max-page-size only matters for demand paged executables or shared
libraries, and the ideal size is the largest value used by your
operating system. Values larger than necessary just waste file space
and memory. common-page-size also affects file and memory size,
trading a possible small increase in file size for a decrease in
memory size when the operating system is using a common-page-size
page. With a powerpc max-page-size of 64k and common-page-size of 4k
many executables will use no more memory pages when the system page
size is 4k than an executable linked with -z max-page-size=0x1000,
yet will still run on a system using 64k pages. However, when running
on a system using 64k pages relro protection will not be completely
effective.
Due to the relro problem, powerpc binutils has been using a default
common-page-size of 64k since 2014-12-18 (git commit 04c6a44c7),
leading to complaints about increased file and memory sizes. People
not using relro do have a valid reason to complain..
So this patch introduces an extra back-end value to use as the default
for common-page-size when generating relro executables, and enables
the support for powerpc. Non relro executables will now be generated
with a default common-page-size of 4k.
bfd/
* elf-bfd.h (struct elf_backend_data): Add relropagesize.
* elfxx-target.h (ELF_RELROPAGESIZE): Provide default and
sanity test.
(elfNN_bed): Init relropagesize.
* bfd.c (bfd_emul_get_commonpagesize): Add boolean param to
select relropagesize.
* elf32-ppc.c (ELF_COMMONPAGESIZE): Define as 0x1000.
(ELF_RELROPAGESIZE): Define as ELF_MAXPAGESIZE.
(ELF_MINPAGESIZE): Don't define.
* elf64-ppc.c (ELF_COMMONPAGESIZE): Define as 0x1000.
(ELF_RELROPAGESIZE): Define as ELF_MAXPAGESIZE.
* bfd-in2.h: Regenerate.
ld/
* ldmain.c (main): Move config.maxpagesize and
config.commonpagesize initialization to..
* ldemul.c (after_parse_default): ..here.
* testsuite/ld-powerpc/ppc476-shared.d: Pass -z common-page-size.
* testsuite/ld-powerpc/ppc476-shared2.d: Likewise.
Necessary if gcc is to use PLT16 relocs to implement -mlongcall, and
there isn't a good technical reason why local symbols should be
excluded from PLT16 support. Non-ifunc local symbol PLT entries go in
a separate section to other PLT entries. In a fixed position
executable they won't need to be relocated, and in a PIE or shared
library I chose to not implement lazy relocation.
bfd/
* elf64-ppc.c (LOCAL_PLT_ENTRY_SIZE): Define.
(struct ppc_stub_hash_entry): Add symtype field.
(PLT_KEEP): Define.
(struct ppc_link_hash_table): Add pltlocal and relpltlocal.
(create_linkage_sections): Create pltlocal and relpltlocal.
(ppc64_elf_check_relocs): Allow PLT relocs on local symbols.
Set PLT_KEEP.
(ppc64_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls.
(allocate_dynrelocs): Allocate pltlocal and relpltlocal.
(ppc64_elf_size_dynamic_sections): Size pltlocal and relpltlocal.
Keep PLT entries for inline calls against locals.
(ppc_build_one_stub): Use pltlocal as appropriate.
(ppc_size_one_stub): Likewise.
(ppc64_elf_size_stubs): Set symtype.
(build_global_entry_stubs_and_plt): Init pltlocal and write
relpltlocal for globals.
(write_plt_relocs_for_local_syms): Likewise for local syms.
(ppc64_elf_relocate_section): Support PLT for local syms.
* elf32-ppc.c (PLT_KEEP): Define.
(struct ppc_elf_link_hash_table): Add pltlocal and relpltlocal.
(ppc_elf_create_glink): Create pltlocal and relpltlocal.
(ppc_elf_check_relocs): Allow PLT relocs on local symbols.
Set PLT_KEEP. Adjust update_local_sym_info call.
(ppc_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls.
(allocate_dynrelocs): Allocate pltlocal and relpltlocal.
(ppc_elf_size_dynamic_sections): Size pltlocal and relpltlocal.
(ppc_elf_relocate_section): Support PLT16 relocs for local syms.
(write_global_sym_plt): Init pltlocal and write relpltlocal.
(ppc_finish_symbols): Likewise for locals.
ld/
* emulparams/elf32ppc.sh (OTHER_RELRO_SECTIONS_2): Add .branch_lt.
(OTHER_GOT_RELOC_SECTIONS): Add .rela.branch_lt.
* testsuite/ld-powerpc/elfv2so.d: Update for symbol/stub reordering.
