X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=bfd%2Felf-eh-frame.c;h=8c3712f7f23a906a5fa08df8955a686d47a0c222;hb=999bf65c4b277ffc40dc32f377cf99de0f9684b3;hp=ab0b995c0c238f485907b84bd331822cb284c420;hpb=63752a757f91daffcdfd0ee426067d770955e47d;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c index ab0b995c0c..8c3712f7f2 100644 --- a/bfd/elf-eh-frame.c +++ b/bfd/elf-eh-frame.c @@ -1,12 +1,12 @@ /* .eh_frame section optimization. - Copyright 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + Copyright (C) 2001-2014 Free Software Foundation, Inc. Written by Jakub Jelinek . This file is part of BFD, the Binary File Descriptor library. This program 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 of the License, or + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -16,16 +16,45 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ -#include "bfd.h" #include "sysdep.h" +#include "bfd.h" #include "libbfd.h" #include "elf-bfd.h" -#include "elf/dwarf2.h" +#include "dwarf2.h" #define EH_FRAME_HDR_SIZE 8 +struct cie +{ + unsigned int length; + unsigned int hash; + unsigned char version; + unsigned char local_personality; + char augmentation[20]; + bfd_vma code_align; + bfd_signed_vma data_align; + bfd_vma ra_column; + bfd_vma augmentation_size; + union { + struct elf_link_hash_entry *h; + bfd_vma val; + unsigned int reloc_index; + } personality; + asection *output_sec; + struct eh_cie_fde *cie_inf; + unsigned char per_encoding; + unsigned char lsda_encoding; + unsigned char fde_encoding; + unsigned char initial_insn_length; + unsigned char can_make_lsda_relative; + unsigned char initial_instructions[50]; +}; + + + /* If *ITER hasn't reached END yet, read the next byte into *RESULT and move onto the next byte. Return true on success. */ @@ -180,30 +209,71 @@ write_value (bfd *abfd, bfd_byte *buf, bfd_vma value, int width) } } -/* Return zero if C1 and C2 CIEs can be merged. */ +/* Return one if C1 and C2 CIEs can be merged. */ -static -int cie_compare (struct cie *c1, struct cie *c2) +static int +cie_eq (const void *e1, const void *e2) { - if (c1->hdr.length == c2->hdr.length + const struct cie *c1 = (const struct cie *) e1; + const struct cie *c2 = (const struct cie *) e2; + + if (c1->hash == c2->hash + && c1->length == c2->length && c1->version == c2->version + && c1->local_personality == c2->local_personality && strcmp (c1->augmentation, c2->augmentation) == 0 && strcmp (c1->augmentation, "eh") != 0 && c1->code_align == c2->code_align && c1->data_align == c2->data_align && c1->ra_column == c2->ra_column && c1->augmentation_size == c2->augmentation_size - && c1->personality == c2->personality + && memcmp (&c1->personality, &c2->personality, + sizeof (c1->personality)) == 0 + && c1->output_sec == c2->output_sec && c1->per_encoding == c2->per_encoding && c1->lsda_encoding == c2->lsda_encoding && c1->fde_encoding == c2->fde_encoding && c1->initial_insn_length == c2->initial_insn_length + && c1->initial_insn_length <= sizeof (c1->initial_instructions) && memcmp (c1->initial_instructions, c2->initial_instructions, c1->initial_insn_length) == 0) - return 0; + return 1; - return 1; + return 0; +} + +static hashval_t +cie_hash (const void *e) +{ + const struct cie *c = (const struct cie *) e; + return c->hash; +} + +static hashval_t +cie_compute_hash (struct cie *c) +{ + hashval_t h = 0; + size_t len; + h = iterative_hash_object (c->length, h); + h = iterative_hash_object (c->version, h); + h = iterative_hash (c->augmentation, strlen (c->augmentation) + 1, h); + h = iterative_hash_object (c->code_align, h); + h = iterative_hash_object (c->data_align, h); + h = iterative_hash_object (c->ra_column, h); + h = iterative_hash_object (c->augmentation_size, h); + h = iterative_hash_object (c->personality, h); + h = iterative_hash_object (c->output_sec, h); + h = iterative_hash_object (c->per_encoding, h); + h = iterative_hash_object (c->lsda_encoding, h); + h = iterative_hash_object (c->fde_encoding, h); + h = iterative_hash_object (c->initial_insn_length, h); + len = c->initial_insn_length; + if (len > sizeof (c->initial_instructions)) + len = sizeof (c->initial_instructions); + h = iterative_hash (c->initial_instructions, len, h); + c->hash = h; + return h; } /* Return the number of extra bytes that we'll be inserting into @@ -217,7 +287,7 @@ extra_augmentation_string_bytes (struct eh_cie_fde *entry) { if (entry->add_augmentation_size) size++; - if (entry->add_fde_encoding) + if (entry->u.cie.add_fde_encoding) size++; } return size; @@ -229,18 +299,10 @@ static INLINE unsigned int extra_augmentation_data_bytes (struct eh_cie_fde *entry) { unsigned int size = 0; - if (entry->cie) - { - if (entry->add_augmentation_size) - size++; - if (entry->add_fde_encoding) - size++; - } - else - { - if (entry->cie_inf->add_augmentation_size) - size++; - } + if (entry->add_augmentation_size) + size++; + if (entry->cie && entry->u.cie.add_fde_encoding) + size++; return size; } @@ -273,11 +335,14 @@ skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) if (!read_byte (iter, end, &op)) return FALSE; - switch (op & 0x80 ? op & 0xc0 : op) + switch (op & 0xc0 ? op & 0xc0 : op) { case DW_CFA_nop: case DW_CFA_advance_loc: case DW_CFA_restore: + case DW_CFA_remember_state: + case DW_CFA_restore_state: + case DW_CFA_GNU_window_save: /* No arguments. */ return TRUE; @@ -292,6 +357,8 @@ skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) /* One leb128 argument. */ return skip_leb128 (iter, end); + case DW_CFA_val_offset: + case DW_CFA_val_offset_sf: case DW_CFA_offset_extended: case DW_CFA_register: case DW_CFA_def_cfa: @@ -308,6 +375,7 @@ skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) && skip_bytes (iter, end, length)); case DW_CFA_expression: + case DW_CFA_val_expression: /* A leb128 followed by a variable-length argument. */ return (skip_leb128 (iter, end) && read_uleb128 (iter, end, &length) @@ -339,7 +407,8 @@ skip_cfa_op (bfd_byte **iter, bfd_byte *end, unsigned int encoded_ptr_width) ENCODED_PTR_WIDTH is as for skip_cfa_op. */ static bfd_byte * -skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width) +skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width, + unsigned int *set_loc_count) { bfd_byte *last; @@ -349,6 +418,8 @@ skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width) buf++; else { + if (*buf == DW_CFA_set_loc) + ++*set_loc_count; if (!skip_cfa_op (&buf, end, encoded_ptr_width)) return 0; last = buf; @@ -356,16 +427,47 @@ skip_non_nops (bfd_byte *buf, bfd_byte *end, unsigned int encoded_ptr_width) return last; } -/* This function is called for each input file before the .eh_frame - section is relocated. It discards duplicate CIEs and FDEs for discarded - functions. The function returns TRUE iff any entries have been - deleted. */ +/* Convert absolute encoding ENCODING into PC-relative form. + SIZE is the size of a pointer. */ -bfd_boolean -_bfd_elf_discard_section_eh_frame - (bfd *abfd, struct bfd_link_info *info, asection *sec, - bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), - struct elf_reloc_cookie *cookie) +static unsigned char +make_pc_relative (unsigned char encoding, unsigned int ptr_size) +{ + if ((encoding & 0x7f) == DW_EH_PE_absptr) + switch (ptr_size) + { + case 2: + encoding |= DW_EH_PE_sdata2; + break; + case 4: + encoding |= DW_EH_PE_sdata4; + break; + case 8: + encoding |= DW_EH_PE_sdata8; + break; + } + return encoding | DW_EH_PE_pcrel; +} + +/* Called before calling _bfd_elf_parse_eh_frame on every input bfd's + .eh_frame section. */ + +void +_bfd_elf_begin_eh_frame_parsing (struct bfd_link_info *info) +{ + struct eh_frame_hdr_info *hdr_info; + + hdr_info = &elf_hash_table (info)->eh_info; + hdr_info->merge_cies = !info->relocatable; +} + +/* Try to parse .eh_frame section SEC, which belongs to ABFD. Store the + information in the section's sec_info field on success. COOKIE + describes the relocations in SEC. */ + +void +_bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, + asection *sec, struct elf_reloc_cookie *cookie) { #define REQUIRE(COND) \ do \ @@ -373,34 +475,39 @@ _bfd_elf_discard_section_eh_frame goto free_no_table; \ while (0) - bfd_byte *ehbuf = NULL, *buf; - bfd_byte *last_cie, *last_fde; - struct eh_cie_fde *ent, *last_cie_inf, *this_inf; - struct cie_header hdr; - struct cie cie; + bfd_byte *ehbuf = NULL, *buf, *end; + bfd_byte *last_fde; + struct eh_cie_fde *this_inf; + unsigned int hdr_length, hdr_id; + unsigned int cie_count; + struct cie *cie, *local_cies = NULL; struct elf_link_hash_table *htab; struct eh_frame_hdr_info *hdr_info; struct eh_frame_sec_info *sec_info = NULL; - unsigned int cie_usage_count, offset; unsigned int ptr_size; + unsigned int num_cies; + unsigned int num_entries; + elf_gc_mark_hook_fn gc_mark_hook; - if (sec->size == 0) + htab = elf_hash_table (info); + hdr_info = &htab->eh_info; + if (hdr_info->parsed_eh_frames) + return; + + if (sec->size == 0 + || sec->sec_info_type != SEC_INFO_TYPE_NONE) { /* This file does not contain .eh_frame information. */ - return FALSE; + return; } - if ((sec->output_section != NULL - && bfd_is_abs_section (sec->output_section))) + if (bfd_is_abs_section (sec->output_section)) { /* At least one of the sections is being discarded from the link, so we should just ignore them. */ - return FALSE; + return; } - htab = elf_hash_table (info); - hdr_info = &htab->eh_info; - /* Read the frame unwind information from abfd. */ REQUIRE (bfd_malloc_and_get_section (abfd, sec, &ehbuf)); @@ -411,7 +518,7 @@ _bfd_elf_discard_section_eh_frame { /* Empty .eh_frame section. */ free (ehbuf); - return FALSE; + return; } /* If .eh_frame section size doesn't fit into int, we cannot handle @@ -422,150 +529,124 @@ _bfd_elf_discard_section_eh_frame ->elf_backend_eh_frame_address_size (abfd, sec)); REQUIRE (ptr_size != 0); + /* Go through the section contents and work out how many FDEs and + CIEs there are. */ buf = ehbuf; - last_cie = NULL; - last_cie_inf = NULL; - memset (&cie, 0, sizeof (cie)); - cie_usage_count = 0; - sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info) - + 99 * sizeof (struct eh_cie_fde)); + end = ehbuf + sec->size; + num_cies = 0; + num_entries = 0; + while (buf != end) + { + num_entries++; + + /* Read the length of the entry. */ + REQUIRE (skip_bytes (&buf, end, 4)); + hdr_length = bfd_get_32 (abfd, buf - 4); + + /* 64-bit .eh_frame is not supported. */ + REQUIRE (hdr_length != 0xffffffff); + if (hdr_length == 0) + break; + + REQUIRE (skip_bytes (&buf, end, 4)); + hdr_id = bfd_get_32 (abfd, buf - 4); + if (hdr_id == 0) + num_cies++; + + REQUIRE (skip_bytes (&buf, end, hdr_length - 4)); + } + + sec_info = (struct eh_frame_sec_info *) + bfd_zmalloc (sizeof (struct eh_frame_sec_info) + + (num_entries - 1) * sizeof (struct eh_cie_fde)); REQUIRE (sec_info); - sec_info->alloced = 100; + /* We need to have a "struct cie" for each CIE in this section. */ + local_cies = (struct cie *) bfd_zmalloc (num_cies * sizeof (*local_cies)); + REQUIRE (local_cies); + /* FIXME: octets_per_byte. */ #define ENSURE_NO_RELOCS(buf) \ REQUIRE (!(cookie->rel < cookie->relend \ && (cookie->rel->r_offset \ < (bfd_size_type) ((buf) - ehbuf)) \ && cookie->rel->r_info != 0)) + /* FIXME: octets_per_byte. */ #define SKIP_RELOCS(buf) \ while (cookie->rel < cookie->relend \ && (cookie->rel->r_offset \ < (bfd_size_type) ((buf) - ehbuf))) \ cookie->rel++ + /* FIXME: octets_per_byte. */ #define GET_RELOC(buf) \ ((cookie->rel < cookie->relend \ && (cookie->rel->r_offset \ == (bfd_size_type) ((buf) - ehbuf))) \ ? cookie->rel : NULL) - for (;;) + buf = ehbuf; + cie_count = 0; + gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; + while ((bfd_size_type) (buf - ehbuf) != sec->size) { char *aug; - bfd_byte *start, *end, *insns; + bfd_byte *start, *insns, *insns_end; bfd_size_type length; - - if (sec_info->count == sec_info->alloced) - { - struct eh_cie_fde *old_entry = sec_info->entry; - sec_info = bfd_realloc (sec_info, - sizeof (struct eh_frame_sec_info) - + ((sec_info->alloced + 99) - * sizeof (struct eh_cie_fde))); - REQUIRE (sec_info); - - memset (&sec_info->entry[sec_info->alloced], 0, - 100 * sizeof (struct eh_cie_fde)); - sec_info->alloced += 100; - - /* Now fix any pointers into the array. */ - if (last_cie_inf >= old_entry - && last_cie_inf < old_entry + sec_info->count) - last_cie_inf = sec_info->entry + (last_cie_inf - old_entry); - } + unsigned int set_loc_count; this_inf = sec_info->entry + sec_info->count; last_fde = buf; - /* If we are at the end of the section, we still need to decide - on whether to output or discard last encountered CIE (if any). */ - if ((bfd_size_type) (buf - ehbuf) == sec->size) - { - hdr.length = 0; - hdr.id = (unsigned int) -1; - end = buf; - } - else - { - /* Read the length of the entry. */ - REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); - hdr.length = bfd_get_32 (abfd, buf - 4); - /* 64-bit .eh_frame is not supported. */ - REQUIRE (hdr.length != 0xffffffff); + /* Read the length of the entry. */ + REQUIRE (skip_bytes (&buf, ehbuf + sec->size, 4)); + hdr_length = bfd_get_32 (abfd, buf - 4); - /* The CIE/FDE must be fully contained in this input section. */ - REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr.length <= sec->size); - end = buf + hdr.length; + /* The CIE/FDE must be fully contained in this input section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) + hdr_length <= sec->size); + end = buf + hdr_length; - this_inf->offset = last_fde - ehbuf; - this_inf->size = 4 + hdr.length; + this_inf->offset = last_fde - ehbuf; + this_inf->size = 4 + hdr_length; + this_inf->reloc_index = cookie->rel - cookie->rels; - if (hdr.length == 0) - { - /* A zero-length CIE should only be found at the end of - the section. */ - REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); - ENSURE_NO_RELOCS (buf); - sec_info->count++; - /* Now just finish last encountered CIE processing and break - the loop. */ - hdr.id = (unsigned int) -1; - } - else - { - REQUIRE (skip_bytes (&buf, end, 4)); - hdr.id = bfd_get_32 (abfd, buf - 4); - REQUIRE (hdr.id != (unsigned int) -1); - } + if (hdr_length == 0) + { + /* A zero-length CIE should only be found at the end of + the section. */ + REQUIRE ((bfd_size_type) (buf - ehbuf) == sec->size); + ENSURE_NO_RELOCS (buf); + sec_info->count++; + break; } - if (hdr.id == 0 || hdr.id == (unsigned int) -1) + REQUIRE (skip_bytes (&buf, end, 4)); + hdr_id = bfd_get_32 (abfd, buf - 