| /* dw2gencfi.c - Support for generating Dwarf2 CFI information. |
| Copyright (C) 2003-2024 Free Software Foundation, Inc. |
| Contributed by Michal Ludvig <mludvig@suse.cz> |
| |
| This file is part of GAS, the GNU Assembler. |
| |
| GAS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GAS is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GAS; see the file COPYING. If not, write to the Free |
| Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 02110-1301, USA. */ |
| |
| #include "as.h" |
| #include "dw2gencfi.h" |
| #include "subsegs.h" |
| #include "dwarf2dbg.h" |
| #include "gen-sframe.h" |
| |
| #ifdef TARGET_USE_CFIPOP |
| |
| /* By default, use difference expressions if DIFF_EXPR_OK is defined. */ |
| #ifndef CFI_DIFF_EXPR_OK |
| # ifdef DIFF_EXPR_OK |
| # define CFI_DIFF_EXPR_OK 1 |
| # else |
| # define CFI_DIFF_EXPR_OK 0 |
| # endif |
| #endif |
| |
| #ifndef CFI_DIFF_LSDA_OK |
| #define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK |
| #endif |
| |
| #if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0 |
| # error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK" |
| #endif |
| |
| /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field |
| of the CIE. Default to 1 if not otherwise specified. */ |
| #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
| #define DWARF2_LINE_MIN_INSN_LENGTH 1 |
| #endif |
| |
| /* By default, use 32-bit relocations from .eh_frame into .text. */ |
| #ifndef DWARF2_FDE_RELOC_SIZE |
| #define DWARF2_FDE_RELOC_SIZE 4 |
| #endif |
| |
| /* By default, use a read-only .eh_frame section. */ |
| #ifndef DWARF2_EH_FRAME_READ_ONLY |
| #define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY |
| #endif |
| |
| #ifndef EH_FRAME_ALIGNMENT |
| #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) |
| #endif |
| |
| #define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh \ |
| || TARGET_MULTIPLE_EH_FRAME_SECTIONS) |
| |
| #ifndef DWARF2_FORMAT |
| #define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
| #endif |
| |
| #ifndef DWARF2_ADDR_SIZE |
| #define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
| #endif |
| |
| #if MULTIPLE_FRAME_SECTIONS |
| #define CUR_SEG(structp) structp->cur_seg |
| #define SET_CUR_SEG(structp, seg) structp->cur_seg = seg |
| #define HANDLED(structp) structp->handled |
| #define SET_HANDLED(structp, val) structp->handled = val |
| #else |
| #define CUR_SEG(structp) NULL |
| #define SET_CUR_SEG(structp, seg) (void) (0 && seg) |
| #define HANDLED(structp) 0 |
| #define SET_HANDLED(structp, val) (void) (0 && val) |
| #endif |
| |
| #ifndef tc_cfi_reloc_for_encoding |
| #define tc_cfi_reloc_for_encoding(e) BFD_RELOC_NONE |
| #endif |
| |
| /* Targets which support SFrame format will define this and return true. */ |
| #ifndef support_sframe_p |
| # define support_sframe_p() false |
| #endif |
| |
| /* Private segment collection list. */ |
| struct dwcfi_seg_list |
| { |
| segT seg; |
| int subseg; |
| char * seg_name; |
| }; |
| |
| #ifdef SUPPORT_COMPACT_EH |
| static bool compact_eh; |
| #else |
| #define compact_eh 0 |
| #endif |
| |
| static htab_t dwcfi_hash; |
| |
| /* Emit a single byte into the current segment. */ |
| |
| static inline void |
| out_one (int byte) |
| { |
| FRAG_APPEND_1_CHAR (byte); |
| } |
| |
| /* Emit a two-byte word into the current segment. */ |
| |
| static inline void |
| out_two (int data) |
| { |
| md_number_to_chars (frag_more (2), data, 2); |
| } |
| |
| /* Emit a four byte word into the current segment. */ |
| |
| static inline void |
| out_four (int data) |
| { |
| md_number_to_chars (frag_more (4), data, 4); |
| } |
| |
| /* Emit an unsigned "little-endian base 128" number. */ |
| |
| static void |
| out_uleb128 (addressT value) |
| { |
| output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
| } |
| |
| /* Emit an unsigned "little-endian base 128" number. */ |
| |
| static void |
| out_sleb128 (offsetT value) |
| { |
| output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
| } |
| |
| static unsigned int |
| encoding_size (unsigned char encoding) |
| { |
| if (encoding == DW_EH_PE_omit) |
| return 0; |
| switch (encoding & 0x7) |
| { |
| case 0: |
| return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4; |
| case DW_EH_PE_udata2: |
| return 2; |
| case DW_EH_PE_udata4: |
| return 4; |
| case DW_EH_PE_udata8: |
| return 8; |
| default: |
| abort (); |
| } |
| } |
| |
| /* Emit expression EXP in ENCODING. If EMIT_ENCODING is true, first |
| emit a byte containing ENCODING. */ |
| |
| static void |
| emit_expr_encoded (expressionS *exp, int encoding, bool emit_encoding) |
| { |
| unsigned int size = encoding_size (encoding); |
| bfd_reloc_code_real_type code; |
| |
| if (encoding == DW_EH_PE_omit) |
| return; |
| |
| if (emit_encoding) |
| out_one (encoding); |
| |
| code = tc_cfi_reloc_for_encoding (encoding); |
| if (code != BFD_RELOC_NONE) |
| { |
| reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code); |
| char *p = frag_more (size); |
| gas_assert (size == (unsigned) howto->bitsize / 8); |
| md_number_to_chars (p, 0, size); |
| fix_new (frag_now, p - frag_now->fr_literal, size, exp->X_add_symbol, |
| exp->X_add_number, howto->pc_relative, code); |
| } |
| else if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| { |
| #if CFI_DIFF_EXPR_OK |
| expressionS tmp = *exp; |
| tmp.X_op = O_subtract; |
| tmp.X_op_symbol = symbol_temp_new_now (); |
| emit_expr (&tmp, size); |
| #elif defined (tc_cfi_emit_pcrel_expr) |
| tc_cfi_emit_pcrel_expr (exp, size); |
| #else |
| abort (); |
| #endif |
| } |
| else |
| emit_expr (exp, size); |
| } |
| |
| /* Build based on segment the derived .debug_... |
| segment name containing origin segment's postfix name part. */ |
| |
| static char * |
| get_debugseg_name (segT seg, const char *base_name) |
| { |
| const char * name; |
| const char * dollar; |
| const char * dot; |
| |
| if (!seg |
| || (name = bfd_section_name (seg)) == NULL |
| || *name == 0) |
| return notes_strdup (base_name); |
| |
| dollar = strchr (name, '$'); |
| dot = strchr (name + 1, '.'); |
| |
| if (!dollar && !dot) |
| { |
| if (!strcmp (base_name, ".eh_frame_entry") |
| && strcmp (name, ".text") != 0) |
| return notes_concat (base_name, ".", name, NULL); |
| |
| name = ""; |
| } |
| else if (!dollar) |
| name = dot; |
| else if (!dot) |
| name = dollar; |
| else if (dot < dollar) |
| name = dot; |
| else |
| name = dollar; |
| |
| return notes_concat (base_name, name, NULL); |
| } |
| |
| /* Allocate a dwcfi_seg_list structure. */ |
| |
| static struct dwcfi_seg_list * |
| alloc_debugseg_item (segT seg, int subseg, char *name) |
| { |
| struct dwcfi_seg_list *r; |
| |
| r = notes_alloc (sizeof (*r) + strlen (name)); |
| r->seg = seg; |
| r->subseg = subseg; |
| r->seg_name = name; |
| return r; |
| } |
| |
| static segT |
| is_now_linkonce_segment (void) |
| { |
| if (compact_eh) |
| return now_seg; |
| |
| if (TARGET_MULTIPLE_EH_FRAME_SECTIONS) |
| return now_seg; |
| |
| if ((bfd_section_flags (now_seg) |
| & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
| | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0) |
| return now_seg; |
| return NULL; |
| } |
| |
| /* Generate debug... segment with same linkonce properties |
| of based segment. */ |
| |
| static segT |
| make_debug_seg (segT cseg, char *name, int sflags) |
| { |
| segT save_seg = now_seg; |
| int save_subseg = now_subseg; |
| segT r; |
| flagword flags; |
| |
| r = subseg_new (name, 0); |
| |
| /* Check if code segment is marked as linked once. */ |
| if (!cseg) |
| flags = 0; |
| else |
| flags = (bfd_section_flags (cseg) |
| & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD |
| | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE |
| | SEC_LINK_DUPLICATES_SAME_CONTENTS)); |
| |
| /* Add standard section flags. */ |
| flags |= sflags; |
| |
| /* Apply possibly linked once flags to new generated segment, too. */ |
| if (!bfd_set_section_flags (r, flags)) |
| as_bad (_("bfd_set_section_flags: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| |
| /* Restore to previous segment. */ |
| if (save_seg != NULL) |
