The extension version checking logic is really just too complicated to
encode into the linker, trying to do so causes more harm than good.
This removes the checks and the associated tests, leaving the logic to
keep the largest version of each extension linked into the target.

bfd/

	* elfnn-riscv.c (riscv_version_mismatch): Rename to
	riscv_update_subset_version, and stop reporting warnings on
	version mismatches.
	(riscv_merge_std_ext): Adjust calls to riscv_version_mismatch.
	(riscv_merge_multi_letter_ext): Likewise.

ld/
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-01.d: Remove
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-01a.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-01b.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-02.d: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-02a.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-02b.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-02c.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-arch-failed-02d.s: Likewise
	* testsuite/ld-riscv-elf/attr-merge-user-ext-01.d: New test.
	* testsuite/ld-riscv-elf/attr-merge-user-ext-rv32i21_m2p0.s:
	Likewise.
	* testsuite/ld-riscv-elf/attr-merge-user-ext-rv32i21_m2p1.s:
	Likewise.
	* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Remove obselete
	attr-merge-arch-failed-{01,02}, replace with
	attr-merge-user-ext-01.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

GOT32 relocations are allowed since absolute value + addend is stored in
the GOT slot.

Tested on glibc 2.35 build with GCC 11.2 and -Os.

bfd/

	PR ld/28870
	* elfxx-x86.c (_bfd_elf_x86_valid_reloc_p): Also allow GOT32
	relocations.

ld/

	PR ld/28870
	* testsuite/ld-i386/i386.exp: Run pr28870.
	* testsuite/ld-i386/pr28870.d: New file.
	* testsuite/ld-i386/pr28870.s: Likewise.

(cherry picked from commit 30a954525f4e53a9cd50a1a8a6f201c7cf6595c7)

This reverts commit 2f83249c.

	PR ld/28743
	* ldlang.c (lang_size_relro_segment_1): Revert 2022-01-10 changes.
	* testsuite/ld-i386/pr20830.d: Likewise.
	* testsuite/ld-s390/gotreloc_64-relro-1.dd: Likewise.
	* testsuite/ld-x86-64/pr14207.d: Likewise.
	* testsuite/ld-x86-64/pr18176.d: Likewise.
	* testsuite/ld-x86-64/pr20830a-now.d: Likewise.
	* testsuite/ld-x86-64/pr20830a.d: Likewise.
	* testsuite/ld-x86-64/pr20830b-now.d: Likewise.
	* testsuite/ld-x86-64/pr20830b.d: Likewise.
	* testsuite/ld-x86-64/pr21038a-now.d: Likewise.
	* testsuite/ld-x86-64/pr21038a.d: Likewise.
	* testsuite/ld-x86-64/pr21038b-now.d: Likewise.
	* testsuite/ld-x86-64/pr21038c-now.d: Likewise.
	* testsuite/ld-x86-64/pr21038c.d: Likewise.

This reverts commit 8b7c6a1f.

	PR ld/28743
	PR ld/28819
	* ldlang.c (lang_size_relro_segment_1): Revert 2022-01-14 change.
	testsuite/ld-x86-64/pr28743-1.d: Likewise.
	testsuite/ld-x86-64/pr28743-1.s: Likewise.
	testsuite/ld-x86-64/x86-64.exp: Likewise.

Don't abort for undefined symbol when finishing DT_RELR.  Instead, skip
undefined symbol.  Undefined symbol will be reported by relocate_section.

	* elfxx-x86.c (elf_x86_size_or_finish_relative_reloc): Skip
	undefined symbol in finishing phase.

(cherry picked from commit a9e61227c09c03d5cb54f9c88520baffc1d86c86)

This testcase triggers a stub sizing error with the patches applied
for PR28743 (commit 2f83249c and c804c6f98d34).

	PR 28827
	* testsuite/ld-powerpc/pr28827-1.s,
	* testsuite/ld-powerpc/pr28827-1.d: New test.
	* testsuite/ld-powerpc/powerpc.exp: Run it.

(cherry picked from commit 9810db10f726f47c8e878ca4b0b4b4f5e9c16a5d)
(cherry picked from commit 0acf434a23768449cbb4b3732355f3f2febecaee)

binutils/
	* testsuite/lib/binutils-common.exp (run_dump_test): Reference
	global SIZE and SIZEFLAGS.
ld/
	* testsuite/config/default.exp: Define SIZE and SIZEFLAGS.

(cherry picked from commit cd8adbf3017272877c7e196e2e326f888f207bd9)

Current code detects the need for PT_GNU_EH_FRAME using a field set by
_bfd_elf_discard_section_eh_frame_hdr, which is called fairly late in
the linking process.  Use the elf hash table eh_info instead, which is
set up earlier by size_dynamic_sections.

