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* x86: Detect Extended Feature Disable (XFD)H.J. Lu2020-07-062-0/+4
| | | | | | | An extension called extended feature disable (XFD) is an extension added for Intel AMX to the XSAVE feature set that allows an operating system to enable a feature while preventing specific user threads from using the feature.
* x86: Correct bit_cpu_CLFSH [BZ #26208]H.J. Lu2020-07-061-1/+1
| | | | bit_cpu_CLFSH should be (1u << 19), not (1u << 20).
* manual: Document __libc_single_threadedFlorian Weimer2020-07-061-0/+113
| | | | | Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: DJ Delorie <dj@redhat.com>
* Add the __libc_single_threaded variableFlorian Weimer2020-07-0651-8/+663
| | | | | | | | | | | | | | The variable is placed in libc.so, and it can be true only in an outer libc, not libcs loaded via dlmopen or static dlopen. Since thread creation from inner namespaces does not work, pthread_create can update __libc_single_threaded directly. Using __libc_early_init and its initial flag, implementation of this variable is very straightforward. A future version may reset the flag during fork (but not in an inner namespace), or after joining all threads except one. Reviewed-by: DJ Delorie <dj@redhat.com>
* Linux: rseq registration testsMathieu Desnoyers2020-07-064-1/+388
| | | | | | | | | | | | | | | These tests validate that rseq is registered from various execution contexts (main thread, destructor, other threads, other threads created from destructor, forked process (without exec), pthread_atfork handlers, pthread setspecific destructors, signal handlers, atexit handlers). tst-rseq.c only links against libc.so, testing registration of rseq in a non-multithreaded environment. tst-rseq-nptl.c also links against libpthread.so, testing registration of rseq in a multithreaded environment. See the Linux kernel selftests for extensive rseq stress-tests.
* Linux: Use rseq in sched_getcpu if availableMathieu Desnoyers2020-07-061-2/+20
| | | | | | | | | | | | | When available, use the cpu_id field from __rseq_abi on Linux to implement sched_getcpu(). Fall-back on the vgetcpu vDSO if unavailable. Benchmarks: x86-64: Intel E5-2630 v3@2.40GHz, 16-core, hyperthreading glibc sched_getcpu(): 13.7 ns (baseline) glibc sched_getcpu() using rseq: 2.5 ns (speedup: 5.5x) inline load cpuid from __rseq_abi TLS: 0.8 ns (speedup: 17.1x)
* Linux: Perform rseq registration at C startup and thread creationMathieu Desnoyers2020-07-0648-3/+781
| | | | | | | | | | | | | | | | | | | Register rseq TLS for each thread (including main), and unregister for each thread (excluding main). "rseq" stands for Restartable Sequences. See the rseq(2) man page proposed here: https://lkml.org/lkml/2018/9/19/647 Those are based on glibc master branch commit 3ee1e0ec5c. The rseq system call was merged into Linux 4.18. The TLS_STATIC_SURPLUS define is increased to leave additional room for dlopen'd initial-exec TLS, which keeps elf/tst-auditmany working. The increase (76 bytes) is larger than 32 bytes because it has not been increased in quite a while. The cost in terms of additional TLS storage is quite significant, but it will also obscure some initial-exec-related dlopen failures.
* tst-cancel4: deal with ENOSYS errorsSamuel Thibault2020-07-051-4/+38
| | | | | | | | | | The Hurd port doesn't have support for sigwaitinfo, sigtimedwait, and msgget yet, so let us ignore the test for these when they return ENOSYS. * nptl/tst-cancel4.c (tf_sigwaitinfo): Fallback on sigwait when sigwaitinfo returns ENOSYS. (tf_sigtimedwait): Likewise with sigtimedwait. (tf_msgrcv, tf_msgsnd): Fallback on tf_usleep when msgget returns ENOSYS.
