In a later commit I'd like to add support to GDB for including the
NT_386_TLS note in the core files that GDB creates (using 'gcore'
command).
To achieve this we need some standard boilerplate code added to bfd.
The only part of this patch which I think needs consideration is the
name I selected for the pseudo section to hold the note contents when
a core file is loaded. I chose '.reg-i386-tls'. The '.reg' prefix is
the standard used by most other pseudo sections, and the '-i386-tls'
suffix seemed to match the note name, though I added the 'i' to
'i386', instead of just using '.reg-386-tls'. I thought 'i386' seemed
clearer.
There's no test included here, but when I merge the NT_386_TLS
creation to GDB it will depend on this and act as a test. I plan to
post that work to the GDB list once this patch is merged.
... and const. There's no reason to have the compiler copy anonymous
objects onto the stack. And there's also no reason to allow the arrays
to be modifiable.
For some reason the initial implementation (commit 0672748ac0) of
this macro didn't allow discarding of all relocs in a section, perhaps
because doing so would require a testsuite change. This patch allows
zero size relocation sections to result, and adjusts the testsuite.
i386, x86_64, ppc and ppc64 code that avoids a memmove is also changed
to allow zero size reloc sections, and arc fixed to actually adjust
the reloc section header.
Commit d7f343eaad testsuite change resulted in a regression for
s390x-linux. This extends the x86_64 fix to other targets.
PR ld/33156
* elf-bfd.h (RELOC_AGAINST_DISCARDED_SECTION): Remove .sframe
relocs too.
init_private_section_data is used by the linker and is a special case
of copy_private_section_data that copies a reduced set of section data
from input to output. Merge the two functions, adding a link_info
param to copy_private_section_data and remove init_private_section_data.
PR/32666 Incorrect .rela.sframe when using ld -r
Input SFrame sections are merged using _bfd_elf_merge_section_sframe (),
which clubs all SFrame FDEs together in one blob and all SFrame FREs in
another. This, of course, means the offset of an SFrame FDE in the output
section cannot be simply derived from the output_offset of the sections.
Fix this by providing _bfd_elf_sframe_section_offset () which returns
the new offset of the SFrame FDE in the merged SFrame section.
Unlike EH_Frame sections, which also use the _bfd_elf_section_offset (),
to update the r_offset, SFrame sections have distinct merging semantics.
In case of SFrame, the SFrame FDE will not simply sit at location
"sec->output_offset + offset of SFrame FDE in sec". Recall that information
layout in an SFrame section is as follows:
SFrame Header
SFrame FDE 1
SFrame FDE 2
...
SFrame FDEn
SFrame FREs (Frame Row Entries)
Note how the SFrame FDEs and SFrame FREs are clubber together in groups
of their own.
Next, also note how the elf_link_input_bfd () does a:
irela->r_offset += o->output_offset;
This, however, needs to be avoided for SFrame sections because the
placement of all FDEs is at the beginning of the section. So, rather than
conditionalizing this as follows:
if (o->sec_info_type != SEC_INFO_TYPE_SFRAME)
irela->r_offset += o->output_offset;
the implementation in _bfd_elf_sframe_section_offset () does a reverse
adjustment, so that the generic parts of the linking process in
elf_link_input_bfd () are not made to do SFrame specific adjustments.
Add a new enum to track the current state of the SFrame input section
during the linking process (SFRAME_SEC_DECODED, SFRAME_SEC_MERGED) for
each input SFrame section. This is then used to assert an assumption
that _bfd_elf_sframe_section_offset () is being used on an input SFrame
sections which have not been merged (via
_bfd_elf_merge_section_sframe ()) yet.
bfd/
* elf-bfd.h: New declaration.
* elf-sframe.c (_bfd_elf_sframe_section_offset): New definition.
* elf.c (_bfd_elf_section_offset): Adjust offset if SFrame
section.
ld/testsuite/
* ld-x86-64/x86-64.exp: New test.
* ld-x86-64/sframe-reloc-1.d: New test.
- Extract _bfd_elf_find_property and _bfd_elf_insert_property from the
function's body to improve the code readability.
- Export _bfd_elf_find_property's symbol as it will be used in a later
commit.
- add obj_build_attributes to struct elf_backend_data similarly sframe.
- new function _bfd_elf_write_section_build_attributes encapsulating the
writing of the build attributes section into a function.
