 struct cie_entry *cie;
1224 for (cie = cie_root; cie; cie = cie->next)
1226 if (cie->return_column != fde->return_column
1227 || cie->signal_frame != fde->signal_frame
1228 || cie->per_encoding != fde->per_encoding
1229 || cie->lsda_encoding != fde->lsda_encoding)
1231 if (cie->per_encoding != DW_EH_PE_omit)
1233 if (cie->personality.X_op != fde->personality.X_op
1234 || cie->personality.X_add_number
1235 != fde->personality.X_add_number)
1237 switch (cie->personality.X_op)
1240 if (cie->personality.X_unsigned != fde->personality.X_unsigned)
1244 if (cie->personality.X_add_symbol
1245 != fde->personality.X_add_symbol)
1252 for (i = cie->first, j = fde->data;
1253 i != cie->last && j != NULL;
1254 i = i->next, j = j->next)
1256 if (i->insn != j->insn)
1260 case DW_CFA_advance_loc:
1261 case DW_CFA_remember_state:
1262 /* We reached the first advance/remember in the FDE,
1263 but did not reach the end of the CIE list. */
1267 case DW_CFA_def_cfa:
1268 if (i->u.ri.reg != j->u.ri.reg)
1270 if (i->u.ri.offset != j->u.ri.offset)
1274 case DW_CFA_register:
1275 if (i->u.rr.reg1 != j->u.rr.reg1)
1277 if (i->u.rr.reg2 != j->u.rr.reg2)
1281 case DW_CFA_def_cfa_register:
1282 case DW_CFA_restore:
1283 case DW_CFA_undefined:
1284 case DW_CFA_same_value:
1285 if (i->u.r != j->u.r)
1289 case DW_CFA_def_cfa_offset:
1290 if (i->u.i != j->u.i)
1295 /* Don't bother matching these for now. */
1303 /* Success if we reached the end of the CIE list, and we've either
1304 run out of FDE entries or we've encountered an advance,
1305 remember, or escape. */
1308 || j->insn == DW_CFA_advance_loc
1309 || j->insn == DW_CFA_remember_state
1310 || j->insn == CFI_escape))
1319 cie = xmalloc (sizeof (struct cie_entry));
1320 cie->next = cie_root;
1322 cie->return_column = fde->return_column;
1323 cie->signal_frame = fde->signal_frame;
1324 cie->per_encoding = fde->per_encoding;
1325 cie->lsda_encoding = fde->lsda_encoding;
1326 cie->personality = fde->personality;
1327 cie->first = fde->data;
1329 for (i = cie->first; i ; i = i->next)
1330 if (i->insn == DW_CFA_advance_loc
1331 || i->insn == DW_CFA_remember_state
1332 || i->insn == CFI_escape)
1347 struct fde_entry *fde;
1348 int save_flag_traditional_format;
1350 if (all_fde_data == 0)
1353 /* Open .eh_frame section. */
1354 cfi_seg = subseg_new (".eh_frame", 0);
1355 bfd_set_section_flags (stdoutput, cfi_seg,
1356 SEC_ALLOC | SEC_LOAD | SEC_DATA
1357 | DWARF2_EH_FRAME_READ_ONLY);
1358 subseg_set (cfi_seg, 0);
1359 record_alignment (cfi_seg, EH_FRAME_ALIGNMENT);
1361 /* Make sure check_eh_frame doesn't do anything with our output. */
1362 save_flag_traditional_format = flag_traditional_format;
1363 flag_traditional_format = 1;
1365 for (fde = all_fde_data; fde ; fde = fde->next)
1367 struct cfi_insn_data *first;
1368 struct cie_entry *cie;
1370 if (fde->end_address == NULL)
1372 as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
1373 fde->end_address = fde->start_address;
1376 cie = select_cie_for_fde (fde, &first);
1377 output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
1380 flag_traditional_format = save_flag_traditional_format;
1383 #else /* TARGET_USE_CFIPOP */
1388 #endif /* TARGET_USE_CFIPOP */