* manual: Show copyright information not just in the printed manualFlorian Weimer2020-07-031-9/+11
| | | | | | | | | | | | | | | @insertcopying was not used at all in the Info and HTML versions. As a result, the notices that need to be present according to the GNU Free Documentation License were missing. This commit shows these notices above the table of contents in the HTML version, and as part of the Main Menu node in the Info version. Remove the "This file documents" line because it is redundant with the following line. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Fix typo in comment in bug 26137 fix.Joseph Myers2020-07-011-1/+1
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* Fix strtod multiple-precision division bug (bug 26137).Joseph Myers2020-06-303-2/+3577
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Bug 26137 reports spurious "inexact" exceptions from strtod, on 32-bit systems only, for a decimal argument that is exactly 1 + 2^-32. In fact the same issue also appears for 1 + 2^-64 and 1 + 2^-96 as arguments to strtof128 on 32-bit systems, and 1 + 2^-64 as an argument to strtof128 on 64-bit systems. In FE_DOWNWARD or FE_TOWARDZERO mode, the return value is also incorrect. The problem is in the multiple-precision division logic used in the case of dividing by a denominator that occupies at least three GMP limbs. There was a comment "The division does not work if the upper limb of the two-limb mumerator is greater than the denominator.", but in fact there were problems for the case of equality (that is, where the high limbs are equal, offset by some multiple of the GMP limb size) as well. In such cases, the code used "quot = ~(mp_limb_t) 0;" (with subsequent correction if that is an overestimate), because udiv_qrnnd does not support the case of equality, but it's possible for the shifted numerator to be greater than or equal to the denominator, in which case that is an underestimate. To avoid that, this patch changes the ">" condition to ">=", meaning the first division is done with a zero high word. The tests added are all 1 + 2^-n for n from 1 to 113 except for those that were already present in tst-strtod-round-data. Tested for x86_64 and x86.
* Linux: Fix UTC offset setting in settimeofday for __TIMESIZE != 64Florian Weimer2020-06-301-3/+8
| | | | | | | | | | The time argument is NULL in this case, and attempt to convert it leads to a null pointer dereference. This fixes commit d2e3b697da2433c08702f95c76458c51545c3df1 ("y2038: linux: Provide __settimeofday64 implementation"). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* random: range is not portably RAND_MAX [BZ #7003]John Marshall2020-06-301-1/+1
| | | | | | | On other platforms, RAND_MAX (which is the range of rand(3)) may differ from 2^31-1 (which is the range of random(3)). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Update kernel version to 5.7 in tst-mman-consts.py.Joseph Myers2020-06-291-1/+1
| | | | | | | | | This patch updates the kernel version in the test tst-mman-consts.py to 5.7. (There are no new constants covered by this test in 5.7 that need any other header changes; there's a new MREMAP_DONTUNMAP, but this test doesn't yet cover MREMAP_*.) Tested with build-many-glibcs.py.
* powerpc: Add support for POWER10Tulio Magno Quites Machado Filho2020-06-2914-3/+26
| | | | | | | | 1. Add the directories to hold POWER10 files. 2. Add support to select POWER10 libraries based on AT_PLATFORM. 3. Let submachine=power10 be set automatically.
* hurd: Simplify usleep timeout computationSamuel Thibault2020-06-291-5/+2
| | | | | | as suggested by Andreas Schwab * sysdeps/mach/usleep.c (usleep): Divide timeout in an overflow-safe way.
* htl: Enable cancel*16 an cancel*20 testsSamuel Thibault2020-06-297-11/+11
| | | | | | | | | | * nptl/tst-cancel16.c, tst-cancel20.c, tst-cancelx16.c, tst-cancelx20.c: Move to... * sysdeps/pthread: ... here. * nptl/Makefile: Move corresponding references and rules to... * sysdeps/pthread/Makefile: ... here. * sysdeps/mach/hurd/i386/Makefile: Xfail tst-cancel*16 for now: missing barrier pshared support, but test should be working otherwise.
