Delay setting up compressed debug section names
When we set up st_name for output section name in elf_fake_sections, we don't know if the compressed DWARF debug section will be smaller. We may end up with compressed DWARF debug sections which are bigger than the uncompressed ones. This patch delays setting up st_name for output DWARF debug section to _bfd_elf_assign_file_positions_for_non_load which will compress the output debug section. We also postpone placement of shstrtab section after DWARF debug sections have been compressed. The net effect is .shstrtab section is now placed after .symtab and .strtab sections. bfd/ PR ld/18277 * compress.c (bfd_compress_section_contents): Remove the write_compress argument. (bfd_init_section_compress_status): Updated. (bfd_compress_section): Likewise. * elf.c (_bfd_elf_set_reloc_sh_name): New. (_bfd_elf_init_reloc_shdr): Add delay_st_name_p. Set sh_name to (unsigned int) -1 if delay_st_name_p is TRUE. Use _bfd_elf_set_reloc_sh_name. (elf_fake_sections): Don't rename DWARF debug section for linker output if it will be compressed. Instead, set delay_st_name_p to TRUE and pass it to _bfd_elf_init_reloc_shdr. (assign_section_numbers): Call _bfd_elf_strtab_addref only if sh_name != (unsigned int) -1. Don't finalize nor assign shstrtab section here. Delay setting output section names to _bfd_elf_write_object_contents. (_bfd_elf_compute_section_file_positions): Update comments on sh_offset for shstrtab section. (assign_file_positions_for_non_load_sections): Set sh_offset to -1 for shstrtab section. (assign_file_positions_except_relocs): Likewise. (_bfd_elf_assign_file_positions_for_non_load): Set up sh_name when compressing DWARF debug sections. Place shstrtab section after DWARF debug sections have been compressed. (_bfd_elf_write_object_contents): Setting sh_name for output sections. ld/testsuite/ PR ld/18277 * ld-elf/compressed1d.d: New. * ld-elf/compressed1e.d: Likewise.
This commit is contained in:
H.J. Lu
parent
ece794d9c4
commit
3e19fb8f99
@ -1,3 +1,32 @@
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2015-04-23 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/18277
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* compress.c (bfd_compress_section_contents): Remove the
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write_compress argument.
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(bfd_init_section_compress_status): Updated.
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(bfd_compress_section): Likewise.
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* elf.c (_bfd_elf_set_reloc_sh_name): New.
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(_bfd_elf_init_reloc_shdr): Add delay_st_name_p. Set sh_name
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to (unsigned int) -1 if delay_st_name_p is TRUE. Use
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_bfd_elf_set_reloc_sh_name.
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(elf_fake_sections): Don't rename DWARF debug section for
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linker output if it will be compressed. Instead, set
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delay_st_name_p to TRUE and pass it to _bfd_elf_init_reloc_shdr.
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(assign_section_numbers): Call _bfd_elf_strtab_addref only if
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sh_name != (unsigned int) -1. Don't finalize nor assign
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shstrtab section here. Delay setting output section names to
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_bfd_elf_write_object_contents.
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(_bfd_elf_compute_section_file_positions): Update comments on
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sh_offset for shstrtab section.
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(assign_file_positions_for_non_load_sections): Set sh_offset to
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-1 for shstrtab section.
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(assign_file_positions_except_relocs): Likewise.
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(_bfd_elf_assign_file_positions_for_non_load): Set up sh_name
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when compressing DWARF debug sections. Place shstrtab section
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after DWARF debug sections have been compressed.
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(_bfd_elf_write_object_contents): Setting sh_name for output
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sections.
