diff options
Diffstat (limited to 'binutils-2.17/gas/dw2gencfi.c')
| -rw-r--r-- | binutils-2.17/gas/dw2gencfi.c | 1085 |
1 files changed, 0 insertions, 1085 deletions
diff --git a/binutils-2.17/gas/dw2gencfi.c b/binutils-2.17/gas/dw2gencfi.c deleted file mode 100644 index bfa5d5cf..00000000 --- a/binutils-2.17/gas/dw2gencfi.c +++ /dev/null @@ -1,1085 +0,0 @@ -/* dw2gencfi.c - Support for generating Dwarf2 CFI information. - Copyright 2003, 2004, 2005, 2006 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) - 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" - - -/* 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 - -/* 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 - -#ifndef tc_cfi_frame_initial_instructions -# define tc_cfi_frame_initial_instructions() ((void)0) -#endif - - -struct cfi_insn_data -{ - struct cfi_insn_data *next; - int insn; - union { - struct { - unsigned reg; - offsetT offset; - } ri; - - struct { - unsigned reg1; - unsigned reg2; - } rr; - - unsigned r; - offsetT i; - - struct { - symbolS *lab1; - symbolS *lab2; - } ll; - - struct cfi_escape_data { - struct cfi_escape_data *next; - expressionS exp; - } *esc; - } u; -}; - -struct fde_entry -{ - struct fde_entry *next; - symbolS *start_address; - symbolS *end_address; - struct cfi_insn_data *data; - struct cfi_insn_data **last; - 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; - 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; - -/* List of CIEs so that they could be reused. */ -static struct cie_entry *cie_root; - -/* Stack of old CFI data, for save/restore. */ -struct cfa_save_data -{ - struct cfa_save_data *next; - offsetT cfa_offset; -}; - -static struct cfa_save_data *cfa_save_stack; - -/* 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)); - - cur_fde_data = fde; - *last_fde_data = fde; - last_fde_data = &fde->next; - - fde->last = &fde->data; - fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; - - 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 struct cfi_insn_data * -alloc_cfi_insn_data (void) -{ - struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data)); - - *cur_fde_data->last = insn; - cur_fde_data->last = &insn->next; - - 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; - last_address = label; -} - -/* End the currently open FDE. */ - -void -cfi_end_fde (symbolS *label) -{ - cur_fde_data->end_address = label; - cur_fde_data = NULL; -} - -/* Set the return column for the current FDE. */ - -void -cfi_set_return_column (unsigned regno) -{ - cur_fde_data->return_column = regno; -} - -/* 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 = last_address; - insn->u.ll.lab2 = label; - - last_address = label; -} - -/* Add a DW_CFA_offset record to the CFI data. */ - -void -cfi_add_CFA_offset (unsigned regno, offsetT offset) -{ - unsigned int abs_data_align; - - 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_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); - 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); - 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 = xmalloc (sizeof (*p)); - p->cfa_offset = cur_cfa_offset; - p->next = cfa_save_stack; - 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 = cfa_save_stack; - if (p) - { - cur_cfa_offset = p->cfa_offset; - 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_startproc (int); -static void dot_cfi_endproc (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_startproc", dot_cfi_startproc, 0 }, - { "cfi_endproc", dot_cfi_endproc, 0 }, - { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, - { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, - { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, - { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, - { "cfi_offset", dot_cfi, DW_CFA_offset }, - { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, - { "cfi_register", dot_cfi, DW_CFA_register }, - { "cfi_return_column", dot_cfi, CFI_return_column }, - { "cfi_restore", dot_cfi, DW_CFA_restore }, - { "cfi_undefined", dot_cfi, DW_CFA_undefined }, - { "cfi_same_value", dot_cfi, DW_CFA_same_value }, - { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, - { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, - { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, - { "cfi_escape", dot_cfi_escape, 0 }, - { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, - { NULL, NULL, 0 } - }; - -static void -cfi_parse_separator (void) -{ - SKIP_WHITESPACE (); - if (*input_line_pointer == ',') - input_line_pointer++; - else - as_bad (_("missing separator")); -} - -static unsigned -cfi_parse_reg (void) -{ - int regno; - expressionS exp; - -#ifdef tc_regname_to_dw2regnum - SKIP_WHITESPACE (); - if (is_name_beginner (*input_line_pointer) - || (*input_line_pointer == '%' - && is_name_beginner (*++input_line_pointer))) - { - char *name, c; - - name = input_line_pointer; - c = get_symbol_end (); - - if ((regno = tc_regname_to_dw2regnum (name)) < 0) - { - as_bad (_("bad register expression")); - regno = 0; - } - - *input_line_pointer = c; - return regno; - } -#endif - - expression_and_evaluate (&exp); - switch (exp.X_op) - { - case O_register: - case O_constant: - regno = exp.X_add_number; - break; - - default: - as_bad (_("bad register expression")); - regno = 0; - break; - } - - return regno; -} - -static offsetT -cfi_parse_const (void) -{ - return get_absolute_expression (); -} - -static void -dot_cfi (int arg) -{ - offsetT offset; - unsigned reg1, reg2; - - if (!cur_fde_data) - { - 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 ()) - cfi_add_advance_loc (symbol_temp_new_now ()); - - switch (arg) - { - case DW_CFA_offset: - reg1 = cfi_parse_reg (); - cfi_parse_separator (); - offset = cfi_parse_const (); - cfi_add_CFA_offset (reg1, offset); - break; - - case CFI_rel_offset: - reg1 = cfi_parse_reg (); - cfi_parse_separator (); - offset = cfi_parse_const (); - cfi_add_CFA_offset (reg1, offset - 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 (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: - 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 (!cur_fde_data) - { - 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 ()) - cfi_add_advance_loc (symbol_temp_new_now ()); - - tail = &head; - do - { - e = xmalloc (sizeof (*e)); - do_parse_cons_expression (&e->exp, 1); - *tail = e; - tail = &e->next; - } - while (*input_line_pointer++ == ','); - *tail = NULL; - - insn = alloc_cfi_insn_data (); - insn->insn = CFI_escape; - insn->u.esc = head; - - --input_line_pointer; - demand_empty_rest_of_line (); -} - -static void -dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) -{ - int simple = 0; - - if (cur_fde_data) - { - as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); - ignore_rest_of_line (); - return; - } - - cfi_new_fde (symbol_temp_new_now ()); - - SKIP_WHITESPACE (); - if (is_name_beginner (*input_line_pointer)) - { - char *name, c; - - name = input_line_pointer; - c = get_symbol_end (); - - if (strcmp (name, "simple") == 0) - { - simple = 1; - *input_line_pointer = c; - } - else - input_line_pointer = name; - } - demand_empty_rest_of_line (); - - cur_cfa_offset = 0; - if (!simple) - tc_cfi_frame_initial_instructions (); -} - -static void -dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) -{ - if (! cur_fde_data) - { - 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 (); -} - - -/* Emit a single byte into the current segment. */ - -static inline void -out_one (int byte) -{ - FRAG_APPEND_1_CHAR (byte); -} - -/* Emit a two-byte word into the current segment. */ - -static inline void -out_two (int data) -{ - md_number_to_chars (frag_more (2), data, 2); -} - -/* Emit a four byte word into the current segment. */ - -static inline void -out_four (int data) -{ - md_number_to_chars (frag_more (4), data, 4); -} - -/* Emit an unsigned "little-endian base 128" number. */ - -static void -out_uleb128 (addressT value) -{ - output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); -} - -/* Emit an unsigned "little-endian base 128" number. */ - -static void -out_sleb128 (offsetT value) -{ - output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); -} - -static void -output_cfi_insn (struct cfi_insn_data *insn) -{ - offsetT offset; - unsigned int regno; - - switch (insn->insn) - { - case DW_CFA_advance_loc: - { - symbolS *from = insn->u.ll.lab1; - symbolS *to = insn->u.ll.lab2; - - if (symbol_get_frag (to) == symbol_get_frag (from)) - { - addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); - addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; - - if (scaled <= 0x3F) - out_one (DW_CFA_advance_loc + scaled); - else if (delta <= 0xFF) - { - out_one (DW_CFA_advance_loc1); - out_one (delta); - } - else if (delta <= 0xFFFF) - { - out_one (DW_CFA_advance_loc2); - out_two (delta); - } - else - { - out_one (DW_CFA_advance_loc4); - out_four (delta); - } - } - else - { - expressionS exp; - - exp.X_op = O_subtract; - exp.X_add_symbol = to; - exp.X_op_symbol = from; - exp.X_add_number = 0; - - /* The code in ehopt.c expects that one byte of the encoding - is already allocated to the frag. This comes from the way - that it scans the .eh_frame section looking first for the - .byte DW_CFA_advance_loc4. */ - frag_more (1); - - frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, - make_expr_symbol (&exp), frag_now_fix () - 1, - (char *) frag_now); - } - } - break; - - case DW_CFA_def_cfa: - offset = insn->u.ri.offset; - if (offset < 0) - { - out_one (DW_CFA_def_cfa_sf); - out_uleb128 (insn->u.ri.reg); - out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); - } - else - { - out_one (DW_CFA_def_cfa); - out_uleb128 (insn->u.ri.reg); - out_uleb128 (offset); - } - break; - - case DW_CFA_def_cfa_register: - case DW_CFA_undefined: - case DW_CFA_same_value: - out_one (insn->insn); - out_uleb128 (insn->u.r); - break; - - case DW_CFA_def_cfa_offset: - offset = insn->u.i; - if (offset < 0) - { - out_one (DW_CFA_def_cfa_offset_sf); - out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); - } - else - { - out_one (DW_CFA_def_cfa_offset); - out_uleb128 (offset); - } - break; - - case DW_CFA_restore: - regno = insn->u.r; - if (regno <= 0x3F) - { - out_one (DW_CFA_restore + regno); - } - else - { - out_one (DW_CFA_restore_extended); - out_uleb128 (regno); - } - break; - - case DW_CFA_offset: - regno = insn->u.ri.reg; - offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; - if (offset < 0) - { - out_one (DW_CFA_offset_extended_sf); - out_uleb128 (regno); - out_sleb128 (offset); - } - else if (regno <= 0x3F) - { - out_one (DW_CFA_offset + regno); - out_uleb128 (offset); - } - else - { - out_one (DW_CFA_offset_extended); - out_uleb128 (regno); - out_uleb128 (offset); - } - break; - - case DW_CFA_register: - out_one (DW_CFA_register); - out_uleb128 (insn->u.rr.reg1); - out_uleb128 (insn->u.rr.reg2); - break; - - case DW_CFA_remember_state: - case DW_CFA_restore_state: - out_one (insn->insn); - break; - - case DW_CFA_GNU_window_save: - out_one (DW_CFA_GNU_window_save); - break; - - case CFI_escape: - { - struct cfi_escape_data *e; - for (e = insn->u.esc; e ; e = e->next) - emit_expr (&e->exp, 1); - break; - } - - default: - abort (); - } -} - -static void -output_cie (struct cie_entry *cie) -{ - symbolS *after_size_address, *end_address; - expressionS exp; - struct cfi_insn_data *i; - - 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; - - emit_expr (&exp, 4); /* 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 (cie->signal_frame) - out_one ('S'); - out_one (0); - out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ - out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ - if (DW_CIE_VERSION == 1) /* Return column. */ - out_one (cie->return_column); - else - out_uleb128 (cie->return_column); - 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); -#else - out_one (DW_EH_PE_sdata4); -#endif - - if (cie->first) - for (i = cie->first; i != cie->last; i = i->next) - output_cfi_insn (i); - - frag_align (2, 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) -{ - symbolS *after_size_address, *end_address; - expressionS exp; - - 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; - emit_expr (&exp, 4); /* 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. */ - -#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. */ -#else - 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. */ -#else - emit_expr (&exp, 4); /* Code offset. */ -#endif - exp.X_op = O_subtract; -#endif - - exp.X_add_symbol = fde->end_address; - exp.X_op_symbol = fde->start_address; /* Code length. */ - emit_expr (&exp, 4); - - out_uleb128 (0); /* Augmentation size. */ - - for (; first; first = first->next) - 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) -{ - 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 - || cie->signal_frame != fde->signal_frame) - continue; - for (i = cie->first, j = fde->data; - i != cie->last && j != NULL; - i = i->next, j = j->next) - { - if (i->insn != j->insn) - goto fail; - switch (i->insn) - { - case DW_CFA_advance_loc: - case DW_CFA_remember_state: - /* We reached the first advance/remember in the FDE, - but did not reach the end of the CIE list. */ - goto fail; - - case DW_CFA_offset: - case DW_CFA_def_cfa: - if (i->u.ri.reg != j->u.ri.reg) - goto fail; - if (i->u.ri.offset != j->u.ri.offset) - goto fail; - break; - - case DW_CFA_register: - if (i->u.rr.reg1 != j->u.rr.reg1) - goto fail; - if (i->u.rr.reg2 != j->u.rr.reg2) - goto fail; - break; - - case DW_CFA_def_cfa_register: - case DW_CFA_restore: - case DW_CFA_undefined: - case DW_CFA_same_value: - if (i->u.r != j->u.r) - goto fail; - break; - - case DW_CFA_def_cfa_offset: - if (i->u.i != j->u.i) - goto fail; - break; - - case CFI_escape: - /* Don't bother matching these for now. */ - goto fail; - - default: - abort (); - } - } - - /* Success if we reached the end of the CIE list, and we've either - run out of FDE entries or we've encountered an advance, - remember, or escape. */ - if (i == cie->last - && (!j - || j->insn == DW_CFA_advance_loc - || j->insn == DW_CFA_remember_state - || j->insn == CFI_escape)) - { - *pfirst = j; - return cie; - } - - fail:; - } - - cie = 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->first = fde->data; - - for (i = cie->first; i ; i = i->next) - if (i->insn == DW_CFA_advance_loc - || i->insn == DW_CFA_remember_state - || i->insn == CFI_escape) - break; - - cie->last = i; - *pfirst = i; - - output_cie (cie); - - return cie; -} - -void -cfi_finish (void) -{ - segT cfi_seg; - 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); - 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) - { - struct cfi_insn_data *first; - struct cie_entry *cie; - - 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; -} |