forked from KolibriOS/kolibrios
2045 lines
48 KiB
C
2045 lines
48 KiB
C
/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
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Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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Free Software Foundation, Inc.
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Contributed by Michal Ludvig <mludvig@suse.cz>
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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#include "dw2gencfi.h"
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#include "subsegs.h"
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#include "dwarf2dbg.h"
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#ifdef TARGET_USE_CFIPOP
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/* By default, use difference expressions if DIFF_EXPR_OK is defined. */
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#ifndef CFI_DIFF_EXPR_OK
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# ifdef DIFF_EXPR_OK
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# define CFI_DIFF_EXPR_OK 1
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# else
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# define CFI_DIFF_EXPR_OK 0
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# endif
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#endif
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#ifndef CFI_DIFF_LSDA_OK
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#define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK
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#endif
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#if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0
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# error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK"
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#endif
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/* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
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of the CIE. Default to 1 if not otherwise specified. */
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#ifndef DWARF2_LINE_MIN_INSN_LENGTH
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#define DWARF2_LINE_MIN_INSN_LENGTH 1
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#endif
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/* By default, use 32-bit relocations from .eh_frame into .text. */
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#ifndef DWARF2_FDE_RELOC_SIZE
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#define DWARF2_FDE_RELOC_SIZE 4
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#endif
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/* By default, use a read-only .eh_frame section. */
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#ifndef DWARF2_EH_FRAME_READ_ONLY
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#define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY
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#endif
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#ifndef EH_FRAME_ALIGNMENT
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#define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
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#endif
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#ifndef tc_cfi_frame_initial_instructions
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#define tc_cfi_frame_initial_instructions() ((void)0)
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#endif
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#ifndef tc_cfi_startproc
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# define tc_cfi_startproc() ((void)0)
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#endif
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#ifndef tc_cfi_endproc
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# define tc_cfi_endproc(fde) ((void) (fde))
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#endif
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#ifndef DWARF2_FORMAT
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#define DWARF2_FORMAT(SEC) dwarf2_format_32bit
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#endif
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#ifndef DWARF2_ADDR_SIZE
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#define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
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#endif
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#if SUPPORT_FRAME_LINKONCE
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#define CUR_SEG(structp) structp->cur_seg
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#define SET_CUR_SEG(structp, seg) structp->cur_seg = seg
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#define HANDLED(structp) structp->handled
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#define SET_HANDLED(structp, val) structp->handled = val
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#else
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#define CUR_SEG(structp) NULL
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#define SET_CUR_SEG(structp, seg) (void) (0 && seg)
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#define HANDLED(structp) 0
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#define SET_HANDLED(structp, val) (void) (0 && val)
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#endif
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/* Private segment collection list. */
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struct dwcfi_seg_list
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{
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segT seg;
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int subseg;
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char * seg_name;
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};
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#define FRAME_NAME ".eh_frame"
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static struct hash_control *dwcfi_hash;
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/* Build based on segment the derived .debug_...
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segment name containing origin segment's postfix name part. */
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static char *
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get_debugseg_name (segT seg, const char *base_name)
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{
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const char *name;
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if (!seg)
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name = "";
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else
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{
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const char * dollar;
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const char * dot;
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name = bfd_get_section_name (stdoutput, seg);
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dollar = strchr (name, '$');
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dot = strchr (name + 1, '.');
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if (!dollar && !dot)
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name = "";
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else if (!dollar)
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name = dot;
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else if (!dot)
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name = dollar;
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else if (dot < dollar)
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name = dot;
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else
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name = dollar;
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}
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return concat (base_name, name, NULL);
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}
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/* Allocate a dwcfi_seg_list structure. */
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static struct dwcfi_seg_list *
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alloc_debugseg_item (segT seg, int subseg, char *name)
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{
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struct dwcfi_seg_list *r;