* testsuite/ld-powerpc/relbrlt.d: Likewise.
* testsuite/ld-powerpc/relbrlt.s: Likewise.
* testsuite/ld-powerpc/tlsso.r: Likewise.
* testsuite/ld-powerpc/tlstocso.r: Likewise.
gold/
* powerpc.cc (Target_powerpc::lplt_): New variable.
(Target_powerpc::lplt_section): Associated accessor.
(Target_powerpc::plt_off): Handle local non-ifunc symbols.
(Target_powerpc::make_lplt_section): New function.
(Target_powerpc::make_local_plt_entry): New function.
(Powerpc_relobj::do_relocate_sections): Write out lplt.
(Output_data_plt_powerpc::first_plt_entry_offset): Zero for lplt.
(Output_data_plt_powerpc::add_local_entry): New function.
(Output_data_plt_powerpc::do_write): Ignore lplt.
(Target_powerpc::make_iplt_section): Make lplt first.
(Target_powerpc::make_brlt_section): Make .branch_lt relro.
(Target_powerpc::Scan::local): Handle PLT16 relocs.
Complement commit 86b24e15c4 ("MIPS/LD/testsuite: Correct
comm-data.exp test ABI/emul/endian arrangement") and set LD emulations
correctly for `mips*-*-kfreebsd*-gnu' targets in comm-data.exp, removing
test suite failures:
FAIL: MIPS o32/copyreloc common symbol override test (auxiliary shared object build)
FAIL: MIPS o32/copyreloc common symbol override test
FAIL: MIPS o32/nocopyreloc common symbol override test (auxiliary shared object build)
FAIL: MIPS o32/nocopyreloc common symbol override test
ld/
* testsuite/ld-mips-elf/comm-data.exp: Correct support for
`mips*-*-kfreebsd*-gnu' targets.
This patch adds the following relocation support into binutils bfd linker.
BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12,
BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC,
BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12,
BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC,
BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12,
BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC,
BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12,
BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC.
Those relocations includes both ip64 and ilp32 variant.
This is a regression for the corner case of a hidden symbol in a PIC/PIE
binary which is subject to both a new-style GOTDATA relocation and an
old-style GOT relocation. In this case, depending on the link order,
the R_SPARC_RELATIVE dynamic relocation for the GOT slot needed because
of the old-style relocation can be replaced with R_SPARC_NONE coming
from the GOTDATA relocation.
The fix simply records whether an old-style GOT relocation is seen for a
symbol and prevents the R_SPARC_NONE from being generated in this case.
bfd/
* elfxx-sparc.c (struct _bfd_sparc_elf_link_hash_entry): Add new flag
has_old_style_got_reloc.
(_bfd_sparc_elf_check_relocs) <GOT relocations>: Set it for old-style
relocations. Fix a couple of long lines.
(_bfd_sparc_elf_relocate_section) <R_SPARC_GOTDATA_OP>: Do not generate
a R_SPARC_NONE for the GOT slot if the symbol is also subject to
old-style GOT relocations.
ld/
* testsuite/ld-sparc/sparc.exp: Add test for mixed GOTDATA/GOT relocs.
* testsuite/ld-sparc/gotop-hidden.c: New file.
* testsuite/ld-sparc/got-hidden32.s: Likewise.
* testsuite/ld-sparc/got-hidden64.s: Likewise.
* testsuite/ld-sparc/pass.out: Likewise.
The TLSDESC entry in a lazy procedure linkage table is called indirectly
with "callq *(%rax)". This patch adds an ENDBR64 to support indirect
branch tracking in Intel CET. The TLSDESC PLT entry now looks like:
0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
The BND prefix isn't needed since MPX isn't used for TLSDESC.
bfd/
PR ld/23000
* elf64-x86-64.c (elf_x86_64_finish_dynamic_sections): Add
ENDBR64 to the TLSDESC PLT entry.
ld/
PR ld/23000
* testsuite/ld-x86-64/tlsdesc.pd: Updated.
Complement commit 8988502d75 ("MIPS/LD/testsuite: Correct dynamic
links with VR4100, VR4300 and VR5000") and commit bf48520113 ("gc.exp:
Fix a typo: $LFLAGS -> $LDFLAGS"), and remove extraneous additional LD
flags explicitly passed to the personality test on invocation. This
passing has accidentally leaked from a WIP version of the former change.
With the actual version committed the $LDFLAGS global variable is used
instead for `run_dump_test' to use implicitly, so that `-call_shared'
precedes `-lpersonality' on the linker's command line, as otherwise a
shared `libpersonality.so' library wouldn't be considered for linking,
causing the test to fail.
ld/
* testsuite/ld-gc/gc.exp: Remove extraneous LD flags from the
personality test.
