A recent BFD change caused a build failure for a Windows->PPC cross:
ld.exe: ../bfd/libbfd.a(coff-rs6000.o):coff-rs6000.c:(.text+0x4571): undefined reference to `getuid'
ld.exe: ../bfd/libbfd.a(coff-rs6000.o):coff-rs6000.c:(.text+0x457e): undefined reference to `getgid'
This patch fixes the problem by moving the replacement definitions of
getuid and getgid to system.h.
bfd/ChangeLog
2020-11-11 Tom Tromey <tromey@adacore.com>
* archive.c (getuid, getgid): Move...
* sysdep.h (getuid, getgid): ...here.
This patch fixes fails adding library dependencies for xcoff, and
improves the error message should stat fail for an archive member.
"tmpdir/artest.a: File not found" is plainly wrong.
Fixes these fails:
powerpc-aix5.1 +FAIL: ar adding library dependencies
powerpc-aix5.2 +FAIL: ar adding library dependencies
rs6000-aix4.3.3 +FAIL: ar adding library dependencies
rs6000-aix5.1 +FAIL: ar adding library dependencies
rs6000-aix5.2 +FAIL: ar adding library dependencies
* archive.c (bfd_ar_hdr_from_filesystem): Use bfd_set_input_error
when stat of archive member fails.
* coff-rs6000.c (xcoff_write_archive_contents_old),
(xcoff_write_archive_contents_big): Likewise, and handle in-memory
bfd.
This patch reverts most of git commit 1e3b96fd6c, so IR symbols are
again not marked def_regular or ref_regular. That should be enough to
stop IR symbols from becoming dynamic. To mark as-needed shared
libraries referenced by IR symbols, use the referencing BFD rather
than the ref flags.
bfd/
PR 15146
PR 26314
PR 26530
PR 26806
* elflink.c (elf_link_add_object_symbols): Don't set def/ref flags
for plugin syms. Do allow plugin syms to mark as-needed libs.
ld/
PR 26806
* testsuite/ld-plugin/lto-19.h,
* testsuite/ld-plugin/lto-19a.c,
* testsuite/ld-plugin/lto-19b.c,
* testsuite/ld-plugin/lto-19c.c: New test.
* testsuite/ld-plugin/pr26806.c,
* testsuite/ld-plugin/pr26806.d: New test.
* testsuite/ld-plugin/lto.exp: Run them.
PR 26809
* elf.c (_bfd_elf_slurp_secondary_reloc_section): Use the correct
sized reloc reading function.
(_bfd_elf_write_secondary_reloc_section): Use the correct sized
reloc writing function.
* elf64-hppa.c (elf_hppa_final_link_relocate): Check that the
symbol's section is being output before adding its offset to the
addend when processing R_PARISC_SECREL32.
bfd * po/es.po: Fix printf format
binutils * windmc.c: Fix printf format
gas * config/tc-arc.c: Fix printf format
opcodes * po/es.po: Fix printf format
sim * arm/armos.c: Fix printf format
* ppc/emul_netbsd.c: Fix printf format
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
For the ifunc symbol, which is referenced by GOT rather than PLT relocs,
we should add the dynamic reloc (usually IRELATIVE) into the .rel.iplt
when generating the static executable. But if we use riscv_elf_append_rela
to add the dynamic relocs into .rela.iplt, this may cause the overwrite
problem.
The reason is that we don't handle the `reloc_index` of .rela.iplt, but
the riscv_elf_append_rela adds the relocs to the place that are calculated
from the reloc_index (in seqential). Therefore, we may overwrite the
dynamic relocs when the `reloc_index` of .rela.iplt isn't handled correctly.
One solution is that we can add these dynamic relocs (GOT ifunc) from
the last of .rela.iplt section. But I'm not sure if it is the best way.
bfd/
* elfnn-riscv.c (riscv_elf_link_hash_table): Add last_iplt_index.
(riscv_elf_size_dynamic_sections): Initialize the last_iplt_index.
(riscv_elf_relocate_section): Use riscv_elf_append_rela.
(riscv_elf_finish_dynamic_symbol): If the use_elf_append_rela is
false, then we should add the dynamic relocs from the last of
the .rela.iplt, and don't use the riscv_elf_append_rela to add.
ld/
* testsuite/ld-riscv-elf/ifunc-plt-got-overwrite.s: New testcase.
