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* Update copyright dates with scripts/update-copyrightsPaul Eggert2022-01-011491-1492/+1491
| | | | | | | | | | | | | | | | | | | | | | | I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
* time: Refactor timesize.h for some ABIsAdhemerval Zanella2021-12-314-11/+15
| | | | | | | | | Commit a4b413135535c83a changed default __TIMESIZE to 64, however it added sub-architecture timesize.h for powerpc, s390, and sparc. Also simplify mips by removing _MIPS_SIM usage (which would require to add sgidefs inclusion.
* open64: Force O_LARGEFILE on all architecturesStafford Horne2021-12-314-29/+4
| | | | | | | | | | | | | | | | When running tests on OpenRISC which has 32-bit wordsize but 64-bit timesize it was found that O_LARGEFILE is not being set when calling open64. For 64-bit architectures the O_LARGEFILE flag is generally implied by the kernel according to force_o_largefile. However, for 32-bit architectures this is not done. For this patch we unconditionally now set the O_LARGEFILE flag for open64 class syscalls as there is no harm in doing so. Tested on the OpenRISC the build works and timezone/tst-tzset passes which was failing before. I would expect this also would fix arc. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* x86-64: Add vector tan/tanf implementation to libmvecSunil K Pandey2021-12-301-0/+8
| | | | | | | | Implement vectorized tan/tanf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector tan/tanf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector erfc/erfcf implementation to libmvecSunil K Pandey2021-12-301-0/+8
| | | | | | | | Implement vectorized erfc/erfcf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector erfc/erfcf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector asinh/asinhf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized asinh/asinhf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector asinh/asinhf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector tanh/tanhf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized tanh/tanhf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector tanh/tanhf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector erf/erff implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized erf/erff containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector erf/erff with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector acosh/acoshf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized acosh/acoshf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector acosh/acoshf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector atanh/atanhf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized atanh/atanhf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector atanh/atanhf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector log1p/log1pf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized log1p/log1pf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector log1p/log1pf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector log2/log2f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized log2/log2f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector log2/log2f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector log10/log10f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized log10/log10f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector log10/log10f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector atan2/atan2f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized atan2/atan2f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector atan2/atan2f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector cbrt/cbrtf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized cbrt/cbrtf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector cbrt/cbrtf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector sinh/sinhf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized sinh/sinhf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector sinh/sinhf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector expm1/expm1f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized expm1/expm1f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector expm1/expm1f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector cosh/coshf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized cosh/coshf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector cosh/coshf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector exp10/exp10f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized exp10/exp10f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector exp10/exp10f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector exp2/exp2f implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized exp2/exp2f containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector exp2/exp2f with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector hypot/hypotf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized hypot/hypotf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector hypot/hypotf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector asin/asinf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized asin/asinf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector asin/asinf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Add vector atan/atanf implementation to libmvecSunil K Pandey2021-12-291-0/+8
| | | | | | | | Implement vectorized atan/atanf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector atan/atanf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf: Add _dl_find_object functionFlorian Weimer2021-12-2832-0/+32
| | | | | | | | | | | | | | | | | | | | | | | | | It can be used to speed up the libgcc unwinder, and the internal _dl_find_dso_for_object function (which is used for caller identification in dlopen and related functions, and in dladdr). _dl_find_object is in the internal namespace due to bug 28503. If libgcc switches to _dl_find_object, this namespace issue will be fixed. It is located in libc for two reasons: it is necessary to forward the call to the static libc after static dlopen, and there is a link ordering issue with -static-libgcc and libgcc_eh.a because libc.so is not a linker script that includes ld.so in the glibc build tree (so that GCC's internal -lc after libgcc_eh.a does not pick up ld.so). It is necessary to do the i386 customization in the sysdeps/x86/bits/dl_find_object.h header shared with x86-64 because otherwise, multilib installations are broken. The implementation uses software transactional memory, as suggested by Torvald Riegel. Two copies of the supporting data structures are used, also achieving full async-signal-safety. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* malloc: Remove memusage.hAdhemerval Zanella2021-12-281-0/+29
| | | | | | And use machine-sp.h instead. The Linux implementation is based on already provided CURRENT_STACK_FRAME (used on nptl code) and STACK_GROWS_UPWARD is replaced with _STACK_GROWS_UP.