| subseg_set (save_seg, save_subseg); |
| return r; |
| } |
| |
| static struct dwcfi_seg_list * |
| dwcfi_hash_find (char *name) |
| { |
| return (struct dwcfi_seg_list *) str_hash_find (dwcfi_hash, name); |
| } |
| |
| static struct dwcfi_seg_list * |
| dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags) |
| { |
| struct dwcfi_seg_list *item; |
| char *name; |
| |
| /* Initialize dwcfi_hash once. */ |
| if (!dwcfi_hash) |
| dwcfi_hash = str_htab_create (); |
| |
| name = get_debugseg_name (cseg, base_name); |
| |
| item = dwcfi_hash_find (name); |
| if (!item) |
| { |
| item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name); |
| |
| str_hash_insert (dwcfi_hash, item->seg_name, item, 0); |
| } |
| else |
| notes_free (name); |
| |
| return item; |
| } |
| |
| /* ??? Share this with dwarf2cfg.c. */ |
| #ifndef TC_DWARF2_EMIT_OFFSET |
| #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
| |
| /* Create an offset to .dwarf2_*. */ |
| |
| static void |
| generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
| { |
| expressionS exp; |
| |
| exp.X_op = O_symbol; |
| exp.X_add_symbol = symbol; |
| exp.X_add_number = 0; |
| emit_expr (&exp, size); |
| } |
| #endif |
| |
| struct cfi_escape_data |
| { |
| struct cfi_escape_data *next; |
| expressionS exp; |
| }; |
| |
| struct cie_entry |
| { |
| struct cie_entry *next; |
| #if MULTIPLE_FRAME_SECTIONS |
| segT cur_seg; |
| #endif |
| symbolS *start_address; |
| unsigned int return_column; |
| unsigned int signal_frame; |
| unsigned char fde_encoding; |
| unsigned char per_encoding; |
| unsigned char lsda_encoding; |
| expressionS personality; |
| #ifdef tc_cie_entry_extras |
| tc_cie_entry_extras |
| #endif |
| struct cfi_insn_data *first, *last; |
| }; |
| |
| /* List of FDE entries. */ |
| |
| struct fde_entry *all_fde_data; |
| static struct fde_entry **last_fde_data = &all_fde_data; |
| |
| /* List of CIEs so that they could be reused. */ |
| static struct cie_entry *cie_root; |
| |
| /* Construct a new FDE structure and add it to the end of the fde list. */ |
| |
| static struct fde_entry * |
| alloc_fde_entry (void) |
| { |
| struct fde_entry *fde = XCNEW (struct fde_entry); |
| |
| frchain_now->frch_cfi_data = XCNEW (struct frch_cfi_data); |
| frchain_now->frch_cfi_data->cur_fde_data = fde; |
| *last_fde_data = fde; |
| last_fde_data = &fde->next; |
| SET_CUR_SEG (fde, is_now_linkonce_segment ()); |
| SET_HANDLED (fde, 0); |
| fde->last = &fde->data; |
| fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; |
| fde->per_encoding = DW_EH_PE_omit; |
| fde->lsda_encoding = DW_EH_PE_omit; |
| fde->eh_header_type = EH_COMPACT_UNKNOWN; |
| #ifdef tc_fde_entry_init_extra |
| tc_fde_entry_init_extra (fde) |
| #endif |
| |
| return fde; |
| } |
| |
| /* The following functions are available for a backend to construct its |
| own unwind information, usually from legacy unwind directives. */ |
| |
| /* Construct a new INSN structure and add it to the end of the insn list |
| for the currently active FDE. */ |
| |
| static bool cfi_sections_set = false; |
| static int cfi_sections = CFI_EMIT_eh_frame; |
| int all_cfi_sections = 0; |
| static struct fde_entry *last_fde; |
| |
| static struct cfi_insn_data * |
| alloc_cfi_insn_data (void) |
| { |
| struct cfi_insn_data *insn = XCNEW (struct cfi_insn_data); |
| struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data; |
| |
| *cur_fde_data->last = insn; |
| cur_fde_data->last = &insn->next; |
| SET_CUR_SEG (insn, is_now_linkonce_segment ()); |
| return insn; |
| } |
| |
| /* Construct a new FDE structure that begins at LABEL. */ |
| |
| void |
| cfi_new_fde (symbolS *label) |
| { |
| struct fde_entry *fde = alloc_fde_entry (); |
| fde->start_address = label; |
| frchain_now->frch_cfi_data->last_address = label; |
| } |
| |
| /* End the currently open FDE. */ |
| |
| void |
| cfi_end_fde (symbolS *label) |
| { |
| frchain_now->frch_cfi_data->cur_fde_data->end_address = label; |
| free (frchain_now->frch_cfi_data); |
| frchain_now->frch_cfi_data = NULL; |
| } |
| |
| /* Set the last FDE .*/ |
| void |
| cfi_set_last_fde (struct fde_entry *fde) |
| { |
| last_fde = fde; |
| } |
| |
| /* Set the return column for the current FDE. */ |
| |
| void |
| cfi_set_return_column (unsigned regno) |
| { |
| frchain_now->frch_cfi_data->cur_fde_data->return_column = regno; |
| } |
| |
| void |
| cfi_set_sections (void) |
| { |
| all_cfi_sections |= cfi_sections; |
| frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections; |
| cfi_sections_set = true; |
| } |
| |
| /* Universal functions to store new instructions. */ |
| |
| static void |
| cfi_add_CFA_insn (int insn) |
| { |
| struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| |
| insn_ptr->insn = insn; |
| } |
| |
| static void |
| cfi_add_CFA_insn_reg (int insn, unsigned regno) |
| { |
| struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| |
| insn_ptr->insn = insn; |
| insn_ptr->u.r = regno; |
| } |
| |
| static void |
| cfi_add_CFA_insn_offset (int insn, offsetT offset) |
| { |
| struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| |
| insn_ptr->insn = insn; |
| insn_ptr->u.i = offset; |
| } |
| |
| static void |
| cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) |
| { |
| struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| |
| insn_ptr->insn = insn; |
| insn_ptr->u.rr.reg1 = reg1; |
| insn_ptr->u.rr.reg2 = reg2; |
| } |
| |
| static void |
| cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) |
| { |
| struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); |
| |
| insn_ptr->insn = insn; |
| insn_ptr->u.ri.reg = regno; |
| insn_ptr->u.ri.offset = offset; |
| } |
| |
| /* Add a CFI insn to advance the PC from the last address to LABEL. */ |
| |
| void |
| cfi_add_advance_loc (symbolS *label) |
| { |
| struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
| |
| insn->insn = DW_CFA_advance_loc; |
| insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address; |
| insn->u.ll.lab2 = label; |
| |
| frchain_now->frch_cfi_data->last_address = label; |
| } |
| |
| /* Add a CFI insn to label the current position in the CFI segment. */ |
| |
| void |
| cfi_add_label (const char *name) |
| { |
| unsigned int len = strlen (name) + 1; |
| struct cfi_insn_data *insn = alloc_cfi_insn_data (); |
| |
| insn->insn = CFI_label; |
| obstack_grow (¬es, name, len); |
| insn->u.sym_name = (char *) obstack_finish (¬es); |
| } |
| |
| /* Add a DW_CFA_offset record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_offset (unsigned regno, offsetT offset) |
| { |
| unsigned int abs_data_align; |
| |
| gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
| cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); |
| |
| abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
| ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
| if (offset % abs_data_align) |
| as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
| } |
| |
| /* Add a DW_CFA_val_offset record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_val_offset (unsigned regno, offsetT offset) |
| { |
| unsigned int abs_data_align; |
| |
| gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); |
| cfi_add_CFA_insn_reg_offset (DW_CFA_val_offset, regno, offset); |
| |
| abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 |
| ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); |
| if (offset % abs_data_align) |
| as_bad (_("register save offset not a multiple of %u"), abs_data_align); |
| } |
| |
| /* Add a DW_CFA_def_cfa record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) |
| { |
| cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); |
| frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| } |
| |
| /* Add a DW_CFA_register record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_register (unsigned reg1, unsigned reg2) |
| { |
| cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); |
| } |
| |
| /* Add a DW_CFA_def_cfa_register record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_def_cfa_register (unsigned regno) |
| { |
| cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); |
| } |
