/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ 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 2, or (at your option)
+ 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,
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, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ 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
+#ifndef DWARF2_LINE_MIN_INSN_LENGTH
# define DWARF2_LINE_MIN_INSN_LENGTH 1
#endif
-/* If TARGET_USE_CFIPOP is defined, it is required that the target
- provide the following definitions. Otherwise provide them to
- allow compilation to continue. */
-#ifndef TARGET_USE_CFIPOP
-# ifndef DWARF2_DEFAULT_RETURN_COLUMN
-# define DWARF2_DEFAULT_RETURN_COLUMN 0
-# endif
-# ifndef DWARF2_CIE_DATA_ALIGNMENT
-# define DWARF2_CIE_DATA_ALIGNMENT 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
-# ifdef BFD_ASSEMBLER
-# define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
-# else
-# define EH_FRAME_ALIGNMENT 2
-# endif
+# 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 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
+
+struct cfi_escape_data {
+ struct cfi_escape_data *next;
+ expressionS exp;
+};
struct cfi_insn_data
{
symbolS *lab2;
} ll;
- struct cfi_escape_data {
- struct cfi_escape_data *next;
+ struct cfi_escape_data *esc;
+
+ struct {
+ unsigned reg, encoding;
expressionS exp;
- } *esc;
+ } ea;
} u;
};
symbolS *end_address;
struct cfi_insn_data *data;
struct cfi_insn_data **last;
+ unsigned char per_encoding;
+ unsigned char lsda_encoding;
+ expressionS personality;
+ expressionS lsda;
unsigned int return_column;
+ unsigned int signal_frame;
};
struct cie_entry
struct cie_entry *next;
symbolS *start_address;
unsigned int return_column;
+ unsigned int signal_frame;
+ unsigned char per_encoding;
+ unsigned char lsda_encoding;
+ expressionS personality;
struct cfi_insn_data *first, *last;
};
-/* Current open FDE entry. */
-static struct fde_entry *cur_fde_data;
-static symbolS *last_address;
-static offsetT cur_cfa_offset;
-
/* List of FDE entries. */
static struct fde_entry *all_fde_data;
static struct fde_entry **last_fde_data = &all_fde_data;
offsetT cfa_offset;
};
-static struct cfa_save_data *cfa_save_stack;
+/* Current open FDE entry. */
+struct frch_cfi_data
+{
+ struct fde_entry *cur_fde_data;
+ symbolS *last_address;
+ offsetT cur_cfa_offset;
+ struct cfa_save_data *cfa_save_stack;
+};
\f
/* 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 = xcalloc (1, sizeof (struct fde_entry));
+ struct fde_entry *fde = (struct fde_entry *)
+ xcalloc (1, sizeof (struct fde_entry));
- cur_fde_data = fde;
+ frchain_now->frch_cfi_data = (struct frch_cfi_data *)
+ xcalloc (1, sizeof (struct frch_cfi_data));
+ frchain_now->frch_cfi_data->cur_fde_data = fde;
*last_fde_data = fde;
last_fde_data = &fde->next;
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;
return fde;
}
static struct cfi_insn_data *
alloc_cfi_insn_data (void)
{
- struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data));
+ struct cfi_insn_data *insn = (struct cfi_insn_data *)
+ xcalloc (1, sizeof (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;
{
struct fde_entry *fde = alloc_fde_entry ();
fde->start_address = label;
- last_address = label;
+ frchain_now->frch_cfi_data->last_address = label;
}
/* End the currently open FDE. */
void
cfi_end_fde (symbolS *label)
{
- cur_fde_data->end_address = label;
- cur_fde_data = NULL;
+ 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)
{
- cur_fde_data->return_column = regno;
+ frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
}
/* Universal functions to store new instructions. */
struct cfi_insn_data *insn = alloc_cfi_insn_data ();
insn->insn = DW_CFA_advance_loc;
- insn->u.ll.lab1 = last_address;
+ insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
insn->u.ll.lab2 = label;
- last_address = label;
+ frchain_now->frch_cfi_data->last_address = label;
}
/* Add a DW_CFA_offset record to the CFI data. */
{
