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There are two flags currently defined: SCANF_LDBL_IS_DBL is the mode
used by __nldbl_ scanf variants, and SCANF_ISOC99_A is the mode used
by __isoc99_ scanf variants. In this patch, the new functions honor
these flag bits if they're set, but they still also look at the
corresponding bits of environmental state, and callers all pass zero.
The new functions do *not* have the "errp" argument possessed by
_IO_vfscanf and _IO_vfwscanf. All internal callers passed NULL for
that argument. External callers could theoretically exist, so I
preserved wrappers, but they are flagged as compat symbols and they
don't preserve the three-way distinction among types of errors that
was formerly exposed. These functions probably should have been in
the list of deprecated _IO_ symbols in 2.27 NEWS -- they're not just
aliases for vfscanf and vfwscanf.
(It was necessary to introduce ldbl_compat_symbol for _IO_vfscanf.
Please check that part of the patch very carefully, I am still not
confident I understand all of the details of ldbl-opt.)
This patch also introduces helper inlines in libio/strfile.h that
encapsulate the process of initializing an _IO_strfile object for
reading. This allows us to call __vfscanf_internal directly from
sscanf, and __vfwscanf_internal directly from swscanf, without
duplicating the initialization code. (Previously, they called their
v-counterparts, but that won't work if we want to control *both* C99
mode and ldbl-is-dbl mode using the flags argument to__vfscanf_internal.)
It's still a little awkward, especially for wide strfiles, but it's
much better than what we had.
Tested for powerpc and powerpc64le.
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Now that __time64_t exists, we can switch internal function
__tz_convert from 32-bit to 64-bit time. This involves switching
some other internal functions as well, namely __tz_compute and
__offtime.
Tested with 'make check' on x86_64-linux-gnu and i686-linux.gnu.
* include/time.h
(__tz_compute): Replace time_t with __time64_t.
(__tz_convert): Replace time_t* with __time64_t.
(__offtime): Replace time_t* with __time64_t.
* time/gmtime.c
(__gmtime_r): Adjust call to __tz_convert.
(gmtime): Likewise.
* time/localtime.c
(__localtime_r): Likewise.
(localtime): Likewise.
* time/offtime.c: Replace time_t with __time64_t.
* time/tzset.c: Likewise.
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I noticed that, now that build-many-glibcs.py no longer copies glibc
sources, I was getting core dumps in my glibc source directories. The
cause appears to be, from the i686-gnu build:
for dso in ` env LD_TRACE_LOADED_OBJECTS=1 \
/scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/elf/ld.so.1 \
/scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/testroot.pristine/bin/sh \
[...]
Segmentation fault (core dumped)
In this case, the x86 architecture means the binary executes, but
dumps core rather than actually working.
Anything involving running the newly built glibc should only be done
ifeq ($(run-built-tests),yes). This patch conditions the relevant
part of the testroot setup accordingly.
Tested for x86_64, and with build-many-glibcs.py for i686-gnu.
* Makefile ($(objpfx)testroot.pristine/install.stamp): Do not run
dynamic linker unless [$(run-built-tests) = yes].
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* support/test-container.c (check_for_unshare_hints): New.
(main): Call it if unshare fails. Add support for "su" scriptlet
command.
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It was reported in
<https://sourceware.org/ml/libc-alpha/2018-12/msg00045.html> that
gen-as-const.py fails to generate test code in the case where a .sym
file has no symbols in it, so resulting in a test failing to link for
Hurd.
The relevant difference from the old awk script is that the old script
treated '--' lines as indicating that the text to do at the start of
the test (or file used to compute constants) should be output at that
point if not already output, as well as treating lines with actual
entries for constants like that. This patch changes gen-as-const.py
accordingly, making it the sole responsibility of the code parsing
.sym files to determine when such text should be output and ensuring
it's always output at some point even if there are no symbols and no
'--' lines, since not outputting it means the test fails to link.
Handling '--' like that also avoids any problems that would arise if
the first entry for a symbol were inside #ifdef (since the text in
question must not be output inside #ifdef).
Tested for x86_64, and with build-many-glibcs.py for i686-gnu. Note
that there are still compilation test failures for i686-gnu
(linknamespace tests, possibly arising from recent posix_spawn-related
changes).
* scripts/gen-as-const.py (compute_c_consts): Take an argument
'START' to indicate that start text should be output.
(gen_test): Likewise.
(main): Generate 'START' for first symbol or '--' line, or at end
of input if not previously generated.
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I have tested that this builds and the resulting program still work.
The kernel in gcc117 (which I ussed for testing) seems to be missing
https://patchwork.kernel.org/patch/10060431/, so the vdso is never used.
[BZ #19767]
* sysdeps/unix/sysv/linux/arm/init-first.c: Remove #ifdef SHARED.
* sysdeps/unix/sysv/linux/arm/libc-vdso.h: Remove #ifdef SHARED.
* sysdeps/unix/sysv/linux/arm/sysdep.h: Define
ALWAYS_USE_VSYSCALL.
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This patch is essentially 28669f86f6 adjusted for the generic
implementation.
Checked on x86_64-linux-gnu with Linux spawni.c removed. The only
failure is posix/tst-spawn3, which is expected.