	* elf-bfd.h (struct output_elf_obj_tdata): Delete eh_frame_hdr.
	(elf_eh_frame_hdr): Don't define.
	(_bfd_elf_discard_section_eh_frame_hdr): Update prototype.
	* elf-eh-frame.c (_bfd_elf_discard_section_eh_frame_hdr): Delete
	abfd parameter.  Don't set elf_eh_frame_hdr.
	* elf.c (elf_eh_frame_hdr): New function.
	(get_program_header_size): Adjust elf_eh_frame_hdr call.
	(_bfd_elf_map_sections_to_segments): Likewise.

(cherry picked from commit 8df52eeeb06efcccd6b840689ad8e11ebb264e7f)

Supporting -static-pie on PowerPC64 requires the linker to properly
treat SHN_ABS symbols for cases like glibc's _nl_current_LC_CTYPE_used
absolute symbol.  I've been slow to fix the linker on powerpc because
there is some chance that this will break some shared libraries or
PIEs.

bfd/
	* elf64-ppc.c (ppc64_elf_check_relocs): Consolidate local sym
	handling code.  Don't count dyn relocs against non-dynamic
	absolute symbols.
	(dec_dynrel_count): Adjust to suit.
	(ppc64_elf_edit_toc): Don't remove entries for absolute symbols
	when pic.
	(allocate_got): Don't allocate space for got relocs against
	non-dynamic absolute syms.
	(ppc64_elf_layout_multitoc): Likewise.
	(got_and_plt_relr): Likewise.
	(ppc64_elf_size_dynamic_sections): Likewise for local got.
	(got_and_plt_relr_for_local_syms): Likewise.
	(ppc64_elf_size_stubs): Don't allocate space for relr either.
	(ppc64_elf_relocate_section): Don't write relocs against non-dynamic
	absolute symbols.  Don't optimise got and toc code sequences
	loading absolute symbol entries.
ld/
	* testsuite/ld-powerpc/abs-reloc.s,
	* testsuite/ld-powerpc/abs-static.d,
	* testsuite/ld-powerpc/abs-static.r,
	* testsuite/ld-powerpc/abs-pie.d,
	* testsuite/ld-powerpc/abs-pie.r,
	* testsuite/ld-powerpc/abs-shared.d,
	* testsuite/ld-powerpc/abs-shared.r,
	* testsuite/ld-powerpc/abs-pie-relr.d,
	* testsuite/ld-powerpc/abs-pie-relr.r,
	* testsuite/ld-powerpc/abs-shared-relr.d,
	* testsuite/ld-powerpc/abs-shared-relr.r: New tests.
	* testsuite/ld-powerpc/powerpc.exp: Run them.

(cherry picked from commit 3a3a4c1fe4ccb1914d29fbf8f5930d55aacec78f)

The assertion is this one in ppc_build_one_stub
  BFD_ASSERT (stub_entry->stub_offset >= stub_entry->group->stub_sec->size);
It is checking that a stub doesn't overwrite the tail of a previous
stub, so not something trivial.

Normally, stub sizing iterates until no stubs are added, detected by
no change in stub section size.  Iteration also continues if no stubs
are added but one or more stubs increases in size, which also can be
detected by a change in stub section size.  But there is a
pathological case where stub section sizing decreases one iteration
then increases the next.  To handle that situation, stub sizing also
stops at more than STUB_SHRINK_ITER (20) iterations when calculated
stub section size is smaller.  The previous larger size is kept for
the actual layout (so that building the stubs, which behaves like
another iteration of stub sizing, will see the stub section sizes
shrink).  The problem with that stopping condition is that it assumes
that stub sizing is only affected by addresses external to the stub
sections, which isn't always true.

This patch fixes that by also keeping larger individual stub_offset
addresses past STUB_SHRINK_ITER.  It also catches a further
pathological case where one stub shrinks and another expands in such a
way that no stub section size change is seen.

	PR 28827
	* elf64-ppc.c (struct ppc_link_hash_table): Add stub_changed.
	(STUB_SHRINK_ITER): Move earlier in file.
	(ppc_size_one_stub): Detect any change in stub_offset.  Keep
	larger one if past STUB_SHRINK_ITER.
	(ppc64_elf_size_stubs): Iterate on stub_changed too.

(cherry picked from commit 0441f94fba61998b4bd18487aacf70a672df099c)

Re: PR28827, assertion building LLVM 9 on powerpc64le-linux-gnu

The previous patch wasn't quite correct.  The size and padding depends
on offset used in the current iteration, and if we're fudging the
offset past STUB_SHRINK_ITER then we'd better use that offset.  We
can't have plt_stub_pad using stub_sec->size as the offset.

	PR 28827
	* elf64-ppc.c (plt_stub_pad): Add stub_off param.
	(ppc_size_one_stub): Set up stub_offset to value used in this
	iteration before sizing the stub.  Adjust plt_stub_pad calls.