* hurd: Add remaining cancelation pointsSamuel Thibault2020-06-2812-8/+72
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * hurd/hurdselect.c: Include <sysdep-cancel.h>. (_hurd_select): Surround call to __mach_msg with enabling async cancel. * sysdeps/mach/hurd/accept4.c: Include <sysdep-cancel.h>. (__libc_accept4): Surround call to __socket_accept with enabling async cancel, and use HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/connect.c: Include <sysdep-cancel.h>. (__connect): Surround call to __file_name_lookup and __socket_connect with enabling async cancel, and use HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/fdatasync.c: Include <sysdep-cancel.h>. (fdatasync): Surround call to __file_sync with enabling async cancel, and use HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/fsync.c: Include <sysdep-cancel.h>. (fsync): Surround call to __file_sync with enabling async cancel, and use HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/ioctl.c: Include <sysdep-cancel.h>. (__ioctl): When request is TIOCDRAIN, surround call to send_rpc with enabling async cancel, and use HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/msync.c: Include <sysdep-cancel.h>. (msync): Surround call to __vm_object_sync with enabling async cancel. * sysdeps/mach/hurd/sigsuspend.c: Include <sysdep-cancel.h>. (__sigsuspend): Surround call to __mach_msg with enabling async cancel. * sysdeps/mach/hurd/sigwait.c: Include <sysdep-cancel.h>. (__sigwait): Surround wait code with enabling async cancel. * sysdeps/mach/msync.c: Include <sysdep-cancel.h>. (msync): Surround call to __vm_msync with enabling async cancel. * sysdeps/mach/sleep.c: Include <sysdep-cancel.h>. (__sleep): Surround call to __mach_msg with enabling async cancel. * sysdeps/mach/usleep.c: Include <sysdep-cancel.h>. (usleep): Surround call to __vm_msync with enabling async cancel.
* hurd: fix usleep(ULONG_MAX)Samuel Thibault2020-06-281-1/+5
| | | | * sysdeps/mach/usleep.c (usleep): Clamp timeout when rouding up.
* hurd: Make fcntl(F_SETLKW*) cancellation pointsSamuel Thibault2020-06-284-8/+44
| | | | | | | | | | | | | and add _nocancel variant. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add fcntl_nocancel. * sysdeps/mach/hurd/fcntl.c [NOCANCEL]: Include <not-cancel.h>. [!NOCANCEL]: Include <sysdep-cancel.h>. (__libc_fcntl) [!NOCANCEL]: Surround __file_record_lock call with enabling async cancel, and use HURD_FD_PORT_USE_CANCEL instead of HURD_FD_PORT_USE. * sysdeps/mach/hurd/fcntl_nocancel.c: New file, defines __fcntl_nocancel by including fcntl.c. * sysdeps/mach/hurd/not-cancel.h (__fcntl64_nocancel): Replace macro with __fcntl_nocancel declaration with hidden proto, and make __fcntl64_nocancel call __fcntl_nocancel.
* hurd: make wait4 a cancellation pointSamuel Thibault2020-06-284-6/+70
| | | | | | | | | | | | | | and add _nocancel variant. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add wait4_nocancel. * sysdeps/mach/hurd/wait4.c: Include <sysdep-cancel.h> (__wait4): Surround __proc_wait with enabling async cancel, and use __USEPORT_CANCEL instead of __USEPORT. * sysdeps/mach/hurd/wait4_nocancel.c: New file, contains previous implementation of __wait4. * sysdeps/mach/hurd/not-cancel.h (__waitpid_nocancel): Replace macro with __wait4_nocancel declaration with hidden proto, and make __waitpid_nocancel call __wait4_nocancel.
* hurd: Fix port definition in HURD_PORT_USE_CANCELSamuel Thibault2020-06-281-0/+3
| | | | | * sysdeps/hurd/include/hurd/port.h: Include <libc-lock.h>. (HURD_PORT_USE_CANCEL): Add local port variable.
* hurd: make close a cancellation pointSamuel Thibault2020-06-287-6/+50
| | | | | | | | | | | | | | and add _nocancel variant. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add close_nocancel. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE, ld.GLIBC_PRIVATE): Add __close_nocancel. * sysdeps/mach/hurd/i386/localplt.data (__close_nocancel): Allow PLT. * sysdeps/mach/hurd/close.c: Include <sysdep-cancel.h> (__libc_close): Surround _hurd_fd_close with enabling async cancel. * sysdeps/mach/hurd/close_nocancel.c: New file. * sysdeps/mach/hurd/not-cancel.h (__close_nocancel): Replace macro with declaration with hidden proto.