[BZ #23913]
* sysdeps/posix/spawni.c (maybe_script_execute):
Increment size of new_argv by one.
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Downstream distributions need consistent sets of hardlinks in
order for rpm to operate effectively. This means that even if
locales are built with a high level of parallelism that the
resulting files need to have consistent hardlink counts. The only
way to achieve this is with a post-install hardlink pass using a
program like 'hardlink' (shipped in Fedora).
If the downstream distro wants to post-process the hardlinks then
the time spent in localedef looking up sibling directories and
processing hardlinks is wasted effort.
To optimize the build and install pass we add a --no-hard-links
option to localedef to avoid doing the hardlink optimziation for
size.
Tested on x86_64 with 'make localedata/install-locale-files'
before and after. Without the patch we have files with 100+
hardlink counts. After the patch and running with --no-hard-links
all link counts are 1. This patch also alters the convenience
target 'make localedata/install-locale-files' to use the new
option.
Signed-off-by: Carlos O'Donell <carlos@redhat.com>
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Extend CPUID support for all feature bits from CPUID. Add a new macro,
CPU_FEATURE_USABLE, which can be used to check if a feature is usable at
run-time, instead of HAS_CPU_FEATURE and HAS_ARCH_FEATURE.
Add COMMON_CPUID_INDEX_D_ECX_1, COMMON_CPUID_INDEX_80000007 and
COMMON_CPUID_INDEX_80000008 to check CPU feature bits in them.
Tested on i686 and x86-64 as well as using build-many-glibcs.py with
x86 targets.
* sysdeps/x86/cacheinfo.c (intel_check_word): Updated for
cpu_features_basic.
(__cache_sysconf): Likewise.
(init_cacheinfo): Likewise.
* sysdeps/x86/cpu-features.c (get_extended_indeces): Also
populate COMMON_CPUID_INDEX_80000007 and
COMMON_CPUID_INDEX_80000008.
(get_common_indices): Also populate COMMON_CPUID_INDEX_D_ECX_1.
Use CPU_FEATURES_CPU_P (cpu_features, XSAVEC) to check if
XSAVEC is available. Set the bit_arch_XXX_Usable bits.
(init_cpu_features): Use _Static_assert on
index_arch_Fast_Unaligned_Load.
__get_cpuid_registers and __get_arch_feature. Updated for
cpu_features_basic. Set stepping in cpu_features.
* sysdeps/x86/cpu-features.h: (FEATURE_INDEX_1): Changed to enum.
(FEATURE_INDEX_2): New.
(FEATURE_INDEX_MAX): Changed to enum.
(COMMON_CPUID_INDEX_D_ECX_1): New.
(COMMON_CPUID_INDEX_80000007): Likewise.
(COMMON_CPUID_INDEX_80000008): Likewise.
(cpuid_registers): Likewise.
(cpu_features_basic): Likewise.
(CPU_FEATURE_USABLE): Likewise.
(bit_arch_XXX_Usable): Likewise.
(cpu_features): Use cpuid_registers and cpu_features_basic.
(bit_arch_XXX): Reweritten.
(bit_cpu_XXX): Likewise.
(index_cpu_XXX): Likewise.
(reg_XXX): Likewise.
* sysdeps/x86/tst-get-cpu-features.c: Include <stdio.h> and
<support/check.h>.
(CHECK_CPU_FEATURE): New.
(CHECK_CPU_FEATURE_USABLE): Likewise.
(cpu_kinds): Likewise.
(do_test): Print vendor, family, model and stepping. Check
HAS_CPU_FEATURE and CPU_FEATURE_USABLE.
(TEST_FUNCTION): Removed.
Include <support/test-driver.c> instead of
"../../test-skeleton.c".
* sysdeps/x86_64/multiarch/sched_cpucount.c (__sched_cpucount):
Check POPCNT instead of POPCOUNT.
* sysdeps/x86_64/multiarch/test-multiarch.c (do_test): Likewise.
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hurd's jmp_buf-ssp.sym does not define any symbol.
scripts/gen-as-const.py currently was emitting an empty line in that
case, and the gawk invocation was prepending "asconst_" to it, ending up
with:
.../build/glibc/setjmp/test-as-const-jmp_buf-ssp.c:1:2: error: expected « = », « , », « ; », « asm » or
« __attribute__ » at end of input
1 | asconst_
| ^~~~~~~~
* scripts/gen-as-const.py (main): Avoid emitting empty line when
there is no element in `consts'.
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Fortunately we were previously only missing an optimization.
Thanks dcb <dcb314@hotmail.com> for the report
[BZ #23032]
* sysdeps/htl/pt-barrier-init.c (pthread_barrier_init): Fix comparing
attr with __pthread_default_barrierattr.
* sysdeps/htl/pt-cond-init.c (__pthread_cond_init): Fix comparing
attr with __pthread_default_condattr.
* sysdeps/htl/pt-mutex-init.c (_pthread_mutex_init): Fix comparing
attr with __pthread_default_mutexattr.
* sysdeps/htl/pt-rwlock-init.c (_pthread_rwlock_init): Fix comparing
attr with __pthread_default_rwlockattr.
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This patch does not have any functionality change, we only provide a spin
count tunes for pthread adaptive spin mutex. The tunable
glibc.pthread.mutex_spin_count tunes can be used by system administrator to
squeeze system performance according to different hardware capabilities and
workload characteristics.