* testsuite/ld-riscv-elf/ifunc-plt-got-overwrite.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-got-overwrite-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-got-overwrite-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-got-overwrite-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
Generally, glibc dynamic linker should have two ways to deal with ifunc
- one is to handle the IRELATIVE relocations for the non-preemtive ifunc
symbols, the other is to handle the R_RISCV_32/64 and R_RISCV_JUMP_SLOT
relocations with the STT_IFUNC preemtive symbols. No matter which method
is used, both of them should get the resolved ifunc symbols at runtime.
Therefore, linker needs to generate the correct dynamic relocations for
ifunc to make sure the the dynamic linker works well. For now, there are
thirteen relocations are supported for ifunc in GNU ld,
* R_RISCV_CALL and R_RISCV_CALL_PLT:
The RISC-V compiler won't generate R_RISCV_JAL directly to jump to an
ifunc. Besides, we disable the relaxations for the relocation referenced
to ifunc, so just handling the R_RISCV_CALL and R_RISCV_CALL_PLT should be
enough. Linker should generate a .plt entry and a .got.plt entry for it,
and also needs to insert a dynamic IRELATIVE in the .got.plt enrty, or
insert a R_RISCV_JUMP_SLOT when generating shared library.
* R_RISCV_PCREL_HI20 and R_RISCV_PCREL_LO12_I/S:
LA/LLA pattern with local fPIC ifunc symbol, or any non-PIC ifunc symbol.
The PC-relative relocation. The current linker will deal with them in
the same way as R_RISCV_CALL_PLT.
* R_RISCV_GOT_HI20 and R_RISCV_PCREL_LO12_I/S:
LA pattern with global PIC ifunc symbol. Linker should insert a dynamic
IRELATIVE in the .got entry, or insert a R_RISCV_32/64 when generating
shared library.
* R_RISCV_32 and R_RISCV_64:
Store the ifunc symbol into the data section. Linker should insert a
dynamic IRELATIVE in the data section, or insert a R_RISCV_32/64 when
generating shared library.
* R_RISCV_HI20 and R_RISCV_LO12_I/S:
The LUI + ADDI/LW/SW patterns. The absolute access relocation. The
medlow model without the -fPIC compiler option should generate them.
The ld ifunc testsuites "Build pr23169a" and "Build pr23169d" need the
relocations, they are in the ld/testsuite/ld-ifunc/, and need compiler
support.
However, we also made some optimizations with reference to x86,
* If GOT and PLT relocations refer to the same ifunc symbol when generating
pie, then they can actually share a .got entry without creating two entries
to store the same value and relocation.
* If GOT, PLT and DATA relocations refer to the same ifunc symbol when
generating position dependency executable, then linker will fill the address
of .plt entry into the corresponding .got entry and data section, without
insert any dynamic relocations for the GOT and DATA relocations.
For the ifunc testcases, there are three types of them,
1. ifunc-reloc-*: Only check the single type of relocation refers to
ifunc symbol.
* ifunc-reloc-call: R_RISCV_CALL and R_RISCV_CALL_PLT.
* ifunc-reloc-data: R_RISCV_32 and R_RISCV_64.
* ifunc-reloc-got: R_RISCV_GOT_HI20 and R_RISCV_PCREL_LO_I/S.
* ifunc-reloc-pcrel: R_RISCV_PCREL_HI20 and R_RISCV_PCREL_LO_I/S.
2. ifunc-[nonplt|plt]-*: If we don't have PLT relocs, then don't need to
create the PLT and it's .plt entries.
* ifunc-nonplt: Combine R_RISCV_GOT_HI20 and R_RISCV_32/64.
* ifunc-plt: Combine all ifunc relocations.
3. ifunc-seperate-*: If we link the ifunc caller and resolver into the
same module (link the objects), then the results are the same as the
ifunc-reloc-* and ifunc-[noplt|plt]-* testcases. Consider the cases that
the ifunc callers and resolver are in the different modules, that is, we
compile the ifunc resolver to the shared library first, and then link it
with the ifunc callers. The output of ifunc callers should be the same as
the normal STT_FUNC cases, and the shared ifunc resolver should define the
symbols as STT_IFUNC.
The R_RISCV_PCREL_HI20 reloc is special. It should be linked and resolved
locally, so if the ifunc resolver is defined in other modules (other shared
libraries), then the R_RISCV_PCREL_HI20 is unresolvable, and linker should
issue an unresolvable reloc error.
bfd/
* elfnn-riscv.c: Include "objalloc.h" since we need objalloc_alloc.
