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Absolute address symbols cannot be used with -shared.
We output more information to the user than just BFD_ASSETR.
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When scanning relocations and determining whether TLS type transition is
possible, it will try to obtain the symbol got type. If the symbol got
type record has not yet been allocated space and initialized, it will
cause ld to crash. So when uninitialized, the symbol is set to GOT_UNKNOWN.
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PR ld/31652
* elf-vxworks.c (elf_vxworks_emit_relocs): Drop duplicate word.
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Using want_p_paddr_set_to_zero in commit 45d92439aebd was wrong. Even
solaris targets don't have want_p_paddr_set_to_zero, but we should
handle them at least somewhat reasonably.
PR 31667
* elf.c (IS_SECTION_IN_INPUT_SEGMENT): Remove bed arg, add
paddr_valid. Don't use bed->want_p_paddr_set_to_zero.
(INCLUDE_SECTION_IN_SEGMENT): Likewise.
(rewrite_elf_program_header): Adjust to suit.
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The reason behind this patch was noticing that generic ELF targets
fail to remove "bar" in the recently committed ld-elf/undefweak-1
test. (Despite that, those targets pass the test due to it being too
strict when matching symbols. "bar" gets turned into a local weak
defined absolute symbol.)
swap_out_syms currently drops local section syms that are defined in
discarded sections. Extend that to also drop other symbols in
discarded sections too, even global symbols. The linker goes to quite
a lot of effort to ensure globals in discarded section take a
definition from the kept linkonce or comdat group section. So the
global sym change should only affect cases where something is quite
wrong about the set of linkonce or comdat group sections. However
that change to elf_map_symbols meant we dropped _DYNAMIC_LINK /
_DYNAMIC_LINKING for mips, a global absolute symbol given STT_SECTION
type for some reason. That problem is fixed by reverting the pr14493
change which is no longer needed due to a) BSF_SECTION_SYM_USED on
x86, and b) fixing objcopy to use copy_private_symbol_data.
bfd/
PR 14493
* elf.c (ignore_sym): Rename from ignore_section_sym. Return
true for any symbol without a section or in a discarded section.
Revert pr14493 change.
(elf_map_symbols): Tidy. Use ignore_sym on all symbols.
(swap_out_syms): Tidy.
ld/
* testsuite/ld-elf/undefweak-1.rd: Match any "bar".
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bfd_copy_private_symbol_data is a bfd function that appeared in
commit 89665c8562da a long time ago, but seemingly wasn't used
anywhere until Jan added it to gas/symbols.c in commit 6a2b6326c21e.
The function is used to modify ELF symbol st_shndx for symbols defined
in odd sections like .symtab, so that they get the corresponding
section st_shndx in an output file. This patch fixes some bitrot in
the function. After commit c03551323c04 which introduced
output_elf_obj_tdata, elf_strtab_sec and elf_shstrtab_sec will
segfault if used on an input bfd.
PR 14493
* elf.c (_bfd_elf_copy_private_symbol_data): Don't use
elf_strtab_sec and elf_shstrtab_sec.
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PR ld/31652
* elflink.c (_bfd_elf_link_output_relocs): Don't segfault
on NULL rel_hash.
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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.
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* dwarf2.c (_bfd_dwarf2_cleanup_debug_info): Free
dwarf_addr_buffer and dwarf_str_offsets_buffer.
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PR 30743
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Fixes error reports about the length of EEOM records produced by gas.
PR 21618
* vms-alpha.c (evax_bfd_print_emh): Don't read subtyp if short
record. Consolidate error messages.
(evax_bfd_print_eeom): Allow length 10 record.
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This patch is in response to an oss-fuzz report regarding
use-of-uninitialized-value in bfd_is_section_compressed_info from
section contents provided by alpha_vms_get_section_contents. That
hole is covered by using bfd_zalloc rather than bfd_alloc.
The rest of the patch is mostly a tidy. In a function returning
section contents, I tend to prefer a test on the section properties
over a test on file properties. That's why I've changed the file
flags test to one on section filepos and flags before calling
_bfd_generic_get_section_contents. Also, fuzzed objects can easily
have sections with file backing in relocatable objects, or sections
without file backing in images. Possible confusion is avoided by
testing each section.