The maximum value of spin count is limited to 32767 to avoid the overflow
of mutex->__data.__spins variable with the possible type of short in
pthread_mutex_lock ().
The default value of spin count is set to 100 with the reference to the
previous number of times of spinning via trylock. This value would be
architecture-specific and can be tuned with kinds of benchmarks to fit most
cases in future.
I would extend my appreciation sincerely to H.J.Lu for his help to refine
this patch series.
* manual/tunables.texi (POSIX Thread Tunables): New node.
* nptl/Makefile (libpthread-routines): Add pthread_mutex_conf.
* nptl/nptl-init.c: Include pthread_mutex_conf.h
(__pthread_initialize_minimal_internal) [HAVE_TUNABLES]: Call
__pthread_tunables_init.
* nptl/pthreadP.h (MAX_ADAPTIVE_COUNT): Remove.
(max_adaptive_count): Define.
* nptl/pthread_mutex_conf.c: New file.
* nptl/pthread_mutex_conf.h: New file.
* sysdeps/generic/adaptive_spin_count.h: New file.
* sysdeps/nptl/dl-tunables.list: New file.
* nptl/pthread_mutex_lock.c (__pthread_mutex_lock): Use
max_adaptive_count () not MAX_ADAPTIVE_COUNT.
* nptl/pthread_mutex_timedlock.c (__pthrad_mutex_timedlock):
Likewise.
Suggested-by: Andi Kleen <andi.kleen@intel.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Signed-off-by: Kemi.wang <kemi.wang@intel.com>
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[BZ #19767]
* sysdeps/unix/sysv/linux/i386/init-first.c: Don't check SHARED.
* sysdeps/unix/sysv/linux/i386/sysdep.h (ALWAYS_USE_VSYSCALL):
New.
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Hurd has this in libc.so:
0024db9c g D .bss 00000000 GLIBC_2.2.6 _end
This g/D combination was not recognized before.
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This patch uses posix_spawn on system implementation. On Linux this has
the advantage of much lower memory consumption (usually 32 Kb minimum for
the mmap stack area).
Although POSIX does not require, glibc system implementation aims to be
thread and cancellation safe. The cancellation code is moved to generic
implementation and enabled iff SIGCANCEL is defined (similar on how the
cancellation handler is enabled on nptl-init.c).
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
arm-linux-gnueabihf, and powerpc64le-linux-gnu.
* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Use
__sigismember instead of sigismember.
* sysdeps/posix/system.c [SIGCANCEL] (cancel_handler_args,
cancel_handler): New definitions.
(CLEANUP_HANDLER, CLEANUP_RESET): Likewise.
(DO_LOCK, DO_UNLOCK, INIT_LOCK, ADD_REF, SUB_REF): Remove.
(do_system): Use posix_spawn instead of fork and execl and remove
reentracy code.
* sysdeps/generic/not-errno.h (__kill_noerrno): New prototype.
* sysdeps/unix/sysv/linux/not-errno.h (__kill_noerrno): Likewise.
* sysdeps/unix/sysv/linux/ia64/system.c: Remove file.
* sysdeps/unix/sysv/linux/s390/system.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/system.c: Likewise.
* sysdeps/unix/sysv/linux/system.c: Likewise.
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This patch uses posix_spawn on popen instead of fork and execl. On Linux
this has the advantage of much lower memory consumption (usually 32 Kb
minimum for the mmap stack area).
Two issues are also fixed with this change:
* BZ#17490: although POSIX pthread_atfork description only list 'fork'
as the function that should execute the atfork handlers, popen
description states that:
'[...] shall be *as if* a child process were created within the popen()
call using the fork() function [...]'
Other libc/system seems to follow the idea atfork handlers should not be
executed for popen:
libc/system | run atfork handles | notes
------------|----------------------|---------------------------------------
Freebsd | no | uses vfork
Solaris 11 | no |
MacOSX 11 | no | implemented through posix_spawn syscall
------------|----------------------|----------------------------------------
Similar to posix_spawn and system, popen idea is to spawn a different
binary so all the POSIX rationale to run the atfork handlers to avoid
internal process inconsistency is not really required and in some cases
might be unsafe.
* BZ#22834: the described scenario, where the forked process might access
invalid memory due an inconsistent state in multithreaded environment,
should not happen because posix_spawn does not access the affected
data structure (proc_file_chain).
Checked on x86_64-linux-gnu and i686-linux-gnu.
[BZ #22834]
[BZ #17490]
* NEWS: Add new semantic for atfork with popen and system.
* libio/iopopen.c (_IO_new_proc_open): use posix_spawn instead of
fork and execl.
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There is a data-dependency between the fields of struct l_reloc_result
and the field used as the initialization guard. Users of the guard
expect writes to the structure to be observable when they also observe
the guard initialized. The solution for this problem is to use an acquire
and release load and store to ensure previous writes to the structure are
observable if the guard is initialized.
The previous implementation used DL_FIXUP_VALUE_ADDR (l_reloc_result->addr)
as the initialization guard, making it impossible for some architectures
to load and store it atomically, i.e. hppa and ia64, due to its larger size.