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r = (struct dwcfi_seg_list *)
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xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name));
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r->seg = seg;
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r->subseg = subseg;
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r->seg_name = name;
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return r;
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}
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static segT
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is_now_linkonce_segment (void)
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{
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if ((bfd_get_section_flags (stdoutput, now_seg)
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& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
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| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
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| SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0)
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return now_seg;
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return NULL;
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}
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/* Generate debug... segment with same linkonce properties
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of based segment. */
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static segT
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make_debug_seg (segT cseg, char *name, int sflags)
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{
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segT save_seg = now_seg;
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int save_subseg = now_subseg;
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segT r;
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flagword flags;
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r = subseg_new (name, 0);
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/* Check if code segment is marked as linked once. */
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if (!cseg)
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flags = 0;
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else
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flags = bfd_get_section_flags (stdoutput, cseg)
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& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
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| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
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| SEC_LINK_DUPLICATES_SAME_CONTENTS);
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/* Add standard section flags. */
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flags |= sflags;
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/* Apply possibly linked once flags to new generated segment, too. */
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if (!bfd_set_section_flags (stdoutput, r, flags))
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as_bad (_("bfd_set_section_flags: %s"),
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bfd_errmsg (bfd_get_error ()));
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/* Restore to previous segment. */
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if (save_seg != NULL)
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subseg_set (save_seg, save_subseg);
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return r;
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}
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static void
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dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item)
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{
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const char *error_string;
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if ((error_string = hash_jam (dwcfi_hash, name, (char *) item)))
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as_fatal (_("Inserting \"%s\" into structure table failed: %s"),
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name, error_string);
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}
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static struct dwcfi_seg_list *
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dwcfi_hash_find (char *name)
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{
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return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name);
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}
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static struct dwcfi_seg_list *
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dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags)
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{
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struct dwcfi_seg_list *item;
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char *name;
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/* Initialize dwcfi_hash once. */
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if (!dwcfi_hash)
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dwcfi_hash = hash_new ();
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name = get_debugseg_name (cseg, base_name);
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item = dwcfi_hash_find (name);
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if (!item)
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{
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item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name);
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dwcfi_hash_insert (item->seg_name, item);
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}
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else
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free (name);
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return item;
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}
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/* ??? Share this with dwarf2cfg.c. */
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#ifndef TC_DWARF2_EMIT_OFFSET
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#define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset
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/* Create an offset to .dwarf2_*. */
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static void
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generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size)
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{
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expressionS exp;
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exp.X_op = O_symbol;
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exp.X_add_symbol = symbol;
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exp.X_add_number = 0;
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emit_expr (&exp, size);
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}
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#endif
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struct cfi_escape_data
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{
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struct cfi_escape_data *next;
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expressionS exp;
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};
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struct cie_entry
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{
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struct cie_entry *next;
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#if SUPPORT_FRAME_LINKONCE
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segT cur_seg;
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#endif
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symbolS *start_address;
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unsigned int return_column;
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unsigned int signal_frame;
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unsigned char per_encoding;
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unsigned char lsda_encoding;
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expressionS personality;
