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binutils-gdb/gas/dw2gencfi.c
Alan Modra 5a210b9fe8 dw2gencfi.c: use notes obstack 
Use notes obstack for dwcfi_hash entries, and free table.  Freeing the
table makes memory checkers complain more about "definitely lost"
memory as we've moved some from the "still reachable" category.
That will be fixed with a later patch.

	* dw2gencfi.c (get_debugseg_name): Allocate on notes obstack.
	(alloc_debugseg_item): Likewise.
	(dwcfi_hash_find_or_make): Adjust failure path free.
	(cfi_finish): Delete dwfci_hash.
2022-07-09 21:22:10 +09:30

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/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
Copyright (C) 2003-2022 Free Software Foundation, Inc.
Contributed by Michal Ludvig <mludvig@suse.cz>
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "as.h"
#include "dw2gencfi.h"
#include "subsegs.h"
#include "dwarf2dbg.h"
#ifdef TARGET_USE_CFIPOP
/* By default, use difference expressions if DIFF_EXPR_OK is defined. */
#ifndef CFI_DIFF_EXPR_OK
# ifdef DIFF_EXPR_OK
# define CFI_DIFF_EXPR_OK 1
# else
# define CFI_DIFF_EXPR_OK 0
# endif
#endif
#ifndef CFI_DIFF_LSDA_OK
#define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK
#endif
#if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0
# error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK"
#endif
/* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
of the CIE. Default to 1 if not otherwise specified. */
#ifndef DWARF2_LINE_MIN_INSN_LENGTH
#define DWARF2_LINE_MIN_INSN_LENGTH 1
#endif
/* By default, use 32-bit relocations from .eh_frame into .text. */
#ifndef DWARF2_FDE_RELOC_SIZE
#define DWARF2_FDE_RELOC_SIZE 4
#endif
/* By default, use a read-only .eh_frame section. */
#ifndef DWARF2_EH_FRAME_READ_ONLY
#define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY
#endif
#ifndef EH_FRAME_ALIGNMENT
#define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
#endif
#ifndef tc_cfi_frame_initial_instructions
#define tc_cfi_frame_initial_instructions() ((void)0)
#endif
#ifndef tc_cfi_startproc
# define tc_cfi_startproc() ((void)0)
#endif
#ifndef tc_cfi_endproc
# define tc_cfi_endproc(fde) ((void) (fde))
#endif
#define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh)
#ifndef DWARF2_FORMAT
#define DWARF2_FORMAT(SEC) dwarf2_format_32bit
#endif
#ifndef DWARF2_ADDR_SIZE
#define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
#endif
#if MULTIPLE_FRAME_SECTIONS
#define CUR_SEG(structp) structp->cur_seg
#define SET_CUR_SEG(structp, seg) structp->cur_seg = seg
#define HANDLED(structp) structp->handled
#define SET_HANDLED(structp, val) structp->handled = val
#else
#define CUR_SEG(structp) NULL
#define SET_CUR_SEG(structp, seg) (void) (0 && seg)
#define HANDLED(structp) 0
#define SET_HANDLED(structp, val) (void) (0 && val)
#endif
#ifndef tc_cfi_reloc_for_encoding
#define tc_cfi_reloc_for_encoding(e) BFD_RELOC_NONE
#endif
/* Private segment collection list. */
struct dwcfi_seg_list
{
segT seg;
int subseg;
char * seg_name;
};
#ifdef SUPPORT_COMPACT_EH
static bool compact_eh;
#else
#define compact_eh 0
#endif
static htab_t dwcfi_hash;
/* 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 unsigned int
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 ();
}
}
/* Emit expression EXP in ENCODING. If EMIT_ENCODING is true, first
emit a byte containing ENCODING. */
static void
emit_expr_encoded (expressionS *exp, int encoding, bool emit_encoding)
{
unsigned int size = encoding_size (encoding);
bfd_reloc_code_real_type code;
if (encoding == DW_EH_PE_omit)
return;
if (emit_encoding)
out_one (encoding);
code = tc_cfi_reloc_for_encoding (encoding);
if (code != BFD_RELOC_NONE)
{
reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
char *p = frag_more (size);
gas_assert (size == (unsigned) howto->bitsize / 8);
md_number_to_chars (p, 0, size);
fix_new (frag_now, p - frag_now->fr_literal, size, exp->X_add_symbol,
exp->X_add_number, howto->pc_relative, code);
}
else if ((encoding & 0x70) == DW_EH_PE_pcrel)
{
#if CFI_DIFF_EXPR_OK
expressionS tmp = *exp;
tmp.X_op = O_subtract;
tmp.X_op_symbol = symbol_temp_new_now ();
emit_expr (&tmp, size);
#elif defined (tc_cfi_emit_pcrel_expr)
tc_cfi_emit_pcrel_expr (exp, size);
#else
abort ();
#endif
}
else
emit_expr (exp, size);
}
/* Build based on segment the derived .debug_...