This commit adds an unsigned int to l_reloc_result to be used as the new
initialization guard of the struct, making it possible to load and store
it atomically in all architectures. The fix ensures that the values
observed in l_reloc_result are consistent and do not lead to crashes.
The algorithm is documented in the code in elf/dl-runtime.c
(_dl_profile_fixup). Not all data races have been eliminated.
Tested with build-many-glibcs and on powerpc, powerpc64, and powerpc64le.
[BZ #23690]
* elf/dl-runtime.c (_dl_profile_fixup): Guarantee memory
modification order when accessing reloc_result->addr.
* include/link.h (reloc_result): Add field init.
* nptl/Makefile (tests): Add tst-audit-threads.
(modules-names): Add tst-audit-threads-mod1 and
tst-audit-threads-mod2.
Add rules to build tst-audit-threads.
* nptl/tst-audit-threads-mod1.c: New file.
* nptl/tst-audit-threads-mod2.c: Likewise.
* nptl/tst-audit-threads.c: Likewise.
* nptl/tst-audit-threads.h: Likewise.
Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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This patch replaces gen-as-const.awk, and some fragments of the
Makefile code that used it, by a Python script. The point is not such
much that awk is problematic for this particular script, as that I'd
like to build up a general Python infrastructure for extracting
information from C headers, for use in writing tests of such headers.
Thus, although this patch does not set up such infrastructure, the
compute_c_consts function in gen-as-const.py might be moved to a
separate Python module in a subsequent patch as a starting point for
such infrastructure.
The general idea of the code is the same as in the awk version, but no
attempt is made to make the output files textually identical. When
generating a header, a dict of constant names and values is generated
internally then defines are printed in sorted order (rather than the
order in the .sym file, which would have been used before). When
generating a test that the values computed match those from a normal
header inclusion, the test code is made into a compilation test using
_Static_assert, where previously the comparisons were done only when
the test was executed. One fragment of test generation (converting
the previously generated header to use asconst_* prefixes on its macro
names) is still in awk code in the makefiles; only the .sym processing
and subsequent execution of the compiler to extract constants have
moved to the Python script.
Tested for x86_64, and with build-many-glibcs.py.
* scripts/gen-as-const.py: New file.
* scripts/gen-as-const.awk: Remove.
* Makerules ($(common-objpfx)%.h $(common-objpfx)%.h.d): Use
gen-as-const.py.
($(objpfx)test-as-const-%.c): Likewise.
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Tested with build-many-glibcs.py.
* elf/dl-exception.c: Include <_itoa.h>.
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to avoid calling va_end again, etc.
* sysdeps/mach/hurd/fcntl.c (__libc_fcntl): Directly return value
returned by __f_setlk.
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Add support for %x, %lx and %zx to _dl_exception_create_format and pad
to the full width with 0.
* elf/Makefile (tests-internal): Add tst-create_format1.
* elf/dl-exception.c (_dl_exception_create_format): Support
%x, %lx and %zx.
* elf/tst-create_format1.c: New file.
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_IO_fwide() is defined in libio.h file. This file is included only
when _LIBC is defined.
So, in case of compilation of these files without _LIBC definition,
the compilation failed due to this unknown function.
Now this function is called when libio.h file is included.
(Change merged from gnulib. Tested on x86_64.)
* argp/argp-fmtstream.c (__argp_fmtstream_update): Use [_LIBC]
conditional on calls to _IO_fwide and putwc_unlocked. (Merge from
gnulib.)
* argp/argp-help.c (__argp_failure): Likewise.
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* elf/elf.h (EM_CSKY, R_CKCORE_NONE, R_CKCORE_ADDR32)
(R_CKCORE_PCRELIMM8BY4, R_CKCORE_PCRELIMM11BY2, R_CKCORE_PCREL32)
(R_CKCORE_PCRELJSR_IMM11BY2, R_CKCORE_RELATIVE, R_CKCORE_COPY)
(R_CKCORE_GLOB_DAT, R_CKCORE_JUMP_SLOT, R_CKCORE_GOTOFF)
(R_CKCORE_GOTPC, R_CKCORE_GOT32, R_CKCORE_PLT32, R_CKCORE_ADDRGOT)
(R_CKCORE_ADDRPLT, R_CKCORE_PCREL_IMM26BY2, R_CKCORE_PCREL_IMM16BY2)
(R_CKCORE_PCREL_IMM16BY4, R_CKCORE_PCREL_IMM10BY2)
(R_CKCORE_PCREL_IMM10BY4, R_CKCORE_ADDR_HI16, R_CKCORE_ADDR_LO16)
(R_CKCORE_GOTPC_HI16, R_CKCORE_GOTPC_LO16, R_CKCORE_GOTOFF_HI16)
(R_CKCORE_GOTOFF_LO16, R_CKCORE_GOT12, R_CKCORE_GOT_HI16)
(R_CKCORE_GOT_LO16, R_CKCORE_PLT12, R_CKCORE_PLT_HI16)
(R_CKCORE_PLT_LO16, R_CKCORE_ADDRGOT_HI16, R_CKCORE_ADDRGOT_LO16)
(R_CKCORE_ADDRPLT_HI16, R_CKCORE_ADDRPLT_LO16)
(R_CKCORE_PCREL_JSR_IMM26BY2, R_CKCORE_TOFFSET_LO16)
(R_CKCORE_DOFFSET_LO16, R_CKCORE_PCREL_IMM18BY2)
(R_CKCORE_DOFFSET_IMM18, R_CKCORE_DOFFSET_IMM18BY2)
(R_CKCORE_DOFFSET_IMM18BY4, R_CKCORE_GOT_IMM18BY4)
(R_CKCORE_PLT_IMM18BY4, R_CKCORE_PCREL_IMM7BY4, R_CKCORE_TLS_LE32)
(R_CKCORE_TLS_IE32, R_CKCORE_TLS_GD32, R_CKCORE_TLS_LDM32)
(R_CKCORE_TLS_LDO32, R_CKCORE_TLS_DTPMOD32, R_CKCORE_TLS_DTPOFF32)
(R_CKCORE_TLS_TPOFF32): New defines.