Since
commit 97da0e2677
Author: Alan Modra <amodra@gmail.com>
Date: Wed Jan 12 23:42:23 2022 +1030
tweak __ehdr_start visibility and flags for check_relocs
creates __ehdr_start hash in lang_symbol_tweaks, store __ehdr_start hash
in elf_link_hash_table so that we just need to lookup it up only once.
bfd/
* elf-bfd.h (elf_link_hash_table): Add hehdr_start.
* elf.c (assign_file_positions_for_load_sections): Use
hehdr_start.
ld/
* ldelf.c (ldelf_before_allocation): Use hehdr_start for
__ehdr_start hash.
* ldlang.c (lang_symbol_tweaks): Store hehdr_start hash in
hehdr_start.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Both of these targets extend elf_link_hash_entry, so arguably should
set hash_table_id to something other than GENERIC_ELF_DATA. The patch
also sorts enum elf_target_id.
These targets currently use GENERIC_ELF_DATA as their target_id, but
that isn't exactly correct. While their bfd tdata is generic elf,
their elf_section_data is extended with extra target data. Add
MMIX_ELF_DATA and SCORE_ELF_DATA.
The Nios II architecture has been EOL'ed by the vendor. This patch
removes all binutils, bfd, gas, binutils, and opcodes support for this
target with the exception of the readelf utility. (The ELF EM_*
number remains valid and the relocation definitions from the Nios II
ABI will never change in future, so retaining the readelf support
seems consistent with its purpose as a utility that tries to parse the
headers in any ELF file provided as an argument regardless of target.)
While for executables properly aligning sections within the file can be
quite relevant, the same is of pretty little importance for relocatable
object files. Avoid passing "true" into
_bfd_elf_assign_file_position_for_section() when dealing with object
files, but compensate minimally by applying log_file_align in such
cases as a cap to the alignment put in place.
Many uses of bfd_elf_sym_name report errors. They ought to not return
a NULL, as was the case prior to commit 68bbe11833. Introduce a new
function for cases where we'd like to know there is a problem with a
symbol st_name.
* elf-bfd.h (bfd_elf_sym_name_raw): Declare.
* elf.c (bfd_elf_sym_name_raw): New function.
(bfd_elf_sym_name): Revert to behaviour prior to 68bbe11833,
but returning "<null>" rather than "(null)" for st_name errors.
(group_signature): Use bfd_elf_sym_name_raw.
* elfcode.h (elf_slurp_symbol_table): Likewise.
* elf32-i386.c (elf_i386_scan_relocs): Whitespace.
This patch delays setting up elf_next_in_group, elf_sec_group and
elf_group_name when reading ELF object files until after all ELF
sections have been processed by bfd_section_from_shdr. This is simpler
and more robust than the current scheme of driving the whole process
on detecting a section with SHF_GROUP set.
* elf-bfd.h (struct elf_obj_tdata): Delete group_sect_ptr,
num_group and group_search_offset.
* elf.c (Elf_Internal_Group): Delete.
(setup_group): Delete function.
(IS_VALID_GROUP_SECTION_HEADER): Delete macro.
(is_valid_group_section_header),
(process_sht_group_entries): New functions.
(_bfd_elf_setup_sections): Handle group sections here..
(_bfd_elf_make_section_from_shdr): ..rather than here.
(bfd_section_from_shdr): Don't check SHT_GROUP validity here.
R_LARCH_ALIGN (psABI v2.30) requires a symbol index. The symbol is only
created at the first time to handle alignment directive. This means that
all other sections may use this symbol. If the section of this symbol is
discarded, there may be problems. Search it in its own section.
Remove elf_backend_data.is_rela_normal() function added at commit daeda14191.
Co-authored-by: Jinyang He <hejinyang@loongson.cn>
Reported-by: WANG Xuerui <git@xen0n.name>
Link: https://lore.kernel.org/loongarch/2abbb633-a10e-71cc-a5e1-4d9e39074066@loongson.cn/T/#t
Linker will resolve an undefined symbol only if it is referenced by
relocation. Unreferenced weak undefined symbols serve no purpose.
Weak undefined symbols appear in the dynamic symbol table only when they
are referenced by dynamic relocation. Mark symbols with relocation and
strip undefined weak symbols if they don't have relocation and aren't
in the dynamic symbol table.
bfd/
PR ld/31652
* elf-bfd.h (elf_link_hash_entry): Add has_reloc.