segment name containing origin segment's postfix name part. */
static char *
get_debugseg_name (segT seg, const char *base_name)
{
const char * name;
const char * dollar;
const char * dot;
if (!seg
|| (name = bfd_section_name (seg)) == NULL
|| *name == 0)
return notes_strdup (base_name);
dollar = strchr (name, '$');
dot = strchr (name + 1, '.');
if (!dollar && !dot)
{
if (!strcmp (base_name, ".eh_frame_entry")
&& strcmp (name, ".text") != 0)
return notes_concat (base_name, ".", name, NULL);
name = "";
}
else if (!dollar)
name = dot;
else if (!dot)
name = dollar;
else if (dot < dollar)
name = dot;
else
name = dollar;
return notes_concat (base_name, name, NULL);
}
/* Allocate a dwcfi_seg_list structure. */
static struct dwcfi_seg_list *
alloc_debugseg_item (segT seg, int subseg, char *name)
{
struct dwcfi_seg_list *r;
r = notes_alloc (sizeof (*r) + strlen (name));
r->seg = seg;
r->subseg = subseg;
r->seg_name = name;
return r;
}
static segT
is_now_linkonce_segment (void)
{
if (compact_eh)
return now_seg;
if ((bfd_section_flags (now_seg)
& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
| SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0)
return now_seg;
return NULL;
}
/* Generate debug... segment with same linkonce properties
of based segment. */
static segT
make_debug_seg (segT cseg, char *name, int sflags)
{
segT save_seg = now_seg;
int save_subseg = now_subseg;
segT r;
flagword flags;
r = subseg_new (name, 0);
/* Check if code segment is marked as linked once. */
if (!cseg)
flags = 0;
else
flags = (bfd_section_flags (cseg)
& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
| SEC_LINK_DUPLICATES_SAME_CONTENTS));
/* Add standard section flags. */
flags |= sflags;
/* Apply possibly linked once flags to new generated segment, too. */
if (!bfd_set_section_flags (r, flags))
as_bad (_("bfd_set_section_flags: %s"),
bfd_errmsg (bfd_get_error ()));
/* Restore to previous segment. */
if (save_seg != NULL)
subseg_set (save_seg, save_subseg);
return r;
}
static struct dwcfi_seg_list *
dwcfi_hash_find (char *name)
{
return (struct dwcfi_seg_list *) str_hash_find (dwcfi_hash, name);
}
static struct dwcfi_seg_list *
dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags)
{
struct dwcfi_seg_list *item;
char *name;
/* Initialize dwcfi_hash once. */
if (!dwcfi_hash)
dwcfi_hash = str_htab_create ();
name = get_debugseg_name (cseg, base_name);
item = dwcfi_hash_find (name);
if (!item)
{
item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name);
str_hash_insert (dwcfi_hash, item->seg_name, item, 0);
}
else
notes_free (name);
return item;
}
/* ??? Share this with dwarf2cfg.c. */
#ifndef TC_DWARF2_EMIT_OFFSET
#define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset
/* Create an offset to .dwarf2_*. */
static void
generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size)
{
expressionS exp;
exp.X_op = O_symbol;
exp.X_add_symbol = symbol;
exp.X_add_number = 0;
emit_expr (&exp, size);
}
#endif
struct cfi_escape_data
{
struct cfi_escape_data *next;
expressionS exp;
};
struct cie_entry
{
struct cie_entry *next;
#if MULTIPLE_FRAME_SECTIONS
segT cur_seg;
#endif
symbolS *start_address;
unsigned int return_column;
unsigned int signal_frame;
unsigned char fde_encoding;
unsigned char per_encoding;
unsigned char lsda_encoding;
expressionS personality;
#ifdef tc_cie_entry_extras
tc_cie_entry_extras
#endif
struct cfi_insn_data *first, *last;
};
/* List of FDE entries. */
struct fde_entry *all_fde_data;
static struct fde_entry **last_fde_data = &all_fde_data;
/* List of CIEs so that they could be reused. */
static struct cie_entry *cie_root;
/* Construct a new FDE structure and add it to the end of the fde list. */
static struct fde_entry *
alloc_fde_entry (void)
{
struct fde_entry *fde = XCNEW (struct fde_entry);
frchain_now->frch_cfi_data = XCNEW (struct frch_cfi_data);
frchain_now->frch_cfi_data->cur_fde_data = fde;
