I was looking at a current glibc using objdump today and saw an odd
plt call stub.
0000000000044d80 <00000033.plt_call.__strchrnul>:
44d80: f8 41 00 28 std r2,40(r1)
44d84: e9 82 8c f8 ld r12,-29448(r2)
44d88: 7d 89 03 a6 mtctr r12
44d8c: e8 42 8d 00 ld r2,-29440(r2)
44d90: 28 22 00 00 cmpldi r2,0
44d94: 4c e2 04 20 bnectr+
44d98: 48 13 84 f0 b 17d288 <realloc@plt>
What? It doesn't branch to __strchrnul@plt on finding a zero r2?
Turns out this isn't a real problem since the stub is for loading an
ifunc, so will not be lazily resolved and thus r2 will never be zero.
Of course, that means the thread-safety check is unnecessary.
I also tweak the special __tls_get_addr_opt call stub here, to
restore r2 immediately after the call. Not doing that might affect
eh_frame unwinding.
* elf64-ppc.c (plt_stub_size, build_plt_stub): Don't build
thread-safe stubs for iplt.
(build_tls_get_addr_stub): Restore r2 immediately after call.
Rather than reporting a link error on attempting to use dynbss for
protected vars, use dynamic text relocs.
* elf32-ppc.c (ppc_elf_adjust_dynamic_symbol): Heed -z nocopyreloc.
Use text relocs rather than giving an error on trying to use
.dynbss for protected shared lib vars.
* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Likewise.
Make use of the data held within the .avr.prop section during linker
relaxation in order to maintain the properties of the .org and .align
directives.
In relation to the .align directives, if enough bytes are deleted before
a .align directive then the alignment can be moved while still
maintaining the alignment requirement.
bfd/ChangeLog:
* elf32-avr.c (struct elf_avr_section_data): New structure.
(struct avr_relax_info): New structure.
(elf_avr_new_section_hook): New function.
(struct elf_avr_section_data): Add relax_info.
(get_avr_relax_info): New function.
(init_avr_relax_info): New function.
(elf32_avr_relax_delete_bytes): Find next property record before
deleting bytes. When deleting don't move bytes beyond the next
property record.
(avr_elf32_assign_records_to_section): New function.
(avr_property_record_compare): New function.
(avr_load_all_property_sections): New function.
(elf32_avr_relax_section): Load property data. After relaxing the
section, move any .align directives that have enough deleted bytes
before them.
(bfd_elf32_new_section_hook): Define.
ld/testsuite/ChangeLog:
* ld-avr/avr-prop-1.d: New file.
* ld-avr/avr-prop-1.s: New file.
* ld-avr/avr-prop-2.d: New file.
* ld-avr/avr-prop-2.s: New file.
* ld-avr/avr-prop-3.d: New file.
* ld-avr/avr-prop-3.s: New file.
* ld-avr/avr-prop-4.d: New file.
* ld-avr/avr-prop-4.s: New file.
Add support to objdump for dumping the .avr.prop section in a structured
way.
binutils/ChangeLog:
* od-elf32_avr.c: Add elf32-avr.h include.
(OPT_AVRPROP): Define.
(options[]): Add 'avr-prop' entry.
(elf32_avr_help): Add avr-prop help text.
(elf32_avr_dump_avr_prop): New function.
(elf32_avr_dump): Add check for avr-prop.
bfd/ChangeLog:
* elf32-avr.h (struct avr_property_header): New strucure.
(avr_elf32_load_property_records): Declare.
(avr_elf32_property_record_name): Declare.
* elf32-avr.c: Add bfd_stdint.h include.
(retrieve_local_syms): New function.
(get_elf_r_symndx_section): New function.
(get_elf_r_symndx_offset): New function.
(internal_reloc_compare): New function.
(struct avr_find_section_data): New structure.
(avr_is_section_for_address): New function.
(avr_find_section_for_address): New function.
(avr_elf32_load_records_from_section): New function.
(avr_elf32_load_property_records): New function.
(avr_elf32_property_record_name): New function.
gas/testsuite/ChangeLog:
* gas/avr/avr-prop-1.d: New file.
* gas/avr/avr-prop-1.s: New file.
Adds support to the assembler to write out data for tracking the use of
.org and .align directives. This data is collected within the assembler
and written out to a section ".avr.prop" (if there's anything to write
out).
This patch does not add any tests. The next patch in this series will
add a better mechanism for visualising the contents of .avr.prop which
will make writing tests much easier.