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2015-04-23 H.J. Lu <hongjiu.lu@intel.com>
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PR binutils/18209
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@ -72,8 +72,7 @@ decompress_contents (bfd_byte *compressed_buffer,
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static bfd_size_type
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bfd_compress_section_contents (bfd *abfd, sec_ptr sec,
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bfd_byte *uncompressed_buffer,
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bfd_size_type uncompressed_size,
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bfd_boolean write_compress)
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bfd_size_type uncompressed_size)
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{
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uLong compressed_size;
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bfd_byte *buffer;
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@ -177,11 +176,8 @@ bfd_compress_section_contents (bfd *abfd, sec_ptr sec,
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compressed_size += header_size;
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/* PR binutils/18087: If compression didn't make the section smaller,
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just keep it uncompressed. We always generate .zdebug_* section
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when linking since section names have been finalized and they
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can't be changed easily. */
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if ((write_compress && compression_header_size == 0)
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|| compressed_size < uncompressed_size)
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just keep it uncompressed. */
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if (compressed_size < uncompressed_size)
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{
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bfd_update_compression_header (abfd, buffer, sec);
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@ -547,8 +543,7 @@ bfd_init_section_compress_status (bfd *abfd, sec_ptr sec)
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{
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uncompressed_size = bfd_compress_section_contents (abfd, sec,
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uncompressed_buffer,
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uncompressed_size,
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FALSE);
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uncompressed_size);
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ret = uncompressed_size != 0;
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}
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@ -590,5 +585,5 @@ bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer)
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/* Compress it. */
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return bfd_compress_section_contents (abfd, sec, uncompressed_buffer,
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uncompressed_size, TRUE) != 0;
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uncompressed_size) != 0;
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}
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170
bfd/elf.c
170
bfd/elf.c
@ -2689,6 +2689,27 @@ _bfd_elf_single_rel_hdr (asection *sec)
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return elf_section_data (sec)->rela.hdr;
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}
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static bfd_boolean
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_bfd_elf_set_reloc_sh_name (bfd *abfd,
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Elf_Internal_Shdr *rel_hdr,
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const char *sec_name,
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bfd_boolean use_rela_p)
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{
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char *name = (char *) bfd_alloc (abfd,
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sizeof ".rela" + strlen (sec_name));
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if (name == NULL)
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return FALSE;
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sprintf (name, "%s%s", use_rela_p ? ".rela" : ".rel", sec_name);
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rel_hdr->sh_name =
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(unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd), name,
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FALSE);
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if (rel_hdr->sh_name == (unsigned int) -1)
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return FALSE;
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return TRUE;
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}
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/* Allocate and initialize a section-header for a new reloc section,
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containing relocations against ASECT. It is stored in RELDATA. If
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USE_RELA_P is TRUE, we use RELA relocations; otherwise, we use REL
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@ -2698,10 +2719,10 @@ static bfd_boolean
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_bfd_elf_init_reloc_shdr (bfd *abfd,
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struct bfd_elf_section_reloc_data *reldata,
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const char *sec_name,
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bfd_boolean use_rela_p)
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bfd_boolean use_rela_p,
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bfd_boolean delay_st_name_p)
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{
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Elf_Internal_Shdr *rel_hdr;
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char *name;
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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bfd_size_type amt;
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@ -2710,15 +2731,10 @@ _bfd_elf_init_reloc_shdr (bfd *abfd,
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rel_hdr = bfd_zalloc (abfd, amt);
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reldata->hdr = rel_hdr;
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amt = sizeof ".rela" + strlen (sec_name);
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name = (char *) bfd_alloc (abfd, amt);
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if (name == NULL)
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return FALSE;
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sprintf (name, "%s%s", use_rela_p ? ".rela" : ".rel", sec_name);