* elf-vxworks.c (elf_vxworks_emit_relocs): Set has_reloc.
* elflink.c (_bfd_elf_link_output_relocs): Likewise.
(elf_link_output_extsym): Strip undefined weak symbols if they
don't have relocation and aren't in the dynamic symbol table.
ld/
PR ld/31652
* testsuite/ld-elf/elf.exp: Run undefweak tests.
* testsuite/ld-elf/undefweak-1.rd: New file.
* testsuite/ld-elf/undefweak-1a.s: Likewise.
* testsuite/ld-elf/undefweak-1b.s: Likewise.
* testsuite/ld-x86-64/weakundef-1.nd: Likewise.
* testsuite/ld-x86-64/weakundef-1a.s: Likewise.
* testsuite/ld-x86-64/weakundef-1b.s: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run undefweak tests.
Normally, the section contents is allocated by bfd_alloc which is freed
when the object is closed. But the .dynamic section contents is allocated
by bfd_realloc, which should be freed by calling free. Add a dynamic
field to elf_link_hash_table for the .dynamic section and free its
contents in _bfd_elf_link_hash_table_free.
* elf-bfd.h (elf_link_hash_table): Add dynamic.
* elflink.c (_bfd_elf_link_create_dynamic_sections): Set the
dynamic field in elf_link_hash_table.
(_bfd_elf_add_dynamic_entry): Use hash_table->dynamic.
(_bfd_elf_strip_zero_sized_dynamic_sections): Likewise.
(bfd_elf_add_dt_needed_tag): Likewise.
(elf_finalize_dynstr): Likewise.
(_bfd_elf_link_hash_table_free): Free htab->dynamic->contents.
(bfd_elf_final_link): Use htab->dynamic.
* elfxx-x86.c (_bfd_x86_elf_finish_dynamic_sections): Use
htab->elf.dynamic.
Add elf_link_first_hash_entry and use it for first_hash. Free first_hash
before freeing the main hash table.
PR ld/31482
PR ld/31489
* elf-bfd.h (elf_link_hash_table): Change first_hash to
bfd_hash_table.
* elflink.c (elf_link_first_hash_entry): New.
(elf_link_first_hash_newfunc): Likewise.
(elf_link_add_to_first_hash): Updated.
(elf_link_add_object_symbols): Initialize first_hash with
elf_link_first_hash_newfunc.
(elf_link_add_object_symbols): Updated.
(elf_link_add_archive_symbols): Likewise.
(_bfd_elf_link_hash_table_free): Free first_hash before freeing
the main hash table.
GCC doesn't put builtin function symbol references, which are defined in
the shared C library, in the IR symbol table. When linker rescans shared
objects and archives for newly added symbol references generated from the
IR inputs, it skips definitions of the builtin functions in shared
objects and archives.
Add first_hash to elf_link_hash_table to track unreferenced definitions
defined first in shared objects and archives. Always use them to resolve
any references.
bfd/
PR ld/31482
PR ld/31489
* elf-bfd.h (elf_link_hash_table): Add first_hash.
* elflink.c (elf_link_add_to_first_hash): New function.
(elf_link_add_object_symbols): Initialize first_hash for an IR
input. Always use the first definition in shared object. Add
the first unreferenced dynamic definition to first_hash.
(_bfd_elf_archive_symbol_lookup): Add the first unreferenced
definition to first_hash..
(elf_link_add_archive_symbols): Use the symbol definition in
archive if symbol is defined first in this archive.
(_bfd_elf_link_hash_table_free): Also free first_hash.
ld/
PR ld/31482
PR ld/31489
* testsuite/ld-plugin/lto.exp: Add PR ld/31482 and PR ld/31489
tests.
* testsuite/ld-elf/pr31482a-no-lto.c: New file.
* testsuite/ld-elf/pr31482b-no-lto.c: Likewise.
* testsuite/ld-elf/pr31482c-no-lto.c: Likewise.
* testsuite/ld-elf/pr31482d-no-lto.c: Likewise.
* testsuite/ld-plugin/pass1.out: Likewise.
* testsuite/ld-plugin/pr31482a.c: Likewise.
* testsuite/ld-plugin/pr31482b.c: Likewise.
* testsuite/ld-plugin/pr31482c.c: Likewise.
To copy input section contents, add _bfd_elf_link_mmap_section_contents
and _bfd_elf_link_munmap_section_contents to mmap in the input sections.