This patch also does not make any use of this collected data, that will
also come along in a later patch; the intended consumer is the linker,
during linker relaxation this information will be used to ensure that
the .org and .align directives are honoured.
bfd/ChangeLog:
* elf32-avr.h (AVR_PROPERTY_RECORD_SECTION_NAME): Define.
(AVR_PROPERTY_RECORDS_VERSION): Define.
(AVR_PROPERTY_SECTION_HEADER_SIZE): Define.
(struct avr_property_record): New structure.
gas/ChangeLog:
* config/tc-avr.c: Add elf32-avr.h include.
(struct avr_property_record_link): New structure.
(avr_output_property_section_header): New function.
(avr_record_size): New function.
(avr_output_property_record): New function.
(avr_create_property_section): New function.
(avr_handle_align): New function.
(exclude_section_from_property_tables): New function.
(create_record_for_frag): New function.
(append_records_for_section): New function.
(avr_create_and_fill_property_section): New function.
(avr_post_relax_hook): New function.
* config/tc-avr.h (md_post_relax_hook): Define.
(avr_post_relax_hook): Declare.
(HANDLE_ALIGN): Define.
(avr_handle_align): Declare.
(strut avr_frag_data): New structure.
(TC_FRAG_TYPE): Define.
bfd * elf32-v850.c (v850_set_note): New function. Creates a Renesas
style note entry.
(v850_elf_make_note_section): New function. Creates a note
section.
(v850_elf_create_sections): New function. Create a note section
if one is not already present.
(v850_elf_set_note): New function. Adds a note to a bfd.
(v850_elf_copy_private_bfd_data): New function. Copies V850
notes.
(v850_elf_merge_notes): New function. Merges V850 notes.
(print_v850_note): New function. Displays a V850 note.
(v850_elf_print_notes): New function. Displays all notes attached
to a bfd.
(v850_elf_merge_private_bfd_data): Call v850_elf_merge_notes.
(v850_elf_print_private_bfd_data): Call v850_elf_print_notes.
(v850_elf_fake_sections): Set the type of the V850 note section.
* bfd-in.h (v850_elf_create_sections): Add prototype.
(v850_elf_set_note): Add prototype.
* bfd-in2.h: Regenerate.
binutils* readelf.c (get_machine_flags): Remove deprecated V850 machine
flags.
(get_v850_section_type_name): New function. Handles V850 special
sections.
(get_section_type_name): Add support for V850.
(get_v850_elf_note_type): New function. Returns the name of a
V850 note.
(print_v850_note): New function. Prints a V850 note.
(process_v850_notes): New function. Prints V850 notes.
(process_note_sections): Add support for V850.
binutils/testsute
* binutils-all/objcopy.exp: Skip the strip-10 test for the V850.
gas * config/tc-v850.c (soft_float): New variable.
(v850_data_8): New variable.
(md_show_usage): Add -msoft-float/-mhard-float.
(md_parse_option): Likewise.
(md_begin): Set the default value of soft_float.
(v850_md_end): New function. Creates a note section.
* config/tc-v850.h (md_end): Define.
* doc/c-v850.texi: Document -msoft-float/-mhard-float.
gas/testsuite
* gas/elf/elf.exp: Add special version of the section2 test for
the V850.
* gas/elf/section2.e-v850: New file.
include/elf
* v850.h (EF_RH850_SIMD): Delete deprecated flag.
(EF_RH850_CACHE): Likewise.
(EF_RH850_MMU): Likewise.
(EF_RH850_DATA_ALIGN8): Likewise.
(SHT_RENESAS_IOP): Fix typo in name.
(SHT_RENESAS_INFO): Define.
(V850_NOTE_SECNAME): Define.
(SIZEOF_V850_NOTE): Define.
(V850_NOTE_NAME): Define.
(enum v850_notes): New enum.
(NUM_V850_NOTES): Define.
ld/ChangeLog
2015-02-24 Nick Clifton <nickc@redhat.com>
* Makefile.am (ev850.c): Add dependency upon
$(srcdir)/emultempl/v850elf.em.
(ev850_rh850.c): Likewise.
* Makefile.in: Regenerate.
* emultempl/v850elf.em: New file.
* emulparams/v850.sh (EXTRA_EM_FILE): Define.
* emulparams/v850_rh850.sh (EXTRA_EM_FILE): Define.
* scripttempl/v850.sc: Add .note.renesas section.
* scripttempl/v850_rh850.sc: Likewise.
ld/testsuite
* ld-elf/extract-symbol-1sec.d: Expect to fail on the V850.
* configure.ac (AC_CHECK_HEADERS): Add wctype.h.
* configure: Regenerate.
* config.in: Regenerate.