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rel_hdr->sh_name =
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(unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd), name,
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FALSE);
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if (rel_hdr->sh_name == (unsigned int) -1)
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if (delay_st_name_p)
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rel_hdr->sh_name = (unsigned int) -1;
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else if (!_bfd_elf_set_reloc_sh_name (abfd, rel_hdr, sec_name,
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use_rela_p))
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return FALSE;
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rel_hdr->sh_type = use_rela_p ? SHT_RELA : SHT_REL;
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rel_hdr->sh_entsize = (use_rela_p
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@ -2761,6 +2777,7 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
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Elf_Internal_Shdr *this_hdr;
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unsigned int sh_type;
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const char *name = asect->name;
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bfd_boolean delay_st_name_p = FALSE;
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if (arg->failed)
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{
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@ -2783,19 +2800,10 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
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compressed. */
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asect->flags |= SEC_ELF_COMPRESS;
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if (arg->link_info->compress_debug != COMPRESS_DEBUG_GABI_ZLIB)
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{
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/* If SHF_COMPRESSED isn't used, rename compressed DWARF
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debug section to .zdebug_*. */
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char *new_name = convert_debug_to_zdebug (abfd, name);
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if (new_name == NULL)
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{
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arg->failed = TRUE;
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return;
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}
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bfd_rename_section (abfd, asect, new_name);
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name = asect->name;
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}
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/* If this section will be compressed, delay adding setion
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name to section name section after it is compressed in
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_bfd_elf_assign_file_positions_for_non_load. */
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delay_st_name_p = TRUE;
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}
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}
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else if ((asect->flags & SEC_ELF_RENAME))
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@ -2834,12 +2842,18 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
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}
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}
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this_hdr->sh_name = (unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd),
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name, FALSE);
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if (this_hdr->sh_name == (unsigned int) -1)
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if (delay_st_name_p)
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this_hdr->sh_name = (unsigned int) -1;
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else
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{
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arg->failed = TRUE;
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return;
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this_hdr->sh_name
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= (unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd),
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name, FALSE);
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if (this_hdr->sh_name == (unsigned int) -1)
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{
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arg->failed = TRUE;
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return;
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}
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}
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/* Don't clear sh_flags. Assembler may set additional bits. */
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@ -3013,13 +3027,15 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
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&& (arg->link_info->relocatable || arg->link_info->emitrelocations))
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{
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if (esd->rel.count && esd->rel.hdr == NULL
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&& !_bfd_elf_init_reloc_shdr (abfd, &esd->rel, name, FALSE))
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&& !_bfd_elf_init_reloc_shdr (abfd, &esd->rel, name, FALSE,
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delay_st_name_p))
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{
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arg->failed = TRUE;
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return;
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}
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if (esd->rela.count && esd->rela.hdr == NULL
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&& !_bfd_elf_init_reloc_shdr (abfd, &esd->rela, name, TRUE))
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&& !_bfd_elf_init_reloc_shdr (abfd, &esd->rela, name, TRUE,
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delay_st_name_p))
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{
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arg->failed = TRUE;
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return;
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@ -3029,7 +3045,8 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
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(asect->use_rela_p
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? &esd->rela : &esd->rel),
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name,
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asect->use_rela_p))
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asect->use_rela_p,
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delay_st_name_p))