Note that we are always going to run into out-of-memory with fuzzed
alpha-vms object files due to sections with contents via ETIR records.
eg. ETIR__C_STO_IMMR stores a number of bytes repeatedly, with a
32-bit repeat count. So section contents can be very large from a
relatively small file. I'm inclined to think that an out-of-memory
error is fine for such files.
* vms-alpha.c (alpha_vms_get_section_contents): Handle sections
with non-zero filepos or without SEC_HAS_CONTENTS via
_bfd_generic_get_section_contents. Zero memory allocated for
sections filled by ETIR records.
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Also skip the archive if the symbol isn't referenced by a regular object.
bfd/
PR ld/31644
* elflink.c (elf_link_add_archive_symbols): Also skip the archive
if the symbol isn't referenced by a regular object.
ld/
PR ld/31644
* testsuite/ld-plugin/lto.exp: Run PR ld/31644 tests.
* testsuite/ld-plugin/pr31644a.c: New test.
* testsuite/ld-plugin/pr31644b.c: Likewise.
* testsuite/ld-plugin/pr31644c.c: Likewise.
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While the patch that Nick reverted in commit 3f6a060c7543 was in the
source, "FAIL: objcopy executable (pr25662)" was seen on ARC. The
failure was triggered by the .ARC.attributes section being removed by
the linker script. When a file lacking this section is copied by
objcopy, e_flags from the input is copied to the output (in this case
the value 0x406), but arc_elf_final_write_processing then logical-ors
in 0x300 when Tag_ARC_ABI_osver is not found.
* elf32-arc.c (arc_elf_final_write_processing): Don't ignore
existing e_flags for objcopy.
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Running the gdb test suite with the thread sanitizer enabled shows a
race when bfd_check_format_matches and bfd_cache_close_all are called
simultaneously on different threads.
This patch fixes this race by having bfd_check_format_matches
temporarily remove the BFD from the file descriptor cache -- leaving
it open while format-checking proceeds.
In this setup, the BFD client is responsible for closing the BFD again
on the "checking" thread, should that be desired. gdb does this by
calling bfd_cache_close in the relevant worker thread.
An earlier version of this patch omitted the "possibly_cached" helper
function. However, this ran into crashes in the binutils test suite
involving the archive-checking abort in bfd_cache_lookup_worker. I do
not understand the purpose of this check, so I've simply had the new
function work around it. I couldn't find any comments explaining this
situation, either. I suspect that there may still be races related to
this case, but I don't think I have access to the platforms where gdb
deals with archives.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31264
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A gdb bug found that bfd_check_format_matches has some data races when
called from multiple threads.
In particular, it changes the BFD error handler, which is a global.
It also has a local static variable ("in_check_format") that is used
for recursion detection. And, finally, it may emit warnings to the
per-xvec warning array, which is a global.
This patch removes all the races here.
The first part of patch is to change _bfd_error_handler to directly
handle the needs of bfd_check_format_matches. This way, the error
handler does not need to be changed.
This change lets us use the new per-thread global
(error_handler_messages, replacing error_handler_bfd) to also remove
the need for in_check_format -- a single variable suffices.
Finally, the global per-xvec array is replaced with a new type that
holds the error messages. The outermost such type is stack-allocated
in bfd_check_format_matches.
I tested this using the binutils test suite. I also built gdb with
thread sanitizer and ran the test case that was noted as failing.
Finally, Alan sent me the test file that caused the addition of the
xvec warning code in the first place, and I confirmed that "nm-new"
has the same behavior on this file both before and after this patch.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31264
Co-Authored-By: Alan Modra <amodra@gmail.com>
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applies to allocated sections, and only sections in the same segment are checked.
PR 31450
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environments.
PR 31527
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VMA->LMA relationship does not match the relationship of earlier sections in the segment.
PR 31540
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If we generate an object file using an assembler with the new
relocations added, and then linking those files with an older
linker, the link will still complete and the linked file will
be generated.
In this case we should report an error instead of continuing
the linking process.