4); + + if (hdr_id == 0) { unsigned int initial_insn_length; /* CIE */ - if (last_cie != NULL) - { - /* Now check if this CIE is identical to the last CIE, - in which case we can remove it provided we adjust - all FDEs. Also, it can be removed if we have removed - all FDEs using it. */ - if ((!info->relocatable - && hdr_info->last_cie_sec - && (sec->output_section - == hdr_info->last_cie_sec->output_section) - && cie_compare (&cie, &hdr_info->last_cie) == 0) - || cie_usage_count == 0) - last_cie_inf->removed = 1; - else - { - hdr_info->last_cie = cie; - hdr_info->last_cie_sec = sec; - last_cie_inf->make_relative = cie.make_relative; - last_cie_inf->make_lsda_relative = cie.make_lsda_relative; - last_cie_inf->per_encoding_relative - = (cie.per_encoding & 0x70) == DW_EH_PE_pcrel; - } - } - - if (hdr.id == (unsigned int) -1) - break; - - last_cie_inf = this_inf; this_inf->cie = 1; - cie_usage_count = 0; - memset (&cie, 0, sizeof (cie)); - cie.hdr = hdr; - REQUIRE (read_byte (&buf, end, &cie.version)); + /* Point CIE to one of the section-local cie structures. */ + cie = local_cies + cie_count++; + + cie->cie_inf = this_inf; + cie->length = hdr_length; + cie->output_sec = sec->output_section; + start = buf; + REQUIRE (read_byte (&buf, end, &cie->version)); /* Cannot handle unknown versions. */ - REQUIRE (cie.version == 1 || cie.version == 3); - REQUIRE (strlen ((char *) buf) < sizeof (cie.augmentation)); + REQUIRE (cie->version == 1 + || cie->version == 3 + || cie->version == 4); + REQUIRE (strlen ((char *) buf) < sizeof (cie->augmentation)); - strcpy (cie.augmentation, (char *) buf); + strcpy (cie->augmentation, (char *) buf); buf = (bfd_byte *) strchr ((char *) buf, '\0') + 1; ENSURE_NO_RELOCS (buf); if (buf[0] == 'e' && buf[1] == 'h') @@ -577,26 +658,33 @@ _bfd_elf_discard_section_eh_frame REQUIRE (skip_bytes (&buf, end, ptr_size)); SKIP_RELOCS (buf); } - REQUIRE (read_uleb128 (&buf, end, &cie.code_align)); - REQUIRE (read_sleb128 (&buf, end, &cie.data_align)); - if (cie.version == 1) + if (cie->version >= 4) + { + REQUIRE (buf + 1 < end); + REQUIRE (buf[0] == ptr_size); + REQUIRE (buf[1] == 0); + buf += 2; + } + REQUIRE (read_uleb128 (&buf, end, &cie->code_align)); + REQUIRE (read_sleb128 (&buf, end, &cie->data_align)); + if (cie->version == 1) { REQUIRE (buf < end); - cie.ra_column = *buf++; + cie->ra_column = *buf++; } else - REQUIRE (read_uleb128 (&buf, end, &cie.ra_column)); + REQUIRE (read_uleb128 (&buf, end, &cie->ra_column)); ENSURE_NO_RELOCS (buf); - cie.lsda_encoding = DW_EH_PE_omit; - cie.fde_encoding = DW_EH_PE_omit; - cie.per_encoding = DW_EH_PE_omit; - aug = cie.augmentation; + cie->lsda_encoding = DW_EH_PE_omit; + cie->fde_encoding = DW_EH_PE_omit; + cie->per_encoding = DW_EH_PE_omit; + aug = cie->augmentation; if (aug[0] != 'e' || aug[1] != 'h') { if (*aug == 'z') { aug++; - REQUIRE (read_uleb128 (&buf, end, &cie.augmentation_size)); + REQUIRE (read_uleb128 (&buf, end, &cie->augmentation_size)); ENSURE_NO_RELOCS (buf); } @@ -604,14 +692,14 @@ _bfd_elf_discard_section_eh_frame switch (*aug++) { case 'L': - REQUIRE (read_byte (&buf, end, &cie.lsda_encoding)); + REQUIRE (read_byte (&buf, end, &cie->lsda_encoding)); ENSURE_NO_RELOCS (buf); - REQUIRE (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size)); + REQUIRE (get_DW_EH_PE_width (cie->lsda_encoding, ptr_size)); break; case 'R': - REQUIRE (read_byte (&buf, end, &cie.fde_encoding)); + REQUIRE (read_byte (&buf, end, &cie->fde_encoding)); ENSURE_NO_RELOCS (buf); - REQUIRE (get_DW_EH_PE_width (cie.fde_encoding, ptr_size)); + REQUIRE (get_DW_EH_PE_width (cie->fde_encoding, ptr_size)); break; case 'S': break; @@ -619,47 +707,25 @@ _bfd_elf_discard_section_eh_frame { int per_width; - REQUIRE (read_byte (&buf, end, &cie.per_encoding)); - per_width = get_DW_EH_PE_width (cie.per_encoding, + REQUIRE (read_byte (&buf, end, &cie->per_encoding)); + per_width = get_DW_EH_PE_width (cie->per_encoding, ptr_size); REQUIRE (per_width); - if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned) + if ((cie->per_encoding & 0x70) == DW_EH_PE_aligned) { length = -(buf - ehbuf) & (per_width - 1); REQUIRE (skip_bytes (&buf, end, length)); } + this_inf->u.cie.personality_offset = buf - start; ENSURE_NO_RELOCS (buf); - /* Ensure we have a reloc here, against - a global symbol. */ - if (GET_RELOC (buf) != NULL) - { - unsigned long r_symndx; - -#ifdef BFD64 - if (ptr_size == 8) - r_symndx = ELF64_R_SYM (cookie->rel->r_info); - else -#endif - r_symndx = ELF32_R_SYM (cookie->rel->r_info); - if (r_symndx >= cookie->locsymcount) - { - struct elf_link_hash_entry *h; - - r_symndx -= cookie->extsymoff; - h = cookie->sym_hashes[r_symndx]; - - while (h->root.type == bfd_link_hash_indirect - || h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) - h->root.u.i.link; - - cie.personality = h; - } - /* Cope with MIPS-style composite relocations. */ - do - cookie->rel++; - while (GET_RELOC (buf) != NULL); - } + /* Ensure we have a reloc here. */ + REQUIRE (GET_RELOC (buf)); + cie->personality.reloc_index + = cookie->rel - cookie->rels; + /* Cope with MIPS-style composite relocations. */ + do + cookie->rel++; + while (GET_RELOC (buf) != NULL); REQUIRE (skip_bytes (&buf, end, per_width)); } break; @@ -676,80 +742,85 @@ _bfd_elf_discard_section_eh_frame ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) { - if ((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr) - cie.make_relative = 1; + if ((cie->fde_encoding & 0x70) == DW_EH_PE_absptr) + this_inf->make_relative = 1; /* If the CIE doesn't already have an 'R' entry, it's fairly easy to add one, provided that there's no aligned data after the augmentation string. */ - else if (cie.fde_encoding == DW_EH_PE_omit - && (cie.per_encoding & 0xf0) != DW_EH_PE_aligned) + else if (cie->fde_encoding == DW_EH_PE_omit + && (cie->per_encoding & 0x70) != DW_EH_PE_aligned) { - if (*cie.augmentation == 0) + if (*cie->augmentation == 0) this_inf->add_augmentation_size = 1; - this_inf->add_fde_encoding = 1; - cie.make_relative = 1; + this_inf->u.cie.add_fde_encoding = 1; + this_inf->make_relative = 1; } - } - if (info->shared - && (get_elf_backend_data (abfd) - ->elf_backend_can_make_lsda_relative_eh_frame - (abfd, info, sec)) - && (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr) - cie.make_lsda_relative = 1; + if ((cie->lsda_encoding & 0x70) == DW_EH_PE_absptr) + cie->can_make_lsda_relative = 1; + } /* If FDE encoding was not specified, it defaults to DW_EH_absptr. */ - if (cie.fde_encoding == DW_EH_PE_omit) - cie.fde_encoding = DW_EH_PE_absptr; + if (cie->fde_encoding == DW_EH_PE_omit) + cie->fde_encoding = DW_EH_PE_absptr; initial_insn_length = end - buf; - if (initial_insn_length <= 50) - { - cie.initial_insn_length = initial_insn_length; - memcpy (cie.initial_instructions, buf, initial_insn_length); - } + cie->initial_insn_length = initial_insn_length; + memcpy (cie->initial_instructions, buf, + initial_insn_length <= sizeof (cie->initial_instructions) + ? initial_insn_length : sizeof (cie->initial_instructions)); insns = buf; buf += initial_insn_length; ENSURE_NO_RELOCS (buf); - last_cie = last_fde; + + if (hdr_info->merge_cies) + this_inf->u.cie.u.full_cie = cie; + this_inf->u.cie.per_encoding_relative + = (cie->per_encoding & 0x70) == DW_EH_PE_pcrel; } else { - /* Ensure this FDE uses the last CIE encountered. */ - REQUIRE (last_cie); - REQUIRE (hdr.id == (unsigned int) (buf - 4 - last_cie)); + /* Find the corresponding CIE. */ + unsigned int cie_offset = this_inf->offset + 4 - hdr_id; + for (cie = local_cies; cie < local_cies + cie_count; cie++) + if (cie_offset == cie->cie_inf->offset) + break; - ENSURE_NO_RELOCS (buf); - REQUIRE (GET_RELOC (buf)); + /* Ensure this FDE references one of the CIEs in this input + section. */ + REQUIRE (cie != local_cies + cie_count); + this_inf->u.fde.cie_inf = cie->cie_inf; + this_inf->make_relative = cie->cie_inf->make_relative; + this_inf->add_augmentation_size + = cie->cie_inf->add_augmentation_size; - if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie)) - /* This is a FDE against a discarded section. It should - be deleted. */ - this_inf->removed = 1; - else + ENSURE_NO_RELOCS (buf); + if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL) { - if (info->shared - && (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr - && cie.make_relative == 0) - || (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned)) + asection *rsec; + + REQUIRE (GET_RELOC (buf)); + + /* Chain together the FDEs for each section. */ + rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie); + /* RSEC will be NULL if FDE was cleared out as it was belonging to + a discarded SHT_GROUP. */ + if (rsec) { - /* If a shared library uses absolute pointers - which we cannot turn into PC relative, - don't create the binary search table, - since it is affected by runtime relocations. */ - hdr_info->table = FALSE; + REQUIRE (rsec->owner == abfd); + this_inf->u.fde.next_for_section = elf_fde_list (rsec); + elf_fde_list (rsec) = this_inf; } - cie_usage_count++; - hdr_info->fde_count++; } + /* Skip the initial location and address range. */ start = buf; - length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); + length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); REQUIRE (skip_bytes (&buf, end, 2 * length)); /* Skip the augmentation size, if present. */ - if (cie.augmentation[0] == 'z') + if (cie->augmentation[0] == 'z') REQUIRE (read_uleb128 (&buf, end, &length)); else length = 0; @@ -757,12 +828,15 @@ _bfd_elf_discard_section_eh_frame /* Of the supported augmentation characters above, only 'L' adds augmentation data to the FDE. This code would need to be adjusted if any future augmentations do the same thing. */ - if (cie.lsda_encoding != DW_EH_PE_omit) + if (cie->lsda_encoding != DW_EH_PE_omit) { + SKIP_RELOCS (buf); + if (cie->can_make_lsda_relative && GET_RELOC (buf)) + cie->cie_inf->u.cie.make_lsda_relative = 1; this_inf->lsda_offset = buf - start; /* If there's no 'z' augmentation, we don't know where the CFA insns begin. Assume no padding. */ - if (cie.augmentation[0] != 'z') + if (cie->augmentation[0] != 'z') length = end - buf; } @@ -770,60 +844,378 @@ _bfd_elf_discard_section_eh_frame REQUIRE (skip_bytes (&buf, end, length)); insns = buf; - buf = last_fde + 4 + hdr.length; + buf = last_fde + 4 + hdr_length; + + /* For NULL RSEC (cleared FDE belonging to a discarded section) + the relocations are commonly cleared. We do not sanity check if + all these relocations are cleared as (1) relocations to + .gcc_except_table will remain uncleared (they will get dropped + with the drop of this unused FDE) and (2) BFD already safely drops + relocations of any type to .eh_frame by + elf_section_ignore_discarded_relocs. + TODO: The .gcc_except_table entries should be also filtered as + .eh_frame entries; or GCC could rather use COMDAT for them. */ SKIP_RELOCS (buf); } /* Try to interpret the CFA instructions and find the first padding nop. Shrink this_inf's size so that it doesn't - including the padding. */ - length = get_DW_EH_PE_width (cie.fde_encoding, ptr_size); - insns = skip_non_nops (insns, end, length); - if (insns != 0) - this_inf->size -= end - insns; - - this_inf->fde_encoding = cie.fde_encoding; - this_inf->lsda_encoding = cie.lsda_encoding; + include the padding. */ + length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); + set_loc_count = 0; + insns_end = skip_non_nops (insns, end, length, &set_loc_count); + /* If we don't understand the CFA instructions, we can't know + what needs to be adjusted there. */ + if (insns_end == NULL + /* For the time being we don't support DW_CFA_set_loc in + CIE instructions. */ + || (set_loc_count && this_inf->cie)) + goto free_no_table; + this_inf->size -= end - insns_end; + if (insns_end != end && this_inf->cie) + { + cie->initial_insn_length -= end - insns_end; + cie->length -= end - insns_end; + } + if (set_loc_count + && ((cie->fde_encoding & 0x70) == DW_EH_PE_pcrel + || this_inf->make_relative)) + { + unsigned int cnt; + bfd_byte *p; + + this_inf->set_loc = (unsigned int *) + bfd_malloc ((set_loc_count + 1) * sizeof (unsigned int)); + REQUIRE (this_inf->set_loc); + this_inf->set_loc[0] = set_loc_count; + p = insns; + cnt = 0; + while (p < end) + { + if (*p == DW_CFA_set_loc) + this_inf->set_loc[++cnt] = p + 1 - start; + REQUIRE (skip_cfa_op (&p, end, length)); + } + } + + this_inf->removed = 1; + this_inf->fde_encoding = cie->fde_encoding; + this_inf->lsda_encoding = cie->lsda_encoding; sec_info->count++; } + BFD_ASSERT (sec_info->count == num_entries); + BFD_ASSERT (cie_count == num_cies); elf_section_data (sec)->sec_info = sec_info; - sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME; + sec->sec_info_type = SEC_INFO_TYPE_EH_FRAME; + if (hdr_info->merge_cies) + { + sec_info->cies = local_cies; + local_cies = NULL; + } + goto success; + + free_no_table: + (*info->callbacks->einfo) + (_("%P: error in %B(%A); no .eh_frame_hdr table will be created.\n"), + abfd, sec); + hdr_info->table = FALSE; + if (sec_info) + free (sec_info); + success: + if (ehbuf) + free (ehbuf); + if (local_cies) + free (local_cies); +#undef REQUIRE +} + +/* Finish a pass over all .eh_frame sections. */ + +void +_bfd_elf_end_eh_frame_parsing (struct bfd_link_info *info) +{ + struct eh_frame_hdr_info *hdr_info; + + hdr_info = &elf_hash_table (info)->eh_info; + hdr_info->parsed_eh_frames = TRUE; +} + +/* Mark all relocations against CIE or FDE ENT, which occurs in + .eh_frame section SEC. COOKIE describes the relocations in SEC; + its "rel" field can be changed freely. */ + +static bfd_boolean +mark_entry (struct bfd_link_info *info, asection *sec, + struct eh_cie_fde *ent, elf_gc_mark_hook_fn gc_mark_hook, + struct elf_reloc_cookie *cookie) +{ + /* FIXME: octets_per_byte. */ + for (cookie->rel = cookie->rels + ent->reloc_index; + cookie->rel < cookie->relend + && cookie->rel->r_offset < ent->offset + ent->size; + cookie->rel++) + if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, cookie)) + return FALSE; + + return TRUE; +} + +/* Mark all the relocations against FDEs that relate to code in input + section SEC. The FDEs belong to .eh_frame section EH_FRAME, whose + relocations are described by COOKIE. */ + +bfd_boolean +_bfd_elf_gc_mark_fdes (struct bfd_link_info *info, asection *sec, + asection *eh_frame, elf_gc_mark_hook_fn gc_mark_hook, + struct elf_reloc_cookie *cookie) +{ + struct eh_cie_fde *fde, *cie; + + for (fde = elf_fde_list (sec); fde; fde = fde->u.fde.next_for_section) + { + if (!mark_entry (info, eh_frame, fde, gc_mark_hook, cookie)) + return FALSE; + + /* At this stage, all cie_inf fields point to local CIEs, so we + can use the same cookie to refer to them. */ + cie = fde->u.fde.cie_inf; + if (!cie->u.cie.gc_mark) + { + cie->u.cie.gc_mark = 1; + if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) + return FALSE; + } + } + return TRUE; +} + +/* Input section SEC of ABFD is an .eh_frame section that contains the + CIE described by CIE_INF. Return a version of CIE_INF that is going + to be kept in the output, adding CIE_INF to the output if necessary. + + HDR_INFO is the .eh_frame_hdr information and COOKIE describes the + relocations in REL. */ + +static struct eh_cie_fde * +find_merged_cie (bfd *abfd, struct bfd_link_info *info, asection *sec, + struct eh_frame_hdr_info *hdr_info, + struct elf_reloc_cookie *cookie, + struct eh_cie_fde *cie_inf) +{ + unsigned long r_symndx; + struct cie *cie, *new_cie; + Elf_Internal_Rela *rel; + void **loc; + + /* Use CIE_INF if we have already decided to keep it. */ + if (!cie_inf->removed) + return cie_inf; + + /* If we have merged CIE_INF with another CIE, use that CIE instead. */ + if (cie_inf->u.cie.merged) + return cie_inf->u.cie.u.merged_with; + + cie = cie_inf->u.cie.u.full_cie; + + /* Assume we will need to keep CIE_INF. */ + cie_inf->removed = 0; + cie_inf->u.cie.u.sec = sec; + + /* If we are not merging CIEs, use CIE_INF. */ + if (cie == NULL) + return cie_inf; + + if (cie->per_encoding != DW_EH_PE_omit) + { + bfd_boolean per_binds_local; + + /* Work out the address of personality routine, either as an absolute + value or as a symbol. */ + rel = cookie->rels + cie->personality.reloc_index; + memset (&cie->personality, 0, sizeof (cie->personality)); +#ifdef BFD64 + if (elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) + r_symndx = ELF64_R_SYM (rel->r_info); + else +#endif + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= cookie->locsymcount + || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL) + { + struct elf_link_hash_entry *h; + + r_symndx -= cookie->extsymoff; + h = cookie->sym_hashes[r_symndx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + cie->personality.h = h; + per_binds_local = SYMBOL_REFERENCES_LOCAL (info, h); + } + else + { + Elf_Internal_Sym *sym; + asection *sym_sec; + + sym = &cookie->locsyms[r_symndx]; + sym_sec = bfd_section_from_elf_index (abfd, sym->st_shndx); + if (sym_sec == NULL) + return cie_inf; + + if (sym_sec->kept_section != NULL) + sym_sec = sym_sec->kept_section; + if (sym_sec->output_section == NULL) + return cie_inf; + + cie->local_personality = 1; + cie->personality.val = (sym->st_value + + sym_sec->output_offset + + sym_sec->output_section->vma); + per_binds_local = TRUE; + } + + if (per_binds_local + && info->shared + && (cie->per_encoding & 0x70) == DW_EH_PE_absptr + && (get_elf_backend_data (abfd) + ->elf_backend_can_make_relative_eh_frame (abfd, info, sec))) + { + cie_inf->u.cie.make_per_encoding_relative = 1; + cie_inf->u.cie.per_encoding_relative = 1; + } + } + + /* See if we can merge this CIE with an earlier one. */ + cie->output_sec = sec->output_section; + cie_compute_hash (cie); + if (hdr_info->cies == NULL) + { + hdr_info->cies = htab_try_create (1, cie_hash, cie_eq, free); + if (hdr_info->cies == NULL) + return cie_inf; + } + loc = htab_find_slot_with_hash (hdr_info->cies, cie, cie->hash, INSERT); + if (loc == NULL) + return cie_inf; + + new_cie = (struct cie *) *loc; + if (new_cie == NULL) + { + /* Keep CIE_INF and record it in the hash table. */ + new_cie = (struct cie *) malloc (sizeof (struct cie)); + if (new_cie == NULL) + return cie_inf; + + memcpy (new_cie, cie, sizeof (struct cie)); + *loc = new_cie; + } + else + { + /* Merge CIE_INF with NEW_CIE->CIE_INF. */ + cie_inf->removed = 1; + cie_inf->u.cie.merged = 1; + cie_inf->u.cie.u.merged_with = new_cie->cie_inf; + if (cie_inf->u.cie.make_lsda_relative) + new_cie->cie_inf->u.cie.make_lsda_relative = 1; + } + return new_cie->cie_inf; +} + +/* This function is called for each input file before the .eh_frame + section is relocated. It discards duplicate CIEs and FDEs for discarded + functions. The function returns TRUE iff any entries have been + deleted. */ + +bfd_boolean +_bfd_elf_discard_section_eh_frame + (bfd *abfd, struct bfd_link_info *info, asection *sec, + bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), + struct elf_reloc_cookie *cookie) +{ + struct eh_cie_fde *ent; + struct eh_frame_sec_info *sec_info; + struct eh_frame_hdr_info *hdr_info; + unsigned int ptr_size, offset; + + if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) + return FALSE; + + sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; + if (sec_info == NULL) + return FALSE; + + ptr_size = (get_elf_backend_data (sec->owner) + ->elf_backend_eh_frame_address_size (sec->owner, sec)); + + hdr_info = &elf_hash_table (info)->eh_info; + for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) + if (ent->size == 4) + /* There should only be one zero terminator, on the last input + file supplying .eh_frame (crtend.o). Remove any others. */ + ent->removed = sec->map_head.s != NULL; + else if (!ent->cie) + { + bfd_boolean keep; + if ((sec->flags & SEC_LINKER_CREATED) != 0 && cookie->rels == NULL) + { + unsigned int width + = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); + bfd_vma value + = read_value (abfd, sec->contents + ent->offset + 8 + width, + width, get_DW_EH_PE_signed (ent->fde_encoding)); + keep = value != 0; + } + else + { + cookie->rel = cookie->rels + ent->reloc_index; + /* FIXME: octets_per_byte. */ + BFD_ASSERT (cookie->rel < cookie->relend + && cookie->rel->r_offset == ent->offset + 8); + keep = !(*reloc_symbol_deleted_p) (ent->offset + 8, cookie); + } + if (keep) + { + if (info->shared + && (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr + && ent->make_relative == 0) + || (ent->fde_encoding & 0x70) == DW_EH_PE_aligned)) + { + /* If a shared library uses absolute pointers + which we cannot turn into PC relative, + don't create the binary search table, + since it is affected by runtime relocations. */ + hdr_info->table = FALSE; + (*info->callbacks->einfo) + (_("%P: fde encoding in %B(%A) prevents .eh_frame_hdr" + " table being created.