diff options
Diffstat (limited to 'bfd/elf-eh-frame.c')
| -rw-r--r-- | bfd/elf-eh-frame.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c index 63b6ba4..460112c 100644 --- a/bfd/elf-eh-frame.c +++ b/bfd/elf-eh-frame.c @@ -475,6 +475,7 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, unsigned int ptr_size; unsigned int num_cies; unsigned int num_entries; + elf_gc_mark_hook_fn gc_mark_hook; htab = elf_hash_table (info); hdr_info = &htab->eh_info; @@ -577,6 +578,7 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, buf = ehbuf; ecie_count = 0; + gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; while ((bfd_size_type) (buf - ehbuf) != sec->size) { char *aug; @@ -821,6 +823,8 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, } else { + asection *rsec; + /* Find the corresponding CIE. */ unsigned int cie_offset = this_inf->offset + 4 - hdr_id; for (ecie = ecies; ecie < ecies + ecie_count; ++ecie) @@ -836,6 +840,12 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info, ENSURE_NO_RELOCS (buf); REQUIRE (GET_RELOC (buf)); + /* Chain together the FDEs for each section. */ + rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie); + REQUIRE (rsec && rsec->owner == abfd); + this_inf->u.fde.next_for_section = elf_fde_list (rsec); + elf_fde_list (rsec) = this_inf; + /* Skip the initial location and address range. */ start = buf; length = get_DW_EH_PE_width (cie->fde_encoding, ptr_size); @@ -976,6 +986,55 @@ _bfd_elf_end_eh_frame_parsing (struct bfd_link_info *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) +{ + 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, *merged; + + 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; + merged = cie->u.cie.merged; + if (!merged->u.cie.gc_mark) + { + merged->u.cie.gc_mark = 1; + if (!mark_entry (info, eh_frame, cie, gc_mark_hook, cookie)) + return FALSE; + } + } + return TRUE; +} + /* 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 |