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In commit b86d3af60ffc and 0ab0435fe672 I fixed SIGBUS errors found by
oss-fuzz now that --with-mmap defaults to enabled. It turns out there
are further problems with the aout mmap code: aout_read_minisymbols
returns the external symbol array, which is later freed by nm.c. If
the array is mmaped you can't free it. Now this could be fixed by
making aout minisymbols an array of pointers, but I figure there's not
much point in expending effort on that. So delete the aout mmap
support along with bfdwin.c and get_section_contents_in_window.
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Seen on mmix.
mmix +FAIL: ld-misc/defsym1
mmix +FAIL: sysroot-prefix common plain -Lpath, quoted
mmix +FAIL: sysroot-prefix common plain -Lpath, unquoted
mmix +FAIL: sysroot-prefix common full-path, quoted
mmix +FAIL: sysroot-prefix common full-path, unquoted
mmix +FAIL: sysroot-prefix common plain =-prefixed with empty, quoted
mmix +FAIL: sysroot-prefix common plain =-prefixed with empty, unquoted
mmix +FAIL: sysroot-prefix common plain $SYSROOT-prefixed with empty, quoted
mmix +FAIL: sysroot-prefix common plain $SYSROOT-prefixed with empty, unquoted
mmix +FAIL: sysroot-prefix common plain =-prefixed -Lpath, quoted
mmix +FAIL: sysroot-prefix common plain =-prefixed -Lpath, unquoted
mmix +FAIL: sysroot-prefix common plain $SYSROOT-prefixed -Lpath, quoted
mmix +FAIL: sysroot-prefix common plain $SYSROOT-prefixed -Lpath, unquoted
mmix +FAIL: sysroot-prefix common full-path =-prefixed without, quoted
mmix +FAIL: sysroot-prefix common full-path =-prefixed without, unquoted
mmix +FAIL: sysroot-prefix common full-path $SYSROOT-prefixed without, quoted
mmix +FAIL: sysroot-prefix common full-path $SYSROOT-prefixed without, unquoted
==3746597==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6070000007a0 at pc 0x56d87b0d1a40 bp 0x7fffb1629bf0 sp 0x7fffb1629be0
READ of size 8 at 0x6070000007a0 thread T0
#0 0x56d87b0d1a3f in elf_link_add_to_first_hash /home/alan/src/binutils-gdb/bfd/elflink.c:4312
mmix uses bfd_link_generic_hash_table.
* elflink.c (_bfd_elf_archive_symbol_lookup): Dont use first_hash
unless the hash table is bfd_link_elf_hash_table.
(elf_link_add_archive_symbols): Likewise.
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Return malloced memory in *mmap_base so that _bfd_munmap_readonly_temporary
will free it.
* libbfd.c (_bfd_mmap_read_temporary): Return malloced memory
in *mmap_base.
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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.
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Any of the calls to _bfd_delete_bfd in bfd_fopen will hit this.
* opncls.c (_bfd_delete_bfd): Check for non-NULL xvec before
accessing flavour.
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When -fsanitize=address,undefined is used to build, the mmap configure
check failed with
=================================================================
==231796==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 4096 byte(s) in 1 object(s) allocated from:
#0 0x7cdd3d0defdf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69
#1 0x5750c7f6d72b in main /home/alan/build/gas-san/all/bfd/conftest.c:239
Direct leak of 4096 byte(s) in 1 object(s) allocated from:
#0 0x7cdd3d0defdf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69
#1 0x5750c7f6d2e1 in main /home/alan/build/gas-san/all/bfd/conftest.c:190
SUMMARY: AddressSanitizer: 8192 byte(s) leaked in 2 allocation(s).
Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP to avoid the sanitizer
configure check failure.
bfd/
* configure.ac: Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
binutils/
* configure.ac: Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
ld/
* configure.ac: Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
libctf/
* configure.ac: Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
libsframe/
* configure.ac: Replace AC_FUNC_MMAP with GCC_AC_FUNC_MMAP.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
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Define _bfd_pagesize, _bfd_pagesize_m1 and _bfd_minimum_mmap_size only
if HAVE_MMAP is defined.
* libbfd-in.h (_bfd_pagesize): Declare only if HAVE_MMAP is
defined.
(_bfd_pagesize_m1): Likewise.
(_bfd_minimum_mmap_size): Likewise.
* libbfd.c (_bfd_pagesize): Define only if HAVE_MMAP is defined.
(_bfd_pagesize_m1): Likewise.