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These files were both auto-generated and shipped in the source tree.
We can assume that sed is available and always generate the files
during the build.
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Signal zero does not terminate a process, so it is safe to use negative
values for signal numbers.
Adjust libio/tst-vtables-common.c to use this new functionality,
instead of determining the termination status for a signal indirectly.
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Now that build-many-glibcs.py touches at checkout time all files that
might get rebuilt in the glibc source directory in a normal glibc
build and test run, this patch stops the script from copying the glibc
source directory, so that all builds use the original directory
directly (and less disk space is used, less I/O is involved and cached
copies of the sources in memory can be shared between all the builds -
as well as avoiding spurious failures from copying while "git gc" is
running). This is similar to how all other components were already
handled. Any bugs involving writing into the source directory can be
dealt with in future as normal bugs, just as such bugs already are
handled.
Tested with build-many-glibcs.py runs with a read-only glibc source
directory, with all files not touched by the script having timestamps
in forwards alphabetical order and separately with all files not
touched by the script having timestamps in backwards alphabetical
order.
* scripts/build-many-glibcs.py (Glibc.build_glibc): Use original
source directory instead of a copy.
(CommandList.create_copy_dir): Remove.
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Regenerated ulps from scratch as builds with gcc 5.5 / 6.4
resulted in +1 ulps.
ChangeLog:
* sysdeps/s390/fpu/libm-test-ulps: Regenerated.
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This avoids a build failure if this identifier is used as a macro
in a test.
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The logic for generating sysdeps/mach/hurd/bits/errno.h involves a
stamp file and $(move-if-change).
The temporary file (generated unconditionally) is generated in the
source directory. This means that even if
sysdeps/mach/hurd/bits/errno.h is up to date, and has an up to date
timestamp, the build will fail if the source directory is read-only.
Even with a writable source directory, multiple concurrent builds for
i686-gnu with the same source directory could race to access the
temporary file (which always has the same name).
This patch uses the build directory for the temporary file instead to
avoid those problems. (In the case where the file is out of date and
the temporary file does need to be moved to the source directory, if
there are multiple concurrent builds for i686-gnu with the same source
directory, and the source and build directories are on different
filesystems, it's possible there might still be races replacing the
file in the source directory, depending on exactly how mv handles such
cross-filesystem moves. This is certainly no worse than the present
situation, where such a case would have races regardless of whether
the file is out of date or whether different filesystems are in use.)
Tested with a build-many-glibcs.py build for i686-gnu.
* sysdeps/mach/hurd/Makefile ($(common-objpfx)stamp-errnos): Use
$(hurd-objpfx)bits/errno.h-tmp, not $(hurd)/bits/errno.h-tmp.
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Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
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[BZ #19767]
* sysdeps/unix/sysv/linux/aarch64/init-first.c: Remove #ifdef SHARED.
* sysdeps/unix/sysv/linux/aarch64/libc-vdso.h: Remove #ifdef SHARED.
* sysdeps/unix/sysv/linux/aarch64/sysdep.h (ALWAYS_USE_VSYSCALL):
Define.
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Mathieu Desnoyers ran into an issue with his rseq patch where he
was the first person to add weak thread-local data and this
resulted in an ABI list update with entries like this:
"GLIBC_2.29 w ? D .tdata 0000000000000020".
The weakness of the symbol has nothing to do with the DSOs ABI
and so we should not write anything about weak symbols here. The
.tdata entries should be treated exactly like .tbss entries and
the output should have been: "GLIBC_2.29 __rseq_abi T 0x20"
This change makes abilist.awk handle .tdata just like .tbss,
while at the same time adding an error case for the default, and
the unknown line cases. We never want anyone to be able to add
such entries to any ABI list files and should see an immediate
error and consult with experts.
Tested by Mathieu Desnoyers <mathieu.desnoyers@efficios.com> with
the rseq patch set and 'make update-all-abi'.
Tested myself with 'make update-all-abi' on x86_64 with no
changes.
Signed-off-by: Carlos O'Donell <carlos@redhat.com>
|
|
build-many-glibcs.py currently copies the source tree to avoid issues
with parallel builds trying to write into it. This copying can result
in occasional spurious build failures from bots, when a "git gc" is in
progress that changes .git contents while copying is taking place, and
it would also be desirable to avoid the need to copy to save on disk
space, I/O and memory used in build-many-glibcs.py builds.