* elf-bfd.h (_bfd_elf_link_mmap_section_contents): New.
(_bfd_elf_link_munmap_section_contents): Likewise.
* elf.c (elf_mmap_section_contents): New.
(_bfd_elf_mmap_section_contents): Use it.
(_bfd_elf_link_mmap_section_contents): New.
(_bfd_elf_link_munmap_section_contents): Likewise.
* elflink.c (elf_link_input_bfd): Call
_bfd_elf_link_mmap_section_contents instead of
bfd_get_full_section_contents. Call
_bfd_elf_link_munmap_section_contents to munmap the section
contents.
(bfd_elf_final_link): When mmap is used, initialize
max_contents_size to _bfd_minimum_mmap_size and increase it
for compressed or linker created sections or sections whose
rawsize != size.
PR 31458
bfd/
* elf-bfd.h (_bfd_elf_link_read_relocs),
(_bfd_elf_link_info_read_relocs): Constify section.
* elflink.c: Likewise.
* elfxx-mips.c (_bfd_mips_elf_eh_frame_address_size): Read
relocs again in case --no-keep-memory.
ld/
* testsuite/ld-mips-elf/mips-elf.exp: Run --no-keep-memory
version of eh-frame3 test.
This largely mechanical patch is preparation for a followup patch.
For quite some time I've thought that it would be useful to call
elf_backend_size_dynamic_sections even when no dynamic objects are
seen by the linker. That's what this patch does, with some renaming.
There are no functional changes to the linker, just a move of the
dynobj test in bfd_elf_size_dynamic_sections to target backend
functions, replacing the asserts/aborts already there. No doubt some
of the current always_size_sections functions could be moved to
size_dynamic_sections but I haven't made that change.
Because both hooks are now always called, I have renamed
always_size_sections to early_size_sections and size_dynamic_sections
to late_size_sections. I condisdered calling late_size_sections plain
size_sections, since this is the usual target dynamic section sizing
hook, but decided that searching the sources for "size_sections" would
then hit early_size_sections and other functions.
To represent the first and third expression of .align, R_LARCH_ALIGN need to
associate with a symbol. We define a local symbol for R_LARCH_AGLIN.
But if the section of the local symbol is discarded, it may result in
a undefined symbol error.
Instead, we use the section name symbols, and this does not need to
add extra symbols.
During partial linking (ld -r), if the symbol associated with a relocation is
STT_SECTION type, the addend of relocation needs to add the section output
offset. We prevent it for R_LARCH_ALIGN.
The elf_backend_data.rela_normal only can set all relocations of a target to
rela_normal. Add a new function is_rela_normal to elf_backend_data, it can
set part of relocations to rela_normal.
When -z mark-plt is used to add DT_X86_64_PLT, DT_X86_64_PLTSZ and
DT_X86_64_PLTENT, the r_addend field of the R_X86_64_JUMP_SLOT relocation
stores the offset of the indirect branch instruction. However, glibc
versions which don't have this commit in glibc 2.36:
commit f8587a61892cbafd98ce599131bf4f103466f084
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri May 20 19:21:48 2022 -0700
x86-64: Ignore r_addend for R_X86_64_GLOB_DAT/R_X86_64_JUMP_SLOT
According to x86-64 psABI, r_addend should be ignored for R_X86_64_GLOB_DAT
and R_X86_64_JUMP_SLOT. Since linkers always set their r_addends to 0, we
can ignore their r_addends.
Reviewed-by: Fangrui Song <maskray@google.com>
won't ignore the r_addend value in the R_X86_64_JUMP_SLOT relocation.
Although this commit has been backported to glibc 2.33/2.34/2.35 release
branches, it is safer to require glibc 2.36 for such binaries.
Extend the glibc version dependency of GLIBC_ABI_DT_RELR for DT_RELR to
also add GLIBC_2.36 version dependency for -z mark-plt on the shared C
library if it provides a GLIBC_2.XX symbol version.
* elflink.c (elf_find_verdep_info): Moved to ...
* elf-bfd.h (elf_find_verdep_info): Here.
(elf_backend_data): Add elf_backend_add_glibc_version_dependency.
(_bfd_elf_link_add_glibc_version_dependency): New function.
(_bfd_elf_link_add_dt_relr_dependency): Likewise.
* elf64-x86-64.c (elf_x86_64_add_glibc_version_dependency):
Likewise.
(elf_backend_add_glibc_version_dependency): New.