| |
| /* Add a DW_CFA_def_cfa_offset record to the CFI data. */ |
| |
| void |
| cfi_add_CFA_def_cfa_offset (offsetT offset) |
| { |
| cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); |
| frchain_now->frch_cfi_data->cur_cfa_offset = offset; |
| } |
| |
| void |
| cfi_add_CFA_restore (unsigned regno) |
| { |
| cfi_add_CFA_insn_reg (DW_CFA_restore, regno); |
| } |
| |
| void |
| cfi_add_CFA_undefined (unsigned regno) |
| { |
| cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); |
| } |
| |
| void |
| cfi_add_CFA_same_value (unsigned regno) |
| { |
| cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); |
| } |
| |
| void |
| cfi_add_CFA_remember_state (void) |
| { |
| struct cfa_save_data *p; |
| |
| cfi_add_CFA_insn (DW_CFA_remember_state); |
| |
| p = XNEW (struct cfa_save_data); |
| p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset; |
| p->next = frchain_now->frch_cfi_data->cfa_save_stack; |
| frchain_now->frch_cfi_data->cfa_save_stack = p; |
| } |
| |
| void |
| cfi_add_CFA_restore_state (void) |
| { |
| struct cfa_save_data *p; |
| |
| cfi_add_CFA_insn (DW_CFA_restore_state); |
| |
| p = frchain_now->frch_cfi_data->cfa_save_stack; |
| if (p) |
| { |
| frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset; |
| frchain_now->frch_cfi_data->cfa_save_stack = p->next; |
| free (p); |
| } |
| else |
| as_bad (_("CFI state restore without previous remember")); |
| } |
| |
| |
| /* Parse CFI assembler directives. */ |
| |
| static void dot_cfi (int); |
| static void dot_cfi_escape (int); |
| static void dot_cfi_startproc (int); |
| static void dot_cfi_endproc (int); |
| static void dot_cfi_fde_data (int); |
| static void dot_cfi_personality (int); |
| static void dot_cfi_personality_id (int); |
| static void dot_cfi_lsda (int); |
| static void dot_cfi_val_encoded_addr (int); |
| static void dot_cfi_inline_lsda (int); |
| static void dot_cfi_label (int); |
| |
| const pseudo_typeS cfi_pseudo_table[] = |
| { |
| { "cfi_sections", dot_cfi_sections, 0 }, |
| { "cfi_startproc", dot_cfi_startproc, 0 }, |
| { "cfi_endproc", dot_cfi_endproc, 0 }, |
| { "cfi_fde_data", dot_cfi_fde_data, 0 }, |
| { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, |
| { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, |
| { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, |
| { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, |
| { "cfi_offset", dot_cfi, DW_CFA_offset }, |
| { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, |
| { "cfi_register", dot_cfi, DW_CFA_register }, |
| { "cfi_return_column", dot_cfi, CFI_return_column }, |
| { "cfi_restore", dot_cfi, DW_CFA_restore }, |
| { "cfi_undefined", dot_cfi, DW_CFA_undefined }, |
| { "cfi_same_value", dot_cfi, DW_CFA_same_value }, |
| { "cfi_remember_state", dot_cfi, DW_CFA_remember_state }, |
| { "cfi_restore_state", dot_cfi, DW_CFA_restore_state }, |
| { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, |
| { "cfi_negate_ra_state", dot_cfi, DW_CFA_AARCH64_negate_ra_state }, |
| { "cfi_escape", dot_cfi_escape, 0 }, |
| { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, |
| { "cfi_personality", dot_cfi_personality, 0 }, |
| { "cfi_personality_id", dot_cfi_personality_id, 0 }, |
| { "cfi_lsda", dot_cfi_lsda, 0 }, |
| { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 }, |
| { "cfi_inline_lsda", dot_cfi_inline_lsda, 0 }, |
| { "cfi_label", dot_cfi_label, 0 }, |
| { "cfi_val_offset", dot_cfi, DW_CFA_val_offset }, |
| { NULL, NULL, 0 } |
| }; |
| |
| static void |
| cfi_parse_separator (void) |
| { |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer == ',') |
| input_line_pointer++; |
| else |
| as_bad (_("missing separator")); |
| } |
| |
| #ifndef tc_parse_to_dw2regnum |
| static void |
| tc_parse_to_dw2regnum (expressionS *exp) |
| { |
| # ifdef tc_regname_to_dw2regnum |
| SKIP_WHITESPACE (); |
| if (is_name_beginner (*input_line_pointer) |
| || (*input_line_pointer == '%' |
| && is_name_beginner (*++input_line_pointer))) |
| { |
| char *name, c; |
| |
| c = get_symbol_name (& name); |
| |
| exp->X_op = O_constant; |
| exp->X_add_number = tc_regname_to_dw2regnum (name); |
| |
| restore_line_pointer (c); |
| } |
| else |
| # endif |
| expression_and_evaluate (exp); |
| } |
| #endif |
| |
| static unsigned |
| cfi_parse_reg (void) |
| { |
| int regno; |
| expressionS exp; |
| |
| tc_parse_to_dw2regnum (&exp); |
| switch (exp.X_op) |
| { |
| case O_register: |
| case O_constant: |
| regno = exp.X_add_number; |
| break; |
| |
| default: |
| regno = -1; |
| break; |
| } |
| |
| if (regno < 0) |
| { |
| as_bad (_("bad register expression")); |
| regno = 0; |
| } |
| |
| return regno; |
| } |
| |
| static offsetT |
| cfi_parse_const (void) |
| { |
| return get_absolute_expression (); |
| } |
| |
| static void |
| dot_cfi (int arg) |
| { |
| offsetT offset; |
| unsigned reg1, reg2; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| /* If the last address was not at the current PC, advance to current. */ |
| if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| != frag_now_fix ())) |
| cfi_add_advance_loc (symbol_temp_new_now ()); |
| |
| switch (arg) |
| { |
| case DW_CFA_offset: |
| reg1 = cfi_parse_reg (); |
| cfi_parse_separator (); |
| offset = cfi_parse_const (); |
| cfi_add_CFA_offset (reg1, offset); |
| break; |
| |
| case DW_CFA_val_offset: |
| reg1 = cfi_parse_reg (); |
| cfi_parse_separator (); |
| offset = cfi_parse_const (); |
| cfi_add_CFA_val_offset (reg1, offset); |
| break; |
| |
| case CFI_rel_offset: |
| reg1 = cfi_parse_reg (); |
| cfi_parse_separator (); |
| offset = cfi_parse_const (); |
| cfi_add_CFA_offset (reg1, |
| offset - frchain_now->frch_cfi_data->cur_cfa_offset); |
| break; |
| |
| case DW_CFA_def_cfa: |
| reg1 = cfi_parse_reg (); |
| cfi_parse_separator (); |
| offset = cfi_parse_const (); |
| cfi_add_CFA_def_cfa (reg1, offset); |
| break; |
| |
| case DW_CFA_register: |
| reg1 = cfi_parse_reg (); |
| cfi_parse_separator (); |
| reg2 = cfi_parse_reg (); |
| cfi_add_CFA_register (reg1, reg2); |
| break; |
| |
| case DW_CFA_def_cfa_register: |
| reg1 = cfi_parse_reg (); |
| cfi_add_CFA_def_cfa_register (reg1); |
| break; |
| |
| case DW_CFA_def_cfa_offset: |
| offset = cfi_parse_const (); |
| cfi_add_CFA_def_cfa_offset (offset); |
| break; |
| |
| case CFI_adjust_cfa_offset: |
| offset = cfi_parse_const (); |
| cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset |
| + offset); |
| break; |
| |
| case DW_CFA_restore: |
| for (;;) |
| { |
| reg1 = cfi_parse_reg (); |
| cfi_add_CFA_restore (reg1); |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| break; |
| ++input_line_pointer; |
| } |
| break; |
| |
| case DW_CFA_undefined: |
| for (;;) |
| { |
| reg1 = cfi_parse_reg (); |
| cfi_add_CFA_undefined (reg1); |
| SKIP_WHITESPACE (); |
| if (*input_line_pointer != ',') |
| break; |
| ++input_line_pointer; |
| } |
| break; |
| |
| case DW_CFA_same_value: |
| reg1 = cfi_parse_reg (); |
| cfi_add_CFA_same_value (reg1); |
| break; |
| |
| case CFI_return_column: |
| reg1 = cfi_parse_reg (); |
| cfi_set_return_column (reg1); |
| break; |
| |
| case DW_CFA_remember_state: |
| cfi_add_CFA_remember_state (); |
| break; |
| |
| case DW_CFA_restore_state: |
| cfi_add_CFA_restore_state (); |
| break; |
| |
| case DW_CFA_GNU_window_save: |
| cfi_add_CFA_insn (DW_CFA_GNU_window_save); |
| break; |
| |
| case CFI_signal_frame: |
| frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1; |
| break; |
| |
| default: |
| abort (); |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) |
| { |
| struct cfi_escape_data *head, **tail, *e; |
| struct cfi_insn_data *insn; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| /* If the last address was not at the current PC, advance to current. */ |
| if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| != frag_now_fix ())) |
| cfi_add_advance_loc (symbol_temp_new_now ()); |
| |
| tail = &head; |
| do |
| { |
| e = XNEW (struct cfi_escape_data); |
| do_parse_cons_expression (&e->exp, 1); |
| *tail = e; |
| tail = &e->next; |
| } |
| while (*input_line_pointer++ == ','); |
| *tail = NULL; |
| |
| insn = alloc_cfi_insn_data (); |