* hurd: make open and openat cancellation pointsSamuel Thibault2020-06-289-10/+138
| | | | | | | | | | | | | | | | | | | | | and add _nocancel variants. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add open_nocancel openat_nocancel. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE, ld.GLIBC_PRIVATE): Add __open_nocancel. * sysdeps/mach/hurd/dl-sysdep.c (__open_nocancel): Add alias, check it is not hidden. * sysdeps/mach/hurd/i386/localplt.data (__open_nocancel): Allow PLT. * sysdeps/mach/hurd/not-cancel.h (__open_nocancel, __openat_nocancel: Replace macros with declarations with hidden proto. (__open64_nocancel, __openat64_nocancel): Call __open_nocancel and __openat_nocancel instead of __open64 and __openat64. * sysdeps/mach/hurd/open.c: Include <sysdep-cancel.h> (__libc_open): Surround __file_name_lookup with enabling async cancel. * sysdeps/mach/hurd/openat.c: Likewise. * sysdeps/mach/hurd/open_nocancel.c, sysdeps/mach/hurd/openat_nocancel.c: New files.
* hurd: clean fd and port on thread cancelSamuel Thibault2020-06-2817-28/+146
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | HURD_*PORT_USE link fd and port with a stack-stored structure, so on thread cancel we need to cleanup this. * hurd/fd-cleanup.c: New file. * hurd/port-cleanup.c (_hurd_port_use_cleanup): New function. * hurd/Makefile (routines): Add fd-cleanup. * sysdeps/hurd/include/hurd.h (__USEPORT_CANCEL): New macro. * sysdeps/hurd/include/hurd/fd.h (_hurd_fd_port_use_data): New structure. (_hurd_fd_port_use_cleanup): New prototype. (HURD_DPORT_USE_CANCEL, HURD_FD_PORT_USE_CANCEL): New macros. * sysdeps/hurd/include/hurd/port.h (_hurd_port_use_data): New structure. (_hurd_port_use_cleanup): New prototype. (HURD_PORT_USE_CANCEL): New macro. * hurd/hurd/fd.h (HURD_FD_PORT_USE): Also refer to HURD_FD_PORT_USE_CANCEL. * hurd/hurd.h (__USEPORT): Also refer to __USEPORT_CANCEL. * hurd/hurd/port.h (HURD_PORT_USE): Also refer to HURD_PORT_USE_CANCEL. * hurd/fd-read.c (_hurd_fd_read): Call HURD_FD_PORT_USE_CANCEL instead of HURD_FD_PORT_USE. * hurd/fd-write.c (_hurd_fd_write): Likewise. * sysdeps/mach/hurd/send.c (__send): Call HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE. * sysdeps/mach/hurd/sendmsg.c (__libc_sendmsg): Likewise. * sysdeps/mach/hurd/sendto.c (__sendto): Likewise. * sysdeps/mach/hurd/recv.c (__recv): Likewise. * sysdeps/mach/hurd/recvfrom.c (__recvfrom): Likewise. * sysdeps/mach/hurd/recvmsg.c (__libc_recvmsg): Call __USEPORT_CANCEL instead of __USEPORT, and HURD_DPORT_USE_CANCEL instead of HURD_DPORT_USE.
* htl: Move cleanup handling to non-private libc-lockSamuel Thibault2020-06-282-33/+70
| | | | | | | | | | | | | | | | | This adds sysdeps/htl/libc-lock.h which augments sysdeps/mach/libc-lock.h with the htl-aware cleanup handling. Otherwise inclusion of libc-lock.h without libc-lockP.h would keep only the mach-aware handling. This also fixes cleanup getting called when the binary is statically-linked without libpthread. * sysdeps/htl/libc-lockP.h (__libc_cleanup_region_start, __libc_cleanup_end, __libc_cleanup_region_end, __pthread_get_cleanup_stack): Move to... * sysdeps/htl/libc-lock.h: ... new file. (__libc_cleanup_region_start): Always set handler and arg. (__libc_cleanup_end): Always call the cleanup handler. (__libc_cleanup_push, __libc_cleanup_pop): New macros.