* elflink.c (elf_link_add_dt_relr_dependency): Renamed to ...
(elf_link_add_glibc_verneed): This. Modified to support other
glibc dependencies.
(_bfd_elf_link_add_glibc_version_dependency): Likewise.
(_bfd_elf_link_add_dt_relr_dependency): Likewise.
(bfd_elf_size_dynamic_sections): Call
elf_backend_add_glibc_version_dependency instead of
elf_link_add_dt_relr_dependency.
* elfxx-target.h (elf_backend_add_glibc_version_dependency): New.
(elfNN_bed): Add elf_backend_add_glibc_version_dependency.
ld/
* testsuite/ld-x86-64/mark-plt-1a.rd: New file.
* testsuite/ld-x86-64/mark-plt-1b.rd: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run -z mark-plt test for
GLIBC_2.36 dependency.
Adds two new external authors to etc/update-copyright.py to cover
bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then
updates copyright messages as follows:
1) Update cgen/utils.scm emitted copyrights.
2) Run "etc/update-copyright.py --this-year" with an extra external
author I haven't committed, 'Kalray SA.', to cover gas testsuite
files (which should have their copyright message removed).
3) Build with --enable-maintainer-mode --enable-cgen-maint=yes.
4) Check out */po/*.pot which we don't update frequently.
PR 30886 * elf-bfd.h (struct elf_obj_tdata): Add dt_strsz field.
* elf.c (_bfd_elf_get_dynamic_symbols): Add a NUL byte at the end of the string table. Initialise the dt_strsz field. (_bfd_elf_slurp_version_tables): Only free the contents if they were malloc'ed. Add checks before setting string pointers in the dt_strtab buffer.
The Scalable Matrix Extension v2 (SME2) defines a new register, ZT0, that
the Linux Kernel handles through a new NT_ARM_ZT register set.
Teach binutils/BFD about it so that gdb can make use of it for reading
and writing core files. This also enables readelf/objdump to show the
correct identification for the NT_ARM_ZT register set.
Validated under Fast Models.
Add required code to support core file dumps with NT_ARM_ZA and NT_ARM_SSVE
register sets in them.
These new register sets are dumped when SME is supported.
When there is no section header in an executable or shared library, we
reconstruct dynamic symbol table from the PT_DYNAMIC segment, which
contains DT_HASH/DT_GNU_HASH/DT_MIPS_XHASH, DT_STRTAB, DT_SYMTAB,
DT_STRSZ, and DT_SYMENT entries, to improve nm and objdump. For DT_HASH,
the number of dynamic symbol table entries equals the number of chains.
For DT_GNU_HASH/DT_MIPS_XHASH, only defined symbols with non-STB_LOCAL
indings are in hash table. Since DT_GNU_HASH/DT_MIPS_XHASH place all
symbols with STB_LOCAL binding before symbols with other bindings and
all undefined symbols defined ones in dynamic symbol table, the highest
symbol index in DT_GNU_HASH/DT_MIPS_XHASH is the highest dynamic symbol
table index. We can also get symbol version from DT_VERSYM, DT_VERDEF
and DT_VERNEED entries.
dt_symtab, dt_versym, dt_verdef, dt_verneed, dt_symtab_count,
dt_verdef_count, dt_verneed_count and dt_strtab are added to
elf_obj_tdata to store dynamic symbol table information.
PR ld/25617
* elf-bfd.h (elf_obj_tdata): Add dt_symtab, dt_verdef, dt_verneed,
dt_symtab_count, dt_verdef_count, dt_verneed_count and dt_strtab.
(elf_use_dt_symtab_p): New.
(_bfd_elf_get_dynamic_symbols): Likewise.
(_bfd_elf_get_section_from_dynamic_symbol): Likewise.
* elf.c (bfd_elf_get_elf_syms): Use dynamic symbol table if
neeeded.
(_bfd_elf_get_dynamic_symtab_upper_bound): Likewise.
(_bfd_elf_slurp_version_tables): Likewise.
(offset_from_vma): New function.
(get_hash_table_data): Likewise.
(_bfd_elf_get_dynamic_symbols): Likewise.
(_bfd_elf_get_section_from_dynamic_symbol): Likewise.
(_bfd_elf_get_symbol_version_name): Likewise.
* elfcode.h (elf_object_p): Call _bfd_elf_get_dynamic_symbols
to reconstruct dynamic symbol table from PT_DYNAMIC segment if
there is no section header.