| insn->insn = CFI_escape; |
| insn->u.esc = head; |
| |
| --input_line_pointer; |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_personality (int ignored ATTRIBUTE_UNUSED) |
| { |
| struct fde_entry *fde; |
| offsetT encoding; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| fde = frchain_now->frch_cfi_data->cur_fde_data; |
| encoding = cfi_parse_const (); |
| if (encoding == DW_EH_PE_omit) |
| { |
| demand_empty_rest_of_line (); |
| fde->per_encoding = encoding; |
| return; |
| } |
| |
| if ((encoding & 0xff) != encoding |
| || ((((encoding & 0x70) != 0 |
| #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| && (encoding & 0x70) != DW_EH_PE_pcrel |
| #endif |
| ) |
| /* leb128 can be handled, but does something actually need it? */ |
| || (encoding & 7) == DW_EH_PE_uleb128 |
| || (encoding & 7) > DW_EH_PE_udata8) |
| && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE)) |
| { |
| as_bad (_("invalid or unsupported encoding in .cfi_personality")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| if (*input_line_pointer++ != ',') |
| { |
| as_bad (_(".cfi_personality requires encoding and symbol arguments")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| expression_and_evaluate (&fde->personality); |
| switch (fde->personality.X_op) |
| { |
| case O_symbol: |
| break; |
| case O_constant: |
| if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| encoding = DW_EH_PE_omit; |
| break; |
| default: |
| encoding = DW_EH_PE_omit; |
| break; |
| } |
| |
| fde->per_encoding = encoding; |
| |
| if (encoding == DW_EH_PE_omit) |
| { |
| as_bad (_("wrong second argument to .cfi_personality")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED) |
| { |
| struct fde_entry *fde; |
| offsetT encoding; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| fde = frchain_now->frch_cfi_data->cur_fde_data; |
| encoding = cfi_parse_const (); |
| if (encoding == DW_EH_PE_omit) |
| { |
| demand_empty_rest_of_line (); |
| fde->lsda_encoding = encoding; |
| return; |
| } |
| |
| if ((encoding & 0xff) != encoding |
| || ((((encoding & 0x70) != 0 |
| #if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr |
| && (encoding & 0x70) != DW_EH_PE_pcrel |
| #endif |
| ) |
| /* leb128 can be handled, but does something actually need it? */ |
| || (encoding & 7) == DW_EH_PE_uleb128 |
| || (encoding & 7) > DW_EH_PE_udata8) |
| && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE)) |
| { |
| as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| if (*input_line_pointer++ != ',') |
| { |
| as_bad (_(".cfi_lsda requires encoding and symbol arguments")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| fde->lsda_encoding = encoding; |
| |
| expression_and_evaluate (&fde->lsda); |
| switch (fde->lsda.X_op) |
| { |
| case O_symbol: |
| break; |
| case O_constant: |
| if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| encoding = DW_EH_PE_omit; |
| break; |
| default: |
| encoding = DW_EH_PE_omit; |
| break; |
| } |
| |
| fde->lsda_encoding = encoding; |
| |
| if (encoding == DW_EH_PE_omit) |
| { |
| as_bad (_("wrong second argument to .cfi_lsda")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED) |
| { |
| struct cfi_insn_data *insn_ptr; |
| offsetT encoding; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| /* If the last address was not at the current PC, advance to current. */ |
| if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| != frag_now_fix ())) |
| cfi_add_advance_loc (symbol_temp_new_now ()); |
| |
| insn_ptr = alloc_cfi_insn_data (); |
| insn_ptr->insn = CFI_val_encoded_addr; |
| |
| insn_ptr->u.ea.reg = cfi_parse_reg (); |
| |
| cfi_parse_separator (); |
| encoding = cfi_parse_const (); |
| if ((encoding & 0xff) != encoding |
| || ((encoding & 0x70) != 0 |
| #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| && (encoding & 0x70) != DW_EH_PE_pcrel |
| #endif |
| ) |
| /* leb128 can be handled, but does something actually need it? */ |
| || (encoding & 7) == DW_EH_PE_uleb128 |
| || (encoding & 7) > DW_EH_PE_udata8) |
| { |
| as_bad (_("invalid or unsupported encoding in .cfi_lsda")); |
| encoding = DW_EH_PE_omit; |
| } |
| |
| cfi_parse_separator (); |
| expression_and_evaluate (&insn_ptr->u.ea.exp); |
| switch (insn_ptr->u.ea.exp.X_op) |
| { |
| case O_symbol: |
| break; |
| case O_constant: |
| if ((encoding & 0x70) != DW_EH_PE_pcrel) |
| break; |
| /* Fall through. */ |
| default: |
| encoding = DW_EH_PE_omit; |
| break; |
| } |
| |
| insn_ptr->u.ea.encoding = encoding; |
| if (encoding == DW_EH_PE_omit) |
| { |
| as_bad (_("wrong third argument to .cfi_val_encoded_addr")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_label (int ignored ATTRIBUTE_UNUSED) |
| { |
| char *name; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| name = read_symbol_name (); |
| if (name == NULL) |
| return; |
| |
| /* If the last address was not at the current PC, advance to current. */ |
| if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now |
| || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address) |
| != frag_now_fix ())) |
| cfi_add_advance_loc (symbol_temp_new_now ()); |
| |
| cfi_add_label (name); |
| free (name); |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| void |
| dot_cfi_sections (int ignored ATTRIBUTE_UNUSED) |
| { |
| int sections = 0; |
| |
| SKIP_WHITESPACE (); |
| if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"') |
| while (1) |
| { |
| char * saved_ilp; |
| char *name, c; |
| |
| saved_ilp = input_line_pointer; |
| c = get_symbol_name (& name); |
| |
| if (startswith (name, ".eh_frame") |
| && name[9] != '_') |
| sections |= CFI_EMIT_eh_frame; |
| else if (startswith (name, ".debug_frame")) |
| sections |= CFI_EMIT_debug_frame; |
| #if SUPPORT_COMPACT_EH |
| else if (startswith (name, ".eh_frame_entry")) |
| { |
| compact_eh = true; |
| sections |= CFI_EMIT_eh_frame_compact; |
| } |
| #endif |
| #ifdef tc_cfi_section_name |
| else if (strcmp (name, tc_cfi_section_name) == 0) |
| sections |= CFI_EMIT_target; |
| #endif |
| else if (startswith (name, ".sframe")) |
| sections |= CFI_EMIT_sframe; |
| else |
| { |
| *input_line_pointer = c; |
| input_line_pointer = saved_ilp; |
| break; |
| } |
| |
| *input_line_pointer = c; |
| SKIP_WHITESPACE_AFTER_NAME (); |
| if (*input_line_pointer == ',') |
| { |
| name = input_line_pointer++; |
| SKIP_WHITESPACE (); |
| if (!is_name_beginner (*input_line_pointer) |
| && *input_line_pointer != '"') |
| { |
| input_line_pointer = name; |
| break; |
| } |
| } |
| else if (is_name_beginner (*input_line_pointer) |
| || *input_line_pointer == '"') |
| break; |
| } |
| |
| demand_empty_rest_of_line (); |
| if (cfi_sections_set |
| && (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)) |
| && ((cfi_sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)) |
| != (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact)))) |
| as_bad (_("inconsistent uses of .cfi_sections")); |
| cfi_sections = sections; |
| } |
| |
| static void |
| dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) |
| { |
| int simple = 0; |
| |
| if (frchain_now->frch_cfi_data != NULL) |
| { |
| as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| cfi_new_fde (symbol_temp_new_now ()); |
| |
| SKIP_WHITESPACE (); |
| if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"') |
| { |
| char * saved_ilp = input_line_pointer; |
| char *name, c; |
| |
| c = get_symbol_name (& name); |
| |
| if (strcmp (name, "simple") == 0) |
| { |
| simple = 1; |
| restore_line_pointer (c); |
| } |
| else |
| input_line_pointer = saved_ilp; |
| } |
| demand_empty_rest_of_line (); |
| |
| cfi_set_sections (); |
| |
| frchain_now->frch_cfi_data->cur_cfa_offset = 0; |
| if (!simple) |
| tc_cfi_frame_initial_instructions (); |
| |
| if ((all_cfi_sections & CFI_EMIT_target) != 0) |
| tc_cfi_startproc (); |
| } |
| |
| static void |
| dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) |
| { |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| cfi_set_last_fde (frchain_now->frch_cfi_data->cur_fde_data); |
| |
| cfi_end_fde (symbol_temp_new_now ()); |
| |
| demand_empty_rest_of_line (); |
| |