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struct cfi_insn_data *first, *last;
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};
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/* List of FDE entries. */
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struct fde_entry *all_fde_data;
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static struct fde_entry **last_fde_data = &all_fde_data;
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/* List of CIEs so that they could be reused. */
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static struct cie_entry *cie_root;
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/* Stack of old CFI data, for save/restore. */
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struct cfa_save_data
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{
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struct cfa_save_data *next;
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offsetT cfa_offset;
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};
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/* Current open FDE entry. */
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struct frch_cfi_data
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{
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struct fde_entry *cur_fde_data;
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symbolS *last_address;
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offsetT cur_cfa_offset;
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struct cfa_save_data *cfa_save_stack;
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};
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/* Construct a new FDE structure and add it to the end of the fde list. */
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static struct fde_entry *
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alloc_fde_entry (void)
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{
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struct fde_entry *fde = (struct fde_entry *)
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xcalloc (1, sizeof (struct fde_entry));
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frchain_now->frch_cfi_data = (struct frch_cfi_data *)
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xcalloc (1, sizeof (struct frch_cfi_data));
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frchain_now->frch_cfi_data->cur_fde_data = fde;
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*last_fde_data = fde;
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last_fde_data = &fde->next;
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SET_CUR_SEG (fde, is_now_linkonce_segment ());
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SET_HANDLED (fde, 0);
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fde->last = &fde->data;
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fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
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fde->per_encoding = DW_EH_PE_omit;
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fde->lsda_encoding = DW_EH_PE_omit;
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return fde;
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}
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/* The following functions are available for a backend to construct its
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own unwind information, usually from legacy unwind directives. */
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/* Construct a new INSN structure and add it to the end of the insn list
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for the currently active FDE. */
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static struct cfi_insn_data *
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alloc_cfi_insn_data (void)
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{
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struct cfi_insn_data *insn = (struct cfi_insn_data *)
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xcalloc (1, sizeof (struct cfi_insn_data));
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struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data;
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*cur_fde_data->last = insn;
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cur_fde_data->last = &insn->next;
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SET_CUR_SEG (insn, is_now_linkonce_segment ());
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return insn;
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}
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/* Construct a new FDE structure that begins at LABEL. */
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void
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cfi_new_fde (symbolS *label)
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{
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struct fde_entry *fde = alloc_fde_entry ();
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fde->start_address = label;
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frchain_now->frch_cfi_data->last_address = label;
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}
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/* End the currently open FDE. */
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void
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cfi_end_fde (symbolS *label)
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{
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frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
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free (frchain_now->frch_cfi_data);
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frchain_now->frch_cfi_data = NULL;
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}
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/* Set the return column for the current FDE. */
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void
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cfi_set_return_column (unsigned regno)
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{
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frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
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}
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/* Universal functions to store new instructions. */
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static void
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cfi_add_CFA_insn (int insn)
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{
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struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
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insn_ptr->insn = insn;
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}
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static void
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cfi_add_CFA_insn_reg (int insn, unsigned regno)
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{
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struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
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insn_ptr->insn = insn;
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insn_ptr->u.r = regno;
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}
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static void
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cfi_add_CFA_insn_offset (int insn, offsetT offset)
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{
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struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
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insn_ptr->insn = insn;
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insn_ptr->u.i = offset;
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}
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static void
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cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2)
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{
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struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
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insn_ptr->insn = insn;
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insn_ptr->u.rr.reg1 = reg1;
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insn_ptr->u.rr.reg2 = reg2;
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}