In preparation for removing the copying, this patch arranges for
build-many-glibcs.py to touch more files on checkout so their
timestamps do not result in make attempting to rebuild them. Before
actually removing the copying, I intend to do further tests to ensure
I haven't missed any other such makefile dependencies.
This is of course without prejudice to possibly moving more of these
files to being generated in the build directory rather than being
checked in at all, where that can be done using build tools already
required for the build. For sysdeps files (installed and otherwise)
it would be necessary to make sure this does not affect the search
ordering, for headers used in the build it would be necessary to
ensure they are generated early enough, and for errlist.c there may be
dual licensing reasons for keeping it checked in.
Tested that a checkout with build-many-glibcs.py does touch the
expected files and that a glibcs build for aarch64-linux-gnu succeeds.
* scripts/build-many-glibcs.py (Context.fix_glibc_timestamps):
Touch additional files.
|
|
The previous check could read beyond the end of the tcache entry
array. If the e->key == tcache cookie check happened to pass, this
would result in crashes.
|
|
[BZ #19767]
* sysdeps/unix/sysv/linux/powerpc/init-first.c: Remove #ifdef SHARED.
* sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Remove #ifdef
SHARED. Include sysdep.h.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h: Define
ALWAYS_USE_VSYSCALL.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h: Define
ALWAYS_USE_VSYSCALL.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
|
|
All the required code already existed, and some of it was already
running.
AT_SYSINFO_EHDR is processed if NEED_DL_SYSINFO_DSO is defined, but it
looks like it always is. The call to setup_vdso is also unconditional,
so all that was left to do was setup the function pointers and use
them. This patch just deletes some #ifdef to enable that.
[BZ #19767]
* nptl/Makefile (tests-static): Add tst-cond11-static.
(tests): Likewise.
* nptl/tst-cond11-static.c: New File.
* sysdeps/unix/sysv/linux/Makefile (tests-static): Add
tst-affinity-static.
(tests): Likewise.
* sysdeps/unix/sysv/linux/sysdep-vdso.h: Check USE_VSYSCALL
instead of SHARED.
* sysdeps/unix/sysv/linux/sysdep.h (ALWAYS_USE_VSYSCALL): New.
(USE_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/tst-affinity-static.c: New file.
* sysdeps/unix/sysv/linux/x86/libc-vdso.h: Check USE_VSYSCALL
instead of SHARED.
* sysdeps/unix/sysv/linux/x86_64/init-first.c: Don't check
SHARED.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h (ALWAYS_USE_VSYSCALL):
New.
|
|
The generic kernel-features.h defines __ASSUME_COPY_FILE_RANGE for 4.5
and later kernels. However, for 32-bit Arm binaries running on 64-bit
Arm kernels, the syscall was only wired up in the 4.7 kernel, although
the 32-bit Arm kernel had the syscall from 4.5 onwards. This patch
corrects the Arm kernel-features.h to undefine the macro for
configured minimum kernel versions before 4.7.
Tested (compilation only) with a build-many-glibcs.py build for
arm-linux-gnueabi.
[BZ #23915]
* sysdeps/unix/sysv/linux/arm/kernel-features.h
[__LINUX_KERNEL_VERSION < 0x040700] (__ASSUME_COPY_FILE_RANGE):
Undefine.
|
|
Add a re-exec test with legacy bitmap to verify that legacy bitmap is
properly hanlded by kernel.
* sysdeps/x86/Makefile (tests): Add tst-cet-legacy-1a.
(tst-cet-legacy-1a-ARGS): New.
($(objpfx)tst-cet-legacy-1a): New target.
* sysdeps/x86/tst-cet-legacy-1a.c: New file.
|
|
In <https://sourceware.org/ml/libc-alpha/2018-11/msg00225.html>,
Florian reported that the change from conformtest.pl to conformtest.py
had increased conform/ test time, possibly because of increased
startup overhead for Python scripts.
This patch improves conformtest.py performance by arranging for as
many tests of a (header, standard) pair as possible to use a single
execution of the compiler, so it does not need to initialize and parse
the whole header under test separately for every test assertion.
Specifically, compilation tests that are not marked as "optional" or
"xfail" are combined into a single source file, and are only then run
separately if compilation of that combined file fails. For me, this
reduces the wall clock time for the conformtest.py tests (not the
whole of the conform/ directory) from two minutes to 15 seconds.
Tested for x86_64, and with build-many-glibcs.py.
* conform/conformtest.py (CompileSubTest.__init__): Set
self.run_early to False.
(ExecuteSubTest.__init__): Likewise.
(HeaderTests.run): Try running all non-optional, non-XFAILed
compilation tests in a single execution of the compiler.
|
|
This patch continues moving conformtest towards running more tests in
a single compiler execution by separating the generation and execution
of the subtests of each test.
Instead of test classes having a run method that both generates the
text of the programs to be compiled or executed, and compiles or
executes them, they are changed to having a gen_subtests method that
just generates CompileSubTest and ExecuteSubTest objects to store the
subtest names and text, and then a separate loop in HeaderTests.run
deals with actually executing those subtests.
This will allow for future changes to extract the text for all
non-optional, non-xfail compilation subtests to try compiling those
all at once, with separate compilations only if that fails, so
massively reducing the number of separate compiler executions (each of
which needs to parse the entire contents of the header under test, in
addition to the startup cost that applies even for compiling an empty
file).