\n"), abfd, sec); + } + ent->removed = 0; + hdr_info->fde_count++; + ent->u.fde.cie_inf = find_merged_cie (abfd, info, sec, hdr_info, + cookie, ent->u.fde.cie_inf); + } + } + + if (sec_info->cies) + { + free (sec_info->cies); + sec_info->cies = NULL; + } - /* Ok, now we can assign new offsets. */ offset = 0; - last_cie_inf = hdr_info->last_cie_inf; for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) if (!ent->removed) { - if (ent->cie) - last_cie_inf = ent; - else - ent->cie_inf = last_cie_inf; ent->new_offset = offset; offset += size_of_output_cie_fde (ent, ptr_size); } - hdr_info->last_cie_inf = last_cie_inf; - /* Resize the sec as needed. */ sec->rawsize = sec->size; sec->size = offset; - if (sec->size == 0) - sec->flags |= SEC_EXCLUDE; - - free (ehbuf); return offset != sec->rawsize; - -free_no_table: - if (ehbuf) - free (ehbuf); - if (sec_info) - free (sec_info); - hdr_info->table = FALSE; - hdr_info->last_cie.hdr.length = 0; - return FALSE; - -#undef REQUIRE } /* This function is called for .eh_frame_hdr section after @@ -839,6 +1231,13 @@ _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) htab = elf_hash_table (info); hdr_info = &htab->eh_info; + + if (hdr_info->cies != NULL) + { + htab_delete (hdr_info->cies); + hdr_info->cies = NULL; + } + sec = hdr_info->hdr_sec; if (sec == NULL) return FALSE; @@ -847,12 +1246,30 @@ _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) if (hdr_info->table) sec->size += 4 + hdr_info->fde_count * 8; - /* Request program headers to be recalculated. */ - elf_tdata (abfd)->program_header_size = 0; - elf_tdata (abfd)->eh_frame_hdr = sec; + elf_eh_frame_hdr (abfd) = sec; return TRUE; } +/* Return true if there is at least one non-empty .eh_frame section in + input files. Can only be called after ld has mapped input to + output sections, and before sections are stripped. */ +bfd_boolean +_bfd_elf_eh_frame_present (struct bfd_link_info *info) +{ + asection *eh = bfd_get_section_by_name (info->output_bfd, ".eh_frame"); + + if (eh == NULL) + return FALSE; + + /* Count only sections which have at least a single CIE or FDE. + There cannot be any CIE or FDE <= 8 bytes. */ + for (eh = eh->map_head.s; eh != NULL; eh = eh->map_head.s) + if (eh->size > 8) + return TRUE; + + return FALSE; +} + /* This function is called from size_dynamic_sections. It needs to decide whether .eh_frame_hdr should be output or not, because when the dynamic symbol table has been sized it is too late @@ -861,8 +1278,6 @@ _bfd_elf_discard_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) { - asection *o; - bfd *abfd; struct elf_link_hash_table *htab; struct eh_frame_hdr_info *hdr_info; @@ -871,24 +1286,9 @@ _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) if (hdr_info->hdr_sec == NULL) return TRUE; - if (bfd_is_abs_section (hdr_info->hdr_sec->output_section)) - { - hdr_info->hdr_sec = NULL; - return TRUE; - } - - abfd = NULL; - if (info->eh_frame_hdr) - for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) - { - /* Count only sections which have at least a single CIE or FDE. - There cannot be any CIE or FDE <= 8 bytes. */ - o = bfd_get_section_by_name (abfd, ".eh_frame"); - if (o && o->size > 8 && !bfd_is_abs_section (o->output_section)) - break; - } - - if (abfd == NULL) + if (bfd_is_abs_section (hdr_info->hdr_sec->output_section) + || !info->eh_frame_hdr + || !_bfd_elf_eh_frame_present (info)) { hdr_info->hdr_sec->flags |= SEC_EXCLUDE; hdr_info->hdr_sec = NULL; @@ -906,27 +1306,20 @@ _bfd_elf_maybe_strip_eh_frame_hdr (struct bfd_link_info *info) bfd_vma _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, - struct bfd_link_info *info, + struct bfd_link_info *info ATTRIBUTE_UNUSED, asection *sec, bfd_vma offset) { struct eh_frame_sec_info *sec_info; - struct elf_link_hash_table *htab; - struct eh_frame_hdr_info *hdr_info; unsigned int lo, hi, mid; - if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) + if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) return offset; - sec_info = elf_section_data (sec)->sec_info; + sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; if (offset >= sec->rawsize) return offset - sec->rawsize + sec->size; - htab = elf_hash_table (info); - hdr_info = &htab->eh_info; - if (hdr_info->offsets_adjusted) - offset += sec->output_offset; - lo = 0; hi = sec_info->count; mid = 0; @@ -948,28 +1341,44 @@ _bfd_elf_eh_frame_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, if (sec_info->entry[mid].removed) return (bfd_vma) -1; + /* If converting personality pointers to DW_EH_PE_pcrel, there will be + no need for run-time relocation against the personality field. */ + if (sec_info->entry[mid].cie + && sec_info->entry[mid].u.cie.make_per_encoding_relative + && offset == (sec_info->entry[mid].offset + 8 + + sec_info->entry[mid].u.cie.personality_offset)) + return (bfd_vma) -2; + /* If converting to DW_EH_PE_pcrel, there will be no need for run-time relocation against FDE's initial_location field. */ if (!sec_info->entry[mid].cie - && sec_info->entry[mid].cie_inf->make_relative + && sec_info->entry[mid].make_relative && offset == sec_info->entry[mid].offset + 8) return (bfd_vma) -2; /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need for run-time relocation against LSDA field. */ if (!sec_info->entry[mid].cie - && sec_info->entry[mid].cie_inf->make_lsda_relative - && (offset == (sec_info->entry[mid].offset + 8 - + sec_info->entry[mid].lsda_offset)) - && (sec_info->entry[mid].cie_inf->need_lsda_relative - || !hdr_info->offsets_adjusted)) + && sec_info->entry[mid].u.fde.cie_inf->u.cie.make_lsda_relative + && offset == (sec_info->entry[mid].offset + 8 + + sec_info->entry[mid].lsda_offset)) + return (bfd_vma) -2; + + /* If converting to DW_EH_PE_pcrel, there will be no need for run-time + relocation against DW_CFA_set_loc's arguments. */ + if (sec_info->entry[mid].set_loc + && sec_info->entry[mid].make_relative + && (offset >= sec_info->entry[mid].offset + 8 + + sec_info->entry[mid].set_loc[1])) { - sec_info->entry[mid].cie_inf->need_lsda_relative = 1; - return (bfd_vma) -2; + unsigned int cnt; + + for (cnt = 1; cnt <= sec_info->entry[mid].set_loc[0]; cnt++) + if (offset == sec_info->entry[mid].offset + 8 + + sec_info->entry[mid].set_loc[cnt]) + return (bfd_vma) -2; } - if (hdr_info->offsets_adjusted) - offset -= sec->output_offset; /* Any new augmentation bytes go before the first relocation. */ return (offset + sec_info->entry[mid].new_offset - sec_info->entry[mid].offset @@ -992,7 +1401,8 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, unsigned int ptr_size; struct eh_cie_fde *ent; - if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME) + if (sec->sec_info_type != SEC_INFO_TYPE_EH_FRAME) + /* FIXME: octets_per_byte. */ return bfd_set_section_contents (abfd, sec->output_section, contents, sec->output_offset, sec->size); @@ -1000,45 +1410,13 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, ->elf_backend_eh_frame_address_size (abfd, sec)); BFD_ASSERT (ptr_size != 0); - sec_info = elf_section_data (sec)->sec_info; + sec_info = (struct eh_frame_sec_info *) elf_section_data (sec)->sec_info; htab = elf_hash_table (info); hdr_info = &htab->eh_info; - /* First convert all offsets to output section offsets, so that a - CIE offset is valid if the CIE is used by a FDE from some other - section. This can happen when duplicate CIEs are deleted in - _bfd_elf_discard_section_eh_frame. We do all sections here because - this function might not be called on sections in the same order as - _bfd_elf_discard_section_eh_frame. */ - if (!hdr_info->offsets_adjusted) - { - bfd *ibfd; - asection *eh; - struct eh_frame_sec_info *eh_inf; - - for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) - { - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || (ibfd->flags & DYNAMIC) != 0) - continue; - - eh = bfd_get_section_by_name (ibfd, ".eh_frame"); - if (eh == NULL || eh->sec_info_type != ELF_INFO_TYPE_EH_FRAME) - continue; - - eh_inf = elf_section_data (eh)->sec_info; - for (ent = eh_inf->entry; ent < eh_inf->entry + eh_inf->count; ++ent) - { - ent->offset += eh->output_offset; - ent->new_offset += eh->output_offset; - } - } - hdr_info->offsets_adjusted = TRUE; - } - if (hdr_info->table && hdr_info->array == NULL) - hdr_info->array - = bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array)); + hdr_info->array = (struct eh_frame_array_ent *) + bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array)); if (hdr_info->array == NULL) hdr_info = NULL; @@ -1049,13 +1427,11 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, not reordered */ for (ent = sec_info->entry + sec_info->count; ent-- != sec_info->entry;) if (!ent->removed && ent->new_offset > ent->offset) - memmove (contents + ent->new_offset - sec->output_offset, - contents + ent->offset - sec->output_offset, ent->size); + memmove (contents + ent->new_offset, contents + ent->offset, ent->size); for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) if (!ent->removed && ent->new_offset < ent->offset) - memmove (contents + ent->new_offset - sec->output_offset, - contents + ent->offset - sec->output_offset, ent->size); + memmove (contents + ent->new_offset, contents + ent->offset, ent->size); for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent) { @@ -1072,23 +1448,23 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, continue; } - buf = contents + ent->new_offset - sec->output_offset; + buf = contents + ent->new_offset; end = buf + ent->size; new_size = size_of_output_cie_fde (ent, ptr_size); - /* Install the new size, filling the extra bytes with DW_CFA_nops. */ + /* Update the size. It may be shrinked. */ + bfd_put_32 (abfd, new_size - 4, buf); + + /* Filling the extra bytes with DW_CFA_nops. */ if (new_size != ent->size) - { - memset (end, 0, new_size - ent->size); - bfd_put_32 (abfd, new_size - 4, buf); - } + memset (end, 0, new_size - ent->size); if (ent->cie) { /* CIE */ if (ent->make_relative - || ent->need_lsda_relative - || ent->per_encoding_relative) + || ent->u.cie.make_lsda_relative + || ent->u.cie.per_encoding_relative) { char *aug; unsigned int action, extra_string, extra_data; @@ -1097,8 +1473,8 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, /* Need to find 'R' or 'L' augmentation's argument and modify DW_EH_PE_* value. */ action = ((ent->make_relative ? 1 : 0) - | (ent->need_lsda_relative ? 2 : 0) - | (ent->per_encoding_relative ? 4 : 0)); + | (ent->u.cie.make_lsda_relative ? 2 : 0) + | (ent->u.cie.per_encoding_relative ? 4 : 0)); extra_string = extra_augmentation_string_bytes (ent); extra_data = extra_augmentation_data_bytes (ent); @@ -1128,11 +1504,11 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, *aug++ = 'z'; *buf++ = extra_data - 1; } - if (ent->add_fde_encoding) + if (ent->u.cie.add_fde_encoding) { BFD_ASSERT (action & 1); *aug++ = 'R'; - *buf++ = DW_EH_PE_pcrel; + *buf++ = make_pc_relative (DW_EH_PE_absptr, ptr_size); action &= ~1; } @@ -1143,18 +1519,20 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, if (action & 2) { BFD_ASSERT (*buf == ent->lsda_encoding); - *buf |= DW_EH_PE_pcrel; + *buf = make_pc_relative (*buf, ptr_size); action &= ~2; } buf++; break; case 'P': + if (ent->u.cie.make_per_encoding_relative) + *buf = make_pc_relative (*buf, ptr_size); per_encoding = *buf++; per_width = get_DW_EH_PE_width (per_encoding, ptr_size); BFD_ASSERT (per_width != 0); BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel) - == ent->per_encoding_relative); - if ((per_encoding & 0xf0) == DW_EH_PE_aligned) + == ent->u.cie.per_encoding_relative); + if ((per_encoding & 0x70) == DW_EH_PE_aligned) buf = (contents + ((buf - contents + per_width - 1) & ~((bfd_size_type) per_width - 1))); @@ -1164,8 +1542,15 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, val = read_value (abfd, buf, per_width, get_DW_EH_PE_signed (per_encoding)); - val += ent->offset - ent->new_offset; - val -= extra_string + extra_data; + if (ent->u.cie.make_per_encoding_relative) + val -= (sec->output_section->vma + + sec->output_offset + + (buf - contents)); + else + { + val += (bfd_vma) ent->offset - ent->new_offset; + val -= extra_string + extra_data; + } write_value (abfd, buf, val, per_width); action &= ~4; } @@ -1175,7 +1560,7 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, if (action & 1) { BFD_ASSERT (*buf == ent->fde_encoding); - *buf |= DW_EH_PE_pcrel; + *buf = make_pc_relative (*buf, ptr_size); action &= ~1; } buf++; @@ -1192,10 +1577,14 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, /* FDE */ bfd_vma value, address; unsigned int width; + bfd_byte *start; + struct eh_cie_fde *cie; /* Skip length. */ + cie = ent->u.fde.cie_inf; buf += 4; - value = ent->new_offset + 4 - ent->cie_inf->new_offset; + value = ((ent->new_offset + sec->output_offset + 4) + - (cie->new_offset + cie->u.cie.u.sec->output_offset)); bfd_put_32 (abfd, value, buf); buf += 4; width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); @@ -1204,39 +1593,72 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, address = value; if (value) { - switch (ent->fde_encoding & 0xf0) + switch (ent->fde_encoding & 0x70) { - case DW_EH_PE_indirect: case DW_EH_PE_textrel: BFD_ASSERT (hdr_info == NULL); break; case DW_EH_PE_datarel: { - asection *got = bfd_get_section_by_name (abfd, ".got"); - - BFD_ASSERT (got != NULL); - address += got->vma; + switch (abfd->arch_info->arch) + { + case bfd_arch_ia64: + BFD_ASSERT (elf_gp (abfd) != 0); + address += elf_gp (abfd); + break; + default: + (*info->callbacks->einfo) + (_("%P: DW_EH_PE_datarel unspecified" + " for this architecture.\n")); + /* Fall thru */ + case bfd_arch_frv: + case bfd_arch_i386: + BFD_ASSERT (htab->hgot != NULL + && ((htab->hgot->root.type + == bfd_link_hash_defined) + || (htab->hgot->root.type + == bfd_link_hash_defweak))); + address + += (htab->hgot->root.u.def.value + + htab->hgot->root.u.def.section->output_offset + + (htab->hgot->root.u.def.section->output_section + ->vma)); + break; + } } break; case DW_EH_PE_pcrel: - value += ent->offset - ent->new_offset; - address += sec->output_section->vma + ent->offset + 8; + value += (bfd_vma) ent->offset - ent->new_offset; + address += (sec->output_section->vma + + sec->output_offset + + ent->offset + 8); break; } - if (ent->cie_inf->make_relative) - value -= sec->output_section->vma + ent->new_offset + 8; + if (ent->make_relative) + value -= (sec->output_section->vma + + sec->output_offset + + ent->new_offset + 8); write_value (abfd, buf, value, width); } + start = buf; + if (hdr_info) { + /* The address calculation may overflow, giving us a + value greater than 4G on a 32-bit target when + dwarf_vma is 64-bit. */ + if (sizeof (address) > 4 && ptr_size == 4) + address &= 0xffffffff; hdr_info->array[hdr_info->array_count].initial_loc = address; hdr_info->array[hdr_info->array_count++].fde - = sec->output_section->vma + ent->new_offset; + = (sec->output_section->vma + + sec->output_offset + + ent->new_offset); } - if ((ent->lsda_encoding & 0xf0) == DW_EH_PE_pcrel - || ent->cie_inf->need_lsda_relative) + if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel + || cie->u.cie.make_lsda_relative) { buf += ent->lsda_offset; width = get_DW_EH_PE_width (ent->lsda_encoding, ptr_size); @@ -1244,15 +1666,16 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, get_DW_EH_PE_signed (ent->lsda_encoding)); if (value) { - if ((ent->lsda_encoding & 0xf0) == DW_EH_PE_pcrel) - value += ent->offset - ent->new_offset; - else if (ent->cie_inf->need_lsda_relative) - value -= (sec->output_section->vma + ent->new_offset + 8 - + ent->lsda_offset); + if ((ent->lsda_encoding & 0x70) == DW_EH_PE_pcrel) + value += (bfd_vma) ent->offset - ent->new_offset; + else if (cie->u.cie.make_lsda_relative) + value -= (sec->output_section->vma + + sec->output_offset + + ent->new_offset + 8 + ent->lsda_offset); write_value (abfd, buf, value, width); } } - else if (ent->cie_inf->add_augmentation_size) + else if (ent->add_augmentation_size) { /* Skip the PC and length and insert a zero byte for the augmentation size. */ @@ -1260,44 +1683,48 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, memmove (buf + 1, buf, end - buf); *buf = 0; } - } - } - - { - unsigned int alignment = 1 << sec->alignment_power; - unsigned int pad = sec->size % alignment; - - /* Don't pad beyond the raw size of the output section. It - can happen at the last input section. */ - if (pad - && ((sec->output_offset + sec->size + pad) - <= sec->output_section->size)) - { - bfd_byte *buf; - unsigned int new_size; - /* Find the last CIE/FDE. */ - ent = sec_info->entry + sec_info->count; - while (--ent != sec_info->entry) - if (!ent->removed) - break; - - /* The size of the last CIE/FDE must be at least 4. */ - if (ent->removed || ent->size < 4) - abort (); - - pad = alignment - pad; - buf = contents + ent->new_offset - sec->output_offset; - new_size = size_of_output_cie_fde (ent, ptr_size); + if (ent->set_loc) + { + /* Adjust DW_CFA_set_loc. */ + unsigned int cnt; + bfd_vma new_offset; - /* Pad it with DW_CFA_nop */ - memset (buf + new_size, 0, pad); - bfd_put_32 (abfd, new_size + pad - 4, buf); + width = get_DW_EH_PE_width (ent->fde_encoding, ptr_size); + new_offset = ent->new_offset + 8 + + extra_augmentation_string_bytes (ent) + + extra_augmentation_data_bytes (ent); - sec->size += pad; + for (cnt = 1; cnt <= ent->set_loc[0]; cnt++) + { + buf = start + ent->set_loc[cnt]; + + value = read_value (abfd, buf, width, + get_DW_EH_PE_signed (ent->fde_encoding)); + if (!value) + continue; + + if ((ent->fde_encoding & 0x70) == DW_EH_PE_pcrel) + value += (bfd_vma) ent->offset + 8 - new_offset; + if (ent->make_relative) + value -= (sec->output_section->vma + + sec->output_offset + + new_offset + ent->set_loc[cnt]); + write_value (abfd, buf, value, width); + } + } } } + /* We don't align the section to its section alignment since the + runtime library only expects all CIE/FDE records aligned at + the pointer size. _bfd_elf_discard_section_eh_frame should + have padded CIE/FDE records to multiple of pointer size with + size_of_output_cie_fde. */ + if ((sec->size % ptr_size) != 0) + abort (); + + /* FIXME: octets_per_byte. */ return bfd_set_section_contents (abfd, sec->output_section, contents, (file_ptr) sec->output_offset, sec->size); @@ -1309,8 +1736,8 @@ _bfd_elf_write_section_eh_frame (bfd *abfd, static int vma_compare (const void *a, const void *b) { - const struct eh_frame_array_ent *p = a; - const struct eh_frame_array_ent *q = b; + const struct eh_frame_array_ent *p = (const struct eh_frame_array_ent *) a; + const struct eh_frame_array_ent *q = (const struct eh_frame_array_ent *) b; if (p->initial_loc > q->initial_loc) return 1; if (p->initial_loc < q->initial_loc) @@ -1346,73 +1773,81 @@ _bfd_elf_write_section_eh_frame_hdr (bfd *abfd, struct bfd_link_info *info) struct elf_link_hash_table *htab; struct eh_frame_hdr_info *hdr_info; asection *sec; - bfd_byte *contents; - asection *eh_frame_sec; - bfd_size_type size; - bfd_boolean retval; - bfd_vma encoded_eh_frame; + bfd_boolean retval = TRUE; htab = elf_hash_table (info); hdr_info = &htab->eh_info; sec = hdr_info->hdr_sec; - if (sec == NULL) - return TRUE; - size = EH_FRAME_HDR_SIZE; - if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) - size += 4 + hdr_info->fde_count * 8; - contents = bfd_malloc (size); - if (contents == NULL) - return FALSE; - - eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); - if (eh_frame_sec == NULL) + if (info->eh_frame_hdr && sec != NULL) { - free (contents); - return FALSE; - } - - memset (contents, 0, EH_FRAME_HDR_SIZE); - contents[0] = 1; /* Version. */ - contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address - (abfd, info, eh_frame_sec, 0, sec, 4, - &encoded_eh_frame); /* .eh_frame offset. */ + bfd_byte *contents; + asection *eh_frame_sec; + bfd_size_type size; + bfd_vma encoded_eh_frame; + + size = EH_FRAME_HDR_SIZE; + if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) + size += 4 + hdr_info->fde_count * 8; + contents = (bfd_byte *) bfd_malloc (size); + if (contents == NULL) + return FALSE; + + eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame"); + if (eh_frame_sec == NULL) + { + free (contents); + return FALSE; + } - if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) - { - contents[2] = DW_EH_PE_udata4; /* FDE count encoding. */ - contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; /* Search table enc. */ - } - else - { - contents[2] = DW_EH_PE_omit; - contents[3] = DW_EH_PE_omit; - } - bfd_put_32 (abfd, encoded_eh_frame, contents + 4); + memset (contents, 0, EH_FRAME_HDR_SIZE); + /* Version. */ + contents[0] = 1; + /* .eh_frame offset. */ + contents[1] = get_elf_backend_data (abfd)->elf_backend_encode_eh_address + (abfd, info, eh_frame_sec, 0, sec, 4, &encoded_eh_frame); - if (contents[2] != DW_EH_PE_omit) - { - unsigned int i; + if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count) + { + /* FDE count encoding. */ + contents[2] = DW_EH_PE_udata4; + /* Search table encoding. */ + contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; + } + else + { + contents[2] = DW_EH_PE_omit; + contents[3] = DW_EH_PE_omit; + } + bfd_put_32 (abfd, encoded_eh_frame, contents + 4); - bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE); - qsort (hdr_info->array, hdr_info->fde_count, sizeof (*hdr_info->array), - vma_compare); - for (i = 0; i < hdr_info->fde_count; i++) + if (contents[2] != DW_EH_PE_omit) { - bfd_put_32 (abfd, - hdr_info->array[i].initial_loc - - sec->output_section->vma, - contents + EH_FRAME_HDR_SIZE + i * 8 + 4); - bfd_put_32 (abfd, - hdr_info->array[i].fde - sec->output_section->vma, - contents + EH_FRAME_HDR_SIZE + i * 8 + 8); + unsigned int i; + + bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE); + qsort (hdr_info->array, hdr_info->fde_count, + sizeof (*hdr_info->array), vma_compare); + for (i = 0; i < hdr_info->fde_count; i++) + { + bfd_put_32 (abfd, + hdr_info->array[i].initial_loc + - sec->output_section->vma, + contents + EH_FRAME_HDR_SIZE + i * 8 + 4); + bfd_put_32 (abfd, + hdr_info->array[i].fde - sec->output_section->vma, + contents + EH_FRAME_HDR_SIZE + i * 8 + 8); + } } - } - retval = bfd_set_section_contents (abfd, sec->output_section, - contents, (file_ptr) sec->output_offset, - sec->size); - free (contents); + /* FIXME: octets_per_byte. */ + retval = bfd_set_section_contents (abfd, sec->output_section, contents, + (file_ptr) sec->output_offset, + sec->size); + free (contents); + } + if (hdr_info->array != NULL) + free (hdr_info->array); return retval; }