If a symbol is made dynamic by --dynamic-list, it has non-IR reference.
bfd/
PR ld/22983
* elflink.c (bfd_elf_link_mark_dynamic_symbol): Set
non_ir_ref_dynamic if a symbol is made dynamic by --dynamic-list.
ld/
PR ld/22983
* testsuite/ld-plugin/lto.exp: Run PR ld/22983 test.
* testsuite/ld-plugin/pr22983.d: New file.
* testsuite/ld-plugin/pr22983.t: Likewise.
* testsuite/ld-plugin/pr22983a.c: Likewise.
* testsuite/ld-plugin/pr22983b.c: Likewise.
Extend
commit b7c871edcd
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed May 17 07:57:15 2017 -0700
Mark debug sections referenced by kept debug sections
to handle the local debug definition section.
bfd/
PR ld/20882
* elflink.c (elf_gc_mark_debug_section): Also check the local
debug definition section.
ld/
PR ld/20882
* testsuite/ld-gc/pr20882.d: Also dump and check .debug_abbrev
section.
* testsuite/ld-gc/pr20882b.s: Add .debug_abbrev section.
Following on from PR 22929, I have found the same problem exists with
other ifunc supporting targets too. Plus see this link for the bug
being reported against the s390x binutils for Fedora rawhide:
https://bugzilla.redhat.com/show_bug.cgi?id=1553705
So I am going to check in the patch below which applies the same
change that H.J. made for the x86_64 target to the other affected
targets. (Specifically: S390, AArch64 and Sparc). Plus it adds a new
test to the linker testsuite to make sure that this problem stays
fixed.
bfd * elf64-s390.c (elf_s390_relocate_section): Move check for
relocations against non-allocated sections to before the code that
handles ifunc relocations.
* elf32-s390.c (elf_s390_relocate_section): Likewise.
* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Treat
relocs against IFUNC symbols in non-allocated sections as relocs
against FUNC symbols.
* elfxx-sparc.c (_bfd_sparc_elf_relocate_section): Likewise.
ld * testsuite/ld-ifunc/ifuncmod5.s: New test. Checks that targets
that support IFUNC symbols can handle relocations against those
symbols in NOTE sections.
* testsuite/ld-ifunc/ifuncmod5.d: New file: Driver for the new
test.
* testsuite/ld-ifunc/ifunc.exp: Run the new test.
When resolving a relocation against IFUNC symbol in a SHT_NOTE section
without SHF_ALLOC, we treat it as relocation against FUNC symbol since
it needs the address of IFUNC symbol, not the address returned by IFUNC
function.
bfd/
PR ld/22929
* elf32-i386.c (elf_i386_relocate_section): Treat relocation
against IFUNC symbol in SHT_NOTE section without SHF_ALLOC as
relocation against FUNC symbol.
* elf64-x86-64.c (elf_x86_64_relocate_section): Likewise.
ld/
PR ld/22929
* testsuite/ld-i386/i386.exp: Run PR ld/22929 test.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
* testsuite/ld-i386/pr22929.d: New file.
* testsuite/ld-i386/pr22929.s: Likewise.
* testsuite/ld-x86-64/pr22929.d: Likewise.
* testsuite/ld-x86-64/pr22929.s: Likewise.
For absolute symbols which are forced local or not dynamic, the ABS relocation
should be resolved at static linking time.
Originally, an RELATIVE/ABS relocation will be generated even for absolution
symbols for the dynamic linker to resolve.
bfd/
2018-03-07 Renlin Li <renlin.li@arm.com>
PR ld/20402
* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Check absolute symbol,
and don't emit relocation in specific case.
ld/
2018-03-07 Renlin Li <renlin.li@arm.com>
PR ld/20402
* testsuite/ld-aarch64/aarch64-elf.exp: Run new test.
* testsuite/ld-aarch64/pr20402.s: New.
* testsuite/ld-aarch64/pr20402.d: New.
Currently, when `mips_elf_calculate_relocation' is asked to relocate an
undefined symbol, it reports an error or a warning and immediately
returns without performing the relocation. This is fine if the link
fails, but if unresolved_syms_in_objects == RM_GENERATE_WARNING, the
link will continue and output some unrelocated code, which is a
regression from commit e7e2196da3 ("MIPS/BFD: Correctly report
undefined relocations").