Tested for x86_64, and with build-many-glibcs.py.
* conform/conformtest.py (CompileSubTest): New class.
(ExecuteSubTest): Likewise.
(ElementTest.run): Rename to gen_subtests. Append tests to
self.subtests instead of running them.
(ConstantTest.run): Likewise.
(SymbolTest.run): Likewise.
(TypeTest.run): Likewise.
(TagTest.run): Likewise.
(FunctionTest.run): Likewise.
(VariableTest.run): Likewise.
(MacroFunctionTest.run): Likewise.
(MacroStrTest.run): Likewise.
(HeaderTests.handle_test_line): Generate subtests for tests.
(HeaderTests.run): Run subtests for tests.
|
|
Introduce new pow symbol version that doesn't do SVID compatible error
handling. The standard errno and fp exception based error handling is
inline in the new code and does not have significant overhead.
The wrapper is disabled for sysdeps/ieee754/dbl-64 by using empty
w_pow.c and enabled for targets with their own pow implementation or
ifunc dispatch on __ieee754_pow by including math/w_pow.c.
The compatibility symbol version still uses the wrapper with SVID error
handling around the new code. There is no new symbol version nor
compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).
On targets where previously powl was an alias of pow, now it points to
the compatibility symbol with the wrapper, because it still need the
SVID compatible error handling. This affects NO_LONG_DOUBLE (e.g. arm)
and LONG_DOUBLE_COMPAT (e.g. alpha) targets as well.
The __pow_finite symbol is now an alias of pow. Both __pow_finite and
pow set errno and thus not const functions.
The ia64 asm is changed so the compat and new symbol versions map to the
same address.
On x86_64 #include <math.h> was added before macro definitions that
may affect that header.
Tested with build-many-glibcs.py.
* math/Versions (GLIBC_2.29): Add pow.
* math/w_pow_compat.c (__pow_compat): Change to versioned compat
symbol.
* math/w_pow.c: New file.
* sysdeps/i386/fpu/w_pow.c: New file.
* sysdeps/ia64/fpu/e_pow.S: Add versioned symbols.
* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Rename to __pow
and add necessary aliases.
* sysdeps/ieee754/dbl-64/w_pow.c: New file.
* sysdeps/m68k/m680x0/fpu/w_pow.c: New file.
* sysdeps/mach/hurd/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
* sysdeps/x86_64/fpu/multiarch/e_pow-fma.c (__ieee754_pow): Rename to
__pow.
* sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c (__ieee754_pow): Likewise.
* sysdeps/x86_64/fpu/multiarch/e_pow.c (__ieee754_pow): Likewise.
* sysdeps/x86_64/fpu/multiarch/w_pow.c: New file.
|
|
Introduce new log2 symbol version that doesn't do SVID compatible error
handling. The standard errno and fp exception based error handling is
inline in the new code and does not have significant overhead.
The wrapper is disabled for sysdeps/ieee754/dbl-64 by using empty
w_log2.c and enabled for targets with their own log2 implementation by
including math/w_log2.c.
The compatibility symbol version still uses the wrapper with SVID error
handling around the new code. There is no new symbol version nor
compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).
On targets where previously log2l was an alias of log2, now it points to
the compatibility symbol with the wrapper, because it still need the
SVID compatible error handling. This affects NO_LONG_DOUBLE (e.g. arm)
and LONG_DOUBLE_COMPAT (e.g. alpha) targets as well.
The __log2_finite symbol is now an alias of log2. Both __log2_finite
and log2 set errno and thus not const functions.
The ia64 asm is changed so the compat and new symbol versions map to the
same address.
Tested with build-many-glibcs.py.
* math/Versions (GLIBC_2.29): Add log2.
* math/w_log2_compat.c (__log2_compat): Change to versioned compat
symbol.
* math/w_log2.c: New file.
* sysdeps/i386/fpu/w_log2.c: New file.
* sysdeps/ia64/fpu/e_log2.S: Add versioned symbols.
* sysdeps/ieee754/dbl-64/e_log2.c (__ieee754_log2): Rename to __log2
and add necessary aliases.
* sysdeps/ieee754/dbl-64/w_log2.c: New file.
* sysdeps/m68k/m680x0/fpu/w_log2.c: New file.
* sysdeps/mach/hurd/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
|
|
Introduce new log symbol version that doesn't do SVID compatible error
handling. The standard errno and fp exception based error handling is
inline in the new code and does not have significant overhead.
The wrapper is disabled for sysdeps/ieee754/dbl-64 by using empty
w_log.c and enabled for targets with their own log implementation by
including math/w_log.c.
The compatibility symbol version still uses the wrapper with SVID error
handling around the new code. There is no new symbol version nor
compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).
On targets where previously logl was an alias of log, now it points to
the compatibility symbol with the wrapper, because it still need the
SVID compatible error handling. This affects NO_LONG_DOUBLE (e.g. arm)
and LONG_DOUBLE_COMPAT (e.g. alpha) targets as well.
The __log_finite symbol is now an alias of log. Both __log_finite and
log set errno and thus not const functions.
The ia64 asm is changed so the compat and new symbol versions map to the
same address.