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static void
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cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset)
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{
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struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
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insn_ptr->insn = insn;
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insn_ptr->u.ri.reg = regno;
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insn_ptr->u.ri.offset = offset;
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}
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/* Add a CFI insn to advance the PC from the last address to LABEL. */
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void
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cfi_add_advance_loc (symbolS *label)
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{
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struct cfi_insn_data *insn = alloc_cfi_insn_data ();
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insn->insn = DW_CFA_advance_loc;
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insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
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insn->u.ll.lab2 = label;
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frchain_now->frch_cfi_data->last_address = label;
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}
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/* Add a DW_CFA_offset record to the CFI data. */
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void
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cfi_add_CFA_offset (unsigned regno, offsetT offset)
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{
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unsigned int abs_data_align;
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gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
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cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset);
|
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abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
|
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? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
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if (offset % abs_data_align)
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as_bad (_("register save offset not a multiple of %u"), abs_data_align);
|
||
}
|
||
|
||
/* Add a DW_CFA_def_cfa record to the CFI data. */
|
||
|
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void
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cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
|
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{
|
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cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
|
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frchain_now->frch_cfi_data->cur_cfa_offset = offset;
|
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}
|
||
|
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/* Add a DW_CFA_register record to the CFI data. */
|
||
|
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void
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cfi_add_CFA_register (unsigned reg1, unsigned reg2)
|
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{
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cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2);
|
||
}
|
||
|
||
/* Add a DW_CFA_def_cfa_register record to the CFI data. */
|
||
|
||
void
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cfi_add_CFA_def_cfa_register (unsigned regno)
|
||
{
|
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cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno);
|
||
}
|
||
|
||
/* Add a DW_CFA_def_cfa_offset record to the CFI data. */
|
||
|
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void
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cfi_add_CFA_def_cfa_offset (offsetT offset)
|
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{
|
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cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
|
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frchain_now->frch_cfi_data->cur_cfa_offset = offset;
|
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}
|
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|
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void
|
||
cfi_add_CFA_restore (unsigned regno)
|
||
{
|
||
cfi_add_CFA_insn_reg (DW_CFA_restore, regno);
|
||
}
|
||
|
||
void
|
||
cfi_add_CFA_undefined (unsigned regno)
|
||
{
|
||
cfi_add_CFA_insn_reg (DW_CFA_undefined, regno);
|
||
}
|
||
|
||
void
|
||
cfi_add_CFA_same_value (unsigned regno)
|
||
{
|
||
cfi_add_CFA_insn_reg (DW_CFA_same_value, regno);
|
||
}
|
||
|
||
void
|
||
cfi_add_CFA_remember_state (void)
|
||
{
|
||
struct cfa_save_data *p;
|
||
|
||
cfi_add_CFA_insn (DW_CFA_remember_state);
|
||
|
||
p = (struct cfa_save_data *) xmalloc (sizeof (*p));
|
||
p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset;
|
||
p->next = frchain_now->frch_cfi_data->cfa_save_stack;
|
||
frchain_now->frch_cfi_data->cfa_save_stack = p;
|
||
}
|
||
|
||
void
|
||
cfi_add_CFA_restore_state (void)
|
||
{
|
||
struct cfa_save_data *p;
|
||
|
||
cfi_add_CFA_insn (DW_CFA_restore_state);
|
||
|
||
p = frchain_now->frch_cfi_data->cfa_save_stack;
|
||
if (p)
|
||
{
|
||
frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset;
|
||
frchain_now->frch_cfi_data->cfa_save_stack = p->next;
|
||
free (p);
|
||
}
|
||
else
|
||
as_bad (_("CFI state restore without previous remember"));
|
||
}
|
||
|
||
|
||
/* Parse CFI assembler directives. */
|
||
|
||
static void dot_cfi (int);
|
||
static void dot_cfi_escape (int);
|
||
static void dot_cfi_sections (int);
|
||
static void dot_cfi_startproc (int);
|
||
static void dot_cfi_endproc (int);
|
||
static void dot_cfi_personality (int);
|
||
static void dot_cfi_lsda (int);
|
||
static void dot_cfi_val_encoded_addr (int);
|
||
|
||
const pseudo_typeS cfi_pseudo_table[] =
|
||
{
|
||
{ "cfi_sections", dot_cfi_sections, 0 },
|
||
{ "cfi_startproc", dot_cfi_startproc, 0 },
|
||
{ "cfi_endproc", dot_cfi_endproc, 0 },
|
||
{ "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa },
|
||
{ "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register },
|
||
{ "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset },
|
||
{ "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
|
||
{ "cfi_offset", dot_cfi, DW_CFA_offset },
|
||
{ "cfi_rel_offset", dot_cfi, CFI_rel_offset },
|
||
{ "cfi_register", dot_cfi, DW_CFA_register },
|
||
{ "cfi_return_column", dot_cfi, CFI_return_column },
|
||
{ "cfi_restore", dot_cfi, DW_CFA_restore },
|
||
{ "cfi_undefined", dot_cfi, DW_CFA_undefined },
|
||
{ "cfi_same_value", dot_cfi, DW_CFA_same_value },
|
||
{ "cfi_remember_state", dot_cfi, DW_CFA_remember_state },
|
||
{ "cfi_restore_state", dot_cfi, DW_CFA_restore_state },
|
||
{ "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save },
|
||
{ "cfi_escape", dot_cfi_escape, 0 },
|
||
{ "cfi_signal_frame", dot_cfi, CFI_signal_frame },
|
||
{ "cfi_personality", dot_cfi_personality, 0 },
|
||
{ "cfi_lsda", dot_cfi_lsda, 0 },
|
||
{ "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 },
|
||
{ NULL, NULL, 0 }
|
||
};
|
||
|
||
static void
|
||
cfi_parse_separator (void)
|
||
{
|
||
SKIP_WHITESPACE ();
|
||
if (*input_line_pointer == ',')
|
||
input_line_pointer++;
|
||
else
|
||
as_bad (_("missing separator"));
|
||
}
|
||
|
||
#ifndef tc_parse_to_dw2regnum
|
||
static void
|
||
tc_parse_to_dw2regnum (expressionS *exp)
|
||
{
|
||
# ifdef tc_regname_to_dw2regnum
|
||
SKIP_WHITESPACE ();
|
||
if (is_name_beginner (*input_line_pointer)
|
||
|| (*input_line_pointer == '%'
|
||
&& is_name_beginner (*++input_line_pointer)))
|
||
{
|
||
char *name, c;
|
||
|
||
name = input_line_pointer;
|
||
c = get_symbol_end ();
|
||
|
||
exp->X_op = O_constant;
|
||
exp->X_add_number = tc_regname_to_dw2regnum (name);
|
||
|
||
*input_line_pointer = c;
|
||
}
|
||
else
|
||
# endif
|
||
expression_and_evaluate (exp);
|
||
}
|
||
#endif
|
||
|
||
static unsigned
|
||
cfi_parse_reg (void)
|
||
{
|
||
int regno;
|
||
expressionS exp;
|
||
|
||
tc_parse_to_dw2regnum (&exp);
|
||
switch (exp.X_op)
|
||
{
|
||
case O_register:
|
||
case O_constant:
|
||
regno = exp.X_add_number;
|
||
break;
|
||
|
||
default:
|
||
regno = -1;
|
||
break;
|
||
}
|
||
|
||
if (regno < 0)
|
||
{
|
||