(_bfd_minimum_mmap_size): Likewise.
(bfd_init_pagesize): Likewise.
* lynx-core.c (lynx_core_file_p): Replace _bfd_pagesize with
getpagesize.
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Support zcmp extension push/pop/popret and popret zero instructions.
The `reg_list' is a list containing 1 to 13 registers, we can use:
"{ra}, {ra, s0}, {ra, s0-s1}, {ra, s0-s2} ... {ra, s0-sN}"
to present this feature.
Passed gcc/binutils regressions of riscv-gnu-toolchain.
Most of work was finished by Sinan Lin.
Co-Authored by: Charlie Keaney <charlie.keaney@embecosm.com>
Co-Authored by: Mary Bennett <mary.bennett@embecosm.com>
Co-Authored by: Nandni Jamnadas <nandni.jamnadas@embecosm.com>
Co-Authored by: Sinan Lin <sinan.lin@linux.alibaba.com>
Co-Authored by: Simon Cook <simon.cook@embecosm.com>
Co-Authored by: Shihua Liao <shihua@iscas.ac.cn>
Co-Authored by: Yulong Shi <yulong@iscas.ac.cn>
bfd/ChangeLog:
* elfxx-riscv.c (riscv_implicit_subset): Imply zca for zcmp.
(riscv_supported_std_z_ext): Added zcmp with version 1.0.
(riscv_parse_check_conflicts): Zcmp conflicts with d/zcd.
(riscv_multi_subset_supports): Handle zcmp.
(riscv_multi_subset_supports_ext): Ditto.
gas/ChangeLog:
* NEWS: Updated.
* config/tc-riscv.c (regno_to_reg_list): New function, used to map
register to reg_list number.
(reglist_lookup): Called reglist_lookup_internal. Return false if
reg_list number is zero, which is an invalid value.
(reglist_lookup_internal): Parse register list, and return the last
register by regno_to_reg_list.
(validate_riscv_insn): New operators.
(riscv_ip): Ditto.
* testsuite/gas/riscv/march-help.l: Updated.
* testsuite/gas/riscv/zcmp-push-pop-fail.d: New test.
* testsuite/gas/riscv/zcmp-push-pop-fail.l: New test.
* testsuite/gas/riscv/zcmp-push-pop-fail.s: New test.
* testsuite/gas/riscv/zcmp-push-pop.d: New test.
* testsuite/gas/riscv/zcmp-push-pop.s: New test.
include/ChangeLog:
* opcode/riscv-opc.h (MATCH/MASK_CM_PUSH): New macros for zcmp.
(MATCH/MASK_CM_POP): Ditto.
(MATCH/MASK_CM_POPRET): Ditto.
(MATCH/MASK_CM_POPRETZ): Ditto.
(DECLARE_INSN): New declarations for zcmp.
* opcode/riscv.h (EXTRACT/ENCODE/VALID_ZCMP_SPIMM): Handle spimm
operand for zcmp.
(OP_MASK_REG_LIST): Handle operand for zcmp register list.
(OP_SH_REG_LIST): Ditto.
(ZCMP_SP_ALIGNMENT): New argument, used in riscv_get_sp_base.
(X_S0, X_S1, X_S2, X_S10, X_S11): New register numbers.
(enum riscv_insn_class): Added INSN_CLASS_ZCMP.
(extern riscv_get_sp_base): Added.
opcodes/ChangeLog:
* riscv-dis.c (print_reg_list): New function, used to get zcmp
reg_list field.
(riscv_get_spimm): New function, used to get zcmp sp adjustment
immediate.
(print_insn_args): Handle new operands for zcmp.
* riscv-opc.c (riscv_get_sp_base): New function, used by gas and
objdump. Get sp base adjustment.
(riscv_opcodes): Added zcmp instructions.
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Move .got .got.plt before .data so .got can be protected with -zrelro.
And the first two entries of .got.plt (_dl_runtime_resolve and link map)
are placed within the relro region.
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All of bfdwin.c is wrapped in USE_MMAP. There isn't any point in
HAVE_MMAP tests inside USE_MMAP.
* bfdwin.c (bfd_free_window, bfd_get_file_window): Delete
HAVE_MMAP conditionals.
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