On x86_64 #include <math.h> was added before macro definitions that may
affect that header.
Tested with build-many-glibcs.py.
* math/Versions (GLIBC_2.29): Add log.
* math/w_log_compat.c (__log_compat): Change to versioned compat
symbol.
* math/w_log.c: New file.
* sysdeps/i386/fpu/w_log.c: New file.
* sysdeps/ia64/fpu/e_log.S: Update.
* sysdeps/ieee754/dbl-64/e_log.c (__ieee754_log): Rename to __log
and add necessary aliases.
* sysdeps/ieee754/dbl-64/w_log.c: New file.
* sysdeps/m68k/m680x0/fpu/w_log.c: New file.
* sysdeps/mach/hurd/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
* sysdeps/x86_64/fpu/multiarch/e_log-avx.c (__ieee754_log): Rename to
__log.
* sysdeps/x86_64/fpu/multiarch/e_log-fma.c (__ieee754_log): Likewise.
* sysdeps/x86_64/fpu/multiarch/e_log-fma4.c (__ieee754_log): Likewise.
* sysdeps/x86_64/fpu/multiarch/e_log.c (__ieee754_log): Likewise.
* sysdeps/x86_64/fpu/multiarch/w_log.c: New file.
|
|
Introduce new exp and exp2 symbol version that don't do SVID compatible
error handling. The standard errno and fp exception based error handling
is inline in the new code and does not have significant overhead.
The double precision wrappers are disabled for sysdeps/ieee754/dbl-64
by using empty w_exp.c and w_exp2.c files, the math/w_exp.c and
math/w_exp2.c files use the wrapper template and can be included by
targets that have their own exp and exp2 implementations or use ifunc
on the glibc internal __ieee754_exp symbol.
The compatibility symbol versions still use the wrapper with SVID error
handling around the new code. There is no new symbol version nor
compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).
On targets where previously expl and exp2l were aliases of exp and exp2,
now they point to the compatibility symbols with the wrapper, because
they still need the SVID compatible error handling. This affects
NO_LONG_DOUBLE (e.g arm) and LONG_DOUBLE_COMPAT (e.g. alpha) targets
as well.
The _finite symbols are now aliases of the standard symbols (they have
no performance advantage anymore). Both the standard symbols and
_finite symbols set errno and thus not const functions.
The ia64 asm is changed so the compat and new symbol versions map to the
same address.
On x86_64 #include <math.h> was added before macro definitions that may
affect that header (the new macro name is __exp instead of __ieee754_exp
which breaks some math.h macros).
Tested with build-many-glibcs.py.
* math/Versions (GLIBC_2.29): Add exp and exp2.
* math/w_exp2_compat.c (__exp2_compat): Change to versioned compat
symbol, handle NO_LONG_DOUBLE and LONG_DOUBLE_COMPAT explicitly.
* math/w_exp_compat.c (__exp_compat): Likewise.
* math/w_exp.c: New file.
* math/w_exp2.c: New file.
* sysdeps/i386/fpu/w_exp.c: New file.
* sysdeps/i386/fpu/w_exp2.c: New file.
* sysdeps/ia64/fpu/e_exp.S: Add versioned symbols.
* sysdeps/ia64/fpu/e_exp2.S: Likewise.
* sysdeps/ieee754/dbl-64/e_exp.c (__ieee754_exp): Rename to __exp
and add necessary aliases.
* sysdeps/ieee754/dbl-64/e_exp2.c (__ieee754_exp2): Rename to __exp2
and add necessary aliases.
* sysdeps/ieee754/dbl-64/w_exp.c: New file.
* sysdeps/ieee754/dbl-64/w_exp2.c: New file.
* sysdeps/m68k/m680x0/fpu/w_exp.c: New file.
* sysdeps/m68k/m680x0/fpu/w_exp2.c: New file.
* sysdeps/mach/hurd/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Update.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
* sysdeps/x86_64/fpu/multiarch/e_exp-avx.c (__exp1): Remove.
(__ieee754_exp): Rename to __exp.
* sysdeps/x86_64/fpu/multiarch/e_exp-fma.c (__exp1): Remove.
(__ieee754_exp): Rename to __exp.
* sysdeps/x86_64/fpu/multiarch/e_exp-fma4.c (__exp1): Remove.
(__ieee754_exp): Rename to __exp.
* sysdeps/x86_64/fpu/multiarch/e_exp.c (__ieee754_exp): Rename to
__exp.
* sysdeps/x86_64/fpu/multiarch/w_exp.c: New file.
|
|
* malloc/malloc.c (tcache_entry): Add key field.
(tcache_put): Set it.
(tcache_get): Likewise.
(_int_free): Check for double free in tcache.
* malloc/tst-tcfree1.c: New.
* malloc/tst-tcfree2.c: New.
* malloc/Makefile: Run the new tests.
* manual/probes.texi: Document memory_tcache_double_free probe.
* dlfcn/dlerror.c (check_free): Prevent double frees.
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This fixes an ineffiency in the non-zero memset. Delaying the writeback
until the end of the loop is slightly faster on some cores - this shows
~5% performance gain on Cortex-A53 when doing large non-zero memsets.
* sysdeps/aarch64/memset.S (MEMSET): Improve non-zero memset loop.
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