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
cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
{
cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
- cur_cfa_offset = offset;
+ frchain_now->frch_cfi_data->cur_cfa_offset = offset;
}
/* Add a DW_CFA_register record to the CFI data. */
cfi_add_CFA_def_cfa_offset (offsetT offset)
{
cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
- cur_cfa_offset = offset;
+ frchain_now->frch_cfi_data->cur_cfa_offset = offset;
}
void
cfi_add_CFA_insn (DW_CFA_remember_state);
- p = xmalloc (sizeof (*p));
- p->cfa_offset = cur_cfa_offset;
- p->next = cfa_save_stack;
- cfa_save_stack = p;
+ 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_insn (DW_CFA_restore_state);
- p = cfa_save_stack;
+ p = frchain_now->frch_cfi_data->cfa_save_stack;
if (p)
{
- cur_cfa_offset = p->cfa_offset;
- cfa_save_stack = p->next;
+ 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"));
}
\f
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);
/* Fake CFI type; outside the byte range of any real CFI insn. */
#define CFI_adjust_cfa_offset 0x100
#define CFI_return_column 0x101
#define CFI_rel_offset 0x102
#define CFI_escape 0x103
+#define CFI_signal_frame 0x104
+#define CFI_val_encoded_addr 0x105
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_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 }
};
as_bad (_("missing separator"));
}
-static unsigned
-cfi_parse_reg (void)
+#ifndef tc_parse_to_dw2regnum
+static void
+tc_parse_to_dw2regnum(expressionS *exp)
{
- int regno;
- expressionS exp;
-
-#ifdef tc_regname_to_dw2regnum
+# ifdef tc_regname_to_dw2regnum
SKIP_WHITESPACE ();
if (is_name_beginner (*input_line_pointer)
|| (*input_line_pointer == '%'
name = input_line_pointer;
c = get_symbol_end ();
- if ((regno = tc_regname_to_dw2regnum (name)) < 0)
- {
- as_bad (_("bad register expression"));
- regno = 0;
- }
+ exp->X_op = O_constant;
+ exp->X_add_number = tc_regname_to_dw2regnum (name);
*input_line_pointer = c;
- return regno;
}
+ else
+# endif
+ expression_and_evaluate (exp);
+}
#endif
- expression (&exp);
+static unsigned
+cfi_parse_reg (void)
+{
+ int regno;
+ expressionS exp;
+
+ tc_parse_to_dw2regnum (&exp);
switch (exp.X_op)
{
case O_register:
break;
default:
+ regno = -1;
+ break;
+ }
+
+ if (regno < 0)
+ {
as_bad (_("bad register expression"));
regno = 0;
- break;
}
return regno;
offsetT offset;
unsigned reg1, reg2;
- if (!cur_fde_data)
+ 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 (last_address) != frag_now
- || S_GET_VALUE (last_address) != frag_now_fix ())
+ 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)
reg1 = cfi_parse_reg ();
cfi_parse_separator ();
offset = cfi_parse_const ();
- cfi_add_CFA_offset (reg1, offset - cur_cfa_offset);
+ cfi_add_CFA_offset (reg1,
+ offset - frchain_now->frch_cfi_data->cur_cfa_offset);
break;
case DW_CFA_def_cfa:
case CFI_adjust_cfa_offset:
offset = cfi_parse_const ();
- cfi_add_CFA_def_cfa_offset (cur_cfa_offset + offset);
+ cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
+ + offset);
break;
case DW_CFA_restore:
- reg1 = cfi_parse_reg ();
- cfi_add_CFA_restore (reg1);
+ 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:
- reg1 = cfi_parse_reg ();
- cfi_add_CFA_undefined (reg1);
+ 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:
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 ();
}
struct cfi_escape_data *head, **tail, *e;
struct cfi_insn_data *insn;
- if (!cur_fde_data)
+ 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 (last_address) != frag_now
- || S_GET_VALUE (last_address) != frag_now_fix ())
+ 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 = xmalloc (sizeof (*e));
+ e = (struct cfi_escape_data *) xmalloc (sizeof (*e));
do_parse_cons_expression (&e->exp, 1);
*tail = e;
tail = &e->next;
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)
+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 (strcmp (name, ".eh_frame") == 0)
+ sections |= CFI_EMIT_eh_frame;
+ else if (strcmp (name, ".debug_frame") == 0)