as_bad (_("bad register expression"));
|
||
regno = 0;
|
||
}
|
||
|
||
return regno;
|
||
}
|
||
|
||
static offsetT
|
||
cfi_parse_const (void)
|
||
{
|
||
return get_absolute_expression ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi (int arg)
|
||
{
|
||
offsetT offset;
|
||
unsigned reg1, reg2;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_("CFI instruction used without previous .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
/* If the last address was not at the current PC, advance to current. */
|
||
if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
|
||
|| S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
|
||
!= frag_now_fix ())
|
||
cfi_add_advance_loc (symbol_temp_new_now ());
|
||
|
||
switch (arg)
|
||
{
|
||
case DW_CFA_offset:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_parse_separator ();
|
||
offset = cfi_parse_const ();
|
||
cfi_add_CFA_offset (reg1, offset);
|
||
break;
|
||
|
||
case CFI_rel_offset:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_parse_separator ();
|
||
offset = cfi_parse_const ();
|
||
cfi_add_CFA_offset (reg1,
|
||
offset - frchain_now->frch_cfi_data->cur_cfa_offset);
|
||
break;
|
||
|
||
case DW_CFA_def_cfa:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_parse_separator ();
|
||
offset = cfi_parse_const ();
|
||
cfi_add_CFA_def_cfa (reg1, offset);
|
||
break;
|
||
|
||
case DW_CFA_register:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_parse_separator ();
|
||
reg2 = cfi_parse_reg ();
|
||
cfi_add_CFA_register (reg1, reg2);
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_register:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_add_CFA_def_cfa_register (reg1);
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_offset:
|
||
offset = cfi_parse_const ();
|
||
cfi_add_CFA_def_cfa_offset (offset);
|
||
break;
|
||
|
||
case CFI_adjust_cfa_offset:
|
||
offset = cfi_parse_const ();
|
||
cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
|
||
+ offset);
|
||
break;
|
||
|
||
case DW_CFA_restore:
|
||
for (;;)
|
||
{
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_add_CFA_restore (reg1);
|
||
SKIP_WHITESPACE ();
|
||
if (*input_line_pointer != ',')
|
||
break;
|
||
++input_line_pointer;
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_undefined:
|
||
for (;;)
|
||
{
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_add_CFA_undefined (reg1);
|
||
SKIP_WHITESPACE ();
|
||
if (*input_line_pointer != ',')
|
||
break;
|
||
++input_line_pointer;
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_same_value:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_add_CFA_same_value (reg1);
|
||
break;
|
||
|
||
case CFI_return_column:
|
||
reg1 = cfi_parse_reg ();
|
||
cfi_set_return_column (reg1);
|
||
break;
|
||
|
||
case DW_CFA_remember_state:
|
||
cfi_add_CFA_remember_state ();
|
||
break;
|
||
|
||
case DW_CFA_restore_state:
|
||
cfi_add_CFA_restore_state ();
|
||
break;
|
||
|
||
case DW_CFA_GNU_window_save:
|
||
cfi_add_CFA_insn (DW_CFA_GNU_window_save);
|
||
break;
|
||
|
||
case CFI_signal_frame:
|
||
frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi_escape (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
struct cfi_escape_data *head, **tail, *e;
|
||
struct cfi_insn_data *insn;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_("CFI instruction used without previous .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
/* If the last address was not at the current PC, advance to current. */
|
||
if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
|
||
|| S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
|
||
!= frag_now_fix ())
|
||
cfi_add_advance_loc (symbol_temp_new_now ());
|
||
|
||
tail = &head;
|
||
do
|
||
{
|
||
e = (struct cfi_escape_data *) xmalloc (sizeof (*e));
|
||
do_parse_cons_expression (&e->exp, 1);
|
||
*tail = e;
|
||
tail = &e->next;
|
||
}
|
||
while (*input_line_pointer++ == ',');
|
||
*tail = NULL;
|
||
|
||
insn = alloc_cfi_insn_data ();
|
||
insn->insn = CFI_escape;
|
||
insn->u.esc = head;
|
||
|
||
--input_line_pointer;
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi_personality (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
struct fde_entry *fde;
|
||
offsetT encoding;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_("CFI instruction used without previous .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
fde = frchain_now->frch_cfi_data->cur_fde_data;
|
||
encoding = cfi_parse_const ();
|
||
if (encoding == DW_EH_PE_omit)
|
||
{
|
||
demand_empty_rest_of_line ();
|
||
fde->per_encoding = encoding;
|
||
return;
|
||
}
|
||
|
||
if ((encoding & 0xff) != encoding
|
||
|| ((encoding & 0x70) != 0
|
||
#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
|
||
&& (encoding & 0x70) != DW_EH_PE_pcrel
|
||
#endif
|
||
)
|
||
/* leb128 can be handled, but does something actually need it? */
|
||
|| (encoding & 7) == DW_EH_PE_uleb128
|
||
|| (encoding & 7) > DW_EH_PE_udata8)
|
||
{
|
||
as_bad (_("invalid or unsupported encoding in .cfi_personality"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
if (*input_line_pointer++ != ',')
|
||
{
|
||
as_bad (_(".cfi_personality requires encoding and symbol arguments"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
expression_and_evaluate (&fde->personality);
|
||
switch (fde->personality.X_op)
|
||
{
|
||
case O_symbol:
|
||
break;
|
||
case O_constant:
|
||
if ((encoding & 0x70) == DW_EH_PE_pcrel)
|
||
encoding = DW_EH_PE_omit;
|
||
break;
|
||
default:
|
||
encoding = DW_EH_PE_omit;
|
||
break;
|
||
}
|
||
|
||
fde->per_encoding = encoding;
|
||
|
||
if (encoding == DW_EH_PE_omit)
|
||
{
|
||
as_bad (_("wrong second argument to .cfi_personality"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
struct fde_entry *fde;
|
||
offsetT encoding;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_("CFI instruction used without previous .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
fde = frchain_now->frch_cfi_data->cur_fde_data;
|
||
encoding = cfi_parse_const ();
|
||
if (encoding == DW_EH_PE_omit)
|
||
{
|
||
demand_empty_rest_of_line ();
|
||
fde->lsda_encoding = encoding;
|
||
return;
|
||
}
|
||
|
||
if ((encoding & 0xff) != encoding
|
||
|| ((encoding & 0x70) != 0
|
||
#if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr
|
||
&& (encoding & 0x70) != DW_EH_PE_pcrel
|
||
#endif
|
||
)
|
||
/* leb128 can be handled, but does something actually need it? */
|
||
|| (encoding & 7) == DW_EH_PE_uleb128
|
||
|| (encoding & 7) > DW_EH_PE_udata8)
|
||
{
|
||
as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
if (*input_line_pointer++ != ',')
|
||
{
|
||
as_bad (_(".cfi_lsda requires encoding and symbol arguments"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
fde->lsda_encoding = encoding;
|
||
|
||
expression_and_evaluate (&fde->lsda);
|
||
switch (fde->lsda.X_op)
|
||
{
|
||
case O_symbol:
|
||
break;
|
||
case O_constant:
|
||
if ((encoding & 0x70) == DW_EH_PE_pcrel)
|
||
encoding = DW_EH_PE_omit;
|
||
break;
|
||
default:
|
||
encoding = DW_EH_PE_omit;
|
||
break;
|
||
}
|
||
|
||
fde->lsda_encoding = encoding;
|
||
|
||
if (encoding == DW_EH_PE_omit)
|
||
{
|
||
as_bad (_("wrong second argument to .cfi_lsda"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
struct cfi_insn_data *insn_ptr;
|
||
offsetT encoding;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_("CFI instruction used without previous .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
/* If the last address was not at the current PC, advance to current. */
|
||
if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
|
||
|| S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
|
||
!= frag_now_fix ())
|
||
cfi_add_advance_loc (symbol_temp_new_now ());
|
||
|
||
insn_ptr = alloc_cfi_insn_data ();
|
||
insn_ptr->insn = CFI_val_encoded_addr;
|
||
|
||
insn_ptr->u.ea.reg = cfi_parse_reg ();
|
||
|
||
cfi_parse_separator ();
|
||
encoding = cfi_parse_const ();
|
||
if ((encoding & 0xff) != encoding
|
||
|| ((encoding & 0x70) != 0
|
||
#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
|
||
&& (encoding & 0x70) != DW_EH_PE_pcrel
|
||
#endif
|
||
)
|
||
/* leb128 can be handled, but does something actually need it? */
|
||
|| (encoding & 7) == DW_EH_PE_uleb128
|
||
|| (encoding & 7) > DW_EH_PE_udata8)
|
||
{
|
||
as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
|
||
encoding = DW_EH_PE_omit;
|
||
}
|
||
|
||
cfi_parse_separator ();
|
||
expression_and_evaluate (&insn_ptr->u.ea.exp);
|
||
switch (insn_ptr->u.ea.exp.X_op)
|
||
{
|
||
case O_symbol:
|
||
break;
|
||
case O_constant:
|
||
if ((encoding & 0x70) != DW_EH_PE_pcrel)
|
||
break;
|