Fix this by continuing after calling the `undefined_symbol' hook unless
this is an error condition.
bfd/
PR ld/21900
* elfxx-mips.c (mips_elf_calculate_relocation): Only return
after calling `undefined_symbol' hook if this is an error
condition. Assume the value of 0 for the symbol requested
otherwise.
ld/
PR ld/21900
* testsuite/ld-mips-elf/undefined-warn.d: New test.
* testsuite/ld-mips-elf/undefined.s: Add padding at the end.
* testsuite/ld-mips-elf/mips-elf.exp: Run the new test.
More standarization of error/warning messages. The ARM backend has
some multi-line error messages, which don't fit particularly well with
the GNU coding standard insistence that error messages shouldn't be
capitalized or have a full-stop. I've replaced the line breaks with
semicolons.
So for instance the following
system/path/to/ld: myobject.o: invalid special symbol `foo'.
system/path/to/ld: It must be a global or weak function symbol.
becomes
system/path/to/ld: myobject.o: invalid special symbol `foo'; it must be a global or weak function symbol
bfd/
* elf32-arm.c, * elfnn-aarch64.c: Standardize error/warning messages.
ld/
* testsuite/ld-aarch64/reloc-overflow-bad.d,
* testsuite/ld-arm/attr-merge-9.out,
* testsuite/ld-arm/attr-merge-arch-2.d,
* testsuite/ld-arm/attr-merge-unknown-1.d,
* testsuite/ld-arm/attr-merge-unknown-2.d,
* testsuite/ld-arm/attr-merge-unknown-2r.d,
* testsuite/ld-arm/attr-merge-unknown-3.d,
* testsuite/ld-arm/cmse-implib-errors.out,
* testsuite/ld-arm/cmse-new-earlier-later-implib.out,
* testsuite/ld-arm/cmse-new-implib-no-output.out,
* testsuite/ld-arm/cmse-new-implib-not-sg-in-implib.out,
* testsuite/ld-arm/cmse-new-implib.out,
* testsuite/ld-arm/cmse-new-wrong-implib.out,
* testsuite/ld-arm/cmse-veneers-no-gnu_sgstubs.out,
* testsuite/ld-arm/cmse-veneers-wrong-entryfct.out,
* testsuite/ld-arm/group-relocs-alu-bad-2.d,
* testsuite/ld-arm/group-relocs-alu-bad.d,
* testsuite/ld-arm/group-relocs-ldc-bad-2.d,
* testsuite/ld-arm/group-relocs-ldc-bad.d,
* testsuite/ld-arm/group-relocs-ldr-bad-2.d,
* testsuite/ld-arm/group-relocs-ldr-bad.d,
* testsuite/ld-arm/group-relocs-ldrs-bad-2.d,
* testsuite/ld-arm/group-relocs-ldrs-bad.d,
* testsuite/ld-arm/stm32l4xx-cannot-fix-far-ldm.d: Update.
The GNU coding standard says error messages should be of the form
program:sourcefile:lineno: message
or
program: message
and
"The string message should not begin with a capital letter when it
follows a program name and/or file name, because that isn’t the
beginning of a sentence. (The sentence conceptually starts at the
beginning of the line.) Also, it should not end with a period."
This patch does that for ppc, and removes some British spelling.
I've also switched some error output from using the linker callback
einfo to _bfd_error_handler, due to improved compilation time
argument checking now done for the latter function.
bfd/
* elf32-ppc.c: Standardize error/warning messages. Use
_bfd_error_handler rather than einfo when einfo features not used.
* elf64-ppc.c: Likewise.
ld/
* testsuite/ld-powerpc/attr-gnu-12-21.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-12.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-13.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-21.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-23.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-31.d: Update.
* testsuite/ld-powerpc/attr-gnu-4-32.d: Update.
* testsuite/ld-powerpc/attr-gnu-8-23.d: Update.
Use the SEC_FIXED_SIZE flag to actually fix the size of `.reginfo' and
`.MIPS.abiflags' sections in `_bfd_mips_elf_always_size_sections', as
originally intended, removing link failures such as:
ld: final link failed: Section has no contents
or:
ld: final link failed: Bad value
or:
ld: foo: .reginfo section size should be 24 bytes, actual size is 32
and assertion failures like:
ld: BFD (GNU Binutils) 2.30.51.20180131 assertion fail .../bfd/elfxx-mips.c:14322
in link scenarios involving a linker script that either creates an
output `.reginfo' or `.MIPS.abiflags' section from scratch or produces
either section from different sections. If such an output section's
size turns out to be incorrect according to the psABI, then the section
is either truncated or padded out to the correct size, as relevant.