+ sections |= CFI_EMIT_debug_frame;
+ 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
{
int simple = 0;
- if (cur_fde_data)
+ if (frchain_now->frch_cfi_data != NULL)
{
as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
+ ignore_rest_of_line ();
return;
}
}
demand_empty_rest_of_line ();
+ frchain_now->frch_cfi_data->cur_cfa_offset = 0;
if (!simple)
tc_cfi_frame_initial_instructions ();
}
static void
dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
{
- if (! cur_fde_data)
+ if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
+ ignore_rest_of_line ();
return;
}
cfi_end_fde (symbol_temp_new_now ());
+
+ demand_empty_rest_of_line ();
}
\f
if (scaled <= 0x3F)
out_one (DW_CFA_advance_loc + scaled);
- else if (delta <= 0xFF)
+ else if (scaled <= 0xFF)
{
- out_one (DW_CFA_advance_loc1);
- out_one (delta);
+ out_one (DW_CFA_advance_loc1);
+ out_one (scaled);
}
- else if (delta <= 0xFFFF)
+ else if (scaled <= 0xFFFF)
{
- out_one (DW_CFA_advance_loc2);
- out_two (delta);
+ out_one (DW_CFA_advance_loc2);
+ out_two (scaled);
}
else
{
- out_one (DW_CFA_advance_loc4);
- out_four (delta);
+ out_one (DW_CFA_advance_loc4);
+ out_four (scaled);
}
}
else
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);
+ *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,
{
out_one (DW_CFA_def_cfa_sf);
out_uleb128 (insn->u.ri.reg);
- out_uleb128 (offset);
+ out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
}
else
{
if (offset < 0)
{
out_one (DW_CFA_def_cfa_offset_sf);
- out_sleb128 (offset);
+ out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
}
else
{
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)
+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 ();
exp.X_op_symbol = after_size_address;
exp.X_add_number = 0;
- emit_expr (&exp, 4); /* Length */
+ 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);
- out_four (0); /* CIE id */
- out_one (DW_CIE_VERSION); /* Version */
- out_one ('z'); /* Augmentation */
- out_one ('R');
+ 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 */
- out_one (cie->return_column); /* Return column */
- out_uleb128 (1); /* Augmentation size */
-#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
- out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+ 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
- out_one (DW_EH_PE_sdata4);
+ 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)
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,
- struct cfi_insn_data *first, int align)
+ 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_add_symbol = end_address;
exp.X_op_symbol = after_size_address;
exp.X_add_number = 0;
- emit_expr (&exp, 4); /* Length */
+ 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);
- exp.X_add_symbol = after_size_address;
- exp.X_op_symbol = cie->start_address;
- emit_expr (&exp, 4); /* CIE offset */
+ if (eh_frame)
+ {
+ exp.X_add_symbol = after_size_address;
+ exp.X_op_symbol = cie->start_address;
+ }
+ else
+ {
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = cie->start_address;
+ exp.X_op_symbol = NULL;
+ }
+ emit_expr (&exp, offset_size); /* CIE offset. */
-#ifdef DIFF_EXPR_OK
- exp.X_add_symbol = fde->start_address;
- exp.X_op_symbol = symbol_temp_new_now ();
- emit_expr (&exp, 4); /* Code offset */
+ if (eh_frame)
+ {
+#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;
- exp.X_op_symbol = NULL;
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = fde->start_address;
+ exp.X_op_symbol = NULL;
#ifdef tc_cfi_emit_pcrel_expr
- tc_cfi_emit_pcrel_expr (&exp, 4); /* Code offset */
+ tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
#else
- emit_expr (&exp, 4); /* Code offset */
+ emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */
#endif
- exp.X_op = O_subtract;
#endif
+ addr_size = DWARF2_FDE_RELOC_SIZE;
+ }
+ else
+ {
+ 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 */
- emit_expr (&exp, 4);
+ exp.X_op_symbol = fde->start_address; /* Code length. */
+ emit_expr (&exp, addr_size);