||
default:
|
||
encoding = DW_EH_PE_omit;
|
||
break;
|
||
}
|
||
|
||
insn_ptr->u.ea.encoding = encoding;
|
||
if (encoding == DW_EH_PE_omit)
|
||
{
|
||
as_bad (_("wrong third argument to .cfi_val_encoded_addr"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
/* By default emit .eh_frame only, not .debug_frame. */
|
||
#define CFI_EMIT_eh_frame (1 << 0)
|
||
#define CFI_EMIT_debug_frame (1 << 1)
|
||
#define CFI_EMIT_target (1 << 2)
|
||
static int cfi_sections = CFI_EMIT_eh_frame;
|
||
|
||
static void
|
||
dot_cfi_sections (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
int sections = 0;
|
||
|
||
SKIP_WHITESPACE ();
|
||
if (is_name_beginner (*input_line_pointer))
|
||
while (1)
|
||
{
|
||
char *name, c;
|
||
|
||
name = input_line_pointer;
|
||
c = get_symbol_end ();
|
||
|
||
if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0
|
||
&& name[9] != '_')
|
||
sections |= CFI_EMIT_eh_frame;
|
||
else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0)
|
||
sections |= CFI_EMIT_debug_frame;
|
||
#ifdef tc_cfi_section_name
|
||
else if (strcmp (name, tc_cfi_section_name) == 0)
|
||
sections |= CFI_EMIT_target;
|
||
#endif
|
||
else
|
||
{
|
||
*input_line_pointer = c;
|
||
input_line_pointer = name;
|
||
break;
|
||
}
|
||
|
||
*input_line_pointer = c;
|
||
SKIP_WHITESPACE ();
|
||
if (*input_line_pointer == ',')
|
||
{
|
||
name = input_line_pointer++;
|
||
SKIP_WHITESPACE ();
|
||
if (!is_name_beginner (*input_line_pointer))
|
||
{
|
||
input_line_pointer = name;
|
||
break;
|
||
}
|
||
}
|
||
else if (is_name_beginner (*input_line_pointer))
|
||
break;
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
cfi_sections = sections;
|
||
}
|
||
|
||
static void
|
||
dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
int simple = 0;
|
||
|
||
if (frchain_now->frch_cfi_data != NULL)
|
||
{
|
||
as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
cfi_new_fde (symbol_temp_new_now ());
|
||
|
||
SKIP_WHITESPACE ();
|
||
if (is_name_beginner (*input_line_pointer))
|
||
{
|
||
char *name, c;
|
||
|
||
name = input_line_pointer;
|
||
c = get_symbol_end ();
|
||
|
||
if (strcmp (name, "simple") == 0)
|
||
{
|
||
simple = 1;
|
||
*input_line_pointer = c;
|
||
}
|
||
else
|
||
input_line_pointer = name;
|
||
}
|
||
demand_empty_rest_of_line ();
|
||
|
||
frchain_now->frch_cfi_data->cur_cfa_offset = 0;
|
||
if (!simple)
|
||
tc_cfi_frame_initial_instructions ();
|
||
|
||
if ((cfi_sections & CFI_EMIT_target) != 0)
|
||
tc_cfi_startproc ();
|
||
}
|
||
|
||
static void
|
||
dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
struct fde_entry *fde;
|
||
|
||
if (frchain_now->frch_cfi_data == NULL)
|
||
{
|
||
as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
fde = frchain_now->frch_cfi_data->cur_fde_data;
|
||
|
||
cfi_end_fde (symbol_temp_new_now ());
|
||
|
||
demand_empty_rest_of_line ();
|
||
|
||
if ((cfi_sections & CFI_EMIT_target) != 0)
|
||
tc_cfi_endproc (fde);
|
||
}
|
||
|
||
|
||
/* Emit a single byte into the current segment. */
|
||
|
||
static inline void
|
||
out_one (int byte)
|
||
{
|
||
FRAG_APPEND_1_CHAR (byte);
|
||
}
|
||
|
||
/* Emit a two-byte word into the current segment. */
|
||
|
||
static inline void
|
||
out_two (int data)
|
||
{
|
||
md_number_to_chars (frag_more (2), data, 2);
|
||
}
|
||
|
||
/* Emit a four byte word into the current segment. */
|
||
|
||
static inline void
|
||
out_four (int data)
|
||
{
|
||
md_number_to_chars (frag_more (4), data, 4);
|
||
}
|
||
|
||
/* Emit an unsigned "little-endian base 128" number. */
|
||
|
||
static void
|
||
out_uleb128 (addressT value)
|
||
{
|
||
output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
|
||
}
|
||
|
||
/* Emit an unsigned "little-endian base 128" number. */
|
||
|
||
static void
|
||
out_sleb128 (offsetT value)
|
||
{
|
||
output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
|
||
}
|
||
|
||
static void
|
||
output_cfi_insn (struct cfi_insn_data *insn)
|
||
{
|
||
offsetT offset;
|
||
unsigned int regno;
|
||
|
||
switch (insn->insn)
|
||
{
|
||
case DW_CFA_advance_loc:
|
||
{
|
||
symbolS *from = insn->u.ll.lab1;
|
||
symbolS *to = insn->u.ll.lab2;
|
||
|
||
if (symbol_get_frag (to) == symbol_get_frag (from))
|
||
{
|
||
addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
|
||
addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
|
||
|
||
if (scaled <= 0x3F)
|
||
out_one (DW_CFA_advance_loc + scaled);
|
||
else if (scaled <= 0xFF)
|
||
{
|
||
out_one (DW_CFA_advance_loc1);
|
||
out_one (scaled);
|
||
}
|
||
else if (scaled <= 0xFFFF)
|
||
{
|
||
out_one (DW_CFA_advance_loc2);
|
||
out_two (scaled);
|
||
}
|
||
else
|
||
{
|
||
out_one (DW_CFA_advance_loc4);
|
||
out_four (scaled);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
expressionS exp;
|
||
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = to;
|
||
exp.X_op_symbol = from;
|
||
exp.X_add_number = 0;
|
||
|
||
/* The code in ehopt.c expects that one byte of the encoding
|
||
is already allocated to the frag. This comes from the way
|
||
that it scans the .eh_frame section looking first for the
|
||
.byte DW_CFA_advance_loc4. */
|
||
*frag_more (1) = DW_CFA_advance_loc4;
|
||
|
||
frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
|
||
make_expr_symbol (&exp), frag_now_fix () - 1,
|
||
(char *) frag_now);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_def_cfa:
|
||
offset = insn->u.ri.offset;
|
||
if (offset < 0)
|
||
{
|
||
out_one (DW_CFA_def_cfa_sf);
|
||
out_uleb128 (insn->u.ri.reg);
|
||
out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
|
||
}
|
||
else
|
||
{
|
||
out_one (DW_CFA_def_cfa);
|
||
out_uleb128 (insn->u.ri.reg);
|
||
out_uleb128 (offset);
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_register:
|
||
case DW_CFA_undefined:
|
||
case DW_CFA_same_value:
|
||
out_one (insn->insn);
|
||
out_uleb128 (insn->u.r);
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_offset:
|
||
offset = insn->u.i;
|
||
if (offset < 0)
|
||
{
|
||
out_one (DW_CFA_def_cfa_offset_sf);
|
||
out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
|
||
}
|
||
else
|
||
{
|
||
out_one (DW_CFA_def_cfa_offset);
|
||
out_uleb128 (offset);
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_restore:
|
||
regno = insn->u.r;
|
||
if (regno <= 0x3F)
|
||
{
|
||
out_one (DW_CFA_restore + regno);
|
||
}
|
||
else
|
||
{
|
||
out_one (DW_CFA_restore_extended);
|
||
out_uleb128 (regno);
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_offset:
|
||
regno = insn->u.ri.reg;
|
||
offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
|
||
if (offset < 0)
|
||
{
|
||
out_one (DW_CFA_offset_extended_sf);
|
||
out_uleb128 (regno);
|
||
out_sleb128 (offset);
|
||
}
|
||
else if (regno <= 0x3F)
|
||
{
|
||
out_one (DW_CFA_offset + regno);
|
||
out_uleb128 (offset);
|
||
}
|
||
else
|
||
{
|
||
out_one (DW_CFA_offset_extended);
|
||
out_uleb128 (regno);
|
||
out_uleb128 (offset);
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_register:
|
||
out_one (DW_CFA_register);
|
||
out_uleb128 (insn->u.rr.reg1);
|
||
out_uleb128 (insn->u.rr.reg2);
|
||
break;
|
||
|
||
case DW_CFA_remember_state:
|
||
case DW_CFA_restore_state:
|
||
out_one (insn->insn);
|
||
break;
|
||
|
||
case DW_CFA_GNU_window_save:
|
||
out_one (DW_CFA_GNU_window_save);
|
||
break;
|
||
|
||
case CFI_escape:
|
||
{
|
||
struct cfi_escape_data *e;
|
||
for (e = insn->u.esc; e ; e = e->next)
|
||
emit_expr (&e->exp, 1);
|
||
break;
|
||
}
|
||
|
||
case CFI_val_encoded_addr:
|
||
{
|
||
unsigned encoding = insn->u.ea.encoding;
|
||
offsetT encoding_size;
|
||
|
||
if (encoding == DW_EH_PE_omit)
|
||
break;
|
||
out_one (DW_CFA_val_expression);
|
||
out_uleb128 (insn->u.ea.reg);
|
||
|
||
switch (encoding & 0x7)
|
||
{
|
||
case DW_EH_PE_absptr:
|
||
encoding_size = DWARF2_ADDR_SIZE (stdoutput);
|
||
break;
|
||
case DW_EH_PE_udata2:
|
||
encoding_size = 2;
|
||
break;
|
||
case DW_EH_PE_udata4:
|
||
encoding_size = 4;
|
||
break;
|
||
case DW_EH_PE_udata8:
|
||
encoding_size = 8;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
/* If the user has requested absolute encoding,
|
||
then use the smaller DW_OP_addr encoding. */
|
||
if (insn->u.ea.encoding == DW_EH_PE_absptr)
|
||
{
|
||
out_uleb128 (1 + encoding_size);
|
||
out_one (DW_OP_addr);
|
||
}
|
||
else
|
||
{
|
||
out_uleb128 (1 + 1 + encoding_size);
|
||
out_one (DW_OP_GNU_encoded_addr);
|
||
out_one (encoding);
|
||
|
||
if ((encoding & 0x70) == DW_EH_PE_pcrel)
|
||
{
|
||
#if CFI_DIFF_EXPR_OK
|
||
insn->u.ea.exp.X_op = O_subtract;
|
||
insn->u.ea.exp.X_op_symbol = symbol_temp_new_now ();
|
||
#elif defined (tc_cfi_emit_pcrel_expr)
|
||
tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, encoding_size);
|
||
break;
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
}
|
||
emit_expr (&insn->u.ea.exp, encoding_size);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
static offsetT
|
||
encoding_size (unsigned char encoding)
|
||
{
|
||
if (encoding == DW_EH_PE_omit)
|
||
return 0;
|
||
switch (encoding & 0x7)
|
||
{
|
||
case 0:
|
||
return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4;
|
||
case DW_EH_PE_udata2:
|
||
return 2;
|
||
case DW_EH_PE_udata4:
|
||
return 4;
|
||
case DW_EH_PE_udata8:
|
||
return 8;
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
static void
|
||
output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align)
|
||
{
|
||
symbolS *after_size_address, *end_address;
|
||
expressionS exp;
|
||
struct cfi_insn_data *i;
|
||
offsetT augmentation_size;
|
||
int enc;
|
||
enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
|
||
|
||
cie->start_address = symbol_temp_new_now ();
|
||
after_size_address = symbol_temp_make ();
|
||
end_address = symbol_temp_make ();
|
||
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = end_address;
|
||
exp.X_op_symbol = after_size_address;
|
||
exp.X_add_number = 0;
|
||
|
||
if (eh_frame || fmt == dwarf2_format_32bit)
|
||
emit_expr (&exp, 4); /* Length. */
|
||
else
|
||
{
|
||
if (fmt == dwarf2_format_64bit)
|
||
out_four (-1);
|
||
emit_expr (&exp, 8); /* Length. */
|
||
}
|
||
symbol_set_value_now (after_size_address);
|
||
if (eh_frame)
|
||
out_four (0); /* CIE id. */
|
||
else
|
||
{
|
||
out_four (-1); /* CIE id. */
|
||
if (fmt != dwarf2_format_32bit)
|
||
out_four (-1);
|
||
}
|
||
out_one (DW_CIE_VERSION); /* Version. */
|
||
if (eh_frame)
|
||
{
|
||
out_one ('z'); /* Augmentation. */
|
||
if (cie->per_encoding != DW_EH_PE_omit)
|
||
out_one ('P');
|
||
if (cie->lsda_encoding != DW_EH_PE_omit)
|
||
out_one ('L');
|
||
out_one ('R');
|
||
}
|
||
if (cie->signal_frame)
|
||
out_one ('S');
|
||
out_one (0);
|
||
out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */
|
||
out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */
|
||
if (DW_CIE_VERSION == 1) /* Return column. */
|
||
out_one (cie->return_column);
|
||
else
|
||
out_uleb128 (cie->return_column);
|
||
if (eh_frame)
|
||
{
|
||
augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit);
|
||
if (cie->per_encoding != DW_EH_PE_omit)
|
||
augmentation_size += 1 + encoding_size (cie->per_encoding);
|
||
out_uleb128 (augmentation_size); /* Augmentation size. */
|
||
|
||
if (cie->per_encoding != DW_EH_PE_omit)
|
||
{
|
||
offsetT size = encoding_size (cie->per_encoding);
|
||
out_one (cie->per_encoding);
|
||
exp = cie->personality;
|
||
if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel)
|
||
{
|
||
#if CFI_DIFF_EXPR_OK
|
||
exp.X_op = O_subtract;
|
||
exp.X_op_symbol = symbol_temp_new_now ();
|
||
emit_expr (&exp, size);
|
||
#elif defined (tc_cfi_emit_pcrel_expr)
|
||
tc_cfi_emit_pcrel_expr (&exp, size);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
else
|
||
emit_expr (&exp, size);
|
||
}
|
||
|
||
if (cie->lsda_encoding != DW_EH_PE_omit)
|
||
out_one (cie->lsda_encoding);
|
||
}
|
||
|
||
switch (DWARF2_FDE_RELOC_SIZE)
|
||
{
|
||
case 2:
|
||
enc = DW_EH_PE_sdata2;
|
||
break;
|
||
case 4:
|
||
enc = DW_EH_PE_sdata4;
|
||
break;
|
||
case 8:
|
||
enc = DW_EH_PE_sdata8;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
|
||
enc |= DW_EH_PE_pcrel;
|
||
#endif
|
||
if (eh_frame)
|
||
out_one (enc);
|
||
|
||
if (cie->first)
|
||
{
|
||
for (i = cie->first; i != cie->last; i = i->next)
|
||
{
|
||
if (CUR_SEG (i) != CUR_SEG (cie))
|
||
continue;
|
||
output_cfi_insn (i);
|
||
}
|
||
}
|
||
|
||
frag_align (align, DW_CFA_nop, 0);
|
||
symbol_set_value_now (end_address);
|
||
}
|
||
|
||
static void
|
||
output_fde (struct fde_entry *fde, struct cie_entry *cie,
|
||
bfd_boolean eh_frame, struct cfi_insn_data *first,
|
||
int align)
|
||
{
|
||
symbolS *after_size_address, *end_address;
|
||
expressionS exp;
|
||
offsetT augmentation_size;
|
||
enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
|
||
int offset_size;
|
||
int addr_size;
|
||
|
||
after_size_address = symbol_temp_make ();
|
||
end_address = symbol_temp_make ();
|
||
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = end_address;
|
||
exp.X_op_symbol = after_size_address;
|
||
exp.X_add_number = 0;
|
||
if (eh_frame || fmt == dwarf2_format_32bit)
|
||
offset_size = 4;
|
||
else
|
||
{
|
||
if (fmt == dwarf2_format_64bit)
|
||
out_four (-1);
|
||
offset_size = 8;
|
||
}
|
||
emit_expr (&exp, offset_size); /* Length. */
|
||
symbol_set_value_now (after_size_address);
|
||
|
||
if (eh_frame)
|
||
{
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = after_size_address;
|
||
exp.X_op_symbol = cie->start_address;
|
||
exp.X_add_number = 0;
|
||
emit_expr (&exp, offset_size); /* CIE offset. */
|
||
}
|
||
else
|
||
{
|
||
TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size);
|
||
}
|
||
|
||
if (eh_frame)
|
||
{
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_number = 0;
|
||
#if CFI_DIFF_EXPR_OK
|
||
exp.X_add_symbol = fde->start_address;
|
||
exp.X_op_symbol = symbol_temp_new_now ();
|
||
emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
|
||
#else
|
||
exp.X_op = O_symbol;
|
||
exp.X_add_symbol = fde->start_address;
|
||
#ifdef tc_cfi_emit_pcrel_expr
|
||
tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
|
||
#else
|
||
emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
|
||
#endif
|
||
#endif
|
||
addr_size = DWARF2_FDE_RELOC_SIZE;
|
||
}
|
||
else
|
||
{
|
||
exp.X_op = O_symbol;
|
||
exp.X_add_symbol = fde->start_address;
|
||
exp.X_add_number = 0;
|
||
addr_size = DWARF2_ADDR_SIZE (stdoutput);
|
||
emit_expr (&exp, addr_size);
|
||
}
|
||
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = fde->end_address;
|
||
exp.X_op_symbol = fde->start_address; /* Code length. */
|
||
exp.X_add_number = 0;
|
||
emit_expr (&exp, addr_size);
|
||
|
||
augmentation_size = encoding_size (fde->lsda_encoding);
|
||
if (eh_frame)
|
||
out_uleb128 (augmentation_size); /* Augmentation size. */
|
||
|
||
if (fde->lsda_encoding != DW_EH_PE_omit)
|
||
{
|
||
exp = fde->lsda;
|
||
if ((fde->lsda_encoding & 0x70) == DW_EH_PE_pcrel)
|
||
{
|
||
#if CFI_DIFF_LSDA_OK
|
||
exp.X_op = O_subtract;
|
||
exp.X_op_symbol = symbol_temp_new_now ();
|
||
emit_expr (&exp, augmentation_size);
|
||
#elif defined (tc_cfi_emit_pcrel_expr)
|
||
tc_cfi_emit_pcrel_expr (&exp, augmentation_size);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
else
|
||
emit_expr (&exp, augmentation_size);
|
||
}
|
||
|
||
for (; first; first = first->next)
|
||
if (CUR_SEG (first) == CUR_SEG (fde))
|
||
output_cfi_insn (first);
|
||
|
||
frag_align (align, DW_CFA_nop, 0);
|
||
symbol_set_value_now (end_address);
|
||
}
|
||
|
||
static struct cie_entry *
|
||
select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame,
|
||
struct cfi_insn_data **pfirst, int align)
|
||
{
|
||
struct cfi_insn_data *i, *j;
|
||
struct cie_entry *cie;
|
||
|
||
for (cie = cie_root; cie; cie = cie->next)
|
||
{
|
||
if (CUR_SEG (cie) != CUR_SEG (fde))
|
||
continue;
|
||
if (cie->return_column != fde->return_column
|
||
|| cie->signal_frame != fde->signal_frame
|
||
|| cie->per_encoding != fde->per_encoding
|
||
|| cie->lsda_encoding != fde->lsda_encoding)
|
||
continue;
|
||
if (cie->per_encoding != DW_EH_PE_omit)
|
||
{
|
||
if (cie->personality.X_op != fde->personality.X_op
|
||
|| cie->personality.X_add_number
|
||
!= fde->personality.X_add_number)
|
||
continue;
|
||
switch (cie->personality.X_op)
|
||
{
|
||
case O_constant:
|
||
if (cie->personality.X_unsigned != fde->personality.X_unsigned)
|
||
continue;
|
||
break;
|
||
case O_symbol:
|
||
if (cie->personality.X_add_symbol
|
||
!= fde->personality.X_add_symbol)
|
||
continue;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
for (i = cie->first, j = fde->data;
|
||
i != cie->last && j != NULL;
|
||
i = i->next, j = j->next)
|
||
{
|
||
if (i->insn != j->insn)
|
||
goto fail;
|
||
switch (i->insn)
|
||
{
|
||
case DW_CFA_advance_loc:
|
||
case DW_CFA_remember_state:
|
||
/* We reached the first advance/remember in the FDE,
|
||
but did not reach the end of the CIE list. */
|
||
goto fail;
|
||
|
||
case DW_CFA_offset:
|
||
case DW_CFA_def_cfa:
|
||
if (i->u.ri.reg != j->u.ri.reg)
|
||
goto fail;
|
||
if (i->u.ri.offset != j->u.ri.offset)
|
||
goto fail;
|
||
break;
|
||
|
||
case DW_CFA_register:
|
||
if (i->u.rr.reg1 != j->u.rr.reg1)
|
||
goto fail;
|
||
if (i->u.rr.reg2 != j->u.rr.reg2)
|
||
goto fail;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_register:
|
||
case DW_CFA_restore:
|
||
case DW_CFA_undefined:
|
||
case DW_CFA_same_value:
|
||
if (i->u.r != j->u.r)
|
||
goto fail;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_offset:
|
||
if (i->u.i != j->u.i)
|
||
goto fail;
|
||
break;
|
||
|
||
case CFI_escape:
|
||
case CFI_val_encoded_addr:
|
||
/* Don't bother matching these for now. */
|
||
goto fail;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
/* Success if we reached the end of the CIE list, and we've either
|
||
run out of FDE entries or we've encountered an advance,
|
||
remember, or escape. */
|
||
if (i == cie->last
|
||
&& (!j
|
||
|| j->insn == DW_CFA_advance_loc
|
||
|| j->insn == DW_CFA_remember_state
|
||
|| j->insn == CFI_escape
|
||
|| j->insn == CFI_val_encoded_addr))
|
||
{
|
||
*pfirst = j;
|
||
return cie;
|
||
}
|
||
|
||
fail:;
|
||
}
|
||
|
||
cie = (struct cie_entry *) xmalloc (sizeof (struct cie_entry));
|
||
cie->next = cie_root;
|
||
cie_root = cie;
|
||
SET_CUR_SEG (cie, CUR_SEG (fde));
|
||
cie->return_column = fde->return_column;
|
||
cie->signal_frame = fde->signal_frame;
|
||
cie->per_encoding = fde->per_encoding;
|
||
cie->lsda_encoding = fde->lsda_encoding;
|
||
cie->personality = fde->personality;
|
||
cie->first = fde->data;
|
||
|
||
for (i = cie->first; i ; i = i->next)
|
||
if (i->insn == DW_CFA_advance_loc
|
||
|| i->insn == DW_CFA_remember_state
|
||
|| i->insn == CFI_escape
|
||
|| i->insn == CFI_val_encoded_addr)
|
||
break;
|
||
|
||
cie->last = i;
|
||
*pfirst = i;
|
||
|
||
output_cie (cie, eh_frame, align);
|
||
|
||
return cie;
|
||
}
|
||
|
||
#ifdef md_reg_eh_frame_to_debug_frame
|
||
static void
|
||
cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg)
|
||
{
|
||
for (; insn; insn = insn->next)
|
||
{
|
||
if (CUR_SEG (insn) != ccseg)
|
||
continue;
|
||
switch (insn->insn)
|
||
{
|
||
case DW_CFA_advance_loc:
|
||
case DW_CFA_def_cfa_offset:
|
||
case DW_CFA_remember_state:
|
||
case DW_CFA_restore_state:
|
||
case DW_CFA_GNU_window_save:
|
||
case CFI_escape:
|
||
break;
|
||
|
||
case DW_CFA_def_cfa:
|
||
case DW_CFA_offset:
|
||
insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg);
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_register:
|
||
case DW_CFA_undefined:
|
||
case DW_CFA_same_value:
|
||
case DW_CFA_restore:
|
||
insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r);
|
||
break;
|
||
|
||
case DW_CFA_register:
|
||
insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1);
|
||
insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2);
|
||
break;
|
||
|
||
case CFI_val_encoded_addr:
|
||
insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg);
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
}
|
||
#else
|
||
#define cfi_change_reg_numbers(insn, cseg) do { } while (0)
|
||
#endif
|
||
|
||
static segT
|
||
get_cfi_seg (segT cseg, const char *base, flagword flags, int align)
|
||
{
|
||
if (SUPPORT_FRAME_LINKONCE)
|
||
{
|
||
struct dwcfi_seg_list *l;
|
||
|
||
l = dwcfi_hash_find_or_make (cseg, base, flags);
|
||
|
||
cseg = l->seg;
|
||
subseg_set (cseg, l->subseg);
|
||
}
|
||
else
|
||
{
|
||
cseg = subseg_new (base, 0);
|
||
bfd_set_section_flags (stdoutput, cseg, flags);
|
||
}
|
||
record_alignment (cseg, align);
|
||
return cseg;
|
||
}
|
||
|
||
void
|
||
cfi_finish (void)
|
||
{
|
||
struct cie_entry *cie, *cie_next;
|
||
segT cfi_seg, ccseg;
|
||
struct fde_entry *fde;
|
||
struct cfi_insn_data *first;
|
||
int save_flag_traditional_format, seek_next_seg;
|
||
|
||
if (all_fde_data == 0)
|
||
return;
|
||
|
||
if ((cfi_sections & CFI_EMIT_eh_frame) != 0)
|
||
{
|
||
/* Make sure check_eh_frame doesn't do anything with our output. */
|
||
save_flag_traditional_format = flag_traditional_format;
|
||
flag_traditional_format = 1;
|
||
|
||
if (!SUPPORT_FRAME_LINKONCE)
|
||
{
|
||
/* Open .eh_frame section. */
|
||
cfi_seg = get_cfi_seg (NULL, ".eh_frame",
|
||
(SEC_ALLOC | SEC_LOAD | SEC_DATA
|
||
| DWARF2_EH_FRAME_READ_ONLY),
|
||
EH_FRAME_ALIGNMENT);
|
||
#ifdef md_fix_up_eh_frame
|
||
md_fix_up_eh_frame (cfi_seg);
|
||
#else
|
||
(void) cfi_seg;
|
||
#endif
|
||
}
|
||
|
||
do
|
||
{
|
||
ccseg = NULL;
|
||
seek_next_seg = 0;
|
||
|
||
for (cie = cie_root; cie; cie = cie_next)
|
||
{
|
||
cie_next = cie->next;
|
||
free ((void *) cie);
|
||
}
|
||
cie_root = NULL;
|
||
|
||
for (fde = all_fde_data; fde ; fde = fde->next)
|
||
{
|
||
if (SUPPORT_FRAME_LINKONCE)
|
||
{
|
||
if (HANDLED (fde))
|
||
continue;
|
||
if (seek_next_seg && CUR_SEG (fde) != ccseg)
|
||
{
|
||
seek_next_seg = 2;
|
||
continue;
|
||
}
|
||
if (!seek_next_seg)
|
||
{
|
||
ccseg = CUR_SEG (fde);
|
||
/* Open .eh_frame section. */
|
||
cfi_seg = get_cfi_seg (ccseg, ".eh_frame",
|
||
(SEC_ALLOC | SEC_LOAD | SEC_DATA
|
||
| DWARF2_EH_FRAME_READ_ONLY),
|
||
EH_FRAME_ALIGNMENT);
|
||
#ifdef md_fix_up_eh_frame
|
||
md_fix_up_eh_frame (cfi_seg);
|
||
#else
|
||
(void) cfi_seg;
|
||
#endif
|
||
seek_next_seg = 1;
|
||
}
|
||
SET_HANDLED (fde, 1);
|
||
}
|
||
|
||
if (fde->end_address == NULL)
|
||
{
|
||
as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
|
||
fde->end_address = fde->start_address;
|
||
}
|
||
|
||
cie = select_cie_for_fde (fde, TRUE, &first, 2);
|
||
output_fde (fde, cie, TRUE, first,
|
||
fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
|
||
}
|
||
}
|
||
while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2);
|
||
|
||
if (SUPPORT_FRAME_LINKONCE)
|
||
for (fde = all_fde_data; fde ; fde = fde->next)
|
||
SET_HANDLED (fde, 0);
|
||
|
||
flag_traditional_format = save_flag_traditional_format;
|
||
}
|
||
|
||
if ((cfi_sections & CFI_EMIT_debug_frame) != 0)
|
||
{
|
||
int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1;
|
||
|
||
if (!SUPPORT_FRAME_LINKONCE)
|
||
get_cfi_seg (NULL, ".debug_frame",
|
||
SEC_READONLY | SEC_DEBUGGING,
|
||
alignment);
|
||
|
||
do
|
||
{
|
||
ccseg = NULL;
|
||
seek_next_seg = 0;
|
||
|
||
for (cie = cie_root; cie; cie = cie_next)
|
||
{
|
||
cie_next = cie->next;
|
||
free ((void *) cie);
|
||
}
|
||
cie_root = NULL;
|
||
|
||
for (fde = all_fde_data; fde ; fde = fde->next)
|
||
{
|
||
if (SUPPORT_FRAME_LINKONCE)
|
||
{
|
||
if (HANDLED (fde))
|
||
continue;
|
||
if (seek_next_seg && CUR_SEG (fde) != ccseg)
|
||
{
|
||
seek_next_seg = 2;
|
||
continue;
|
||
}
|
||
if (!seek_next_seg)
|
||
{
|
||
ccseg = CUR_SEG (fde);
|
||
/* Open .debug_frame section. */
|
||
get_cfi_seg (ccseg, ".debug_frame",
|
||
SEC_READONLY | SEC_DEBUGGING,
|
||
alignment);
|
||
seek_next_seg = 1;
|
||
}
|
||
SET_HANDLED (fde, 1);
|
||
}
|
||
if (fde->end_address == NULL)
|
||
{
|
||
as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
|
||
fde->end_address = fde->start_address;
|
||
}
|
||
|
||
fde->per_encoding = DW_EH_PE_omit;
|
||
fde->lsda_encoding = DW_EH_PE_omit;
|
||
cfi_change_reg_numbers (fde->data, ccseg);
|
||
cie = select_cie_for_fde (fde, FALSE, &first, alignment);
|
||
output_fde (fde, cie, FALSE, first, alignment);
|
||
}
|
||
}
|
||
while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2);
|
||
|
||
if (SUPPORT_FRAME_LINKONCE)
|
||
for (fde = all_fde_data; fde ; fde = fde->next)
|
||
SET_HANDLED (fde, 0);
|
||
}
|
||
}
|
||
|
||
#else /* TARGET_USE_CFIPOP */
|
||
|
||
/* Emit an intelligible error message for missing support. */
|
||
|
||
static void
|
||
dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED)
|
||
{
|
||
as_bad (_("CFI is not supported for this target"));
|
||
ignore_rest_of_line ();
|
||
}
|
||
|
||
const pseudo_typeS cfi_pseudo_table[] =
|
||
{
|
||
{ "cfi_sections", dot_cfi_dummy, 0 },
|
||
{ "cfi_startproc", dot_cfi_dummy, 0 },
|
||
{ "cfi_endproc", dot_cfi_dummy, 0 },
|
||
{ "cfi_def_cfa", dot_cfi_dummy, 0 },
|
||
{ "cfi_def_cfa_register", dot_cfi_dummy, 0 },
|
||
{ "cfi_def_cfa_offset", dot_cfi_dummy, 0 },
|
||
{ "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 },
|
||
{ "cfi_offset", dot_cfi_dummy, 0 },
|
||
{ "cfi_rel_offset", dot_cfi_dummy, 0 },
|
||
{ "cfi_register", dot_cfi_dummy, 0 },
|
||
{ "cfi_return_column", dot_cfi_dummy, 0 },
|
||
{ "cfi_restore", dot_cfi_dummy, 0 },
|
||
{ "cfi_undefined", dot_cfi_dummy, 0 },
|
||
{ "cfi_same_value", dot_cfi_dummy, 0 },
|
||
{ "cfi_remember_state", dot_cfi_dummy, 0 },
|
||
{ "cfi_restore_state", dot_cfi_dummy, 0 },
|
||
{ "cfi_window_save", dot_cfi_dummy, 0 },
|
||
{ "cfi_escape", dot_cfi_dummy, 0 },
|
||
{ "cfi_signal_frame", dot_cfi_dummy, 0 },
|
||
{ "cfi_personality", dot_cfi_dummy, 0 },
|
||
{ "cfi_lsda", dot_cfi_dummy, 0 },
|
||
{ "cfi_val_encoded_addr", dot_cfi_dummy, 0 },
|
||
{ NULL, NULL, 0 }
|
||
};
|
||
|
||
void
|
||
cfi_finish (void)
|
||
{
|
||
}
|
||
#endif /* TARGET_USE_CFIPOP */
|