* Remove atomic-machine.h atomic typedefsAdhemerval Zanella2021-12-285-81/+0
| | | | Now that memusage.c uses generic types we can remove them.
* microblaze: Add missing implementation when !__ASSUME_TIME64_SYSCALLSThomas Petazzoni2021-12-281-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit a92f4e6299fe0e3cb6f77e79de00817aece501ce ("linux: Add time64 pselect support"), a Microblaze specific implementation of __pselect32() was added to cover the case of kernels < 3.15 which lack the pselect6 system call. This new file sysdeps/unix/sysv/linux/microblaze/pselect32.c takes precedence over the default implementation sysdeps/unix/sysv/linux/pselect32.c. However sysdeps/unix/sysv/linux/pselect32.c provides an implementation of __pselect32() which is needed when __ASSUME_TIME64_SYSCALLS is not defined. On Microblaze, which is a 32-bit architecture, __ASSUME_TIME64_SYSCALLS is only true for kernels >= 5.1. Due to sysdeps/unix/sysv/linux/microblaze/pselect32.c taking precedence over sysdeps/unix/sysv/linux/pselect32.c, it means that when we are with a kernel >= 3.15 but < 5.1, we need a __pselect32() implementation, but sysdeps/unix/sysv/linux/microblaze/pselect32.c doesn't provide it, and sysdeps/unix/sysv/linux/pselect32.c which would provide it is not compiled in. This causes the following build failure on Microblaze with for example Linux kernel headers 4.9: [...]/build/libc_pic.os: in function `__pselect64': (.text+0x120b44): undefined reference to `__pselect32' collect2: error: ld returned 1 exit status Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Set default __TIMESIZE default to 64Adhemerval Zanella2021-12-2312-12/+195
| | | | This is expected size for newer ABIs.
* x86-64: Add vector acos/acosf implementation to libmvecSunil K Pandey2021-12-221-0/+8
| | | | | | | | Implement vectorized acos/acosf containing SSE, AVX, AVX2 and AVX512 versions for libmvec as per vector ABI. It also contains accuracy and ABI tests for vector acos/acosf with regenerated ulps. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* Linux: Fix 32-bit vDSO for clock_gettime on powerpc32maminjie2021-12-211-1/+1
| | | | | | | | | | | | | | When the clock_id is CLOCK_PROCESS_CPUTIME_ID or CLOCK_THREAD_CPUTIME_ID, on the 5.10 kernel powerpc 32-bit, the 32-bit vDSO is executed successfully ( because the __kernel_clock_gettime in arch/powerpc/kernel/vdso32/gettimeofday.S does not support these two IDs, the 32-bit time_t syscall will be used), but tp32.tv_sec is equal to 0, causing the 64-bit time_t syscall to continue to be used, resulting in two system calls. Fix commit 72e84d1db22203e01a43268de71ea8669eca2863. Signed-off-by: maminjie <maminjie2@huawei.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Add ARPHRD_CAN, ARPHRD_MCTP to net/if_arp.hJoseph Myers2021-12-201-0/+2
| | | | | | | | | Add the constant ARPHRD_MCTP, from Linux 5.15, to net/if_arp.h, along with ARPHRD_CAN which was added to Linux in version 2.6.25 (commit cd05acfe65ed2cf2db683fa9a6adb8d35635263b, "[CAN]: Allocate protocol numbers for PF_CAN") but apparently missed for glibc at the time. Tested for x86_64.