(riscv_elf_link_hash_table): Add loc_hash_table and loc_hash_memory
for local STT_GNU_IFUNC symbols.
(riscv_elf_got_plt_val): Removed.
(riscv_elf_local_htab_hash, riscv_elf_local_htab_eq): New functions.
Use to compare local hash entries.
(riscv_elf_get_local_sym_hash): New function. Find a hash entry for
local symbol, and create a new one if needed.
(riscv_elf_link_hash_table_free): New function. Destroy an riscv
elf linker hash table.
(riscv_elf_link_hash_table_create): Create hash table for local ifunc.
(riscv_elf_check_relocs): Create a fake global symbol to track the
local ifunc symbol. Add support to check and handle the relocations
reference to ifunc symbols.
(allocate_dynrelocs): Let allocate_ifunc_dynrelocs and
allocate_local_ifunc_dynrelocs to handle the ifunc symbols if they
are defined and referenced in a non-shared object.
(allocate_ifunc_dynrelocs): New function. Allocate space in .plt,
.got and associated reloc sections for ifunc dynamic relocs.
(allocate_local_ifunc_dynrelocs): Likewise, but for local ifunc
dynamic relocs.
(riscv_elf_relocate_section): Add support to handle the relocation
referenced to ifunc symbols.
(riscv_elf_size_dynamic_sections): Updated.
(riscv_elf_adjust_dynamic_symbol): Updated.
(riscv_elf_finish_dynamic_symbol): Finish up the ifunc handling,
including fill the PLT and GOT entries for ifunc symbols.
(riscv_elf_finish_local_dynamic_symbol): New function. Called by
riscv_elf_finish_dynamic_symbol to handle the local ifunc symbols.
(_bfd_riscv_relax_section): Don't do the relaxation for ifunc.
* elfxx-riscv.c: Add R_RISCV_IRELATIVE.
* configure.ac: Link elf-ifunc.lo to use the generic ifunc support.
* configure: Regenerated.
include/
* elf/riscv.h: Add R_RISCV_IRELATIVE to 58.
ld/
* emulparams/elf32lriscv-defs.sh: Add IREL_IN_PLT.
* testsuite/ld-ifunc/ifunc.exp: Enable ifunc tests for RISC-V.
* testsuite/ld-riscv-elf/ld-riscv-elf.exp (run_dump_test_ifunc):
New dump test for ifunc. There are two arguments, 'target` and
`output`. The `target` is rv32 or rv64, and the `output` is used
to choose which output you want to test (exe, pie or .so).
* testsuite/ld-riscv-elf/ifunc-reloc-call-01.s: New testcase.
* testsuite/ld-riscv-elf/ifunc-reloc-call-01.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-01-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-01-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-01-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-02.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-02.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-02-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-02-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-call-02-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-data.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-data.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-data-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-data-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-data-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-got.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-got.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-got-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-got-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-got-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-pcrel.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-pcrel.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-pcrel-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-pcrel-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-reloc-pcrel-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-nonplt.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-nonplt.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-nonplt-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-nonplt-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-nonplt-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-01.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-01.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-01-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-01-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-01-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-02.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-02.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-02-exe.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-02-pic.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-plt-02-pie.rd: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-resolver.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-caller.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-exe.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-pic.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-pie.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-caller-pcrel.s: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-pcrel-pic.d: Likewise.
* testsuite/ld-riscv-elf/ifunc-seperate-pcrel-pie.d: Likewise.
Casts should be avoided if at all possible, and in particular the C
standard doesn't promise that function pointers can be cast to void*
or vice-versa. It is only mentioned under J.5 Common extensions,
saying "The following extensions are widely used in many systems, but
are not portable to all implementations."
* elf32-arc.c (replace_func): Correct return type.
(get_replace_function): Use a replace_func function pointer rather
than void*. Update associated ARC_RELOC_HOWTO define.
Prompted by two occurrences of -Wmisleading-indentation warnings.
* elf32-cr16.c: Formatting.
(cr16_elf_final_link_relocate): Sign extend rather than clumsy
"add or subtract" of offset value. Simplify range checks. Move
common code out of "if" branches. Don't refetch insn fields
needlessly.
The previous sanity check allowed a ld on the HA reloc and addis
on the LO_DS.
* elf64-ppc.c (ppc64_elf_relocate_section): Tighten sanity check
on R_PPC64_GOT_LO_DS and R_PPC64_GOT_HA instructions.