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arg->failed = TRUE;
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}
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@ -3214,7 +3231,7 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
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{
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struct elf_obj_tdata *t = elf_tdata (abfd);
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asection *sec;
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unsigned int section_number, secn;
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unsigned int section_number;
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Elf_Internal_Shdr **i_shdrp;
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struct bfd_elf_section_data *d;
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bfd_boolean need_symtab;
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@ -3251,11 +3268,13 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
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if (d->this_hdr.sh_type != SHT_GROUP)
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d->this_idx = section_number++;
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->this_hdr.sh_name);
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if (d->this_hdr.sh_name != (unsigned int) -1)
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->this_hdr.sh_name);
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if (d->rel.hdr)
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{
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d->rel.idx = section_number++;
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->rel.hdr->sh_name);
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if (d->rel.hdr->sh_name != (unsigned int) -1)
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->rel.hdr->sh_name);
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}
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else
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d->rel.idx = 0;
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@ -3263,7 +3282,8 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
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if (d->rela.hdr)
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{
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d->rela.idx = section_number++;
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->rela.hdr->sh_name);
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if (d->rela.hdr->sh_name != (unsigned int) -1)
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_bfd_elf_strtab_addref (elf_shstrtab (abfd), d->rela.hdr->sh_name);
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}
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else
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d->rela.idx = 0;
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@ -3301,9 +3321,6 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
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return FALSE;
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}
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_bfd_elf_strtab_finalize (elf_shstrtab (abfd));
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t->shstrtab_hdr.sh_size = _bfd_elf_strtab_size (elf_shstrtab (abfd));
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elf_numsections (abfd) = section_number;
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elf_elfheader (abfd)->e_shnum = section_number;
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@ -3519,9 +3536,10 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
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}
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}
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for (secn = 1; secn < section_number; ++secn)
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i_shdrp[secn]->sh_name = _bfd_elf_strtab_offset (elf_shstrtab (abfd),
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i_shdrp[secn]->sh_name);
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/* Delay setting sh_name to _bfd_elf_write_object_contents so that
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_bfd_elf_assign_file_positions_for_non_load can convert DWARF
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debug section name from .debug_* to .zdebug_* if needed. */
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return TRUE;
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}
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@ -3778,7 +3796,7 @@ _bfd_elf_compute_section_file_positions (bfd *abfd,
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shstrtab_hdr->sh_entsize = 0;
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shstrtab_hdr->sh_link = 0;
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shstrtab_hdr->sh_info = 0;
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/* sh_offset is set in assign_file_positions_except_relocs. */
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/* sh_offset is set in _bfd_elf_assign_file_positions_for_non_load. */
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shstrtab_hdr->sh_addralign = 1;
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if (!assign_file_positions_except_relocs (abfd, link_info))
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@ -5188,7 +5206,8 @@ assign_file_positions_for_non_load_sections (bfd *abfd,
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/* Compress DWARF debug sections. */
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|| hdr == i_shdrpp[elf_onesymtab (abfd)]
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|| hdr == i_shdrpp[elf_symtab_shndx (abfd)]
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|| hdr == i_shdrpp[elf_strtab_sec (abfd)])
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|| hdr == i_shdrpp[elf_strtab_sec (abfd)]
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|| hdr == i_shdrpp[elf_shstrtab_sec (abfd)])
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hdr->sh_offset = -1;
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else
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off = _bfd_elf_assign_file_position_for_section (hdr, off, TRUE);
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@ -5441,7 +5460,8 @@ assign_file_positions_except_relocs (bfd *abfd,
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/* Compress DWARF debug sections. */
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|| i == elf_onesymtab (abfd)
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|| i == elf_symtab_shndx (abfd)
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|| i == elf_strtab_sec (abfd))
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|| i == elf_strtab_sec (abfd)
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|| i == elf_shstrtab_sec (abfd))
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{
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hdr->sh_offset = -1;
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}
