X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gas%2Fdw2gencfi.c;h=6be8cb50495d249d200a47ae60792fa99c8d6e90;hb=5a210b9fe8a5fe616320f5adf432516334c3702f;hp=36a5722eeecd832febd15b252542be99b9fe997d;hpb=7c0295b15732ca29ce9325fe89a2aa5c2eb550bf;p=binutils-gdb.git diff --git a/gas/dw2gencfi.c b/gas/dw2gencfi.c index 36a5722eeec..6be8cb50495 100644 --- a/gas/dw2gencfi.c +++ b/gas/dw2gencfi.c @@ -1,12 +1,12 @@ /* dw2gencfi.c - Support for generating Dwarf2 CFI information. - Copyright 2003 Free Software Foundation, Inc. + Copyright (C) 2003-2022 Free Software Foundation, Inc. Contributed by Michal Ludvig 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, @@ -16,709 +16,2577 @@ You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to the Free - Software Foundation, 59 Temple Place - Suite 330, Boston, MA - 02111-1307, USA. */ + Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ -#include #include "as.h" #include "dw2gencfi.h" +#include "subsegs.h" +#include "dwarf2dbg.h" + +#ifdef TARGET_USE_CFIPOP + +/* By default, use difference expressions if DIFF_EXPR_OK is defined. */ +#ifndef CFI_DIFF_EXPR_OK +# ifdef DIFF_EXPR_OK +# define CFI_DIFF_EXPR_OK 1 +# else +# define CFI_DIFF_EXPR_OK 0 +# endif +#endif -/* Current target config. */ -static struct cfi_config current_config; +#ifndef CFI_DIFF_LSDA_OK +#define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK +#endif -/* This is the main entry point to the CFI machinery. */ -static void dot_cfi (int arg); +#if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0 +# error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK" +#endif -const pseudo_typeS cfi_pseudo_table[] = - { - { "cfi_verbose", dot_cfi, CFI_verbose }, - { "cfi_startproc", dot_cfi, CFI_startproc }, - { "cfi_endproc", dot_cfi, CFI_endproc }, - { "cfi_def_cfa", dot_cfi, CFA_def_cfa }, - { "cfi_def_cfa_register", dot_cfi, CFA_def_cfa_register }, - { "cfi_def_cfa_offset", dot_cfi, CFA_def_cfa_offset }, - { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, - { "cfi_offset", dot_cfi, CFA_offset }, - { NULL, NULL, 0 } - }; +/* 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 + +#ifndef tc_cfi_frame_initial_instructions +#define tc_cfi_frame_initial_instructions() ((void)0) +#endif + +#ifndef tc_cfi_startproc +# define tc_cfi_startproc() ((void)0) +#endif + +#ifndef tc_cfi_endproc +# define tc_cfi_endproc(fde) ((void) (fde)) +#endif + +#define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh) + +#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 + +/* 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 const char * -cfi_insn_str (enum cfi_insn insn) -{ - switch (insn) - { - case CFA_nop: - return "CFA_nop"; - case CFA_set_loc: - return "CFA_set_loc"; - case CFA_advance_loc1: - return "CFA_advance_loc1"; - case CFA_advance_loc2: - return "CFA_advance_loc2"; - case CFA_advance_loc4: - return "CFA_advance_loc4"; - case CFA_offset_extended: - return "CFA_offset_extended"; - case CFA_resotre_extended: - return "CFA_resotre_extended"; - case CFA_undefined: - return "CFA_undefined"; - case CFA_same_value: - return "CFA_same_value"; - case CFA_register: - return "CFA_register"; - case CFA_remember_state: - return "CFA_remember_state"; - case CFA_restore_state: - return "CFA_restore_state"; - case CFA_def_cfa: - return "CFA_def_cfa"; - case CFA_def_cfa_register: - return "CFA_def_cfa_register"; - case CFA_def_cfa_offset: - return "CFA_def_cfa_offset"; - case CFA_advance_loc: - return "CFA_advance_loc"; - case CFA_offset: - return "CFA_offset"; - case CFA_restore: - return "CFA_restore"; +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: - break; + 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 ((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; - return "CFA_unknown"; + exp.X_op = O_symbol; + exp.X_add_symbol = symbol; + exp.X_add_number = 0; + emit_expr (&exp, size); } +#endif -struct cfi_data +struct cfi_escape_data { - enum cfi_insn insn; - long param[2]; - struct cfi_data *next; + struct cfi_escape_data *next; + expressionS exp; }; -struct cfi_info +struct cie_entry { - addressT start_address; - addressT end_address; - addressT last_address; - const char *labelname; - struct cfi_data *data; - struct cfi_info *next; + 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; }; -static struct cfi_info *cfi_info; +/* 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 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) +{ + 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. */ -static struct cfi_data * -alloc_cfi_data (void) +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) { - return (struct cfi_data *) xcalloc (sizeof (struct cfi_info), 1); + cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); } -static struct cfi_info * -alloc_cfi_info (void) -{ - return (struct cfi_info *) xcalloc (sizeof (struct cfi_info), 1); +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_sections (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 (); +} + +static 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 + { + *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_sections_set = true; + all_cfi_sections |= cfi_sections; + cfi_set_sections (); + frchain_now->frch_cfi_data->cur_cfa_offset = 0; + if (!simple) + tc_cfi_frame_initial_instructions (); + + if ((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; + } + + last_fde = frchain_now->frch_cfi_data->cur_fde_data; + + cfi_end_fde (symbol_temp_new_now ()); + + demand_empty_rest_of_line (); + + cfi_sections_set = true; + if ((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)) + { + struct dwcfi_seg_list *l; + + l = dwcfi_hash_find_or_make (cseg, base, flags); + + cseg = l->seg; + subseg_set (cseg, l->subseg); + } + else + { + cseg = subseg_new (base, 0); + bfd_set_section_flags (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; + } + + last_fde = frchain_now->frch_cfi_data->cur_fde_data; + + cfi_sections_set = true; + if ((cfi_sections & CFI_EMIT_target) != 0 + || (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 (); } -/* Parse arguments. */ -static int -cfi_parse_arg (long *param, int resolvereg) +/* 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) { - long value; - int retval = -1; - int nchars; + int data_size = fde->eh_data_size + 2; + int align_padding; + int amask; + char *p; - assert (param != NULL); - SKIP_WHITESPACE (); + fde->eh_loc = symbol_temp_new_now (); - if (sscanf (input_line_pointer, "%li%n", &value, &nchars) >= 1) + p = frag_more (1); + if (fde->personality_id != 0) + *p = fde->personality_id; + else if (fde->per_encoding != DW_EH_PE_omit) { - input_line_pointer += nchars; - retval = 1; + *p = 0; + emit_expr_encoded (&fde->personality, fde->per_encoding, false); + data_size += encoding_size (fde->per_encoding); } -#ifdef tc_regname_to_dw2regnum - else if (resolvereg && (is_name_beginner (*input_line_pointer))) - { - char *name, c, *p; + else + *p = 1; - name = input_line_pointer; - c = get_symbol_end (); - p = input_line_pointer; + amask = (1 << align) - 1; + align_padding = ((data_size + amask) & ~amask) - data_size; - if ((value = tc_regname_to_dw2regnum (name)) >= 0) - retval = 1; + p = frag_more (fde->eh_data_size + 1 + align_padding); + memcpy (p, fde->eh_data, fde->eh_data_size); + p += fde->eh_data_size; - *p = c; - } -#endif - else - as_bad (resolvereg ? - _("can't convert argument to a register number") : - _("can't convert argument to an integer")); + while (align_padding-- > 0) + *(p++) = tc_compact_eh_opcode_pad; - if (retval > 0) - *param = value; + *(p++) = tc_compact_eh_opcode_stop; + fde->eh_header_type = EH_COMPACT_OUTLINE_DONE; +} - SKIP_WHITESPACE (); - if (*input_line_pointer == ',') +/* 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) { - input_line_pointer++; - SKIP_WHITESPACE (); + as_bad (_("unexpected .cfi_inline_lsda")); + ignore_rest_of_line (); + return; } - return retval; -} - -static int -cfi_parse_reg (long *param) -{ - return cfi_parse_arg (param, 1); -} + 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; + } -static int -cfi_parse_const (long *param) -{ - return cfi_parse_arg (param, 0); -} + 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; + } -void -cfi_add_insn (enum cfi_insn insn, long param0, long param1) -{ - struct cfi_data *data_ptr; +#ifdef md_flush_pending_output + md_flush_pending_output (); +#endif - if (!cfi_info->data) + align = get_absolute_expression (); + if (align > max_alignment) { - cfi_info->data = alloc_cfi_data (); - data_ptr = cfi_info->data; + align = max_alignment; + as_bad (_("Alignment too large: %d. assumed."), align); } - else + else if (align < 0) { - data_ptr = cfi_info->data; + as_warn (_("Alignment negative: 0 assumed.")); + align = 0; + } - while (data_ptr && data_ptr->next) - data_ptr = data_ptr->next; + demand_empty_rest_of_line (); + ccseg = CUR_SEG (last_fde); - data_ptr->next = alloc_cfi_data (); + /* Open .gnu_extab section. */ + get_cfi_seg (ccseg, ".gnu_extab", + (SEC_ALLOC | SEC_LOAD | SEC_DATA + | DWARF2_EH_FRAME_READ_ONLY), + 1); - data_ptr = data_ptr->next; - } + 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); - data_ptr->insn = insn; - data_ptr->param[0] = param0; - data_ptr->param[1] = param1; -} + last_fde = NULL; + return; +} +#else /* !SUPPORT_COMPACT_EH */ static void -cfi_advance_loc (void) +dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED) { - addressT curr_address = frag_now_fix (); - if (cfi_info->last_address == curr_address) - return; - cfi_add_insn (CFA_advance_loc, - (long) (curr_address - cfi_info->last_address), 0); - cfi_info->last_address = curr_address; + as_bad (_(".cfi_inline_lsda is not supported for this target")); + ignore_rest_of_line (); } -static long -get_current_offset (struct cfi_info *info) +static void +dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED) { - long current_offset = 0; - struct cfi_data *data = info->data; - - current_offset = 0; - while (data) - { - if (data->insn == CFA_def_cfa) - current_offset = data->param[1]; - else if (data->insn == CFA_def_cfa_offset) - current_offset = data->param[0]; - data = data->next; - } - - return current_offset; + as_bad (_(".cfi_fde_data is not supported for this target")); + ignore_rest_of_line (); } static void -cfi_make_insn (int arg) +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) { - long param[2] = { 0, 0 }; + offsetT offset; + unsigned int regno; - if (!cfi_info) + switch (insn->insn) { - as_bad (_("CFI instruction used without previous .cfi_startproc")); - return; - } - - cfi_advance_loc (); + 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; - switch (arg) - { - /* Instructions that take two arguments (register, integer). */ - case CFA_offset: - case CFA_def_cfa: - if (cfi_parse_reg (¶m[0]) < 0) + case DW_CFA_def_cfa: + offset = insn->u.ri.offset; + if (offset < 0) { - as_bad (_("first argument to %s is not a register"), - cfi_insn_str (arg)); - return; + out_one (DW_CFA_def_cfa_sf); + out_uleb128 (insn->u.ri.reg); + out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT); } - if (cfi_parse_const (¶m[1]) < 0) + else { - as_bad (_("second argument to %s is not a number"), - cfi_insn_str (arg)); - return; + out_one (DW_CFA_def_cfa); + out_uleb128 (insn->u.ri.reg); + out_uleb128 (offset); } break; - /* Instructions that take one register argument. */ - case CFA_def_cfa_register: - if (cfi_parse_reg (¶m[0]) < 0) + 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 { - as_bad (_("argument to %s is not a register"), cfi_insn_str (arg)); - return; + out_one (DW_CFA_def_cfa_offset); + out_uleb128 (offset); } break; - /* Instructions that take one integer argument. */ - case CFA_def_cfa_offset: - if (cfi_parse_const (¶m[0]) < 0) + case DW_CFA_restore: + regno = insn->u.r; + if (regno <= 0x3F) + { + out_one (DW_CFA_restore + regno); + } + else { - as_bad (_("argument to %s is not a number"), cfi_insn_str (arg)); - return; + out_one (DW_CFA_restore_extended); + out_uleb128 (regno); } break; - /* Special handling for pseudo-instruction. */ - case CFI_adjust_cfa_offset: - if (cfi_parse_const (¶m[0]) < 0) + 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) { - as_bad (_("argument to %s is not a number"), - ".cfi_adjust_cfa_offset"); - return; + out_one (DW_CFA_offset + regno); + out_uleb128 (offset); + } + else + { + out_one (DW_CFA_offset_extended); + out_uleb128 (regno); + out_uleb128 (offset); } - param[0] += get_current_offset (cfi_info); - arg = CFA_def_cfa_offset; break; - default: - as_bad (_("unknown CFI instruction %d (%s)"), arg, cfi_insn_str (arg)); - return; - } - cfi_add_insn (arg, param[0], param[1]); -} - -static symbolS * -cfi_get_label (void) -{ - char symname[40], *symbase=".Llbl_cfi"; - symbolS *symbolP; - unsigned int i = 0; - - snprintf (symname, sizeof (symname), "%s_0x%lx", - symbase, (long) frag_now_fix ()); - while ((symbolP = symbol_find (symname))) - { - if ((S_GET_VALUE (symbolP) == frag_now_fix ()) - && (S_GET_SEGMENT (symbolP) == now_seg)) + case DW_CFA_val_offset: + regno = insn->u.ri.reg; + offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; + if (offset < 0) { - return symbolP; + out_one (DW_CFA_val_offset_sf); + out_uleb128 (regno); + out_sleb128 (offset); } - snprintf (symname, sizeof (symname), "%s_0x%lx_%u", - symbase, (long) frag_now_fix (), i++); - } - symbolP = (symbolS *) local_symbol_make (symname, now_seg, - (valueT) frag_now_fix (), - frag_now); - return symbolP; -} + else + { + out_one (DW_CFA_val_offset); + out_uleb128 (regno); + out_uleb128 (offset); + } + break; -static void -dot_cfi_startproc (void) -{ - if (cfi_info) - { - as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); - return; - } + case DW_CFA_register: + out_one (DW_CFA_register); + out_uleb128 (insn->u.rr.reg1); + out_uleb128 (insn->u.rr.reg2); + break; - cfi_info = alloc_cfi_info (); + case DW_CFA_remember_state: + case DW_CFA_restore_state: + out_one (insn->insn); + break; - cfi_info->start_address = frag_now_fix (); - cfi_info->last_address = cfi_info->start_address; - cfi_info->labelname = S_GET_NAME (cfi_get_label ()); + case DW_CFA_GNU_window_save: + out_one (DW_CFA_GNU_window_save); + break; -#ifdef tc_cfi_frame_initial_instructions - tc_cfi_frame_initial_instructions (); + 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 -} - -#define cfi_is_advance_insn(insn) \ - ((insn >= CFA_set_loc && insn <= CFA_advance_loc4) \ - || insn == CFA_advance_loc) + } + } + emit_expr (&insn->u.ea.exp, enc_size); + } + break; -enum data_types - { - t_ascii = 0, - t_byte = 1, - t_half = 2, - t_long = 4, - t_quad = 8, - t_uleb128 = 0x10, - t_sleb128 = 0x11 - }; + case CFI_label: + colon (insn->u.sym_name); + break; -/* Output CFI instructions to the file. */ + default: + abort (); + } +} -static int -output_data (char **p, unsigned long *size, enum data_types type, long value) +static void +output_cie (struct cie_entry *cie, bool eh_frame, int align) { - char *ptr = *p; - unsigned int ret_size; - - switch (type) + 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 { - case t_byte: - ret_size = 1; - break; - case t_half: - ret_size = 2; - break; - case t_long: - ret_size = 4; - break; - case t_quad: - case t_uleb128: - case t_sleb128: - ret_size = 8; - break; - default: - as_warn (_("unknown type %d"), type); - return 0; + if (fmt == dwarf2_format_64bit) + out_four (-1); + emit_expr (&exp, 8); /* Length. */ } - - if (*size < ret_size) + 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) { - as_bad (_("output_data buffer is too small")); - return 0; + 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 (type) + switch (DWARF2_FDE_RELOC_SIZE) { - case t_byte: - *ptr = (char) value; - if (verbose) - printf ("\t.byte\t0x%x\n", (unsigned char) *ptr); - break; - case t_half: - *(short *) ptr = (short) value & 0xFFFF; - if (verbose) - printf ("\t.half\t0x%x\n", (unsigned short) *ptr); - break; - case t_long: - *(int *) ptr = (int) value & 0xFFFFFFFF; - if (verbose) - printf ("\t.long\t0x%x\n", (unsigned int) *ptr); + case 2: + enc = DW_EH_PE_sdata2; break; - case t_quad: - *(long long *) ptr = (long long) value & 0xFFFFFFFF; - if (verbose) - printf ("\t.quad\t0x%x\n", (unsigned int) *ptr); + case 4: + enc = DW_EH_PE_sdata4; break; - case t_uleb128: - case t_sleb128: - ret_size = output_leb128 (ptr, value, type == t_sleb128); - if (verbose) - printf ("\t.%s\t0x%lx\n", - type == t_sleb128 ? "sleb128" : "uleb128", - value); + case 8: + enc = DW_EH_PE_sdata8; break; default: - as_warn ("unknown type %d", type); - return 0; + 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); - *size -= ret_size; - *p += ret_size; + 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); + } + } - return ret_size; + frag_align (align, DW_CFA_nop, 0); + symbol_set_value_now (end_address); } -static int -cfi_output_insn (struct cfi_data *data, char **buf, unsigned long *buf_size) +static void +output_fde (struct fde_entry *fde, struct cie_entry *cie, + bool eh_frame, struct cfi_insn_data *first, + int align) { - char **pbuf = buf, *orig_buf = *buf; - unsigned long size; + 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 (!data || !buf) - as_fatal (_("cfi_output_insn called with NULL pointer")); + 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); + } - switch (data->insn) + exp.X_op = O_symbol; + if (eh_frame) { - case CFA_advance_loc: - if (verbose) - printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn), - data->param[0]); - if (data->param[0] <= 0x3F) - { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc + - (data->param[0] / current_config.code_align)); - } - else if (data->param[0] <= 0xFF) - { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc1); - output_data (pbuf, buf_size, t_byte, - data->param[0] / current_config.code_align); - } - else if (data->param[0] <= 0xFFFF) + 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) { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc2); - output_data (pbuf, buf_size, t_half, - data->param[0] / current_config.code_align); + 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 { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc4); - output_data (pbuf, buf_size, t_long, - data->param[0] / current_config.code_align); + 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 } - break; + } + else + { + exp.X_add_number = 0; + exp.X_add_symbol = fde->start_address; + addr_size = DWARF2_ADDR_SIZE (stdoutput); + emit_expr (&exp, addr_size); + } - case CFA_def_cfa: - if (verbose) - printf ("\t# CFA_def_cfa(%ld,%ld)\n", data->param[0], data->param[1]); - output_data (pbuf, buf_size, t_byte, CFA_def_cfa); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); - output_data (pbuf, buf_size, t_uleb128, data->param[1]); - break; + 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); - case CFA_def_cfa_register: - case CFA_def_cfa_offset: - if (verbose) - printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn), - data->param[0]); - output_data (pbuf, buf_size, t_byte, data->insn); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); + 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 CFA_offset: - if (verbose) - printf ("\t# %s(%ld,%ld)\n", cfi_insn_str (data->insn), - data->param[0], data->param[1]); + 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; - /* Check whether to use CFA_offset or CFA_offset_extended. */ - if (data->param[0] <= 0x3F) - output_data (pbuf, buf_size, t_byte, CFA_offset + data->param[0]); - else + case DW_CFA_def_cfa_register: + case