* peXXigen.c: Include wctype.h if HAVE_WCTYPE_H is defined.
(u16_mbtowc): Use wint_t types if HAVE_WCTYPE_H is defined.
(rsrc_cmp): Use towlower instead of wcsncasecmp if HAVE_WCTYPE_H
is defined.
PR 17940
* dwarf2dbg.c (out_header): When generating dwarf sections use
real symbols not temps for the start and end symbols.
* config/tc-msp430.h (TC_FORCE_RELOCATION_SUB_SAME): Also prevent
adjustments to relocations in debug sections.
(TC_LINKRELAX_FIXUP): Likewise.
* elf32-msp430.c (msp430_elf_relax_delete_bytes): Adjust debug
symbols at end of sections. Adjust function sizes.
The IBM z13 has new 128-bit wide vector registers v0-v31, where v0-v15
include the existing 64-bit wide floating point registers. The Linux
kernel presents the vector registers as two additional register sets,
one for the right halves of v0-v15 and another one for the full
registers v16-v31. Thus a new core file may contain two new register
note sections, and this patch adds support to binutils for them.
bfd/
* elf-bfd.h (elfcore_write_s390_vxrs_low): Add prototype.
(elfcore_write_s390_vxrs_high): Likewise.
* elf.c (elfcore_grok_s390_vxrs_low): New function.
(elfcore_grok_s390_vxrs_high): New function.
(elfcore_grok_note): Call them.
(elfcore_write_s390_vxrs_low): New function.
(elfcore_write_s390_vxrs_high): New function.
(elfcore_write_register_note): Call them.
binutils/
* readelf.c (get_note_type): Add NT_S390_VXRS_LOW and
NT_S390_VXRS_HIGH.
include/elf/
* common.h (NT_S390_VXRS_LOW): New macro.
(NT_S390_VXRS_HIGH): Likewise.
I was having a little closer look at what is going on here and noticed
that HJ unconditionally emits a NULL STT_FILE symbol before emitting
forced local symbols. That means we really don't need a second pass
over forced local symbols. The only reason for two passes is when
some forced local symbol can be emitted before the NULL STT_FILE. So
I set about removing the second pass, updating the testsuite all over
again. It's also unnecessary to emit the NULL STT_FILE when no
previous file symbol has been emitted.
bfd/
PR ld/17975
* elflink.c (struct elf_outext_info): Remove need_second_pass
and second_pass.
(elf_link_output_extsym): Delete code handling second forced
local pass. Move code emitting NULL STT_FILE symbol later, so
that it can be omitted if forced local is stripped. Don't
emit the NULL STT_FILE if no file symbols have been output.
(bfd_elf_final_link): Remove second forced local pass.
* elf32-ppc.c (add_stub_sym): Set linker_def on linker syms.
(ppc_elf_size_dynamic_sections): Likewise.
* elf64-ppc.c (ppc_build_one_stub): Likewise.
(build_global_entry_stubs): Likewise.
(ppc64_elf_build_stubs): Likewise.
ld/testsuite/
PR ld/17975
* ld-aarch64/gc-tls-relocs.d, * ld-alpha/tlspic.rd,
* ld-cris/libdso-2.d, * ld-i386/tlsdesc-nacl.rd, * ld-i386/tlsdesc.rd,
* ld-i386/tlsnopic-nacl.rd, * ld-i386/tlsnopic.rd,
* ld-i386/tlspic-nacl.rd, * ld-i386/tlspic.rd, * ld-ia64/tlspic.rd,
* ld-powerpc/tlsexe.r, * ld-powerpc/tlsexetoc.r,
* ld-powerpc/tlsso.r, * ld-powerpc/tlstocso.r,
* ld-s390/tlspic.rd, * ld-s390/tlspic_64.rd,
* ld-sparc/tlssunnopic32.rd, * ld-sparc/tlssunnopic64.rd,
* ld-sparc/tlssunpic32.rd, * ld-sparc/tlssunpic64.rd,
* ld-tic6x/shlib-1.rd, * ld-tic6x/shlib-1b.rd, * ld-tic6x/shlib-1r.rd,
* ld-tic6x/shlib-1rb.rd, * ld-tic6x/shlib-noindex.rd,
* ld-x86-64/tlsdesc-nacl.rd, * ld-x86-64/tlsdesc.rd,
* ld-x86-64/tlspic-nacl.rd, * ld-x86-64/tlspic.rd: Update.
