/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
- Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+ Free Software Foundation, Inc.
Contributed by Michal Ludvig <mludvig@suse.cz>
This file is part of GAS, the GNU Assembler.
#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
+#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)
+#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)
+#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
+
+#if defined (TE_PE) || defined (TE_PEP)
+#define SUPPORT_FRAME_LINKONCE 1
+#else
+#define SUPPORT_FRAME_LINKONCE 0
+#endif
+
+#if SUPPORT_FRAME_LINKONCE
+#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
+
+/* Private segment collection list. */
+struct dwcfi_seg_list
+{
+ segT seg;
+ int subseg;
+ char * seg_name;
+};
+
+#define FRAME_NAME ".eh_frame"
+
+static struct hash_control *dwcfi_hash;
+
+/* 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;
+
+ if (!seg)
+ name = "";
+ else
+ {
+ const char * dollar;
+ const char * dot;
+
+ name = bfd_get_section_name (stdoutput, seg);
+
+ dollar = strchr (name, '$');
+ dot = strchr (name + 1, '.');
+
+ if (!dollar && !dot)
+ name = "";
+ else if (!dollar)
+ name = dot;
+ else if (!dot)
+ name = dollar;
+ else if (dot < dollar)
+ name = dot;
+ else
+ name = dollar;
+ }
+
+ return 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 = (struct dwcfi_seg_list *)
+ xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name));
+ r->seg = seg;
+ r->subseg = subseg;
+ r->seg_name = name;
+ return r;
+}
+
+static segT
+is_now_linkonce_segment (void)
+{
+ if ((bfd_get_section_flags (stdoutput, 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_get_section_flags (stdoutput, 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 (stdoutput, 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 void
+dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item)
+{
+ const char *error_string;
+
+ if ((error_string = hash_jam (dwcfi_hash, name, (char *) item)))
+ as_fatal (_("Inserting \"%s\" into structure table failed: %s"),
+ name, error_string);
+}
+
+static struct dwcfi_seg_list *
+dwcfi_hash_find (char *name)
+{
+ return (struct dwcfi_seg_list *) 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 = hash_new ();
+
+ 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);
+
+ dwcfi_hash_insert (item->seg_name, item);
+ }
+ else
+ 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 cfi_insn_data
{
struct cfi_insn_data *next;
+#if SUPPORT_FRAME_LINKONCE
+ segT cur_seg;
+#endif
int insn;
- union {
- struct {
+ union
+ {
+ struct
+ {
unsigned reg;
offsetT offset;
} ri;
- struct {
+ struct
+ {
unsigned reg1;
unsigned reg2;
} rr;
unsigned r;
offsetT i;
- struct {
+ struct
+ {
symbolS *lab1;
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;
};
struct fde_entry
{
struct fde_entry *next;
+#if SUPPORT_FRAME_LINKONCE
+ segT cur_seg;
+#endif
symbolS *start_address;
symbolS *end_address;
struct cfi_insn_data *data;
expressionS lsda;
unsigned int return_column;
unsigned int signal_frame;
+#if SUPPORT_FRAME_LINKONCE
+ int handled;
+#endif
};
struct cie_entry
{
struct cie_entry *next;
+#if SUPPORT_FRAME_LINKONCE
+ segT cur_seg;
+#endif
symbolS *start_address;
unsigned int return_column;
unsigned int signal_frame;
struct cfi_insn_data *first, *last;
};
-
/* List of FDE entries. */
+
static struct fde_entry *all_fde_data;
static struct fde_entry **last_fde_data = &all_fde_data;
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));
- frchain_now->frch_cfi_data = xcalloc (1, sizeof (struct frch_cfi_data));
+ 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;
-
+ 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;
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;
-
+ SET_CUR_SEG (insn, is_now_linkonce_segment ());
return insn;
}
/* Construct a new FDE structure that begins at LABEL. */
-void
+void
cfi_new_fde (symbolS *label)
{
struct fde_entry *fde = alloc_fde_entry ();
/* End the currently open FDE. */
-void
+void
cfi_end_fde (symbolS *label)
{
frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
/* Universal functions to store new instructions. */
static void
-cfi_add_CFA_insn(int insn)
+cfi_add_CFA_insn (int insn)
{
struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
{
unsigned int abs_data_align;
- assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
+ 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_insn (DW_CFA_remember_state);
- p = xmalloc (sizeof (*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;
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_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_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_and_evaluate (&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;
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;
}
fde = frchain_now->frch_cfi_data->cur_fde_data;
- encoding = get_absolute_expression ();
+ encoding = cfi_parse_const ();
if (encoding == DW_EH_PE_omit)
{
demand_empty_rest_of_line ();
if ((encoding & 0xff) != encoding
|| ((encoding & 0x70) != 0
-#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
+#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
&& (encoding & 0x70) != DW_EH_PE_pcrel
#endif
)
}