(cherry picked from commit 2405fc4016feadea33cb747d5654514f62b74ff4)

Re: PR28827, assertion building LLVM 9 on powerpc64le-linux-gnu

In trying to find a testcase for PR28827, I managed to hit a linker
error in bfd_set_section_contents with a .branch_lt input section
being too large for the output .branch_lt.

bfd/
	PR 28827
	* elf64-ppc.c (ppc64_elf_size_stubs): Set section size to
	maxsize past STUB_SHRINK_ITER before laying out.  Remove now
	unnecessary conditional setting of maxsize at start of loop.
ld/
	* testsuite/ld-powerpc/pr28827-2.d,
	* testsuite/ld-powerpc/pr28827-2.lnk,
	* testsuite/ld-powerpc/pr28827-2.s: New test.
	* testsuite/ld-powerpc/powerpc.exp: Run it.

(cherry picked from commit 9ff8aa7d418bc508dbd429576b93e30ed9dc5891)

Using a symbol other than .TOC. with @tocbase is an extension to the
ABI.  It is never valid to use a symbol without a definition in the
binary, and symbols on these expressions cannot be overridden.  Make
this explicit by using ".hidden" in the testcase.

	* testsuite/ld-powerpc/symtocbase-1.s: Align data.  Make function
	entry symbol hidden.
	* testsuite/ld-powerpc/symtocbase-2.s: Likewise.
	* testsuite/ld-powerpc/symtocbase.d: Adjust expected output.

(cherry picked from commit ef5684c2bdf4d4f9975650e3b7b8f9b0ff98abee)

From: Peilin Ye <peilin.ye@bytedance.com>
objcopy's --only-keep-debug option has been broken for ELF files since
commit 8c803a2d.

  1. binutils/objcopy.c:setup_section() marks non-debug sections as
     SHT_NOBITS, then calls bfd_copy_private_section_data();
  2. If ISEC and OSEC share the same section flags,
     bfd/elf.c:_bfd_elf_init_private_section_data() restores OSEC's
     section type back to ISEC's section type, effectively undoing
     "make_nobits".

	* objcopy.c (setup_section): Act on make_nobits after calling
	bfd_copy_private_section_data.

(cherry picked from commit 7c4643efe7befea8e5063e8b56c0400fd8cee2d5)

Fallout from commit e86fc4a5

	PR 28826
	* coffgen.c (coff_write_alien_symbol): Init dummy to zeros.

(cherry picked from commit 07c9f243b3a12cc6749bc02ee7b165859979348b)

	PR 28753
	* rddbg.c (read_section_stabs_debugging_info): Don't read past
	end of section when concatentating stab strings.

(cherry picked from commit 085b299b71721e15f5c5c5344dc3e4e4536dadba)

Add R_X86_64_GOT32, R_X86_64_GOT64, R_X86_64_GOTPCREL64 and
R_X86_64_GOTPLT64 to X86_64_GOT_TYPE_P to cover more GOT relocations.

	PR ld/28858
	* elfxx-x86.h (X86_64_GOT_TYPE_P): Add R_X86_64_GOT32,
	R_X86_64_GOT64, R_X86_64_GOTPCREL64 and R_X86_64_GOTPLT64.

(cherry picked from commit 8d26ee1cd166b8565df17c82e7ecc9d35b5a367f)

	PR 28834
	* dwarf2.c (read_section): Change the heuristic that checks for
	overlarge dwarf debug info sections.

	PR 98886
	PR 99935
	* rust-demangle.c (struct rust_demangler): Add a recursion
	counter.
	(demangle_path): Increment/decrement the recursion counter upon
	entry and exit.  Fail if the counter exceeds a fixed limit.
	(demangle_type): Likewise.
	(rust_demangle_callback): Initialise the recursion counter,
	disabling if requested by the option flags.

1. Compute the desired PT_GNU_RELRO segment base and find the maximum
section alignment of sections starting from the PT_GNU_RELRO segment.
2. Find the first preceding load section.
3. Don't add the 1-page gap between the first preceding load section and
the relro segment if the maximum page size >= the maximum section
alignment.  Align the PT_GNU_RELRO segment first.  Subtract the maximum
page size if therer is still a 1-page gap.

	PR ld/28743
	PR ld/28819
	* ldlang.c (lang_size_relro_segment_1): Rewrite.
	* testsuite/ld-x86-64/pr28743-1.d: New file.
	* testsuite/ld-x86-64/pr28743-1.s: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run pr28743-1.

(cherry picked from commit c804c6f98d342c3d46f73d7a7ec6229d5ab1c9f3)

	PR 28816
	* elf/common.h (AT_SUN_HWCAP): Make definition conditional.

	PR 28779
	* regex.c: Suppress -Wuse-after-free.