*last_fde_data = fde;
last_fde_data = &fde->next;
SET_CUR_SEG (fde, is_now_linkonce_segment ());
SET_HANDLED (fde, 0);
fde->last = &fde->data;
fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
fde->per_encoding = DW_EH_PE_omit;
fde->lsda_encoding = DW_EH_PE_omit;
fde->eh_header_type = EH_COMPACT_UNKNOWN;
#ifdef tc_fde_entry_init_extra
tc_fde_entry_init_extra (fde)
#endif
return fde;
}
/* The following functions are available for a backend to construct its
own unwind information, usually from legacy unwind directives. */
/* Construct a new INSN structure and add it to the end of the insn list
for the currently active FDE. */
static bool cfi_sections_set = false;
static int cfi_sections = CFI_EMIT_eh_frame;
int all_cfi_sections = 0;
static struct fde_entry *last_fde;
static struct cfi_insn_data *
alloc_cfi_insn_data (void)
{
struct cfi_insn_data *insn = XCNEW (struct cfi_insn_data);
struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data;
*cur_fde_data->last = insn;
cur_fde_data->last = &insn->next;
SET_CUR_SEG (insn, is_now_linkonce_segment ());
return insn;
}
/* Construct a new FDE structure that begins at LABEL. */
void
cfi_new_fde (symbolS *label)
{
struct fde_entry *fde = alloc_fde_entry ();
fde->start_address = label;
frchain_now->frch_cfi_data->last_address = label;
}
/* End the currently open FDE. */
void
cfi_end_fde (symbolS *label)
{
frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
free (frchain_now->frch_cfi_data);
frchain_now->frch_cfi_data = NULL;
}
/* Set the return column for the current FDE. */
void
cfi_set_return_column (unsigned regno)
{
frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
}
void
cfi_set_sections (void)
{
frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections;
cfi_sections_set = true;
}
/* Universal functions to store new instructions. */
static void
cfi_add_CFA_insn (int insn)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
insn_ptr->insn = insn;
}
static void
cfi_add_CFA_insn_reg (int insn, unsigned regno)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
insn_ptr->insn = insn;
insn_ptr->u.r = regno;
}
static void
cfi_add_CFA_insn_offset (int insn, offsetT offset)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
insn_ptr->insn = insn;
insn_ptr->u.i = offset;
}
static void
cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
insn_ptr->insn = insn;
insn_ptr->u.rr.reg1 = reg1;
insn_ptr->u.rr.reg2 = reg2;
}
static void
cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
insn_ptr->insn = insn;
insn_ptr->u.ri.reg = regno;
insn_ptr->u.ri.offset = offset;
}
/* Add a CFI insn to advance the PC from the last address to LABEL. */
void
cfi_add_advance_loc (symbolS *label)
{
struct cfi_insn_data *insn = alloc_cfi_insn_data ();
insn->insn = DW_CFA_advance_loc;
insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
insn->u.ll.lab2 = label;
frchain_now->frch_cfi_data->last_address = label;
}
/* Add a CFI insn to label the current position in the CFI segment. */
void
cfi_add_label (const char *name)
{
unsigned int len = strlen (name) + 1;
struct cfi_insn_data *insn = alloc_cfi_insn_data ();
insn->insn = CFI_label;
obstack_grow (&notes, name, len);
insn->u.sym_name = (char *) obstack_finish (&notes);
}
/* Add a DW_CFA_offset record to the CFI data. */
void
cfi_add_CFA_offset (unsigned regno, offsetT offset)
{
unsigned int abs_data_align;
gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset);
abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
if (offset % abs_data_align)
as_bad (_("register save offset not a multiple of %u"), abs_data_align);
}
/* Add a DW_CFA_val_offset record to the CFI data. */
void
cfi_add_CFA_val_offset (unsigned regno, offsetT offset)
{
unsigned int abs_data_align;
gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
cfi_add_CFA_insn_reg_offset (DW_CFA_val_offset, regno, offset);
abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
if (offset % abs_data_align)
as_bad (_("register save offset not a multiple of %u"), abs_data_align);
}
/* Add a DW_CFA_def_cfa record to the CFI data. */
void
cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
{
cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
frchain_now->frch_cfi_data->cur_cfa_offset = offset;
}
/* Add a DW_CFA_register record to the CFI data. */
void
cfi_add_CFA_register (unsigned reg1, unsigned reg2)
{
cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2);
}
/* Add a DW_CFA_def_cfa_register record to the CFI data. */
void
cfi_add_CFA_def_cfa_register (unsigned regno)
{
cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno);
}
/* Add a DW_CFA_def_cfa_offset record to the CFI data. */
void
cfi_add_CFA_def_cfa_offset (offsetT offset)
{
cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
frchain_now->frch_cfi_data->cur_cfa_offset = offset;
}
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 = XNEW (struct cfa_save_data);
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_fde_data (int);
static void dot_cfi_personality (int);
static void dot_cfi_personality_id (int);
static void dot_cfi_lsda (int);
static void dot_cfi_val_encoded_addr (int);
static void dot_cfi_inline_lsda (int);
static void dot_cfi_label (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_fde_data", dot_cfi_fde_data, 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_negate_ra_state", dot_cfi, DW_CFA_AARCH64_negate_ra_state },
{ "cfi_escape", dot_cfi_escape, 0 },
{ "cfi_signal_frame", dot_cfi, CFI_signal_frame },
{ "cfi_personality", dot_cfi_personality, 0 },
{ "cfi_personality_id", dot_cfi_personality_id, 0 },
{ "cfi_lsda", dot_cfi_lsda, 0 },
{ "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 },
{ "cfi_inline_lsda", dot_cfi_inline_lsda, 0 },
{ "cfi_label", dot_cfi_label, 0 },
{ "cfi_val_offset", dot_cfi, DW_CFA_val_offset },
{ 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;
c = get_symbol_name (& name);
exp->X_op = O_constant;
exp->X_add_number = tc_regname_to_dw2regnum (name);
restore_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 DW_CFA_val_offset:
reg1 = cfi_parse_reg ();
cfi_parse_separator ();
offset = cfi_parse_const ();
cfi_add_CFA_val_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 = XNEW (struct cfi_escape_data);
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)
&& tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
{
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)
&& tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
{
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;
/* Fall through. */
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 ();
}
static void
dot_cfi_label (int ignored ATTRIBUTE_UNUSED)
{
char *name;
if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_("CFI instruction used without previous .cfi_startproc"));
ignore_rest_of_line ();
return;
}
name = read_symbol_name ();
if (name == NULL)
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 ());
cfi_add_label (name);
free (name);
demand_empty_rest_of_line ();
}
static void
dot_cfi_sections (int ignored ATTRIBUTE_UNUSED)
{
int sections = 0;
SKIP_WHITESPACE ();
if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"')
while (1)
{
char * saved_ilp;
char *name, c;
saved_ilp = input_line_pointer;
c = get_symbol_name (& name);
if (startswith (name, ".eh_frame")
&& name[9] != '_')
sections |= CFI_EMIT_eh_frame;
else if (startswith (name, ".debug_frame"))
sections |= CFI_EMIT_debug_frame;
#if SUPPORT_COMPACT_EH
else if (startswith (name, ".eh_frame_entry"))
{
compact_eh = true;
sections |= CFI_EMIT_eh_frame_compact;
}
#endif
#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 = saved_ilp;
break;
}
*input_line_pointer = c;
SKIP_WHITESPACE_AFTER_NAME ();
if (*input_line_pointer == ',')
{
name = input_line_pointer++;
SKIP_WHITESPACE ();