* htl: Fix includes for lockfileSamuel Thibault2020-06-283-6/+3
| | | | | | | | | | | These only need exactly to use __libc_ptf_call. * sysdeps/htl/flockfile.c: Include <libc-lockP.h> instead of <libc-lock.h> * sysdeps/htl/ftrylockfile.c: Include <libc-lockP.h> instead of <errno.h>, <pthread.h>, <stdio-lock.h> * sysdeps/htl/funlockfile.c: Include <libc-lockP.h> instead of <pthread.h> and <stdio-lock.h>
* htl: avoid cancelling threads inside critical sectionsSamuel Thibault2020-06-271-0/+9
| | | | | | | | Like hurd_thread_cancel does. * sysdeps/mach/hurd/htl/pt-docancel.c: Include <hurd/signal.h> (__pthread_do_cancel): Lock target thread's critical_section_lock and ss lock around thread mangling.
* tst-cancel4-common.c: fix calling socketpairSamuel Thibault2020-06-261-1/+1
| | | | | | | | | | | PF_UNIX was actually never intended to be passed as protocol parameter to socket() calls: it is a protocol family, not a protocol. It happens that Linux introduced accepting it during its 2.0 development, but it shouldn't. OpenBSD kernels accept it as well, but FreeBSD and NetBSD rightfully do not. GNU/Hurd does not either. * nptl/tst-cancel4-common.c (do_test): Pass 0 instead of PF_UNIX as protocol.
* x86: Detect Intel Advanced Matrix ExtensionsH.J. Lu2020-06-263-0/+44
| | | | | | | | | | | | | | Intel Advanced Matrix Extensions (Intel AMX) is a new programming paradigm consisting of two components: a set of 2-dimensional registers (tiles) representing sub-arrays from a larger 2-dimensional memory image, and accelerators able to operate on tiles. Intel AMX is an extensible architecture. New accelerators can be added and the existing accelerator may be enhanced to provide higher performance. The initial features are AMX-BF16, AMX-TILE and AMX-INT8, which are usable only if the operating system supports both XTILECFG state and XTILEDATA state. Add AMX-BF16, AMX-TILE and AMX-INT8 support to HAS_CPU_FEATURE and CPU_FEATURE_USABLE.
* Set width of JUNGSEONG/JONGSEONG characters from UD7B0 to UD7FB to 0 [BZ #26120]Mike FABIAN2020-06-2610-9/+18
| | | | Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* S390: Optimize __memset_z196.Stefan Liebler2020-06-261-10/+9
| | | | | | | | It turned out that an 256b-mvc instruction which depends on the result of a previous 256b-mvc instruction is counterproductive. Therefore this patch adjusts the 256b-loop by storing the first byte with stc and setting the remaining 255b with mvc. Now the 255b-mvc instruction depends on the stc instruction.
* S390: Optimize __memcpy_z196.Stefan Liebler2020-06-261-6/+15
| | | | | | This patch introduces an extra loop without pfd instructions as it turned out that the pfd instructions are usefull for copies >=64KB but are counterproductive for smaller copies.
* elf: Include <stddef.h> (for size_t), <sys/stat.h> in <ldconfig.h>Florian Weimer2020-06-251-0/+2
| | | | Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* nptl: Don't madvise user provided stackSzabolcs Nagy2020-06-251-2/+3
| | | | | | | | | | | | | | | User provided stack should not be released nor madvised at thread exit because it's owned by the user. If the memory is shared or file based then MADV_DONTNEED can have unwanted effects. With memory tagging on aarch64 linux the tags are dropped and thus it may invalidate pointers. Tested on aarch64-linux-gnu with MTE, it fixes FAIL: nptl/tst-stack3 FAIL: nptl/tst-stack3-mem
* S390: Regenerate ULPs.Stefan Liebler2020-06-241-0/+2
| | | | Updates needed after recent exp10f commits.