fde = frchain_now->frch_cfi_data->cur_fde_data;
- encoding = get_absolute_expression ();
+ encoding = cfi_parse_const ();
if (encoding == DW_EH_PE_omit)
{
demand_empty_rest_of_line ();
if ((encoding & 0xff) != encoding
|| ((encoding & 0x70) != 0
-#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
+#if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr
&& (encoding & 0x70) != DW_EH_PE_pcrel
#endif
)
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 (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;
+ 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)
{
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 (scaled);
}
- else if (delta <= 0xFFFF)
+ else if (scaled <= 0xFFFF)
{
out_one (DW_CFA_advance_loc2);
- out_two (delta);
+ out_two (scaled);
}
else
{
out_one (DW_CFA_advance_loc4);
- out_four (delta);
+ 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,
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 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. */
+ 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. */
- 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 (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_one (cie->return_column);
else
out_uleb128 (cie->return_column);
- 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)
+ if (eh_frame)
{
- offsetT size = encoding_size (cie->per_encoding);
- out_one (cie->per_encoding);
- exp = cie->personality;
- if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel)
+ 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)
{
-#ifdef DIFF_EXPR_OK
- exp.X_op = O_subtract;
- exp.X_op_symbol = symbol_temp_new_now ();
- emit_expr (&exp, size);
+ 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);
+ tc_cfi_emit_pcrel_expr (&exp, size);
#else
- abort ();
+ abort ();
#endif
+ }
+ else
+ emit_expr (&exp, size);
}
- else
- emit_expr (&exp, size);
+
+ if (cie->lsda_encoding != DW_EH_PE_omit)
+ out_one (cie->lsda_encoding);
}
- if (cie->lsda_encoding != DW_EH_PE_omit)
- out_one (cie->lsda_encoding);
-#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
- out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4);
-#else
- out_one (DW_EH_PE_sdata4);
+
+ 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);
+ {
+ for (i = cie->first; i != cie->last; i = i->next)
+ {
+ if (CUR_SEG (i) != CUR_SEG (cie))
+ continue;
+ output_cfi_insn (i);
+ }
+ }
- frag_align (2, DW_CFA_nop, 0);
+ 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_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);
+ }
-#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)
+ {
+ 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;
- exp.X_op_symbol = NULL;
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = fde->start_address;
#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_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. */
- emit_expr (&exp, 4);
+ exp.X_add_number = 0;
+ emit_expr (&exp, addr_size);
augmentation_size = encoding_size (fde->lsda_encoding);
- out_uleb128 (augmentation_size); /* Augmentation size. */
+ 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)
{
-#ifdef DIFF_EXPR_OK
+#if CFI_DIFF_LSDA_OK
exp.X_op = O_subtract;
exp.X_op_symbol = symbol_temp_new_now ();
emit_expr (&exp, augmentation_size);
}
for (; first; first = first->next)
- output_cfi_insn (first);
+ 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, 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 (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
break;
case CFI_escape:
+ case CFI_val_encoded_addr:
/* Don't bother matching these for now. */
goto fail;
&& (!j
|| j->insn == DW_CFA_advance_loc
|| j->insn == DW_CFA_remember_state
- || j->insn == CFI_escape))
+ || 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;
+ 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;
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_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, 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)
{
- segT cfi_seg;
+ struct cie_entry *cie, *cie_next;
+ segT cfi_seg, ccseg;
struct fde_entry *fde;
- int save_flag_traditional_format;
+ struct cfi_insn_data *first;
+ int save_flag_traditional_format, seek_next_seg;
if (all_fde_data == 0)
return;
- /* Open .eh_frame section. */
- cfi_seg = subseg_new (".eh_frame", 0);
- bfd_set_section_flags (stdoutput, cfi_seg,
- SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY);
- 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;
-
- for (fde = all_fde_data; fde ; fde = fde->next)
+ if ((cfi_sections & CFI_EMIT_eh_frame) != 0)
{
- struct cfi_insn_data *first;
- struct cie_entry *cie;
+ /* Make sure check_eh_frame doesn't do anything with our output. */
+ save_flag_traditional_format = flag_traditional_format;
+ flag_traditional_format = 1;
- if (fde->end_address == NULL)
+ if (!SUPPORT_FRAME_LINKONCE)
{
- as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
- fde->end_address = fde->start_address;
+ /* 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
}
- cie = select_cie_for_fde (fde, &first);
- output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
+ 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;
}
- 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)
{
projects / binutils-gdb.git / blobdiff