if (!is_name_beginner (*input_line_pointer)
&& *input_line_pointer != '"')
{
input_line_pointer = name;
break;
}
}
else if (is_name_beginner (*input_line_pointer)
|| *input_line_pointer == '"')
break;
}
demand_empty_rest_of_line ();
if (cfi_sections_set
&& (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
&& ((cfi_sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
!= (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))))
as_bad (_("inconsistent uses of .cfi_sections"));
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) || *input_line_pointer == '"')
{
char * saved_ilp = input_line_pointer;
char *name, c;
c = get_symbol_name (& name);
if (strcmp (name, "simple") == 0)
{
simple = 1;
restore_line_pointer (c);
}
else
input_line_pointer = saved_ilp;
}
demand_empty_rest_of_line ();
cfi_sections_set = true;
all_cfi_sections |= cfi_sections;
cfi_set_sections ();
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)
{
if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
ignore_rest_of_line ();
return;
}
last_fde = frchain_now->frch_cfi_data->cur_fde_data;
cfi_end_fde (symbol_temp_new_now ());
demand_empty_rest_of_line ();
cfi_sections_set = true;
if ((cfi_sections & CFI_EMIT_target) != 0)
tc_cfi_endproc (last_fde);
}
static segT
get_cfi_seg (segT cseg, const char *base, flagword flags, int align)
{
/* Exclude .debug_frame sections for Compact EH. */
if (SUPPORT_FRAME_LINKONCE || ((flags & SEC_DEBUGGING) == 0 && compact_eh))
{
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 (cseg, flags);
}
record_alignment (cseg, align);
return cseg;
}
#if SUPPORT_COMPACT_EH
static void
dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
{
struct fde_entry *fde;
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;
fde->personality_id = cfi_parse_const ();
demand_empty_rest_of_line ();
if (fde->personality_id == 0 || fde->personality_id > 3)
{
as_bad (_("wrong argument to .cfi_personality_id"));
return;
}
}
static void
dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
{
if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_(".cfi_fde_data without corresponding .cfi_startproc"));
ignore_rest_of_line ();
return;
}
last_fde = frchain_now->frch_cfi_data->cur_fde_data;
cfi_sections_set = true;
if ((cfi_sections & CFI_EMIT_target) != 0
|| (cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
{
struct cfi_escape_data *head, **tail, *e;
int num_ops = 0;
tail = &head;
if (!is_it_end_of_statement ())
{
num_ops = 0;
do
{
e = XNEW (struct cfi_escape_data);
do_parse_cons_expression (&e->exp, 1);
*tail = e;
tail = &e->next;
num_ops++;
}
while (*input_line_pointer++ == ',');
--input_line_pointer;
}
*tail = NULL;
if (last_fde->lsda_encoding != DW_EH_PE_omit)
last_fde->eh_header_type = EH_COMPACT_HAS_LSDA;
else if (num_ops <= 3 && last_fde->per_encoding == DW_EH_PE_omit)
last_fde->eh_header_type = EH_COMPACT_INLINE;
else
last_fde->eh_header_type = EH_COMPACT_OUTLINE;
if (last_fde->eh_header_type == EH_COMPACT_INLINE)
num_ops = 3;
last_fde->eh_data_size = num_ops;
last_fde->eh_data = XNEWVEC (bfd_byte, num_ops);
num_ops = 0;
while (head)
{
e = head;
head = e->next;
last_fde->eh_data[num_ops++] = e->exp.X_add_number;
free (e);
}
if (last_fde->eh_header_type == EH_COMPACT_INLINE)
while (num_ops < 3)
last_fde->eh_data[num_ops++] = tc_compact_eh_opcode_stop;
}
demand_empty_rest_of_line ();
}
/* Function to emit the compact unwinding opcodes stored in the
fde's eh_data field. The end of the opcode data will be
padded to the value in align. */
static void
output_compact_unwind_data (struct fde_entry *fde, int align)
{
int data_size = fde->eh_data_size + 2;
int align_padding;
int amask;
char *p;
fde->eh_loc = symbol_temp_new_now ();
p = frag_more (1);
if (fde->personality_id != 0)
*p = fde->personality_id;
else if (fde->per_encoding != DW_EH_PE_omit)
{
*p = 0;
emit_expr_encoded (&fde->personality, fde->per_encoding, false);