| if ((all_cfi_sections & CFI_EMIT_target) != 0) |
| tc_cfi_endproc (last_fde); |
| } |
| |
| static segT |
| get_cfi_seg (segT cseg, const char *base, flagword flags, int align) |
| { |
| /* Exclude .debug_frame sections for Compact EH. */ |
| if (SUPPORT_FRAME_LINKONCE || ((flags & SEC_DEBUGGING) == 0 && compact_eh) |
| || ((flags & SEC_DEBUGGING) == 0 && TARGET_MULTIPLE_EH_FRAME_SECTIONS)) |
| { |
| segT iseg = cseg; |
| struct dwcfi_seg_list *l; |
| |
| l = dwcfi_hash_find_or_make (cseg, base, flags); |
| |
| cseg = l->seg; |
| subseg_set (cseg, l->subseg); |
| |
| if (TARGET_MULTIPLE_EH_FRAME_SECTIONS |
| && (flags & DWARF2_EH_FRAME_READ_ONLY)) |
| { |
| const frchainS *ifrch = seg_info (iseg)->frchainP; |
| const frchainS *frch = seg_info (cseg)->frchainP; |
| expressionS exp; |
| |
| exp.X_op = O_symbol; |
| exp.X_add_symbol = (symbolS *) local_symbol_make (cseg->name, cseg, frch->frch_root, 0); |
| exp.X_add_number = 0; |
| subseg_set (iseg, ifrch->frch_subseg); |
| fix_new_exp (ifrch->frch_root, 0, 0, &exp, 0, BFD_RELOC_NONE); |
| |
| /* Restore the original segment info. */ |
| subseg_set (cseg, l->subseg); |
| } |
| } |
| else |
| { |
| cseg = subseg_new (base, 0); |
| bfd_set_section_flags (cseg, flags); |
| } |
| record_alignment (cseg, align); |
| return cseg; |
| } |
| |
| #if SUPPORT_COMPACT_EH |
| static void |
| dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED) |
| { |
| struct fde_entry *fde; |
| |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_("CFI instruction used without previous .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| fde = frchain_now->frch_cfi_data->cur_fde_data; |
| fde->personality_id = cfi_parse_const (); |
| demand_empty_rest_of_line (); |
| |
| if (fde->personality_id == 0 || fde->personality_id > 3) |
| { |
| as_bad (_("wrong argument to .cfi_personality_id")); |
| return; |
| } |
| } |
| |
| static void |
| dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED) |
| { |
| if (frchain_now->frch_cfi_data == NULL) |
| { |
| as_bad (_(".cfi_fde_data without corresponding .cfi_startproc")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| cfi_set_last_fde (frchain_now->frch_cfi_data->cur_fde_data); |
| |
| if ((all_cfi_sections & CFI_EMIT_target) != 0 |
| || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0) |
| { |
| struct cfi_escape_data *head, **tail, *e; |
| int num_ops = 0; |
| |
| tail = &head; |
| if (!is_it_end_of_statement ()) |
| { |
| num_ops = 0; |
| do |
| { |
| e = XNEW (struct cfi_escape_data); |
| do_parse_cons_expression (&e->exp, 1); |
| *tail = e; |
| tail = &e->next; |
| num_ops++; |
| } |
| while (*input_line_pointer++ == ','); |
| --input_line_pointer; |
| } |
| *tail = NULL; |
| |
| if (last_fde->lsda_encoding != DW_EH_PE_omit) |
| last_fde->eh_header_type = EH_COMPACT_HAS_LSDA; |
| else if (num_ops <= 3 && last_fde->per_encoding == DW_EH_PE_omit) |
| last_fde->eh_header_type = EH_COMPACT_INLINE; |
| else |
| last_fde->eh_header_type = EH_COMPACT_OUTLINE; |
| |
| if (last_fde->eh_header_type == EH_COMPACT_INLINE) |
| num_ops = 3; |
| |
| last_fde->eh_data_size = num_ops; |
| last_fde->eh_data = XNEWVEC (bfd_byte, num_ops); |
| num_ops = 0; |
| while (head) |
| { |
| e = head; |
| head = e->next; |
| last_fde->eh_data[num_ops++] = e->exp.X_add_number; |
| free (e); |
| } |
| if (last_fde->eh_header_type == EH_COMPACT_INLINE) |
| while (num_ops < 3) |
| last_fde->eh_data[num_ops++] = tc_compact_eh_opcode_stop; |
| } |
| |
| demand_empty_rest_of_line (); |
| } |
| |
| /* Function to emit the compact unwinding opcodes stored in the |
| fde's eh_data field. The end of the opcode data will be |
| padded to the value in align. */ |
| |
| static void |
| output_compact_unwind_data (struct fde_entry *fde, int align) |
| { |
| int data_size = fde->eh_data_size + 2; |
| int align_padding; |
| int amask; |
| char *p; |
| |
| fde->eh_loc = symbol_temp_new_now (); |
| |
| p = frag_more (1); |
| if (fde->personality_id != 0) |
| *p = fde->personality_id; |
| else if (fde->per_encoding != DW_EH_PE_omit) |
| { |
| *p = 0; |
| emit_expr_encoded (&fde->personality, fde->per_encoding, false); |
| data_size += encoding_size (fde->per_encoding); |
| } |
| else |
| *p = 1; |
| |
| amask = (1 << align) - 1; |
| align_padding = ((data_size + amask) & ~amask) - data_size; |
| |
| p = frag_more (fde->eh_data_size + 1 + align_padding); |
| memcpy (p, fde->eh_data, fde->eh_data_size); |
| p += fde->eh_data_size; |
| |
| while (align_padding-- > 0) |
| *(p++) = tc_compact_eh_opcode_pad; |
| |
| *(p++) = tc_compact_eh_opcode_stop; |
| fde->eh_header_type = EH_COMPACT_OUTLINE_DONE; |
| } |
| |
| /* Handle the .cfi_inline_lsda directive. */ |
| static void |
| dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED) |
| { |
| segT ccseg; |
| int align; |
| long max_alignment = 28; |
| |
| if (!last_fde) |
| { |
| as_bad (_("unexpected .cfi_inline_lsda")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| if ((last_fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
| { |
| as_bad (_(".cfi_inline_lsda not valid for this frame")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| if (last_fde->eh_header_type != EH_COMPACT_UNKNOWN |
| && last_fde->eh_header_type != EH_COMPACT_HAS_LSDA) |
| { |
| as_bad (_(".cfi_inline_lsda seen for frame without .cfi_lsda")); |
| ignore_rest_of_line (); |
| return; |
| } |
| |
| #ifdef md_flush_pending_output |
| md_flush_pending_output (); |
| #endif |
| |
| align = get_absolute_expression (); |
| if (align > max_alignment) |
| { |
| align = max_alignment; |
| as_bad (_("Alignment too large: %d. assumed."), align); |
| } |
| else if (align < 0) |
| { |
| as_warn (_("Alignment negative: 0 assumed.")); |
| align = 0; |
| } |
| |
| demand_empty_rest_of_line (); |
| ccseg = CUR_SEG (last_fde); |
| |
| /* Open .gnu_extab section. */ |
| get_cfi_seg (ccseg, ".gnu_extab", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| 1); |
| |
| frag_align (align, 0, 0); |
| record_alignment (now_seg, align); |
| if (last_fde->eh_header_type == EH_COMPACT_HAS_LSDA) |
| output_compact_unwind_data (last_fde, align); |
| |
| cfi_set_last_fde (NULL); |
| |
| return; |
| } |
| #else /* !SUPPORT_COMPACT_EH */ |
| static void |
| dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED) |
| { |
| as_bad (_(".cfi_inline_lsda is not supported for this target")); |
| ignore_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED) |
| { |
| as_bad (_(".cfi_fde_data is not supported for this target")); |
| ignore_rest_of_line (); |
| } |
| |
| static void |
| dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED) |
| { |
| as_bad (_(".cfi_personality_id is not supported for this target")); |
| ignore_rest_of_line (); |
| } |
| #endif |
| |
| static void |
| output_cfi_insn (struct cfi_insn_data *insn) |
| { |
| offsetT offset; |
| unsigned int regno; |
| |
| switch (insn->insn) |
| { |
| case DW_CFA_advance_loc: |
| { |
| symbolS *from = insn->u.ll.lab1; |
| symbolS *to = insn->u.ll.lab2; |
| |
| if (symbol_get_frag (to) == symbol_get_frag (from)) |
| { |
| addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); |
| addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; |
| |
| if (scaled == 0) |
| ; |
| else if (scaled <= 0x3F) |
| out_one (DW_CFA_advance_loc + scaled); |
| else if (scaled <= 0xFF) |
| { |
| out_one (DW_CFA_advance_loc1); |
| out_one (scaled); |
| } |
| else if (scaled <= 0xFFFF) |
| { |
| out_one (DW_CFA_advance_loc2); |
| out_two (scaled); |
| } |
| else |
| { |
| out_one (DW_CFA_advance_loc4); |
| out_four (scaled); |
| } |
| } |
| else |
| { |
| expressionS exp; |
| |
| exp.X_op = O_subtract; |
| exp.X_add_symbol = to; |
| exp.X_op_symbol = from; |
| exp.X_add_number = 0; |
| |
| /* The code in ehopt.c expects that one byte of the encoding |
| is already allocated to the frag. This comes from the way |
| that it scans the .eh_frame section looking first for the |
| .byte DW_CFA_advance_loc4. Call frag_grow with the sum of |
| room needed by frag_more and frag_var to preallocate space |
| ensuring that the DW_CFA_advance_loc4 is in the fixed part |
| of the rs_cfa frag, so that the relax machinery can remove |