(elf_slurp_symbol_table): Use dynamic symbol table if neeeded.
Don't free isymbuf when dynamic symbol table is used.
* elflink.c (elf_link_is_defined_archive_symbol): Return wrong
format error when dynamic symbol table is used.
(elf_link_add_object_symbols): Likewise.
doc/bfdint.texi and comments in the aout and som code about this
function are just wrong, and its name is not very apt. Better would
be _bfd_mostly_destroy, and we certainly should not be saying anything
about the possibility of later recreating anything lost by this
function. What's more, if _bfd_free_cached_info is called when
creating an archive map to reduce memory usage by throwing away
symbols, the target _close_and_cleanup function won't have access to
tdata or section bfd_user_data to tidy memory. This means most of the
target _close_and_cleanup function won't do anything, and therefore
sometimes will result in memory leaks.
This patch fixes the documentation problems and moves most of the
target _close_and_cleanup code to target _bfd_free_cached_info.
Another notable change is that bfd_generic_bfd_free_cached_info is now
defined as _bfd_free_cached_info rather than _bfd_bool_bfd_true,
ie. the default now frees objalloc memory.
SFrame format is meant for generating stack traces only.
bfd/
* elf-bfd.h: Replace the use of "unwind" with "stack trace".
* elf-sframe.c: Likewise.
* elf64-x86-64.c: Likewise.
* elfxx-x86.c: Likewise.
include/
* elf/common.h: Likewise.
The newer update-copyright.py fixes file encoding too, removing cr/lf
on binutils/bfdtest2.c and ld/testsuite/ld-cygwin/exe-export.exp, and
embedded cr in binutils/testsuite/binutils-all/ar.exp string match.
The linker merges all the input .sframe sections. When merging, the
linker verifies that all the input .sframe sections have the same
abi/arch.
The linker uses libsframe library to perform key actions on the
.sframe sections - decode, read, and create output data. This
implies buildsystem changes to make and install libsframe before
libbfd.
The linker places the output .sframe section in a new segment of its
own: PT_GNU_SFRAME. A new segment is not added, however, if the
generated .sframe section is empty.
When a section is discarded from the final link, the corresponding
entries in the .sframe section for those functions are also deleted.
The linker sorts the SFrame FDEs on start address by default and sets
the SFRAME_F_FDE_SORTED flag in the .sframe section.
This patch also adds support for generation of SFrame unwind
information for the .plt* sections on x86_64. SFrame unwind info is
generated for IBT enabled PLT, lazy/non-lazy PLT.
The existing linker option --no-ld-generated-unwind-info has been
adapted to include the control of whether .sframe unwind information
will be generated for the linker generated sections like PLT.
Changes to the linker script have been made as necessary.
ChangeLog:
* Makefile.def: Add install dependency on libsframe for libbfd.
* Makefile.in: Regenerated.
* bfd/Makefile.am: Add elf-sframe.c
* bfd/Makefile.in: Regenerated.
* bfd/bfd-in2.h (SEC_INFO_TYPE_SFRAME): Regenerated.
* bfd/configure: Regenerate.
* bfd/configure.ac: Add elf-sframe.lo.
* bfd/elf-bfd.h (struct sframe_func_bfdinfo): New struct.
(struct sframe_dec_info): Likewise.
(struct sframe_enc_info): Likewise.
(struct elf_link_hash_table): New member for encoded .sframe
object.
(struct output_elf_obj_tdata): New member.
(elf_sframe): New access macro.
(_bfd_elf_set_section_sframe): New declaration.
* bfd/elf.c (get_segment_type): Handle new segment
PT_GNU_SFRAME.
(bfd_section_from_phdr): Likewise.
(get_program_header_size): Likewise.
(_bfd_elf_map_sections_to_segments): Likewise.
* bfd/elf64-x86-64.c (elf_x86_64_link_setup_gnu_properties): Add
contents to the .sframe sections or .plt* entries.
* bfd/elflink.c (elf_section_ignore_discarded_relocs): Handle
SEC_INFO_TYPE_SFRAME.
(_bfd_elf_default_action_discarded): Handle .sframe section.
(elf_link_input_bfd): Merge .sframe section.
(bfd_elf_final_link): Write the output .sframe section.
(bfd_elf_discard_info): Handle discarding .sframe section.
* bfd/elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Create
.sframe section for .plt and .plt.sec.