data_size += encoding_size (fde->per_encoding);
}
else
*p = 1;
amask = (1 << align) - 1;
align_padding = ((data_size + amask) & ~amask) - data_size;
p = frag_more (fde->eh_data_size + 1 + align_padding);
memcpy (p, fde->eh_data, fde->eh_data_size);
p += fde->eh_data_size;
while (align_padding-- > 0)
*(p++) = tc_compact_eh_opcode_pad;
*(p++) = tc_compact_eh_opcode_stop;
fde->eh_header_type = EH_COMPACT_OUTLINE_DONE;
}
/* Handle the .cfi_inline_lsda directive. */
static void
dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
{
segT ccseg;
int align;
long max_alignment = 28;
if (!last_fde)
{
as_bad (_("unexpected .cfi_inline_lsda"));
ignore_rest_of_line ();
return;
}
if ((last_fde->sections & CFI_EMIT_eh_frame_compact) == 0)
{
as_bad (_(".cfi_inline_lsda not valid for this frame"));
ignore_rest_of_line ();
return;
}
if (last_fde->eh_header_type != EH_COMPACT_UNKNOWN
&& last_fde->eh_header_type != EH_COMPACT_HAS_LSDA)
{
as_bad (_(".cfi_inline_lsda seen for frame without .cfi_lsda"));
ignore_rest_of_line ();
return;
}
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
align = get_absolute_expression ();
if (align > max_alignment)
{
align = max_alignment;
as_bad (_("Alignment too large: %d. assumed."), align);
}
else if (align < 0)
{
as_warn (_("Alignment negative: 0 assumed."));
align = 0;
}
demand_empty_rest_of_line ();
ccseg = CUR_SEG (last_fde);
/* Open .gnu_extab section. */
get_cfi_seg (ccseg, ".gnu_extab",
(SEC_ALLOC | SEC_LOAD | SEC_DATA
| DWARF2_EH_FRAME_READ_ONLY),
1);
frag_align (align, 0, 0);
record_alignment (now_seg, align);
if (last_fde->eh_header_type == EH_COMPACT_HAS_LSDA)
output_compact_unwind_data (last_fde, align);
last_fde = NULL;
return;
}
#else /* !SUPPORT_COMPACT_EH */
static void
dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
{
as_bad (_(".cfi_inline_lsda is not supported for this target"));
ignore_rest_of_line ();
}
static void
dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
{
as_bad (_(".cfi_fde_data is not supported for this target"));
ignore_rest_of_line ();
}
static void
dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
{
as_bad (_(".cfi_personality_id is not supported for this target"));
ignore_rest_of_line ();
}
#endif
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 == 0)
;
else 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. Call frag_grow with the sum of
room needed by frag_more and frag_var to preallocate space
ensuring that the DW_CFA_advance_loc4 is in the fixed part
of the rs_cfa frag, so that the relax machinery can remove
the advance_loc should it advance by zero. */
frag_grow (5);
*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_val_offset:
regno = insn->u.ri.reg;
offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
if (offset < 0)
{
out_one (DW_CFA_val_offset_sf);
out_uleb128 (regno);
out_sleb128 (offset);
}
else
{
out_one (DW_CFA_val_offset);
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 enc_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:
enc_size = DWARF2_ADDR_SIZE (stdoutput);
break;
case DW_EH_PE_udata2:
enc_size = 2;
break;
case DW_EH_PE_udata4:
enc_size = 4;
break;
case DW_EH_PE_udata8:
enc_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 + enc_size);
out_one (DW_OP_addr);
}
else
{
out_uleb128 (1 + 1 + enc_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, enc_size);
break;
#else
abort ();
#endif
}
}
emit_expr (&insn->u.ea.exp, enc_size);
}
break;
case CFI_label:
colon (insn->u.sym_name);
break;
default:
abort ();
}
}
static void
output_cie (struct cie_entry *cie, bool 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 (flag_dwarf_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');
#ifdef tc_output_cie_extra
tc_output_cie_extra (cie);
#endif
}
if (cie->signal_frame)
out_one ('S');
out_one (0);
if (flag_dwarf_cie_version >= 4)
{
/* For now we are assuming a flat address space with 4 or 8 byte