DW_CFA_restore: + case DW_CFA_undefined: + case DW_CFA_same_value: + if (j) { - output_data (pbuf, buf_size, t_byte, CFA_offset_extended); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); + if (i->u.r != j->u.r) + return false; } - output_data (pbuf, buf_size, t_uleb128, - data->param[1] / current_config.data_align); break; - case CFA_nop: - if (verbose) - printf ("\t# CFA_nop\n"); - output_data (pbuf, buf_size, t_byte, CFA_nop); + case DW_CFA_def_cfa_offset: + if (j) + { + if (i->u.i != j->u.i) + return false; + } break; default: - as_warn ("CFA_unknown[%d](%ld,%ld)", data->insn, - data->param[0], data->param[1]); + return false; } - size = *pbuf - orig_buf; - *buf = *pbuf; - *buf_size -= size; - return size; + return true; } -static void -dot_cfi_endproc (void) +static struct cie_entry * +select_cie_for_fde (struct fde_entry *fde, bool eh_frame, + struct cfi_insn_data **pfirst, int align) { - struct cfi_data *data_ptr; - char *cie_buf, *fde_buf, *pbuf, *where; - unsigned long buf_size, cie_size, fde_size, last_cie_offset; - unsigned long fde_initloc_offset, fde_len_offset; - void *saved_seg, *cfi_seg; - expressionS exp; + struct cfi_insn_data *i, *j; + struct cie_entry *cie; - if (! cfi_info) + for (cie = cie_root; cie; cie = cie->next) { - as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); - return; + 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; + } } - cfi_info->end_address = frag_now_fix (); - /* Open .eh_frame section. */ - saved_seg = now_seg; - cfi_seg = subseg_new (".eh_frame", 0); - bfd_set_section_flags (stdoutput, cfi_seg, - SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA); - subseg_set (cfi_seg, 0); + 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; - /* Build CIE. */ - cie_buf = xcalloc (1024, 1); - /* Skip space for CIE length. */ - pbuf = cie_buf + 4; - buf_size = 1020; + cie->last = i; + *pfirst = i; - if (verbose) - printf ("# CIE *****\n"); + output_cie (cie, eh_frame, align); - /* CIE id. */ - output_data (&pbuf, &buf_size, t_long, 0x0); - /* Version. */ - output_data (&pbuf, &buf_size, t_byte, 1); - /* Augmentation. */ - output_data (&pbuf, &buf_size, t_byte, 0); - /* Code alignment. */ - output_data (&pbuf, &buf_size, t_uleb128, current_config.code_align); - /* Data alignment. */ - output_data (&pbuf, &buf_size, t_sleb128, current_config.data_align); - /* Return address column. */ - output_data (&pbuf, &buf_size, t_byte, current_config.ra_column); + return cie; +} - /* Build CFI instructions. */ - data_ptr = cfi_info->data; - while (data_ptr && !cfi_is_advance_insn (data_ptr->insn)) +#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) { - cfi_output_insn (data_ptr, &pbuf, &buf_size); - data_ptr = data_ptr->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 - /* Align the whole data to current_config.eh_align. */ - cie_size = pbuf - cie_buf; - cie_size += current_config.eh_align - cie_size % current_config.eh_align; +#if SUPPORT_COMPACT_EH +static void +cfi_emit_eh_header (symbolS *sym, bfd_vma addend) +{ + expressionS exp; - /* CIE length. */ - pbuf = cie_buf; - output_data (&pbuf, &buf_size, t_long, cie_size - 4); + exp.X_add_number = addend; + exp.X_add_symbol = sym; + emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, false); +} - /* OK, we built the CIE. Let's write it to the file... */ - last_cie_offset = frag_now_fix (); - where = (unsigned char *) frag_more (cie_size); - memcpy (where, cie_buf, cie_size); +static void +output_eh_header (struct fde_entry *fde) +{ + char *p; + bfd_vma addend; - /* Clean up. */ - free (cie_buf); + if (fde->eh_header_type == EH_COMPACT_INLINE) + addend = 0; + else + addend = 1; - /* Build the FDE... */ - fde_buf = xcalloc (1024, 1); - pbuf = fde_buf; - buf_size = 1024; + cfi_emit_eh_header (fde->start_address, addend); - if (verbose) + if (fde->eh_header_type == EH_COMPACT_INLINE) { - printf ("# FDE: start=0x%lx, end=0x%lx, delta=%d\n", - (long) cfi_info->start_address, - (long) cfi_info->end_address, - (int) (cfi_info->end_address - cfi_info->start_address)); + 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 - /* FDE length (t_long, 4 bytes) - will be set later. */ - fde_len_offset = pbuf - fde_buf; - pbuf += 4; - buf_size -= 4; - - /* CIE pointer - offset from here. */ - output_data (&pbuf, &buf_size, t_long, cie_size + 4); - - /* FDE initial location - this must be set relocatable! */ - fde_initloc_offset = pbuf - fde_buf; - output_data (&pbuf, &buf_size, current_config.addr_length, - cfi_info->start_address); +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; - /* FDE address range. */ - output_data (&pbuf, &buf_size, current_config.addr_length, - cfi_info->end_address - cfi_info->start_address); + if (all_fde_data == 0) + return; - while (data_ptr) + cfi_sections_set = true; + if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0 + || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0) { - cfi_output_insn (data_ptr, &pbuf, &buf_size); - data_ptr = data_ptr->next; - } - - fde_size = pbuf - fde_buf; - fde_size += current_config.eh_align - fde_size % current_config.eh_align; + /* Make sure check_eh_frame doesn't do anything with our output. */ + save_flag_traditional_format = flag_traditional_format; + flag_traditional_format = 1; - /* Now we can set FDE length. */ - pbuf = fde_buf + fde_len_offset; - buf_size = 4; - output_data (&pbuf, &buf_size, t_long, fde_size - 4); + 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 + } - /* Adjust initloc offset. */ - fde_initloc_offset += frag_now_fix (); + 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); - /* Copy FDE to objfile. */ - where = (unsigned char *) frag_more (fde_size); - memcpy (where, fde_buf, fde_size); + if (EH_FRAME_LINKONCE) + for (fde = all_fde_data; fde ; fde = fde->next) + SET_HANDLED (fde, 0); - /* Set relocation for initial address. */ - buf_size = current_config.addr_length; - memset (&exp, 0, sizeof (exp)); - exp.X_op = O_symbol; - exp.X_add_symbol = symbol_find (cfi_info->labelname); - fix_new_exp (frag_now, fde_initloc_offset, - current_config.addr_length, - &exp, 0, current_config.reloc_type); +#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 */ - /* Clean up. */ - free (fde_buf); + flag_traditional_format = save_flag_traditional_format; + } - free (cfi_info); - cfi_info = NULL; + cfi_sections_set = true; + if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0) + { + int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; - /* Restore previous segment. */ - subseg_set (saved_seg, 0); -} + if (!SUPPORT_FRAME_LINKONCE) + get_cfi_seg (NULL, ".debug_frame", + SEC_READONLY | SEC_DEBUGGING, + alignment); -void -dot_cfi (int arg) -{ - long param; + 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); - switch (arg) - { - case CFI_startproc: - dot_cfi_startproc (); - break; - case CFI_endproc: - dot_cfi_endproc (); - break; - case CFA_def_cfa: - case CFA_def_cfa_register: - case CFA_def_cfa_offset: - case CFA_offset: - case CFI_adjust_cfa_offset: - cfi_make_insn (arg); - break; - case CFI_verbose: - if (cfi_parse_const (¶m) >= 0) - verbose = (int) param; - else - verbose = 1; - break; - default: - as_bad (_("unknown CFI code 0x%x (%s)"), arg, cfi_insn_str (arg)); - break; + if (SUPPORT_FRAME_LINKONCE) + for (fde = all_fde_data; fde ; fde = fde->next) + SET_HANDLED (fde, 0); } - ignore_rest_of_line (); + if (dwcfi_hash) + htab_delete (dwcfi_hash); } -void -cfi_set_config (struct cfi_config *cfg) -{ - assert (cfg != NULL); - assert (cfg->addr_length > 0); +#else /* TARGET_USE_CFIPOP */ + +/* Emit an intelligible error message for missing support. */ - current_config = *cfg; +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) { - if (cfi_info) - as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); } +#endif /* TARGET_USE_CFIPOP */