| the advance_loc should it advance by zero. */ |
| frag_grow (5); |
| *frag_more (1) = DW_CFA_advance_loc4; |
| |
| frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, |
| make_expr_symbol (&exp), frag_now_fix () - 1, |
| (char *) frag_now); |
| } |
| } |
| break; |
| |
| case DW_CFA_def_cfa: |
| offset = insn->u.ri.offset; |
| if (offset < 0) |
| { |
| out_one (DW_CFA_def_cfa_sf); |
| out_uleb128 (insn->u.ri.reg); |
| out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| } |
| else |
| { |
| out_one (DW_CFA_def_cfa); |
| out_uleb128 (insn->u.ri.reg); |
| out_uleb128 (offset); |
| } |
| break; |
| |
| case DW_CFA_def_cfa_register: |
| case DW_CFA_undefined: |
| case DW_CFA_same_value: |
| out_one (insn->insn); |
| out_uleb128 (insn->u.r); |
| break; |
| |
| case DW_CFA_def_cfa_offset: |
| offset = insn->u.i; |
| if (offset < 0) |
| { |
| out_one (DW_CFA_def_cfa_offset_sf); |
| out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); |
| } |
| else |
| { |
| out_one (DW_CFA_def_cfa_offset); |
| out_uleb128 (offset); |
| } |
| break; |
| |
| case DW_CFA_restore: |
| regno = insn->u.r; |
| if (regno <= 0x3F) |
| { |
| out_one (DW_CFA_restore + regno); |
| } |
| else |
| { |
| out_one (DW_CFA_restore_extended); |
| out_uleb128 (regno); |
| } |
| break; |
| |
| case DW_CFA_offset: |
| regno = insn->u.ri.reg; |
| offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
| if (offset < 0) |
| { |
| out_one (DW_CFA_offset_extended_sf); |
| out_uleb128 (regno); |
| out_sleb128 (offset); |
| } |
| else if (regno <= 0x3F) |
| { |
| out_one (DW_CFA_offset + regno); |
| out_uleb128 (offset); |
| } |
| else |
| { |
| out_one (DW_CFA_offset_extended); |
| out_uleb128 (regno); |
| out_uleb128 (offset); |
| } |
| break; |
| |
| case DW_CFA_val_offset: |
| regno = insn->u.ri.reg; |
| offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; |
| if (offset < 0) |
| { |
| out_one (DW_CFA_val_offset_sf); |
| out_uleb128 (regno); |
| out_sleb128 (offset); |
| } |
| else |
| { |
| out_one (DW_CFA_val_offset); |
| out_uleb128 (regno); |
| out_uleb128 (offset); |
| } |
| break; |
| |
| case DW_CFA_register: |
| out_one (DW_CFA_register); |
| out_uleb128 (insn->u.rr.reg1); |
| out_uleb128 (insn->u.rr.reg2); |
| break; |
| |
| case DW_CFA_remember_state: |
| case DW_CFA_restore_state: |
| out_one (insn->insn); |
| break; |
| |
| case DW_CFA_GNU_window_save: |
| out_one (DW_CFA_GNU_window_save); |
| break; |
| |
| case CFI_escape: |
| { |
| struct cfi_escape_data *e; |
| for (e = insn->u.esc; e ; e = e->next) |
| emit_expr (&e->exp, 1); |
| break; |
| } |
| |
| case CFI_val_encoded_addr: |
| { |
| unsigned encoding = insn->u.ea.encoding; |
| offsetT enc_size; |
| |
| if (encoding == DW_EH_PE_omit) |
| break; |
| out_one (DW_CFA_val_expression); |
| out_uleb128 (insn->u.ea.reg); |
| |
| switch (encoding & 0x7) |
| { |
| case DW_EH_PE_absptr: |
| enc_size = DWARF2_ADDR_SIZE (stdoutput); |
| break; |
| case DW_EH_PE_udata2: |
| enc_size = 2; |
| break; |
| case DW_EH_PE_udata4: |
| enc_size = 4; |
| break; |
| case DW_EH_PE_udata8: |
| enc_size = 8; |
| break; |
| default: |
| abort (); |
| } |
| |
| /* If the user has requested absolute encoding, |
| then use the smaller DW_OP_addr encoding. */ |
| if (insn->u.ea.encoding == DW_EH_PE_absptr) |
| { |
| out_uleb128 (1 + enc_size); |
| out_one (DW_OP_addr); |
| } |
| else |
| { |
| out_uleb128 (1 + 1 + enc_size); |
| out_one (DW_OP_GNU_encoded_addr); |
| out_one (encoding); |
| |
| if ((encoding & 0x70) == DW_EH_PE_pcrel) |
| { |
| #if CFI_DIFF_EXPR_OK |
| insn->u.ea.exp.X_op = O_subtract; |
| insn->u.ea.exp.X_op_symbol = symbol_temp_new_now (); |
| #elif defined (tc_cfi_emit_pcrel_expr) |
| tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, enc_size); |
| break; |
| #else |
| abort (); |
| #endif |
| } |
| } |
| emit_expr (&insn->u.ea.exp, enc_size); |
| } |
| break; |
| |
| case CFI_label: |
| colon (insn->u.sym_name); |
| break; |
| |
| default: |
| abort (); |
| } |
| } |
| |
| static void |
| output_cie (struct cie_entry *cie, bool eh_frame, int align) |
| { |
| symbolS *after_size_address, *end_address; |
| expressionS exp; |
| struct cfi_insn_data *i; |
| offsetT augmentation_size; |
| int enc; |
| enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
| |
| cie->start_address = symbol_temp_new_now (); |
| after_size_address = symbol_temp_make (); |
| end_address = symbol_temp_make (); |
| |
| exp.X_op = O_subtract; |
| exp.X_add_symbol = end_address; |
| exp.X_op_symbol = after_size_address; |
| exp.X_add_number = 0; |
| |
| if (eh_frame || fmt == dwarf2_format_32bit) |
| emit_expr (&exp, 4); /* Length. */ |
| else |
| { |
| if (fmt == dwarf2_format_64bit) |
| out_four (-1); |
| emit_expr (&exp, 8); /* Length. */ |
| } |
| symbol_set_value_now (after_size_address); |
| if (eh_frame) |
| out_four (0); /* CIE id. */ |
| else |
| { |
| out_four (-1); /* CIE id. */ |
| if (fmt != dwarf2_format_32bit) |
| out_four (-1); |
| } |
| out_one (flag_dwarf_cie_version); /* Version. */ |
| if (eh_frame) |
| { |
| out_one ('z'); /* Augmentation. */ |
| if (cie->per_encoding != DW_EH_PE_omit) |
| out_one ('P'); |
| if (cie->lsda_encoding != DW_EH_PE_omit) |
| out_one ('L'); |
| out_one ('R'); |
| #ifdef tc_output_cie_extra |
| tc_output_cie_extra (cie); |
| #endif |
| } |
| if (cie->signal_frame) |
| out_one ('S'); |
| out_one (0); |
| if (flag_dwarf_cie_version >= 4) |
| { |
| /* For now we are assuming a flat address space with 4 or 8 byte |
| addresses. */ |
| int address_size = dwarf2_format_32bit ? 4 : 8; |
| out_one (address_size); /* Address size. */ |
| out_one (0); /* Segment size. */ |
| } |
| out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */ |
| out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */ |
| if (flag_dwarf_cie_version == 1) /* Return column. */ |
| { |
| if ((cie->return_column & 0xff) != cie->return_column) |
| as_bad (_("return column number %d overflows in CIE version 1"), |
| cie->return_column); |
| out_one (cie->return_column); |
| } |
| else |
| out_uleb128 (cie->return_column); |
| if (eh_frame) |
| { |
| augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit); |
| if (cie->per_encoding != DW_EH_PE_omit) |
| augmentation_size += 1 + encoding_size (cie->per_encoding); |
| out_uleb128 (augmentation_size); /* Augmentation size. */ |
| |
| emit_expr_encoded (&cie->personality, cie->per_encoding, true); |
| |
| if (cie->lsda_encoding != DW_EH_PE_omit) |
| out_one (cie->lsda_encoding); |
| } |
| |
| switch (DWARF2_FDE_RELOC_SIZE) |
| { |
| case 2: |
| enc = DW_EH_PE_sdata2; |
| break; |
| case 4: |
| enc = DW_EH_PE_sdata4; |
| break; |
| case 8: |
| enc = DW_EH_PE_sdata8; |
| break; |
| default: |
| abort (); |
| } |
| #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr |
| enc |= DW_EH_PE_pcrel; |
| #endif |
| #ifdef DWARF2_FDE_RELOC_ENCODING |
| /* Allow target to override encoding. */ |
| enc = DWARF2_FDE_RELOC_ENCODING (enc); |
| #endif |
| cie->fde_encoding = enc; |
| if (eh_frame) |
| out_one (enc); |
| |
| if (cie->first) |
| { |
| for (i = cie->first; i != cie->last; i = i->next) |
| { |
| if (CUR_SEG (i) != CUR_SEG (cie)) |
| continue; |
| output_cfi_insn (i); |
| } |
| } |
| |
| frag_align (align, DW_CFA_nop, 0); |
| symbol_set_value_now (end_address); |
| } |
| |
| static void |
| output_fde (struct fde_entry *fde, struct cie_entry *cie, |
| bool eh_frame, struct cfi_insn_data *first, |
| int align) |
| { |
| symbolS *after_size_address, *end_address; |
| expressionS exp; |
| offsetT augmentation_size; |
| enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); |
| unsigned int offset_size; |
| unsigned int addr_size; |
| |
| after_size_address = symbol_temp_make (); |
| end_address = symbol_temp_make (); |
| |
| exp.X_op = O_subtract; |
| exp.X_add_symbol = end_address; |
| exp.X_op_symbol = after_size_address; |
| exp.X_add_number = 0; |
| if (eh_frame || fmt == dwarf2_format_32bit) |
| offset_size = 4; |
| else |
| { |
| if (fmt == dwarf2_format_64bit) |
| out_four (-1); |
| offset_size = 8; |
| } |
| emit_expr (&exp, offset_size); /* Length. */ |