addresses. */
int address_size = dwarf2_format_32bit ? 4 : 8;
out_one (address_size); /* Address size. */
out_one (0); /* Segment size. */
}
out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */
out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */
if (flag_dwarf_cie_version == 1) /* Return column. */
{
if ((cie->return_column & 0xff) != cie->return_column)
as_bad (_("return column number %d overflows in CIE version 1"),
cie->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. */
emit_expr_encoded (&cie->personality, cie->per_encoding, true);
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
#ifdef DWARF2_FDE_RELOC_ENCODING
/* Allow target to override encoding. */
enc = DWARF2_FDE_RELOC_ENCODING (enc);
#endif
cie->fde_encoding = enc;
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,
bool 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);
unsigned int offset_size;
unsigned 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);
}
exp.X_op = O_symbol;
if (eh_frame)
{
bfd_reloc_code_real_type code
= tc_cfi_reloc_for_encoding (cie->fde_encoding);
addr_size = DWARF2_FDE_RELOC_SIZE;
if (code != BFD_RELOC_NONE)
{
reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
char *p = frag_more (addr_size);
gas_assert (addr_size == (unsigned) howto->bitsize / 8);
md_number_to_chars (p, 0, addr_size);
fix_new (frag_now, p - frag_now->fr_literal, addr_size,
fde->start_address, 0, howto->pc_relative, code);
}
else
{
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, addr_size); /* Code offset. */
#else
exp.X_op = O_symbol;
exp.X_add_symbol = fde->start_address;
#if defined(tc_cfi_emit_pcrel_expr)
tc_cfi_emit_pcrel_expr (&exp, addr_size); /* Code offset. */
#else
emit_expr (&exp, addr_size); /* Code offset. */
#endif
#endif
}
}
else
{
exp.X_add_number = 0;
exp.X_add_symbol = fde->start_address;
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. */
emit_expr_encoded (&fde->lsda, cie->lsda_encoding, false);
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);
}
/* Allow these insns to be put in the initial sequence of a CIE.
If J is non-NULL, then compare I and J insns for a match. */
static inline bool
initial_cie_insn (const struct cfi_insn_data *i, const struct cfi_insn_data *j)
{
if (j && i->insn != j->insn)
return false;
switch (i->insn)
{
case DW_CFA_offset:
case DW_CFA_def_cfa:
case DW_CFA_val_offset:
if (j)
{
if (i->u.ri.reg != j->u.ri.reg)
return false;
if (i->u.ri.offset != j->u.ri.offset)
return false;
}
break;
case DW_CFA_register:
if (j)
{
if (i->u.rr.reg1 != j->u.rr.reg1)
return false;
if (i->u.rr.reg2 != j->u.rr.reg2)
return false;
}
break;
case DW_CFA_def_cfa_register:
case DW_CFA_restore:
case DW_CFA_undefined:
case DW_CFA_same_value:
if (j)
{
if (i->u.r != j->u.r)
return false;
}
break;
case DW_CFA_def_cfa_offset:
if (j)
{
if (i->u.i != j->u.i)
return false;
}
break;
default:
return false;
}
return true;
}
static struct cie_entry *
select_cie_for_fde (struct fde_entry *fde, bool 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;
#ifdef tc_cie_fde_equivalent_extra
if (!tc_cie_fde_equivalent_extra (cie, fde))
continue;
#endif
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 (!initial_cie_insn (i, j))
break;
}
if (i == cie->last)
{
*pfirst = j;
return cie;
}
}
cie = XNEW (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;
#ifdef tc_cie_entry_init_extra
tc_cie_entry_init_extra (cie, fde)
#endif
for (i = cie->first; i ; i = i->next)
if (!initial_cie_insn (i, NULL))
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:
case CFI_label:
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
#if SUPPORT_COMPACT_EH
static void
cfi_emit_eh_header (symbolS *sym, bfd_vma addend)
{
expressionS exp;
exp.X_add_number = addend;
exp.X_add_symbol = sym;
emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, false);
}
static void
output_eh_header (struct fde_entry *fde)
