/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
- Copyright 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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,
#include "as.h"
#include "dw2gencfi.h"
+#include "subsegs.h"
+#ifdef TARGET_USE_CFIPOP
/* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
of the CIE. Default to 1 if not otherwise specified. */
# 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
-#endif
-
#ifndef EH_FRAME_ALIGNMENT
# define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
#endif
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. */
{
struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry));
- cur_fde_data = fde;
+ frchain_now->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;
}
alloc_cfi_insn_data (void)
{
struct cfi_insn_data *insn = 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;
+ 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->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
static void dot_cfi_escape (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);
/* 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
const pseudo_typeS cfi_pseudo_table[] =
{
{ "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 },
{ 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 ();
}
/* 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 ();
}
/* 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;
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 = get_absolute_expression ();
+ if (encoding == DW_EH_PE_omit)
+ {
+ demand_empty_rest_of_line ();
+ fde->per_encoding = encoding;
+ return;
+ }
+
+ if ((encoding & 0xff) != encoding
+ || ((encoding & 0x70) != 0
+#if defined 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 = get_absolute_expression ();
+ if (encoding == DW_EH_PE_omit)
+ {
+ demand_empty_rest_of_line ();
+ fde->lsda_encoding = encoding;
+ return;
+ }
+
+ if ((encoding & 0xff) != encoding
+ || ((encoding & 0x70) != 0
+#if defined 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"));
+ 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_startproc (int ignored ATTRIBUTE_UNUSED)
{
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 ();
}
demand_empty_rest_of_line ();
- cur_cfa_offset = 0;
+ 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 ();
out_one (DW_CFA_advance_loc + scaled);
else if (delta <= 0xFF)
{
- out_one (DW_CFA_advance_loc1);
- out_one (delta);
+ out_one (DW_CFA_advance_loc1);
+ out_one (delta);
}
else if (delta <= 0xFFFF)
{
- out_one (DW_CFA_advance_loc2);
- out_two (delta);
+ out_one (DW_CFA_advance_loc2);
+ out_two (delta);
}
else
{
- out_one (DW_CFA_advance_loc4);
- out_four (delta);
+ out_one (DW_CFA_advance_loc4);
+ out_four (delta);
}
}
else
}
}
+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)
{
symbolS *after_size_address, *end_address;
expressionS exp;
struct cfi_insn_data *i;
+ offsetT augmentation_size;
cie->start_address = symbol_temp_new_now ();
after_size_address = symbol_temp_make ();
out_four (0); /* CIE id. */
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 (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);
else
out_uleb128 (cie->return_column);
- out_uleb128 (1); /* Augmentation size. */
+ 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)
+ {
+#ifdef DIFF_EXPR_OK
+ exp.X_op = O_subtract;
+ exp.X_op_symbol = symbol_temp_new_now ();
+ emit_expr (&exp, size);
+#elif defined (tc_cfi_emit_pcrel_expr)
+ tc_cfi_emit_pcrel_expr (&exp, size);
+#else
+ abort ();
+#endif
+ }
+ else
+ emit_expr (&exp, size);
+ }
+ if (cie->lsda_encoding != DW_EH_PE_omit)
+ out_one (cie->lsda_encoding);
#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4);
#else
{
symbolS *after_size_address, *end_address;
expressionS exp;
+ offsetT augmentation_size;
after_size_address = symbol_temp_make ();
end_address = symbol_temp_make ();
exp.X_op_symbol = cie->start_address;
emit_expr (&exp, 4); /* CIE offset. */
-#ifdef DIFF_EXPR_OK
+#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. */
exp.X_op_symbol = fde->start_address; /* Code length. */
emit_expr (&exp, 4);
- out_uleb128 (0); /* Augmentation size. */
+ augmentation_size = encoding_size (fde->lsda_encoding);
+ 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
+ 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);
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)
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)
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;
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, &first);
output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
}
flag_traditional_format = save_flag_traditional_format;
}
+
+#else /* TARGET_USE_CFIPOP */
+void
+cfi_finish (void)
+{
+}
+#endif /* TARGET_USE_CFIPOP */
projects / binutils.git / blobdiff