We output a NULL STT_FILE symbol for forced local symbols so that they
are not associated with the STT_FILE symbol for real local symbols. This
patch makes sure that the NULL STT_FILE symbol is placed before forced
local symbols.
bfd/
PR ld/17975
* elflink.c (elf_link_output_extsym): Only check filesym_count
when outputting a NULL FILE symbol. Set second_pass_sym to
h->forced_local && !h->root.linker_def.
ld/testsuite/
PR ld/17975
* ld-i386/tlsbin-nacl.rd: Likewise.
* ld-i386/tlsbin.rd: Likewise.
* ld-i386/tlsbindesc-nacl.rd: Likewise.
* ld-i386/tlsbindesc.rd: Likewise.
* ld-i386/tlsdesc-nacl.rd: Likewise.
* ld-i386/tlsdesc.rd: Likewise.
* ld-i386/tlsnopic-nacl.rd: Likewise.
* ld-i386/tlsnopic.rd: Likewise.
* ld-i386/tlspic-nacl.rd: Likewise.
* ld-i386/tlspic.rd: Likewise.
* ld-x86-64/tlsbin-nacl.rd: Likewise.
* ld-x86-64/tlsbin.rd: Likewise.
* ld-x86-64/tlsbindesc-nacl.rd: Likewise.
* ld-x86-64/tlsbindesc.rd: Likewise.
* ld-x86-64/tlsdesc-nacl.rd: Likewise.
* ld-x86-64/tlsdesc.rd: Likewise.
* ld-x86-64/tlspic-nacl.rd: Likewise.
* ld-x86-64/tlspic.rd: Likewise.
LTO output objects have an STT_FILE symbol using the name of the file,
a temporary file. This results in executables that can't be exactly
reproduced, so the file name needs to be dropped. We don't want to
lose all file symbols when linking a mix of lto and non-lto objects as
a file symbol can be used to figure which source file generated a
given local symbol. So lto output objects need to be marked.
I chose to mark lto output objects with a new bfd flag. This flag is
also used to fix a bug in the link-once handling; An object being
loaded after "loading_lto_outputs" is set might be one extracted from
an archive to satisfy new references from lto objects, not an lto
object itself.
The new flag is copied from archive to elements, and the same done
for no_export. This fixes a bug in that --exclude-libs doesn't work
with thin archives. I'm not completely happy with this part of the
patch and may revist this to avoid the hack in
_bfd_look_for_bfd_in_cache.
PR ld/17973
include/
* bfdlink.h (struct bfd_link_info): Delete loading_lto_outputs.
bfd/
* bfd.c (struct bfd): Add lto_output.
* linker.c (_bfd_handle_already_linked): Explicitly test for
objects added by the lto plugin.
* opncls.c (_bfd_new_bfd_contained_in): Copy lto_output and
no_export flags from archive.
* archive.c (open_nested_file): New function, setting lto_output
and no_export, extracted from..
(find_nested_archive): ..here. Flip params. Rename from
_bfd_find_nested_archive.
(_bfd_get_elt_at_filepos): Correct var typo. Use open_nested_file.
(_bfd_look_for_bfd_in_cache): Copy no_export.
* elflink.c (elf_link_add_object_symbols): Remove now unnecessary
my_archive->no_export test.
(elf_link_input_bfd): Drop existing lto_output STT_FILE syms.
Don't use the file name when adding lto_output STT_FILE sym.
* bfd-in2.h: Regenerate.
ld/
* ldlang.h (struct lang_input_statement_flags): Add lto_output.
* ldlang.c (lang_process): Don't set loading_lto_outputs.
* ldfile.c (ldfile_try_open_bfd): Transfer entry flags.lto_output
to bfd.
* plugin.c (add_input_file, add_input_library): Set flags.lto_output.
PR binutils/17512
* dwarf.c (read_1_byte, read_1_signed_byte, read_2_bytes)
(read_4_bytes, read_8_bytes, read_n_bytes, read_string)
(read_indirect_string, read_alt_indirect_string)
(read_alt_indirect_ref, read_address, read_abbrevs)
(read_attribute_value, read_attribute, decode_line_info)
(find_abstract_instance_name, read_rangelist)
(scan_unit_for_symbols, parse_comp_unit)
(_bfd_dwarf2_find_nearest_line): Harden DWARF reading code. Pass
end pointers to reading functions and check for offsets taking
pointers out of range. Replace calls to read_*_leb128 with calls
to safe_read_leb128.
(* elf64-ppc.c (opd_entry_value): Add a check for an overlarge
offset.
* syms.c (_bfd_stab_section_find_nearest_line): Add checks for
computed file_name address being before the start of the string
table.
Linker plugin_maybe_claim is the interface of linker plugin support.