| symbol_set_value_now (after_size_address); |
| |
| if (eh_frame) |
| { |
| exp.X_op = O_subtract; |
| exp.X_add_symbol = after_size_address; |
| exp.X_op_symbol = cie->start_address; |
| exp.X_add_number = 0; |
| emit_expr (&exp, offset_size); /* CIE offset. */ |
| } |
| else |
| { |
| TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size); |
| } |
| |
| exp.X_op = O_symbol; |
| if (eh_frame) |
| { |
| bfd_reloc_code_real_type code |
| = tc_cfi_reloc_for_encoding (cie->fde_encoding); |
| addr_size = DWARF2_FDE_RELOC_SIZE; |
| if (code != BFD_RELOC_NONE) |
| { |
| reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code); |
| char *p = frag_more (addr_size); |
| gas_assert (addr_size == (unsigned) howto->bitsize / 8); |
| md_number_to_chars (p, 0, addr_size); |
| fix_new (frag_now, p - frag_now->fr_literal, addr_size, |
| fde->start_address, 0, howto->pc_relative, code); |
| } |
| else |
| { |
| exp.X_op = O_subtract; |
| exp.X_add_number = 0; |
| #if CFI_DIFF_EXPR_OK |
| exp.X_add_symbol = fde->start_address; |
| exp.X_op_symbol = symbol_temp_new_now (); |
| emit_expr (&exp, addr_size); /* Code offset. */ |
| #else |
| exp.X_op = O_symbol; |
| exp.X_add_symbol = fde->start_address; |
| |
| #if defined(tc_cfi_emit_pcrel_expr) |
| tc_cfi_emit_pcrel_expr (&exp, addr_size); /* Code offset. */ |
| #else |
| emit_expr (&exp, addr_size); /* Code offset. */ |
| #endif |
| #endif |
| } |
| } |
| else |
| { |
| exp.X_add_number = 0; |
| exp.X_add_symbol = fde->start_address; |
| addr_size = DWARF2_ADDR_SIZE (stdoutput); |
| emit_expr (&exp, addr_size); |
| } |
| |
| exp.X_op = O_subtract; |
| exp.X_add_symbol = fde->end_address; |
| exp.X_op_symbol = fde->start_address; /* Code length. */ |
| exp.X_add_number = 0; |
| emit_expr (&exp, addr_size); |
| |
| augmentation_size = encoding_size (fde->lsda_encoding); |
| if (eh_frame) |
| out_uleb128 (augmentation_size); /* Augmentation size. */ |
| |
| emit_expr_encoded (&fde->lsda, cie->lsda_encoding, false); |
| |
| for (; first; first = first->next) |
| if (CUR_SEG (first) == CUR_SEG (fde)) |
| output_cfi_insn (first); |
| |
| frag_align (align, DW_CFA_nop, 0); |
| symbol_set_value_now (end_address); |
| } |
| |
| /* Allow these insns to be put in the initial sequence of a CIE. |
| If J is non-NULL, then compare I and J insns for a match. */ |
| |
| static inline bool |
| initial_cie_insn (const struct cfi_insn_data *i, const struct cfi_insn_data *j) |
| { |
| if (j && i->insn != j->insn) |
| return false; |
| switch (i->insn) |
| { |
| case DW_CFA_offset: |
| case DW_CFA_def_cfa: |
| case DW_CFA_val_offset: |
| if (j) |
| { |
| if (i->u.ri.reg != j->u.ri.reg) |
| return false; |
| if (i->u.ri.offset != j->u.ri.offset) |
| return false; |
| } |
| break; |
| |
| case DW_CFA_register: |
| if (j) |
| { |
| if (i->u.rr.reg1 != j->u.rr.reg1) |
| return false; |
| if (i->u.rr.reg2 != j->u.rr.reg2) |
| return false; |
| } |
| break; |
| |
| case DW_CFA_def_cfa_register: |
| case DW_CFA_restore: |
| case DW_CFA_undefined: |
| case DW_CFA_same_value: |
| if (j) |
| { |
| if (i->u.r != j->u.r) |
| return false; |
| } |
| break; |
| |
| case DW_CFA_def_cfa_offset: |
| if (j) |
| { |
| if (i->u.i != j->u.i) |
| return false; |
| } |
| break; |
| |
| default: |
| return false; |
| } |
| return true; |
| } |
| |
| static struct cie_entry * |
| select_cie_for_fde (struct fde_entry *fde, bool eh_frame, |
| struct cfi_insn_data **pfirst, int align) |
| { |
| struct cfi_insn_data *i, *j; |
| struct cie_entry *cie; |
| |
| for (cie = cie_root; cie; cie = cie->next) |
| { |
| if (CUR_SEG (cie) != CUR_SEG (fde)) |
| continue; |
| #ifdef tc_cie_fde_equivalent_extra |
| if (!tc_cie_fde_equivalent_extra (cie, fde)) |
| continue; |
| #endif |
| if (cie->return_column != fde->return_column |
| || cie->signal_frame != fde->signal_frame |
| || cie->per_encoding != fde->per_encoding |
| || cie->lsda_encoding != fde->lsda_encoding) |
| continue; |
| if (cie->per_encoding != DW_EH_PE_omit) |
| { |
| if (cie->personality.X_op != fde->personality.X_op |
| || (cie->personality.X_add_number |
| != fde->personality.X_add_number)) |
| continue; |
| switch (cie->personality.X_op) |
| { |
| case O_constant: |
| if (cie->personality.X_unsigned != fde->personality.X_unsigned) |
| continue; |
| break; |
| case O_symbol: |
| if (cie->personality.X_add_symbol |
| != fde->personality.X_add_symbol) |
| continue; |
| break; |
| default: |
| abort (); |
| } |
| } |
| for (i = cie->first, j = fde->data; |
| i != cie->last && j != NULL; |
| i = i->next, j = j->next) |
| { |
| if (!initial_cie_insn (i, j)) |
| break; |
| } |
| |
| if (i == cie->last) |
| { |
| *pfirst = j; |
| return cie; |
| } |
| } |
| |
| cie = XNEW (struct cie_entry); |
| cie->next = cie_root; |
| cie_root = cie; |
| SET_CUR_SEG (cie, CUR_SEG (fde)); |
| cie->return_column = fde->return_column; |
| cie->signal_frame = fde->signal_frame; |
| cie->per_encoding = fde->per_encoding; |
| cie->lsda_encoding = fde->lsda_encoding; |
| cie->personality = fde->personality; |
| cie->first = fde->data; |
| #ifdef tc_cie_entry_init_extra |
| tc_cie_entry_init_extra (cie, fde) |
| #endif |
| |
| for (i = cie->first; i ; i = i->next) |
| if (!initial_cie_insn (i, NULL)) |
| break; |
| |
| cie->last = i; |
| *pfirst = i; |
| |
| output_cie (cie, eh_frame, align); |
| |
| return cie; |
| } |
| |
| #ifdef md_reg_eh_frame_to_debug_frame |
| static void |
| cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg) |
| { |
| for (; insn; insn = insn->next) |
| { |
| if (CUR_SEG (insn) != ccseg) |
| continue; |
| switch (insn->insn) |
| { |
| case DW_CFA_advance_loc: |
| case DW_CFA_def_cfa_offset: |
| case DW_CFA_remember_state: |
| case DW_CFA_restore_state: |
| case DW_CFA_GNU_window_save: |
| case CFI_escape: |
| case CFI_label: |
| break; |
| |
| case DW_CFA_def_cfa: |
| case DW_CFA_offset: |
| insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg); |
| break; |
| |
| case DW_CFA_def_cfa_register: |
| case DW_CFA_undefined: |
| case DW_CFA_same_value: |
| case DW_CFA_restore: |
| insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r); |
| break; |
| |
| case DW_CFA_register: |
| insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1); |
| insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2); |
| break; |
| |
| case CFI_val_encoded_addr: |
| insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg); |
| break; |
| |
| default: |
| abort (); |
| } |
| } |
| } |
| #else |
| #define cfi_change_reg_numbers(insn, cseg) do { } while (0) |
| #endif |
| |
| #if SUPPORT_COMPACT_EH |
| static void |
| cfi_emit_eh_header (symbolS *sym, bfd_vma addend) |
| { |
| expressionS exp; |
| |
| exp.X_add_number = addend; |
| exp.X_add_symbol = sym; |
| emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, false); |
| } |
| |
| static void |
| output_eh_header (struct fde_entry *fde) |
| { |
| char *p; |
| bfd_vma addend; |
| |
| if (fde->eh_header_type == EH_COMPACT_INLINE) |
| addend = 0; |
| else |
| addend = 1; |
| |
| cfi_emit_eh_header (fde->start_address, addend); |
| |
| if (fde->eh_header_type == EH_COMPACT_INLINE) |
| { |
| p = frag_more (4); |
| /* Inline entries always use PR1. */ |
| *(p++) = 1; |
| memcpy(p, fde->eh_data, 3); |
| } |
| else |
| { |
| if (fde->eh_header_type == EH_COMPACT_LEGACY) |
| addend = 1; |
| else if (fde->eh_header_type == EH_COMPACT_OUTLINE |
| || fde->eh_header_type == EH_COMPACT_OUTLINE_DONE) |
| addend = 0; |
| else |
| abort (); |
| cfi_emit_eh_header (fde->eh_loc, addend); |
| } |
| } |
| #endif |
| |
| void |
| cfi_finish (void) |
| { |
| struct cie_entry *cie, *cie_next; |
| segT cfi_seg, ccseg; |
| struct fde_entry *fde; |
| struct cfi_insn_data *first; |
| int save_flag_traditional_format, seek_next_seg; |
| |
| if (all_fde_data == 0) |
| return; |
| |
| if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0 |
| || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0) |
| { |
| /* Make sure check_eh_frame doesn't do anything with our output. */ |
| save_flag_traditional_format = flag_traditional_format; |
| flag_traditional_format = 1; |
| |
| if (!EH_FRAME_LINKONCE) |
| { |