- out_uleb128 (0); /* Augmentation 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)
output_cfi_insn (first);
- if (align)
- frag_align (align, 0, 0);
+ 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, struct cfi_insn_data **pfirst)
+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 (cie->return_column != fde->return_column)
+ 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)
switch (i->insn)
{
case DW_CFA_advance_loc:
- /* We reached the first advance in the FDE, but did not
- reach the end of the CIE list. */
+ 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:
break;
case CFI_escape:
+ case CFI_val_encoded_addr:
/* Don't bother matching these for now. */
goto fail;
}
/* 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. */
- if (i == cie->last && (!j || j->insn == DW_CFA_advance_loc))
+ 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 = xmalloc (sizeof (struct cie_entry));
+ cie = (struct cie_entry *) xmalloc (sizeof (struct cie_entry));
cie->next = cie_root;
cie_root = cie;
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)
+ 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);
+
+ 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)
+{
+ for (; insn; insn = insn->next)
+ 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) do { } while (0)
+#endif
+
void
cfi_finish (void)
{
struct fde_entry *fde;
int save_flag_traditional_format;
- if (cur_fde_data)
- {
- as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
- cur_fde_data->end_address = cur_fde_data->start_address;
- }
-
if (all_fde_data == 0)
return;
- /* Open .eh_frame section. */
- cfi_seg = subseg_new (".eh_frame", 0);
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, cfi_seg,
- SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY);
+ if ((cfi_sections & CFI_EMIT_eh_frame) != 0)
+ {
+ /* Open .eh_frame section. */
+ cfi_seg = subseg_new (".eh_frame", 0);
+ bfd_set_section_flags (stdoutput, cfi_seg,
+ SEC_ALLOC | SEC_LOAD | SEC_DATA
+ | DWARF2_EH_FRAME_READ_ONLY);
+ subseg_set (cfi_seg, 0);
+ record_alignment (cfi_seg, EH_FRAME_ALIGNMENT);
+
+#ifdef md_fix_up_eh_frame
+ md_fix_up_eh_frame (cfi_seg);
#endif
- subseg_set (cfi_seg, 0);
- record_alignment (cfi_seg, EH_FRAME_ALIGNMENT);
- /* Make sure check_eh_frame doesn't do anything with our output. */
- save_flag_traditional_format = flag_traditional_format;
- flag_traditional_format = 1;
+ /* Make sure check_eh_frame doesn't do anything with our output. */
+ save_flag_traditional_format = flag_traditional_format;
+ flag_traditional_format = 1;
+
+ for (fde = all_fde_data; fde ; fde = fde->next)
+ {
+ struct cfi_insn_data *first;
+ struct cie_entry *cie;
+
+ 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);
+ }
+
+ flag_traditional_format = save_flag_traditional_format;
+ }
- for (fde = all_fde_data; fde ; fde = fde->next)
+ if ((cfi_sections & CFI_EMIT_debug_frame) != 0)
{
- struct cfi_insn_data *first;
- struct cie_entry *cie;
+ struct cie_entry *cie, *cie_next;
+ int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1;
+
+ for (cie = cie_root; cie; cie = cie_next)
+ {
+ cie_next = cie->next;
+ free ((void *) cie);
+ }
+ cie_root = NULL;
+
+ /* Open .debug_frame section. */
+ cfi_seg = subseg_new (".debug_frame", 0);
+ bfd_set_section_flags (stdoutput, cfi_seg,
+ SEC_READONLY | SEC_DEBUGGING);
+ subseg_set (cfi_seg, 0);
+ record_alignment (cfi_seg, alignment);
- cie = select_cie_for_fde (fde, &first);
- output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 0);
+ for (fde = all_fde_data; fde ; fde = fde->next)
+ {
+ struct cfi_insn_data *first;
+
+ 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);
+ cie = select_cie_for_fde (fde, FALSE, &first, alignment);
+ output_fde (fde, cie, FALSE, first, alignment);
+ }
}
+}
- flag_traditional_format = save_flag_traditional_format;
+#else /* TARGET_USE_CFIPOP */
+void
+cfi_finish (void)
+{
}
+#endif /* TARGET_USE_CFIPOP */
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