This allows people to handle these sections in a link in an unusual way,
while still addressing the issue covered by commit 58807c48a5
("_bfd_mips_elf_final_link: Notify user about wrong .reginfo size").
The original arrangement, coming from an unindentified change made to
what was called `mips_elf_always_size_sections' back then, between
commit 02650bd0a9 ("This adds ABI flags to MIPS/ELF object files.")
and commit 252b5132c7 ("19990502 sourceware import"), also missing
from BFD ChangeLog files, assumed that the output section size is not
going to change after return from `bfd_elf_size_dynamic_sections', the
caller of that function, called in turn from `ldemul_before_allocation'
via `gld${EMULATION_NAME}_before_allocation' in ld/emultempl/elf32.em,
and ultimately from `lang_process'. This is because later on in
`lang_process' processing `lang_size_sections' is called , happily
recalculating the section size, and it has actually already been the
case at the time of commit 252b5132c7 ("19990502 sourceware import"),
so the assumption was clearly incorrect right from the beginning.
bfd/
* elfxx-mips.c (_bfd_mips_elf_always_size_sections): Set
SEC_FIXED_SIZE and SEC_HAS_CONTENTS flags for `.reginfo' and
`.MIPS.abiflags' sections.
(_bfd_mips_elf_final_link): Avoid reading beyond `.reginfo'
section's end.
ld/
* testsuite/ld-mips-elf/reginfo-0.d: New test.
* testsuite/ld-mips-elf/reginfo-0r.d: New test.
* testsuite/ld-mips-elf/reginfo-1.d: New test.
* testsuite/ld-mips-elf/reginfo-1r.d: New test.
* testsuite/ld-mips-elf/reginfo-2.d: New test.
* testsuite/ld-mips-elf/reginfo-2r.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-0.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-0r.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-1.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-1r.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-2.d: New test.
* testsuite/ld-mips-elf/mips-abiflags-2r.d: New test.
* testsuite/ld-mips-elf/reginfo-0.ld: New test linker script.
* testsuite/ld-mips-elf/reginfo-1.ld: New test linker script.
* testsuite/ld-mips-elf/mips-abiflags-0.ld: New test linker
script.
* testsuite/ld-mips-elf/mips-abiflags-1.ld: New test linker
script.
* testsuite/ld-mips-elf/reginfo-1.s: New test source.
* testsuite/ld-mips-elf/reginfo-2.s: New test source.
* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.
ld-elf/ehdr_start fails with -z separate-code. Since there is no data
LOAD segment before code LOAD segment:
There are 2 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x200000 0x0000000000600000 0x0000000000600000 0x000010 0x000010 R E 0x200000
LOAD 0x400000 0x0000000000800000 0x0000000000800000 0x000008 0x000008 R 0x200000
Section to Segment mapping:
Segment Sections...
00 .text
01 .rodata
the program header isn't included in any LOAD segment. As the result,
reference to __ehdr_start is resolved to zero. Pass --build-id to ld
to add a data LOAD segment before code LOAD segment to put the program
header in the data LOAD segment.
PR ld/22845
* testsuite/ld-elf/ehdr_start.d: Pass --build-id to ld.
-z separate-code creates separate code LOAD segment, aligns it to the
maximum page size and places .plt section before .text section. But
ld-elf/eh4 passes -Ttext 0x400 to linker to place .text section at
address 0x400, which is impossible for linker to accomplish:
$ ld -shared -Ttext 0x400 -z separate-code -o x.so eh4.o
ld: section .eh_frame LMA [0000000000200000,000000000020006b] overlaps section .plt LMA [0000000000200000,000000000020001f]
Since ld-elf/eh4 also checks exact addresses, this patch passes
-z max-page-size=0x200000 -z noseparate-code to ld.
PR ld/22845
* ld-elf/eh4.d: Pass -z max-page-size=0x200000 -z noseparate-code
to ld.
"-z separate-code" generates different addresses. Update these tests
to accept any addresses.
* testsuite/ld-x86-64/bnd-ifunc-1.d: Updated.
* testsuite/ld-x86-64/ilp32-4.d: Likewise.
Add -z noseparate-code -z max-page-size=0x200000 since these tests
check for exact addresses and don't expect extra PT_LOAD segment. But
don't add them to nacl targets since they generate different addresses.
* testsuite/ld-x86-64/x86-64.exp: Add -z noseparate-code
-z max-page-size=0x200000, excluding NaCl target.
Alan Modra
Maciej W. Rozycki
Renlin Li
Eric Botcazou
H.J. Lu
Roland McGrath
Nick Clifton
Jim Wilson
James Cowgill