This patch extracts linker plugin_maybe_claim into plugin_object_p and
makes it available to BFD via a new function:
void register_ld_plugin_object_p (const bfd_target *(*) (bfd *));
bfd_plugin_object_p calls plugin_object_p registered by linker first. It
adds an enum bfd_plugin_format field and a pointer to plugin dummy BFD so
that plugin_object_p stores plugin dummy BFD to allow plugin_maybe_claim
to retrieve it later.
bfd/
PR ld/17878
* bfd.c (bfd_plugin_format): New.
(bfd): Add plugin_format and plugin_dummy_bfd.
* plugin.c (try_load_plugin): Take a pointer to bfd_boolean
argument to return TRUE if any plugin is found. Set plugin_format.
(has_plugin): New.
(bfd_plugin_target_p): New.
(bfd_plugin_specified_p): Likewise.
(bfd_plugin_target_p): Likewise.
(register_ld_plugin_object_p): Likewise.
(bfd_plugin_set_plugin): Set has_plugin.
(load_plugin): Cache try_load_plugin result.
(bfd_plugin_object_p): Try ld_plugin_object_p first. Check
plugin_format.
* plugin.h (bfd_plugin_target_p): New.
(bfd_plugin_specified_p): Likewise.
(register_ld_plugin_object_p): Likewise.
* bfd-in2.h: Regenerated.
ld/
PR ld/17878
* plugin.c: Include ../bfd/plugin.h.
(plugin_get_ir_dummy_bfd): Call bfd_create with
link_info.output_bfd instead of srctemplate. Copy BFD info
from srctemplate only if it doesn't use BFD plugin target
vector.
(plugin_load_plugins): Call register_ld_plugin_object_p with
(plugin_object_p)
(plugin_maybe_claim): Renamed to ...
(plugin_object_p): This. Return dummy BFD target vector if
input is calimed by plugin library, otherwise return NULL.
Update plugin_format and plugin_dummy_bfd.
(plugin_maybe_claim): New. Use plugin_object_p.
xx
These were the BFD changes needed for building a C++ GDB with
--enable-targets=all, on x86_64 Fedora 20.
For libbfd.h and libcoff.h, this does same as already done when
generating bfd.h: open extern "C" in the -in.h header, and close it
from the Makefile.
bfd/doc/ChangeLog:
2015-02-11 Pedro Alves <palves@redhat.com>
* Makefile.am (libbfd.h, libcoff.h): Close extern "C" scope.
* Makefile.in: Regenerate.
bfd/ChangeLog:
2015-02-11 Pedro Alves <palves@redhat.com>
* libbfd-in.h [__cplusplus]: Open extern "C" scope.
* libcoff-in.h [__cplusplus]: Open extern "C" scope.
* libbfd.h: Regenerate.
* libcoff.h: Regenerate.
* elf-bfd.h [__cplusplus]: Wrap in extern "C".
* mach-o.h [__cplusplus]: Wrap in extern "C".
* som.h [__cplusplus]: Wrap in extern "C".
PR binutils/17512
* dwarf.c (eh_addr_size): Use an unsigned type.
(size_of_encoded_value): Return an unsigned type.
(read_leb128): Break if the shift becomes too big.
(process_extended_line_op): Do not read the address if the length
is too long.
(read_cie): Warn and fail if the pointer size or segment size are
too big.
* dwarf.h (DWARF2_External_LineInfo): Delete unused and incorrect
structure definition.
(DWARF2_External_PubNames): Likewise.
(DWARF2_External_CompUnit): Likewise.
(DWARF2_External_ARange): Likewise.
(DWARF2_Internal_LineInfo): Use dwarf_vma type for
li_prologue_length.
(eh_addr_size): Update prototype.
* coffcode.h (styp_to_sec_flags): Use an unsigned long type to
hold the flag bits.
* peXXigen.c (pe_print_reloc): Use unsigned types to hold the
size and number of relocs.
(pe_print_debugdata): Use a 32-bit aligned buffer to store the
codeview record.
* versados.c (process_otr): Check the esdid value before using it
to access the EDATA.
Real code won't hit these, but it's possible to contrive a testcase..
* elf32-ppc.c (ppc_elf_relocate_section): Don't segfault on NULL
tls_sec.
* elf64-ppc.c (ppc64_elf_relocate_section): Likewise.
* elflink.c (elf_link_output_extsym): Don't assert on NULL tls_sec.
* elflink.c: Whitespace, formatting fixes.
(elf_link_input_bfd): Clarify comment.
(elf_link_output_extsym): Exclude symbols in linker created
sections when testing for plugin symbols.