{
char *p;
bfd_vma addend;
if (fde->eh_header_type == EH_COMPACT_INLINE)
addend = 0;
else
addend = 1;
cfi_emit_eh_header (fde->start_address, addend);
if (fde->eh_header_type == EH_COMPACT_INLINE)
{
p = frag_more (4);
/* Inline entries always use PR1. */
*(p++) = 1;
memcpy(p, fde->eh_data, 3);
}
else
{
if (fde->eh_header_type == EH_COMPACT_LEGACY)
addend = 1;
else if (fde->eh_header_type == EH_COMPACT_OUTLINE
|| fde->eh_header_type == EH_COMPACT_OUTLINE_DONE)
addend = 0;
else
abort ();
cfi_emit_eh_header (fde->eh_loc, addend);
}
}
#endif
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;
cfi_sections_set = true;
if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0
|| (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 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 (!EH_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 ((fde->sections & CFI_EMIT_eh_frame) == 0
&& (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
continue;
#if SUPPORT_COMPACT_EH
/* Emit a LEGACY format header if we have processed all
of the .cfi directives without encountering either inline or
out-of-line compact unwinding opcodes. */
if (fde->eh_header_type == EH_COMPACT_HAS_LSDA
|| fde->eh_header_type == EH_COMPACT_UNKNOWN)
fde->eh_header_type = EH_COMPACT_LEGACY;
if (fde->eh_header_type != EH_COMPACT_LEGACY)
continue;
#endif
if (EH_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);
fde->eh_loc = symbol_temp_new_now ();
output_fde (fde, cie, true, first,
fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
}
}
while (EH_FRAME_LINKONCE && seek_next_seg == 2);
if (EH_FRAME_LINKONCE)
for (fde = all_fde_data; fde ; fde = fde->next)
SET_HANDLED (fde, 0);
#if SUPPORT_COMPACT_EH
if (compact_eh)
{
/* Create remaining out of line table entries. */
do
{
ccseg = NULL;
seek_next_seg = 0;
for (fde = all_fde_data; fde ; fde = fde->next)
{
if ((fde->sections & CFI_EMIT_eh_frame) == 0
&& (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
continue;
if (fde->eh_header_type != EH_COMPACT_OUTLINE)
continue;
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 .gnu_extab section. */
get_cfi_seg (ccseg, ".gnu_extab",
(SEC_ALLOC | SEC_LOAD | SEC_DATA
| DWARF2_EH_FRAME_READ_ONLY),
1);
seek_next_seg = 1;
}
SET_HANDLED (fde, 1);
frag_align (1, 0, 0);
record_alignment (now_seg, 1);
output_compact_unwind_data (fde, 1);
}
}
while (EH_FRAME_LINKONCE && seek_next_seg == 2);
for (fde = all_fde_data; fde ; fde = fde->next)
SET_HANDLED (fde, 0);
/* Create index table fragments. */
do
{
ccseg = NULL;
seek_next_seg = 0;
for (fde = all_fde_data; fde ; fde = fde->next)
{
if ((fde->sections & CFI_EMIT_eh_frame) == 0
&& (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
continue;
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_entry section. */
cfi_seg = get_cfi_seg (ccseg, ".eh_frame_entry",
(SEC_ALLOC | SEC_LOAD | SEC_DATA
| DWARF2_EH_FRAME_READ_ONLY),
2);
seek_next_seg = 1;
}
SET_HANDLED (fde, 1);
output_eh_header (fde);
}
}
while (seek_next_seg == 2);
for (fde = all_fde_data; fde ; fde = fde->next)
SET_HANDLED (fde, 0);
}
#endif /* SUPPORT_COMPACT_EH */
flag_traditional_format = save_flag_traditional_format;
}
cfi_sections_set = true;
if ((all_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 ((fde->sections & CFI_EMIT_debug_frame) == 0)
continue;
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);
}
if (dwcfi_hash)
htab_delete (dwcfi_hash);
}
#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_fde_data", 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_personality_id", dot_cfi_dummy, 0 },
{ "cfi_lsda", dot_cfi_dummy, 0 },
{ "cfi_val_encoded_addr", dot_cfi_dummy, 0 },
{ "cfi_label", dot_cfi_dummy, 0 },
{ "cfi_inline_lsda", dot_cfi_dummy, 0 },
{ "cfi_val_offset", dot_cfi_dummy, 0 },
{ NULL, NULL, 0 }
};
void
cfi_finish (void)
{
}
#endif /* TARGET_USE_CFIPOP */
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