* riscv: align stack in clone [BZ #28702]Aurelien Jarno2021-12-171-0/+3
| | | | | | | | | | | | The RISC-V ABI [1] mandates that "the stack pointer shall be aligned to a 128-bit boundary upon procedure entry". This as not the case in clone. This fixes the misc/tst-misalign-clone-internal and misc/tst-misalign-clone tests. Fixes bug 28702. [1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc
* powerpc64[le]: Allocate extra stack frame on syscall.SMatheus Castanho2021-12-171-0/+4
| | | | | | | | | | | | | The syscall function does not allocate the extra stack frame for scv like other assembly syscalls using DO_CALL_SCV. So after commit d120fb9941 changed the offset that is used to save LR, syscall ended up using an invalid offset, causing regressions on powerpc64. So make sure the extra stack frame is allocated in syscall.S as well to make it consistent with other uses of DO_CALL_SCV and avoid similar issues in the future. Tested on powerpc, powerpc64, and powerpc64le (with and without scv) Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
* arm: Guard ucontext _rtld_global_ro access by SHARED, not PIC macroFlorian Weimer2021-12-172-4/+4
| | | | | | | | | | | | | | | | Due to PIE-by-default, PIC is now defined in more cases. libc.a does not have _rtld_global_ro, and statically linking setcontext fails. SHARED is the right condition to use, so that libc.a references _dl_hwcap instead of _rtld_global_ro. For static PIE support, the !SHARED case would still have to be made PIC. This patch does not achieve that. Fixes commit 23645707f12f2dd9d80b51effb2d9618a7b65565 ("Replace --enable-static-pie with --disable-default-pie"). Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* malloc: Add Huge Page support for mmapAdhemerval Zanella2021-12-151-0/+127
| | | | | | | | | | | | | | | | | | | | | | | | | | | | With the morecore hook removed, there is not easy way to provide huge pages support on with glibc allocator without resorting to transparent huge pages. And some users and programs do prefer to use the huge pages directly instead of THP for multiple reasons: no splitting, re-merging by the VM, no TLB shootdowns for running processes, fast allocation from the reserve pool, no competition with the rest of the processes unlike THP, no swapping all, etc. This patch extends the 'glibc.malloc.hugetlb' tunable: the value '2' means to use huge pages directly with the system default size, while a positive value means and specific page size that is matched against the supported ones by the system. Currently only memory allocated on sysmalloc() is handled, the arenas still uses the default system page size. To test is a new rule is added tests-malloc-hugetlb2, which run the addes tests with the required GLIBC_TUNABLE setting. On systems without a reserved huge pages pool, is just stress the mmap(MAP_HUGETLB) allocation failure. To improve test coverage it is required to create a pool with some allocated pages. Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>
* malloc: Add madvise support for Transparent Huge PagesAdhemerval Zanella2021-12-151-0/+74
| | | | | | | | | | | | | | | | | | | | | | | | | | Linux Transparent Huge Pages (THP) current supports three different states: 'never', 'madvise', and 'always'. The 'never' is self-explanatory and 'always' will enable THP for all anonymous pages. However, 'madvise' is still the default for some system and for such case THP will be only used if the memory range is explicity advertise by the program through a madvise(MADV_HUGEPAGE) call. To enable it a new tunable is provided, 'glibc.malloc.hugetlb', where setting to a value diffent than 0 enables the madvise call. This patch issues the madvise(MADV_HUGEPAGE) call after a successful mmap() call at sysmalloc() with sizes larger than the default huge page size. The madvise() call is disable is system does not support THP or if it has the mode set to "never" and on Linux only support one page size for THP, even if the architecture supports multiple sizes. To test is a new rule is added tests-malloc-hugetlb1, which run the addes tests with the required GLIBC_TUNABLE setting. Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>
* math: Remove the error handling wrapper from hypot and hypotfAdhemerval Zanella2021-12-1325-0/+50
| | | | | | | | | | | | The error handling is moved to sysdeps/ieee754 version with no SVID support. 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). Only ia64 is unchanged, since it still uses the arch specific __libm_error_region on its implementation. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