| /* Open .eh_frame section. */ |
| cfi_seg = get_cfi_seg (NULL, ".eh_frame", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| EH_FRAME_ALIGNMENT); |
| #ifdef md_fix_up_eh_frame |
| md_fix_up_eh_frame (cfi_seg); |
| #else |
| (void) cfi_seg; |
| #endif |
| } |
| |
| do |
| { |
| ccseg = NULL; |
| seek_next_seg = 0; |
| |
| for (cie = cie_root; cie; cie = cie_next) |
| { |
| cie_next = cie->next; |
| free ((void *) cie); |
| } |
| cie_root = NULL; |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| { |
| if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
| && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
| continue; |
| |
| #if SUPPORT_COMPACT_EH |
| /* Emit a LEGACY format header if we have processed all |
| of the .cfi directives without encountering either inline or |
| out-of-line compact unwinding opcodes. */ |
| if (fde->eh_header_type == EH_COMPACT_HAS_LSDA |
| || fde->eh_header_type == EH_COMPACT_UNKNOWN) |
| fde->eh_header_type = EH_COMPACT_LEGACY; |
| |
| if (fde->eh_header_type != EH_COMPACT_LEGACY) |
| continue; |
| #endif |
| if (EH_FRAME_LINKONCE) |
| { |
| if (HANDLED (fde)) |
| continue; |
| if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| { |
| seek_next_seg = 2; |
| continue; |
| } |
| if (!seek_next_seg) |
| { |
| ccseg = CUR_SEG (fde); |
| /* Open .eh_frame section. */ |
| cfi_seg = get_cfi_seg (ccseg, ".eh_frame", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| EH_FRAME_ALIGNMENT); |
| #ifdef md_fix_up_eh_frame |
| md_fix_up_eh_frame (cfi_seg); |
| #else |
| (void) cfi_seg; |
| #endif |
| seek_next_seg = 1; |
| } |
| SET_HANDLED (fde, 1); |
| } |
| |
| if (fde->end_address == NULL) |
| { |
| as_bad (_("open CFI at the end of file; " |
| "missing .cfi_endproc directive")); |
| fde->end_address = fde->start_address; |
| } |
| |
| cie = select_cie_for_fde (fde, true, &first, 2); |
| fde->eh_loc = symbol_temp_new_now (); |
| output_fde (fde, cie, true, first, |
| fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); |
| } |
| } |
| while (EH_FRAME_LINKONCE && seek_next_seg == 2); |
| |
| if (EH_FRAME_LINKONCE) |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| SET_HANDLED (fde, 0); |
| |
| #if SUPPORT_COMPACT_EH |
| if (compact_eh) |
| { |
| /* Create remaining out of line table entries. */ |
| do |
| { |
| ccseg = NULL; |
| seek_next_seg = 0; |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| { |
| if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
| && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
| continue; |
| |
| if (fde->eh_header_type != EH_COMPACT_OUTLINE) |
| continue; |
| if (HANDLED (fde)) |
| continue; |
| if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| { |
| seek_next_seg = 2; |
| continue; |
| } |
| if (!seek_next_seg) |
| { |
| ccseg = CUR_SEG (fde); |
| /* Open .gnu_extab section. */ |
| get_cfi_seg (ccseg, ".gnu_extab", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| 1); |
| seek_next_seg = 1; |
| } |
| SET_HANDLED (fde, 1); |
| |
| frag_align (1, 0, 0); |
| record_alignment (now_seg, 1); |
| output_compact_unwind_data (fde, 1); |
| } |
| } |
| while (EH_FRAME_LINKONCE && seek_next_seg == 2); |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| SET_HANDLED (fde, 0); |
| |
| /* Create index table fragments. */ |
| do |
| { |
| ccseg = NULL; |
| seek_next_seg = 0; |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| { |
| if ((fde->sections & CFI_EMIT_eh_frame) == 0 |
| && (fde->sections & CFI_EMIT_eh_frame_compact) == 0) |
| continue; |
| |
| if (HANDLED (fde)) |
| continue; |
| if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| { |
| seek_next_seg = 2; |
| continue; |
| } |
| if (!seek_next_seg) |
| { |
| ccseg = CUR_SEG (fde); |
| /* Open .eh_frame_entry section. */ |
| cfi_seg = get_cfi_seg (ccseg, ".eh_frame_entry", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| 2); |
| seek_next_seg = 1; |
| } |
| SET_HANDLED (fde, 1); |
| |
| output_eh_header (fde); |
| } |
| } |
| while (seek_next_seg == 2); |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| SET_HANDLED (fde, 0); |
| } |
| #endif /* SUPPORT_COMPACT_EH */ |
| |
| flag_traditional_format = save_flag_traditional_format; |
| } |
| |
| /* Generate SFrame section if the user specifies: |
| - the command line option to gas, or |
| - .sframe in the .cfi_sections directive. */ |
| if (flag_gen_sframe || (all_cfi_sections & CFI_EMIT_sframe) != 0) |
| { |
| if (support_sframe_p ()) |
| { |
| segT sframe_seg; |
| int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; |
| |
| if (!SUPPORT_FRAME_LINKONCE) |
| sframe_seg = get_cfi_seg (NULL, ".sframe", |
| (SEC_ALLOC | SEC_LOAD | SEC_DATA |
| | DWARF2_EH_FRAME_READ_ONLY), |
| alignment); |
| output_sframe (sframe_seg); |
| } |
| else |
| as_bad (_(".sframe not supported for target")); |
| } |
| |
| if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0) |
| { |
| int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; |
| |
| if (!SUPPORT_FRAME_LINKONCE) |
| get_cfi_seg (NULL, ".debug_frame", |
| SEC_READONLY | SEC_DEBUGGING, |
| alignment); |
| |
| do |
| { |
| ccseg = NULL; |
| seek_next_seg = 0; |
| |
| for (cie = cie_root; cie; cie = cie_next) |
| { |
| cie_next = cie->next; |
| free ((void *) cie); |
| } |
| cie_root = NULL; |
| |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| { |
| if ((fde->sections & CFI_EMIT_debug_frame) == 0) |
| continue; |
| |
| if (SUPPORT_FRAME_LINKONCE) |
| { |
| if (HANDLED (fde)) |
| continue; |
| if (seek_next_seg && CUR_SEG (fde) != ccseg) |
| { |
| seek_next_seg = 2; |
| continue; |
| } |
| if (!seek_next_seg) |
| { |
| ccseg = CUR_SEG (fde); |
| /* Open .debug_frame section. */ |
| get_cfi_seg (ccseg, ".debug_frame", |
| SEC_READONLY | SEC_DEBUGGING, |
| alignment); |
| seek_next_seg = 1; |
| } |
| SET_HANDLED (fde, 1); |
| } |
| if (fde->end_address == NULL) |
| { |
| as_bad (_("open CFI at the end of file; " |
| "missing .cfi_endproc directive")); |
| fde->end_address = fde->start_address; |
| } |
| |
| fde->per_encoding = DW_EH_PE_omit; |
| fde->lsda_encoding = DW_EH_PE_omit; |
| cfi_change_reg_numbers (fde->data, ccseg); |
| cie = select_cie_for_fde (fde, false, &first, alignment); |
| output_fde (fde, cie, false, first, alignment); |
| } |
| } |
| while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); |
| |
| if (SUPPORT_FRAME_LINKONCE) |
| for (fde = all_fde_data; fde ; fde = fde->next) |
| SET_HANDLED (fde, 0); |
| } |
| if (dwcfi_hash) |
| htab_delete (dwcfi_hash); |
| } |
| |
| #else /* TARGET_USE_CFIPOP */ |
| |
| /* Emit an intelligible error message for missing support. */ |
| |
| static void |
| dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED) |
| { |
| as_bad (_("CFI is not supported for this target")); |
| ignore_rest_of_line (); |
| } |
| |
| const pseudo_typeS cfi_pseudo_table[] = |
| { |
| { "cfi_sections", dot_cfi_dummy, 0 }, |
| { "cfi_startproc", dot_cfi_dummy, 0 }, |
| { "cfi_endproc", dot_cfi_dummy, 0 }, |
| { "cfi_fde_data", dot_cfi_dummy, 0 }, |
| { "cfi_def_cfa", dot_cfi_dummy, 0 }, |
| { "cfi_def_cfa_register", dot_cfi_dummy, 0 }, |
| { "cfi_def_cfa_offset", dot_cfi_dummy, 0 }, |
| { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 }, |
| { "cfi_offset", dot_cfi_dummy, 0 }, |
| { "cfi_rel_offset", dot_cfi_dummy, 0 }, |
| { "cfi_register", dot_cfi_dummy, 0 }, |
| { "cfi_return_column", dot_cfi_dummy, 0 }, |
| { "cfi_restore", dot_cfi_dummy, 0 }, |
| { "cfi_undefined", dot_cfi_dummy, 0 }, |
| { "cfi_same_value", dot_cfi_dummy, 0 }, |
| { "cfi_remember_state", dot_cfi_dummy, 0 }, |
| { "cfi_restore_state", dot_cfi_dummy, 0 }, |
| { "cfi_window_save", dot_cfi_dummy, 0 }, |
| { "cfi_escape", dot_cfi_dummy, 0 }, |
| { "cfi_signal_frame", dot_cfi_dummy, 0 }, |
| { "cfi_personality", dot_cfi_dummy, 0 }, |
| { "cfi_personality_id", dot_cfi_dummy, 0 }, |
| { "cfi_lsda", dot_cfi_dummy, 0 }, |
| { "cfi_val_encoded_addr", dot_cfi_dummy, 0 }, |
| { "cfi_label", dot_cfi_dummy, 0 }, |
| { "cfi_inline_lsda", dot_cfi_dummy, 0 }, |
| { "cfi_val_offset", dot_cfi_dummy, 0 }, |
| { NULL, NULL, 0 } |
| }; |
| |
| void |
| cfi_finish (void) |
| { |
| } |
| #endif /* TARGET_USE_CFIPOP */ |