(_bfd_x86_elf_finish_dynamic_sections): Handle .sframe from
.plt* sections.
* bfd/elfxx-x86.h (PLT_SFRAME_FDE_START_OFFSET): New
definition.
(SFRAME_PLT0_MAX_NUM_FRES): Likewise.
(SFRAME_PLTN_MAX_NUM_FRES): Likewise.
(struct elf_x86_sframe_plt): New structure.
(struct elf_x86_link_hash_table): New member.
(struct elf_x86_init_table): New members for .sframe
creation.
* bfd/section.c: Add new definition SEC_INFO_TYPE_SFRAME.
* binutils/readelf.c (get_segment_type): Handle new segment
PT_GNU_SFRAME.
* ld/ld.texi: Update documentation for
--no-ld-generated-unwind-info.
* ld/scripttempl/elf.sc: Support .sframe sections.
* ld/Makefile.am (TESTSFRAMELIB): Use it.
(check-DEJAGNU): Likewise.
* ld/Makefile.in: Regenerated.
* ld/configure.ac (TESTSFRAMELIB): Set to the .so or .a like TESTBFDLIB.
* ld/configure: Regenerated.
* bfd/elf-sframe.c: New file.
include/ChangeLog:
* elf/common.h (PT_GNU_SFRAME): New definition.
* elf/internal.h (struct elf_segment_map): Handle new segment
type PT_GNU_SFRAME.
ld/testsuite/ChangeLog:
* ld/testsuite/ld-bootstrap/bootstrap.exp: Add SFRAMELIB.
* ld/testsuite/ld-aarch64/aarch64-elf.exp: Add new test
sframe-simple-1.
* ld/testsuite/ld-aarch64/sframe-bar.s: New file.
* ld/testsuite/ld-aarch64/sframe-foo.s: Likewise.
* ld/testsuite/ld-aarch64/sframe-simple-1.d: Likewise.
* ld/testsuite/ld-sframe/sframe-empty.d: New test.
* ld/testsuite/ld-sframe/sframe-empty.s: New file.
* ld/testsuite/ld-sframe/sframe.exp: New testsuite.
* ld/testsuite/ld-x86-64/sframe-bar.s: New file.
* ld/testsuite/ld-x86-64/sframe-foo.s: Likewise.
* ld/testsuite/ld-x86-64/sframe-simple-1.d: Likewise.
* ld/testsuite/ld-x86-64/sframe-plt-1.d: Likewise.
* ld/testsuite/ld-x86-64/sframe-simple-1.d: Likewise.
* ld/testsuite/ld-x86-64/x86-64.exp: Add new tests -
sframe-simple-1, sframe-plt-1.
* ld/testsuite/lib/ld-lib.exp: Add new proc to check if
assembler supports SFrame section.
* ld/testsuite/ld-sframe/discard.d: New file.
* ld/testsuite/ld-sframe/discard.ld: Likewise.
* ld/testsuite/ld-sframe/discard.s: Likewise.
This patch is based on MULTIPLE_FRAME_SECTIONS and EH_FRAME_LINKONCE,
it allows backend to enable this feature and use '--gc-sections' simply.
* gas/dw2gencfi.h (TARGET_MULTIPLE_EH_FRAME_SECTIONS): New.
(MULTIPLE_FRAME_SECTIONS): Add TARGET_MULTIPLE_EH_FRAME_SECTIONS.
* gas/dw2gencfi.c (EH_FRAME_LINKONCE): Add TARGET_MULTIPLE_EH_FRAME_SECTIONS.
(is_now_linkonce_segment): Likewise.
(get_cfi_seg): Create relocation info between .eh_frame.* and .text.* section.
* bfd/elf-bfd.h (elf_backend_can_make_multiple_eh_frame): New.
* bfd/elfxx-target.h (elf_backend_can_make_multiple_eh_frame): Likewise.
* bfd/elflink.c (_bfd_elf_default_action_discarded): Add checking for
elf_backend_can_make_multiple_eh_frame.
bfd_find_nearest_line_with_alt functions like bfd_find_nearest_line with
the addition of a parameter for specifying the filename of a supplementary
debug file such as one referenced by .gnu_debugaltlink or .debug_sup.
This patch focuses on implementing bfd_find_nearest_line_with_alt
support for ELF/DWARF2 .gnu_debugaltlink. For other targets this
function simply sets the invalid_operation bfd_error.