* htl: Add wrapper header for <semaphore.h> with hidden __sem_postFlorian Weimer2020-06-243-2/+11
| | | | | | | This is required to avoid a check-localplt failure due to a sem_post call through the PLT. Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
* elf: Include <stdbool.h> in <dl-tunables.h> because bool is usedFlorian Weimer2020-06-241-0/+2
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* htl: Fix case when sem_*wait is canceled while holding a tokenSamuel Thibault2020-06-241-2/+13
| | | | | | | | * sysdeps/htl/sem-timedwait.c (struct cancel_ctx): Add cancel_wake field. (cancel_hook): When unblocking thread, set cancel_wake field to 1. (__sem_timedwait_internal): Set cancel_wake field to 0 by default. On cancellation exit, check whether we hold a token, to be put back.
* htl: Make sem_*wait cancellations pointsSamuel Thibault2020-06-245-15/+90
| | | | | | | | | | | | | | By aligning its implementation on pthread_cond_wait. * sysdeps/htl/sem-timedwait.c (cancel_ctx): New structure. (cancel_hook): New function. (__sem_timedwait_internal): Check for cancellation and register cancellation hook that wakes the thread up, and check again for cancellation on exit. * nptl/tst-cancel13.c, nptl/tst-cancelx13.c: Move to... * sysdeps/pthread/: ... here. * nptl/Makefile: Move corresponding references and rules to... * sysdeps/pthread/Makefile: ... here.
* htl: Simplify non-cancel path of __pthread_cond_timedwait_internalSamuel Thibault2020-06-241-20/+21
| | | | | | | | | Since __pthread_exit does not return, we do not need to indent the noncancel path * sysdeps/htl/pt-cond-timedwait.c (__pthread_cond_timedwait_internal): Move cancelled path before non-cancelled path, to avoid "else" indentation.
* htl: Enable tst-cancel25 testSamuel Thibault2020-06-243-2/+4
| | | | | | | | * nptl/tst-cancel25.c: Move to... * sysdeps/pthread/tst-cancel25.c: ... here. (tf2) Do not test for SIGCANCEL when it is not defined. * nptl/Makefile: Move corresponding reference to... * sysdeps/pthread/Makefile: ... here.
* powerpc: Add new hwcap valuesTulio Magno Quites Machado Filho2020-06-232-1/+3
| | | | | | | | | Linux commit ID ee988c11acf6f9464b7b44e9a091bf6afb3b3a49 reserved 2 new bits in AT_HWCAP2: - PPC_FEATURE2_ARCH_3_1 indicates the availability of the POWER ISA 3.1; - PPC_FEATURE2_MMA indicates the availability of the Matrix-Multiply Assist facility.
* aarch64: MTE compatible strncmpAlex Butler2020-06-231-99/+145
| | | | | | | | | | | | | Add support for MTE to strncmp. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Branislav Rankov <branislav.rankov@arm.com> Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
* aarch64: MTE compatible strcmpAlex Butler2020-06-231-109/+125
| | | | | | | | | | | | | Add support for MTE to strcmp. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Branislav Rankov <branislav.rankov@arm.com> Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
* aarch64: MTE compatible strrchrAlex Butler2020-06-231-114/+91
| | | | | | | | | | | | Add support for MTE to strrchr. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
* aarch64: MTE compatible memrchrAlex Butler2020-06-231-116/+83
| | | | | | | | | | | | Add support for MTE to memrchr. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
* aarch64: MTE compatible memchrAlex Butler2020-06-231-107/+80
| | | | | | | | | | | | Add support for MTE to memchr. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Gabor Kertesz <gabor.kertesz@arm.com>
* aarch64: MTE compatible strcpyAlex Butler2020-06-231-263/+122
| | | | | | | | | | | | Add support for MTE to strcpy. Regression tested with xcheck and benchmarked with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1. The existing implementation assumes that any access to the pages in which the string resides is safe. This assumption is not true when MTE is enabled. This patch updates the algorithm to ensure that accesses remain within the bounds of an MTE tag (16-byte chunks) and improves overall performance. Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>
* Add MREMAP_DONTUNMAP from Linux 5.7Joseph Myers2020-06-231-0/+1
| | | | | | | Add the new constant MREMAP_DONTUNMAP from Linux 5.7 to bits/mman-shared.h. Tested with build-many-glibcs.py.
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