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@ -5597,6 +5617,7 @@ _bfd_elf_assign_file_positions_for_non_load (bfd *abfd)
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{
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file_ptr off;
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Elf_Internal_Shdr **shdrpp, **end_shdrpp;
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Elf_Internal_Shdr *shdrp;
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Elf_Internal_Ehdr *i_ehdrp;
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const struct elf_backend_data *bed;
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@ -5606,26 +5627,59 @@ _bfd_elf_assign_file_positions_for_non_load (bfd *abfd)
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end_shdrpp = shdrpp + elf_numsections (abfd);
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for (shdrpp++; shdrpp < end_shdrpp; shdrpp++)
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{
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Elf_Internal_Shdr *shdrp;
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shdrp = *shdrpp;
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if (shdrp->sh_offset == -1)
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{
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asection *sec = shdrp->bfd_section;
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bfd_boolean is_rel = (shdrp->sh_type == SHT_REL
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|| shdrp->sh_type == SHT_RELA);
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if (is_rel
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|| (shdrp->bfd_section != NULL
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&& (shdrp->bfd_section->flags & SEC_ELF_COMPRESS)))
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|| (sec != NULL && (sec->flags & SEC_ELF_COMPRESS)))
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{
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if (!is_rel)
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{
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const char *name = sec->name;
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struct bfd_elf_section_data *d;
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/* Compress DWARF debug sections. */
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if (!bfd_compress_section (abfd, shdrp->bfd_section,
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if (!bfd_compress_section (abfd, sec,
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shdrp->contents))
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return FALSE;
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if (sec->compress_status == COMPRESS_SECTION_DONE
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&& (abfd->flags & BFD_COMPRESS_GABI) == 0)
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{
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/* If section is compressed with zlib-gnu, convert
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section name from .debug_* to .zdebug_*. */
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char *new_name
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= convert_debug_to_zdebug (abfd, name);
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if (new_name == NULL)
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return FALSE;
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name = new_name;
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}
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/* Add setion name to section name section. */
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if (shdrp->sh_name != (unsigned int) -1)
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abort ();
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shdrp->sh_name
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= (unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd),
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name, FALSE);
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d = elf_section_data (sec);
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/* Add reloc setion name to section name section. */
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if (d->rel.hdr
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&& !_bfd_elf_set_reloc_sh_name (abfd,
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d->rel.hdr,
|
||||
name, FALSE))
|
||||
return FALSE;
|
||||
if (d->rela.hdr
|
||||
&& !_bfd_elf_set_reloc_sh_name (abfd,
|
||||
d->rela.hdr,
|
||||
name, FALSE))
|
||||
return FALSE;
|
||||
|
||||
/* Update section size and contents. */
|
||||
shdrp->sh_size = shdrp->bfd_section->size;
|
||||
shdrp->contents = shdrp->bfd_section->contents;
|
||||
shdrp->sh_size = sec->size;
|
||||
shdrp->contents = sec->contents;
|
||||
shdrp->bfd_section->contents = NULL;
|
||||
}
|
||||
off = _bfd_elf_assign_file_position_for_section (shdrp,
|
||||
@ -5635,7 +5689,14 @@ _bfd_elf_assign_file_positions_for_non_load (bfd *abfd)
|
||||
}
|
||||
}
|
||||
|
||||
/* Place the section headers. */
|
||||
/* Place section name section after DWARF debug sections have been
|
||||
compressed. */
|
||||
_bfd_elf_strtab_finalize (elf_shstrtab (abfd));
|
||||
shdrp = &elf_tdata (abfd)->shstrtab_hdr;
|
||||
shdrp->sh_size = _bfd_elf_strtab_size (elf_shstrtab (abfd));
|
||||
off = _bfd_elf_assign_file_position_for_section (shdrp, off, TRUE);
|
||||
|
||||
/* Place the section headers. */
|
||||
i_ehdrp = elf_elfheader (abfd);
|
||||
bed = get_elf_backend_data (abfd);
|
||||
off = align_file_position (off, 1 << bed->s->log_file_align);
|
||||
@ -5673,6 +5734,9 @@ _bfd_elf_write_object_contents (bfd *abfd)
|
||||
num_sec = elf_numsections (abfd);
|
||||
for (count = 1; count < num_sec; count++)
|
||||
{
|
||||
i_shdrp[count]->sh_name
|
||||
= _bfd_elf_strtab_offset (elf_shstrtab (abfd),
|
||||
i_shdrp[count]->sh_name);
|
||||
if (bed->elf_backend_section_processing)
|
||||
(*bed->elf_backend_section_processing) (abfd, i_shdrp[count]);
|
||||
if (i_shdrp[count]->contents)
|
||||
|
||||
@ -1,3 +1,9 @@
|
||||
2015-04-23 H.J. Lu <hongjiu.lu@intel.com>
|
||||
|
||||
PR ld/18277
|
||||
* ld-elf/compressed1d.d: New.
|
||||
* ld-elf/compressed1e.d: Likewise.
|
||||
|
||||
2015-04-23 Alan Modra <amodra@gmail.com>
|
||||
|
||||
* ld-powerpc/ambiguousv1b.d: Update for aligned .got.
|
||||
|
||||
9
ld/testsuite/ld-elf/compressed1d.d
Normal file
9
ld/testsuite/ld-elf/compressed1d.d
Normal file
@ -0,0 +1,9 @@
|
||||
#source: compress1.s
|
||||
#as: --compress-debug-sections=none
|
||||
#ld: -r --compress-debug-sections=zlib-gnu
|
||||
#readelf: -SW
|
||||
|
||||
#failif
|
||||
#...
|
||||
\[[ 0-9]+\] \.zdebug_aranges[ ]+(PROGBITS|MIPS_DWARF)[ 0-9a-z]+ .*
|
||||
#...
|
||||
9
ld/testsuite/ld-elf/compressed1e.d
Normal file
9
ld/testsuite/ld-elf/compressed1e.d
Normal file
@ -0,0 +1,9 @@
|
||||
#source: compress1.s
|
||||
#as: --compress-debug-sections=none
|
||||
#ld: -shared --compress-debug-sections=zlib-gnu
|
||||
#readelf: -SW
|
||||
|
||||
#failif
|
||||
#...
|
||||
\[[ 0-9]+\] \.zdebug_aranges[ ]+(PROGBITS|MIPS_DWARF)[ 0-9a-z]+ .*
|
||||
#...
|
||||
Loading…
x
Reference in New Issue
Block a user