* x86-64: Remove LD_PREFER_MAP_32BIT_EXEC support [BZ #28656]H.J. Lu2021-12-102-87/+0
| | | | | | | | | | Remove the LD_PREFER_MAP_32BIT_EXEC environment variable support since the first PT_LOAD segment is no longer executable due to defaulting to -z separate-code. This fixes [BZ #28656]. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* nptl: Add public rseq symbols and <sys/rseq.h>Florian Weimer2021-12-0935-4/+123
| | | | | | | | | | | | | The relationship between the thread pointer and the rseq area is made explicit. The constant offset can be used by JIT compilers to optimize rseq access (e.g., for really fast sched_getcpu). Extensibility is provided through __rseq_size and __rseq_flags. (In the future, the kernel could request a different rseq size via the auxiliary vector.) Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* nptl: Add glibc.pthread.rseq tunable to control rseq registrationFlorian Weimer2021-12-093-7/+109
| | | | | | | | This tunable allows applications to register the rseq area instead of glibc. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Linux: Use rseq to accelerate sched_getcpuFlorian Weimer2021-12-091-2/+17
| | | | | Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* nptl: Add rseq registrationFlorian Weimer2021-12-0913-1/+929
| | | | | | | | | | | | The rseq area is placed directly into struct pthread. rseq registration failure is not treated as an error, so it is possible that threads run with inconsistent registration status. <sys/rseq.h> is not yet installed as a public header. Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Add generic ioctl implementationAdhemerval Zanella2021-12-063-31/+85
| | | | The powerpc is refactor to use the default implementation.
* linux: Add generic syscall implementationAdhemerval Zanella2021-12-063-67/+45
| | | | | It allows also to remove hppa specific implementation and simplify riscv implementation a bit.
* elf: execve statically linked programs instead of crashing [BZ #28648]Florian Weimer2021-12-051-0/+25
| | | | | | | | | | | | | | | Programs without dynamic dependencies and without a program interpreter are now run via execve. Previously, the dynamic linker either crashed while attempting to read a non-existing dynamic segment (looking for DT_AUDIT/DT_DEPAUDIT data), or the self-relocated in the static PIE executable crashed because the outer dynamic linker had already applied RELRO protection. <dl-execve.h> is needed because execve is not available in the dynamic loader on Hurd. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* linux: Implement pipe in terms of __NR_pipe2Adhemerval Zanella2021-11-308-160/+3
| | | | | | | | | The syscall pipe2 was added in linux 2.6.27 and glibc requires linux 3.2.0. The patch removes the arch-specific implementation for alpha, ia64, mips, sh, and sparc which requires a different kernel ABI than the usual one. Checked on x86_64-linux-gnu and with a build for the affected ABIs.
* linux: Implement mremap in CAdhemerval Zanella2021-11-303-1/+42
| | | | | | | | | Variadic function calls in syscalls.list does not work for all ABIs (for instance where the argument are passed on the stack instead of registers) and might have underlying issues depending of the variadic type (for instance if a 64-bit argument is used). Checked on x86_64-linux-gnu.
* linux: Add prlimit64 C implementationAdhemerval Zanella2021-11-3018-27/+47
| | | | | | | | | | | The LFS prlimit64 requires a arch-specific implementation in syscalls.list. Instead add a generic one that handles the required symbol alias for __RLIM_T_MATCHES_RLIM64_T. HPPA is the only outlier which requires a different default symbol. Checked on x86_64-linux-gnu and with build for the affected ABIs.
* linux: Use /proc/stat fallback for __get_nprocs_conf (BZ #28624)Adhemerval Zanella2021-11-251-25/+35
| | | | | | | The /proc/statm fallback was removed by f13fb81ad3159 if sysfs is not available, reinstate it. Checked on x86_64-linux-gnu.
* linux: Add fanotify_mark C implementationAdhemerval Zanella2021-11-2518-22/+42
| | | | | | | | | Passing 64-bit arguments on syscalls.list is tricky: it requires to reimplement the expected kernel abi in each architecture. This is way to better to represent in C code where we already have macros for this (SYSCALL_LL64). Checked on x86_64-linux-gnu.
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-03 22:19:52 +0000